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Articles 4891 - 4920 of 5380
Full-Text Articles in Materials Science and Engineering
An Optically Controlled Closing And Opening Semiconductor Switch, K. H. Schoenbach, V. K. Lakdawala, R. Germer, S. T. Ko
An Optically Controlled Closing And Opening Semiconductor Switch, K. H. Schoenbach, V. K. Lakdawala, R. Germer, S. T. Ko
Electrical & Computer Engineering Faculty Publications
A concept for a bulk semiconductor switch is presented, where the conductivity is increased and reduced, respectively, through illumination with light of different wavelengths. The increase in conductivity is accomplished by electron ionization from deep centers and generation of bound holes. The reduction of conductivity is obtained by hole ionization from the excited centers and subsequent recombination of free electrons and holes. The transient behavior of electron and hole density in a high power semiconductor (GaAs:Cu) switch is computed by means of a rate equation model. Changes in conductivity by five orders of magnitude can be obtained.
Ion Exchange Properties Of Titania Gels Prepared From Titanous Chloride And Amonium Carbonate, Nahed Latif Yacoub
Ion Exchange Properties Of Titania Gels Prepared From Titanous Chloride And Amonium Carbonate, Nahed Latif Yacoub
Archived Theses and Dissertations
No abstract provided.
29th Rocky Mountain Conference
29th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 29th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 2-6, 1987.
The Effect Of Thermal History On Modes Of Formation Of Borate Glasses Containing Titanium, Shahinaz Abd El Rahman Imam
The Effect Of Thermal History On Modes Of Formation Of Borate Glasses Containing Titanium, Shahinaz Abd El Rahman Imam
Archived Theses and Dissertations
No abstract provided.
28th Rocky Mountain Conference
28th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 28th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 3-7, 1986.
27th Rocky Mountain Conference
27th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 27th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, July 14-18, 1985.
Electronic Absorption Spectra Of Ni (Ii) In Sodium Phosphate And Sodium Fluorophosphate Glasses, Tarek Mostafa Sami Genena
Electronic Absorption Spectra Of Ni (Ii) In Sodium Phosphate And Sodium Fluorophosphate Glasses, Tarek Mostafa Sami Genena
Archived Theses and Dissertations
No abstract provided.
Ion-Exchange And Surface Properties Of Titania Gels From Ti (111) Chloride Solutions, Suzan I Khairy Seleem
Ion-Exchange And Surface Properties Of Titania Gels From Ti (111) Chloride Solutions, Suzan I Khairy Seleem
Archived Theses and Dissertations
No abstract provided.
Evaluation Of Low Temperature Properties Of Gas Oil, Dina Atef Abd El Ghaffar
Evaluation Of Low Temperature Properties Of Gas Oil, Dina Atef Abd El Ghaffar
Archived Theses and Dissertations
No abstract provided.
26th Rocky Mountain Conference
26th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 26th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 7-8, 1984.
Assessment Of The Accuracy Of Metal Cutting In A Microcomputer Controlled Machine, Aly Mohamed Saad Ed-Din Dars
Assessment Of The Accuracy Of Metal Cutting In A Microcomputer Controlled Machine, Aly Mohamed Saad Ed-Din Dars
Archived Theses and Dissertations
No abstract provided.
Non-Linear Oscillation, Automodulation And Anelasticity, Tetsuro Suzuki, Manfred Wuttig
Non-Linear Oscillation, Automodulation And Anelasticity, Tetsuro Suzuki, Manfred Wuttig
Physics Faculty Research & Creative Works
The auto modulation observed in the course of internal friction is discussed as a special example of the universal nature of non-linear oscillations. Universal features of non-linear oscillations are the requirement of energy supply or negative damping and the period doubling route to chaos. The negative damping responsible for the auto modulation is described in terms of the soliton model for twinning deformation. © 1984 The Japan Society of Applied Physics.
25th Rocky Mountain Conference
25th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Abstracts and meeting program from the 25th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 14-17, 1983.
Nonlinear Anelasticity Of Magnesium, Alexander Aning, Tetsuro Suzuki, Manfred Wuttig
Nonlinear Anelasticity Of Magnesium, Alexander Aning, Tetsuro Suzuki, Manfred Wuttig
Physics Faculty Research & Creative Works
An approximate solution of the equation of motion of a nonlinear anelastic reed at or near resonance is presented. The steady state solution reproduces the well-known nonlinear resonances. The solution also predicts the existence of auto modulations, i.e., self-excited modulations of the amplitude and phase at constant power of excitation of the reed. Numerical examples of such auto modulations are presented for an antisymmetric deformation potential. Experimental studies of finite amplitude oscillations of a magnesium reed vibrating at 72 and 431 Hz at room temperature confirm the existence of auto modulations. The experimental results can be semi quantitatively described in …
24th Rocky Mountain Conference
24th Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Abstracts and meeting program from the 24th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 1-5, 1982.
Measurement Of The Wear Properties Of Metallic Solids With A Falex Lubricant Testing Machine, Edward Boyd Hale, Chun-Ping John Meng, Ronald A. Kohser
Measurement Of The Wear Properties Of Metallic Solids With A Falex Lubricant Testing Machine, Edward Boyd Hale, Chun-Ping John Meng, Ronald A. Kohser
Physics Faculty Research & Creative Works
A modified Falex Lubricant Testing Machine has been used to determine wear properties of metallic solids. In particular, wear mass loss, wear volume loss, wear rates, and other parameters have been determined for a basic steel, as heat treated and after ion implantation. Wear rate improvements of more than an order of magnitude were found in a nickel-chrome steel (SAE 3135) implanted with 2.5x1017 N+2/cm2. Wear tests were conducted with a cylinder-in-groove geometry in a mild lubricating oil with loads greater than 540 N, which corresponded to pressures which exceeded 108N/m2 …
Phaseautomodulation In Magnesium, Alexander Aning, Tetsuro Suzuki, Manfred Wuttig
Phaseautomodulation In Magnesium, Alexander Aning, Tetsuro Suzuki, Manfred Wuttig
Physics Faculty Research & Creative Works
No abstract provided.
