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Articles 3571 - 3600 of 4559
Full-Text Articles in Engineering
Ice Nucleation And Overseeding Of Ice In Volcanic Clouds, Adam J. Durant, R. A. Shaw, William I. Rose, Y. Mi, G. G. J. Ernst
Ice Nucleation And Overseeding Of Ice In Volcanic Clouds, Adam J. Durant, R. A. Shaw, William I. Rose, Y. Mi, G. G. J. Ernst
Department of Geological and Mining Engineering and Sciences Publications
Water is the dominant component of volcanic gas emissions, and water phase transformations, including the formation of ice, can be significant in the dynamics of volcanic clouds. The effectiveness of volcanic ash particles as ice-forming nuclei (IN) is poorly understood and the sparse data that exist for volcanic ash IN have been interpreted in the context of meteorological, rather than volcanic clouds. In this study, single-particle freezing experiments were carried out to investigate the effect of ash particle composition and surface area on water drop freezing temperature. Measured freezing temperatures show only weak correlations with ash IN composition and surface …
Further Results On Frequency-Domain Channel Equalization For Single Carrier Underwater Acoustic Communications, Y. Rosa Zheng, Chengshan Xiao, Xin Liu, Wen-Bin Yang, T. C. Yang
Further Results On Frequency-Domain Channel Equalization For Single Carrier Underwater Acoustic Communications, Y. Rosa Zheng, Chengshan Xiao, Xin Liu, Wen-Bin Yang, T. C. Yang
Electrical and Computer Engineering Faculty Research & Creative Works
A frequency-domain channel equalization and phase correction method was proposed in a previous work published in Oceans'07 conference, in which 10^-4 BER performance was presented for fixed-to-fixed source/receiver channels. The method is improved by using minimum mean square error (MMSE) estimation in channel updates rather than least squares estimation. It is applied to moving-to-fixed channels in the AUVFest'07 ocean experiment where single-carrier wideband transmission was employed with quadrature phase shift keying modulation. The moving source channels exhibit higher Doppler shift and larger Doppler drift than the fixed-to-fixed channels. Therefore, the number of symbols required for initial phase estimation is increased …
High Voltage Charging Of A Capacitor Bank, Sergey I. Shkuratov, Jason Baird, Evgueni F. Talantsev, A. V. Ponomarev, Larry L. Altgilbers
High Voltage Charging Of A Capacitor Bank, Sergey I. Shkuratov, Jason Baird, Evgueni F. Talantsev, A. V. Ponomarev, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
We have demonstrated the feasibility of charging a capacitor bank to a high voltage using an autonomous ultra-compact explosively driven source of prime power. The prime power source is a longitudinally driven shock wave depolarization of a ferroelectric ceramic. The energy-carrying elements of the shock wave ferroelectric generators (FEGs) were poled Pb(Zr52Ti48)O3 polycrystalline ceramic disks with 0.35 cm3 volume. FEGs charged 9 nF, 18 nF, and 36 nF capacitor banks and provided pulsed-power with peak amplitudes up to 0.29 MW. The maximum efficiency of electric charge transfer from shocked Pb(Zr52Ti48)O3 elements to a capacitor bank was 46%. We demonstrated experimentally …
Design And Optimization Of Abrasive Slurry Feed System, Control Circuit And Jet Drilling Tool For Mining Applications,, Pradeep Nambiath
Design And Optimization Of Abrasive Slurry Feed System, Control Circuit And Jet Drilling Tool For Mining Applications,, Pradeep Nambiath
Doctoral Dissertations
"This dissertation focused on an investigation of small diameter hole drilling using abrasive slurry jet (ASJ) technology. The existing ASJ feed systems were reviewed and found inadequate to satisfy the requirements of an ASJ drill. A novel feed system was designed which improved on existing systems by resolving problems with the inability to perform stop/start operations and ensure precise metering of abrasive feed. This system met standards of consistency and evenness of feed required for machining aircraft component parts for Air Force Research Laboratory (AFRL). Theoretical and experimental analysis of the power of an ASJ stream yielded valuable design information …
Design And Evaluation Of A Virtual Reality Training System For New Underground Rockbolters, David Nutakor
