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...     

基于响应面法的换流变压器励磁涌流峰值快速计算分析

为解决传统数值法和软件仿真法求解变压器励磁涌流存在模型参数固定、效率低下等问题,提出将响应面拟合计算方法运用在换流变励磁涌流的计算中,实现考虑到主心柱在不同剩磁的条件下的励磁涌流峰值随合闸角变化的高效计算分析。理论分析变压器励磁涌流的产生机理,提取出关键影响因素,采用参数建模建立换流变压器模型,通过响应面试验设计拟合绕组初始电流、合闸角和励磁涌流峰值之间的响应面模型,并验证响应面的精度。研究成果可为变压器励磁涌流快速计算分析、电力变压器数字孪生技术提供技术参考。     

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.     

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%。     

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.     

员工-配偶工作家庭边界分割偏好匹配对员工工作投入的影响机制研究

依据个体-环境匹配理论和平衡理论，基于320份员工与配偶的配对问卷调查数据，采用多元回归分析、响应面分析以及块变量分析方法，探讨了员工-配偶工作家庭边界分割偏好不同匹配/不匹配类型对员工工作投入及情感平衡的影响。结果表明：员工-配偶工作家庭边界分割偏好匹配有利于提高员工的情感平衡和工作投入水平；而员工-配偶工作家庭边界分割偏好不匹配则会降低员工的情感平衡和工作投入水平。具体而言，当员工-配偶工作家庭边界分割偏好匹配时，员工边界分割偏好高-配偶边界分割偏好高对员工情感平衡和工作投入的正向影响更强；当员工-配偶工作家庭边界分割偏好不匹配时，员工边界分割偏好低-配偶边界分割偏好高对员工情感平衡和工作投入的负向影响更强。无论员工-配偶工作家庭边界分割偏好是否匹配，情感平衡均在其对员工工作投入的影响中起中介作用。     

An examination of the congruence and incongruence between employee actual and customer perceived emotional labor

This study examines the effects of the congruence and incongruence between employee actual and customer perceived emotional labor on customer trust. Based on data collected from 510 service employee and customer dyads in restaurants, the results of response surface modeling indicate that customer trust is higher when employee deep acting and customer perceived deep acting are both high rather than both low. Customer trust is also higher when customer perceived deep acting is higher than employee actual deep acting rather than vice versa. The effects are different in surface acting: as employee surface acting and customer perceived surface acting increase, customer trust initially decreases, then increases, exhibiting a U‐shaped effect. Implications for both theory and practice are discussed.     

行星表面有人探索高速无线网络体系架构及关键技术

针对行星表面有人探索任务对高速无线通信的需求，提出了一种基于异构组网思想的网络体系架构，并对关键技术进行了分析和设计。该架构采用“三网两体制”的设计思路，将整个网络分为高速传输网、多媒体接入网、覆盖扩展网三个组成部分，三层网络分别完成高速骨干传输、多节点多业务接入、覆盖范围灵活改变的功能。根据三个网络不同的节点处理能力和传输需要，设计了高速传输体制、灵活接入体制两种传输体制，及基于无线多跳的覆盖扩展技术、多子网通信切换技术、多体制融合技术等关键技术。该网络架构具有裁剪灵活、协议开销小、支持业务类型多等特点。     

丙二醇单月桂酸酯的增稠性能

丙二醇单月桂酸酯(简称PGM)是一种亲酯性非离子型表面活性剂。通过对PGM在洗涤剂和化妆品的增稠性能研究发现,PGM在甜菜碱和硫酸酯盐表面活性剂体系的洗涤剂中有良好的增稠性能,并且其增稠性能在相同条件下要好于椰子油脂肪酸单乙醇酰胺(CME)增稠剂。在甜菜碱表面活性剂体系和硫酸酯盐表面活性剂体系的洗涤剂中PGM具有良好起泡性能。在甜菜碱、AES-Na和AES-TEA表面活性剂体系的洗涤剂中PGM在低温条件下,体系稳定不会变浑浊。PGM在洁肤类、液洗类和护肤类化妆品中也有良好的增稠性能。     

试论“私募基金”在我国的发展

私募基金作为一种投资工具在我国还尚未正式出现 ,而是以各种形式存在于地下。必须对私募基金进行常识性的介绍、分类和比较 ,才能看出私募基金的规范和健康发展对我国经纪业、证券业、资本市场乃至整个国民经济产业结构具有深远影响。并且显示出私募基金的存在是资本增殖内在要求这一主题。可以说私募基金的发展具有历史必然性和现实迫切性