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污水中As(Ⅲ)As(Ⅴ)和总砷的测定—石墨炉原子吸收法和阳极溶出伏安法

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环境科学与管理 1983年第2期 62-67页

作者： k·s·subramanian 张寒琦吉林大学化学系

引言近几年,特别是认识到饮水中的砷是一种对身体非常有害的物质以后,人们对水体中砷及其形态的分析产生了极大的兴趣。例如,皮肤色素的变化、角质物,癌和神经作用都与饮水中砷的污染有关。现在已查明,砷的潜在毒性与其氧化态有关,因此... 详细信息

引言近几年,特别是认识到饮水中的砷是一种对身体非常有害的物质以后,人们对水体中砷及其形态的分析产生了极大的兴趣。例如,皮肤色素的变化、角质物,癌和神经作用都与饮水中砷的污染有关。现在已查明,砷的潜在毒性与其氧化态有关,因此需要建立鉴别砷的不同氧化态的分析方法。在天然水中,包括饮用水中,砷的主要氧化态形式是As(Ⅲ)和As(Ⅴ)。

关键词：阳极溶出伏安法 ETA 反向溶出伏安法电化学分析 MIBk 砷浓度 As APDC 络合试剂灰化温度镍基体 HCI 原子吸收法热解石墨管

Nucleoside modified mRNA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

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Neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： krisztián Pajer Tamás Bellák Antal Nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(khyeam et al.,2021).

关键词： injured capacity modified

Intelligent Deployment Model for Target Coverage in Wireless sensor Network

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Intelligent Automation & soft Computing 2023年第1期35卷 739-754页

作者： k.subramanian s.shanmugavel Department of ECE National Engineering CollegeKovilpattiTamilnaduIndia

Target coverage and continuous connection are the major recital factors for Wireless sensor Network(WsN).several previous research works studied various algorithms for target coverage difficulties;however they lacked to focus on improving the network’s life time in terms of *** research work mainly focuses on target coverage and area coverage problem in a heterogeneous WsN with increased network *** dynamic behavior of the target nodes is unpredictable,because the target nodes may move at any time in any direction of the ***,target coverage becomes a major problem in WsN and its *** solve the issue,this research work is motivated to design and develop an intelligent model named Distributed Flexible Wheel Chain(DFWC)model for efficient target coverage and area coverage in WsN *** number of target nodes is covered by minimum number of sensor nodes that can improve energy *** be specific,DFWC motivated at obtaining lesser connected target coverage,where every target is available in the monitoring area is covered by a smaller number of sensor *** simulation results show that the proposed DFWC model outperforms the existing models with improved performance.

关键词： WsN target coverage DF WC network coverage

Experimental Investigation for NO_x Emission Reduction in Hydrogen Fueled spark Ignition Engine Using spark Timing Retardation, Exhaust Gas Recirculation and Water Injection Techniques

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Journal of Thermal science 2019年第4期28卷 789-800页

作者： JEERAGAL Ramesh k.A.subramanian Engines and Unconventional Fuels Laboratory Centre for Energy Studies IIT Delhi

The experimental tests were carried out on a single cylinder hydrogen fueled spark ignition(sI)generator set with different spark timings(4-20℃A bTDC),exhaust gas recirculation(EGR)up to 28% by volume and water injection up to 1.95 kg/h(maximum water to fuel mass ratio of 8:1).The engine speed was kept constant of 3000 r/*** NOx emission and thermal efficiency of engine with gasoline and hydrogen fuel operation at 1.4 kW power output are 5 g/kWh and 12.1 g/kWh,and 15% and 20.9% *** order to reduce the NOx emission at source level,retarding spark timing,exhaust gas recirculation(EGR),and water injection techniques were *** emission decreased with spark timing retardation,EGR,and water *** emission with hydrogen at 1.4 kW power output decreased from 12.1 g/kWh with maximum brake torque(MBT)spark timing(10℃A bTDC)to 8.1 g/kWh with retarded spark timing(4℃A bTDC)due to decrease in the in-cylinder peak pressure and *** Nox emission decreased to 6.1 g/kWh with 20% EGR due to thermal and chemical dilution ***,thermal efficiency decreased about 33% and 17% with spark timing retardation and 20EGR respectively as compared to that of MBT spark ***,in the case of water injection,the NOx emission decreased significantly without affecting the thermal efficiency of the engine and it is 5.6 g/kWh with water-hydrogen ratio of 4:1(water flow rate of 0.92 kg/h).Water injection is the best suitable method to reduce the NOx emission in a hydrogen fueled engine compared with the spark timing retardation and EGR technique.

