Wang W.,North China Electrical Power University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014
In this paper we investigate the parallel texture structures with cofactor zeros in the charged lepton and neutrino sectors. The textures cannot be obtained from arbitrary leptonic matrices by making weak basis transformations, which therefore have physical meaning. The 15 parallel textures are grouped as 4 classes where each class has the same physical implications. It is founded that one of them is not phenomenologically viable and another is equivalent to the texture zero structures extensively explored in previous literature. Thus we focus on the other two classes of parallel texture structures and study the their phenomenological implications. The constraints on the physical variables are obtained for each class, which is essential for the model selection and can be measured by future experiments. The model realization is illustrated in a radiated lepton mass model. © 2014. Source
Zuo J.,University of South Australia |
Zhao Z.-Y.,North China Electrical Power University
Renewable and Sustainable Energy Reviews | Year: 2014
Green building is one of measures been put forward to mitigate significant impacts of the building stock on the environment, society and economy. However, there is lack of a systematic review of this large number of studies that is critical for the future endeavor. The last decades have witnessed rapid growing number of studies on green building. This paper reports a critical review of the existing body of knowledge of researches related to green building. The common research themes and methodology were identified. These common themes are the definition and scope of green building; quantification of benefits of green buildings compared to conventional buildings; and various approaches to achieve green buildings. It is found that the existing studies played predominately focus on the environmental aspect of green building. Other dimensions of sustainability of green building, especially the social sustainability is largely overlooked. Future research opportunities were identified such as effects of climatic conditions on the effectiveness of green building assessment tools, validation of real performance of green buildings, unique demands of specific population, and future proofing. © 2013 Published by Elsevier Ltd. Source
Tan W.,North China Electrical Power University
IEEE Transactions on Power Systems | Year: 2010
A unified PID tuning method for load frequency control (LFC) of power systems is discussed in this paper. The tuning method is based on the two-degree-of-freedom (TDF) internal model control (IMC) design method and a PID approximation procedure. The time-domain performance and robustness of the resulting PID controller is related to two tuning parameters, and robust tuning of the two parameters is discussed. The method is applicable to power systems with non-reheated, reheated, and hydro turbines. Simulation results show that it can indeed improve the damping of the power systems. It is shown that the method can also be used in decentralized PID tuning for multi-area power systems. © 2009 IEEE. Source
North China Electrical Power University | Date: 2013-03-08
A compressed air energy storage system comprises a high-pressure water apparatus, a low-pressure water apparatus coupled to the high-pressure water apparatus through two channels, wherein a first channel is formed by a pumped hydroelectric power generation unit, a first high-pressure pipe and a first low-pressure pipe and a second channel is formed by a gas-water energy exchange unit, a second high-pressure pipe and a second low-pressure pipe and a compressed gas storage unit coupled to the gas-water energy exchange unit.
North China Electrical Power University | Date: 2014-04-14
This invention relates to environment protection, and discloses apparatus and method for electrokinetic in-situ leaching remediation of contaminated soil. The apparatus includes a DC electrical source, electrode chambers, electrodes, permeable reactive barriers (PRBs), electrode solution pH testers, electrode solution extraction tubes, a heating pipe network, a heat exchanger, leacheate sprayers, acid-base adjusting solution sprayers, a multichannel peristaltic pump, automatic control devices, an electrode solution storage tank, an electrode solution treatment pond, an in-line pump, single-channel peristaltic pumps, a flowmeter, a time control device, a leacheate storage tank, an acid solution storage tank, an alkali solution storage tank, and soil pH testers. Through electrokinetic enhanced leaching, heating pipe network and PRBs to optimize remediation and accelerate remediation rate, and automatic control devices and recycling of electrode solution to elevate the automation level and increase resource recycling rate, a faster and better remediation at a lower cost can be achieved.