131 resultados para Wisniewski, Irvin
Resumo:
Advanced control techniques like V2, Vout hysteresis or V2Ic can strongly reduce the required output capacitance in PowerSoC converters. Techniques to analyze power converters based on the analysis of the frequency response are not suitable for ripple-based controllers that use fast-scale dynamics to control the power stage. This paper proves that the use of discrete modeling together with Floquet theory is a very powerful tool to model the system and derive stable region diagrams for sensitivity analysis. It is applied to V 2Ic control, validating experimentally that Floquet theory predicts accurately subharmonic oscillations. This method is applied to several ripplebased controllers, providing higher accuracy when it is compared with other techniques based on the frequency response. The paper experimentally validates the usefulness of the discrete modeling and the Floquet theory on a 5 MHz Buck converter with a V 2Ic control.
Resumo:
Documentar los momentos principales del proyecto de la Biblioteca Estatal de Berlín. Hans Scharoun y Edgar Wisniewski. Tres hipótesis y su verificación. Fenomenología; Husserl, Heidegger, Ortega y Gasset y Merleau-Ponty. Kulturforum, desarrollo histórico; Baumgarten, Fahrenkamp, Gutbrod, Scharoun, Wisniewski, Hilmer&Sattler, Stimmann, Düttmann. Textos centrales de Scharoun , 1957; textos centrales de Adolf Arndt. Documentar proyectos colaterales; concurso Amerikagedenk Bibliothek, Philharmonie, Wolfsburg. Propuestas de Werner Düttmann. Encuentro con Wisniewski; croquis iniciales… Concurso Staatsbibliothek; Scharoun, Gutbrod, Bornemann, Spengelin, Ruegenberg, Kramer, Pfau, Seitz, Krahn, Deilmann. Acta del jurado. Plantas publicadas del proyecto 1964, 1967, 1979. Textos centrales de Ulrich Conrads y Edgar Wisniewski, 1978 y 1979. Scharoun-Feininger, una teoría de Matthias Schirren. Fotografías momento de la inauguración, 1978 y en la actualidad. Bibliografía actualizada a 2015. ABSTRACT To document key moments of the project of the State Library in Berlin. Hans Scharoun and Edgar Wisniewski. Three hypotheses and its verification. Phenomenology; Husserl, Heidegger, Ortega y Gasset and Merleau-Ponty. Kulturforum, historical development; Baumgarten, Fahrenkamp, Gutbrod, Scharoun, Wisniewski, Hilmer & Sattler, Stimmann, Düttmann. Main texts of Scharoun, 1957; central texts of Adolf Arndt. To document side projects; contest Amerikagedenk Bibliothek, Philharmonie, Wolfsburg. Werner Düttmann proposals. Meeting with Wisniewski; initial sketches ... Staatsbibliothek competition; Scharoun, Gutbrod, Bornemann, Spengelin, Ruegenberg, Kramer, Pfau, Seitz, Krahn, Deilmann. Brief of the competition‘s jury. Drawing’s Project published 1964, 1967, 1979. Ulrich Conrads and Edgar Wisniewski central texts, 1978 and 1979. Scharoun-Feininger, a theory of Matthias Schirren. Photography time of the inauguration, 1978 and today. 2015 updated bibliography.
Resumo:
V2Ic control provides very fast dynamic performance to the Buck converter both under load steps and under voltage reference steps. However, the design of this control is complex since it is prone to subharmonic oscillations and several parameters affect the stability of the system. This paper derives and validates a very accurate modeling and stability analysis of a closed-loop V2Ic control using the Floquet theory. This allows the derivation of sensitivity analysis to design a robust converter. The proposed methodology is validated on a 5-MHz Buck converter. The work is also extended to V2 control using the same methodology, showing high accuracy and robustness. The paper also demonstrates, on the V2 control, that even a low bandwidth-linear controller can affect the stability of a ripple-based control.
