检索结果-内蒙古大学图书馆

An efficient direct-forcing immersed boundary method for flow around a pair of spheres

International Journal for Numerical Methods in Fluids 2024年第12期96卷 1830-1863页

作者： Lo, Der Chang Lee, Katherine Shen, Pao-Lan Department of Maritime Information and Technology National Kaohsiung University of Science and Technology Kaohsiung City Taiwan PhD Program in Maritime Science and Technology College of Maritime National Kaohsiung University of Science and Technology Kaohsiung City Taiwan

The numerical study of flow around a pair of spheres and a square array of spheres is investigated by using a direct-forcing immersed boundary method. Using high resolution three-dimensional computations, we analyzed the flow around several configurations: a sphere, a pair of spheres in a tandem arrangement with center-to-center streamwise ratio L/D ranging from 1 to 6, and a square array with 9 spheres in a uniform arrangement. In the latter case, we explore the ratio of array diameter (DG) to sphere diameter (D) at 4, 5, 6 and 7. The center-to-center streamwise and transverse pitch is the same, varied from L/D = 1.5, 2, 2.5 to 3, and they were arranged in a square periodic array to allow uniform distribution within the array. Based on the effective direct-forcing immersed boundary projection method, the fractional time marching methodology is applied for solving four field variables involving three velocities and one pressure component. The pressure Poisson equation is advanced in space by using the fast Fourier transform (FFT) and a tridiagonal matrix algorithm (TDMA), effectively solving for the diagonally dominant tridiagonal matrix equations. A direct-forcing immersed boundary method is involved to treat the interfacial terms by adding the appropriate sources as force function at the boundary, separating the phases. Geometries featuring the stationary solid obstacles in the flow are embedded in the Cartesian grid with special discretizations near the embedded boundary using a discrete Dirac delta function to ensure the accuracy of the solution in the cut cells. An important characteristic of flow over the multiple spheres is devised by comparing with the drag and lift coefficients, as well as vortex shedding. © 2024 John Wiley & Sons Ltd.

关键词： Spheres

来源：评论

学校读者我要写书评

暂无评论

LANDSLIDE SUSCEPTIBILITY MAPPING IN LUNAR SOUTH POLE REGION 24

LANDSLIDE SUSCEPTIBILITY MAPPING IN LUNAR SOUTH POLE REGION

引用

24th International Multidisciplinary Scientific Geoconference: Nano, Bio, Green and space - Technologies for a Sustainable Future, SGEM 2024

作者： Ermini, Andrea Salvini, Riccardo Marrocchesi, Pier Simone Department of Physical Sciences Earth and Environment and Centre of Geotechnologies University of Siena Italy National PhD Program in Space Science and Technology University of Trento Italy Department of Physical Sciences Earth and Environment University of Siena Italy

ISBN: (纸本)9786197603743

The study addresses a challenge in planetary exploration, focusing on landslide susceptibility on the Lunar South Pole Region (LSPR), fundamental for future lunar missions. Features like permanently shadowed regions and water ice deposits attract scientific attention but issues related to rugged terrain and dynamic geological processes must also to be considered. The photointerpretation of data from Lunar Reconnaissance Orbiter (LRO) mission, allowed to create a landslides inventory map. The Frequency Ratio (FR) model was applied to generate a landslide susceptibility map (LSM). Geological and morphological factors were derived from existing maps and LRO data. Peak Ground Acceleration (PGA) variation and epicentral distance were used to define seismic hazard zones. LSM accuracy was evaluated using the Area Under the Curve (AUC) method. The study allows to identify geological formations susceptible to seismic-induced landslides, aiding site selection for future lunar missions. This interdisciplinary approach integrates planetary geology, remote sensing, and GIS software and it contributes to lunar exploration and exploitation for scientific and resource purposes allowing to optimize the Moon involvement in solar system exploration. © 2024 International Multidisciplinary Scientific Geoconference. All rights reserved.

