金陵之星大酒店冰蓄冷空调工程简介

本文简单介绍了金陵之星大酒店冰蓄冷工程的设计和运行增况,可供同行们参考。     

解放军某医院电气设计记事

本文阐述了现代建筑电气的新特点、功能类别及典型案例-医院建筑电气的设计重点、设计思路和设计心得。     

农村工业化地区的城市更新:从破碎到整合——以佛山市南海区为例

空间破碎是农村工业化地区实施城市更新的主要制约,如何整合是重要的实践和学术课题。本文以“问题-对策”为分析框架,以佛山市南海区为例,从广度层面揭示出三类空间破碎及其对改造的约束机理和现有改造的整合特征,并通过深度的案例比较探究空间整合的关键所在。研究发现:物质和权属的空间破碎是该类地区的典型特征,改造又衍生出政策空间破碎;破碎增加交易成本,阻碍用地整合;现实中的整合改造是少数;在市场资本的驱动下,政府推动整合的效果显著。以“交易中间人”的角色统筹改造彰显出政府降低交易成本以协同市场的职能回归。     

建筑供水的节能方式探讨

建筑供水的节能包括节水与节电,文章分析建筑给水系统供水过程中水电损失的途径,在理论分析的基础上提出了节能的建议.     

输电线路周边火灾卫星遥感监测研究与应用

为避免电网跳闸停电事故的发生,提高输电线路山火监测的周期性和全面性,本文利用卫星遥感红外探测地表温度技术对福建省输电线路山火发生概率较大的重点县区开展了山火监测的应用研究,实现全天时全天候、大范围面状火点监测。利用自主构建的FAL模型以可信度≥4和输电线路2 km以内为阈值条件获得输变电周边火点,分析火点与输电线路之间的空间位置关系。结果表明,卫星遥感监测在火点发生时间的确定上与现场巡检结果相一致,位置存在一定偏差,但对于全省输电线路火灾预警提供了基础数据支撑,对于输电线路安全运行具有重要意义。     

Transport in regional science: The “death of distance” is premature

Transport costs have always been an important dimension in regional science. It is therefore remarkable that regional science and transport economics have developed in a rather unconnected way. Although being distinct, the routes of the two were parallel, and there are signs that the two fields will get closer to each other. This paper further discusses long run trends in transport costs and the potential spatial consequences. The main conclusion is that although in terms of money and time, the performance of transport has improved enormously, many economic activities have not become footloose to the extent as expressed by the notion of death of distance. One of the reasons discussed is the role of transaction costs, some being clearly related with distance.JEL Classification: R0, R4The authors thank the guest-editors and an anonymous referee for helpful comments.     

Modelling study of an upflow microbial fuel cell catalysed with anaerobic aged sludge

An electrochemical model for an upflow dual-chambered microbial fuel cell (MFC) process is proposed in this study. The model was set up on the basis of the experimental results and the analysis of biochemical and electrochemical processes in the MFC biocatalysed with anaerobic aged sludge and alternatively fuelled with a synthetic acetate-based and actual domestic wastewaters. Simulation of the process shows that the model describes the process reasonably well with correlation coefficients higher than 0.97. The analysis of model simulation illustrates how the current output depends mainly on the substrate concentration as well as other main variables. The relationship between the current output and over-voltage is revealed by the modelling study. For acetate-based wastewaters with initial chemical oxygen demand (COD) concentrations of 350, 700, 1050, and 1400 mg/L, maximum observed power densities were 290, 405, 448, and 525 mW/m² associated with maximum COD removals of 84%, 88%, 83%, and 82%, respectively.     

Phase transition in liquid Cu60Sn40 alloy

We report a liquid-liquid phase transition (LLPT) in Cu₆₀Sn₄₀ alloy suggested by the results of both the X-ray scattering experiment and viscosity measurement and verified by differential scanning calorimetry (DSC). The results show that a reversible LLPT (L(Cu₃Sn) + L(Sn)⇔L(Cu₆₀Sn₄₀)) may occur in the heating and cooling processes. The findings may throw light on the nature of liquids and enrich the knowledge of liquid state, further more be helpful to understand the melting and freezing mechanism.     

综合管廊弱电系统设计简析

为了规范和引导综合管廊弱电系统设计,通过工程实例介绍了综合管廊弱电系统各个子系统的设计要点如通信系统、控制系统、环境和设备监测系统、视频监控系统、入侵检测系统、电子巡查管理系统、火灾检测和报警系统、可燃气体探测和报警系统、防火门监控系统、语音通信系统,可作为类似工程设计参考。     

Assessment of the COVID-19 pandemic effect on regional electricity generation mix in NYISO,MISO, and PJM markets

This paper explores the impacts of the stay-at-home advisory issued in response to the COVID-19 pandemic on regional electricity generation fuel mixes for the three major RTOs: NYISO, MISO, and PJM. We find that the COVID-19 pandemic affected these regional markets differently, although one common finding is that overall electricity generation declined after the stay-at-home advisories were issued. We also empirically tested the impact of the stay-at-home advisories on electricity generation for different fuel types.