Zhang D.,Jilin Electric Power Research Institute |
Tian G.,Jilin University
Saudi Journal of Biological Sciences | Year: 2017
Stress can be either positive or negative to human beings. Under stressful conditions, the mental and physical conditions of human can be affected. There exists certain relation between stress and illness. The cortisol and other glucocorticoids bind to the same receptor, which is called glucocorticoid receptor. Some evidences indicated that cortisol molecule binding to its glucocorticoid receptor was necessary for the stress response. Up to now, the structure–function relationships between cortisol molecule and its glucocorticoid receptor have not been deliberated from the atomic-level. In order to get a detailed understanding of the structure–function relationships between the cortisol molecule and glucocorticoids receptor, we have carried out molecular dynamic (MD) simulations on glucocorticoid receptor (Apo system) and cortisol with its glucocorticoid receptor complex (HCY system). On the basis of molecular dynamic simulations, a couple of key residues were identified, which were crucial for the binding of cortisol molecule. The results of binding free energy calculations are in good agreement with the experiment data. Our research gives clear insights from atomic-level into the structural–functional aspects of cortisol molecule and its glucocorticoid receptor, and also provides valuable information for the design of drug which can treat stress related illnesses. © 2017
Chu Z.,Northeast Dianli University |
Dou X.,Northeast Dianli University |
Yu Q.,Jilin Electric Power Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2017
Distribution network reconfiguration is an important measure for optimal operation of distribution network. Because of its clean and renewable distributed generation, it is more and more introduced to distribution network reconfiguration. In view of the output random DG's influence on the distribution network reconfiguration, the scene division method based on wasserstein distance index is introduced into the distribution network reconfiguration and the wind power is divided into a number of scenes. Considering the randomness of wind power and load fluctuations, this paper puts forward the optimal scheme to determine strategy based on binary particle swarm optimization algorithm and establishes the model of distribution network reconfiguration. A loop coding and initial population generation strategy is put forward based on the rule "out the same and reserve the different", the computation efficiency is improved. The established model is solved in the IEEE33 node distribution network system. The feasibility and effectiveness of the proposed strategy are verified and an optimal reconstruction scheme is obtained, which is adapted to the randomness of wind power and the load fluctuation. © 2017 Power System Protection and Control Press.
Sun Y.,Jilin University of Finance and Economics |
Dong J.,Jilin Electric Power Research Institute |
Ding L.,Jilin Electric Power Research Institute
Energy Conversion and Management | Year: 2017
The increasing penetration of intermittent wind power affects the secure operation of power systems and leads to a requirement of robust and economic generation scheduling. This paper presents an optimal day–ahead wind–thermal generation scheduling method that considers the statistical and predicted features of wind speeds. In this method, the statistical analysis of historical wind data, which represents the local wind regime, is first implemented. Then, according to the statistical results and the predicted wind power, the spinning reserve requirements for the scheduling period are calculated. Based on the calculated spinning reserve requirements, the wind–thermal generation scheduling is finally conducted. To validate the program, a verified study is performed on a test system. Then, numerical studies to demonstrate the effectiveness of the proposed method are conducted. © 2017 Elsevier Ltd
Liu P.S.,Beijing Normal University |
Du H.Y.,Beijing Normal University |
Du H.Y.,Jilin Electric Power Research Institute
Materials and Design | Year: 2011
Three dimensional reticulated porous metal foams are widely used engineering materials. A failure model with the simplified structure of these porous materials has been established, and the failure modes have been analyzed for the corresponding porous components under several typical loads, which include torsion, shearing and bending. The failure modes cover the tensile fracture, the shearing and the buckling of the strut, which may lead to the final destruction of the whole porous structure. The mathematical relationships, which characterize different failure modes, have been derived for the strut failure resulting from loading for these porous components under the above loading conditions. The results also show that the failure mode is related with the material species for these materials under the above loads. The tensile fracture of the strut will occur for the porous body with metallic materials in most cases, and the shearing fracture of the strut may occur for that in a relatively little cases. Moreover, the elastic buckling, the elastic-plastic buckling and the edge yielding may also occur on the strut of porous bodies when certain conditions are met. © 2011.
