高强混凝土徐变力学实验研究

为掌握苏通大桥连续刚构桥所用C60高强混凝土的徐变性能,开展了自然环境下配筋高强混凝土的徐变力学试验.为获得徐变试验所需75t的加载力,设计并制造出95t的徐变加载装置,解决了混凝土徐变试验大吨位加载的问题.针对应变测试过程中温度变化对应变测试的影响作了深入的探讨,提出了应变计温度影响的修正方法.通过试验结果与现行桥规JTG D62-2004的比较得出:配筋高强混凝土徐变系数远小于规范取值,且在170天后徐变系数有收敛的特征.试验结果说明,实桥所用C60高强混凝土的徐变可以满足桥梁对混凝土耐久性的要求.     

Remarks on Complete Spacelike Hyper-surfaces with Constant Mean Curvature in the de Sitter Space

Let M be an n(≥3)-dimensional completely non-compact spacelike hypersurface in the de Sitter space S1 (n+1) (1) with constant mean curvature and non negative sectional curvature. It is proved that M is isometric to a hyperbolic cylinder or an Euclidean space if H ≥1. When 2(n-1)~(1.2)/n < H < 1, there exists a complete rotation hypersurfaces which is not a hyperbolic cylinder.     

曲率二次衰减的完备流形的基本群

本文研究曲率二次衰减的完备黎曼流形,证明了若它的直径增长满足小的线性增长条件,则其基本群是有限生成的.     

Clifford 环面 Sm(\sqrt{\frac{m}{n}})×Sn-m(\sqrt{\frac{n-m}{n}})的刚性定理

\small\zihao{-5}\begin{quote}{\heiti 摘要:} 设$M$为$n+1$维单位球面$S^{n+1}(1)$中的一个极小闭超曲面，如果 $ n \le S \le n+\frac{2}{3}$, 则有 $S=n$ 且 $M$ 与某一Clifford 环面 $S^m(\sqrt{m/n}) \times S^{n-m}(\sqrt{(n-m)/n})$等距.     

液-质联用技术分析甘露寡糖

 利用液 质联用技术 (LC ESI MS)对啤酒酵母甘露聚糖乙酰解产物进行分析。电喷雾离子源为Na+ ;利用氨基柱对甘露聚糖乙酰解产物进行分离 ;流动相为乙腈 水 (70∶30 ,体积比 )。结果表明 ,该甘露聚糖的侧链是由甘露糖、甘露二糖、甘露三糖和甘露四糖组成。将该方法用于低聚糖相对分子质量的测定 ,结果准确、可靠、快速。     

Zygmund微分映射的正则点

该文的主要结果是: 对任意Zygmund类$C^{p,Z}$映射$f:R^{n}\rightarrow R^{m}$, 若$\frac{n-m}{2}\leq p\leq n-m-1$, 则有mes$K_{f}>0$或者mes$C_{f}>0$. 这个结果给出了Hirsch问题的部分回答.     

HYPERSURFACES IN SPACE FORMS WITH SCALAR CURVATURE CONDITIONS

Let f : M^n→S^n 1真包含于R^n 2 be an n-dimensional complete oriented Riemannian manifold minimally immersed in an (n 1)-dimensional unit sphere S^n 1. Denote by S^n 1 the upper closed hemisphere. If f(M^n)包含于S ^n 1, then under some curvature conditions the authors can get that the isometric immersion is a totally embedding. They also generalize a theorem of Li Hai Zhong on hypersurface of space form with costant scalar curvature.     

RIGIDITY THEOREMS OF CLIFFORD TORUS

In this article, we prove that the Clifford torus S1(1-r2~(1/2)) × Sn-1(r) is the only closed hypersurface in the unit sphere Sn+1(1) with infinite fundamental group, which satisfy r2 ≥ (n-1)/n, RicM ≤ C-(H), and S ≤ S+(H). Moreover, we give a characterization of Clifford torus S1(1-r2~(1/2)) × Sn-1(r) with r2 = 2(n-1)+nH2±|H| n2H2+4(n-1)(1/2)/2n(1+H2) .     

紧致超曲面上的谱

设Ｍ是Ｓ^n 1(1)上的紧致极小超曲面,Ｍ１,n-1是Ｓ^(n 1)(1)上的Ｃlifford极小超曲面。若它们的谱相同,则它们是墙虎的。对于Ｓ^(n 1)(1)上的紧致常平均曲率超曲面和Ｈ（r)－环,在某些条件下等谱可推出等距。