长信号

The airgun signal was detected all along the line of the largest offset equal to 185 km, seismic phases Pg, Pc, P2, PmP and Pn have been picked successfully, based on which 1-D forward modeling of deep crustal structure has been conducted and the low-velocity layer of crust-mantle transition zone has been discussed.

在185km长的测线上均记录到了气枪信号，成功检测到Pg，Pc，P2，PmP和Pn等多组震相，并在此基础上对地下深地壳结构进行了一维速度结构正演，讨论了该区域壳幔过渡带的低速结构。

The platform of diffraction data collection and analysis for protein crystalAccording to the characteristics of Hefei Light Source,based on the XRDS Station in NSRL at USTC,the experiment platform was set up for measuring sulfur anomalous scattering signal with long-wavelength X-ray.

蛋白质晶体衍射数据采集及数据分析的平台根据合肥光源的特点，依托中国科学技术大学国家同步辐射实验室X射线衍射与散射实验站，搭建了适于测量硫元素反常散射信号的长波长X射线衍射实验平台。

In engineering and laboratory research, the dynamic long perioriodic and aperiodic waveform singals are often required.

在工程和实验研究中，时常要求动态地提供连续的长周期或非周期的复杂信号。

It is found that the spectrum has the chaotic features in time domain-long range independence and aperiodicity.

通过频谱分析，发现载荷谱具有混沌信号在时域上的特征——长程不相关性及非周期性。

Based on the analysis mentioned above, arc light sensing was introduced into practical welding process systematically and was improved with spectral method for the first time.

在GTAW过程中，建立了弧光信号同弧长的对应关系。

To better understand the roles of LsrA protein in nodulation, a series of analyses of nodules using scanning electron microscopy, genetic and biochemical approaches have been carried out. Our analyses suggest that the lsrA1 nodules contain bacteroids in the invasion and establishing zone only. The lsrA gene expression is active early in the invasion zone and activated later than bacA genes. The lost of LsrA protein dramatically reduced the expression of nifA and fixK, and completely blocked the expression of the nifH gene for nitrogenase. LsrA protein functions early in the bacteroid development and it is essential for the development nitrogen fixing bacteroids.

前期的工作中，苜蓿中华根瘤菌Rm1021中90个候选LysR基因已经被定向插入突变，并筛选在自生生长时期、共生生长时期的表型，以期寻找更多在自生状态或共生固氮中有功能的LysR转录因子。1 针对前期鉴定出的共生固氮必需的lsrA基因，我们应用了一系列扫描电子显微镜技术、生物化学、分子遗传学等方法，发现lsrA基因主要在根瘤侵染区开始表达，表达时序也在侵染阶段左右，但晚于bacA基因表达；LsrA蛋白缺失后根瘤固氮区中缺乏具有固氮能力的类菌体，nifA和fixK基因的转录水平降低，nifH基因的转录被完全阻断，因此LsrA蛋白为根瘤发育所必需，是新的根瘤发育信号传导途径成员。2 通过表型筛选我们鉴定了苜蓿中华根瘤菌的oxyR基因，并研究了它的调节特性。oxyR突变后，苜蓿中华根瘤菌对过氧化氢敏感性提高，适应性降低。

But Astropulse searches for broad-band transmissions that are spread across a 2.5 MHz band of the spectrum.

但是 Astropulse 搜寻的是分布在一个长 2.5 MHz 的频率区间的宽频带信号。

My sisters, who were always ready first, would await the signal for leaving; but at the last minute some one always found a spot on my father's frock coat, and it had to be wiped away quickly with a rag moistened with benzine.

我的姐姐们，总是整装一新，早已迫不及待地在那里等候出发的信号。不过到了最后，总有人发现父亲的长礼服上有污渍，于是不得不马上用浸着汽油的破布揩去。

Our company develops QC-80D three-layer high-pressure physics foaming assembly line which is special to design for produce railway signal cable, high-quality data cable core wire and insulation cable core of automobile electronic wire leather—foam—leather.

成都青长电子设备有限公司研制的QC-80D型三层共挤高压物理发泡生产线是为生产铁路信号电缆、以及其它高质量的数据电缆芯线和汽车电子线芯皮--泡-皮绝缘线芯而说设计的，采用高压氮气注入发泡以及三层共挤工艺，使绝缘线芯获得高质量的性能。

The largest of the microbats, this white-furred cave dweller found across northern Australia also counts lizards and frogs among its prey, and uses its eyes as well as sonar to hunt.

它们也是微蝠中体形最大的一种，身上长有白毛，居住于洞穴之中，分布遍及澳大利亚北部，蜥蜴和青蛙也属于其捕猎对象，捕猎时除了利用声纳信号之外，同时还利用眼睛。

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％。