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Articles 31 - 60 of 132
Full-Text Articles in Engineering
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A simple process for card assembly by Direct Chip Attachment (DCA) uses electrically conductive adhesives. Two methods create the same intermediate wafer product with a layer of insulative thermoplastic and conductive thermoplastic bumps. After sawing or dicing the wafer to form the chips, the chips are adhered to chip carriers with conductive pads which match the conductive thermoplastic bumps, using heat and pressure. Chips may be easily removed and replaced using heat.
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A simple process for card assembly by Direct Chip Attachment (DCA) uses electrically conductive adhesives. Two methods create the same intermediate wafer product with a layer of insulative thermoplastic and conductive thermoplastic bumps. After sawing or dicing the wafer to form the chips, the chips are adhered to chip carriers with conductive pads which match the conductive thermoplastic bumps, using heat and pressure. Chips may be easily removed and replaced using heat.
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Direct Chip Attachment (Dca) With Electrically Conductive Adhesives, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A simple process for card assembly by Direct Chip Attachment (DCA) uses electrically conductive adhesives. Two methods create the same intermediate wafer product with a layer of insulative thermoplastic and conductive thermoplastic bumps. After sawing or dicing the wafer to form the chips, the chips are adhered to chip carriers with conductive pads which match the conductive thermoplastic bumps, using heat and pressure. Chips may be easily removed and replaced using heat.
Acuta Enews May 1998, Vol.27, No. 5
Acuta Enews May 1998, Vol.27, No. 5
ACUTA Newsletters
In This Issue
Board Approves Slate of Nominees
Moderators &Monitors Needed in San Diego!
Board Report
Let there be (Blue) Light!
Contractors on Your Campus?
DC at a Glance
Book Your Room for San Diego NOW!
Positions Available
Welcome New Member
Analysis Of Combustion-Driven Acoustics, L Boshoff-Mostert, Hendrik J. Viljoen
Analysis Of Combustion-Driven Acoustics, L Boshoff-Mostert, Hendrik J. Viljoen
Papers in Reaction Kinetics
Abstract-Combustion-driven acoustic oscillations are investigated by performing a onedimensional stability analysis of a burner-stabilized premixed flame. In contrast to other investigators, no initial acoustic wave is assumed in the analysis; the downstream acoustic field results from flame instability. Two models are considered: the thermodiffusive model (uncoupled model) and the fully coupled thermodiffusive-hydrodynamic model. The fully coupled problem exhibits instability at a much lower critical Lewis number than the uncoupled problem.
Implementation Of A Database System With Boolean Algebra Constraints, András Salamon
Implementation Of A Database System With Boolean Algebra Constraints, András Salamon
Department of Computer Science and Engineering: Dissertations, Theses, and Student Research
This thesis describes an implementation of a constraint database system with constraints over a Boolean Algebra of sets. The system allows within the input database as well as the queries equality, subset-equality and monotone inequality constraints between Boolean Algebra terms built up using the operators of union, intersection and complement. Hence the new system extends the earlier DISCO system, which only allowed equality and subset-equality constraints between Boolean algebra variables and constants. The new system allows Datalog with Boolean Algebra constraints as the query lan- guage. The implementation includes an extension of Naive and Semi-Naive evaluation methods for Datalog programs …
Nebraska Tractor Test Museum Committee Minutes April 14, 1998, Tractor Museum
Nebraska Tractor Test Museum Committee Minutes April 14, 1998, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
Treasurer's Report Preparation for Dedication Fund Raising Issues
Acuta Enews April 1998, Vol.27, No. 4
Acuta Enews April 1998, Vol.27, No. 4
ACUTA Newsletters
In This Issue
Achievement Award Nominations
Cornell to Host Local Event June 8 and 9
Board Report
Using Digital Imagery to Enhance Design Efforts
From ACUTA Headquarters
DC at a Glance
Local Event
Positions Availalbe
Welcome New Members
Ellipsometric Determination Of Optical Constants For Silicon And Thermally Grown Silicon Dioxide Via A Multi-Sample, Multi-Wavelength, Multi-Angle Investigation, C. M. Herzinger, B. Johs, W. A. Mcgahan, John A. Woollam, W. Paulson
Ellipsometric Determination Of Optical Constants For Silicon And Thermally Grown Silicon Dioxide Via A Multi-Sample, Multi-Wavelength, Multi-Angle Investigation, C. M. Herzinger, B. Johs, W. A. Mcgahan, John A. Woollam, W. Paulson
