后循环的

a scheme of channel estimation using cyclic prefix based on the measurement of the low-voltage power line channel model is presented.after obtaining the frequency response of pilot sub-channel under the state of comb-type pilot,the data sub-channel response is obtained by interpolating the frequency response in frequency direction.in the pilot-free data period,the estimation of the channel is carried out by using cyclic prefix in order to improve the performance of system error rate.

摘 要：通过实际测量给出低压电力线的信道模型，在此基础之上提出了利用循环前缀对信道进行估计的方法，即在梳状导频模式时，使用导频获得导频子信道频率响应后，对其在频域方向进行插值得到数据子信道响应，在其后没有导频的序列的数据周期内，使用循环前缀对信道进行估计，从而起到改善系统误比特性能的目的。

The results show that the periodic average yield of acrylonitrile under any forced periodic oscillation of oxygen concentration among this experimental conditions,thus obtained could higher than that under the steady-state condition.

而为完成整个氧化还原循环过程，气相氧分子就必须在不同丙烯吸附中心的再氧化中心上吸附，获得电子，解离后扩散进入催化剂中的阴离子孔穴，如图1所示。从该机理可知，反应气氛中的氧烯比大小对催化剂表面的氧化还原反应过程的循环有重大影响。

Methods Six cadaveric lumbar vertebrae were harvested and evaluated with dual-energy x-ray absorptiometry and quantitative computed tomography to assess bone mineral density. Matched, polyaxial pedicle screws were then randomly assigned by side and placed using the Magerl, Krag or caudad trajectory technique assisted by Iso-C 3D scan and 3D navigation system. Cyclic loading tests were performed with a maximum 250 N load at 3 Hz up to 30000 cycles while recording load and displacement. Stiffness quotients were calculated it comparison.

从尸体中获取6节腰椎椎体经DEXA和QCT检测骨密度值，证实为骨质疏松后在计算机导航下按随机分组的方法向12个椎弓根中置人不同方向的椎弓根螺钉，使用MTS-858生物力学仪脊柱力学测试平台进行±250N的循环负荷疲劳测试，记录负荷循环中的螺钉位移，计算系统的刚度系数并进行对比分析。

Platelet counts were dropped dramatically in animals that received antibody injection within 4 h, maintained at the mini-mum level for a period of 44 h, started to rebound after 48 h, and reached to the maximum at 144 h (6 days). Final homeostasis reached at approximately 408 h (17 days), following a minor cycle of platelet number fluctuation.

模型小鼠在抗体注射4h血小板数量大幅降低，维持在低水平达44h，48h后开始恢复，至144h（6天）数量达到最高点，其后又经过一个小的降升循环，在408h（14天）后恢复到初始水平。

To detect effects on apoptosis of cortex neuron in DHCA rats, the rat model of occluding bilateral common carotid artery in the deep hypothermic (21C) rats had been established, and flow cytometry, TUNEL, electron microscope, immunohistochemistry and RT-PCR had been studied.: part I: To establish a new rat model of cerebral ischemia/protect during DHCA: 20 SD rats were used in the experiment, little animal respirator was to assist anesthetized rat's respiration after tracheal cannula, artery press through artery spile in femoral artery, electrocardiograph, temperature, blood saturation of O2 (SaO2) and arterial blood gases were monitored during the whole experiment, blood flow of bilateral common carotid artery of rat were occluded about 60 minute when its temperature was reduced to 21 C by ice, then normal temperature was resumed.

本研究采用大鼠深低温颈总动脉阻断模型，应用流式细胞仪、电镜、原位缺口末端标记法、免疫组化法和RT-PCR技术分别检测深低温脑缺血对皮层神经细胞调亡的影响方法：第一部分深低温停循环脑保护大鼠模型的建立：SD大鼠20只，麻醉后气管插管辅助呼吸，用冰块将大鼠的体温降至(21±1)℃，阻断双侧颈总动脉，记录体温、心率、血压、血氧饱和度和血气分析，60分钟后恢复颈总动脉血流，用Longa等的5级评分标准评定4小时和24小时后大鼠神经系统损伤情况。

The experimental results indicate that the changes of resistivity, temperature and deformation during freeze-thaw cycles are real-time and synchronical, which also proves that it is feasible to study the change of soil structure during freezing and thawing by using electrical resistivity method.

试验结果表明：冻融循环过程中电阻率与冻融变形的变化是实时的、完全同步的，利用电阻率特性研究冻融过程土体结构变化是可行的；每次冻融冻土电阻率随着冻融次数增加呈指数关系减小，融土电阻率随冻融次数增加呈指数关系增加；每次冻胀量与融沉量随冻融次数的增加而减小，平均干密度随冻融次数增加而增加，并且经过5次冻融循环后冻胀融沉量和干密度均趋于稳定。

Results:pedunculated omentum majus-cirded trachea transplantation ensured an early re-establishment of blood circulation of transplanted trachea and maintenance of its normal animate states; allogeneoilc transplantation of trachea activated bodys immune mechanism. resulting in a chronic process of rejection and finally leading to progressive necrosis of transplanted trachea tissues: chondroregeneration occurred at every period under perichondrium after transplantation. and the degree of regeneration was related with favorable blood circulation; the emplogyment of a supporting tube in trachea,under the condition of favorable re-establishment of early blood circulation, could preventgranulation tissue hyperplasia and keep trachea cavity unobstructed.Postgraduate Ding XiaoQuan Directed by-Lin LeShen

结果 带蒂大网膜包绕移植段气管行腹腔移植，早期重建了移植段气管的血液循环，保证了移植气管的早期成活及维持其正常生机状态；同种异体气管移植所激发机体的免疫机制，引起一个慢性排斥反应过程，导致移植段气管组织进行性坏死；软骨再生存在于移植后各个时间段，其再生程度与良好的血液循环有关；气管内支撑管的应用可防止肉芽组织增生堵塞管腔，从而保证气管管腔通畅。

Degree of myocardial damage of ECC operation with the video-assisted thoracoscope is conspicuous about two hours after ECC stopping, but does not deteriorate.

幼龄犬胸腔镜体外循环术后的心肌损伤程度可能以停机后2 h最明显，后未再出现持续性加重。

This new type seperator gives a beutiful future for the solving of the problem. Besides of this, the seperation function and structive ameliorations of uniflow square seperator and finned tubes seperator were studied systemly, and with the contrast with other type of separtors, have higher seperation efficiency. The uniflow square seperator can reach a much ligh seperation efficiency when it was ameliorated.

并对新型下排气方形分离器和鳍片管束惯性分离器的分离性能和结构优化进行了系统的研究，在对其它几种分离器研究的同时进行了对比，指出方形下排气分离器在结构优化后可达相当高的分离效率，与常规圆形分离器相当，能承担高倍率循环床的物料循环，结构布置得到极大的简化。

Cerebral angiography demonstrated basilar arteries spasm on SAH Day 5.(3)TEM demonstrated desquamation of endothelial cells, chromatin condensation, vacuolated cytoplasm and other morphological changes similar to atypical apoptosis.

脑血管造影见CCA结扎后兔基底动脉迂曲、扩张、延长，颅内外侧支循环增多；（2旧AH后所有动物的饮食量下降，神经功能出现障碍，oBF亦下降，以第4～5天为著。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。