Thermo-plastic instability in simple shear

A theoretical description of thermo-plastic instability in simple shear is presented in a system of equations describing plastic deformation, the first law of thermodynamics and Fourier's heat transfer rule. Both mechanical and thermodynamical parameters influence instability and it is shown that two different modes of instability may exist. One of them is dominated by thermal softening and has a characteristic time and length, connected to each other by thermal diffusion.A criterion combining thermal softening, current stress, density, specific heat, work-hardening, thermal conductivity and current strain rate is obtained and practical implications are discussed.

Frente Parlamentar Mista das Micro e Pequenas Empresas : lógica de funcionamento e resultados

Analisa o modo com que os parlamentares se organizam frente à estrutura institucional no Congresso Nacional. Tem como referências para discussão, contribuições de Barry Ames (2003) e Figueiredo e Limongi (2001) que apresentam dois modelos de funcionamento do Parlamento, o distributivista e o partidário. Analisa a atuação da Frente Parlamentar Mista das Micro e Pequenas Empresas. Enfatiza a segunda fase de funcionamento da Frente, os anos de 2008 e 2009, quando trabalhou pela regulamentação da Lei Geral das Micro e Pequenas Empresas (Lei Complementar nº 123/06) nos Estados e Municípios e seus aperfeiçoamentos por meio da aprovação de Leis Complementares nºs 127/07, 128/08 e 133/09.

An Overview on the Field of Micro- and Nanotechnologies for Synthetic Peptide-Based Vaccines

18 p.

Valoración de la Cooperación Inter-empresarial en las Microempresas del Municipio de Murcia, proyectos Micro y e-Micro (2002-2007)

[ES] El marco teórico del trabajo tiene como finalidad explicar los procesos de cooperación diseñados para las microempresas, con el propósito de establecer propuestas y argumentos para la formación de acuerdos, identificar los factores que afectan el desarrollo de los mismos, así como los sistemas de innovación nacional, regional y local para la animación de la cooperación entre firmas. Con ello, se propone una metodología para promover la cooperación entre microempresas, coordinada por agentes locales y la administración pública de los proyectos Micro y e-Micro (2002-2007) de la ciudad de Murcia.

Formation and Structure of Composite Coating of HAD and Micro-Plasma Oxidation on A3 Steel

Composite coatings were obtained on A3 steel by hot dipping aluminum(HAD) at 720 degreesC for 6 min and micro-plasma oxidation (MPO) in alkali electrolyte. The surface morphology, element distribution and interface structure of composite coatings were studied by means of XRD, SEM and EDS. The results show that the composite coatings obtained through HAD/MPO on A3 steel consist of four layers. From the surface to the substrate, the layer is loose Al2O3 ceramic, compact Al2O3 ceramic, At and FeAl intermetallic compound layer in turn. The adhesions among all the layers are strengthened because the ceramic layer formed at the At surface originally, FeAl intermetallic compound layer and substrate are combined in metallurgical form through mutual diffusion during HAD process. Initial experiment results disclose that the anti-corrosion performance and wear resistance of composite coating are obviously improved through HAD/MPO treatment.

Effects of shear on eggs and larvae of striped bass, morone saxatilis, and white perch, M. americana

Shear stress, generated by water movement, can kill fish eggs and larvae by causing rotation or deformation. Through the use of an experimental apparatus, a series of shear (as dynes/cm2)-mortality equations for fixed time exposures were generated for striped bass and white perch eggs and larvae. Exposure of striped bass eggs to a shear level of 350 dynes/cm2 kills 36% of the eggs in 1 min; 69% in 2 min, and 88% in 4 min; exposure of larvae to 350 dynes/cm2 kills 9.3% in 1 min, 30.0% in 2 min, and 68.1% in 4 min. A shear level of 350 dynes/cm2 kills 38% of the white perch eggs in 1 min, 41% in 2 min, 89% in 5 min, 96% in 10 min, and 98% in 20 min. A shear level of 350 dynes/cm2 applied to white perch larvae destroys 38% of the larvae in 1 min, 52% in 2 min, and 75% in 4 min. Results are experimentally used in conjunction with the determination of shear levels in the Chesapeake and Delaware Canal and ship movement for the estimation of fish egg and larval mortalities in the field.