基于扎根理论的商业综合体导识系统满意度影响因素研究

导识系统是在用户缺乏方向感时,向用户传递信息,指引用户的重要手段,同时 也是展现城市文化的有效途径。一套优秀的导识系统能快速便捷地引导用户到达目的地,如何 改善导识系统以便更好地服务于用户对提高导识系统服务质量、提升用户满意度具有重要意义。 针对35 名用户进行半结构化访谈,在收集大量访谈资料的基础上,利用质性研究方法扎根理论 对访谈资料进行分析和归纳,提炼出用户对于商业综合体导识系统满意度的影响因素。最终归 纳出5 个主范畴,即可读性、可达性、安全性、交互性和友好性,以此为依据建构影响因素与 作用路径理论模型,进一步运用结构方程模型对其进行验证分析,验证了该模型的合理性和科 学性。研究结果对提高用户对导识系统的满意度具有积极的实践价值,帮助设计人员从用户视 角深化导识系统服务的未来构建方向,并为地产运营商在资源组织和服务更新上提出一定借鉴。     

Compound control for speed and tension multivariable coupling system of reversible cold strip mill

To weaken the nonlinear coupling influence among the variables in the speed and tension system of reversible cold strip mill, a compound control (CC) strategy based on invariance principle was proposed...     

双边摩擦接触力学问题和第二类混合变分不等式的等价性及其数值近似

摩擦接触问题的数学模型是一个变分不等式,一般的变分不等式对应力,表面力及位移是利用应力-应变关系,应变-位移关系逐个进行求解,而混合变分不等形式则可同时求解应力和位移,这是混合变分不等式的优点.王烈衡曾以混合变分形式为基础,利用有限元法求解无摩擦弹性力学问题.本文以弹性力学问题中的双边摩擦接触问题为背景,讨论了第二类混合变分不等形式和能量泛函的极小值问题,并对它们的等价性进行了研究,接着用有限元法求双边摩擦的弹性接触问题以及近似解的误差估计.     

Experimental research in leaching of copper-bearing tailings enhanced by ultrasonic treatment

On the basis of an experiment in ultrasonic enhanced ammonia leaching of tailings, the effect of ultrasonic waves on copper dissolution was studied. The mechanism of ultrasonic enhanced tailing leaching was analyzed and a technique of ultrasonic enhanced pipe leaching of tailings was proposed. The results show that tailings with ultrasonic treatment can leach up to 89.5% of Cu, which is 13.5% more than those without the treatment. Ultrasonic technology is capable of improving leaching rates and the overall recovery of tailing leaching. Impact waves and micro jet streams can strip and erode affected surfaces of tailing particles to create new active surfaces and disturbances can intensify mass transfer processes in "dead zones". The technique of ultrasonic enhanced pipe leaching of tailings is a combination of existing agitation enhancement with ultrasonic enhancement and can im-prove mineral recovery.     

嵌入式控制系统在CPT系统中的应用

对非接触式电能传输系统（简称CPT系统）的总体设计、功能设计和决策控制层硬件架构设计进行了介绍．提出了一种在CPT系统中应用ARM作为决策层,利用DSP实现实时控制的体系架构．在此基础上建立起硬件架构,并给出了系统的程序流程．     

Schllkopf手性试剂的合成工艺研究

介绍了Schllkopf手性试剂的合成工艺,以D-缬氨酸为原料,经保护,氯甲酸叔丁酯活化后,与甘氨酸甲酯盐酸盐反应得甲基-N-（叔丁氧基羰基）-D-缬氨酸甘氨酯;酯加热成环后,与三甲氧嗡四氟化硼盐反应得Schllkopf醚,总收率为51.8%。     

Design of 1 kbit antifuse one time programmable memory IP using dual program voltage

A 1 kbit antifuse one time programmable (OTP) memory IP, which is one of the non-volatile memory IPs, was designed and used for power management integrated circuits (ICs). A conventional antifuse OTP cell using a single positive program voltage (V _PP) has a problem when applying a higher voltage than the breakdown voltage of the thin gate oxides and at the same time, securing the reliability of medium voltage (V _M) devices that are thick gate transistors. A new antifuse OTP cell using a dual program voltage was proposed to prevent the possibility for failures in a qualification test or the yield drop. For the newly proposed cell, a stable sensing is secured from the post-program resistances of several ten thousand ohms or below due to the voltage higher than the hard breakdown voltage applied to the terminals of the antifuse. The layout size of the designed 1 kbit antifuse OTP memory IP with Dongbu HiTek’s 0.18 μm Bipolar-CMOS-DMOS (BCD) process is 567.9 μm×205.135 μm and the post-program resistance of an antifuse is predicted to be several ten thousand ohms.     

奥氏体不锈钢NaOH介质下的失效机理

本文通过对电化学腐蚀的机理的研究以及奥氏体不锈钢腐蚀破坏的金相分析,证明了奥氏体不锈钢与NaOH介质的不相容性。为压力容器制造企业的选材和制造过程提供了较为完整的预防措施,从而保证压力容器的安全使用。     

基于可区分语言模型的微博在线话题检测

针对微博话题检测中需要解决的高维数据、噪声信息以及话题的快速演化等主要问题,提出一个有效的微博在线话题检测模型——可区分语言模型(discriminative language model,DLM).该模型首先选择微博数据的可区分特征子空间,接着利用一元语言模型实现微博话题的在线检测.实验表明,在MACRO_F1和AVG_CDET等指标上,DLM明显优于现有模型,DLM能准确及时发现微博话题.     

斜角蒸镀光学薄膜工艺的研究

斜角蒸镀方法是制备光学薄膜的常用方法之一.试验证明,采用斜角蒸镀方法沉积薄膜,能改变薄膜晶体结构,从而使薄膜性能得到改变.在蒸发过程中,蒸发材料在基底上形成了倾斜的柱状结构薄膜,而且随着蒸镀过程入射角度的增加,薄膜柱状结构也发生了明显改变,本文结合试验结果对这些影响因素加以分析.通过控制薄膜生长的条件,包括沉积的材料和其它条件,能够将薄膜结构控制精确到10nm级别.在薄膜生长过称中,动量守恒和表面扩散作用是形成这种独特的柱状结构的主要原因.因此,如果能够采用工艺手段改变材料的结构来改变它的折射率,就能使光学薄膜的选材更加广泛,也能扩大光学薄膜应用范围.