检索结果-南通市图书馆

Numerical investigations on HCCI engine with increased induction induced swirl and engine speed

Journal of Central South University 2015年第10期22卷 3837-3848页

作者： T.karthikeya Sharma G.Amba Prasad Rao k.madhu murthy Department of Mechanical Engineering NIT

Homogeneous charge compression ignition(HCCI) mode of combustion is popularly known for achieving simultaneous reduction of NOx as well as soot emissions as it combines the compression ignition(CI) and spark ignition(SI) engine features. In this work, a CI engine was simulated to work in HCCI mode and was analyzed to study the effect of induction induced swirl under varying speeds using three-zone extended coherent flame combustion model(ECFM-3Z, compression ignition) of STAR-CD. The analysis was done considering speed ranging from 800 to 1600 r/min and swirl ratios from 1 to 4. The present study reveals that ECFM-3Z model has well predicted the performance and emissions of CI engine in HCCI mode. The simulation predicts reduced in-cylinder pressures, temperatures, wall heat transfer losses, and piston work with increase in swirl ratio irrespective of engine speed. Also, simultaneous reduction in CO2 and NOx emissions is realized with higher engine speeds and swirl ratios. Low speeds and swirl ratios are favorable for low CO2 emissions. It is observed that increase in engine speed causes a marginal reduction in in-cylinder pressures and temperatures. Also, higher turbulent energy and velocity magnitude levels are obtained with increase in swirl ratio, indicating efficient combustion necessitating no modifications in combustion chamber design. The investigations reveal a total decrease of 38.68% in CO2 emissions and 12.93% in NOx emissions when the engine speed increases from 800 to 1600 r/min at swirl ratio of 4. Also an increase of 14.16% in net work done is obtained with engine speed increasing from 800 to 1600 r/min at swirl ratio of 1. The simulation indicates that there is a tradeoff observed between the emissions and piston work. It is finally concluded that the HCCI combustion can be regarded as low temperature combustion as there is significant decrease in in-cylinder temperatures and pressures at higher speeds and higher swirl ratios.

关键词： HCCI engine ECFM-3Z swirl ratio emissions and performance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling Diesel Engine Flow Processes For Performance and Emissions

Modeling Diesel Engine Flow Processes For Performance and Em...

引用

International Conference on Emerging Trends in Computer and Electronics Engineering(ICETCEE’2012);International Conference on Advancements in Electrical and Power Engineering(ICAEPE’2012);International Conference on Trends in Industrial and Mechanical Engineering(ICTIME’2012);International Conference on Advances in Biological and Pharmaceutical Sciences (ICABPS’2012);International Conference on Chemical,Civil and Environment engineering(ICCEE’2012);International Conference on Management,Applied and Social Sciences(ICMASS’2012)

作者： B.Venkateshwar Rao k.madhu murthy G.Amba Prasad Rao the National Institute of Technology the Dept. of Mechanical Engineering at National Institute of Technology

The paper deals with the simulation of typical direct injection diesel engine processes following phenomenological modeling considering heat transfer, heat losses （both convection and radiation）, and variable specific heats. A double-Weibe function is used to model the heat release. It was found that early injection timing leads to higher levels of pressure and temperature in the cylinder. Fuel injection timing and engine speed, compression ratio, inlet charge pressure and temperature are observed to be pertinent parameters affecting diesel engine performance. Effect of exhaust gas recirculation on the formation and emission of oxides of nitrogen and soot density are also studied. High speed diesel fuel C10.8H18.7 is considered for calculations. Numerical experiments are performed by writing a computer code in C++ and heat release （both pre-mixed and diffusion phases）, in-cylinder pressure and temperature histories and emissions are predicted while incorporating different engine parameters. All trends obtained are in accordance with the well-established literature. It is observed that fuel injection timing and fraction of exhaust gas recirculation as critical factors in affecting engine performance as well as emissions.

关键词： Diesel Engine Phenomenological Model Wiebe Function EGR Performance Exhaust Emissions

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Colorimetric Sensor for Detection of Tabun Mimic Diethyl Cyanophosphonate

引用

Journal of Analysis and Testing 2024年第3期8卷 374-384页

作者： madhu Bala Dheeraj Pandey Nikita Patel Sheetal Yadav Abha Sharma Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research RaebareliTransit Campus

Herein,a colorimetric chemosensor （probe 7） was designed and synthesized for sensing diethyl cyanophosphonate （DCNP）,a Tabun nerve agent *** sensitive,selective,fast response and photostable probe 7 in dimethylsulfoxide （DMSO）responded to DCNP at low concentrations with visual naked eye color change from pink to pale yellow and displayed unresponsive behaviour against various interferences except for copper ions,which can be di?erentiated by adding ethylene diamine where the yellow color persisted in the case of DCNP but turned to pink in the case of copper ***,the yellow aqueous solution of probe 7 at pH 10 and 12 turned colorless against the response of *** limit of detection（LOD） of probe 7 was found to be 50 nmol/L in an aqueous basic solution at pH 10 for the detection of *** formation of the cyclized product was elucidated by1H and31P NMR nuclear magnetic resonance (1H NMR,31P NMR),Fourier transform infrared spectroscopy （FTIR）,and high-resolution mass spectrometry （HRMS） ***?lter paper and silica plate loaded with probe 7 were fabricated for real-time and on-site detection of DCNP.

