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Articles 1 - 30 of 127
Full-Text Articles in Engineering
Boron Carbide/N-Silicon Carbide Heterojunction Diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, Brian W. Robertson
Boron Carbide/N-Silicon Carbide Heterojunction Diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, Brian W. Robertson
Nebraska Center for Materials and Nanoscience: Faculty Publications
The fabrication, initial structural characterization, and diode measurements are reported for a boron carbide/silicon carbide heterojunction diode. Current–voltage curves are obtained for operation at temperatures from 24 to 351 °C. Plasma-enhanced chemical-vapor deposition (PECVD) -deposited undoped boron carbide material is highly crystalline and consists of a variety of polytypes of boron carbide (BC) with crystal sizes as large as 110 nm. Crystal phases are similar to those for PECVD BC on Si but only partially match known boron and boron-rich BC phases.
Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, Daniel W. Thompson, John A. Woollam, P. F. Williams, Supriyo Bandyopadhyay
Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, Daniel W. Thompson, John A. Woollam, P. F. Williams, Supriyo Bandyopadhyay
Department of Electrical and Computer Engineering: Faculty Publications
We report the observation of giant photoresistivity in electrochemically self-assembled CdS and ZnSe nanowires electrodeposited in a porous alumina film. The resistance of these nanowires increases by one to two orders of magnitude when exposed to infrared radiation, possibly because of real-space transfer of electrons from the nanowires into the surrounding alumina by photon absorption. This phenomenon has potential applications in ‘‘normally on’’ infrared photodetectors and optically controlled switches.
Hybrid Transient-Parametric Method And System To Distinguish And Analyze Sources Of Acoustic Emission For Nondestructive Inspection And Structural, Health Monitoring, Yuris Dzenis
Department of Mechanical and Materials Engineering: Faculty Publications
A nondestructive evaluation (NDE) technique for inspecting or health monitoring of Structures and/or Specimens by analyzing acoustic emission (AE) signals emitted by the Structures and/or specimens. The method and System ana lyzes acoustic emission (AE) signals emitted by structures and/or Specimens. AE Signals emitted by the Structures and/or Specimens are parametrically filtered as a function of parametric filters corresponding to characteristic waveforms of transient AE classes of predefined AE signals. In para metric analysis, the filtering may be pre- or post-recording. In transient AE analysis, the filtering may be prior to transient recording of the transient signals.
Acuta Enews December 2001, Vol.30, No. 12
Acuta Enews December 2001, Vol.30, No. 12
ACUTA Newsletters
In This Issue
Michigan Tech Chooses Network Appliances
ACUTA Events
The "New Member Roundup"- Why It's Important
DC Update
ACUTA EVENTS
Mexico Dialing Pattern Change
Did the Lights Go Out? Events, Results, and Impacts
Board Report
Thanks to Our Sponsors!
Fourth Quarter 2001 Web Sites to See
Welcome New Members
Positions Available
Will Voluntary And Educational Programs Meet Environmental Objectives? Evidence From A Survey Of New York Dairy Farms, Gregory L. Poe, Nelson L. Bills, B. C. Bellows, Patricia Crosscombe, Richard K. Koelsch, Michael J. Kreher, Peter Wright
Will Voluntary And Educational Programs Meet Environmental Objectives? Evidence From A Survey Of New York Dairy Farms, Gregory L. Poe, Nelson L. Bills, B. C. Bellows, Patricia Crosscombe, Richard K. Koelsch, Michael J. Kreher, Peter Wright
Biological Systems Engineering: Papers and Publications
This paper presents the results from a survey of New York dairy farms that links manure management practices and farmer willingness to participate in voluntary environmental programs, focusing on those operations that are not automatically designated as Concentrated Animal Feeding Operations. A wide divergence is found between actual and recommended manure management practices on individual dairy farms (high), the apparent ability of farms to divert financial resources to environmental practices (mixed), and the willingness to participate in voluntary programs at various annual costs per cow (low). These findings have policy implications for the USDA/USEPA National Strategy for Animal Feeding Operations.
