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Search Results: 1 - 10 of 43116 matches for " Howard Z. ZENG "
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Martial Arts Anthropology for Sport Pedagogy and Physical Education
Wojciech J. CYNARSKI,Kazimierz OBODYNSKI,Howard Z. ZENG
Revista Romaneasca pentru Educatie Multidimensionala , 2012,
Abstract: The aim of this paper is to discuss the subject as well as the problem of corporeality and spirituality in the anthropology of martial arts. The authors attempt to show the vision of a new psychophysical education on the way of martial arts and the taking of personal patterns here. Analysies are made in the perspective of the holistic pedagogy and humanistic theory of martial arts.Qualitative methods, such as studying literature, direct interview and long-term participant observation were used. The authors wish to begin with the concept of corporeality as it is found in the available literature on the subject.The first author has been active in an environment of martial arts for over 30 years. Interviews and discussions were conducted with 9 martial arts masters of the highest rank.Results and conclusions. Psychophysical system of self-realization is an educational programme – a way which relates to spiritual development through physical and mental exercise, according to teaching by a particular master-teacher. Within the context of martial arts being used as a psycho-educational form of education, the body fulfills, above all, the role of a tool to be used on the way towards enlightenment and wisdom. It is utilized specifically in spiritual progress. Improving one’s physical abilities is therefore an ascetic journey of physical perfectionism and technical accomplishment all towards achieving spiritual mastery. In some cases, spiritual development is described in terms of energy (qi, ki) and connected with the capacity of one’s health.Traditional understanding of martial arts is often mixed with combat sports or systems of meditation are numbered among movement forms. The opportunity to avoid similar mistakes is to adopt a theoretical perspective of the anthropology of psychophysical progress. Paradigm of systematic approach and integral outlook on the human allow for understanding of the sense of being involved in ascetic and psychophysical practices.Utilitarian values of some martial arts causes, that the martial arts are very useful for PE curriculum. Falls and other exercises, elements of self defence techniques are beneficial for both for more safe teaching and future safe life.
Spontaneous focal activation of invariant natural killer T (iNKT) cells in mouse liver and kidney
Jia Zeng, Jonathan C Howard
BMC Biology , 2010, DOI: 10.1186/1741-7007-8-142
Abstract: We used an interferon (IFN)-γ-inducible cytoplasmic protein, Irga6, as a histological marker for local IFN-γ production. Irga6 was intensely expressed in small foci of liver parenchymal cells and kidney tubular epithelium. Focal Irga6 expression was unaffected by germ-free status or loss of TLR signalling and was totally dependent on IFN-γ secreted by T cells in the centres of expression foci. These were shown to be iNKT cells by diagnostic T cell receptor usage and their activity was lost in both CD1 d and Jα-deficient mice.This is the first report that supplies direct evidence for explicit activation events of NKT cells in vivo and raises issues about the triggering mechanism and consequences for immune functions in liver and kidney.Invariant natural killer-like T (iNKT) cells are placed ambiguously between adaptive and innate immune systems (reviewed in [1,2]). Derived from the thymus, expressing rearranged T-cell receptor (TCR) alpha and beta chains, they seem to belong to the adaptive immune system, while their receptor homogeneity, their continuous state of activation, their rapid secretion of large amounts of interferon (IFN)-γ and interleukin (IL)-4, their presumed recognition of invariant glycolipid self-ligands associated with the non-classical major histocompatibility (MHC) class I molecule, CD1 d, recall various aspects of innate immune recognition. Many features of iNKT cell behaviour are puzzling: their thymic ontogeny and relation to the classical pathways of T-cell mediated differentiation; the relative importance of endogenous and exogenous ligands in activation; and the polarity of their cytokine profile towards IFN-γ or IL-4 in relation to the activating ligand. However, in this report we address the basis for another characteristic of these enigmatic cells, namely their constitutive state of readiness to respond with massive cytokine production (reviewed in [3]). Using a sensitive endogenous reporter for IFN-γ production, we show that iNKT cells
