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Search Results: 1 - 10 of 151695 matches for " Wang Xu "
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Electronic Ratchet Nanodiodes  [PDF]
Kunyuan XU, Gang WANG
Engineering (ENG) , 2009, DOI: 10.4236/eng.2009.12015
Abstract: Using a two-dimensional ensemble Monte Carlo (EMC) method, electronic nanometer devices with different parameters are studied in detail. Calculation results show that at nanoscale the electric properties of interface inside the devices play an important role in determining the working properties of the devices. By properly arranging device structures, surface charges originated from device fabrication can be exploited to produce a predetermined electric potential in the devices. Based on this fact, two structures that can lead to an asymmetric potential along their nanochannel are proposed for designing strong nonlinear devices. Further studies indicate that Ratchet effect brought by the asymmetric potential results in diode-like current-voltage characteristics of the devices. Through optimizing device parameters, zero threshold voltage can be achieved, which is desired for detecting applications. Moreover, since the devices are at nanoscale, simulation results reveal that used as rectifiers the working frequencies can be up to a few THz.
Empirical Research on Construct of Chain Store Logistics Capability System  [PDF]
Liang Xu, Shankun Wang
iBusiness (IB) , 2012, DOI: 10.4236/ib.2012.41002
Abstract: Based on the review of the relevant researches on logistics capability in domestic and oversea, this paper analyses theories of chain store logistics capability and summarizes the structure of the chain store logistics capability. It puts forward that chain store logistics capability is made up of two aspects: static capability and dynamic capability, develops relevant measurement tool. The scale of the framework is reliable and valid, tested by the sample collected from the 48 domestic chain enterprises.
Free Vibration Analysis of Elastic Bodies for Six-Axis Force Sensor  [PDF]
Dezhang Xu, Zhihong Wang
Journal of Sensor Technology (JST) , 2013, DOI: 10.4236/jst.2013.31003

Now the six-axis force sensor (6-AFS) is used widely, and as the core components, mechanical properties of its elastic bodies are significant. With the increase of dynamic loads, studies on dynamic characteristics of the 6-AFS become more and more important. In this paper, the study focuses on the free vibration problem of a novel 6-AFS. The research approach is to decompose the sensor into several separate elastic bodies (four lamellas and upper and lower membranes) and research these elastic bodies respectively. The free vibration of the lamella is studied based on Rayleigh-Ritz method and the separation of variables. The analytical solutions of free vibration of the membranes are deduced according to the nature of Bessel functions. Both the analytical results are simulated with MATLAB. Compared the simulated diagrams with actual situations, they are very close. The mode shapes obtained play a major role in solving the forced vibration of the sensor.

Cue Competition between Animacy and Word Order: Acquisition of Chinese Notional Passives by L2 Learners  [PDF]
Jia Wang, Caihua Xu
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.52017
Abstract: Based on the Competition Model (Bates & MacWhinney, 1978; MacWhinney, 2005; MacWhinney, 2012), the present study investigates L2 cue strategies in the acquisition of Chinese notional passives by English-speaking and Japanese-speaking learners. Two experiments were conducted to examine both the comprehension and production of Chinese notional passives. The main findings included: 1) L2 learners’ acceptability of notional passive increased with improved Chinese proficiency but even advanced learners showed significant difference from Chinese native speakers; 2) L2 learners produced more notional passive sentences than bei-passive sentences and advanced learners showed no difference from Chinese native speakers; 3) Cross-linguistic influence seemed to affect L2 learners’ comprehension and production of Chinese notional passives. The results support the universality of animacy cue proposed by Gass (1987) but also suggest that word order and pragmatic factors may affect L2 learners’ cue strategies. The study also evidences the contribution of the input to the development of L2 cue strategies, which is in line with the predictions of the Competition Model.
Strategic Emerging Industries in China: Literature Review and Research Prospect  [PDF]
Dongbei Xu, Jianmin Wang
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.57049
Abstract: Based on the research articles about the strategic emerging industries in China of Chinese Social Sciences Citation Index (CSSCI) on http://www.cnki.net/ from 2010 to 2014, we analyze the research literature from quantitative and qualitative perspective and prospect the future research directions of the strategic emerging industries in China. The research data shows that the studies on strategic emerging industries in China have developed rapidly these years, the high-level research results are increasingly abundant, but some problems should be further studied. And we believe that the researchers should focus on the empirical studies based on the development of the practices, and make efforts to construct a whole systematic research framework and pay more attention to the studies on strategic human resources.
