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By means of a nonlinear alternative theorem of Leray-Schauder type and Guo-Krasnoselskii's fixed point theorem in a cone, we establish the existence theorem of a positive solution to a singular coupled system of nonlinear fractional differential equations.

借助于锥上的非线性Leray-Schauder择一型定理和郭-Krasnoselskii's不动点定理，我们建立了非线性奇异耦合分数次微分方程组正解的存在性定理。

Self graduates to sit for the national graduate entrance examination unity; Self graduates must work for two years before they can apply for graduate students, some schools on the basis of these conditions must be coupled with the adoption of Self trunk undergraduate courses, Some schools are not part of professional recruiting college graduates.

自考本科毕业生可报考全国硕士研究生统一招生考试；自考专科毕业生必须工作两年后才可报考研究生，有的学校在此条件的基础上加上必须通过自考本科主干课程的规定，有的学校规定部分专业不招收大专毕业生。

The synthesis of the pentacyclic skeleton of Et-743 and the construction of the five chiral centers thereof.1. The core pentacyclic skeleton of phthalascidin was constructed with L-dopa as the starting material via thirteen steps. First, two basic synthons, the C-1 functionalized tetrahydroisoquinoline compounds 8 and N-protected Z-dopa derivative 9, were prepared from L-dopa. They were coupled via amide bond to form the dipeptide compounds 10, which were the first key intermediates. Then the primary hydroxyl groups were transformed into the corresponding amino aldehydes 11 via Swern oxidation. Followed by the intramolecular Pictet-Spengler cyclization, the pentacyclic compounds 12 were synthesized.

五环骨架的构建及五个正确手性中心的确立：1.1我们以L-多巴为起始原料，经过多步官能团保护和转化合成了基本结构单元8然后和苯丙氨酸衍生物9，通过缩合反应生成酰胺中间体10，经Swern氧化得到醛化合物11，然后再次利用分子内改良的Pictet-Spengler反应一步构建c，d两环，得到五环骨架化合物12，最后，实现了21-位羰基向氰基的转化，得到了C-1位官能化的化合物14，化合物14不但具有和Et-743一致的五环骨架，而且分子中五个手性中心立体构型也与其完全相同：其中，3，位和13，位的手性中心由原料L-多巴带入，而1，位，11，位和21，位手性中心则通过不对称诱导而确立。

In real engineering, the two surfaces in sliding contact are rough. And it is an important theoretical part to calculate the coupled temperature and stress of sliding bodies having rough surfaces.

工程实际中，相互接触的滑动摩擦表面是粗糙的，对粗糙表面的瞬时温升和热－机械应力分析有重要的理论意义。

Thirdly, the author puts emphasis on the analysis of interpersonal communication system for agricultural science and technology, and makes a brief analysis in the organization communication system of agricultural science, and technology Initially classifying the structure of interpersonal communication in rural areas using "sociometry", coupled with individual interview, she finds that agricultural science and technology information spreads by way of "Opinion Leader", supposing the fundamental social communities as environment, interpersonal communication as means.

再次，着重分析了农业科技的人际传播机制，并对农业科技的组织传播机制进行了简要分析。

The content of potassium oxide, sodium oxide and zinc oxide in blast furnace burden was simultaneously determined by inductively coupled plasma atomic emission spectrometry.

采用电感耦合等离子体原子发射光谱法同时测定高炉炉料中氧化钾、氧化钠和氧化锌的含量。

In this paper, the possible effects of solar radiation change caused by solar constant change on airborne dust concentration over East Asia are researched using the NCAR Community Climate Model version 3(CCM3) coupled with a mineral Dust Entrainment and Deposition model.

利用美国大气研究中心的公用气候模式(CCM3)与一个粉尘释放和沉降模式相嵌套的模式CCM3-DEAD，研究了太阳常数改变所引起的太阳辐射变化对东亚大气粉尘含量的可能影响。

Based on the conclusions of passive control and stable conditions of the coupled system, the passive stability configurations of solar sail on displaced solar orbit and at artificial Lagrange point are designed.

被动控制要求太阳帆的法线方向与太阳光之间的夹角保持不变，此时太阳帆的轨道总是稳定的且其轨道参数由太阳帆的初始角动量唯一确定。

In this article,authors give a brief introduction of coupled application of concrete expansion agent and EPDM in soleplate of Huawei Research Center Project.

介绍了低碱低掺量高效混凝土膨胀剂UEA-H和三元乙丙橡胶卷材在深圳华为科研中心地库底板防水工程中的联合应用。

By using one-dimensional finite different hydrodynamic code coupled with four spall models, spall in ductile metal has been studied.

在平面一维弹塑性流动有限差分计算程序中加入4种延性金属层裂模型，对平板撞击层裂实验进行数值模拟。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。