位移位功能指令的应用

可编程控制器的每一条功能指令相当于一个子程序,位移位指令目标操作数主要由位元件构成,其长度不受限制,使用比较灵活。利用彩灯移位控制程序,通过对比基本指令和步进指令的编程,进行了位移位指令的具体操作和应用。

超声心动图房室环位移法测定器质性心脏病患者左心室舒张功能（摘要）

超声心动图房室环位移法测定器质性心脏病患者左心室舒张功能（摘要）江苏省扬州市第一人民医院心血管病研究室杨华孙红光季家凤陈忠培凤以良何黎民孙晓宁本文报告应用超声心动图测定房室环移动的幅度来评价器质性心脏病患者左心室舒张功能状态。１对象与方法对象受...

逐次位移法实现井身轨迹插点计算

在详细分析位移插值法计算插点轨迹参数不精确的原因基础上,提出了逐次位移法实现井身轨迹按位移插值计算的新方法,介绍了编制计算机软件的思路,并给出了计算实例。在几百口井、几千次插值计算的结果表明,该方法计算精度及可靠性很高。

轴位移法测定GRIN透镜的折射率分布系数

本文对GRIN透镜的精确光线追迹公式作了推导,介绍了轴位移法对透镜折射率分布的测量方法及相应的数据处理,并对测量误差进行了分析和计算,从而对测定GRIN透镜折射率分布提供了一种精确而且实用的方法。

轴位图像位移——颈、腰椎椎间盘CT序列扫描值得重视的问题

笔者在CT阅片时发现，轴位图像位移并非罕见，如果不认真分析鉴别，则可能引起误诊、漏诊，甚至可能更严重的后果。现将笔者遇到的3例介绍如下，以供临床借鉴。

生态位视角下跨国企业东道国品牌族群构建及成长机制案例研究

基于品牌生态位视角,通过对大众汽车集团在华本土化经营的纵向案例研究,探索跨国企业东道国品牌族群的构建及其成长机制。研究发现,品牌生态位位移引发的企业生态响应是品牌族群发展的内在源动力;独立性与协同性相统一是构建及培育品牌族群的基本原则;品牌族群的构建及成长过程历经初创阶段、发展阶段和成熟阶段,分别聚焦于框架构建、体系完善及合力塑造;这3个阶段的成长重点从结构建设到能力培育逐渐过渡,成长目的是形成强劲持久的市场牵引力,实现企业的可持续发展。最后,基于此构建了跨国企业东道国品牌族群成长模型。

苏通长江大桥限位阻尼器的设计和测试

首先介绍了苏通长江大桥使用的特大阻尼器的设计、研究和生产制造过程,接着详细介绍了该特大阻尼器的静压测试、满冲程测试、慢速压力测试、限位装置测试、频率反应测试和抗风疫劳测试等8项测试。分析和试验都证明了苏通大桥的主桥减振限位阻尼器设计理念先进、测试和鉴定严格,阻尼器在未来的大桥性能预估中表现完好。

低音提琴的把位设置及改进设想

本文旨在研究、分析低音提琴传统把位的设置及其演进的过程,对目前使用的第五把位的定位提出质疑和移位的设想,同时还提出了“六段练习法”、“拇指对中指”等新概念。

Semi-analytical solution for mechanical analysis of tunnels crossing strike-slip fault zone considering nonuniform fault displacement and uncertain fault plane position