Resumo:
Presented here are femtosecond pump-probe studies on the water-solvated 7-azaindole dimer, a model DNA base pair. In particular, studies are presented that further elucidate the nature of the reactive and nonreactive dimers and also provide new insights establishing that the excited state double-proton transfer in the dimer occurs in a stepwise rather than a concerted manner. A major question addressed is whether the incorporation of a water molecule with the dimer results in the formation of species that are unable to undergo excited state double-proton transfer, as suggested by a recent study reported in the literature [Nakajima, A., Hirano, M., Hasumi, R., Kaya, K., Watanabe, H., Carter, C. C., Williamson, J. M. & Miller, T. (1997) J. Phys. Chem. 101, 392–398]. In contrast to this earlier work, our present findings reveal that both reactive and nonreactive dimers can coexist in the molecular beam under the same experimental conditions and definitively show that the clustering of water does not induce the formation of the nonreactive dimer. Rather, when present with a species already determined to be a nonreactive dimer, the addition of water can actually facilitate the occurrence of the proton transfer reaction. Furthermore, on attaining a critical hydration number, the data for the nonreactive dimer suggest a solvation-induced conformational structure change leading to proton transfer on the photoexcited half of the 7-azaindole dimer.
Resumo:
In many organisms, there are multiple isoforms of cytoplasmic dynein heavy chains, and division of labor among the isoforms would provide a mechanism to regulate dynein function. The targeted disruption of somatic genes in Tetrahymena thermophila presents the opportunity to determine the contributions of individual dynein isoforms in a single cell that expresses multiple dynein heavy chain genes. Substantial portions of two Tetrahymena cytoplasmic dynein heavy chain genes were cloned, and their motor domains were sequenced. Tetrahymena DYH1 encodes the ubiquitous cytoplasmic dynein Dyh1, and DYH2 encodes a second cytoplasmic dynein isoform, Dyh2. The disruption of DYH1, but not DYH2, resulted in cells with two detectable defects: 1) phagocytic activity was inhibited, and 2) the cells failed to distribute their chromosomes correctly during micronuclear mitosis. In contrast, the disruption of DYH2 resulted in a loss of regulation of cell size and cell shape and in the apparent inability of the cells to repair their cortical cytoskeletons. We conclude that the two dyneins perform separate tasks in Tetrahymena.
Resumo:
There is a growing body of evidence, including data from human genetic and T-cell receptor function studies, which implicate a zeta-associated protein of M(r) 70,000 (Zap-70) as a critical protein tyrosine kinase in T-cell activation and development. During T-cell activation, Zap-70 becomes associated via its src homology type 2 (SH2) domains with tyrosine-phosphorylated immune-receptor tyrosine activating motif (ITAM) sequences in the cytoplasmic zeta chain of the T-cell receptor. An intriguing conundrum is how Zap-70 is catalytically activated for downstream phosphorylation events. To address this question, we have used purified Zap-70, tyrosine phosphorylated glutathione S-transferase (GST)-Zeta, and GST-Zeta-1 cytoplasmic domains, and various forms of ITAM-containing peptides to see what effect binding of zeta had upon Zap-70 tyrosine kinase activity. The catalytic activity of Zap-70 with respect to autophosphorylation increased approximately 5-fold in the presence of 125 nM phosphorylated GST-Zeta or GST-Zeta-1 cytoplasmic domain. A 20-fold activity increase was observed for phosphorylation of an exogenous substrate. Both activity increases showed a GST-Zeta concentration dependence. The increase in activity was not produced with nonphosphorylated GST-Zeta, phosphorylated zeta, or phosphorylated ITAM-containing peptides. The increase in Zap-70 activity was SH2 mediated and was inhibited by phenylphosphate, Zap-70 SH2, and an antibody specific for Zap-70 SH2 domains. Since GST-Zeta and GST-Zeta-1 exist as dimers, the data suggest Zap-70 is activated upon binding a dimeric form of phosphorylated zeta and not by peptide fragments containing a single phosphorylated ITAM. Taken together, these data indicate that the catalytic activity of Zap-70 is most likely activated by a trans-phosphorylation mechanism.
