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Search Results: 1 - 10 of 47605 matches for " Chin-Tung Wu "
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The torsion flow on a closed pseudohermitian 3-manifold
Shu-Cheng Chang,Otto van Koert,Chin-Tung Wu
Mathematics , 2013,
Abstract: In this paper we define the torsion flow, a CR analogue of the Ricci flow. For homogeneous CR manifolds we give explicit solutions to the torsion flow illustrating various kinds of behavior. We also derive monotonicity formulas for CR entropy functionals. As an application, we classify torsion breathers.
A generalization of almost Schur lemma on CR manifolds
Jui-Tang Chen,Nguyen Thac Dung,Chin-Tung Wu
Mathematics , 2014,
Abstract: In this paper, we study a general almost Schur Lemma on pseudo-Hermitian (2n+1)-manifolds $(M,J,\theta)$ for $n\geq2$. When the equality of almost Schur inequality holds, we derive the contact form $\theta$ is pseudo-Einstein and the pseudo-Hermitian scalar curvature is constant.
On the CR Analogue of Reilly Formula and Yau Eigenvalue Conjecture
Shu-Cheng Chang,Chih-Wei Chen,Chin-Tung Wu
Mathematics , 2015,
Abstract: In this paper, we derive the CR Reilly's formula and its applications to studying of the first eigenvalue estimate for CR Dirichlet eigenvalue problem and embedded p-minimal hypersurfaces. In particular, we obtain the first Dirichlet eigenvalue estimate in a compact pseudohermitian (2n+1)-manifold with boundary and the first eigenvalue estimate of the tangential sublaplacian on closed oriented embedded p-minimal hypersurfaces in a closed pseudohermitian (2n+1)-manifold of vanishing torsion.
A Microfluidic Chip Using Phenol Formaldehyde Resin for Uniform-Sized Polycaprolactone and Chitosan Microparticle Generation
Yung-Sheng Lin,Chih-Hui Yang,Chin-Tung Wu,Alexandru Mihai Grumezescu,Chih-Yu Wang,Wan-Chen Hsieh,Szu-Yu Chen,Keng-Shiang Huang
Molecules , 2013, DOI: 10.3390/molecules18066521
Abstract: This study develops a new solvent-compatible microfluidic chip based on phenol formaldehyde resin (PFR). In addition to its solvent-resistant characteristics, this microfluidic platform also features easy fabrication, organization, decomposition for cleaning, and reusability compared with conventional chips. Both solvent-dependent (e.g., polycaprolactone) and nonsolvent-dependent (e.g., chitosan) microparticles were successfully prepared. The size of emulsion droplets could be easily adjusted by tuning the flow rates of the dispersed/continuous phases. After evaporation, polycaprolactone microparticles ranging from 29.3 to 62.7 μm and chitosan microparticles ranging from 215.5 to 566.3 μm were obtained with a 10% relative standard deviation in size. The proposed PFR microfluidic platform has the advantages of active control of the particle size with a narrow size distribution as well as a simple and low cost process with a high throughput.
Conformal Surface Morphing with Applications on Facial Expressions
Mei-Heng Yueh,Xianfeng David Gu,Wen-Wei Lin,Chin-Tien Wu,Shing-Tung Yau
Computer Science , 2015,
Abstract: Morphing is the process of changing one figure into another. Some numerical methods of 3D surface morphing by deformable modeling and conformal mapping are shown in this study. It is well known that there exists a unique Riemann conformal mapping from a simply connected surface into a unit disk by the Riemann mapping theorem. The dilation and relative orientations of the 3D surfaces can be linked through the M\"obius transformation due to the conformal characteristic of the Riemann mapping. On the other hand, a 3D surface deformable model can be built via various approaches such as mutual parameterization from direct interpolation or surface matching using landmarks. In this paper, we take the advantage of the unique representation of 3D surfaces by the mean curvatures and the conformal factors associated with the Riemann mapping. By registering the landmarks on the conformal parametric domains, the correspondence of the mean curvatures and the conformal factors for each surfaces can be obtained. As a result, we can construct the 3D deformation field from the surface reconstruction algorithm proposed by Gu and Yau. Furthermore, by composition of the M\"obius transformation and the 3D deformation field, the morphing sequence can be generated from the mean curvatures and the conformal factors on a unified mesh structure by using the cubic spline homotopy. Several numerical experiments of the face morphing are presented to demonstrate the robustness of our approach.
