毫秒延期电雷管延期精度影响因素的显微分析

通过一种新的方法——高速摄影和显微观察来分析影响雷管延期精度的因素,通过药头、延期体燃烧摄影照片以及延期体燃烧后剖面显微观察对比,对影响延期精度的主要因素做了重点分析,而且该试验为进一步研究延期精度提出了新的方法。     

“铁丝在氧气中燃烧的探究” 实验教学设计

围绕铁丝在氧气中燃烧的影响因素设计探究实验,重点探究氧气浓度、接触面积对铁燃烧的影响,同时探究铁丝燃烧过程中产生火星四射现象与铁丝中含碳量的关系。     

心理尺度对大学生学习积极性的影响

大学生学习积极性受内在因素和外在因素的综合影响。外在因素中包括不同心理尺度的因素。通过设计问卷,调查不同心理尺度对大学生学习积极性的影响。结果表明:小环境对大学生学习积极性影响较大(F=10.481,df=3,P<0.05),尤其是寝室的学习风气。学校学生管理和教学管理部门以小尺度单位为管理重点,有助于提高大学生学习积极性。     

定容燃烧模拟装置的研制

发动机工作过程的研究不仅是车辆的研究重点方向之一,而且也是热能动力机械行业的研究重点之一.定容燃烧模拟器可以实现对发动机的定容加热燃烧过程的研究.文章就所研究的定容燃烧模拟装置的结构组成、功能和工作原理进行了论述,该结构主要由气源、定容燃烧弹体、燃料/空气混合器、混合气配给系、点火系、控制系统和数据采集等系统组成.可以实现对定容燃烧过程边界条件精确控制,剔除点燃式发动机定容加热过程中众多杂乱影响因素,从而清晰地反映出燃烧过程及其影响因素的作用.     

心理尺度对大学生学习积极性的影响探讨

大学生的学习积极性往往会受内在因素以及外在因素的影响。其中,外在因素包括社会因素、校园文化环境、家庭因素以及生活学习环境等,此外,心理尺度亦属于外在因素,内在因素则包含大学生思想观念、内在心理以及个人行为等因素。大学生所具备的不同心理尺度,对大学生的学习积极性亦存在一定影响。本文通过调查问卷的形式,对大学生不同心理尺度对学习积极性的影响程度进行调查、研究。此次调查结果表明:环境因素对学生学习积极性有着重要影响,其中尤以学生寝室的学习环境为最。因此,通过加强对小尺度的管理,对提高学生学习积极性有着积极作用。     

基于粗糙集与PSO-SVM的二甲醚催化燃烧预测模型

影响二甲醚催化燃烧的因素较多,并且影响因素之间又相互作用,将支持向量机引入二甲醚预测领域.为了克服LS-SVM的局限性,提出将粗糙集理论、粒子群优化算法以及SVM算法相结合,对LS-SVM的惩罚因子和径向基函数的参数进行优化选取.对二甲醚催化燃烧进行了实例研究.结果表明,所提出的模型提高了网络的预测精度,验证了该模型的有效性.     

论建筑工程性能化防火设计中火灾危险性评估的主要因素

围绕建筑工程性能化防火设计中火灾危险性评估的理论依据,详细介绍了六个方面的建筑物火灾危险性评估因素,即：影响建筑火灾发生几率的因素;影响建筑火灾火场温度的因素;影响建筑火灾燃烧速度的因素;影响建筑火灾蔓延方向的因素;影响建筑火灾烟气量及烟气毒性大小的因素;影响建筑火灾烟气蔓延方向的因素。     

“火”——燃烧的条件及控制——人教版(国标本)九年级化学《燃烧与灭火》教学设计

教学设计:本节课的设计突出了对旧知的复习以及在此基础上获得新知——燃烧的条件和灭火的一般方法,并且希望通过实验的改进,得到影响燃烧的外部因素,同时为下一个课题"燃烧对环境的影     

影响燃烧法合成金刚石薄膜的参数

制备金刚石薄膜的方法很多。本文主要介绍了影响燃烧法合成过程的主要因素及其对膜的质量的影响。研究表明，基板温度、氧／乙炔配比、基板至内焰距离等对合成的影响很大。     

关于火电厂脱硝技术的分析研究

控制氮氧化物排放的主要措施有低氮燃烧与烟气脱硝。在分析低氮燃烧和烟气脱硝的主要技术方法及其各自特点的基础上,重点阐述选择性催化还原方法（SCR）的主要影响因素,并介绍了大唐安阳发电厂脱硝项目的概况。     

Experimental study on premix combustion at isosceles triangle type rate of heat release for squish type combustion chamber

This paper presents a theory on premix fuel combustion at near isoceles triangle type rate of heat release, describes the measures taken for the combustion system, points out its many theoretical advantages, and that it can solve effectively the problems of rough running, fuel consumption and exhaust emission. Two squish lip type combustion chambers are designed to match separately with multiple holes injector and conical spray type injector in order to achieve premix combustion at near isosceles triangle type rate of heat release. Experimental studies on two single cylinder diesel engines showed that premix combustion at isosceles triangle type rate of heat release resulted in longer ignition delay period, larger amount of fuel injected into cylinder during the ignition delay period, lower maximum pressure, better fuel economy, and better exhaust emission.     

