2,275 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Losses"  
Results: 1 - 24 next
open access

Dynamics of beam halo in mismatched beams

Description: High-power proton linacs for nuclear materials transmutation and production, and new accelerator-driven neutron spallation sources must be designed to control beam-halo formation, which leads to beam loss. The study of particle-core models is leading to a better understanding of the causes and characteristics of beam halo produced by space-charge forces in rms mismatched beams. Detailed studies of the models have resulted in predictions of the dependence of the maximum amplitude of halo particl… more
Date: September 1, 1996
Creator: Wangler, T. P.; Garnett, R. W.; Gray, E. R.; Ryne, R. D. & Wang, T. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Description of a spectral atmospheric radiation monitoring network

Description: A modest network of four radiometers is described which will be used to make spectral infrared atmospheric emission measurements on a continuous basis starting in the summer of 1978. A commercial infrared radiometer (Barnes model 12-880) forms the basis of the field instrument package. This radiometer is equipped with an eight position filter wheel, an external chopper, and a pyroelectric detector. The detector and filter wheel are located in a cavity behind a germanium lens, which has a 2/sup … more
Date: June 1, 1978
Creator: Martin, Marlo & Berdahl, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Calculation of wake power losses in a two-level array: a simple case study

Description: One method of adding capacity is to install another array of turbines whose hub height is above the existing array. This report estimates the wake interference that could be expected in a two-level array. Interference is estimated for a typical situation that may be encountered by a wind farm developer. A modified Lissaman array model is used to make the wake interference calculations. The model calculations show that the wake interference between the two levels is small for the turbine charact… more
Date: December 1, 1985
Creator: Barnard, J.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

As-operated heat loss coefficients of residential buildings in the Pacific Northwest: An analysis of empirical space-heating energy data

Description: Previous research of residential electrical space-heating data has revealed that the heat loss coefficients obtained from empirical data ( as-operated'' UAs) are, on average, about 25% below the UA calculated from the shell construction of each building. This as-operated UA is obtained from a linear regression of the measured space-heating energy consumption versus the inside-outside temperature difference. This finding indicates that simple steady-state calculation techniques for heating energ… more
Date: January 1, 1992
Creator: Lucas, R. G. & Pratt, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trapped macroparticles in electron storage rings

Description: Sudden drops of the beam lifetime ascribed to the capture of positively charged macroparticles (`dust`) are observed at many high-energy electron storage rings. A trapped macroparticle has a certain thermal lifetime due to energy transfer from the beam; the interplay of different ionizing and discharging processes gives rise to an equilibrium charge. The beam lifetime is reduced by bremsstrahlung both in the field of the atomic nuclei and in the macroscopic field of the highly charged dust part… more
Date: June 1, 1995
Creator: Zimmermann, F.; Seeman, J. T.; Zolotorev, M. & Stoeffl, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An examination of wake effects and power production for a group of large wind turbines

Description: Data from a group of three MOD-2 wind turbines and two meteorological towers at Goodnoe Hills were analyzed to evaluate turbine power output and wake effects (losses in power production due to operation of upwind turbines), and atmospheric factors influencing them. The influences of variations in the ambient wind speed, wind direction, and turbulence intensity were the primary factors evaluated. Meteorological and turbine data collected at the Goodnoe Hills site from April 1 to October 17, 1985… more
Date: April 1, 1988
Creator: Elliott, D. L.; Buck, J. W. & Barnard, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Variation of collector efficiency and receiver thermal loss as a function of solar irradiance

Description: Efficiency and thermal loss of a parabolic trough concentrating solar collector have been measured for values of solar irradiance between 400 W/m/sup 2/ and 1000 W/m/sup 2/. Both parameters are shown to vary significantly with changing solar irradiance. Significant errors can result from improper use of currently published efficiency data.
Date: January 1, 1982
Creator: Dudley, V. E. & Workhoven, R. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measuring heat leak with a heatmeter

Description: The heatmeter or more precisely the heatflowmeter is a device based on thermal conductivity measuring techniques. It consists of a thermal conducting body between two thermometers, with provisions for thermal connections and calibration. The paper describes the design, construction details, calibration and performance of one such heatmeter for use with heat reservoirs at either 4.2 K or 78 K. Near 4.2 K it has a sensitivity of 10 ..mu..W and requires less than a minute to reach steady state. Ne… more
Date: August 1, 1985
Creator: Kuchnir, M.; Gonczy, J. D. & Tague, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reduction in tribological energy losses in the transportation and electric utilities sectors

Description: This report is part of a study of ways and means of advancing the national energy conservation effort, particularly with regard to oil, via progress in the technology of tribology. The report is confined to two economic sectors: transportation, where the scope embraces primarily the highway fleets, and electric utilities. Together these two sectors account for half of the US energy consumption. Goal of the study is to ascertain the energy sinks attributable to tribological components and proces… more
Date: September 1, 1985
Creator: Pinkus, O.; Wilcock, D.F. & Levinson, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High-field bipolar loss measurement apparatus

Description: An apparatus was constructed to measure dissipation in superconducting wire in high alternating fields. The apparatus will be used to make measurements on conductors which must operate in fields up to 7.0 T and rates of field change up to 15 T/s. The magnet for this facility is wound of uninsulated, 15 strand Rutherford cable in which the strand is a 0.812 mm diameter, fully mixed matrix, Cu plus CuNi, multifilament NbTi conductor. The coil is wound in a bath cooled configuration with an overal… more
Date: January 1, 1980
Creator: Thullen, P.; Weldon, D. & Wollan, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Unified formulation for linear accelerator design

