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Preprint ARTICLE | doi:10.20944/preprints202106.0136.v1

An Improved Droop Control Strategy for Grid-connected Inverter Power Stability and Harmonic Suppression Under Grid Fluctuation and Inter-harmonics

Wanwan Xu, Bin Wang, Jiang Liu, Da Li

Subject: Engineering, Automotive Engineering Keywords: Droop control; micro-grid inverter; grid-connected mode; instantaneous frequency detection; incomplete derivation

Online: 4 June 2021 (10:48:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.0657.v1

Microstructure and Tensile Performance of Iron-Reinforced Polylactic Acid Composite Manufactured Using Fused Filament Fabrication

Sofiane Guessasma, Sofiane Belhabib

Subject: Engineering, Mechanical Engineering Keywords: Fused filament fabrication; PLA-iron composite; tensile performance; X-ray micro-tomography

Online: 9 January 2024 (05:19:29 CET)

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Preprint ARTICLE | doi:10.20944/preprints202306.0877.v1

Investigating Possible Correlations Between Gamma-Ray and Optical Lightcurves for TeV-Detected Northern Blazars Over 8 Years of Observations

Atreya Acharyya, Alberto Sadun

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: BL Lacertae objects; general – galaxies; active – galaxies; jets – quasars; general

Online: 13 June 2023 (04:56:09 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0227.v1

[¹⁸F]FDG PET/CT in Short-Term Complications of COVID-19: Metabolic Markers of Persistent Inflammation and Impaired Respiratory Function

Eva María Triviño-Ibáñez, Beatriz María Jiménez-Rodríguez, Teodoro Rudolphi-Solero, Encarnación Yolanda García-Rivero, Antonio Rodríguez-Fernández, Jose Manuel Llamas-Elvira, Manuel Gómez-Río, Concepción Morales-García

Subject: Medicine And Pharmacology, Pulmonary And Respiratory Medicine Keywords: COVID-19; FDG-PET/CT; respiratory function test; complications; inflammatory; SARS-CoV-2

Online: 16 March 2022 (09:26:16 CET)

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Preprint ARTICLE | doi:10.20944/preprints202006.0031.v3

A Fully Automated Deep Learning-based Network For Detecting COVID-19 from a New And Large Lung CT Scan Dataset

Mohammad Rahimzadeh, Abolfazl Attar, Seyed Mohammad Sakhaei

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: Deep learning; Convolutional Neural Network; Coronavirus; COVID-19; radiology; CT scan; Medical image analysis; Automatic medical diagnosis; lung CT scan dataset

Online: 5 September 2020 (03:36:20 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202005.0052.v1

Social-Group-Optimization Assisted Kapur’s Entropy and Morphological Segmentation for Automated Detection of COVID-19 Infection from Computed Tomography Images

Nilanjan Dey, V. Rajinikant, Simon James Fong, M. Shamim Kaiser, Mufti Mahmud

Subject: Computer Science And Mathematics, Computer Vision And Graphics Keywords: COVID-19 infection; CT scan image; serial feature fusion; KNN classiﬁer; segmentation; detection accuracy

Online: 5 May 2020 (02:32:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.1205.v1

Comparative Analysis of Vascular Structures in OLIF51 and Lateral Corridor Approach under Supine MRI and Intraoperative Enhanced CT in Lateral Decubitus Position

Yoshihisa Kotani, Hiroyuki Tachi, Atsushi Ikeura, Takahiro Tanaka, Takanori Saito

Subject: Medicine And Pharmacology, Orthopedics And Sports Medicine Keywords: Vascular anatomy; Anterior lumbar fusion; OLIF51; Lateral corridor approach

Online: 16 January 2024 (07:18:37 CET)

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Background and objectives: As the oblique lateral interbody fusion at L5/S1 (OLIF51) and lateral corridor approach (LCA) have gained popularity, the understanding of precise vascular structure at L5/S1 level is indispensable. The objectives of this study were to investigate the vascular anatomy at L5/S1 level, and to compare the movement of vascular tissue between supine and lateral decubitus position using the intraoperative enhanced CT and MRI. Materials and Methods: A total of 43 patients who underwent either OLIF51 or LCA were investigated with the average age at surgery of 60.4 (37-80) years old. The preoperative MRI was taken to observe axial and sagittal anatomy of vascular position under supine position. The intraoperative vein-enhanced CT was taken just before incision in the right decubitus position, and compared to supine MRI anatomy. The iliolumbar vein appearance and its types were also classified. Results: The average vascular window allowed for OLIF51 was 22.8 mm and 34.1 mm at either L5 caudal endplate or S1 cephalad endplate level, respectively. It allowed for LCA was 14.2 mm and 12.6 mm at either level, respectively. The left common iliac vein moved 3.8 mm and 6.9 mm to right direction at either level from supine to right decubitus position, respectively. The bifurcation moved 6.3 mm to caudal direction from supine to right decubitus. The iliolumbar vein was located at 31 mm lateral from midline, and MRI detection rate was 52%. Conclusions: The precise measurement of vascular anatomy indicated that OLIF51 approach was the standard minimally invasive anterior approach for L5/S1 disc level compared to LCA, however, there were many variations in quantitative anatomy as well as significant vascular movements between supine and right decubitus position. In the clinical setting of OLIF51 and LCA surgeries, the careful preoperative evaluation and intraoperative 3D imaging are recommended for the safe and accurate surgery.

Preprint ARTICLE | doi:10.20944/preprints202409.1800.v1

Impact of the COVID-19 Pandemic on the Detection of Leprosy in Micro-Regions with a High Risk of Illness in Minas Gerais, Brazil

Sarah L Vidal, Daniele dos S. Lages, Isabela C. L. Maciel, Isabel C. G. Leite, Angélica da Conceição Oliveira Coelho, Francisco C. F. Lana

Subject: Public Health And Healthcare, Public Health And Health Services Keywords: Leprosy; Epidemiology; COVID-19 pandemic; Public Health Surveillance

Online: 24 September 2024 (09:16:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1116.v1

One-Step Electrochemical Dealloying of 3D Bi-continuous Micro-nano Porous Bismuth Electrodes and CO₂RR Performance

Wenqin Lai, Yating Liu, Mingming Zeng, Dongmei Han, Min Xiao, Shuanjin Wang, Shan Ren, Yuezhong Meng

Subject: Chemistry And Materials Science, Electrochemistry Keywords: Nanoporous; Dealloying; 3D Architectures; CO2 reduction; formate

Online: 16 May 2023 (07:18:47 CEST)

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Preprint REVIEW | doi:10.20944/preprints202104.0326.v1

PET and SPECT Imaging of Tumor Micro-Environment: A Systematic Review of the Last 20 Years

Valeria Stati, Chiara Lauri, Michela Varani, Martina Conserva, Alberto Signore

Subject: Medicine And Pharmacology, Immunology And Allergy Keywords: microenvironment; radiopharmaceuticals; treatment response; personalised medicine; Nuclear Medicine

Online: 13 April 2021 (08:29:32 CEST)

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Working Paper ARTICLE

Badging for Sustainable Development: Applying EdTech Micro-Credentials for Advancing SDGs amongst Mountain and Pastoralist Societies

Randall Gwin, Marc Foggin

Subject: Social Sciences, Education Keywords: education; skills development; online distance learning; credentials; open badges; blockchain; sustainable livelihoods; sustainable mountain development; traditional knowledge; culture; Kyrgyzstan; Central Asia

Online: 27 March 2020 (03:07:11 CET)

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Preprint ARTICLE | doi:10.20944/preprints201912.0085.v1

A Compact Micro-Bolometer Array for Mid-Infrared Laser Beam Alignment, Diagnostics and Spot-Size Measurement

Ian Clark, Michael Towrie

Subject: Physical Sciences, Applied Physics Keywords: beam profiler; bolometer; laser spot-size; infrared; infrared spectroscopy; time-resolved spectroscopy

Online: 7 December 2019 (00:11:31 CET)

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Preprint REVIEW | doi:10.20944/preprints201808.0210.v1

Applications of Oxygen-Carrying Micro/Nanobubbles: a Potential Approach to Enhance Photodynamic Therapy and Photoacoustic Imaging

M. Saad Khan, Jangsun Hwang, Kyungwoo Lee, Yonghyun Choi, Kyobum Kim, Hyung-Jun Koo, Jong Wook Hong, Jonghoon Choi

Subject: Chemistry And Materials Science, Nanotechnology Keywords: microbubbles; nanobubbles; photoacoustic imaging; ultrasonic imaging; ROS; oxygen delivery