EXPERIMENTAL STUDY ON PREMIX COMBUSTION AT ISOSCELES TRIANGLE TYPE RATE OF HEAT RELEASE FOR SQUISH TYPE COMBUSTION CHAMBER

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Mixture preparation and combustion of CNG low-pressure compound direct injection spark-ignited engines

A set of compressed natural gas (CNG) multi-point direct injection system of spark-ignited engines and the corresponding measurement and data acquisition systems were developed in this paper. Based on different injection modes, the mixture formation and combustion of CNG low-pressure direct injection (LPDI) engines were studied under varying factors such as air/ fuel ratio, injection timing. Meanwhile, three-dimensional simulations were adopted to explain the mixture formation mechanisms of CNG low-pressure compound direct injection (LPCDI) mode. On the basis of test results and simulation of the mixture homogeneous degree, the conception of injection window was proposed, and the LPCDI mode was proved to be more beneficial to the mixture concentration stratification formation in cylinder under lean-burning conditions, which resulted in effective combustion and stability.     

Application of neural network in the study of combustion rate of natural gas/diesel dual fuel engine

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Application of neural network in the study of combustion rate of natural gas/diesel dual fuel engine

In order to predict and improve the performance of natural gas/diesel dual fuel engine (DFE), a combustion rate model based on forward neural network was built to study the combustion process of the DFE. The effect of the operating parameters on combustion rate was also studied by means of this model. The study showed that the predicted results were good agreement with the experimental data. It was proved that the developed combustion rate model could be used to successfully predict and optimize the combustion process of dual fuel engine. Project supported by National Lab. for Automotive Engine and Safety, Tsinghua University, China     

TDI Char制备液体燃料方法

首次提出以甲醇超临界流体用于TDI Char 制备消解液体燃料技术。研究了制备实验条件并进行表征。结果表明,反应温度270 ℃?反应时间120 min 条件下,TDI Char 的消解率达95%。氧弹量热仪实验揭示,所得单位液体燃料的燃烧热值较直接燃烧TDI Char 增加了2.3 倍。     

Fuel Burning Rate Model for Stratified Charge Engine

A zero-dimensional single-zone double-curve model is presented to predict fuel burning rate in stratified charge engines, and it is integrated with GT-Power to predict the overall performance of the stratified charge engines. The model consists of two exponential functions for calculating the fuel burning rate in different charge zones. The model factors are determined by a non-linear curve fitting technique, based on the experimental data obtained from 30 cases in middle and low loads. The results show good agreement between the measured and calculated cylinder pressures, and the deviation between calculated and measured cylinder pressures is less than 5%. The zero-dimensional single-zone double-curve model is successful in the combustion modeling for stratified charge engines.     

新形势下成人高等学历教育的出路探讨

成人高等学历教育必须迎接挑战,明确自己的发展方向,除了保持小规模、高质量、特色鲜明的学历补偿教育之外,更应该转变观念,向知识经济下世界成人高等教育发展大方向融合,向高层次的非学历教育、继续教育和大学后教育转化。     

Multidimensional modeling of Dimethyl Ether （DME） spray combustion in DI diesel engine

INTRODUCTION The use of dimethyl ether (DME) as an alterna-tive fuel appears to be a promising approach for si-multaneously minimizing NOx and soot emissionfrom conventional diesel engines. The lowself-ignition temperature of 508 K and the high oxy-gen content of 34.8 percent (mass fraction) are twomajor factors characterizing low soot and unburnedtotal hydrocarbon (THC) emissions. Since the firstintroduction of the concept by Sorenson and Mik-kelsen (19…     

Preliminary experimental study on solid-fuel rocket scramjet combustor

Liquid or gaseous fuel scramjet technology has made great progress, and there has been some research attention to solid-fuel scramjet. A new scramjet configuration using solid fuel as propellant, namely solid-fuel rocket scramjet, is tested experimentally. It consists of two combustors. One is a rocket combustor used as gas generator, and the other is a supersonic combustor used for secondary combustion. The experiment simulates a flight Mach number of 4 at high altitude (stagnation temperature and pressure are 1170 K and 1.16 MPa, respectively), and metalized solid fuel is used as propellant. The results reveal that fuel-rich gas from the gas generator can burn with air in the supersonic combustor. Preliminary evaluation results show that the combustion efficiency of the propellant is about 90%, and the total pressure recovery coefficient in the supersonic combustor is about 0.6. These results indicate that the configuration of solid-fuel rocket scramjet is feasible.