能够...

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

In eukaryotic cells,Toll-like receptors in endosomal membrane were show to recognize viral RNA in endosome and thereby initiate innate immunity pathways for virus resistance.By contrast,a cytosolic RNA receptor protein, RIG-Ⅰ(retinoic acid inducible gene-Ⅰ),has recently been identified for recognition of the viral RNA.

在真核生物体内，除了定位于内吞体膜上的TOLL样受体能够识别入侵机体的病毒RNA，启动机体抗病毒的固有免疫反应外，近年来发现了另一种能够识别病毒RNA的细胞质内受体——RIG-Ⅰ。

"Sheldon Engler, a Bank of america senior economist who specializes in Europe, also expects the dollar to weaken relative to European currencies, further helping U.S. exporter s."

美洲银行专门研究欧洲市场的高级经济学家Sheldon Engler期望美元与欧洲货币相比能够有所贬值，这样能够进一步促进美国的出口。

"Sheldon Engler, a Bank of america senior economist who specializes in Europe, also expects the dollar to weaken relative to European currencies, further helping U.S. exporters."

美洲银行专门研究欧洲市场的高级经济学家Sheldon Engler期望美元与欧洲货币相比能够有所贬值，这样能够进一步促进美国的出口。

The new buzzword engrained itself in popular culture, while scientists set for themselves the ambitious goal of creating a computer that would ace the Turing test, i.e., pass as a human in prolonged conversation with one.

当时的科学家们雄心勃勃地想要制造出一台能够通过图灵测试的机器，即能够长时间地与人类交谈而无法被认出是机器。

Results: Gd-enhanced MRI enabled to make differentiation between physeal and epiphyseal cartilage and reveal epiphyseal vascular canals.

结果：Gd增强MR成像能够区别骨骺软骨和生长板软骨，能够显示骨骺内的血管槽。

We have therefore no right to be sceptical, nor to content ourselves with an inspection of a town to the exclusion of a consideration of its power; but we may safely conclude that the armament in question surpassed all before it, as it fell short of modern efforts; if we can here also accept the testimony of Homer's poems, in which, without allowing for the exaggeration which a poet would feel himself licensed to employ, we can see that it was far from equalling ours.

因此我们无权怀疑，也不能观察一个城镇不考虑他本身的实力影响；但是，虽然他留下的影响很小，我们仍的确能够得出结论他的军事实力超过以往之前的；如果我们能够接受Homer诗中的说法，除却诗人所做的夸大之词，我们可以发现和我们的想象相去甚远。

Responsibilities:Specification of welding machinesProgramming and assembly Testing, quality control and de-buggingInstallation at customer site Design of metal structures and basic machine partsMachine maintenanceAble to manage 1 electrical workerAfter sales supportRequirementsCollege degree in Mechanical EngineeringAble to read and speak English CET Level 65-10 years work experienceAble to read and produce working engineering drawingsAble to solve electrical and mechanical problemsBasic understanding of welding will be an advantageMale, age 30-45Totally honest and trustworthyHigh level of maturity

工作内容：对焊接机器编制使用说明规范设计和装配焊接机器测试，调试机器以及质量控制在客户方进行机器安装设计简单的金属结构和基本机械部件机械的日常保养管理电工售后服务支持职位要求：工程学士学位大学英语6级，出色的阅读和听说能力 5-10年工作经验能够阅读生产工作的工程图纸能够解决电气和机械问题有相关焊接经验的优先男性，年龄30-45 诚实守信，成熟稳重 Mechanical Machine Engineer

After our study, we got four new results. Firstly, it is feasible to use the wavelength stabilization feedback system to these high average power FELs. We can get stabilized wavelength lasers and the facilities can work stably.

我们得到了四点结论：首先，在这样高平均功率的FEL上加载稳定波长的反馈是可行的，能够很好的稳定住波长，并且系统能够稳定的工作。

The felted and foam electrode constructions with 90 to 95% porosity contain about 10 to 15% more active material with a concomitant increase in capacity but lower rate capability.

纤维和发泡镍电极结构有90％到95％的孔率，能够多包含10—15％的活性物质，能够增大响应的容量，但是会减小倍率放电的能力。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。