The model shows that the available permission set together with multi-permission combination operator is a hemigroup.

模型表明，有效权限集合与多重权限合并运算具有半群结构。

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An effective Hamiltonian of surface polaron interacting with the deformation potential in polar crystals was derived by using improved linear combination operator method.

本文采用改进了的线性组合算符法导出了极性半导体中与形变势相互作用的表面极化子的有效哈密顿量。

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Based on the analysis of contributing factors, a model of parameterized combination operator in air pollution forecasting is presented, which is suitable to nonlinear problems.

在成因分析的基础上，建立了大气污染物浓度预测的参数化组合算子模型，适应非线性问题。

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But UnitedHealth and Amil said they expected their combination to win approval because Amil is a managed-care firm, not primarily a hospital operator.

WSJ: UnitedHealth to Buy 90% of Brazil's Amil for $4.3 Billion