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Search Results: 1 - 10 of 64657 matches for " Liang Wu "
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On Open Problems of Nonnegative Inverse Eigenvalues Problem  [PDF]
Jun-Liang Wu
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14025
Abstract: In this paper, we give solvability conditions for three open problems of nonnegative inverse eigenvalues problem (NIEP) which were left hanging in the air up to seventy years. It will offer effective ways to judge an NIEP whether is solvable.
Protecting Labor Rights in Globalization: A Study on Labor Law Implement in China  [PDF]
Qiuxian Liang, Weidong Wu
Advances in Applied Sociology (AASoci) , 2018, DOI: 10.4236/aasoci.2018.812043
Abstract: This paper employs the data from a survey conducted in Shanghai and other nine cities and uses the Logistic Regression Model to analyze it, from the perspectives of globalization. The study finds that the race to the bottom among employers may affect the behavior change of individual under laws intervention and then affect the action result of labor law’s article on labor contract signing, minimum wage and basic pension plan participation.
Safety Control Technology of Deepwater Perforated Gas Well Testing  [PDF]
Hao Liang, Muwang Wu
Engineering (ENG) , 2019, DOI: 10.4236/eng.2019.113011
Abstract: Due to the high difficulties, high investment, and high risks in deepwater oil and gas well testing, major safety problems can occur easily. A key to prevent accidents is to conduct safety assessment and control on deepwater testing and to improve the testing technology. The deepwater of the South China Sea has some special environmental features: long distance from offshore, frequent typhoons in summer and constant monsoons in winter, and the presence of sandy slopes, sandy ridges and internal waves, coupled with the complex properties of oil and gas reserves which bring more challenges to deepwater well testing. In combination with deepwater well testing practice in the South China Sea, this paper analyzes the main potential risks in deepwater well testing and concludes that there are risks of failures of testing string, tools, and ground processes. Other risks are gas hydrate blockage, reservoir stratum sanding, and typhoon impacts. Specific precautions are also proposed in response to these risks in the paper.
Scaling Properties of Urban Facilities
Liang Wu
Physics , 2014, DOI: 10.1103/PhysRevE.90.062808
Abstract: Two measurements are employed to quantitatively investigate the scaling properties of the spatial distribution of urban facilities, the K function by number counting and the variance-mean relationship with the method of expanding bins. The K function and the variance-mean relationship are both power functions. It means that the spatial distribution of urban facilities are scaling invariant. Further analysis of more data (which includes 8 types of facilities in 37 major Chinese cities) shows that the exponents of the power function do not have systematic variations across facilities and cities, which suggests the possibility that the scaling rule is universal. A double stochastic process (DSP) model is proposed such that the two empirical results can both be embedded. Simulation of DSP yields better agreement with the urban data than of the correlated percolation model.
Biologically Inspired Hierarchical Model for Feature Extraction and Localization
Liang Wu
Computer Science , 2006,
Abstract: Feature extraction and matching are among central problems of computer vision. It is inefficent to search features over all locations and scales. Neurophysiological evidence shows that to locate objects in a digital image the human visual system employs visual attention to a specific object while ignoring others. The brain also has a mechanism to search from coarse to fine. In this paper, we present a feature extractor and an associated hierarchical searching model to simulate such processes. With the hierarchical representation of the object, coarse scanning is done through the matching of the larger scale and precise localization is conducted through the matching of the smaller scale. Experimental results justify the proposed model in its effectiveness and efficiency to localize features.
Study on Reducing Leachate Production by Saw Powder Adding  [PDF]
Jun YIN, Baojun JIANG, Xiaoyan WU, Liang LIANG, Xue LIU
Journal of Water Resource and Protection (JWARP) , 2009, DOI: 10.4236/jwarp.2009.14034
Abstract: In order to study the effect of saw powder on leachate production, degradation of rubbish, COD and NH3-N concentration of leachate, three cylinder reactors for anaerobic landfill disposal were built to simulate the op-eration of landfill. In this experiment, leachate quantity, settling height of rubbish layer, COD and NH3-N concentration were monitored. The results come from experiment data analyses indicate that saw powder has strong effect on reducing leachate quantity and accelerating degradation of rubbish. In 60 days, saw powder mixed in rubbish layer can reduce 1200-1300mL leachate every liter rubbish, moreover, rubbish layer with saw powder mixed in settled more leachate than rubbish layer with no saw powder mixed in for 5cm. The ex-perimental results indicate that saw powder can reduce COD concentration of leachate and adsorb NH3-N, too.
