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90,113 Matching Results

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(open access)

AN INVESTIGATION OF THE HIGH-TEMPERATURE PROPERTIES OF THE AISI TYPE 502 STEEL

None

Date: November 28, 1961

Creator: Martin, W. R. & McCoy Jr., H. E.

Object Type: Report

System: The UNT Digital Library

(open access)

Tertiary Blast Effects: The Effects of Impact on Mice, Rats, Guinea Pigs and Rabbits. Technical Progress Report

A total of 455 mlce, rats, gulnea plgs, and rabbits was subjected to lmpact at velocitles ranglng between 25 ft/sec and 51 ft/sec. The deslred velocities were generated by allowlng the anlmals to free-fall from various helghts to a flat concrete pad. The ventral surface of each anlmal was the area of impact. Problt analyses of the 24-hr mortallty data ylelded LD/sub 50/ lmpact veloclties with 95% confldence limits as follows: mouse, 39.4 (37.4 to 42.0) ft/ sec; rat, ft/sec; and rabbit, 31.7 (30.2 to 33.3) ft/sec. The LD/sub 50/ figures for the mouse and rat were slgnificantly higher, statlstically, than those for the gulnea plg and rabblt. The small spread ln the LD/sub 50/ values suggested little variation ln the tolerance of blologlcal systems to impact. Further, the steepness of the mortallty curves lndicated a narrow survlval range to lmpact. Extrapolatlon of the experimental data to the 70 kg anlmal yielded a predicted LD/ sub 50/ impact velocity of 26 ft/sec (18 mph). Literature relevant to the human case was revlewed and the tentative appllcabllity of the predlcted flgures to adult man ls discussed. (auth)

Date: February 28, 1961

Creator: Richmond, D. R.; Bowen, I. G. & White, C. S.

Object Type: Report

System: The UNT Digital Library

(open access)

REMOTELY CONTROLLED SHEARING OF PIPE AND STRUCTURAL MEMBERS

A shearing tool was developed for remotely controlled severing of pipes or structural members. The shear is rotated about its axis in a wrist motion by the pumped hydraulic fluid that also powers the shear blade. It can be used in a stationary mounting or suspended from a crane. A C-shaped support for the shear was designed to pass through a small top opening of a shielded cell. The controls for manipulating the shear pass through or along the Cframe. The shear jaw opens to 5 in. in height and 7 in. in width, and the total weight of the tool is only 575 lb. It was used to cut metal sections 4 3/4 in. thick and 4-in. sched.-40 stainless steel pipe. (auth)

Date: December 28, 1961

Creator: Abbatiello, A. A.

Object Type: Report

System: The UNT Digital Library

(open access)

GAS-COOLED REACTOR PROGRAM. QUARTERLY PROGRESS REPORT FOR PERIOD ENDING JUNE 30, 1961

Activities are discussed for research in design investigations, and materials development and testing conducted in connection with the development of the EGCR. The discussions are given in terms of: reactor physics; reactor design studies; heat transfer and fluid now investigations; materials development; in- pile and out-of-pile testing of components and materials; and development of test loops and components. (B.O.G.)

Date: August 28, 1961

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

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

(open access)

Reactor Controls Reliability and Maintenance at the ORR

Early evaluation and study of the various criteria for the ORR clearly established the requirements for the fundarnental safety and control instrumentation, and the instrumentation was well integrated into the design and construction of the plant. However, it was not designed for the optimum of maintenance convenience and minimum reactor down time in the event of instrument failure. The revisions and additions that have been made in the physical plant and maintenance which have resulted in a definite reduction of reactor down time resulting from instrument failure in the reactor and in the experiments are described. (auth)

Date: August 28, 1962

Creator: West, K.W.

Object Type: Report

System: The UNT Digital Library

(open access)

Comparison of Gaseous Waste Handling Systems for PL-3

Gaseous waste handling systems are compared for direct and indirect boiling water and pressurized water reactors for PL-3 application. Areas that are common to the various concepts are not discussed since they do not enter into a comparison study. The major differences present are in the handling of active gases released to or held in the primary system coolant. These gases which could be present, their possibIe release from the system, and the necessary processing requirements are discussed in detail. Sufficient information is presented to enable one to analyze the methcds required to remove gaseous activity present in other size and type pressurized and boiIing water reactors. (auth)

Date: February 28, 1962

Creator: Noble, J. H. & Duke, E. E.

