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Search Results: 1 - 10 of 48453 matches for " ZHOU Xiang "
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Internet-Future Business Development Focus  [PDF]
Xiang Fang, Yangping Zhou
American Journal of Industrial and Business Management (AJIBM) , 2012, DOI: 10.4236/ajibm.2012.23011
Abstract: The paper compares the characteristics of traditional business model to future business model development. Internet will be the most important growth point on business development. With the internet business growth and development or the potential customers growth, future business development and enlargement should be focused. The relevant contents discussion will be good to the future business development.
Winter prevalence of obligate aphid pathogen Pandora neoaphidis mycosis in the host Myzus persicae populations in southern China: modeling description and biocontrol implication
Zhou, Xiang;
Brazilian Journal of Microbiology , 2012, DOI: 10.1590/S1517-83822012000100038
Abstract: pandora neoaphidis overwintering had been investigated by monitoring its prevalence in myzus persicae populations in open fields. cabbage plants in field plots were weekly taken after mycosis initiation, to count and examine the living and dead aphids infected by p. neoaphidis. based on the field data, infection levels (i) varied with field temperature (t), relative humidity (rh) and aphid count (numbers of living aphids per plant, n) over days (d), fitting well to the modified logistic equation i=0.91/[1+exp(8.5+(2.0hthrh-20.2ni0)d)] (r2=0.897), where ht indicated daily hours of low temperature (<4°c), hrh daily hours of high air humidity (>90% rh) and i0 primary infection level. the model demonstrated the abiotic and biotic factors influencing p. neoaphidis mycosis development in winter, and also verifies the fungal overwintering by infecting available host aphids without a resting stage. ultimately, p. neoaphidis mycosis reduced 81.4% of aphid populations, presenting great potential for biocontrol.
Q&A: What is biophysics?
Huan-Xiang Zhou
BMC Biology , 2011, DOI: 10.1186/1741-7007-9-13
Abstract: Physics provides the fundamental theories for understanding biomolecules. For example, statistical mechanics, a cornerstone of modern physics, is also the foundation for understanding the behaviors of biomolecular systems. Electron transfer within protein matrices, which drives respiration and photosynthesis, can only be understood with the help of quantum mechanics. In essence, an electron can hop from one position to another within a protein matrix only when the energy levels before and after the hop are equal.Importantly, many of the powerful tools for investigating biomolecules were initiated by physicists. X-ray crystallography provides a telling example. X-rays were discovered by Wilhelm R?ntgen (1901 Nobel Prize in Physics) and their diffraction by crystals was first demonstrated by Max von Laue (1914 Nobel Prize in Physics). The subsequent mathematical formulation of the diffraction pattern by the Braggs, father and son (1915 Nobel Prize in Physics), ushered in the new field of X-ray crystallography. This made possible the determination of the first protein structures by Max Perutz and John Kendrew (1962 Nobel Prize in Chemistry), the structure of DNA by Francis Crick, James Watson, and Maurice Wilkins (1962 Nobel Prize in Physiology or Medicine), and the structures of the photosynthetic reaction center (1988 Nobel Prize in Chemistry), ion channels (2003 Nobel Prize in Chemistry), RNA polymerase II (2006 Nobel Prize in Chemistry), and the ribosome (2009 Nobel Prize in Chemistry). Similar paths can be traced for nuclear magnetic resonance spectroscopy (1943, 1944, and 1962 Nobel Prizes in Physics; 1991 and 2002 Nobel Prizes in Chemistry; and 2003 Nobel Prize in Physiology or Medicine), atomic force microscopy (1986 Nobel Prize in Physics), electron microscopy (1986 Nobel Prize in Physics), and single-molecule techniques such as optical tweezers (1997 Nobel Prize in Physics).Many computational techniques - for example, molecular dynamics simulation - that are
The debut of PMC Biophysics
Huan-Xiang Zhou
BMC Biophysics , 2008, DOI: 10.1186/1757-5036-1-1
Abstract: Firstly, the open access movement is gathering strength. Pioneered by PMC Biophysics's parent company, BioMed Central, open access allows any reader immediate free access to published articles, encouraging the widest possible spread of knowledge. Archiving in multiple repositories ensures the long-term preservation of scientific research, and electronic publication enables the inclusion of multimedia content and the dissemination of raw data - allowing other researchers to exploit them. All these features serve to enhance the impact of published articles.The strength and future success of open access are heralded by two major recent developments. The US National Institutes of Health, the largest public funding agency for biomedical research, now requires that all peer-reviewed journal articles arising from NIH funding be made open access within 12 months of publication. In addition, BioMed Central has recently been acquired by Springer, the world's second largest publisher of scientific journals.The second trend concerns the multidisciplinary nature of research in biological physics.Over the past 40 years, the field of biological physics has been shaped by forces from two directions. On one hand, the study of biological systems has become less and less descriptive and more and more quantitative. It has become more compelling to model biological systems and rationalise or predict behaviours from physical principles, such as in protein folding.On the other hand, it has been discovered time and again that models and techniques developed for simple physical systems eventually become powerful tools for studying biological systems – Born's model for ion solvation and Kramers' rate theory for barrier crossing being classic examples. X-ray crystallography and computer simulations both started from humble beginnings, but are now used to study ever larger biomacromolecular complexes. The end result is that biological physics is now a thriving area for researchers from a wide
Is Treatment with Trimetazidine Beneficial in Patients with Chronic Heart Failure?
