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Chinese Journal of Catalysis 2024年第4期59卷 97-117页

作者： Vinoth Kumar Ponnumsamy Hussein E.Al-Hazmi Sutha Shobana jeyaprakash dharmaraja Dipak Ashok Jadhav Rajesh Banu J Grzegorz Piechota Bartłomiej Igliński Vinod Kumar Amit Bhatnagar Kyu-Jung Chae Gopalakrishnan Kumar 高雄医科大学药物与应用化学系环境医学研究中心中国台湾高雄高雄医科大学医学研究部中国台湾高雄格但斯克理工大学土木与环境工程学院波兰纳鲁特维察格但斯克范朗大学工程与技术学院建筑绿色技术与可持续发展研究组越南胡志明市工程技术学院科学与人文系化学部印度泰米尔纳德邦韩国海洋大学海洋科学与工程学院环境工程系韩国釜山泰米尔纳德邦中央大学生命科学系印度泰米尔纳德邦 GPCHEM沼气研究与分析实验室波兰尼古拉斯哥白尼大学化学系波兰克兰菲尔德大学水与能源学院英国拉彭兰塔工业大学工程科学学院分离科学系芬兰韩国海洋大学海洋可再生能源工程专业韩国釜山延世大学土木与环境工程学院韩国首尔斯塔万格大学科学技术学院化学、生物科学与环境工程研究所挪威斯塔万格

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化... 详细信息

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化技术从微藻中提取脂质,并通过酯交换反应可以将其转化为脂肪酸甲酯,是生产绿色生物燃料的有效途径.这一过程涉及游离脂肪酸、磷脂和甘油三酯的提取,并且生产过程能耗低,成为满足日益增长的能源需求的一种理想解决方案.本文综述了微藻脂质提取和酯交换制备生物燃料的相关研究进展.首先,介绍了微藻脂质的提取方法,包括溶剂提取法、索氏提取法、布利格和戴耶法、超临界二氧化碳提取以及离子液体溶剂法等,并分析了各方法的优缺点.随后,重点阐述了酯交换技术在微藻脂质转化中的应用,包括酸碱催化、酶催化以及原位酯交换反应等,并探讨了这些技术的反应机理、催化剂选择、反应器设计以及生物油生产工艺等方面的研究进展.通过综述上述研究进展,为微藻脂质的生产和应用提供了理论指导.研究表明,通过优化催化剂种类、反应条件以及提取方法,可以有效提高微藻脂质的转化效率和生物油品质.同时,本文也指出了当前微藻脂质生产中面临的挑战,如微藻栽培和生长条件优化、高效转化技术的开发等.随着可持续能源日益受到重视,微藻脂质作为一种可再生能源具有巨大的发展潜力.未来研究应进一步关注微藻的规模化栽培、生长条件优化以及高效转化技术的研发,以提高微藻脂质的产量和品质.同时,应进一步推动和实现微藻生物燃料的实际应用,从而为应对气候变化和能源危机提供有效的解决方案.

关键词：微藻脂质提取酯交换催化酶催化原位技术

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Optimization of tribological parameters over WC-12%Co laser alloyedpearlitic ductile iron using Taguchi based Grey relational analysis

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Journal of Central South University 2020年第3期27卷 736-751页

作者： N.jeyaprakash YANG Che-hua TSENG Sheng-po Centre of Mass Customization Additive Manufacture National Taipei University of TechnologyTaiwanChina Institute of Manufacturing Technology National Taipei University of TechnologyTaiwanChina

Pearlitic ductile irons(PDIs)are used in transportation and nuclear energy *** heavy loading situation,the service life of PDI is affected by numerous tribo *** this study,surface of the PDI is alloyed with WC-12%Co powder using a high power fibre *** wear properties of the base material and laser alloying samples were investigated by tribometer with various parameters,i.e.,temperature,load and sliding *** on experimental test,the load has maximum percentage of contribution and followed by sliding speed and working *** optimized tribological parameters by Grey relational analysis(GRA)were established and those values are closely matched with predicted ***,base material and laser alloying surfaces were examined through Vickers hardness machine,scanning electron microscopy(SEM)and roughness *** laser altered specimen shows no defects and improves the wear properties than *** identified optimal tribological parameters are load of 30 N,speed of 0.5 m/s and working temperature of 300℃,and load of 30 N,speed of 0.5 m/s and working temperature of 200℃ for base metal and laser alloying samples,respectively.