Online: 11 August 2018 (18:49:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0041.v1

Hybrid PV-Wind Micro-Grid Development Using Quasi-Z-Source Inverter Modeling and Control –Experimental Investigation

Neeraj Priyadarshi, Sanjeevikumar Padmanaban, Dan M. Ionel, Lucian Mihet-Popa, Farooque Azam

Subject: Engineering, Electrical And Electronic Engineering Keywords: PV; MPRVS; quasi Z-source inverter; MPP; SEPIC converter

Online: 4 June 2018 (12:19:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0025.v1

Structural Assessment Based on Vibration Measurement Test Combined With an Artificial Neural Network for the Steel Truss Bridge

Minh Quang Tran, Hélder S Sousa, Thuc V Ngo, Binh Duc Nguyen, Quyền Nguyễn, Huan X Nguyen, Edward Baron, José Matos, Son Ngoc DANG

Subject: Engineering, Civil Engineering Keywords: ANN; FEM; damage assessment; structural health monitoring; steel truss bridge

Online: 1 June 2023 (04:38:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0596.v2

Feasibility of Proton Dosimetry Overriding Planning CT with Daily CBCT Elaborated through Generative Artificial Intelligence Tools

Matteo Rossi, Gabriele Belotti, Luca Mainardi, Guido Baroni, Pietro Cerveri

Subject: Engineering, Bioengineering Keywords: Deep Learning; image-to-image translation; dosimetry; cycleGAN; CBCT; CT; limited FOV; artifact correction; Hounsfield unit recovery

Online: 5 June 2023 (09:53:36 CEST)

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Radiotherapy commonly utilizes CBCT for patient positioning and treatment monitoring. CBCT is deemed to be secure for patients, making it suitable for the delivery of fractional doses. However, limitations such as a narrow field of view, beam hardening, scattered radiation artifacts, and variability in pixel intensity hinder the direct use of raw CBCT for dose recalculation during treatment. To address this issue, reliable correction techniques are necessary to remove artifacts and remap pixel intensity into HU values. This study proposes a deep-learning framework for calibrating CBCT images acquired with narrow FOV systems and demonstrates its potential use in proton treatment planning updates. Cycle-consistent GAN processes raw CBCT to reduce scatter and remap HU. Monte Carlo simulation is used to generate CBCT scans, enabling the possibility to focus solely on the algorithm’s ability to reduce artifacts and cupping effects without considering intra-patient longitudinal variability and producing a fair comparison between planning CT and calibrated CBCT dosimetry. To showcase the viability of the approach using real-world data, experiments were also conducted using real CBCT. Tests were performed on a publicly available dataset of 40 patients who received ablative radiation therapy for pancreatic cancer. The simulated CBCT calibration led to a difference in proton dosimetry of less than 2%, compared to the planning CT. The potential toxicity effect on the organs at risk decreased from about 50% (uncalibrated) up the 2% (calibrated). The gamma pass rate at 3%/2mm produced an improvement of about 37% in replicating the prescribed dose before and after calibration (53.78% vs 90.26%). Real data also confirmed this with slightly inferior performances for the same criteria (65.36% vs 87.20%). These results may confirm that generative artificial intelligence brings the use of narrow FOV CBCT scans incrementally closer to clinical translation in proton therapy planning updates.

Preprint ARTICLE | doi:10.20944/preprints202304.0156.v1

Three-Dimensional Cranio-Facial Landmark Detection in Series of CT Slices, Using Multi-Phased Regression Networks

Soh Nishimoto, Takuya Saito, Hisako Ishise, Toshihiro Fujiwara, Kenichiro Kawai, Masao Kakibuchi

Subject: Medicine And Pharmacology, Dentistry And Oral Surgery Keywords: Multi-phased deep learning; Regression neural network; Coordinate value; Computer assisted tomography (CT); Cranio-facial bone

Online: 10 April 2023 (07:59:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201912.0250.v1

Introducing the "K-Shaped Sign", A New Finding on CT to Detect Early-Stage Pancreatic Cancer

Yuko Kobashi, Junichi Matsui

Subject: Medicine And Pharmacology, Oncology And Oncogenics Keywords: fatty infiltration; main pancreatic duct dilatation; pancreatic invasive ductal adenocaricinoma

Online: 19 December 2019 (07:19:10 CET)

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Preprint ARTICLE | doi:10.20944/preprints201809.0590.v1

Are Preoperative CT Findings Useful for Predicting Postoperative Intraabdominal Abscess in the Patients with Acute Appendicitis?

Atsushi Kohga, Kiyoshige Yajima, Takuya Okumura, Kimihiro Yamashita, Jun Isogaki, Kenji Suzuki, Katsuaki Muramatsu, Akira Komiyama, Akihiro Kawabe

Subject: Medicine And Pharmacology, Gastroenterology And Hepatology Keywords: acute appendicitis; complicated appendicitis; laparoscopic appendectomy; intraabdominal abscess

Online: 29 September 2018 (10:51:00 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201701.0061.v1

Assessing Hydrological Impacts of a Watershed in the Context of Climate and Land Cover Changes

Dong-Sin Shih, Ray-Shyan Wu, Chung-Yuan Tsai

Subject: Engineering, Civil Engineering Keywords: climate change; land cover change; WASH123D

Online: 12 January 2017 (10:05:06 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0131.v1

Modeling the Grinding Process of the Cereal Grains as a Result of Friction in the Millstones

Filip Ilie, Constantin Daniel Cotici, Andrei-Florin Hristache

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: grind process; micro-scale friction; modeling; collision; surface topography

Online: 4 October 2023 (03:18:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.0811.v1

Demographic Analysis of Active Travel Users in Urban Context

Ahmed Jaber, Jamil Hamadneh

Subject: Engineering, Transportation Science And Technology Keywords: Active travel; mode choice; micro-mobility; shared mobility; walking

Online: 13 September 2023 (16:09:05 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1146.v1

Antioxidant Capacity of Mango ‘Ataulfo’ Grown in the Region of Denomination of Origin

Iris Ordoñez-Guillén, Alfredo Vázquez-Ovando, Raymundo Rosas-Quijano, Miguel Salvador-Figueroa, Didiana Gálvez-López

Subject: Chemistry And Materials Science, Food Chemistry Keywords: denomination of origin; micro-environments; parent trees; phenolic compounds

Online: 16 May 2023 (09:56:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202104.0708.v1

Rural Electrification of Somalia Using WT-PV-DG-Battery Hybrid System

Swathi Kumar, Richard Blanchard

Subject: Engineering, Automotive Engineering Keywords: Micro-grid, Rural Electrification, HOMER, Control strategy, Sensitivity analysis

Online: 27 April 2021 (12:27:25 CEST)

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Working Paper REVIEW

Review of Orthogonally Polarized RF Optical Single Sideband Generation Based on Integrated Ring Resonators

mengxi tan, xingyuan xu, David Moss

Subject: Engineering, Automotive Engineering Keywords: microcombs; microwave photonics; micro-ring resonators; RF sideband generation

Online: 10 November 2020 (11:52:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints201812.0186.v1

In-situ Mechanical Characterization of Mixed-Mode Fracture Strength of Cu/Si Interface for TSV Structures

Chenglin Wu, Congjie Wei, Yanxiao Li

Subject: Physical Sciences, Applied Physics Keywords: TSV, nanoindentation, FIB, micro-cantilever beam, mixed-mode, fracture

Online: 17 December 2018 (10:01:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints201611.0004.v1

Use of Micropatterned Thin Film Nitinol in Carotid Stents to Augment Embolic Protection

Mahdis Shayan, Brian T. Jankowitz, Puneeth Shridhar, Youngjae Chun

Subject: Chemistry And Materials Science, Materials Science And Technology Keywords: thin film nitinol; carotid artery; micro mesh stent; micropatterning

Online: 1 November 2016 (06:54:40 CET)

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Preprint ARTICLE | doi:10.20944/preprints202406.1147.v1

Boundary Segmentation of Vascular Images in Fourier Domain Doppler Optical Coherence Tomography Based on Deep Learning

Chuanchao Wu, Zhibin Wang, Peng Xue, Wenyan Liu

Subject: Computer Science And Mathematics, Data Structures, Algorithms And Complexity Keywords: Optical coherence tomography; Image segmentation; Deep learning; Microvascular anastomosis