Design And Evaluation Of A Virtual Reality Training System For New Underground Rockbolters, David Nutakor
Doctoral Dissertations
"The need for development of better training techniques for underground rock bolters is signified by the fact that a large number of experienced miners (Baby Boomers) will be retiring soon. This means that there will be very little interface time between the new miners and the experienced miners, which could have been used for training the new inexperienced miners. A new generation of workers (Nexters), who have grown up with computers and video games will replace the Baby Boomers, and the most efficient way to introduce them to the safety and health issues of the mining industry is to use …
Development Of A High-Resolution Target Movement Monitoring System For Convergence Monitoring In Mines, Tristan H. Jones
Development Of A High-Resolution Target Movement Monitoring System For Convergence Monitoring In Mines, Tristan H. Jones
Doctoral Dissertations
"The research performed for this dissertation has been conducted with the goal of developing a ground convergence monitor that may better meet the needs of some mines, leading to increased use of ground monitoring programs and reduced fatality rates from falling and sliding rock. The developed monitor is a convergence monitor capable of achieving sensitivities similar to those of currently available convergence meters such as tape extensometers. The monitor is inexpensive and is capable of totally remote operation in some circumstances...A physical model of the meter was developed based on experimental results and compared to a derived theoretical model to …
Mechanics Of Dump Truck Vibrations In High-Impact Shovel Loading Operations, Nassib Aouad
Mechanics Of Dump Truck Vibrations In High-Impact Shovel Loading Operations, Nassib Aouad
Doctoral Dissertations
"The deployment of large machinery for low cost, bulk surface mine production operations has resulted in high-impact shovel loading operations (HISLO). In extreme cases, shovels load large dump trucks with 100-ton (or more) passes generating high-impact forces under gravity. HISLO generates high-frequency shockwaves that cause severe truck vibrations exposing operators to whole body vibrations (WBV). This WBV levels may exceed the recommended International Standards Organization (ISO) limits resulting in longterm lower-back disorders and other health problems. There is a need for fundamental and applied research to determine HISLO vibration levels for heavy mining machinery, their comparisons to ISO 2631 limits …
The Drivers And Barriers To Customer Value Creation: Issues And Prespectives In The Marble Sector Smes Of North-West Frontier Province, Pakistan, Muhammad Noman
The Drivers And Barriers To Customer Value Creation: Issues And Prespectives In The Marble Sector Smes Of North-West Frontier Province, Pakistan, Muhammad Noman
Business Review
The concept of value and, more specifically, customer value is of increasing interest to both academics and practitioners. Many see it as the next source of competitive advantage. Like other regions of the country, the North-West Frontier Province of Pakistan has a presence of SMEs in many sectors. A major one amongst these is the marble sector; characterized by two sub-sectors, marble mining and marble processing. A review of various studies in the marble sector reveals that about 70 percent of marble reserves in Pakistan are being wasted due to poor mining and processing techniques. The situation is further aggravated …
Explosive-Driven Mini-System Based On Shock Wave Ferromagnetic Seed Source And Loop Magnetic Flux Compression Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Explosive-Driven Mini-System Based On Shock Wave Ferromagnetic Seed Source And Loop Magnetic Flux Compression Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
Completely explosive pulsed power mini-systems based on the transverse shock wave ferromagnetic generator (FMG) served as a seed source and loop magnetic flux compression generator (LFCG) as a pulsed power amplifier were proposed, designed, built and tested. The physical principles and design of the developed FMG-LFCG system are described in detail. Experimental data are presented for the explosive operation and electrical performance of the system.
