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27,400 Matching Results
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Geothermal resources: exploration and exploitation. A bibliography
This comprehensive bibliography contains 5476 citations of foreign and domestic research reports, journal articles, patents, conference proceedings, and books concerned with the exploration and exploitation of geothermal resources. The coverage dates back as far as useful references could be obtained and extends through June 1976. References are arranged in broad subject categories and are made up of complete bibliographic citations. These are followed by a listing of subject descriptors used to describe the subject content of each reference. Four indexes are included: Corporate, Personal Author, Subject, and Report Number. Also included is a list of journals from which articles were selected. (LBS)
Date:
July 1, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Environmental Philosophy and the Ethics of Terraforming Mars: Adding the Voices of Environmental Justice and Ecofeminism to the Ongoing Debate
Questions concerning the ethics of terraforming Mars have received some attention from both philosophers and scientists during recent decades. A variety of theoretical approaches have been supplied by a number of authors, however research pursuant to this thesis has indicated at least two major blindspots in the published literature on the topic. First, a broad category of human considerations involving risks, dangers, and social, political, and economic inequalities that would likely be associated with efforts to terraform Mars have been woefully overlooked in the published literature to date. I attempt to rectify that oversight by employing the interpretive lens of environmental justice to address questions of environmental colonialism, equality in terms of political participation and inclusion in decision making structures, risks associated with technological progressivism, and responses to anthropogenic climate change. Only by including the historically marginalized and politically disenfranchised "voices," of both humans and nonhumans, can any future plan to terraform Mars be deemed ethical, moral or just according to the framework provided by environmental justice. Furthermore, broader political inclusion of this sort conforms to what ecofeminist author Val Plumwood calls the "intentional recognition stance" and provides an avenue through which globally societies can include nonanthropocentric considerations in decision …
Date:
August 2013
Creator:
French, Robert Heath
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Power beaming: Mission enabling for lunar exploration
This paper explores several beam power concepts proposed for powering either lunar base or rover vehicles. At present, power requirements to support lunar exploration activity are met by integral self-contained power system designs. To provide requisite energy flexibility for human expansion into space, an innovative approach to replace on-board self-contained power systems is needed. Power beaming provides an alternative approach to supplying power that would ensure increased mission flexibility while reducing total mass launched into space. Providing power to the moon presents significant design challenges because of the duration of the lunar night. Power beaming provides an alternative to solar photovoltaic systems coupled with battery storage, radioisotope thermoelectric generation, and surface nuclear power. The Synthesis Group describes power beaming as a technology supporting lunar exploration. In this analysis beam power designs are compared to conventional power generation methods.
Date:
January 1, 1992
Creator:
Bamberger, J. A.
Object Type:
Article
System:
The UNT Digital Library
SURFACE GEOPHYSICAL EXPLORATION - COMPENDIUM DOCUMENT
This report documents the evolution of the surface geophysical exploration (SGE) program and highlights some of the most recent successes in imaging conductive targets related to past leaks within and around Hanford's tank farms. While it is noted that the SGE program consists of multiple geophysical techniques designed to (1) locate near surface infrastructure that may interfere with (2) subsurface plume mapping, the report will focus primarily on electrical resistivity acquisition and processing for plume mapping. Due to the interferences from the near surface piping network, tanks, fences, wells, etc., the results of the three-dimensional (3D) reconstruction of electrical resistivity was more representative of metal than the high ionic strength plumes. Since the first deployment, the focus of the SGE program has been to acquire and model the best electrical resistivity data that minimizes the influence of buried metal objects. Toward that goal, two significant advances have occurred: (1) using the infrastructure directly in the acquisition campaign and (2) placement of electrodes beneath the infrastructure. The direct use of infrastructure was successfully demonstrated at T farm by using wells as long electrodes (Rucker et al., 2010, 'Electrical-Resistivity Characterization of an Industrial Site Using Long Electrodes'). While the method was capable …
Date:
October 4, 2011
Creator:
Rucker, D. F. & Myers, D. A.