Online: 17 June 2024 (14:36:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0261.v1

On the Potential of 3D Transdimensional Surface Wave Tomography for Geothermal Prospecting of the Reykjanes peninsula

Amin Rahimi Dalkhani, Xin Zhang, Cornelis Weemstra

Subject: Environmental And Earth Sciences, Geophysics And Geology Keywords: Seismic interferometry; Transdimensional tomography; Surface wave dispersion; probabilistic inversion; Markov chain Monte Carlo

Online: 19 October 2021 (08:23:56 CEST)

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Seismic travel time tomography using surface waves is an effective tool for three-dimensional crustal imaging. Historically, these surface waves are the result of active seismic sources or earthquakes. More recently, however, also surface waves retrieved through the application of seismic interferometry are exploited. Conventionally, two-step inversion algorithms are employed to solve the tomographic inverse problem. That is, a first inversion results in frequency-dependent, two-dimensional maps of phase velocity, which then serve as input for a series of independent, one-dimensional frequency-to-depth inversions. As such, a two-dimensional grid of localized depth-dependent velocity profiles are obtained. Stitching these separate profiles together subsequently yields a three-dimensional velocity model. Relatively recently, a one-step three-dimensional non-linear tomographic algorithm has been proposed. The algorithm is rooted in a Bayesian framework using Markov chains with reversible jumps, and is referred to as transdimensional tomography. Specifically, the three-dimensional velocity field is parameterized by means of a polyhedral Voronoi tessellation. In this study, we investigate the potential of this algorithm for the purpose of recovering the three-dimensional surface-wave-velocity structure from ambient noise recorded on and around the Reykjanes Peninsula, southwest Iceland. To that end, we design a number of synthetic tests that take into account the station configuration of the Reykjanes seismic network. We find that the algorithm is able to recover the 3D velocity structure at various scales in areas where station density is high. In addition, we find that the standard deviation on the recovered velocities is low in those regions. At the same time, the velocity structure is less well recovered in parts of the peninsula sampled by fewer stations. This implies that the algorithm successfully adapts model resolution to the density of rays. Also, it adapts model resolution to the amount of noise on the travel times. Because the algorithm is computationally demanding, we modify the algorithm such that computational costs are reduced while sufficiently preserving non-linearity. We conclude that the algorithm can now be applied adequately to travel times extracted from (time-averaged) station-station cross correlations by the Reykjanes seismic network.

Preprint ARTICLE | doi:10.20944/preprints202011.0074.v4

Synthesis, Structural Characterization, and Biological Activities of Organically Templated Cobalt Phosphite (H2DAB)[Co(H2PO3)4]·2H2O

Najlaa Hamdi, Souad Chaouch, Ivan da Silva, Mohamed Ezahri, Mohammed Lachkar, Rama Alhasan, Ahmad Yaman Abdin, Claus Jacob, Brahim El Bali

Subject: Biology And Life Sciences, Immunology And Microbiology Keywords: Hybrid phosphite; X-Ray crystal structure; FTIR; Thermal behavior; Biological activities; Antimi-crobial; micro-organisms

Online: 22 November 2021 (08:43:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202311.1782.v1

Efficiency of Micro and Small Wood-Processing Enterprises in the EU – Evidence From DEA and Fractional Regression Analysis

Nikolay Neykov, Mariana Sedliačiková, Petar Antov, Marek Potkány, Emil Kitchoukov, Aureliu-Florin Hălălișan, Natália Poláková

Subject: Business, Economics And Management, Economics Keywords: DEA; wood processing enterprises; small enterprises; fractional regression

Online: 28 November 2023 (07:49:48 CET)

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Preprint CASE REPORT | doi:10.20944/preprints202306.0678.v1

Laparoscopic Extended Left Lateral Sectionectomy for Hepatocellular Carcinoma in a Patient with Right-Sided Ligamentum Teres: Case Report and Literature Review

Yuki Adachi, Hiroyuki Takahashi, Tomohiro Yamamoto, Masahiro Hagiwara, Koji Imai, Hideki Yokoo

Subject: Medicine And Pharmacology, Gastroenterology And Hepatology Keywords: Right-sided ligamentum teres; Three-dimensional computed tomography; Intraoperative ultrasonography; Laparoscopic hepatectomy; Expanded left lateral sectionectomy

Online: 9 June 2023 (07:14:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202201.0167.v1

Midpalatal Suture Density CBCT Evaluation, Sex Gender and Growth Pattern Related Variability in 392 Adolescents Treated With Rapid Maxillary Expander Appliance

Monica Macrì, Elena Toniato, Giovanna Murmura, Giuseppe Varvara, Felice Festa

Subject: Medicine And Pharmacology, Dentistry And Oral Surgery Keywords: rapid palatal expander; midpalatal suture; bone density; cone-beam computed tomography, facial patterns, skeletal growth pattern.

Online: 12 January 2022 (13:42:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202409.0638.v1

Enhanced Acoustic Mixing in Silicon-Based Chips with Sharp-Edged Micro-Structures

Mehrnaz Hashemiesfahan, Pierre Gelin, Han Gardeniers, Wim De Malsche

Subject: Engineering, Chemical Engineering Keywords: sharp corners; fast mixing; acoustofluidics

Online: 9 September 2024 (08:30:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202312.1797.v1

Using Chamfered Mold to Manufacture Micro Glass-Blown Shell Resonator for Gyroscopes

Hoon Yu, Taeyun Kim, Seongmin Ju, Tae-Yoon Kwon

Subject: Physical Sciences, Applied Physics Keywords: mirco resonating integrated gyroscope; fem; inertial sensor; gyroscope; resonator

Online: 25 December 2023 (04:47:20 CET)

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Preprint ARTICLE | doi:10.20944/preprints202307.1455.v1

DEM Simulation of Fast Fluidization of Fine Particles in a Micro Riser

Guorong Wu, Qiang Li, Zhanfei Zuo

Subject: Engineering, Chemical Engineering Keywords: fluidized bed; DEM; numerical simulation; heterogeneous structure; cluster; gas-solid backmixing

Online: 24 July 2023 (03:05:40 CEST)

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In recent years discrete element method (DEM) has gradually been applied to the traditional fluidization simulation of fine particles in micro fluidized bed (MFB). The application of DEM in simulating fast fluidization of fine particles in MFB has not yet received attention. This article presents a drag model that relies on the surrounding environment of particles, namely particle circumstance-dependent drag modle or PCDD model. Fast fluidization in MFB of fine particles is simulated using DEM based on the PCDD model. It is found that the gas-solid two-phase flow in MFB meets the common law of fast fluidization in circulating fluidized bed (CFB) to a certain extent, and also presents a special law that is significantly different from that in CFB. Simulations indicate that the local structure in MFB exhibits particle aggregation which is a natural property of fast fluidized, forming a structure where continuous dilute phase and dispersed concentrated phase coexist. The formation and fragmentation of particle clusters in different local regions of the bed have time synchronization. There exists strong effect of solid back-mixing in MFB, leading to relatively low outlet solid flux. The gas back-mixing effect is, however, not so distinct. The axial porosity shows a monotonically increasing distribution with the bed height, but does not strictly follow the single exponential distribution. The solid volume fraction at the bottom of the bed is significantly lower than the correlated value in CFB. The axial heterogeneous distribution of the cross-sectional average porosity in the lower half of the bed is also weakened. The radial porosity shows a distribution pattern of higher in the central region and lower in the sidewall region. Compared with the correlation results in CFB, the porosity near the central region in MFB is relatively low, while the porosity near the sidewall region is relatively high. The geometric size of the container, especially the radial size, is much smaller than that of a CFB. The relative area of contact between the MFB wall and particles is larger, and the wall friction factor becomes more significant. This may be the main reason for the time synchronization of particle agglomeration, severe particle back-mixing, low outlet solid flux, monotonically increasing axial porosity and weak core-annular structure of radial porosity.