Non-Repressing Carbon Sources For Alcohol Oxidase (Aoxi) Promoter Of Pichia Pastoris, Mehmet Inan, Michael M. Meagher
Non-Repressing Carbon Sources For Alcohol Oxidase (Aoxi) Promoter Of Pichia Pastoris, Mehmet Inan, Michael M. Meagher
Papers in Biochemical Engineering
The growth of Pichiapastoris in a mixture of either glycerol or glucose and methanol follows a diauxic growth, with C1, utilizing enzymes being repressed. Therefore, these carbon sources can not be used as a mixture with methanol to simultaneously grow P. pastoris and induce C1, utilizing enzymes, especially in shake flask cultures of AOX-deficient P. pastoris. Among the alternative carbon sources tested, alanine, sorbitol, mannitol and trehalose, did not repress β-gal production when methanol was used as an inducer in mut- strain of P. pastoris. Our results show that either one of alanine, sorbitol, mannitol or trehalose can be used …
Mechanical, Geometrical, And Electrical Characterization Of Silicon Membranes For Open Stencil Masks, E. Sossna, A. Degen, I. W. Rangelow, M. Drzik, P. Hudek, T. E. Tiwald, John A. Woollam
Mechanical, Geometrical, And Electrical Characterization Of Silicon Membranes For Open Stencil Masks, E. Sossna, A. Degen, I. W. Rangelow, M. Drzik, P. Hudek, T. E. Tiwald, John A. Woollam
Department of Electrical and Computer Engineering: Faculty Publications
Silicon membranes are used for stencil masks which are key to charged particle projection lithography, particularly for ion projection lithography, electron beam projection. Quantitative and qualitative determination of the mechanical properties of the true thickness, thickness variations (morphology), electrical conductivity and stress is critical to the development of next generation lithography. The metrology setup includes high accuracy thickness, refractive index and electrical conductivity measurement based on infrared variable angle spectroscopic ellipsometry, thickness variation characterization based on the Fizeau interferometric scheme and mechanical stress evaluation based on a novel double bulging technique.
Acuta Enews November 2001, Vol.30, No. 11
Acuta Enews November 2001, Vol.30, No. 11
ACUTA Newsletters
In This Issue
Tornado Strikes Maryland Campus
Thanks to Exhibitors for 2001
ACUTA Events
DC Update
IT Disasters Recovery Near the World Trade Center
Board Report
Business Continuity Planning in Higher Ed
Welcome New Members
Positions Available
Crash Attenuation System, John D. Reid, John R. Rohde, Dean L. Sicking
Crash Attenuation System, John D. Reid, John R. Rohde, Dean L. Sicking
Department of Mechanical and Materials Engineering: Faculty Publications
A crash attenuation system having an impact head, and energy absorption mechanism. The energy absorbing mechanism has a mandrel for rupturing thin-walled tubes in a controlled rupture to absorb impact forces from a colliding vehicle. A frame may be used to mount the system to a truck, trailer, guardrail, median barrier end treatment, or a crash cushion. Stress concentrators may be incorporated into the tubes and the mandrels to selectively control rupturing and energy dissipation.
Statistical Evaluation Of Image Quality Measures, Ismail Avcibas, Bulent Sankur, Khalid Sayood
Statistical Evaluation Of Image Quality Measures, Ismail Avcibas, Bulent Sankur, Khalid Sayood
Department of Electrical and Computer Engineering: Faculty Publications
In this work we comprehensively categorize image quality measures, extend measures defined for gray scale images to their multispectral case, and propose novel image quality measures. They are categorized into pixel difference-based, correlation-based, edge-based, spectral-based, context-based and human visual system (HVS)-based measures. Furthermore we compare these measures statistically for still image compression applications. The statistical behavior of the measures and their sensitivity to coding artifacts are investigated via analysis of variance techniques. Their similarities or differences are illustrated by plotting their Kohonen maps. Measures that give consistent scores across an image class and that are sensitive to coding artifacts are …
Oct 2001, Tractor Museum
Oct 2001, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
Software Program Storage Space Needed 16 new members
Fabrication Of 2- And 3-Dimensional Nanostructures, Hong Jiang, Camelia N. Borca, Bo Xu, Brian W. Robertson
Fabrication Of 2- And 3-Dimensional Nanostructures, Hong Jiang, Camelia N. Borca, Bo Xu, Brian W. Robertson
Department of Mechanical and Materials Engineering: Faculty Publications