Object Type:
Report
System:
The UNT Digital Library
Development of a propulsion system and component test facility for advanced radioisotope powered Mars Hopper platforms
Verification and validation of design and modeling activities for radioisotope powered Mars Hopper platforms undertaken at the Center for Space Nuclear Research is essential for proof of concept. Previous research at the center has driven the selection of advanced material combinations; some of which require specialized handling capabilities. The development of a closed and contained test facility to forward this research is discussed within this paper.
Date:
February 1, 2011
Creator:
O'Brien, Robert C.; Jerred, Nathan D. & Howe, Steven D.
Object Type:
Article
System:
The UNT Digital Library
Benchmarking Heavy Ion Transport Codes FLUKA, HETC-HEDS MARS15, MCNPX, and PHITS
Powerful accelerators such as spallation neutron sources, muon-collider/neutrino facilities, and rare isotope beam facilities must be designed with the consideration that they handle the beam power reliably and safely, and they must be optimized to yield maximum performance relative to their design requirements. The simulation codes used for design purposes must produce reliable results. If not, component and facility designs can become costly, have limited lifetime and usefulness, and could even be unsafe. The objective of this proposal is to assess the performance of the currently available codes â PHITS, FLUKA, MARS15, MCNPX, and HETC-HEDS â that could be used for design simulations involving heavy ion transport. We plan to access their performance by performing simulations and comparing results against experimental data of benchmark quality. Quantitative knowledge of the biases and the uncertainties of the simulations is essential as this potentially impacts the safe, reliable and cost effective design of any future radioactive ion beam facility. Further benchmarking of heavy-ion transport codes was one of the actions recommended in the âÂÂReport of the 2003 RIA R&D Workshop".
Date:
June 7, 2013
Creator:
Ronningen, Reginald Martin; Remec, Igor & Heilbronn, Lawrence H.
Object Type:
Report
System:
The UNT Digital Library
Development and testing of laser-induced breakdown spectroscopy for the Mars Rover Program : elemental analysis at stand-off distances
One of the most Fundamental pieces of information about any planetary body is the elemental cornposition of its surface materials. The Viking Martian landers employed XRF (x-ray fluorescence) and the MER rovers are carrying APXS (alpha-proton x-ray spectrometer) instruments upgraded from that used on the Pathfinder rover to supply elemental composition information for soils and rocks for which direct contact is possible. These in-situ analyses require that the lander or rover be in contact with the sample
Date:
January 1, 2003
Creator:
Cremers, D. A. (David A.); Wiens, R. C. (Roger C.); Arp, Z. A. (Zane A.); Harris, R. D. (Ronny D.) & Maurice, S. (Sylvestre)
Object Type:
Article
System:
The UNT Digital Library
An integrated mission planning approach for the Space Exploration Initiative
This report discusses a fully integrated energy-based approach to mission planning which is needed if the Space Exploration Initiative (SEI) is to succeed. Such an approach would reduce the number of new systems and technologies requiring development. The resultant horizontal commonality of systems and hardware would reduce the direct economic impact of SEI and provide an economic benefit by greatly enhancing our international technical competitiveness through technology spin-offs and through the resulting early return on investment. Integrated planning and close interagency cooperation must occur if the SEI is to achieve its goal of expanding the human presence into the solar system and be an affordable endeavor. An energy-based mission planning approach gives each mission planner the needed power, yet preserves the individuality of mission requirements and objectives while reducing the concessions mission planners must make. This approach may even expand the mission options available and enhance mission activities.
Date:
August 1, 1992
Creator:
Coomes, E. P.; Dagle, J. E.; Bamberger, J. A. & Noffsinger, K. E.
