校园卡管理信息系统的设计与实现

本文分析了校园卡管理信息系统的功能需求,对系统功能模块设计、数据库的设计与实现以及后台信息管理模块的设计与实现,进行了详细的介绍。     

基于改进GM(1,1)模型的Vb程序实现及其应用

针对传统GM(1,1)模型中权值的取法,提出了自动寻优定权的改进措施。本文介绍了非等时数据的等时内插理论,原灰色模型改进方法及预测精度的评定。利用Vb工具编写灰色模型自动寻优定权程序,得到最优的预测值,并通过与传统模型的预测值相比较,表明滑坡监测数据的预测预报得到了显著提高。算例结果表明利用此种预测方法是有效、可行的,更适合实际环境需要。     

从传统的VB向VB.Net迁移

Visual Basic．Net现在是真正的面向对象语言了。本文主要论述了Visual Basic．Net在面向对象支持以及面向对象的优缺点分析这2大方面进行讨论。     

Cold atoms photoassociation with intense laser pulses

We study the vibrational dynamics produced when two cold atoms are photoassociated in a diatomic molecule by an intense laser pulse (with the duration of hundreds ps), inducing a resonance condition at small interatomic distances. The example analysed is the population transfer from the continuum to the 1_g(6s + 6p_3/2) excited electronic potential of the Cs₂ molecule, at a temperature T ≈ 0.11 mK. We use a non-perturbative treatment by following the wavepackets dynamics on the ground and excited surfaces. We show that cold molecules can be efficiently produced in both ground and excited electronic potentials.     

控件在Visual Basic中的应用——编写屏幕保护程序

介绍了利用VisualBasic的控件制作屏幕保护程序的方法及屏幕保护程序在Widows下的应用,读者可以使用自己制作的屏幕保护程序使自己的Windows桌面更漂亮、更个性化。     

用VB制作网址链接器

用VB制作网址链接器，以轻松实现用鼠标单击要去的网址，就可把你带到该网站。     

Field emission from copper phthalocyanine and copper hexadecafluorophthalocyanine nanowires

Copper phthalocyanine (CuPc) and copper hexadecafluorophthalocyanine (F₁₆CuPc) nanowires were fabricated by vapor deposition. The nanowires were studied by scanning electron microscopy and transmission electron microscopy. Field emission properties of these nanowires were studied. The field emission properties were strongly dependent on the substrate temperature and the material used, and the best results are obtained for β-phase CuPc nanoribbons. Different dependences of field emission properties on the substrate temperature were obtained for the two materials investigated. The obtained results are discussed.     

Dose calculations using artificial neural networks: A feasibility study for photon beams

Direct dose calculations are a crucial requirement for Treatment Planning Systems. Some methods, such as Monte Carlo, explicitly model particle transport, others depend upon tabulated data or analytic formulae. However, their computation time is too lengthy for clinical use, or accuracy is insufficient, especially for recent techniques such as Intensity-Modulated Radiotherapy. Based on artificial neural networks (ANNs), a new solution is proposed and this work extends the properties of such an algorithm and is called NeuRad.Prior to any calculations, a first phase known as the learning process is necessary. Monte Carlo dose distributions in homogeneous media are used, and the ANN is then acquired. According to the training base, it can be used as a dose engine for either heterogeneous media or for an unknown material. In this report, two networks were created in order to compute dose distribution within a homogeneous phantom made of an unknown material and within an inhomogeneous phantom made of water and TA6V4 (titanium alloy corresponding to hip prosthesis).All NeuRad results were compared to Monte Carlo distributions. The latter required about 7 h on a dedicated cluster (10 nodes). NeuRad learning requires between 8 and 18 h (depending upon the size of the training base) on a single low-end computer. However, the results of dose computation with the ANN are available in less than 2 s, again using a low-end computer, for a 150×1×150 voxels phantom. In the case of homogeneous medium, the mean deviation in the high dose region was less than 1.7%. With a TA6V4 hip prosthesis bathed in water, the mean deviation in the high dose region was less than 4.1%.Further improvements in NeuRad will have to include full 3D calculations, inhomogeneity management and input definitions.     

Ausbau des Stichkanals nach Salzgitter von SKS‐km 3,550 bis 14,918

Expansion of the branch channel to Salzgitter from SKS‐km 3,550 to 14,918 The branch channel to Salzgitter will be extended to the waterway category Vb in the next years. This will enable inland waterway vessels with a width of 11,45 m and a loaded draft of 2,80 m to run it without limitations. The reaches Wedtlenstedt and Üfingen will be extended in most areas to a trapezoidal cross section with a width at water level of 36,90 m and a water depth of 4,00 m. The exit basins of the locks will be extended on one side. Overall about 1 000 000 m² of soil will be moved. About 300 000 m² of clay sealing and 460 000 m² of rip‐rap will be installed. Three culverts have to be replaced by new constructions to adapt to the new cross section of the channel. In addition two bridges will be modified to allow for a clearance of 5,25 m. At present the plan approval procedure is carried out. It is expected to achieve the plan approval order in 2017. The construction is planned to start in 2018. Completion is scheduled for 2024.     

Electronic structure and chemical bond in stoichiometric hydrides of the group Vb metals

The electronic structure of stoichiometric hydrides of the group Vb metals (V, Nb, Ta) has been investigated by means of the self-consistent full potential scalar-relativistic augmented plane wave method (FP-APW).

The theoretical study of the heat of solution of the ordered monohydrides VH, NbH, and TaH leads to good agreement with experimental values and allows the prediction of the preferred coordination of the hydrogen atoms in these phases, i.e. the octahedral coordination for the VH-system and the tetrahedral coordination for NbH and TaH. Analysis of the charge distribution according to the irreducible representations of the point groups yields a simple orbital picture of the bonding mechanism in the stoichiometric hydride phase. The use of an angular-dependent rather than a spherical-symmetric potential results in a distinct increase in the calculated covalent contribution to the chemical bond.