Off－line Two－Dimensional Gas Chromatography－Mass Spectrometry for Analysis of Essential Oil of Medicinal Herb──Use of Absorption Trap

he use of an absorption trap off-line two-dimensional gas chromatography (2-DGC) in conjunction with a mass spectrometer greatly improved the separation andidefitification of minor constituents of a complex mixture such as a natural essentialoil. The absorption trap device used as an interface of 2-DGC offered the advantageof convenient manipulation.

Observation of the Two-Dimensional Distribution of Impurity Line Emissions Using a Space-Resolved EUV Spectrometer in LHD

A space-resolved EUV spectrometer for measuring the one-dimensional distribution of impurity line emissions in Large Helical Device （LHD） has been upgraded to measure two- dimensional distributions of impurity line emissions with an extension of working wavelength range to 30-650% The two-dimensional measurement is performed by scanning the observation chord horizontally. A rectangular plasma region of 520 × 700 mm2 in vertical and horizontal sizes can be observed during a single horizontal scan. The horizontal scan requires a time duration of 5 s at least. The spatial resolution is 10 mm in the vertical direction when a spatial-resolution slit of 0.2 mm in width is adopted. Although a spatial resolution in the toroidal direction is 75 mm, it is a function of CCD exposure time and horizontal scanning speed. Two-dimensional distribution of EUV line emissions from several impurities has been successfully observed for the first time from steady discharges in LHD. In this paper two-dimensional distributions of He II （303.78A）, C V （40.27A）, C VI （33.73A） and Fe XX （132.85A） located at different radial positions are presented with simple analysis on the magnetic field structure of LHD.

Protein Profile of Human Lung Squamous Carcinoma Cell Line NCI-H226

Objective To construct a database of human lung squamous carcinoma cell line NCI-H226 and to facilitate discovery of novel subtypes markers of lung cancer. Method Proteomic technique was used to analyze human lung squamous carcinoma cell line NCI-H226. The proteins of the NCI-H226 cells were separated by two-dimensional gel electrophoresis and identified by mass spectrometry. Results The results showed that a good reproducibility of the 2-D gel pattern was attained. The position deviation of matched spots among three 2-D gels was 1.95±0.53 mm in the isoelectric focusing direction, and 1.73±0.45 mm in the sodium dodecyl sulfate-polyacrylamide gel electrophoresis direction. One hundred and twenty-seven proteins, including enzymes, signal transduction proteins, structure proteins, transport proteins, etc. were characterized, of which, 29 identified proteins in NCI-H226 cells were reported for the first time to be involved in lung cancer carcinogenesis. Conclusion The information obtained from this study could provide some valuable clues for further study on the carcinogenetic mechanism of different types of lung cancer, and may help us to discover some potential subtype-specific biomarkers of lung cancer.

SkyLine支持下的电力选线三维系统的设计与实现

三维GIS具有表达直观、三维空间分析等特点,可以为电力线路勘测选线提供强大的辅助设计支持及空间分析功能。在分析传统的电力线路选线方法的不足的基础上,提出了三维GIS技术在电力线路选线设计中的应用方法,并着重研究了电力选线三维系统的总体建设内容、三维可视化场景的建设方法和专题应用功能的设计思路,以及应用该系统对实际的电力线路选线设计进行了实践,满足了电力选线的要求。

Three-Dimensional Analysis of Rolling by Twin Shear Stress Yield Criterion

Using the twin shear stress yield criterion, the surface integral of the co-line vectors, and the integration depending on upper limit, Kobayashi＇s three-dimensional velocity field of rolling was analyzed and an analytical expression of rolling torque and single force was obtained. Through redoing the same experiment of rolling pure lead as Sims, the calculated results by the above expression were compared with those of Kobayashi and Sims formulae. The results show that the twin shear stress yield criterion is available for rolling analysis and the calculated results by the new formula are a little higher than those by Kobayashi and Sims ones if the reduction ratio is less than 30%.

High Dimensional Cluster Analysis Using Path Lengths

A hierarchical scheme for clustering data is presented which applies to spaces with a high number of dimensions (). The data set is first reduced to a smaller set of partitions (multi-dimensional bins). Multiple clustering techniques are used, including spectral clustering;however, new techniques are also introduced based on the path length between partitions that are connected to one another. A Line-of-Sight algorithm is also developed for clustering. A test bank of 12 data sets with varying properties is used to expose the strengths and weaknesses of each technique. Finally, a robust clustering technique is discussed based on reaching a consensus among the multiple approaches, overcoming the weaknesses found individually.

Changes of the Proteomic Profiles in Human High-metastatic Large Cell Lung Cancer Cell Line L9981 by Transfecting with nm23-H1 Gene

Background and Objective Cancer metastasis is not only the malignant characteristics of lung cancer, but also the key cause of failure to cure and high mortality. It has been proved

Scaling properties of phase-change line memory

Phase-change line memory cells with different line widths are fabricated using focused-ion-beam deposited C-Pt as a hard mask. The electrical performance of these memory devices was characterized. The current^oltage （I-V） and resistance-voltage （RV） characteristics demonstrate that the power consumption decreases with the width of the phase-change line. A three-dimensional simulation is carried out to further study the scaling properties of the phase- change line memory. The results show that the resistive amorphous （RESET） power consumption is proportional to the cross-sectional area of the phase-change line, but increases as the line length decreases.

