查询词典 structure stability

The structure of sulfonated polys from DB is similar to that of sulfonated poly(arylene thioether phosphine oxide)s from TB. The latter could be regarded as the"product"of the former provided that the ether unit of the former was replaced by the thioether unit. The studies illustrated that the latter exhibited much better oxidative stability than the former. This is due to the fact that the thioether unit of the former was oxidized into the sulfone or sulfoxide unit in Fenton reagent, which inactivated the adjacent benzene rings and thus retarded the degradation reaction.

从结构上看，后者可以看成是前者的醚基团被硫醚基团取代后的&产物&，其耐氧化性能比前者好得多，这是因为后者的硫醚基团在Fenton试剂中被氧化成为砜或亚砜基团，而砜或亚砜基是钝化基团，钝化了与之相连的苯环，阻碍了降解反应。

And the deformation and stability analysis of pile foundation with high bridge pier are important technical problems on the basis of understanding the structure characteristics of bearing mechanics.

此时，如何在全面掌握高桥墩桩基础承载机理的基础上进行其变形与稳定性分析，已成为山区高架桥基础工程所面临的重要技术难题。

And the rational design of pile foundation with high bridge pier is an important technical problem on the basis of understanding the structure characteristics of bearing mechanics, deformation and stability.

因此，如何在全面掌握高桥墩桩基础承载机理、变形与稳定特性的基础上，对其进行合理设计，目前已成为山区高架桥基础工程所面临的重要技术难题。

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。

Column aluminum lift platform: three groups of mast platform supporting synchronous lifting, branch structure, with a single mast pole back platform, with a large load capacity and excellent job stability.

三立柱铝合金升降平台：三组桅柱支撑作业平台同步升降，支退结构同单桅柱式平台，具有超大的载重量和优秀的工作稳定性。

The results showed that the toxicity of substituted phenols was mostly determined by molecular chemical activity and the stability of molecular structure.

结果表明，取代苯酚类化合物毒性的大小主要取决于分子的化学活性和分子结构的稳定性。

And the theoretical analyses of this paper show that the new type of gyrotron structure introduced by the author is very advantageous of the stable-frequency output and improving single-mode operation stability, and the efficiency and the output power of the tube can be enhanced due to the effect of the feedback.

理论分析表明，本文所提出的新型回旋管结构极有利于稳频输出和提高单模工作的稳定性；由于反馈的作用，同时亦可提高器件的效率和输出功率。

According to the analysis and computational results in this thesis, although the actual structure and work conditions of the pressure vessel in nuclear power station are much more complex than that of the pressure vessel model, the program FEARPV still can get quite good convergence on the plasticity andcontact iteration. And also the program FEARPV has good value stability, and good regularity. During the heating, compression, constant temperature, constant pressure, cooling and decompression process, the regularity is basically in common with that of the pressure vessel model.

由本文分析计算可知，虽然电站核压力容器的结构及计算工况较压力容器模拟体复杂得多，然而反应堆压力容器瞬态密封有限元分析程序对塑性迭代和接触迭代仍具有很好的收敛性，数值稳定性好，得到的结果具有良好的规律性，在升温、升压、恒温、恒压、降温和降压等过程中其规律和压力容器模拟体基本相似。

Features: I plant production of coconut shell activated carbon, activated carbon with pericarps pore structure developed, large surface area, the absorption speed, wear-resistant high strength, excellent performance, quality and stability, repeated use of renewable and other features, users can also be requested to Raw material processing and production of various specifications of the activated carbon.

产品特点：我厂生产的椰子壳活性炭、果壳活性炭具有孔隙结构发达、比表面积大、吸附速度快、耐磨强度高、性能优良、品质稳定，可反复再生使用等特点，也可按用户要求来料加工和生产各种不同规格的活性炭。

High-speed spindle system should have sufficient rigidity and high precision rotary; light weight, compact structure, small inertia; good thermal stability; vibration and noise; good cooling and lubrication system.

高速主轴系统应具有足够的刚度和高的回转精度；重量轻、结构紧凑，惯性小；良好的热稳定性；振动和噪声小；良好的冷却和润滑系统。

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％。