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981 Matching Results
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Physics at hadron colliders: Experimental view
The physics of the hadron-hadron collider experiment is considered from an experimental point of view. The problems encountered in determination of how well the standard model describes collider results are discussed. 53 refs., 58 figs.
Date:
August 1, 1987
Creator:
Siegrist, J.L.
Object Type:
Article
System:
The UNT Digital Library
Enhanced durability and reactivity for zinc ferrite desulfurization sorbent
AMAX Research Development Center (AMAX R D) has been investigating methods for enhancing the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. For the present program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-scale, fixed-bed reactor. Durability may be defined as the ability of the sorbent to maintain important physical characteristics such As size, strength, and specific surface area during 10 cycles of sulfidation and oxidation.
Date:
August 28, 1987
Creator:
Jha, Mahesh C.; Baltich, Linda K. & Berggren, Mark H.
Object Type:
Report
System:
The UNT Digital Library
Transverse energy distributions in Si + nucleus collisions at 10 GeV/nucleon
Transverse energy distributions have been measured for collisions of 10 GeVnucleon Si with targets of Al, Cu and Pb using a combination of a NaI wall and a uranium based sampling calorimeter. The measured cross sections d..sigma..dE/sub T/ and dE/sub T/d)eta are consistent with full stopping and an increase, with increasing values of E/sub T/, of energy flow into large angles. 4 refs., 7 figs., 2 tabs
Date:
August 1, 1987
Creator:
Bassalleck, B; Braun-Munzinger, P.; Cleland, W.; G., David; Farooq, A.; Fatyga, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Development of highly polished, grazing incidence mirrors for synchrotron radiation beam lines at SSRL
New platinum-coated grazing incidence mirrors with low surface roughnesses have been developed to focus bending magnet radiation from the SSRL/SLAC SPEAR storage ring on the entrance slits of two Beam Line VIII grating monochromators. The first mirror in the toroidal grating monochromator (TGM) branch is a cooled SiC cylinder capable of absorbing synchrotron radiation power levels of up to 260 watts without excessive distortion. This mirror deflects the beam vertically through a 12/degree/ angle and focuses it sagitally on the TGM entrance slit plane. The second TGM optical element is a fused-silica spherical mirror with a large radius of curvature that deflects the beam vertically through an additional 12/degree/ and focuses it tangentially with 3/1 demagnification. The first mirror in our spherical grating branch is a 5/degree/-vertically deflecting, cooled SiC toroid designed to focus tangentially on the monochromator entrance slits and sagitally in the exit slits. A 4/degree/-deflecting fused silica mirror is used after the exit sites in each beam line to refocus on to the sample. For this application a thin cylinder is bent to approximate an ellipsoid. The mirrors are now installed at SSRL and performance measurements are planned. Qualitatively the focus of the TGM optics at the …
Date:
August 1, 1987
Creator:
Tirsell, K. G.; Berglin, E. J.; Fuchs, B. A.; Holdener, F. R.; Humpal, H. H.; Karpenko, V. P. et al.
Object Type:
Article
System:
The UNT Digital Library
Similarity solutions of nonlinear partial differential equations invariant to a family of affine groups
Problems of technological interest can very often be described by partial differential equations (PDEs) with one dependent and two independent variables (call them c, z, and t, respectively). Many such PDEs are invariant to one-parameter families of one-parameter affine groups. Similarity solutions are solutions of the PDE that are invariant to one group of the family. The great utility of similarity solutions is that they may be calculated by solving an ODE rather than a PDE and are thus much more easily accessible than other solutions. The form of the principal ODE depends, of course, on the form of the PDE, but it can be proved quite generally that the principal ODE is itself invarient to the one-parameter affine group or associated group. because of the invariance of the principal ODE to the associated group, the dependence on the boundary and initial conditions of certain special values of the function y(x), e.g., y(O), y(infinity), y(O), ets., may be predicted a priori without solving the principal ODE. The nonlinear PDE of heat transport in superfluid He-II, is used as an illustration of these ideas in this review.
Date:
August 1, 1987
Creator:
Dresner, L.
