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应用于高压直流电网充电启动的混合式直流断路器

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全球能源互联网 2018年第4期1卷 430-436页

作者：王国英 arman hassanpoor 邓娜 Vinothkumar K ABB(中国)有限公司北京市朝阳区100015 ABBGISPL

近年来高压直流(high-voltage direct current,HVDC)输电技术,尤其是基于电压源换流器(voltage source converters,VSC)的直流输电技术在电力传输中的应用得到飞速发展,由此推动发展的直流电网概念,呈现出与传统交流输电系统相辅相成的... 详细信息

近年来高压直流(high-voltage direct current,HVDC)输电技术,尤其是基于电压源换流器(voltage source converters,VSC)的直流输电技术在电力传输中的应用得到飞速发展,由此推动发展的直流电网概念,呈现出与传统交流输电系统相辅相成的趋势。建立可靠的直流电网,必然需要能将直流故障隔离的设备,例如混合式高压直流断路器(hybrid HVDC Breaker,HHB)。HHB可以隔离系统中的短时或永久故障。此外,基于模块化设计的HHB及其智能控制系统,应用顺序合闸控制功能可以辅助直流线路故障后的重启过程,同时可以借助此功能消除换流器启动过程中因子模块充电而引发的涌流问题,从而替代直流启动电阻(pre-insertion resistor,PIR)。介绍了混合式高压直流断路器(HHB)的模块化设计概念和换流器充电过程中HHB的时序逻辑,并在PSCAD中搭建了多端直流电网模型,仿真验证了HHB分级顺序合闸逻辑的合理性,通过对比充电过程的换流器各电气量变化验证了所提出方法对系统性能的显著改善。提出的方法为实现高压直流电网的高效经济运行提供了解决方案。

关键词：高压直流电网充电启动电阻(PIR) 混合式高压直流断路器(HHB) 分级顺序合闸

Using satellite-derived land surface temperatures to clarify the spatiotemporal warming trends of the Alborz Mountains in northern Iran

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Journal of Mountain Science 2024年第2期21卷 449-469页

作者： ROSHAN Gholamreza SARLI Reza GHANGHERMEH Abdolazim TAHERIZADEH Mehrnoosh NIKNAM arman Department of Geography Golestan UniversityGorgan 49138-15759Iran Department of Forest Resources Management Faculty of ForestryUniversity of Agriculture in KrakowAL.29 Listopada 4631-425 KrakówPoland Department of Geoinformatics Physical and Environmental GeographyUniversity of SzegedSzeged 6722Hungary

The Alborz Mountains are some of the highest in Iran,and they play an important role in controlling the climate of the country’s northern *** land surface temperature(LST)is an important variable that affects the ecosystem of this *** study investigated the spatiotemporal changes and trends of the nighttime LST in the western region of the Central Alborz Mountains at elevations of 1500-4000 m above sea *** data were extracted for the period of 2000-2021,and the Mann-Kendall nonparametric test was applied to evaluating the changes in the *** results indicated a significant increasing trend for the monthly average LST in May-August along the southern *** the northern and southern aspects showed decreasing trends for the monthly average LST in October,November,and March and an increasing trend in other *** all elevations,the average decadal change in the monthly average LST was more severe along the southern aspect(0.60°C)than along the northern aspect(0.37°C).The LST difference between the northern and southern aspects decreased in the cold months but increased in the hot *** the same elevation,the difference in the lapse rate between the northern and southern aspects was greater in the hot months than in the cold *** increasing elevation,the lapse rate between the northern and southern aspects *** change was concluded to greatly decrease the difference in LST at different elevations for April-July.

关键词： Global warming Mountainous areas Lapse rate Surface air temperatures Alborz

Targeted delivery of factors and cells for improving cardiac tissue regeneration and heart function following myocardial infarction

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Engineered Regeneration 2024年第2期5卷 210-227页

作者： Kamila Raziyeva Zharylkasyn Zharkinbekov Yevgeniy Kim arman Saparov School of Medicine Nazarbayev UniversityAstana 010000Kazakhstan

