Fracture properties of silicon carbide thin films by bulge test of long rectangular membrane

This paper reports the mechanical properties and fracture behavior of silicon carbide (3C-SiC) thin films grown on silicon substrates. Using bulge testing combined with a refined load-deflection model of long rectangular membranes, which takes into account the bending stiffness and prestress of the membrane material, the Young's modulus, prestress, and fracture strength for the 3C-SiC thin films with thicknesses of 0.40 and 1.42 mu m were extracted. The stress distribution in the membranes under a load was calculated analytically. The prestresses for the two films were 322 +/- 47 and 201 +/- 34 MPa, respectively. The thinner 3C-SiC film with a strong (111) orientation has a plane-gstrain moduli of 415 +/- 61 GPa, whereas the thicker film with a mixture of both (111) and (110) orientations exhibited a plane-strain moduli of 329 +/- 49 GPa. The corresponding fracture strengths for the two kinds of SiC films were 6.49 +/- 0.88 and 3.16 +/- 0.38 GPa, respectively. The reference stresses were computed by integrating the local stress of the membrane at the fracture over edge, surface, and volume of the specimens and were fitted with Weibull distribution function. For the 0.40-mu m-thick membranes, the surface integration has a better agreement between the data and the model, implying that the surface flaws are the dominant fracture origin. For the 1.42-mu m-thick membranes, the surface integration presented only a slightly better fitting quality than the other two, and therefore, it is difficult to rule out unambiguously the effects of the volume and edge flaws.

Smart universal multiple-valued logic gates by transferring single electrons

This paper proposes smart universal multiple-valued (MV) logic gates by transferring single electrons (SEs). The logic gates are based on MOSFET based SE turnstiles that can accurately transfer SEs with high speed at high temperature. The number of electrons transferred per cycle by the SE turnstile is a quantized function of its gate voltage, and this characteristic is fully exploited to compactly finish MV logic operations. First, we build arbitrary MV literal gates by using pairs of SE turnstiles. Then, we propose universal MV logic-to-value conversion gates and MV analog-digital conversion circuits. We propose a SPICE model to describe the behavior of the MOSFET based SE turnstile. We simulate the performances of the proposed gates. The MV logic gates have small number of transistors and low power dissipations.

基于DOM解析器的XML编辑器研究

DOM是一种独立于语言和平台的XML解析模型。给出了支持DOM核心模型和多种DOM扩展规范的XML编辑器ONCEXMLEditor的实现。ONCEXMLEditor具有高效的XML验证和序列化性能,同时提供给用户多种功能,包括按需遍历文档、提供上下文感知的编写环境、实时纠错、灵活的装载和序列化机制等。描述了ONCEXMLEditor的体系结构及其实现核心算法,同时给出了XML文档有效性验证和装载及序列化的性能优化策略。

High-Saturation-Power and High-Speed Ge-on-SOI p-i-n Photodetectors

Ge-on-silicon-on-insulator p-i-n photodetectors were fabricated using an ultralow-temperature Ge buffer by ultrahigh-vacuum chemical vapor deposition. For a detector of 70-mu m diameter, the 1-dB small-signal compression power was about 110.5 mW. The 3-dB bandwidth at 3-V reverse bias was 13.4 GHz.

Fermi-Level Pinning at Metal/High-k Interface Influenced by Electron State Density of Metal Gate

The Fermi-level pinning (FLP) at the metal/high-k interface and its dependence on the electron state density of the metal gate are investigated. It is found that the FLP is largely determined by the distortion of the vacuum level of the metal which is quantitatively ruled by the electron state density of the metal. The physical origin of the vacuum level distortion of the metal is attributed to an image charge of the interface charge in the metal. Such results indicate that the effective work function of the metal/high-k stack is also governed by the electron state density of the metal.

笔式界面软件快速开发工具

笔式界面软件快速开发工具Visual PBAP(pen-based application)Creator可以根据用户的个性化需求快速设计和开发相应软件,缩短开发周期。一方面,Visual PBAP Creator通过场景和UI编辑方便开发人员和用户确定需求;另一方面,自动生成代码可以缩短开发周期。Visual PBAP Creator以笔式操作平台为软件平台,采用基于场景设计的开发方法,设计结果形成XML格式的文档,通过解析这些XML文档最终生成C代码。实践表明,VisualPBAP Creator可以提高笔式界面软件的开发效率。

Anais...

