雷诺值对T型微混合器中二元流体混合效果的影响

微管内二元流体的混合问题是微流动领域中最基础的问题之一,其应用跨越了当今各个专业领域(如反应,气体吸收,乳化,起泡和调配等的样品制备).T型微管是一种经典的微混合器,本文利用格子玻尔兹曼方法(简称LBM)模拟了该混合器在不同雷诺值条件下的混合效果,并讨论了雷诺值对混合效果影响的条件.     

2D general solution and fundamental solution for orthotropic thermoelastic materials

The 2D general solution for the plane problem of thermoelastic materials is derived in terms of three harmonic functions using strict differential operator theory for the case of distinct eigenvalues. Based on the obtained general solution, the 2D fundamental solution for a steady line heat source in an infinite and a semi-infinite thermoelastic plane is obtained by three newly introduced harmonic functions. All components of coupled fields are expressed in terms of elementary functions and they are convenient to be used.     

Experiments and prediction of in-cavity stress for injection molded part

Prediction of residual stress of the injection molded polymers is one of the most challenging issues in this process. To investigate the development of this residual stress, creep experiments were carried out and creep rule was found. In the light of the experimental results, a creep model for predicting in-cavity stress of the molding was built. The elastic module of material was obtained with Tait equation and its viscous factor obtained with inversion method. In-cavity stress was calculated with the model and finite element method for an injection molded plate made by ABS. The predicted results was verified by the experiments and compared with relaxation model. The results showed that the new model was more accurate than relaxation model. The solution of the problem will effectively prompt the numerical simulation of injection molding, and will be a valuable development for the quality control.     

The direct determination of the vacancy concentration andP-T phase diagram of Hg0.8Cd0.2Te and Hg0.6Cd0.4Te by dynamic mass-loss measurements

A modified mass-loss measurement technique is employed, for the direct,in- situ determination of the metal vacancy formation in (Hg_1x2212;itxCd _x )_1−y Te _y (s) withx = 0.2 and 0.4. Forx = 0.2, the metal vacancy concentrations are determined between 336 and 660° C for three different compositions(y) within the homogeneity region and range from 2.4 to6.8 x 10¹⁹cm₋₃. The enthalpy of formation of a singly-ionized metal vacancy is derived to be between 0.17 and 0.45 eV depending upon the deviation from stoichiometry (compositiony). Forx= 0.4, three samples of different y-values give the metal vacancy concentrations from 1.9 to 5.5 x 10¹⁹cm⁻³ between 316 and 649° C, and the enthalpy of vacancy formation between 0.25 and 0.40 eV. Compared to the recent data on HgTe(s), these experimental results show a slight but significant decrease in the enthalpy of vacancy formation from HgTe to Hg_0.8Cd_0.2Te, which supports theoretical predictions of the bond weakening effect of Cd for the latter alloy system. Based on the simultaneously determined equilibrium Hg partial pressures within the homogeneity range, the vacancy concentration-partial pressure isotherms are constructed. The Hg partial pressures are also measured along the three-phase boundaries of the solid solutions of bothx = 0.2 and 0.4, and these are in close agreement with published data obtained by optical absorption measurements.     

地层水化学特征参数判断气藏保存条件——以呼图壁、霍尔果斯油气田为例

油气田地层水在物理和化学性质上都是十分活跃的物体，它与油气伴存，不仅可以改变油气性质，自身也在不断变化。变质系数、脱硫系数、碳酸盐平衡系数、镁钙系数和钠钙系数等常用的地层水化学特征参数，是判断气藏保存条件的重要参数。文章以此几类参数对呼图壁、霍尔果斯油气田的气藏保存条件进行了分析判断。     

Engineering measures to control windblown sand in Shiquanhe Town, Tibet

Shiquanhe is a major city in the northwestern Qinghai-Tibet Plateau. In response to serious problems with windblown sand, sand-control engineering in the Shiquanhe Basin was designed to be implemented in four stages: 1990-1997, 1998-2001, 2002-2004, and 2005-2006. Based on field observations and wind tunnel experiments, gravel sand barriers and tree shelterbelts were designed to serve as the main measures to control windblown sand, with artificial grasslands and irrigation systems also contributing. Parallel 1.2-m-tall gravel sand barriers were set at an angle of 77° to the prevailing wind direction, at a design spacing equal to 10 times the barrier's height (10H) in the first and second stages of the implementation and 12H in the third and fourth stages. But the first stage was never implemented. With the multiple rows of gravel barriers, wind speed reduction below the threshold values is obtained. Tree shelterbelts are arranged parallel to the gravel sand barriers, with local Salix hangongensis the main species. The permeability of the shelterbelts is designed to be between 50% and 80%. Shelterbelts are separated by 43.2 m, close to 14 times of the height of the shelterbelt. Artificial grasslands will be established between the gravel sand barriers and tree shelterbelts. Field investigations in 2002 and meteorological observations show that the second stage of the sand-control engineering has already begun to provide some beneficial effects.     

甲基六氢苯酐合成产物中主,副产物的GC／MS鉴定

通过对甲基六氢化苯酐合成产物的色谱／质谱（ＧＣ／ＭＳ）分析，得到１２个组份的分析鉴定结果，并对其中副产物产生的原因进行了探讨。     

钢液连续测温技术试验

介绍一种钢水连续测温新技术,该技术通过采用金属陶瓷外套管与双铂铑热电偶组成连续测温。热电偶,具有耐高温钢液熔蚀、抗热震、耐冲刷、不粘钢、精度高等良好性能,适用于连铸中间罐、VOD精炼炉中对钢液连续测温。     

Hilbert-Huang Transform Analysis of Dynamic and Earthquake Motion Recordings

This study examines the rationale of Hilbert-Huang transform (HHT) for analyzing dynamic and earthquake motion recordings in studies of seismology and engineering. In particular, this paper first provides the fundamentals of the HHT method, which consist of the empirical mode decomposition (EMD) and the Hilbert spectral analysis. It then uses the HHT to analyze recordings of hypothetical and real wave motion, the results of which are compared with the results obtained by the Fourier data processing technique. The analysis of the two recordings indicates that the HHT method is able to extract some motion characteristics useful in studies of seismology and engineering, which might not be exposed effectively and efficiently by Fourier data processing technique. Specifically, the study indicates that the decomposed components in EMD of HHT, namely, the intrinsic mode function (IMF) components, contain observable, physical information inherent to the original data. It also shows that the grouped IMF components, namely, the EMD-based low- and high-frequency components, can faithfully capture low-frequency pulse-like as well as high-frequency wave signals. Finally, the study illustrates that the HHT-based Hilbert spectra are able to reveal the temporal-frequency energy distribution for motion recordings precisely and clearly.     

塑料导爆管反应区温度分布的近似计算

导爆管爆轰可近似地处理成气相爆轰,因而可给出其爆轰参数;文中采用高速摄影观测了两种导爆管(普通导爆管和煤矿导爆管)反应区长度,并对其进行了理论计算;在此基础上作合理近似与假设,推导出一组温度计算公式;用迭代法计算可得到导爆管反应区内的温度分布。此外,对导爆管传爆中的某些现象也作了分析。