共查询到18条相似文献，搜索用时 166 毫秒
1.
付淑英 《韩山师范学院学报》2010,31(3):35-37,42
以直流反应磁控溅射方法在Si（111）基底上制备薄膜TiN.研究发现：在保持其他工艺参数不变的条件下,溅射气压在0.3～1.3 Pa范围内,薄膜的主要成分是（111）择优取向的立方相TiN.当溅射气压为0.5 Pa时,沉积的薄膜膜层致密均匀,色泽金黄,膜厚为115.8 nm,结晶性能好.在可见光区半透明而在红外光区呈高反射,红外反射率为90%,具有良好的太阳光谱选择性. 相似文献
2.
LIAO Bang-liang MA Jian-guang ZHU Wei-hu ZHU Hong-mei YANG Kai LIU Yan-hong Li Huai-lin WANG Xiao-jing WANG Xin-lin 《重庆大学学报(英文版)》2018,17(1):17-26
To improve the oxidation resistance and corrosion resistance of Zr-4 alloy, titanium nitride(TiN) coatings were prepared on the Zr-4 alloy with a TiN ceramic target with different ratios of N_2. Microstructure and high-temperature properties of the TiN coated samples were studied by scanning electron microscopy(SEM), energy dispersive spectrometer(EDS), X-ray diffraction meter(XRD), X-ray photoelectron spectroscopy(XPS), heat treatment furnace and autoclaves, respectively. The x value of the TiN coatings(TiN_x) ranges from 0.96 to 1.33. After the introduction of N_2, TiN coating exhibits a weak(200) plane and a preferred(111) orientation. The coating prepared with an N_2 flow ratio of 15% shows an optimal oxidation resistance in the atmospheric environment at 800 °C. In either 1 200 °C steam environment for one hour, or deionized water at 360 °C and a pressure of 18.6 Mpa for 16 d, the opitimized TiN coated samples have no delamination or spallation; and the gains in the masses of samples are much smaller than Zr-4 alloy. These results demonstrate the effectiveness of the optimized TiN coating as the protective coating on the Zr-4 alloy under extreme conditons. 相似文献
3.
报导了一种用于自组装膜研究的原子级平整金基底的制备方法。采用这种方法，得到全以(111)取向的原子级平整基底，同时使用扫描探针显微镜(SPM)考察了该种金基底的自组装性能。 相似文献
4.
Xiao-pei LU Da-wei YAO Yi CHEN Li-tian WANG An-ping DONG Liang MENG Jia-bin LIU 《浙江大学学报(A卷英文版)》2014,(2)
研究目的:阐明铜铁合金在拉拔变形过程中,微观组织和硬度的变化规律。创新要点:1.考察铜铁合金变形过程中,铜基体和铁枝晶组织的变化特点;2.研究铁纤维的尺寸及Cu/Fe相界面密度与合金变形量的关系;3.探讨了铁纤维与硬度关系符合Hall-Petch关系的匹配程度。研究方法:1.通过固溶时效处理使得铁枝晶均匀地分布在铜基体中;2.通过冷拉拔手段使得铜合金从棒状逐步变形成线材;3.使用扫描电镜观察微观组织,并使用维氏硬度仪测试样品硬度。重要结论:1.铁枝晶在合金变形过程中逐渐变成铁纤维。随着冷变形进行,线材纵截面的铜纤维形成(110)择优取向,铁纤维形成(100)择优取向;在横截面上的铜纤维形成(111)择优取向,铁纤维形成(110)择优取向;2.铁纤维的厚度、宽度和间距随变形量的增加呈指数降低,Cu/Fe相界面密度随铁纤维宽厚比的增加而呈指数增加。在变形量小于6.0时,铁相的应变随变形量线性增加,当变形量大于6.0时,铁相的应变偏离这种关系;3.铁纤维的间距和合金硬度存在Hall-Petch关系。当变形量小于3.0时,纤维组织细化对硬度带来的影响较为明显。 相似文献
5.