Segurança Biológica na Agropecuária e Meio Ambiente; Segurança Biológica na Agropecuária, Alimentos, Nutrição e Saúde; Normas Internacionais de Medidas Fitossanitárias; Invasões Biológicas - Um Desafio dos Novos Tempos; Pesquisas Envolvendo Segurança Biológica na Embrapa Acre; Pesquisas Envolvendo Segurança Biológica na Embrapa Rondônia; Pesquisas Envolvendo Segurança Biológica na Embrapa Roraima; Pesquisas Envolvendo Segurança Biológica na Embrapa Amapá Pesquisas Envolvendo Segurança Biológica na Embrapa Amazônia Oriental

Emacs Lisp in Edwin SScheme

The MIT-Scheme program development environment includes a general-purpose text editor, Edwin, that has an extension language, Edwin Scheme. Edwin is very similar to another general-purpose text editor, GNU Emacs, which also has an extension language, Emacs Lisp. The popularity of GNU Emacs has lead to a large library of tools written in Emacs Lisp. The goal of this thesis is to implement a useful subset of Emacs Lisp in Edwin Scheme. This subset was chosen to be sufficient for simple operation of the GNUS news reading program.

KBEmacs: A Step Toward the Programmer's Apprentice

The Knowledge-Based Editor in Emacs (KBEmacs) is the current demonstration system implemented as part of the Programmer's Apprentice project. KBEmacs is capable of acting as a semi-expert assistant to a person who is writing a program ??king over some parts of the programming task. Using KBEmacs, it is possible to construct a program by issuing a series of high level commands. This series of commands can be as much as an order of magnitude shorter than the program is describes. KBEmacs is capable of operating on Ada and Lisp programs of realistic size and complexity. Although KBEmacs is neither fast enough nor robust enough to be considered a true prototype, both of these problems could be overcome if the system were to be reimplemented.

Presentation Based User Interface

A prototype presentation system base is described. It offers mechanisms, tools, and ready-made parts for building user interfaces. A general user interface model underlies the base, organized around the concept of a presentation: a visible text or graphic for conveying information. Te base and model emphasize domain independence and style independence, to apply to the widest possible range of interfaces. The primitive presentation system model treats the interface as a system of processes maintaining a semantic relation between an application data base and a presentation data base, the symbolic screen description containing presentations. A presenter continually updates the presentation data base from the application data base. The user manipulates presentations with a presentation editor. A recognizer translates the user's presentation manipulation into application data base commands. The primitive presentation system can be extended to model more complex systems by attaching additional presentation systems. In order to illustrate the model's generality and descriptive capabilities, extended model structures for several existing user interfaces are discussed. The base provides support for building the application and presentation data bases, linked together into a single, uniform network, including descriptions of classes of objects as we as the objects themselves. The base provides an initial presentation data base network graphics to continually display it, and editing functions. A variety of tools and mechanisms help create and control presenters and recognizers. To demonstrate the base's utility, three interfaces to an operating system were constructed, embodying different styles: icons, menu, and graphical annotation.

Ferramentas automatizadas para a manutenção e acesso a dados das Agências de Informação da Embrapa: apostila de treinamento.

Elementos de dados. Manipulação da estrutura da árvore. Preparação da árvore para o editor de conteúdo. Editor de conteúdo de nó. Pre-catalogação de recursos. Publicação do Site de uma Agência.

Anais...

Segurança Biológica na Agropecuária e Meio Ambiente; Segurança Biológica na Agropecuária, Alimentos, Nutrição e Saúde; Normas Internacionais de Medidas Fitossanitárias; Invasões Biológicas - Um Desafio dos Novos Tempos; Pesquisas Envolvendo Segurança Biológica na Embrapa Acre; Pesquisas Envolvendo Segurança Biológica na Embrapa Rondônia; Pesquisas Envolvendo Segurança Biológica na Embrapa Roraima; Pesquisas Envolvendo Segurança Biológica na Embrapa Amapá Pesquisas Envolvendo Segurança Biológica na Embrapa Amazônia Oriental

The effect of the product cost factor on error handling in industrial robots

N.W. Hardy and M.H. Lee. The effect of the product cost factor on error handling in industrial robots. In Maria Gini, editor, Detecting and Resolving Errors in Manufacturing Systems. Papers from the 1994 AAAI Spring Symposium Series, pages 59-64, Menlo Park, CA, March 1994. The AAAI Press. Technical Report SS-94-04, ISBN 0-929280-60-1.

BLID: an Application of Logical Information Systems in Bioinformatics

Ferr?, S. and King, R. D. (2004) BLID: an Application of Logical Information Systems in Bioinformatics. In P. Eklund (editor), 2nd International Conference on Formal Concept Analysis (ICFCA), Feb 2004. LNCS 2961, Springer.

Dictionary of Continental Celtic Place-Names: A Celtic Companion to the Barrington Atlas of the Greek and Roman World

Falileyev, Alexander, in collaboration with Ashwin E. Gohil and Naomi Ward, Dictionary of Continental Celtic Place-Names: A Celtic Companion to the Barrington Atlas of the Greek and Roman World (CMCS Publications: Aberystwyth, 2010) Editor: Falileyev, Alexander in collaboration with Ashwin E. Gohil and Naomi Ward