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Search Results: 1 - 10 of 5015 matches for " Hongfei Zou "
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Feeding habitat of red-crowned crane and white-napped crane during their courtship period in Zhalong Wetland.

ZOU Hongfei,WU Qingming,

应用生态学报 , 2006,
Abstract: By the methods of fixed-spot observation,GPS positioning,plot sampling measurement and factor analysis,a comparative study was made on the feeding habitat of red-crowned and white-napped crane during their courtship period(from March to April) in Zhalong Nature Reserve in 2003 and 2004.The results showed that red-crowned crane preferred unique habitat for feed,mostly focused on water field(e.g.,reed marsh).During its selection of microhabitat,food factor played a crucial role,followed by concealment factor,water factor,and identification factor.The feeding habitat of white-napped crane was of diversification,and dry field,e.g.,Carex marsh,farmland and burned field,was the priority.White-napped crane had a strict requirement in selecting feeding microhabitat,with "valid food" factor as the most important ingredient,and disturbance and water factors as the subordinate one.
Hoarding habitat selection of squirrels (Sciurus vulgaris) in Liangshui Nature Reserve, China

Jianzhang M,Cheng Zong,Qingming Wu,Hongfei Zou,Yan Sun,Xin Zheng,

生态学报 , 2006,
Hmgb1-IL-23-IL-17-IL-6-Stat3 Axis Promotes Tumor Growth in Murine Models of Melanoma
Qiu Tang,Jian Li,Hongfei Zhu,Pan Li,Zhenwei Zou,Yin Xiao
Mediators of Inflammation , 2013, DOI: 10.1155/2013/713859
Abstract: In order to understand how tumor cells can escape immune surveillance mechanisms and thus develop antitumor therapies, it is critically important to investigate the mechanisms by which the immune system interacts with the tumor microenvironment. In our current study, IL-17 deficiency results in reduced melanoma tumor size, diminished numbers of proliferating cells and blood vessels, and decreased percentage of CD11b+Gr-1+ MDSCs in tumor tissues. IL-17 promotes IL-6 induction and Stat3 activation. Treatment of Stat3 inhibitor WP1066 in B16-F10 tumor cells inoculated wild-type mice inhibits tumor growth. Additional administration of recombinant IL-6 into B16-F10 tumor-bearing IL-17?/? mice results in markedly increased tumor size and p-Stat3 expression, whereas additional recombinant IL-17 administration into B16-F10 tumor-bearing wild-type mice treated with anti-IL-6 mAb does not significantly alter the tumor growth and p-Stat3 expression. In our further study, blockade of Hmgb1-RAGE pathway inhibits melanoma tumor growth and reduces production of IL-23 and IL-17. All these data suggest that Hmgb1-IL-23-IL-17-IL-6-Stat3 axis plays a pivotal role in tumor development in murine models of melanoma, and blocking any portion of this axis will attenuate melanoma tumor growth. 1. Introduction In order to understand how tumor cells can escape immune surveillance mechanisms and thus develop antitumor therapies, it is critically important to investigate the mechanisms by which the immune system interacts with the tumor microenvironment. The tumor microenvironment potently inhibits immune responses against tumor cells through various soluble mediators and mechanisms [1–3]. IL-17 is an inflammatory cytokine which plays an important role in the regulation of leukocyte migration in inflammatory reaction [4–8]. The role of IL-17 in inflammatory and autoimmune diseases has been studied extensively [9, 10]. Until now, the role of IL-17 in tumor development is controversial. Recent reports showed that tumor growth was increased in IL-17 deficiency mice and the mechanism was associated with NK cells [11, 12]. Some other reports indicated inhibited tumor growth in IL-17 deficiency mice due to the increased myeloid-derived suppressor cells (MDSCs) infiltration and IL-6 production in tumors [1, 13]. High-mobility group box 1 (Hmgb1) is an evolutionarily conserved, chromatin-binding protein that has been implicated in several disease states including sepsis, arthritis, ischemia-reperfusion injury, and cancer [14–16]. Cancer cells that have undergone necrotic cell death can
Statistical properties of interval maps with critical points and discontinuities
Hongfei Cui
Mathematics , 2009,
Abstract: We consider dynamical systems given by interval maps with a finite number of turning points (including critical points, discontinuities) possibly of different critical orders from two sides. If such a map $f$ is continuous and piecewise $C^2$, satisfying negative Schwarzian derivative and some summability conditions on the growth of derivatives and recurrence along the turning orbits, then $f$ has finitely many attractors whose union of basins of attraction has total probability, and each attractor supports an absolutely continuous invariant probability measure $\mu$. Over each attractor there exists a renormalization $(f^m,\mu)$ that is exact, and the rates of mixing (decay of correlations) are strongly related to the rates of growth of the derivatives and recurrence along the turning orbits in the attractors. We also give a sufficient condition for $(f^m,\mu)$ to satisfy the Central Limit Theorem. In some sense, we give a fairly complete global picture of the dynamics of such maps. Similarly, we can get similar statistical properties for interval maps with critical points and discontinuities under some more assumptions.
Approximating Acceptance Probabilities of CTMC-Paths on Multi-Clock Deterministic Timed Automata
Hongfei Fu
Computer Science , 2012,