镂空重构手法在服装设计中的创新应用

为了打破镂空工艺对材料、技术的使用界限,丰富其在服装设计中的创新应用,通过梳理服装中镂空构型的起源与发展,在镂空重构概念界定的基础上,结合已有案例归纳分析镂空重构的3类实现手法:连接点式镂空、重塑线式镂空以及剪切面式镂空。以连接点式镂空手法为例,进一步探究镂空重构手法在服装设计中的创新实践:一是镂空构型材料层面的创新,将环保理念融入服装设计,实现废弃物升级利用;二是造型表现技术层面的创新,结合立体塑形进行服装造型表现的拓展实践,并对镂空重构手法在服装设计领域的应用前景作了展望。

Evaluation of earthquake impact on magnitude of the minimum principal stress along a shotcrete lined pressure tunnel in Nepal

In situ stress condition in rock mass is influenced by both tectonic activity and geological environment such as faulting and shearing in the rock mass.This influence is of significance in the Himalayan region,where the tectonic movement is active,resulting in periodic dynamic earthquakes.Each large-scale earthquake causes both accumulation and sudden release of strain energy,instigating changes in the in situ stress environment in the rock mass.This paper first highlights the importance of the magnitude of the minimum principal stress in the design of unlined or shotcrete lined pressure tunnel as water conveyance system used for hydropower schemes.Then we evaluated the influence of local shear faults on the magnitude of the minimum principal stress along the shotcrete lined high pressure tunnel of Upper Tamakoshi Hydroelectric Project(UTHP)in Nepal.A detailed assessment of the in situ stress state is carried out using both measured data and three-dimensional(3D)numerical analyses with FLAC3D.Finally,analysis is carried out on the possible changes in the magnitude of the minimum principal stress in the rock mass caused by seismic movement(dynamic loading).A permanent change in the stress state at and nearby the area of shear zones along the tunnel alignment is found to be an eminent process.

基层公务员一元思维方式及其影响机制——一个理论分析框架

底线心态发轫于经管领域,是描述员工关注某项重要事项而忽视其他竞争性事项的一元思维。在公共管理领域讨论底线心态,是为了解释基层公务员在工作中“左支右绌”的行为困境。基层公务员的底线心态具备灵活性特征,据此提出可能的测量方式,并从底线心态的形成机制和影响效应两个方面来揭示其过程。关于形成机制,可分制度、组织、个体三个层面讨论。其中,目标设定、感知问责、上级底线心态、关注自我利益、社会善念以及情绪耗竭等因素对基层公务员的底线心态产生影响;关于影响效应,根据管理效益和社会伦理两个维度,将基层公务员的组织行为划分为四种类型,由此深入阐述不同要素的底线心态对基层公务员不同类型的组织行为的影响。基层公务员底线心态研究能够促进相关理论发展,值得公共管理学者和实践者重视。

“三线六维”卓越数学教师培养模式探索与实践——以忻州师范学院数学系卓越教师实验班为例

卓越教师培养是近年来师范院校普遍开展的工程项目,文章结合忻州师范学院数学系“卓越教师培养”的实践经验,围绕实践教学不断线、“思政教育”不断线、过程评价不断线的三条主线,从培养理念、培养路径、德育养成、技能培养、协同培养、质量评价六个维度对卓越教师培养模式进行了探索与实践。通过“三线六维”模式的实施,实现了卓越教师的培养目标,推动了师范院校卓越教师培养模式的创新,为师范院校卓越教师的培养模式提供可能的参考。

输电导线风噪声声源特性的三维数值模拟

高空输电导线产生的风噪声严重影响建筑声环境,而相关环境噪声预测与降噪措施的前提是获取导线风噪声声源特性。对常用的LGJ-300/25钢芯铝绞线与等直径光滑圆柱建立三维模型,采用基于大涡模拟法和莱特希尔声类比法的混合计算方法进行数值模拟分析,探究导线风噪声特性及其与圆柱之间的差异。结果表明,混合计算方法可有效用于导线风噪声模拟;30 m·s^(-1)风速下,该导线花纹对风噪声影响不大,同轴向长度下导线和圆柱模型数值模拟效果相当。通常导线轴向长度较长,可采取建立小长度元段模型进行声学修正的方法计算单位长度导线的声功率,以提高计算效率。

3D Geology Modeling from 2D Prospecting Line Profile Map

Using prospecting line profile map in combination with drilling and other information for 3D reconstruction of geological model is an important method of 3D geological modeling.?This paper?discusses the theory and implementation method of 2D prospecting line map into 3D prospecting line map and then into 3D model. The authors propose that it needs twice upgrading dimension to reconstruction 3D geology model from prospecting line profile map. The first upgrading dimension is to convert profile from 2D into 3D profile,?i.e.?the 2D points in the 2D profile map upgrading dimensional transformation to 3D points in a 3D profile. The second upgrading dimension is that transform 0D point 1D curve and 2D polygon feature into 1D curve, 2D surface and 3D solid feature. The paper reexamines contents and forms in prospecting line map from the two different viewpoints of geology and geographic information science. The process of 3D geology modeling from 2D prospecting map is summarized as follows. Firstly, profile is divided into several sections by beginning, end and drill point of the prospecting line. Next, a 3D folded upright profile frame is built by 2D folded prospecting line on the plan map. Then, 2D points of features on 2D profile are converted into 3D points on 3D profile section by section. And then, adding switch control points for the long line crossover two segments. Lastly, 1D curve features are upgraded to 2D surface.