关键词： Chemosensor Colorimetric Fluorescence Tabun mimic

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cr-induced fusion reactions to synthesize superheavy elements

引用

Nuclear Science and Techniques 2024年第5期35卷 122-130页

作者： S.madhu H.C.Manjunatha N.Sowmya B.M.Rajesh L.Seenappa R.S.Susheela Department of Physics R V College of EngineeringBangalore 560074India Visvesvaraya Technological University BelagaviKarnataka 590018India Department of Physics Government First Grade CollegeSrinivasapurKarnataka 563135India Department of Physics Government First Grade CollegeDevanahallyKarnataka 562110India Department of Physics Government First Grade CollegeMulbagalKarnataka 563131India Department of Physics Government First Grade collegeNanjangudOoty RoadMysore 571301India

We investigated ^(50,52-54)Cr-induced fusion reactions for the synthesis of the superheavy element in the 104≤Z≤122 *** cross sections produced in this investigation using ^(54)Cr projectiles were compared with those obtained in prior *** estimated cross sections from this analysis are consistent with the findings of prior *** the current study,the predicted cross section was found to be 42fb at 236 MeV for ^(53)Cr+^(243)Am,23.2 fb at 236 MeV for ^(54)Cr+^(247)Cm,95.6 fb at 240 MeV for ^(53)Cr+248Bk,and 1.33 fb at 242 MeV for ^(53)Cr+***,these projected cross sections with excitation energy and beam energy will be useful in future Cr-induced fusion reaction investigations.

关键词： Fusion cross sections Compound nucleus formation probability Survival probability Evaporation residue cross sections

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction of Geopolymer Concrete Compressive Strength Using Convolutional Neural Networks

引用

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1455-1486页

作者： kolli Ramujee Pooja Sadula Golla madhu Sandeep kautish Abdulaziz S.Almazyad Guojiang Xiong Ali Wagdy Mohamed Department of Civil Engineering VNR Vignana Jyothi Institute of Engineering and TechnologyHyderabadTelangana500090India Department of Information Technology VNR Vignana Jyothi Institute of Engineering and TechnologyHyderabadTelangana500090India Department of Computer Science LBEF Campus(Asia Pacific University of Technology&InnovationMalaysia)Kathmandu44600Nepal Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityP.O.Box 51178Riyadh11543Saudi Arabia Guizhou key Laboratory of Intelligent Technology in Power System College of Electrical EngineeringGuizhou UniversityGuiyang550025China Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGiza12613Egypt Applied Science Research Center Applied Science Private UniversityAmmanJordan

Geopolymer concrete emerges as a promising avenue for sustainable development and offers an effective solution to environmental *** attributes as a non-toxic,low-carbon,and economical substitute for conventional cement concrete,coupled with its elevated compressive strength and reduced shrinkage properties,position it as a pivotal material for diverse applications spanning from architectural structures to transportation *** this context,this study sets out the task of using machine learning(ML)algorithms to increase the accuracy and interpretability of predicting the compressive strength of geopolymer concrete in the civil engineering *** achieve this goal,a new approach using convolutional neural networks(CNNs)has been *** study focuses on creating a comprehensive dataset consisting of compositional and strength parameters of 162 geopolymer concrete mixes,all containing Class F fly *** selection of optimal input parameters is guided by two distinct *** first criterion leverages insights garnered from previous research on the influence of individual features on compressive *** second criterion scrutinizes the impact of these features within the model’s predictive *** to enhancing the CNN model’s performance is the meticulous determination of the optimal *** a systematic trial-and-error process,the study ascertains the ideal number of epochs for data division and the optimal value of k for k-fold cross-validation—a technique vital to the model’s *** model’s predictive prowess is rigorously assessed via a suite of performance metrics and comprehensive score ***,the model’s adaptability is gauged by integrating a secondary dataset into its predictive framework,facilitating a comparative evaluation against conventional prediction *** unravel the intricacies of the CNN model’s learning trajectory,a loss plot is deployed to elucidate its learning rat

关键词： Class F fly ash compressive strength geopolymer concrete prediction deep learning convolutional neural network