Percussive Penetration Of Unconsolidated Granular Media In A Laboratory Setting, Leslie S. Gertsch
Percussive Penetration Of Unconsolidated Granular Media In A Laboratory Setting, Leslie S. Gertsch
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
This controlled study examined the feasibility of a simple percussive approach to drilling through unconsolidated regolith deposits on Mars. The experiments showed that the approach is feasible at the low power levels and low confining pressures used, and that the rate of impact is more important to the penetration rate than is the mass of the impactor (hammer). More massive impactors tend to lower energy efficiency, as they do in terrestrial pile-driving. Unexpectedly, penetration plotted against applied energy tends to cluster into parallel linear trends. Within a given cluster, penetration is very sensitive to applied energy, while between clusters, the …
Identifying Trends In Underground Coal Mine Incidents Caused By Roof Falls, Cary Cooper
Identifying Trends In Underground Coal Mine Incidents Caused By Roof Falls, Cary Cooper
Opportunities for Undergraduate Research Experience Program (OURE)
Current technology and safety practices generally provide today's underground coal miner with a safe workplace in an unpredictable environment. However, incidents still occur and until the number of incidents resulting in injury or loss of life reaches zero, there will always be room for improving methods and technology used by the modern coal miner. This study analyzes underground coal mine incidents caused by roof falls. Information provided by the Mine Safety and Health Administration (MSHA) was analyzed for trends in factors that contribute to roof fall fatalities in underground coal mines. Identification of major contributing factors will allow for a …
Analysis Of The Holistic Impact Of The Hydrogen Economy On The Coal Industry, Shannon Perry Lusk
Analysis Of The Holistic Impact Of The Hydrogen Economy On The Coal Industry, Shannon Perry Lusk
Doctoral Dissertations
"As gas prices soar and energy demand continues to grow amidst increasingly stringent environmental regulations and an assortment of global pressures, implementing alternative energy sources while considering their linked economic, environmental and societal impacts becomes a more pressing matter. The Hydrogen Economy has been proposed as an answer to meeting the increasing energy demand for electric power generation and transportation in an environmentally benign way. Based on current hydrogen technology development, the most practical feedstock to fuel the Hydrogen Economy may prove to be coal via hydrogen production at FutureGen plants. The planned growth of the currently conceived Hydrogen Economy …
Using Coupled Eulerian And Lagrangian Grids To Model Explosive Interactions With Buildings, Braden Lusk, William P. Schonberg, Jason Baird, Robert S. Woodley, Warren Noll
Using Coupled Eulerian And Lagrangian Grids To Model Explosive Interactions With Buildings, Braden Lusk, William P. Schonberg, Jason Baird, Robert S. Woodley, Warren Noll
Mining Engineering Faculty Research & Creative Works
This paper presents the development of a computational model that can be used to study the interactions between structures and detonating explosives contained within them. This model was developed as part of an effort to develop a rubble characterization model for use in AmmoSIM, an agent based urban tactical decision aid (UTDA) software for weapon-target pairing. The rubble pile created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. The information provided by AmmoSIM will enable both platoon level and command center staff to make informed …
New Concept For Constructing An Autonomous Completely Explosive Pulsed Power System: Transverse Shock Wave Ferromagnetic Primary Power Source And Loop Flux Compression Amplifier, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
New Concept For Constructing An Autonomous Completely Explosive Pulsed Power System: Transverse Shock Wave Ferromagnetic Primary Power Source And Loop Flux Compression Amplifier, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
A new design idea for a compact, autonomous, completely explosive pulsed power system is proposed. The system is based on the shock wave ferromagnetic generator (FMG) as a primary power source and a loop magnetic flux compression generator (LFCG) as a pulsed power amplifier. The FMG primary power source utilizes the effect of transverse shock wave demagnetization of Nd2Fe14B high-energy hard ferromagnets to produce the seed current. Results are presented of an experimental study and digital simulation of operation of the FMG-LFCG system
Transformer-Type Seeding System Of A Helical Fcg Based On A Transverse Shock Wave Ferromagnetic Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Transformer-Type Seeding System Of A Helical Fcg Based On A Transverse Shock Wave Ferromagnetic Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
