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World AIDS Day: Mobilizing Social Forces to Fight AIDS Together

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Biomedical and Environmental Sciences 2023年第12期36卷 1194-1195页

作者： CUI yun Shang Chinese Center for Disease Control and Prevention Beijing 102206China

AIDS,short for Acquired Immune Deficiency Syndrome,is a severe immune system-damaging disease caused by human immunodeficiency virus(HIV) *** is widely spread worldwide and has become a serious public health *** raise awareness of AIDS,the World Health Organization designated December 1st as World AIDS Day in *** symbol of World AIDS Day is the red ribbon,which represents the public's concern and support for HIV-infected individuals and AIDS *** theme of World AIDS Day 2023 in China is"Mobilizing Social Forces to Fight AIDS Together".The Chinese Center for Disease Control and Prevention (China CDC) held a theme promotional event for World AIDS Day 2023 in *** event further enhanced public awareness of AIDS prevention and control and mobilized social forces to participate in AIDS prevention and control efforts.

关键词： prevention Together AIDS World

Gradient Estimates for the Equation Δu+cu^(-α)=0 on Riemannian Manifolds

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Acta Mathematica Sinica,English Series 2010年第6期26卷 1177-1182页

作者： yun Yan YANG Department of Mathematics Information School Renmin University of China Beijing 100872 P. R. China

Let （M, g） be a complete non-compact Riemannian manifold without boundary. In this paper, we give the gradient estimates on positive solutions to the following elliptic equation with singular nonlinearity：△u（x）＋cu^-a=0 in M,where a 〉 0, c are two real constants. When c 〈 0 and M is a bounded smooth domain in R^n, the above equation is known as the thin film equation, which describes a steady state of the thin film （see Guo-Wei [Manuscripta Math., 120, 193-209 （2006）]）. The results in this paper can be viewed as an supplement of that of J. Li [J. Funct. Anal., 100, 233-256 （1991）], where the nonlinearity is the positive power of u.

关键词： positive solution gradient estimate thin film equation

Higher Toda Mechanics and Spectral Curves

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Communications in Theoretical Physics 2004年第1X期42卷 9-18页

作者： ZHAOLiu LIUWang-yun InstituteofModernPhysics NorthwestUniversityXi'an710069China InstituteofModernPhysics NorthwestUniversityXi'an710069China

For each of the Lie algebras gln and gl～n., we construct a family of integrable generalizations of the Toda chains characterized by two integers m+ and m-. The Lax matrices and the equations of motion are given explicitly, and the integrals of motion can be calculated in terms of the trace of powers of the Lax matrix L. For the case of m+ = m-,we find a symmetric reduction for each generalized Toda chain we found, and the solution to the initial value problems of the reduced systems is outlined. We also studied the spectral curves of the periodic (m+,m-)-Toda chains, which turns out to be very different for different pairs of m+ and m-. Finally we also obtain thenonabelian generalizations of the (m+, m-)-Toda chains in an explicit form.

关键词：李代数 Toda链光谱曲线松驰矩阵对称衰减

Studies on Wool-Eating Ailment in Guizhou Semi-Fine Wool Sheep

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Agricultural Sciences in China 2011年第10期10卷 1618-1623页

作者： SHEN Xiao-yun College of Chemistry ＆ Chemical Engineering Chongqing University of Science and Technology Chongqing 401331 P.R. China Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 P.R China Pratacultural Ecology Institute Bijie University Bijie 551700 P.R.China

The clinical symptoms of a disorder which is known locally as ＂wool-eating ailment＂ in Guizhou semi-fine wool sheep in the Weining County of Guizhou Province, China, are poor weight gain, lost appetite, pica, emaciation, and wool-eating. The mineral composition of forage, and samples of blood, liver and wool from Guizhou semi-fine wool sheep in affected ranches were compared with those from the unaffected areas. The mean concentration of iron in forage from affected pasture was significantly higher than that from the unaffected pasture. The mean concentration of sulfur in forage from the affected and unaffected pasture was similar and within normal ranges. The mean concentration of sulfur in blood, liver and wool from the affected Guizhou semi-fine wool sheep was significantly lower than that from the unaffected sheep while the content of iron in blood, liver and wool from the affected sheep was significantly higher than that from the unaffected sheep. Oral administration of calcium sulfate prevented and cured the disease. We concluded that the disease of Guizhou semi-fine wool sheep in the Weining County is due to S deficiency caused by the high Fe in forages.

关键词： Guizhou semi-fine wool sheep sulfur iron calcium sulfate wool-eating

Weak Convergence Theorems for Strict Pseudo-contractions in Banach Spaces

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Acta Mathematica Sinica,English Series 2014年第5期30卷 755-766页

作者： Hai yun ZHOU Department of Mathematics Shijiazhuang Mechanical Engineering College

In this paper, it is shown that there is a gap in the paper [Chidume, C. E., Shahzad, N.： Weak convergence theorems for a finite family of strict pseudo-contractions. Nonlinear Anal., 72, 1257–1265（2010）], consequently, the main results of the paper do not hold in uniformly smooth Banach spaces. Meanwhile, it is also shown that the main results（Lemma 3.4, Theorems 3.5–3.6, 3.8–3.9） in the paper [Cholamjiak, P., Suantai, S.： Weak convergence theorems for a countable family of strict pseudo-contractions in Banach spaces. Fixed Point Theory Appl., 2010, Article ID 632137, 16 pages（2010）] do not hold in Lpfor p 〉 3. Finally, some modified results are presented in the setting of uniformly smooth and uniformly convex Banach spaces which include Lpfor p ≥ 2 as special cases. Furthermore, our arguments are also different from the ones given by the authors above.