关键词： hydrogen spark ignition engine spark timing exhaust gas recirculation NOx emission water injection

Effect of Processing Parameters on Crystal Orientation of Microstructure in High Niobium-Bearing Microalloyed steel

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Journal of Iron and steel Research International 2011年第S1期18卷 466-470页

作者： subramanian s V McMaster University HamiltonOntarioCanada

The present studies are aimed at understanding the effect of cooling rate and prior strain on the evolution of morphology,orientation relationship (OR) and variant selection in pipeline steel with 0.09wt% *** identical prior austenite grain,all products include granular bainite(GB) by coherent transformation,keep orientation relationship (OR) with parent *** cooling and large deformation below T nr both can raise drive force of coherent transformation and weaken variants selection,and it can generate higher frequency of high angle boundaries (HABs) (≥15degree).Moreover,large deformation by few passes below T nr can accelerate nucleation of ferrite grains at the austenite boundary by incoherent *** fine grains haven’t OR with prior austenite grain in any side of boundary,and exhibit significant misorientations between themselves.

关键词： orientation relationship EBsD low carbon bainite microalloyed steel ferrite grain

Recrystallization Behavior Design for Controlling Grain size in strip Rolling Process

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Journal of Iron and steel Research International 2008年第1期15卷 39-44页

作者： ZHU Guo-hui s V subramanian school of Materials science and Engineering Anhui University of Technology Ma＇anshan 243002 Anhui China Department of Materials science and Engineering McMaster University Hamilton LSS 4A7 Ontario Canada

To promote effectively dynamic recrystallization and obtain a homogeneous distribution of ultrafine grain size in strip finish rolling process,the behavior of static and dynamic recrystallization must be appropriately designed to provide an ultrafine austenite microstructure without mixed grain *** design of rolling schedule was analyzed based on the control of the recrystallization behavior to achieve ultrafine grain size in the strip rolling process of niobium microalloyed *** experimental simulations were presented to validate the twice dynamic recrystallization design to achieve ultrafine grain size control.

关键词： twice dynamic recrystallization critical strain dynamic recrystallization ultrafine grain size

Design and Analysis of Novel Three-Phase PFC for IM Drives

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Intelligent Automation & soft Computing 2023年第1期35卷 231-241页

作者： V.kavitha k.subramanian VIT University VelloreTamil Nadu632014India Faculty of school of Electrical Engineering VIT UniversityVelloreTamil Nadu632014India

Induction motor drives(IMDs)can achieve high performance levels comparable to dc motor drives.A major problem in getting high dynamic performance in an IMD is the coupling between theflux and torque producing components of stator *** is successfully overcome in FOC(Field-Oriented Control)IM,making it to the industry standard *** performance of an IMD with an improved power quality converter at the front end is presented in this *** the IMD,boost converter is employed to reduce power quality difficulties at the utility *** the boost converter contains only one switch,it results in a low processing time and *** ensure sinusoidal supply currents with high PF(Power Factor)and minimal THD(Total Harmonic Distortion),a novel PFC(Power Factor Corrector)control technique is *** enhance the performance of the converter and to lower distortions at the motor side,PI(Proportional Integral)controller is incorporated at the PFC *** it controls the DC bus *** proposed boost converter improves power quality by lowering overall harmonic distortion of AC mains current,improving power factor correction,and regulating dc-link *** is designed,modelled,and simulated in the MATLAB/simulink *** a DsP(Digital signal Processor),the suggested system’s performance is experimentally *** system’s performance is evaluated for speed and load torque,and the power quality indices are determined to meet IEEE-519 standards under all operating *** the obtained results,it is evident that the proposed system mitigates the power quality issues effectively.

