吸收能力、专用机制与研发边界开放度

在开放创新背景下,吸收能力、专用机制对企业研发边界开放度决策具有重要影响;本文运用资源基础、产权以及期权与交易成本理论构建了一个关于吸收能力、专用机制和相关控制变量对研发边界开放度决策影响的综合解释框架,提出了四个理论假设;根据现有文献样本,运用元分析方法,对假设进行了检验;最后,指出了进一步研究方向。

THE GENERAL SOLUTION FOR DYNAMIC RESPONSE OF NONHOMOGENEOUS BEAM WITH VARIABLECROSSSECTION

In this paper by means of the exact analytic method [1], the general solution fordynamic response of nonhomogeneous beam with variable cross section is obtained un-der arbitrary resonant load and boundary conditions. The problem is reduced to solvea non-positive differential equation. Generally, it is not solved by variational method.By the present method, the general solution for this problem may be written as an ana-lytic form. Hence, it is convenient for structure optimizing problem. In this paper, itsconvergence is proved. Numerical examples are given at the end of the paper. which in-dicates satisfactory results can be obtained.

经典解析法在地铁联络通道冻结法加固效果评价中的应用

以武汉某地铁联络通道冻结加固工程为背景,介绍了联络通道的冻结法加固设计概况,对积极冻结期间的盐水温度、冻土温度、泄压孔压力等重要数据进行了持续监测,对监测数据进行了深入分析,对数据发展规律进行了总结。通过监测数据结合理论分析,合理判定土体实际结冰温度,并在此基础上,运用几种修正的经典解析法对冻结过程中的冻结帷幕厚度、冻结壁平均温度等重要参数求解析解。实践表明,土体结冰温度的准确判断对土体冻结效果的评价具有重要意义,施工监测与理论求解的综合运用是保证联络通道施工安全的可靠手段。