first approach section 中文意思是什麼
first approach section
解釋
第一接近區段-
Al. first applies the color - dipole approach to drell - yan process, which says that in the target rest frame the drell - yan process can be viewed as bremsstrahlung. rather than parton annihilation. according to factorization theorem, the drell - yan cross section can be expressed in terms of the same dipole cross section that appears in deep inelastic scattering
雖然高能反應的微分截面是洛侖茲不變的，但其部分子解釋卻是與坐標系有關的，最近， b . z . kopeliovich等提出靶靜止系中drell - yan過程的色偶極模型，他們認為，在靶靜止系高能碰撞的drell - yan過程是一韌致輻射過程而不是正反夸克對的湮滅。 -
In order to achieve the optimized tunneling approach, first, tunneling procedures, shift length, horizontal jet grouting length, bench length and space length between c and d part of crd method are optimized ; on the basis of these results, two kinds of tunneling schemes are calculated with three - dimensional fem and the optimized tunneling scheme is achieved. as results of the optimized scheme, the conclusion is made that the gas pipe above the tunnel of sk3 + 355 section is secure. the calculation results are verified through comparison of numerical simulation results and site - monitoring measurement data
為得出適合本段工程的最佳施工路線，利用大型有限元通用軟體ansys對開挖順序、開挖進尺、水平旋噴長度、臺階長度及crd工法施工的c 、 d部相錯長度進行了有限元數值模擬和優化分析，並利用這些分析結果，進行了兩個施工方案的三維有限元動態施工模擬，得出了較優的施工方案，並利用施工后的地表沉降槽曲線，對sk3 + 355斷面處隧道上方的煤氣管線的安全性進行了分析，得出了利用此施工方案施工不會造成此處煤氣管線破壞的結論。 -
First of all, both r & d labor and r & d capital input variables are introduced into the input vector, and a two - level ces production function model is constructed to describe the technology of production. then the firm - level cross - section data of shanghai ’ s main manufacturing industries in 2003 is employed to study the input - output effect of r & d as well as the substitution relationship among input factors. moreover, the thesis also makes a methodological discussion of multicollinearity, and proposes a feasible approach to deal with the problem
首先，在生產函數的投入要素向量中引入r & d投入變量，包括r & d人力投入和r & d資本投入;然後，結合相關的研究經驗和本文的研究目的，構建了相應的二級ces生產函數模型;在此基礎之上，採用2003年上海主要製造業企業的橫截面數據，分行業研究了r & d投入對產出的作用以及r & d投入與非r & d投入之間的替代關系。
分享友人