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Recent updates on nano-phyto-formulations based therapeutic intervention for cancer treatment

引用

Oncology Research 2024年第1期32卷 19-47页

作者： ABHISHEk WAHI MAMTA BISHNOI NEHA RAINA MEGHNA AMRITA SINGH PIYUSH VERMA PIYUSH kUMAR GUPTA GINPREET kAUR HARDEEP SINGH TULI madhu GUPTA Department of Pharmaceutics School of Pharmaceutical SciencesDelhi Pharmaceutical Sciences and Research University(DPSRU)Pushp ViharNew Delhi110017India Department of Pharmaceutical Sciences Gurugram UniversityHaryana122003India Department of Life Sciences Sharda School of Basic Sciences and ResearchSharda UniversityGreater NoidaUttar Pradesh201310India Department of Biotechnology Graphic Era(Deemed to be University)DehradunUttarakhand248002India Department of Pharmacology Shobhaben Pratapbhai Patel School of Pharmacy&Technology ManagementSVKM’s NMIMSVile Parle(West)Mumbai400056India Department of Bio-Sciences and Technology Maharishi Markandeshwar Engineering CollegeMaharishi Markandeshwar(Deemed to be University)MullanaAmbala133207India

Cancer is a leading cause of death globally,with limited treatment options and several *** agents often result in toxicity which long-term conventional *** are natural constituents that are more effective in treating various diseases with less toxicity than the chemotherapeutic agents providing alternative therapeutic approaches to minimize the *** phytoconstituents act in several ways and deliver optimum effectiveness against ***,the effectiveness of phyto-formulations in the management of cancers may be constrained due to challenges related to inadequate solubility,bioavailability,and *** presents a promising avenue for transforming current cancer treatment methods through the incorporation of phytochemicals into nanosystems,which possess a range of advantageous characteristics such as biocompatibility,targeted and sustained release capabilities,and enhanced protective *** holds significant potential for future advancements in cancer ***,this review aims to provide intensive literature on diverse nanocarriers,highlighting their applications as cargos for phytocompounds in ***,it offers an overview of the current advancements in the respective field,emphasizing the characteristics that contribute to favourable outcomes in both in vitro and in vivo ***,clinical development and regulatory concerns are also discussed to check on the transformation of the concept as a promising strategy for combination therapy of phytochemicals and chemotherapeutics that could lead to cancer management in the future.

关键词： Phyto-formulations Cancer Nanocarriers Nanotechnology Clinical development

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Control of peak pressures of an HCCI engine under varying swirl and operating parameters

引用

Frontiers in Energy 2016年第3期10卷 337-346页

作者： T. kARTHIkEYA SHARMA G. AMBA PRASAD RAO k. madhu murthy Department of Mechanical Engineering NIT Warangal Warangal506004 India

The major advantages of homogeneous charge compression ignition （HCCI） are high efficiency in combination with low NOx-emissions. However, one of the major challenges with HCCI is the control of higher peak pressures which may damage the engine, limiting the HCCI engine life period. In this paper, an attempt is made to analyze computationally the effect of induction swirl in controlling the peak pressures of an HCCI engine under various operating parameters. A single cylinder 1.6 L reentrant piston bowl diesel engine is chosen. For computational analysis, the ECFM-3Z model of STAR - CD is considered because it is suitable for analyzing the combustion processes in SI and CI engines. As an HCCI engine is a hybrid version of SI and CI engines, the ECFM- 3Z model with necessary modifications is used to analyze the peak pressures inside the combustion chamber. The ECFM-3Z model for HCCI mode of combustion is validated with the existing literature to make sure that the results obtained are accurate. Numerical experiments are performed to study the effect of varying properties like speed of the engine, piston bowl geometry, exhaust gas recirculation （EGR） and equivalence ratio under different swirl ratios in controlling the peak pressures inside the combustion chamber. The results show that the swirl ratio has a considerable impact on controlling the peak pressures of HCCI engine. A reduction in peak pressures are observed with a swirl ratio of 4 because of reduced in cylinder temperatures. The combined effect of four operating parameters, i.e., the speed of the engine, piston bowl geometry, EGR, and equivalence ratio with swirl ratios suggest that lower intake temperatures, reentrant piston bowl, higher engine speeds and higher swirl ratios are favorable in controlling the peak pressures.

