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We use the approximate distribution comes from probability generating function of CreditRisk+ to value the CDO under the single sector factor and multi-sector factors scenarios. For single sector factor model, we discuss the sensitive analysis of CDO fair spread by different default probability, default correlation and loss given default. For multi-sector factors model, we exam the CDO fair spread based on different sector correlation assumption, such as Gamma distribution in moment match method, multivariate Gamma distribution and compound Gamma distribution.

本文在信用风险加成模型之下，利用机率产生函数的近似分配评价抵押债务债券，并考虑单一部门因子与多个部门因子，单一部门因子中，在不同违约机率、违约相关系数和违约损失率下，探讨抵押债务债券公平价差之敏感度分析；多个部门因子中，在不同相关性部门因子分配假设下，如动差配适法的伽玛分配、多维伽玛分配、复合伽玛分配，探讨抵押债务债券公平价差之方法结果比较。

More than 600 employees, of which more than 150 engineering and technical personnel, other professionals more than 40 people.

职工600多人，其中工程技术人员150多人，其他专业人员40多人。

In order to efficiently handle multi-constraints, a vector function inner product is defined in the zero level set and a gradient projection method is constructed, and the necessary condition satisfied by the optimal solution is proved.

在这些研究的基础上，提出了适用于一般目标函数、多材料、多约束和多载荷工况的结构拓扑优化的水平集算法4.1，并给出了刚性结构、柔性机构和复合材料微结构设计算法5.1、6.1和7.1，以及大量的数值算例。

The "cheap nurses are good nurses" thesis is demonstrably false; in the British health service, the economists Emma Hall, Carol Propper and John van Reenen have shown that lower real wages for nursing staff mean more temporary staff, more overpromoted staff – and more patient deaths.

经济学家艾玛·霍尔、卡罗尔·普洛伯和约翰·范·雷南已经证明，在英国的医疗服务体系中，护理人员较低的实际工资意味着更多的临时工，更多晋升过快的员工，以及更多的病患死亡。

However, the cell wall cultured at high concentration of Cu2+(10～200 mg/L) was clearly thickened and became multiple layers, and the pigment decreased and the pyrenoid became one or disappeared. Low concentration of Cu2+(0.01 mg/L, 0.1 mg/L) did not affect the growth of Chlorococcum sp., but the growth became slow and even negative beyond the concentration of 0.1 mg/L.

与对照BG11培养的绿球藻比较，0.01～1 mg/L Cu2+浓度下培养的绿球藻，细胞壁无明显增厚，色素没有多大变化，但蛋白核由一个变为多个；而在高浓度(10～200 mg/L Cu2+)下，细胞壁明显增厚为多层，色素减少，蛋白核减少并回复到1个或消失。

Vitamin B6 is a water-soluble vitamin that exists in three major chemical forms: pyridoxine, pyridoxal, and pyridoxamine. It performs a wide variety of functions in your body and is essential for your good health.

维他命B6是水溶性维他命，以吡多辛、吡多醛及吡多胺三种主要化学形态出现，能在人体发挥多种功能，是不可或缺的健康要素。

Using tea polyphenol and Vc as the control, the effect of lotus seed polyphenol on scavenging OH and O2(superscript -) was studied with Fenton reaction and pyrogallol autoxidation methods.

以茶多酚和Vc为对照，采用Fenton反应法研究莲子多酚对羟自由基的清除作用；采用邻苯三酚自氧化法研究莲子多酚对超氧阴离子自由基O2

In this system, a multi-channel selecting switch is added in front of the A/D to acquire the multi-channel signal from the colorimetric pyrometer .

系统在A／D的前端加上多信道选择开关，实现多色比色测温仪的多路信号采集；由单片机控制数据的采集和缓冲，数据则用上位机进行实时处理。

Jamesonite, marmatite, pyrrhotite and pyrite are the complicated and mutiple-metal sulfide resources to process difficultly in Dachang Mine. Research on the basic theory of flotation electrochemistry and on potential-controlled flotation technology of the sulfide resources can be helpful to develop some new flotation theory and technology of the complicated and mutiple-metal sulfides, and to utilizate comprehensively the mineral resources, and to lower their production cost, and to improve the economical benefits. It is of important theoretical and practical significance.

脆硫锑铅矿、铁闪锌矿、磁黄铁矿、黄铁矿是大厂特有的难分离、难处理的复杂多金属硫化矿物资源，对其进行浮选电化学的基础理论和电位调控浮选技术研究，可发展复杂多金属硫化矿物浮选分离理论，形成复杂多金属硫化矿物浮选分离的创新技术，加强矿产资源的综合利用，降低成本，提高经济效益，具有重要理论意义和现实意义。

And we have over 130 staff. We have a great research team and a sales team. We import the most advanced production equipment , and use original environmental craftsmanship design formula, and developed series of standard and suit's high range quartzite's board independently.

公司拥有一支高素质的科研和销售团队，引进最先进的生产设备，采用独到环保的工艺设计配方，独立研制开发出多规格，多系列，多花色的高档石英石材产品。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。