Department of Electrical and Computer Engineering: Faculty Publications
Optical constant spectra for silicon and thermally grown silicon dioxide have been simultaneously determined using variable angle of incidence spectroscopic ellipsometry from 0.75 to 6.5 eV. Spectroscopic ellipsometric data sets acquired at multiple angles of incidence from seven samples with oxide thicknesses from 2 to 350 nm were analyzed using a self-contained multi-sample technique to obtain Kramers–Kronig consistent optical constant spectra. The investigation used a systematic approach utilizing optical models of increasing complexity in order to investigate the need for fitting the thermal SiO2 optical constants and including an interface layer between the silicon and SiO2 in modeling …
Nebraska Tractor Test Useumcommittee Minutes March 10, 1998, Tractor Museum
Nebraska Tractor Test Useumcommittee Minutes March 10, 1998, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
Hitchcock Foundation Big Red Collectors Dedication of Museum
Acuta Enews March 1998, Vol.27, No. 3
Acuta Enews March 1998, Vol.27, No. 3
ACUTA Newsletters
In This Issue
Nominate Now for Board of Directors
Change Reflects Our Growth
Student Paper Competition Deadline
Board Report
"Click Here to Enter a Sweepstakes"
ACUTA Local Event
Spotlight
Maureen Trimm Is New Director-at-Large
Are You Listening?
DC at a Glance
Positions Available
Welcome New Members
Studies Of Metallic Multilayer Structures, Optical Properties, And Oxidation Using In Situ Spectroscopic Ellipsometry, Xiang Gao, Jeff Hale, Scott Heckens, John A. Woollam
Studies Of Metallic Multilayer Structures, Optical Properties, And Oxidation Using In Situ Spectroscopic Ellipsometry, Xiang Gao, Jeff Hale, Scott Heckens, John A. Woollam
Department of Electrical and Computer Engineering: Faculty Publications
In situ spectroscopic ellipsometry (SE) has been successfully used to accurately measure sputter deposition rates and optical constants of un-oxidized metal layers and to control the growth of magnetic multilayers. The structures include [Co/Cu] n , [Co/Au] n , [Co/Ni] n , [Co/Pd] n and [Co/Pd/ Au] n . Layer thickness precision is better than ±0.05 nm for layer thicknesses in the range of 0.2 nm to 10 nm. Closed-loop feedback control of layer thickness is also demonstrated. Good consistency was obtained by comparing the in situ SE results to x-ray diffraction measurements. Dynamic oxidation studies of [Co/Au] n and …
Two-Dimensional Ferroelectric Films, Alexander V. Bune, Vladimir M. Fridkin, Stephen Ducharme, Lev M. Blinov, Serguei P. Palto, Alexander V. Sorokin, S. G. Yudin, A. Zlatkin
Two-Dimensional Ferroelectric Films, Alexander V. Bune, Vladimir M. Fridkin, Stephen Ducharme, Lev M. Blinov, Serguei P. Palto, Alexander V. Sorokin, S. G. Yudin, A. Zlatkin
Stephen Ducharme Publications
Ultrathin crystalline films offer the possibility of exploring phase transitions in the crossover region between two and three dimensions. Second- order ferromagnetic phase transitions have been observed in monolayer magnetic films [1,2], where surface anisotropy energy stabilizes the two-dimensional ferromagnetic state at finite temperature [3]. Similarly, a number of magnetic materials have magnetic surface layers that show a second-order ferromagnetic–paramagnetic phase transition with an increased Curie temperature [4]. Ferroelectricity is in many ways analogous to ferromagnetism, and bulk-like ferroelectricity and finite-size modifications of it have been seen in nanocrystals as small as 250 Å in diameter [5], in perovskite films …
Design, Performance, And Applications Of A Coherent Ultra-Wideband Random Noise Radar, Ram M. Narayanan, Yi Xu, Paul D. Hoffmeyer, John O. Curtis
Design, Performance, And Applications Of A Coherent Ultra-Wideband Random Noise Radar, Ram M. Narayanan, Yi Xu, Paul D. Hoffmeyer, John O. Curtis
Department of Electrical and Computer Engineering: Faculty Publications
A novel coherent ultra-wideband radar system operating in the 1- to 2-GHz frequency range has been developed recently at the University of Nebraska. The radar system transmits white Gaussian noise. Detection and localization of buried objects is accomplished by correlating the reflected waveform with a time-delayed replica of the transmitted waveform. Broadband dual-polarized log-periodic antennas are used for transmission and reception. A unique signal-processing scheme is used to inject coherence into the system by frequency translation of the ultrawideband signal by a coherent 160-MHz phase-locked source prior to performing heterodyne correlation. The system coherence allows the extraction of a target’s …
Tractor Test Museum Committee February 10, 1998, Tractor Museum
Tractor Test Museum Committee February 10, 1998, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
