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排序方式: 共有641条查询结果,搜索用时 46 毫秒
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Alexis T. Bell 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(3):369-381
The plasma polymerization of ethylene is used as an example through which to discuss the elementary steps involved in forming a polymer in an electric discharge. The relationship of the experimentally controlled variables to the rate of formation of first generation active species is discussed. These species are related, in turn, to the overall rate of polymerization through a simple model. Two asymptotic conditions are discussed which correspond to minimal and total conversion of monomer to polymer. The dependence of polymer deposition rate on monomer flow rate predicted by the model is found to correspond very closely to that observed experimentally. The predicted effect of gas pressure on polymer deposition rate also agrees with that found experimentally. 相似文献
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Anton Setzer 《Archive for Mathematical Logic》2000,39(3):155-181
We define a type theory MLM, which has proof theoretical strength slightly greater then Rathjen's theory KPM. This is achieved
by replacing the universe in Martin-L?f's Type Theory by a new universe V having the property that for every function f, mapping families of sets in V to families of sets in V, there exists a universe inside V closed under f. We show that the proof theoretical strength of MLM is . This is slightly greater than , and shows that V can be considered to be a Mahlo-universe. Together with [Se96a] it follows .
Received: 8 February 1996 相似文献
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K.D. Setzer 《Journal of Molecular Spectroscopy》2003,221(1):127-130
Emission spectra of the 0-0 band of the a1Δg→X3Σ−g magnetic dipole transition of S2 have been observed in the near-infrared spectral region near 4400 cm−1. The S2 molecules were generated in a fast-flow system by passing Sx or S2Cl2 vapor in Ar carrier gas through a microwave discharge and were excited by electronic-to-electronic energy transfer from metastable singlet oxygen O2(a1Δg). Medium-resolution spectra of the b1Σ+g→X3Σ−g and a1Δg→X3Σ−g transitions of S2 were measured with a Fourier-transform spectrometer. By comparing the bandshape of the 0-0 band of the a→X system with a computer simulation calculated with literature data of the rotational constants of the X and a states, the origin of the 0-0 band was determined to be ν0=4394.25±0.2 cm−1. 相似文献
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Alexis F. Vasseur 《NoDEA : Nonlinear Differential Equations and Applications》2007,14(5-6):753-785
In this paper we give a new proof of the partial regularity of solutions to the incompressible Navier-Stokes equation in dimension
3 first proved by Caffarelli, Kohn and Nirenberg. The proof relies on a method introduced by De Giorgi for elliptic equations.
This work was supported in part by NSF Grant DMS-0607953. 相似文献