工程测量中的坐标变换

针对城市工程测量中经常遇到不同坐标系之间的成果转换问题 ,提出了一种非常简单实用的方法 ,该方法的基本原理是将一个坐标系中的坐标成果换算成实际的距离与方位 ,然后利用这实际的距离与方位计算在另一坐标系中的成果。论文最后给出了一实例说明这种转换的可靠性     

NEW ALTERNATING DIRECTION FINITE ELEMENT SCHEME FOR NONLINEAR PARABOLIC EQUATION

A new alternating direction (AD) finite element (FE) scheme for 3-dimensional nonlinear parabolic equation and parabolic integro-differential equation is studied. By using AD, the 3-dimensional problem is reduced to a family of single space variable problems, calculation work is simplified; by using FE, high accuracy is kept; by using various techniques for priori estimate for differential equations such as inductive hypothesis reasoning, the difficulty arising from the nonlinearity is treated. For both FE and ADFE schemes, the convergence properties are rigorously demonstrated, the optimal H1-and L2-norm space estimates and the 0((△t)2) estimate for time variable are obtained.     

THE TRANSFER BEHAVIOUR OF SOME CATIONS AT WATER／NITROBENZENE INTERFACE BY SEMIDIFFERENTIAL CYCLIC VOLTAMMETRY

The transfer of Sr~(2+) and Ba~(2+) ion, facilitated by 18-Crown-6 present in the aqueous phase, and of succinylcholine ion at w/nb interface were investigated by semi-differential cyclic voltammetry. A good polarographic curve of succinylcholine ion dissolved in water was obtained in the system of 0.01 mol/l LiCl (w)——0.01 mol/l TBATPB (nb). The peak current is directly proportional to the concentration of SC~(2+) ion. It can be used for the determination of SC and the detection limit is 1.05×10~(-5) mol/l.The apparent D~w and D~(nb) have been estimated. The transfer of Sr~(2+) and of Ba~(2+) at the interface are facilitated by 18-Crown-6 present in the aqueous phase and the peak current is directly proportional to the concentration of 18-Crown-6 in water. This method can be used for the determination of the complexing agent and for the stability constant of the complex formed in the aqueous phase.All the experimental results are in keeping with the theoretical.     

Rheological and diffusion properties of a dextran-con A polymer in the presence of Insulin and Magnesium

Previous work carried out in our laboratories has focused on the formation and investigation of a dextran and concanavalin A (con A) based gel, which has the ability to alter its conformational structure in the presence and absence of free and terminal glucoses such that a gel–sol phase transition occurs. Here we report the diffusion and rheological investigations in to the effects of the addition of insulin and varyingconcentrations of magnesium chloride hexahydrate (Mg₂Cl₂6H₂O) at 20 and 37 °C. Rheological examination of glucose-sensitive (dextran-con A) gels were conducted using a cone and plate viscometer used in continual rotation and oscillatory modes. The results are interpreted in terms of the structure of the gel network and suggest rheological assessment provides an effective method of assessing the properties of gel systems. The subsequent testing of such formulations in in-vitro diffusion experiments revealed a reduction in the rate of diffusivity in the insulin marker, poly R-478 dye. The performance of this self-regulating drug delivery system has been examined and the addition of insulin and magnesium chloride may alter the way in which the gel operates as a drug delivery device and in the delivery of insulin. This may have implications for other ligands.     

造纸污冷凝水中挥发醇的测定

本实验用自行研制的简易气提－浓缩装置，与气相色谱仪联用，在适当的实验条件下，对造纸污冷凝水中微量低沸点挥发醇的混合物进行了有效的测定。检测下限为～１０μｇ／Ｌ，变异系数＜１０％，加标回收率＞８１％。     

新型延缓交联体系

用氧氯化锆和柠檬酸钠反应制得一种新型的延缓交联的交联剂──柠檬酸锆。用正交设计和粘度法得到了制备柠檬酸锆的最佳条件，即：氢氯化锆与柠檬酸钠的摩尔比为２：１．ｐＨ值为７．试验结果表明，柠檬酸锆可以延缓锆对聚丙烯酰胺、瓜尔胶、羟甲基瓜尔胶、羟乙基瓜尔胶、羟丙基瓜尔胶的交联速度。交联速度随聚合物浓度、柠檬酸锆对聚合物的质量比、温度、水的矿化度的增加而增加．柠檬酸锆对ＰＡＭ通过羧基交联，对瓜尔胶通过羟基交联。     

浅析普通机床的数控改造

论述了普通机床数控改造的可行性、必要性和经济性，并对C620-1型普通机床的数控改造过程进行了较详细的总结和论述，对普通机床的数控改造具有实际的指导作用。     

21世纪党校图书馆工作面临的挑战与对策

针对21世纪党校图书馆工作面临的挑战与目前的现状，提出了适应时代新要求的党校图书馆工作管理的对策。     

应用全谱直读光谱仪测定原油中铁和钙元素的含量

提出了利用电感耦合等离子发射光谱ICP -AES法测定原油中铁、钙元素含量的方法 ,考察了雾化压力、RF功率等对被测元素分析线强度的影响 ,确定了仪器的最佳使用条件。试验表明 ,该方法简便、快速、精密度和准确度均令人满意 ,能满足实际应用的要求     

Amniotic membrane transplantation for porous sphere orbital implant exposure

Objective: This study is aimed at describing the clinical outcome of amniotic membrane transplantation for exposure of porous sphere implants. Methods: A retrospective review of consecutive cases of porous sphere orbital implant exposure was carried out. Eight cases were presented between May 2004 and Oct. 2006 (5 males, 3 females; mean age 44.5 years). Six had enucleation and two had evisceration. Exposure occurred in two primary and six secondary. Orbital implant diameter was 22 mm in seven cases and 20 mm in one case. Six patients are with hydroxyapatite and two with high-density porous polyethylene (Medpor) orbital implants. The mean time from implantation to exposure was 1.1 months (range 0.8~2 months). All patients required surgical intervention. Results: The time of follow-up ranged from 3.0 to 28.0 months (mean 16.5 months). Amniotic membrane grafting successfully closed the defect without re-exposure in all of these patients. The grafts were left bare with a mean time to conjunctiva of about 1 month (range 0.8~1.5 months). Conclusion: Exposed porous sphere implants were treated successfully with amniotic membrane graft in all of patients. The graft is easy to harvest. This technique is useful, dose not lead to prolonged socket inflammation and infection, and it is valuable application extensively.