关键词： WC-12%Co laser alloying microstructure wear resistance Grey technique analysis of variance optimization roughness

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Comparison of microstructure, mechanical and wear behaviour of laser cladded stainless steel 410 substrate using stainless steel 420 and Colmonoy 5 particles

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Journal of Iron and Steel Research International 2020年第12期27卷 1446-1455页

作者： N.jeyaprakash Che-hua Yang KRRamkumar Guang-zhou Sui Additive Manufacturing Center for Mass CustomizationProduction National Taipei University of TechnologyTaipei 10608TaiwanChina Institute of Manufacturing Technology National TaipeiUniversity of TechnologyTaipei 10608TaiwanChina Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Graduate Institute of Mechanical and Electrical Engineering National Taipei University of TechnologyTaipei 10608TaiwanChina

Stainless steel (SS) 410 is widely used in many components of nuclear reactors due to its good corrosion resistance and high strength. However, wear is a major issue of these components due to its continuous sliding. SS 420 and Colmonoy 5 particles were deposited over SS 410 substrate by laser cladding process. Then, X-ray diffraction was used to find the phases present after cladding process. Further, coating morphologies were analysed by scanning electron microscopy (SEM) twinned with energy-dispersive spectroscopy. The obtained morphology indicates the hard laves phase present in the Colmonoy 5 cladding surface and needle-like structure in SS 420 cladding surface. Then, Vickers microhardness test was carried out in order to study the hardness and load-carrying capacity of the cladding specimen. Among those, Colmonoy 5 cladding specimen provide higher hardness due to the presence of laves phase formation. Then, the dry sliding wear study was conducted to calculate the mass loss after 2500 m of sliding. The combined effect of hardness and laves phase formation were reflected in dry sliding wear study analysis of the specimens. Then, to study the wear mechanism and roughness, worn surface morphologies were captured using SEM and white light interferometer, respectively.

关键词： Stainless steel(SS)410 Stainless steel(SS)420 Colmonoy 5 Laser cladding Laves phase Wear behaviour Mechanism Roughness

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Formaldehyde vapour sensing property of electrospun NiO nanograins

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Frontiers of Materials Science 2021年第3期15卷 416-430页

作者： Roopa Kishore KAMPARA Sonia T. Balamurugan D. jeyaprakash B.G. Functional Nanomaterials Lab/School of Electrical&Electronics Engineering SASTRA Deemed to be UniversityThanjavurTamil Nadu 613401India

Beads free polyvinyl alcohol(PVA)/NiO nanofibers with an average diameter of 400 nm were successfully prepared through the electrospinning *** nanograins were formed along the axis of the nanofiber due to the calcination of asspun fibers for 24 h at 450℃ and their presence was confirmed by *** nanograins were characterized by XRD,XPS and *** characterization results showed the presence of NiO in nanograins and its polycrystalline nature with ionic *** sensing studies of NiO nanograins were performed towards the pulmonary disease breath markers and they showed better response towards formaldehyde vapour at 350℃.Calcined NiO grains showed a good response towards the 11-1145 ppm of formaldehyde vapour at the operating temperature of 350℃.NiO nanograins also showed quick response time(37 s)and recovery time(14 s)towards 46 ppm of formaldehyde.A sensing mechanism was proposed for the formaldehyde vapour interaction at 350℃ with NiO nanograins.

关键词： electrospinning nanofibers nanograins PVA vapour sensor NiO formaldehyde

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KAMAR: A Lightweight Feistel Block Cipher Using Cellular Automata

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Circuits and Systems 2016年第4期7卷 222-230页

作者： Jegadish Kumar Kailairajan jeyaprakash Joseph Gladwin Seka Kamaraj Villayutham Department of Electronics and Communication Engineering Sri Sivasubramaniya Nadar College of Engineering Chennai India

Wireless Multimedia Sensor Network (WMSN) is an advancement of Wireless Sensor Network (WSN) that encapsulates WSN with multimedia information like image and video. The primary factors considered in the design and deployment of WSN are low power consumption, high speed and memory requirements. Security is indeed a major concern, in any communication system. Consequently, design of compact and high speed WMSN with cryptography algorithm for security, without compromising on sensor node performance is a challenge and this paper proposes a new lightweight symmetric key encryption algorithm based on 1 D cellular automata theory. Simulations are performed using MatLab and synthesized using Xilinx ISE. The proposed approach supports both software and hardware implementation and provides better performance compared to other existing algorithms in terms of number of slices, throughput and other hardware utilization.

关键词： Cryptography WMSN Cellular Automata Reversible Cellular Automata KAMAR Feistel Block Cipher Key Scheduling Algorithm FPGA

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