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| 1 | Study of charge structure and radiation characteristic of intracloud discharge in thunderstorms of Qinghai-Tibet Plateau显示文摘The comprehensive observations on lightning discharges were conducted in Naqu area of Qinghai-Tibet Plateau in summer of 2002. The electric structures of thunderstorms and the characteristics of lightning discharges at initial stage were analyzed by using the observation data. The results show that most of intracloud (IC) lightning flashes were polarities inverted in thunderstorms with tripole electric charge structure and occurred between negative charge region located in the middle of the thunderstorm and positive charge region located at the bottom of the thunderstorm. The radiation characteristics of discharge processes in cloud with longer lasting time involved in Cloud-to-Ground (CG) lightning flashes were similar to that of IC discharges.A lot of radiation pulses were produced in these discharge processes. Because the IC discharges took place at the bottom of thundercloud and were near the ground, they may produce more serious damage to equipment on the ground therefore should not be neglected in lightning protection. | ZHAGN Yijun DONG Wansheng ZHAO Yang ZHANG Guangshu ZHANG Hongfa CHEN Chengpin ZHANG Tong | 2004 | Science China Earth Sciences2004，47，z1： | 16 |
| 2 | Data processing of small samples based on grey distance information approach显示文摘Data processing of small samples is an important and valuable research problem in the electronic equipment test. Because it is difficult and complex to determine the probability distribution of small samples, it is difficult to use the traditional probability theory to process the samples and assess the degree of uncertainty. Using the grey relational theory and the norm theory, the grey distance information approach, which is based on the grey distance information quantity of a sample and the average grey distance information quantity of the samples, is proposed in this article. The definitions of the grey distance information quantity of a sample and the average grey distance information quantity of the samples, with their characteristics and algorithms, are introduced. The correlative problems, including the algorithm of estimated value, the standard deviation, and the acceptance and rejection criteria of the samples and estimated results, are also proposed. Moreover, the information whitening ratio is introduced to select the weight algorithm and to compare the different samples. Several examples are given to demonstrate the application of the proposed approach. The examples show that the proposed approach, which has no demand for the probability distribution of small samples, is feasible and effective. | Ke Hongfa, Chen Yongguang & Liu Yi 1. Coll. of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, P. R. China 2. Unit 63880, Luoyang 471003, P. R. China | 2007 | Journal of Systems Engineering and Electronics2007，18，2： | 13 |
| 3 | Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone显示文摘Tectonically, the large-scale right-lateral strike-slip movement along the Red River fault zone is char-acterized at its late phase with the southeastward extension and deformation of the Northwestern Yunnan normal fault depression on its northern segment, and the dextral shear displacement on its central-southern segment. Research of the relations between stratum deformation and fault movement on the typical fault segments, such as Jianchuan, southeast Midu, Yuanjiang River, Yuanyang, etc. since the Miocene Epoch shows that there are two times dextral faulting dominated by normal shearing occurring along the Red River fault zone since the Miocene Epoch. The fission track dating (abbrevi-ated to FT dating, the same below) is conducted on apatite samples collected from the above fault segments and relating to these movements. Based on the measured single grain’s age and the con-fined track length, we choose the Laslet annealing model to retrieve the thermal history of the samples, and the results show that the fault zone experienced two times obvious shear displacement, one in 5.5 ± 1.5 MaBP and the other in 2.1± 0.8 MaBP. The central-southern segment sees two intensive uplifts of mountain mass in the Yuanjiang River-Yuanyang region at 3.6―3.8 MaBP and 1.6―2.3 MaBP, which correspond to the above-mentioned two dextral normal displacement events since the late Miocene Epoch. | XIANG HongFa WAN JingLin HAN ZhuJun GUO ShunMin ZHANG WanXia CHEN LiChun DONG XingQuan | 2007 | Science China Earth Sciences2007，50，3： | 10 |