Xiang Zhou, Jianchang Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094660
Abstract: Background Whether additional benefit can be achieved with the use of trimetazidine (TMZ) in patients with chronic heart failure (CHF) remains controversial. We therefore performed a meta-analysis of randomized controlled trials (RCTs) to evaluate the effects of TMZ treatment in CHF patients. Methods We searched PubMed, EMBASE, and Cochrane databases through October 2013 and included 19 RCTs involving 994 CHF patients who underwent TMZ or placebo treatment. Risk ratio (RR) and weighted mean differences (WMD) were calculated using fixed or random effects models. Results TMZ therapy was associated with considerable improvement in left ventricular ejection fraction (WMD: 7.29%, 95% CI: 6.49 to 8.09, p<0.01) and New York Heart Association classification (WMD: ?0.55, 95% CI: ?0.81 to ?0.28, p<0.01). Moreover, treatment with TMZ also resulted in significant decrease in left ventricular end-systolic volume (WMD: ?17.09 ml, 95% CI: ?20.15 to ?14.04, p<0.01), left ventricular end-diastolic volume (WMD: ?11.24 ml, 95% CI: ?14.06 to ?8.42, p<0.01), hospitalization for cardiac causes (RR: 0.43, 95% CI: 0.21 to 0.91, p = 0.03), B-type natriuretic peptide (BNP; WMD: ?157.08 pg/ml, 95% CI: ?176.55 to ?137.62, p<0.01) and C-reactive protein (CRP; WMD: ?1.86 mg/l, 95% CI: ?2.81 to ?0.90, p<0.01). However, there were no significant differences in exercise duration and all-cause mortality between patients treated with TMZ and placebo. Conclusions TMZ treatment in CHF patients may improve clinical symptoms and cardiac function, reduce hospitalization for cardiac causes, and decrease serum levels of BNP and CRP.
Darboux transformations for two dimensional elliptic affine Toda equations
Zi-Xiang Zhou
Physics , 2009,
Abstract: The Darboux transformations for the two dimensional elliptic affine Toda equations corresponding to all seven infinite series of affine Kac-Moody algebras, including $A_l^{(1)}$, $A_{2l}^{(2)}$, $A_{2l-1}^{(2)}$, $B_l^{(1)}$, $C_l^{(1)}$, $D_l^{(1)}$ and $D_{l+1}^{(2)}$, are presented. The Darboux transformation is constructed uniformly for the latter six series of equations with suitable choice of spectral parameters and the solutions of the Lax pairs so that all the reality symmetry, cyclic symmetry and complex orthogonal symmetry of the corresponding Lax pairs are kept invariant. The exact solutions of all these two dimensional elliptic affine Toda equations are obtained by using Darboux transformations.
Relation between hyperbolic Nizhnik-Novikov-Veselov equation and stationary Davey-Stewartson II equation
Zi-Xiang Zhou
Physics , 2008, DOI: 10.1088/0266-5611/25/2/025003
Abstract: A Lax system in three variables is presented, two equations of which form the Lax pair of the stationary Davey-Stewartson II equation. With certain nonlinear constraints, the full integrability condition of this Lax system contains the hyperbolic Nizhnik-Novikov-Veselov equation and its standard Lax pair. The Darboux transformation for the Davey-Stewartson II equation is used to solve the hyperbolic Nizhnik-Novikov-Veselov equation. Using Darboux transformation, global $n$-soliton solutions are obtained. It is proved that each $n$-soliton solution approaches zero uniformly and exponentially at spatial infinity and is asymptotic to $n^2$ lumps of peaks at temporal infinity.
An observation on the relation between the fine structure constant and the Gibbs phenomenon in Fourier analysis
Zi-Xiang Zhou
Physics , 2002,
Abstract: A value given by a simple mathematical expression is proposed which is close to the fine structure constant given by 1998 CODATA recommended values of the fundamental physical constants up to relative accuracy 10^{-7}. This expression relates closely with the value of the overshoot of the Gibbs phenomenon in Fourier analysis.
Finite dimensional Hamiltonian system related to Lax pair with symplectic and cyclic symmetries
Zi-Xiang Zhou
Physics , 2011, DOI: 10.1088/0951-7715/25/2/371
Abstract: For the 1+1 dimensional Lax pair with a symplectic symmetry and cyclic symmetries, it is shown that there is a natural finite dimensional Hamiltonian system related to it by presenting a unified Lax matrix. The Liouville integrability of the derived finite dimensional Hamiltonian systems is proved in a unified way. Any solution of these Hamiltonian systems gives a solution of the original PDE. As an application, the two dimensional hyperbolic $C_n^{(1)}$ Toda equation is considered and the finite dimensional integrable Hamiltonian system related to it is obtained from the general results.
The Gentlest Ascent Dynamics
Weinan E,Xiang Zhou
Mathematics , 2010, DOI: 10.1088/0951-7715/24/6/008
Abstract: Dynamical systems that describe the escape from the basins of attraction of stable invariant sets are presented and analyzed. It is shown that the stable fixed points of such dynamical systems are the index-1 saddle points. Generalizations to high index saddle points are discussed. Both gradient and non-gradient systems are considered. Preliminary results on the nature of the dynamical behavior are presented.
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