Field induced gap infrared detector

A tunable infrared detector which employs a vanishing band gap semimetal material provided with an induced band gap by a magnetic field to allow intrinsic semiconductor type infrared detection capabilities is disclosed. The semimetal material may thus operate as a semiconductor type detector with a wavelength sensitivity corresponding to the induced band gap in a preferred embodiment of a diode structure. Preferred semimetal materials include Hg(1-x)Cd(x)Te, x is less than 0.15, HgCdSe, BiSb, alpha-Sn, HgMgTe, HgMnTe, HgZnTe, HgMnSe, HgMgSe, and HgZnSe. The magnetic field induces a band gap in the semimetal material proportional to the strength of the magnetic field allowing tunable detection cutoff wavelengths. For an applied magnetic field from 5 to 10 tesla, the wavelength detection cutoff will be in the range of 20 to 50 micrometers for Hg(1-x)Cd(x)Te alloys with x about 0.15. A similar approach may also be employed to generate infrared energy in a desired band gap and then operating the structure in a light emitting diode or semiconductor laser type of configuration

Superior memory efficiency of quantum devices for the simulation of continuous-time stochastic processes

Continuous-time stochastic processes pervade everyday experience, and the simulation of models of these processes is of great utility. Classical models of systems operating in continuous-time must typically track an unbounded amount of information about past behaviour, even for relatively simple models, enforcing limits on precision due to the finite memory of the machine. However, quantum machines can require less information about the past than even their optimal classical counterparts to simulate the future of discrete-time processes, and we demonstrate that this advantage extends to the continuous-time regime. Moreover, we show that this reduction in the memory requirement can be unboundedly large, allowing for arbitrary precision even with a finite quantum memory. We provide a systematic method for finding superior quantum constructions, and a protocol for analogue simulation of continuous-time renewal processes with a quantum machine.Comment: 13 pages, 8 figures, title changed from original versio

Economic Reform and Alternatives for North Korea

This chapter assesses the potential for reform in North Korea, and considers the lessons learned from economic reform and transition in China, the Soviet Union, and Central Europe. We focus in particular on the importance of reforms in the financial regime, and argue that in the absence of a major change in North Korea?s environment, such as a crisis caused by reduced economic and/or political support from China, or increased access by the North Korean population to events in the rest of the world, the current situation is likely to continue for many years. North Korea will thus continue to alternate between declining, stagnant or mediocre economic growth. It will also continue to be a source of geo-political instability in the world in general and Asia in particular.Economic Reform; North Korea; Price Liberalization

Asian finance and the role of bankruptcy

The degree to which bankruptcy is permitted to play a role in the allocation of capital is a key distinction between the Asian state-directed financial regime and the Western market-directed version. The paper discusses the two approaches to finance and argues that a major problem with the bank finance model used in many Asian countries is its minimization of bankruptcy risks. A three-sector development model (agriculture, manufacturing, and financial sector) is developed and simulated to compare the outcomes of the two approaches separately and then to evaluate the transition costs of switching from a state- to a market-directed financial regime. The simulation results suggest that the market approach results in a higher long-run growth path because it eliminates inefficient firms through bankruptcy. The results also suggest that switching from a state- to a market-directed model can be very costly to the economy, though the transition costs can be lowered somewhat by a delayed and phased-in liberalization. At the same time, a delayed and phased-in approach may induce other difficulties not considered in the model. Several policy implications are drawn from the model and simulation results; for example, development of an infrastructure to provide for orderly bankruptcy and the development of money and capital markets should be given high priority in the liberalization process.Banks and banking - Asia ; Bankruptcy

Linked Ancient World Data Institute

We propose two three-day sessions of an Institute designed to train scholars on the use of Linked Data in online publication for ancient studies. Participants will work with a cadre of experienced scholars and technologists who will guide them through a hands-on overview of current best practice, equipping them to make their own intellectual content discoverable and re-usable in a highly networked world

Sensitivity of Pagurus bernhardus (L.) to substrate-borne vibration and anthropogenic noise

© 2015 Elsevier B.V. Despite the prevalence of vibration produced by anthropogenic activities impacting the seabed there are few data and little information as to whether these are detected by crustaceans and whether they interfere with their behaviour. Here the sensitivity of unconditioned Pagurus bernhardus to substrate-borne vibration was quantified by exposure to sinusoidal vibrations of 5-410Hz of varied amplitudes using the staircase method of threshold determination, with threshold representing the detection of the response and two behavioural responses used as reception indicators: movement of the second antenna and onset or cessation of locomotion. Thresholds were compared to measured vibrations close to anthropogenic operations and to the time in captivity prior to tests. Behaviour varied according to the strength of the stimulus with a significant difference in average threshold values between the two behavioural indicators, although there was an overlap between the two, with overall sensitivity ranging from 0.09-0.44ms -2 (root mean squared, RMS). Crabs of shortest duration in captivity prior to tests had significantly greater sensitivity to vibration, down to 0.02ms -2 (RMS). The sensitivity of P. bernhardus fell well within the range of vibrations measured near anthropogenic operations. The data indicate that anthropogenic substrate-borne vibrations have a clear effect on the behaviour of a common marine crustacean. The study emphasises that these vibrations are an important component of noise pollution that requires further attention to understand the long term effects on marine crustaceans