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A split target detection and tracking algorithm for ballistic missile tracking during the re-entry phase

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Defence Technology（防务技术） 2020年第6期16卷 1142-1150页

作者： Muhammad Asad sumair Khan Ihsanullah Zahid Mehmood Yifang Shi Sufyan Ali Memon Uzair Khan Department of Electrical and Computer Engineering COMSATS University IslamabadAbbottabad CampusPakistan Department of Computer Science COMSATS University IslamabadAbbottabad CampusPakistan Electrical Engineering Department Indus UniversityKarachiPakistan Department of Automation Hangzhou Dianzi UniversityXiasha Higher Education Zone2nd StreetHangzhou310018China

In the re-entry phase of a ballistic missile,decoys can be deployed as a mean to overburden enemy *** results in a single track being split into multiple *** of these track-lets is a critical task as any miss in the tracking procedure can become a cause of a major *** tracking process becomes more complicated in the presence of *** low detection rate is one of the factors that may contribute to increasing the difficulty level in terms of tracking in the cluttered *** work introduces a new algorithm for the split event detection and target tracking under the framework of the joint integrated probabilistic data association(JIPDA)*** proposed algorithm is termed as split event-JIPDA(SE-JIPDA).This work establishes the mathematical foundation for the split target detection and tracking *** performance analysis is made under different simulation conditions to provide a clear insight into the merits of the proposed *** performance parameters in these simulations are the root mean square error(RMSE),confirmed true track rate(CTTR)and confirmed split true track rate(CSTTR).

关键词： Split event probability JIPDA Data association Ballistic missile Estimation

Investigation on the process parameters of TIG-welded aluminum alloy through mechanical and microstructural characterization

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Defence Technology（防务技术） 2021年第4期17卷 1234-1248页

作者： Muhammad Samiuddin Jing-long Li Muhammad Taimoor Mohammad Nouman Siddiqui sumair Uddin Siddiqui Jiang-tao Xiong State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072PR China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical UniversityXi’an710072PR China Metallurgical Engineering Department NED University of Engineering and TechnologyKarachi75850Pakistan Department of Aeronautics and Astronautics Institute of Space TechnologyIslamabad44000Pakistan

Multi-pass TIG welding was conducted on plates(15×300×180 mm^(3))of aluminum alloy Al-5083 that usually serves as the component material in structural applications such as cryogenics and chemical processing *** formation and solidification cracking are the most common defects when TIG welding Al-5083 alloy,which is sensitive to the welding heat *** the experiment,the heat input was varied from 0.89 kJ/mm to 5 kJ/mm designed by the combination of welding torch travel speed and welding ***,micro-Vicker hardness and Charpy impact tests were executed to witness the impetus response of heat input on the mechanical properties of the *** inspection was performed to assess the joint’s quality and welding *** results show that all the specimens displayed inferior mechanical properties as compared to the base *** was established that porosity was progressively abridged by the increase of heat *** results also clinched that the use of medium heat input(1-2 kJ/mm)offered the best mechanical properties by eradicating welding defects,in which only about 18.26% of strength was *** yield strength of all the welded specimens remained unaffected indica ted no influence of heat *** melted zone(PMZ)width also affected by heat input,which became widened with the increase of heat *** grain size of PMZ was found to be coarser than the respective grain size in the fusion *** impact testing revealed that the absorbed energy by low heat input specimen(welded at high speed)was greater than that of high heat input(welded at low speed)because of low porosity and the formation of equiaxed grains which induce better impact ***(-196℃)impact testing was also performed and the results corroborate that impact properties under the cryogenic environment revealed no appreciable change after welding at designated heat ***,Macro and micro fractured surfaces of tensile and impact spe

关键词： Tungsten inert gas welding(TIG) Heat input Welding defects Tensile strength Charpy impact strength Micro-vicker hardness SEM

A thin Si nanowire network anode for high volumetric capacity and long-life lithium-ion batteries

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Journal of Energy Chemistry 2023年第6期81卷 20-27,I0002页

作者： Ibrahim Saana Amiinu sumair Imtiaz Hugh Geaney Tadhg Kennedy Nilotpal Kapuria Shalini Singh Kevin M Ryan Bernal Institute University of LimerickLimerick V94 T9PXIreland Department of Chemical Sciences University of LimerickLimerick V94 T9PXIreland

