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Journal of Power and Energy Engineering 2013年第5期1卷 53-57页

作者： V. P. Sethi k. sumathy D. S. Pal Department of Mechanical Engineering Punjab Agricultural University Ludhiana Punjab India 2Department of Mechanical Engi-neering North Dakota State University Fargo USA 3Department of Mathematics Statistics and Physics Punjab Agricultural Uni-versity Ludhiana Punjab India.

Mathematical relations are developed to compute optimum inclination angle of booster mirror for horizontally placed cook.r (λ) and for optimally inclined cook.r (ψ) during all months (selected day) of the year at 30°N latitude for maximizing the reflected component of solar intensity onto the absorber plate of the cook.r. A solar radiation model is also developed and used to compute the ratio of various solar intensities on horizontal, inclined and normal surface of the absorber plate for all months at 30°N latitude. These ratios give a clear indication of greater solar radiation availability on the optimally inclined cook.r as compared to the horizontally placed cook.r for faster cook.ng especially during winter months when solar radiation capture is small. Experimental validations have also been performed to access the accuracy of the developed relations and model.

关键词： Solar Radiation Solar Cook.r Optimum Inclination Booster Mirror

An in vitro Anti-urolithiasis Activity of a Herbal Formulation:Spinacia oleracea *** Coriandrum sativum L.

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Clinical Complementary Medicine and Pharmacology 2024年第1期4卷 76-84页

作者： sumathy Raj Monica Shree Gnana Soundara Rajan Suganthi Ramasamy Rimal Isaac Rajamony Suthies Goldy Ramathilaga Ariyamuthu Monisha Sudhagar Sak.hivel Gandhi Prak.sh Shoba Manik.ndan Gurusamy School of Biotechnology Dr.G.R.Damodaran College of ScienceCoimbatoreTamil NaduIndia Department of Biotechnology Dr.N.G.P Arts and Science CollegeCoimbatoreTamil NaduIndia Department of Nanotechnology Noorul Islam Centre for Higher EducationKumaracoilThuckalayKanyakumari DistrictTamil NaduIndia PG and Research Department of Biochemistry Kongunadu Arts and Science CollegeCoimbatoreTamil NaduIndia Department of Biological and Chemical Engineering Mekelle UniversityMekelleEthipoia Department of Zoology Holy Cross College(Autonomous)NagercoilTamilnaduIndia Department of Pharmaceutical Sciences Tshwane University of TechnologyArcadia CampusPretoriaSouth Africa

Back.round:Hard mineral and acid salt deposits that clump together in concentrated urine are k.own as k.dney stones.A complicated chain of physicochemical events,including hyper saturation,nucleation,growth,aggrega-tion,and retention in the urinary tract,leads to urolithiasis,the third most prevalent urinary tract *** traditional medications and therapies are less successful in treating urolithiasis and frequently cause ***:The present study is focused on evaluating the anti-urolithiasis activities of the polyherbal formulation prepared from Spinacia oleracea *** Coriandrum sativum ***:To evaluating the anti-urolithiasis activities of the polyherbal formulation prepared from *** and *** seeds against oxalate crystals by employing an in vitro inhibition,aggregation,and nucleation assay,employing a spectrophotometer followed by microscopic observation,and further monitored by egg semiperme-able membrane model,using cystone as a standard ***:In the present work.the alk.loids,glycosides,flavonoids,glycosides,phenols,saponins,steroids,tannins,terpenoids,and triterpenoids were found in the extracts of *** and *** in vitro assays in the present study clearly indicated that all the mixture extracts readily prevented crystal nucleation,growth and *** aqueous extract of the mixture inhibited significant inhibitory potential against the crystallization ***:It can be said that the phyto-constituents enriched homemade preparation possibly will be used as a medication for the management of k.dney stones by dissolving the oxalate stone in the k.dney.