关键词： Induction motor PI controller boost converter power factor corrector

Biotechnological interventions for the sustainable management of a global pest,whitefly(Bemisia tabaci)

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Insect science 2021年第5期28卷 1228-1252页

作者： Archna suhag Honey Yadav Darshna Chaudhary s.subramanian Ranjana Jaiwal Pawan k.Jaiwal Department of Zoology M.D.UniversityRohtakIndia Centre for Biotechnology M.D.UniversityRohtakIndia Division of Entomology Indian Agriculture Research InstituteNew DelhiIndia

Whiteflies(Bemisia tabaci)are polyphagous invasive hemipteran insects that cause serious losses of important crops by directly feeding on phloem sap and transmitting pathogenic *** insects have emerged as a major threat to global agriculture and food *** synthesized insecticides are currently the only option to control whiteflies,but the ability of whiteflies to evolve resistance against insecticides has made the management of these insects very *** host-plant resistance against whiteflies identified in some crop plants has not been exploited to a great *** engineering approaches,such as transgenics and RNA interference(RNAi),are potentially useful for the control of *** plants harboring insecticidal toxins/lectins developed via nuclear or chloroplast transformation are a promising vehicle for whitefly ***-stranded RNAs(dsRNAs)of several insect genes,delivered either through microinjection into the insect body cavity or orally via an artificial diet and transiently or stably expressed in transgenic plants,have controlled whiteflies in model plants and in some crops at the laboratory level,but not at the field *** this review,we highlight the merits and demerits of each delivery method along with strategies for sustained delivery of dsRNAs via fungal entomopathogen/endosymbiont or nontransgenic RNAi approaches,foliar sprays,root absorption or nanocarriers as well as the factors affecting efficient RNAi and their biosafety *** sequencing and transcriptome studies of whitefly species are facilitating the selection of appropriate genes for RNAi and gene-editing technology for the efficient and resilient management of whiteflies and their transmitted viruses.

关键词： Bemisia tabaci.,gene editing management nanotechnology RNAi transgenesis

Machine learning enabled autonomous microstructural characterization in 3D samples

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npj Computational Materials 2020年第1期6卷 1654-1662页

作者： Henry Chan Mathew Cherukara Troy D.Loeffler Badri Narayanan subramanian k.R.s.sankaranarayanan Center for Nanoscale Materials Argonne National LaboratoryArgonneILUSA Department of Mechanical Engineering University of LouisvilleLouisvilleKYUSA Department of Mechanical and Industrial Engineering University of Illinois at ChicagoChicagoILUSA

We introduce an unsupervised machine learning(ML)based technique for the identification and characterization of microstructures in three-dimensional(3D)samples obtained from molecular dynamics simulations,particle tracking data,or *** technique combines topology classification,image processing,and clustering algorithms,and can handle a wide range of microstructure types including grains in polycrystalline materials,voids in porous systems,and structures from self/directed assembly in soft-matter complex *** technique does not require a priori microstructure description of the target system and is insensitive to disorder such as extended defects in polycrystals arising from line and plane *** demonstrate quantitively that our technique provides unbiased microstructural information such as precise quantification of grains and their size distributions in 3D polycrystalline samples,characterizes features such as voids and porosity in 3D polymeric samples and micellar size distribution in 3D complex *** demonstrate the efficacy of our ML approach,we benchmark it against a diverse set of synthetic data samples representing nanocrystalline metals,polymers and complex fluids as well as experimentally published characterization *** technique is computationally efficient and provides a way to quickly identify,track,and quantify complex microstructural features that impact the observed material behavior.

关键词： microstructure polycrystalline porosity