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Search Results: 1 - 10 of 127146 matches for " Qian Wang "
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Integration of Lean Approaches to Manage a Manual Assembly System  [PDF]
Qian Wang, Nick Bennett
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29038

Today, importance of flexibility and reconfigurability needs to be addressed when designing and implementing a cost-effective and responsive manufacturing system. Such a system should be able to accommodate dynamic changes of product varieties and production volumes by maximizing its production capability and minimizing its production costs, this is particularly useful for a SME (small and medium-sized enterprises) to remain competitive in the market. For a manual assembly line, it is always a good practice using a highly skilled workforce that each assembly worker is capable of performing multiple tasks. Ideally, each worker is fully trained to complete assigned tasks of a unit from start to finish. This paper presents a case study of incorporating 5S management rules into an assembly system using so-called skillful and dynamic walking workers as a combination of lean management approaches to improve productivity and efficiency of a shop floor production line at a local plant.

Is There a Reverse U-Shaped Relation between Financial Development and Income Distribution? Comparison between Developed Countries and Transforming Countries  [PDF]
Zhaoying Liu, Qian Wang
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33030
Abstract: Researching relation between financial development and income distribution is always a hotspot issue of theory. In 1990s, Greenwood and Jovanovic proposed the reverse U-shaped relation model between financial development and income distribution. Related scholars conducted empirical analysis accordingly but there was always no consistent conclusion. In this paper, whether there is a reverse U-shaped relation between financial development and income distribution is verified via different country types. USA, UK and Germany are taken as representatives of developed country; China, Russia and Brazil are transforming countries to respectively carry out empirical analysis to relation between financial development and income distribution, and it is found that: there is no reverse U-shaped relation between financial development and income distribution in developed countries, nevertheless there is an apparent reverse U-shaped relation in transforming countries.
An Investigation of Psychological Adjustment Differences among Chinese College Students: From the Perspectives of Their Gender, Major and Grade  [PDF]
Qiang Wang, Qian Zhang
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.616208
Abstract: The goal of the study was to examine levels of psychological adjustment among college students in China; 650 college students took part in Adolescents’ Adaptability Scale (AAS). The results indicated that: 1) there was no significant gender difference in levels of psychological adjustment among college students in China; 2) there were apparent differences in majors. Students who specialized in physical art have the strongest levels of adjustment, while students who majored in arts have the weakest levels of adjustment; 3) significant differences were also existed in Grades, sophomores got the highest levels of adjustment, whereas seniors got the weakest levels of adjustment.
Population Ageing, Urbanization and Housing Demand  [PDF]
Zhangming Wang, Chengzhang Wang, Qian Zhang
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.84052
Abstract: Using overlapping generation model, we find that population ageing does restrain housing demand. Then, we use the panel data of China’s 31 provinces between 2002 and 2013 to confirm that ageing restrains housing demand, the process of urbanization does the opposite and maybe offsets the negative effect to some extent. At present, China should continue to focus on developing urbanization rapidly, especially focus on the population urbanization. In the process, the government should change its development ideas and increase the supply of public service for population ageing.
Search for $J^{PC}=1^{-+}$ exotic state in $e^+e^-$ annihilation
Qian Wang
Physics , 2014, DOI: 10.1103/PhysRevD.89.114013
Abstract: The charmed meson pair $(\frac{3}{2})^+$ and anti-$(\frac{1}{2})^-$, i.e. $D_1(2420)\bar D+c.c.$, $D_1(2420)\bar D^*+c.c.$, $D_2(2460)\bar D^*+c.c.$, can couple to states with vector quantum number $J^{PC}=1^{--}$ and exotic quantum number $J^{PC}=1^{-+}$ in a relative $S$ wave. Near threshold, the charmed meson pair may form hadronic molecules due to the strong $S$-wave coupling, and the mysterious vector state $Y(4260)$ could be such a state of the $D_1(2420)\bar D+c.c.$ molecule. This implies the possible existence of its exotic partner made of the same charmed mesons but with $J^{PC}=1^{-+}$. We evaluate the production rate of such exotic hadronic molecules and propose a direct experimental search for them in $e^+e^-$ annihilation. The confirmation of such exotic states in experiment will shed light on the spectrum in the heavy quark sector.
Improved breakdown criterion for Einstein vacuum equations in CMC gauge
Qian Wang
Mathematics , 2010,
Abstract: Let $\M_*=\cup_{t\in [t_0, t_*)} \Sigma_t$ be a part of vacuum globally hyperbolic space-time $(\bM, \bg)$, foliated by constant mean curvature hypersurfaces $\Sigma_t$ with $t_0
On Ricci coefficients of null hypersurfaces with time foliation in Einstein vacuum space-time
Qian Wang
Mathematics , 2010,
Abstract: The main objective of this paper is to control the geometry of null cones with time foliation in Einstein vacuum spacetime under the assumptions of small curvature flux and a weaker condition on the deformation tensor for $\bT$. We establish a series of estimates on Ricci coefficients, which plays a crucial role to prove the improved breakdown criterion in [12].
A geometric approach for sharp Local well-posedness of quasilinear wave equations
Qian Wang
Mathematics , 2014,
Abstract: The commuting vector fields approach, devised for strichartz estimates in [13], was developed for proving the local well-posedness in the Sobolev spaces $H^s$ with $s>2+\frac{2-\sqrt{3}}{2}$ for general quasi-linear wave equation in ${\mathbb R}^{1+3}$ by Klainerman and Rodnianski. Via this approach they obtained the local well-posedness in $H^s$ with $s>2$ for $(1+3)$ vacuum Einstein equations, by taking advantage of the vanishing Ricci curvature. The sharp, $H^{2+\epsilon}$, local well-posedness result for general quasilinear wave equation was achieved by Smith and Tataru by constructing a parametrix using wave packets. Using the vector fields approach, one has to face the major hurdle caused by the Ricci tensor of the metric for the quasi-linear wave equations. This posed a question that if the geometric approach can provide the sharp result for the non-geometric equations. In this paper, based on geometric normalization and new observations on the mass aspect function, we prove the sharp local well-posedness of general quasilinear wave equation in ${\Bbb R}^{1+3}$ by a vector field approach.
Rough solutions of Einstein vacuum equations in CMCSH gauge
Qian Wang
Mathematics , 2011,
Abstract: In this paper, we consider very rough solutions to Cauchy problem for the Einstein vacuum equations in CMC spacial harmonic gauge, and obtain the local well-posedness result in $H^s, s>2$. The novelty of our approach lies in that, without resorting to the standard paradifferential regularization over the rough, Einstein metric $\bg$, we manage to implement the commuting vector field approach to prove Strichartz estimate for geometric wave equation $\Box_\bg \phi=0$ directly.
Optimization Design of Fracturing Parameters for Coalbed Methane Wells in Dafosi Mine Field  [PDF]
Chuantao Wang, Dongmin Ma, Qian He, Qian Li, Pengcheng Liu
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.59010
Abstract: Being controlled by the gas content of the reservoir, the productivity of CBM well is also mainly determined by its engineering quality and the physical property of the reservoir. In Dafosi mine field, 22 vertical wells from the “26 + 1” CBM wells project that was implemented since 2014 showed great difference in productivity after fracturing construction. With the consistent geological condition of coal reservoirs, fracturing construction parameters are suggested as the priority factor that controlling the well productivity. In this study, being combined with historical production and geological data, an optimized designation of fracturing construction parameters was established based on systematically comparative analysis of construction parameters such as discharge, the total volume of fracturing fluid, the quality of sand, sand ratio, which provides engineering basis for further fracturing construction of CBM wells.
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