Abstract: We consider the problem of approximating the probability mass of the set of timed paths under a continuous-time Markov chain (CTMC) that are accepted by a deterministic timed automaton (DTA). As opposed to several existing works on this topic, we consider DTA with multiple clocks. Our key contribution is an algorithm to approximate these probabilities using finite difference methods. An error bound is provided which indicates the approximation error. The stepping stones towards this result include rigorous proofs for the measurability of the set of accepted paths and the integral-equation system characterizing the acceptance probability, and a differential characterization for the acceptance probability.
Maximal Cost-Bounded Reachability Probability on Continuous-Time Markov Decision Processes
Hongfei Fu
Computer Science , 2013,
Abstract: In this paper, we consider multi-dimensional maximal cost-bounded reachability probability over continuous-time Markov decision processes (CTMDPs). Our major contributions are as follows. Firstly, we derive an integral characterization which states that the maximal cost-bounded reachability probability function is the least fixed point of a system of integral equations. Secondly, we prove that the maximal cost-bounded reachability probability can be attained by a measurable deterministic cost-positional scheduler. Thirdly, we provide a numerical approximation algorithm for maximal cost-bounded reachability probability. We present these results under the setting of both early and late schedulers.
A monoclinic polymorph with Z = 4 of (E)-2,4-dihydroxyacetophenone 2,4-dinitrophenylhydrazone N,N-dimethylformamide monosolvate
Hongfei Han,Yaohua Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811050161
Abstract: The title compound, C14H12N4O6·C3H7NO, is a monoclinic polymorph of an already published structure [Baughman et al. (2004). Acta Cryst. C60, 103–106]. In the previously reported structure, the compound crystallized in the triclinic space group Poverline{1} (Z = 2), whereas the structure reported here is monoclinic (P21/n, Z = 4). In both forms, two intramolecular hydrogen bonds result in the formation of a fairly planar hydrazone skeleton (r.m.s. deviations for all non-H atoms = 0.127 for the monoclinic from and 0.131 for the triclinic form) and each molecule is hydrogen bonded to one solvent molecule. The principal difference between the two forms lies in the different orientation of the two molecules. In the monoclinic form, the two molecules are almost coplanar [dihedral angle = 3.27 (2)°], whereas in the triclinic form the two molecules are almost mutulally perpendicular (dihedral angle = 85.3°).
System Dynamics and Adaptive Control for MEMS Gyroscope Sensor
Juntao Fei,Hongfei Ding
International Journal of Advanced Robotic Systems , 2011,
Abstract: This paper presents an adaptive control approach for Micro-Electro-Mechanical Systems (MEMS) z-axis gyroscope sensor. The dynamical model of MEMS gyroscope sensor is derived and adaptive state tracking control for MEMS gyroscope is developed. The proposed adaptive control approaches can estimate the angular velocity and the damping and stiffness coefficients including the coupling terms due to the fabrication imperfection. The stability of the closed-loop systems is established with the proposed adaptive control strategy. Numerical simulation is investigated to verify the effectiveness of the proposed control scheme.
Breakup Temperature of Target Spectators in Au + Au Collisions at E/A = 1000 MeV
Hongfei Xi,ALADIN collaboration
Physics , 1997, DOI: 10.1007/s002180050420
Abstract: Breakup temperatures were deduced from double ratios of isotope yields for target spectators produced in the reaction Au + Au at 1000 MeV per nucleon. Pairs of $^{3,4}$He and $^{6,7}$Li isotopes and pairs of $^{3,4}$He and H isotopes (p, d and d, t) yield consistent temperatures after feeding corrections, based on the quantum statistical model, are applied. The temperatures rise with decreasing impact parameter from 4 MeV for peripheral to about 10 MeV for the most central collisions. The good agreement with the breakup temperatures measured previously for projectile spectators at an incident energy of 600 MeV per nucleon confirms the observed universality of the spectator decay at relativistic bombarding energies. The measured temperatures also agree with the breakup temperatures predicted by the statistical multifragmentation model. For these calculations a relation between the initial excitation energy and mass was derived which gives good simultaneous agreement for the fragment charge correlations. The energy spectra of light charged particles, measured at $\theta_{lab}$ = 150$^{\circ}$, exhibit Maxwellian shapes with inverse slope parameters much higher than the breakup temperatures. The statistical multifragmentation model, because Coulomb repulsion and sequential decay processes are included, yields light-particle spectra with inverse slope parameters higher than the breakup temperatures but considerably below the measured values. The systematic behavior of the differences suggests that they are caused by light-charged-particle emission prior to the final breakup stage. PACS numbers: 25.70.Mn, 25.70.Pq, 25.75.-q
Phononic Thin Plates with Embedded Acoustic Black Holes
Hongfei Zhu,Fabio Semperlotti
Physics , 2014, DOI: 10.1103/PhysRevB.91.104304
Abstract: We introduce a class of two-dimensional non-resonant single-phase phononic materials and investigate its peculiar dispersion characteristics. The material consists of a thin plate-like structure with an embedded periodic lattice of Acoustic Black Holes. The use of these periodic tapers allows achieving remarkable dispersion properties such as Zero Group Velocity in the fundamental modes, negative group refraction index, bi-refraction, and mode anisotropy. The dispersion properties are numerically investigated using a three-dimensional supercell plane wave expansion method. The effect on the dispersion characteristics of key geometric parameters of the black hole, such as the taper profile and the residual thickness, are also explored.
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