Lightweight Behavior-Based Language for Requirements Modeling  [PDF]
Zhengping Liang, Guoqing Wu, Li Wan
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.33030
Abstract: Whether or not a software system satisfies the anticipated user requirements is ultimately determined by the behaviors of the software. So it is necessary and valuable to research requirements modeling language and technique from the perspective of behavior. This paper presents a lightweight behavior based requirements modeling language BDL with formal syntax and semantics, and a general-purpose requirements description model BRM synthesizing the concepts of viewpoint and scenario. BRM is good for modeling large and complex system due to its structure is very clear. In addition, the modeling process is demonstrated through the case study On-Line Campus Management System. By lightweight formal style, BDL & BRM can effectively bridge the gap between practicability and rigorousness of formal requirements modeling language and technique.
Single Parameter Entropy of Uncertain Variables  [PDF]
Jiajun Liu, Liang Lin, Shuai Wu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38131
Abstract: Uncertainty theory is a new branch of axiomatic mathematics for studying the subjective uncertainty. In uncertain theory, uncertain variable is a fundamental concept, which is used to represent imprecise quantities (unknown constants and unsharp concepts). Entropy of uncertain variable is an important concept in calculating uncertainty associated with imprecise quantities. This paper introduces the single parameter entropy of uncertain variable, and proves its several important theorems. In the framework of the single parameter entropy of uncertain variable, we can obtain the supremum of uncertainty of uncertain variable by choosing a proper q. The single parameter entropy of uncertain variable makes the computing of uncertainty of uncertain variable more general and flexible.
Risk Analysis of Gas Hydrate Formation during Deepwater Gas Well Testing  [PDF]
Hongjun Yang, Liang Hao, Muwang Wu
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.79080
Abstract: During deep-water gas wells testing period, predicting the generating zone of hydrate precisely in the whole flow range (bore holes and surface flow lines) is the key prerequisite of guarantee for testing flow. The unusual deep-water environment and low gas density make it easy to meet the conditions of hydrate generation during deep-water gas wells testing period, such as low temperature and high pressure, especially under the testing conditions, for instance, near mud line, surface chock line, low gas generating rate and surface shut-in. Wherefore, in view of all the operational modes during testing period (clean-out, variable rate flow, downhole and surface shut-in), based on temperature field of the whole flow range and phase equilibrium condition of hydrate, predicting method of hydrate generation zone is published; by taking enthalpy as the object of study, temperature calculation model increases the accuracy of temperature prediction; by integration of bore holes and surface lines, predicting plate of hydrate generation in the whole flow range is published. During flow period, the generating condition of hydrate is affected by rate of flow, and the lower the rate of flow is, the wider the hydrate generation zone is; during the stage of shut-in and initial flow, if pressure of strings is higher and temperature is lower, risk of hydrate generation will be greater and hydrate generation zone will be larger, so relevant actions should be taken to restrain hydrate generation.
Application of Perception Theory in Hotel Interior Design  [PDF]
Hui Yu, Ge Bai, Liang Wu
Open Journal of Applied Sciences (OJAppS) , 2018, DOI: 10.4236/ojapps.2018.87021
Abstract: The purpose of this article is to explore the application of perception theory in hotel interior design. Through the analysis of the theory of perception, the article sums up its connection with the interior design of Modern Hotel, and sums up the hotel interior design method under the influence of three factors of visual perception, space-time perception, logical perception so as to improve the level of humanization. Finally it will provide a basis for hotel interior design in the future.
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