Ji X.,Tsinghua University |
Kang H.,Tangshan College |
Chen X.,Tsinghua University |
Qian J.,Tsinghua University
Earthquake Engineering and Structural Dynamics | Year: 2014
The steel tube-reinforced concrete (ST-RC) composite column is a novel type of composite column, which consists of a steel tube embedded in RC. In this paper, the seismic behavior of ST-RC columns is examined through a series of experiments in which 10 one-third scale column specimens were subjected to axial forces and lateral cyclic loading. The test variables include the axial force ratio applied to the columns and the amount of transverse reinforcement. All specimens failed in a flexural mode, showing stable hysteresis loops. Thanks to the steel tube and the high-strength concrete it is filled with, the ST-RC column specimens had approximately 30% lower axial force ratios and 22% higher maximum bending moments relative to the comparable RC columns when subjected to identical axial compressive loads. The amount of transverse reinforcement made only a small difference to the lateral load-carrying capacity but significantly affected the deformation and energy dissipation capacity of the ST-RC columns. The specimens that satisfied the requirements for transverse reinforcement adopted for medium ductile RC columns as specified by the Chinese Code for Seismic Design of Buildings (GB 50011-2010) and EuroCode 8 achieved an ultimate drift ratio of around 0.03 and a displacement ductility ratio of approximately 5. The design formulas used to evaluate the strength capacity of the ST-RC columns were developed on the basis of the superposition method. The predictions from the formulas showed good agreement with the test results, with errors no greater than 10%. © 2013 John Wiley & Sons, Ltd.
Zhang Y.,Tangshan College
Journal of Networks | Year: 2012
Based on the security of information transmission through network in the information society, the paper puts forward covert communication technology which is more reliable than the prior encryption algorithm, analyzes channel covertness and information hiding of covert communication technology based on spread-spectrum communication technology, and establishes a covert communication system including image steganalysis, Arnold transformation and scrambling of carrier image, embedding of secret information, generation of encrypted image and recovering of carrier image by image-based covert communication technology. The simulation result shows: in order to ensure there is no serious degrading problem after embedding the secret information, the carrier image must have a large capacity; the larger the scrambling times is, the better the scrambling and encrypting effect is. Therefore, the airspace covert communication algorithm based on spread-spectrum communication technology well achieves safe transmission of information and has good application prospect. © 2012 ACADEMY PUBLISHER.
Wu S.L.,Tangshan College
Zhonghua xin xue guan bing za zhi | Year: 2010
To observe the prevalence, blood pressure change in prehypertensive population and associated cardiovascular risk factors. Data from a prehypertensive cohort defined with the JNC-7 prehypertension diagnostic criteria were obtained in the employees of kailuan group during the health examination between 2006 to 2007 and the same population was revisited between 2008 to 2009 to observe the change of blood pressure and the associated determinants for blood pressure change. (1) There were 25 474 prehypertensive during the 1(st) visit and 8361 subjects developed hypertension during the 2(nd) visit (35.3% in men and 23.3% in women, 27.2% with baseline blood pressure 120 - 129/80 - 84 mm Hg (1 mm Hg = 0.133 kPa) and 43.8% with baseline blood pressure 130 - 139/85 - 89 mm Hg, 34.3% with risk factors and 19.9% without risk factors). (2) Multiple logistic regression analysis showed that the baseline SBP, waist circumference, age, BMI, gender (male), DBP, TC, FBG, TG, LDL-C were the risk factors of blood pressure progression with a RR (95%CI) of 1.052 (1.048 - 1.056), 1.009 (1.006 - 1.013), 1.023 (1.021 - 1.026), 1.063 (1.052 - 1.074), 1.554 (1.442 - 1.675), 1.036 (1.029 - 1.043), 1.064 (1.037 - 1.093), 1.043 (1.024 - 1.062), 1.041 (1.021 - 1.062) and 1.035 (1.000 - 1.072), respectively. A third (32.8%) prehypertensive population progressed into hypertension after two years, baseline SBP, waist circumference, age, BMI, gender (male), DBP, TC, FBG, TG, LDL-C were the risk factors of predicting blood pressure progression.
