前馈和反馈相结合的控制策略在宝钢线材厂控冷轧线上的应用实践

在详细分析料坯在水箱内冷却热过程特点的基础上，提出了前馈和反馈相结合的水流量优化控制策略，并将该策略应用于宝钢线材厂控冷轧线上。实际运行结果表明：该策略能够合理地控制水箱水流量，从而保证了线材水箱出口处的温度满足工艺要求，大大提高了线材成品的质量。所做工作对国内同类企业有重要的意义。     

Temperature Dependence of Ultra-Low-Frequency Dielectric Relaxation of Barium Titanate Ceramic

Based on a linear voltage ramp method, ultraslow dielectric relaxation of undoped BaTiO₃ ceramic has been carefully measured over the temperature range between − 180° and +120°C. Temperature dependence of the dielectric constant in the frequency range from 10 ⁻⁵ to 10⁻¹ Hz can be obtained using Kramers–Kronig equations. Close to the Curie temperature, the dielectric constant increases so rapidly that the Curie peak is overwhelmed. Two kinds of relaxation processes were observed in this experiment. Ferroelectric domain and mobile charge are proposed to be responsible for the relaxation over the temperature range. With temperature increasing, Maxwell–Wagner relaxation associated with mobile charge gradually dominates. From relaxation time constants at various temperatures, relaxation activation energies about 0.06 and 0.09 eV are identified.     

丁苯胶乳改性道路沥青的推广应用

用丁苯胶乳对胜利１００号沥青进行改性试验．发现随着胶乳掺量的增加．沥青的高温性能、粘结性能改善幅度也大。但综合考虑沥青生产成本等因素．认为：对丁苯胶乳改性胜利１００号道路沥青．掺胶量控制在２％即可满足一般高等级道路工程的需要。文中还介绍了丁苯胶乳沥青近年来的推广使用情况并做了相应的技术经济分析和建议。     

吲哚美辛对荷瘤小鼠抗肿瘤作用机制的实验研究

用微观放射自显影技术及免疫组化法探讨了非甾体类抗炎药吲哚美辛(IN)对Lewis肺癌的生长抑制作用机制。结果显示:与对照组相比,实验组IN的抑瘤率为55.05%;IN可显著下调Bcl-2蛋白的表达(t=6.154,P<0.001),对Bax蛋白的表达没有明显影响(t=2.101,P>0.05)。放射自显影结果显示,在肿瘤细胞的细胞膜、细胞浆及细胞核中均有黑色银颗粒分布,且在用药后12 h时肿瘤组织中的平均银颗粒数高于4、7、243、6 h时。以上结果表明,IN可抑制Lewis肺癌的生长,其机制与下调抗凋亡蛋白Bcl-2的表达及降低Bcl-2/Bax的比值有关;IN可进入到肿瘤细胞内发挥抗肿瘤作用。     

聚合物驱流线数值试井解释模型及其应用

针对生产和关井两个阶段分别建立了考虑复杂因素影响的聚合物驱流线数值试井解释模型，两个阶段均考虑了油藏非均质性、聚合物驱、油水两相流、多井等因素的影响。该流线试井解释模型采用最新的流线方法进行一维求解，具有更高的求解速度和稳定性，同时它比现有模型更加接近于油藏真实环境，具有更高的现场实用性。     

溶胶-凝胶法制备TEOS-DOS基SiO2疏水减反射膜:溶胶微结构对膜性能的影响

以乙醇为溶剂,正硅酸乙酯(TEOS,tetraethoxysilane)在氢氧化铵催化下水解缩聚为纳米尺度的无定型SiO2溶胶颗粒,二甲基二乙氧基硅烷(DDS,dimethyldiethoxysilane)在盐酸催化下水解缩聚为线状聚二甲基硅氧链.用混合溶胶在玻璃基片上旋转镀膜,然后于80℃空气气氛下热处理.实验证明通过DDS将疏水的双甲基链引入镀膜胶体,使膜兼具疏水性和减反射性能.利用激光散射粒度分析仪和电子显微镜研究了溶胶颗粒的粒度变化和聚集情况等溶胶微结构,用物理吸附仪研究了膜的孔结构,考察了热处理前后膜的疏水性和透射谱,得到了溶胶微结构与膜性能之间的关联.     

液压同步剪系统的设计

本文通过对蜂窝陶瓷载体成型过程的分析，指出在其成型过程中存在的问题，提出了采用液压同步剪解决这些问题的方法。论文分析了同步剪的工作原理，给出了其液压原理图及其设计特点。     

富氧氮氧化硅薄膜退火的研究

利用红外吸收(IR)谱和X射线光电子谱(XPS)对富氧氮氧化硅(oxygen-rich SiOxNy)及其在600、750和900℃下退火后样品的微结构进行了研究.实验中除观察到N、H的释放外,首次发现退火会导致SiOxNy中O的释放,同时还发现退火温度不同,H、O、N元素的释放量以及微结构的变化都不相同,根据这些现象,提出了5个化学反应过程并予以解释.     

DNA/lipid complex organogel with shape‐memory behavior

DNA and amphiphilic N,N,N‐trimethyl‐N‐hexadecylammonium bromide (THAB) were stoichiometrically mixed together to produce a DNA–lipid complex, which was dissolved in dimethyl sulfoxide (DMSO) at 65°C and then crosslinked with isophorone diisocyanate (IPDI). The obtained organogel swelled reversibly in DMSO, responding to the variation of temperature. Interestingly, we observed that the gel exhibited a temperature‐dependent shape‐memory behavior. Above 65°C, whatever the shape the gel was deformed to, it could retain the new shape as the temperature was decreased to room temperature, while, when the gel was heated to 65°C again, it could recover its initial shape. The shape‐memory characteristic is supposedly originated from the transition between the close‐packed and the destroyed DNA/lipid conformation. The elastic urethane crosslinking bonds between base‐pair sites act as a fixing phase. The gel holds promise in its application as a gentle actuator. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 259–263, 2002