Following myocardial infarction(MI),cardiac tissue undergoes irreversible cellular alterations,with cardiomy-ocytes being replaced by fibrotic *** order to improve tissue regeneration,a previously characterized chitosan-based cryogel,which was designed by our group,was *** treatment regimen involved the sequen-tial delivery of the cryogel loaded with specific cytokines and growth factors,followed by a separate injection of pre-differentiated ***,the cryogel loaded with interleukin-10 and transforming growth factor-βwas injected into infarcted tissue immediately after MI induction,targeting the acute inflammatory *** day four post-MI,a second injection was administered,this time utilizing cryogel loaded with vascular endothelial growth factor and fibroblast growth factor-2,aimed at promoting tissue regeneration and ***-quently,on day six post-MI,the experimental group received cardiomyocyte-like cells,smooth muscle cells,and endothelial *** purpose of these cells,in synergy with cytokines and growth factors,was to repopulate the lost cellular populations,thereby enhancing myocardial *** treatment improved myocardial tissue regeneration,increased cardiac output,ejection fraction,and reduced fibrotic ***,the chitosan-based cryogel,enriched with anti-inflammatory and proangiogenic factors and supplemented with pre-differentiated cells,offers a promising platform for controlled release of therapeutics,promoting substantial tissue repair and regeneration following MI.

关键词： Myocardial infarction Tissue regeneration Cryogel Growth factors Stem cells

A Comprehensive Survey for Privacy-Preserving Biometrics: Recent Approaches, Challenges, and Future Directions

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Computers, Materials & Continua 2024年第2期78卷 2087-2110页

作者： Shahriar Md arman Tao Yang Shahadat Shahed Alanoud AlMazroa Afraa Attiah Linda Mohaisen School of Computer Science and Technology Zhejiang Gongshang UniversityHangzhou310018China School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China College of Computer and Information Sciences Princess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Faculty of Computing and Information Technology King Abdulaziz UniversityJeddah21589Saudi Arabia

The rapid growth of smart technologies and services has intensified the challenges surrounding identity authenti-cation *** credentials are increasingly being used for verification due to their advantages over traditional methods,making it crucial to safeguard the privacy of people’s biometric data in various *** paper offers an in-depth exploration for privacy-preserving techniques and potential threats to biometric *** proposes a noble and thorough taxonomy survey for privacy-preserving techniques,as well as a systematic framework for categorizing the field’s existing *** review the state-of-the-art methods and address their advantages and limitations in the context of various biometric modalities,such as face,fingerprint,and eye *** survey encompasses various categories of privacy-preserving mechanisms and examines the trade-offs between security,privacy,and recognition performance,as well as the issues and future research *** aims to provide researchers,professionals,and decision-makers with a thorough understanding of the existing privacy-preserving solutions in biometric recognition systems and serves as the foundation of the development of more secure and privacy-preserving biometric technologies.

关键词： Biometric modalities biometric recognition biometric security privacy-preserving security threats

Global systematic review and meta-analysis of knowledge, attitudes, and practices towards dengue fever among the general population

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Asian Pacific Journal of Tropical Medicine 2024年第5期17卷 191-207,I0001-I0003页

作者： Abdolreza Sotoodeh Jahromi Mohammad Jokar arman Abdous Nader Sharifi Tahere Abbasi Vahid Rahmanian Zoonoses Research Center Jahrom University of Medical SciencesJahromIran Faculty of Veterinary Medicine Karaj BranchIslamic Azad UniversityKarajIran Department of Public Health Khomein University of Medical SciencesKhomeinIran Research Center for Social Determinants of Health Jahrom University of Medical SciencesJahromIran Department of Public Health Torbat Jam Faculty of Medical SciencesTorbat JamIran