Silicon nanowires(Si NWs)have been widely researched as the best alternative to graphite anodes for the next-generation of high-performance lithium-ion batteries(LIBs)owing to their high capacity and low discharge ***,growing binder-free Si NW anodes with adequate mass loading and stable capacity is severely limited by the low surface area of planar current collectors(CCs),and is particularly challenging to achieve on standard pure-Cu substrates due to the ubiquitous formation of Li+inactive silicide ***,the growth of densely-interwoven In-seeded Si NWs is facilitated by a thin-film of copper-silicide(CS)network in situ grown on a Cu-foil,allowing for a thin active NW layer(99.6%and stable performance for>900 cycles with≈88.7%capacity *** significantly,it delivers a volumetric capacity of≈1086.1 m A h/cm^(3)at *** full-cell versus lithium manganese oxide(LMO)cathode delivers a capacity of≈1177.1 m A h/g at 1C with a stable rate *** electrode architecture represents significant advances toward the development of binder-free Si NW electrodes for LIB application.

关键词： Si NW anode Silicidation LMO cathode Amorphous ligaments Volumetric capacity Lithium-ion batteries

Modified Separators for High Performance Lithium-Sulfur Batteries

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Modified Separators for High Performance Lithium-Sulfur Batt...

作者： sumair Imtiaz 济南大学

学位级别：硕士

Lithium-Sulfur batteries（LSBs）has gained much attraction as the future-generation rechargeable batteries owing to its exceptional specific energy density of 2600 Wh kg-1 and theoretical specific capacity of 1675 mAh g-1,which is remarkably higher than the state-of-art lithium-ion batteries（LIBs）.Moreover,sulfur also offers an advantage of high abundance and environmental ***,there are many drawbacks that are hindering its *** most critical one is the so called “shuttle effect”,which is due to the dissolution of the long-chain lithium polysulfides（Li2Sx,4 ≤ x ≤ 8）into the electrolyte and their free movement between the anode and *** research in this thesis mainly focuses on the development of modified separator to inhibit the shuttling of polysulfides for obtaining high performance LSBs and is summarized as *** trioxide（MoO3）is prepared by facile hydrothermal method and is used to modify the separator to improve the performance of *** significantly suppresses the polysulfides shuttling by successfully blocking the polysulfides on the *** randomly arranged layers of MoO3 nanobelts provide enough porous networks that provide effective space for electrolyte infiltration and facile pathway for fast ionic ***,due to the excellent diffusion of lithium ions and improved reaction kinetics,the enhanced electrochemical performance is *** MoO3-modified separator exhibited a very high initial capacity of 1377 mAh g-1,684.4 mAh g-1 after 200 cycles at 0.5 C,and the capacity fading rate of only 0.251% per ***,the modification with MoO3 provides good surface protection of lithium anode and depresses the lithium anode degradation,thus protracts its *** on excellent lithium-ion diffusivity of molybdenum sulfide（MoS2）,we have successively applied MoS2 as the separator modified material by facile slurry coating *** layer successfully blocks the dissoluti

关键词：锂硫电池改性隔膜三氧化钼二硫化钼碳化钼

Factors influencing synthesis and properties of MAX phases

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Science China Materials 2024年第11期67卷 3427-3455页

作者： Maaz Ullah Khan sumair Ahmed Soomro Muhammad Irfan Jahanger Yanchun Zhou Longsheng Chu Qingguo Feng Chunfeng Hu Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

MAX phases are a member of ternary carbide and nitride,with a layered crystal structure and a mixed nature of chemical bonds(covalent-ionic-metallic)that promote MAX phases embracing both ceramic and metal *** a result,MAX phase ceramics emerge with remarkable properties unique from other traditional *** this review,we focus on alternate processing approaches for MAX phases that are cost-effective and *** MAX phase purity,formation of other unwanted phases,microstructure,and properties are influenced by many parameters during ***,we highlight the effect of numerous factors,which alternately diminish the efficiency and performance of ***,the impact of several parameters,such as starting materials,stoichiometric composition,temperature,pressure,particle size,porosity,microstructure,mechanical alloying,mechanical activation,ion irradiation,and doping,are summarized to reveal their influence on the synthesis and properties of MAX *** potential applications of MAX phases are considered for their development on a commercial scale toward the industry.