| 4 | Experimental and mesoscopic investigation on the dynamic properties of coral aggregate concrete in compression显示文摘To investigate the dynamic responses and comprehending the damage mechanism of coral aggregate concrete(CAC) in compression, both the experimental and numerical investigations were implemented in the present work. Firstly, the dynamic mechanical properties of CAC at different strain rates were tested through the Split-Hopkinson pressure bar(SHPB) tests.Moreover, the effects of concrete strength grade and strain rate on CAC were discussed and analyzed. Subsequently, we developed the three-dimensional(3D) random mesoscale model considering the randomness of aggregate shape, size and distribution at meso-level, which was validated and employed in the numerical simulation of CAC in compression. The results indicate that the splitting failure passing through the coral aggregate is CAC’S primary failure mode. It has been found that the failure pattern, deformation process, and dynamic increasing factor of CAC are associated with both the strain rate and concrete strength grade. Furthermore, by comparing the experimental and mesoscopic results, it has been proven to be reliable to employ the developed 3D mesoscale modelling method to simulate CAC’s dynamic performances, which has enormous potential in future research of CAC under intense dynamic loadings. | WU Zhang Yu ZHANG JinHua YU HongFa FANG Qin CHEN Li YUE ChengJun | 2021 | Science China(Technological Sciences)2021，64，6： | 5 |
| 5 | Effect of Carbonation and Drying-Wetting Cycles on Chloride Diffusion Behavior of Coral Aggregate Seawater Concrete显示文摘Based on seawater immersion,drying-wetting cycles,carbonation and drying-wetting cycles for coral aggregate sea-water concrete(CASC)with different strength grades,the effect of carbonation and drying-wetting cycles on chloride diffusion be-havior of CASC is studied.The results show that the free surface chloride concentration(Cs),free chloride diffusion coefficient(Df)and time-dependent index(m)of CASC in the drying-wetting cycles is obviously higher than that in seawater immersion.The Df and m of CASC of carbonation and drying-wetting cycles is higher than that in the drying-wetting cycles.Carbonation increases the Df and m of CASC,which is against CASC to resist chloride corrosion.The corrosion possibility of CASC structures in different ex-posed areas is as follows:splash zone(carbonation and drying-wetting cycles)>tidal zone(drying-wetting cycles)>underwater zone(seawater immersion).Besides,the chloride diffusion rate of C65-CASC is 17.8%-63.4%higher than that of C65-ordinary aggre-gate concrete(OAC)in seawater immersion(underwater zone).Therefore,anti-corrosion measures should be adopted to improve the service life of CASC structure in the oceanic environment. | DA Bo LI Yipeng YU Hongfa MA Haiyan CHEN Haoyu DOU Xuemei WU Zhangyu | 2022 | Journal of Ocean University of China2022，21，1： | 2 |
| 6 | An interpolation technique based on grey relational theory显示文摘 | Ke Hongfa Chen Yongguang | 2006 | The Journal of Grey System2006，，： | 1 |
| 7 | An interpolation techniquebased on grey relational theory显示文摘 | KE Hongfa CHEN Yongguang | 2006 | The Journal of GreySystems2006，18，1： | 1 |
| 8 | A Comprehensive Study of Gentianaceae in China显示文摘 | Ho Tingnong Liu Shangwu Liu Jianquan Sun Hongfa Chen Shilong | 2005 | Bulletin of the Chinese Academy of Sciences2005，19，3： | 1 |
| 9 | Target assignment model of electronic equipments based on GM (1,1) model显示文摘 | Ke Hongfa Chen Yongguang Wang Guoyu | 2005 | The Journal of Grey System2005，17，3： | 1 |
| 10 | An interpolation technique based on grey relational theory显示文摘 | Ke Hongfa Chen Yongguang | 2006 | The Journal of Grey System2006，18，1： | 1 |
| 11 | Active thrusting and folding in the Qilian Shah, and decoupling between upper crust and mantle in north eastern Tibet显示文摘 | Tapponnier P Neyer B Avouae J P Pehzer G Gaudemer Y Guo Shunmin Xiang Hongfa Yin Kelun Chen Zhitai Cai Shuahua Dai Huagang | 1990 | Earth Planet gel Lett1990，97，34： | 1 |
