结构稳定性

The results show that mistuning is always beneficial to alleviating flutter, that the alternative and the optimum distribution of mistuning have nearly same effects on alleviation flutter under intensive structural coupling and mistuning is limited in the improving of the stability of the system.

研究表明，错频对抑颤总是有利的，在较强的结构耦合作用下，交叉错频分布与最优错频分布具有相近的抑颤效果，且错频对提高系统的稳定性是有限的。

This paper studies the thermal decomposition of a number of dithioesters,trithiocarbonates and xanthates and gives their decomposition rates at various temperature and Arrhenius plots for K_d values.

分析了链转移剂结构对热稳定性的影响，并给出了它们热分解的活化能和指前因子。

A new method unfolding soft X-ray spectra for a soft X-ray spectrometer,which is based on maximum entropy principle,is put forward.

提出软X光能谱仪的一种新的解谱方法即最大熵法，运用新的平滑方法即样条拟合方法处理滤片的边带结构，并对最大熵法的收敛性和稳定性进行了分析。

In the middle of the mosaic structure of landscape factors, alpine plain is the most complicated and stablest; the complexity and stability of the natural oasis is greater than that of the man-made oasis.

在各景观要素的镶嵌结构中，高山草原是最复杂，同时也是最稳定的；自然绿洲的复杂性和稳定性都大于人工绿洲。

The thermal decomposition and phase inversion processes of the gel precursors, crystal structure, phase stability against reduction and microscopic morphology of the sinters were studied by using TG/DTA, FTIR, XRD and SEM.

通过TG/DTA， FTIR， XRD， SEM和直流四引线法系统研究了凝胶前驱体的热分解及其相转化过程和烧结体的结构、相稳定性、微观形貌、电导率以及电输运机制。

Nanocrystalline titanium silicides were synthesized by co-reducing silicon tetrachloride and titanium tetrachloride with different metal reductants at 650℃.

具体内容如下： 1、以硅粉和VCl〓为原料、以金属钠为还原剂，在650℃的氯化镁和氯化钠组成的熔盐中，通过还原硅化法成功合成了具有六方相结构的颗粒平均直径约为35纳米的VSi〓纳米材料，产物在1000℃时具有很好的抗氧化稳定性。

The results indicate that the resultants exhibited high thermal stability because of core-shell structure.

用热重分析、SEM、XRD、FIRT等对复合电极材料的组成、结构、形貌和热稳定性进行分析和研究。

But the airborne radomes mostly are sandwich shells, the finite element analyses of them deal with various knowledge such as thin shell、 sandwich shell、buckling、free vibration and random vibration theories.

而机载雷达罩多数是夹层壳结构，对它们进行有限元分析涉及到薄壳、夹层壳、稳定性、自由振动和随机振动等多方面理论。

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。

In production of jams and jellies, sweetened fruit juices or purees are concentrated to provide shelf-stability to microorganism growth and to produce the desired firm texture.

在酱和果冻的生产中，加糖的水果汁或果泥浓缩后可以防止微生物生长提高货架期的稳定性，并产生理想的组织结构。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。