摩托车燃油蒸发污染物排放测试浅析（1）

要保证燃油蒸发测试的准确性，首先应确保车辆状态的稳定，包括炭罐的老化、炭罐正常的吸附、脱附，及油气管路的正确连接等。对燃油蒸发测试结果影响最大的因素是油品和试验用油的蒸气压，只有在试验用油和燃油蒸气压一致的条件下，各种测试结果才有可比性。因此，日后在进行燃油蒸发试验时应重点关注燃油的蒸气压。     

One manufacturer's approach to improving jet transport fuel efficiency

In the face of rapidly escalating costs of aircraft fuel, since the early 1970s, the aerospace industry has embarked on a program of measures to reduce fuel consumption. This article describes an integrated set of measures which have been undertaken by Lockheed‐California to improve the fuel requirements of the Tristar, a wide‐bodied three engine medium to long range aircraft. Measures include operational changes, improvements to maintenance practices, long term hardware modifications and technological advances.     

On stress concentration factors for tubular Y- and T-Joints in frame structures

This paper is written as a result of some years experience with fatigue analysis of offshore jacket structures where the connections are made as tubular joints. The hot spot stresses at the tubular joints in such analysis are normally derived based on parametric equations for stress concentration factors. These stress concentration factors are normally related to the axial force in the brace. It is observed that the hot spot stresses at the crown positions of the tubular joint in some cases are significantly affected by the local loading on the chord and the bending moment in the chord. In order to use the existing formulae in these cases some engineering effort is required to derive correct hot spot stress. This work can be avoided by using the nominal stress in the chord as the basis for calculating the hot spot stress at the crown position instead of using the axial force in the brace as basis for the analysis. This also extends the validity of the equations for stress concentration factors for T- and Y- joints in design standards. The proposed modification makes it also simpler to include the effect of joint flexibility in a proper way. The basis for a proposed revision of the equations for stress concentration factors for these joints is presented in this paper. It is considered that this modification leads to minor changes of the computer code, but that it will save analysis work for engineers and reduce the possibility of calculating incorrect fatigue lives in tubular frame structures.     

高速公路隧道交通安全评估研究

主要介绍了高速公路隧道交通安全评估的理论与方法。隧道交通安全评估主要分为两个方面:一是安全风险评估,二是安全潜力评估。通过对高速公路隧道交通事故进行分析,得出影响隧道交通安全的风险因素,并针对各风险因素,找出可减少事故发生概率和减轻事故严重程度的安全保障措施。根据各种不同情况下所产生的风险因素及相应的安全保障措施,分别给出了安全风险参数和安全潜力参数的评分标准,及隧道安全评估参数的计算方法。最后应用模糊评价的方法,代入隧道安全评估参数,对隧道的交通安全状况进行评价。     

乌鲁木齐低液限粉性土击实试验影响因素分析

通过乌鲁木齐低液限粉性土的击实试验研究,阐述了土样制备方法及含水量和击实功对干密度的影响,建议按具体情况确定经济击实功。讨论了击实筒余土高度的变化对击实试验结果的影响,并提出击实过程中最后一层土按余土高度为4 mm估算,通过修正余土高度的影响,减小试验误差。     

辽东湾葵花岛构造区海洋工程地质条件分析

通过对水深、浅地层剖面、侧扫声纳和海底钻探取样等实测资料的详细分析, 揭示了辽东湾葵花岛构造区的自然地质状况和复杂的海洋工程地质环境特征。该海区海底地形地貌虽然较为简单,但沉积物为近代沉积的饱和海相、陆相沉积物,具有含水率高、液化指数高、承载力偏低等特点,并存在海底冲刷深槽、埋藏古河道、浅层气等潜在灾害地质因素,对海上构筑物存在直接或潜在的危险性,应引起高度重视。     

长江下游口岸直水道通航风险分析与安全评价

针对拟实施的航道整治工程,基于口岸直水道实际情况,对照航道通航环境影响因子的危险度评价标准,选取各影响因子作为评价指标,分析其对口岸直水道的通航安全的影响并进行风险评价,得到相应的风险级别。     

居民轨道选择意向建模与应用研究

基于轨道交通大发展的背景,对居民选择轨道交通出行的意向进行建模分析,旨在为大城市的轨道交通建设提供依据。通过分析居民出行交通方式选择的影响因素（传统的出行方式、出行费用、性别等）,构建了居民轨道选择意向转移模型,并确定模型的输入输出向量,利用MATLAB-ANN的BP网络,求解模型效用值,最后结合苏州市进行应用研究。     

我国中小板上市公司高管薪酬影响因素的实证研究

中小板上市公司自2004年6月份在深交所推出以来,一直都是市场关注的焦点.选取2008年中小板上市公司相关数据作为样本,从高管个人特征、组织特征和环境特征三方面考察了中小板上市公司高管薪酬的影响因素.研究结果表明,高管年龄和学历、公司业绩和规模以及地区因素对中小板上市公司高管薪酬产生了显著的影响,而高管任期以及公司治理...     

整体式连拱隧道渗漏水影响因素研究

连拱隧道由于其在整体线形等方面的优势,在工程中已得到广泛应用,但在已建整体式连拱隧道中均存在不同程度的渗漏水现象,故探究整体式连拱隧道渗漏水影响因素可为其渗漏水治理及创新发展等方面提供依据.以某整体式连拱隧道渗漏水病害为例,通过实地调查隧道渗漏水现状,具体分析隧道渗漏水原因,并结合层次分析法分析各影响因素的主次关系.结...