Lin H.,Jilin Electric Power Research Institute |
Sun W.,Jilin University |
Zhao C.,Jilin University |
Na H.,Jilin University
Journal of Polymer Research | Year: 2013
Membranes of sulfonated poly (arylene ether ketone) containing carboxyl groups (SPAEK-C) are modified by alternating deposition of oppositely charged polyelectrolytes [carboxyl-functionalized multiwalled carbon nanotubes (C-MWCNTs) and chitosan (CS)] in order to reduce methanol crossover and maintain high proton conductivity in a direct methanol fuel cell (DMFC). Fourier transform infrared spectroscopy confirms that C-MWCNTs and CS are assembled in the multilayers. The morphology of membranes is studied by scanning electron microscopy. The results confirm the presence of thin C-MWCNTs/CS multilayers coated on the SPAEK-C membrane. The SPAEK-C-(C-MWCNTs/CS)n membranes maintain high proton conductivity values up to 0.058 Scm-1 at 25 °C and 0.24 Scm-1 at 80 °C, which are superior to previous layer-by-layer assembled polyelectrolyte systems. Meanwhile, the methanol permeability of these modified membranes is effectively reduced. The selectivity of SPAEK-C-(C-MWCNTs/CS)n is two orders of magnitude greater than that of Nafion® 117, making these modified membranes a good alternative to be used in DMFCs. The thermal stability, water uptake, swelling ratio and proton conductivity of SPAEK-C and SPAEK-C-(C-MWCNTs/CS)n membranes are also investigated. © Springer Science+Business Media 2013.
Xu X.,Jilin Electric Power Research Institute |
Chen H.-L.,Wenzhou University
Soft Computing | Year: 2014
Bacterial foraging optimization (BFO) is predominately used to find solutions for real-world problems. One of the major characteristics of BFO is the chemotactic movement of a virtual bacterium that models a trial solution of the problems. It is pointed out that the chemotaxis employed by classical BFO usually results in sustained oscillation, especially on rough fitness landscapes, when a bacterium cell is close to the optima. In this paper we propose a novel adaptive computational chemotaxis based on the concept of field, in order to accelerate the convergence speed of the group of bacteria near the tolerance. Firstly, a simple scheme is designed for adapting the chemotactic step size of each field. Then, the scheme chooses the fields which perform better to boost further the convergence speed. Empirical simulations over several numerical benchmarks demonstrate that BFO with adaptive chemotactic operators based on field has better convergence behavior, as compared against other meta-heuristic algorithms. © 2013 Springer-Verlag Berlin Heidelberg.
Jilin Electric Power Research Institute and State Grid Corporation of China | Date: 2013-08-02
0.2Ss class special-type high-voltage measuring current transformer belongs to a field of current transformer. An iron core includes two kinds of L-shaped sheets with the same size, wherein a ratio of a long side to a short side of each L-shaped sheet is 3:2; a first kind of the L-shaped sheets are permalloy sheets (1) and a second kind of the L-shaped sheets are cold rolled silicon steel sheets (2); and required windings are wound on each side of the iron core. Sheets of the iron core of the current transformer include the permalloy sheets and the cold rolled silicon steel sheets, which improves performance of the iron core. Utilizing structural characteristics of the iron core of different materials, a fractional turn compensation of coils is formed, which realizes a precise measurement.
