EDLC charging performance for microgrid applications

In order to review storage performance of the electric double layer capacitor （EDLC） in microgrid applications, charging time and storage efficiency issues are mainly studied aiming at three different charging modes, including the constant voltage charging mode （CVCM）, the constant current charging mode （CCCM） and the constant power charging mode （CPCM）, based on the practical EDLC product. Numerical calculation methods are presented for different charging modes, and the charging efficiency is also reviewed with strict mathematical deductions, which is validated to be accurate enough and applicable through a simple case with the PV/EDLC system illustration. Finally, trade-off problems between charging time and energy loss are also studied. Research results show that the CPCM is more suitable for microgrid networks compared with the traditional constant-voltage and constant-current charging modes. The hybrid charging method is recommended to save energy and keep high efficiency relatively at the same time. However, how to manage the combination percentage of different charging modes in a reasonable way should be dealt with according to the practical requirements.

某两层商业建筑节能设计的分析

该建筑物的立面外窗传热系数不满足《公共建筑节能设计标准》(GB50189-2015)等相关规范要求。须进行围护结构节能动态计算。建筑围护结构热工性能的权衡计算权衡判断设计结论合格。

议居住建筑节能设计标准的差异对节能设计的影响

节能减排是当今社会的重大议题,自2008年10月1日实施《民用建筑节能条例》以来,居住建筑节能设计取得了显著效果,大大降低了居住建筑的能耗,节约了大量能源。但在实际执行过程中,却存在对节能设计概念模糊、节能计算方法有误以及节能设计审查不严等问题。致使出现一些虽形式上满足节能设计要求,但却存在严重能耗问题的伪节能居住建筑。这些问题的存在原因很多,其中各地方节能设计标准本身对节能设计的定义描述、具体要求及评价标准的差异是重要原因之一。论文仅就此方面举例探讨其对节能设计结果的影响,以期对节能设计者提供帮助,给规范修订者提供参考。

Three-dimensional stability of landslides based on local safety factor

Unlike the limit equilibrium method(LEM), with which only the global safety factor of the landslide can be calculated, a local safety factor(LSF) method is proposed to evaluate the stability of different sections of a landslide in this paper. Based on three-dimensional(3D) numerical simulation results, the local safety factor is defined as the ratio of the shear strength of the soil at an element on the slip zone to the shear stress parallel to the sliding direction at that element. The global safety factor of the landslide is defined as the weighted average of all local safety factors based on the area of the slip surface. Some example analyses show that the results computed by the LSF method agree well with those calculated by the General Limit Equilibrium(GLE) method in two-dimensional(2D) models and the distribution of the LSF in the 3D slip zone is consistent with that indicated by the observed deformation pattern of an actual landslide in China.

Recalculating Sino-US Trade Balance Using the Ownership-Based Statistical Method

Using the trade statistical method based on asset ownership,this paper recalculated Sino-US bilateral trade volume and the result indicates that against traditional trade statistics,Chinese exports to the US reduced by an average of 51%while Chinese imports from the US increased by an average of 41%between 2004 and 2010.Balance of trade is in the range between US$2,189 billion of deficit and US$12.77 billion of surplus on the part of China,which are far smaller than the balance of Sino-US trade calculated by traditional statistical method.In order to reflect the real scale of China's foreign trade and effectively respond to Sino-US trade frictions,it is necessary for China to establish its trade statistics system based on asset ownership.

Economic Implications of CO2 Emission Reduction in Japan Applying a Dynamic CGE Model with Endogenous Technological Change： Use of Emission Permit Revenue

This study analyzes the economic and environmental impacts of a climate change measure in Japan using a single-country dynamic computable general equilibrium model with technological change as an endogenous variable. In this way, a comprehensive analysis of the relationships between climate change and its measures, technology, and economy has been done. The model uses technological change as the accumulation of knowledge capital that is derived from research and development investment. The study investigates the impacts of a climate change measure considering the use of emission permit revenue and technological change induced by the policy implementation in the Japanese economy. Simulation results show that there is compatibility between CO2 emission reduction and positive effects on GDP that depends on the ways of the revenue use and technological change induced by emission reduction. However, it is not possible to find the ways to realize positive effects on both GDP and welfare simultaneously in the study. The sensitivity analysis for the elasticity of substitution between knowledge capital and other inputs also confirms the obtained results.