关键词： Jurassic

来源：评论

学校读者我要写书评

暂无评论

Universal nanocomposite coating with antifouling and redox capabilities for electrochemical affinity biosensing in complex biological fluids

引用

Nanoscale Horizons 2024年第5期9卷 843-852页

作者： Bharti, Aditya Manu Rakesh Kumar, R.K. Chuang, Cheng-Hsin Shaikh, Muhammad Omar International PhD Program for Science National Sun Yat-sen University Kaohsiung80424 Taiwan Institute of Medical Science and Technology National Sun Yat-sen University Kaohsiung80424 Taiwan Department of Chemical Engineering National Taiwan University Taipei City10617 Taiwan Institute of Biomedical Engineering and Nanomedicine National Healthcare Research Institutes Miaoli County350 Taiwan National Sun Yat-sen University Kaohsiung80424 Taiwan Sustainability Science and Management Program Tunghai University Taichung407224 Taiwan

Electrochemical affinity biosensors have the potential to facilitate the development of multiplexed point-of-care diagnostics in complex biological fluids. However, their commercial viability has been hindered by challenges such as electrode biofouling and the lack of inherent redox properties. To address this unmet need, we have developed a universal nanocomposite coating which is unique in its ability to not only allow oriented conjugation of the biorecognition element but also specific detection directly in complex biological fluids like serum and urine owing to its built-in antifouling and redox capabilities, thus improving suitability for point of care testing. This multifunctional coating comprises a 3D porous crosslinked bovine serum albumin matrix for oriented conjugation and antifouling properties with embedded graphene nanosheets modified with amino-ferrocene for enhanced conductivity and mediator-free biosensing. The coating showed minimal signal degradation despite prolonged exposure to 1% bovine serum albumin, artificial urine and untreated human serum for up to 30 days. To demonstrate its utility, we fabricated and tested proof-of-concept electrochemical immunosensors for bladder cancer protein biomarkers, specifically interleukin-8 (IL-8) and vascular endothelial growth factor (VEGF). The practical feasibility was highlighted by the excellent sensitivity and specificity observed for IL-8 and VEGF with a limit of detection of 41 pg mL−1 and 67 pg mL−1, respectively. Consequently, this universal nanocomposite-based electrochemical biosensing platform can be extended to the point of care testing of a broad spectrum of biomarkers present in complex biological fluids, thus enabling reliable and early diagnostics. © 2024 The Royal Society of Chemistry

关键词： Biomarkers

来源：评论

学校读者我要写书评

暂无评论

Assessing Heat Vulnerability in Ho Chi Minh City: Insights from Local Climate Zones and the Heat Vulnerability Index Model 5

Assessing Heat Vulnerability in Ho Chi Minh City: Insights f...

引用

Land Surface and Cryosphere Remote Sensing V 2024

作者： Pham, Chi Cuong Lin, Tang-Huang International Master of Science Program in Remote Sensing Science and Technology Center for Space and Remote Sensing Research National Central University Taoyuan32001 Taiwan Center for Space and Remote Sensing Research National Central University Taoyuan32001 Taiwan

ISBN: (数字)9781510682696

ISBN: (纸本)9781510682689

In the context of increasing climate change and rapid urban expansion in Ho Chi Minh City, rising temperatures pose significant heat stress and health risks to residents. Assessing heat vulnerability is crucial for improving thermal comfort and achieving sustainable urban development. However, there is limited research on heat vulnerability within Local Climate Zones (LCZs), which are essential for understanding the relationship between urban form and heat exposure. This study integrates the Heat Vulnerability Index (HVI) with LCZ analysis to evaluate heat vulnerability across the city. Data were sourced from Landsat 8 to calculate Land Surface Temperature (LST), the Enhanced Normalized Difference Impervious Surfaces Index (ENDISI), the Modified Normalized Difference Water Index (MNDWI), and for LCZ classification using a random forest algorithm;LandScan for population density;OpenStreetMap for road and medical facility density;and VIIRS for nighttime lighting. The HVI model combines exposure (represented by Land Surface Temperature), sensitivity (calculated as an average of population density, road density, and ENDISI), and adaptability (calculated as an average of nighttime lighting, medical facilities, and MNDWI). The results show that built LCZs have significantly higher thermal exposure, sensitivity, and adaptability compared to natural LCZs. Greater vulnerability was observed in urbanized areas, with LCZ1 and LCZ2 having the highest HVI scores, and over 90% of their areas classified as highly vulnerable. Additionally, 158 out of 315 wards had HVI values exceeding 60%, with most located in urban areas. Notably, rural wards such as Pham Van Coi, Cu Chi, and Hoa Phu were identified as particularly vulnerable and in need of immediate attention. In conclusion, integrating LCZ and HVI provides key insights into heat vulnerability patterns, helping future studies optimize the spatial layouts of local climate zones to mitigate heat impacts and improve the urban therma

