W eighted sum based method on the optimal weights for weapon evaluation

In order to solve instability problem of calculation precision resulting from the selection of each target weight in evaluating weapon systems, a weighted sum based method is proposed. Specif- ically, the subjective weights depending on experts＇ experience are substituted by the optimal weights. The optimal weights are acquired through constructing a mathematical programming model based on subjective weights and objective weights. The method of solving subjective weights is the same as before, and the objective weights were solved by means of grey theory. The case analysis shows that the method of improved weighted sum can improve the evaluation precision up to more than 5% , and minimize the instability of calculation precision resulting from only using subjective weights. The method that the optimal weights substituted the subjective weights is brought forward in improving evaluation precision for the first time. The ideas of the optimal weights and the pro- posed method are described and analyzed.

Research on the effect estimation of seismic safety evaluation

Seismic safety evaluation is a basic work for determining the seismic resistance requirements of major construc-tion projects. The effect, especially the economic effect of the seismic safety evaluation has been generally con-cerned. The paper gives a model for estimating the effect of seismic safety evaluation and calculates roughly the economic effect of seismic safety evaluation with some examples.

Applications of the first integral method to nonlinear evolution equations

In this paper, we establish travelling wave solutions for some nonlinear evolution equations. The first integral method is used to construct the travelling wave solutions of the modified Benjamin-Bona-Mahony and the coupled Klein-Gordon equations. The obtained results include periodic and solitary wave solutions. The first integral method presents a wider applicability to handling nonlinear wave equations.

A novel simulation method for positive corona current pulses

A novel two-dimensional （2D） simulation method of positive corona current pulses is proposed. A control-volume- based finite element method （CV-FEM） is used to solve continuity equations, and the Galerkin finite element method （FEM） is used to solve Poisson＇s equation. In the proposed method, photoionization is considered by adopting an exact Helmholtz photoionization model. Furthermore, fully implicit discretization and variable time step are used to ensure the time-efficiency of the present method. Finally, the method is applied to a positive rod-plane corona problem. The numerical results are in agreement with the experimental results, and the validity of the proposed method is verified.

Exact solutions of nonlinear fractional differential equations by (G'/G)-expansion method

In this paper, we use the fractional complex transform and the （G＇/G）-expansion method to study the nonlinear fractional differential equations and find the exact solutions. The fractional complex transform is proposed to convert a partial fractional differential equation with Jumarie＇s modified Riemann-Liouville derivative into its ordinary differential equation. It is shown that the considered transform and method are very efficient and powerful in solving wide classes of nonlinear fractional order equations.

Compact implicit integration factor methods for some complex-valued nonlinear equations

The compact implicit integration factor （cIIF） method is an efficient time discretization scheme for stiff nonlinear diffusion equations in two and three spatial dimensions. In the current work, we apply the cIIF method to some complex-valued nonlinear evolutionary equations such as the nonlinear SchrSdinger （NLS） equation and the complex Ginzburg-Landau （GL） equation. Detailed algorithm formulation and practical implementation of cIIF method are performed. The numerical results indicate that this method is very accurate and efficient.

Interval finite difference method for steady-state temperature field prediction with interval parameters

A new numerical technique named interval finite difference method is proposed for the steady-state temperature field prediction with uncertainties in both physical parameters and boundary conditions. Interval variables are used to quantitatively describe the uncertain parameters with limited information. Based on different Taylor and Neumann series, two kinds of parameter perturbation methods are presented to approximately yield the ranges of the uncertain temperature field. By comparing the results with traditional Monte Carlo simulation, a numerical example is given to demonstrate the feasibility and effectiveness of the proposed method for solving steady-state heat conduction problem with uncertain-but-bounded parameters.

Public Transit Performance Evaluation Using Data Envelopment Analysis and Possibilities of Enhancement

This study evaluates the operational performance of all routes of Sajha Bus Yatayat operating inside Kathmandu valley using Data Envelopment Analysis (DEA) in terms of efficiency and effectiveness score. This approach allows us to access the relative performance of transit system in absence of historical data and research to compare with. To explore the possibility of enhancing the performance, scenarios were created for relatively underperforming routes and long route problem by changing the most important input variable and output variables accordingly with regression model where it was relevant. Partial Least Squares (PLS) regression was used to determine the most influential input variables to the output variables. DEA was conducted to access the performance of all routes under these scenarios. Underperforming routes except the longest route under the first set of scenarios, emerge to be better performing efficiently without considerable negative deviation in effectiveness. The result of second set of scenarios for long route problem suggests that the longest route’s performance can be enhanced significantly upon proper route alignment. Scenarios development and evaluation can help lead transit companies to explore the strategies to facilitate operational performance enhancement.

