直流辉光等离子体助进热丝CVD法沉积金刚石薄膜

要用直流辉光等离子体助进热丝CVD的方法，低温（550－620℃）沉积得到晶态金刚石薄膜。经X射线衍射谱扫描电子显微镜及Raman光谱分析表明：稍高气压有利于金刚石薄膜的快速、致密生长。     

20世纪后期呼和浩特地区气温变化特点及其环境效应

根据1961年～1999年39年的气温变化数据,系统分析了呼和浩特地区在20世纪后期气温变化的特点以及因此而引起的环境效应.认为:无论是在全年气温变化趋势上,还是在特征时段或特征月份的变化趋势上,呼和浩特均经历了气温的上升和变幅增大的过程,这一过程清晰地存在于3个13年自然分期和4个10年分期中,表现为后一时期气温平均值和变幅均较前一时期高,且在20世纪90年代这一过程达到了近40年中的最高峰,从而造成了许多环境效应———暖冬、旱化、环境频变、生态脆弱等.     

苯乙烯甲基丙烯酸甲酯高温共聚合反应的研究

本文研究了苯乙烯和甲基丙烯酸甲酯的高温共聚合反应。由实验得出,200℃时的共聚合体系(r_1=2.76,r_2=0.35,r_1×r_2=0.97)接近于理想共聚(r_1×r_2=1),还得出,高温条件下二者的共聚合的解聚反应是相当可观的。     

Temperature dependence of surface enhanced Raman scattering on C<Subscript>70</Subscript>

The temperature dependence of surface enhanced Raman scattering of the C70 molecule is reported. The Raman scattering of C70 molecules adsorbed on the surface of a silver mirror was measured at different temperatures. The experimental results indicate that the relative intensities of the Raman features vary with the temperature of the sample. When the temperature decreases from room temperature to 0℃, the relative intensifies of certain Raman bands decrease abruptly. If we like the strongest band 1565cm^-1 as a standard value 100, the greatest decrease approaches to 43%. However, with the further decrease in the temperature these relative intensities increase and resume the value at room temperature. And such a temperature dependence is reversible. Our results show that the adsorption state of the C70 molecules on the silver surface around 0℃ changes greatly with the temperature, resulting in a decrease in relative intensities for some main Raman features of C70 molecule. When the temperature is lower than 0℃, the adsorption state changes continually and more slowly. Synchronously, eight new Raman features, which have not ever been reported in fiterature, are observed in our experiment and this enriches the basic information of the vibrational modes for C70 molecule.     

35 ka BP climate simulations in East Asia and probing the mechanisms of climate changes

Interglacial or postglacial climates are all of charac-teristic of warmer conditions. However, if condition asso-ciated with the warm feature is wetter or drier than today,it would produce different impacts on natural environ-ments and human society. Quaternary studies found thatclimate with warm-dry or warm-wet conditions had oc-curred in China during the last 40—30 ka BP[1]. For ex-ample, it was warmer than the present during themid-Holocene (3—8 ka BP) and the late phases of MarineIsot…     

Relationship between the simulated East Asian westerly jet biases and seasonal evolution of rainbelt over eastern China

Due to the particular geographical location and topog- raphical features, the East Asia exhibits prominent mon- soonal climate with significant seasonal variation and complex spatial distribution of climatic elements. There are many difficulties in simulating and forecasting the weather and climate over East Asia by using climate model system. Generally speaking, the capability and performance of the currently widely-used climate modelsin East Asia are not satisfied. It is of scientific sign…     

速滑运动员基础体温的研究——兼谈不同负荷强度时体温变化的特点

在长期跟队观察和测量的基础上,对30名优秀速滑运动员(男15名x 22.5岁,女15名x19.11岁,其中运动键将27名占90%)的基础体温及其他条件下的体温,心率和血乳酸进行初步研究。结果证明:我国速滑运动员的基础体温低于我国正常成人和其他项目运动员的均值,并表现出波动性,阶段性和专项性特点。在比赛中速滑运动员体温急剧下降,下降的幅度与滑跑速度和气温有密切的关系。速滑运动员体温的测量与评定,对评价运动员的身体机能状况和训练水平具有一定的实用价值和参考依据。     

石墨C—C键的温度、压力效应及键长的Raman频率表征

本文在20℃～550℃,0GPa～13GPa压力区间内测量了石墨的Raman光谱,并在20℃～1100℃温度范围内做了石墨的X光衍射实验。实验结果表明,TG64型石墨在20℃～750℃温度范围内C-C键长随温度升高而收缩,温度高于750℃时键长随温度升高而膨胀。高压Raman的结果表明,石墨的E_(2q)活性模的频率随压力升高分段线性收缩,分段点在4GPa附近。同时还对在常温常压下利用Raman频率计算石墨C—C键长的Fitzer公式做了修正,并分别给出了温度和压力的修正因子以及C—C键力常数随温度、压力变化的规律。