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126845 full-text articles. Page 3318 of 3447.

A 32-Mw 320-Mhz Continuous-Time Complex Delta-Sigma Adc For Multi-Mode Wireless-Lan Receivers, Jesus Arias, Peter Kiss, Vladimir Prodanov, Vito Boccuzzi, Mihai Banu, David Bisbal, Jacinto San Pablo, Luis Quintanilla, Juan Barbolla 2010 Universidad de Valladolid

A 32-Mw 320-Mhz Continuous-Time Complex Delta-Sigma Adc For Multi-Mode Wireless-Lan Receivers, Jesus Arias, Peter Kiss, Vladimir Prodanov, Vito Boccuzzi, Mihai Banu, David Bisbal, Jacinto San Pablo, Luis Quintanilla, Juan Barbolla

Vladimir I. Prodanov

We present an experimental continuous-time complex delta-sigma multi-bit modulator, implemented in standard 0.25-μm CMOS technology and meeting all major requirements for application in IEEE 802.11a/b/g wireless LAN receivers. The clock frequency is 320 MHz, producing an oversampling ratio of 16 for 20 MHz channel bandwidths. The modulator supports two operation modes for zero-IF and low-IF receiver architectures respectively, requires a single 2.5-V power supply, and dissipates only 32 mW of power. The measured peak signal-to-noise ratio is 55 dB. Further experimental results using sine-wave and OFDM test signals are also presented


A Method For Reducing The Variation In "On" Resistance Of A Mos Sampling Switch, A. Ong, Vladimir Prodanov, M. Tarsia 2010 Bell Laboratories/Lucent Technologies, Murray Hill, NJ

A Method For Reducing The Variation In "On" Resistance Of A Mos Sampling Switch, A. Ong, Vladimir Prodanov, M. Tarsia

Vladimir I. Prodanov

Variation in the “on” resistance of a MOS sampling switch can introduce distortion into the front end of a switched-capacitor filter or analog-to-digital converter. We review three methods commonly used to linearize the resistance of a MOS switch and propose a new technique that addresses their limitations. A practical method for implementation is also suggested.


Complex Low-Pass Filters, Peter Kiss, Vladimir Prodanov, Jack Glas 2010 Agere Systems, Allentown, NJ

Complex Low-Pass Filters, Peter Kiss, Vladimir Prodanov, Jack Glas

Vladimir I. Prodanov

Quadrature zero-if transceivers suffer from the imbalance of the I and Q paths. By using a complex low-pass filter topology instead of a conventional pair of real low-pass filters, this imperfection can be reduced. Both analytical and numerical analysis show that the proposed technique is significantly more robust to circuit imperfections than the traditional architecture.


Cmos Current Mirrors With Reduced Input And Output Voltage Requirements, Vladimir I. Prodanov, Michael M. Green 2010 State University of New York at Stony Brook, Stony Brook, NY

Cmos Current Mirrors With Reduced Input And Output Voltage Requirements, Vladimir I. Prodanov, Michael M. Green

Vladimir I. Prodanov

A CMOS current mirror with lower than VDS(sat) input voltage requirement is presented. It is shown that the structure can be modified to provide cascode-type output resistance for output voltages even lower than 2 VDS(sat). The topology of the proposed current mirror allows low distortion operation from a single 1.5V supply, which makes it attractive for low-voltage applications.


Frequency And Distribution Of Dna Fragmentation As A Marker Of Cell Death In Chronic Liver Diseases, Zhong Jiang, Yu Liu, Louis Savas, Lynda Smith, Herbert Bonkovsky, Stephen Baker, Barbara Banner 2010 University of Massachusetts Medical School

Frequency And Distribution Of Dna Fragmentation As A Marker Of Cell Death In Chronic Liver Diseases, Zhong Jiang, Yu Liu, Louis Savas, Lynda Smith, Herbert Bonkovsky, Stephen Baker, Barbara Banner

Stephen P. Baker

To study the early stages of cell death in various types of chronic liver injury, liver biopsies from a total of 26 patients, including 7 with chronic hepatitis C(CHC), 4 with chronic hepatitis B(CHB), 7 with alcoholic liver disease (ALD), 4 with autoimmune or drug hepatitis (AI/DH), and 4 with primary biliary cirrhosis(PBC), were examined by an in situ nucleotidyl transferase assay (ISNTA), which detects DNA fragmentation. Positive nuclei in hepatocytes and sinusoidal lining cells were counted in all parenchymal areas, excluding triads and areas of fibrosis, using a computer with Sigmascan software. The number of ...