Guo Y.H.,Tangshan College
Applied Mechanics and Materials | Year: 2014
A granary parameter wireless monitoring system based on Internet is introduced, in which the wireless sensor network is built by using the temperature and humidity sensor and the CC2430 wireless chip, the embedded gateway and the Web server are built by using the embedded ARM chip S3C2410, the system overall structure and hardware circuit and software design are detailed described. In the system, the remote wireless monitoring of grain parameters is realized, users can perform data transmission and monitoring by Internet. The whole system is stable, reliable, low power consumption and it can meet the measurement requirements. © (2014) Trans Tech Publications, Switzerland.
Hao T.,Tangshan College
Advanced Materials Research | Year: 2012
The pipe model is simplified as elastic foundation beam model of Euler-Bernoulli, the form of pin rocker bearing in the analysis of transverse vibration in the paper. According the principle of Hamilton, after a series of variation, exchanging the order of integral and integration by parts, the transverse vibration differential equation of pipe is obtained without fluid. Considering different boundary consitions, the solving process is carried out. By utlization of MALAB language, the numerical example is analyzed, considering fluid and foundation. Thus, the fluid-solid coupling interaction is not ignored in transverse vibration in the buried pipeline. © (2012) Trans Tech Publications.
Liu X.-W.,Tangshan College
Proceedings - 2016 8th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2016 | Year: 2016
Parametric module of gas blast soot blower distributor is created and friendly parametric dialog interface is developed by redevelopment of Pro/E using redevelopment tool Pro/Toolkit of Pro/E software system and Visual c++ 6.0 programming language. Parametric regeneration of distributor parts can be automatically realized and design efficiency of distributor improved by using the parametric module. © 2016 IEEE.
Wang J.,Tangshan College
International Journal of Pattern Recognition and Artificial Intelligence | Year: 2013
Subspace analysis is an effective approach for face recognition. In this paper, a novel subspace method, called kernel supervised discriminant projection (KSDP), is proposed for face recognition. In the proposed method, not only discriminant information with intrinsic geometric relations is preserved in subspace, but also complex nonlinear variations of face images are represented by nonlinear kernel mapping. Extensive experiments are performed to test and evaluate the new algorithm. Experimental results on three popular benchmark databases, FERET, Yale and AR, demonstrate the effectiveness of the proposed method, KSDP. © 2013 World Scientific Publishing Company.
Yang J.,Tangshan College
Jiegou Huaxue | Year: 2014
A theoretical investigation of the reaction mechanisms for C-H and C-C bond activation processes in the reaction of Ni with cycloalkanes C nH2n (n = 3~7) is carried out. For the Ni + C nH2n (n = 3, 4) reactions, the major and minor reaction channels involve C-C and C-H bond activations, respectively, whereas Ni atom prefers the attacking of C-H bond over the C-C bond in CnH 2n (n = 5~7). The results are in good agreement with the experimental study. In all cases, intermediates and transition states along the reaction paths of interest are characterized. It is found that both the C-H and C-C bond activation processes are proposed to proceed in a one-step manner via one transition state. The overall C-H and C-C bond activation processes are exothermic and involve low energy barriers, thus transition metal atom Ni is a good mediator for the activity of cycloalkanes CnH2n (n = 3~7). Copyright © 2013 Editorial Board of Chinese Journal of Structurnal Chemistry.
Wang J.,Tangshan College
Applied Mathematics and Information Sciences | Year: 2012
For supervised discriminant projection (SDP)method, the image matrix data are vectorized to find the intrinsic manifold structure, and the dimension of matrix data is usually very high, so SDP cannot be performed because of the singularity of scatter matrix. In addition, the matrix-to-vector transform procedure may cause the loss of some useful structural information embedding in the original images. Thus, in this paper, a novel method, called 2D supervised discriminant projection (2DSDP), for face recognition is proposed. The proposed method not only takes into account both the local information of the data and the class information of the data to model the manifold structure, but also preserves the useful information of the image data. To evaluate the performance of the proposed method, several experiments are conducted on the Yale face database, and the FERET face database. The high recognition rates demonstrate the effectiveness of the proposed method. © 2012 NSP Natural Sciences Publishing Cor.
Lv H.-L.,Tangshan College
Proceedings - 2013 International Conference on Mechatronic Sciences, Electric Engineering and Computer, MEC 2013 | Year: 2013
This paper studies the power transformer fault quality diagnosis using the technology of intelligent diagnosis. It is rough set theory as the pre-unit of neural network. A large number of original data is made reduction by means of rough set algorithm and become the train data of BP neural network. Through simulation with practical data it is proved that the method of RSNN can make the training time shorter and the diagnostic accuracy is higher compared with the traditional neural network method. © 2013 IEEE.