关键词： Health risks

来源：评论

学校读者我要写书评

暂无评论

Hypergravity influences mouse erythrocyte membrane lipid composition and antioxidant potential

引用

Acta Astronautica 2025年 234卷 99-105页

作者： Rizzo, Angela Maria Murgia, Giampaolo Lentini, Antonio Zava, Stefania Ferranti, Francesca Tavella, Sara Santucci, Daniela van Loon, Jack J.W.A. Colombo, Irma Corsetto, Paola Antonia Department of Pharmacological and Biomolecular Sciences University of Milan Italy University of Trento Department of Physics National PhD in Space Science and Technology Italy Italy Department of Experimental Medicine University of Genoa Italy IRCCS Ospedale Policlinico San Martino Genova Italy Rome Italy ESA-ESTEC-European Space Agency Technology and Research Centre TEC-NMG Lis Lab Noordwijk Netherlands Vrije Universiteit Amsterdam Netherlands

To support safe human space exploration, it is important to understand how different effectors, including gravitational forces, influence living organisms. Indeed, altered levels of gravity affect the physiological function of multiple cells, tissues, and organs in living organisms. Previous studies suggested that microgravity modifies plasma membrane permeability and cellular metabolism in erythrocyte, modifying cholesterol and phospholipid levels. However, to support human safe space exploration, it is also relevant to understand the effects of hypergravity. Therefore, the aim of this study was to investigate in vivo the impact of hypergravity on lipid phenotype and oxidative stress in mouse erythrocytes. Animals were housed in the Italian space Agency's Mice Drawer System (MDS-ASI), a facility designed to house rodents on the International space Station (ISS) and adapted by Thales Alenia space to the Large Diameter Centrifuge (LDC-ESA), to expose mice to a 3×g environment for 14 days. After exposure, a tissue-sharing protocol allowed us to purify and analyze erythrocytes. Our results show that the exposure of mice to altered gravity induced the reduction of unsaturation degree in erythrocyte membranes correlated to a lower stearoyl-CoA desaturase (SCD-1) activity. Moreover, the hypergravity induced both a decline in antioxidant defences, indicated by the significant decrease in total glutathione, and a grow of the inflammatory status, supported by an increase in the AA/EPA ratio. © 2025 The Authors

关键词： Mammals

来源：评论

学校读者我要写书评

暂无评论

A hybrid approach to real-time multi-target tracking

引用

Neural Computing and Applications 2024年第17期36卷 10055-10066页

作者： Scarrica, Vincenzo M. Panariello, Ciro Ferone, Alessio Staiano, Antonino National PhD Program in AI – Agrifood and Environment University of Naples Federico II Corso Umberto I 40 Campania Naples80138 Italy Department of Science and Technology University of Naples Parthenope Centro Direzionale Isola C4 Campania Naples80143 Italy

Multi-Object Tracking, also known as Multi-Target Tracking, is an important area of computer vision with various applications in different domains. The advent of deep learning has had a profound impact on this field, forcing researchers to explore innovative avenues. Deep learning methods have become the cornerstone of today's state-of-the-art solutions, consistently delivering exceptional tracking results. However, the significant computational demands of deep learning models require powerful hardware resources that do not always match real-time tracking requirements, limiting their practical applicability in real-world scenarios. Thus, there is an imperative to strike a balance by merging robust deep learning strategies with conventional approaches to enable more accessible, cost-effective solutions that meet real-time requirements. This paper embarks on this endeavor by presenting a hybrid strategy for real-time multi-target tracking. It effectively combines a classical optical flow algorithm with a deep learning architecture tailored for human crowd tracking systems. This hybrid approach achieves a commendable balance between tracking accuracy and computational efficiency. The proposed architecture, subjected to extensive experimentation in various settings, demonstrated notable results, achieving a Mean Object Tracking Accuracy (MOTA) of 0.608. This level of performance placed it as the highest ranking solution on the MOT15 benchmark, surpassing the state-of-the-art benchmark of 0.549, and consistently ranked among the superior models on the MOT17 and MOT20 benchmarks. Additionally, the incorporation of the optical flow phase resulted in a substantial reduction in processing time, nearly halving the duration, while simultaneously maintaining accuracy levels comparable to established techniques. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Real time systems

