新型AgInSbTe相变薄膜的结晶活化能研究

利用磁控溅射法制备了新型AgInSbTe相变薄膜，热处理前后的X射线衍射(XRD)表明了薄膜在热作用下从非晶态转变到晶态．通过非晶态薄膜粉末的示差扫描量热(DSC)实验测定了不同升温速率条件下的结晶峰温度，计算了粉末的摩尔结晶活化能、原子激活能和频率因子,从结晶活化能E可以判断出新型AgInSbTe相变薄膜具有较高的结晶速度，可以用于高速可擦重写相变光盘．

Modelization and analysis of the electric arc in low voltage circuit breakers

246 p.

热致NiOx薄膜的结构和光学性质变化

利用直流磁控反应溅射技术制备了氧气和氩气的分压比为5:100的NiOx薄膜。利用X射线衍射仪(XRD)、扫描电镜(SEM)、原子力显微镜(AFM)和光谱仪研究了热处理对薄膜的微观结构和光学性质的影响, 并对沉积态薄膜的粉末进行了热分析。沉积态的NiOx薄膜在262 ℃时开始分解, 导致NiOx薄膜的透过率增加和反射率降低。X射线衍射和示差扫描量热曲线(DSC)分析表明, 在热处理过程中并无物相的变化, 光学性质的变化是由于NiOx薄膜热分解引起薄膜表面形貌发生变化而引起的。通过Kissinger公式计算出

Nd-glass belt lasers with improved beam quality

Nd-doped phosphate glass belt lasers pumped by laser diodes are demonstrated. The Nd-glass belt with a large cross-section and a small Fresnel number is air-cooled to provide around 18-W continuous wave (CW) output power with a beam quality factor of My2

Structure and thermal stability of novel fluorophosphate glasses

A systematic investigation on glass formation in the PbF2-InF3-BaHPO4 ternary system has been carried out. These glasses have characterized by IR spectra, Raman spectra and differential thermal analysis. The results show that the structure of these glasses is mainly affected by BaHPO4 and InF3 contents. With decreasing BaHPO4 content, the glass structure gradually transforms from metaphosphate to polyphosphate. When InF3 content is low, it mainly acts as network modifier, when its content is high; it enters glass matrix and forms In(O,F)(6) groups connecting the polymerized phosphorus oxygen species. PbF2 mainly acts as network modifier in this system. Systematic variations of the glass transition temperature and the thermal stability index agree well with these results. The most stable glass with Delta T = 230 degrees C and S = 21.79 K is obtained. (c) 2004 Elsevier B.V. All rights reserved.

Planar waveguides formed in a new chemically stable Er3+/Yb3+ co-doped phosphate glass

A new Er(3+)/Yb(3+) co-doped phosphate glass has been prepared, which exhibits good chemical durability and spectralproperties. Planar graded index waveguides have been fabricated in the glass by (Ag+)-Na(+) ion exchange in a mixed melt of silver nitrate and potassium nitrate. Ion exchange is carried out by varying the process parameters such as temperature, diffusion time, and molten salt compositions. The diffusion parameters, diffusion coefficients, and activation energy are determined by the guidelines of fabricated waveguides, which are determined by the input prism coupling technique.

A novel polarization modulator for a Moire system with grating imaging

A polarization modulator based on splitting with a Savart plate and rotation of an analyzer for a moire system with grating imaging is presented, and its modulation principle is analyzed. The polarization modulator is simple and achromatic. It is composed of a polarizer, a Savart plate, and an analyzer. The polarizer and the Savart plate are placed in front of the index grating to split the image of the scale grating in the moire system. The analyzer is placed behind the grating and rotated to realize the modulation of the moire signal. The analyzer can be rotated either continually with high speed or step by step with low speed to form different modulation modes. The polarization modulator makes the moire system insensitive to the change of initial intensity. In experiments, we verified the usefulness of the polarization modulator.

Adolescência e sentido de vida

Esta pesquisa tem como problema de investigação o sentido de vida na adolescência. E os objetivos a alcançar foram: discutir questões atuais relativas à adolescência; analisar questões centrais da Logoterapia, propostas por Viktor Frankl; e investigar empiricamente o sentido de vida na adolescência. Na pesquisa ex post facto realizada, foram submetidas à corroboração cinco conjecturas, relacionando adolescência, sexo, orientação confessional da escola e sentido de vida. Os participantes foram 230 alunos, cuja idade variou de 16 a 18 anos, sendo 91 do sexo masculino e 139 do sexo feminino, todos eles matriculados em escolas públicas e privadas do Ensino Médio da cidade de Petrópolis, Estado do Rio de Janeiro, Brasil. Foram selecionadas duas escolas públicas, uma estadual e uma municipal, além de quatro escolas privadas, sendo duas leigas e duas confessionais, que atendem alunos de classe sócio-econômica diferenciada. Utilizamos o Logo-Teste, originalmente elaborado por Elizabeth Lukas, como instrumento de medida do sentido de vida dos participantes. Das cinco conjecturas testadas, duas foram corroboradas: a de que não há diferença significativa no sentido de vida entre adolescentes do sexo masculino e do sexo feminino e a de que não há diferença significativa no sentido de vida entre adolescentes de escolas públicas e particulares leigas. Além disso, observou-se que as médias obtidas por todos os grupos de participantes situam-se na faixa da estabilidade psíquica, sem riscos de ocorrência de neurose noógena ou depressão noógena.

Ti:sapphire laser pumped high average power laser crystal Nd:GGG with high efficiency output

High-quality neodymium doped GGG laser crystals have been grown by Czochralski (Cz) method. Results of Nd:GGG thin chip laser operating at 1.064 μm pumped by Ti:sapphire laser operating at 808 nm were reported. The slop efficiency was as high as 20%.