大型油船货油装卸仿真模拟装置的开发   总被引：1，自引：0，他引：1  

曾向明詹玉龙  张道兵 《上海海事大学学报》2006,27(1):5-8

运用计算机仿真技术和V isual C 软件设计工具,开发研制基于大型油船货油装卸系统的仿真模拟装置,以供教学与船员培训之用.探讨大型油船货油装卸仿真模拟装置的应用,介绍系统的结构以及软件的实现方法.  相似文献   

汶川大地震中的《华西口腔医学杂志》   总被引：3，自引：3，他引：0  

汤亚玲  梁新华  王晴 《编辑学报》2008,20(5):377-378

结合<华西口腔医学杂志>参加四川汶川大地震抗震救灾工作经历,从口腔医学编辑角度,分析口腔医学编辑在抗震救灾医疗和宣传战线上的作用,以增强医学学术期刊的社会责任感.  相似文献   

建筑抗震概念设计     

王蕊  王樾 《金陵科技学院学报(社会科学版)》2003,18(1):58-60

本文从建筑的平立面布置、抗震结构体系、结构构件和非结构构件设计等方面阐述了建筑抗震概念设计的一般原则和规律  相似文献   

The influence of shoe drop on the kinematics and kinetics of children tennis players     

Alexis Herbaut  Pascale Chavet  Maxime Roux  Nils Guéguen  Christophe Gillet  Franck Barbier 《European Journal of Sport Science》2016,16(8):1121-1129

This study investigated the immediate effects of reducing the shoe drop (i.e. the difference between the heel and the forefoot height) on the kinematics and kinetics of the lower extremities of children tennis players performing a tennis-specific movement. Thirteen children tennis players performed a series of simulated open stance forehands wearing 3 pairs of shoes differing only in the drop: 0 (D0), 6 (D6) and the control condition of 12?mm (D12). Two embedded forceplates and a motion capture system were used to analyse the ground reaction forces and ankle and knee joint angles and moments of the leading lower limb. In D6 compared with D12, the peak impact force was reduced by 24% (p?=?.004) and the ankle was less dorsiflexed at foot strike (p?=?.037). In D0 compared with D12, the peak impact force was reduced by 17% (p?=?.049), the ankle was less dorsiflexed at foot strike (p?=?.045) and the knee was more flexed at foot strike (p?=?.007). In addition, 4 out of 13 participants (31%) presented a forefoot strike pattern for some of the trials in D0. No difference was observed across shoe conditions for the peak knee extensor moment (p?=?.658) or the peak ankle plantarflexor moment (p?=?.071). The results provide preliminary data supporting the hypothesis that for children tennis players, using a 6-mm lower shoe drop might reduce heel impact forces and thus limit potentially impact-related injuries.  相似文献   

Effects of load mass carried in a backpack upon respiratory muscle fatigue     

Mark Faghy  Sam Blacker  Peter I. Brown 《European Journal of Sport Science》2016,16(8):1032-1038

Purpose: The purpose of this study was to investigate whether loads carried in a backpack, with a load mass ranging from 0 to 20?kg, causes respiratory muscle fatigue. Methods: Eight males performed four randomised load carriage (LC) trials comprising 60?min walking at 6.5?km?h^?1 wearing a backpack of either 0 (LC₀), 10 (LC₁₀), 15 (LC₁₅) or 20?kg (LC₂₀). Inspiratory (P_Imax) and expiratory (P_Emax) mouth pressures were assessed prior to and immediately following each trial. Pulmonary gas exchange, heart rate (HR), blood lactate and glucose concentration and perceptual responses were recorded during the first and final 60?s of each trial. Results: Group mean P_Imax and P_Emax were unchanged following 60-min load carriage in all conditions (p?>?.05). There was an increase over time in pulmonary gas exchange, HR and perceptions of effort relative to baseline measures during each trial (p?p?>?.05). Conclusions: These findings indicate that sub-maximal walking with no load or carrying 10, 15 or 20?kg in a backpack for up to 60?min does not cause respiratory muscle fatigue despite causing an increase in physiological, metabolic and perceptual parameters.  相似文献   

多载波系统中低复杂度的改进比特和功率分配算法     

许威  赵春明 《东南大学学报》2007,23(1):12-15

基于迭代的比特和功率分配机制,提出了一种低复杂度的比特和功率分配算法.与传统的迭代分配算法不同,该算法在每次迭代中只需要比较几个特定的子载波.该方法在保持传统迭代算法性能的前提下极大地减小了迭代分配算法的复杂度.此外,通过选择等功率分配方案作为初始方案加快了算法的收敛速度,进一步降低了算法复杂度.仿真结果表明,提出的改进算法在基本不牺牲系统性能的前提下有效地降低了算法复杂度.  相似文献   

高压注浆技术对大直径超长嵌岩桩影响性状研究     

黄建华  陈忠  李峰 《福建工程学院学报》2003,1(3):22-28

硬质岩持力层埋藏较深的地区，大直径超长灌注桩在嵌入相对较浅的软质(破碎)岩后，再进行后压浆处理，可以明显提高承载力并减少沉降量。文章通过工程实例测试了在同一个工程场地上两种不同施工工艺的两组试验桩，对其测试数据和试验资料进行分析研究，优化设计方案，缩短工期，节省造价，并得到一些有价值的结论，避免今后类似工程盲目增加桩长、加大嵌入硬质岩深度而造成的工程经济损失。  相似文献   

动静载荷耦合作用下岩石破坏过程研究现状     

左宇军  杨菊英 《大连大学学报》2007,28(6):52-57

动静载荷耦合作用下岩石破坏过程研究是深部开采等相关岩土工程的应用基础性研究课题.本文对动静载荷耦合作用下岩石破坏过程研究现状进行了分析,并对该领域今后的研究方向进行了探讨.  相似文献   

公路隧道洞口段地震动力分析     

周和庆 《南阳师范学院学报》2007,6(12):65-68

根据以往的受震破坏经验,在公路隧道的高烈度地震带,地下工程可能会遭受严重震害,尤其洞口段为抗震薄弱区,本文采用FLAC3D软件,从土—结构相互作用模型出发,运用数值分析方法对隧道洞口段进行了三维弹性和弹塑性分析,得出了相应结论,并对结果进行分析,指出隧道抗减震设计中应注意的事项,并提出相应解决措施。  相似文献   

多层砖混房屋抗震性能分析     

贠英伟  张广峻  刘丹 《邢台职业技术学院学报》2006,23(1):43-44

本文通过对多层砖混结构的震害进行分析,并根据砖混房屋结构特点,结合自身设计经验,提出在砖混房屋抗震设计中应注意的几个问题及采取的相应措施,对多层砌体房屋的抗震设计具有重要的指导意义。  相似文献