A Modified Quasi-Static Method for CALM System Analysis

The quasi-static analysis method introduced by API RP 2P is well known and accepted as a very useful mooring analysis method. In the early design stage, this method is widely used for preliminary analysis and mooring parameter selection. However, the quasi-static method of API RP 2P is developed for single-floating-body condition, i. e., only one floating body is considered in the computation procedure. Difficulties arise when it is used for the analysis of a CALM system, which is comprised of two floating bodies (tanker and buoy). This paper presents an analysis procedure for a two-floating-body system based on the quasi-static procedure of API RP 2P with some modifications reflecting special characteristics of the CALM system. Finally, the analysis results of a CALM system are given to illustrate the use of this procedure.

基于QS-KMS的电力业务通信网络安全性评估方法

电力业务通信网络发生安全事件的可能性值、风险值和影响值时的误差高于0.02时,存在评估准确率低的问题。提出基于QS-KMS的电力业务通信网络安全性评估方法,在QS-KMS的基础上实现电网的安全通信。选取网络可靠性、网络抗毁性、网络适应性和网络自愈性作为电力业务通信网络安全性评估指标,结合层次分析法和熵权法计算评估指标对应的权重,通过多属性决策方法实现电力业务通信网络的安全性评估。实验结果表明,所提方法可准确地评估电力业务通信网络发生安全事件的可能性值、风险值和影响值,评估结果准确率较高。

The MFE-CFE-GFE Method for the Fully Coupled Quasi-Static Thermo-Poroelastic Problem

In this work,we consider a combined finite element method for fully coupled nonlinear thermo-poroelastic model problems.The mixed finite element(MFE)method is used for the pressure,the characteristics finite element(CFE)method is used for the temperature,and the Galerkin finite element(GFE)method is used for the elastic displacement.The semi-discrete and fully discrete finite element schemes are established and the stability of this method is presented.We derive error estimates for the pressure,temperature and displacement.Several numerical examples are presented to confirm the accuracy of the method.

非满载罐式半挂汽车列车侧倾稳定性评价改进算法

针对传统准静态(QS)方法在瞬时液体质心的求解和车辆侧倾模型两方面存在的缺陷和不足,改进了改良的方形和椭圆形横截面罐体内瞬时液体质心的求解过程,并推导了改良方形罐体内液体质心的求解公式。重新建立了车辆侧倾模型,避免了不常见和难获得车辆参数的使用,简化了侧倾极限值的求解。利用改进的QS方法通过Matlab对液体密度固定和载质量固定两种情况下的车辆侧倾极限值随充液比的变化进行了仿真。仿真结果表明:改进的QS方法可准确地预测车辆侧倾极限值。

2000年姚安M_S6.5地震震源及近邻区的低Q_S

利用震源距23km范围内观测的2000年姚安Ms6．5地震余震记录，计算了震源及近邻区域的尾波规一直达S波在频率1．5～20Hz之间的傅里叶谱振幅．结果显示谱振幅随震源距增大而增大，在对谱振幅进行了震源辐射方向性校正之后，才出现谱振幅随震源距衰减的现象．由此获得了震源及近邻区域S波的Qs（f）值，可表示为Qs（f）=8．9^0.98．其值比由尾波得出的姚安地区的平均Qc（f）值低得多，表明了震源破裂带的强烈非均匀性对Qs（f）的重大影响．

Optimizing the Qusai-static Folding and Deploying of Thin-Walled Tube Flexure Hinges with Double Slots