Object Type:
Article
System:
The UNT Digital Library
An Integrated Mission Planning Approach for the Space Exploration Initiative
This report discusses a fully integrated energy-based approach to mission planning which is needed if the Space Exploration Initiative (SEI) is to succeed. Such an approach would reduce the number of new systems and technologies requiring development. The resultant horizontal commonality of systems and hardware would reduce the direct economic impact of SEI and provide an economic benefit by greatly enhancing our international technical competitiveness through technology spin-offs and through the resulting early return on investment. Integrated planning and close interagency cooperation must occur if the SEI is to achieve its goal of expanding the human presence into the solar system and be an affordable endeavor. An energy-based mission planning approach gives each mission planner the needed power, yet preserves the individuality of mission requirements and objectives while reducing the concessions mission planners must make. This approach may even expand the mission options available and enhance mission activities.
Date:
August 1, 1992
Creator:
Coomes, E. P.; Dagle, J. E.; Bamberger, J. A. & Noffsinger, K. E.
Object Type:
Article
System:
The UNT Digital Library
Small Body Exploration Technologies as Precursors for Interstellar Robotics
The scientific activities undertaken to explore our Solar System will be the same as required someday at other stars. The systematic exploration of primitive small bodies throughout our Solar System requires new technologies for autonomous robotic spacecraft. These diverse celestial bodies contain clues to the early stages of the Solar System's evolution as well as information about the origin and transport of water-rich and organic material, the essential building blocks for life. They will be among the first objects studied at distant star systems. The technologies developed to address small body and outer planet exploration will form much of the technical basis for designing interstellar robotic explorers. The Small Bodies Assessment Group, which reports to NASA, initiated a Technology Forum in 2011 that brought together scientists and technologists to discuss the needs and opportunities for small body robotic exploration in the Solar System. Presentations and discussions occurred in the areas of mission and spacecraft design, electric power, propulsion, avionics, communications, autonomous navigation, remote sensing and surface instruments, sampling, intelligent event recognition, and command and sequencing software. In this paper, the major technology themes from the Technology Forum are reviewed, and suggestions are made for developments that will have the largest …
Date:
February 15, 2012
Creator:
Noble, Robert & Sykes, Mark V.
Object Type:
Article
System:
The UNT Digital Library
A Journey to Inspire, Innovate, and Discover
On January 14, 2004, President George W. Bush announced a new vision for America’s civil space program that calls for human and robotic missions to the Moon, Mars, and beyond. This vision set forth goals of: returning the Space Shuttle safely to flight; completing the International Space Station (ISS); phasing out the Space Shuttle when the ISS is complete (about 2010); sending a robotic orbiter and lander to the Moon; sending a human expedition to the Moon as early as 2015, but no later than 2020; conducting robotic missions to Mars in preparation for a future human expedition; and conducting robotic exploration across the solar system. Such a focus for the American space program has not existed since the Apollo era and establishes a much-needed direction and purpose for our national space efforts. The Commission sought extensive input for their deliberations, from within the U.S. government and directly from the public in the United States and abroad. The Commission held five televised public hearings, meeting in: Washington, D.C.; Dayton, Ohio; Atlanta, Georgia; San Francisco, California; and New York City. The Commission heard public testimony from 96 individuals representing academia, industry, media, teachers, students, entrepreneurs, astronauts, labor unions, state governments, federal …
Date:
June 2014
Creator:
United States. President's Commission on Implementation of United States Space Exploration Policy.
Object Type:
Report
System:
The UNT Digital Library
Exploring Functional Interdependence of Mands, Tacts, and Intraverbals after Brain Injury
One goal of this study was to evaluate the emergence of mands and intraverbals following tact acquisition for individuals with aphasia due to acquired brain injury. A second goal was to evaluate the transfer of shortened latencies as a function of tact training across untrained operants. In Study 1, the dependent measure was accuracy of responding and in Study 2, the dependent measures were rate and latency of responding. Participants for Study 1 were two uninjured adults (pilot) and two adults with brain injury (ABI). Both sets of participants were directly taught to tact up to 6 stimuli. Once tacts were acquired, the response forms were assessed under mand and intraverbal conditions. All pilot participants and one ABI participant showed mand transfer for all stimuli. Tact to intraverbal transfer varied across participants. One adult with brain injury served as a participant for Study 2. Fluency training was used to teach tacts for 15 stimuli. Response latencies were gathered for all operants before and after training. The participant met the designated aim (rate of responding) and showed a decrease in latencies for tacts and untrained intraverbals. Changes in mand latencies varied. Fluency gains showed partial retention. Results from Study 1 provide …
Date:
August 2022
Creator:
Baltazar-Mars, Marla
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Mirror Advanced Reactor Study (MARS). Final report. Volume 1-A. Commercial fusion electric plant
Volume 1-A contains the following chapters: (1) plasma engineering, (2) magnets, (3) ecr heating systems, (4) anchor ion-cyclotron resonance heating system, (5) sloshing ion neutral beam, (6) end cell structure, (7) end plasma technology, (8) fueling, (9) startup ion cyclotron resonant heating systems, and (10) end cell radiation analysis. (MOW)
Date:
July 1, 1984
Creator:
Donohue, M.L. & Price, M.E. (eds.)
