http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Seismic performance of the thin-walled square CFST columns with lining steel tubes
Xuanding Wang,Jie-Peng Liu,Xian-tie Wang,Guozhong Cheng,Yan Ding 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.3
This paper proposes an innovative thin-walled square concrete filled steel tubular (CFST) column with an octagonal/circular lining steel tube, in which the outer steel tube and the inner liner are fabricated independently of each other and connected by slot-weld or self-tapping screw connections. Twelve thin-walled square CFST columns were tested under quasi-static loading, considering the parameters of liner type, connection type between the square tube and liner, yield strength of steel tube, and the axial load ratio. The seismic performance of the thin-walled square CFST columns is effectively improved by the octagonal and circular liners, and all the liner-stiffened specimens showed an excellent ductile behavior with the ultimate draft ratios being much larger than 1/50 and the ductility coefficients being generally higher than 4.0. The energy dissipation abilities of the specimens with circular liners and self-tapping screw connections were superior to those with octagonal liner and slot-weld connections. Based on the test results, both the finite element (FE) and simplified theoretical models were established, considering the post-buckling strength of the thin-walled square steel tube and the confinement effect of the liners, and the proposed models well predicted the hysteretic behavior of the liner-stiffened specimens.
Optimal placement of piezoelectric curve beams in structural shape control
Wang, Jian,Zhao, Guozhong,Zhang, Hongwu Techno-Press 2009 Smart Structures and Systems, An International Jou Vol.5 No.3
Shape control of flexible structures using piezoelectric materials has attracted much attention due to its wide applications in controllable systems such as space and aeronautical engineering. The major work in the field is to find a best control voltage or an optimal placement of the piezoelectric actuators in order to actuate the structure shape as close as possible to the desired one. The current research focus on the investigation of static shape control of intelligent shells using spatially distributed piezoelectric curve beam actuators. The finite element formulation of the piezoelectric model is briefly described. The piezoelectric curve beam element is then integrated into a collocated host shell element by using nodal displacement constraint equations. The linear least square method (LLSM) is employed to get the optimum voltage distributions in the control system so that the desired structure shape can be well matched. Furthermore, to find the optimal placement of the piezoelectric curve beam actuators, a genetic algorithm (GA) is introduced in the computation model as well as the consideration of the different objective functions. Numerical results are given to demonstrate the validity of the theoretical model and numerical algorithm developed.
Measurement and Analysis of Burst Topic in Microblog
Guozhong Dong,Xin Zou,Wei Wang,Yaxue Hu,Guowei Shen,Korawit Orkphol,Wu Yang 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.2
Microblog provides the first communication platform for burst event due to the immediacy and interactivity of microblog. In this paper, we research on user-oriented and message-oriented measurements of burst topic in Sina microblog. The measurements and analysis on large-scale Sina microblog data set show that our proposed measurement method can measure the characteristics of user and message propagation in burst topic. The measurement results in this paper can describe the formation and diffusion mechanism of burst topic which will contribute to better research of relevant issues on burst topic and ensure the well-developed of microblog.
Tian Guozhong,Zhang Li,Li Machao,Wang Xiaolei,Zheng Yuhong,Li Xiaojing,Huang Cheng,Li Xuechun,Xie Yongqiong,Xu Li,Ren Hongyu,Shao Zhujun 한국미생물학회 2009 The journal of microbiology Vol.47 No.4
Two hundred and seventy-three Haemophilus influenzae strains isolated from pediatric pneumonia patients in China were studied. We used Multilocus Sequence Typing (MLST) to analyze genotypic characteristics. All strains were biotyped and serotyped. Relatedness and patterns of genes among isolates were determined by the analysis of MLST and eBURST. H. influenzae primarily causes acute pneumonia in children under 1 year old. Nontypeable H. influenzae was responsible for most cases of pediatric pneumonia. All 273 strains were classified into eight biotypes. They mostly belonged to the I, II, and III biotypes (17.6%, 43.6%, and 22.7%, respectively). 62 strains (22.7%) produced β-lactamase. We found 28 novel alleles. Fifty different STs were found by MLST, of which 39 were novel. These were ST477 through ST508 and ST521 through ST527. Group 17 and predicted founders 503 were new groups in this study. No STs correlated with strains from Korea, which is adjacent to China. The H. influenzae strains from China appeared to have heterogeneous ST types patterns which may be the reason no outbreaks or epidemics of H. influenzae infections have occurred in Chengdu city, Sichuan, China.
Optimal placement of piezoelectric curve beams in structural shape control
Jian Wang,Guozhong Zhao,Hongwu Zhang 국제구조공학회 2009 Smart Structures and Systems, An International Jou Vol.5 No.3
Shape control of flexible structures using piezoelectric materials has attracted much attention due to its wide applications in controllable systems such as space and aeronautical engineering. The major work in the field is to find a best control voltage or an optimal placement of the piezoelectric actuators in order to actuate the structure shape as close as possible to the desired one. The current research focus on the investigation of static shape control of intelligent shells using spatially distributed piezoelectric curve beam actuators. The finite element formulation of the piezoelectric model is briefly described. The piezoelectric curve beam element is then integrated into a collocated host shell element by using nodal displacement constraint equations. The linear least square method (LLSM) is employed to get the optimum voltage distributions in the control system so that the desired structure shape can be well matched. Furthermore, to find the optimal placement of the piezoelectric curve beam actuators, a genetic algorithm (GA) is introduced in the computation model as well as the consideration of the different objective functions. Numerical results are given to demonstrate the validity of the theoretical model and numerical algorithm developed.
Jiangtao Hu,Qianhong Gao,Lu Xu,Minglei Wang,Maojiang Zhang,Kuo Zhang,Xiaojing Guo,Weihua Liu,Guozhong Wu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Herein we report a simple and reproducible method for fabricating highly durable and robust superhydrophobic and superoleophilic cotton fabrics via simultaneous radiation-induced graft polymerization of glycidyl methacrylate and subsequent chemical modifications with aminopropyltriethoxysilane and hexamethyldisilazane. The chemical structure and the surface topography of the pristine and the modified cotton fabrics were investigated in detail by ATR-FTIR, XPS, and 29Si NMR, and a grafting layer was successfully immobilized onto the surface of the cotton fabric by forming covalent bonds. Multi-dimensional surface roughness was created by combining micro-sized fibers of the cotton fabric, nanoscaled protuberances of the grafting chain, and molecular level spherical projection points of silicon methyl. The superhydrophobic cotton fabric exhibited long-term stability, ultra-high durability and robustness, and maintained its properties even after 25 wash cycles. The fabric also showed excellent water repellency with a water contact angle of 153 o and a high efficiency of oil/water separation (98 %). The superhydrophobic/superoleophilic cotton fabric developed in the present work exhibits important potential applications in superhydrophobic textiles and oil/water separation.
Industrial test on coal re-burning at a 600MW utility boiler and NOx reduction
Penghua Qiu,Shaohua Wu,Shaozeng Sun,Hui Liu,Longbin Yang,Guozhong Wang 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
research conducts a series of industrial tests on coal reburning of a 600 MW pulverized coal boilerfiring lignite, which is one part of a coal reburning demonstration project. When running steadily under 60 MW load,the boiler has an average NOx emission of 274 mg/m3 (O2 content in flue gas is converted to 6% ), the NOx emissionis reduced by 65.36% . In the meanwhile, loss of ignition (LOI) under coal reburning rarely increases. Three operationconditions - traditional air feeding, air staging and coal reburning - are realized, respectively, during the industrial tests,and the results indicate that coal reburning has the lowest NOx emission, while the traditional air feeding has the highestNOx x controlcan reach.