Support-Limited Generalized Uncertainty Relations on Fractional Fourier Transform  [PDF]
Xiaotong Wang, Guanlei Xu
Journal of Signal and Information Processing (JSIP) , 2015, DOI: 10.4236/jsip.2015.63021
Abstract: This paper investigates the generalized uncertainty principles of fractional Fourier transform (FRFT) for concentrated data in limited supports. The continuous and discrete generalized uncertainty relations, whose bounds are related to FRFT parameters and signal lengths, were derived in theory. These uncertainty principles disclose that the data in FRFT domains may have?much higher concentration than that in traditional time-frequency domains, which will enrich the ensemble of generalized uncertainty principles.
Perineal Electric Burn Reconstruction Using Modified Thoraco-Umbilical Flap  [PDF]
Bin Xu, Jinlong Wang
International Journal of Clinical Medicine (IJCM) , 2016, DOI: 10.4236/ijcm.2016.77050
Abstract: Perineal reconstruction is an essential component of the overall treatment plan of perineal electric burn, but it is a very difficult and complex job. The modified thoraco-umbilical flap may be a perfect way of repairing perineal area. It is based on the deep inferior epigastric artery and vein and the superior epigastric artery and vein, which look like the “reverse TRAM flap”. The large flap could be fashioned into a perfect perineal area without the need for free flap. It left a satisfactory donor scar, and it avoided the need to change the patient’s position during the operation. Four cases were reconstructed by modified thoraco-umbilical flap after perineal electric burn, and all of them were satisfied with the results. The modified thoraco-umbilical flap has been emerged as a very useful reconstructive tool and is particularly valuable in reconstruction of the perineal electric burn.
A Study of Tourist Loyalty Driving Factors from Employee Satisfaction Perspective  [PDF]
Ronglin Xu, Jianqiong Wang
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.612105
Abstract: With the continuous development of tourism, the driving mechanism of tourist loyalty has become one of the hot topics in the tourist behavior study. Existing researches often explore this question with little focus on the interaction of tourist and employees. This paper, however, proposes a conceptual model of tourist loyalty from employee satisfaction perspective. Our hypothesis is that service quality and tourist loyalty could directly be affected by employee satisfaction and indirectly be affected by employee emotion. To test this, we take Jiuzhaigou and Huanglong scenic spots as examples in the empirical study. The research results reveal that among the three latent variables of employee satisfaction, working environment and living conditions affect service quality of employee positively, meanwhile, working environment, living conditions and working rewards indirectly affect service quality through employee emotion. Service quality affects the tourist loyalty significantly. To cultivate tourist loyalty and achieve sustainable tourism development, scenic spots should take more measures to enhance their employee satisfaction and tourism service quality.
Lyapunov-Type Inequalities for Conformable BVP  [PDF]
Xia Wang, Run Xu
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.67131
In this paper, we present Lyapunov-type inequality for conformable BVP \"\" with the conformable fractional derivative of order 1≤2 and 2≤3 with corresponding boundary conditions. We obtain the Lyapunov-type inequality by a construction Green’s function and get its corresponding maximum value. Application to the corresponding eigenvalue problem is also discussed.
A Data-Placement Strategy Based on Genetic Algorithm in Cloud Computing  [PDF]
Qiang Xu, Zhengquan Xu, Tao Wang
International Journal of Intelligence Science (IJIS) , 2015, DOI: 10.4236/ijis.2015.53013
Abstract: With the development of Computerized Business Application, the amount of data is increasing exponentially. Cloud computing provides high performance computing resources and mass storage resources for massive data processing. In distributed cloud computing systems, data intensive computing can lead to data scheduling between data centers. Reasonable data placement can reduce data scheduling between the data centers effectively, and improve the data acquisition efficiency of users. In this paper, the mathematical model of data scheduling between data centers is built. By means of the global optimization ability of the genetic algorithm, generational evolution produces better approximate solution, and gets the best approximation of the data placement at last. The experimental results show that genetic algorithm can effectively work out the approximate optimal data placement, and minimize data scheduling between data centers.
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