Calculation methods of lubricant film pressure distribution of radial grooved thrust bearings

In order to calculate the pressure distribution of radial grooved thrust bearing, analytical and numerical methods were applied respectively. Grooved region and land region were linked by u- sing the mass conservations principle at the groove/land boundary in each method. The block-weight approach was implemented to deal with the non-coincidence of mesh and radial groove pattern in nu- merical method. It was observed that the numerical solutions had higher precision as mesh number exceed 70 x 70, and the relaxation iteration of differential scheme presented the fastest convergence speed when relaxation factor was close to 1.94.

A GENERALIZED GAUSS-TYPE QUADRATURE FORMULA AND ITS APPLICATIONS TO PSEUDOSPECTRAL METHOD

A generalized Gauss-type quadrature formula is introduced, which assists in selection of collocation points in pseudospectral method for differential equations with two-point derivative boundary conditions. Some results on the related Jacobi interpolation are established. A pseudospectral scheme is proposed for the Kuramoto-Sivashisky equation. A skew symmetric decomposition is used for dealing with the nonlinear convection term. The stability and convergence of the proposed scheme are proved. The error estimates are obtained. Numerical results show the efficiency of this approach.

Variational iteration method for solving compressible Euler equations

This paper applies the variational iteration method to obtain approximate analytic solutions of compressible Euler equations in gas dynamics. This method is based on the use of Lagrange multiplier for identification of optimal values of parameters in a functional. Using this method, a rapid convergent sequence is produced which converges to the exact solutions of the problem. Numerical results and comparison with other two numerical solutions verify that this method is very convenient and efficient.

Investigation of third-grade non-Newtonian blood flow in arteries under periodic body acceleration using multi-step differential transformation method

In this paper, a non-Newtonian third-grade blood in coronary and femoral arteries is simulated analytically and numerically. The blood is considered as the third- grade non-Newtonian fluid under the periodic body acceleration motion and the pulsatile pressure gradient. The hybrid multi-step differential transformation method （Hybrid-Ms- DTM） and the Crank-Nicholson method （CNM） are used to solve the partial differential equation （PDE）, and a good agreement between them is observed in the results. The effects of the some physical parameters such as the amplitude, the lead angle, and the body acceleration frequency on the velocity and shear stress profiles are considered. The results show that increasing the amplitude, Ag, and reducing the lead angle of body acceleration, 9, make higher velocity profiles on the center line of both arteries. Also, the maximum wall shear stress increases when Ag increases.

High order multiplication perturbation method for singular perturbation problems

This paper presents a high order multiplication perturbation method for sin- gularly perturbed two-point boundary value problems with the boundary layer at one end. By the theory of singular perturbations, the singularly perturbed two-point boundary value problems are first transformed into the singularly perturbed initial value problems. With the variable coefficient dimensional expanding, the non-homogeneous ordinary dif- ferential equations （ODEs） are transformed into the homogeneous ODEs, which are then solved by the high order multiplication perturbation method. Some linear and nonlinear numerical examples show that the proposed method has high precision.

职业本科教育教学评估的四个基本问题

职业本科是本科教育的新型载体,教学评估是强化内涵的必要手段。面对职业本科教育评估研究不足、评估方案缺位状况,梳理职业本科教育的发展过程,把握稳步发展的核心要义,分析职业本科教育与应用本科教育“同类异型”关系,明确工匠精神的引领性、本科教育的层次性、价值取向的兼容性等类型特征,构建聚焦“学校特色、学科特点、学者特质、学生特长”的评估体系,才能促进职业本科教育稳步发展、健康发展、优质发展。

Optimization of multibody systems based on the generalized-α projection method for DAEs

Efficient optimization strategy of multibody systems is developed in this paper. Aug- mented Lagrange method is used to transform constrained optimal problem into unconstrained form firstly. Then methods based on second order sensitivity are used to solve the unconstrained problem, where the sensitivity is solved by hybrid method. Generalized-α method and generalized-α projection method for the differential-algebraic equation, which shows more efficient properties with the lager time step, are presented to get state variables and adjoint variables during the optimization procedure. Numerical results validate the accuracy and efficiency of the methods is presented.