The tunnel subjected to strike-slip fault dislocation exhibits severe and catastrophic damage.The existing analysis models frequently assume uniform fault displacement and fixed fault plane position.In contrast,post-earthquake observations indicate that the displacement near the fault zone is typically nonuniform,and the fault plane position is uncertain.In this study,we first established a series of improved governing equations to analyze the mechanical response of tunnels under strike-slip fault dislocation.The proposed methodology incorporated key factors such as nonuniform fault displacement and uncertain fault plane position into the governing equations,thereby significantly enhancing the applicability range and accuracy of the model.In contrast to previous analytical models,the maximum computational error has decreased from 57.1%to 1.1%.Subsequently,we conducted a rigorous validation of the proposed methodology by undertaking a comparative analysis with a 3D finite element numerical model,and the results from both approaches exhibited a high degree of qualitative and quantitative agreement with a maximum error of 9.9%.Finally,the proposed methodology was utilized to perform a parametric analysis to explore the effects of various parameters,such as fault displacement,fault zone width,fault zone strength,the ratio of maximum fault displacement of the hanging wall to the footwall,and fault plane position,on the response of tunnels subjected to strike-slip fault dislocation.The findings indicate a progressive increase in the peak internal forces of the tunnel with the rise in fault displacement and fault zone strength.Conversely,an augmentation in fault zone width is found to contribute to a decrease in the peak internal forces.For example,for a fault zone width of 10 m,the peak values of bending moment,shear force,and axial force are approximately 46.9%,102.4%,and 28.7% higher,respectively,compared to those observed for a fault zone width of 50 m.Furthermore,the position of the peak internal forces is influenced by variations in the ratio of maximum fault displacement of the hanging wall to footwall and the fault plane location,while the peak values of shear force and axial force always align with the fault plane.The maximum peak internal forces are observed when the footwall exclusively bears the entirety of the fault displacement,corresponding to a ratio of 0:1.The peak values of bending moment,shear force,and axial force for the ratio of 0:1 amount to approximately 123.8%,148.6%,and 111.1% of those for the ratio of 0.5:0.5,respectively.

Shear mechanical properties and frictional sliding responses of rough joint surfaces under dynamic normal displacement conditions

A comprehensive understanding of the dynamic frictional characteristics in rock joints under high normal load and strong confinement is essential for ensuring the safety of deep engineering construction and mitigating geological disasters.This study conducted shear experiments on rough rock joints under displacement-controlled dynamic normal loads,investigating the shear behaviors of joints across varying initial normal loads,normal loading frequencies,and normal loading amplitudes.Experimental results showed that the peak/valley shear force values increased with initial normal loads and normal loading frequencies but showed an initial increase followed by a decrease with normal loading amplitudes.Dynamic normal loading can either increase or decrease shear strength,while this study demonstrates that higher frequencies lead to enhanced friction.Increased initial normal loading and normal loading frequency result in a gradual decrease in joint roughness coefficient(JRC)values of joint surfaces after shearing.Positive correlations existed between frictional energy dissipation and peak shear forces,while post-shear joint surface roughness exhibited a negative correlation with peak shear forces through linear regression analysis.This study contributes to a better understanding of the sliding responses and shear mechanical characteristics of rock joints under dynamic disturbances.

关于薄层与单界面模型弹性反射透射系数的讨论

在均匀各向同性水平层状介质假设下,采用位移与位移位两种不同的平面波表示方式,推导了层状介质的传播矩阵;并对层状模型逐步简化,依次给出了薄层、单阻抗差界面纵波入射时的反射、透射系数公式,指出了位移与位移位函数这两种不同形式下各公式的异同和适用条件,对于薄层地震反演精度的提高具有一定的指导作用。

基于压缩感知的感兴趣区域编码

受无线信道带宽的约束,图像经传统图像压缩方法压缩并经无线信道传输后,图像质量受损严重,会影响后续探测识别结果的准确性,本文针对这个问题提出一种基于压缩感知(Compressed Sensing,CS)的感兴趣区域(Region Of Interest,ROI)图像压缩方法。首先,将位平面位移技术引入压缩感知,对获得的图像进行量化、位平面分解;然后位移ROI位平面,并给出编码方案;最后,在解码端通过解码、重构,得到ROI质量良好的重构图像。仿真结果表明,本文算法重构图像的ROI部分PSNR高于传统的压缩感知编码方法,验证了方法的可行性和有效性,从而为ROI图像编码提供了一种可行的解决方案。

A Method of Measuring Large Displacement and Deformation with High Precision *

A CCD position detecting system measuring the displacement and deformation of structure is presented. The measure method takes advantage of the position detecting technique based on digital image processing. A bright spot is pegged on the object to be measured and imaged to the target of CCD camera through a telescopic lens. The CCD target converts the optical signal to equivalent electric signal. The video frequency signal is digitized to an array of 512×512 pixels by the analog to digital converter (ADC), then transmitted to the computer. The computer controls the data acquisition, conducts image processing and detects the location of the target spot. Comparing the current position with the original position of the spot, the displacement of object is obtained. With the aid of analysis software, the system can achieve the resolution of 0 01 mm in the 6 m distance from the object to the point of observation. To meet the need of practice, the measuring distance can be extended to 100 m or even farther.

