7,848 Matching Results

Search Results

Advanced search parameters have been applied.

The Volatile Matter of Coal

Description: From Introduction Scope of Report: "This bulletin is a report on an investigation of the volatile matter in several typical coals-its composition and amount at different temperatures of volatilization. As the investigation is still in progress and will doubtless include other coals than those already examined, the bulletin may be considered a preliminary report, stating the problems studied, the methods used, and the results thus far obtained."
Date: 1912
Creator: Porter, Horace C. & Ovitz, F. K.
Partner: UNT Libraries Government Documents Department

HYPER-STRANGE HADRONIC MATTER

Description: The binding energy of hyper-strange matter in the hadronic phase is calculated as a function of strangeness fraction in the mean field approximation to a relativistic field theory of matter. This is compared to a calculation of Chin and Kerman for the quark phase.
Date: November 1, 1980
Creator: Glendenning, Norman K.
Partner: UNT Libraries Government Documents Department

An Analysis of Angus Wilson's "No Laughing Matter"

Description: This thesis examines Angus Wilson's novels with particular attention to No Laughing Matter, 1967. The introductory overview of Wilson's first five novels and the examination of No Laughing Matter show that all Wilson's novels are concerned with his protagonists' capacity for self-deception and the ways deception limits freedom of choice. In No Laughing Matter six protagonists try to balance self-deception and freedom both in their lives and in the art forms which interest them. The thesis traces the lives of these six as they fail both as artists and as people. Chapter III of the thesis studies the relationship of fantasy to character in the novel. In No Laughing Matter particularly, the characters reflect the loss of liberty when individuals do not exercise their freedom to choose.
Date: December 1975
Creator: Arnold, Gloria Cockerell
Partner: UNT Libraries

Search for Halo Axions

Description: A collaboration of MIT, LLNL, Univ. of Florida, FNAL, UC Berkeley and INR Moscow have built a large-scale RF cavity axion detector. The experiment has been taking production data since February of 1996 and is sensitive enough to detect plausible dark matter axions comprising a reasonable fraction of the mass in our galactic halo. After a brief introduction to axion physics, I discuss details of our instrumentation, our analysis methodology, our run plan and future goals of the experiments.
Date: January 1, 1998
Creator: Daw, E. J., & van Bibber, K.
Partner: UNT Libraries Government Documents Department

Large-scale search for dark-matter axions

Description: Early results from a large-scale search for dark matter axions are presented. In this experiment, axions constituting our dark-matter halo may be resonantly converted to monochromatic microwave photons in a high-Q microwave cavity permeated by a strong magnetic field. Sensitivity at the level of one important axion model (KSVZ) has been demonstrated.
Date: January 1, 1998
Creator: Hagmann, C. A.; Kinion, D.; Stoeffl, W.; Van Bibber, K.; Daw, E. J.; McBride, J. et al.
Partner: UNT Libraries Government Documents Department

The Storage of Organic Matter in Bottom Deposits of Lake Dallas

Description: The purpose of this investigation is to find which season of the year organic matter increases most in the bottom deposits of Lake Dallas, the reason for the increase, and the amount of organic matter increase from year to year. It is hoped that this study will be beneficial in understanding the conditions in artificial reservoirs.
Date: 1941
Creator: Williams, Cyrus Paul
Partner: UNT Libraries

A Study of The Mirror

Description: Because of the lack of authoritative secondary material on the Mirror, the need for deeper study into the content of the Mirror appears necessary. In order to fill this need, this study has been undertaken to provide basic information about the Mirror's subject matter and the attitudes of its contributors.
Date: August 1962
Creator: Heaberlin, Dick M.
Partner: UNT Libraries

Reducing Zero-point Systematics in Dark Energy Supernova Experiments

Description: We study the effect of filter zero-point uncertainties on future supernova dark energy missions. Fitting for calibration parameters using simultaneous analysis of all Type Ia supernova standard candles achieves a significant improvement over more traditional fit methods. This conclusion is robust under diverse experimental configurations (number of observed supernovae, maximum survey redshift, inclusion of additional systematics). This approach to supernova fitting considerably eases otherwise stringent mission cali- bration requirements. As an example we simulate a space-based mission based on the proposed JDEM satellite; however the method and conclusions are general and valid for any future supernova dark energy mission, ground or space-based.
Date: April 1, 2011
Creator: Faccioli, Lorenzo; Kim, Alex G; Miquel, Ramon; Bernstein, Gary; Bonissent, Alain; Brown, Matthew et al.
Partner: UNT Libraries Government Documents Department

Measurement and Control of Radioactive Particulate Contamination: Summary Report

Description: The following report is meant to review the characteristics of airborne particulate contamination matter, which sets it apart from other phases of the radiation control program and make it necessary to apply to it different concepts, analytical procedures, and control measures.
Date: 1956
Creator: Match, Theodore F.
Partner: UNT Libraries Government Documents Department

The Contribution of Microarthropods to Aboveground Foodwebs: A Review and Model of Belowground Transfer in a Coniferous Forest

Description: A food web model of predator arthropods and microarthropods was developed based upon data collected at SRS. The model indentifies numerous connections because of the diversity of species. Relationships vary over time and many predators feed on their own group. The model demonstrates the importance of detrital food webs in belowground and aboveground transfers in the ecosystem.
Date: February 15, 1999
Creator: Johnston, J.M.
Partner: UNT Libraries Government Documents Department

