中水源热泵地板供暖运行策略分析

为研究中水源热泵地板供暖系统的节能策略,以石家庄市某实际运行小区的中水源热泵地板辐射供暖系统为对象,引入室外综合温度的概念,综合考虑室外气温、太阳辐射热与风速等环境因子的影响,推导得出了地板辐射供暖系统质调节情况下,保证热用户舒适度的二次网供、回水温度调节公式。经实际运行测试,由该调节公式计算得出的二次网供、回水温度作为地板辐射供暖系统分时段质调节的依据,可以在满足热用户舒适度要求的情况下,取得良好的节能效果。中水源热泵系统与地板辐射供暖系统的结合及推广为城市集中供热提供了新思路。     

广义基本解方法求解具有一类特殊热源的热传导方程反边界值问题

给出一种求解具有一类特殊热源的非齐次热传导方程反边界值问题的无网格方法,即广义基本解方法．该方法将问题的解分成特解和相应齐次问题的解两个部分：齐次解用基本解方法求解,而特解则是利用源项的特殊性由相应的特征方程的基本解近似得到．最后给出数值例子说明该方法的稳定性和有效性．     

虚拟经济的本质及影响实体经济的机理

虚拟经济的本质是一种价值权利的转移,它脱离了实体经济的具体生产过程,利用人们心理预期变化所造成的短期市场价格波动来赚取价差收益.在虚拟经济交易过程中,价值权利所代表的实物资本的物量和用途并未发生变化,也没有创造出新增价值,而只是实现了交易各方的货币收入再分配.虚拟经济对实体经济产生影响的关键性因素是虚拟经济的市场流动性,只有保持虚拟经济的适度流动性,才能真正起到改善实体经济融资环境、优化资源配置和产业结构的功能.实现虚拟经济和实体经济的稳定协调发展.     

水泥水化热试验容易忽略的几个细节

文章探讨了溶解热法测定水泥水化热试验操作过程中容易忽略的一些细节,旨在减少试验误差,提高试验结果的准确性。     

外墙外保温贴砖施工中应注意的几个问题

建筑外墙外保温技术已被广泛应用于建筑物的施工中,目前的外墙外保温施工一般是采用在建筑物外墙涂刷涂料的方式,但涂料外墙墙面容易陈旧,并出现裂纹。为了使建筑物外墙美观效果持久,一些业主要求在建筑物外墙外保温面进行贴砖。在外保温层面再进行贴砖装饰尚属新工艺,现将施工中需要注意的问题提出与大家探讨。     

For the greater good: business networks and business social responsibility to communities

Business networks (co-operative arrangements between independent business organizations) may be the signature organizational form of the contemporary global economy. Many policy-makers and local leaders advocate business network membership as an alternative development strategy for regional economic vitality. The extant literature on business networks has focused on their association with business success. However, little is known about their impact on other aspects of community life. The purpose of this paper is to elaborate the role of network membership on one non-economic dimension of the business community interface. We examined the relationship between business network membership and business social responsibility to communities, defined as the provision of leadership and support for community betterment projects. Data were gathered from telephone interviews with a random sample of 460 non-metro small business operators in the USA. Independent t-tests and ordinary least squares regression analyses controlling for theoretically important variables were conducted. Findings show that networked businesses provide more leadership and support for their communities than non-networked businesses. However, networked businesses were no more likely than non-networked businesses to use local suppliers of goods and services.     

大体积混凝土裂缝成因分析

随着社会经济的发展,各种大型、特大型的混凝土结构物即大体积混凝土与日俱增。我国在《普通混凝土配合比设计规程》一书中,对大体积混凝土解释为"混凝土结构物中实体最小尺寸大于或等于1 m或易引起裂缝的混凝土"。文章针对大体积混凝土施工中容易出现的裂缝问题,进行了一系列的原因分析,并提出防治措施,以避免裂缝的产生。     

通信用热交换型户外机柜节能降噪设计

通信用热交换型户外机柜节能降噪设计突破常规使用的集成式热交换器的设计,以一个全新设计的机柜结构,以最简单的风机加散热风道的设计革新了热交换户外机柜的设计,在直接成本、噪音、能耗上均比集成式热交换户外机柜要好,甚至在噪音和能耗上高于风扇型户外机柜,各项性能指标均高于行标。真正达到功耗小、无污染、防护等级高。     

PRICING AND HEDGING OF DERIVATIVES BASED ON NONTRADABLE UNDERLYINGS

This paper is concerned with the study of insurance related derivatives on financial markets that are based on nontradable underlyings, but are correlated with tradable assets. We calculate exponential utility‐based indifference prices, and corresponding derivative hedges. We use the fact that they can be represented in terms of solutions of forward‐backward stochastic differential equations (FBSDE) with quadratic growth generators. We derive the Markov property of such FBSDE and generalize results on the differentiability relative to the initial value of their forward components. In this case the optimal hedge can be represented by the price gradient multiplied with the correlation coefficient. This way we obtain a generalization of the classical “delta hedge” in complete markets.     

20Kt/a煅烧焦回转窑耐高温下料溜管技术改造的研究

介绍在大港油田20Kt/a煅烧焦厂煅烧回转窑高温下料溜管的投产使用中,针对出现的焊口开裂、高温下管体变形等一系列问题,通过焊接应力分析、高温温差应力、溜管整体结构受力分析等方法和原理,从整体结构和焊接方法两方面进行技术改造,探讨出符合大港油田20Kt/a煅烧焦60米回转窑使用要求的耐高温下料溜管制作安装方法。