175,284 research outputs found
High performance of W-band MMICs using 60nm InGaAs HEMT technology
No full textA W-band coplanar wave-guide MMIC (a mixer, an oscillator and an ultra broad-band distributed amplifier) has been successfully developed by 60nm gate length InGaAs HEMT technology. 60nm gate length was defined by Si 3N 4SiO 2 sidewall process. The device exhibits good DC and microwave characteristics of V th = -0.65 V, breakdown voltage = -4.1V, extrinsic G m,max = 1.15S/mm, f T= 250 GHz and f max of 263GHz. A mixer exhibits conversion loss of 7dB with 94GHz LO signal and 90GHz RF signal. An oscillator exhibits output power of -4dB at 96GHz. A broadband distributed amplifier achieves small signal gain of 6.6 dB over 0.4∼110GHz. © 2004 IEEE.N
W-band low-noise amplifier with 50 nm In<inf>0.8</inf>GaP/In<inf>0.4</inf>AlAs/In<inf>0.35</inf>GaAs metamorphic HEMT
No full textW-band low-noise amplifier (LNA) has been successfully demonstrated with 50 nm metamorphic HEMT (MHEMT) technologies. 50 nm MHEMT showed a g m.max of 760 mS/mm, a fT of 216 GHz, and a fmax of 400 GHz in spite of indium content of 35 % in the channel. W-band LNA with three-stage showed the small signal gain of 9.4 ± 1.8 dB from 40 GHz to 110 GHz. These results are well suited for high frequency applications.N
W-band divide-by-3 frequency divider using 0.1 mu m InAlAs/InGaAs metamorphic HEMT technology
No full textA W-band divide-by-3 frequency divider with wide bandwidth and low power dissipation is presented using harmonic injection-locking technique. A cascode FET is employed for a self-oscillating second-harmonic mixer which is injection-locked by third-harmonic input to obtain the division order of three. The fabricated frequency divider using 0.1 mu m GaAs metamorphic HEMT technology shows superior performance such as large bandwidth of 6.1 GHz around 83.1 GHz (7.3%) under small DC power consumption of 12 mWN
Prof. Th. W. Adorno and the author Hans Erich Nossack.
No full textProf. Th. W. Adorno and the author Hans Erich Nossack at a reception of Insel Verlag, Buchmesse Frankfurt 1966LB
The flip-chip mounted mmic technology using the modified mcmd substrate for compact and low-cost w-band transceiver
No full textWe present novel mufti-chip module (MCM)-D technology to improve the mechanical and thermal properties of a MCM-D substrate for a motherboard of the flip-chip structure. Advantages of the flip-chip mounted MMIC technology using the modified MCM-D substrate were investigated. Based on this investigation the W-band CPW MMIC amplifier using the 0.1-mu m GaAs pHEMT was successfully mounted on the modified MCNI-9 substrate by means of the flip-chip technology. Moreover, the W-band down-converter module with internal local oscillator (LO) source was realized with this technology.N
Nowe spojrzenie na planowanie architektury mieszkaniowej w afryce subsaharyjskiej
No full textThe author shares his reflections on state of art in housing and urban planning, deficiencies, expectations and possibilities in the Sahel region of Africa. He notices, that the housing problem in Africa is one of the challenges, which should be solved in order to recover life dignity of African people and secure their rights to traditional family life in acceptable conditions. The paper describes the studies on the typical dispersed urban structures and the need to foster this type of settlement structure and proposals of introduction of new on light steel frame housing system in the area of Sahel, combining the traditional way of building houses with modern technology. The particularly analysed case, is the housing problem in the Republic of Chad. The author presents the basic discussion on this topic and his architectural proposals. Unfortunately, the gap between the needs and the financial feasibility of housing construction in this area, makes this project already at the starting point extremely difficult to be realized without external subventions.Problem mieszkaniowy w Afryce jest jednym z wyzwań, które należy rozwiązać, aby Afrykanie mogli odzyskać godność życiową i zabezpieczyć swoje prawa do tradycyjnego życia rodzinnego w akceptowalnych warunkach. W artykule opisano badania nad typowymi rozproszonymi strukturami miejskimi i potrzebą wspierania tego typu struktur osadniczych oraz propozycji wprowadzenia nowego systemu konstrukcji domów, opartym na lekkim szkielecie stalowym, łączącym tradycyjny sposób budowania domów z nowoczesną technologią. Przypadkiem szczególnie analizowanym jest problem mieszkaniowy w Republice Czadu. Autor przedstawia podstawową dyskusję na ten temat i swoje propozycje architektoniczne. Niestety luka między potrzebami mieszkaniowymi w Czadzie a finansową wykonalnością budownictwa mieszkaniowego w tym obszarze sprawia, że projekt ten, już w punkcie wyjścia, jest niezwykle trudny do realizacji bez uzyskania zewnętrznych dotacji
