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Search Results: 1 - 10 of 42139 matches for " Tao Zhu "
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"Charged" Particle's Tunneling from Rotating Black Holes
Tao Zhu
Physics , 2011, DOI: 10.1007/s10714-012-1354-3
Abstract: The behavior of a scalar field theory near the event horizon in a rotating black hole background can be effectively described by a two dimensional field theory in a gauge field background. Based on this fact, we proposal that the quantum tunneling from rotating black hole can be treated as "charged" particle' s tunneling process in its effectively two dimensional metric. Using this viewpoint and considering the corresponding "gauge charge" conservation, we calculate the non-thermal tunneling rate of Kerr black hole and Myers-Perry black hole, and results are consistent with Parikh-Wilczek's original result for spherically symmetric black holes. Especially for Myers-Perry black hole which has multi-rotation parameters, our calculation fills in the gap existing in the literature applying Parikh-Wilczek's tunneling method to various types black holes. Our derivation further illuminates the essential role of effective gauge symmetry in Hawking radiation from rotating black holes.
Evaluation of Land Ecological Safety Based on Fuzzy Matter-Element Theory
Jiulong Zhu,Xiaoyan Tao
Journal of Computers , 2011, DOI: 10.4304/jcp.6.12.2639-2646
Abstract: Study on land ecological safety has become a forefront topic of regional sustainable development. The paper constructed an evaluation index system of land ecological safety. Then it discussed the ranges of indexes corresponding to each evaluation grade. Considering the illegibility and uncertainty in land ecological safety evaluation, the paper combined fuzzy matter-element and entropy method to establish an evaluation model of land ecological safety. Then it developed a case study on Hebei Province. The results show that there is a tendency of gradual improvement. Conditions of land ecological safety of 2000 and 2001 belong to relatively unsafe grade and the other six years belong to critically safe grade. Land ecological safety conditions of Hebei Province from 2000 to 2007 are unsatisfactory and need to be improved. The results can reflect the real conditions of land ecosystem of Hebei Province.
Applied Research of ETFE Membrane Gas Pillow Structure in Modern Stadiums
Tao Yu,Yanhui Zhu
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: The ETFE membrane structure is a new type of building materials, compared to traditional wall material, which has a more significant advantages and modern forms of spatial structure and it will be trend to replace traditional materials. This study, using literature data, based on analysis of the ETFE cushions structure graphics and ETFE materials characteristics, taking the Beijing Water Cube Aquatics Centre as main case, focuses on the ETFE membrane structure of the basic information and this material in the field of sports building design principles and installation methods in order to promote the application of the ETFE membrane material in the field of sports building.
The Study of Cooperation among Circum-Bohai-Sea Region
Tao Ma,Chunhong Zhu
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v3n1p128
Abstract: The Circum-Bohai-Sea region is the third strategic economical circle after "the Pearl River delta region" and "the Yangtze River delta region". This paper analyzes competitive abilities of this region from many aspects. And then it points out the structure development pattern: 3C pattern ("core","circle","crowd"), the paper provides theoretical and actual operation basis for conforming competitive abilities and speeding up development in Circum-Bohai-Sea region.
Empirical Study on the Influence of Social Capital to Informal Knowledge Transfer among Individuals
Zhihong Li,Tao Zhu
Journal of Software , 2009, DOI: 10.4304/jsw.4.4.291-298
Abstract: Informal knowledge transfer among individuals is a crucial section of organization knowledge management. Based on theories of knowledge transfer, the hypotheses of influence of social capital to informal knowledge transfer among individuals were proposed. By empirical study, this paper verified and revised the model, and revealed that three dimensions of social capital not only have a direct significant effect on informal knowledge transfer performance among individuals, but also have an indirect effect on the informal knowledge transfer performance among individuals by impacting on knowledge transfer opportunities, motives and ability respectively. The results obtained in this study can provide some useful guidance for organizations to enhance knowledge innovation by the promotion of informal knowledge transfer among individuals.