Objective:To determine the global level of knowledge,attitudes,and practices towards dengue fever among the general ***:To complete this systematic review and meta-analysis,a thorough search for pertinent English-language literature was undertaken during the study's extension until October *** search used Google Scholar,Scopus,PubMed/MEDLINE,Science Direct,Web of Science,EMBASE,Springer,and ProQuest.A quality assessment checklist developed using a modified Newcastle-Ottawa Scale for the cross-sectional study was used to evaluate the risk of bias in the included *** variance and Cochran Q statistics were employed in the STATA software version 14 to assess study *** there was heterogeneity,the Dersimonian and Liard random-effects models were ***:59 Studies totaling 87353 participants were included in this *** investigations included 86278 participants in 55 studies on knowledge,20196 in 33 studies on attitudes,and 74881 in 29 studies on *** pooled estimates for sufficient knowledge,positive attitudes,and dengue fever preventive behaviors among the general population were determined as 40.1%(95%CI 33.8%-46.5%),46.8%(95%CI 35.8%-58.9%),and 38.3%(95%CI 28.4%-48.2%),*** exhibits the highest knowledge level at 63.5%,and Africa shows the lowest at 20.3%.Positive attitudes are most prevalent in the Eastern Mediterranean(54.1%)and Southeast Asia(53.6%),contrasting sharply with the Americas,where attitudes are notably lower at 9.05%.Regarding preventive behaviors,the Americas demonstrate a prevalence of 12.1%,Southeast Asia at 28.1%,Western Pacific at 49.6%,Eastern Mediterranean at 44.8%,and Africa at 47.4%.Conclusions:Regional disparities about the knowledge,attitude and preventive bahaviors are evident with Europe exhibiting the highest knowledge level while Africa has the *** findings emphasize the importance of targeted public health interventions tailored to regional

关键词： Break-bone fever Knowledge Attitudes Practices

Conceptual Strategy for Mitigating the Risk of Hydrogen as an Internal Hazard in Case of Severe Accidents at Nuclear Power Plant Considering Existing Risks and Uncertainties Associated with the Use of Traditional Strategies

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World Journal of Nuclear Science and Technology 2024年第3期14卷 165-177页

作者： arman Grigoryan Independent Researcher Los Angeles USA

Hydrogen challenge mitigation stands as one of the main objectives in the management of severe accidents at Nuclear Power Plants (NPPs). Key strategies for hydrogen control include atmospheric inertization and hydrogen removal with Passive Autocatalytic Recombiners (PARs) being a commonly accepted approach. However, an examination of PAR operation specificity reveals potential inefficiencies and reliability issues in certain severe accident scenarios. Moreover, during the in-vessel stage of severe accident development, in some severe accident scenarios PARs can unexpectedly become a source of hydrogen detonation. The effectiveness of hydrogen removal systems depends on various factors, including the chosen strategies, severe accident scenarios, reactor building design, and other influencing factors. Consequently, a comprehensive hydrogen mitigation strategy must effectively incorporate a combination of strategies rather than be based on one strategy, taking into consideration the probabilistic risks and uncertainties associated with the implementation of PARs or other traditional methods. In response to these considerations, within the framework of this research it has been suggested a conceptual strategy to mitigate the hydrogen challenge during the in-vessel stage of severe accident development.

关键词： Severe Accident Management Nuclear Power Plant Hydrogen Risk Mitigation Risk Management Passive Autocatalytic Recombiner

Percutaneous antegrade management of large proximal ureteral stones using non-papillary puncture

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Asian Journal of Urology 2024年第1期11卷 110-114页

作者： arman Tsaturyan Angelis Peteinaris Constantinos Adamou Konstantinos Pagonis Lusine Musheghyan Anastasios Natsos Theofanis Vrettos Evangelos Liatsikos Panagiotis Kallidonisa Department of Urology University of PatrasPatrasGreece Gerald and Patricia Turpanjian School of Public Health American University of ArmeniaYerevanArmenia Department of Anesthesiology and ICU University of PatrasPatrasGreece Department of Urology Medical University of ViennaViennaAustria

Objective:To evaluate the feasibility and the safety of medial non-papillary percutaneous nephrolithotomy(npPCNL)for the management of large proximal ureteral ***:We evaluated prospectively collected data of 37 patients with large proximal ureteral stones more than 1.5 cm in diameter treated by prone *** on stone size,in-toto stone removal or lithotripsy using the Lithoclast®Trilogy(EMS Medical,Nyon,Switzerland)was *** parameters including operative time(from start of puncture to the skin suturing),stone extraction time(from the first insertion of the nephroscope to the extraction of all stone fragments),and the stone-free rate were ***:Twenty-one males and 16 females underwent npPCNL for the management of large upper ureteral *** median age and stone size of treated patients were 58(interquartile range[IQR]:51-69)years and 19.3(IQR:18.0-22.0)mm,*** median operative time and stone extraction time were 25(IQR:21-29)min and 8(IQR:7-10)min,*** case(2.7%)of postoperative bleeding and two cases(5.4%)of prolonged fever were managed *** stone-free rate at a 1-month follow-up was 94.6%.Conclusion:The npPCNL provides a straight route to the ureteropelvic junction and proximal *** from a dilated portion of the ureter under low irrigation pressure with larger diameter instruments results in effective and safe stone extraction within a few minutes.