Object Type:
Report
System:
The UNT Digital Library
Safety questions relevant to nuclear thermal propulsion
Nuclear propulsion is necessary for successful Mars exploration to enhance crew safety and reduce mission costs. Safety concerns are considered by some to be an implements to the use of nuclear thermal rockets for these missions. Therefore, an assessment was made of the various types of possible accident conditions that might occur and whether design or operational solutions exist. With the previous work on the NERVA nuclear rocket, most of the issues have been addressed in some detail. Thus, a large data base exist to use in an agreement. The assessment includes evaluating both ground, launch, space operations and disposal conditions. The conclusion is that design and operational solutions do exist for the safe use of nuclear thermal rockets and that both the environment and crews be protected against harmful radiation. Further, it is concluded that the use of nuclear thermal propulsion will reduce the radiation and mission risks to the Mars crews.
Date:
October 15, 1991
Creator:
Buden, D.
Object Type:
Article
System:
The UNT Digital Library
America at the threshold. [Contains bibliography]
On the 20th anniversary of the first lunar landing mission, Apollo 11, President Bush outlined a program that would put the United States on an aggressive track to return to the Moon to stay, and to land humans on Mars. The president's space policy calls for expanding human presence an activity beyond Earth orbit into the Solar System; obtaining scientific, technological and economic benefits for the American people; encouraging private sector participation in space; improving the quality of life on the Earth; strengthening national security; and promoting international cooperation in space. The Space Exploration Initiative accomplishes these goals. In August 1989, NASA began an extensive review to summarize the technology and strategies for going back to the Moon and on to Mars. To obtain the final objective, major topical activities were defined. These activities were incremental capabilities to be achieved to fulfill the national space vision. They include: (1) moon waypoints (lunar exploration; preparation for mars; habitation; lunar based observation; fuels; energy to earth); (2) asteroids waypoints; and (3) mars waypoints. The six national space vision are (1) to increase our knowledge of solar system and beyond; (2) to rejuvenate interest in Science and engineering; (3) to refocus the US …
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The 3rd Dimension of Planetary Exploration - Deep Subsurface Sampling
None
Date:
September 20, 2000
Creator:
Blacic, James D.; Dreesen, Donald S. & Mockler, Theodore T.
Object Type:
Article
System:
The UNT Digital Library
Mini-satellite exploration of very near earth space fuel objects
A prospecting plan is presented to assay near Earth objects (NEO) for their potential to yield rocket fuel. The plan calls out small satellites as the near-term means to achieve low cost surveys and deep subsurface sampling of NEO composition. The water bearing classes of NEO to be considered are limited to those accessible in short time and with small thrusters. These include the water bearing clay objects (phylosilicates) at nearly trivial distances from Earth, and the recently identified water ice objects such as comet ({number_sign}4015) 1979 VA. These objects are evaluated as small satellite prospecting and assay vehicle targets.
Date:
September 19, 1992
Creator:
Zuppero, A. C. & Jacox, M. G.
