穿过可液化土层的振动沉管灌注桩事故原因分析

通过对长江以南某市一银行办公综合楼穿过可液化粉砂土层的振动沉管灌注桩事故原因分析针对性地提出了若干值得注意的相关问题．     

企业经营管理沙盘模拟的竞技技巧

文章总结了企业经营管理模拟沙盘(以下简称企管沙盘)对抗赛中的竞技技巧。从企业经营过程来讲主要是供应、生产、销售三个阶段,体现在企管沙盘中的相应运作就是打广告、抢订单、开拓市场、提高生产能力、研发新产品。而沙盘模拟中制约一个企业竞争力的主要原因就是资金的筹集和运用;要想有效且充分地运用有限的资金达到在订单的数量、市场开发和生产能力之间的平衡,又保持与竞争对手的相对优势,就必须讲究抢订单、产品组合、市场开发等一系列技巧,从容应对各种环境和对手,从而处于不败之地。     

Numerical Simulation of Shaped Charge Jet Using Multi-Phase SPH Method

Since the jets and detonation gaseous products are separated by sharp interfaces, the traditional smoothed particle hydrodynamics (SPH) method is difficult to avoid the computational instability at interfaces. The multi-phase SPH (MSPH) method was applied to improving the stabil-ity, which smoothes the particle density and makes pressure continuous at interfaces. Numericalexamples of jet forming process were used to test capability of the MSPH method. The results show that the method remains algorithm stability for large density gradient between the jets and gaseous products and has potential application to both the explosion and the jet problems. The effect of initiation ways of the shaped charge was discussed as well.     

Heat Transfer of an Array of Round Impinging Jets with One-Sided Exhaust of the Spent Air

ＨｅａｔＴｒａｎｓｆｅｒｏｆａｎＡｒａｙｏｆＲｏｕｎｄＩｍｐｉｎｇｉｎｇＪｅｔｓｗｉｔｈＯｎｅＳｉｄｅｄＥｘｈａｕｓｔｏｆｔｈｅＳｐｅｎｔＡｉｒＳｏｎｇＹｉｊｕｎ（宋益军）ＣｈｅｎＹｏｎｇｙｕａｎ（程永元）ＣａｉＳｏｎｇ（蔡崧）（Ｔｈｅｒｍｏｅｎｅ...     

Large eddy simulation of a particle-laden turbulent plane jet

Gas-solid two-phase turbulent plane jet is applied to many natural situations and in engineering systems. To predict the particle dispersion in the gas jet is of great importance in industrial applications and in the designing of engineering systems. A large eddy simulation of the two-phase plane jet was conducted to investigate the particle dispersion patterns. The particles with Stokes numbers equal to 0.0028, 0.3, 2.5, 28 (corresponding to particle diameter 1 μm, 10μm, 30μm, 100μm, respectively) inRe=11 300 gas flow were studied. The simulation results of gas phase motion agreed well with previous experimental results. And the simulation results of the solid particles motion showed that particles with different Stokes number have different spatial dispersion; and that particles with intermediate Stokes number have the largest dispersion ratio. Project (No. G19990222) supported by the Special Funds for Major State Basic Research of China     

砼表面喷水泥砂浆防碳化处理技术

针对砼构件防碳化处理加固补强方案分析对比．提出了喷射砂浆是一种行之有效的防碳化处理技术。该技术性能可靠，施工方便，施工不妨生产，工期短，同时适用于老化砼构件的修补。     

活性硫对喷气燃料银片腐蚀影响的研究

考察了硫化氢、元素硫、硫醇、硫醚、多硫化物等单独存在时对喷气燃料银片腐蚀的影响；同时考察了元素硫与其它硫化物以不同浓度混合时对喷气燃料银片腐蚀的影响。试验结果表明，硫化氢、元素硫是导致喷气燃料银片腐蚀不合格的主要原因。当元素硫和硫化氢单独存在时，元素硫的浓度只要大于0．5μg／g硫化氢的浓度只要大于1．5μg/g，喷气燃料银片腐蚀就不合格。当与其它硫化物共存时，其它硫化物只起着协同的作用。     

下喷自吸环流反应器内液相局部流动特性

对下喷自吸环流反应器内气－液两相流和气－液－团三相流体系的液相局部流动特性进行了实验研究．用改进皮托管对液相瞬时速度进行了测量，并借助湍流统计理论对渡相平均速度、液相湍动速度和湍动微尺度等液相局部流动参数进行了统计分析和处理，着重讨论了喷射液体流量和固体粒子加入量分别对喷射有效区和导流筒内管流区液相局部流动参数的影响．     

Research on disturbance properties of suspensions near the injection area of moving jet

The equation of the suspension-gas non-streamwise complex disturbance velocity ratio near the injection area of moving jet was theoretically derived by using a phase-coupled model and stability theory. Then the ratio curves were obtained by the finite difference method based on the asymptotic method and the Euler conservative difference scheme. Analysis of the curves yielded conclusions on the disturbance properties of suspensions and effects of the natures of the flow-field and the properties of the suspensions on the suspensions ability to track the disturbed gas flow are presented in this paper. Projects supported by the State Education Commussion’s Trans-century Training Program Fund for Talents     

Experiments on Deflecting & Oscillating Waterjet

A new type jet, the oscillating & deflecting jet, is put forward and its oscillating and deflecting characteristics are investigated. The nozzle of the self-oscillating & deflecting water jet consists of an upstream nozzle, a downstream nozzle, an oscillating chamber and two switches. It is experimentally shown that the deflective angle may reach 9.53 degree. The generated pressure fluctuation is very regular and the jet can efficiently increase the ability for breaking and cutting by eliminating the water cushion effect associated with a continuous jet.