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Search Results: 1 - 10 of 286189 matches for " Liu L "
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Multiplicity of Solutions for a Class of Fourth-Order Elliptic Problems with Asymptotically Linear Term
Qiong Liu,Dengfeng Lü
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/749059
Abstract: We study the following fourth-order elliptic equations: Δ2
Discussion on measurement and calculation principle of petrogenetic depth
Guxian Lü,Ruixun Liu
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885942
Abstract: Geologic and geophysical data certificate that lithosphere and its down rock behave as solid, therefore, it is better to measure petrogenetic and metallogenetic depth according to internal stress of solid states. Lithomechanic experiment found that the bigger the confining pressure, the bigger the tensile and shear strength of rocks,so rock can bear very high differential stress but it is not broken. Sibson put forward that the property of rocks under 10–15km of the surface changes from brittle to ductile (rather than from elastic to plastic). Rock with ductile deformation is still solid with elasticity, and it is not in the hydrostatic pressure state. Now ingored differential stress has already been measured at deeper place, it cannot be used to measure depth with the static fluid model but with the elastic model for lack of rheological experiment data. The more correct depth could be calculated by the elastic model rather than the static fluid model. It is an advance to describe rock property with the viscoelastic or elastic-viscosity model, but it is not the progress to come back to the static fluid model from the elastic model. Generally speaking, isotropic equante normal stress in the tectonic stress field, namely tectono-original additional hydrostatic pressure is one order of magnitute more than differential stress in the tectonic stress field, which, superimposed on additional hydrostatic stress of gravity, will bring about ultrahigh pressure metamorphism (UHPM), no matter how big the differential stress is.
Improving patient outcomes: role of the primary care optometrist in the early diagnosis and management of age-related macular degeneration
Liu L, Swanson M
Clinical Optometry , 2013, DOI: http://dx.doi.org/10.2147/OPTO.S29932
Abstract: oving patient outcomes: role of the primary care optometrist in the early diagnosis and management of age-related macular degeneration Review (466) Total Article Views Authors: Liu L, Swanson M Video abstract presented by Mark Swanson Views: 11 Published Date February 2013 Volume 2013:5 Pages 1 - 12 DOI: http://dx.doi.org/10.2147/OPTO.S29932 Received: 12 September 2012 Accepted: 23 October 2012 Published: 19 February 2013 Lei Liu, Mark Swanson School of Optometry, University of Alabama at Birmingham, Birmingham, AL, USA Abstract: Not long ago, the management of age-related macular degeneration (AMD) was confined to rehabilitating whatever vision had not been damaged by the disease. The recent successes of the anti-vascular endothelial growth factor agents and the antioxidant clinical trials have revolutionized AMD treatment. For the first time, there is realistic hope that the progression of AMD can be slowed down or stopped and near normal vision can be preserved. Developments in new vision tests, imaging modalities, and genetic testing have greatly improved the chance of detecting the onset of AMD and choroidal neovascularization. However, because the current treatments still cannot revive degenerated retinal cells, the best patient outcome that can be achieved is early detection of the disease and application of the appropriate treatment before too much retinal damage has occurred. The opportunities and challenges offered by the new treatment options and disease detection methods have redefined the role of primary care optometrists in AMD management. This review of literature and practice guidelines demonstrates that, in addition to the traditional roles of refraction and visual rehabilitation, the unique position of optometrists as the first-line eye-care providers has allowed them to play an important role in the early detection of AMD, patient education, lifestyle-change counseling, disease monitoring and referral, and nutrition supplement counseling. The active participation of primary care optometrists in the shared care of AMD management is likely to result in great improvement in patient outcomes. Optometrists also need to improve their competence in these areas to meet the new challenges. Although primary care optometrists have always managed patients with AMD, their role in managing this sight-threatening disease has not been adequately documented. In light of the recent game-changing developments in AMD treatment, it is important to review what primary care optometrists are doing, what they can do, and what they should do to improve patient outcomes in the new era of AMD management.