Amongst tools for fabricating periodic and aperiodic nanostructures and nanodevices, electron beam-induced organometallic chemical vapor deposition (E-OMCVD) offers a highly flexible and controllable one-step deposition process. E-OMCVD enables maskless fabrication of nanoscale research and custom structures that have least dimensions near or below 10 nm–a scale at which other methods prove difficult or costly. Using the focused electron beam in a modified HB501 field-emission scanning transmission electron microscope (STEM), pads and wires with uniform thickness and well-defined shapes have been defined and deposited. Although conditions for fabricating the smallest deposits have not yet been optimized, the edge acuity (sharpness) of …
Acuta Enews October 2001, Vol.30, No. 10
Acuta Enews October 2001, Vol.30, No. 10
ACUTA Newsletters
In This Issue
How Telecom Answered the Call
ACUTA EVENTS
New Member Roundup
DC Update
Board Report
Welcome New Members
Positions Available
Characteristics And Sequence Of Phosphoglycolate Phosphatase From A Eukaryotic Green Alga Chlamydomonas Reinhardtii, Tarlan G. Mamedov, Kensaku Suzuki, Kenji Miura, Ken-Ichi Kucho, Hideya Fukuzawa
Characteristics And Sequence Of Phosphoglycolate Phosphatase From A Eukaryotic Green Alga Chlamydomonas Reinhardtii, Tarlan G. Mamedov, Kensaku Suzuki, Kenji Miura, Ken-Ichi Kucho, Hideya Fukuzawa
Papers in Biochemical Engineering
Phosphoglycolate phosphatase (PGPase), a key en¬zyme of photorespiration in photosynthetic organisms, was purified from Chlamydomonas reinhardtii. The en¬zyme was an ~65-kDa homodimer with a pI value of 5.1 composed of ~32-kDa subunits not connected by any S–S bridges. It was also highly specific for phosphoglycolate with a Km value of 140 μM and an optimal pH between 8 and 9. The activity was strongly inhibited by CaCl2, and it recovered competitively following the addition of MgCl2 or EGTA. A mobility shift was observed in SDS-polyacrylamide gel electrophoresis by the addition of CaCl2, indicating that the enzyme binds to Ca2+ . …
Acuta Enews September 2001, Vol.30, No. 9
Acuta Enews September 2001, Vol.30, No. 9
ACUTA Newsletters
In This Issue
Conference Highlights
ACUTA EVENTS
DC Updates
Board Report
ACUTA Plans Audio Seminar on Taxes, Surcharges, and Fees
Welcome New Members
Positions Available
Nutrients In Runoff Following The Application Of Swine Manure To Interrill Areas, John E. Gilley, Bahman Eghball, B. J. Weinhold, Phillip S. Miller
Nutrients In Runoff Following The Application Of Swine Manure To Interrill Areas, John E. Gilley, Bahman Eghball, B. J. Weinhold, Phillip S. Miller
Biological Systems Engineering: Papers and Publications
The P content of swine manure can be reduced through the addition of feed supplements or the use of selected corn hybrids. This study was conducted to compare interrill runoff losses of P and N from three soils following the application of swine manure obtained from selected diets. The soils used in this investigation included a Hersh sandy loam, Pierre silty clay, and Sharpsburg silt loam. Simulated rainfall was applied during both initial and wet runs to a soil pan on which swine manure produced from low phytate corn (LPC), phytase added to the diet (PHY), or a traditional corn …
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Electrode Modification Using An Unzippable Polymer Paste, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A paste is described for capping electrodes with an oxide free metal layer incorporating a solvent, an unzippable polymer and particles. The electrode could be an interconnect such as a C4 bump. A method for forming a coating and for testing integrated circuit chips is also described. The invention overcomes the problem of interconnecting Pb containing electrodes that are covered with an insulating oxide on integrated circuit chips by coating the Pb containing electrode with Au to provide an oxide free surface for testing and interconnection.
Anisotropy Of Conducting P States And 11B Nuclear Spin-Lattice Relaxation In Mg1-XAlXB2, Kirill D. Belashchenko, Vladimir B. Antropov, S.N. Rashkeev
Anisotropy Of Conducting P States And 11B Nuclear Spin-Lattice Relaxation In Mg1-XAlXB2, Kirill D. Belashchenko, Vladimir B. Antropov, S.N. Rashkeev
Nebraska Center for Materials and Nanoscience: Faculty Publications
We calculated the nuclear spin-lattice relaxation rate in the Mg1-xAlxB2 system and found that the orbital relaxation mechanism dominates over the dipolar and Fermi-contact mechanisms in MgB2, whereas in AlB2 due to a smaller density of states and strong anisotropy of boron p orbitals the relaxation is completely determined by Fermi-contact interaction. The results for MgB2 are compared with existing experimental data. To validate the theory, nuclear resonance experiments for the studied diboride alloy system are needed.