Preprint ARTICLE | doi:10.20944/preprints202306.1038.v1

Detection of Diabetic through Micro Array Genes with enhancement of Classifiers Performance

Dinesh Chellappan, Harikumar Rajaguru

Subject: Engineering, Bioengineering Keywords: Type II Diabetes Mellitus; Machine Learning; Prediction; Dimensionality Reduction; Classifiers

Online: 14 June 2023 (11:38:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202106.0426.v1

Compact Wavelength Selective Crossbar Switch with Cascaded First Order Micro-Ring Resonators

Akhilesh S. P. Khope, Robert Zhang, Roger Helkey, Rod C Alferness, Adel A. M. Saleh, John E Bowers

Subject: Physical Sciences, Optics And Photonics Keywords: Switching; Photonic Integrated Circuits; Optical Switching Devices

Online: 16 June 2021 (08:45:23 CEST)

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Working Paper ARTICLE

A Probe of Micro Space-Time by the Study of Scalar Fields

JIan-Bo Deng, Miao-Yi Deng, Qi-Qi Fan, Peng-Zhang He

Subject: Physical Sciences, Acoustics Keywords: general relativity; scalar field; variational principle

Online: 6 October 2020 (15:50:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201911.0124.v1

Simple Calibration Method for Confocal Microscopy Used in Micro-Additive Manufacturing Processes

Alberto Mínguez Martínez, Jesús de Vicente y Oliva

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: additive manufacturing; confocal microscopy; measurement; calibration; traceability; uncertainty; quality assessment

Online: 12 November 2019 (07:56:55 CET)

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Preprint REVIEW | doi:10.20944/preprints202405.0615.v1

Unraveling Alzheimer’s: Exploring the Gut Microbiota-Brain Axis as a New Frontier in Understanding

Shahzada Mudasir Rashid, Rahil Razak, Aabid Khaliq Tantra, Antonisamy William James, Nuzhat Showkat, Faheem Shehjar, Fatimah Jan, Sheikh Bilal Ahmad, Andleeb Khan, Zahoor A. Shah

Subject: Biology And Life Sciences, Neuroscience And Neurology Keywords: Alzheimer’s Disease; Neurodegenerative disorders; β amyloid, tau protein; Gut microbiota brain axis

Online: 9 May 2024 (16:47:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202312.1334.v1

Microstructure and Properties of FeAlC-x(WC-Co) Composite Coating Prepared through Plasma Transfer Arc Cladding

Bai-Yang Chen, Bo Zhang, Daming Zhao, Peihu Gao, Anton Naumov, Qi-bao Li, Fei Li, Zhong Yang, Yongchun Guo, Jian-Ping Li, Bao-Long Wu, Jin-Yuan Gong, Jia-Wei Liu

Subject: Chemistry And Materials Science, Surfaces, Coatings And Films Keywords: plasma cladding; coating; compacted graphite cast iron; wear resistance

Online: 18 December 2023 (12:19:28 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0692.v1

Efficacy and Safety of Iodixanol in Computed Coronary Tomographic Angiography and Cardiac Catheterization

Matthew Jay Budoff, Hong Seok Lee, Sion K Roy, Chandana Shekar

Subject: Medicine And Pharmacology, Cardiac And Cardiovascular Systems Keywords: iodixanol; cardiac ct; coronary ct; ccta; contrast media; intravenous contrast media; computed tomography; iodixanol; cardiac catheterization; contrast induced nephropathy

Online: 13 October 2023 (03:23:31 CEST)

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Preprint REVIEW | doi:10.20944/preprints202304.1050.v1

The Role of CT Scan in the Work-Up and Management of Blunt and Penetrating Trauma and Acute Surgical Emergencies - A Focused Literature Review

Thobekile Nomcebo Shangase, Timothy Craig Hardcastle

Subject: Medicine And Pharmacology, Surgery Keywords: Multidetector CT; blunt trauma; penetrating trauma; acute surgical emergencies; imaging; utility

Online: 27 April 2023 (05:50:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1301.v1

Assessing the Stress Induced by Novel Packaging in GaN Hemt Devices via Raman Spectroscopy

Zainab Dahrouch, Giuliana Malta, Moreno d’Ambrosio, Angelo Alberto Messina, Mattia Musolino, Alessandro Sitta, Michele Calabretta, Salvatore Patanè

Subject: Physical Sciences, Applied Physics Keywords: AlGaN/GaN high electron mobility transistor; micro-raman spectroscopy; power electronic; packaged device; wafer-level

Online: 22 April 2024 (12:11:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202407.0104.v1

Pneumonia Detection from Chest X-rays Using the CheXNet Deep Learning Algorithm

Himanshu Bairwa, Rinku `Jangid

Subject: Computer Science And Mathematics, Computer Science Keywords: Pneumonia detection, chest X-ray, deep learning,CheXnet, neural networks, medical imaging, image
classification,convolution.

Online: 1 July 2024 (13:14:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.1970.v1

Controlling Gut Microbiota by Twendee X®︎ Also Contributes to Dementia Prevention

Fukka You, Yoshiaki Harakawa, Toshikazu Yoshikawa, Haruhiko Inufusa

Subject: Biology And Life Sciences, Aging Keywords: Alzheimer’s disease; Dementia; Twendee X; microbiome; gut microbiota; Oxidative stress; Quality of life; antioxidant

Online: 31 October 2023 (05:16:08 CET)

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The human gut microbiota (GM) is a complex and dynamic ecosystem that hosts trillions of commensal and potentially pathogenic microorganisms. It is crucial in protecting humans from pathogens and in maintaining immune and metabolic homeostasis. Numerous studies have demonstrated that GM has a significant impact on health and disease, including Alzheimer’s disease (AD). AD is a progressive neurodegenerative disorder characterized by impaired short-term memory and cognitive deficits. Patients with AD have been reported to exhibit abnormalities in GM density and species composition. Oxidative stress (OS) has been implicated in the onset and progression of AD, however, the relationship between OS and gut microbiota in AD onset and progression is not clear. Twendee X®︎ (TwX), an oral supplement consisting of 8 active ingredients, has been shown to prevent dementia in mild cognitive impairment (MCI) in humans and substantially improve cognitive impairment in mouse models of AD. This positive effect is achieved through the potency of the combined antioxidants that regulate OS and therefore similar results cannot be achieved by a single antioxidant ingredient. To examine the impact of long-term OS elevation as seen in AD on the body and GM, we examined GM alterations during the initial OS elevation using a rat 2-week OS loading model, and examined the effects of TwX on OS and GM. Furthermore, using a questionnaire survey and fecal samples, we analyzed the impact of TwX on healthy individuals' gut bacteria and the associated effect on their quality of life (QOL). TwX was found to increase the number of bacteria species and their diversity in GM, as well as butyrate-producing bacteria, which tend to be reduced in AD patients. Additionally, TwX improved defecation condition and QOL. The gut bacteria function as part of the homeostatic function during OS elevation, and prophylactic administration of TwX strengthened this function. The results suggests that the preventative effect of TwX on dementia may involve the GM in addition to the other effects previously demonstrated.

Preprint ARTICLE | doi:10.20944/preprints202002.0045.v1

A Fully Coaxial Tunable Broadband Power Equalizer for an X-band MPM

Patrizia Livreri, Fabio Lo Gerfo

Subject: Engineering, Electrical And Electronic Engineering Keywords: Broadband power equalizer; coaxial; MPM; TWT; X-band

Online: 4 February 2020 (10:45:44 CET)

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Preprint ARTICLE | doi:10.20944/preprints201807.0340.v1

Dialectical GAN for SAR Image Translation: From Sentinel-1 to TerraSAR-X

Dongyang Ao, Corneliu Octavian Dumitru, Gottfried Schwarz, Mihai Datcu

Subject: Engineering, Electrical And Electronic Engineering Keywords: dialectical generative adversarial network; image translation; Sentinel-1; TerraSAR-X

Online: 19 July 2018 (04:46:22 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0829.v1

Could Pulmonary Inflammation of COVID-19 ARDS Patients Worsen Due to an Excessive Repetition of Follow up Radiological Studies?

David Macias-Verde, Javier Burgos-Burgos, Pedro C. Lara, Edward Calabrese

Subject: Medicine And Pharmacology, Immunology And Allergy Keywords: Acute Respiratory Distress Syndrome; COVID-19; Computed Tomography; Hormesis; Ionizing radiation; NLRP3 inflammasome

Online: 11 May 2023 (08:50:49 CEST)

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Working Paper ARTICLE

COVID19 Detection from Radiographs: Is Deep Learning Able to Handle the Crisis?

