高钙油田污水复合防垢剂

以某种工业废水为主要原料，复配以表面活性剂、有机膦酸以及聚马来酸酐，在室内制得了价廉高效的防垢剂ＺＨ－１和ＺＨ－２，在模拟南疆沙参２井高钙（６０００ｍｇ／ｌ）、高矿化度（１．３×１０￣５ｍｇ／ｌ）采出水中测得防垢率达９５％以上。该二种剂可耐受Ｃａ￣（２＋）８０００ｍｇ／ｌ、ＨＣＯ＿３１０００ｍｇ／ｌ，使用ｐＨ范围≤６。     

天津国展中心扩建工程钢管桁架制作过程质量控制

介绍了大跨度空间三维管桁架的制作过程以及对其尺寸精度和焊接的质量控制。     

沥青加铺层改造机场旧水泥跑道防裂措施试验研究

机场旧水泥混凝土跑道采用沥青加铺层改造，是解决老机场跑道损坏问题的有效途径，但如何延缓与防治反射裂缝是突出的问题，为此，利用大型反射裂缝试验设备在室内进行足尺板试验，研究分析了几种常用防裂层抗反射裂缝的能力，以寻求最佳的防裂措施，为沥青加铺层的设计与施工提供依据。     

A study on yttrium doping in lead tungstate crystals

In this paper we present results of a study on the yttrium doping in lead tungstate crystals. The crystal growth by modified Bridgman method is described. Results of trace analysis on raw materials and crystals are presented. The segregation coefficient of yttrium ions in lead tungstate crystals was determined. The scintillation emission and longitudinal transmittance spectra, light output, decay kinetics, light response uniformity and radiation damage were measured. It is found that yttrium doping suppresses slow scintillation component and improves radiation hardness of lead tungstate crystals.     

THE RE-DERIVATION OF THE VORTICITY EQUATION OF THE LAYERED FLOW OF THE SHALLOW SEA

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＦｏｒｔｈｅｌａｒｇｅ ｓｃａｌｅｏｃｅａｎｉｃｆｌｏｗ ,ｐｅｏｐｌｅｕｓｕａｌｌｙｓｅｅｋｔｈｅｓｏｌｕｔｉｏｎｓｆｒｏｍｔｈｅｑｕａｓｉ ｇｅｏｓｔｒｏｐｈｉｃｖｏｒｔｉｃｉ ｔｙｅｑｕａｔｉｏｎｄｅｒｉｖｅｄｆｒｏｍｔｈｅｐｅｒｔｕｒｂａｔｉｏｎｂｙｕｓｉｎｇＲｏｓｓｂｙｎｕｍｂｅｒεａｓａｌｉｔｔｌｅｐａｒａｍｅｔｅｒ.Ａｎｉｍｐｏｒｔａｎｔａｐｐｒｏｘｉｍａｔｉｏｎｗｈｅｎｄｅｄｕｃｔｉｎｇｖｏｒｔｉｃｉｔｙｅｑｕａｔｉｏｎｉｎｔｈｅｌａｙｅｒｅｄｓｅａｗａｔ…     

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.