基于线结构光扫描的工件高精度三维测量方法

为了提高工业中对复杂轮廓工件的测量精度和效率,设计了一套高精度非接触三维测量系统,并提出了一种基于线结构光扫描的工件轮廓三维测量方法。首先,利用高精度相机和三轴移动平台采集线结构光图像。然后,通过基于差分区间的灰度质心算法,精确而高效地提取出线结构光中心线,并生成原始点云模型。接着,对采集到的点云数据进行必要的点云滤波和精简预处理。最后,将预处理后的点云数据与CAD模型精确配准,进行工件表面轮廓的测量与误差评定。实验结果表明:测量工件轮廓高度的绝对误差小于0.07 mm,相对误差小于0.5%。所提出的三维测量系统及方法测量误差较低,能够实现工件的高精度三维测量,具有一定的工业应用价值。

城市实景模型结构化线面特征重构方法

为了改善城市实景模型边缘模糊,提出了一种曲率引导的结构化线面特征重构方法。根据曲率特征将网格分割为平面、可展凹、可展凸以及不可展曲面4类,在平面分割结果内提取平面,在可展凹和可展凸分割结果内提取直线,对过度弯曲的不可展区域进行保留,最终形成包含几何特征的复合网格模型。结果表明,结合曲率信息预先设置几何特征的潜在范围,使得结构化线面特征更可靠,同时保证城市实景中复杂的树结构不被错误地提取为平面。

基于双目线结构光的三维测量系统研究

针对物体三维重建过程中,传统的双目立体视觉测量法和激光三角测量法存在的局限性,设计了一套双目线激光扫描式三维重建系统。首先,对双目线激光扫描测量系统的结构组成和数学模型进行分析,并推导出在双目对极约束下激光中心线三维点坐标的计算方法;针对传统算法在光条曲率变化较大的区域提取中心线效果不理想的问题,提出了一种基于改进灰度重心法的线结构光中心线提取算法;最后,进行中心线提取精度和效率对比实验,以及三维重建精度实验。实验结果表明,改进算法能够精确有效地提取光条曲率变化较大区域的中心线,平均提取精度达到1.462 pixels,平均提取速度为0.0734 s。同时,设计的结构可以准确地获取物体表面丰富的三维点云数据,测量误差在1 mm以内。

基于多维感知与空天一体的输电线路智慧运维体系建设与实践

基于多维感知与空天一体技术,提出了一种输电线路的智慧运维体系。该体系通过卫星遥感、无人机巡检、智能安防以及多传感器集群等技术的协同应用,实现了输电线路的全方位实时监测与隐患排查。卫星遥感技术用于输电通道环境的宏观监控,精准评估自然灾害和外力破坏风险;无人机巡检技术则提供了高效的多场景应用,包括红外测温、风筝线隐患排查等,极大提升了巡检效率;智能安防系统通过多传感器联控感知,实现了对输电线路环境与设备的三维空间监控与智能预警。实践结果表明,该智慧运维体系大幅提升了输电线路的安全性、可靠性及巡检效率,推动了输电运维技术的革新。

Development of A Three-Dimensional Guidance System for Long-Range Maneuvering of A Miniature Autonomous Underwater Vehicle

The present paper introduces a three-dimensional guidance system developed for a miniature Autonomous Underwater Vehicle（AUV）. The guidance system determines the best trajectory for the vehicle based on target behavior and vehicle capabilities. The dynamic model of this novel AUV is derived based on its special characteristics such as the horizontal posture and the independent diving mechanism. To design the guidance strategy, the main idea is to select the desired depth, presumed proportional to the horizontal distance of the AUV and the target. By connecting the two with a straight line, this strategy helps the AUV move in a trajectory sufficiently close to this line. The adjacency of the trajectory to the line leads to reasonably short travelling distances and avoids unsafe areas. Autopilots are designed using sliding mode controller. Two different engagement geometries are considered to evaluate the strategy＇s performance： stationary target and moving target. The simulation results show that the strategy can provide sufficiently fast and smooth trajectories in both target situations.

On some classes of two-dimensional local models in discrete two-dimensional monatomic FPU lattice with cubic and quartic potential

This paper discusses the two-dimensional discrete monatomic Fermi- Pasta-Ulam lattice, by using the method of multiple-scale and the quasi-discreteness approach. By taking into account the interaction between the atoms in the lattice and their nearest neighbours, it obtains some classes of two-dimensional local models as follows： two-dimensional bright and dark discrete soliton trains, two-dimensional bright and dark line discrete breathers, and two-dimensional bright and dark discrete breather.