三偏振系统用于高精度可调衰减器的实验研究

用三只高消光比的冰洲石偏光棱镜组成的高精度可调光学衰减系统,具有使用波带宽(0.3～3μm),可调范围大(约50 dB),读数精(相对误差小于5％)的优点。     

乳化稠油选择性堵剂的室内研究

阐述了乳化稠油堵水的机理，分析了影响乳化稠油性质的各种因素，对出现的问题提出了相应的解决方法，为今后油田的乳化稠油选择性堵水提供了室内实验数据，并对乳化稠油的堵水效果进行了评价。     

Effective medium theory of magnetization reversal in magnetically interacting particles

We report an effective medium theory of magnetization reversal and hysteresis in magnetically interacting particles, where the intergranular magnetostatic interaction is accounted for by an effective medium approximation. We introduce two dimensionless parameters, /spl lambda/ and h/sub 0/, that completely characterize the hysteresis in a ferromagnetic polycrystal when the grain size is much larger than the exchange length so that the exchange coupling can be ignored. The competition between the anisotropy energy and the intergranular magnetostatic energy is measured by /spl lambda/, while the competition between the anisotropy energy and Zeeman's energy is measured by h/sub 0/. The hysteresis loop, magnetostatic energy density, and anisotropy energy density calculated by using this theory agrees well with micromagnetic simulations. The calculations also reveal that the subnucleation field switching due to the magnetic field fluctuation is important when the magnet is not very hard, and that has been accounted for by a probability-based switching model.     

Erosion‐corrosion of Q235 and 5Cr1/2Mo steels in oil with naphthenic acid and/or sulfur compound at high temperature

The erosion‐corrosion behaviors of Q235 steel and 5Cr1/2Mo steel in oil with naphthenic acid and/or sulfur compound at high temperature were studied in a hot oil loop simulating oil refining environments. The effects of impinging flow rate, incidence angle, and total acid number (TAN), and sulfur content on erosion‐corrosion behavior were assessed. The eroded surfaces were characterized by scanning electron microscopy (SEM) and XPS. The results showed that both corrosion resistance and hardness of steels play an important role in combating erosion‐corrosion. Sulfide films formed on the surface were significant in understanding the erosion‐corrosion behavior when both naphthenic acid and sulfur compound were present. Erosion‐corrosion regimes were determined on the basis of mechanism analysis of the damage process.     

Feeding of high-nickel alloy castings

Feeding of the nickel-based alloys CZ-100, M-35-1, and CW-12MW, as well as of the austenitic stainless steel CN-7M, is investigated, using a combination of casting experiments and simulation. Casting trials are performed at five foundries, to produce a total of 55 plates of varying lengths and radiographic soundness levels. In order to develop the property databases necessary to simulate the casting of these alloys, temperature data are recorded for each alloy during the casting trials. These measured data are used in conjunction with material property simulation to develop the necessary property data for each alloy, including the solidification path. These property data are used to simulate the casting trials. Good agreement between the simulation results and the radiographic testing (RT) results for the castings is obtained. A quantitative relation between the measured ASTM X-ray levels and the predicted minimum Niyama criterion value is established for all but the CZ-100 alloy, which does not appear to suffer from shrinkage defects. A large number of additional simulations are used to develop general feeding distance (FD) rules. The new rules are shown to provide accurate FDs for the casting trial plates. The FDs of the high-nickel alloys (except CZ-100) are found to be at least 25 pct shorter than those for typical low-alloy steels.     

Ti中间层对超薄Ni膜硅化反应特性的影响

在多种Si衬底上利用离子束溅射淀积超薄Ni膜以及Ni/Ti双层膜,经过快速热退火处理完成薄膜的固相硅化反应,通过四探针法、微区喇曼散射法和俄歇深度分布测试法研究了Ti中间层对Ni硅化反应的影响.实验结果证明Ti中间层抑制了集成电路生产最需要的NiSi相的形成.     

运城市城区地下咸水资源开发利用前景及措施探讨

运城市城区地下深层承压水严重超采，地下浅层咸水一直未被人们充分认识和利用。本文在分析区内水资源开发利用现状及程度的基础上，对地下浅层咸水资源开发利用前景及措施进行探讨，以浅（咸）代深（淡），涵养深层水源，达到水资源可持续利用。     

渐变芯应力保偏型光纤:模型

本文提出一个渐变芯应力保偏型光纤的数学模型。结果表明,我们的结果与文献[3]的结果吻合得很好。     

一种适用于突发信号的AGC电路的实现

介绍了反馈AGC一般工作原理,然后提出了一种适合于突发信号的AGC电路,给出了它的电路框图,并分析了工作原理和影响环路特性的设置。电路在反馈回路使用了数字逻辑器件,具有灵活可变的特点。