A new application of the effect of transverse-shock-wave demagnetization of Nd2Fe14B high-energy hard ferromagnets for powering an explosive-driven helical flux compression generator (FCG) is proposed. The novel FCG seeding system based on a compact transverse shock-wave ferromagnetic generator (FMG) containing a 200-cm3 Nd2Fe14B energy-carrying element and a 12 g high explosive charge was designed, constructed, and tested. The proposed design is based on the idea that the wide coaxial single-turn pulse-generating coil of the FMG can simultaneously serve as a seed coil for the FCG. The coaxial single-turn pulse-generating coil of the FMG was wound on the initial part of …
Atmospheric Chemistry Of A 33–34 Hour Old Volcanic Cloud From Hekla Volcano (Iceland): Insights From Direct Sampling And The Application Of Chemical Box Modeling, William I. Rose, Genevieve A. Millard, Tamsin A. Mather, Donald E. Hunton, Bruce Anderson, Clive Oppenheimer, Brett F. Thornton, Terrence M. Gerlach, Albert A. Viggiano, Yutaka Kondo, Thomas M. Miller, John O. Ballenthin
Atmospheric Chemistry Of A 33–34 Hour Old Volcanic Cloud From Hekla Volcano (Iceland): Insights From Direct Sampling And The Application Of Chemical Box Modeling, William I. Rose, Genevieve A. Millard, Tamsin A. Mather, Donald E. Hunton, Bruce Anderson, Clive Oppenheimer, Brett F. Thornton, Terrence M. Gerlach, Albert A. Viggiano, Yutaka Kondo, Thomas M. Miller, John O. Ballenthin
Department of Geological and Mining Engineering and Sciences Publications
On 28 February 2000, a volcanic cloud from Hekla volcano, Iceland, was serendipitously sampled by a DC-8 research aircraft during the SAGE III Ozone Loss and Validation Experiment (SOLVE I). It was encountered at night at 10.4 km above sea level (in the lower stratosphere) and 33–34 hours after emission. The cloud is readily identified by abundant SO2 (≤1 ppmv), HCl (≤70 ppbv), HF (≤60 ppbv), and particles (which may have included fine silicate ash). We compare observed and modeled cloud compositions to understand its chemical evolution. Abundances of sulfur and halogen species indicate some oxidation of sulfur gases but …
Halogen Emissions From A Small Volcanic Eruption: Modeling The Peak Concentrations, Dispersion, And Volcanically Induced Ozone Loss In The Stratosphere, G. A. Millard, T. A. Mather, D. M. Pyle, William I. Rose, B. Thornton
Halogen Emissions From A Small Volcanic Eruption: Modeling The Peak Concentrations, Dispersion, And Volcanically Induced Ozone Loss In The Stratosphere, G. A. Millard, T. A. Mather, D. M. Pyle, William I. Rose, B. Thornton
Department of Geological and Mining Engineering and Sciences Publications
Aircraft measurements in the Hekla, Iceland volcanic plume in February 2000 revealed large quantities of hydrogen halides within the stratosphere correlated to volcanic SO2. Investigation of the longer-term stratospheric impact of these emissions, using the 3D chemical transport model, SLIMCAT suggests that volcanic enhancements of H2O and HNO3 increased HNO3·3H2O particle availability within the plume. These particles activated volcanic HCl and HBr, enhancing model plume concentrations of ClOx (20 ppb) and BrOx (50 ppt). Model O3 concentrations decreased to near-zero in places, and plume average O3 remained 30% lower after two weeks. Reductions in the model O3column reduced UV shielding …
Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll
Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Rubble piles created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. Rubble characteristics must be known, for example, in order to predict the ability of a vehicle to override the collateral damage from weapon effects in urban areas. Two types of models are developed: a first-order model and a first-principles-based model. In both models, we assume complete rubblization of the building and develop a rubble profile model using the size and composition of the collapsed structure to predict the rubble volume. In both cases, this …
Compact Autonomous Explosive-Driven Pulsed Power System Based On A Capacitive Energy Storage Charged By A High-Voltage Shock-Wave Ferromagnetic Generator, S. I. Shkuratov, E. F. Talantsev, Jason Baird, Larry L. Altgilbers, A. H. Stults
Compact Autonomous Explosive-Driven Pulsed Power System Based On A Capacitive Energy Storage Charged By A High-Voltage Shock-Wave Ferromagnetic Generator, S. I. Shkuratov, E. F. Talantsev, Jason Baird, Larry L. Altgilbers, A. H. Stults
Mining Engineering Faculty Research & Creative Works
A new concept for constructing compact autonomous pulsed power systems is presented. This concept utilizes a high-voltage explosive-driven shock-wave ferromagnetic generator (FMG) as a charging source for capacitive energy storage. It has been experimentally demonstrated that miniature FMGs (22-25 cm³ in size and 84-95 g in mass) developed for these experiments can be successfully used to charge capacitor banks. The FMGs, containing Nd₂Fe₁₄B energy-carrying elements, provided pulsed powers of 35-45 kW in times ranging from 10 to 15 µs. A methodology was developed for digital simulation of the operation of the transverse FMG. Experimental results that were obtained are in …
Imperative Of National Savings: A Case For Adoption Of Appropriate Benchmark Price For Crude Oil., Moses F. Otu
Imperative Of National Savings: A Case For Adoption Of Appropriate Benchmark Price For Crude Oil., Moses F. Otu
Bullion
