掺钛石墨导电性及其微观结构的研究

研究了不同钛掺杂量的再结晶石墨的电阻率与微观结构。以探讨掺杂组元对材料导电性能的影响。实验结果表明,与相同工艺条件下制得的纯石墨相比,掺钛石墨具有高密、高石墨化程度以及极低的电阻率的特点,微观结构分析表明,钛对材料的石墨化过程中具有催化作用,掺杂石墨材料中钛掺杂量对材料的石墨化程度有很大影响：少量钛掺杂量即可使材料达到高的石墨化程度,过多钛掺杂量不利于其电阻率的降低,分析表明钛元素在材料中是以碳化钛形式存在,但在制备过程中,有少量钛逸失,雁而在材料表面形成孔隙,而这些对材料的性能有不利的影响。     

新形势下国有企业人才战略探讨

随着我国市场经济体制的逐步确立和知识经济的到来,人才的竞争越来越激烈,国有企业面临着巨大的竞争压力。一方面是企业技术人才的短缺和引进人才的艰难,一方面却是企业人才的大量外流。新形势下国有企业确立和实施全新的切实可行的人才战略,对企业的健康发展极为重要。本文结合安钢的实际,就国有企业在新形势下应采取的人才战略,谈了一些粗浅的看法。     

Simulations of Stimulated Raman Scattering in Low-Density Plasmas

Stimulated Raman particle-in-cell （PIC） simulations scattering （SRS） in a low-density The backward stimulated Raman plasma slab is investigated by scattering （B-SRS） dominates initially and erodes the head of the pump wave, while the forward stimulated Raman scattering （F-SRS） subsequently develops and is located at the rear part of the slab. Two-stage electron acceleration may be more efficient due to the coexistence of these two instabilities. The B-SRS plasma wave with low phase velocities can accelerate the background electrons which may be further boosted to higher energies by the F-SRS plasma wave with high phase velocities. The simulations show that the peaks of the main components in both the frequency and wave number spectra occur at the positions estimated from the phase-matching conditions.