分层

A new group key management scheme based on grouping and management layer by layer is proposed.

本论文基于这两个方面，主要研究成果如下：对目前存在的多播组密钥管理方案进行了详细的研究分析，尤其是逻辑密钥分层和单向函数树方案，并给出OFT方案不能前向保密和后向保密的依据。

In this paper, the focus is to design a lightweight group key management scheme to safeguard the data packets passing on the sensor networks under different types of attacks.

本文的主要任务是研究和实现一种有效的基于分簇分层结构网络模型的密钥管理机制。

With the guidance of the Theories of Social Capital, this paper uses the methods of single variable, double variable to describe and analyze the existing situation and the differences of the urban habitant's house consumption intents, then it is discussed why there are differences about the urban habitant's house consumption intents, in the end we make conclusions about some important topics.

本文以社会资本理论作为指导理论，运用单变量、双变量统计分析方法，描述、分析了城市居民住房消费取向的现状和差异，探讨了城市居民住房消费取向差异的社会资本原因，提出了社会资本的预期与测量问题，指出了我国住房制度目前存在的问题，提出了社会分层研究的取向研究方法。

I propose that sex-based harassment is fundamentally motivated by the harasser's desire to protect or enhance his or her own sex-based status, a desire that stems from the fact that social status is stratified by a system of gender hierarchy.

我认为基于性别的骚扰，根本动机是骚扰者保护或提高他或她自己的性别为基础的地位的愿望，一个基于这样事实的愿望，即社会地位是根据一个系统的性别等级制度来分层的。

Teaching with layers headstream is in China.

分层教学的源头在中国。

It has to be textured heaver for removing the bulk and adding the volume .

为此，鲍勃需要被钝重的在底部，但分层全国各地。

Hindu a hereditary social class stratified according to ritual purity.

根据宗教仪式的纯度分层的世袭阶级。

With the development of multicast-based multimedia applications and wireless network in recent years , the dynamic and heterogenetic of the network takes more and more important roles in those applications . Layered multicast is recognized as the best technique for solving dynamics and heterogeneousness of the network in multicast environment .

随着无线网络和多媒体组播应用在近几年的快速发展，网络的异构性，动态性等问题也更为突出，分层组播技术的提出为这些问题的解决提供了新的契机，它是目前公认的在组播环境中解决网络异构性以及网络动态性的较好的解决方案。

Combined with the new process and new products, we have developed their characteristic equations and models, especially for hollow; heteromorphism and composite fibers.

结合新工艺和新产品的开发，本文推导了高速纺丝、热管纺丝、热辊纺丝等工艺的特征单元方程及中空、异形、复合纺丝等新品种的特征单元方程，着重推导了圆形纤维、中空纤维、三叶异形纤维、皮芯复合纺丝的分层结构模型及分块模型，并对高速纺丝及中空纤维的不对称冷却结构进行了系统的数学模拟。

In this dissertation, we optimized the thinkness of each layer of TFEL devices using the layered optimization method to obtain ZnS: Ce〓 TFEL devices. Accoding to the energy level structure of Ce〓, two criteria for distinguishing the EL of Ce〓 were found out, from which it was conduded that the TFEL of ZnS: Ce〓 comes from 5d→4f transition of Ce〓. The measurement of brightness waveform showed that the TFEL of ZnS: Ce〓 was the luminescence from independent centers. and there were the field induced-delocalization in this process anf it〓s the cause of low TFEL efficiency of ZnS: Ce〓. In this dissertation, different influence factors on TFEL of ZnS: Ce〓 were sdudied. The influence of different host lattice is different: The blue/green ratio of ZnS: Ce〓 in hexagonal system of ZnS is larger than that in cubic system of ZnS, and the TFEL peaks in hexagonal system of ZnS moves toward longer wavelength compared with that in cubic system of ZnS. The adding buffer layer was used in this stage. The solubility of Ce〓 in ZnS was small and it was another limit to TFEL brightness of ZnS: Ce〓 device. The solubility of Ce〓 increased ten times when using Li ions as flux, so that the TFEL brightness of ZnS: Ce〓 was enhanced. It was found that the appearing of ZnO in active layer improves the TFEL of ZnS: Ce〓: the brightness and the wave range of ZnS: Ce〓TFEL were enhanced.

本文采用TFEL的分层优化方案，优化组合了各膜层厚度，选择最佳制备条件，得到了ZnS：Ce〓的TFEL；根据Ce〓的能级结构，找到了判别Ce〓的EL的两个简单依据，并据此断定ZnS：Ce〓的TFEL的两个发射峰分别属于Ce〓的〓和〓跃迁；亮度波形测量表明ZnS：Ce〓的TFEL属于分立中心发光，分析认为在此过程中存在着较严重的场致离化，这也是ZnS：Ce〓的TFEL效率较低的一个原因；本文考查了影响ZnS：Ce〓的TFEL的各种因素，发现：基质的晶体结构对ZnS：Ce〓的TFEL有所影响，在六角相ZnS中Ce〓的TFEL优于立方相ZnS中Ce〓的TFEL：发射峰的蓝-绿比相对较大，且光谱向短波方向移动，在此项研究中本文采用了在发光层前增镀过渡层的办法，过渡层为六角晶相的ZnO；限制ZnS：Ce〓的TFEL器件亮度的一个原因是Ce〓在ZnS中的溶解度低，本文用Li离子作助溶剂增大了Ce〓的溶解度，增大幅度为一个量级，并且ZnS：Ce〓的TFEL亮度明显提高；从ZnS：Ce〓的TFEL光谱来看ZnS：Ce〓的TFEL波长覆盖范围较小，亮度也不高，达不到做为白色TFEL材料的要求，需要寻找新的白色TFEL材料；在研究ZnS：Ce〓的TFEL中还发现：发光层中ZnO的出现有利于ZnS：Ce〓的TFEL：发射峰变宽、亮度增大。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。