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'2012中国钢结构行业大会

作者： Leonardo Silvestre roberval pimenta Marcos Nogueira Luci Queiroz Hernane Salles Alexandre Jordao Rodolfo Ribeiro Mariana pimenta Juliano Conceio Leonardo Rocha Felipe Buratto Eduardo Fonseca 王厚昕巴西矿冶公司(CBMM)技术部

本文以CBMM在巴西Araxa的工厂作为实例,介绍了采用微合金化钢进行工业厂房减量化设计的情况。该厂房的结构大多使用了ASTM A572微合金化钢,而不是传统的ASTM A36碳锰钢。本文从冶金角度对这两类钢各自的微观组织以及力学性能进行了评定... 详细信息

本文以CBMM在巴西Araxa的工厂作为实例,介绍了采用微合金化钢进行工业厂房减量化设计的情况。该厂房的结构大多使用了ASTM A572微合金化钢,而不是传统的ASTM A36碳锰钢。本文从冶金角度对这两类钢各自的微观组织以及力学性能进行了评定。由于铌同时提高了钢材的强度和韧性,该项目因含Nb高性能钢而节约了22%钢材消耗量。

关键词：工业建筑铌微合金化减量化设计高强度钢

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Dental treatment of twin monozygotic brothers with Fragile X syndrome

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Health 2010年第10期2卷 1199-1203页

作者： Flavia Melo Meira Luis Candido Pinto Silva Regina Haddad Rezek Ferreira roberval Almeida Cruz 不详

Fragile X syndrome (FXS) is the main cause of inherited mental retardation and is the result of transcriptional silencing of the fragile X mental retardation gene FMR1. An absence of the associated protein FMRP leads to the deregulation of many genes, which results in phenotypes of Attention-Deficit Hyperactivity Disorder (ADHD), anxiety, epilepsy and autism. The aim of this article is to report the clinical case of twin siblings affected by FXS and to describe the procedures for dental treatment with intravenous sedation. Information regarding the characteristic manifestations of FXS not only aided in the handling of the patients but also enabled us to develop clinical programs to promote and maintain oral health using individualized and specific dental procedures.

关键词： Syndromes Head and Neck/cleft Lip and Palate Fragile X Syndrome Pain Control/Sedation Oral Medicine

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Educational Press for Remote Experimentation Applied in the Spring to Study Hooke＇s Law

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Computer Technology and Application 2015年第1期6卷 1-4页

作者： Luan Carlos da Silva Casagranrde Vilson Gruber roberval Marcelino Yuri Crotti Lucas Boeira Michels Lirio Schaeffer Universidade Federal de Santa Catarina Jardim das Avenidas Ararangua 88900 Brazil Instituto Federal de Santa Catarina Cidade Alta Ararangu6 88905 Brazil Universidade Federal do Rio Grande do Sul Farroupilha Porto Alegre 91501 Brazil

The aim of this study is to report the use of RE （remote experimentation） in an educational press. The authors developed this remote experiment with the objective to study the Hooke＇s law through the analysis of the coil spring. The remote experiment is available in a website, where the students can manipulate and observe the educational press and confirm Hooke＇s statements with the output information. In addition, the students will have the opportunity to read in the website about the educational press, the physical law, and the use of the press in industrial processes. This remote experimentation exerts a force in the mechanical spring creating a deformation. In the defined point, the microcomputer will collect the data from the sensors, and it will save this data in the database. After the process execution, a graph with the data will be plotted in the website. The tests confirm that the educational press has informational potential because it returned values consistent with Hooke＇s law and the experiment presented repetition in all tests realized.

关键词： Educational press Hooke's law physical law industrial process remote experimentation.

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The Thermal Stability of (CaTiO₃)1-x (Cr_3/4Fe_5/4O₃)_x Ceramic Composites in the Microwave Region

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Materials Sciences and Applications 2016年第4期7卷 202-209页

作者： Francisco Nivaldo Aguiar Freire Manoel roberval Pimentel Santos Hélio Henrique Barbosa Rocha Ana Fabiola Leite Almeida Selma Elaine Mazzetto Antonio Jefferson Mangueira Sales Antonio Sergio Bezerra Sombra Department of Mechanical Engineering Federal University of Ceara Campus do Pici Fortaleza Brazil Western Para Federal University (UFOPA) Santarem Brazil Department of Organic and Inorganic Chemistry Federal University of Ceara Campus do Pici Fortaleza Brazil Department of Physics Federal University of Ceara Campus do Pici Fortaleza Brazil

The thermal stability, structural and dielectric properties of the (CaTiO3)1-x(Cr3/4Fe5/4O3)x ceramic composites with x = 0, 0.1, 0.5, 0.9 and 1 have been examined in microwave region. The samples were produced via the solid-state reaction. The orthorhombic structural phase of CaTiO3 and trigonal structural phase of Cr3/4Fe5/4O3 were confirmed by the X-Ray Powder Diffraction (XRPD). The XRPD patterns for composites reveal the quantities of each original phase present. The infrared spectra of the samples reinforce this structural verification indicating no or minimal occurrence of unwanted reactions. The first sample (x = 0) and last sample (x = 1) in this series exhibit the maximum and the minimum of the relative dielectric permittivity and values range from 140.1 to 8.3 respectively. The measured temperature coefficient of the matrix CaTiO3 was +921 ppm·℃-1 and for the matrix Cr3/4Fe5/4O3 was -56 ppm·℃-1. With the study of series of composites, it was possible to make a mathematical prediction for a composition reach the temperature coefficient near zero. The proposed ceramic has potential use as thermostable material in the microwave region and can be applied to resonators, low-noise amplifiers, filters, and so on.

关键词： Ceramics Composites Dielectric Properties

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