环形交叉口的信号控制方法研究

基于信号2次控制模式的基本原理,对十字环形交叉口左转2次控制方法在交通设施布置和相位协调设计等方面进行改进,使其可用于多叉、中心环岛不规则等复杂环形交叉口的信号控制,并通过实例加以验证。其中,在环道相位之间通过绿灯间隔时间进行协调设计,可以使车辆连续通过相邻环道信号灯,减少车辆在环道上停车待行的次数,从而提高交叉口通行效率。     

轻型客车偏置碰撞安全性改进设计的台车方法

为了提高某轻型客车的偏置碰撞安全性,在外形保持不变以尽可能节约成本的前提下对车身进行改进。根据轻型客车大多采用半承载式车身,车架是主要的吸能部件的特点,把车架作为重点改进对象,采用台车试验和台车模拟相结合的方法,提高其正面偏置碰撞安全性能。     

Prospective randomized trial of surgery combined with preoperative and postoperative radiotherapy for rectal carcinoma

Objective To assess the effect of surgery combined with preoperative and postoperative radiotherapy ("sandwich" treatment) in rectal carcinoma. Methods From October 1990 to January 2002, 260 patients with stage Ⅱ (117 patients) and stage Ⅲ (143 patients) rectal carcinoma were randomly divided into three groups: "sandwich" group (92 patients, group A), postoperative radiotherapy group (98 patients, Group B) and operation group (70 patients, Group C). The preoperative accelerated hyperfractionation (15 Gy/6f/3d) was given for "sandwich" group which was followed by conventional postoperative fractionation (DT 35 - 40 Gy/3.5 - 4 weeks). Patients in Group B were given postoperative radiotherapy (Dr 50 Gy/5 weeks). Patients treated with surgery alone served as control. Results The local recurrence rates of Group A, B and C were 5.4% (5/92), 16.3% (16/98) and 64.3% (45/70), respectively (X2 =5.726, P=0.017); and the distant metastasis rates were 6.5% (6/92), 28. 6%(28/98) and 31.4%(22/70), respectively (X2 =15. 703, P= 0. 001). The 3-ycar survival rate was 86. 9%(80/92), 62.2%(61/98) and 51.4%(36/70), respectively (X2 =15. 141, P=0. 001). The 5-year survival rate was 68. 5%(63/92), 54.1%(54/98)and 41.4%(29/70), respectively (X2 =4. 218, P=0.04). The Ⅰ and Ⅱ grades of radiation entero-colitis in Group A and Group B were 7.6% (7/92) and 6.1% (6/98), respectively (X2 = 0. 164, P= 0. 685). Conclusion Surgery combined with preoperative and postoperative radiotherapy can improve the survival rate and reduce the local recurrence rate in rectal carcinoma patients with stage Duke's B (Ⅱ) and C (Ⅲ).     

基于虚拟仪器的船舶电机测试与监测系统

以虚拟仪器技术构建了电机测试与监测系统平台,给出相关的硬件实现和软件设计流程,实现了多路电压与电流的数据采集、数据管理, 并根据相关理论和所测得电压和电流信号的相关参数计算出电机的输入功率、功率因数等其他物理量,实现了实时数据监测.试验结果表明,测试效果良好,验证了测试与监测系统的可行性和有效性.     

船舶柴油机气缸内径测量数字仪表的研制

从柴油机气缸套的重要性出发,分析了造成气缸套磨损的各种主要形式.在阐述传统气缸套测量方式缺点的基础上提出了具有较大意义的数字式测量方式,同时给出了相关的设计电路,并进行了系统优化讨论.     

连续梁桥基于预应力度配束方案的模糊优化决策

建立预应力混凝土连续桥预应力度的模糊优化问题,按α－水平截集解法,将模糊优化问题转化为确定性的数学规划问题。求得一较合理的消压弯矩后,只需按控制截面的构造进行预应力体系设计。在基础上提出了配束自动化的基本思想,并以一实例说明其理论应用。     

城市轨道交通刚性接触网

结合广州地铁2号线的运用,介绍刚性接触网的主要特点;对刚、柔接触悬挂的各项指数进行对比,说明刚性接触悬挂的优越性。     

高速公路项目工程投资的控制与管理

结合长常高速公路及常张高速公路建设工作实践,从建设单位的角度对高速公路工程各阶段的投资控制与管理进行了分析。     

内河船舶驾驶仿真系统的环境模拟

为了提高内河船舶驾驶仿真系统的真实性,提出并介绍了体感、声音、振动和自然风等环境模拟方法,能实时模拟船舶操纵中各种环境状态,使操纵者身临其境。