Within the context of eikonal scattering theory, a generalized optical model potential approximation to the nucleus-nucleus multiple scattering series is used in an abrasion-ablation collision model to predict abrasion cross sections for relativistic proj...

Using an abrasion-ablation collision model, which includes contributions from frictional-spectator interactions and electromagnetic dissociation, analyses of the sensitivities of predicted fragmentation cross sections to the choice of a particular abrasion formalism are made using both geometric and optical ...

Second order optical model solutions to the elastic scattering amplitude were used to evaluate total, absorption, and abrasion cross sections for neutron nucleus scattering. Improved agreement with experimental data for total and absorption cross sections is found when compared with first order ...

The abrasion-ablation model for reactions between relativistic heavy ions is derived from Glauber's multiple scattering theory. Simple expressions are found for the abrasion cross section and for the excitation energy of the projectile after abrasion. Both quantities depend on ...

An abrasion-ablation T-matrix formulation is applied to the calculation of double differential-cross

Within the context of eikonal scattering theory, a generalized optical model potential approximation to the nucleus-nucleus multiple scattering series is used in an abrasion-ablation collision model to predict abrasion cross sections for relativistic projectile heavy ions. Unlike the optical limit of Glauber ...

... of material removal mechanisms indicates that an ideal tool for shaping of materials is a high energy beam, having infinitely small cross-section, ...

Quantum-mechanical optical model methods for calculating cross sections for the fragmentation of galactic cosmic ray nuclei by hydrogen targets are presented. The fragmentation cross sections are calculated with an abrasion-ablation collision formalism. E...

A process for providing abrasion and corrosion resistance in the borehole of a steel body comprising placing an alloying material of solid form within the borehole of the steel body, the alloying material having abrasion and corrosion resistance, and thereafter melting the alloying material in a gas heated protective gas oven to effect diffusion bonding of ...

The cross sections of the fragments produced in the projectile fragmentation reactions of the even calcium isotopes from A = 36 to A = 52 are calculated using the statistical abrasion ablation model. The neutron skin thickness are studied by investigating the fragments isotopic cross section ...

Measurements of differential cross sections at 0[degree] for projectilelike fragments from [sup 18]O and [sup 40]Ar projectiles at [ital E]/[ital A]=80 MeV are presented and are compared with the predictions of the abrasion-ablation model, the internuclear cascade model, a high-energy empirical parametrization, and a simple cluster ...

A survey of abrasion resistant materials is presented. Sections are included on abrasion-resistant cast steels, abrasion-resistant wrought steels, alloy white irons, composite abrasion-resistant castings, grinding media, and development prospects. (JRD)

... presents Design Considerations for Abrasive Blast Rooms & Recovery Systems by Bob Kerr ... Page 31. ABRASIVE CLEANER Page 32. M-Section ...

The theory of galactic heavy-ion fragmentation is furthered by incorporating a T-matrix approach into the description of the three-step process of abrasion, ablation, and final-state interations. The connection between this T matrix and the interaction potential is derived. For resonant states, the substitution of complex energies for real energies in the transition rate is ...

The cross sections of fragments produced of the six pairs of |T|=2 mirror nuclei projectile fragmentation were calculated using the statistical abrasion-ablation model. The isospin dependence of the projectile fragmentation are studied by investigating the fragments isotopic cross section ...

Quantum mechanical optical model methods for calculating isotope production cross sections from the spallation of heavy nuclei by high-energy protons are developed from a modified abrasion-ablation collision formalism. The abrasion step is treated quantum-mechanically as a knockout process which leaves the residual ...

We study the relation between neutron removal cross section (sigma{sub -N}) and neutron skin thickness for finite neutron-rich nuclei using the statistical abrasion ablation model. Different sizes of neutron skin are obtained by adjusting the diffuseness parameter of neutrons in the Fermi distribution. It is demonstrated that there is ...