Heating Issues Handouts for visitors Big Red Club
Acuta Enews February 1998, Vol.27, No. 2
Acuta Enews February 1998, Vol.27, No. 2
ACUTA Newsletters
In This Issue
Call for Nominations
ACUTA Board of Directors 1998-1999
Board Report
ACUTA 1998 EVENTS
International Project Aims to Determine What IT Services Really Cost
DC at a Glance
Positions Available
Welcome New Members
A Study Of Piezoelectric Orthorhombic Ta2O5, B. R. Jooste, Hendrik J. Viljoen
A Study Of Piezoelectric Orthorhombic Ta2O5, B. R. Jooste, Hendrik J. Viljoen
Hendrik J. Viljoen Publications
In 1985 it was first reported that monoclinic Ta2O5 has piezoelectric properties comparable to ZnO. In this work we report on the deposition, characterization, and qualitative assessment of the piezoelectric behavior of orthorhombic Ta2O5. Reactive magnetron sputtering was used to deposit thin films of Ta2O5 onto substrates of 316L stainless steel. Without substrate heating the crystallinity was poor. A rapid thermal anneal improved the crystallinity. The orthorhombic phase was dominantly present on all substrates. The piezoelectric property was qualitatively assessed, including a high temperature test at 650 °C.
Nebraska Tractor Test Museum Committee Minutes January 20th, 1998, Tractor Museum
Nebraska Tractor Test Museum Committee Minutes January 20th, 1998, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
Roof Repair Big Red Convention Dedication Ceremony
Electromagneticbeamdirecting Means-Sampleanalyss System Stage, And Method Of Use, Daniel W. Thompson, Darin W. Glenn, John A. Woollam
Electromagneticbeamdirecting Means-Sampleanalyss System Stage, And Method Of Use, Daniel W. Thompson, Darin W. Glenn, John A. Woollam
Department of Electrical and Computer Engineering: Faculty Publications
Disclosed is an electromagnetic beam directing means for use with sample analysis systems, such as reflectometers, ellipsometers and polarimeters and the like, use of which facilitates investigation of sample systems which are not mounted to a sample analysis system sample system supporting stage. The present invention eliminates the requirement of extensive sample analysis system component realignment when alternatingly performing analysis of sample systems mounted upon, and mounted other than upon, a sample analysis system sample system supporting stage.
Biodiesel Fuel From Animal Fat. Ancillary Studies On Transesterification Of Beef Tallow, Fangrui Ma, L. Davis Clements, Milford Hanna
Biodiesel Fuel From Animal Fat. Ancillary Studies On Transesterification Of Beef Tallow, Fangrui Ma, L. Davis Clements, Milford Hanna
Nebraska Center for Biotechnology: Faculty and Staff Publications
Transesterification of beef tallow was investigated. The solubility of ethanol in beef tallow was much higher than that of methanol. At 100 °C the solubility of methanol was 19% (w/w). The solubility of ethanol in beef tallow reached 100% (w/w) at about 68 °C. For the distribution of methanol between beef tallow methyl esters (BTME) and glycerol, the percentage of total methanol in the glycerol phase was higher than that in the fatty acid methyl ester (FAME) phase in a simulated system at room temperature. At 65-80 °C, however, the percentage of total methanol in FAME (60% (w/w)) was higher …
Bacterial Reduction Of Crystalline Fe3+ Oxides In Single Phase Suspensions And Subsurface Materials, John M. Zachara, James K. Fredrickson, Shu-Mei Li, David W. Kennedy, Steven C. Smith, Paul L. Gassman
Bacterial Reduction Of Crystalline Fe3+ Oxides In Single Phase Suspensions And Subsurface Materials, John M. Zachara, James K. Fredrickson, Shu-Mei Li, David W. Kennedy, Steven C. Smith, Paul L. Gassman
US Department of Energy Publications
Microbiologic reduction of synthetic and geologic Fe3+ oxides associated with four Pleistocene- age, Atlantic coastal plain sediments was investigated using a dissimilatory Fe reducing bacterium (Shewanella putrefaciens, strain CN32) in bicarbonate buffer. Experiments investigated whether phosphate and anthraquinone-2, 6-disulfonate, (AQDS, a humic acid analogue) influenced the extent of crystalline Fe3+ oxide bioreduction and whether crystalline Fe3+ oxides in geologic materials are more or less reducible than comparable synthetic phases. Anaerobic incubations (108 organisms/mL) were performed both with and without PO4 and AQDS that functions as an electron repository and shuttle. The production of …
Fm 34-54, Technical Intelligence, 30 January 1998, Robert Bolin , Depositor
Fm 34-54, Technical Intelligence, 30 January 1998, Robert Bolin , Depositor
Department of Defense Military Intelligence
This manual defines and describes the technical intelligence mission. It names the key technical intelligence organizations involved at the national level and their interrelationships and responsibilities.