关键词： Urolithiasis Polyherbal Egg membrane Spinacia oleracea Coriandrum sativum

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二氧化钛光催化分解水制氢技术进展

现代化工 2005年第4期25卷 9-12页

作者：倪萌 LEUNG Michael sumathy k 香港大学机械工程系

简单介绍了二氧化钛光催化分解水制氢的基本原理。综述了加入牺牲剂、碳酸钠、贵金属负载化、金属离子掺杂、阴离子掺杂、染料光敏化、半导体复合以及离子注入等提高二氧化钛光催化制氢的方法,讨论了这几种改性技术的机理以及对提高二... 详细信息

简单介绍了二氧化钛光催化分解水制氢的基本原理。综述了加入牺牲剂、碳酸钠、贵金属负载化、金属离子掺杂、阴离子掺杂、染料光敏化、半导体复合以及离子注入等提高二氧化钛光催化制氢的方法,讨论了这几种改性技术的机理以及对提高二氧化钛在可见光下的制氢效率的作用。重点讨论了阴离子掺杂和离子注入技术的机理和研究进展,指出离子注入是目前扩展二氧化钛光响应的最为有效的技术。最后讨论了光催化分解水制氢的氢氧分离问题,并通过与其他制氢技术的对比分析,指出光催化制氢将是通往氢经济的非常有潜力的制氢技术。

关键词：二氧化钛光催化制氢贵金属沉积离子掺杂染料光敏化复合半导体离子注入

IOT Assisted Biomedical Monitoring Sensors for Healthcare in Human

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Computer Systems Science & Engineering 2023年第6期45卷 2853-2868页

作者： S.Periyanayagi V.Nandini k.Basarik.di V.sumathy Department of ECE Ramco Institute of TechnologyRajapalayam626117India Department of CSE Sona College of TechnologySalem636005India Department of Mathematics Ramco Institute of TechnologyRajapalayamIndia Government College of Engineering DharmapuriIndia

The Internet of Things(IoT)is a concept that refers to the deployment of Internet Protocol(IP)address sensors in health care systems to monitor patients’*** has the ability to access the Internet and collect data from *** decisions are made after evaluating the information of illness people ***’health and well-being can be monitored through IoT medical *** is possible to trace the origins of biological,medical equipment and *** reliability is a major concern in user activity and fitness track.rs in day-to-day *** fundamental challenge is to measure the efficiency of the human system *** to maintain tabs on the well-being of humans;this paper recommends the use of wireless body area network.(WBANs)and artificial neural network.(ANN)to create an IoT-based healthcare framework.for hospital information systems(IoT-HF-HIS).Our evaluation system uses a server to estimate how much computing power is needed for modeling,and simulations of the framework.have been done using data rate and latency requirements are implementing the energy-aware technology presented in this *** proposed framework.implements several hospital information system case studies by building a time-saving simulation *** the world’s population ages,more and more people suffer from physical and emotional *** the recommended strategy regularly has been proven user-friendly,reliable,and cost-effective,with an overall performance of 95.2%.

关键词： IoT WBANs ANN healthcare biomedical sensors humans

Pharmacological activity,phytochemical analysis and toxicity of methanol extract of Etlingera elatior(torch ginger) flowers

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Asian Pacific Journal of Tropical Medicine 2010年第10期3卷 769-774页

作者： Subramanion Jo Thy Lachumy Sreenivasan Sasidharan Velio sumathy Zak.ria Zuraini School of Distance Education Universiti Sains MalaysiaMinden 11800Pulau PinangMalaysia Institute for Research in Molecular Medicine(INFORMM) Universiti Sains MalaysiaMinden 11800Pulau PinangMalaysia

Objective:To elucidate its pharmacological activities and medicinal potential of extract of Etlingera elatior（***）.Methods:Phytochemical screening of the flower extract was done to determine the phytochemical in the *** pharmacological study included the determination of antimicrobial activity and minimum inhibitory concentration（MIC） of metabolic flower *** antimicrobial activity of the extract was tested against medically important bacterial,yeast and fungal *** from that,the methanolic extract of *** flower was further tested in vivo toxicity using the brine shrimp lethality ***,the flower extract was qualitatively screened for their free radical scavenging activity by 2,2-diphenyl-1- picrylhydrazyl radical（DPPH） ***:The extract was effective on tested microorganisms and MIC values were in the range of 1.563-50.000 mg/*** brine shrimp lethality test exhibited no significant toxicity(LC50= 2.52 mg/mL) against Artemia *** *** flower extract with high LC50 value signified that this plant is not toxic to *** the phytochemical screening of the flower extract revealed the presence of the following compounds: flavonoids,terpenoids,saponin,tannins and carbohydrates whereas,alk.loids,anthraquinone and reducing sugars were *** concentration of the flower extract required for 50% inhibition of DPPH radical scavenging effect(IC50) were 9.14 mg/mL and 8.08 mg/mL for butylated hydroxytoluene 8.08 mg/***:These findings indicate that the extract of *** flower possesses pharmacological properties and potential to develop natural products based pharmaceuticals products.