Suitability Of Egyptian Raw Materials For The Production Of Cement Clinker Using The Dry Process, Lamia Rifaat Ismail
Suitability Of Egyptian Raw Materials For The Production Of Cement Clinker Using The Dry Process, Lamia Rifaat Ismail
Archived Theses and Dissertations
No abstract provided.
The Influence Of Halloysite Content On The Shear Strength Of Kaolinite, Reka Katalin Gabor
The Influence Of Halloysite Content On The Shear Strength Of Kaolinite, Reka Katalin Gabor
Dissertations and Theses
The objective of this thesis is to determine the relative shear strengths of halloysite, kaolinite, synthetic mixtures, and local soils, to investigate the influence of halloysite content on the shear strength of kaolinite, and to explore the possibility that the strength properties of soil clays might be controlled by the relative content of their component minerals.
23rd Rocky Mountain Conference
23rd Rocky Mountain Conference
Rocky Mountain Conference on Magnetic Resonance
Abstracts and meeting program from the 23rd annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 2-6, 1981.
Autooscillations In Zinc, Manfred Wuttig, Alex Aning, Tetsuro Suzuki
Autooscillations In Zinc, Manfred Wuttig, Alex Aning, Tetsuro Suzuki
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
22nd Rocky Mountain Conference On Analytical Chemistry
22nd Rocky Mountain Conference On Analytical Chemistry
Rocky Mountain Conference on Magnetic Resonance
Abstracts and meeting program from the 22nd annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 10-14, 1980.
The Use Of Thermal Analysis In The Identification And Characterization Of Fibers Of Forensic Interest, Ronald J. Coffey
The Use Of Thermal Analysis In The Identification And Characterization Of Fibers Of Forensic Interest, Ronald J. Coffey
All-Inclusive List of Electronic Theses and Dissertations
This study investigates the use of thermal analysis for the identification and characterization of fibers for forensic purposes. Fibers such as polyesters, polyacrylics, polypropylenes and nylon were investigated by Differential Thermal Analysis (D.T.A.) and Thermogravimetric Analysis (T.G.A.) to see if their resulting thermograms were characteristic of each fiber. Also, infrared analysis was performed on each fiber. In addition, such factors as heating rate and sample size along with fiber blends were studied as to their effect on thermograms. As a result of this study several important conclusions may be drawn. Although it was found that for the most part D.T.A. …
Autooscillations And Nonlinear Anelasticity, Manfred Wuttig, Tetsuro Suzuki
Autooscillations And Nonlinear Anelasticity, Manfred Wuttig, Tetsuro Suzuki
Materials Science and Engineering Faculty Research & Creative Works
In conclusion it can be stated that a novel phenomenon, a mechanical auto oscillation, has been described theoretically and shown to exist experimentally. These auto oscillations occur when a nonlinear anelastic solid is forced into large amplitude oscillations in the vicinity of a martensitic transformation. They manifest themselves as a low frequency auto modulation of the a martensitic transformation. They manifest themselves as low frequency auto modulation of the forced vibration of such a solid. © 1980.
21st Rocky Mountain Conference On Analytical Chemistry
21st Rocky Mountain Conference On Analytical Chemistry
Rocky Mountain Conference on Magnetic Resonance
Abstracts and meeting program from the 21st annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, July 30 - August 1, 1979.
Nonlinear Anelasticity And The Martensitic Transformation, Manfred Wuttig, Tetsuro Suzuki
Nonlinear Anelasticity And The Martensitic Transformation, Manfred Wuttig, Tetsuro Suzuki
Materials Science and Engineering Faculty Research & Creative Works
Zener's model of a standard linear solid is extended to include nonlinearities characteristic of metals and alloys in the vicinity of a martensitic transformation. The equation of motion of a nonlinear anelastic solid is derived and solved using van der Pol's method. The characteristics of the solutions indicate that auto-oscillations of finite amplitude can be excited externally. It is proposed that the streaming oscillations represent the beat between the external excitation and the auto-oscillation. © 1979.
20th Annual Rocky Mountain Conference On Analytical Chemistry
20th Annual Rocky Mountain Conference On Analytical Chemistry
Rocky Mountain Conference on Magnetic Resonance
Abstracts and program from the 20th annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 7-9, 1978.
Concrete Ships, Mark L. Lavache
Concrete Ships, Mark L. Lavache
Marine Affairs Theses and Major Papers
The incentive behind this study is based on a two-fold premise: 1) that a comprehensive outline of the historical development of concrete shipbuilding and its related technologies is either non-existent or defies discovery, and 2) that although this study is neither based on a hypothesis, nor intended to resolve a problem area or promote a position, its merit lies in its inductive nature. Included are explanations of of the various compositions, uses, and construction techniques relating to reinforced concrete, ferro-cement, and prestressed concrete.
19th Annual Conference On Analytical Chemistry
19th Annual Conference On Analytical Chemistry
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 19th annual meeting of the Conference on Analytical Chemistry, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 1-3, 1977.
18th Annual Rocky Mountain Spectroscopy Conference
18th Annual Rocky Mountain Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Final program and abstracts from the 18th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 2-3, 1976.