来源：评论

学校读者我要写书评

暂无评论

DEEP LEARNING-BASED APPROACH FOR ANNUAL CHANGE DETECTION AND OPEN PIT COAL MINE DETECTION USING SATELLITE IMAGERY 44

DEEP LEARNING-BASED APPROACH FOR ANNUAL CHANGE DETECTION AND...

引用

44th Asian Conference on Remote Sensing, ACRS 2023

作者： Prasetya, Koni Dwi Tsai, Fuan International PhD Program in Environmental Science and Technology National Central University 300 Jhongda Rd. Jhongli Taoyuan32001 Taiwan Center for Space and Remote Sensing Research National Central University 300 Jhongda Rd. Jhongli Taoyuan32001 Taiwan

ISBN: (纸本)9781713893646

This study introduces a novel deep learning-based method for detecting open pit coal mines in medium high (MH)resolution satellite imagery and analyzing annual variations in coal mining areas. The study aims to monitor and precisely identify coal mines, given their vital function as a primary energy source and a significant contributor to greenhouse gas emissions. The proposed method employs the U-Net architecture and ResNet 34 as its backbone for accurate detection and classification. The applied dataset consists of multispectral imagery from Sentinel-2 and synthetic aperture radar (SAR) imagery from Sentinel-1. Manual labelling of known coal mine locations using mining data as a reference, subdividing Sentinel image patches for training U-Net convolutional neural networks (CNNs) to classify coal mine and non-coal mine areas, and training and testing U-Net architecture and ResNet as a backbone deep learning model are the three essential steps involved in the process. The classification accuracy of the coal mining detection deep learning model is 97%, and the kappa value is 0.91. Preliminary results indicate that the investigation demonstrates the evolution of coal mining from 2016 to 2021, with an increase of over 40% in coal mining area in 2019. In 2017 and 2020, the area mined for coal will decrease. Variations in annual coal mining variations emphasize the significance of replanting efforts. The proposed method uses deep learning and satellite imagery to provide an accurate and efficient solution for detecting and monitoring open-pit coal mines. Incorporating artificial intelligence into dynamic coal mining activities yields valuable insights that aid in making informed decisions for sustainability. © 2023 ACRS. All Rights Reserved.

关键词： Artificial Intelligence Coal Mine Deep Learning Monitoring Multispectral SAR Sentinel Supervised Classification U-Net

来源：评论

学校读者我要写书评

暂无评论

space as a Zone of Peace: Envisioning a Resolution for the Demilitarization of Outer space 22

Space as a Zone of Peace: Envisioning a Resolution for the D...

引用

22nd IAA Symposium on Security, Stability and Sustainability of space Activities at the 75th International Astronautical Congress, IAC 2024

作者： El-Shawa, Sahba Link, A.J. Rotola, Giuliana Palestine Space Institute Palestine Department of Science Technology and Society PhD SDC Program IUSS Pavia Italy Howard University School of Law WashingtonDC United States Sant'Anna School of Advanced Studies Pisa Italy

