等径的

The particle size and distribution were determined by transmission electron microscopy and laser particle size distribution analyzer, ultraviolet-visible absorption curve was also characterized.

通过透射电镜、激光粒度分布仪等测定了纳米颗粒的粒径和分布情况，并对纳米金溶胶的紫外可见吸收曲线进行了研究。

Finally, the influence of shear rate and the number density and aspect ratio of the fibers are discussed.

最后讨论了纤维的浓度和长径比等因素对悬浮流微观和宏观性质的影响。

The electrostatic spray experiments were performed. The average diameter and the charge to mass ratio of droplets and droplet deposition were obtained.

在实验室内进行了喷雾特性试验，得到了雾滴的平均粒径、雾滴荷质比及雾滴的流量密度等。

Moreover, we found that there was no direct relationship between visual problems and downward herniated optic chiasma in patients of empty sella syndrome.

此外吾等亦发现此类病患视觉上的问题与视径交叉之下凹无一直接的关係。

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

This is a professional manufacturer of miniature bearings, the diameter of the main producing 1-15mm, the following 30mm diameter The metric system, British, the series flange bearings, stainless steel bearings, plane thrust ball bearings, linear bearings, needle roller bearings, bearings, and other types of ceramic micro-bearings and sales agent in Japan NMB, NSK, EZO.

本公司是微型轴承专业制造商，主要生产内径1－15mm、外径30mm以下的公制、英制、法兰系列轴承，不锈钢轴承，平面推力球轴承等各类微型轴承，并代理销售日本NMB，NSK，EZO。

Ltd. onbearing miniature bearings are professional agents, the main products have EZO NMB NSK IJK JAPAN diameter 1-10mm, outer diameter less than 60mm Metric, Imperial, flange series bearings, stainless steel bearings, plane thrust ball bearings and ceramic ball various types of bearings, such as miniature bearings.

上海普力轴承有限公司是微型轴承专业代理商，主要产品有日本EZO NMB NSK IJK 内径1－10mm、外径60mm以下的公制、英制、法兰系列轴承，不锈钢轴承，平面推力球轴承和陶瓷球轴承等各类微型轴承。

The correlation among main yield and fiber traits of upland cotton with high fiber quality was investigated by using correlation and path analysis methods.

利用单相关、偏相关和通径分析等多种相关分析方法，研究了纺高支纱陆地棉主要产量、品质性状间的相关关系。

X-ray diffraction, transmission electron microscope and vibrating simple magnetometer were used to characterize the crystallization, microstructure and the magnetic properties.

利用XRD、TEM及VSM等对样品的粒径，分散性，物相组成及磁性能进行表征并讨论。

A software high frequency channel simulation algorithm is presented aiming at the characteristics of HF channel which has unrepeatability, multipath and fading.

针对短波信道不可逆性、多径以及衰落等特点，提出了一种纯软件的短波信道仿真算法。

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。