关键词： MAX phase ceramics synthesis route properties applications

Biomass-derived nanostructured porous carbons for lithium-sulfur batteries

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Science China Materials 2016年第5期59卷 389-407页

作者： sumair Imtiaz 张建 Zahid Ali Zafar 季胜楠黄太仲 James A.Anderson 张昭良黄云辉 School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsUniversity of JinanJinan 250022China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Surface Chemistry and Catalysis Group Materials and Chemical EngineeringSchool of EngineeringUniversity of AberdeenAberdeen AB24 3UEUK

Biomass has been utilized as an energy source for thousands of years typically in the formof wood and *** advances create new methodologies to extract energy and chemicals frombiomass. The biomass-derived nanostructured porous carbons(BDNPCs) are the most promising sulfur hosts and interlayers in rechargeable lithium-sulfur(Li-S) batteries. In this article, a comprehensive review is provided in the synthesis of nanostructured porous carbon materials for high-performance rechargeable Li-S batteries by using biomass. The performances of the Li-S batteries dependent on the porous structures(micro, meso and hierarchical) from BDNPCs are discussed, which can provide an in-depth understanding and guide rational design of high-performance cathode materials by using low-cost,sustainable and natural bio-precursors. Furthermore, the current existing challenges and the future research directions for enhancing the performance of Li-S batteries by using natural biomass materials are also addressed.

关键词： biomass lithium-sulfur battery porous carbon cathode sulfur hosts interlayers

以浒苔制备类珊瑚微孔碳作为主基体在锂硫电池中的应用

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以浒苔制备类珊瑚微孔碳作为主基体在锂硫电池中的应用

中国化学会第30届学术年会-第三十分会：化学电源

作者：季胜楠刘静蔡连国孙丹 sumair Imtiaz Zahid Ali Zafar Rameez Razaq 张昭良黄云辉济南大学化学化工学院华中科技大学材料科学与工程学院

锂硫电池由于其高比能量、低成本和环境友好的特点被认为是极具潜力的下一代电动汽车和智能电网用储能电池,但同时具有可逆容量不高、循环和倍率性能不好的问题,这是由于反应过程中shuttle效应和硫元素低电导率所致。本课题采用环境污... 详细信息

锂硫电池由于其高比能量、低成本和环境友好的特点被认为是极具潜力的下一代电动汽车和智能电网用储能电池,但同时具有可逆容量不高、循环和倍率性能不好的问题,这是由于反应过程中shuttle效应和硫元素低电导率所致。本课题采用环境污染物为原料制备出生物质碳材料作为单质硫的导电骨架,变废为宝的同时在一定程度上改善了锂硫电池的库伦效率、循环性能。类"珊瑚"结构的碳骨架材料具有高达2124.18 m/g的比表面,有利于降低Li+的迁移路径,加速电化学反应的进行。在接近1 mg cm的硫单位面积负载量条件下,该材料表现出较高的可逆容量(900 mAh g)优秀的循环性能(经过200 cycles容量保持率85%)且一直保持100%左右的库伦效率。

关键词：锂硫电池海洋废物硫碳复合物

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影响MAX相合成及其性能的因素（英文）

Science China Materials 2024年第11期 3427-3455页

作者： Maaz Ullah Khan sumair Ahmed Soomro Muhammad Irfan Jahanger 周延春楚珑晟冯庆国胡春峰 Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong University School of Materials Science and Engineering Zhengzhou University

MAX相是一类三元化合物,具有层状晶体结构和混合化学键性质(共价-离子-金属键),因而其同时具有陶瓷和金属的特性.MAX相陶瓷展现出与其他传统陶瓷不同的独特性能.在本综述中,我们重点介绍了一些代表性的MAX相合成方法,这些方法具有成本...

MAX相是一类三元化合物,具有层状晶体结构和混合化学键性质(共价-离子-金属键),因而其同时具有陶瓷和金属的特性.MAX相陶瓷展现出与其他传统陶瓷不同的独特性能.在本综述中,我们重点介绍了一些代表性的MAX相合成方法,这些方法具有成本效益和节能潜力.MAX相的纯度、杂质相的形成、微观结构和性能在制备过程中受到许多参数的影响.因此,我们特别强调了各种因素的影响,这些因素会交替削弱材料的制备效率和最终性能.本文总结了起始材料、化学计量比、温度、压力、粒度、孔隙率、微观结构、机械合金化、机械活化、离子辐照和掺杂等多个参数的影响,以揭示它们对MAX相合成和性能的影响.最后,我们探讨了MAX相在商业上的潜在应用,并展望其在工业领域的发展前景.

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