衬底表面预处理增强金刚石薄膜成核的研究进展   总被引：2，自引：0，他引：2  

王爱琴  王必本  党纯 《平原大学学报》2001,18(2):75-76

近年来与金刚石成核有关的技术研究取得了较大的进展。本综述了衬底表面的预处理对增强利用化学气机沉积生长金刚石薄膜成核的作用，并进行了分析和讨论。  相似文献   

不同衬底对高聚物薄膜界面微观结构的影响     

薛春荣 《常熟理工学院学报》2006,20(2):102-106,115

用同一种制备方法在玻璃和金衬底上分别制备有机高聚物薄膜;用原子力扫描显微镜对两种薄膜观测发现,高聚物—金属界面比高聚物—玻璃界面薄膜要平整、均匀的多,玻璃衬底上形成的高聚物界面高分子有明显的取向结构;用棱镜耦合法对两种不同衬底的高聚物薄膜波导进行同一条件下的m线观察,发现金属衬底上有机波导的m线要比玻璃衬底上有机波导的m线清晰。说明了衬底的不同会导致薄膜界面中的微观结构产生差异,这些差异会对波导的光学性能产生影响,解释了不同衬底的薄膜波导为何在光学性能上会出现差异。  相似文献   

准自由支撑铝薄膜系统的制备及其特征表面形貌   总被引：1，自引：0，他引：1  

张永炬 《台州学院学报》2004,26(6):43-47

采用真空蒸发的方法在液体基底表面成功制备了具有自由支撑边界条件的金属铝薄膜系统，观察并研究了薄膜中的特征表面形貌。实验发现：铝薄膜中存在着由一块块近似为长方形的畴块连接而成的自薄膜边缘向薄膜内部区域生长的特征带状结构形貌；带状结构中畴块的最大长度和最大宽度均先随薄膜厚度的增加而增大，随后稳定变小。分析认为：这些现象是由于液体基底与固体薄膜之间的特征相互作用所致。  相似文献   

雷公藤试管苗的驯化和移栽     

邹泽华  冯永涛  曾志伟  刘希华  邢建宏 《三明高等专科学校学报》2013,(6):71-75

研究炼苗时间、培养基质、栽培条件对雷公藤试管苗移栽成活率的影响。结果显示,采用3d闲瓶炼苗＋3d开瓶炼苗处理雷公藤试管苗移栽成活率最高,达63．3％。采用50mg／L的ABT3号生根粉浸泡根部、在腐殖土与红土1：1配比的基质中移栽成活率最高,达89．6％。雷公藤试管苗驯化和移栽过程中,不宜进行根叶修剪,只需剪掉近地面几片较为枯萎的叶子以便于移栽操作,移栽苗在空气湿度高于60％的条件下室外种植即可,不必进行温室培养。  相似文献   

A single session of resistance exercise does not reduce postprandial lipaemia     

Stephen F Burns  Heather Corrie  Ester Holder  Thomas Nightingale  David J Stensel 《Journal of sports sciences》2013,31(3):251-260

This study investigated the effect of a single session of resistance exercise on postprandial lipaemia. Eleven healthy normolipidaemic men with a mean age of 23 (standard error = 1.4) years performed two trials at least 1 week apart in a counterbalanced randomized design. In each trial, participants consumed a test meal (1.2?g fat, 1.1?g carbohydrate, 0.2?g protein and 68 kJ?·?kg^?1 body mass) between 08.00 and 09.00?h following a 12?h fast. The afternoon before one trial, the participants performed an 88?min bout of resistance exercise. Before the other trial, the participants were inactive (control trial). Resistance exercise was performed using free weights and included four sets of 10 repetitions of each of 11 exercises. Sets were performed at 80% of 10-repetition maximum with a 2?min work and rest interval. Venous blood samples were obtained in the fasted state and at intervals for 6?h postprandially. Fasting plasma triacylglycerol (TAG) concentration did not differ significantly between control (1.03?±?0.13?mmol?·?l^?1) and exercise (0.94?±?0.09?mmol?·?l^?1) trials (mean?± standard error). Similarly, the 6?h total area under the plasma TAG concentration versus time curve did not differ significantly between the control (9.84?±?1.40?mmol?·?l^?1?·?6?h^?1) and exercise (9.38?±?1.12?mmol?·?l^?1?·?6?h^?1) trials. These findings suggest that a single session of resistance exercise does not reduce postprandial lipaemia.  相似文献   

Evolution of fat oxidation during exercise in obese pubertal boys: Clinical implications     

Gautier Zunquin  Denis Theunynck  Bruno Sesboüé  Pierre Arhan  Dominique Bouglé 《Journal of sports sciences》2013,31(4):315-318

Abstract

In this study, we examined fat oxidation rates during exercise in obese pubescent boys. Three groups of pubescent boys (16 pre-pubescent, Tanner's stage I; 16 pubescent, Tanner's stage III; and 14 post-pubescent, Tanner's stage V) performed a graded test on a leg cycle ergometer. The first step of the test was fixed at 30 W and power was gradually increased by 20 W every 3.5 min. Oxygen consumption ([Vdot]O₂) and carbon dioxide production ([Vdot]CO₂) were determined as the means of measurements during the last 30 s of each step, which allowed us to calculate fat oxidation rates versus exercise intensity. Between 20 and 50% of peak oxygen consumption ([Vdot]O_2peak), fat oxidation rate in relative values (mg · min^?1 · kg FFM^?1) decreased continuously with pubertal development. In the same way, the maximum rate of fat oxidation occurred at a lower percentage of [Vdot]O_2peak (pre-pubescent: 49.47 ± 1.62%; pubescent: 47.43 ± 1.26%; post-pubescent: 45.00 ± 0.97%). Our results confirm that puberty is responsible for a decrease in fat free mass capacities to use fat during exercise. The results suggest that post-pubescent obese boys need to practise physical activity at a lower intensity than pre-pubescent boys to enhance lipolysis and diminish adipose tissue and the consequences of obesity.  相似文献   

衬底温度和生长速率对In0.2Ga0.8As分子束外延薄膜生长影响     

白晨皓  杨瑞霞  张强  贾月辉 《唐山师范学院学报》2009,31(5):45-46

采用分子束外廷生长技术,在GaAs衬底上制备InGaAs外廷材料。实验结果表明,衬底温度直接决定了InGaAs材料制备过程中In原子在界面间的渗析和In原子在外延层表面迁移,影响了IhGaAs外延材料的生长模式;生长速率影响着InGaAs外延层的质量。实验结果表明,通过调整衬底温度和生长速率,在衬底温度为500℃,生长速率为1200nm／h时,制备出的样品结晶质量和表面形貌最好。  相似文献   

羟基自由基产生的多因素分析     

钱美荣  王友安  叶兴刚 《十堰职业技术学院学报》2009,22(2):99-101

采用电沉积法和热形成法制得钛基二氧化铅电极,并对这两种电极的电催化性能进行比较,同时通过电沉积法所得电极考察了电流、电源和抑制剂三种因素对产生羟基自由基的影响。实验结果表明,电沉积法所得电极具有良好的电催化性能;大电流和交流电源有利于羟基自由基的产生;CO32-、PO43-、CH3COO-抑制剂存在时会消耗掉产生的羟基自由基。  相似文献   

酶催化反应理论及其应用     

刘光东  粟印环  霍瑞贞 《郧阳师范高等专科学校学报》1999,(3)

本文对酶的利用、发现与发展,特别是在各个历史时期的重大研究成果作了一些粗略的介绍,及其对酶催化反应影响的原因及变化规律,进行了阐述,充分利用酶的优良性能必将给人类带来重大的社会效益和经济效益．  相似文献   

RBP4 对游泳训练大鼠脂肪细胞IR 和IRS- 1 蛋白表达和磷酸化的影响   总被引：1，自引：0，他引：1  

张明军 《天津体育学院学报》2010,25(1):38-40

目的:观察视黄醇结合蛋白4(RBP4)对大鼠脂肪细胞IR和IRS-1蛋白表达和磷酸化的影响.方法:RBP4孵育8周游泳运动组和安静对照组大鼠(8周龄SD)脂肪细胞,检测脂肪细胞葡萄糖摄取、IR和IRS-1蛋白表达和磷酸化.结果:RBP4孵育后,运动组大鼠脂肪细胞基础和胰岛素刺激状态下葡萄糖摄取率显著高于安静对照组,游泳运动组和安静对照组大鼠脂肪细胞IR蛋白表达、磷酸化和IRS-1蛋白表达变化无统计学差异.RBP4孵育后,运动组大鼠脂肪细胞IRS-1磷酸化程度较安静对照组显著增加.结论:8周游泳运动能够增加RBP4孵育后的大鼠脂肪细胞葡萄糖摄取和IRS-1磷酸化程度,改善RBP4诱导的脂肪细胞胰岛素抵抗.  相似文献