十二烷基硫酸钠改性氢氧化镁阻燃剂的实验研究

氢氧化镁具有阻燃、消烟、填充多种功能,是一种重要的无机环保型阻燃材料。实验采用十二烷基硫酸钠对氢氧化镁阻燃剂进行了湿法表面改性研究,对改性前后的氢氧化镁粉体进行了黏度、吸油值、堆积密度及红外光谱等表面物化性能表征,从而确定最佳的表面改性工艺条件。实验结果表明：对氢氧化镁的最佳改性时间为60 m in,改性温度为90℃,改性剂用量为2%。改性前后氢氧化镁粉体红外光谱图的对比分析显示氢氧化镁表面有新的化学键形成。     

倒边盖挖逆作法基坑支护结构可靠性分析

为了解决采用标准Monte Carlo法计算复杂基坑工程上常见小概率失效,导致计算效率低的问题,以南京市湖南路地下商业街工程为工程背景,首先,将随机响应面法与基坑工程三维模型相结合,求解极限功能函数的响应面方程,并用标准Monte Carlo法计算失效概率和可靠指标,探讨采用倒边盖挖逆作法作为基坑支护结构施工方法的可行性;其次,基于该响应面方程,以土体的弹性模量为随机变量参数,采用马尔可夫链蒙特卡罗子集模拟法(MCMC子集模拟法)计算基坑支护结构的失效概率,并与标准Monte Carlo法结果进行对比分析。结果表明：当支护结构最大侧移控制指标为25 mm时,计算得到的可靠指标均大于4.6,即采用倒边盖挖逆作法施工过程中基坑是安全的;10万次和50万次标准Monte Carlo法计算得到的失效概率均为零,说明对于标准Monte Carlo法,在计算小概率失效问题时10万与50万的样本量是不足的;而MCMC子集模拟法用2.98万个样本计算出的结果与标准Monte Carlo法采用100万个样本计算的结果相对误差仅为1.7%,表明MCMC子集模拟法对于小概率失效问题求解的优势。所提算法在一定...     

粗糙表面电磁散射系数数字方法分析与比较

回顾了随机粗糙表面电磁散射特性计算方法的特点,分析对比了各类积分方程法和微分方程法的核心算法,着重讨论了矩阵分裂算法的计算效率,以及时域有限差分法求解色散粗糙面宽带散射特性的有关问题,指出了粗糙表面散射系数的计算和选择方法。     

论高校资产流失与保护

企业往来款项主要存在两大问题 :帐实不符 ;帐龄超长和呆帐坏帐未作处理。其原因是 :(1企业财务部门监管不力 ;(2 企业内部的激励机制不健全 ;(3弄虚作假 ,调节利润 ,偷逃税款。     

Customer Satisfaction with Consumption Systems

ABSTRACT

Purpose: This research examines how satisfaction toward a product and its associated services offered together by a single provider jointly affects behavioral intentions toward the provider.

Design/methodology/approach: In this study, empirical tests were conducted using longitudinal data spanning 5 years from a multinational company that offers both products and associated services as part of a consumption system to their customers.

Findings: Results show a joint congruent effect of product and services satisfaction on behavioral intentions is linear and positive. It appears that offering great service cannot compensate for less-than-adequate satisfaction toward the product. The results further highlight decreasing customer sensitivity to improvements in both sources of satisfaction and imply that focusing on too high levels of one type of satisfaction for their customers can actually be counterproductive for firms.

Research Limitations: Our model was tested using the data obtained from a single firm. Future research could test this model with data from multiple firms in various different industries and establish broader generalizability to the findings.

Practical Implications: Findings provide managers with insights on how to allocate resources across product and service spaces and to manage product and services revenues over time. Results also indicate that customer behavioral intention ratings are more weighted on product quality over the service received by them. However, mere improvements in the product cannot provide the highest desired results and therefore quality improvements in the product need to be complemented by improvements in service quality.

Originality/Value: There is a rapid emergence of the phenomenon of manufacturers providing both products and services as an integrated consumption system to their customers. While the provision of both product and service subsystems by the same firm leads to certain synergies, there are obvious costs to the development of new service capabilities and coordination with existing product capabilities. Our research intends to address this issue.     

Nonlinear trend stationarity in global and hemispheric temperatures

This study investigates the issue of whether our Earth’s surface temperature exhibits a stochastic trend. Using state-of-the-art econometrics, we analyse the latest available temperature anomaly data. Our results indicate that both global and hemispheric temperatures may appear to have a stochastic trend when in fact they are stationary around a nonlinear deterministic trend and structural breaks are responsible. Furthermore, the nonlinearity found in the temperature trend is more complex than what has been reported in previous studies.     

面向安全通信的智能反射面网络能效优化算法

为了提高智能反射面网络传输安全性和能效，提出了一种面向安全通信的智能反射面网络能效最大资源分配算法。针对多输入单输出的智能反射面辅助蜂窝通信系统，考虑用户的安全速率约束、基站的最大发射功率约束以及连续相移约束，建立了非线性、多变量耦合的能效最大化资源分配模型。利用Dinkelbach方法将目标函数转化为辅助变量相减的形式，采用交替迭代算法求解原变量耦合的非凸优化问题。仿真结果表明，所提算法与传统算法对比，能效提升了8.3%，中断概率下降了77%。     

城市人居光环境与光污染防治——基于建筑表皮技术的城市光污染防治

通过对造成城市光污染成因的分析,阐明了当前城市人居光环境状况以及"光环境影响评价"的缺失对光污染防治工作的影响,特别是针对建筑玻璃幕墙的光污染问题,提出了基于建筑表面技术的城市光污染防治措施。认为在人居光环境问题日益严重的今天,除了从技术角度探讨光污染的防治问题外,还应从行政的层面完善相应的法律法规,尤其要加大"光环境影响评价"的力度,从根本上消除光污染的产生。     

关于电磁场边界条件的另一种合适推求

本文在两个层次上(首先,在一般小直圆柱状盒子面或小长方形回路上,其次,在任意形状小闭合面或小闭合回路上),摒弃不必要的假设,充分利用各个相应矢量在微元范围内为一恒矢量这一特点,从而,合乎逻辑地推得电磁场边界条件。     

表面探伤在起重机械中的应用

基于起重机械表面缺陷类型,结合表面探伤检测时机的分析,探讨表面缺陷检测方法,旨在提高起重机械钢结构的质量,消除安全隐患。