988 resultados para representative design,


Relevância:

30.00% 30.00%

Publicador:

Resumo:

The Great Barrier Reef Marine Park, an area almost the size , of Japan, has a new network of no-take areas that significantly improves the protection of biodiversity. The new marine park zoning implements, in a quantitative manner, many of the theoretical design principles discussed in the literature. For example, the new network of no-take areas has at least 20% protection per bioregion, minimum levels of protection for all known habitats and special or unique features, and minimum sizes for no-take areas of at least 10 or 20 kat across at the smallest diameter Overall, more than 33% of the Great Barrier Reef Marine Park is now in no-take areas (previously 4.5%). The steps taken leading to this outcome were to clarify to the interested public why the existing level of protection wets inadequate; detail the conservation objectives of establishing new no-take areas; work with relevant and independent experts to define, and contribute to, the best scientific process to deliver on the objectives; describe the biodiversity (e.g., map bioregions); define operational principles needed to achieve the objectives; invite community input on all of The above; gather and layer the data gathered in round-table discussions; report the degree of achievement of principles for various options of no-take areas; and determine how to address negative impacts. Some of the key success factors in this case have global relevance and include focusing initial communication on the problem to be addressed; applying the precautionary principle; using independent experts; facilitating input to decision making; conducting extensive and participatory consultation; having an existing marine park that encompassed much of the ecosystem; having legislative power under federal law; developing high-level support; ensuring agency Priority and ownership; and being able to address the issue of displaced fishers.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Product reliability and its environmental performance have become critical elements within a product's specification and design. To obtain a high level of confidence in the reliability of the design it is customary to test the design under realistic conditions in a laboratory. The objective of the work is to examine the feasibility of designing mechanical test rigs which exhibit prescribed dynamical characteristics. The design is then attached to the rig and excitation is applied to the rig, which then transmits representative vibration levels into the product. The philosophical considerations made at the outset of the project are discussed as they form the basis for the resulting design methodologies. It is attempted to directly identify the parameters of a test rig from the spatial model derived during the system identification process. It is shown to be impossible to identify a feasible test rig design using this technique. A finite dimensional optimal design methodology is developed which identifies the parameters of a discrete spring/mass system which is dynamically similar to a point coordinate on a continuous structure. This design methodology is incorporated within another procedure which derives a structure comprising a continuous element and a discrete system. This methodology is used to obtain point coordinate similarity for two planes of motion, which is validated by experimental tests. A limitation of this approach is that it is impossible to achieve multi-coordinate similarity due to an interaction of the discrete system and the continuous element at points away from the coordinate of interest. During the work the importance of the continuous element is highlighted and a design methodology is developed for continuous structures. The design methodology is based upon distributed parameter optimal design techniques and allows an initial poor design estimate to be moved in a feasible direction towards an acceptable design solution. Cumulative damage theory is used to provide a quantitative method of assessing the quality of dynamic similarity. It is shown that the combination of modal analysis techniques and cumulative damage theory provides a feasible design synthesis methodology for representative test rigs.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