Caustic rings of dark matter

Description: It is shown that the infall of collisionless dark matter onto isolated galaxies produce a series of caustic rings in the halo dark matter distribution. The properties of these caustics are investigated. It is found in particular that the density profile of the caustic behaves as the inverse distance to the ring. Bumps in the rotation curve of NGC 3198 are interpreted as due to caustic rings of dark matter.
Date: May 6, 1997
Creator: Sikivie, P.
Partner: UNT Libraries Government Documents Department

Large scale U.S. dark matter Axion search

Description: We describe the instrumentation and operations of the microwave cavity axion detector presently taking data at Lawrence Livermore National Laboratory This experiment, in collaboration of LLNL, MIT, Univ of Florida, LBNL, Univ of Chicago, FNAL, and INR/Moscow, has been operating with greater than 90% live time since February 1996 with the objective of exploring the region from 0 5 to 1 9 GHz (2 1 to 7 9 ยต<i>eV</i>) at greater than KSVZ sensitivitv In a com~&on paper (E Daw) in these proceedings, the data analysis and Iirst results will be described (See also
Date: August 1, 1998
Creator: Kinion, D
Partner: UNT Libraries Government Documents Department

Gravitational microlensing searches and results

Description: Baryonic matter, in the form of Machos (MAssive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes how surveys for Machos exploit the gravitational microlens magnification of extragalactic stars. The experimental searches for this effect monitor millions of stars, in some cases every night, looking for magnification events. The early results of these surveys indicate that Machos make up a significant fraction of the dark matter in the Milky Way, and that these objects have stellar masses. Truly substellar objects do not contribute much to the total. Additionally, the relatively high event rate towards the Galactic bulge seems to require that the bulge be elongated, and massive.
Date: May 8, 1997
Creator: Alcock, C.
Partner: UNT Libraries Government Documents Department

What is the spectrum of cold dark matter particles on Earth?

Description: It is argued that the spectrum of cold dark matter particles on Earth has peaks in velocity space associated with particles falling onto the Galaxy for the first time and with particles which have fallen in and out of the Galaxy only a small number of times in the past. Estimates are given for the sizes and velocity magnitudes of the first few peaks. The estimates are based on the secondary infall model of halo formation which has been generalized to include the effect of angular momentum.
Date: August 1, 1996
Creator: Sikivie, P.
Partner: UNT Libraries Government Documents Department

Axion overview and the U.S. RF cavity axion search

Description: The axion, a hypothetical elementary particle, originally emerged from a solution to the strong CP problem in QCD. Later, axions were recognized as good dark matter candidates. Dark matter axions have only feeble couplings to matter and radiation, so their detection offers considerable challenge. Nonetheless, a new generation of exquisitely sensitive searches is underway. One such effort, in the United States, has already achieved sensitivity to plausible halo dark matter axion to photon couplings.
Date: January 1, 1998
Creator: Rosenberg, L. J. & van Bibber, K. A.
Partner: UNT Libraries Government Documents Department

Search for MACHOs in the galactic dark matter

Description: Machos (Massive Compact Halo Objects) might be a significant constituent of the dark matter that dominates the Milky Way. (Machos are a form of baryonic dark matter.) This article describes the experimental searches for Machos that exploit the gravitational microlens magnification of extragalactic stars. These surveys monitor millions of stars, in some cases every night, looking for magnification events. The early results from the surveys have yielded some spectacular events. It appears that Machos do comprise a significant fraction of the galactic dark matter. It also appears that the central bar of the Milky Way is very massive.
Date: January 2, 1996
Creator: Alcock, C.
Partner: UNT Libraries Government Documents Department

Searching for MACHOs with microlensing

Description: Baryonic matter, in the form of Machos (Massive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes the experimental searches for Machos that exploit the gravitational microlens magnification of extragalactic stars. These surveys monitor millions of stars, in some cases every night, looking for magnification events. The early results from the surveys have yielded some spectacular events, and pose a significant new puzzle for galactic structure: toward the Large Magellanic Cloud we see fewer events than anticipated for a standard dark halo dominated by Machos, but toward the galactic bulge, the event rate is much higher than anticipated. This is a field of research that is ripe with opportunities for beginning (and senior) scientists.
Date: April 1996
Creator: Alcock, C.
Partner: UNT Libraries Government Documents Department

Optical manipulation of ultrafast electron and nuclear motion on metal surfaces

Description: We study the unoccupied electronic structure and dynamics of chemisorbed atoms and molecules on metal surfaces by time resolved two-photon photoemission (TR-2PP). spectroscopy, low temperature scanning tunneling microscopy (LT-STM), and theory. Our research concerns simple atomic adsorbates such as alkali and alkaline earth atoms, which provide fundamentally important models for adsorbate-surface interactions, and more complex adsorbates such as fullerenes on noble metals, which illustrate emergent interfacial properties that derive from intrinsic molecular attributes, and moleculemolecule and molecule-surface interactions. Our goal is to understand how these interactions contribute to formation of the interfacial electronic structure, and how thus formed electronic properties affect interfacial phenomena of importance to energy transduction and storage. Moreover, we explore how the interfacial electronic excitation drives dynamical phenomena such as charge transfer and surface femtochemistry.
Date: December 2, 2009
Creator: Petek, Hrvoje
Partner: UNT Libraries Government Documents Department