Dynamic Monitoring of Plant Cover and Soil Erosion Using Remote Sensing, Mathematical Modeling, Computer Simulation and GIS Techniques  [PDF]
Z. Y. Zeng, J. Z. Cao, Z. J. Gu, Z. L. Zhang, W. Zheng, Y. Q. Cao, H. Y. Peng
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.47180
Abstract:

Dynamic monitoring of plant cover and soil erosion often uses remote sensing data, especially for estimating the plant cover rate (vegetation coverage) by vegetation index. However, the latter is influenced by atmospheric effects and methods for correcting them are still imperfect and disputed. This research supposed and practiced an indirect, fast, and operational method to conduct atmospheric correction of images for getting comparable vegetation index values in different times. It tries to find a variable free from atmospheric effects, e.g., the mean vegetation coverage value of the whole study area, as a basis to reduce atmospheric correction parameters by establishing mathematical models and conducting simulation calculations. Using these parameters, the images can be atmospherically corrected. And then, the vegetation index and corresponding vegetation coverage values for all pixels, the vegetation coverage maps and coverage grade maps for different years were calculated, i.e., the plant cover monitoring was realized. Using the vegetation coverage grade maps and the ground slope grade map from a DEM to generate soil erosion grade maps for different years, the soil erosion monitoring was also realized. The results show that in the study area the vegetation coverage was the lowest in 1976, much better in 1989, but a bit worse again in 2001. Towards the soil erosion, it had been mitigated continuously from 1976 to 1989 and then to 2001. It is interesting that a little decrease of vegetation coverage from 1989 to 2001 did not lead to increase of soil erosion. The reason is that the decrease of vegetation coverage was chiefly caused by urbanization and thus mainly occurred in very gentle terrains, where soil erosion was naturally slight. The results clearly indicate the details of plant cover and soil erosion change in 25 years and also offer a scientific foundation for plant and soil conservation.

Microwave Anisotropies from Texture Seeded Structure Formation
R. Durrer,A. Howard,Z. -H. Zhou
Physics , 1993, DOI: 10.1103/PhysRevD.49.681
Abstract: The cosmic microwave anisotropies in a scenario of large scale structure formation with cold dark matter and texture are discussed and compared with recent observational results of the COBE satellite. A couple of important statistical parameters are determined. The fluctuations are slightly non gaussian. The quadrupole anisotropy is $1.5\pm 1.2\times 10^{-5}$ and the fluctuations on a angular scale of 10 degrees are $ (3.8\pm 2.6)\times 10^{-5}$. The COBE are within about one standard deviation of the typical texture + CDM model discussed in this paper. Furthermore, we calculate fluctuations on intermediate scales (about 2 degrees) with the result $\De T/T(\theta \sim 2^o) = 3.9\pm 0.8)\times 10^{-5}$. Collapsing textures are modeled by spherically symmetric field configurations. This leads to uncertainties of about a factor of~2.
Asymptotics of Reaction-Diffusion Fronts with One Static and One Diffusing Reactant
Martin Z. Bazant,Howard A. Stone
Physics , 1999, DOI: 10.1016/S0167-2789(00)00140-8
Abstract: The long-time behavior of a reaction-diffusion front between one static (e.g. porous solid) reactant A and one initially separated diffusing reactant B is analyzed for the mean-field reaction-rate density R(\rho_A,\rho_B) = k\rho_A^m\rho_B^n. A uniformly valid asymptotic approximation is constructed from matched self-similar solutions in a reaction front (of width w \sim t^\alpha where R \sim t^\beta enters the dominant balance) and a diffusion layer (of width W \sim t^{1/2} where R is negligible). The limiting solution exists if and only if m, n \geq 1, in which case the scaling exponents are uniquely given by \alpha = (m-1)/2(m+1) and \beta = m/(m+1). In the diffusion layer, the common ad hoc approximation of neglecting reactions is given mathematical justification, and the exact transient decay of the reaction rate is derived. The physical effects of higher-order kinetics (m, n > 1), such as the broadening of the reaction front and the slowing of transients, are also discussed.