Budgeting involves the design of plans that aligns expected financial resources and expenditure to accomplish specific national goals and objectives. It is in this regard that this paper provides a simple framework for deriving an acceptable bench-mark price for crude oil for budgeting purposes. This is aimed at enabling the elimination of subjectivity in budgeting process and promote understanding between all the stakeholders in order to fast track the process of passage of the appropriation bill. Following a brief introduction, the paper examines the need for national saving fund and constitutional provisions for national savings. Section three focuses on the …
Sustainable Mining: Trends And Opportunities, James L. Hendrix
Sustainable Mining: Trends And Opportunities, James L. Hendrix
Papers in Sustainable Mining
Sustainable development integrates economic, environmental and social considerations in order to improve the lives of the current generation and ensure that future generations will have adequate resources and opportunities. Sustainable mining is not a new approach or concept in resource consumption. It is a holistic approach for dealing with a complex, interlinked set of factors that determine the net societal worth of a project. A holistic approach to phosphate beneficiation gives us opportunities for the improvement of economic results through reactant and waste minimization. It also gives direction for continued research thrusts to solve the problems associated with the clay …
Effect Of Water Ice Content On Excavatability Of Lunar Regolith, Leslie S. Gertsch, Robert Gustafson, Richard E. Gertsch
Effect Of Water Ice Content On Excavatability Of Lunar Regolith, Leslie S. Gertsch, Robert Gustafson, Richard E. Gertsch
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The amount of water ice contained within prepared samples of JSC-1 lunar regolith simulant strongly affects the excavatability of the material. As part of a NASA Phase I SBIR project, load-penetration testing of JSC-1 lunar regolith simulant was performed at water ice concentrations ranging from zero to 11% by mass (approximately saturated), after compaction and cooling to simulate probable lunar conditions. After mixing dry JSC-1 simulant with the appropriate amount of water, the samples were individually compressed into containment rings under 48 MPa of pressure. Thermocouples embedded in the samples monitored internal temperature while they were cooled in a bath …
Pulse Charging Of Capacitor Bank By Explosive-Driven Shock Wave Ferroelectric Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Pulse Charging Of Capacitor Bank By Explosive-Driven Shock Wave Ferroelectric Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Allen H. Stults, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
Ultracompact explosive-driven shock wave ferroelectric generators (FEGs) were used as autonomous primary power sources for charging capacitor banks of different capacitance. The FEGs utilized longitudinal (when the shock wave propagates along the polarization vector P) shock wave depolarization of Pb(Zr52Ti48)O3 (PZT) polycrystalline ferroelectric ceramic. PZT disks having diameters ranging from 25 to 27 mm and three different thicknesses: 0.65, 2.1, and 5.1 mm. It was experimentally shown that during the charging process the FEGs were capable of producing pulsed power with peak amplitudes up to 0.3 MW. Results for charging voltage, electric charge transfer and …
Mapping Ground Conditions Before The Development Of An Underground Hard Rock Mine - Mcarthur River Uranium Mine Case Study, Derek Apel, P. Szmigiel
Mapping Ground Conditions Before The Development Of An Underground Hard Rock Mine - Mcarthur River Uranium Mine Case Study, Derek Apel, P. Szmigiel
Mining Engineering Faculty Research & Creative Works
No abstract provided.
System For Heating Bulk Materials, Nassib Aouad, J. Kennedy
System For Heating Bulk Materials, Nassib Aouad, J. Kennedy
Mining Engineering Faculty Research & Creative Works
A system for heating bulk material to remove moisture. The system includes a heat exchanger system in the floor of a bin for receiving moist bulk material. The heat exchanger system is capable of withstanding the weight of the bulk material as well as being stable for the dynamic process of loading and discharging the bulk material. The heat exchanger includes a plurality of spaced beams mounted between a top plate and bottom plate. The spaced beams form conduits for receiving water or other fluids that have been heated by a stove capable of burning wood, coal, biomass material or …
Completely Explosive Autonomous High-Voltage Pulsed-Power System Based On Shockwave Ferromagnetic Primary Power Source And Spiral Vector Inversion Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Millard F. Rose, Zachary Shotts, Z. Roberts, Allen H. Stults, Larry L. Altgilbers
Completely Explosive Autonomous High-Voltage Pulsed-Power System Based On Shockwave Ferromagnetic Primary Power Source And Spiral Vector Inversion Generator, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Millard F. Rose, Zachary Shotts, Z. Roberts, Allen H. Stults, Larry L. Altgilbers
Mining Engineering Faculty Research & Creative Works