Resumo:
Back Row: Assistant Coaches: Larry Gustafson, Bob Thornbladh, Jerry Hanlon, Tirrel Burton, Dennis Brown, Chuck Stobart, Paul Schudel, Gary Moeller, Bill McCartney, Jack Harbaugh, Tom Reed, Dave Elliott, Tim Davis, Lou Angelo, Eqp. Mgr. Jon Falk, Trainer Lindsy McLean
8th Row: Roger Gaudette, Jim Kozlowski, Virgil Williams, Chris Godfrey, Ron Pratl, Dick Novak, Doug Marsh, Irvin Johnson, Keith Gilmore, Jim Humphries, * , Dan Murray, * , Dave Angood
7th Row: Mike Harden, Mel Owens, Michael Davis, George Lilja, Mark Kochanski, John Powers, Chuck Hetts, Bob Taylor, Garrett Quinn, Mike Jolly, Ralph Clayton, John Wangler, David Payne
6th Row: Gerald Diggs, Gary Weber, Lawrence Reid, Gene Bell, Ron Simpkins, Roosevelt Smith, Lewis Smith, William Jackson, Stacy Johnson, Jeff Bednarek, Mike Leoni, Tony Leoni, Jay Allen, Larry Crockett
5th Row: Woody Brown, Gregg Willner, Chris Grieves, Tim Malinak, Mark Braman, * , Jon Giesler, Dave Kadela, Kyron Williams, * , * , Nick Labun, Tom Keller, * .
4th Row: Mgr. Bob Brown, Chip Pederson, Bob Patek, Dale Keitz, Curtis Greer, Tom Seabron, Jerry Meter, John Arbeznik, Mark DeSantis, Bob Hollway, Tom Melita, Mark Torzy, Rock Lindsay, Ed Kasparek
3rd Row: Roger Bettis, * , Dave Harding, Kevin King, Steve Nauta, Max Richardson, Dom Tedesco, Mark Schmerge, Gene Johnson, Russell Davis, Rick Leach, Greg Bartnick, Harlan Huckleby, Mike Smith, Ray Johnson, * .
2nd Row: Roger Szafranski, Jim Pickens, Dwight Hicks, Mark Donahue, Walt Downing, Steve Anderson, Eric Phelps, Rick White, Curt Stephenson, Phil Andrews, Steve Graves, John Anderson, Bill Dufek, Mike Kenn, Derek Howard, Rex Mackall
Front Row: Jim Hackett, Gerry Szara, Jerry Zuver, John Hennessy, Greg Morton, Co-Capt. Calvin O'Neal, Co-Capt. Kirk Lewis, Co-Capt. Rob Lytle, Jim Smith, Bob Wood, Jim Bolden, Bob Lang, Jerry Vogele, John Ceddia, Head Coach Bo Schembechler
* = left the team
Resumo:
Back Row: Asst. coaches Bob Thornbladh, Tom Reed, Jerry Hanlon, Tirrel Burton, Tim Davis, Bill McCartney, Jack Harbaugh, Paul Schudel, Dennis Brown, Don Nehlen, Barry Pierson, Jerry Zuver, Eqp. Mgr. Jon Falk, Trainer Lindsy McLean
8th Row: Marcus Bond, Chuck Christian, Greg Wunderli, Kurt Becker, Tony Osbun, Dan Kwiatkowski, Tom Wandersleben, Fred Motley, Andy Cannavino, Mike Kligis, Jim Breaugh, Oliver Johnson
7th Row: Kirk Yearian, B.J. Dickey, Alan Mitchell, Rodney Feaster, Stanley Edwards, Mike Trgovac, Dave Nicolau, Jeff Jackson, Neal Ginley, Kelley Keough, John Prepolec, Ben Needham, Stuart Harris, Rick Jones
6th Row: Derek Williams, Tony Woodford, Jay Allen, James Humphries, David Payne, Tom Keller, Ron Pratl, Rich Novak, David Angood, Craig Page, Dan Murray, Thomas Moss, Larry Jones, Brian Virgil
