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Frontiers of Materials Science 2013年第4期7卷 350-361页

作者： Bhaarathi DHURAI Nachimuthu SARASWATHY ramasamy maheswaran Ponnusamy SETHUPATHI Palanisamy VANITHA Sukumar VIGNESHWARAN~, and Venugopal RAMESHBABU Department of Textile Technology Kumaraguru College of Technology Coimbatore 641049 Tamilnadu India Department of Biotechnology Kumaraguru College of Technology Coimbatore 641049 Tamilnadu India

The curcumin loaded chitosanlpoly （lactic acid）（PLA） nanoflbers were produced using electrospinning. Box-Behnken experimental design was used for the optimization of variables （-1, 0, ＋ 1 coded level） like chitosan/PLA strength （% w/v）, curcumin strength （% w/v） and applied voltage （kV） to obtain uniform fiber diameter. The morphology of nanofibers was shown by SEM. Molecular interactions and the presence of each chemical compound of curcumin loaded chitosanlPLA fibers were characterized by FTIR and EDX analysis. Antioxidant, drug release and in vitro cytotoxicity tests were performed to evaluate the suitability of nanofibers that would be used for wound healing. In vivo wound healing studies on excision and incision wounds created on rat model showed significant reduction of wound area when compared to untreated. The better healing efficiency can be attributed to the presence of curcumin and chitosan.

关键词： Box-Behnken chitosan curcumin electrospinning poly (lactic acid) (PLA)

Planetary health risks in urban agriculture

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Global Health Journal 2024年第1期8卷 4-10页

作者： Nilanjana Ganguli Anna Maria Subic Janani maheswaran Byomkesh Talukder Dahdaleh Institute for Global Health Research&Faculty of Environmental&Urban Change York UniversityTorontoOntario M3J1P3Canada Dalla Lana School of Public Health University of TorontoTorontoOntario 5T3M7Canada Faculty of Health York UniversityTorontoOntario M3J1P3Canada Department of Global Health Florida International UniversityMiamiFlorida 33199USA

Urban agriculture is gaining recognition for its potential contributions to environmental resilience and climate change adaptation,providing advantages such as urban greening,reduced heat island effects,and decreased air ***,it indirectly supports communities during weather events and natural disasters,ensuring food security and fostering community ***,concerns about planetary health risks persist in highly urbanized and climate-affected *** electronic databases such as Web of Science and PubMed and adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines,we identified 55 relevant papers to comprehend the planetary health risks associated with urban agriculture,The literature review identified five distinct health risks related to urban agriculture:(1)trace metal risks in urban farms;(2)health risks associated with wastewater irrigation;(3)zoonotic risks;(4)other health risks;and(5)social and economic *** study highlights that urban agriculture,while emphasizing environmental benefits,particularly raises concerns about trace metal bioaccumulation in soil and vegetables,posing health risks for *** well studied risks included wastewater irrigation and backyard livestock *** main limitations in the available literature were in studying infectious diseases and antibiotic resistance associated with urban agriculture.

关键词： Urban agriculture Urbanization Systems-thinking Planetary health impacts Comprehensive risk analysis Planetary Health Risks Analysis of Urban Agriculture Framework(PHRAUAF) Heuristic

Downwash airflow distribution pattern of hexa-copter unmanned aerial vehicles

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 24-34页

作者： Dengeru Yallappa ramasamy Kavitha Allimuthu Surendrakumar Kannan Balaji Balakrishnan Suthakar Ayyasamy Paramasivam Mohan Kumar Yathendranaik Ravi Narayananaik Ashoka Kumar Kavan Department of Farm Machinery and Power Engineering Agricultural Engineering College and Research InstituteTamil Nadu Agricultural UniversityCoimbatore

In recent times,the use of vertical take-off and landing(VTOL)multi-rotor Unmanned Aerial Vehicle(UAVs)for spraying chemical pesticides against weeds and pests has recently become *** current aerial spray application research is primarily focused on examining the influence of UAV spraying parameters such as flight height,travel speed,rotor configuration,droplet size,payload and wind *** downwash airflow velocity generated by the UAV rotor propeller has a significant impact on the droplet deposition process.A test rig was developed to measure the downwash airflow pattern generated by the rotor propeller of a *** this investigation,a six-rotor electric autonomous UAV sprayer was used to investigate the parameters and distribution laws of downwash airflow *** downwash airflow velocity was measured using portable anemometers mounted on the test rig at radial positions viz.,0 m,0.5 m,1 m,1.5 m and 2 m,perpendicular to(X)and parallel to the UAV’s flight direction(Y).The experiment was conducted at three levels of hover height,viz.,1 m,2 m and 3 m(Z)and three levels of payload,viz.,0 kg,5 kg,and 10 *** special downwash airflow distribution pattern was analysed using the Python programming language(Version 3.7).Results show that the downwash airflow velocity generated by the radial position of the UAV rotor is evenly distributed on the rotating loop and the standard deviation of the downwash airflow velocity is less than 0.5 m/*** maximum downwash airflow velocity of 13.8 m/s was observed below the rotor at 10 kg payload capacity,1 m hover height(Z),and 0.5 m in the *** minimum downwash wind field of 0.3 m/s was observed at 0 kg pay load capacity,1 m height,and 2 m in the *** downwash airflow velocity along each position in the radial direction of the rotor increases initially and then *** downwash airflow distribution results helps in mounting of spray nozzle configuration to drone sprayer which helps to

关键词： downwash air payload rotor propeller flight height distribution analysis flight direction

磁性纳米铁对土壤理化性质及微生物群落和代谢的影响研究进展

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环境化学 2024年第6期43卷 1820-1831页

作者：何建荣魏晓贺刘煜莹苗欣宇欧阳少虎岳晴李鑫 ramasamy Rajesh Kumar 天津理工大学环境科学与安全工程学院天津300384 南开大学环境科学与工程学院环境污染过程与基准教育部重点实验室天津市城市生态环境修复与污染防治重点实验室天津300071 天科院环境科技发展(天津)有限公司天津300450 Bharti大学印度491001

近年来,磁性纳米铁因其独特性能在生物医学、农业、工业、生命科学及环境保护领域广泛应用.随着磁性纳米铁的大范围应用,其对环境和人体健康将带来的潜在影响,已经引起科学界的广泛关注.本文系统总结了近年来磁性纳米铁的相关文献资料,... 详细信息

近年来,磁性纳米铁因其独特性能在生物医学、农业、工业、生命科学及环境保护领域广泛应用.随着磁性纳米铁的大范围应用,其对环境和人体健康将带来的潜在影响,已经引起科学界的广泛关注.本文系统总结了近年来磁性纳米铁的相关文献资料,探讨了磁性纳米铁的合成方法、表征及环境应用;我们重点强调了磁性纳米铁对土壤理化性质及微生物群落和代谢的潜在影响.最后展望了磁性纳米铁在未来的环境应用、发展及纳米毒理学亟待研究的重要问题.本文旨在更加全面地揭示磁性纳米铁的环境可持续性,为其安全使用和环境功能化应用提供一定的参考.

关键词：磁性纳米铁土壤环境影响微生物群落代谢

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 Sakthivel Gandhi Prakash Shoba Manikandan 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

Background:Hard mineral and acid salt deposits that clump together in concentrated urine are known as kidney 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 alkaloids,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 kidney stones by dissolving the oxalate stone in the kidney.

关键词： Urolithiasis Polyherbal Egg membrane Spinacia oleracea Coriandrum sativum

Reality over Web:Pervasive Computing Meets the Web

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Tsinghua Science and Technology 2013年第6期18卷 568-576页

作者： Muthucumaru maheswaran Devarun Bhattacharya School of Computer Science McGill University

Reality over Web （ROW） is a novel concept, where a window on the web corresponds to a window onto a real space. Once the correspondence is established, users should be able to interact or manipulate the objects or people in the real space through the web window. In this paper, we introduce the RoW concept and highlight the principles that govern its design and implementation. A system architecture for realizing the RoW concept is described along with a proof-of-concept prototype that implements portions of the RoW concept. One essential part of an RoW implementation is accurate Iocationing of objects and people in a video frame. The Iocationing problem becomes particularly challenging because we want to reuse existing infrastructure as much as possible. We developed a high-frequency sound-based Iocationing scheme and implemented it on the prototype. The results from initial experiments performed on the Iocationing scheme are reported here.

关键词： Internet-of-things Iocationing pervasive computing telepresence web web-of-things

Monitoring the Turmeric Finger Disease and Growth Characteristics Using Sensor Based Embedded System —A Novel Method

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Circuits and Systems 2016年第8期7卷 1280-1296页

作者： maheswaran Shanmugam Asokan ramasamy Sivaranjani Paramasivam Priyadharshini Prabhakaran Department of ECE Kongu Engineering College Erode India Kongu Nadu College of Engineering and Technology Trichy India

In this cyber era, novelty plays a prime role in the field of agriculture that majorly depends on computer-based measurements and control. Herein before, it was totally controlled and performed by the agriculturists. One of the technological innovative methods to measure and monitor the turmeric finger growth characteristics is the embedded system that is based on sensor array module such as flex sensor, temperature sensor and pH sensor. The experimental work has been designed and tested with five set of nodes and the growth of turmeric finger is tenuously monitored by measuring the change in flex resistance. Out of five nodes, two nodes were diseased. Deliberately, one node was left as such and the other node was treated with natural pesticides (pseudomonas and viride) to restrict the rhizome rot disease attack. After cultivation, it was found that the rhizome rot disease attack on the node which was treated with pesticides was comparatively lesser than the other node. The five different nodes have been used in the experimental work with an average flex sensor resistance of 3.962 cm/kΩ. In a nutshell, this proposed method manifests the farmers to detect the rhizome rot disease at its earlier stage and to prevent it as well by screening the growth of the turmeric fingers when it is under the soil.

