Reaction of Cerium Oxide with Zirconium and Yttrium Oxides at 1250°C

Phase relationships in the ternary system ZrO₂ Y₂O₃ CeO₂ were investigated by x-ray diffraction analysis and electron microscopy for the first time, and phase relationships in the binary systems ZrO₂ CeO₂ and CeO₂ Y₂O₃ defined more accurately at 1250°C over the entire range of concentrations. The 1250°C isothermal section of the phase diagram for ternary system was constructed. Specimens were prepared from nitrate solutions by evaporation, drying, grinding, and subsequent annealing at 1250°C. The systems were characterized by the formation of broad solid solution ranges based on C -Y₂O₃, F-CeO₂, F-ZrO₂, and narrow based on T-ZrO₂ and -phase. No new phases were found in the systems. The path of isoparametric lines in the F-ZrO₂ solid solution field suggests that yttrium and cerium ions can substitute for each other without appreciable substitution of zirconium ions.     

Frustrated Phase Separation in the Overdoped Regime of “123” High-Tc Superconductors

Recent inelastic neutron scattering measurements revealed the crystal-field (CF) spectra of the overdoped R_{1 – y} Ca_yBa₂Cu₃O₇ (R = Ho, Er; 0 < y < 0.25) high-T _c superconductors to consist of two spectral components associated with the optimally doped and the overdoped domains. Increase of the Ca concentration does not affect the local charge density of domains, but changes the spectral weight of the components. In the sense of this two-phase picture, which was established earlier for the underdoped region, there is a smooth crossover between the under- and overdoped parts of the phase diagram. The charge origin of the observed superposition effect is confirmed by the systematic analysis of the concentration dependences of the CF parameters for both Ho- and Er-based compounds. Therefore, the local charge inhomogeneity in the CuO₂ planes of high-T _c cuprates is a characteristic feature of the doping process, which depends neither on the way to introduce doping nor on the doping level.     

Adjoint network method applied to the performance sensitivities of microwave amplifiers

This work focuses on the performance sensitivities of microwave amplifiers using the “adjoint network and adjoint variable” method, via “wave” approaches, which includes sensitivities of the transducer power gain, noise figure, and magnitudes and phases of the input and output reflection coefficients. The method can be extended to sensitivities of the other performance measure functions. The adjoint‐variable methods for design‐sensitivity analysis offer computational speed and accuracy. They can be used for efficiency‐based gradient optimization, in tolerance and yield analyses. In this work, an arbitrarily configured microwave amplifier is considered: firstly, each element in the network is modeled by the scattering matrix formulation, then the topology of the network is taken into account using the connection scattering‐matrix formulation. The wave approach is utilized in the evaluation of all the performance‐measurement functions, then sensitivity invariants are formulated using Tellegen's theorem. Performance sensitivities of the T‐ and Π‐types of distributed‐parameter amplifiers are considered as a worked example. The numerical results of T‐ and Π‐type amplifiers for the design targets of noise figure F_req = 0.46 dB ? 1,12 and V_ireq = 1, G_Treq = 12 dB ? 15.86 in the frequency range 2–11 GHz are given in comparison to each other. Furthermore, analytical methods of the “gain factorisation” and “chain sensitivity parameter” are applied to the gain and noise sensitivities as well. In addition, “numerical perturbation” is applied to calculation of all the sensitivities. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006.     

Numerical Simulation of the Thomson Scattering Experiment Performed with 0.351 μm Laser-Produced Aluminum Plasmas

The evolutions of the electron temperatures of Muminum plasmas produced with 0.351 μm laser are simulated by means of one-dimensional hydrodynamic code. The simulations show that the plasma geometry has strong influence on the electron temperature＇s evolution while the effect of the flux limiter is not so significant. The simulations are in good agreement with the experiments only at some spatial points. A full comparison between the simulations and experiments indicates that the one-dimensional code is not accurate enough to characterize the laser-produced plasmas. A post-processor code based on the hydro code is developed to generate the streak image of the Thomson scattering spectra, which can be directly compared with the experimental data.     

Testing the robustness of the job demands-resources model.