Radio Frequency (Rf) Transponder (Tag) With Composite Antenna, Ravi F. Saraf
Radio Frequency (Rf) Transponder (Tag) With Composite Antenna, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
An antenna composed of composite material which can be screen printed is proposed for RFID transponders and other RF communication systems.
Coexistence Of Covalent And Metallic Bonding In The Boron Intercalation Superconductor Mgb2, Kirill D. Belashchenko, Mark Van Schilfgaarde, Vladimir P. Antropov
Coexistence Of Covalent And Metallic Bonding In The Boron Intercalation Superconductor Mgb2, Kirill D. Belashchenko, Mark Van Schilfgaarde, Vladimir P. Antropov
Nebraska Center for Materials and Nanoscience: Faculty Publications
Chemical bonding and electronic structure of MgB2, a boron-based newly discovered superconductor, is studied using self-consistent band-structure techniques. Analysis of the transformation of the band structure for the hypothetical series of graphite–primitive graphite–primitive graphitelike boron–intercalated boron, shows that the band structure of MgB2 is graphitelike, with π bands falling deeper than in ordinary graphite. These bands possess a typically delocalized and metallic, as opposed to covalent, character. The in-plane σ bands retain their two-dimensional (2D) covalent character, but exhibit a metallic hole-type conductivity. The coexistence of 2D covalent in-plane and three-dimensional (3D) metallic-type interlayer conducting bands is …
Acuta Enews August 2001, Vol.30, No. 8
Acuta Enews August 2001, Vol.30, No. 8
ACUTA Newsletters
In This Issue
Safety First at Section Hall
ACUTA Events
DC Update
Overheard on the Listserve: RF Interference on Campus
Welcome New Members
Positions Available
The Effect Of Ethanol And Acetate On Protein Expression In Pichia Pastoris, Mehmet Inan, Michael M. Meagher
The Effect Of Ethanol And Acetate On Protein Expression In Pichia Pastoris, Mehmet Inan, Michael M. Meagher
Papers in Biochemical Engineering
Pichia pastoris is an excellent host for high-level heterologous gene expression, but there is still much interest in improving the productivity of recombinant protein production. l? pastoris produces a small amount of ethanol as a by-product during the glycerol fed-batch phase and the mixed-feed induction phase (glycerol-methanol) of high cell density fermentations, regardless of the phenotype (Mutf, Mut" or Mut-). We have investigated ethanol repression of the AOXl promoter using strains, GS115 (Mutf) and MC100-3 (Mut-), expressing an AOXI-lac2 fusion. The addition of 10 mg t1 ethanol at the start of methanol induction delayed P-galactosidase production and methanol utilization for …
Delamination Resistant Composites Prepared By Small Diameter Fiber Reinforcement At Ply Interfaces, Youris A. Dzenis, Darrell H. Reneker
Delamination Resistant Composites Prepared By Small Diameter Fiber Reinforcement At Ply Interfaces, Youris A. Dzenis, Darrell H. Reneker
Department of Mechanical and Materials Engineering: Faculty Publications
A fiber reinforced composite material comprising a resin matrix and primary reinforcement fibers and further comprising secondary, smaller diameter, reinforcement fibers at one or more ply interfaces, or portion thereof, provides improved interlaminar toughness, strength, and delamination resistance and without substantial increase in weight. In one embodiment, the small fibers are attached to one side of a conventional prepreg prior to lamination. The small fibers are flexible and are expected to conform to the shape and distribution of the primary reinforcing fibers at the interface.