Object Type:
Article
System:
The UNT Digital Library
Mirror theory applied to toroidal systems
Central features of a mirror plasma are strong departures from Maxwellian distribution functions, ambipolar potentials and densities which vary along a field line, and losses, and the mirror field itself. To examine these features, mirror theorists have developed analytical and numerical techniques to solve the Fokker-Planck equation, evaluate the potentials consistent with the resulting distribution functions, and assess the microstability of these distributions. Various combinations of mirror-plasma fetures are present and important in toroidal plasmas as well, particularly in the edge region and in plasmas with strong r.f. heating. In this paper we survey problems in toroidal plasmas where mirror theory and computational techniques are applicable, and discuss in more detail three specific examples: calculation of the toroidal generalization of the Spitzer-Haerm distribution function (from which trapped-particle effects on current drive can be calculated), evaluation of the nonuniform potential and density set up by pulsed electron-cyclotron heating, and calculation of steady-state distribution functions in the presence of strong r.f. heating and collisions. 37 refs., 3 figs.
Date:
August 25, 1987
Creator:
Cohen, R.H.
Object Type:
Article
System:
The UNT Digital Library
[Memo from Rogers W. Redding to Richard Rafes, August 14, 1987]
Memo from Rogers W. Redding to Richard Rafes, on August 14, 1987, sending a copy of the concept paper for the Texas Academy of Mathematics and Science, as well as a one page executive summary.
Date:
August 14, 1987
Creator:
Reddings, Rogers W.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Barbara Jungjohan to the Student Affairs Committee, August 27, 1987]
Memo from Barbara Jungjohan to members of the Student Affairs Committee, on August 27, 1987, establishing a time for the first meeting of the fall semester. An agenda is included, and she asks that she be informed if a member can't make the meeting.
Date:
August 27, 1987
Creator:
Jungjohan, Barbara
Object Type:
Letter
System:
The UNT Digital Library
[Memorandum from Richard Rafes to Alfred Hurley, August 4, 1987]
Memorandum from Richard Rafes to Alfred Hurley on August 4, 1987, regarding a meeting with the Texas Education Association, where it was decided that the Texas Academy of Math and Science should serve as an early admissions program to college, rather than an advanced public high school. They agreed to aspects regarding funding, curriculum, admissions, extracurricular activities, residency requirements, discipline and student conduct, and regulation and reporting to TEA.
Date:
August 4, 1987
Creator:
Rafes, Richard
Object Type:
Letter
System:
The UNT Digital Library
[Memorandum from Frank Kemerer, August 11, 1987]
Memorandum from Frank Kemerer to Julia Dunn, Barbara Jungjohan, Peter Lane, Betsy McGuire, Bruce Meeks, and Byron Medler, on August 11, 1987, informing them that Dr. Rogers Redding has accepted the assignment as Director of the Texas Academy of Math and Science. Kemerer mentions that he has turned chairmanship of the Student Affairs Committee to Barbara Jungjohan, as well as plans to expand the committee.
Date:
August 11, 1987
Creator:
Kemerer, Frank R.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Richard Rafes, August 5, 1987]
Letter from Richard Rafes to Cathy Peavler, Tom Patton, and David Thompson on August 5, 1987, thanking them for meeting with him and James Miller about the Texas Academy of Mathematics and Science, and summarizing the understandings they came to in regards to funding, curriculum, admissions, extracurricular activities, residency requirements, discipline and student conduct, and regulations and reporting to TEA.
Date:
August 5, 1987
Creator:
Rafes, Richard
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Richard Rafes, August 5, 1987]
Letter from Richard Rafes to Cathy Peavler, Tom Patton, and David Thompson on August 5, 1987, thanking them for meeting with him and James Miller about the Texas Academy of Mathematics and Science, and summarizing the understandings they came to in regards to funding, curriculum, admissions, extracurricular activities, residency requirements, discipline and student conduct, and regulations and reporting to TEA.