5th Row: Roger Gaudette, Virgil Williams, Gerald Diggs, Gene Bell, Dave Kadela, Gary Quinn, Ralph Clayton, Chuck Hetts, Mel Owens, Gary Weber, John Wangler, Keith Gilmore, Irvin Johnson, Tony Leoni, Jim Kozlowski
4th Row: Sr. Mgr. Don DiPaolo, Nick Labun, Mike Harden, Michael Davis, Lawrence Reid, Mike Jolly, John Powers, Chris Godfrey, Jeff Bednarek, George Lilja, Mike Leoni, Doug Marsh, Ron Simpkins, Roosevelt Smith, Gregg Willner, Tim Malinak
3rd Row: Ed Kasparek, Mark Braman, Bob Patek, Stacy Johnson, Dale Keitz, John Arbeznik, Curtis Greer, Jon Giesler, Chip Pederson, Mark DeSantis, Mark Torzy, Rock Lindsay, William Jackson, Bob Hollway, Tom Melita
2nd Row: Max Richardson, Curt Stephenson, Derek Howard, Steve Graves, John Anderson, Bill Dufek, Mark Donahue, Co-captain Walt Downing, Garry Szara, Mike Kenn, Rick White, Dominic Tedesco, Jim Pickens, Kevin King, Co-captain Dwight Hicks, Head Coach Bo Schembechler
Front Row: Raymond Johnson, Roger Bettis, Mike Smith, Russell Davis, Tom Seabron, Gene Johnson, Steve Nauta, Rex Mackall, Greg Bartnick, Dave Harding, Mark Schmerge, Jerry Meter, Rick Leach, Harlan Huckleby, Woody Brown
Resumo:
Back Row: Coaches Bob Patek, Jerry Zuver, Mike Gittleson, Milan Vooletich, Dennis Brown, Jack Harbaugh, Bill McCartney, Jerry Hanlon, Don Nehlen, Tirrel Burton, Paul Schudel, Bob Thornbladh, Barry Pierson, Mike Smith, Curt Stephenson, Trainer Lindsy McLean, Eqp. Mgr. Jon Falk.
9th Row: Kevin Smith, Doug Agnew, * , Mike Butts, Steve Zarnata, Brad Fischer, Kevin Gilligan, * , Karl Tech, Jerome Jelinek, Bill Welch, * , Vince Shaw, Mgr. Nick Uriah
8th Row: Marion Body, Dave Brewster, Rich Strenger, Sanford Washington, Steve Reilly, Tom Neal, Norm Betts, Mike Petsch, Mike Lemirande, Gary Snell, Jeff Reeves, Tony Jackson, Jeff Felten, Tony Kelsie
7th Row: Mike Webster, Butch Woolfolk, Cedric Coles, Bubba Paris, Chuck Rowland, Ed Muransky, Mark Warth, Tom Garrity, Robert Thompson, Jim Paciorek, Gary Lee, Zeke Wallace, Brian Carpenter, John Sandberg
6th Row: Tom Moss, Tim Carrier, Jay Allen, Jim Breaugh, Larry Jones, David Angood, Tom Wandersleben, Fred Motley, Dave Payne, Rod Vaughn, Gasper Calindrino, Kevin Long, Bryan Virgil, *
5th Row: Brad Bates, Irvin Johnson, Kelly Keough, Tom Keller, Rick Novak, Ben Needham, Oliver Johnson, Jeff Jackson, Dan Kwiatkowski, John Prepolec, Greg Wunderli, Kurt Becker, Tony Osbun, Mike Kligis, Chuck Christian
4th Row: Craig Page, B.J. Dickey, Rodney Peaster, Dan Murray, Andy Cannavino, Dave Nicolau, Stanley Edwards, Michael Davis, Mike Trgovac, Stuart Harris, Roger Gaudette, Jim Kozlowski, Alan Mitchell, Rick Jones, Head Coach Bo Schembechler
3rd Row: Gerald Diggs, Tony Leoni, Roosevelt Smith, Gary Weber, Lawrence Reid, Mel Owens, George Lilja, John Powers, Chris Godfrey, John Wangler, Gene Bell, Michael Harden, Mike Leoni, Gary Quinn, Jim Humphries
