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Search Results: 1 - 10 of 113391 matches for " Xue Zhang "
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Research on Personnel Cultivation of Higher Engineering Education in China From Perspective of Problems and Solutions based on Training Process  [PDF]
Zhang Xue
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.37B018

In the past 10 years, higher engineering education has developed rapidly, and made the contribution to the modern engineering education system. However, cultivation of higher engineering education students meets new problems. Therefore, it is essential to deal with the problems to improve the quality of higher engineering education, and good advice should help engineering graduates more suitable to society.

A Real-Time Urban Traffic Detection Algorithm Based on Spatio-Temporal OD Matrix in Vehicular Sensor Network  [PDF]
Ke Zhang, Guangtao Xue
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.29080
Abstract: Currently, there are kinds of algorithms in order to detect real-time urban traffic condition. Most of these approaches consider speed of vehicles as a main metric to describe traffic situation. In this paper, we find out two important observations through several experiments. (1) In urban city, the speed of vehicles is influenced significantly by some factors such as traffic lights delay and road condition. The actual situation rarely satisfy hypothesis required for these solutions. Therefore, these traditional algorithms do not work well in practical environment. (2) Traffic volume on a road segment shows strong pattern and changes smoothly at adjacent time. This feature of traffic volume inspires us to define a metric: traffic-rate, which is used to detect traffic condition in real time. In our solution, we develop a novel traffic-detection algorithm based on original- destination (OD) matrix. We illustrate our approach and measure its performance in real environment. The performance evaluations confirm the effectiveness of our algorithm.
Solar Hot System and Design of Buildings  [PDF]
Yibing Xue, Jie Zhang
International Journal of Clean Coal and Energy (IJCCE) , 2013, DOI: 10.4236/ijcce.2013.22B003

Domestic solar hot water system, the use of the status quo and existing problems, by analyzing the solar water heating equipment and building integrated and building integrated design.

Ground States for a Class of Nonlinear Schrodinger-Poisson Systems with Positive Potential  [PDF]
Guoqing Zhang, Xue Chen
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.61004
Abstract: Based on Nehari manifold, Schwarz symmetric methods and critical point theory, we prove the existence of positive radial ground states for a class of Schrodinger-Poisson systems in \"\" , which doesn’t require any symmetry assumptions on all potentials. In particular, the positive potential is interesting in physical applications.
Preparation of MgAl LDHs Intercalated with Amines and Effect on Thermal Behavior for Poly(vinyl chloride)  [PDF]
Xiaoyu Xue, Hongmei Zhang, Shuhua Zhang
Advances in Materials Physics and Chemistry (AMPC) , 2014, DOI: 10.4236/ampc.2014.412028
Abstract: MgAl LDHs intercalated with CO(NH2)2, NH4Cl and NH3·H2O were prepared by co-precipitation and XRD, FT-IR, TGA-DTA and SEM techniques were employed for characterization. The results indicated that the layer-layer spacing of LDHs was enlarged by 0.169, 0.285 and 0.227 Å with the intercalation of CO(NH2)2, NH+4 and NH3, separately. The effects on thermal stability and degradation behavior of synthesized LDHs where mole ratios of Mg/Al/urea = 3:1:1, Mg/Al/NH4Cl = 3:1:1.5 and Mg/Al/NH3·H2O = 3:1:0.5 were investigated by Congo Red Method and thermogravimetric analysis (TGA) from 25°C - 800°C under N2. The TGA and DTA results showed, by incorporating 5% MgAl-CO(NH2)2 LDH, the dehydrochlorination temperature of PVC composites is 12°C higher than MgAl-NH+4 and MgAl-NH3 LDHs. MgAl-NH3 LDH enhances the ending temperature of the first degradation stage of PVC composites by 8°C compared with MgAl LDH. The LDH intercalated with CO(NH2)2 is proved to be an effective thermal stabilizer for PVC processing.
Structures of LDHs Intercalated with Ammonia and the Thermal Stability for Poly(vinyl chloride)  [PDF]
Xiaoyu Xue, Shuhua Zhang, Hongmei Zhang
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.64032
Abstract: MgAl-NH3 LDHs (layered double hydroxides), ZnAl-LDHs and ZnAl-NH3 LDHs with different molar ratio of Al/ammonia were synthesized by co-precipitation method. The synthetic LDHs samples were characterized by XRD, FT-IR, TGA-DTG and SEM techniques and tested by Congo red method. In addition, after PVC (Poly vinyl chloride) and DOP (Dioctylphthalate) were added to LDHs, the thermal stability for PVC was characterized by TGA-DTG. The results indicated that LDHs intercalated with ammonia improved thermal stability for PVC significantly, MgAl-NH3 LDHs (Mg2+:Al3+: NH3·H2O = 3:1:0.5) and ZnAl-NH3 LDHs (Zn2+:Al3+:NH3·H2O=2:1:1.5) showed the best thermal stability for PVC, interlayered space of LDHs became larger by intercalating ammonia.
Ecological Tunnel for the 21st Century: A New Conception and Methodology  [PDF]
Zixin Zhang, Qinghua Lei, Qiang Xue
Journal of Transportation Technologies (JTTs) , 2011, DOI: 10.4236/jtts.2011.13008
Abstract: This paper presents a new conception—ecological tunnel, which is contrived to meet increasingly tough challenges in the 21st century. Ecological tunnel refers to integrating ecological principles into tunnel design, construction and operation in order to create a balanced and sustainable tunnel-nature system. It consists of four elements: green tunneling, green lighting, green lining, and green recycling of excavated material. The conception, function and implementation of each part are elaborated in the paper. In addition, computer visualization technique is applied to simulate complicated internal conditions of an ecological tunnel.
Kinetics Analyzing of Direction Reduction on Manganese Ore Pellets Containing Carbon  [PDF]
Bo Zhang, Zheng-Liang Xue
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.23017
Abstract: Using high temperature carbon tube furnace, reduction of manganese ore pellets containing carbon was investigated. The reaction was divided into two stages at five minutes after reaction, and the kinetics model of reduction process was established. The experimental results showed that, the reaction rate in the earlier stage was controlled by the chemical reactions between FeO, MnO and carbon reductant, and the activation energy was 28.85 KJ/mol. In the later stage, as the carbon reductant replaced by CO, the reaction rate was controlled by CO-diffusing in solid products, and the cor- responding activation energy was 86.56 KJ/mol. Reaction rate of the later stage was less than the earlier one.
Advection Dispersion Equation and BMO Space  [PDF]
Kan Zhang, Tieliang Wang, Xue Feng
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.15018

In this paper, we provide a new way of characterizing the upper and lower bound for the concentration and the gradient of concentration in advection dispersion equation under the condition that source term, concentration and stirring term belong to BMO space.

The Study on Community Health Education of Empty Nest Elderly  [PDF]
Ling Gao, Xue Cao, Min Zhang
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B028

Objective:To study the demands of community health education on the empty nest elderly and analyse the related factors. Methods:The 36-Item Short-Form Health Survey(SF-36), activities of daily living (ADL) and the community health services satisfaction scale were used to investigate the community health service demand and supply of 358 empty nesters. Results:The results showed that the ability of self-care was worse and needed more nursing or caring from others in the empty nest elderly; the empty nest elderly, in comparison with the non-empty-nest elderly, had lower physical and mental scores. With the age changing, the requirements of community health services were different in empty nest elderly and the satisfaction of community health service was low in the empty nest (39.1%). Conclusions: Empty nest elderly generally needed the different degree of community health education demands. The utilization rates of community health education were low.

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