Effects of tungsten on corrosion and kinetics of sigma phase formation of 25% chromium duplex stainless steels
No full textDuplex stainless steels (DSS) of 25% Cr-7% Ni-x% Mo-y% W-0.25% N (x = 1.5 to 3, and y = 0 to 3) were designed with the same pitting resistance equivalent (PRE) value of 42 by varying the contents of Mo and W. Effects of W on pitting and stress corrosion of the solution-annealed or aged alloys in chlorides were examined using anodic polarization testing, critical pitting temperature measurements, and slow strain rate testing. Influences of W on degradation of mechanical properties of the alloys caused by precipitation of secondary phases during aging at 850 degrees C were investigated using the Charpy impact and tensile tests, x-ray diffraction, and backscattered scanning electron microscopy. Resistance to pitting and stress corrosion increased with the ratio of W to Mo content. During aging, the alloys were embrittled rapidly by precipitation of the sigma (sigma) phase, with the rate of embrittlement delayed significantly by increases in W content. Thus, the alloy containing 3% W-1.5% Mo exhibited the highest resistance to pitting and stress corrosion in the solution-annealed rendition and the highest resistance to embrittlement induced by aging. The degree of degradation in corrosion and mechanical properties of the alloys during aging was associated closely with the amount of sigma precipitates. Addition of W to 25% Cr DSS retarded nucleation and growth of the sigma phase during aging, thereby delaying degradation of the corrosion and mechanical properties of the alloys. Retardation of precipitation of the sigma phase by W during aging resulted from its inherently slower diffusion rate compared to that of Mo. W in the alloys caused preferential precipitation of the chi (chi) phase along the grain boundaries and, hence, inhibited nucleation and growth of the sigma phase by depleting W and Mo around the chi precipitates, This beneficial effect of W on retardation of sigma phase precipitation was most dominant in the alloy containing 3% W and 1.5% Mo
Seeing the world anew : the radical vision of Martin Waldseemüller's 1507 & 1516 world maps /
No full text9781929154470 (ISBN). 192915447X (ISBN). First edition 2012. Accompanied by 2 foldeds map in front and back pockets: 1507 map -- 1516 map.; Includes bibliographical references: pages 98-107.; Maps from pockets also available online http://nla.gov.au/nla.map-vn6254227; Original version of the 1507 map: Universalis cosmographiae secundum Ptholomaei traditionem et Americi Vespucii alioru que lustrationes. [St. Dié, France? : s.n., 1507]; Original version of the 1516 map: Carta marina, navigatoria Portugallen, navigationes atque tocius cogniti orbis terre marisque formam naturamq[u]e situs et terminos nostris temporibus recognitos et ab antiquorum traditione differentes eciam quor[um] vetusti non meminerunt auctores hec generaliter indicat / consumatum est in oppido S. Deodati compositione et digestione Martini Waldseemuller Ilacomili. [St. Dié, France? : s.n., 1516]. Prologue: In a Renaissance Vision, a Glimpse of the Modern / John W. Hessler -- "An island surrounded on all sides by sea" : The World Map, 1507 / John W. Hessler -- "Land of Cuba, part of Asia" : The Carta marina, 1516 / Chet Van Duzer -- Epilogue: A Renaissance That Resonates Still / John W. Hessler -- Notes -- Afterword / Ralph E. Ehrenberg -- About the authors -- Acknowledgments -- The Maps: The 1507 World Map, 12 sheets, with commentary -- Composite: front pocket -- The 1516 Carta marina, 13 sheets, with commentary -- Composite: back pocket
- …