Description: Expressions for peak and average powers required to produce a given average gradient in an accelerator section are given. They are valid for both lossy and lossless (superconducting) sections, for both traveling wave and standing wave sections, and for pulsed or continuous wave rf input. The expressions are given in terms of structure parameters that are equally applicable to traveling wave or standing wave. These parameters delineate the effect of wall losses and energy required to build up th… more
Date: May 1, 1986
Creator: Farkas, Z. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Coupled radio-frequency quadrupoles as compensated structures

Description: The usefulness of radio-frequency quadrupoles (RFQs) for accelerating and bunching high-current beams in a compact-lightweight structure is well known. Until now, however, RFQs have been used only for low-energy acceleration because the structure operates in the 0 mode, and problems of mode coupling and field uniformity multiply as the length of the RFQ increases. In general, significant improvements against perturbations in the 0 or {pi} mode can be obtained by providing the structure with ano… more
Date: January 1, 1990
Creator: Browman, M. J. & Young, L. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evacuated tubular collector utilizing a heat pipe. Final report, August 1-September 30, 1977

Description: The evaluation of three evacuated tubular solar collector designs is reported: heat pipe cusp; counter flow cusp; and counter flow/flat plate. Comparative field testing of 4' x 4' modules was completed for all three designs. Thermal analysis of data shows that the evacuated heat pipe/cusp collector is a viable concept, more suitable for medium to high temperatures and high solar flux intensities.
Date: January 1, 1977
Creator: Ortabasi, U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation into the feasibility of an air curtain for a solar central receiver. Final report

Description: An experimental investigation into the feasibility of using an air curtain to decrease the convective losses from a solar central receiver cavity is described. The investigation makes use of a simplified small-scale model of a cavity, the side walls of which are electrically heated to simulate the effects of the sun. Although optimization of air-curtain performance was not within the scope of this work, a decrease in convective losses of approximately 35% was achieved. In this report, the appar… more
Date: June 1, 1984
Creator: McMillan, O. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Initial study of thermal energy storage in unconfined aquifers. [UCATES]

Description: Convective heat transport in unconfined aquifers is modeled in a semi-analytic way. The transient groundwater flow is modeled by superposition of analytic functions, whereby changes in the aquifer storage are represented by a network of triangles, each with a linearly varying sink distribution. This analytic formulation incorporates the nonlinearity of the differential equation for unconfined flow and eliminates numerical dispersion in modeling heat convection. The thermal losses through the aq… more
Date: April 1, 1986
Creator: Haitjema, H.M. & Strack, O.D.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of the thermal energy standards for manufactured housing proposed by the Manufactured Housing Institute Consensus Committee

Description: Congress passed legislation that requires the US Department of Housing and Urban Development (HUD) to revise the energy efficiency standards for manufactured housing contained in the Manufactured Home Construction and Safety Standards (MHCSS). The Manufactured Housing Institute's Consensus Committee (MHICC) proposed revised standards to HUD based on an analysis contained in a 1989 report by E. Levy. This document is primarily a review of the Levy report, including the methods and inputs to… more
Date: February 1, 1992
Creator: Conner, C.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Intercooler cooling-air weight flow and pressure drop for minimum drag loss

Description: Report presenting an analysis of the power losses in airplane flight of cross-flow plate and tubular intercoolers to determine the cooling-air weight flow and pressure drop that give minimum total power loss for any given cooling effectiveness. The investigation covers a range of flight conditions of altitude, airspeed, lift-drag ratio, supercharger-pressure ratio, and adiabatic efficiency.
Date: April 1944
Creator: Reuter, J. George & Valerino, Michael F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Approximate effect of leading-edge thickness, incidence angle, and inlet mach number on inlet losses for high-solidity cascades of low cambered blades

Description: Report presenting an approximate, theoretical analysis of the inlet or induction losses due to subsonic flow into a high-solidity cascade of finite thickness blades at incidence angle. Results indicated that the losses can become considerable for large deviations from the design incidence such as compressor off-design operating conditions. Results regarding the computational results, significance of assumptions and limitations, comparison of theoretical approximation with actual compressor resu… more
Date: December 1954
Creator: Wright, Linwood C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Prediction of losses induced by angle of attack in cascades of sharp-nosed blades for incompressible and subsonic compressible flow

Description: Report presenting a method of computing the losses in total pressure caused by a non-zero angle of attack at the inlet to a row of sharp-nosed blades for both incompressible and subsonic compressible flow. The method is based on momentum considerations across a row of zero-thickness flat plates and assumes that the blade force is normal to the plate surface.
Date: January 1955
Creator: Kramer, James J. & Stanitz, John D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An evaluation of non-Newtonian flow in pipe lines

Description: Report presenting an analysis of a method for determining pressure losses due to the flow of non-Newtonian materials in pipe lines by using basic flow data obtained from measurements of flow curves, which are rate-of-shear-shear-stress curves. Reported flow and pressure data are analyzed. The validity of the generalized friction diagram for describing flow of Bingham plastics in pipe lines is shown by an evaluation of experimental data of two independent investigators.
Date: February 1955
Creator: Weltmann, Ruth N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen