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Graphene-platinum nanocomposite as a sensitive and selective voltammetric sensor for trace level arsenic quantification

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International Journal of Smart and Nano Materials 2014年第1期5卷 17-32页

作者： R.Kempegowda D.antony P.Malingappa Department of Chemistry Bangalore UniversityCentral College CampusBangalore 560001India Raman Research Institute C.V.Raman AvenueBangalore 560080India

A simple protocol for the chemical modification of graphene with platinum nanoparticles and its subsequent electroanalytical application toward sensitive and selective determination of arsenic has been *** modification was carried out by the simultaneous and sequential chemical reduction of graphene oxide and hexachloroplatinic acid in the presence of ethylene glycol as a mild reducing *** synthesized graphene-platinum nanocomposite(Gr-nPt)has been characterized through infrared spectroscopy,x-ray diffraction study,field emission scanning electron microscopy and cyclic voltammetry(CV)*** and square-wave anodic stripping voltammetry have been used to quantify *** proposed nanostructure showed linearity in the concentration range 10-100 nM with a detection limit of 1.1 *** proposed sensor has been successfully applied to measure trace levels of arsenic present in natural sample matrices like borewell water,polluted lake water,agricultural soil,tomato and spinach leaves.

关键词： arsenic graphene-platinum nanocomposite chemical modification square-wave anodic stripping voltammetry spinach leaves

Design of Optical Filter Using Bald Eagle Search Optimization Algorithm

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Intelligent Automation & Soft Computing 2023年第4期36卷 1215-1226页

作者： L.Jegan antony Marcilin N.M.Nandhitha Research Scholar Department of ECESathyabama Institute of Science and TechnologyChennai600119India

Controlled thermonuclear reactors require consistent monitoring of plasma in the toroidal *** working conditions of such machines can be monitored by analyzing its *** wavelengths such as 656.3,486.1,464.7 nm are quite signiﬁcant which are used for health monitoring of thermonuclear *** optical thinﬁlmﬁlters which work on construc-tive and destructive interference are the ideal ***ﬁlters are multi-layered with a pair of high and low refractive index dielectric ***ﬁcantly high transmission index at the desired wavelength and relatively low transmission at the other wavelengths are *** this as the objective,it is necessary to design theﬁ*** optimization techniques are used for identifying the suitable design of theﬁ*** choose the parameter combination that provides the most excellent performance,optimization of the design para-meters is *** goal of this work is to improve the optical bandﬁlter using the Bald eagle search optimization(BES)*** ideal design is determined by assessing several characteristics such as thickness,refractive index,Full-Width at Half-Maximum(FWHM),and the impact of choosing optical properties,which increases transmission ***,an alternate multi-layer stack with 28,30,and 32 layers is created by altering the thickness while keeping the dielectric substances high and low refractive indices *** adjusting the thickness of each layer,the BES algorithm achieves the best practical *** proposed method is implemented using MATLAB and the outcomes show the efﬁcacy of the proposed *** transmittance,reﬂectance,and FWHM using the pro-posed BES are found to be 99.9356%,0.065%,and 1.2 nm respectively.

关键词： Optical filter dielectricmaterial bandpassfilter baldeagle optimization algorithm thickness and refractive index

Capacitating local governments for the digital earth vision:lessons learnt from the role of municipalities in the South African spatial data infrastructure

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International Journal of Digital Earth 2021年第12期14卷 1897-1917页

作者： Lindy-Anne Siebritz Ahmad Desai Serena Coetzee antony K.Cooper National Geo-Spatial Information Department of AgricultureRural Development and Land ReformCape TownSouth Africa Department of Geography Geoinformatics and MeteorologyUniversity of PretoriaPretoriaSouth Africa Smart Places CSIRPretoriaSouth Africa

The Digital Earth vision foresees the availability and accessibility of geospatial information to achieve the goals of sustainable development,economic growth and social *** the case of urban areas,upto-date geospatial information is essential for managing a city towards achieving these *** rapid shift from rural to urban areas globally puts pressure on local governments and they often struggle to find and organise the resources required to collect and maintain geospatial information that can help to address urban growth challenges.A spatial data infrastructure(SDI)can facilitate the availability and accessibility of geospatial information towards addressing national objectives,however,the involvement of local governments in an SDI can be a *** this paper,we critique the role of municipalities against the backdrop of the developments of the South African SDI(SASDI)to *** critique identifies five high-level shortcomings of the SASDI that have led to the limited participation of *** on the shortcomings,we provide recommendations for capacitating municipalities through SASDI so that the Digital Earth vision can also be achieved for *** recommendations are aimed at involving the local sphere of government in a national SDI and are equally applicable to other countries.

关键词： SDI SASDI municipalities service delivery data governance

The application of Fourier transform mid-infrared(FTIR) spectroscopy to identify variation in cell wall composition of Setaria italica ecotypes

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Journal of Integrative Agriculture 2017年第6期16卷 1256-1267页

作者： Christopher Brown antony P.Martin Christopher P.L.Grof Centre for Plant Science School of Environmental and Life Sciences University of Newcastle Newcastle 2308 Australia Light Sheet Microscopy Unit Hunter Medical Research Institute Newcastle 2305 Australia

Cell wall composition in monocotyledonous grasses has been identified as a key area of research for developing better feedstocks for forage and biofuel *** viridis and its close domesticated relative Setaria italica have been chosen as suitable monocotyledonous models for plants possessing the C4 pathway of photosynthesis including sorghum,maize,sugarcane,switchgrass and Miscanthus×*** partial least squares regression（PLSR）models to predict *** stem composition have been generated,based upon Fourier transform mid-infrared（FTIR）spectra and calibrated with wet chemistry determinations of ground *** stem material measured using a modified version of the US National Renewable Energy Laboratory（NREL）acid hydrolysis *** models facilitated a high-throughput screening analysis for glucan,xylan,Klason lignin and acid soluble lignin（ASL）in a collection of 183 natural *** variants and clustered them into classes,some possessing unique *** predictive models provide a highly efficient screening tool for large scale breeding programs aimed at identifying lines or mutants possessing unique cell wall *** encoding key catalytic enzymes of the lignin biosynthesis pathway exhibit a high level of conservation with matching expression profiles,measured by RT-q PCR,among accessions of ***,which closely mirror profiles observed in the different developmental regions of an elongating internode of *** by RNASeq.

关键词： monocotyledonous C4 grasses lignin biosynthesis Fourier transform mid-infrared spectroscopy Setaria italica

Factors Jeopardizing the Success of Public-private Partnership Projects in Kenya,Case Study of Roads and Railways Infrastructure Investments

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Factors Jeopardizing the Success of Public-private Partnersh...

作者： Njoroge antony Njuguna 湖南大学

学位级别：硕士

世界各国政府都面临着为其公民提供公共服务的压力,这些基础设施投资项目需要大量资金,在大多数情况下,特别发展中国家是无法获得缺口巨大的基础建设资金,因此,许多国家决定与私营部门合作提供公共服务。PPP模式,即政府和社会资本合作,... 详细信息

世界各国政府都面临着为其公民提供公共服务的压力,这些基础设施投资项目需要大量资金,在大多数情况下,特别发展中国家是无法获得缺口巨大的基础建设资金,因此,许多国家决定与私营部门合作提供公共服务。PPP模式,即政府和社会资本合作,是公共基础设施中的一种项目运作模式。目前在全球范围内,PPP模式在基础设施投资越来越受欢迎。PPP模式一项长期合同协议,私营实体按照合作合同在规定时间内提供公共服务,并由最终用户、公共部门或两者的混合体支付费用。私营部门按照订约政府当局提供的规范提供公共服务。肯尼亚采用在公路和铁路基础设施建设中采用了PPP模式,表明政府可以通过这种模式为该国提供高质量、高成本效益和交付及时的公共服务。然而,在某些情况下,PPP项目面临不能如期交付的风险。这些项目由于成本增加、无法满足合同文件中规定的要求和标准。本研究以肯尼亚国家公路和铁路基础设施投资PPP项目为案例研究,着重分析了这些PPP项目中的风险。本研究的目的是调查肯尼亚PPP项目伙伴关系的监管环境、影响肯尼亚PPP项目的经济因素、调查肯尼亚PPP项目采购过程以及阻碍肯尼亚PPP项目实施的因素。研究者采用描述性和个案研究的方法,对所研究的主题进行了完整的描述,其中选取了财政部、PPPU的30名受访者,对三个研究案例,即Thika高速公路、Nakuru-Nairobi公路和Garissa-Malindi公路,进行了调查问卷和实地研究。调查结果显示,调查对象的回答率为95.65%,所收到的调查问卷加上实地调查的数据足以进行数据分析。对收集的数据进行了分析,并以百分比、表格、频率和图表的形式进行统计。从调查数据中可以明显看出,许多在PPPU工作的调查对象都有经验和所需的学历,这些研究者寻求对PPP项目所面临挑战的回应。分析结果表明:经济因素、采购流程、监管环境和项目实施能力是影响肯尼亚公路和铁路PPP项目的主要风险因素。监管环境风险因素包括PPP项目政策和战略不切实际、政府的PPP项目政策和战略存在缺陷、法律制度框架薄弱和不足,以及政治上的不情愿等因素。分析结果还表明,这些风险因素之间存在较强的相关性,这意味着,其中某一个因素的影响将影响所有其他因素,从而导致整个项目失败。

关键词：政府和社会资本合作(PPP) 公路铁路合同授权私营部门经济效益

Apigenin's anticancer properties and molecular mechanisms of action： Recent advances and future prospectives

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Chinese Journal of Natural Medicines 2017年第5期15卷 321-329页

作者： Jumah Masoud Mohammad SALMANI ZHANG Xiao-Ping Joe antony JACOB CHEN Bao-An Department of Hematology and Oncology Zhongda Hospital School of Medicine Southeast University

Cancer is a major health concern and leading burden on economy worldwide. An increasing effort is devoted to isolation and development of plant-derived dietary components as effective chemo-preventive products. Phytochemical compounds from natural resources such as fruits and vegetables are responsible for decreasing the risk of certain cancers among the consuming populations. Apigenin, a flavonoid phytochemical found in many kinds of fruits and vegetables, has been shown to exert significant biological effects, such as anti-oxidant, anti-inflammatory and most particularly anti-neoplastic properties. This review is intended to summarize the most recent advances in the anti-proliferative and chemo-preventive effects of apigenin in different cancer models. Analysis of the data from the studied cancer models has revealed that apigenin exerts its anti-proliferative effects through multiple and complex pathways. This guided us to discover some controversial results about the exact role of certain molecular pathways such as autophagy in the anticancer effects of apigenin. Further, there were cumulative positive evidences supporting the involvement of certain pathways such as apoptosis, ROS and DNA damage and repair. Apigenin possesses a high potential to be used as a chemosensitizing agent through the up-regulation of DR5 pathway. According to these preclinical findings we recommend that further robust unbiased studies should consider the possible interactions between different molecular pathways.

关键词： Apigenin Anticancer Flavonoid Mechanism of action

Engineering Novel Molecular Beacon Constructs to Study Intracellular RNA Dynamics and Localization

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Genomics, Proteomics & Bioinformatics 2017年第5期15卷 279-286页

作者： Zhao Ma Xiaotian Wu Christopher J.Krueger antony K.Chen Department of Biomedical Engineering College of Engineering Peking University Beijing 100871 China Wallace H Coulter Department of Biomedical Engineering Georgia Institute of Technology Atlanta GA 30332 USA

With numerous advancements in novel biochemical techniques, our knowledge of the role of RNAs in the regulation of cellular physiology and pathology has grown significantly over the past several decades. Nevertheless, detailed information regarding RNA processing, trafficking, and localization in living cells has been lacking due to technical limitations in imaging single RNA transcripts in living cells with high spatial and temporal resolution. In this review, we discuss tech- niques that have shown great promise for single RNA imaging, followed by highlights in our recent work in the development of molecular beacons （MBs）, a class of nanoscale oligonucleotide-probes, for detecting individual RNA transcripts in living cells. With further refinement of MB design and development of more sophisticated fluorescence microscopy techniques, we envision that MB-based approaches could promote new discoveries of RNA functions and activities.

关键词： Y-O-methyl RNA Phosphorothioate Molecular beacon RNA dynamics Single-molecule RNAimaging

REVIEW OF HIGH LEVEL FAULT MODELING APPROACHES FOR MIXED-SIGNAL SYSTEMS

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Journal of Electronics(China) 2010年第4期27卷 490-497页

作者： Xia Likun Ian Bell antony Wilkinson Department of Electrical ＆ Electronic Engineering Universiti Teknologi Petronas 31750 Tronoh Perak Malaysia Department of Engineering Hull University Cottingham Road United Kingdom HU57RX

In the modern analogue design, Transistor Level Fault Simulation (TLFS) plays the im-portant part since every fault in the whole circuit has to be simulated at that level. Unfortunately, it is a very CPU intensive task even though it maintains the high accuracy. Therefore, High Level Fault Modeling (HLFM) and High Level Fault Simulation (HLFS) are required in order to alleviate the efforts of simulation. In this paper, different HLFM approaches are reviewed at the device level during last two decades. We clarify their domains of application and evaluate their strengths and current limitations. We also analyze causes of faults and introduce various test approaches.

关键词： High Level Fault Modeling (HLFM) Automated Model Generation (AMG)

Review of different fault detection methods and their impact on pre-emptive VSC-HVDC dc protection performance

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High Voltage 2017年第4期2卷 211-219页

作者： Bin Chang Oliver Cwikowski Mike Barnes Roger Shuttleworth antony Beddard Paul Coventry Global Energy Interconnection Research Institute Future Science ParkBeijing 102209People's Republic of China The University of Manchester Oxford RoadManchester M139PLUK National Grid National Grid HouseWarwick CV346DAUK

Multi-terminal voltage-sourced converters(VSC)high-voltage direct current(HVDC)transmission system is expected to play a vital role in future power *** with ac power transmission,dc transmission is more vulnerable to faults due to low dc-side impedances and sensitive power electronics in the *** protection issues must be tackled before any multi-terminal VSC-HVDC grid can be *** multi-terminal VSC-HVDC system is studied in detail using switching models for two-level converters,detailed equivalent models for the modular multi-level converters,detailed hybrid circuit breaker switching models and frequency-dependent phase models for dc *** such high-fidelity system models,a systematic study of HVDC fault protection methodologies in more detail than previous studies is *** is the first comprehensive study that includes pre-emptive circuit breaker *** results presented in this study underline the benefits of such a detailed treatment of the breaker,and of considering it as part of a fast power electronics system rather than isolated dc *** study identifies the best existing fault detection method and tests it *** order to further improve post-fault system recovery response,which is a key but often neglected part of previous studies,a novel bump-less transfer control has been implemented in the converters.

关键词： fault system power