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Search Results: 1 - 10 of 29445 matches for " Mao Zheng "
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Context-Based Mobile User Interface  [PDF]
Mao Zheng, Sihan Cheng, Qian Xu
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.49001
Abstract: Context awareness is increasingly gaining applicability in interactive ubiquitous mobile computing systems. Each context-aware application has its own set of behaviors to react to context modifications. Hence, every software engineer needs to clearly understand the goal of the development and to categorize the context in the application. We incorporate context-based modifications into the appearance or the behavior of the interface, either at the design time or at the run time. In this paper, we present application behavior adaption to the context modification via a context-based user interface in a mobile application. We are interested in a context-based user interface in a mobile device that is automatically adapted based on the context information. We use the adaption tree, named in our methodology, to represent the adaption of mobile device user interface to various context information. The context includes the user’s domain information and dynamic environment changes. Each path in the adaption tree, from the root to the leaf, presents an adaption rule. An e-commerce application is chosen to illustrate our approach. This mobile application was developed based on the adaption tree in the Android platform. The automatic adaption to the context information has enhanced human-computer interactions.
A Study on Parallel Computation Based on 3D Forward Algorithm of Gravity  [PDF]
Mao Wang, Yuanman Zheng, Changli Yao
International Journal of Geosciences (IJG) , 2017, DOI: 10.4236/ijg.2017.89060
Abstract: Interpretation of geophysical material is the prospecting method. Interpretation of Gravity-megnetic data is based on data processing and inversion. When the grid is divided into several million cells, the computing task is heavy and time-consuming. In order to increase efficiency of the 3D forward modeling, the paper will adopt MPI parallel algorithm and the several processes will deal with data in the method. Finally, we can gather the result. Through comparing the result of sequence algorithm with the result of MPI parallel algorithm, we can see the result is the same. When the number of processes is 2 to 8, the speed-up ratio is 1.97 to 5. The MPI parallel algorithm is very efficient.
Effect of pouring temperature on semi-solid slurry of ZL101 alloy prepared by slightly electromagnetic stirring
Liu Zheng,Mao Weimin
China Foundry , 2009,
Abstract: The semi-solid slurry of ZL101 alloy is prepared by a combination technology of low superheat pouring and slightly electromagnetic stirring. The effects of pouring temperature on the slurry prepared by the technology are investigated. The results indicate that it is feasible to prepare the slurry with globular primary phases by low superheat pouring and slightly electromagnetic stirring, and that the pouring temperature has an important effect on the morphology and the size of primary α-Al in ZL101 alloy. By applying suitable slightly electromagnetic stirring combining with relatively increased pouring temperature, i.e., in a practical way to apply low superheat pouring technology, is capable of obtaining appropriate semi-solid slurry of ZL101 alloy with globular shape of primary phase. Compared with the samples made by low superheat pouring only without stirring, the samples prepared by applying both slightly electromagnetic stirring and low superheat pouring can enable to achieve the same grain size and morphology of the primary phase with that of pouring at 15-35℃ higher.
Frictional Effects on Gear Tooth Contact Analysis
Zheng Li,Ken Mao
Advances in Tribology , 2013, DOI: 10.1155/2013/181048
Abstract: The present paper concentrates on the investigations regarding the situations of frictional shear stress of gear teeth and the relevant frictional effects on bending stresses and transmission error in gear meshing. Sliding friction is one of the major reasons causing gear failure and vibration; the adequate consideration of frictional effects is essential for understanding gear contact behavior accurately. An analysis of tooth frictional effect on gear performance in spur gear is presented using finite element method. Nonlinear finite element model for gear tooth contact with rolling/sliding is then developed. The contact zones for multiple tooth pairs are identified and the associated integration situation is derived. The illustrated bending stress and transmission error results with static and dynamic boundary conditions indicate the significant effects due to the sliding friction between the surfaces of contacted gear teeth, and the friction effect can not be ignored. To understand the particular static and dynamic frictional effects on gear tooth contact analysis, some significant phenomena of gained results will also be discussed. The potentially significant contribution of tooth frictional shear stress is presented, particularly in the case of gear tooth contact analysis with both static and dynamic boundary conditions. 1. Introduction In modern world, many reliable gear manufacture techniques have existed and operated for modern industry; the advanced high performance gears products are indispensable components for lots of power-train transmission systems. As a basic transmission part, gears have been used for three thousand years in history, and the investigation of gear design techniques and product performance kept developing all the time. In 1892, Wilfred Lewis first presented a formula for evaluating the bending stress of gear teeth in which the tooth form entered into the equation. The formula still remains the basis for most gear design today, and the parameter proposed as “Lewis stress” can indicate the bending stress of loaded contacted gear teeth accurately. But in further investigation on the basis of the application of Lewis stress, the nonlinear responses due to frictional effects in meshing process have become obvious gradually, and many scientists have been tried to investigate any reliable techniques to predict frictional effect on gear performance. In 1982, Barakat [1] presented a technique for the determination of the instantaneous coefficient of friction at gear tooth contact by considering tooth fillet strains using finite
Adaptive Mobile Applications to Dynamic Context  [PDF]
Mao Zheng, Boheng Wei, Zhenyu Zhang, Xi Yan
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29002
Abstract:

Context-aware computing is a mobile computing paradigm in which applications can discover and take advantage of contextual information, such as user location, time of the day, nearby people and devices, and user activity. This paper intends to study the context-awareness in depth and demonstrate the usefulness of this new technology through two mobile applications that are adaptive to dynamic context.

