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Nonlinear Model Predictive Controller for Compensations of Single Line-to-ground Fault in Resonant Grounded Power Distribution Networks

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1113-1125页

作者： Warnakulasuriya Sonal Prashenajith Fernando Mostafa Barzegar-Kalashani Md Apel Mahmud shama Naz Islam Nasser Hossenzadeh Faculty of Engineering and Environment Northumbria UniversityNewcastleUK School of Software and Electrical Engineering Swinburne University of TechnologyHawthornAustralia School of Engineering Deakin UniversityWaurn PondsAustralia

An nonlinear model predictive controller(NMPC)is proposed in this paper for compensations of single line-to-ground(SLG)faults in resonant grounded power distribution networks(RGPDNs),which reduces the likelihood of power line bushfire due to electric *** current compensation(RCC)inverters with arc suppression coils(ASCs)in RGPDNs are controlled using the proposed NMPC to provide appropri-ate compensations during SLG *** proposed NMPC is incorporated with the estimation of ASC inductance,where the estimation is carried out based on voltage and current measure-ments from the neutral point of the power distribution *** compensation scheme is developed in the discrete time using the equivalent circuit of *** proposed NMPC for RCC inverters ensures that the desired current is in-jected into the neutral point during SLG faults,which is veri-fied through both simulations and control hardware-in-the-loop(CHIL)*** results are also presented against an integral sliding mode controller(ISMC)by demon-strating the capability of power line bushfire mitigation.

关键词： Fault current phase voltage nonlinear model predictive controller(NMPC) parameter adaptation parametric uncertainty power line bushfire

Unraveling the nature of sensing in electrostatic MEMS gas sensors

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Microsystems & Nanoengineering 2024年第3期10卷 109-117页

作者： Yasser S.shama Sasan Rahmanian Hamza Mouharrar Rana Abdelrahman Alaaeldin Elhady Eihab M.Abdel-Rahman Systems Design Engineering University of Waterloo200 University Ave WWaterloo N2L 3G1 ONCanada Mechanical Engineering Benha Faculty of EngineeringBenha UniversityBenha 13511Egypt

This paper investigates the fundamental sensing mechanism of electrostatic MEMS gas *** compares among the responsivities of a set of MEMS isopropanol sensors before and after functionalization,and in the presence and absence of electrostatic fields when operated in static and dynamic detection *** the static mode,we found that the sensors do not exhibit a measurable change in displacement due to added *** the other hand,bare sensors showed a clear change in displacement in response to isopropanol *** the dynamic mode,functionalized sensors showed a measurable frequency shift due to the added mass of isopropanol *** the presence of strong electrostatic fields,the measured frequency shift was found to be threefold larger than that in their absence in response to the same concentration of isopropanol *** enhanced responsivity of dynamic detection allows the sensors to measure the vapor mass captured by the functional material,which is not the case for static *** detection of isopropanol by bare sensors in static mode shows that change in the medium permittivity is the primary sensing *** enhanced responsivity of dynamic mode sensors when operated in strong electrostatic fields shows that their sensing mechanism is a combination of a weaker added mass effect and a stronger permittivity *** findings show that electrostatic MEMS gas sensors are independent of the direction of the gravitational field and are,thus,robust to changes in *** is erroneous to refer to them as‘gravimetric’sensors.

关键词： mechanism electrostatic measurable

The Lambert-G Family:Properties,Inference,and Applications

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 513-536页

作者： Jamal N.Al Abbasi Ahmed Z.Afify Badr Alnssyan Mustafa S.shama Accounting Department Ashur UniversityBaghdad10011Iraq Department of Statistics Mathematics and InsuranceBenha UniversityBenha13511Egypt Department of Management Information Systems and Production Management College of Business and EconomicsQassim UniversityBuraydah51452Saudi Arabia Department of Basic Sciences Common First Year(CFY)King Saud UniversityRiyadh11362Saudi Arabia Department of Mathematics and Statistics Osim Higher Institute of Administrative ScienceOsim12961Egypt

This study proposes a new flexible family of distributions called the Lambert-G *** Lambert family is very flexible and exhibits desirable *** three-parameter special sub-models provide all significantmonotonic and non-monotonic failure rates.A special sub-model of the Lambert family called the Lambert-Lomax(LL)distribution is *** expressions for the LL statistical properties are *** of the LL distribution are addressed mathematically based on its hazard *** estimation of the LL parameters is discussed using six estimation *** performance of this estimation method is explored through simulation *** usefulness and flexibility of the LL distribution are demonstrated empirically using two real-life data *** LL model better fits the exponentiated Lomax,inverse power Lomax,Lomax-Rayleigh,power Lomax,and Lomax distributions.