高职院校科研平台服务地方效能评价体系建设研究

科教融汇新战略要求高职院校必须高度重视科研平台建设实效。面对高职院校科研平台建设层次低、体量小,重数量、轻成效,重管理、轻评价的现实问题,选择科研平台服务地方发展效能研究评价标准,有助于明确科研平台发展方向,增强发展动力,拓展发展空间。以破除“五唯”分类评价,定性定量综合考量,科学容错理性评价为原则,从平台效能目标推导评价指标体系,多元化选定评价主体,从目标设定、机构运行、有效投入、创新产出、收益影响等维度分类设计评价指标和测评点,创新性构建了高职院校科研平台服务地方效能评价体系。

时频电磁技术在黄土塬覆盖区河道砂油藏分布预测中的应用

鄂尔多斯盆地西部黄土塬覆盖区的中生界侏罗系油藏成藏主控因素复杂,在未开展三维地震勘探的区域,仅利用二维地震资料进行钻探的成功率较低。为了提高钻井成功率,针对该区侏罗系河道砂油藏特点,采用时频电磁双侧、双源激发、多线接收的油气检测技术方案。在鄂尔多斯盆地西部ZB地区进行攻关试验,总结了适用于黄土塬覆盖区的时频电磁采集、处理、解释技术方案,即两项针对性采集方案设计和三项针对性处理、解释技术。利用GeoEast软件系统,基于深度学习开展时频电磁多参数智能油气预测。根据时频电磁解释成果,在时频电磁强异常区域部署并完钻Z6井,获得工业油气流,表明时频电磁预测结果与实钻结果吻合,证实了在黄土塬覆盖区利用时频电磁技术对侏罗系薄储层进行油气预测的可靠性。

基于模糊综合评价方法对枳椇果柄可食性的选优

于2019年起,在走访调查的基础上,对福建省闽西北3市13县的35株适口性较好的枳椇的成熟果柄,通过检测色泽、甜味、单果重和感官评价质感、涩味、风味等共6个指标,建立模糊综合评价体系,对35株枳椇果柄的可食性进行综合评价。研究结果表明,所建立的模糊综合评价方法评价枳椇果柄的选优技术确实可行;通过综合评价优选出:SW2、JO9、JN17、JL25、JL26、WY30为优株,SW1、SW3、SC7、JL27为较优良株,可作为优树母树加以保护,并通过无性繁殖方法加以扩繁,为进一步研究提供基础。

多模式融合教学法在骨科临床教学中的实施效果

目的探讨多模式融合教学法在骨科临床教学中的实施效果。方法选取2020年1月—2023年1月广西医科大学第一附属医院骨科参与临床教学的85名学员为研究对象,根据不同教学法将入选者进行分组,对照组42名学员接受传统教学法,研究组43名学员多模式融合教学法,比较两组的考核成绩、自主学习能力与自我效能、教学认可度、教学满意度。结果教学前,两组学员理论知识、病例分析、诊疗技能考核成绩比较,差异无统计学意义(P均>0.05)。教学后,研究组理论知识、病例分析、诊疗技能考核成绩评分别为(36.41±2.67)分、(26.17±2.15)分、(25.53±3.02)分,高于对照组的(34.76±2.52)分、(23.13±1.62)分、(23.45±2.37)分,差异有统计学意义(P均<0.05)。教学前,两组学员自主学习能力与自我效能评分比较,差异无统计学意义(P均>0.05)。教学后,研究组各项评分均高于对照组,差异有统计学意义(P<0.05)。教学后,研究组学员对各项教学指标的认可度、对教学模式各条目的满意度分均较对照组高,差异有统计学意义(P均<0.05)。结论多模式融合教学法有助于提升学员考核成绩,在骨科临床教学中效果显著,学员满意度高。

曹娥江适宜生态流量计算和评价研究

保障河流生态流量对维持河流生态健康状态具有重要意义。通过对曹娥江流域东沙埠和黄泥桥两个控制断面1961—2017年还原径流量资料进行可靠性、代表性和一致性检验,表明还原径流量可视为天然径流量。选取Tennant法、Qp法、频率曲线法、年内展布法、月流量变动法共5种水文学方法分别计算两个控制断面各月适宜生态流量。以准确率、满足率和适宜度为指标综合评价了不同方法在曹娥江流域研究区的适用性,最终推荐月流量变动法作为适宜生态流量的计算方法,最小值分别为14.83 m^(3)/s和2.44 m^(3)/s,最大值分别为46.61 m^(3)/s和6.74 m^(3)/s。该研究为流域水库生态调度提供参考。