SEMI–SOLID A356 ALLOY SLURRY PREPARED BY A NEW PROCESS

LIU Zheng,MAO Weimin,ZHAO Zhenduo,

金属学报 , 2009,
Abstract: Because of the solidifying characteristic of alloy and the difference in thermal conductivity of mould, the microstructures of different zones of semi–solid slurry are different, which is hard to satisfy the requirement of rheoforming. A new process preparing semi–solid slurry is proposed, in which a locally rapid cooling near the center zone of mould can be realized by inserting a copper rod into the slurry and then pulling out repeatedly, except application of a weakly electromagnetic stirring. Semi–solid A356 alloy slurry was prepared by the new process and the effects of the new process on morphology and size of primary α–Al in semi–solid A356 were researched. The results indicate that the nucleation rate, morphology and grain size of primary α–Al are markedly improved by the new process. Primary α–Al with small size presents particle–like or globular–like and distributes uniformly in the slurry even at lower overheating. The grain refining and structural homogeneity are relative to homogenization of the temperature field in the mould.
Noncommutative QED corrections to process $e^+e^-\to\mu^+\mu^-\gamma$ at linear collider energies
Fu, Yongming;Sheng, Zheng-Mao
High Energy Physics - Phenomenology , 2007,
Abstract: The cross section for process $e^+e^-\to\mu^+\mu^-\gamma$ in the framework of noncommutative quantum electrodynamics(NC QED) is studied. It is shown that the NC correction of scattering sections is not monotonous enhancement with total energy of colliding electrons, but there is an optimal collision energy to get the greatest NC correction. Moreover, there is a linear relation between NC QED scale energy and the optimal collision energy. The experimental methods to improve the precision of determining NC effects are discussed, because this process is an ${\cal O}(\alpha^3) $ NC QED process, high precision tests are necessary.
Non-damped Acoustic Plasmon and Superconductivity in Single Wall Carbon Nanotubes
Zheng-Mao Sheng,Guoxiang Huang
Physics , 2001,
Abstract: We show that non-damped acoustic plasmons exist in single wall carbon nanotubes (SWCNT) and propose that the non-damped acoustic plasmons may mediate electron-electron attraction and result in superconductivity in the SWCNT. The superconducting transition temperature Tc for the SWCNT (3,3) obtained by this mechanism agrees with the recent experimental result (Z. K. Tang et al, Science 292, 2462(2001)). We also show that it is possible to get higher Tc up to 99 K by doping the SWCNT (5,5).
Dark Soliton Excitations in Single Wall Carbon Nanotubes
Zheng-Mao Sheng,Guoxiang Huang
Physics , 2001,
Abstract: Dark soliton excitations are shown to exist in single wall carbon nanotubes (SWCNTs). At first, the nonlinear effective interatomic potential and the difference equation for longitudinal lattice displacement are obtained for the SWCNTs by expanding Brenner's many-body potential in a Taylor series up to fourth-order terms. Then using a multi-scale method, for short wavelength lattice excitations the equation of motion of lattice is reduced to the cubic nonlinear Schrodinger equation. Finally, the dark soliton solutions and relevant excitations in the SWCNTs with subsonic velocity are discussed.
Manufacture technique of semi-solid slurry of hypoeutectic Al-Si alloy by low superheat pouring and weak electromagnetic stirring
LIU Zheng,MAO Wei-ming,ZHAO Zheng-duo
China Foundry , 2006,
Abstract: The semi-solid slurry of hypoeutectic Al-Si alloy was manufactured by low superheat pouring and weak electromagnetic stirring. The effects of pouring temperature and stirring power on the semi-solid slurry making process were investigated. The results indicate that the semi-solid slurry to satisfy rheocasting requirement can be made by a combination of low superheat pouring and weak electromagnetic stirring. The pouring temperature (or superheat) and the stirring power significantly affect the morphology and the size of primary α-Al, while there is no obvious effect of the stirring time on primary α-Al. Compared with the samples made by low superheat pouring without stirring, the nucleation rate, particle morphology and grain size of primary α-Al in A356 Al alloy are markedly improved by a process of applying both low superheat pouring and weak electromagnetic stirring. Under the condition of weak electromagnetic stirring applied, the pouring temperature with low superheat can be equivalently to reach the effectiveness obtained from the even lower pouring temperature without stirring.
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