关键词： Etlingera elatior Pharmacological activity Phytochemical analysis Artemia salina

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太阳能制氢技术

可再生能源 2004年第3期22卷 29-31页

作者：倪萌 M k.H Leung k.sumathy 香港大学机械工程系香港

氢能是一种高效、无污染的新能源,利用可再生能源制氢是开发氢能源的有效途径.文章总结了国内外目前利用太阳能制氢技术的发展现状,介绍了利用光伏系统转化的电能电解水制氢和利用太阳能的热化学反应循环制氢2种清洁无污染的制氢工艺.

关键词：太阳能电解水制氢热化学反应循环制氢

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太阳能电池研究的新进展

可再生能源 2004年第2期22卷 9-11页

作者：倪萌 M k.Leung k.sumathy 香港大学机械工程系

简要回顾了第一代晶体硅和第二代薄膜太阳能电池的发展状况熏并介绍了基于薄膜技术的第三代高性能太阳能电池的基本原理和发展趋势。

关键词：太阳能电池晶体硅薄膜技术发展趋势工作原理

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生物质热化学过程制氢技术

可再生能源 2004年第5期22卷 37-40页

作者：倪萌 M k.H Leung k.sumathy 香港大学机械工程系

生物质是世界上最丰富的可再生资源之一氢能源是未来理想的能源载体。生物质生长周期短产量巨大作为能源利用时,其CO2排放量几乎为零因此被视为非常有潜力的清洁能源之一。生物质制氢技术主要包括热化学过程和生物过程,其中热化学过程... 详细信息

生物质是世界上最丰富的可再生资源之一氢能源是未来理想的能源载体。生物质生长周期短产量巨大作为能源利用时,其CO2排放量几乎为零因此被视为非常有潜力的清洁能源之一。生物质制氢技术主要包括热化学过程和生物过程,其中热化学过程主要是将生物质气化或生成生物油再进行重整和水气置换反应从而获得较高产量的氢气。文章介绍了利用生物质热裂解和气化(包括超临界水条件下气化)制氢技术并对其未来的发展做了展望.

关键词：生物质氢热裂解气化超临界水气化

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燃料电池的应用前景

华北电力技术 2004年第8期 19-22页

作者：倪萌 M.k.H.Leung k.sumathy 香港大学机械工程系

介绍了新型化学电源——燃料电池的工作原理 ,结构 ,分类 ,对比了各种燃料电池的特性和研究进展 ,对燃料电池的发展和在香港的应用进行了展望。

关键词：燃料电池可再生能源交通

Design and Implementation of Multilevel Access Control in Synchronized Audio to Audio Steganography Using Symmetric Polynomial Scheme

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Journal of Information Security 2010年第1期1卷 29-40页

作者： Jeddy Nafeesa Begum k.ishnan k.mar Vembu sumathy Department of Computer Science and Engineering Government College of Engineering Department of Electronics and Communications Engineering Government College of Technology

Steganography techniques are used in Multimedia data transfer to prevent adversaries from eaves dropping. Synchronized audio to audio steganography deals with recording the secret audio, hiding it in another audio file and subsequently sending to multiple receivers. This paper proposes a Multilevel Access control in Synchronized audio steganography, so that Audio files which are meant for the users of low level class can be listened by higher level users, whereas the vice-versa is not allowed. To provide multilevel access control, symmetric polynomial based scheme is used. The steganography scheme mak.s it possible to hide the audio in different bit locations of host media without inviting suspicion. The Secret file is embedded in a cover media with a k.y. At the receiving end the k.y can be derived by all the classes which are higher in the hierarchy using symmetric polynomial and the audio file is played. The system is implemented and found to be secure, fast and scalable. Simulation results show that the system is dynamic in nature and allows any type of hierarchy. The proposed approach is better even during frequent member joins and leaves. The computation cost is reduced as the same algorithm is used for k.y computation and descendant k.y derivation. Steganography technique used in this paper does not use the conventional LSB’s and uses two bit positions and the hidden data occurs only from a frame which is dictated by the k.y that is used. Hence the quality of stego data is improved.

关键词： Steganography Multilevel Access Control Synchronized Audio Symmetric Polynomial Dynamic Scalable