A modified split hopkinson torsional bar in studying shear localization

A modified split Hopkinson torsional bar (SHTB) is introduced to eliminate the effect of the loading reverberation of the standard SHTB on the study of evolution of shear localization. The effect, the cause and the method by which to eliminate loading wave reverberation are carefully analysed and discussed. By means of the modified apparatus, the post-mortem observation of tested specimens can provide data on actual evolution of micro-structure and micro-damage during shear localization. Some test results of shear banding conducted with this apparatus support the use of the modified design. Moreover, the modification makes possible the correlation of evolving micro-structures to the transient shear stress-strain recording.

Fatigue fracture-behavior of carbon-fiber-reinforced modified bismaleimide composites

The fracture toughness and fatigue fracture behaviour of carbon-fiber-reinforced modified bismaleimide (BMI) composites have been studied. These composites were found to have higher fracture toughnes, better damage tolerance and longer fatigue life than carbon-fiber composites with epoxy matrices. Delamination is the major mode of failure in fatigue and it is controlled by the properties of the matrix and interface. The improved performance is dire to the presence of thermoplastic particles in the modified BMI matrix which gives rise to enhanced fiber/matrix adhesion and more extensive plastic deformation. The fatigue behaviour also depends on the stacking sequence, with the multidirectional [45/90/-45/0] fiber-reinforced modified BMI composite having a lower crack propagation rate and longer fatigue life than the unidirectional laminate. This arises because of the constraint on the damage processes due to the different fiber orientation in the plies.

Proposal for improving fishing opportunities off Pt. Loma by construction of an artificial reef

(Document pdf contains 42 pages)

Como vota o Partido dos Trabalhadores (PT) na Câmara dos Deputados enquanto oposição e enquanto governo

Objetiva verificar se o Partido dos Trabalhadores - (PT) manteve ou não sua coerência programática e ideológica enquanto oposição e enquanto governo em votações das reformas da previdência realizadas na Câmara dos Deputados. Para isso foram analisadas as PECs n.° 33/1995 e n.° 40/2003, o conceito de seguridade social, previdência social, a criação e formação ideológica do PT. Foram estudados a votação das PECs e como PT votou em cada uma delas, e finalmente, conclui este estudo descrevendo o conteúdo analisado e discorrendo sobre as descobertas desse questionamento.

Fundação do PMDB e PT no Distrito Federal: redemocratização e formação dos diretórios

Analisa o processo de organização dos diretórios regionais do Partido do Movimento Democrático Brasileiro (PMDB) e do Partido dos Trabalhadores (PT) no Distrito Federal (DF). Analisa também o movimento pela autonomia política do DF e inclui pesquisa com filiados para levantar informações de caráter socioeconômico e político. As pesquisas documentais, consultas à literatura e entrevistas demonstram que a atividade político-partidária ocorreu no DF, apesar das proibições vigentes ao longo da década de 1970 até meados da década de 1980. Inicialmente, as atividades eram realizadas sob a coordenação de entidades de caráter suprapartidário. O trabalho apresenta ainda a evolução histórica do pensamento político e do conceito de democracia. Desde Sócrates, Platão e Aristóteles até luminares da teoria política, como Maquiavel, Hobbes, Locke, Montesquieu e Rousseau. Um relato histórico mostra também como surgiram as primeiras agremiações partidárias em países como a Inglaterra, França, Alemanha e Itália e também nos Estados Unidos. Outra parte apresenta a evolução da vida partidária no Brasil ao longo dos anos.

Unlike Physical Exercise, Modified Environment Increases the Lifespan of SOD1(G93A) Mice However Both Conditions Induce Cellular Changes

8 p.

MBARI procedures for automated nutrient analyses using a modified Alpkem Series 300 Rapid Flow Analyzer

This report documents the methods used at the Monterey Bay Aquarium Research Institute (MBARI) for analyzing seawater nutrient samples with an Alpkem Series 300 Rapid Flow Analyzer (RFA) system. The methods have been optimized for the particular requirements of this laboratory. The RFA system has been used to analyze approximately 20,000 samples during the past two years. The methods have been optimized to run nutrient analyses in a routine manner with a detection limit of better than -±1% and a within run precision of -±1% of the full scale concentration range. The normal concentration ranges are 0-200 ~M silicate, 0-5 ~M phosphate, 0-50 ~M nitrate, 0-3 ~M nitrite, and 0-10 ~M ammonium. The memorandum is designed to be used in a loose-leaf binder format. Each page is dated and as revisions are made, they should be inserted into the binder. The revisions should be added into the binder. Retain the old versions in order to maintain a historical record of the procedures. (88 pages)

Modified Simplified Rate Equation Model of Flowing Chemical Oxygen-Iodine Laser and its Application

A modified simplified rate equation (RE) model of flowing chemical oxygen-iodine laser (COIL), which is adapted to both the condition of homogeneous broadening and inhomogeneous broadening being of importance and the condition of inhomogeneous broadening being predominant, is presented for performance analyses of a COIL. By using the Voigt profile function and the gain-equal-loss approximation, a gain expression has been deduced from the rate equations of upper and lower level laser species. This gain expression is adapted to the conditions of very low gas pressure up to quite high pressure and can deal with the condition of lasing frequency being not equal to the central one of spectral profile. The expressions of output power and extraction efficiency in a flowing COIL can be obtained by solving the coupling equations of the deduced gain expression and the energy equation which expresses the complete transformation of the energy stored in singlet delta state oxygen into laser energy. By using these expressions, the RotoCOIL experiment is simulated, and obtained results agree well with experiment data. Effects of various adjustable parameters on the performances of COIL are also presented.

Considerações sobre os relatórios : avaliação de receitas e despesas do 4º bimestre : cumprimento de metas do 2º quadrimestre de 2013 : Decreto nº 8.111/2013 (30 de setembro)

Consultoria de Orçamento e Fiscalização Financeira. Núcleo de Assuntos Econômico-Fiscais

Black Holes, Cosmological Solutions, Future Singularities, and Their Thermodynamical Properties in Modified Gravity Theorie

54 p.