Zhang R.,Jilin Electric Power Research Institute |
Wu C.,Northeast Dianli University
Lecture Notes in Electrical Engineering | Year: 2016
A vast number of cracks have appeared at the exit of the boiler vertical water wall, which causes the boiler outage during the 350 MW supercritical unit. To solve this problem, we analyze the characteristics of cracks and boiler-related operating curve is in operation. The study found that the main factor leading to the cracks at the exit of the boiler vertical water wall is thermal stress resulted from large-scale temperature deviations between pipes and rapid changes in pipe temperature. The thermal stress generally emerged under the low-load condition after the boiler turns to dry state. In addition, there is a correspondence between vertical water wall tube temperature fluctuations and changes in boiler feed water. We made the three following recommendations for the causes and characteristics of cracks at the exit of boiler vertical water wall. First, it is to minimize this type of boiler long-term low-load operation in the dry state. Second, the operating personnel shall monitor the vertical water wall outlet temperature under the low-load after the boiler turns to dry state. Finally, we increase the adjustment ability of automatic water supply and automatic coal supply to coal–water ratio. © Springer-Verlag Berlin Heidelberg 2016.
Chen T.,Jilin Electric Power Research Institute
Chinese Journal of Endemiology | Year: 2014
Objective To compare the effectiveness of two kinds of defluorinating agents (bone char and modified clay) for removal of fluoride in drinking water, and to analyze their application feasibility in small towns. Methods Influencing factors on defluorinating efficiencies of the two kinds of defluorinating agents under the same conditions were studied, namely the effects of adsorption time, temperature, pH, common anions and cations, and solid-liquid ratio on defluorinating efficiencies were studied. The defluorinating efficiencies of the two kinds of defluorinating agents were validated by original groundwater in Jilin Province. The homemade bone char defluorinating agent and modified clay defluorinating agent were regenerated by NaOH and Al2(SO 4)3, respectively, and their regeneration abilities were investigated. Results The adsorption data of the two kinds of defluorinating agents were fitted Langmuir model well, and the maximum adsorption capacities were 10.225 g/kg(bone char) and 0.587 g/kg (modified clay). The effect of temperature on defluorinating efficiencies was limited, with increasing temperature( 10 - 35 °C ), the adsorption capacity of bone char and modified clay for fluoride ranged from 1.568 g/kg to 1.598 g/kg and 0.423 g/kg to 0.470 g/kg, respectively. Fluoride could be easily removed under low pH conditions, with increasing of pH(4 - 10), the adsorption capacity of bone char and modified clay for fluoride decreased from 1.598 g/kg to 1.523 g/kg and 0.724 g/kg to 0.320 g/kg, respectively. The defluorinating efficiencies were improved by common cations(Ca2+) in groundwater, and the adsorption capacity of bone char and modified clay for fluoride increased to 1.713 g/kg and 0.485 g/kg, respectively. Whereas, the defluorinating efficiencies were inhibited by common anions(HCO3 -, SO4 2-) at a certain degree, and the adsorption capacities of bone char and modified clay for fluoride were decreased to 1.158 g/kg(HCO3 -) and 0.237 g/kg(SO4 2-), respectively. Defluoridation bone char could be regenerated by soaking in NaOH, and modified clay by immersion in Al 2(SO4)3. The adsorption capacities of the two defluorinating agents that had been regenerated for three times still reached 94.6% and 97.3% of their original capacities. Conclusions Both of the homemade bone char defluorinating agent and modified clay defluorinating agent have good defluorinating efficiencies and can be regenerated for many times, which are perfectly suitable for application in small towns since they are simple and can be easily applied. The homemade bone char defluorinating agent is suitable for family drinking water and the homemade modified clay defluorinating agent would be more suitable for centralized drinking water.
Bi Z.,Jilin Electric Power Research Institute |
Gao C.,Jilin Electric Power Research Institute
Proceedings of the 5th IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies, DRPT 2015 | Year: 2015
The large-scale integration of wind power plays an increasingly important role in power systems. Accurate and effective modeling and simulation methods of wind power are urgently demanded. This paper studies the actual wind power generation over time, and proposes an electromagnetic transient model of wind power generation. Also, the hybrid transient (electromagnetic transient and electromechanical transient) programs are implemented with the consideration of the electromagnetic networks of wind-farm sides and electromechanical networks of Jilin-Grid sides, respectively. The proposed wind power generation model is verified through real measurement data. The proposed work is promising for the electromagnetic transient wind power integration research. © 2015 IEEE.