[Correction Notice: An erratum for this article was reported in Vol 14(2) of International Journal of Stress Management (see record 2007-07240-008). Several corrections of errata in a paper by the authors published in the 2006 issue of the International Journal of Stress Management are presented: (1) The sentence beginning on page 385, line 16 should read "To avoid identification problems, the error variance of Organizational commitment and Emotional load were constrained using the formula (1 - α) × sigma2." (2) The sentence on page 385, line 18, should be deleted. (3) Degrees of freedom for M3 in Table 2 were incorrectly reported. The correct degrees of freedom were 54. The corrected table is provided.] According to the job demands-resources (JD-R) model, job demands and resources evoke two relatively independent processes: health impairment and employee motivation. The robustness of the JD-R model was tested in two different occupational samples, the first of 654 Spanish employees and the second of 477 Dutch employees. Structural equation modeling analyses provided partial evidence for the two processes. Multigroup analyses showed that the structural paths of the model were invariant across countries, although the strength of the relationships differed. We conclude that the basic structure of the JD-R model is maintained, even when applied in different national and occupational contexts, when using different ways of gathering data (computerized versus paper and pencil), and when using slightly different measures to assess the key variables of the model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ge nano-layer fabricated by high-fluence low-energy ion implantation

A Ge nano-layer embedded in the surface layer of an amorphous SiO₂ film was fabricated by high-fluence low-energy ion implantation. The component, phase, nano-structure and luminescence properties of the nano-layer were studied by means of Rutherford backscattering, glancing incident X-ray diffraction, laser Raman scattering, transmission electron microscopy and photoluminescence. The relation between nano-particle characteristics and ion fluence was also studied. The results indicate that nano-crystalline Ge and nano-amorphous Ge particles coexist in the nano-layer and the ratio of nano-crystalline Ge to nano-particle Ge increases with increasing ion fluence. The intensity of photoluminescence from the nano-layer increases with increasing ion fluence also. Prepared with certain ion fluences, high-density nano-layers composed of uniform-sized nano-particles can be observed.     

Tornado API分析及第三方工具链集成技术

分析了Tornado集成开发环境及GCC编译器.重点讨论了Tornado应用程序接口.对Tornado的定制与扩展及第三方工具链的集成技术进行了较深入的探讨.修改GCC-3.3.2部分源码后,采用新的集成策略,把它成功地集成到了Tornado开发环境中.     

用VC实现PC机对激光位移传感器的通信控制

为实现弹翼廓形测量系统中激光位移传感器测量值的采集,介绍了用VC实现异步串行通信的基本原理。讨论了VC用于串口通信的几种方法,给出Win32API汇集在一起所构成的类Win32Port,并且利用该类实现了主机程序与激光位移传感器的串行通信。应用实例表明,该方法通过利用异步串行通信可方便地实现工控机对激光位移传感器的控制,有较高的可应用性。     

偶氮胭脂红B与蛋白质的共振瑞利散射研究

在酸性条件下,蛋白质与偶氮胭脂红B(ABX)结合形成离子缔合物,使ABX微弱的共振瑞利散射(RRS)急剧增强.研究了ABX与牛血清白蛋白(BSA)相应的光谱特征,影响因素及适宜的反应条件,建立了一种定量测量蛋白质的新方法.该方法灵敏度高,蛋白质的检出限在30.6～38.7μg/L之间,线性范围宽,反应迅速,操作简单.该法已经应用于人尿样、牛血清及奶粉中蛋白质含量的测定,样品的相对标准偏差小于1.9%,回收率在 96.2%～102.2%之间,结果与考马斯亮蓝法(CBB)无差异.     

纸页相对结合面积与成纸纤维柔软度相关性的研究(Ⅱ)

对湿地松未漂硫酸盐浆料纤维的柔软度及其成型后纸页密度和光散射系数之间的关系进行了研究。通过光散射系数和纸页密度间的线性关系以及纸页密度和纤维柔软度之间的线性关系推断出了光散射系数和纤维柔软度之间的关系，并以此为基础推断出了纸页相对结合面积RBA以纤维柔软度来表征的一种新的计算关系式。这个关系式有助于理解纤维间的结合，并可对实现纸页物理性能在线测量提供很大的帮助。