Applications of Scaling Models and the Weibull Stress to the Determination of Structural Performance-Based Material Screening Criteria

2008 ◽  
pp. 209-209-22
Author(s):  
SM Graham ◽  
J Mercier
Keyword(s):  
Structural Performance ◽  
Screening Criteria ◽  
Scaling Models ◽  
Material Screening ◽  
Weibull Stress

Analysis of Wave Energy Sources in the North Atlantic Waters in View of Design Challenges

2016 ◽  
Author(s):  
Jose V. Taboada ◽  
Hirpa G. Lemu
Keyword(s):  
Renewable Energy ◽  
North Atlantic ◽  
Wave Energy ◽  
Energy Resources ◽  
Structural Performance ◽  
Energy Sources ◽  
Wave Power ◽  
Wave Statistics ◽  
Wave Characteristics

This paper describes a wave energy analysis of North Atlantic waters and provides an overview of the available resources. The analysis was conducted using a scatter diagram data combined with wave statistics and empirical parameters given by wave height and periods. Such an overview is instrumental for modelling of wave energy sources, design of wave energy converter (WEC) devices and determination of locations of the devices. Previous survey of wave energy resources widely focused on determination of the reliability on installations of WECs. Though the renewable energy source that can be utilized from the waves is huge, the innovative work in design and development of WECs is insignificant and the available technologies still require further optimization. Furthermore, the wave potential of North Atlantic waters is not sufficiently studied and documented. Closer review of the literature also shows that wave energy conversion technology, compared with other conversion machines of renewable energy sources such as wind energy and solar energy, seems still immature and most of the research and development efforts in this direction are limited in scope. The design of energy converters is also highly dictated by the wave energy resource intensity distribution, which varies from North to South hemisphere. The immaturity of the technology can be attributed to several factors. Since there are a number of uncertainties on the accuracy of wave data, the design, location and installation of WECs face a number of challenges in terms of their service life, structural performance and topological configuration. As a result, collection and assessment of wave characteristics and the wave state conditions data serve as key inputs for development of robust, reliable, operable and affordable wave energy converters. The fact that a number of variables are involved in wave distribution characteristics and the extraction of wave power, treating these variables in the design process imposes immense challenges for the design optimization and hence the optimum energy conversion. The conversion machines are expected to extract as high wave energy as possible while their structural performance is ensured. The study reported in this paper is to analyse wave data over several years of return periods with a detailed validation for wave statistics and wave power. The analysis is intended to contribute in better understanding of the wave characteristics with influencing parameters that can serve as design optimization parameters. A method is proposed to conduct a survey and analysis of the available wave energy resources and the potential at cited locations. The paper concludes that wave energy data accuracy is the baseline for project scoping, coastal and offshore design, and environmental impact assessments.

scholarly journals Determination of regional screening criteria for retinopathy ofprematurity in the Eastern Black Sea region of Turkey

2016 ◽  
Vol 46 ◽  
pp. 381-387 ◽  
Author(s):  
Mehmet KOLA ◽  
Dilek HACIOĞLU ◽  
Hidayet ERDÖL ◽  
Adem TÜRK ◽  
Yakup ASLAN
Keyword(s):  
Black Sea ◽  
Screening Criteria ◽  
Black Sea Region

scholarly journals NONPARAMETRIC DETERMINATION OF REDSHIFT EVOLUTION INDEX OF DARK ENERGY

2007 ◽  
Vol 22 (21) ◽  
pp. 1569-1580 ◽  
Author(s):  
HOURI ZIAEEPOUR
Keyword(s):  
Dark Energy ◽  
Cosmological Constant ◽  
Cosmological Parameters ◽  
Positive Energy ◽  
Fundamental Constants ◽  
Geometrical Properties ◽  
Precise Data ◽  
Energy Models ◽  
Scaling Models

We propose a nonparametric method to determine the sign of γ — the redshift evolution index of dark energy. This is important for distinguishing between positive energy models, a cosmological constant, and what is generally called ghost models. Our method is based on geometrical properties and is more tolerant to uncertainties of other cosmological parameters than fitting methods in what concerns the sign of γ. The same parametrization can also be used for determining γ and its redshift dependence by fitting. We apply this method to SNLS supernovae and to gold sample of re-analyzed supernovae data from Riess et al. Both datasets show strong indication of a negative γ. If this result is confirmed by more extended and precise data, many of the dark energy models, including simple cosmological constant, standard quintessence models without interaction between quintessence scalar field(s) and matter, and scaling models are ruled out. We have also applied this method to Gurzadyan–Xue models with varying fundamental constants to demonstrate the possibility of using it to test other cosmologies.