关键词： HCCI engine ECFM-3Z Swirl ratio peak pressures engine speed piston bowl geometry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Approaches for Optimal Planning of Energy Storage Units in Distribution Network and Their Impacts on System Resiliency

引用

CSEE Journal of Power and Energy Systems 2020年第4期6卷 816-833页

作者： Balaji Venkateswaran V Devender k.Saini madhu Sharma Department of Electrical and Electronics Engineering University of Petroleum and Energy StudiesDehradun 248007India

In the recent decade,a significant increase in the penetration level of renewable energy sources(RESs)into the distribution grid is evident due to the world’s shift towards clean energy and to increase the reliability or inboard manner resiliency of electrical distribution *** based microgrids are the most favorable option available,especially to enhance ***,the integration of RES over the distribution grid would hamper the grid stability due to its stochastic nature under normal *** extreme weather conditions,RES behavior is completely *** there is a need to eliminate the adverse effects caused by the RES and make the distribution grid more reliable and stable under normal and resilient *** address these issues,many researchers proposed several methods to place energy storage units(ESUs)and microgrids(RES integrated),which can support critical loads at an optimal location in the distribution system during normal and extreme conditions,*** aim of this article is to consolidate and review the research towards various approaches to formulate the problem(optimal location,allocation,and operation of ESU and microgrids to face regular and extreme weather condition)and tools to solve it for enhanced system flexibility and *** on the review,a generalized methodology has been designed to adapt the inputs and address both *** the end of the review,future aspects for ESU to strengthen resistance and resiliency of its own are presented,which can be helpful to further improve the reliability and resiliency of the distribution system.

关键词： Energy storage units(ESUs) electrical distribution grid resiliency renewable energy sources(RES)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Multi-objective optimization of feature selection using hybrid cat swarm optimization

引用

Science China(Technological Sciences) 2021年第3期64卷 508-520页

作者： GAO Xiao-Zhi NALLURI madhu Sudana Rao kANNAN k SINHAROY Diptendu School of Computing University of Eastern FinlandKuopio 70210Finland School of Engineering Department of MathematicsAmrita Vishwa VidyapeethamCoimbator 641112India School of Humanities and Sciences SASTRA UniversityThanjavur 612001India Department of Computer Science and Engineering National Institute of TechnologyMeghalayaShillong 793003India

With the pervasive generation of information from a wide range of sensors and devices,there always exist a large number of input features in databases,thus complicating machine learning problem ***,certain features are relatively impertinent to specific problems,which may degrade the performances of classifiers in terms of prediction accuracy,sensitivity,specificity,and recall *** main goal of a multi-objective optimization problem is to identify the subsets of the given *** this end,a hybrid cat swarm optimization(HCSO)algorithm is proposed in our paper for performance improvement of the basic cat swarm optimization(CSO)that incorporates guided and competitive&inherent characteristics into the original *** performance of HCSO has been tested by finding the optimal feature subset for 15 benchmark *** number of class labels for these datasets varies between 2 and *** time complexity analysis of both CSO and HCSO has also been ***,the performance of the proposed algorithm has been compared with that of simple CSO and other state-ofthe-art *** performances obtained by HCSO have an average 2.68%improvement with a standard deviation of *** maximum performance improvement is up to 10.09%in prediction *** on the same datasets,CSO has yielded improvements within the range of-7.27%to 8.51%with an average improvement 0.9%and standard deviation *** statistical tests carried out in the experiments prove that HCSO manifests a moderately better feature selection capacity than that of its counterparts.

关键词： feature selection competition cat swarm optimization guided search parameter evolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hot deformation behavior and processing maps of Ti-15Al-12Nb alloy

引用

Rare Metals 2022年第7期41卷 2316-2323页

作者： Ravindranadh Bobbili Vemuri madhu Defense Metallurgical Research Laboratory Hyderabad 500058India

The isothermal hot compression tests of Ti-15Al-12Nb alloy under wide range of strain rates(0.01-10.00 s^(-1)and deformation temperatures(950,1000,1050,and 1100℃)were carried out using Gleeble-3500 thermo-simulation machine.A constitutive equation represented as a function of temperature,strain rate and true strain was developed,and the hot deformation appar-ent activation energy is calculated to be about 453 kJ·mol^(-1).By employing dynamic material model(DMM),the processing maps of Ti-15Al-12Nb alloy at various strains were *** efficiency of about 57%for power dissipation is obtained at high temperature and low strain *** to the high power dissipation efficiency and excellent processing ability in dynamic recrystallization(DRX)zone for metal material,the optimum processing conditions are selected as the temperature range of 1050-1100℃and the strain rate range of 0.01-0.10 s^(-1).Using transmission electron microscopy(TEM)studies,it is found that the dislocation density is directly associated with the value of processing *** is observed that when the processing effi-ciency is about 22%,the dislocation density is reasonably *** flow instability region occurs at strain rate of 10.00 s^(-1)with cracks,which should be avoided during hot processing to obtain the required mechanical properties.

关键词： Hot deformation Processing map Ti–15Al–12Nb

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：