Ground-state OH molecule in combined electric and magnetic fields: Analytic solution of the effective Hamiltonian
M. Bhattacharya,Z. Howard,M. Kleinert
Physics , 2013, DOI: 10.1103/PhysRevA.88.012503
Abstract: The OH molecule is currently of great interest from the perspective of ultracold chemistry, quantum fluids, precision measurement and quantum computation. Crucial to these applications are the slowing, guiding, confinement and state control of OH, using electric and magnetic fields. In this article, we show that the corresponding eight-dimensional effective ground state Stark-Zeeman Hamiltonian is exactly solvable and explicitly identify the underlying chiral symmetry. Our analytical solution opens the way to insightful characterization of the magnetoelectrostatic manipulation of ground state OH. Based on our results, we also discuss a possible application to the quantum simulation of an imbalanced Ising magnet.
A Dedicated Promoter Drives Constitutive Expression of the Cell-Autonomous Immune Resistance GTPase, Irga6 (IIGP1) in Mouse Liver
Jia Zeng, Iana Angelova Parvanova, Jonathan C. Howard
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006787
Abstract: Background In general, immune effector molecules are induced by infection. Methodology and Principal Findings However, strong constitutive expression of the cell-autonomous resistance GTPase, Irga6 (IIGP1), was found in mouse liver, contrasting with previous evidence that expression of this protein is exclusively dependent on induction by IFNγ. Constitutive and IFNγ-inducible expression of Irga6 in the liver were shown to be dependent on transcription initiated from two independent untranslated 5′ exons, which splice alternatively into the long exon encoding the full-length protein sequence. Irga6 is expressed constitutively in freshly isolated hepatocytes and is competent in these cells to accumulate on the parasitophorous vacuole membrane of infecting Toxoplasma gondii tachyzoites. Conclusions and Significance The role of constitutive hepatocyte expression of Irga6 in resistance to parasites invading from the gut via the hepatic portal system is discussed.
Phase Separation Dynamics in Isotropic Ion-Intercalation Particles
Yi Zeng,Martin Z. Bazant
Physics , 2013,
Abstract: Lithium-ion batteries exhibit complex nonlinear dynamics, resulting from diffusion and phase transformations coupled to ion intercalation reactions. Using the recently developed Cahn-Hilliard reaction (CHR) theory, we investigate a simple mathematical model of ion intercalation in a spherical solid nanoparticle, which predicts transitions from solid-solution radial diffusion to two-phase shrinking-core dynamics. This general approach extends previous Li-ion battery models, which either neglect phase separation or postulate a spherical shrinking-core phase boundary, by predicting phase separation only under appropriate circumstances. The effect of the applied current is captured by generalized Butler-Volmer kinetics, formulated in terms of diffusional chemical potentials, and the model consistently links the evolving concentration profile to the battery voltage. We examine sources of charge/discharge asymmetry, such as asymmetric charge transfer and surface "wetting" by ions within the solid, which can lead to three distinct phase regions. In order to solve the fourth-order nonlinear CHR initial-boundary-value problem, a control-volume discretization is developed in spherical coordinates. The basic physics are illustrated by simulating many representative cases, including a simple model of the popular cathode material, lithium iron phosphate (neglecting crystal anisotropy and coherency strain). Analytical approximations are also derived for the voltage plateau as a function of the applied current.
Research on the Software of Track Reconstruction in Vertex Chamber of BESII
Y. Zeng,Z. P. Mao
Physics , 2003,
Abstract: The software of track reconstruction of the vertex chamber of BESII-VCJULI was studied when it was transplanted from the HP-Unix platform to PC-Linux. The problems of distinct dictionary storage and precision treatment in these two different platforms were found and settled in the modified software. Then the obvious differences of the candidate track number in an event and some track parameters caused by them were reduced from 74% to 0.02% and from 5% to 0.5%, respectively. As a result, the quality of the track finding was greatly improved and the CPU time saved.
Delocalization and conductance quantization in one-dimensional systems
Z. Y. Zeng,F. Claro
Physics , 2001, DOI: 10.1103/PhysRevB.65.193405
Abstract: We investigate the delocalization and conductance quantization in finite one-dimensional chains with only off-diagonal disorder coupled to leads. It is shown that the appearence of delocalized states at the middle of the band under correlated disorder is strongly dependent upon the even-odd parity of the number of sites in the system. In samples with inversion symmetry the conductance equals $2e^{2}/h$ for odd samples, and is smaller for even parity. This result suggests that this even-odd behaviour found previously in the presence of electron correlations may be unrelated to charging effects in the sample.
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