ISBN: (纸本)9798331312374

The Outer space Treaty of 1967, which forms the basis of international space law, prohibits the placement of nuclear weapons and weapons of mass destruction in space and limits the use of the Moon and other celestial bodies to peaceful purposes. Despite these provisions, the treaty does not prohibit the placement of conventional weapons in orbit, and the potential for space to become weaponized remains a significant concern. Recent advancements in space technology and the increasing capabilities of various nations to operate in space have brought the issue to the forefront of international discussions. The development of anti-satellite weapons, the militarization of space infrastructure, and the potential deployment of weaponized platforms in orbit are developments that necessitate a reevaluation of existing treaties and the formulation of new agreements to ensure space remains a zone of peace. Acknowledging that the ideal solution - a new comprehensive treaty - presents significant diplomatic and practical challenges, this project adopts a pragmatic approach. It aims to lay the groundwork for such an ambitious goal through incremental steps, beginning, as an example, with developing a draft resolution. This initial step is envisioned as a catalyst for international dialogue and cooperation, setting the stage for more extensive agreements in the future. By focusing on achievable milestones, such as consensus-building activities, confidence-building measures, and the establishment of a common understanding of the importance of space for humanity's collective future, this project seeks to navigate the complex political and technical terrain towards the ultimate objective of a demilitarized outer space. Copyright © 2024 by Ms. Sahba El-Shawa.

关键词： Orbits

来源：评论

学校读者我要写书评

暂无评论

Recent advances in nanomaterials-based optical sensors for detection of various biomarkers (inorganic species, organic and biomolecules)

引用

Luminescence 2023年第7期38卷 954-998页

作者： Harshita Wu, Hui-Fen Kailasa, Suresh Kumar Department of Chemistry Sardar Vallabhbhai National Institute of Technology Gujarat Surat India Department of Chemistry National Sun Yat-Sen University Kaohsiung Taiwan School of Pharmacy College of Pharmacy Kaohsiung Medical University Kaohsiung Taiwan Institute of Medical Science and Technology National Sun Yat-Sen University Kaohsiung Taiwan International PhD Program for Science National Sun Yat-Sen University Kaohsiung Taiwan

This review briefly emphasizes the different detection approaches (electrochemical sensors, chemiluminescence, surface-enhanced Raman scattering), functional nanostructure materials (quantum dots, metal nanoparticles, metal nanoclusters, magnetic nanomaterials, metal oxide nanoparticles, polymer-based nanomaterials, and carbonaceous nanomaterials) and detection mechanisms. Furthermore, the emphasis of this review is on the integration of functional nanomaterials with optical spectroscopic techniques for the identification of various biomarkers (nucleic acids, glucose, uric acid, oxytocin, dopamine, ascorbic acid, bilirubin, spermine, serotonin, thiocyanate, Pb2+, Cu2+, Hg2+, F−, peptides), and cancer biomarkers (mucin 1, prostate specific antigen, carcinoembryonic antigen, CA15-3, human epidermal growth factor receptor 2, C-reactive protein, and interleukin-6). Analytical characteristics of nanomaterials-based optical sensors are summarized in the tables, providing the insights of nanomaterials-based optical sensors for biomarkers detection. Finally, the opportunities and challenges of nanomaterials-based optical analytical approaches for the detection of various biomarkers (inorganic, organic, biomolecules, peptides and proteins) are discussed. © 2022 John Wiley & Sons Ltd.

关键词： Biomarkers

来源：评论

学校读者我要写书评

暂无评论

Direct measurement of Ne-Mg-Si nuclei in cosmic rays with DAMPE 38

Direct measurement of Ne-Mg-Si nuclei in cosmic rays with DA...

引用

38th International Cosmic Ray Conference, ICRC 2023

作者： Casilli, Elisabetta Altomare, Corrado Bernardini, Paolo de Palma, Francesco Ghose, Essna Surdo, Antonio Dipartimento di Matematica e Fisica E. De Giorgi Università del Salento LecceI-73100 Italy Sezione di Lecce LecceI-73100 Italy Sezione di Bari BariI-70125 Italy National PhD Program in Space Science and Technology University of Trento Italy

A precise measurement of the cosmic-ray spectra provides important information on their origin, acceleration and propagation processes in the Galaxy. The Dark Matter Particle Explorer (DAMPE) is a satellite-based cosmic-ray experiment that has been operational for more than 7 years. Since its launch in December 2015, it is continuously collecting data on high-energy cosmic particles with very good statistics and particle identification capabilities, thanks to a large geometric factor and a good charge resolution. In this contribution, the direct measurement of the intermediate mass cosmic rays is presented, in particular the observation of the cosmic-ray Ne, Mg and Si nuclei, which are thought to be mainly produced and accelerated in astrophysical sources. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic ray measurement

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：