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- Paul, D.J., et al.
(författare)
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n-type Si/SiGe resonant tunnelling diodes
- 2002
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Ingår i: Materials Science & Engineering. - 0921-5107 .- 1873-4944. ; 89:1-3, s. 26-29
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Resonant tunnelling diodes (RTDs) have been fabricated using Si/SiGe heterolayers which demonstrate room temperature performance comparable to III-V technology. Peak current densities up to 282 kA cm-2 with peak-to-valley current ratios (PVCRs) of 2.4 have been demonstrated at room temperature in devices with dimensions of 5 × 5 µm2. Scaling the device size demonstrates that the peak current density is inversely proportional to the device area. It is suggested that this is related to thermal limitations in the device structure. Estimates are also produced for the maximum frequency of oscillations of the diodes which suggest that oscillators may operate with speeds comparable to III-V diodes. © 2002 Elsevier Science B.V. All rights reserved.
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- Paul, D.J., et al.
(författare)
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Si/SiGe electron resonant tunneling diodes with graded spacer wells
- 2001
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 78:26, s. 4184-4186
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Tidskriftsartikel (refereegranskat)abstract
- Resonant tunneling diodes have been fabricated using graded Si1 - xGex (x = 0.3?0.0) spacer wells and strained Si0.4Ge0.6 barriers on a relaxed Si0.7Ge0.3 n-type substrate which demonstrates negative differential resistance at up to 100 K. This design is aimed at reducing the voltage at which the peak current density is achieved. Peak current densities of 0.08 A/cm2 with peak-to-valley current ratios of 1.67 have been achieved for a low peak voltage of 40 mV at 77 K. This represents an improvement of over an order of magnitude compared to previous work. © 2001 American Institute of Physics.
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- Brickel, Sebastian, et al.
(författare)
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Q-RepEx : A Python pipeline to increase the sampling of empirical valence bond simulations
- 2023
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Ingår i: Journal of Molecular Graphics and Modelling. - : Elsevier. - 1093-3263 .- 1873-4243. ; 119
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Tidskriftsartikel (refereegranskat)abstract
- The exploration of chemical systems occurs on complex energy landscapes. Comprehensively sampling rugged energy landscapes with many local minima is a common problem for molecular dynamics simulations. These multiple local minima trap the dynamic system, preventing efficient sampling. This is a particular challenge for large biochemical systems with many degrees of freedom. Replica exchange molecular dynamics (REMD) is an approach that accelerates the exploration of the conformational space of a system, and thus can be used to enhance the sampling of complex biomolecular processes. In parallel, the empirical valence bond (EVB) approach is a powerful approach for modeling chemical reactivity in biomolecular systems. Here, we present an open-source Python-based tool that interfaces with the Q simulation package, and increases the sampling efficiency of the EVB free energy perturbation/umbrella sampling approach by means of REMD. This approach, Q-RepEx, both decreases the computational cost of the associated REMD-EVB simulations, and opens the door to more efficient studies of biochemical reactivity in systems with significant conformational fluctuations along the chemical reaction coordinate.
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- Gabig, TG, et al.
(författare)
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Expression and chromosomal localization of the Requiem gene
- 1998
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Ingår i: Mammalian genome : official journal of the International Mammalian Genome Society. - : Springer Science and Business Media LLC. - 0938-8990. ; 9:8, s. 660-665
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Tidskriftsartikel (refereegranskat)
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| 7. |
- Hodnett, B. K., et al.
(författare)
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The SSPC : Leading the way for next-generation medicines manufacture
- 2015
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Ingår i: European Pharmaceutical Review. - : Russell Publishing. - 1360-8606. ; 20:4, s. 33-37
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Tidskriftsartikel (refereegranskat)abstract
- The Synthesis and Solid State Pharmaceutical Centre (SSPC), a global hub of pharmaceutical process innovation and advanced manufacturing, is funded by Science Foundation Ireland (SFI) and Industry, and represents a unique collaboration between 22 industry partners, nine research performing organisations and 12 international academic collaborators (Figure 1; page 34). It is a €42 million state-industry investment, which supports a globally-leading research team of 38 investigators, 34 post-doctoral researchers and 60 PhD candidates. As the largest research collaboration in Ireland and one of the largest globally within the pharmaceutical area, the SSPC transcends company and academic boundaries (Figure 2; page 34). Its role is to link experienced scientists and engineers in academia and the pharmaceutical industry, to address critical research challenges and to deliver industry-relevant solutions, which result in job growth and retention within the pharmaceutical industry.
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