Muhammad Saqib, Saeed Anwar, Abbas Anwar, Lars Petersson, Nabin Sharma, Michael Blumenstein

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: COVID-19; Deep learning; Convolutional neural network; Computed Tomography; X-Rays; Classification; Detection

Online: 14 June 2020 (17:51:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1331.v1

The Central Fluid Percussion Brain Injury in a Gyrencephalic Pig Brain; Scalable Diffuse Injury and Tissue Viability for Glial Cell Immunolabeling Following Long-Term Refrigerated Storage

Mark Pavlichenko, Audrey D. Lafrenaye

Subject: Biology And Life Sciences, Neuroscience And Neurology Keywords: Traumatic brain injury; Axonal injury; Micro pig; Diffuse pathology; Microglia; Aged tissue

Online: 18 May 2023 (10:33:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.1494.v1

A Dataset of Visible Light and Thermal Infrared Images for Health Monitoring of Caged Laying Hens in Large-scale Farming

Weihong Ma, Xingmeng Wang, Xianglong Xue, Mingyu Li, Simon X. Yang, Yuhang Guo, Ronghua Gao, Lepeng Song, Qifeng Li

Subject: Engineering, Bioengineering Keywords: Chicken Head Detection; Laying Hen Counting; Caged Henhouse Health Inspection; Visible Light and Thermal Infrared Image Alignment; Deep Learning

Online: 21 August 2024 (09:44:06 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2115.v1

Long Term Side Effects of Testicular Cancer and Treatment (Observational Study of Mortality and Morbidity in Testicular Cancer Survivors)

M Raheel Khan, Patrice Kearney Sheehan, Ashley Bazin, Abdul Rehman Farooq, Christine Leonard, Umair Aleem, Lynda Corrigan, Ray Mc Dermott

Subject: Medicine And Pharmacology, Oncology And Oncogenics Keywords: testicular cancer; survivors; late side effects; germ cell tumours; cancer survivors

Online: 29 August 2024 (12:02:33 CEST)

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Preprint INTERESTING IMAGES | doi:10.20944/preprints202305.1169.v1

Dynamic and Static ¹⁸F-FDG PET/CT Imaging in SMARCA4-Deficient Non-small Cell Lung Cancer and Response to Therapy: A Case Report

Xieraili Wumener, Xiaoxing Ye, Yarong Zhang, Shi Jin, Ying Liang

Subject: Medicine And Pharmacology, Pulmonary And Respiratory Medicine Keywords: 18F-FDG; PET/CT; SMARCA 4; NSCLC; Dynamic imaging；Efficacy evaluation

Online: 17 May 2023 (02:37:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.1428.v1

Comparison between One-Stage and Two-Stage CT-guided Localization of Lung Nodules with Surgical Resection: A Single Medical Center Experience

Kai Yun Hsueh, En Kuei Tang, Fu Zong Wu, Ping Chung Tsai, Chih Wen Shu, Yih Gang Goan, Yen Chiang Tseng

Subject: Medicine And Pharmacology, Pulmonary And Respiratory Medicine Keywords: CT-guided localization; OSCT; TSCT; pulmonary lesions; minimal invasive VATS

Online: 21 July 2023 (02:31:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202303.0184.v1

CT Rendering and Radiomics Analysis in Post-Chemotherapy Retroperitoneal Lymph Node Dissection for Testicular Cancer To Anticipate Difficulties for Young Surgeons

Anna Scavuzzo, Pavel Figueroa Rodriguez, Alessandro Stefano, Nallely Jimenez Guedulain, Sebastian Muruato Araiza, Jose de Jesus Cendejas Gomez, Alejandro Quiroz Compeán, Dimas Omar Victorio Vargas, Miguel Angel Jimenez Rios

Subject: Medicine And Pharmacology, Urology And Nephrology Keywords: testicular cancer; radiomics; retroperitoneal surgery

Online: 10 March 2023 (02:28:40 CET)

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Working Paper ARTICLE

A Deep Transfer Learning Model with Classical Data Augmentation and CGAN to Detect COVID-19 from Chest CT Radiography Digital Images

Mohamed Loey, Gunasekaran Manogaran, Nour Eldeen M. Khalifa

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: COVID-19; 2019 novel coronavirus; SARS-CoV-2; Deep Transfer Learning; Convolutional Neural Network; Machine Learning; CGAN

Online: 5 May 2020 (04:14:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.0107.v2

Group Theory of Messenger RNA Metabolism and Disease

Michel Planat, Marcelo Amaral, Fang Fang, David Chester, Raymond Aschheim, Klee Irwin

Subject: Biology And Life Sciences, Biochemistry And Molecular Biology Keywords: RNA metabolism; micro-RNAs; diseases; finitely generated group; SL(2,C) character variety; aperiodicity

Online: 23 October 2023 (11:16:53 CEST)

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Working Paper ARTICLE

Coupled Electric and Hydraulic Control of a PRS Turbine in a Real Transport Water Network

Marco Sinagra, Costanza Aricò, Tullio Tucciarelli, Pietro Amato, Michele Fiorino

Subject: Engineering, Civil Engineering Keywords: pressure control; micro-hydropower; energy recovery; Water distribution network; Banki turbine; energy harvesting

Online: 20 May 2019 (09:43:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.0696.v1

Comparison of Electromagnetic Induction and Electrical Resistivity Tomography in Assessing Soil Salinity: Insights From Four Plots With Distinct Soil Salinity Levels

Maria Catarina Paz, Nádia Luísa Castanheira, Ana Marta Paz, Maria Conceição Gonçalves, Fernando Monteiro Santos, Mohammad Farzamian

Subject: Environmental And Earth Sciences, Soil Science Keywords: electromagnetic induction; electrical resistivity tomography; soil salinity

Online: 9 January 2024 (05:11:25 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.1672.v1

Assessment of Hounsfield Units and Factors Associated with Fragmentation of Renal Stones by Extracorporeal Shock Wave Lithotripsy: A Computerized Tomography Study

Abdallah Saud Alharbi, Moawia Gameraddin, Awadia Gareeballah, Zahra Jibril Shrwani, Moa’ath Abdullah Sindi, Hassan Ibrahim Alsaedi, Abdulaziz A. Qurashi, Khalid M Aloufi, Abdullah Fahad A. Alshamrani, Amel F Alzain

Subject: Medicine And Pharmacology, Urology And Nephrology Keywords: fragmentation; CT number; renal stones; ESWL; serum calcium; uric acid

Online: 26 October 2023 (10:55:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0362.v1

Effects of Different Parameter Settings for 3D Data Smoothing and Mesh Simplification on Towards Near Real-Time 3D Reconstruction of High Resolution Bioceramic Bone Void Filling Medical Images

Daniel Jie Yuan Chin, Ahmad Sufril Azlan Mohamed, Khairul Anuar Shariff, Mohd Nadhir Ab Wahab, Kunio Ishikawa

Subject: Computer Science And Mathematics, Probability And Statistics Keywords: 3D reconstruction; 3D data smoothing; mesh simplification; high resolution micro-CT images

Online: 25 October 2021 (15:34:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202405.1762.v1

Race and Gender Disparity of Dietary Lycopene Intake and Periodontitis Severity in Older Adults

Katherine Kwong, You Lu, ZhuoHuan Li, Ting Luo, Zhaoyu Huang, Na Zhao, Tung-Sung Tseng

Subject: Public Health And Healthcare, Public Health And Health Services Keywords: Lycopene Intake; Periodontitis; Older Adults; Racial Disparity

Online: 28 May 2024 (04:43:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201807.0616.v2

Mechanical Properties and In-Situ Deformation Imaging of Micro-Lattices Manufactured by Laser Based Powder Bed Fusion

Anton du Plessis, Dean-Paul Kouprianoff, Ina Yadroitsava, Igor Yadroitsev

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: laser powder bed fusion; additive manufacturing; X-ray tomography; in-situ imaging; Ti6Al4V; lattice structures

Online: 30 August 2018 (06:12:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.1138.v1

The Presence of the Human Auditory Ossicles -Detected Post-mortem by CT Scan- as a Taphonomic Indicator

Edda Emanuela Guareschi, Sara Poggesi, Marco Palmesino, Paola Annarosa Magni

Subject: Biology And Life Sciences, Other Keywords: burial; entombment; ossicular chain; postmortem imaging; postmortem interval; preservation; submersion

Online: 18 September 2023 (09:33:58 CEST)