Date:
August 5, 1987
Creator:
Rafes, Richard
Object Type:
Letter
System:
The UNT Digital Library
[Letter from James J. Muro to Hugh Grove, August 13, 1987]
Letter from James J. Muro to Hugh Grove, on August 13, 1987, sending a proposal for the James R. Doughterty Foundation to sponsor four students by donating $32,000 to the Texas Academy of Mathematics and Science. The proposal is included.
Date:
August 13, 1987
Creator:
Muro, James J.
Object Type:
Letter
System:
The UNT Digital Library
[Excerpt from Vernon's Texas Codes Annotated]
Excerpt from Vernon's Texas Codes Annotated, which is the legislative authority for the Texas Academy of Mathematics and Science.
Date:
August 31, 1987
Creator:
unknown
Object Type:
Legal Document
System:
The UNT Digital Library
[Letter from James J. Muro to James D. Runzheimer, August 14, 1987]
Letter from James J. Muro to James D. Runzheimer, on August 14, 1987, noting that North Texas State University is seeking funding for the Texas Academy of Math and Science, and sending a short summary of the academy concept.
Date:
August 14, 1987
Creator:
Muro, James J.
Object Type:
Letter
System:
The UNT Digital Library
A Review of Two-Phase Flow-Induced Vibration
Two-phase flow exists in many shell-and-tube heat exchangers and power generation components. The flowing fluid is a source of energy that can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities. In fact, many practical system components have experienced excessive flow-induced vibrations. To prevent unacceptable flow-induced vibration, we must understand excitation mechanisms, develop analytical and experimental techniques, and provide reliable design guidelines. Thus, we are conducting a comprehensive program to study structural vibration in components subjected to two-phase flow. This report reviews the current understanding of vibration of circular cylinders in quiescent fluid, cross-flow, and axial flow, with emphasis on excitation mechanisms, mathematical models, and available experimental data. A unified theory is presented for cylinders oscillating under different flow conditions. Based on the theory, future research needs are outlined.
Date:
August 1987
Creator:
Chen, Shoei-Sheng
Object Type:
Report
System:
The UNT Digital Library
A Review of Parameterizations of Microphysical Processes in Clouds for Application in Models of Regional Atmospheric Deposition
The literature on parameterizations of cloud microphysical processes was reviewed to examine the theoretical bases of those parameterizations and to evaluate their applicability to regional models. New parameterizations were produced by multiple regression upon the solution fields derived from simulations of a cloud model incorporating sophisticated microphysics. The currently available rates for cloud microphysical interactions were generally derived under the assumption that the size distribution functions for various hydrometeors are given. Such parameterizations must therefore be applied with caution because the spectral evolution of various types of hydrometeors in reality varies significantly during the stages of cloud development. Uncertainties exist in assigning values for aerodynamic properties such as the bulk collection efficiency, and the growth processes for various types of ice crystals are not well enough known for accurate multiphase cloud-microphysics parameterizations. The new parameterizations, in general, compare favorably with those currently available and are more efficient and applicable to regional models. The largest discrepancies occur in the autoconversion rates, whereas the accretion rates agree closely when the assumed collection efficiencies in other formulas are smaller than unity.
Date:
August 1987
Creator:
Lee, L. Y. & Hong, M. S.
Object Type:
Report
System:
The UNT Digital Library
Weight Losses of Marble and Limestone Briquettes Exposed to Outdoor Environments in the Eastern United States
Weight losses of marble and limestone samples exposed to outdoor environments at field sites in the eastern United States have been monitored in studies initiated in 1984. The procedures are described, and the results are tabulated and discussed. A rate of marble loss approximately equivalent to 16 micrometers of surface recession per year was found in North Carolina, and losses of this order were also observed in New Jersey, New York, and Washington, DC. Limestone weight losses were much higher than for marble in the first year; loss of extraneous materials from the porous limestone appeared to be a likely contributor to the overall loss. The rate of limestone loss diminished in the second year, though it continued to be higher than for marble. Exposures are continuing in a planned 10-yr program of tests.
Date:
August 1987
Creator:
Youngdahl, C. A.
Object Type:
Report
System:
The UNT Digital Library
Physics Division Annual Review 1 April 1986 - March 1987
Report of activities of the Argonne Physics Division, including medium-energy physics research, ATLAS research, theoretical nuclear physics, superconducting LINAC development, and accelerator operations.
