Deformation of laminated anisotropic bars in the three-dimensional statement 1. Transverse-longitudinal bending and edge compatibility condition

By using the methods of asymptotic splitting, the 3D problem on the transverse-longitudinal bending of elastic anisotropic laminated bars under the action of longitudinal and transverse loads is split into a number of plane boundary-value problems, whose solution allows one to construct asymptotic approximations for all components of the displacement vector and the strain tensor at each point in the bars. A system of ordinary differential equations of transverse-longitudinal bending is obtained for laminated bars with arbitrary anisotropy of its layers. A condition for the edge compatibility of materials in laminated orthotropic bars is deduced. Translated from Mekhanika Kompozitnykh Materialov, Vol. 45, No. 3, pp. 379-410, May-June, 2009.     

“Quantal” Behavior in Classical Probability

A number of phenomena generally believed characteristic of quantum mechanics and seen as interpretively problematic—the incompatibility and value-indeterminateness of variables, the non-existence of dispersion-free states, the failure of the standard marginal-probability formula, the failure of the distributive law of disjunction and interference—are exemplified in an emphatically non-quantal system: a deck of playing cards. Thus the appearance in quantum mechanics of incompatibility and these associated phenomena requires neither explanation nor interpretation.     

面板剪滞有效宽度的二维弹性理论解答

采用二维应力函数及板梁形变协调条件求得了板梁结构因剪力滞后引起的面板有效宽度,给出了几种典型情况的面板应力及有效宽度弹性理论精确解答的解析表达式及实用计算公式,并分析了荷载、结构型式、梁截面尺寸等对有效宽度的影响。计算结果与原型实测结果吻合良好。本文推荐的实用公式与曲线比以前用近似解答得到的有关结果更加准确合理。计算分析还得到了一个重要结论;简支梁面板纵向正应力沿截面横向变化在满跨均载作用下符合二次抛物线分布,而在跨中集中荷载下却符合三次抛物线分布,这为一些近似方法提供了抛物线次数假定的依据。     

Incentive strategies and equilibria for dynamic games with delayed information

The construction of time-lag incentive strategies for continuous time convex problems is considered. The strategies are affine in the data available and they are represented by means of Stieltjes measures. It is shown how incentive strategies can be used as equilibrium strategies in symmetric games where the decision makers are cooperative.This work was supported by the Research Council for Technology of the Academy of Finland and by the Emil Aaltonen Foundation.     

Modification of natural rubber by different grafting techniques

An attempt has been made to graft a hydrophylic monomer of N,N.dimethyl acrylamide (DMAA) onto natural rubber (NR) tube by simultaneous, per-oxidation and preirradiation grafting techniques. It was found that the grafting by simultaneous grafting technique results a maximum 29 wt% degree of grafting and by peroxidation and preirradiation techniques, results the maximum 42 wt% and 13 wt% degree of grafting, respectively. It was concluded that the peroxidation technique is the most appropriate to obtain a high degree of grafting in radiation copolymerization of DMAA onto NR.     

Preparation,characterization and compatibility studies of poly(DFAMO/AMMO)

Poly(3-difluoroaminomethyl-3-methyl oxetane (DFAMO)/3-azidomethyl-3-methyl oxetane (AMMO)) (PDA) can be used as an energetic pre-polymer in the binder systems of solid propellants and polymer-bonded explosives (PBXs). The cationic solution polymerization affords PDA using butane diol (BDO) and boron trifluride etherate (TFBE) as initiator and catalyst, separately. Its molecular structure is characterized and thermal decomposition behavior is investigated by thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). The copolymer has good thermal stability and exhibits a three-step mass-loss process with the first two steps mainly belonging to the thermal decomposition of difluoroamino and azido groups, respectively. DSC method is performed to evaluate the compatibility of PDA with some energetic components and inert materials. More than half of the selected materials are compatible with PDA, which including cyclotrimethylenetrinitramine (RDX), 2,4,6-trinitrotoluene (TNT), 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), pentaerythritol tetranitrate (PETN), ammonium perchlorate (AP), ammonium nitrate (AN), potassium nitrate (KNO₃), aluminum powder (Al), aluminum oxide (Al₂O₃), 2-nitrodiphenylamine (NDPA) and 1,3-diethyl-1,3-diphenyl urea (C₁).     

血液灌流吸附清除中分子物质的实验研究

我们从所研制的系列树脂中筛选出对中分子物质(MMS)吸附作用较好的5种吸附树脂,并将其中HP-A_3和HP-A_9用于尿毒症患者血浆体外模拟灌流和急性肾衰大鼠血液灌流。应用MMS总量测定法和Sephadex G25凝胶层析法研究树脂对MMS的吸附清除作用。结果表明,这两种树脂体内、外清除MMS作用显著,HP-A_9树脂体内清除效果更好,其血液相容性也更为理想,有希望应用于临床治疗某些MMS堆积的疾病。