...2010-07-01 2010-07-01 false Abrasive blasting. 72.610 Section 72...MINES Miscellaneous § 72.610 Abrasive blasting. (a) Surface and underground mines. When an abrasive blasting operation is...

...2009-07-01 2009-07-01 false Abrasive blasting. 72.610 Section 72...MINES Miscellaneous § 72.610 Abrasive blasting. (a) Surface and underground mines. When an abrasive blasting operation is...

...2010-07-01 2010-07-01 false Abrasive blasting. 58.610 Section 58...MINES Miscellaneous § 58.610 Abrasive blasting. (a) Surface and underground mines. When an abrasive blasting operation is...

...2009-07-01 2009-07-01 false Abrasive blasting. 58.610 Section 58...MINES Miscellaneous § 58.610 Abrasive blasting. (a) Surface and underground mines. When an abrasive blasting operation is...

Quantum mechanical optical potential methods for calculating inclusive isotope and element production cross sections from the fragmenting of heavy nuclei by intermediate- and high-energy protons and heavy ions are presented based upon a modified abrasion-ablation-FSI (frictional spectator interaction) collision model. The ...

Codes used for space radiation shielding studies typically transport light-ions from the incident cosmic ray spectrum using either a one-dimensional straight-ahead approximation or in three dimensions, often without accounting for their breakup. Light-ions are also produced by breakup of energetic heavy ions in target materials. Herein, we present cross ...

The purpose of this in vitro study was to investigate the effect of air abrasion on the interfacial bond between composite and dentin. Dentin surfaces surrounded by enamel were produced by removing the incisal part of the crown from extracted human anterior teeth. The dentinal area of the specimen surfaces was conditioned either by air-abrasion treatment ...

Carbide layer was formed on the surface of Ti by heating in hydrocarbon atmosphere (benzene C6H6) at 1000-1400 degrees C using a high frequency induction heating method. Physical and mechanical properties of carbide-coated Ti were investigated to examine its potential as an abrasion-resistant implant material. Scanning electron microscopy (SEM) showed that the surface of Ti ...

The fragmentation of target nuclei by relativistic protons and heavy ions is described within the context of a simple abrasion-ablation-final-state interaction model. Abrasion is described by a quantum mechanical formalism utilizing an optical model potential approximation. Nuclear charge distributions of the excited prefragments are calculated by both a ...

The relationship between grinding forces and the material`s resistance to microfracture is investigated in abrasive machining of silicon nitride ceramics. Surface grinding is performed on two forms of silicon nitride with different microstructures, and the grinding forces are measured. In addition, single-point scratching is performed on polished surfaces to amplify the damage ...

The mechanism of particle evaporation was used to examine ablation effects in the fragmentation of 2.1 GeV/nucleon oxygen nuclei by lead targets. Following the initial abrasion process, the excited projectile prefragment is assumed to statistically decay in a manner analogous to that of a compound nucleus. The decay probabilities for the various particle emission channels are ...

The mechanism of particle evaporation was used to examine ablation effects in the fragmentation of 2.1 GeV/nucleon oxygen nuclei by lead targets. Following the initial abrasion process, the excited projectile prefragment is assumed to statistically decay in a manner analogous to that of a compound nucleus. The decay probabilities for the various particle emission channels are ...

Production cross sections for the projectile fragmentation of a 1.05A GeV {sup 80}Kr beam on a Be target were measured at the projectile fragment separator FRS at GSI. Cross sections were obtained for isotopes of the elements Ge to Kr close to the proton drip line. These data are compared to the results of the ...

An optical potential abrasion-ablation collision model is used to calculate hadronic dissociation cross sections for one, two, and three nucleon removal for the first time for a 14.6A GeV Si-28 beam fragmenting in aluminum, tin, and lead targets. These estimates are compared with recent semiinclusive measurements. Significant ...

Using a primary beam of 58Ni at 650 MeV/nucleon impinging on a beryllium target, production cross sections of proton-rich fragments from projectile fragmentation have been measured at the projectile-fragment separator FRS at Gesellschaft f�r Schwerionenforschung Darmstadt m.b.H. The experimental data ranging from nickel to scandium for isotopes close to ...

