计算机辅助药物设计专家系统Apex中镇痛药物数据库的建立

文章扼要介绍了计算机辅助药物设计专家系统Ａｐｅｘ中镇痛药物建立的方法和过程，同时也讨论了用药物设计专家系统Ａｐｅｘ进行全新药物设计的方法，并依据哌替啶类药物的药效团设计了一个与这一药效团相符的新化合物。     

高海拔长日低温条件下选择水稻光温敏核不育系的效果和方法研究

在高海拔长日低温、低海拔日高温、低海拔长日高温和人工气候室长光低温条件下，进行了光温敏不育水稻分离世代的不育株出现频率以及选择实用型不育系的效果和选择方法的研究。     

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煤层气采出有扩散和渗流两个过程，比常规天然气层中的渗流方程复杂。煤层气由煤层流入井筒的过程为：随着煤层中水的不断采出，地层压力下降，吸附在煤层中的煤层气被解吸出来，并扩散至割理，割理中的气体渗流到达井筒。采用非平衡态吸附模型，研究单相煤层气在煤体和割理中的流动规律。在拟稳态流和不稳态流的数学模型假设下，用气体标准压力代替Ｌａｎｇｍｕｉｒ吸附公式中的压力，得到气层中标准压力所满足的方程。如果考虑无限大地层或有界圆形封闭和定压地层，最终得到井底无量纲准压力及其导数的解。     

浅谈实验室检验在科研生产中的作用

文章阐述了实验窀检验在科研生产中的作用及发挥作用的巨大潜力。     

Investigation of Scale Formation in Heat Exchangers of Phosphoric Acid Evaporator Plants

The primary problem in concentrating phosphoric acid is due to fouling on the tube‐side of the heat exchangers of the evaporator units. Scaling on the heat transfer surfaces occurs because of high supersaturation of phosphoric acid liquor with respect to calcium sulphate. A review of the existing literature reveals that no information is available on heat transfer and on crystallization fouling of industrial phosphoric acid solutions. In this investigation, the solubility of different calcium sulphate types in phosphoric acid solution was studied and its dependency on acid concentration and temperature was investigated. A large number of fouling experiments were carried out in a side‐stream of a phosphoric acid plant at different flow velocities, surface temperatures and concentrations to determine the mechanisms, which control the deposition process. After identifying the effects of operational parameters on the deposition process, a model was developed for prediction of fouling resistances. The reaction of calcium sulphate crystallization followed a second order rate with respect to the supersaturation. The activation energy evaluated for the surface reaction of the deposit formation was found to be 57 kJ/mol. The predicted fouling resistances were compared with the experimental data. Quantitative and qualitative agreement between measured and predicted fouling rates is good.     

Side-Track Erasure Processes in Perpendicular Recording

In perpendicular recording, substantial erasure of the stored data patterns can occur during the writing process. Among all those erasure processes, side-track erasure (STE) is one of the critical issues in drive head/media integration. Unlike the adjacent track erasure (ATE) process, the locations of the STE affected areas are often many tens of tracks away from the central writing track location. In this work, we report on an experimental investigation and quantification of the general attributes and the origins of the STE processes in various situations. Particularly, we thoroughly characterize some distinctive signatures and behaviors of STE processes by employing both the amplitude- and bit-error-rate-based STE measurement methods in combination with a novel magnetic force microscope characterization technique     

Preparation and characterization of polyurethane microcapsules containing n‐octadecane with styrene‐maleic anhydride as a surfactant by interfacial polycondensation

A series of polyurethane microcapsules containing a phase change material (PCM) of n‐octadecane was successfully synthesized by an interfacial polymerization in aqueous styrene‐maleic anhydride (SMA) dispersion with diethylene triamine (DETA) as a chain extender reacting with toluene‐2,4‐diisocyanate (TDI). The average diameter of microPCMs is in the range of 5–10 μm under the stirring speed of 3000–4000 rpm. Optical and SEM morphologies of microPCMs had ensured that the shell was regularly fabricated with the influence of SMA. FTIR results confirmed that the shell material was polyurethane and the SMA chains associated on core material reacted with TDI forming a part of shell material. The shell thickness was decreasing in the range of 0.31–0.55 μm with the molar ratio of DETA/TDI from 0.84 to 1.35 and the weight of core material increasing from 40 to 80% (wt %). By controlling the weight ratio of PCM as 40, 50, 60, 70, and 80% in microPCMs, it was found using DSC that the T_m and T_c of microPCMs were in the range of 29.8–31.0^oC and 21.1–22.0°C and an obvious phase change had been achieved nearly the same temperature range of that of PCM. The results from release curves of microPCM samples prepared by 1.4, 1.7, and 2.0 g of SMA indicated the release properties were affected by the amount of the dispersant, which attributed to the emulsion effect and shell polymerization structure. The above results suggest that the shell structure of microPCMs can be controlled and the properties of microPCMs determined by shell will perform proper practical usage. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4996–5006, 2006     

梳针刺辊与锯齿刺辊分梳差异的研究

为研究刺辊类型、速度对纤维损伤和去除结杂的影响,用Uster AFIS单纤维测试系统,分别对三种梳针刺辊和一种锯齿刺辊在二档道夫速度和四档刺辊速度条件下所加工的生条进行了检测.结果显示:梳针刺辊在减少纤维损伤方面明显优于锯齿刺辊;梳棉机产量低时,梳针剌辊去除棉结的效果好一些,梳棉机产量高时,锯齿刺辊去除棉结的效果要好于梳针剌辊;梳棉机产量低时,大都以锯齿和梳针Ⅲ刺辊去除杂质效果好些,梳棉机产量高时,锯齿和梳针Ⅱ刺辊去除杂质效果好些.