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Article
Electroluminescence from AlGaAs/GaAs quantum-cascade structures in the terahertz range
Electroluminescence from a quantum-cascade structure comprising 40 periods of GaAs/Al0.15Ga0.85As tunnel-coupled quantum wells (QW) was studied. A terahertz emission band in the range 1.0–1.8 THz is observed unde...
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Article
Terahertz injection electroluminescence in multiperiod quantum-cascade AlGaAs/GaAs structures
Terahertz electroluminescence in the range ≈1.5 THz was observed in a quantum-cascade GaAs/AlGaAs structure containing 40 periods of tunnel-coupled wells. The luminescence is caused by the spatially indirect o...
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Article
Anisotropy of electronic wave functions in self-assembled InAs dots embedded in the center of a GaAs quantum well studied by magnetotunneling spectroscopy
We present an experimental study of electron wave functions in InAs/GaAs self-assembled quantum dots by magnetotunneling spectroscopy. The electronic wave functions have a biaxial symmetry in the growth plane,...
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Article
Observation of the interaction between Landau levels of different two-dimensional subbands in GaAs in a normal magnetic field
Tunnel current measurements between strongly disordered two-dimensional electron systems in a perpendicular magnetic field are presented. Two-dimensional electron accumulation layers are formed by an extremely...
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Article
UK Core Transmission Network for the New Millennium
The capacity of the BT/UK core transport network is being increased by more than 100% per year to support the growing demands from IP/ATM broadband data services and the traditional private services platform. ...
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Chapter
The Stark Effect and Electron-Hole Wavefunctions in InAs-GaAs Self-Assembled Quantum Dots
New information on the electron-hole wavefunctions in InAs-GaAs self-assembled quantum dots is obtained from study of the quantum confined Stark effect. From the sign of asymmetry observed in the Stark effect,...
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Article
Photocurrent Spectroscopy of InAs/GaAs Self-Assembled Quantum Dots: Observation of a Permanent Dipole Moment
Photocurrent spectroscopy of InAs/GaAs self-assembled quantum dots, studied as a function of applied electric field, is used to probe the nature of the confined electronic states. A field asymmetry of the quan...
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Article
1.55 Micron Emission from InAs/InP Self-Assembled Quantum Dots
Self-assembled InAs/InP and InAs/InGaAsP quantum dots (QDs) grown by metal-organic chemical vapour epitaxy (MOVPE) exhibit emission at 1.5–1.6 μm at room temperature. P-I-N diodes incorporating a single InAs/I...
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Article
Abstracts from the twenty-third meeting of the pancreatic society of Great Britain and Ireland at the Village Hotel, Leeds, UK
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Article
Project Appraisal for the Keynesian Investment Planner
This paper outlines a theory of project appraisal wherein the neoclassical premises of conventional cost-benefit analysis are replaced by their Keynesian counterparts. The paper shows how the social rate of re...
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Article
Effect of dietary zinc supplementation and phytase pre-treatment of soybean meal or corn gluten meal on growth, zinc status and zinc-related metabolism in rainbow trout, Oncorhynchus mykiss
Rainbow trout, Oncorhynchus mykiss, were fed diets containing untreated or phytase-treated soybean meal and corn gluten meal with or without 50 mg supplemental zinc kg−1 to determine if dietary phytate caused ...
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Article
Implementing an open link service for the World Wide Web
Links are the key element for changing a text into a hypertext, and yet the WWW provides limited linking facilities. Modeled on Open Hypermedia research the Distributed Link Service provides an independent sys...
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Chapter
Intersubband Electroluminescence from GaAs/AIGaAs Triple Barrier and Quantum Cascade Structures
This paper reports: (1) the first observation of intersubband electroluminescence from a single period resonant tunnelling structure; and (2) the observation of intersubband electroluminescence from GaAs/AlGaAs-b...
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Article
Incidence and mortality of neuroblastoma in Canada compared with other childhood cancers
The incidence and mortality of neuroblastoma was reviewed in thegeneral context of childhood cancer in Canada for the periods 1982-86 and1987-91. This was done to complement the preliminary work of the QuebecN...
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Chapter
Close Binary Stars (Étoiles Doubles Serrées)
The pervasive connection of Close Binary Stars (CBS) with essentially every fundamental field of astronomy and astrophysics has required a huge number of papers on many topics to be considered for this report....
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Chapter
Identification of Tunneling Mechanisms through GaAs/AlAs/GaAs Single Barrier Structires
We have identified the Γ-X and X-Γ intervalley tunneling mechanisms in GaAs/AlAs/GaAs single barrier p-i-n structures by employing electroluminescence and transfort techniques. We show that the Γ-X-Γ tunneling...
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Chapter
Magnetic and Electric Field Effects in Semiconductor Quantum Microcavity Structures
The effects of magnetic and electric field on the vacuum Rabi exciton-photon coupling in semiconductor quantum microcavity structures are presented. A number of phenomena are described including marked increas...
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Article
Vacuum rabi splitting in semiconductor microcavities with applied electric and magnetic fields
We describe the use of measurements of vacuum Rabi splitting to extract values for the exciton oscillator strengths in In0.13Ga0.87As-GaAs and GaAs-Al0.2Ga0.8As quantum wells. By varying both field and temperatur...
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Article
Book reviews
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Chapter
Preservation of cosmetics and toiletries
With the manufacture of cosmetics and toiletries on an industrial scale it became from the commercial point of view very important to maintain the integrity of the products released for sale. Manufacturers, th...