A note on the determination of configuration and weights for a class of individual scaling models

Psychometrika ◽  
1985 ◽  
Vol 50 (4) ◽  
pp. 539-542
Author(s):  
Vina Vani ◽  
M. Raghavachari
Keyword(s):  
Scaling Models

Inadequate Immunizations

1993 ◽  
Vol 32 (3) ◽  
pp. 156-160 ◽  
Author(s):  
Terri J. Hymel ◽  
Joseph Sherman ◽  
Sandra K. Pope ◽  
Kelly J. Kelleher
Keyword(s):  
Social History ◽  
Cost Effective ◽  
Chronic Illnesses ◽  
Screening Criteria ◽  
Immunization Status ◽  
Specific Factors ◽  
Limited Health ◽  
A Prospective Study ◽  
Retrospective Examination

Immunizations are cost-effective measures for assuring public health. However, recent outbreaks of measles, mumps, and pertussis underscore the inadequacy of current immunization programs. A model identifying those children who are likely to be inadequately immunized could focus the use of limited health funds. A retrospective examination of the medical charts of 101 children in a large inner-city clinic was undertaken to determine if specific factors were associated with inadequate immunization status. Fifty percent of the children were inadequately immunized by 18 months of age (no measles-mumps-rubella or fewer than three diphtheria-pertussis-tetanus vaccinations). Logistic regression analyses showed that older maternal age, no recurrent or chronic illnesses, and vaginal delivery were independently associated with inadequate immunization status. However, on many charts, information on maternal, social, and environmental variables was incomplete. The increasing use of structured medical charts will enhance data collection and the determination of an appropriate index. A prospective study of the variables identified, along with standardization of medical records and inclusion of social history data, is necessary to further investigate the utility of screening criteria for inadequate immunizations.

Sparse Plate-Trusses

1998 ◽  
Vol 13 (3) ◽  
pp. 113-125
Author(s):  
Livna Alpar-Engelhardt ◽  
Oren Vilnay
Keyword(s):  
Structural Properties ◽  
Structural Performance ◽  
Stiffness Coefficient ◽  
Quick Method ◽  
Structural Efficiency ◽  
Stiffness Coefficients

Strategies of reducing the number of bars of a sparse plate-truss, while increasing structural height and improving structural performance are considered. Four strategies are presented by considering seven plate-trusses. The morphological and structural properties of each of the plate trusses with reduced number of bars are discussed. An approximate and quick method to find the stiffness coefficients of a periodic unit of the plate-truss is presented and an equivalent single stiffness coefficient is introduced. The stiffness coefficients enable the designer to understand the existing relationship between the morphology of a truss and its structural ability. They are very useful for a comparison of structural ability of different sparse-trusses and permit a determination of the relative structural efficiency of each strategy of reducing the bar density.

Neopterin in Bone Banking

Pteridines ◽  
1998 ◽  
Vol 9 (4) ◽  
pp. 192-195
Author(s):  
K. M. Peters ◽  
B. Klosterhalfen
Keyword(s):  
Immune Response ◽  
Blood Transfusion ◽  
Antibody Test ◽  
Bone Infection ◽  
Normal Range ◽  
Screening Criteria ◽  
Bone Banking ◽  
Negative Results ◽  
Hiv Test

Summary Not only in blood transfusion, but also in transplantation of allogenous bone, infection of patients with bacteria and especially with virus is possible. Neopterin as an unspecific marker of an activated cellmediated immune response is elevated in fresh viral infection even before antibodies are detectable. Additional determination of neopterin in bone banking can further reduce the already little risk of a still antibody-negative HIV infection in a spongiosa donor. If a first HIV-antibody test is negative and serum neopterin lies within normal range, a second HIV-test six months after operation, which is otherwise obligatory in bone banking today, can be cancelled and the allograft can be given free for transplantation assuming negative results obtained by other screening criteria.

Effect of Structural Performance of Bridge Based on Fatigue S-N Curves

2014 ◽  
Vol 536-537 ◽  
pp. 1603-1606
Author(s):  
Xiao Hui Xia
Keyword(s):  
Experimental Data ◽  
Fatigue Life ◽  
Reliability Theory ◽  
Structural Performance ◽  
Basic Material ◽  
Fatigue Reliability ◽  
Analysis And Design ◽  
Material Fatigue ◽  
Theoretical Significance

The probability of S-N curve is one of the basic material fatigue reliability analysis and design. Determination of S-N curve is the basis of the fatigue life of obedience lognormal based on the application of statistical methods to fit the experimental data obtained fatigue. This paper studies the construction of reinforced Fatigue S-N Curves overloading effect on the structural performance of the bridge. In this paper, the fatigue reliability theory as a useful supplement, has some theoretical significance and value of work.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

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