Water Sustainability Initiative, Jerry Schnoor 2010 University of Iowa

Water Sustainability Initiative, Jerry Schnoor

Water Sustainability Initiative Publications

No abstract provided.


Sustainability And Water At The University Of Iowa Facilities Management, Liz Christiansen 2010 University of Iowa

Sustainability And Water At The University Of Iowa Facilities Management, Liz Christiansen

Water Sustainability Initiative Publications

No abstract provided.


Water Resource Sustainability: Our Shared Responsibility, Nandita Basu 2010 University of Iowa

Water Resource Sustainability: Our Shared Responsibility, Nandita Basu

Water Sustainability Initiative Publications

No abstract provided.


Dentifying Challenges In Implementing Sustainable Practices In A Developing Nation., Omidreza Saadatian 2010 Selected Works

Dentifying Challenges In Implementing Sustainable Practices In A Developing Nation., Omidreza Saadatian


No abstract provided.


A Microflow Cytometer On A Chip, Joel P. Golden, Jason Kim, George P. Anderson, Nastaran Hashemi, Peter J. Howell, Frances S. Ligler 2010 Iowa State University

A Microflow Cytometer On A Chip, Joel P. Golden, Jason Kim, George P. Anderson, Nastaran Hashemi, Peter J. Howell, Frances S. Ligler

Nastaran Hashemi

A rapid, automated, multi-analyte Microflow Cytometer is being developed as a portable, field-deployable sensor for onsite diagnosis of biothreat agent exposure and environmental monitoring. The technology relies on a unique method for ensheathing a sample stream in continuous flow past an interrogation region where optical fibers provide excitation and collect emission. This approach efficiently focuses particles in the interrogation region of the fluidic channel, avoids clogging and provides for subsequent separation of the core and sheath fluids in order to capture the target for confirmatory assays and recycling of the sheath fluid. Fluorescently coded microspheres provide the capability for highly ...


East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium 2010 Roger Williams University

East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.


East Bay Energy Consortium, Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium 2010 Roger Williams University

East Bay Energy Consortium, Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.


East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium 2010 Roger Williams University

East Bay Energy Consortium Joint Committee Workshop At The Bristol Town Hall, Burnside Building, February 24, 2010, Meeting Notes, East Bay Energy Consortium

East Bay Energy Consortium Meeting Minutes

No abstract provided.


Phosphate Industry And The Radon Problem, Fathi Habashi 2010 Laval University, Quebec City, Canada

Phosphate Industry And The Radon Problem, Fathi Habashi

Fathi Habashi

The problem of radon generated during the treatment of phosphate rock by sulfuric acid to produce fertilizers can be solved by using nitric acid. In this case radium, which is the source of radon, goes into solution and can be precipitated by a controlled method and safely disposed of. A variety of options are discussed. Text in Farsi with English translation.


Temperature Dependence Of Thermal Conductivity Enhancement In Single-Walled Carbon Nanotube/Polystyrene Composites, Michael B. Jakubinek, Mary Anne White, Minfang Mu, Karen I. Winey 2010 Dalhousie University

Temperature Dependence Of Thermal Conductivity Enhancement In Single-Walled Carbon Nanotube/Polystyrene Composites, Michael B. Jakubinek, Mary Anne White, Minfang Mu, Karen I. Winey

Departmental Papers (MSE)

The thermal conductivity of single-walled carbon nanotube (SWCNT)/polystyrene composites, prepared by a method known to produce a uniform distribution of SWCNT bundles on the micrometer length scale, was measured in the temperature range from approximately 140 to 360 K. The thermal conductivity enhancement (50% for 1 mass % at 300 K) is reasonably constant above room temperature but is reduced at the lower temperatures. This result is consistent with the expected, large contribution of interfacial thermal resistance in SWCNT/polymer composites. Enhancements in electrical conductivity show that 1 mass % loading is in the region of the electrical percolation threshold.