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Three tiny bones compose the human ossicular chain: malleus, incus and stapes. Also known as auditory ossicles, they are united by joints in the middle ear cavity of the petrous part of the temporal bone. Completely developed 2 years after birth, the ossicular chain is involved in the physiological process of hearing, by which sound waves from the environment are converted into electrochemical impulses. In the last 500 years, most studies have focussed on the morphogenesis, morphological variability and clinical pathology of the ossicular chain, whilst only a few studies have added relevant knowledge to anthropology and forensic science. The auditory ossicles and the enclosing petrous bone are some of the hardest in the human skeleton. This reflects in a relative resistance to fire. In the post mortem period and in favourable circumstances, the auditory ossicles can fossilize and survive for millions of years. Post mortem loss in skeletal or decomposed remains can be ascribed to their destruction or physical displacement, by either macro-micro-faunal action and/or any other natural or artificial disturbance. Physical displacement is closely connected to the depositional environment of the skeletal remains, such as burial, entombment (sarcophagus, coffin, vault…), submersion or exposure to natural elements. Auditory ossicles can be recovered in situ, or very close to their anatomical location, when the skeletal material has been involved in an archaeological excavation. In the case of accessible or disturbed remains, scavengers may remove the tiny ossicles, and/or they can slip out of the middle ear cavity following skull movements. Entombment offers an effective protection against the displacement of the auditory ossicles, whereas aquatic submersion and aquatic movement almost invariably displace them. The preservation of the human auditory ossicles should be critically considered in the comprehensive context of any forensic investigation on human remains, since it can assist the reconstruction of their taphonomic history. Taphonomic histories of remains can add crucial information to forensic investigations (e.g., the Post Mortem Interval, PMI). The aim of this study, limited by scarce relevant literature, is to discuss the potential role of the ossicular chain, detected by post mortem imaging techniques, as a taphonomical indicator in decomposing and/or skeletonized bodies.

Preprint ARTICLE | doi:10.20944/preprints202302.0198.v1

Automated Quantification of Pneumonia Infected Volume in Lung CT Images: A Comparison With Subjective Assessment of Radiologists

Seyedehnafiseh Mirniaharikandehei, Alireza Abdihamzehkolaei, Angel CHOQUEHUANCA, MARCO AEDO, WILMER PACHECO, LAURA ESTACIO, VICTOR CAHUI, LUIS HUALLPA, KEVIN QUIÑONES, VALERIA CALDERON, ANA GUTIERREZ, ANA VARGAS, DERY GAMERO, EVELING CASTRO, Yuchen Qiu, Bin Zheng, Javier Jo

Subject: Engineering, Electrical And Electronic Engineering Keywords: Infected lung segmentation; Quantification of lung disease severity; Comparison be-tween manual and automated image segmentation; Deep Neural Network; COVID-19 detections; COVID-19 severity assessment

Online: 13 February 2023 (06:33:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202307.0821.v1

Groundwater Investigation through Electrical Resistivity Tomography in the Galhareri District, Galgadud Region, Somalia: Insights into Hydrogeological Properties

Mahad Abdullahi Hussein, Mohammed Yusuf Ali, Hassan Ali Hussein

Subject: Environmental And Earth Sciences, Geophysics And Geology Keywords: Aquifer, electrical resistivity tomography, groundwater, Galgaduud region, Somalia.

Online: 13 July 2023 (05:21:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202112.0284.v1

Assessment of the Effectiveness of Obstructive Sleep Apnea Treatment Using Optical Coherence Tomography to Evaluate Retinal Findings

Gloria Tejero-Garcés, Francisco J Ascaso, Paula Casas, Maria I Adiego, Peter Baptista, Carlos O'Connor-Reina, Eugenio Vicente, Guillermo Plaza

Subject: Medicine And Pharmacology, Pulmonary And Respiratory Medicine Keywords: Retina; Retinal nerve fiber layer; Obstructive sleep apnea syndrome; Optical coherence tomography; OCT; CPAP; Upper airway surgery.

Online: 17 December 2021 (08:47:15 CET)

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Preprint COMMUNICATION | doi:10.20944/preprints202008.0011.v1

Enhancing Electrical Contact with a Commercial Polymer for Electrical Resistivity Tomography on Archaeological Sites: A Case Study

Marco D. Vásconez-Maza, Pedro Martínez-Pagán, Hasan Aktarakçi, María C. García-Nieto, Marcos A. Martínez-Segura

Subject: Environmental And Earth Sciences, Geophysics And Geology Keywords: electrical resistivity tomography (ERT) method; polymer; carbomer; ground-electrode electrical contact enhancement; archaeology

Online: 2 August 2020 (10:58:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1351.v1

Micro and Nano Pollutants from Tires and Car Brakes Generated in Winter Season in the Poznan City Urban Environment

Robert Edward Przekop, Bogna Sztorch, Daria Pakuła, Eliza Romańczuk-Ruszuk, Roksana Konieczna, Miłosz Frydrych

Subject: Environmental And Earth Sciences, Waste Management And Disposal Keywords: tire; rubber; metal oxides; environmental pollution; nanoparticles; microparticles

Online: 19 April 2024 (16:00:11 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202407.0886.v1

A New Test Method of “Nuclear Magnetic Resonance + High-Speed Centrifugation” for Gas-Water Relative Permeability Curve of Low-Permeability and Tight Sandstone

Fenglai Yang, Huaxun Liu, Shusheng Gao, Sijie He, Feifei Fang, Cuili Wang, Liyou Ye, Kun Zhou, Xuejun Yang, Weiguo An

Subject: Physical Sciences, Fluids And Plasmas Physics Keywords: Low permeability and tight sandstone; Nuclear magnetic resonance (NMR); High speed centrifugation; Micro pore structure; Gas-water relative permeability curve

Online: 11 July 2024 (08:28:50 CEST)

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Gas-water relative permeability curve is the foundation of gas reservoir dynamic analysis and numerical simulation. It is generally obtained through gas displacing water experiment. Referring to the existing national standards, gas-water relative permeability test is carried out for low-permeability and tight sandstone. The flow is discontinuous and the curve smoothness is poor, which affects the application of gas-water relative permeability curve. Based on the comparative analysis of a large number of mercury injection and NMR experimental results of low-permeability and tight sandstone, a method to characterize the throat radius distribution of low-permeability tight sandstone based on NMR T2 spectrum is explored. Combined with high-speed centrifugal experiment, the calculation formulas of core water saturation, phase relative permeability of gas-water under different centrifugal force are established. A new method of "nuclear magnetic resonance + high-speed centrifugation" for gas-water relative permeability curve test of low-permeability and tight sandstone is formed, and the test is carried out on Sulige low-permeability tight sandstone core. The results show that: (1) The shape of cumulative distribution curve of throat radius by mercury injection method is basically consistent with that of T2 relaxation time by NMR, and there is a good corresponding relationship between them. (2) The centrifugation process is similar to the gas displacing water process. With the decrease of water saturation, water centrifugation in rock core becomes more and more difficult until it become irreducible. (3) The test process of the new method is unified and standard and up to 6 cores can be tested at the same time. The calculation results of water saturation and relative permeability curve are reliable and the integral curve is smooth, which greatly improves the test efficiency of gas-water relative permeability curve in low-permeability and tight sandstone. The new method can be widely used to study the gas-water two-phase seepage law in low-permeability and tight sandstone gas reservoir.

Preprint ARTICLE | doi:10.20944/preprints202403.1844.v1

Normalized Clinical Severity Scores Reveal a Correlation between X Chromosome Inactivation and Disease Severity in Rett Syndrome

Jonathan K. Merritt, Xiaolan Fang, Raymond C. Caylor, Steven A. Skinner, Michael J. Friez, Alan K. Percy, Jeffrey L. Neul

Subject: Medicine And Pharmacology, Neuroscience And Neurology Keywords: Rett Syndrome, X Chromosome Inactivation, longitudinal modeling

Online: 29 March 2024 (10:27:34 CET)

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Preprint REVIEW | doi:10.20944/preprints202307.0605.v1

Insight and Recommendations for Fragile X Premutation Associated Conditions from the 5th International Conference on FMR1 Premutation

Flora Tassone, Dragana Protic, Emily Allen, Alison D. Archibald, Anna Baud, W Ted Brown, Dejan B. Budimirovic, Jonathan Cohen, Brett Dufour, Rachel Eiges, Nicola Elvassore, Lidia V. Gabis, Samantha J Grudzien, Deborah Hall, David Hessl, Abigail Hogan, Jessica Ezzell Hunter, Peng Jin, Poonnada Jiraanont, Jessica Klusek, R. Frank Kooy, Claudine M Kraan, Cecilia Laterza, Andrea Lee, Karen Lipworth, Molly Losh, Danuta Z Loesch, Reymundo Lozano, Marsha Mailick, Apostolos Manolopoulos, Verónica Martínez-Cerdeño, Yingratana Amabel McLennan, Robert M. Miller, Alice Montanaro, Matthew W. Mosconi, Sarah Potter, Melissa Raspa, Susan M. Rivera, Katharine Shelly, Peter K. Todd, Katarzyna Tutak, Jun Yi Wang, Anne C Wheeler, Tri Indah Winarni, Marwa Zafarullah, Randi Hagerman