张媛 《济南职业学院学报》2001,(4):61
1 改进前实验全过程用半透膜制成一个袋 ,往这个袋里注入淀粉胶体 1 0毫升和食盐溶液 5毫升的混合液体 ,然后采用如图 1所示的方法 ,用线把半透膜袋的上口缚好 ,系在玻璃棒上 ,并把它悬挂在盛有蒸馏水的烧杯里。几分钟后 ,用两个试管各取烧杯里的液体 5毫升 ,往其中一个试管里注入少量硝酸银溶液 ,往另一个试管里注入少量碘水 ,然后观察两个试管里发生的变化。图 1缺点 :( 1 )半透膜是动物的膀胱膜、肠衣等 ,不经济。( 2 )实验操作比较复杂。( 3)半透膜不容易购买。2 改进后实验全过程把淀粉胶体 1 0毫升和食盐溶液 5毫升的混合液体注入自… 相似文献
6.
报导了一种用于自组装膜研究的原子级平整金基底的制备方法。采用这种方法,得到金以(111)取 向的原子级平整基底,同时使用扫描探针显微镜(SPM)考察了该种金基底的自组装性能。 相似文献
7.
离子注入聚醚砜薄膜的导电特性研究 总被引：1，自引：0，他引：1
岳喜成 《南阳师范学院学报》2003,2(9):37-40,45
用15keV的N^ 和Ar^ 注入PES，纯PES膜表面电导率提高了5个数量级，掺碘PES膜表面电导率提高4个数量级。表面电导率随剂量的变化关系具有饱和性。掺碘使未注入的PES膜表面电导率提高近一个数量级，掺碘对提高注入离子的PES膜的表面电导率作用不大。在低剂量时，注Ar^ 样品的表面电导率大于注N^ 样品的表面电导率。在最高剂量时，表面电导率和注入离子的种类无关。离子注入PES膜的表面电导率在空气中非常稳定。在0～30V范围内，离子注入PES膜的表面电导率随电压的增加而缓慢增加。 相似文献
8.
用电子束蒸镀方法在250℃~450℃的衬底温度范围内在单晶Si衬底(111)晶面上成功生长了Zn0.85Co0.14Cu0.01O薄膜,并研究了衬底温度对薄膜质量的影响,结果表明:当衬底温度为400℃时,外延膜取向性最好,且其(002)衍射峰半高宽最窄,仅为0.408°。 相似文献
9.
用电子束蒸镀方法在250℃～450℃的衬底温度范围内在单晶Si村底(111)晶面上成功生长了Zn0.85 Co0.14 Cu0.01O薄膜,并研究了衬底温度对薄膜质量的影响,结果表明:当衬底温度为400℃时,外延膜取向性最好,且其(002)衍射峰半高宽最窄,仅为0.408°. 相似文献
10.
用直流磁控溅射技术在室温下制备了厚度为108和215nmAu膜。利用常规CBD扫描模式对Au膜微结构进行分析。XRD分析表明Au膜在平行于基片表面沿<111>方向择优生长;薄膜的晶格常数与金粉末的晶格常数(a=4.0862F)一致,晶粒尺寸随膜厚变化不明显。 相似文献
11.
INTRODUCTION Monocrystalline SBN (Strontium barium nio-bium, SrxBa1?xNb2O6, denoted SBNx?100, where 0.25≤x≤0.75) solid solution, is currently being inves-tigated as potential material for many micro-device applications, such as piezoelectric infrared detectors, piezoelectric, electro-optic modulators, and holo-graphic storage (Koch et al., 1998), because SBN has one of the largest known linear electro-optic coeffi-cients (r33=1300 pm/V for SBN75), two orders of magnitude larger th… 相似文献
12.
The structural characteristics and optical and electrical properties of molecular-beam-epitaxy (MBE) grown ZnS0.8Se0.2 thin films on indium-tin-oxide (ITO) glass substrates were investigated in this work. The X-ray diffraction (XRD)results indicated that high quality polycrystalline ZnS0.8Se0.2 thin film grown at the optimized temperature had a preferred orientation along the (111) planes. The transmission electron microscopy (TEM) cross-sectional micrograph of the sample showed a well defined columnar structure with lateral crystal dimension in the order ofa few hundred angstroms. Ultraviolet (UV) photoresponsivity as high as 0.01 A/W had been demonstrated and for wavelengths longer than 450 nm, the response was down from the peak response by more than 3 orders of magnitude. The thin ZnS0.8Se0.2 photosensor layer, with a wide energy gap and anisotropic electrical property, makes a transmission UV liquid crystal light valve ( LCLV) with high resolution feasible. 相似文献
13.
