Materials Literature
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Abstract : Energetic materials are studied as isolated species to learn the kinetics and dynamics of their unimolecular behavior. The behavior of these species is then compared with that of very similar model systems in order to enable the synthesis of new materials that will be energetic by design. This must be the f…
La formacion de los peroxidos de uranilo (studtita y metastudtita) como producto de alteracion del combustible nuclear gastado, en un almacen, estara determinada por la generacion de productos radioliticos oxidantes como el H2O2. La precipitacion de studtita en la superficie del combustible podria tener un efecto prot…
Solid solution effects on the strength of the finest nanocrystalline grain\nsizes are studied with molecular dynamics simulations of different Cu-based\nalloys. We find evidence of both solid solution strengthening and softening,\nwith trends in strength controlled by how alloying affects the elastic modulus\nof the m…
Molecular dynamics simulations are used to investigate strain localization in\na model nanocrystalline metal. The atomic mechanisms of such catastrophic\nfailure are first studied for two grain sizes of interest. Detailed analysis\nshows that the formation of a strain path across the sample width is crucial,\nand can…
A previous method for directly calculating the spatial distribution of energy deposition into damage or ionization for ions implanted into solid targets is extended to account for the energy transport by recoiling target atoms. The new calculations extend the applicability of the method to lower incident ion energies.…
Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.
A new superconductor (Na0.25K0.45)Ba3Bi4O12, having an A-site-ordered double perovskite structure, with a maximum Tc ~ 27 K has very recently been discovered through hydrothermal synthesis at 593 K. The structural, elastic, electronic, and thermal properties of the new synthesized compound have been investigated theor…
Once the overall test plan has been agreed upon (by approval of the project technical plan), the construction plans for the test article can proceed. Control of specific te sts described by the overall plan is exercised by individual test procedures. Many of these are standardized tests, such as those published by the…
E = a E t + (1 - a)E2 (6.2) where a is the percentage of volume of film 1 in the composite film, and (1 — a) is the percentage of volume of film 2. From the same surface area of films 1 and 2, a is substituted with dx and d2.
Resolved by the House of Representatives (the Senate concurring), That it is the sense of the Congress that the following Code of Ethics should be adhered to by all Government employees, including officeholders: 1. Put loyalty to the highest moral principles and to country above loyalty to persons, party, or Governmen…
If the strength of ceramics were determined solely by the stress necessary to separate planes of atoms, one would expect ceramics to be very strong. However, high strength is observed infrequently and only in special materials (Kelly, 1966). In almost all cases, ceramics are weaker than otherwise expected because flaw…
A pumping test will be conducted in a confined aquifer in a coastal valley. The aquifer and overlying strata extend under a nearby bay. For several days prior to the test, tidal levels and depth to water in a test well are recorded, with the results plotted in Figure 3.4. From the slope of a straight line fitted throu…
The function W(t5, J3, c, cr, d/m, 1/m, do/m, /ofm) defined in Equation 21.8 is a function of seven dimensionless parameters. If the aquifer thickness and screen locations of all wells are known, the unknown parameters are t5, J3, c, and cr. To proceed it is necessary to assume the value of two of the following ratios…
The first x-ray structure determination of a serpin was of a reactive-site-modified form of the normal (M variant) human alpha 1-antitrypsin (alAT*), also called alpha 1-proteinase inhibitor (1). After cleavage at the reactive site Met358Ser359 by chymotrypsinogen A, alAT* formed crystals that diffracted to a resoluti…
The occurrence of natural radionuclides in drinking water has been the \nsubject of extensive study since 1976, when the U.S. Environmental Protection \nAgency (U.S. EPA) established drinking water standards for gross alpha and \nradium (Ra). Most of these studies have focused on "hot spots" of 226Ra and/ \nor 228Ra f…
Industrial boilers and their emission control systems produce a variety of residues. By far, the largest quantity is bottom ash, the unburned and nonburnable materials that drop from the bottom of the combustor at the end of the burning cycle.
As was pointed out in Prop. 3.5.2., the opposite c o n ta in m e n t to f~^(OA) c 0 ( f _^(A)) a lways holds. Following th e insight of Joya l ([JT]), we can now, as did Ghilardi and Meloni, define the notion of an etale Q-category.
In some instances, the term asphalt is used instead of the term bitumen (Gruse and Stevens, 1960). In other instances, the term asphalt is used to indicate the natural or mechanical mixture of the organic binder having a considerable proportion of mineral matter present (Broome, 1973; Broome and Wadelin, 1973). In thi…
The governing equation is derived by combining Darcy&s;s Law for flow in the aquifer and aquitard with the principle of conservation of mass in a radial coordinate system (Han tush, 1964) (12.1) where ~. Kz, and S are the aquifer horizontal and vertical hydraulic conductivities and storativity, respectively, sis drawd…
Th e first fabric filter system that was commercially sold for use on an industrial boiler was sold in 1973 and went into commercial operation in 1974 at a chemical plant in West Virginia. The installation consisted of four independent systems. It was a perfect example of the design of air pol lution control equipmen…