Benefits And Pitfalls Of Virtual R&D Teams: An Empirical Study, Nader Ale Ebrahim, Shamsuddin Ahmed, Zahari Taha 2010 University of Malaya

Benefits And Pitfalls Of Virtual R&D Teams: An Empirical Study, Nader Ale Ebrahim, Shamsuddin Ahmed, Zahari Taha

Nader Ale Ebrahim

In this paper, advantages and drawbacks of virtual teams in research and development (R&D) are studied. With the globalization of commercial practices and advances in information and communication technologies, increasing numbers of enterprises are establishing cross-functional, geographically distributed virtual teams. Virtual teams in R&D are designed to access external resources and knowledge to maximize the competitive advantage from limited labor and resources. A survey has been conducted on 210 Malaysian and Iranian manufacturing companies, aimed to investigate the characteristics of R&D collaborations and extract the main advantages/disadvantages’ factors of virtual teams. These factors can be a ...


Symmetry Transition In Thin Films Of Diblock Copolymer/Homopolymer Blends, Vindhya Mishra, Su-Mi Hur, Eric W. Cochran, Gila E. Stein, Glenn H. Fredrickson, Edward J. Kramer 2010 University of California, Santa Barbara

Symmetry Transition In Thin Films Of Diblock Copolymer/Homopolymer Blends, Vindhya Mishra, Su-Mi Hur, Eric W. Cochran, Gila E. Stein, Glenn H. Fredrickson, Edward J. Kramer

Chemical and Biological Engineering Publications

The effect of blending small weight fractions of low molecular weight majority block homopolymer on the structure of multilayer films of spherical morphology poly(styrene-b-2vinylpyridine) [PS−P2VP] has been studied. The structure of the films was characterized with grazing-incidence small-angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). In multilayer films of PS−P2VP, competition between hexagonal packing of the spherical domains preferred at the surfaces with the BCC (110) packing preferred by the internal layers leads to a transition in the packing symmetry as the number of sphere layers (n) is increased.(1) Neat PS−P2VP exhibits ...


Frequency Response And Gain Enhancement Of Solid-State Impact-Ionization Multipliers (Sims), Joshua L. Beutler 2010 Brigham Young University - Provo

Frequency Response And Gain Enhancement Of Solid-State Impact-Ionization Multipliers (Sims), Joshua L. Beutler

All Theses and Dissertations

A study of the frequency response and gain of Solid-state the Impact-ionization Multiplier (SIM). The SIM generates current gain via impact ionization also known as avalanche gain. The SIM provides low noise amplification from an arbitrary current source. In the case of this study, current sources consisted of photodiodes optimized for a particular wavelength of light. The SIM is fabricated from silicon and enjoys the low noise, low carrier transit time advantages of conventional silicon impact ionization devices while amplifying current from a photodiode of a different material. This is advantageous because ideal detection and multiplication regions cannot always be ...


The Carillon And Its Haptic Signature : Modeling The Changing Force-Feedback Constraints Of A Musical Instrument For Haptic Display, Mark Havryliv, F. Geiger, M. Gurtler, Fazel Naghdy, Greg Schiemer 2010 University of Wollongong

The Carillon And Its Haptic Signature : Modeling The Changing Force-Feedback Constraints Of A Musical Instrument For Haptic Display, Mark Havryliv, F. Geiger, M. Gurtler, Fazel Naghdy, Greg Schiemer

Greg Schiemer

The carillon is one of the few instruments that elicits sophisticated haptic interaction from amateur and professional players alike. Like the piano keyboard, the velocity of a player’s impact on each carillon key, or baton, affects the quality of the resultant tone; unlike the piano, each carillon baton returns a different force-feedback. Force-feedback varies widely from one baton to the next across the entire range of the instrument and with further idiosyncratic variation from one instrument to another. This makes the carillon an ideal candidate for haptic simulation. The application of synthesized forcefeedback based on an analysis of forces ...


Optimized Stochastic Resonance Method For Signal Detection And Image Processing, Hao Chen, P. K. Varshney, J. H. Michels 2010 Boise State University

Optimized Stochastic Resonance Method For Signal Detection And Image Processing, Hao Chen, P. K. Varshney, J. H. Michels

Hao Chen

Apparatus and method for improving the detection of signals obscured by noise using stochastic resonance noise. The method determines the stochastic resonance noise probability density function in non-linear processing applications that is added to the observed data for optimal detection with no increase in probability of false alarm. The present invention has radar, sonar, signal processing (audio, image and video), communications, geophysical, environmental, and biomedical applications.


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