铁路新型快餐盒产品质量分析

为保证入路供货的新型快餐盒的产品质量，铁道部安全卫生检验站对３种新型快餐盒进行了安全卫生、使用性能及环保性能检验，通过对检验数据的统计分析，提出了３种新型快餐盒的现状及存在问题。     

大跨度悬索桥施工猫道抗风稳定性分析

为了保证大跨度悬索桥施工猫道的抗风安全,通过风洞试验对悬索桥施工猫道进行了动力特性和抗风稳定性分析,结果表明,虽然没有采取设置抗风索的措施来提高猫道的抗风稳定性,但仍然具有良好的抗风稳定能力。     

复合材料连铸连挤工艺参数的研究

本文对钢丝增强铝复合材料连铸连挤的工艺参数进行了试验研究。分析了旋转轮转速、浇注温度、流量、间隙等参数列工艺过程及产品性能的影响,给出了最佳工艺参数。     

计算机辅助设计在建筑装饰装修施工中的应用

科技突飞猛进的发展,对工程技术人员的知识结构提出了更高的要求,如何运用计算机等高新科技提高工作效率,这是工程项目竞争中关注的焦点之一。本文介绍了建筑装饰装修工程施工的特点,重点介绍了运用计算机辅助设计根据施工现场进行的二次设计在建筑装饰施工中的应用。     

充血性心衰患者血清铜锌锰含量变化

本研究对43例慢性心衰病人测定了血清铜、锌及锰含量。与健康对照者相比心衰病人血清铜含量显著增高;锌含量低;铜/锌比值增大。     

Bond Graphs for Vehicle Dynamics

For the purposes of analyzing the stability and control properties of aircraft, automobiles, and ships, it is convenient to idealize the vehicle as a rigid body and to use a body-centered coordinate frame. A six-port bond graph is first developed which represents the nonlinear dynamics of a rigid body in a coordinate system rotating with the body. It is then shown how the graph simplifies if only lateral or longitudinal dynamics are studied. Finally, bond graphs for the type of stability studies in which the assumption of small perturbations permits linearization are shown for elementary models of automobiles and aircraft.     

轻轨车辆专家系统的开发

本文根据专家系统的理论和方法,开发了轻轨车辆专家系统。此系统可以为用户提供有关轻轨车辆的最佳参数,运量及牵引计算结果,为轻轨车辆的选型提供依据。     

强相互作用的动力学自相似性与Dirac强子Bose强子的比较研究

质子枚举产生的几率分布与π介子的分布具有相同的标度形状。这个实验事实可用量子场反常维度的差别来解释。γ_B(g_R)=-(0.045±0.015),γ_F(g_r)=-(0.40±0.08)。实验同时揭示出喷注(q+q)→重强子→轻强子这个强衰变过程的动力学自相似性。     

VON HIPPEL LINDAU DISEASE(附4例报告)

Von Hippel Lindau disease(VHL病)为临床罕见的常染色体显性遗传病,以引起视网膜、中枢神经系统及其他器官的血管瘤为主要表现。本文报告一家族两代4人患VHL病之病案,所有之病例均经萤光眼底血管造影检查及开颅手术探查、病理检查确诊为VHL病。笔者结合临床病案,复习文献,对VHL病的临床表现、诊断、治疗及预后进行讨论。     

Power Requirements for Traversing Uneven Roadways

Vehicles which travel on uneven roadways or rough surfaces require power beyond that associated with air drag, rolling resistance or other sources of friction even though kinetic and potential energy may be conserved on the average. This is true because damped relative motions within the vehicle dissipate energy, and, even for nearly rigid vehicles, energy is lost at impact with the ground whenever the vehicle loses contact with the ground surface due to the finite downward acceleration of gravity.

Using elementary vehicle models, the nature and magnitude of the component of propulsive force associated with these energy loss mechanisms is estimated. In certain speed ranges, this force is found to vary dramatically with speed for several types of periodic roadway profiles studied. While the force due to unevennesss may be small compared to other forces for high-speed vehicles operating on smooth surfaces, it can be the major source of required power for off-road vehicles operating on very rough terrain.