An abrasion-ablation T-matrix formulation is applied to the calculation of double differential-cross sections in projectile fragmentation of 2.1 GeV/nucleon O-16 on Be-9 and 86 MeV/nucleon C-12 on C-12 and Ag-108. An exponential parameterization of the ablation T-matrix is used and the total width of the intermediate states is taken as ...

A generalized optical model heavy ion reaction theory is extended to include correlation effects between projectile and target constituents according to the Pauli exclusion principle. These correlation effects are significant for accurately predicting cross sections for projectile nucleus abrasions, but are relatively unimportant for ...

A semiempirical abrasion-ablation model has been successful in generating a large nuclear database for the study of high charge and energy (HZE) ion beams, radiation physics, and galactic cosmic ray shielding. The cross sections that are generated are compared with measured HZE fragmentation data from various experimental groups. A ...

The cross sections for various reaction products in the interactions of 250 MeV/N and 400 MeV/N carbon ions and alpha particles with calcium are analyzed within the frameworks of Swiatecki's abrasion (fireball) model and Myers' firestreak model. Calculations are compared with experimental results obtained at the ...

Ingot casting was scaled up to 16 cm x 16 cm square cross section size weighting up to 8.1 kg. The high degree of crystallinity was maintained in the large ingot. For large sizes, the non-uniformity of heat treatment caused 'chipping' of the surface of th...

The fragmentation of high-energy galactic heavy ions by nuclear interactions with arbitrary target nuclei is described within the context of a simple abrasion-ablation fragmentation model. The abrasion part of the theory utilizes a quantum-mechanical formalism based upon an optical model potential approximation to the exact nucleus-nucleus ...

We have calculated the cross sections of the fragments produced in the projectile fragmentation of the even 36-52Ca isotopes using the statistical abrasion-ablation model. The isospin effect in the projectile fragmentation are studied by investigating the peak positions and the widths of the fragment isotopic cross ...

The neutron removal cross section [?-N(Z)] is defined for the projectile-like fragment isotopes and extended to the lower Z isotopes in the projectile fragmentation reaction. The cross sections of fragments in 1 A GeV even Ca42-52+C12 projectile fragmentation reactions are calculated using the statistical ...

An optical potential fragmentation model capable of predicting fragmentation cross sections and fragment momentum distributions is used to analyze recent measurements of 1.65[ital A] GeV argon projectiles fragmenting in carbon and potassium-chloride targets obtained with the Heavy Ion Spectrometer System (HISS) at the Lawrence Berkeley Laboratory Bevalac. ...

... CALCULATION OF THE CROSS SECTION OF ELECTRON ... The electron excitation cross sections of the ... approximation used to remove the angular ...

A ball valve assembly is disclosed for controlling the flow of abrasive particulates including an enlarged section at the bore inlet and an enlarged section at the bore outlet. A refractory ceramic annular deflector is positioned in each of the enlarged sections, substantially extending the useful life of the ...

A ball valve assembly for controlling the flow of abrasive particulates including an enlarged section at the bore inlet and an enlarged section at the bore outlet. A refractory ceramic annular deflector is positioned in each of the enlarged sections, substantially extending the useful life of the valve.

...2010-07-01 2010-07-01 false Abrasive wheels. 1915.134 Section 1915...Related Equipment § 1915.134 Abrasive wheels. This section shall apply... (a) Floor stand and bench mounted abrasive wheels used for external...

The abrasion-ablation model is briefly described and then used to calculate cross sections for production of large fragments resulting from target or projectile fragmentation in high-energy heavy-ion collisions. The number of nucleons removed from the colliding nuclei in the abrasion stage and the excitation energy ...