关键词： Fr′echet differentiable Banach spaces Reich's inequality a countable family of λ-strict pseudo-contractions normal Mann iteration algorithm weak convergence theorems

Tame Kernels of Pure Cubic Fields

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Acta Mathematica Sinica,English Series 2012年第4期28卷 771-780页

作者： Xiao yun CHENG School of Science Nanjing University of Aeronautics and Astronautics

In this paper, we study the p-rank of the tame kernels of pure cubic fields. In particular, we prove that for a fixed positive integer m, there exist infinitely many pure cubic fields whose 3-rank of the tame kernel e... 详细信息

关键词： Tame kernel pure cubic fields class group 3-rank

Effect of Nitrogenous Fertilizer Treatment on Mineral Metabolism in Grazing Yaks

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Agricultural Sciences in China 2009年第3期8卷 361-368页

作者： SHEN Xiao-yun Department of Biology Chongqing University of Science and Technology Chongqing 401331 P.R.China Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 100101 P.R. China

To assess the impact of N fertilization on contents of mineral elements in herbage and the effect of increased forage S on the copper metabolism of grazing yaks, study was conducted during the summer grazing season （2005, 2006, and 2007）. Pasture replicates （20 ha; n=3 per treatment） received the same fertilizer treatment in each growing season, consisting of i） 90 kg N ha^-1 from quickly available nitrogen, ii） 90 kg N ha^-1 from ammonium nitrate, iii） 90 kg N ha^-1 from ammonium sulfate, and iv） control （no fertilizer）. Forage sampling was collected at 60 days intervals following fertilization （10 samples per pasture） for Cu, Mo, Mn, Se, Fe, Zn, Ca, and P. To determine the effect of fertilizer treatment on mineral metabolism in grazing yaks, liver and blood samples were collected at the start and end of the study period in 2005, 2006, and 2007. Ammonium sulfate fertilization increased （P 〈 0.01） forage S concentration. Plant tissue N concentrations were increased by N fertilization, regardless of source in 2005, 2006, and 2007. Yaks grazing S fertilization pastures had lower （P〈0.05） liver and blood Cu concentrations at the end of the study period in 2005, 2006, and 2007, compared with urea, ammonium nitrate, and control. Nominal increases in forage in vitro organic matter digestibility were realized by fertilization, regardless of N source in each year.

关键词： yaks nitrogen fertilizer treatment alpine meadow forage mineral element metabolism

A Class of Bidimensional FMRA Wavelet Frames

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Acta Mathematica Sinica,English Series 2006年第4期22卷 1051-1062页

作者： yun Zhang LI Department of Applied Mathematics Beijing University of Technology Beijing 100022 P. R. China

This paper addresses the construction of wavelet frame from a frame multiresolution analysis （FMRA） associated with a dilation matrix of determinant ±2. The dilation matrices of determinant ±2 can be classified as six classes according to integral similarity. In this paper, for four classes of them, the construction of wavelet frame from an FMRA is obtained, and, as examples, Shannon type wavelet frames are constructed, which have an independent value for their optimality in some sense.

关键词： FMRA FMRA wavelet frame integral similarity

The new RS CVn binary V1034 Her revisited and the orbital period—activity relation of short-period RS CVn binaries using photometric distortion amplitude

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Research in Astronomy and Astrophysics 2012年第4期12卷 433-442页

作者： Li-yun Zhang College of Science/Department of Physics&NAOC-GZU-Sponsored Center for Astronomy Research Guizhou UniversityGuiyang 550025China

This paper presents new CCD BV RI light curves of the newly discovered RS CVn eclipsing binary V1034 Her in 2009 and 2010, the shapes of which are different from previously published results. They show an asymmetric outside eclipse, and we try to use a spot model to explain the phenomenon. Using the Wilson-Devinney program with a one-spot or two-spot model, photometric solutions of the system and starspot parameters were derived. Comparing the two results shows that the case of two spots is more successful in reproducing light-curve distortions. Looking at all the spot longitudes, the trend is towards active longitude belts and each active longitude belt may switch. Comparing the light curves from 2009 and 2010, we can see that the light curve changes over the long time scale of a year, especially in phase 0.25. In addition, we also collected the values of the maximum amplitudes of photometric distortion of the short-period RS CVn binary. We found for the first time that there is a trend of increasing activity with decreasing orbital period. Finally, fitting all available light minimum times including our newly obtained ones with a polynomial function confirmed that the orbital period of V1034 Her increased.

关键词： stars: binaries: late-type — stars: binaries: eclipsing — stars: individuals (V1034 Her) — stars: spots