| 12 | An inorganic membrane as a separator for lithium-ion battery显示文摘 | Xiang Hongfa Chen Jingjuan Li Zhong | 2011 | J Power Sources2011，196，20： | 1 |
| 13 | Target assignment model of electronic equipments based on GM(1,1)model显示文摘 | Ke Hongfa Chen Yongguang Wang Guoyu | | 0，，03： | 1 |
| 14 | An experimental study of convective heat transfer with microencapsulated phase change material suspension: Laminar flow in a circular tube under constant heat flux显示文摘 | Binjiao Chen Xin Wang Ruolang Zeng Yinping Zhang Xichun Wang Jianlei Niu Yi Li Hongfa Di | 2008 | Experimental Thermal and Fluid Science2008，，8： | 1 |
| 15 | Influence of steel corrosion on axial and eccentric compression behavior of coral aggregate concrete column显示文摘To study the behavior of coral aggregate concrete(CAC)column under axial and eccentric compression,the compression behavior of CAC column with different types of steel and initial eccentricity(ei)were tested,and the deformation behavior and ultimate bearing capacity(Nu)were studied.The results showed that as the ei increases,the Nu of CAC column decreases nonlinearly.Besides,the steel corrosion in CAC column is severe,which reduces the steel section and steel strength,and decreases the Nu of CAC column.The durability of CAC structures can be improved by using new organic coated steel.Considering the influence of steel corrosion and interfacial bond deterioration,the calculation models of Nu under axial and eccentric compression were presented. | Bo DA Yan CHEN Hongfa YU Haiyan MA Bo YU Da CHEN Xiao CHEN Zhangyu WU Jianbo GUO | 2021 | Frontiers of Structural and Civil Engineering2021，15，6： | 1 |
| 16 | Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size on the Splitting-Tensile Properties of Coral Aggregate Concrete显示文摘The use of coral aggregate concrete(CAC)as a novel construction material has attracted significant attention for the construction of reef engineering structures.To investigate the static splitting-tensile behaviors of CAC under the influence of two factors,namely specimen geometry and bearing strip size,a three-dimensional(3D)mesoscale modeling approach with consideration for aggregate randomness in shape and distribution was adopted in this study.We established 12 different specimen models with two specimen shapes(i.e.,a cube with an edge length of 150 mm and a cylinder with dimensions ofφ150 mm×300 mm)and six strip widths(i.e.,6,9,12,15,18,and 20 mm)for calculation.The effects of specimen geometry and strip width on the splitting-tensile properties of CAC,such as failure processes,final failure patterns,and splitting-tensile strength(fst),are analyzed and discussed systematically.The results indicate the high reliability of the developed mesoscale modeling approach and reveal the optimal computational parameters for simulating and predicting the splitting-tensile properties of CAC.The fstvalues of CAC are associated with both the specimen geometry and width of the bearing strip.The fstvalues of the cube model are slightly higher than those of the cylinder model for the same bearing strip size,representing geometry effects that can be explained by differences in fracture area.Additionally,the fstvalue of CAC gradually increases with the relative width of the bearing strip ranging from 0.04 to 0.13.Based on the elastic solution theory,the variation area of CAC fstvalues with the relative width of the bearing strip was determined preliminarily,which has great significance for studying the tensile performance of CAC. | Zhangyu Wu Jinhua Zhang Hongfa Yu Qin Fang Haiyan Ma Li Chen | 2022 | Engineering2022，，10： | 1 |
| 17 | Target Assignment Model of Electronic Equipments Based on GM(l,l) Model显示文摘 | KE Hongfa CHEN Yongguang WANG Guoyu | 2005 | The Journal of Grey System2005，17，03： | 1 |
| 18 | An Interpolation Technique Based on Grey Relational Theory显示文摘 | KE Hongfa CHEN Yongguang | 2006 | The Journal of Grey System2006，18，01： | 1 |
| 19 | An Interpolation Technique Based on Grey Relat ional Theory显示文摘 | KE Hongfa CHEN Yongguang | 2006 | The Journal of Grey System2006，18，01： | 1 |
| 20 | Target Assignment Model of Electronic Equipments Based on GM(1,1)Model显示文摘 | KE Hongfa CHEN Yongguang WANG Guoyu | 2005 | The Journal of Grey System2005，17，03： | 1 |
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