Novel explosive and conventional pulsed-power technologies were combined, and a series of explosive-driven high-voltage power supplies was designed, built, and tested. The power supply contained an explosive-driven high-voltage primary power source based on the fundamental physical effect of shockwave demagnetization of Nd2 Fe14B high-energy ferromagnet and a power-conditioning stage. The volume of the energy-carrying ferromagnetic elements in the shockwave ferromagnetic generators (FMGs) was 8.75 cm3. The power-conditioning stage was based on the spiral vector inversion generator (VIG). The combined FMG-VIG system demonstrated successful operation and good performance. The output-voltage pulse amplitude of the combined FMG-VIG …
Electrostatic Active Radiation Shielding -- Revisited, John W. Wilson, R. K. Tripathi, R. C. Youngquist
Electrostatic Active Radiation Shielding -- Revisited, John W. Wilson, R. K. Tripathi, R. C. Youngquist
Mining Engineering Faculty Research & Creative Works
For the success of NASA's new vision for space exploration to Moon, Mars and beyond, exposures from the hazards of severe space radiation in deep space long duration missions is ''a must solve'' problem The payload penalty demands a very stringent requirement on the design of the spacecrafts for human deep space missions. Langley has developed state-of-the-art radiation protection and shielding technology for space missions. The exploration beyond low Earth orbit (LEO) to enable routine access to space require protection from the hazards of the accumulated exposures of space radiation, galactic cosmic rays (GCR) and solar particle events (SPE), and …
Longitudinal Shock Wave Depolarization Of Pb(Zr₅₂Ti₄₈)O₃ Polycrystalline Ferroelectrics And Their Utilization In Explosive Pulsed Power, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Henryk Temkin, Larry L. Altgilbers, Allen H. Stults
Longitudinal Shock Wave Depolarization Of Pb(Zr₅₂Ti₄₈)O₃ Polycrystalline Ferroelectrics And Their Utilization In Explosive Pulsed Power, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Henryk Temkin, Larry L. Altgilbers, Allen H. Stults
Mining Engineering Faculty Research & Creative Works
A poled lead zirconate titanate Pb(Zr52Ti48)O3 (PZT) polycrystalline piezoelectric ceramic energy-carrying element of a compact explosive-driven power generator was subjected to a longitudinal explosive shock wave (the wave front traveled along the polarization vector P0). The shock compression of the element at pressures of 1.5-3.8 GPa caused almost complete depolarization of the sample. Shock wave velocity in the PZT was determined to be 3.94 ± 0.27 km/s. The electric charge stored in a ferroelectric, due to its remnant polarization, is released during a short time interval and can be transformed into pulsed power. Compact explosive-driven power sources utilizing longitudinal shock …
Completely Explosive Ultracompact High-Voltage Nanosecond Pulse-Generating System, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Millard F. Rose, Zachary Shotts, Larry L. Altgilbers, Allen H. Stults
Completely Explosive Ultracompact High-Voltage Nanosecond Pulse-Generating System, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Millard F. Rose, Zachary Shotts, Larry L. Altgilbers, Allen H. Stults
Mining Engineering Faculty Research & Creative Works
A conventional pulsed power technology has been combined with an explosive pulsed power technology to produce an autonomous high-voltage power supply. The power supply contained an explosive-driven high-voltage primary power source and a power-conditioning stage. The ultracompact explosive-driven primary power source was based on the physical effect of shock-wave depolarization of high-energy Pb(Zr52Ti48)O3 ferroelectric material. The volume of the energy-carrying ferroelectric elements in the shock-wave ferroelectric generators (SWFEGs) varied from 1.2 to 2.6 cm3. The power-conditioning stage was based on the spiral vector inversion generator (VIG). The SWFEG-VIG system demonstrated successful operation and good performance. The amplitude of the output …
Transverse Explosive Shock-Wave Compression Of Nd₂Fe₁₄B High-Energy Hard Ferromagnets: Induced Magnetic Phase Transition, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Larry L. Altgilbers, Allen H. Stults
Transverse Explosive Shock-Wave Compression Of Nd₂Fe₁₄B High-Energy Hard Ferromagnets: Induced Magnetic Phase Transition, Sergey I. Shkuratov, Evgueni F. Talantsev, Jason Baird, Larry L. Altgilbers, Allen H. Stults
Mining Engineering Faculty Research & Creative Works
Investigations of the magnetic phase state of Nd2Fe14B high-energy hard ferromagnets under the action of an explosive shock wave traveling across the magnetization vector, M, have been performed. We demonstrate that the transverse shock-wave compression of an Nd2Fe14B hard ferromagnet with pressure at the shock wave front of P = 22.3 GPa causes a hard ferromagnet — to — weak magnet phase transition. Due to this phase transition, the magnetostatic energy stored for an indefinite period of time in the Nd2Fe14B ferromagnet is released within a short time interval and can be transformed into pulsed primary power. Based on this …