微机自动检测仪器仪表系统

介绍一种用ＩＢＭ－ＰＣ计算机自动检测仪器仪表系统的设计方法及实现原理，接口电路和软件的设计。     

YBa2Cu3O7—δ超导体中决定Tc的两个内禀因素

本文综合报导我们研究组在YBa_2Cu_3O_(7-δ)的元素替代效应研究中所获得的实验结果和从中获得的重要结论。实验结果表明:正交晶体结构、氧含量、Cu的氧化价态,以及金属——半导体(绝缘体)相变等都只是决定Tc的表观因素;存在着CuO_2平面外和CuO_2平面上元素替代的两种不同机制;体系的载流子浓度和CuO_2平面上Cu原子间的动力学的短程反铁磁关联是决定Tc的两个内禀因素。Y系123相双元素替代和Bi系2212相的实验结果进一步证实了上述结论。     

带内柱筒下层结构的分析

本文介绍并分析了带内柱的筒下层结构,将该种结构与不带内柱的筒下层结构进行了内力及材料消耗等方面的比较.本文为筒仓设计提供了受力合理、施工方便、材料消耗少,造价低的筒下层结构形式,给出了带内柱筒下层结构的近似与精确分析方法.     

环境响应性两亲嵌段共聚物的自组装及其药物控释研究进展

两亲嵌段共聚物形成的胶束、囊泡等典型的自组装体可作为纳米医药载体,用于药物的控释,其研究已成为当前胶化、医药和生物学科交叉领域的热点。尤其是聚乙二醇型两亲嵌段共聚物,不仅具有良好的生物相容性,而且通过适当的分子设计可形成对环境具有刺激响应的纳米载体。本文着重综述了这类两亲嵌段共聚物的自组装及其在药物控释方面的研究,总结了影响自组装的因素,并介绍了控释药物的机理。     

课程教学中大学生诚信培养的实践研究

诚实守信是做人的基本要求。学生在课程学习过程中也必须做到诚信。文章提出了在课程教学中培养学生诚信品质的问题,从学生平时作业、期末考试等方面构建了一套可操控的学生诚信培养方法,通过教学实践及典型案例分析证明了该方法的有效性。     

Synthesis and Bioactivity of 5-Substituted-2-furoyl Diacylhydazide Derivatives with Aliphatic Chain

A series of 5-substituted-2-furoyl diacylhydazide derivatives with aliphatic chain were designed and synthesized. Their structures were characterized by IR, ¹H NMR, elemental analysis, and X-ray single crystal diffraction. The anti-tumor bioassay revealed that some title compounds exhibited promising activity against the selected cancer cell lines, especially against the human promyelocytic leukemic cells (HL-60). Their fungicidal tests indicated that most of the title compounds showed significant anti-fungal activity. The preliminary structure-activity relationship showed that the aliphatic chain length and differences in the R² group had obvious effects on the anti-tumor and anti-fungal activities. The bioassay results demonstrated that the title compounds hold great promise as novel lead compounds for further drug discovery.     

针对去除PM2.5的空气净化技术专利分析

通过对针对去除PM_2.5的空气净化器的相关专利进行分析,探究相关技术的发展趋势。以中国专利文摘数据库中的针对去除PM_2.5的空气净化器相关专利为研究对象,分别从专利申请情况及申请人分布、主要申请人的专利特点、专利发展趋势等方面,研究了中国空气净化器技术的专利布局情况。通过分析得知,该领域的专利申请量从2012年开始出现了迅速增加,可见该领域是从近两三年才开始发展的,但申请量呈现加速上升的态势,具有很大的发展潜力。通过IPC 分类分析了该领域的技术构成,主要包括过滤、调节系统等。从申请人情况来看,申请人主要是国内申请人,占绝对的本土优势。其中,高校的申请占比较多,更侧重于空气净化的核心技术。企业的专利申请则更加侧重于与具体电器的结合。国内申请人主要集中在高校和研究院所,企业申请较少,建议企业和高校及研究院所加强合作,集各家之所长,以进一步推动高校和科研院所的核心技术应用到空气净化器的产业制造中。     

Intelligent decoupling PID control for the forced-circulation evaporation system

The control objective of the forced-circulation evaporation process of alumina production is not only to avoid large fluctuations of the level, but also to ensure the product density to track its setpoint quickly. Due to the existence of strong coupling between the level loop and the product density loop, and high nonlinearities in the process, the conventional control strategy cannot achieve satisfactory control performance, and thus the production demand cannot bemet. In this paper, an intelligent decoupling PID controller including conventional PID controllers, a decoupling compensator and a neural feedforward compensator is proposed. The parameters of such controller are determined by generalized predictive control law. Real-time experiment results show that the proposed method can decouple the loops effectively and thus improve the evaporation efficiency.     

A novel thermoplastic polyurethane scaffold fabrication method based on injection foaming with water and supercritical carbon dioxide as coblowing agents

Injection foaming is an method for mass producing lightweight, foamed plastic components with excellent dimensional stability while using less material and energy. In this study, a novel injection foaming method employing supercritical CO₂ (scCO₂) and water as coblowing agents was developed to produce thermoplastic polyurethane (TPU) components with a uniform porous structure and no solid skin. Various characterization techniques were employed to investigate the cell morphology, crystallization behavior, and static and dynamic mechanical properties of solid injection molded samples, foamed samples using CO₂ or water as a single blowing agent, and foamed samples using both CO₂ and water as coblowing agents. When compared with CO₂ foamed samples, samples produced by the coblowing method exhibited much more uniform cell morphologies without a noticeable reduction in mechanical properties. Moreover, these TPU samples had almost no skin layer, which permitted the free transport of nutrients and waste throughout the samples. Such a mass‐produced, skin‐free structure is desirable in tissue engineering. In this study, the biocompatibility of the scaffolds was confirmed and the effect of these blowing agents on the TPU foaming behavior was studied. POLYM. ENG. SCI., 54:2947–2957, 2014. © 2014 Society of Plastics Engineers