2nd Row: Gregg Willner, William Jackson, Mike Jolly, Ralph Clayton, Chip Pederson, Rock Lindsay, John Arbeznik, Ron Simpkins, Doug Marsh, Dale Keitz, Tom Melita, Mark Torzy, Tim Malinak, Ed Kasparek, Chuck Netts
Front Row: Mark Braman, Mark DeSantis, Mark Schmerge, Curtis Greer, Greg Bartnick, Harlan Huckleby, Co-Captain Russell Davis, Bill Dufek, Rick Leach, Co-Captain Jerry Meter, Gene Johnson, Jon Giesler, Tom Seabron, Steve Nauta, Bob Hollway
* = left the team
Resumo:
Back Row: ass't coaches Ron Vanderlinden, Bob Thornbladh, Milan Vooletich, Paul Schudel, Dennis Brown, Jack Harbaugh, Bill McCartney, Jerry Hanlon, Don Nehlen, Tirrel Burton, Les Miles, Mike Gittleson, Fritz Seyferth, Jim Kozlowski
9th Row: student manager Tom Anderson, trainer Russ Miller, eqp. manager Jon Falk, Curtis Antrum, Bill Jacoby, Ethington, Robin Koschalk, Scott Roberts, Mike Korowin, Ali Haji-Sheik, Anthony Carter, Chip Pederson, Roger Gaudette, Bob Patek
8th Row: Jerry Burgei, Jeff Cohen, Duke Hayes, John Brown, Jim Herrman, Joe Mosketti, Todd Triplett, Dan Yarano, Bill Bonnell, Paul Girgash, Ken Gear, John Lott, Ricky Davis, Nate Davis
7th Row: Karl Tech, Doug Agnew, Rich Hewlett, Steve O'Donnell, Craig Dunaway, Jerald Ingram, Winfred Carraway, Mike Cade, Jimbo Davis, Keith Bostic, Larry Ricks, Brad Fischer, Kevin Ssmith
6th Row: Brian Carpenter, Vince Shaw, Tom Neal, Dave Brewster, Sanford Washington, Fred Brockington, Mike Lemirande, Rich Strenger, Norm Betts, Tony Kelsie, Mike Petsch, Mike Czarnote, Kevin Longe, Marion Body
5th Row: Jeff Reeves, Jim Paciorek, Butch Woolfolk, Cedric Coles, Tom Garrity, Mark Warth, Ed Muransky, Bubba Paris, Chuck Rowland, Robert Thompson, Zeke Wallace, Gary Lee, Jeff Felten
4th Row: Brad Bates, Jim Breaugh, Oliver Johnson, Fred Motley, Kelly Keough, John Prepolec, Tony Osbun, Dan Kwiatkowski, Chuck Christian, Greg Wunderli, Tom Wandersleben, Mike Kligis, Bryan Virgil, Frank Raiford
3rd Row: Tom Moss, Stan Edwards, Dave Nicolau, Stu Harris, Ben Needham, Kurt Becker, Chuck Hetts, Mike Trgovac, andy Cannavino, Rodney Feaster, B.J. Dickey, Alan Mitchell, Tony Jackson, Irvin Johnson
2nd Row: James Humphries, Gary Quinn, Dan Murray, Tony Leoni, John Wangler, Gary Weber, Mel Owens, George Lilja, Mike Leoni, Lawrence Reid, Roosevelt Smith, David Payne, Tom Keller, Jay Allen
Front Row: Gerald Diggs, Mark Braman, Mike Jolly, John Powers, co-capt. Ron Smpkins, co-capt. John Arbeznik, Curtis Greer, Dale Keitz, Ralph Clayton, Chris Godfrey, Doug Marsh, Mike Harden, coach Bo Schembechler
Resumo:
Back Row: asst. coach Dan Heikkinen, Christopher Bunt, Jay Cantin, Don McLaughlin, Kevin Sullivan, John Mortimer, John Bustic, Steven Lawrence, coach Ron Warhurst
Front Row: Cory Brown, Samyar Dorri, Michael Wisniewski, Kurt Lamson, Tom Stamboulian, Alex Towbin, Todd Snyder
Resumo:
"Contract no. 68-01-1916."