Date:
August 1987
Creator:
Argonne National Laboratory. Physics Division.
Object Type:
Report
System:
The UNT Digital Library
Application of microwave energy for in-drum solidification of simulated precipitation sludge
The application of microwave energy for in-container solidification of simulated transuranic contaminated precipitation sludges has been tested. Results indicate volume reductions to 83% are achievable by the continuous feeding of pre-dried sludge into a waste container while applying microwave energy. An economic evaluation was completed showing achievable volume and weight reductions to 87% compared with a current immobilization process for wet sludge. 7 refs., 15 figs., 16 tabs.
Date:
August 17, 1987
Creator:
Petersen, R. D.; Johnson, A. J.; Swanson, S. D. & Thomas, R. L. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Monopole strength as a probe of nuclear shape mixing
The monopole strength, MS, within a single set of nuclear shape excitations is compared with the MS between different shapes. After misconceptions are pointed out concerning the spin dependence of B(E2) values, MS properties are juxtaposed with gamma-ray and beta-decay properties of /sup 70/Se, /sup 96/Zr, /sup 102/Pd, and the N = 60 isotones to illustrate the utility of combined investigations and evidence is given for the observation of a two-phonon octupole multiplet. Finally, consideration is given to the dominance of the /sup 3/S/sub 1/ force in producing deformation in the N > 50 1g nuclei. 23 refs., 4 figs.
Date:
August 17, 1987
Creator:
Meyer, R.A.
Object Type:
Article
System:
The UNT Digital Library
Gasification of char in a membrane filter: Final report
This report deals with the feasibility of reducing the amount of char on a barrier filter by in-place gasification. Compared to the very rapid pyrolysis step, the gasification of char on a filter requires substantial time under conditions that favor the gasification reactions. Three categories of information were of greatest interest: (1) The origin, characteristics and properties of the char. (2) The conditions under which the char was gasified and the rates and extents of the gasification reactions. (3) Any interpretation or mathematical modelling of the experimental results. 74 refs., 10 tabs.
Date:
August 1, 1987
Creator:
Hess, M. & Di Bella, C.A.W.
Object Type:
Report
System:
The UNT Digital Library
Conceptual design of a black liquor gasification pilot plant
In July 1985, Champion International completed a study of kraft black liquor gasification and use of the product gases in a combined cycle cogeneration system based on gas turbines. That study indicated that gasification had high potential as an alternative to recovery boiler technology and offered many advantages. This paper describes the design of the plant, the construction of the pilot plant, and finally presents data from operation of the plant.
Date:
August 1, 1987
Creator:
Kelleher, E. G.
Object Type:
Report
System:
The UNT Digital Library
Neutron Production of Charm Particles in Fermilab E-400
Results are presented from Fermilab E-400 on the production of charmed baryons and mesons using incident neutrons. We show evidence for the charm-strange baryon, ..xi../sub c//sup +/, and present our measurements of its mass, width, lifetime, cross section and relative branching fractions, and the A, x/sub f/, p/sub t/, and particle/antiparticle dependence of the state. We show evidence for both the ..sigma../sub c//sup + +/ and ..sigma../sub c//sup 0/, and present measurements of three mass differences, ..sigma../sub c//sup + +/ - ..sigma../sub c//sup 0/, ..sigma../sub c//sup 0/ - ..lambda../sub c//sup +/, and ..sigma../sub c//sup + +/ - ..lambda../sub c//sup +/. Preliminary results on the ratio of two decay modes of the D/sup 0/ are shown. D/sup 0/ ..-->.. K/sup +/K/sup -/ and D/sup 0/ ..-->.. K/sub 0/ anti K/sub 0/. The latter mode has not been previously observed. 8 refs., 10 figs.
Date:
August 20, 1987
Creator:
Cumalat, J. P.; Binkley, M.; Bossi, F.; Butler, J.; Coteus, P.; DiCorato, M. et al.
Object Type:
Article
System:
The UNT Digital Library