Configuration evolution of Al_n(n=3,4,6,13,19) clusters studied using linear synchronous transit method

The evolution of configurations of Aln (n=3,4,6,13,19) clusters were investigated using linear synchronous transit (LST) method. The stable structures of Al3, Al4, Al6, Al13, Al19 clusters were confirmed to be triangle, rhombus, octahedron, icosahedron and double icosahedron, respectively. For Al6 and Al19 clusters there are metastable structures of parallelogram and octahedron, respectively, whereas in the Al3, Al4 and Al13 clusters, no metastable configuration are validated. A large energy gap and a low energy barrier between the parallelogram and the octahedron of the Al6 cluster indicate the transformation from its metastable configuration to stable octahedron to be rather easy. By contrast, a small energy gap and a high energy barrier between the stable and metastable structures of Al19 cluster mean its configuration evolution from the octahedron to the double icosahedron occurs hardly, therefore the metastable octahedron configuration of Al19 cluster can be extensively detected in experiments and simulations.

KINETO-ELASTODYNAMIC ANALYSIS USED BY THE MATRIX-TRANSIT METHOD

An element based on the harmonic functions for Performing vibration analysis oflinkages was developed to propose the matrix-transit equations and the kineto-elastrodynamics(KED) different equations. Method and the KED equations was continllous undertaken by themodal superposition approach. The results from those equations include the quasistatic parts andthe dynamic parts. The dynamic parts equaled to the developing parts of the computationaccurations.

A transition method based on Bezier curve for trajectory planning in cartesian space

In order to smooth the trajectory of a robot and reduce dwell time,a transition curve is introduced between two adjacent curves in three-dimensional space.G2 continuity is guaranteed to transit smoothly.To minimize the amount of calculation,cubic and quartic Bezier curves are both analyzed.Furthermore,the contour curve is characterized by a transition parameter which defines the distance to the corner of the deviation.How to define the transition points for different curves is presented.A general move command interface is defined for receiving the curve limitations and transition parameters.Then,how to calculate the control points of the cubic and quartic Bezier curves is analyzed and given.Different situations are discussed separately,including transition between two lines,transition between a line and a circle,and transition between two circles.Finally,the experiments are carried out on a six degree of freedom(DOF) industrial robot to validate the proposed method.Results of single transition and multiple transitions are presented.The trajectories in the joint space are also analyzed.The results indicate that the method achieves G2 continuity within the transition constraint and has good efficiency and adaptability.

Transition probabilities for NII 2p4f-2p3d and 2s2p^23d-2s2p^23p obtained by a semiclassical method

Based on NII spectra, some transition probabilities for 2p4f-2p3d and 2s2p23d-2s2p23p are obtained by a semi- classical method. The results are in good agreement with other measurements and the data reported by the National Institute of Standards and Technology. The transition probability for a line of 424.18nm is reported for the first time. Meanwhile, a feasible method of calculating transition parameters related to special excited configurations or highly excited states is provided.

Size transition of spiral waves using the pulse array method

The domain size of spiral waves is an important issue in studies of two-dimensional （2D） spatiotemporal patterns. In this work, we use the 2D complex Ginzburg-Landau equation （CGLE） as our model and find that an initially big spiral can successfully transfer to several small spirals by applying a pulse array method. The impacts of several important factors, such as array density, controlling intensity and pulsing time, are investigated. This control approach may be useful for the control of 2D spatiotemporal patterns and has potential applications in the control of some realistic systems, such as meteorological and cardiac systems.

Biasing transition rate method based on direct MC simulation for probabilistic safety assessment

Direct Monte Carlo(MC) simulation is a powerful probabilistic safety assessment method for accounting dynamics of the system.But it is not efficient at simulating rare events.A biasing transition rate method based on direct MC simulation is proposed to solve the problem in this paper.This method biases transition rates of the components by adding virtual components to them in series to increase the occurrence probability of the rare event,hence the decrease in the variance of MC estimator.Several cases are used to benchmark this method.The results show that the method is effective at modeling system failure and is more efficient at collecting evidence of rare events than the direct MC simulation.The performance is greatly improved by the biasing transition rate method.

