稀土化合物对安哥拉兔生长及毛产量的影响

本文观察了稀土化合物(稀土STV-2和稀土“常乐”)作为饲料添加剂对安哥拉兔生长及毛产量的影响。结果表明,稀土化合物具有促进兔生长以及毛产量的作用。     

"推-拉"型偶氮苯化合物的质谱分析

“推－ 拉”型偶氮苯化合物分子的共振结构决定了其关键碎裂方式, 有内氢键作用时偶氮则附着于给电子端, 而后续的碎裂过程则遵循各自主要官能团的裂解规律。     

单棱镜色散补偿自锁模钛宝石激光器

分析并描述了单棱镜色散补偿的原理,实验上实验了单棱镜色散补偿的钛宝石自锁模激光器的稳定运转。     

High-Lying Vibrational Spectrum of Ammonia via Nonlinear Quantum Theory

We introduce a simple three-parameter model in nonlinear quantum theory-the discrete self-trapping equation to describe the stretching spectrum of ammonia at highlying vibrational states. The model calculations appear to describe the data well. These results obtained are conducive to researching the quantum chaotic manner and the multiphoton processes and isotope separation by multiphoton dissociation of ammonia molecular system.     

扩散沟道光波导的条形传递函数解

利用条形传递函数方法分析了二维扩散沟道光波导的传播特性,对两种典型折射率分布计算的数值结果与精确解及其它方法的结果进行了比较,表明该方法具有优于其它数值方法的精度.     

氨基酸与蛋白质体系热容研究

氨基酸与蛋白质都是生命现象和分子生物学研究的最基本和最重要的研究对象.利用热力学方法,特别是从热容的角度出发对其研究,对深入了解蛋白质的折叠与伸展、变性机理、稳定性及生命体的新陈代谢等问题均具有一定的意义.近年来,研究者们对蛋白质或氨基酸体系的热容研究做了大量工作,取得了很大进展,本文对此进行了概述。     

Energy identity and necklessness for a sequence of Sacks–Uhlenbeck maps to a sphere

Let u be a map from a Riemann surface M to a Riemannian manifold N and $\alpha >1$, the α energy functional is defined as

$E_{\alpha }(u)=\frac{1}{2}\underset{M}{\int }[{(1+|▽u{|}^2)}^{\alpha }?1]dV.$

We call $u_{\alpha }$ a sequence of Sacks–Uhlenbeck maps if $u_{\alpha }$ are critical points of $E_{\alpha }$ and

$\underset{\alpha >1}{\sup }?E_{\alpha }(u_{\alpha })<\infty .$

In this paper, we show the energy identity and necklessness for a sequence of Sacks–Uhlenbeck maps during blowing up, if the target N is a sphere $S^{K?1}$. The energy identity can be used to give an alternative proof of Perelman's result [15] that the Ricci flow from a compact orientable prime non-aspherical 3-dimensional manifold becomes extinct in finite time (cf. [3], [4]).     

微波辅助萃取-气相色谱法测定茶叶中的有机磷农药

建立了微波辅助萃取–气相色谱法测定茶叶中甲胺磷、乐果、毒死蜱、水胺硫磷、三唑磷5种有机磷农药残留量的分析方法。样品用乙酸乙酯微波辅助提取,提取液经分散固相萃取法(DSPE)净化,用气相色谱配FPD检测器测定,外标法定量。结果表明农药混合标准溶液在0.01～0.5μg/mL范围内线性良好(r>0.999),方法的检出限为0.005～0.01 mg/L,在0.05,0.125,0.5μg/mL 3个水平添加平均回收率为63.3%～99.9%,测定结果的相对标准偏差为5.1%～8.2%(n=6)。该方法适合于茶叶中多种有机磷农药残留量的同时检测。     

Sufficient Dimension Folding for Regression Mean Function

In this article, we consider sufficient dimension folding for the regression mean function when predictors are matrix- or array-valued. We propose a new concept named central mean dimension folding subspace and its two local estimation methods: folded outer product of gradients estimation (folded-OPG) and folded minimum average variance estimation (folded-MAVE). We establish the asymptotic properties for folded-MAVE. A modified BIC criterion is used to determine the dimensions of the central mean dimension folding subspace. We evaluate the performances of the two local estimation methods by simulated examples and demonstrate the efficacy of folded-MAVE in finite samples. And in particular, we apply our methods to analyze a longitudinal study of primary biliary cirrhosis. Supplementary materials for this article are available online.