China Banking Market Structure and Performance:Based on Panel Data 2000-2010
Zhengchao Lü,Qin LIU
International Business and Management , 2012, DOI: 10.3968/j.ibm.1923842820120502.1045
Abstract: This paper is devoted to analyzing the relationship between China banking market structure and performance. We employ the methodology of SCP (structure-conduct-performance), introduce macro economics factors into regression model and use the panel data of 14 major commercial banks in China Mainland from 2000 to 2010. The results show that China banking market is still in the oligopoly status, and the oligopoly degree reduces gradually over time. The oligopoly degree has a negative correlation with the performance. The deposit-loan ratio and the capital adequacy ratio have both positive correlations with the performance. We propose four advises for reducing the oligopoly degree and improving banking industry. They are (1) Reducing great banks network externalities barriers; (2) Drawing private capital invests into the banking industry; (3) Slackening restrictions to foreign banks; (4) Developing the market of small-micro enterprises loan. Key words: Market structure; Banking performance; Oligopoly; China
Improving patient outcomes: role of the primary care optometrist in the early diagnosis and management of age-related macular degeneration
Liu L,Swanson M
Clinical Optometry , 2013,
Abstract: Lei Liu, Mark SwansonSchool of Optometry, University of Alabama at Birmingham, Birmingham, AL, USAAbstract: Not long ago, the management of age-related macular degeneration (AMD) was confined to rehabilitating whatever vision had not been damaged by the disease. The recent successes of the anti-vascular endothelial growth factor agents and the antioxidant clinical trials have revolutionized AMD treatment. For the first time, there is realistic hope that the progression of AMD can be slowed down or stopped and near normal vision can be preserved. Developments in new vision tests, imaging modalities, and genetic testing have greatly improved the chance of detecting the onset of AMD and choroidal neovascularization. However, because the current treatments still cannot revive degenerated retinal cells, the best patient outcome that can be achieved is early detection of the disease and application of the appropriate treatment before too much retinal damage has occurred. The opportunities and challenges offered by the new treatment options and disease detection methods have redefined the role of primary care optometrists in AMD management. This review of literature and practice guidelines demonstrates that, in addition to the traditional roles of refraction and visual rehabilitation, the unique position of optometrists as the first-line eye-care providers has allowed them to play an important role in the early detection of AMD, patient education, lifestyle-change counseling, disease monitoring and referral, and nutrition supplement counseling. The active participation of primary care optometrists in the shared care of AMD management is likely to result in great improvement in patient outcomes. Optometrists also need to improve their competence in these areas to meet the new challenges. Although primary care optometrists have always managed patients with AMD, their role in managing this sight-threatening disease has not been adequately documented. In light of the recent game-changing developments in AMD treatment, it is important to review what primary care optometrists are doing, what they can do, and what they should do to improve patient outcomes in the new era of AMD management.Keywords: detection, patient education, lifestyle-change counseling, disease monitoring, disease referral, nutrition supplement counseling
The width of the ξ(2230) meson
L. C. Liu
Physics , 2002, DOI: 10.1016/S0370-2693(02)01232-7
Abstract: A lower bound of 135 MeV for the width of the \xi meson is obtained from analyzing the pp and pbar-p interactions by use of Regge theory. The pp data exclude a narrow \xi as the latter would lead to total pbar-p cross sections far exceeding the measured ones. The broad width explains why the \xi may not be seen in pbarp-p experiments.
Model of cell response to α-particle radiation
L. J. Liu
Physics , 2012,
Abstract: Starting from a general equation for organism (or cell system) growth and attributing additional cell death rate (besides the natural rate) to therapy, we derive an equation for cell response to {\alpha} radiation. Different from previous models that are based on statistical theory, the present model connects the consequence of radiation with the growth process of a biosystem and each variable or parameter has meaning regarding the cell evolving process. We apply this equation to model the dose response for {\alpha}-particle radiation. It interprets the results of both high and low linear energy transfer (LET) radiations. When LET is high, the additional death rate is a constant, which implies that the localized cells are damaged immediately and the additional death rate is proportional to the number of cells present. While at low LET, the additional death rate includes a constant term and a linear term of radiation dose, implying that the damage to some cell nuclei has a time accumulating effect. This model indicates that the oxygen-enhancement ratio (OER) decreases while LET increases consistently.
Impurity effect as a probe of the paring symmetry in BiS_{2} based superconductors
S. L. Liu
Physics , 2012, DOI: 10.1007/s10948-013-2237-x
Abstract: The impurity effects are studied for the BiS_{2}- layered superconductors based on a two orbital model with the Bogoliubov-de-Gennes technique. The superconducting critical temperature (T_{c}) as a function of the mpurity concentration is calculated. Significant reduction of T_{c} is found for spin singlet nearest-neighboring paring d-wave state and the spin triplet next-nearest-neighboring (NNN) paring p-wave state, while no depression of T_{c} for isotropic s-wave state. The single impurity effects for various paring states are also explored. The impurity resonance peak in the local density of states spectrum is found only for the d-wave state. For the spin triplet NNN paring p-wave state, two in-gap peaks occur in the case of positive impurity potential; and a single in-gap peak is found for the negative impurity potential, which shifts towards to lower energy with decreasing the potential strength. These results can be used to detect the paring symmetry of the BiS_{2}- based superconductors.
On the Equivariant Lazard Ring and Tom Dieck's Equivariant Cobordism Ring
C. L Liu
Mathematics , 2013,
Abstract: For a torus G of rank r = 1, we showed that the canonical ring homomorphism L_G \to MU_G, where L_G is the equivariant Lazard ring and MU_G is the equivariant cobordism ring introduced by Tom Dieck, is surjective. We also showed that the completion map MU_G \to \hat{MU}_G = MU(BG) is injective. Moreover, we showed that the same results hold if we assume a certain algebraic property holds in L_G when r \geq 2.
Properties and Applications of Programs with Monotone and Convex Constraints
L. Liu,M. Truszczynski
Computer Science , 2011, DOI: 10.1613/jair.2009
Abstract: We study properties of programs with monotone and convex constraints. We extend to these formalisms concepts and results from normal logic programming. They include the notions of strong and uniform equivalence with their characterizations, tight programs and Fages Lemma, program completion and loop formulas. Our results provide an abstract account of properties of some recent extensions of logic programming with aggregates, especially the formalism of lparse programs. They imply a method to compute stable models of lparse programs by means of off-the-shelf solvers of pseudo-boolean constraints, which is often much faster than the smodels system.
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