Object Type:
Article
System:
The UNT Digital Library
Mini-satellite exploration of very near earth space fuel objects
A prospecting plan is presented to assay near Earth objects (NEO) for their potential to yield rocket fuel. The plan calls out small satellites as the near-term means to achieve low cost surveys and deep subsurface sampling of NEO composition. The water bearing classes of NEO to be considered are limited to those accessible in short time and with small thrusters. These include the water bearing clay objects (phylosilicates) at nearly trivial distances from Earth, and the recently identified water ice objects such as comet ([number sign]4015) 1979 VA. These objects are evaluated as small satellite prospecting and assay vehicle targets.
Date:
September 19, 1992
Creator:
Zuppero, A. C. & Jacox, M. G.
Object Type:
Article
System:
The UNT Digital Library
History of Coastal Alabama Natural Gas Exploration and Development: Final Report
This report tracks the history of the coastal region of Alabama following interest in oil drilling from 1969 to 1997. Mobil Oil Company sought to lease tracts to drill for oil in Mobile Bay from the state of Alabama, and later the oil companies Exxon, Chevron, and Shell became a part of the competition in the area.
Date:
April 1999
Creator:
Wade, William W.; Plater, Jason R. & Kelley, Jacqueline Q.
Object Type:
Text
System:
The UNT Digital Library
Nuclear effects group program for Fiscal Year 1963
This report provides a summary of the Nuclear Effects Group Program for fiscal year 1963. Efforts in space physics and instrumentation are detailed for the space exploration effort. Pinex type experiments are proposed, as are Phonex, Nuclear Emulsion Research and Low Energy X-Rays Measurements projects.
Date:
March 1, 1962
Creator:
Gilbert, F. C.
Object Type:
Report
System:
The UNT Digital Library
Small space reactor power systems for unmanned solar system exploration missions
A preliminary feasibility study of the application of small nuclear reactor space power systems to the Mariner Mark II Cassini spacecraft/mission was conducted. The purpose of the study was to identify and assess the technology and performance issues associated with the reactor power system/spacecraft/mission integration. The Cassini mission was selected because study of the Saturn system was identified as a high priority outer planet exploration objective. Reactor power systems applied to this mission were evaluated for two different uses. First, a very small 1 kWe reactor power system was used as an RTG replacement for the nominal spacecraft mission science payload power requirements while still retaining the spacecraft's usual bipropellant chemical propulsion system. The second use of reactor power involved the additional replacement of the chemical propulsion system with a small reactor power system and an electric propulsion system. The study also provides an examination of potential applications for the additional power available for scientific data collection. The reactor power system characteristics utilized in the study were based on a parametric mass model that was developed specifically for these low power applications. The model was generated following a neutronic safety and operational feasibility assessment of six small reactor concepts solicited …
Date:
December 1, 1987
Creator:
Bloomfield, H. S.
Object Type:
Report
System:
The UNT Digital Library
Environmental assessment for geothermal loan guarantee: South Brawley geothermal exploration project
The foregoing analysis indicates that the proposed geothermal field experiment could result in several adverse environmental effects. Such effects would lie primarily in the areas of air quality, noise, aesthetics, land use, and water consumption. However, for the most part, mitigating measures have been, or easily could be, included in project plans to reduce these adverse effects to insignificant levels. Those aspects of the project which are not completely amenable to mitigation by any reasonable means include air quality, noise, aesthetics, land use and water use.
Date:
November 1, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Neutron sensors for locating sites of planetary water deposits
This is the final report of a six-month, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This project helped in exploration of the value and feasibility of use of collimated neutron detection methods for improving the sensitivity of neutron spectrometers specifically designed for deep-space missions to detect and identify both present-day deposits of near-surface water ice. The authors believed that this result helped enable a decision to include a Los Alamos-designed neutron sensor as a component of the NASA Mars Global Surveyor-01 Gamma-Ray/Neutron Spectrometer.
Date:
December 31, 1998
Creator:
Feldman, William C.; Fenimore, Edward E.; Byrd, Roger C. & Wiens, Roger C.
Object Type:
Report
System:
The UNT Digital Library
SNAP 19 RTG FOR VIKING LANDER SYSTEM. First Semiannual Progress Report, January 1--June 30, 1972.
None
Date:
January 1, 1972
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library