INTRODUCTION Liquid crystal light valves (LCLV) are devices whose function is to convert an input image pos-sessing specific wavelength, intensity and coher-ence to an output image in which some or all of these parameters are varied (Efron et al., 1985). Therefore, they can be used as image amplifiers for large screen projection display, image wavelength converters and incoherent-to-coherent image converters for optical data processing and correlation. The appli-cation potentialities ar… 相似文献
14.
MBE growth of ZnSxSe1-x thin films on ITO coated glass substrates were carried out using ZnS and Se sources with the substrate temperature ranging from 270℃ to 330℃. The XRD θ/2θ spectra resulted from these films indicated that the as-grown polycrystalline ZnSxSe1-x thin films had a preferred orientation along the (111) planes. The evaluated crystal sizes as deduced from the FWHM of the XRD layer peaks showed strong growth temperature dependence, with the optimized temperature being about 290℃. Both AFM and TEM measurements of these thin films also indicated a similar growth temperature dependence. High quality ZnSxSe1-x thin film grown at the optimized temperature had the smoothest surface with lowest RMS value of 1.2 nm and TEM cross-sectional micrograph showing a well defined columnar structure. 相似文献
15.
用电化学阳极氧化法制备了一定孔隙率的多孔硅样品,然后用脉冲激光沉积法以PS为衬底生长一层ZnS薄膜.用X射线衍射仪、扫描电子显微镜和荧光分光光度计分别表征了ZnS薄膜的结构、形貌和ZnS/PS复合膜的光致发光性质.XRD结果表明,制备的ZnS薄膜沿β-ZnS(111)方向择优生长,结晶质量良好,但衍射峰的半峰全宽较大;SEM图像显示,ZnS薄膜表面出现一些凹坑,这是衬底PS的表面粗糙所致.室温下的光致发光谱表明,沉积ZnS薄膜后,PS的发光峰蓝移.把ZnS的蓝绿光与PS的橙红光叠加,在可见光区450~700 nm形成了一个较宽的光致发光谱带,ZnS/PS复合膜呈现较强的白光发射. 相似文献
16.
Jeffrey P. Dorman 《Educational studies》2008,34(4):299-308
Students’ perceptions of actual and preferred classroom environment were investigated using the What is happening in this class? questionnaire (WIHIC). The WIHIC assesses seven classroom environment dimensions: student cohesiveness, teacher support, involvement, task orientation, investigation, cooperation and equity. A sample of 978 secondary school students from 63 classes in Queensland responded to the WIHIC. For each item on the WIHIC, students recorded their perceptions of the actual (or real) and preferred (or ideal) classroom environment. Results revealed that statistically significant differences between actual and preferred environments, and that the gap between actual and preferred environment was smaller for more positive classroom environments. 相似文献
17.
MBE growth of ZnSxSe1−x thin films on ITO coated glass substrates were carried out using ZnS and Se sources with the substrate temperature ranging
from 270°C to 330°C. The XRD σ/2σ spectra resulted from these films indicated that the as-grown polycrystalline ZnSxSe1−x thin films had a preferred orientation along the (111) planes. The evaluated crystal sizes as deduced from the FWHM of the
XRD layer peaks showed strong growth temperature dependence, with the optimized temperature being about 290 °C. Both AFM and
TEM measurements of these thin films also indicated a similar growth temperature dependence. High quality ZnSxSe1−x thin film grown at the optimized temperature had the smoothest surface with lowest RMS value of 1.2 nm and TEM cross-sectional
micrograph showing a well defined columnar structure.
Project supported by the National Science Council of PRC (No. 59910161981) and RGC grant from the Hong Kong Government under
Grant (No. NS-FC/HKUST 35) 相似文献
18.
Kristina Zoldosova Pavol Prokop 《International Journal of Science and Mathematics Education》2006,4(4):669-688
Pupils' motivation and interest are identified as important influences on learning. Motivational orientation is a construct that links motivation and epistemology. This study attempted to explore motivational orientation as it relates to science education and two different instructional approaches. A published instrument standardized with a population from the United Kingdom that purports to identify students' preferred motivation orientations as social, consciousness, effort, or curiosity was applied to two instructional contexts (traditional school program and field centre program) in primary schools in Slovakia. Results indicated that a very high percentage of the pupils could not be classified into one of the four categories, that the traditional classroom sample differed significantly from the United Kingdom population, and that the preferred motivational orientations expressed by the pupils in the field centre sample did not differ significantly from those expressed by the pupils in the traditional classroom sample. 相似文献