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Search Results: 1 - 10 of 29392 matches for " Xing Gao "
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A Mathematical Interpretation of Hawking’s Black Hole Theory by Ricci Flow*  [PDF]
Qiaofang Xing, Xiang Gao
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.52029
Abstract:
In this paper, using Perelman’s no local collapsing theorem and the geometric interpretation of Hamilton’s Harnack expressions along the Ricci flow introduced by R. Hamilton, we present a mathematical interpretation of Hawking’s black hole theory in [1].
Molecular mechanisms of cell proliferation induced by low power laser irradiation
Xuejuan Gao, Da Xing
Journal of Biomedical Science , 2009, DOI: 10.1186/1423-0127-16-4
Abstract: Cell proliferation is a very important physiological effect for low power laser irradiation (LPLI) used in clinical practice. Increased proliferation after LPLI has been shown in many cell types in vitro, including fibroblasts from different systems [1-8], keratinocytes [9], human osteoblasts [10], calvaria osteoblast-like cells [11], lymphocytes [12], mesenchymal stem cells (MSCs) and cardiac stem cells (CSCs) [13], rat Schwann cells [14], aortic smooth muscle cell (SMC) [15], endothelial cells from veins [16] and arteries [17,18], quiescent satellite cells[19,20], human lung adenocarcinoma cells (ASTC-a-1) [21] and HeLa cells [22]. However, the mechanisms of cell proliferation induced by LPLI are poorly understood.Various mechanisms for the mitogenic effects of low power laser irradiation have been proposed, including ligand-free dimerization and activation of specific receptors that are in the "right energetic state" to accept the laser energy, leading to their autophosphorylation and downstream effects [23], activation of calcium channels resulting in increased intracellular calcium concentration and cell proliferation [24-30]. Red to near infrared light is thought to be absorbed by mitochondrial respiratory chain components, resulting in the increase of reactive oxygen species (ROS), and adenosine triphosphate (ATP)/or cyclic AMP, and initiating a signaling cascade which promotes cellular proliferation and cytoprotection [9,12,23,24,31-37]. Following increased ATP and protein synthesis after LPLI, the expressions of growth factors and cytokines increase and ultimately lead to cell proliferation [38,39]. Studies have also shown that light irradiation can alter cellular homeostasis parameters, such as pHi, the redox state of the cell, and expression of redox-sensitive factors like NF-κB, which can lead to a proliferation increase [23,40-42].Recently, a large number of signaling proteins reported play an important key role in the process of LPLI-induced cell proli
Constructions of free commutative integro-differential algebras
Xing Gao,Li Guo
Mathematics , 2014,
Abstract: In this survey, we outline two recent constructions of free commutative integro-differential algebras. They are based on the construction of free commutative Rota-Baxter algebras by mixable shuffles. The first is by evaluations. The second is by the method of Gr\"obner-Shirshov bases.
Top-quark forward-backward asymmetry in e+e- annihilation at NNLO in QCD
Jun Gao,Hua Xing Zhu
Physics , 2014, DOI: 10.1103/PhysRevLett.113.262001
Abstract: We report on a complete calculation of electroweak production of top quark pairs in $e^+e^-$ annihilation at next-to-next-to-leading order in Quantum Chromodynamics. Our setup is fully differential and can be used to calculate any infrared-safe observable. Especially we calculated the next-to-next-to-leading order corrections to top-quark forward-backward asymmetry and found sizable effects. Our results show a large reduction of the theoretical uncertainties in predictions of the forward-backward asymmetry, and allow a precision determination of the top quark electroweak couplings at future $e^+e^-$ colliders.
Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry  [PDF]
Fengqi Zhao, Xiaoling Xing, Chuan Xiao, Rongzu Hu, Liang Xue, Hongxu Gao, Libai Xiao, Ting An
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22033
Abstract: An exothermic reaction between MgB2 and water was observed in our laboratory at high temperature, although no obvious reaction occurred at room temperature. The reaction process of MgB2 and water was therefore studied by using microcalorimetry. The results showed that the reaction enthalpies of MgB2 with water and the formation enthalpies of MgB2 at T = (323.15, 328.15, 333.15 and 338.15) K are (–313.15, –317.85, –322.09, –329.27) kJ?mol–1, and (–238.96, –237.73, –236.50, –234.30) kJ●mol–1, respectively. The standard enthalpy of formation and standard molar heat capacity of MgB2 obtained by extrapolation method are –245.11 kJ●mol–1 and 246 J●mol–1●K–1, respectively. The values of activation energy E, pre-exponential factor A and the reaction order for the reaction of MgB2 and water over the temperature range from 323.15 K to 338.15 K are 50.80 kJ●mol–1, 104.78 s–1 and about 1.346, respectively. The positive values of ΔG and ΔH and negative value of ΔS indicate that the reaction can take place easily above 314.45 K.
Pyrrolidine-2,5-dione
Min Yu,Xing Huang,Feng Gao
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812035672
Abstract: In the title compound, C4H5NO2, the non-H atoms are nearly coplanar, with a maximum deviation of 0.030 (1) . In the crystal, pairs of molecules are linked by N—H...O hydrogen bonds into inversion dimers.
Diphoton excess at 750 GeV: gluon-gluon fusion or quark-antiquark annihilation?
Jun Gao,Hao Zhang,Hua Xing Zhu
Physics , 2015,
Abstract: Recently, ATLAS and CMS collaboration reported an excess in the diphoton events, which can be explained by a new resonance with mass around 750 GeV. In this work, we explored the possibility of identifying if the hypothetical new resonance is produced through gluon-gluon fusion or quark-antiquark annihilation, or tagging the beam. Three different observables for beam tagging, namely the rapidity and transverse momentum distribution of the diphoton, and one tagged bottom-jet cross section, are proposed. Combining the information gained from these observables, a clear distinction of the production mechanism for the diphoton resonance is promising.
Construction of free commutative integro-differential algebras by the method of Gr?bner-Shirshov bases
Xing Gao,Li Guo,Shanghua Zheng
Mathematics , 2013,
Abstract: In this paper, we construct a canonical linear basis for free commutative integro-differential algebras by applying the method of Gr\"obner-Shirshov bases. We establish the Composition-Diamond Lemma for free commutative differential Rota-Baxter algebras of order $n$. We also obtain a weakly monomial order on these algebras, allowing us to obtain Gr\"{o}bner-Shirshov bases for free commutative integro-differential algebras on a set. We finally generalize the concept of functional derivations to free differential algebras with arbitrary weight and generating sets from which to construct a canonical linear basis for free commutative integro-differential algebras.
A Framework for Transceiver Designs for Multi-Hop Communications with Covariance Shaping Constraints
Chengwen Xing,Feifei Gao,Yiqing Zhou
Mathematics , 2014,
Abstract: For multiple-input multiple-output (MIMO) transceiver designs, sum power constraint is an elegant and ideal model. When various practical limitations are taken into account e.g., peak power constraints, per-antenna power constraints, etc., covariance shaping constraints will act as an effective and reasonable model. In this paper, we develop a framework for transceiver designs for multi-hop communications under covariance shaping constraints. Particularly, we focus on multi-hop amplify-and-forward (AF) MIMO relaying communications which are recognized as a key enabling technology for device-to-device (D2D) communications for next generation wireless systems such as 5G. The proposed framework includes a broad range of various linear and nonlinear transceiver designs as its special cases. It reveals an interesting fact that the relaying operation in each hop can be understood as a matrix version weighting operation. Furthermore, the nonlinear operations of Tomolision-Harashima Precoding (THP) and Decision Feedback Equalizer (DFE) also belong to the category of this kind of matrix version weighting operation. Furthermore, for both the cases with only pure shaping constraints or joint power constraints, the closed-form optimal solutions have been derived. At the end of this paper, the performance of the various designs is assessed by simulations.
On Rings of Differential Rota-Baxter Operators
Xing Gao,Li Guo,Markus Rosenkranz
Mathematics , 2015,
Abstract: Using the language of operated algebras, we construct and investigate a class of operator rings and enriched modules induced by a derivation or Rota-Baxter operator. In applying the general framework to univariate polynomials, one is led to the integro-differential analogs of the classical Weyl algebra. These are analyzed in terms of skew polynomial rings and noncommutative Groebner bases.
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