Object Type: Report

System: The UNT Digital Library

$Broadband diffractive lens$ (open access)

Broadband diffractive lens

Significant progress has been made toward solving the century-old problem of chromatic aberrations in diffractive optics. Our approach exploits modern materials and microfabrication technology and is very different from the purely diffractive strategy,'' which is commonly employed and which results in multiple diffractive elements separated by a finite distance. We have developed a Fresnel zone plate lens comprised of a serial stack of patterned minus-filters which allows broadband radiation to be focused (or imaged) without longitudinal or transverse chromatic aberrations. 7 refs., 4 figs.

Date: May 28, 1991

Creator: Ceglio, N. M.; Hawryluk, A. M.; London, R. A.; Seppala, L. G. (Lawrence Livermore National Lab., CA (USA)) & Gaines, D. P. (Brigham Young Univ., Provo, UT (USA))

Object Type: Article

System: The UNT Digital Library

(open access)

Instrumentation for two-phase geothermal flow

None

Date: May 28, 1975

Creator: Calder, C. A.

Object Type: Report

System: The UNT Digital Library

Ensemble: 2017-09-28 – UNT Wind Symphony

Access: Use of this item is restricted to the UNT Community

Band concert performed at the UNT College of Music Winspear Hall.

Date: September 28, 2017

Creator: North Texas Wind Symphony

Object Type: Video

System: The UNT Digital Library

(open access)

Toxic vapor hazard of heated mock high explosive. [200 to 700/sup 0/C]

None

Date: April 28, 1975

Creator: Distler, T. M. & Kwok, Y. M.

Object Type: Report

System: The UNT Digital Library

(open access)

Flexible Monte Carlo Programs FMC-N and FMC-G

Flexible Monte Carlo programs FMC-N and FMC-G (GE-ANPD Programs 516 and 515) are digital computer programs which apply Monte Carlo methods to simulate neutron and gamma ray life histories, respectively, in a source-shield configuration. The programs were designed for flexlbility in the geometrical, material, nuclear, and source descriptions of source-shield configurations and variance reduction techniques. The programs were also designed to optimize the use of fast memory and to provide complete freedom in the dimensions of the various input quantities. The programs are coded for an IBM-704 computer with a fast memory capacity of 32,768 storage locations and eight magnetic tape units, and for an IBM7090 computer wlth a fast memory capacity of 32,768 storage locations and ten magnetic tape unlts on two date channels. No magnetic drum storage is necessary for either computer. (auth)

Date: April 28, 1961

Creator: Loechler, J. J. & MacDonald, J. E.

Object Type: Report

System: The UNT Digital Library

(open access)

Small Power Reactor Projects of the United States Atomic Energy Commission

Information on small power reactor projects of the USAEC is summarized. General information concerning the projects as a whole is given. Specific projects discussed include: the Elk River Power Reactor, the Piqua Nuclear Power Facility, the BONUS Power Reactor, the Pathfinder Power Reactor, the small-size pressurized water power reactor, and the experimental low-power process heat reactor. (M.C.G.)

Date: September 28, 1961

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

Primary Shield Optimization Survey for the PL-3 Reactor

A detailed study of four reactor and shield configurations was made. Two basic reactor types, the boiling water and pressurized water reactors were considered. Shield materials of lead-water and iron-water were used with varying thicknesses for determining the optimum shield configuration for the PL-3 reactor. Also presented is a survey of available shielding codes. (auth)

Date: June 28, 1962

Creator: Scoles, J. F. & Crouch, A. N.

Object Type: Report

System: The UNT Digital Library

(open access)

Chemical Processing Technology Quarterly Progress Report, October-December 1961

The ICPP processed Al fuel, prtncipally of the MTR-ETR type, durtng this quarter. Newly designed and installed processing equipment exhibited excellent operating performance. This included direct-air-pulsed extraction, stripping and scrub columns, and a cascade-controlled continuous evaporator in first cycle product concentration service. Aqueous zirconium fuel processing studies continued with the objective of adapting the hydrofluoric acid process to continuous dissolution-complexing to increase the capacity of the LCPP process while using as much existing equipment as possible to minimize costs. Six variations of hydrofluoric acid flowsheets were tested in a smallscale continuous dissolvers. Dissolution rates were found to be high in all cases and dissolution was easily initiated at temperatures as low as 36 deg C. Monel and Carpenter 2O(Nb) were found to be satisfactory construction materials, from the standpoint of corroston, if oxidizing conditions were carefully controlled. Additional studies are reported on the stability of blended Zr and Al process raffinates and on the nature of the solids which result from the sodium formate headend precipitation process. Electrolytic dissolution studies, dtrected at fundamentals of current utiltzation in a series''-type dissolver, demonstrated that high current utilization is obtained when the polarization resistance is small compared with the solution resistance. Factors affecting …

Date: March 28, 1962

Creator: Bower, J. R.