关键词： Lambert function Lomax distribution maximum likelihood hazard function statistical model simulation

Open label,interventional,single arm multicentric clinical study to analyze the potency of VELNEZ nasal pack,post-nasal surgery

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2024年第3期10卷 180-186页

作者： shama Bellad Nagula Parusharam Vineeta Dhyani Pankaj Bablani Siddharth Pandey Department of ENT Jawaharlal Nehru Medical CollegeBelagaviKarnatakaIndia Department of ENT Mahatma Gandhi Memorial HospitalWarangalTelanganaIndia Department of Pharmacy Practice KLE UniversityBelagaviKarnatakaIndia Datt Mediproducts Pvt.Ltd. New DelhiIndia

Background:Nasal packs are central to nasal ***,these packs function by controlling bleeding,modulating pain and reducing adhesions ***,the major setback of the currently used conventional nasal packs is the unbearable pain the patient undergoes upon removal of these *** overcome this shortcoming a variety of biodegradable packs have *** study was aimed at evaluating the safety,efficacy and tolerability of VELNEZ nasal ***,a patented Datt Mediproducts *** pack,is one of its kind biodegradable composite that fragments within a few days of ***:Eighty patients were included in an open label,interventional,single arm clinical study using clinical endpoints to investigate the safety and efficacy of nasal pack *** patients were questioned using a visual analog scale from discharge day to 28th postoperative day(9 follow-up visits)at regular *** standardized questionnaires for hemorrhage control,relief from postoperative pain,moderate obstruction,and pain were ***:A total of 76 patients were enrolled in the study and 74 patients completed the *** nasal pack played a significant role in controlling hemorrhage and reducing postoperative *** average hemorrhage control time was 7.49±3.90 min with only 34.24%of population complaining of pain on the sixth day of surgery(follow-up 4).Forteen days postsurgery only 10.95%of subject population complained of postoperative *** biodegradable composite has an average fragmentation time of 4.7 days in the nasal *** addition,this study did not observe any postoperative adverse events or serious adverse ***:VELNEZ,a fragmentable nasal pack,is comfortable,safe,and effective against postsurgery bleeding and pain.

关键词： clinical trial registry fragmentable functional endoscopic sinus surgery visual analog scale

Mechanism of Anti-tumor Effects of Viola Medicinal Materials Based on Network Pharmacology and Molecular Docking

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Medicinal Plant 2024年第3期15卷 9-15页

作者： Xiaoyong HE Liniu shama Dongmei SHA Shuaicong NI Jing WEN Xinjia YAN Yuan LIU College of Pharmacy Southwest Minzu UniversityChengdu 610041China Sichuan Provincial Qiang-Yi Medicinal Resources Protection and Utilization Technology Engineering Laboratory Chengdu 610225China Tibetan Plateau Ethnic Medicinal Resources Protection and Utilization Key Laboratory of National Ethnic Affairs Commission of the People's Republic of China Chengdu 610225China School of Pharmacy Sichuan College of Traditional Chinese MedicineMianyang 621000China

[Objectives]To explore the relationship between anti-tumor components,targets,and pathways involved in Viola medicinal materials,study its main active components,and evaluate its inhibitory activity.[Methods]Through network pharmacological analysis,molecular docking simulation experiments and in vitro experiments,the main components and corresponding targets of Viola were screened out,and their anti-tumor signaling pathways were *** colorimetric assay was used to investigate the inhibitory effect of different extraction layers of Viola on the growth of tumor cells.[Results]18 anti-tumor active components such as 2α,19α-Dihydroxyursolic acid,Corlumine,Madolin U,Trifolirhizin and etc.,and 52 action targets such as PTGS2,PTGS1,P2RX7,MMP1,and GABRB3,and anti-tumor signaling pathways were *** results of molecular docking showed that all the selected Viola compounds had good binding *** results of MTT colorimetric assay showed that the petroleum ether layer and n-butanol layer had a good inhibitory effect on the growth of tumor cell lines.[Conclusions]Viola medicinal materials have the potential of anti-tumor,triterpenoids and flavonoids may be the main active components,and the petroleum ether layer and n-butanol layer have better inhibitory effect on the growth of tumor cells.

关键词： Viola medicinal materials Anti-tumor Network pharmacology Molecular docking MTT

面向小麦种植面积反演的自监督学习光谱解混算法

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遥感学报 2024年第9期28卷 2405-2415页

作者：胡金龙段金亮沙马阿各张瑞西南交通大学地球科学与环境工程学院测绘遥感信息系成都611756 西南石油大学土木工程与测绘学院成都610500 西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室成都611756

遥感作为大范围地表覆盖提取和时空动态监测的有力工具,在小麦种植面积反演领域具有显著优势。然而,混合像元现象限制了小麦种植面积估计的精度,端元的光谱变异性现象也使得传统的混合像元分解方法表现不佳。针对小麦种植面积估计过程... 详细信息

