模拟乘法器MC1496的应用研究

模拟乘法器是一种完成两个模拟信号相乘的电子器件。本文基于电路设计与仿真软件Multisim进行模拟乘法器MC1496的应用研究,具体实现普通调幅（AM）、双边带调幅（DSB）、同步检波器、混频器的电路设计与仿真。     

不同硅铝比SAPO-44分子筛合成及甲醇制烯烃催化性能研究

以环己胺为模板剂,合成了不同硅铝比的SAPO-44分子筛,分别采用XRD、SEM、NH3-TPD等表征手段对所合成的样品进行了表征,并在固定床上考察了样品的甲醇制烯烃催化性能。结果表明,随着硅铝比的增加,样品的相对结晶度有所增加,表面酸性有增强的趋势,分子筛晶体出现一些非立方晶体物种;同时,初始烯烃选择性随着硅铝比的增加而降低,反应产物中的丙烯/乙烯质量比则呈现升高的趋势。     

Entrepreneurial quality and regional development: Characterizing SME sectors in low income areas*

This paper analyses the characteristics of SMEs in less‐developed areas in comparison with more advanced economies. The conceptual framework includes different factors making up the so‐called ‘entrepreneurial quality’ of the SME sector: the personal characteristics of the entrepreneurs (motivations and previous experience), different dimensions of the SMEs’ entrepreneurial orientation, and the patterns of the SMEs’ insertion in national and global value chains. The empirical analysis uses data of SMEs in four different Spanish provinces representing examples of low income economies and comparatively high income ones, respectively. Results show the SMEs in the low income economies to be characterized by a lower entrepreneurial quality.     

SAPO-34分子筛粒径的控制方法

SAPO-34分子筛具有独特的骨架结构,应用于甲醇制低碳烯烃反应时速率较快且不易堵塞。小晶粒SAPO-34分子筛可有效缓解产物聚合结焦,提高催化剂寿命,但通过简单的合成方法得到粒径小于100 nm的SAPO-34纳米颗粒非常困难。综述影响SAPO-34分子筛粒径的因素,通过选择合适的材料,老化和结晶条件,达到有效控制SAPO-34分子筛粒径的目的。以拟薄水铝石为铝源,液态硅为硅源,采用在水热体系中溶解度较高的四乙基氢氧化铵为模板剂,通过适当延长陈化时间和缩短晶化时间,较容易得到粒径较小的SAPO-34分子筛。     

再生时间对甲醇制烯烃催化剂水蒸气再生过程的影响

对甲醇制烯烃（MTO）过程失活催化剂采用水蒸气再生不仅可以减少二氧化碳排放,而且能提高低碳烯烃选择性,具有很好的应用前景。本文针对工业MTO过程使用的SAPO-34分子筛催化剂,研究了再生时间对水蒸气再生过程的影响。采用XRD、NH₃-TPD、TGA、FTIR、GC-MS以及N₂物理吸脱附表征手段对再生催化剂样品的晶体结构、酸性、残炭性质以及结构参数进行了表征,并考察再生催化剂的MTO反应性能。结果表明,再生时间越长,再生催化剂上残炭量越低,其酸性、比表面积和孔结构等能较好地恢复,在MTO反应中表现出更长的催化寿命。在再生过程中,催化剂上的残炭物种由芘、菲等大分子量的有机物转变为对MTO具有反应活性的萘等小分子有机物;但是可溶性残炭物种随着再生时间的延长而减少,从而使得初始低碳烯烃选择性有所降低。     

InTouch7.11在静电除尘自动控制系统中的应用

根据静电除尘的基本原理,提出了应用InTouch7．11软件设计静电除尘自动控制系统的方法,详细介绍了系统的设计,InTouch7．11通信的原理及配置,实现了控制、维护、与技术管理的集成。     

华东电网有限公司"十五"重点技术创新和"十一五"科技规划综述

在电网安全经济运行、电网技术装备水平、区域电力市场建设和运营、信息技术及其应用和管理软科学等方面全面介绍了"十五"期间华东电网所取得的主要科技成果,具体给出了2001～2005年华东电网公司共获得省部及科技进步奖30项、发明查利申请和授权6项、实用新型去利和软件看作权申请和授权22项.从电网规划和建设、电网安全优质经济运行、电网设备改造和技术升级,电网自动化和控制、区域电力市场建设到电力环保和电网安全管理等方面全面论述了华东电网有限公司"十一五"科技规划.     

C7620-11半自动车床改进

通过对C7620-11夹盘多刀半自动车床的改进,扩大了加工种类,提高了自动化程度,使其成为一台简易型数控车床。     

IL-6 Cytokine Family: A Putative Target for Breast Cancer Prevention and Treatment

The IL-6 cytokine family is a group of signaling molecules with wide expression and function across vertebrates. Each member of the family signals by binding to its specific receptor and at least one molecule of gp130, which is the common transmembrane receptor subunit for the whole group. Signal transduction upon stimulation of the receptor complex results in the activation of multiple downstream cascades, among which, in mammary cells, the JAK-STAT3 pathway plays a central role. In this review, we summarize the role of the IL-6 cytokine family—specifically IL-6 itself, LIF, OSM, and IL-11—as relevant players during breast cancer progression. We have compiled evidence indicating that this group of soluble factors may be used for early and more precise breast cancer diagnosis and to design targeted therapy to treat or even prevent metastasis development, particularly to the bone. Expression profiles and possible therapeutic use of their specific receptors in the different breast cancer subtypes are also described. In addition, participation of these cytokines in pathologies of the breast linked to lactation and involution of the gland, as post-partum breast cancer and mastitis, is discussed.     

Co64Fe11Nb5Si12B8合金磁导率与温度的关系

采用铁芯测试仪测得合金样品的初始磁导率随温度的变化曲线, 用磁化强度小角旋转法测量非晶及晶化合金条带的饱和磁致伸缩系数λs;研究了不同温度退火后Co64Fe11Nb5Si12B8合金的磁导率随温度的变化、磁性以及磁致伸缩系数;结果表明:合金在580、590℃热处理磁性变好的反常现象是由于磁致伸缩系数变小所致.