Assessments performance

The performance of an adhesive needs to be assessed for three principal reasons To see if it is suitable - both in production and in service  

This again makes the selection procedure of Section 5.2.1 appropriate for the first assessment. 

The following three useful, simple and practical rules will assist the final identification of individual adhesives  

Choose an adhesive with high shear strength  

Check that peel and impact strengths of the adhesive are adequate Confirm that the environmental conditions will not cause an unacceptable loss of performance in service. 

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Performance assessments are predictions of radioactivity releases, the rate of transfer of contaminants through various media, and the potential for hazard to the pubHc. These are based on a combination of experimental data obtained in the process called site characterization and detaded computations about radionuchdes and their effects. The progressive attack on the metal or ceramic waste container, the diffusion of water into the waste form, the leaching of the radioactive compounds, diffusion out, and washing away of radionuchdes are all considered. 

Models for transport distinguish between the unsaturated zone and the saturated zone, that below the water table. There the underground water moves slowly through the sod or rock according to porosity and gradient, or the extent of fractures. A retardation effect slows the motion of contaminant by large factors in the case of heavy metals. For low level waste, a variety of dose calculations are made for direct and indirect human body uptake of water. Performance assessment methodology is described in Reference 22. 

Site characterization studies include a surface-based testing program, potential environmental impact, and societal aspects of the repository. Performance assessment considers both the engineered barriers and the geologic environment. Among features being studied are the normal water flow, some release of carbon-14, and abnormal events such as volcanic activity and human intmsion. The expected date for operation of the repository is 2013. 

Performance assessment of innovative HVAC systems, facades, and glazings... 

For integral building design and performance assessments (thermal comfort, indoor air quality, visual comfort), either integrated building simulation tools must be used or the thermal building simulation must be complemented by airflow and daylighting simulations. 

The purpose of the simulation is defined precisely and accurately (what do we want to know ). Parameters and requirements are specified for the performance assessment. 

Thompson KL et al (2005) Use of a mixed tissue RNA design for performance assessments on multiple micro-array formats. Nucleic Acids Res 33 el 87... 

Bader, F. P., and Tucker, T. W., Real-time data compression improves plant performance assessment. InTech. 34, 53-56 (1987b). 

Smellie JAT, Stuckless JS (1985) Element mobility studies of two drill-cores from the Gotemar granite (Krakemala test site), southeast Sweden. Chem Geol 51 55-78 Smellie JAT, Karlsson F, Alexander WR (1997) Natural analogue studies present status and performance assessment implications. J Contam Hydrol 26 3-17... 

Ho, C.K., Arnold, B.W., Cochran J.R., and Taria, R.Y., Development of a Risk-Based Probabilistic Performance-Assessment Method for Long-Term Cover Systems, 2nd ed., Sandia National Laboratories Report SAND2002-3131, 2002. 

A second major public concern is over nuclear wastes. Most experts believe that it is possible to dispose of these in a manner that poses little threat to the environment and human health, given the small volume of the spent fuel, the decay with time of the radionuclides, and the potential effectiveness of engineered and natural barriers. The success that is likely to be achieved is examined through Total System Performance Assessments (TSPA) (see, e.g, OCWRM, 1998). 

OCWRM, 1998. Viabilily Assessment of a Repository at YuccaMountain, Volume 3 Total System Performance Assessment, DOE/RW-0508/V3, U.S. Department of Energy, Office ofCivilian Radioactive Waste Management, North Las Vegas. 

The greatest need in model performance testing and validation is clearly the use of quantitative measures to describe comparisons of observed and predicted values. As noted above, although a rigorous statistical theory for model performance assessments has yet to be developed, a variety of statistical measures has been used in various combinations and the frequency of use has been increasing in recent years. The FAT workshop (3.) identified three general types of comparisons that are often made in model performance testing ... 

European network of analytical chemistry laboratories Food Analysis Performance Assessment Scheme Food and Drug Administration (USA) gas chromatography... 

I.-Y. Son, M. Guhe, W. Gray, B. Yazici, and M. J. Schoelles. Human performance assessment using fnir. In Proceedings of SPIE, 2005. 

Probabibstic fatigue behavior, 13 494 Probabibstic performance assessment, 17 548... 

Petit, J.C. (1992). Natural analogs for the design and performance assessment of radioactive-waste forms - a review. Journal of Geochemical Exploration 46 1-33. 

Estimates of service life are usually made either by natural or simulated trials or, most commonly, by accelerated tests with extrapolation to predict performance at longer times under less severe conditions. An alternative approach is to subject the product to environmental exposures which equate to the whole design life, and then to assess performance by real or simulated service tests (the end performance assessment). The exposures usually have to involve accelerated procedures and can be composed of several environmental agents applied simultaneously or sequentially. 

L.R. Waterland, S. Venkatesh, S. Unnasch, Safety and Performance Assessment of Ethanol/ Diesel Blends (E- Diesel), NREL Report SR-540-34817 Sept,... 

Two UK proficiency testing schemes are the Food Analysis Performance Assessment Scheme (PAPAS), which replaced NAMAS in 2000, which is arranged by the Central Science Laboratory, with details at http //ptg.csl.gov.uk/fapas.cfm... 

PAPAS Food Analysis Performance Assessment Scheme... 

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