Comparison of methods to transition geodetic latitude

With the wide application of GPS technology, the application of the system of space rectangular coordinates is more and more extensive. Transformation of space rectangular coordinates into geodetic coordinates becomes a very popular problem. In order to evaluate various kinds of algorithms existing for solving the problem, three evaluation criteria of the algorithm were put forward at first, that is, precision, calculation speed and algorithm regional suitability. After given some basic formula, three kinds of representative algorithms, classics iteration algorithm, ellipsoidal parameter transformation algorithm and rational polynomials approximation algorithm were introduced. Through a test program made by MATLAB, these three kinds of algorithms were compared. Some helpful conclusions were drawn.

The Research of Urban Rail Transit Sectional Passenger Flow Prediction Method

This paper studies the short-term prediction methods of sectional passenger flow, and selects BP neural network combined with the characteristics of sectional passenger flow itself. With a case study, we design three different schemes. We use Matlab to realize the prediction of the sectional passenger flow of the Beijing subway Line 2 and make comparative analysis. The empirical research shows that combining data characteristics of sectional passenger flow with the BP neural network have good prediction accuracy.

Numerical Verification of Transition’s Energies of Excitons in Quantum Well of ZnO with the Finite Difference Method

This paper shows that the experimental results of quantum well energy transitions can be found numerically. The cases of several ZnO-ZnMgO wells are considered and their excitonic transition energies were calculated using the finite difference method. In that way, the one-dimensional Schrödinger equation has been solved by using the BLAS and LAPACK libraries. The numerical results are in good agreement with the experimental ones.

冠心病PCI术后Triangle分层分级延续护理方案的构建

目的:构建冠心病经皮冠状动脉介入治疗(PCI)术后出院病人Triangle分层分级延续护理方案,优化医疗资源配置,提升延续护理效果。方法:基于Triangle分层分级模式理论,结合临床经验,经内容分析法、小组讨论及德尔菲法,构建冠心病PCI术后Triangle分层分级延续护理方案。结果:2轮函询专家积极系数分别为88.24%、100.00%,权威系数分别为0.89,0.92,协调系数分别为0.401,0.504(均P<0.05)。冠心病PCI术后Triangle分层分级延续护理方案包括分层及分级两部分,分层部分含3个一级指标、21个二级指标;分级部分包含3个一级指标、42个二级指标及三级指标。结论:构建的冠心病PCI术后Triangle分层分级延续护理方案具有科学性及可靠性,为出院冠心病PCI术后病人的有效管理与护理服务提供参考。

Sinc配点法与sinh变换求解奇异摄动过渡层问题

针对一类奇异摄动过渡层问题,采用具有高精度的Sinc配点法进行离散求解。利用双指数变换,将自然定义在无界区域上的Sinc配点法推广到求解带有齐次Dirichlet边界条件的两点边值问题。对于非齐次Dirichlet边值问题,设计线性函数对未知函数进行改造,将原问题转化为齐次Dirichlet边值问题。对于过渡层的处理,利用sinh变换将Sinc节点在奇性处进行加密,实现较少的节点即可达到较高的精度。基于双指数变换,提出了有界区域上重心形式的Sinc插值公式来改善非插值节点上的近似效果。数值实验验证了结合双指数变换和sinh变换的Sinc配点法在求解过渡层问题、具有激波的非定常Burgers’方程上的高效性。

基于健康赋权的脑卒中吞咽障碍患者过渡期护理方案的构建

目的构建基于健康赋权的脑卒中吞咽障碍患者过渡期护理方案,为脑卒中患者的过渡期护理提供参考。方法以健康赋权为理论框架,通过文献分析法和半结构式访谈法构建脑卒中吞咽障碍患者过渡期护理方案初稿。运用德尔菲专家函询法完善并确立最终方案。结果本研究共纳入15名函询专家,2轮函询问卷有效回收率分别为86.67%、100%,专家权威系数分别为0.906、0.910,肯德尔和谐系数分别为0.235、0.320,最终构建的脑卒中吞咽障碍患者过渡期护理方案包括5个一级指标,11个二级指标和24个三级指标。结论以健康赋权为理论基础构建的脑卒中吞咽障碍患者过渡期护理方案具有科学性和可靠性,内容全面且有较好的临床实用性。