The thin-walled tube flexure（TWTF） hinges have important potential application value in the deployment mechanisms of satellite and solar array, but the optimal design of the TWTF hinges haven＇t been completely solved, which restricts their applications. An optimal design method for the qusai-static folding and deploying of TWTF hinges with double slots is presented based on the response surface theory. Firstly, the full factorial method is employed to design of the experiments. Then, the finite element models of the TWTF hinges with double slots are constructed to simulate the qusai-static folding and deploying non-linear analysis. What＇s more, the mathematical model of the TWTF flexure hinge quasi-static folding and deploying properties are derived by the response surface method. Considering of small mass and high stability, the peak moment of quasi-static folding and deploying as well as the lightless are set as the objectives to get the optimal performances. The relative errors of the objectives between the optimal design results and the FE analysis results are less than 7%, which demonstrates the precision of the surrogate models. Lastly, the parameter study shows that both the slots length and the slots width both have significant effects to the peak moment of quasi-static folding and deploying of TWTF hinges with double slots. However, the maximum Mises stress of quasi-static folding is more sensitive to the slots length than the slots width. The proposed research can be applied to optimize other thin-walled flexure hinges under quasi-static folding and deploying, which is of great importance to design of flexure hinges with high stability and low stress.

On the transient models of the VITAS code:applications to the C5G7-TD pin-resolved benchmark problem

This article describes the transient models of the neutronics code VITAS that are used for solving time-dependent,pinresolved neutron transport equations.VITAS uses the stiffness confinement method(SCM)for temporal discretization to transform the transient equation into the corresponding transient eigenvalue problem(TEVP).To solve the pin-resolved TEVP,VITAS uses a heterogeneous variational nodal method(VNM).The spatial flux is approximated at each Cartesian node using finite elements in the x-y plane and orthogonal polynomials along the z-axis.Angular discretization utilizes the even-parity integral approach at the nodes and spherical harmonic expansions at the interfaces.To further lower the computational cost,a predictor–corrector quasi-static SCM(PCQ-SCM)was developed.Within the VNM framework,computational models for the adjoint neutron flux and kinetic parameters are presented.The direct-SCM and PCQ-SCM were implemented in VITAS and verified using the two-dimensional(2D)and three-dimensional(3D)exercises on the OECD/NEA C5G7-TD benchmark.In the 2D and 3D problems,the discrepancy between the direct-SCM solver’s results and those reported by MPACT and PANDAS-MOC was under 0.97%and 1.57%,respectively.In addition,numerical studies comparing the PCQ-SCM solver to the direct-SCM solver demonstrated that the PCQ-SCM enabled substantially larger time steps,thereby reducing the computational cost 100-fold,without compromising numerical accuracy.

BUBBLE POINT PRESSURE MEASUREMENT FOR ISOTHERMAL QUATERNARY SYSTEM AND PREDICTION OF VAPOR-LIQUID EQUILIBRIUM

1 INTRODUCTIONVapor-liquid equilibrium(VLE)relations are required for practical use,such as in the designand operation of disitillation equipment.In the conventional experimental methods of vapor-liquid equilibria,some analytical instruments are applied.They are time-consuming and dif-ficult for multicomponent system because the proper method for the composition analysis isnot easy to be set up.

Measurement of Isoplethic Vapor-Liquid Equilibrium Data by Using Inclined Ebulliometer

Isoplethic VLE data for the systems benzene-hexane at 9 different compositions in the temperature range from 298 K to 331K, chloroform-benzene at 11 different compositions in the temperature range from 308 K to 350 K and chloroform-hexane at 9 different compositions in the temperature range from 311 K to 337 K were determined by using an inclined ebulliometer with a pump-like stirrer. Isothermal and isobaric VLE were calculated from the isoplethic results with a extended UNIQUAC equation and these data agree well with the literature data.

Bending of simply supported incompressible saturated poroelastic beams with axial diffusion

Based on the mathematical model of the bending of the incompressible saturated poroelastic beam with axial diffusion, the qUasi-static bendings of the simply supported poroelastic beam subjected to a suddenly applied constant load were investigated, and the analytical solutions were obtained for different diffusion conditions of the pore fluid at the beam ends. The deflections, the bending moments of the solid skeleton and the equivalent couples of the pore pressures were presented in figures. It is also shown that the behavior of the saturated poroelastic beams depends closely on the diffusion conditions at the beam ends, especially for the equivalent couples of the pore pressures. It is found that the Mandel-Cryer effect also exists in the bending of the saturated poroelastic beams under specific diffusion conditions at the beam ends.

