“船舶管系放样与生产”课程建设与实践

《船舶管系放样与生产》是轮机工程技术专业的核心课程,主要面向船舶管系放样设计及生产管理岗位。课程组按照省级精品课程建设标准进行课程建设,对课程进行改革、创新,构建出以任务引领型的项目为导向的教学模式。     

Normal reference value of forced vital capacity of Chinese younger women and geographical factors

Objective To supply a scientific basis for standardizing the normal reference value of forced vital capacity (FVC) of Chinese younger women. Methods We studied the relationship between the normal reference value of 21767 samples of FVC of younger women and eight geographical factors in 157 areas in China. Results It was found that the correlation between geographical factors and the normal reference value of FVC of younger women was quite significant (F=5.884, P=0.000). By adopting the method of mathematical regression analysis, one regression equation was inferred: =3.146+0.00006919X1+0.01315X4-0.006966X6+0.09524X8±0.254. In the above equation, is the normal reference value of younger women' FVC (L); X1 is the altitude (m); X4 is the annual mean air temperature (℃); X6 is the annual mean relative humidity (%); X8 is the annual mean wind speed (m/s); 0.254 is the value of the residual standard deviation. Conclusion If geographical values are obtained in a certain area, the normal reference value of FVC of younger women in this area can be obtained by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, middle and lower reaches of the Yangzte River Region, Southeast China Region, Northwest China Region, Southwest China Region, and Qinghai-Tibet Plateau Region.     

登陆舰艇作战能力评估研究

针对登陆舰艇作战能力评估的特殊性和复杂性,采用决策理论中效用函数与多目标决策方法相结合的方法,构建了登陆舰艇作战能力评估模型,对国内外典型登陆舰艇的作战能力进行了评估,评估结果可以为对登陆舰艇研制方案的论证及其作战使用方法研究提供借鉴和参考。     

基于类间距优化的分心驾驶行为识别模型训练方法

分心驾驶行为识别任务可以看作细粒度图像分类任务,即图像中较小区域所包含的特征决定了该图像的类别,如一张图像是正常驾驶还是与副驾驶聊天完全由驾驶员的脸部朝向来决定.对于那些图像差异很小的类别,图像分类通常训练方法训练出的模型无法高精度地区分.针对这一问题,提出了基于类间距优化的分心驾驶行为识别模型训练方法,通过增大模型从...     

超级电容电动城市客车电磁兼容性能试验研究

分析了超级电容的机理和特点。根据我国对电动车辆在电磁兼容性能(EMC)方面的相关检验要求,对某超级电容城市客车进行了EMC试验,验证了当前国内与电磁兼容相关的准入标准在此类新能源车辆上实施的可行性,了解了目前超级电容城市客车实际的EMC性能。根据试验结果指出,采用现行国家标准对超级电容城市客车进行EMC试验虽然是可行的,但试验应该具备文中所提的前提条件。     

地震效应下二级边坡三维动态稳定性上限分析

为了给二级边坡的抗震设计提供参考,对其在地震力作用下的稳定性进行研究。基于三维破坏模型,采用拟静力法将地震力引入计算模型中,运用极限分析上限定理分析二级边坡破坏时的能量耗散,并根据虚功率原理推导稳定系数的解析解。利用穷举法优化计算,得到约束条件下稳定系数的最优上限解,并与已有研究成果进行对比。利用该方法,分析宽高比、内摩擦角、深度系数、上、下台阶倾角、地震力等因素对二级边坡稳定性的影响。针对不同的计算精度,给出二级边坡可简化为二维平面应变问题的最小宽高比。研究结果表明：该方法正确可靠;宽高比对稳定系数影响显著,随着宽高比的增大,二级边坡的三维效应逐渐弱化,最终转变为二维平面应变问题,内摩擦角、深度系数、上、下台阶倾角对稳定系数有较大影响;对边坡进行放坡时,应尽量减小上、下台阶的倾角,并增大上台阶边坡的高度,以提高二级边坡的稳定性;水平地震力与竖直地震力对二级边坡的稳定性有显著影响,如果计算中不考虑地震力,则稳定系数的相对误差分别高达40%和15%。     

Discretization Algorithm Based on Particle Swarm Optimization and Its Application in Attributes Reduction for Fault Data

In order to increase the fault diagnosis efficiency and make the fault data mining be realized, the decision table containing numerical attributes must be discretized for further calculations. The discernibility matrix-based reduction method depends on whether the numerical attributes can be properly discretized or not. So a discretization algorithm based on particle swarm optimization (PSO) is proposed. Moreover, hybrid weights are adopted in the process of particles evolution. Comparative calculations for certain equipment are completed to demonstrate the effectiveness of the proposed algorithm. The results indicate that the proposed algorithm has better performance than other popular algorithms such as class-attribute interdependence maximization (CAIM) discretization method and entropy-based discretization method.     

210吨浮吊巧吊505吨沉箱工艺分析

介绍了在港口工程施工中,利用海水的浮力以及一些辅助工艺,用210吨浮吊成功起吊安装505吨重的沉箱。这种借助水的浮力来减轻起重量的起重工艺,大大提高了工程施工的进度和质量。     

第6届国际机车车辆转向架大会综述

介绍了第6届国际机车车辆转向架大会概况及世界各国转向架技术发展的最新成果,着重介绍轮轨接触与磨耗、机车车辆系统仿真、强度及可靠性、高速及重载技术、径向转向架、悬挂及制动系统等最新研究成果。     

《中国航海》1994-2005年论文及作者的统计分析

运用数理统计和文献计量学方法,对《中国航海》在1994-2005年间所刊载的论文内容和作者分布等作为统计内容,进行了定量分析与评价。目的在于更好地为学科的科研和队伍发展服务,并为广大航海科学研究者提供有益的参考。