关键词： Antegrade percutaneous nephrolithotomy Proximal ureteral stone Non-papillary puncture Large ureteral stone Prone percutaneous nephrolithotomy

Numerical Study and Optimization of CZTS-Based Thin-Film Solar Cell Structure with Different Novel Buffer-Layer Materials Using SCAPS-1D Software

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Energy and Power Engineering 2024年第4期16卷 179-195页

作者： Md. Zamil Sultan arman Shahriar Rony Tota Md. Nuralam Howlader Hasibul Haque Rodro Mahfuja Jannat Akhy Md. Abir Al Rashik Department of Electrical and Electronic Engineering Hajee Mohammad Danesh Science and Technology University Dinajpur Bangladesh

This study explored the performances of CZTS-based thin-film solar cell with three novel buffer layer materials ZnS, CdS, and CdZnS, as well as with variation in thickness of buffer and absorber-layer, doping concentrations of absorber-layer material and operating temperature. Our aims focused to identify the most optimal thin-film solar cell structure that offers high efficiency and lower toxicity which are desirable for sustainable and eco-friendly energy sources globally. SCAPS-1D, widely used software for modeling and simulating solar cells, has been used and solar cell fundamental performance parameters such as open-circuited voltage (), short-circuited current density (), fill-factor() and efficiency() have been optimized in this study. Based on our simulation results, it was found that CZTS solar cell with Cd0.4Zn0.6S as buffer-layer offers the most optimal combination of high efficiency and lower toxicity in comparison to other structure investigated in our study. Although the efficiency of Cd0.4Zn0.6S, ZnS and CdS are comparable, Cd0.4Zn0.6S is preferable to use as buffer-layer for its non-toxic property. In addition, evaluation of performance as a function of buffer-layer thickness for Cd0.4Zn0.6S, ZnS and CdS showed that optimum buffer-layer thickness for Cd0.4Zn0.6S was in the range from 50 to 150nm while ZnS offered only 50 – 75 nm. Furthermore, the temperature dependence performance parameters evaluation revealed that it is better to operate solar cell at temperature 290K for stable operation with optimum performances. This study would provide valuable insights into design and optimization of nanotechnology-based solar energy technology for minimizing global energy crisis and developing eco-friendly energy sources sustainable and simultaneously.

关键词： Thin-Film Solar Cell CZTS Buffer-Layer Renewable Energy Green-House Gases Efficiency

Electrophoretic deposition of chitosan-bioglass^(■)-hydroxyapatite-halloysite nanotube composite coating

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Rare Metals 2022年第11期41卷 3850-3857页

作者： arman Molaei MardAli Yousefpour Department of Materials Engineering Tehran Science and Research BranchIslamic Azad UniversityTehran***Iran Faculty of Materials Science and Metallurgical Engineering Semnan UniversitySemnan***Iran

The composite coatings of chitosan(CS)-bioglass^(■)(BG)-hydroxyapatite(HA)-halloysite nanotube(HNT)were investigated and produced via electrophoretic deposition(EPD)*** utilization of CS as a dispersing,blending and charging agent for ceramic particles,including BG,HA and HNT,allowed the formation of CS-BG/HA/HNT composite,functionally graded composite(FGC)and bilayer film containing different *** results of scanning electron microscopy(SEM),energy-dispersive spectrometry(EDS),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR)illustrate the composite in the form of the optimum distribution of ceramic components in the CS matrix with thickness of 28μm on titanium(Ti)*** impedance spectroscopy(EIS)and potentiodynamic polarization tests indicate that the corrosion resistance of the coated sample increases in corrected simulated body fluid(C-SBF)at 37℃.Finally,the apatiteinducing ability of CS-BG-HA-HNT is proved by the formation of carbonated hydroxyapatite particles on composite coating in C-SBF.

关键词： Four-component coating Composites Biomaterials Electrophoretic deposition Corrosion