Subject: Medicine And Pharmacology, Medicine And Pharmacology Keywords: FMR1 premutation; FXPAC; FXTAS; FXAND; FXPOI; FMR1 molecular and clinical

Online: 10 July 2023 (10:27:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0709.v1

Enhanced Alkaline Hydrogen Evolution on Gd1.0/Ndx (X = 0.5, 1.0, 3.0, and 6.0%)-Doped TiO₂ Bimetallic Electrocatalysts

Mohammed Alsawat, Naif Ahmed Alshehri, Abdallah A. Shaltout, Sameh I Ahmed, Hanan M. O. Al-Malki, Rabah Boukherroub, Mohammed A Amin, Mohamed M Ibrahim

Subject: Chemistry And Materials Science, Electrochemistry Keywords: Titanium dioxide; Rare earth-doped TiO2 nanoparticles; Electrochemical Hydrogen generation; Alkaline

Online: 10 May 2023 (08:23:46 CEST)

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The work reports a facile synthesis of high thermally-stable nanocrystalline anatase TiO2 nanoparticles (NPs) doped with different atomic concentrations (0.5, 1.0, 3.0, and 6.0%) of Gd3+ and Nd3+ ions by a template-free and one-step solvothermal process, using titanium(IV) butoxide as titanium precursor and dimethyl sulfoxide (DMSO) as solvent. The structure and morphology of the Gd3+, Nd3+, and 0.5%Gd3+-0.5%Nd3+/doped TiO2 NPs have been characterized by using various analytical techniques. The Gd3+/ and Nd3+/TiO2 molar ratios were found to have a pronounced impact on the crystalline structure, size, and morphology of TiO2 NPs. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies revealed the proper substitution of Ti4+ by Gd3+ and Nd3+ ions in the TiO2 host lattice. The as-prepared Gdx/TiO2, Ndx/TiO2, and Gd1.0/Ndx/TiO2 bimetallic NPs, x = 0.5, 1.0, 3.0, and 6%, have been investigated as electrocatalysts for hydrogen evolution reaction (HER) in 1.0 M KOH solution using a variety of electrochemical techniques. At any doping percentage, the Gd1.0/Ndx/TiO2 bimetallic NPs showed higher HER catalytic performance than their corresponding counterparts i.e. Gdx/TiO2 and Ndx/TiO2. Upon increasing the Nd content from 0.5 to 6.0%, the HER catalytic performance of the Gd1.0/Ndx/TiO2 bimetallic NPs was generally enhanced. Among the studied materials, the bimetallic Gd1.0/Nd6.0/TiO2 NPs emerged as the most promising catalyst with an onset potential of -22 mV vs. RHE, a Tafel slope of 109 mV dec-1, and an exchange current density of 0.72 mA cm-2. Such HER electrochemical kinetic parameters are close to those recorded by the commercial Pt/C (onset potential: -15 mV, Tafel slope: 106 mV dec-1, and exchange current density: 0.80 mA cm-2), and also comparable with those measured by the most active electrocatalysts reported in the literature. The synergistic interaction of Gd and Nd is thought to be the major cause of the bimetallic catalyst's activity.

Preprint ARTICLE | doi:10.20944/preprints202308.1179.v1

Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine

Shuji Kamegaki, Daniel Smith, Meguya Ryu, Soon Hock Ng, Hsin-Hui Huang, Pegah Maasoumi, Jitraporn Vongsvivut, Daniel Moraru, Tomas Katkus, Saulius Juodkazis, Junko Morikawa

Subject: Environmental And Earth Sciences, Remote Sensing Keywords: Anisotropy; polarisation analysis; Stokes parameters; polarimetry; olivine

Online: 16 August 2023 (09:33:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.0038.v1

Simulation-Based Analysis of Micro-Damage to Recycled Concrete Containing Brick Coarse Aggregate

Lin Qi, Baoyang Yu, Mingxin Yu, Mingyue Zhang

Subject: Engineering, Civil Engineering Keywords: brick concrete aggregate; brick content; random aggregate; interface transition zone; microscopic damage

Online: 1 August 2023 (10:00:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202104.0180.v1

Optical Intensity Far-Field Distribution of MEMS Micro-mirror Arrays by Fraunhofer Diffraction

Bin Zhang, Yu Zhang, Guohui Yang, Chunhui Wang

Subject: Physical Sciences, Optics And Photonics Keywords: MEMS Mirror Arrays; Laser beam; Fraunhofer Diffraction; Optical Intensity

Online: 6 April 2021 (13:47:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202311.1045.v1

Robustness of Single and Dual-Energy Deep Learning-Based Scatter Correction Models on Simulated and Real Chest X-rays

Clara Freijo, Joaquin L. Herraiz, Fernando Arias-Valcayo, Paula Ibáñez, Gabriela Moreno, Amaia Villa-Abaunza, Jose M. Udias

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: x-ray image; scatter correction; deep learning; dual energy; monte carlo simulations

Online: 16 November 2023 (07:43:59 CET)

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Preprint REVIEW | doi:10.20944/preprints202405.2149.v1

Computational Fluid-Structure Interaction in Microfluidics

Hafiz Muhammad Musharaf, Uditha Roshan, Amith Mudugamuwa, Quang Thang Trinh, Jun Zhang, Nam-Trung Nguyen

Subject: Engineering, Mechanical Engineering Keywords: Micro elastofluidics; fluid-structure interaction; computational methods; microdevices; cardiovascular modelling

Online: 1 June 2024 (09:33:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202311.1290.v1

Fraxicon for Optical Applications with Aperture ∼1 mm

Haoran Mu, Daniel Smith, Soon Hock Ng, Vijayakumar Anand, Nguyen Hoai An Le, Raghu Dharmavarapu, Zahra Khajehsaeidimahabadi, Rachael T. Richardson, Patrick Ruther, Paul R. Stoddart, Henrikas Gricius, Tomas Baravykas, Darius Gailevičius, Gediminas Seniutinas, Tomas Katkus, Saulius Juodkazis

Subject: Biology And Life Sciences, Biophysics Keywords: fraxicon; micro-optics; RGB; SZ2080™ resist; direct-laser-writing

Online: 21 November 2023 (10:42:14 CET)

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Preprint REVIEW | doi:10.20944/preprints202203.0273.v1

Alternatives for MRI in Prostate Cancer Diagnostics – Review of Current Ultrasound-Based Techniques

Adam Gurwin, Kamil Kowalczyk, Klaudia Knecht-Gurwin, Paweł Stelmach, Łukasz Nowak, Wojciech Krajewski, Tomasz Szydełko, Bartosz Małkiewicz

Subject: Medicine And Pharmacology, Urology And Nephrology Keywords: prostate cancer; ultrasonography; biopsy; micro-ultrasound; elastography; contrast-enhanced ultrasound

Online: 21 March 2022 (04:26:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints201910.0052.v1

Optical Damage Thresholds of Microstructures Made by Laser 3D Nanolithography

Agnė Butkutė, Laurynas Čekanavičius, Gabrielius Rimšelis, Darius Gailevičius, Vygantas Mizeikis, Andrius Melninkaitis, Tommaso Baldacchini, Linas Jonušauskas, Mangirdas Malinauskas

Subject: Physical Sciences, Optics And Photonics Keywords: 3D laser lithography; laser induced damage threshold; micro-optics; photonics

Online: 4 October 2019 (11:56:36 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201710.0115.v1

A Radar-Based Smart Sensor for Unobtrusive Elderly Monitoring in Ambient Assisted Living Applications

Giovanni Diraco, Alessandro Leone, Pietro Siciliano

Subject: Engineering, Electrical And Electronic Engineering Keywords: fall detection; vital signs monitoring; ultra-wideband radar; micro-Doppler

Online: 17 October 2017 (11:45:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.0487.v1

Estimating the Carbon Footprint of Healthcare in the Canton of Geneva and Reduction Scenarios for 2030 and 2040

Bruno Mermillod, Raphaël Tornare, Nicolas Ray, Antoine Flahault

Subject: Public Health And Healthcare, Public, Environmental And Occupational Health Keywords: carbon footprint; Geneva’s healthcare; carbon dioxide; greenhouse gas; healthcare system; sustainability

