降低FCC汽油硫含量的催化裂化催化剂评价

提出了在催化裂化过程中进行汽油催化脱硫的技术路线，研制出催化裂化汽油脱硫催化剂DS-Z3。以减压蜡油为原料，在固定流化床反应装置上对其性能进行了评价。结果表明，该催化剂不管是作为催化裂化催化剂单独使用，还是与普通的FCC催化剂混合使用，都具有明显的脱硫效果，并能不同程度地提高汽油和C3 C4的收率。此外，使用催化裂化脱硫催化剂DS-Z3还可以使汽油在烯烃含量下降的同时，辛烷值有所增加。     

水文资料整编管理系统的设计思路及功能实现

介绍了水文资料整编管理系统的设计思路、数据结构及功能实现，采用Microsoft Visual Basic6．0为开发工具，以Microsoft Access2000为数据管理平台，包括了数据采集录入、计算整理汇总、图形绘制、报表打印，在水文资料整编中有较强的应用价值．     

摩擦离合器的数学模型及其算例

用力学分析的方法 ,建立了摩擦离合器的数学模型 ,求出了摩擦离合器中扭力弹簧的圈数 ,其计算值与实际值基本一致 .该模型对摩擦离合器的设计有一定的参考价值 .     

Field Emission from Silicon Nanocrystallite Films with Compact Alignment and Uniform Orientation

Patterned silicon nanocrystallite (SINC) films were fabricated on (100) orientation p-type boron-doped sificon wafer by the hydrogen ion implantation technique and the anodic etching method. The efficient field emission with low turn-on field of about 3.5V/μm at current density of 0.1μA/cm^2 was obtained. The emission current density from the SiNC films reached 1mA/cm^2 under a bias field of about 9.1V/μm. The experimental results demonstrate that there are great potential applications of the SiNC films for fiat panel displays. A surface treatment with hydrogen plasma was performed on the SiNC films and a significant improvement of emission properties was achieved.     

Effect of Incident Intensity on Films Growth in Pulsed Laser Deposition

Incident intensity, defined by the amount of particles deposited per pulse, is an important parameter in the film growth process of pulsed laser deposition （PLD）. Different from previous models, we investigate the irreversible and reversible growth processes by using a kinetic Monte Carlo method and find that island density and film morphology strongly depend on pulse intensity. At higher pulse intensities, lots of adatoms instantaneously diffuse on the substrate surface, and then nucleation easily occurs between the moving adatoms resulting in more smaller-size islands. In contrast, at the lower pulse intensities, nucleation event occurs preferentially between the single adatom and existing islands rather than forming new islands, and therefore the average island size becomes larger in this case. Additionally, our results show that substrate temperature plays an important role in film growth. In particular, it can determine the films shape and weaken the effect of pulse intensity on film growth at the lower temperatures by controlling the mobility rate of atoms. Our results can match the related theoretical and experimental results.     

关于新旧教材比较及对教学的启迪--以万有引力定律教学为案例

l比较新旧教材的意义 对教师而言，比较新旧教材，无疑是教学活动中不可缺少的环节．通过新旧教材的对比，可以使教师掌握教材编排．更重要的是，通过新旧教材对比，让教师更好地领会新旧教材的不同，进而了解编者的意图，体会新课程标准的理念，从而在教学活动中更好地理解和落实新课程标准．下面，笔者以2004年初审通过的广东教育出版社出版的《普通高中课程标准实验教科书物理（必修2）》第三章第一节“万有引力定律”，     

一类具有二维分叉方程的积分方程的分叉

本文研究一类含参数的非线性积分方程的分叉问题,其中的积分算子的线性化算子在分叉值点处有二维零空间。利用Liapunov-Schmidt约化方法和基于系统的对称性的群论方法,得到了周期分叉解存在的充分条件。     

Numerical Study on Left-Handed Materials Made of Ferrite and Metallic Wires

Due to coupling effect, we show that it is difficult to realize the left-handed material by placing metallic wires directly into a ferrite matrix. However by introducing an insulating material round the metallic wires to decouple the direct interaction between the metallic wire and ferrite matrix, we have proposed two microstructures, which are shown by numerical simulation to have negative refractive indexes. The influence of microstructure on the transmission property is also examined.     

醚类汽油添加剂与L-02正常人肝细胞、人血红蛋白的体外作用研究

研究了新型无铅汽油添加剂甲基叔丁基醚（MTBE）、甲基叔戊基醚（TMAE）对正常人肝细胞系L－02的毒性作用，在较高浓度下，MTBE、TAME均对L－02正常人肝细胞的生长有影响，且TAME的毒性作用稍强，另外，用FT－IR法和^1H-NMR法研究了MTBE、TAME与人血红蛋白的体外作用，结果显示，MTBE、TAME与人血红蛋白无明显的直接作用。