模拟实验

In addition, volumetric efficiency and the in-cylinder pressure behavior during the intake and compression stroke were obtained and compared with the experimental data.

在容积效率、进气与压缩两冲程之缸内压力方面，其数值模拟值与实验值两者间所显示之差异在5%以内；此外，对三组最大进气阀升程之模拟，其所得之容积效率值在趋势上系属合理。

Field model was used to simulate two types of fire in ISO9705 standard fire chamber; compare and analyse the results with the experimental ones under the same conditions.

用场模拟的方法对ISO9705火灾标准试验间的两种火灾进行数值模拟，并与相同条件下的实验结果进行比较分析。

The learning stage helped subjects obtain useful heuristic information so that they can successfully solve the target logogriph as soon as possible when the target logogriph appeared. We recorded and analyzed high-density ERPs elicited by logogriphs guessed or not.

另外，在&多对多&的实验范式中，由于&干扰因素&的加入，在一定程度上模拟了现实生活中的&原型激活&过程，生态学效度有所提高，很好地在实验室条件下模拟了现实生活中的原型启发现象，即在多个认知事件中激活其中一个相关的有启发作用的原型事件。

Based on the theoretical model coupling Maxwells equation with the rate equation of 4 level inverted population, the numerical simulation is made via the FDTD method and MATLAB programs. The simulation results show that 1. With the increase of the pumping rate, both the localization of the electric field and the spectrum mode numbers will change; 2. The lasing threshold decreases by increasing the size or concentration of the scatters; 3. The lasing threshold also decreases by increasing the size of samples or strengthening the sample randomness.

在理论和实验研究的基础上，利用麦克斯韦方程与四能级反转粒子数的速率方程相耦合的理论模型，采用时域有限差分方法和MATLAB程序对随机激光泵浦阈值特性进行了数值模拟与计算，模拟结果显示：随着泵浦速率的增大，出现了阈值前后电场强度局域态及频谱模式数的改变；随着散射体粒径的增大，浓度的增大，阈值呈现下降的趋势；随着样品长度的增大，随机强度的增强，阈值也呈现下降的趋势。

At last, the experimental results show that the prediction correct rate for 50 unknown samples of gaseous Dimethyl Methyl Phosphonate, Dimethyl Benzene, Sarin, Soman and Phosgene is 98%, and the maximum relative measuring errors of gaseous DMMP and gaseous DMB are 3%.

实验结果表明，本系统对气态甲基磷酸二甲酯与气态二甲苯两种毒气模拟品和沙林、梭曼与光气三种毒气共50 个未知样本预测识别的正确率为98%，两种毒气模拟品的最大相对测量误差为3%。

Through the numerical solution of fluid field and resistance of the trimaran model in different water depth and forward speeds the computational results are compared with experimental data.

通过对不同水深和不同航速下船模周围流场的模拟和对总阻力的求解，并将计算所得结果与实验结果进行比较，表明了FLUENT软件对处理浅水域三体船粘性流场模拟和计算的有效性和准确性，为将CFD软件应用于三体船船舶性能研究的实用性和准确性提供了一些依据。

Secondly, the experimental research advances of cyclopeptide nanotubes using as the templets to produce biosensors by synthesis with functional nanomaterials such as electronic, optical and magnetic ones.

首先介绍了带合适疏水性侧链的环肽纳米管在模拟生物跨膜离子通道方面的实验和理论研究进展，重点论及环肽纳米管的结构、极性和侧链的疏水性等对离子通道传输行为的影响以及分子动力学模拟研究水通道的进展。

The results suggested that macrol/nano sivler could migrate from the chamber into food simulants in the form of micro／nanosized particles, and the maximum migration appears in oilfood simulants.

实验结果表明，微纳米银会从保鲜盒中迁移出来以微纳米尺寸的颗粒存在于食品模拟液中，并且在油性食品模拟液中的迁出量最大。

Based on the numerical simulation and physical simulation results, the Zr41.25Ti13.75Ni10Cu12.5Be22.55BMG super-plastic forging is carried out, and the asymmetry precision ratchets with full shape and clear profile are obtained.

在数值模拟与物理模拟的基础上，进行了Zr41.25Ti13.75Ni10Cu12.5Be22.5块体非晶合金超塑性模锻成形实验，获得了形状完整、轮廓清晰的块体非晶合金不对称精密棘轮。

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。

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％。