Online: 8 April 2024 (10:06:28 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202408.2092.v1

Design and On-Orbit Performance of Ku-Band Phase-Array SAR Payload System

Wei Yan, Xiaomin Tan, Jiang Wu, Mingze Yuan, Hongxing Dang, Wujun Chang

Subject: Engineering, Aerospace Engineering Keywords: Ku band; SAR system; payload; Taijing-4(03); on-orbit; application; micro-nano; satellite

Online: 29 August 2024 (07:14:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201903.0009.v1

Self-Reported and Parent-Reported School Bullying in Adolescents with High Functioning Autism Spectrum Disorder: The Roles of Autistic Social Impairment, Attention-Deficit/Hyperactivity and Oppositional Defiant Disorder Symptoms

Wen-Jiun Chou, Ray C. Hsiao, Hsing-Chang Ni, Hsin-Yi Liang, Chiao-Fan Lin, Hsiang-Lin Chan, Yi-Hsuan Hsieh, Liang-Jen Wang, Min-Ching Li, Huei-Fan Hu, Cheng-Fang Yen

Subject: Social Sciences, Behavior Sciences Keywords: Bullying; autism spectrum disorder; attention-deficit/hyperactivity disorder; oppositional defiant disorder; social impairment.

Online: 1 March 2019 (12:24:17 CET)

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Preprint ARTICLE | doi:10.20944/preprints202407.1031.v1

Predictive and Prognostic 18F-Fluorocholine PET/CT Radiomics Nomogram in Patients With Castration-Resistant Prostate Cancer With Bone Metastases Treated With ²²³Ra

Marcos Cruz-Montijano, Mariano Amo-Salas, Javier Cassinello-Espinosa, Iciar García-Carbonero, Jose Carlos Villa-Guzman, Ana Maria Garcia-Vicente

Subject: Medicine And Pharmacology, Oncology And Oncogenics Keywords: 18F-Fluorocholine PET/CT; radiomics; Radium-223 dichloride; castration-resistant prostate cancer with bone metastases (CRPC-BM); therapeutic failure; overall survival; nomogram.

Online: 12 July 2024 (11:18:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202404.1001.v1

Study on Local Vibration Control of 100m X-BOW Polar Exploration Cruise Ship

Guo he Jiang, Jia chen Chen, Hao Guo, Gang Wu, Zhen zhen Liu

Subject: Engineering, Marine Engineering Keywords: polar exploration cruise; frequency response analysis; modal equivalent mass; tuned mass dampers; mass ratio

Online: 16 April 2024 (11:37:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202206.0336.v1

Cell division controls final fruit size in three apple (Malus x domestica) cultivars

Siti Khadijah A. Karim, Andrew C. Allan, Robert J. Schaffer, Karine M. David

Subject: Biology And Life Sciences, Agricultural Science And Agronomy Keywords: apple; fruit size; fruit development; cell division; cell expansion; ripening

Online: 24 June 2022 (09:46:09 CEST)

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Preprint CONCEPT PAPER | doi:10.20944/preprints202111.0508.v1

Imagining Sustainable Human Ecosystems with Power-to-x in-situ Resource Utilisation Technology

Mark Baldry, Nicholas Gurieff, Declan Keogh

Subject: Engineering, Energy And Fuel Technology Keywords: Power-to-X; Space; energy storage; in-situ resource utilisation; ammonia; circular economy;

Online: 26 November 2021 (13:07:24 CET)

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Working Paper ARTICLE

Automatic Detection of Pneumonia in Chest X-Rays using Lobe Deep Residual Network

Daniel Kvak, Karolína Kvaková

Subject: Computer Science And Mathematics, Artificial Intelligence And Machine Learning Keywords: automatic detection; chest X-ray; convolutional neural network; COVID-19; deep learning; feature extraction; image classification; pneumonia

Online: 27 April 2021 (14:08:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.1869.v1

Auto-Segmentation and Quantification of Non-cavitated Enamel Caries Imaged with Swept Source OCT

Tamer Abdelrehim, Maha Salah, Alex Fok, Heather J Conrad, Hooi Pin Chew

Subject: Engineering, Bioengineering Keywords: OCT; Micro CT; SEM; Image Segmentation; Carious; batch-processing; Simulation; Dental imaging; demineralization; Quantification

Online: 30 October 2023 (08:38:32 CET)

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Preprint CASE REPORT | doi:10.20944/preprints202409.0874.v1

Case Report: Pulmonary Vein Stenosis 2 Years Following Catheter Ablation

Chandana Kulkarni, John Burk

Subject: Medicine And Pharmacology, Pulmonary And Respiratory Medicine Keywords: Pulmonary Vein Stenosis; Catheter Ablation; Atrial Fibrillation; Radiofrequency Ablation (RFA); Cardiovascular Complications; Multimodal Imaging; Computed Tomography Angiography (CTA); Pulmonary Hypertension; Stent Implantation; Balloon Angioplasty; Postablation Surveillance; Pulmonary Vascular Disease; Pulmonary Perfusion; Pulmonary Vein Occlusion; Pulse Electrical Field (PEF) Ablation

Online: 11 September 2024 (08:51:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0261.v1

In-Hospital Rehabilitation of Patients with COVID-19: A Retrospective Study with Propensity Score Matching

Sergey M. Konev, Elisaveta S. Koneva, Teimurazi R. Matsonashvili, Ekaterina N. Zhumanova, Danil S. Malyutin, Natalia S. Serova, Evgeny E. Achkasov, Igor V. Semenyakin, Konstantin V. Lyadov, Irina A. Mandel, Andrey I Yaroshetskiy

Subject: Medicine And Pharmacology, Clinical Medicine Keywords: COVID-19; early rehabilitation; computed tomography; physical exercises; chest massage in an electrostatic field.

Online: 5 June 2023 (08:06:38 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202211.0529.v1

Surveillance of Daughter Micronodule Formation is A Key Factor for Vaccine Evaluation Using Experimental Infection Models of Tuberculosis in Macaques

Isabel Nogueira, Martí Català, Andrew D White, Sally A Sharpe, Jordi Bechini, Clara Prats, Cristina Vilaplana, Pere-Joan Cardona

Subject: Medicine And Pharmacology, Pathology And Pathobiology Keywords: tuberculosis; BCG vaccine; aerosol vaccination; non-human primate; macaque; bubble model; computed tomography scanner

Online: 29 November 2022 (03:29:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0371.v1

A Novel Approach to the Holistic 3D Characterization of Weld Seams – Paving the Way for Deep Learning-Based Process Monitoring

Maximilian Schmoeller, Christian Stadter, Michael Karl Kick, Christian Geiger, Michael Friedrich Zaeh

Subject: Engineering, Industrial And Manufacturing Engineering Keywords: non-destructive testing; weld seam contour; microfocus computed tomography; laser beam welding; Deep Learning

Online: 25 October 2021 (15:54:02 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0725.v1

A Brief Review on Micro-particle Slurry Rheology in Grinding and Flotation for Enhancing Fine Mineral Processing Efficiency

Guangsheng Zeng, Yangge Zhu, Wei Chen

Subject: Engineering, Mining And Mineral Processing Keywords: slurry rheology; froth rheology; grinding; flotation; fine particle

Online: 10 May 2023 (09:55:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.0678.v1

Uptake of Breathable Nano- and Micro-Sized Polystyrene Particles: Comparison of Virgin and Oxidised nPS/mPS in Human Alveolar Cells

Antonio Laganà, Giuseppa Visalli, Alessio Facciolà, Consuelo Celesti, Daniela Iannazzo, Angela Di Pietro

Subject: Biology And Life Sciences, Toxicology Keywords: environmental wear; uptake; cytotoxicity; ROS overproduction; mitochondrial dysfunction

Online: 11 July 2023 (07:17:51 CEST)

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Preprint REVIEW | doi:10.20944/preprints202202.0125.v1

A Review on the Enhancement of Mechanical and Tribological Properties of MCrAlY Coatings Reinforced by Dispersed Micro- and Nano-Particles

Ali Zakeri, Elnaz Bahmani, Ali Ramazani

Subject: Chemistry And Materials Science, Surfaces, Coatings And Films Keywords: metal matrix composites; MCrAlY; mechanical properties; tribological properties; wear; erosion

Online: 8 February 2022 (19:07:50 CET)

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