遥感作为大范围地表覆盖提取和时空动态监测的有力工具,在小麦种植面积反演领域具有显著优势。然而,混合像元现象限制了小麦种植面积估计的精度,端元的光谱变异性现象也使得传统的混合像元分解方法表现不佳。针对小麦种植面积估计过程中存在的混合像元和端元光谱变异性等问题,本文提出基于自监督学习的光谱解混算法SLSU(Self-supervised Learning-based Spectral Unmixing Algorithm)。首先,使用变分自编码器实现无监督的端元光谱变异性解释和端元库生成;然后,使用交替最小二乘法和全约束最小二乘模型估计各类端元对应的丰度;最后,利用概率松弛标记法对解混结果进行空间邻域校正,以进一步提高光谱解混和小麦面积估计的精度。以河南省新乡市3个典型的小麦种植区为实验区,利用Sentinel-2影像获取小麦种植面积并利用实地测量的小麦分布现状数据计算提取精度。结果表明:基于SLSU算法获取的小麦种植面积的相对提取误差中位数<1.3个像素,显著优于全约束最小二乘、扩展线性混合模型等传统混合像元分解算法以及支持向量机、随机森林等监督学习分类方法所提结果。所提SLSU算法可以提高小麦提取的精度和稳定性,为农作物分布提取和种植面积估算提供了有效的方法。

关键词：遥感自监督学习变分自编码器混合像元分解地物提取作物面积估计

Site specific probabilistic seismic hazard analysis at Dubai Creek on the west coast of UAE

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Earthquake Engineering and Engineering Vibration 2011年第1期10卷 143-152页

作者： Ayman A. shama Parsons Corporation 100 Broadway New York NY 10005 USA

A probabilistic seismic hazard analysis （PSHA） was conducted to establish the hazard spectra for a site located at Dubai Creek on the west coast of the United Arab Emirates （UAE）. The PSHA considered all the seismogenic sources that affect the site, including plate boundaries such as the Makran subduction zone, the Zagros fold-thrust region and the transition fault system between them; and local crustal faults in UAE. PSHA indicated that local faults dominate the hazard. The peak ground acceleration （PGA） for the 475-year return period spectrum is 0.17 g and 0.33 g for the 2,475-year return period spectrum. The hazard spectra are then employed to establish rock ground motions using the spectral matching technique.

关键词： seismic hazard PSHA subduction zone rock ground motion spectral matching logic tree fault

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彝族选美文化的传承与变迁研究

西昌学院学报（社会科学版） 2024年第1期36卷 55-61页

作者：沙马打各徐伟彦西昌学院彝族文化研究中心深圳传音控股股份有限公司

以彝族选美文化为研究对象,探究彝族选美的起源和类型,分析传统选美标准、选美形式和选美的社会功能,在外来选美文化和政府“文化搭台、经济唱戏”理念的影响下,选美文化的社会功能和文化价值弱化而逐渐失去特色。火把节选美应尊重传统... 详细信息

以彝族选美文化为研究对象,探究彝族选美的起源和类型,分析传统选美标准、选美形式和选美的社会功能,在外来选美文化和政府“文化搭台、经济唱戏”理念的影响下,选美文化的社会功能和文化价值弱化而逐渐失去特色。火把节选美应尊重传统选美文化、借鉴现代选美方式,同时政府给予相应的扶持。

关键词：彝族选美火把节传承与变迁

Achieving Energy Efficiency in Wireless Sensor Networks Using Dynamic Channel Polling and Packet Concatenation

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China Communications 2021年第8期18卷 249-270页

作者： shama Siddiqui Anwar Ahmed Khan Sayeed Ghani Department of Computer Science DHA Suffa UniversityKarachiPakistan Department of Computer Science Institute of Business AdministrationKarachiPakistan Department of Computer Science Sindh Institute of Management&TechnologyKarachiPakistan

There has been a significant interest of researchers to combine different schemes focused on optimizing energy performance while developing aMAC protocol for Wireless Sensor Networks(WSNs).In this paper,we propose to integrate two cross-layer schemes:dynamic channel polling and packet concatenation using a recent asynchronous MAC protocol“Adaptive&Dynamic Polling MAC”(ADPMAC).ADP-MAC dynamically selects the polling interval distribution based on characterization of incoming traffic patterns using Coefficient of variation(CV).Packet Concatenation(PC)refers to combining the individually generated data packets into a single super packet and sending it at the polling ***,the Block Acknowledgement(BA)scheme has been developed for ADP-MAC to work in conjunction with the packet *** proposed schemes have been implemented in Tiny-OS for Mica2 platform and Avrora emulator has been used for conducting *** results have revealed that the performance both in terms of energy&packet loss improves when ADP-MAC is used in conjunction with the additional features of PC&***,the proposed scheme has been compared with a stateof-art packet concatenation primitive PiP(Packet-in-Packet).It has been observed that ADP-MAC supersedes the performance of PiP in terms of PDR(Packet Delivery Ratio)due to better management of synchronization between source and sink.

关键词： energy efficiency concatenation dynamic polling