电针配合耳穴贴压治疗胸腰段带状疱疹后遗神经痛的疗效观察

目的:观察电针配合耳穴贴压治疗带状疱疹后遗神经痛的临床疗效。方法:将110例胸腰段带状疱疹后遗神经痛的患者随机分成治疗组(电针配合耳穴贴压)和对照组(药物),观察两组治疗后的临床疗效及VAS、QS评分的变化。结果:治疗组和对照组的总有效率分别为90.91%和76.36%,两组比较有显著性差异(P<0.05)。治疗前两组患者VAS及QS评分差异无统计学意义(P>0.05)。治疗后两组患者的VAS评分均较治疗前下降(P<0.05),而治疗组降低较对照组明显(P<0.05)。治疗后两组患者的QS评分均较治疗前升高(P<0.05),而治疗组升高较对照组明显(P<0.05)。结论:表明采用电针配合耳穴贴压治疗带状疱疹后遗神经痛具有确切的疗效,能明显缓解患者的疼痛,改善患者的睡眠质量,值得临床推广。

不同楸树品种对茎腐病的抗性差异研究

【目的】探究不同品种和不同繁殖方式楸树(Catalpa bungei)苗对烟草疫霉(Phytophthora nicotianae)(菌株QS.1)侵染的抗性差异,为楸树引种栽培、抗病育种提供依据。【方法】以‘洛楸1号’组培苗(LQ-Z)、‘金丝楸’(JSQ)、‘楸杂1号’(QZ)、‘豫楸1号’(YQ)的1年生组培苗,以及‘洛楸1号’扦插苗(LQ-Q)、‘楸树5-8’(Q5-8)、‘楸树8-1’(Q8-1)的1年生扦插苗,6个生产上推广的楸树品种为试验材料,用烟草疫霉(菌株QS.1)进行侵染,测定楸树相关渗透物质含量、保护酶活性和光合气体参数等变化,分析不同处理楸树幼苗感染烟草疫霉(菌株QS.1)后的生理指标变化。【结果】菌株QS.1侵染后2~4 d,供试的各楸树品种均感病。楸树品种组培苗中,‘楸杂1号’和‘豫楸1号’对菌株QS.1侵染的抗性最弱,‘金丝楸’的抗病力最强;楸树品种扦插苗中,‘楸树5-8’和‘楸树8-1’对菌株QS.1侵染抗性较强;‘洛楸1号’扦插苗抗病性大于组培苗,除‘金丝楸’外,楸树品种的扦插苗较组培苗具有更高的抗性。【结论】不同楸树品种在接菌后感染致病存在差异,不同楸树品种的抗烟草疫霉(菌株QS.1)致病能力与光合性能的维持及防御相关酶活性的调节有关。

基于遗传算法的液罐车侧倾稳定性模型

为了研究液罐车罐体几何尺寸对整车侧倾稳定性的影响,基于准静态方法建立了椭圆形截面罐体内液体晃动的质心运动和整车倾覆力矩求解方程,并推导出液罐车侧倾响应动力学方程,将2种方程进行联合仿真,得到液罐车侧倾响应动力学模型。以不同充液比的液体质心高度和整车倾覆力矩为优化目的,运用改进型遗传算法对液罐车罐体进行优化。结果表明:椭圆形液罐车的侧倾稳定性较圆形截面更好;椭圆形截面液罐车罐体的最优几何尺寸为长轴1.64m,短轴1.2m;最优椭圆截面尺寸液罐车的侧倾稳定性较其他尺寸液罐车有所提高。

混沌序列在准同步码分多址系统中的应用

为了获取适用于准同步码分多址系统的混沌序列 ,提出一种用于准正交序列性能分析的优选准则 ,并通过系统仿真对优选混沌序列进行了验证。在准同步码分多址系统中 ,影响系统性能的是零时延附近的部分扩频序列相关函数 ,而且奇相关函数和偶相关函数发挥同等重要的作用。据此对初值不同的 L ogistic映射序列进行筛选 ,得到了混沌准正交序列组。采用 Monte Carlo的方法 ,在 AWGN信道下对采用混沌优选序列的准同步码分多址系统进行了仿真。结果表明 :优选的混沌序列具有优秀的准正交性 。