Object Type: Report

System: The UNT Digital Library

(open access)

THE OAK RIDGE RESEARCH REACTOR (ORR), THE LOW-INTENSITY TESTING REACTOR (LITR), AND THE OAK RIDGE GRAPHITE REACTOR (OGR) AS EXPERIMENT FACILITIES

>Characteristics of the ORR, LITR, and OGR that experimenters have found to be important are listed. The results of a survey conducted among experimenters on the utility of the reactors for various types of experiments are discussed, and some changes which might be made to improve the utilization are listed. A brief outline, with references, of most of the experiments currently being performed is included. (auth)

Date: August 28, 1962

Creator: George, K.D.

Object Type: Report

System: The UNT Digital Library

(open access)

Resonators for heavily beam-loaded linacs

Capacitively loaded resonant line section accelerating structures are discussed. Prototype models were measured at low levels, and calculations were made to predict high level operation. High current composite beams of multiple-beamlets as accelerated by a MEQALAC were assumed.

Date: April 28, 1980

Creator: Sanders, R.T.

Object Type: Report

System: The UNT Digital Library

(open access)

Amplified-response-spectrum analysis of sodium-water reaction pressure waves. [LMFBR]

This report deals with a frequency spectrum evaluation of the SWAAM I predicted double rupture disc assembly operation pressure wave generated in the LLTR Series II A-2 test. It also evaluates the same wave predicted by the TRANSWRAP II code and the pressure wave actually measured upstream of the rupture disc assembly by the test instrumentation in Test A-2. The SWAAM I and TRANSWRAP II codes currently use the same analytical model to characterize the rupture disc until the disc strikes the knife edges. Thereafter, the SWAAM I code relies on analytical techniques to characterize the phenomena, whereas the TRANSWRAP II code uses empirical parameters based on A-2 test data to represent the disc behavior. Any differences in the predicted dynamic pipe loads caused by double rupture disc assembly operation, using the forcing functions predicted by the codes can, therefore, be traced to this difference.

Date: October 28, 1981

Creator: Knittle, D.E.

Object Type: Report

System: The UNT Digital Library

(open access)

Solar heating and cooling of buildings: Phase I (non-residential). InterTechnology/Solar Corporation cost/benefit analysis report and supporting opinion survey, commercial buildings. National Solar Demonstration Program, executive summary

A parametric study was performed to provide an estimate of the number of non-residential solar demonstration projects that will be required to start a commercial industry in solar equipment manufacturing, marketing, financing, and installation. An opinion survey was conducted among several experts in the field and results are shown. A techno-economic computer simulation of the solar industry was constructed. This simulation predicts the response of the marketplace to the ERDA program. The computer model showed that ERDA should offer to pay 75% of the initial cost of the system plus 90% of the maintenance and insurance costs over the next 20 years. The predicted response of the marketplace to the ERDA offer of 75%/90% is that 667 demonstration units would be built in all regions of the country, except the region around Seattle, Washington. (MHR)

Date: October 28, 1976

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

Electron energy distributions, vibrational population distributions, and negative-ion concentrations in hydrogen discharges

We consider the negative ion concentrations in hydrogen discharges caused by electron excitation and dissociative attachment processes. The principal formation and destruction processes are discussed for electron densities in the range 10/sup 8/ to 10/sup 13/ electrons cm/sup -3/. Expressions are developed for calculating the high energy portion of the electron energy distribution in the discharge; using these energy distributions the electron excitation rates are evaluated. At low densities, the vibrational distribution arises from singlet electronic excitations and triplet excitations through the /sup 3/..pi../sub u/ state, in equilibrium with wall de-excitation processes. At high densities singlet excitations predominate in equilibrium with atom-molecule de-excitation processes. Possibilities for negative ion generation in a two-chamber tandem system are discussed in which the vibrational excitation occurs in a high power, high electron temperature discharge, kT/sub e/ = 5 eV, and dissociative attachment occurs in a low temperature kT/sub e/ = 1 eV, plasma chamber.

Date: June 28, 1982

Creator: Hiskes, J.R. & Karo, A.M.

Object Type: Article

System: The UNT Digital Library