层

The packet error rate and channel estimation are used to compute the adaptive threshold in order to maximize spectral efficiency under given delay and error performance constraints.

该技术结合了传统物理层自适应调制和链路层自动请求重发，利用链路层的误包率和信道估计参数计算自适应调制门限，在系统给定时延和误包率约束的基础上最大程度地提高了频谱利用率。

Hematoxylin-Eosin dying method is used to discover the microstructure of the spermatheca by light microscope.

采用HE法对中华蚌锰受精囊的显微观察显示，受精囊的囊壁结构由内向外可分为内膜层、上皮层、基膜、肌肉层、结缔组织、围脏膜六层。

The results show that this spicule has the complex hiberarchy: the first tier is nano silica particles; the second tier is the sub-rounds within one silica round; the third tier is silica rounds composed of several parallel sub-rounds; the fourth tier is homocentric round structure with alternant deposition of silica and organic matrix.

结果表明，这种海绵骨针具有复杂的四级结构：第一级是纳米硅球；第二级是二氧化硅层内的亚层结构，第三级是单层二氧化硅层；第四级是二氧化硅－有机基质复合的同心圆结构。

With the author's study of related issues, this paper focuses on some key technologies of the physical layer, the data link layer and the network layer. The physical layer protocol is based on the hardware abstraction provided by TinyOS, and adopts split-phase mechanism for transmission.

本文研究了基于TinyOS操作系统的新型无线传感器网络通信协议栈GHPS(Generic Hierarchical Protocol Stack)，着重设计并实现了该协议栈中物理层、数据链路层及网络层的一些核心关键技术和功能模块。

The second layer establish the office and reading stack and the room for discussion, the third layer establishs the reading room of Periodical and reading stack.the fourth layer establishs the electronics reading room and reading stack.

平面柱网采用：7.3%26times；5.4米，图书馆主楼为四层框架结构，图书馆一层设有图书验收、装订、编目、典藏、采编，二楼设有办公室及期刊阅览室、学生普通阅览室、教师阅览室，三层设有学生专业阅览室、外文阅览室、书库。

Changing the layer stack-up style changes the way that the core and prepreg layers are distributed through the layer stack.

改变了风格层堆叠的方式改变为核心，预浸料层是通过分布层堆叠。

The results show that a MgSnO3·H2O conversion film is formed by treatment in the stannate solution at 90℃, and the immersion test and potentiodynamic polarization show that the corrosion resistance of the AZ91D alloy is improved to some extent.

结果表明：锡酸盐转化处理后合金表面形成了以MgSnO3·H2O为主要成分的转化膜，可对合金起到一定的防护作用；转化膜由细小的球形颗粒密积而成，颗粒之间存在间隙，它可以为化学镀镍的前处理过程提供良好的吸附条件；转化膜上的化学镀镍层组织致密、无缺陷， MgSnO3·H2O转化膜在镀镍层与基体之间起到过渡作用，镀层的磷含量达到9%，与基体结合良好；在3.5% NaCl (pH=7)溶液中的动电位极化测试表明，镀镍以后的合金在阳极极化过程中发生了明显的钝化，耐腐蚀性能进一步提高，对基体起到了较好的防护作用。

Their shells, which apart from hydrogen, helium, and carbon also contain portions of the heavy elements formed in the stellar core, are inherently unstable, and their pulsing creates a withering stellar wind a billion times stronger than the solar wind we know today.

它的壳层除了氢层、氦曾和碳层外还有包含一部分产生自恒星核心的重元素，天生的不稳定，它们的脉动产生了一种毁灭性的星风，比我们现在知道的太阳风要强数百万倍。

The liner is a polymeric elastomer coating between propellant and insulation layer or case.The liner-forming is a special step in production of solid rocket motor.

衬层是推进剂与绝热层或壳体之间的高分子弹性体涂层，衬层成型是固体火箭发动机生产中的一种特种工序。

In order to study the stability of stratified rock slope in Zhu-Cheng road and its reinforcement method, the potential deformation and slipping mechanism of slope were analyzed using insitu-investigation and stereographic projection analysis method. The numerical calculation model for stratified rock slope was founded with UDEC software. The deformation of rock mass was analyzed in the excavation procedure, and the long-short compound bolt reinforcement structure was proposed according to the deformation failure mode of stratified rock slope.

摘 要：为了研究竹城公路层状岩质边坡的稳定性及防治措施，通过现场调查和赤平投影分析边坡潜在变形滑动机理；利用UDEC软件建立层状边坡数值计算模型，分析开挖过程中岩土体的变形情况；根据变形破坏模式提出层状岩质边坡的长短锚杆交替复合支护结构。

They go to town. Would you just ask them?

他们在城里你能问他们吗？

Ossein pretreated for a2 weeks period exhibited the maximum% yield incase of bone gelatin, while the yield from intact skin was higher than that realized incase of de-scaled skin.

预处理时间达2星期的骨胶原表现出最高的骨明胶百分产量，然而从未处理鱼皮中得到的产率比去鳞的鱼皮得到的要高。