关键词： Embedded System Turmeric Finger Growth Rhizome Rot Disease Natural Pesticides Flex Sensor

Lie group analysis for the effect of temperature-dependent fluid viscosity and thermophoresis particle deposition on free convective heat and mass transfer under variable stream conditions

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Applied Mathematics and Mechanics(English Edition) 2010年第3期31卷 317-328页

作者： ramasamy KANDASAMY Ismoen MUHAIMIN Faculty of Science Arts and HeritageUniversiti Tun Hussein Onn Malaysia

This paper examines a steady two-dimensional flow of incompressible fluid over a vertical stretching sheet. The fluid viscosity is assumed to vary as a linear function of temperature. A scaling group of transformations is applied to the governing equa- tions. The system remains invariant due to some relations among the transformation parameters. After finding three absolute invariants, a third-order ordinary differential equation corresponding to the momentum equation and two second-order ordinary differential equations corresponding to energy and diffusion equations are derived. The equations along with the boundary conditions are solved numerically. It is found that the decrease in the temperature-dependent fluid viscosity makes the velocity decrease with the increasing distance of the stretching sheet. At a particular point of the sheet, the fluid velocity decreases but the temperature increases with the decreasing viscosity. The impact of the thermophoresis particle deposition plays an important role in the concentration boundary layer. The obtained results are presented graphically and discussed.

关键词： Lie group analysis temperature-dependent fluid viscosity thermal radiation thermophoresis particle deposition

2D matrix based indexing with color spectralhistogram for efficient image retrieval

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Journal of Systems Engineering and Electronics 2016年第5期27卷 1122-1134页

作者： maruthamuthu ramasamy john sanjeev kumar athisayam Department of Software Engineering RVS College of EngineeringDindigul 624005India Department of Computer Applications Thiagarajar College of EngineeringMadurai 625015India

A novel content based image retrieval （CBIR） algorithmusing relevant feedback is presented. The proposed frameworkhas three major contributions： a novel feature descriptor calledcolor spectral histogram （CSH） to measure the similarity betweenimages; two-dimensional matrix based indexing approach proposedfor short-term learning （STL）; and long-term learning （LTL）.In general, image similarities are measured from feature representationwhich includes color quantization, texture, color, shapeand edges. However, CSH can describe the image feature onlywith the histogram. Typically the image retrieval process starts byfinding the similarity between the query image and the imagesin the database; the major computation involved here is that theselection of top ranking images requires a sorting algorithm to beemployed at least with the lower bound of O（n log n）. A 2D matrixbased indexing of images can enormously reduce the searchtime in STL. The same structure is used for LTL with an aim toreduce the amount of log to be maintained. The performance ofthe proposed framework is analyzed and compared with the existingapproaches, the quantified results indicates that the proposedfeature descriptor is more effectual than the existing feature descriptorsthat were originally developed for CBIR. In terms of STL,the proposed 2D matrix based indexing minimizes the computationeffort for retrieving similar images and for LTL, the proposed algorithmtakes minimum log information than the existing approaches.

关键词： content based image retrieval (CBIR) color spectralhistogram (CSH) short-term learning (STL) long-term learning(LTL) similarity measures.

Analysis of EMD Algorithm for Identification and Extraction of An Acoustic Signal in Underwater Channel Against Wind Driven Ambient Noise

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China Ocean Engineering 2014年第5期28卷 645-657页

作者： S.Sakthivel MURUGAN V.NATARAJAN K.maheswaran ECE Department SSN College of Engineering Instrumentation Department MIT Campus Anna University Infosys Chennai India

Sonar generated acoustic signals transmitted in underwater channel for distant communications are affected by numerous factors like ambient noise, making them nonlinear and non-stationary in nature. In recent years, the application of Empirical Mode Decomposition(EMD) technique to analyze nonlinear and non-stationary signals has gained much attention. It is an empirical approach to decompose a signal into a set of oscillatory modes known as intrinsic mode functions(IMFs). In general, Hilbert transform is used in EMD for the identification of oscillatory signals. In this paper a new EMD algorithm is proposed using FFT to identify and extract the acoustic signals available in the underwater channel that are corrupted due to various ambient noises over a range of 100 Hz to 10 kHz in a shallow water region. Data for analysis are collected at a depth of 5 m and 10 m offshore Chennai at the Bay of Bengal. The algorithm is validated for different sets of known and unknown reference signals. It is observed that the proposed EMD algorithm identifies and extracts the reference signals against various ambient noises. Significant SNR improvement is also achieved for underwater acoustic signals.

关键词： EMD IMF SNR ambient noises underwater acoustic signals FFT