基于转型冲击理论的手术室新护士培训方案的构建

目的基于转型冲击理论构建手术室新护士的培训方案。方法在文献分析、半结构式访谈的基础上初拟手术室新护士培训方案。2024年2—4月对北京、广州、武汉和湖南等国内8个省份、16个市区的23名手术室临床管理、教学专家进行2轮德尔菲专家函询,制定针对手术室新护士转型冲击的培训方案。结果2轮函询问卷的有效回收率分别为92%、100%、专家权威系数皆为0.89、肯德尔协调系数分别为0.731、0.834(P<0.05)。最终形成的手术室新护士培训方案包含知识与技能、责任、角色及关系4个一级指标、8个二级指标及46个三级指标。结论基于转型冲击理论构建的手术室新护士培训方案科学性显著、培训内容具有手术室专科特色、培训方式和考核形式具有多样化,能够满足手术室新护士的培训需要。

Effects of T-S wave amplitude on the control of boundary layer transition by streaks

The effects of streaks on boundary layer transition depend on the initial amplitude of T-S waves introduced to excite the transition. This problem was studied in a flat-plate boundary layer in water tunnel by using hydrogen bubble method. Three T-S wave initial amplitudes were tested. The results show that both narrow and wide-spacing streaks depress the transition excited by T-S waves with lower initial amplitude. However, when transition is excited by T-S waves of higher initial amplitude, the narrow-spacing streaks depress the transition, while the wide-spacing streaks promote the transition. Futrther the underlying mechanisms were also analyzed.

Finite element analysis of elasto-plastic plate bending problems using transition rectangular plate elements

In this work, the finite element analysis of the elasto-plastic plate bending problems is carried out using transition rectangular plate elements. The shape functions of the transition plate elements are derived based on a practical rule. The transition plate elements are all quadrilateral and can be used to obtain efficient finite element models using minimum number of elements. The mesh convergence rates of the models including the transition elements are compared with the regular element models. To verify the developed elements, simple tests are demonstrated and various elasto-plastic problems are solved. Their results are compared with ANSYS results.

Magnetic transition of ferromagnetic material at high pressure using a novel system

A system for the investigation of the magnetic properties of materials under high pressure is fabricated based on diamond anvil cell （DAC） technology. The system is designed with an improved coil arranged around the diamond of a non-magnetic DAC. Using this system, the magnetic transition of ferromagnetic （Fe） sample under increasing pressure can be observed. We successfully obtain the evolution of magnetic properties as a function of applied pressure reaching 26.9 GPa in the Fe sample. A magnetic transition is observed at approximately 13 GPa, which is consistent with the theoretical prediction.

Extension of e^N method to general three-dimensional boundary layers

In order to extend the eN method to general three-dimensional boundary layers, the conservation law of the imaginary parts for the wave parameters with a fixed wave vector is deduced. The compatibility relationship （CR） and the general theory of ray tracing （RT）, which have been extensively used in conservative systems, are applied to a general three-dimensional boundary layer belonging to non-conservative systems. Two kinds of eN methods, i.e., the eN-CR method and the eN-RT method, are established. Both the two kinds of methods can wavenumber and the amplitude of the be used to predict the evolutions of the spanwise disturbances in general three-dimensional boundary layers. The reliability of the proposed methods is verified and validated by performing a direct numerical simulation （DNS） in a hypersonic general three-dimensional boundary layer over an aircraft model. The results are also compared with those obtained by other eN methods, indicating that the proposed methods have great potential applications in improving the transition prediction accuracy in general three-dimensional boundary layers.

TDDFT Studies of Electronic Structure and First Hyperpolarizability of Tetra-nuclear Cubane-like Transition Metal Clusters

The TDDFT method is first applied in a series of tetra-nuclear transition metal clusters studies for nonlinear optical properties. The results indicate that the charge transfer inside the metal core [MCu3X4] (M=W, Mo; X=S, O, Cl, Se, Br) makes contribution to the optical nonlinearity. It is possible to enhance the hyperpolarizability by substituting the ligands of the clusters.

Intercombination transitions of the carbon-like isoelectronic sequence

Energy levels, wavelengths, transition rates, oscillator strengths, and lifetimes between the 2s22p23P1,2s22p23P2,and 2s2p35S2 levels of ions in the carbon-like （C-like） isoelectronic sequence （nuclear charges Z=7-92） are calculated in the valence and core-valence limits using the multiconfiguration Dirac–Fock method. The Breit interaction, quantum electrodynamics （QED）, and finite nuclear mass effects are taken into account in subsequent relativistic configuration-interaction calculations. The calculated energies and transition rates are compared with the critically evaluated experimental values and other recent calculated results. Our calculated data are in good agreement with these data.