压下

This paper measured the constitutive relation of soil in the condition of the low stain-rate by Split Hopkinson Press Bar technology. It offers the reference for study in high stain-rate in the future. And simulated the explosion between soil and concrete by finite element dynamic analysis software LS-DYNA3D. Finished the numerical simulation for power of exploding between soil and concrete in different position of detonator and different scale model. Set out the curves of displacement, velocity, acceleration and pressure of different position. Obtained the destructibility of concrete target in different explosion condition. It offers data reference for theory studying and engineering designing.

本文首先利用分离式Hopkinson压杆实验技术测定了土在低应变率下的本构关系，为以后进行较高应变率下的研究提供了参考；后面着重利用三维显式非线性有限元动力分析软件LS-DYNA3D对土壤混凝土介质中的爆炸进行了数值模拟，采用土壤混凝土分层介质模型，完成了不同装药位置、不同缩比模型的混凝土模型中爆炸威力的数值模拟，测定了不同情况下的压力曲线及典型位置的质点位移、速度、加速度和压力，得出了混凝土靶在各种不同爆炸条件下的破坏情况，为理论研究和工程设计提供了数据参考。

In the existing buckling analysis of drill stem in horizontal condition,the drill stem is thought of as an even rod with equal diameter and sticked on the below wall of well on the action of deadweight,so it was simplified as simply supported beam compressed axially and supported evenly along its length by well wall.

在现有的水平状态下钻柱屈曲研究中，一般把钻柱看作均匀的等直径杆，认为钻柱在其自重的作用下，紧贴下井壁，因而通常把水平状态下的钻柱简化为在整个长度上受到井壁均匀支承的轴向受压的简支梁。

The experimental investigation demonstratesthat (1) the critical perforation energy of pressure pipelines (D/H=15) with pressure OMPa under lateral impact of flat-nose and spherical-nose indenters ranges from 2~3%,the critical perforation energy of empty pipelines is higher 1 ~2% than pipelines filled in water without pressure.

实验研究结果表明：(1)当管梁内注满水，预加工作内压P=0MPa时，对于径厚比D／H=15的厚壁圆管，在平头弹体和球形弹体两种弹体冲击作用下临界穿透破坏能量的降幅在2～3％之间：锥头弹体冲击厚壁空管的临界穿透能量比充水预加内压为P=0MPa的圆管高1～2％：(2)充水管道的预加内压提高，临界穿透能量有一定降低。

It introduces the target and aim of prestressing test,elaborates prestressing crafts of large bridge building machine,brings forward how to simulate prestressing pile on large bridge building machine in big bulk,so as to ensure the safety of construction and feasibility of the plan under inspection state.

介绍了预压试验的对象及其目的，简要叙述了造桥机在施工中的预压工艺，提出了如何在造桥机上进行大吨位预应力箱梁模拟预压的方法，从而保证检验施工状态下造桥机的施工安全及方案的可行性。

It's optimum to set it at the location around the third insulator from the conductor side. According to the experiments, the corona discharge often happens around the groove between the ball pin and the porcelain shell.

均压环可以有效的改善导线侧绝缘子的分布电压，经过对均压环的优化计算表明，在能保证放电间隙有足够闪络距离的条件下，均压环装在靠近导线侧第3片绝缘子上下的位置最佳。

The overpressure transients of the most penalizing category 2 condition and category 3 condition are simulated by the thermal-hydraulic code-CATIA 2, and the reactor coolant system overpressure protection under the stretch-out operation for LING AO NNP is validated.

本文阐述岭澳核电站延伸运行工况下反应堆冷却剂系统超压保护分析的原理和方法，利用热工水力程序CATIA2对最为严重的二类工况和三类工况超压瞬变做了分析和计算，计算表明岭澳核电站延伸运行期间冷却剂系统超压保护是有效的。

The autoclave is for 4-10 hours at a constant temperature of 175-210 DEG C and under the vapor pressure of 1.0-1.3 Mpa; steam curing is to steam cure 24-48 hours at a constant temperature of 70-100 DEG C.

蒸压是在175～210℃恒温蒸压4～10小时，蒸汽压为1.0～1.3Mpa；蒸养是在70～100℃恒温下蒸养24～48小时。

It is indicated that only a single resonance peak appears in the amplitude versus frequency curve without spurious resonance peaks during the procedure. The direct actuation enables to improve the tuning accuracy, weaken the possible sample damage by the tip, and enhance the atomic force microscope bandwidth and imaging rate.

研究表明，采用压电探针的直接激振方法在探针振动的幅频曲线中仅有单一谐振峰，可以避免在压电陶瓷管激振方法下由液体振动造成的寄生谐振峰，因此使用压电探针不仅提高了探针振动频率的控制精度，而且减小了针尖对样品的损坏，还提高了仪器的带宽和成像速度。

Was founded in 1998, the main distribution line agents and flake-like electronic components, has Huake, thick sound, YAGEO resistance, Howard Branch, YAGEO, Samsung, TDK's capacitor, the United States AVX and KEMET, Japan NEC tantalum capacitor, NEC, PHILIPS, MOTOROLA, long electric brand b / triode, ST and ROHM's regulator tube, TOREX, Pui Ling, Li Qi, Jing-fu, Taiwan's power supply LDO regulator IC, DC / DC step-up IC, DC / DC step-down IC, TDK, too enticed, Fenghua inductor, bead, Panasonic adjustable capacitance, an adjustable resistor, three-ying Korea and Japan's Sanyo electrolytic capacitors, and insurance management, light-emitting diodes, thermistors, varistors, the brand of integrated circuits and so on; are a professional supporting electronic components for over many years of experience supporting services.

深圳金星电子科技有限公司成立于1998年，主要代理经销直插式和片状式的电子元器件，有华科、厚声、YAGEO的电阻，华科、YAGEO、三星、TDK的电容，美国AVX和KEMET、日本NEC的钽电容， NEC 、PHILIPS、MOTOROLA、长电品牌的二/三极管，ST和ROHM的稳压管，TOREX、贝岭、立奇、富晶、台湾的LDO电源稳压IC、DC/DC升压IC，DC/DC降压IC，TDK、太诱、风华的电感、磁珠，松下的可调电容、可调电阻，韩国三莹和日本三洋的电解电容，及保险管、发光二极管、热敏电阻、压敏电阻、各国品牌集成电路等等；是一家专业的电子元器件配套商，已有多年的配套服务经验。

It is widely concerned in fatigue of concrete structures. In this paper, concrete triaxial compression fatigue experiments and tension-compression fatigue experiments with constant confinements in two lateral directions have been carried out using a self-modified loading apparatus. Based on the analysis of the test data, the quantitative principles of concrete fatigue deformation and the calculation method of fatigue strength are determined.

混凝土结构的疲劳是一个广为关注的问题，本文针对这一问题结合国家自然科学基金项目——混凝土多轴变幅疲劳破坏准则(50078010)的研究，利用自制的试验加载装置完成了两向定侧压约束下混凝土三轴受压、三轴拉-压等幅和变幅疲劳试验，对试验结果进行了分析。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。