This research project is concerned with the design, synthesis and development of new phosphodiesterase 5 (PDE5) inhibitors with improved selectivities and lower toxicities. Two series of a 5 member and a 6 member ring fused heterocyclic compounds were designed, and synthesized. By alteration of starting materials and fragments, two virtual libraries, each is consisted of close to hundred compounds, were obtained successfully. The screening of sexual stimulation activity with rabbits demonstrated both groups of compounds were able to stimulate rabbit penile erection significantly. The following toxicity studies revealed 2-(substituted-sulfonylphenyl)-imidazo [1,5-a]-1,3,5-triazine-4-(3H)-one group possessed an unacceptable toxicity with oral LD50 about 200mg/kg; while 2-(substituted-sulfonylphenyl)-pyrrolo[2,3-d]pyrimidin-4-one group showed an acceptable toxicity with oral LD50 over 2000mg/kg. The continued bioactivity studies showed yonkenafil, the representative of 2-(substituted-sulfonylphenyl)-pyrrolo[2,3-d]pyrimidin-4-one group, has a better selectivity towards PDE5 and PDE6 than sildenafil and a better overall profile of sexual stimulation on animals than sildenafil. Chronic toxicity studies of yonkenafil further confirmed yonkenafil did not cause any serious side effect and damage on animal models and most actions were explainable. Based on evidences of the above studies, yonkenafil were recommended to enter clinical trials by the regulation authority of China, SFDA. Currently yonkenafil has been through the Phase I clinical trials and ready to progress into Phase II. Hopefully, yonkenafil will provide an alternative to the ED patients in the future.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Background: Obesity, a growing epidemic, is a preventable risk factor for cardiometabolic diseases. Obesity and cardiometabolic diseases affect Hispanics and African Americans more than non-Hispanic Caucasians. This study examined the relationship among race/ethnicity, obesity diagnostic measures (body mass index, waist circumference, subscapular and triceps skinfold thickness), and cardiometabolic risk factors (hyperglycemia, high, non-high-density lipoprotein cholesterol, low, high-density lipoprotein cholesterol, and hypertension) for adults across the United States. Methods: Using data from two-cycles of the National Health and Examination Survey (NHANES) 2007-2010, and accounting for the complex sample design, logistic regression models were conducted comparing obesity indicators in Mexican Americans, other Hispanics, and Black non-Hispanics, with White non-Hispanics and their associations with the presence of cardiometabolic diseases. Results: Differences by race/ethnicity were found for subscapular skinfold thickness and hyperglycemia. Waist circumference and subscapular skinfold were positively associated with the presence of hyperglycemia; dyslipidemia, and hypertension across race/ ethnicity, adjusting for age, gender, smoking, physical activity, education, income to poverty index, and health insurance. Race/ ethnicity did not influence the association of any obesity indicators with the tested cardiometabolic diseases. All obesity measures except triceps skinfold were associated with hyperglycemia. Conclusions: We suggest that subscapular skinfold thickness be considered as an inexpensive non-intrusive screening tool for cardiometabolic risk factors in an adult US population

Relevância:

30.00% 30.00%

Publicador:

Resumo:

The importance of political parties for contemporary representative democracies is beyond dispute. Despite their significance for state-level democracy, political parties continue to be regarded as oligarchical and to be criticised because of their internal practices. For this reason, intra-party democracy (IPD) warrants in-depth analysis. This thesis investigates IPD in Turkey, primarily from the perspective of participatory democracy, with the purpose of suggesting reforms to the Turkish Political Parties Law (TPPL). Turkish political parties and Turkish party regulation provide an interesting case because there is a significant difference between mature democracies and Turkey regarding IPD regulation. IPD in established democracies has always been regarded as a private concern of parties and has been left unregulated. IPD in Turkey, by contrast, is provided for both by the constitution and the TPPL. Although IPD is a constitutional and legal requirement in Turkey, however, political parties in fact display a high level of non-democratic administration. The main reason is that the TPPL only pays lip service to the idea of IPD and requires no specific measures apart from establishing a party congress with a representative form of democracy. By establishing and holding party congresses, political parties are perceived as conforming to the requirements of IPD under the law. In addition, the contested nature of democracy as a concept has impeded the creation of efficacious legal principles. Thus, the existing party law fails to tackle the lack of IPD within political parties and, for this reason, is in need of reform. Furthermore, almost every Turkish party’s own constitution highlights the importance of IPD and promises IPD. However, these declared commitments to IPD in their constitutions alone, especially in countries where the democratic culture is weak, are unlikely to make much difference in practice. Accordingly, external regulation is necessary to ensure the protection of the rights and interests of the party members with regards to their participation in intra-party decision-making processes. Nevertheless, in spite of a general consensus in favour of reforming the TPPL, a lack of consensus exists as to what kind of reforms should be adopted. This thesis proposes that reforming the TPPL in line with an approach based on participatory democracy could provide better IPD within Turkish political parties, citing as evidence comparative case studies of the participatory practices for policy-making, leadership selection and candidate selection in mature democracies. This thesis also analyses membership registration and the effect of state funding on IPD, which are highly problematic in Turkey and represent impediments to the flourishing of IPD.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