The manual describes in detail the technical intelligence organizations and operations in a US command in the field. It discusses at length the responsibilities on the key staff sections in the command.
It has extensive appendices explaining forms and procedures used by forces in the field. It has an excellent list of acronyms and glossary.
Comment by the depositor
A clear understanding of the evolution of technical intelligence may not be needed by the …
Apparatus And Method For Detection And Concentration Measurement Of Trace Metals Using Laser Induced Breakdown Spectroscopy, Dennis R. Alexander
Apparatus And Method For Detection And Concentration Measurement Of Trace Metals Using Laser Induced Breakdown Spectroscopy, Dennis R. Alexander
Department of Electrical and Computer Engineering: Faculty Publications
A method and apparatus for in situ detection and concentration measurement of trace elements in an analysis Sample is disclosed. The invention uses laser induced breakdown spectroscopy (LIBS) wherein femtosecond pulsed laser energy is employed to produce the plasma. The femtosecond pulsed laser energy is focused on the analysis Sample to produce the plasma and the resulting emission is delivered for spectral analysis. Because the method and apparatus of the present invention allow breakdown of the analysis Sample without propagation of energy to the Sample-air interface, a plasma is produced that consists essentially of Sample materials without being contaminated by …
Infrared Ellpsometer/ Polarmeter System, Method Of Calibration, And Use Thereof, Daniel W. Thompson, Blaine D. Johs
Infrared Ellpsometer/ Polarmeter System, Method Of Calibration, And Use Thereof, Daniel W. Thompson, Blaine D. Johs
Department of Electrical and Computer Engineering: Faculty Publications
A sample system investigation system, such as an ellipsometer or polarimeter system, for use in investigating sample systems with electromagnetic wavelengths in the infrared range, and a calibration method for compensating nonidealities in multi-dimensional system rotated and non-rotated component representing matricies, are disclosed. An essentially achromatic compensator of dual-rhomb construction, which introduces a (3*LAMBDA/4) phase shift, but essentially no deviation in the direction of propagation of a polarized beam of electromagnetic wavelengths caused to pass there through, even when said compensator is caused to continuously rotate, is also disclosed.
A New Radiosonde System For Profiling The Lower Troposphere, Brian R Corner, Robert D. Palmer
A New Radiosonde System For Profiling The Lower Troposphere, Brian R Corner, Robert D. Palmer
Department of Electrical and Computer Engineering: Faculty Publications
A new, inexpensive radiosonde transmitter and receiver system has been developed for measuring wind field inhomogeneities in the planetary boundary layer using multiple simultaneously launched balloons. The radio- sondes use a narrowband-frequency-modulated carrier signal to transmit atmospheric pressure and temperature information to a surface receiver. The pressure and temperature data transmitted by the radiosondes allow their height above the surface to be ascertained. In addition, the radiosondes can be tracked with a photographic camera system to provide the azimuth and elevation angles of the radiosondes during their ascent, so that their three-dimensional horizontal position can be determined. By tracking the …
Electromagnetic Beam Directing Means-Sample Analysis System Stage, And Method Of Use, Daniel W. Thomspon, Darin W. Glenn, John A. Woollam
Electromagnetic Beam Directing Means-Sample Analysis System Stage, And Method Of Use, Daniel W. Thomspon, Darin W. Glenn, John A. Woollam
Department of Electrical and Computer Engineering: Faculty Publications
Disclosed is an electromagnetic beam directing means for use with sample analysis systems, such as relfectometers, ellipsometers and polarimeters and the like, use of which facilitates investigation of sample systems which are not mounted to a sample analysis system sample system supporting stage. The present invention eliminates the requirement os extensice sample analysis system component realignment when alternatingly performing analysis of sample systems mounted upon, and mounted other than upon, a sample analysis system sample system supporting stage.
