查询词典 investigations

Det. 632, Air Force Office of Special Investigations

空军特别调查局 632 分遣队

In this dissertation, starting from commercial change of Lintan County as a subject, using field investigations and case interviews of sociology as main methods combined to related theories and methods of economy, ethnology and anthropology, conducting a deep study of business change of Lintan Hui's merchants as well as it's spirit, in order to making up the blank of this study field.

本文以临潭回族的商业变迁为研究课题，以社会学的田野调查和个案访谈为主要手段，结合经济学、民族学、人类学和人口学的相关理论和方法，对20世纪以来临潭回族的商业结构变迁、商业类型变迁以及临潭回商精神作了较为深入的研究，以期弥补这一领域研究的空白。

As for the evaluation of translating effect, we can conclude it fromthe further theoretical analyses and detailed questionnaire investigations of the two versions of "Autumn Thought" that Schlepps strategy, literal translation is more suitable in poetry translation.

对于翻译效果的评价，本文通过理论和问卷对《天净沙·秋思》的两个译本进行深入分析比较，得出结论：Schlepp所使用的直译方法更适合应用于古代诗歌翻译。

Investigations in this paper provide a fully new way for the design of high-rise steel residences.

本文在该方面的研究为中高层钢结构住宅提供了全新的抗震设计思路。

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。

Experimental investigations on the combustion process of a liquid hydrocarbon fuel ed scramjet, ignited by hydrogen pilot flame, and with four different inlets, were conducted in free-jet tests, which simulated the fly conditions of Ma=6 and H=25km.

在模拟飞行马赫数Ma=6，高度25km条件的液体碳氢燃料超燃冲压发动机自由射流试验中，对比研究了4种不同进气道，不同燃烧室入口条件下模型发动机的点火与燃烧性能。

Experimental investigations on the combustion process of a liquid hydrocarbon fueled scramjet, ignited by hydrogen pilot flame, and with four different inlets, were conducted in free-jet tests, which simulated the fly conditions of Ma=6 and H=25km.

在模拟飞行马赫数Ma=6，高度25km条件的液体碳氢燃料超燃冲压发动机自由射流试验中，对比研究了4种不同进气道，不同燃烧室入口条件下模型发动机的点火与燃烧性能。

The results of the vegetative production investigations showed that propagule are mainly produced after fruiting.

对营养繁殖能力的调查结果显示，禾草的营养繁殖体主要产生于果后营养期。

A few years later, Fiolla's investigations led her to corruption in the office of the Prex.

几年后，菲奥拉在查案过程中发现了董事长办公室的腐败。

Beijing responded by launching anti-dumping investigations into imports of US car parts and poultry.

北京方面对此的反应是，发起对从美国进口的汽车零部件和肉鸡产品的反倾销调查。

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。