恶性梗阻性黄疸支架再梗阻的多因素分析

目的探讨恶性梗阻性黄疸支架置入后再梗阻的相关危险因素。方法回顾性分析发生胆道内支架再梗阻资料完整的５０例恶性梗阻性黄疸患者,分析影响胆道支架再梗阻的相关危险因素。结果单因素分析表明原发肿瘤类型、肿瘤临床分期、梗阻部位、是否合并感染、支架治疗后是否应用抗肿瘤治疗是影响胆道支架再梗阻的相关因素;多因素分析表明肿瘤临床分期、梗阻部位、是否合并感染是影响胆道支架再梗阻发生的重要因素。结论肿瘤临床分期、梗阻部位、是否合并感染是评价恶性梗阻性黄疸胆道支架再梗阻的重要参考因素     

自动电位滴定法测定烟草中的无机氯

对烟草中无机氯含量的自动电位滴定法分析的全过程进行了研究 ,确定该项分析的最佳条件为 :2g烟样 ,用 1%HNO3溶液 5 0mL浸取 5min ,然后加入 0 10 0 0mol·L- 1NaCl溶液 5 0 0mL ,固定终点电位为 15 5mV ,用AgNO3标准溶液进行自动电位滴定 .在此条件下 ,样品中Cl- 的加标回收率为 99%～ 10 1% .该方法准确度高 ,重现性好 ,分析速度快     

全过程系统用能分析与调优

大规模化工系统工序多 ,物流多 ,能耗大 ,用能状况复杂 ,其节能改造是过程系统热集成的难点。应用全过程系统热集成技术 ,对某一大规模化工系统的总体用能状况进行了分析 ,确定了系统的用能“瓶颈” ,并利用用能一致性原则对其“瓶颈”即反应器部分进行改造 ,通过改变公用工程使用状况等易实施的措施 ,节能可达 30 %。     

Simple and Straightforward Synthesis of Porous Ionosilica for Efficient Chromate Adsorption

We report a very simple synthesis strategy for the formation of moderately porous ionosilica materials containing ammonium groups. We synthesized an ionosilica xerogel and an ionosilica aerogel, either via conventional or supercritical work‐up. The synthesis scheme of both precursor and ionosilica materials could easily be up‐scaled to a 100 g scale. All syntheses and work‐up procedures are sustainable as no additional agent and very low quantities of solvents were used, and no additional purifications steps were necessary. Although both materials show excellent anion exchange properties for chromate adsorption, noticeable differences were found regarding the thermodynamics of the exchange process. We attribute these differences to different surface chemistries of the materials, induced by the different work‐up procedures. Due to the easy availability of high quantities of material, ionosilicas can be implemented as functional ion exchange materials in larger scale processes, thus opening new fields of applications.     

Adhesion and Removal of Particles from Surfaces Under Humidity Controlled Air Stream

The adhesion and the removal of individual micrometer-sized particles on a plane substrate are studied using an air shear flow cell. Laminar isothermal compressible flow characterization enables us to analyze the effect of various parameters such as particle size, air humidity, surface nature and surface charge on the aerodynamic forces required to remove the particles from the substrate. The results show that the increase of humidity (up to a critical value) favors particle removal when particles adhere under strong electrostatic forces on a non-conductive charged substrate. On the contrary, the existence of a capillary force disfavors particle removal beyond this critical humidity. The increase of the humidity disfavors the removal of particles in contact with an uncharged substrate. The results are interpreted in terms of a global adhesion force using a force and torque balance on a single particle in contact with a plane substrate. Moreover, the use of a high-speed video recording system enables us to determine the particle removal mechanisms as a function of the particle Reynolds number.     

水轮机调整器并联型液压控制系统

在详细分析水轮机调速器流压控制系统的结构和工况的基础上,提出了一种新型的水轮机调速器液压控制系统,水轮机调速器并联型液压控制系统。它由1个可连续调节流量的小流量阀和1个开关型的大流量阀构成的并联系统完成自动调节控制。对它的控制策略及稳定性进行了分析,并对比例阀和方向阀并联系统进行了讨论。     

Analysis of a fuel cell micro-grid with a small-scale wind turbine generator

If electric power is supplied using an independent micro-grid connected to renewable energy, it can flexibly match the energy demand characteristics of a local area. And an independent micro-grid is expected to be effective in cutting greenhouse gas discharge and energy costs, as well as in eliminating the need for an emergency power supply system. Since the output of renewable energy is unstable, other energy equipment needs to cover the stability of output. Thus, the operating conditions of an independent micro-grid that supplies power with natural power sources and fuel cells are investigated. The operation conditions of a fuel-cell independent micro-grid with wind power generation were investigated by numerical analysis. Step loads and an apartment house power load model were analyzed using the dynamic characteristics of a fuel cell obtained from experiments. The output of wind power generation and fuel cells is controlled by proportional-integral control of an independent micro-grid for rapid power demand change.     

药学专业有机化学实验PBL教学法探讨

为了提高药学专业有机化学的教学质量,增强学生的学习兴趣,在有机化学教学中引入问题教学法(Problembased learning,PBL),先以有机化学实验作为试点,通过一学期的实践,证明PBL教学法可以提高学生学习兴趣,培养学生自己解决问题的能力,效果较好,为下一步在理论课上推广积累了经验。     

从重选尾矿中浮选回收微细粒白钨矿试验研究

澳大利亚Watershed白钨重选尾矿含WO30.45%,其中-25μm的微细粒级金属分布率高达83.59%,且含有碳质、云母等易浮脉石,回收较为困难。针对此难选矿样进行了白钨浮选回收试验研究,最终以BK416为捕收剂,采用"预先浮选—常温浮选—加温精选"工艺,获得了WO3品位59.13%的钨精矿,选矿回收率65.72%。     

长输管线球阀结构的设计研究

介绍了一种新型的管线阀门——紧急切断球阀，并对主要结构进行了详细论述。