Uniqueness of Traveling Waves for a Two-Dimensional Bistable Periodic Lattice Dynamical System
Chin-Chin Wu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/289168
Abstract: We study traveling waves for a two-dimensional lattice dynamical system withbistable nonlinearity in periodic media. The existence and the monotonicity in time oftraveling waves can be derived in the same way as the one-dimensional lattice case. In thispaper, we derive the uniqueness of nonzero speed traveling waves by using the comparisonprinciple and the sliding method.
Global QCD Analysis, the Gluon Distribution, and High $E_t$ Inclusive Jet Data
Wu-Ki Tung
Physics , 1996,
Abstract: We report on an extensive global QCD analysis of new DIS and hadronic inclusive jet production data emphasizing the impact of these recent data on the determination of the gluon distribution, and on the interpretation of the high $E_t$ jets highlighted by the CDF collaboration. This analysis results in (i) a better handle on the range of uncertainty of the gluon distribution, (ii) a new generation of CTEQ parton distributions which incorporates this uncertainty, (iii) a viable scenario for accommodating the high $E_t$ jets in the conventional pQCD framework, and (iv) a systematic study of the sensitivity of the various hard processes to $\alpha_s$ and the consistency of $\alpha_s$ determination in global analysis.
The Heavy Quark Parton Oxymoron -- A mini-review of Heavy Quark Production theory in PQCD
Wu-Ki Tung
Physics , 1997, DOI: 10.1063/1.53735
Abstract: Conventional perturbative QCD calculations on the production of a heavy quark ``$H$'' consist of two contrasting approaches: the usual QCD parton formalism uses the zero-mass approximation ($m_H=0$) once above threshold, and treats $H$ just like the other light partons; on the other hand, most recent ``NLO'' heavy quark calculations treat $m_H$ as a % large parameter and always consider $H$ as a heavy particle, never as a parton, irrespective of the energy scale of the physical process. By their very nature, both these approaches are limited in their regions of applicability. This dichotomy can be resolved in a unified general-mass variable-flavor-number scheme, which retains the $m_H$ dependence at all energies, and which naturally reduces to the two conventional approaches in their respective region of validity. Recent applications to lepto- and hadro-production of heavy quarks are briefly summarized.
Photoactivation Studies of Zinc Porphyrin-Myoglobin System and Its Application for Light-Chemical Energy Conversion
Chin-Hao Chang, Yi-Ting Hu, Chen-Fu Lo, Liyang Luo, Hung-Ming Lin, Cheng-Hsiang Chang, Ching-Yao Lin, Eric Wei-Guang Diau, Tung-Kung Wu
International Journal of Biological Sciences , 2011,
Abstract: An artificial zinc porphyrin-myoglobin-based photo-chemical energy conversion system, consisting of ZnPP-Mb or ZnPE1-Mb as a photosensitizer, NADP+ as an electron acceptor, and triethanolamine as an electron donor, has been constructed to mimic photosystem I. The photoirradiated product is able to reduce a single-electron acceptor protein cytochrome c, but cannot catalyze the two-electron reduction of acetaldehyde by alcohol dehydrogenase, thus demonstrating a single electron transfer mechanism. Furthermore, the artificial system can bifunctionally promote oxidoredox reactions, depending on the presence or absence of a sacrificial electron donor, thus suggesting its potential application in electrochemical regeneration steps involved in chemical transformation and/or energy conversion.
Knowledge Integration in ISD Project Teams: A Transactive Memory Perspective  [PDF]
Tung-Ching Lin, Kuang-Ting Cheng, Sheng Wu
Open Journal of Business and Management (OJBM) , 2014, DOI: 10.4236/ojbm.2014.24042
Abstract: Many organizations frequently establish information system development (ISD) project teams in order to solve specific problems. Knowledge tends to be stored within individuals who are often dispersed over time. However, knowledge integration is required to solve new types of problems. The transactive memory system (TMS) has been suggested as a critical mechanism for facilitating knowledge integration as part of the team’s processes. TMS can help the knowledge team to recognize the presence of individuals with diverse knowledge and optimize their value. In this paper, we use TMS and the concept of “collective mind” to explain how the team members’ heedful inter-relations and mindful comprehension function within the social system. We also discuss in detail how antecedent factors affect TMS. Drawing on data from a study of 339 part-time MBA students who were members of knowledge teams, the findings of this research showed that all our hypotheses were statically significant. Discussions and implications for academics and practitioners are provided.
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