Structural and Magnetic Property of Ion Irradiated TiO2 Single Crystals

Ferromagnetism is induced in pure TiO2 single crystals by oxygen ion irradiation. The ferro- magnetism is observed up to room temperature and is with weak temperature dependence. By combining X-ray diffraction, Rutherford backseattering/channelling, Raman scattering, and electron-spin resonance spectroscopy, supperconducting quantum interference device, displacement per atom, we measured tile lattice damage accumulation with increasing flu- ences. A defect complex, i.e., Ti3＋ on the substitutional accoiflpanied by oxygen vacancies, has been identified in the irradiated Ti02. This kind of defect complex results in a local （TiO6-x） stretching Raman mode. We elucidate that Ti3＋ with one unpaired 3d electron provide the local magnetic moments.

安丘方言特殊语法现象探究

安丘方言属于北方方言区胶辽官话下东潍片区的一个重要分支,包含很多具有地方色彩的语法现象。本文从安丘方言中存在的迥别于普通话的主位移位句、比较句、特殊指示代词等方面着手,以普通话的语法体系作为参照标准,对安丘方言中的特殊语法现象进行描写和分析,揭示安丘方言中特殊的语法规律和特点。

Isotope Shifts of Nitrogen around 800 nm

The Doppler-limited absorption spectra of ^14N and ^15N atoms were measured around 800 nm using concentration modulation spectroscopy to study their isotope shifts. The nitrogen atoms were generated by discharging molecular nitrogen buffered with helium in a homemade discharge tube. The isotope shifts of four multiplets （3s^4PJ→3p^4D^oJ, 3s^4PJ→3p^4P^oJ, 3s^2DJ→5s^2P^oJ, and 3p^2P^oJ→5s^2D^oJ） were measured and their J-dependent specific mass shifts were observed and discussed.

Nuclear ?eld shift effects on stable isotope fractionation: a review

An anomalous isotope effect exists in many heavy element isotope systems （e.g., Sr, Gd, Zn, U）. This effect used to be called the ＂odd--even isotope effect＂ because the odd mass number isotopes behave differently from the even mass number isotopes. This mass-indepen- dent isotope fractionation driving force, which originates from the difference in the ground-state electronic energies caused by differences in nuclear size and shape, is cur- rently denoted as the nuclear field shift effect （NFSE）. It is found that the NFSE can drive isotope fractionation of some heavy elements （e.g., Hg, T1, U） to an astonishing degree, far more than the magnitude caused by the con- ventional mass-dependent effect （MDE）. For light ele- ments, the MDE is the dominant factor in isotope fractionation, while the NFSE is neglectable. Furthermore, the MDE and the NFSE both decrease as temperatures increase, though at different rates. The MDE decreases rapidly with a factor of 1/T2, while the NFSE decreases slowly with a factor of 1/T. As a result, even at high temperatures, the NFSE is still significant for many heavy element isotope systems. In this review paper, we begin with an introduction of the basic concept of the NSFE, including its history and recent progress, and follow with the potential implications of the inclusion of the NFSE into the kinetic isotope fractionation effect （KIE） and heavy isotope geochronology.

Prediction of ground surface displacement caused by grouting

Ground surface displacement caused by grouting was calculated with stochastic medium theory. Ground surface displacement was assumed to be caused by the cavity expansion of grouting, slurry seepage, and slurry contraction. A prediction method of ground surface displacement was developed. The reliability of the presented method was validated through a comparison between theoretical results and results from engineering practice. Results show that the present method is effective. The effect of parameters on uplift displacement was illustrated under different grouting conditions. Through analysis, it can be known that the ground surface uplift is mainly caused by osmosis of slurry and the primary influence angle of stratum β determines the influence range of surface uplift. Besides, the results show that ground surface uplift displacement decreases notably with increasing depth of the grouting cavity but it increases with increasing diffusion radius of grout and increasing grouting pressure.