喷油定时对柴油机经济性和排放的影响

燃油喷射系统是柴油机的重要组成部分,燃油系统喷油定时对柴油机的性能、烟度、排放和噪声起着至关重要的影响。根据不同的喷油定时对柴油机的油耗和排放的影响,分析如何选择喷油定时使柴油机获得良好的性能。     

基于虚拟仪器的柴油机实验台测试系统设计

先进的柴油机测试系统对提高柴油机运行管理水平和柴油机测试实验教学具有重要意义。利用虚拟仪器技术开发了柴油机综合测试实验系统,介绍了系统的总体结构及硬件系统,以"性能指标测量分析"实验为例给出了实验系统的软件实现方法。实现了柴油机各种测量参数的实时显示和综合性能指标、参数曲线的自动分析处理,提高了实验教学效率,取得良好的教学效果。     

液压挖掘机电子监控节能系统的研究设计

系统主要基于对柴油机和液压系统的联合控制,达到节能降耗和提高工作效率的目的.通过对柴油机和泵的特性曲线的分析,建立控制模型;通过仿真测试,达到设计要求的控制效果.系统自动拟合液压泵和柴油机的功率曲线、采用CPU单元对柴油机、液压泵进行控制,建立液压挖掘机的智能节能控制系统.     

电控燃油喷射系统的原理及故障分析

简单介绍了柴油机电控技术发展的市场优势和柴油机电控技术在柴油机控油系统的应用.同时阐述了柴油机电控燃油喷射系统的功能与组成、电控燃油喷射系统日常处理故障的方法的探究.     

柴油机、变矩器故障监控系统的研制与应用

为了保障海洋平台柴油机和变矩器运行的可靠性、降低设备故障率,根据海洋平台柴油机和变矩器的运行特点和要求,设计了柴油机和变矩器故障监控系统。该系统通过定向设计的多参数采集模块,完成了柴油机和变矩器转速、压力、液位及温度等信号的采集,同时通过RS485总线将采集的信号传输给上位系统,完成信号数据的处理、储存、分析、显示及远传,为现场柴油机和变速箱的故障监控和运转状况分析提供了信息服务。     

船用柴油机故障诊断系统研究

船用柴油机故障诊断系统可以提高轮机工作人员的管理水平,达到快速分析、准确判断及迅速排除故障。它以船用柴油机典型故障为基础,应用Visual FoxPro数据库管理系统建立船用柴油机故障诊断系统。通过柴油机拉缸故障典型实例来具体说明该系统的使用方法和特点。该系统具有可修改、插入和删除等功能,以友好的用户界面和易于操作等特点,实现船用柴油机典型故障的快速诊断。该文的创新点是将船员具有的故障处理的经验及知识作为专家系统,供其他船员的学习,以便准确、快速地处理柴油机的故障。     

4JB1柴油机高压喷射系统选型及管路匹配

采用FSEM(fuel system evaluation method)的方法进行柴油机高压喷射系统选型,针对4JB1柴油机选择BOSCH公司的第2代共轨系统.利用AMESim建立高压共轨柴油机供油系统模型,包括高压供油泵子模型、压力调节阀子模型、喷油器子模型和连接它们的高压油管子模型.仿真研究共轨管容积、高压油管长度和内径等参数对共轨管中的压力建立和压力波动的影响,并针对4JB1共轨柴油机进行共轨系统管路参数选择和试验验证,结果表明匹配的管路系统满足共轨柴油机轨压快响应和小波动的要求.     

一种柴油机燃烧过程的可视化实验装置

文章介绍了一种基于高速摄影技术的柴油机燃烧过程的可视化实验装置,它主要由进气系统、光学发动机系统、高速摄影系统和数据采集系统等组成.该装置为视窗上置式结构,具有结构简单、对产品柴油机改动小等优点,利用本装置可实现对柴油机的着火和燃烧过程进行可视化分析,在改善柴油机燃烧过程和排放特性方面具有重要意义.     

柴油机可变预行程泵电控系统的匹配标定

柴油机电控系统的匹配、标定研究对电控系统的应用具有重要意义。介绍了进行柴油机电控系统标定的方法。获取了供油量和供油提前角脉谱 ,使 6 110型柴油机的性能总体上得到了改善。可变预行程泵电控系统具有结构简单 ,对原机改动小 ,实用性强的特点 ,研究表明可变预行程泵电控系统有较好的综合性能 ,应用它可为直喷式柴油机性能的改善提供潜力     

DF11型机车燃油喷射系统存在主要问题分析

机车柴油机燃油喷射系统的优劣直接影响着机车柴油机工作的可靠性,直接关系到能否通过进一步提高喷射压力从而提高燃油的雾化质量的可能性,进而影响到柴油机整体性能的改善和可靠性的提高。本文通过分析柴油机燃油系统的三个精密偶件,阐述了DF11型机车柴油机燃油喷射系统存在的主要问题。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with