采样

The adopt the analytical method announced by environmental protection administration NIEA A715.12B "volatile organic compounds detection method at air - stainless steel canister/analyze mass spectrograph of gaseous phase ", to effectively analyze the air samples inside the station, to find out the space distribution and concentration of volatile organic compounds at the service station.

研究分析方法采用环保署公告NIEA A715.12B「空气中挥发性有机物检测方法－不袗采样筒/气相层析质谱仪法」，期望有效分析加油站内空气样品，对站内空气中各挥发性有机物物种进行定性与定量分析，以了解站内挥发性有机物空间分布与浓度分布情况，提供国内相关资料库与相关立法规范参考。

Figure 16 shows that system timing margin is maximized by keeping TINIT and TRC as short as possible and by locating the master sample time during read time slots towards the end of the 15μs period.

插图16显示了最大化系统时间宽限的方法：让TINIT 和TRC尽可能的短，把主机采样总线放到15μs这一时间段的尾部。

Simulation results indicate that the algorithm can reach the same convergent performance by using half samples as the sample matrix inversion algorithm.

仿真结果表明，此算法用采样协方差求逆类算法一半的样本数就可取得相同的收敛性能。

The relationship between selecting range of controlled weighted factor and state matrix norm of discrete state equation is proposed when multi-step predictive selftuning control algorithm is adopted.

4提出了多步预测的自校正控制GPC算法控制加权因子的选择范围与离散状态方程状态矩阵范数之间的关系，给出了其它参数的选择方法，通过不同采样周期条件下仿真和实验研究与理论计算结果是一致。

This approach was based on the NonSubsampled Contourlet Transform. The means and variables of NSCT coefficients matrix in different subbands and various directions were extracted to form the feature vectors which were regarded as indexes of texture images in image database. Two similarity functions were used to compute the similarity between images. A texture retrieval system based on query image was developed.

该方法利用非下采样Contourlet变换对图像进行分解，提取不同子带和不同方向变换系数矩阵的均值和方差为特征向量，作为数据库中纹理图像的索引，并利用两种不同的相似度函数计算图像之间的相似度，建立了一套基于示例查询图像的纹理图像检索系统。

A Special Maximum Likelihood method for building mathematical models in dynamic calibration is proposed, which is a kind of maximum likelihood method with a special noise model.

提出了误差估计表达式以及在带宽有限测量假设条件下，辨识离散时间模型时，采样频率的选择与模型辨识误差的关系。

To meet the common demands of the heterodyne signal process system, a phase measurement system based on dual-differential phase discrimination is studied and applied. With the frequency range of 5kHz-50kHz, this system has sampling rate of 10/sec, stability of ±0.0036°, maximum error of ±0.06°, and it can measure the zero point of phase angle.

围绕高精度外差信号处理系统的一般要求，研究和实现了基于双向差动鉴相的相位测量系统，在5kHz-50kHz的范围内、采样速率10次／秒时，示值稳定性优于±0.0036°，最大误差小于±0.06°，可以测量零相位。

A piece of memorizer 6416 act as extend of external memorize in which the program and data space are 32K respectively.

对外部的液晶显示器、开关量采样单元和串行扩展口进行了独立的地址分配。

The paper firstly introduces the background, the present situation and meaning of the research on the embedded system. The research of key technologies of embedded ethernet remote measure and control system is carried out in this paper. Then the author detailedly illustrates the design process of hardware and software of the embedded remote measure and control system. The design process includes the selection and configuration of the 32-bit microprocessor, the selection of the memorizer, the selection and software design of the Ethernet Controller, the realization of AD data acquisition model and DA converter model.

本文论述了嵌入式系统的研究背景、研究现状及研究意义，对基于嵌入式技术的以太网远程测控系统关键技术进行了研究，详细介绍了系统的软硬件设计过程，包括32位微处理器的选择与配置、存储器的选择、网络控制器的选择及软件设计、AD采样模块与DA数模转换模块等外围电路的实现。

Results: The good linear range of method was 10 to 1000μg/ml (T=0.9999) with the correlation coeffivient of 0.9999, and the limit concentration in air was 0.2 mg/m^3 with the average relative standard deviation less than 5%(n=6). The average sampling rate ranged from 96.6 to 100%, and the breakthrough capacity of l00mg activated charcoal was 4.7mg. The average desorption rate was 97.6%, and mesityl oxide absorped in activated charcoal tube was stable for 7 days and can be detected accurately with other gas coexisting in the air of workplace.

结果：异亚丙基丙酮浓度在10~1000μg/ml内呈良好线性关系，相关系数0.9999，最低检出浓度为0.2mg/立方公尺，相对标准偏差＜5%(n=6)；气体采样效率≥96.6%，100mg活性炭对异亚丙基丙酮的穿透容量为4.7mg，平均解吸效率97.6%；活性炭样品室温下可保存7天；丙酮、丁酮、异佛尔酮、苯、甲苯、二甲苯等共存物不干扰测定。

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。