We report on a theoretical study of the electron transport through laterally-confined, vertical double-barrier resonant-tunneling (DBRT) structures, defined as one-dimensional (1D)-0D-1D systems, with a tunable lateral confinement. The current and the differential conductance of the systems are calculated and the influence caused by varying the lateral confinement on the device characteristics is

Traditional push-and-pull factors have been provided as partial explanations to the size of large urban areas in the third world. In addition to these,the growing literature in the field of economic geography-has identified trade costs as an additional fact-or exacerbating the phenomenon. The present study tests econometrically whether higher trade barriers contribute positive to concentration for

OBJECTIVE: Pulsatile wall motion has been suggested as a means by which to evaluate abdominal aortic aneurysms after exclusion from the circulation to determine whether the treatment has been effective. The objective of this study was to investigate the relations between pulsatile wall motion and both the mean and pulse pressures within the aneurysmal sac for both patent and thrombosed endoleaks.

On the British documentary film during World War 2.

Glucose biosensors based on lyophilised, crystalline and cross-linked glucose oxidase (GOx, CLEC(R)) and commercially available lyophilised GOx immobilised on top of glassy carbon electrodes modified with electrodeposited Prussian Blue are critically compared. Two procedures were carried out for preparing the biosensors: (1) deposition of one layer of adsorbed GOx dissolved in an aqueous solution

A generalized scattering matrix method is presented for spin-dependent electron transport in a quantum waveguide under the modulations of local magnetic field and/or spin-orbit interaction (SOI). All the required Hamiltonian matrices are expressed in terms of a common basis spanned by the products of the transverse spatial eigenstates and the spin eigenstates of the leads. In the formulation we ha

Popular Abstract in Swedish Hållfastheten hos en balk av konstruktionsvirke är beroende av balkens spännvidd och typ av belastning. En längre balk har en lägre hållfasthet än en kort balk på samma sätt som en balk med konstant moment har lägre hållfasthet än en balk belastad med en punktlast. Orsaken till denna längd- och lastberoende bärförmåga är variationen i hållfasthet längs med en balk. VariThe load carrying capacity of a beam of structural timber is dependent both on the span of the beam and the type of loading. The longer the beam and the more uniform the moment distribution, the lower the load carrying capacity. This phenomenon is due to the variability of material properties within a piece of timber. This variability is, in turn, due to the presence of knots, the slope of grain a

Tidigare var den största anledningen till restriktivitet med träning hos gravida rädslan för förhöjd temperatur. Kroppstemperaturen stiger dock inte hos gravida vid upp till submaximal träning på grund av förbättrad temperaturreglering. Det paradoxala fenomenet att kroppstemperaturen sjunker samtidigt som kvinnan känner sig varmare och svettas lättare, tolkar vi som en förbättrad temperaturregleri

The kinetics of a catalyst for hydrocarbon-selective catalytic reduction (HC-SCR) exhaust aftertreatment has been examined by means of transient experiments on a heavy-duty diesel engine rig. The influences of temperature, NO2 concentration, and the transient injection of hydrocarbon on the conversion of NO,, CO, and hydrocarbon were studied in a systematic manner. Hydrocarbon conversion was high