Expression Of A Heterologous Protein C In Mammary Tissue Of Transgenic Animals Using A Long Whey Acidic Protein Promoter , William H. Velander, Henryk Lubton, William N. Drohan, Lothar Hennighausen
Expression Of A Heterologous Protein C In Mammary Tissue Of Transgenic Animals Using A Long Whey Acidic Protein Promoter , William H. Velander, Henryk Lubton, William N. Drohan, Lothar Hennighausen
Papers in Biotechnology
An isolated DNA sequence which regulates the expression of a heterologous gene composed of a mouse whey acidic protein promoter having a length of greater than about 2.4 kb extending upstream from the unique KpnI site in the mouse whey acidic protein gene is disclosed. Specifically a mouse whey acidic protein promoter of about 4.1-4.2 kb in length extending upstream from the unique KpnI site is preferred. This mouse whey acid protein promoter is operably linked to a DNA sequence encoding a heterologous polypeptide and used to prepare transgenic non-human mammals expressing the heterologous polypeptide in their milk. Particularly efficient …
Jul 2001, Tractor Museum
Jul 2001, Tractor Museum
Lester F. Larsen Tractor Museum: Planning and Development Documents
UN Foundation Tractor Raffle Oliver Tractor Repair
Rfid Transponders With Paste Antennas And Flip-Chip Attachment, Ravi F. Saraf
Rfid Transponders With Paste Antennas And Flip-Chip Attachment, Ravi F. Saraf
Department of Chemical and Biomolecular Engineering: Patents
A radio frequency transponder is provided which comprises a substrate layer, a radio frequency integrated circuit affixed to said substrate layer; and an antenna provided on said substrate layer in electrical connection with said radio frequency integrated circuit. The antenna is comprised of a conductive paste material having a resistivity of approximately 20 µΩ-cm, which is greater than the resistivity of a conventional etched copper antenna, but still sufficiently low to provide a radio frequency transponder having acceptable read range. The substrate layer further comprises a flexible organic material. The radio frequency integrated circuit is disposed in a flip-chip configuration …
Transgenic Non-Human Mammals Expressing Human Coagulation Factor Viii And Von Willebrand Factor , William H. Velander
Transgenic Non-Human Mammals Expressing Human Coagulation Factor Viii And Von Willebrand Factor , William H. Velander
Department of Chemical and Biomolecular Engineering: Patents
A non-human transgenic mammalian animal, as described above, contains an exogenous double stranded DNA sequence stably integrated into the genome of the animal, which comprises cis-acting regulatory units operably linked to a DNA sequence encoding human Factor VIII protein and a signal peptide, where the cis-acting regulatory units are active in mammary gland cells and the signal peptide is active in directing newly expressed Factor VIII into the milk of the animal. The promoter may be a milk protein promoter such as for whey acidic protein, casein, lactalbumin, or beta-lactoglobulin promoter. The transgenic mammals are preferably farm animals, for example, …
Energy Absorbing Breakaway Steel Guardrail Post, John R. Rohde, John D. Reid, Dean L. Sicking
Energy Absorbing Breakaway Steel Guardrail Post, John R. Rohde, John D. Reid, Dean L. Sicking
Department of Mechanical and Materials Engineering: Faculty Publications
An improved breakaway steel guardrail post for use in dissipation of impact energy upon impact of the post having an upper post member and a lower post member, a connecting joint, and a mechanism connected to the upper and lower post members for controlling the energy dissipation of the guardrail post about the connecting joint at a predetermined rate. A first embodiment utilizes a cable restraint lopped through openings in he guardrail posts. Other embodiments included straps and fasteners disigned to distort or fail at predetermined rates or strengths and combinations thereof.
Acuta Enews July 2001, Vol.30, No. 7
Acuta Enews July 2001, Vol.30, No. 7
ACUTA Newsletters
In This Issue
Meet the 2001-02 Board
ACUTA Staff Changes
DC Update
Section 508 Sets New Standards
Board Report
FSO and Eye Safety
Welcome New Members
Positions Available
Controlled Buckling Breakaway Cable Terminal, John D. Reid, John R. Rohde, Dean L. Sicking
Controlled Buckling Breakaway Cable Terminal, John D. Reid, John R. Rohde, Dean L. Sicking
Department of Mechanical and Materials Engineering: Faculty Publications
A crash attenuation apparatus for use with a guardrail system having rail posts and rail elements. An impact head has a buffer nose section and a rail post breaking beam system. The post breaking beam system has upper and lower breaking beams attached to the head. A guide tube is attached to the side of the head. A strut member extends from a first attachment point on the rail element to a second point downstream. Upon impact by a vehicle, the head breaks the first rail post, before impacting the strut and buckling the rail element downstream.