A5017399520- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Photochemistry and Electron Transfer Studies
- Semiconductor Quantum Structures and Devices
- Electrochemical Analysis and Applications
- Spectroscopy and Quantum Chemical Studies
- Photonic Crystals and Applications
- Terahertz technology and applications
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Laser Applications
- Molecular Junctions and Nanostructures
- Optical Coherence Tomography Applications
- Superconducting and THz Device Technology
- Free Radicals and Antioxidants
- Analytical Chemistry and Chromatography
- Advanced Chemical Physics Studies
- Luminescence and Fluorescent Materials
- Photoreceptor and optogenetics research
- Oxidative Organic Chemistry Reactions
- Protein Interaction Studies and Fluorescence Analysis
- Phase Equilibria and Thermodynamics
- Chemical Synthesis and Reactions
- Analytical Chemistry and Sensors
- Radical Photochemical Reactions
- Lanthanide and Transition Metal Complexes
University of Sheffield
2011-2021
Engineering and Physical Sciences Research Council
2008-2021
IQE (United Kingdom)
2018-2021
Ventana Research Corporation (United States)
2014-2016
West Virginia University
2016
University of South Florida
1985-1997
Biotechnology and Biological Sciences Research Council
1992
Quadram Institute
1992
Royal Children's Hospital
1969-1973
Commonwealth Scientific and Industrial Research Organisation
1972
Duodenal mucosa obtained from two patients with Menkes' syndrome contained abnormally large amounts of copper. The defect in copper absorption this disease must lie the process intracellular handling or transport across serosal cell membrane. Fibroblastic cells cultured skin and heterozygous females show intense metachromasia primary culture which disappears subculture. These may be useful for study vitro identification heterozygotes affected families.
B. Stevens and M. I. Ban, Trans. Faraday Soc., 1964, 60, 1515 DOI: 10.1039/TF9646001515
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoperoxidation of unsaturated organic molecules. XIV. O21.DELTA.g acceptor properties and reactivityB. Stevens, Steven R. Perez, Jose A. OrsCite this: J. Am. Chem. Soc. 1974, 96, 22, 6846–6850Publication Date (Print):October 1, 1974Publication History Published online1 May 2002Published inissue 1 October 1974https://pubs.acs.org/doi/10.1021/ja00829a006https://doi.org/10.1021/ja00829a006research-articleACS PublicationsRequest reuse...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoperoxidation of unsaturated organic molecules. I. Relaxation and oxygen-quenching parameters the sensitizer singlet stateB. Stevens B. E. AlgarCite this: J. Phys. Chem. 1968, 72, 7, 2582–2587Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://pubs.acs.org/doi/10.1021/j100853a055https://doi.org/10.1021/j100853a055research-articleACS PublicationsRequest reuse permissionsArticle...
A modification of the thickness low-growth-temperature component GaAs spacer layers in multilayer 1.3μm InAs∕GaAs quantum-dot (QD) lasers has been used to significantly improve device performance. For a p-doped seven-layer device, reduction this from 15to2nm results reduced reverse bias leakage current and an increase intensity spontaneous emission. In addition, significant threshold density external differential efficiency at room temperature are obtained. These improvements indicate defect...
Abstract —The use of competitive methods with rubrene as reference acceptor provides values the rate constants k B Q = 2.3 times 10 9 / mol ‐1 s and v q 3.3 for physical quenching O 2 1 δg, by bilirubin (in CCl 4 ) biliverdin CHCl 3 respectively attributed to electron energy transfer processes. The constant R 1.7 8 reaction δg is considerably greater than that ‐ which has identical δa, sites, a primary Type I oxidation process followed slower II addition products.
A GaAs-based epitaxially regrown photonic crystal surface-emitting laser is proposed and demonstrated at room temperature. The band-structure mapped through the angular dependence of subthreshold electroluminescence, allowing coupling coefficients to be determined.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation B. Stevens, M. F. Thomaz, J. Jones; Intersystem Crossing in Pyrene. Chem. Phys. 1 January 1967; 46 (1): 405–406. https://doi.org/10.1063/1.1840417 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown Menu input auto suggest...
B. Stevens, J. Chem. Soc., 1953, 2973 DOI: 10.1039/JR9530002973
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoperoxidation of unsaturated organic molecules. 21. Sensitizer yields O21.DELTA.gB. Stevens, K. L. Marsh, and J. A. BarltropCite this: Phys. Chem. 1981, 85, 21, 3079–3082Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981https://pubs.acs.org/doi/10.1021/j150621a013https://doi.org/10.1021/j150621a013research-articleACS PublicationsRequest reuse permissionsArticle...
The use of the excited state quantum dot lasers for high speed direct modulation is proposed and demonstrated. A comparison utilizing ground from same laser material reveals a factor two increase in K-factor limited bandwidth. This attributed to an saturated gain reduced carrier scattering time compared state.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoperoxidation of unsaturated organic molecules. 16. Excitation energy fissionB. Stevens and J. A. OrsCite this: Phys. Chem. 1976, 80, 20, 2164–2165Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 September 1976https://pubs.acs.org/doi/10.1021/j100561a005https://doi.org/10.1021/j100561a005research-articleACS PublicationsRequest reuse permissionsArticle Views66Altmetric-Citations36LEARN...
We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence the elements is verified through demonstration Young's Slits experiment. In addition to allowing all-electronic control interference pattern, this type device offers new routes power and brightness scaling in lasers,...
The dependence of fluorescence intensity on the wavelength exciting radiation has been recorded for anthracene vapour at 0·09 mm and 170°C over range 230–366 mμ. It is shown that whereas photon cascade theory cannot account much higher excited in 250 mμ band than 363 mμ, this behaviour precisely expected if fluorescent state populated by internal conversion following excitation short-wave band. Since molecules are collisionally unperturbed under these conditions, spectrum exhibits a marked...