Optical Determination Of Shallow Carrier Profiles Using Fourier Transform Infrared Ellipsometry, Thomas E. Tiwald, John A. Woollam, John A. Woollam
Optical Determination Of Shallow Carrier Profiles Using Fourier Transform Infrared Ellipsometry, Thomas E. Tiwald, John A. Woollam, John A. Woollam
Department of Electrical and Computer Engineering: Faculty Publications
Dopant profiles were determined by ex situ Fourier transform infrared variable-angle spectroscopic ellipsometry. The technique exploits carrier absorption in the mid-infrared spectral range and combines the sensitivity of ellipsometry with a simple Drude free carrier absorption model to determine the carrier profile. The noncontact, nondestructive nature of the measurement suggests both ex situ and in situ monitoring and control applications. In this study, the carrier profiles were modeled as graded multilayers that can be constrained to a given functional form (Gaussian, erfc, etc.) when desired. Boron and arsenic implanted silicon wafers that were rapid thermal anneal and furnace annealed were …
The Effects Of Catalyst, Free Fatty Acids, And Water On Transecterification Of Beef Tallow, Fangrui Ma, L. D. Clements, Milford Hanna
The Effects Of Catalyst, Free Fatty Acids, And Water On Transecterification Of Beef Tallow, Fangrui Ma, L. D. Clements, Milford Hanna
Industrial Agricultural Products Center: Publications and Information
Transesterification of beef tallow and methanol is affected by many factors. Catalyst, free fatty acids, and water in beef tallow, and reaction time were investigated. Sodium hydroxide (NUOH) was a more effective catalyst than sodium methoxide (NaMeOj. NaOH and NaMeO reached their maximum activities at 0.3% and 0.5%, w/w of beef tallow, respectively. The presence of water had more negative effect on transesterification than did the presence of free fatty acids (FFA). For best results, the water content of beef tallow should be kept not beyond 0.0696, w/w. FFA content of beef tallow should be kept below 0.596, w/w. The …
Induction Of Oxidative Stress In Brain Tissues Of Mice After Subchronic Exposure To 2,3,7,8-Tetrachlorodibenzo-P-Dioxin, Ezdihar A. Hassoun, Shawn C. Wilt, Michael J. Devito, Angelique Van Birgelen, Naser Z. Alsharif, Linda S. Bimbaum, Sidney J. Stoh
Induction Of Oxidative Stress In Brain Tissues Of Mice After Subchronic Exposure To 2,3,7,8-Tetrachlorodibenzo-P-Dioxin, Ezdihar A. Hassoun, Shawn C. Wilt, Michael J. Devito, Angelique Van Birgelen, Naser Z. Alsharif, Linda S. Bimbaum, Sidney J. Stoh
United States Environmental Protection Agency: Staff Publications
The ability of single doses of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) to induce oxidative stress in hepatic and some extrahepatic tissues of animals is well documented. However, no previous study has examined the ability of TCDD to induce oxidative stress and tissue damage in brain in vivo. In this study the ability of TCDD to induce oxidative stress in brain tissues of mice was studied after subchronic exposures. Groups of female B6C3F1 mice were treated orally with TCDD (0, 0.45, 1.5, 15, and 150 ng/kg/day) for 13 weeks, 5 days/week. The animals were euthanized 3 days after the last treatment and brain tissues …
A Multithreaded Scheduler For A High-Speed Simulator, Gene Saghi, Kirk Reinholtz, Paul Savory
A Multithreaded Scheduler For A High-Speed Simulator, Gene Saghi, Kirk Reinholtz, Paul Savory
Department of Industrial and Management Systems Engineering: Faculty Publications
The Cassini spacecraft is on its journey to Saturn to perform a close-up study of the Saturnian system; its rings, moons, magneto-sphere, and the planet itself. Sequences of commands will be sent to the spacecraft by ground personnel to control every aspect of the mission. To validate and verify these command sequences, a bit-level, high-speed simulator (HSS) has been developed. To maximize performance, the HSS is implemented with multiple threads and runs on a multiprocessor system. A key component of the HSS is the scheduler, which controls the execution of the simulator. The general framework of the scheduler can be …