An automatic polisher and techniques for producing scratch-free polished surfuces on pyrolytic graphite specimens in about 15 min after mounting are described. The polisher consists of a two-part polishing well and a stationary cross frame holding bearings. The frame is posltioned so that the weighted mounted specimens are polished by simultaneous rotation against ...

The cross sections for the production of 99 different target fragments from reactions of 8.0 GeV 20Ne with 181Ta and 197Au were measured. The target fragment radioactivities were measured by off-line gamma-ray spectroscopy. Details of the measurement as well as the calculation of the independent isotopic production cross ...

The results given in the report were obtained using abrasive water jet cutting equipment and represent as follows: (i) For all flat plate samples a range of speeds was tried, the speed quoted being the fastest recorded to completely cut the full section d...

Thermal spray cermet and metallic coatings are widely applied for abrasion and friction control in a variety of industries. In this work, the abrasion and friction behavior of WC-Co coatings has been examined in relation to their carbide size and distribution, and anisotropic mechanical properties. In addition, the friction behavior of molybdenum based ...

...2011-01-01 false Abrasions, bruises, abscesses, pus, etc. 311.14 Section 311.14 Animals and Animal Products...PARTS § 311.14 Abrasions, bruises, abscesses, pus, etc. All slight, well-limited abrasions on the tongue and...

... abrasion and folding endurance of materials; the fixtures also included devices for the cycling of the space suit elbow section, glove, neckring, and ...

The cross sections of the fragments that are produced by the 80 A MeV |Tz| = 2 mirror nuclei 20Mg/20O, 24Si/24Ni, 36Ca/36S, 40Ti/40Ar, 44Ca/44Cr and 60Ni/60Ge colliding on the 12C target are calculated using the statistical abrasion-ablation model. The isospin dependence of the projectile fragmentation (or the isospin effect) in the ...

A hydrodynamically lubricated squeeze packing type rotary shaft with a cross-sectional geometry suitable for pressurized lubricant retention is provided which, in the preferred embodiment, incorporates a protuberant static sealing interface that, compared to prior art, dramatically improves the exclusionary action of the dynamic sealing interface in low pressure and ...

The cross sections of 15 products produced in the relativistic heavy-ion reactions of 211 and 377 MeV/nucleon /sup 20/Ne ions with Cu were measured using activation techniques. The isobaric mass yield curves measured in this study compare well with previous results of relativistic heavy-ion- and proton-induced Cu spallation after taking into account the ...

Ingot casting has been scaled up to 16 cm x 16 cm square cross-section size weighing up to 8.1 kg. The high degree of crystallinity has been maintained in the large ingot. For large sizes, the non-uniformity of heat treatment causes chipping of the surfac...

A heat-type air-drying installation with an adjustable length of adsorption cycle at a dew point of -65/sup 0//C was developed to overcome losses associated with nonuniform air distribution over the adsorbent and premature abrasion of the adsorbent by pressure fluctuations. Specifications of the air dryer along with a schematic diagram are given. Advantages include an even ...

... Title : The Radar Cross Section of a Two Dimensional ... Descriptors : *LAYERS, *DIELECTRICS, *RADAR CROSS SECTIONS, MATERIALS, RADIUS ...

... for the production of the C triplet Pi ... the peak value of the cross section. ... EXCITATION, DIFFERENTIAL CROSS SECTIONS, MOLECULAR ENERGY ...

... cross section ratios; Elastic scattering cross sections; and ... ENERGY LEVELS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, ELECTROSTATIC ...

... The principally polarized radar cross section is derived by ... Descriptors : *RADAR CROSS SECTIONS, WEDGES, CONICAL BODIES, RADAR ...

... cross sections as seen by remote receivers are of interest. In general, the radar cross section of an object can be determined ...

Microscopic, group averaged cross sections and scattertransfer cross sections for beryllium are presented in 24 group format. (auth)

... sufficiently hardened.�4.�Grind the specimen with an abrasive of less than 46 μm in size until ... using LM.�5.�Polish the specimen with an abrasive of less than 11 μm in size to ... ...