Gravitational quantum effects in the light of BICEP2 results
Tao Zhu,Anzhong Wang
Physics , 2014, DOI: 10.1103/PhysRevD.90.027304
Abstract: Recently BICEP2 found that the vanishing of the tensor-to-scalar ratio $r$ is excluded at $7\sigma$ level, and its most likely value is $r=0.2^{+0.07}_{-0.05}$ at $1 \sigma$ level. This immediately causes a tension with the Planck constraint $r < 0.11$. In addition, it also implies that the inflaton (in single field slow-roll inflation) experienced a Planck excursion during inflation $\Delta\phi /M_{Pl} \geq {\cal{O}}(1)$, whereby the effective theory of inflation becomes questionable. In this brief report, we show that the inflationary paradigm is still robust, even after the quantum effects are taken into account. Moreover, these effects also help to relax the tension on the different values of $r$ given by BICEP2 and Planck.
Wavelength Spacing Tunable, Multiwavelength Q-switched Fiber Laser Mode-locked by Graphene Oxide
Lei Gao,Tao Zhu
Physics , 2014,
Abstract: We demonstrate a wavelength spacing tunable, multiwavelength Q-switched mode-locked fiber laser (QML) based on a fiber taper deposited with graphene oxide. The operation of the laser can be understood in terms of the formation of bunches of QMLs which possess small temporal intervals, and multiwavelength spectra are generated due to the Fourier transformation. We find that the temporal spacing of the QMLs is highly sensitive to the pump power, and as a result, the wavelength spacing can be easily tuned by varying the pump power. Our experimental laser provides a wavelength spacing tuning range from ~0.001 nm to 0.145 nm with a pump power variation less than 10 mW. The laser could be developed into a low lost wavelength spacing tunable optical source for a wide range of applications, such as spectroscopy, microwave/terahertz signal generation, optical metrology, optical communications and sensing.
Voting for Deceptive Opinion Spam Detection
Tao Wang,Hua Zhu
Computer Science , 2014,
Abstract: Consumers' purchase decisions are increasingly influenced by user-generated online reviews. Accordingly, there has been growing concern about the potential for posting deceptive opinion spam fictitious reviews that have been deliberately written to sound authentic, to deceive the readers. Existing approaches mainly focus on developing automatic supervised learning based methods to help users identify deceptive opinion spams. This work, we used the LSI and Sprinkled LSI technique to reduce the dimension for deception detection. We make our contribution to demonstrate what LSI is capturing in latent semantic space and reveal how deceptive opinions can be recognized automatically from truthful opinions. Finally, we proposed a voting scheme which integrates different approaches to further improve the classification performance.
Research on Evolution Mechanism of Technological Original Innovation—With Mutation Theory of Respective  [PDF]
Zhi-Ming Zhu, in-Sheng Li, Tao Chen
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.51004
Abstract: Technical innovation is the power and resource for the sustainable and healthy development of enterprises, and is re- lated to the improvement of social productivity and the establishment and improvement of national innovation system. Technical innovation is the process of the enterprise using the original knowledge and transforming it into new tech- nology. The input and output of knowledge of (i.e., creating new technology) presents S curve, experiencing the stage of imitating type, fusion type and original type, which is subjected to the synergistic action of institutional arrangements factor and its operating factors. Through the analysis of evolution mechanism of different stages of technological inno- vation stages, this paper verifies the rationality and scientific nature of the theoretical assumptions.
Patient Perceptions of Current Disease Control in Poorly Controlled Diabetes  [PDF]
Anjali Gopalan, Haley Moss, Yuanyuan Tao, Jingsan Zhu, Kevin Volpp
Health (Health) , 2014, DOI: 10.4236/health.2014.615230
Abstract: Background: Studies suggest that patients do not understand the hemoglobin A1c value (A1c). However, clinicians may communicate information about glycemic control in other ways. Given this, this study evaluates patients’ understanding of current diabetes control, independent of the A1c, and the factors affecting this understanding. Method: Cross-sectional survey of patients with poorly controlled diabetes seen in urban clinics in fall of 2010. Results: 177 people completed the survey. 73.5% were women, 83.0% were African-American and the average age was 56.5 years. 80.2% of respondents reported having had diabetes for at least five years. 39% reported past participation in a diabetes education course. Average A1c was 9.9(S.D. 1.7)%; no differences were noted based on income, education, disease duration, or complication history. 23.7% described their disease control as “good” or “excellent” in spite of an average A1c of 9.5% (1.2). Notably, most of this group reported diabetes for over five years and did not differ in history of diabetes-related complications or educational attainment compared to those with more accurate perceptions of control. Conclusion: The high proportion of participants who reported “good” or “excellent” control in spite of mean A1c greater than 9.5% raises serious questions about the effectiveness of current communication methods for patients with poorly controlled diabetes.
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