A presente investigação identifica o caminho seguido no estudo que se centrou na durabilidade dos produtos como estratégia para a prevenção/redução dos impactes ambientais provocados pela excessiva produção e consumo das sociedades ocidentais. O trabalho baseou-se primeiramente na reunião de argumentos que justificassem a necessidade da investigação. A partir dos conhecimentos obtidos sobre as consequências do descarte prematuro de produtos, incluindo a produção de resíduos e utilização de recursos naturais, a investigação foi direcionada para as estratégias que motivam a redução do consumo pelo aumento da vida útil do produto. A durabilidade de alguns produtos designados de Clássicos do Design motivou o desenvolvimento da investigação. Depois de definido o universo que se enquadra nesta categoria, foi selecionada uma amostra que se considerou representativa e criou-se uma base de dados onde se sistematizou os conteúdos relevantes a conhecer. Através da análise qualitativa e quantitativa da amostra desses produtos, obteve-se uma matriz operativa composta por 10 princípios que pode ser introduzida no processo de design de novos produtos para aquisição de um tempo de vida útil inicial potencialmente maior. Os resultados da aplicação prática da estratégia desenvolvida, a tese, determinarão no futuro a conceção e produção de artefactos que se pretende apresentar à indústria nacional.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Dissertação de Doutoramento para obtenção do grau de Doutor em Design, dissertação apresentada na Universidade de Lisboa - Faculdade de Arquitetura.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

This document presents an Enterprise Application Integration based proposal for research outcomes and technological information management. The proposal addresses national and international science and research outcomes information management, and corresponding information systems. Information systems interoperability problems, approaches, technologies and integration tools are presented and applied to the research outcomes information management case. A business and technological perspective is provided, including the conceptual analysis and modelling, an integration solution based in a Domain-Specific Language (DSL) and the integration platform to execute the proposed solution. For illustrative purposes, the role and information system needs of a research unit is assumed as the representative case.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Students may need explicit training in informal statistical reasoning in order to design experiments or use formal statistical tests effectively. By using scientific scandals and media misinterpretation, we can explore the need for good experimental design in an informal way. This article describes the use of a paper that reviews the measles mumps rubella vaccine and autism controversy in the UK to illustrate a number of threshold concepts underlying good study design and interpretation of scientific evidence. These include the necessity of sufficient sample size, representative and random sampling, appropriate controls and inferring causation.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Shearing is the process where sheet metal is mechanically cut between two tools. Various shearing technologies are commonly used in the sheet metal industry, for example, in cut to length lines, slitting lines, end cropping etc. Shearing has speed and cost advantages over competing cutting methods like laser and plasma cutting, but involves large forces on the equipment and large strains in the sheet material. The constant development of sheet metals toward higher strength and formability leads to increased forces on the shearing equipment and tools. Shearing of new sheet materials imply new suitable shearing parameters. Investigations of the shearing parameters through live tests in the production are expensive and separate experiments are time consuming and requires specialized equipment. Studies involving a large number of parameters and coupled effects are therefore preferably performed by finite element based simulations. Accurate experimental data is still a prerequisite to validate such simulations. There is, however, a shortage of accurate experimental data to validate such simulations. In industrial shearing processes, measured forces are always larger than the actual forces acting on the sheet, due to friction losses. Shearing also generates a force that attempts to separate the two tools with changed shearing conditions through increased clearance between the tools as result. Tool clearance is also the most common shearing parameter to adjust, depending on material grade and sheet thickness, to moderate the required force and to control the final sheared edge geometry. In this work, an experimental procedure that provides a stable tool clearance together with accurate measurements of tool forces and tool displacements, was designed, built and evaluated. Important shearing parameters and demands on the experimental set-up were identified in a sensitivity analysis performed with finite element simulations under the assumption of plane strain. With respect to large tool clearance stability and accurate force measurements, a symmetric experiment with two simultaneous shears and internal balancing of forces attempting to separate the tools was constructed. Steel sheets of different strength levels were sheared using the above mentioned experimental set-up, with various tool clearances, sheet clamping and rake angles. Results showed that tool penetration before fracture decreased with increased material strength. When one side of the sheet was left unclamped and free to move, the required shearing force decreased but instead the force attempting to separate the two tools increased. Further, the maximum shearing force decreased and the rollover increased with increased tool clearance. Digital image correlation was applied to measure strains on the sheet surface. The obtained strain fields, together with a material model, were used to compute the stress state in the sheet. A comparison, up to crack initiation, of these experimental results with corresponding results from finite element simulations in three dimensions and at a plane strain approximation showed that effective strains on the surface are representative also for the bulk material. A simple model was successfully applied to calculate the tool forces in shearing with angled tools from forces measured with parallel tools. These results suggest that, with respect to tool forces, a plane strain approximation is valid also at angled tools, at least for small rake angles. In general terms, this study provide a stable symmetric experimental set-up with internal balancing of lateral forces, for accurate measurements of tool forces, tool displacements, and sheet deformations, to study the effects of important shearing parameters. The results give further insight to the strain and stress conditions at crack initiation during shearing, and can also be used to validate models of the shearing process.