We present a new technique allowing us to build freely suspended two-dimensional electron gases from AlGaAs/GaAs/AlAs heterostructures. This technique relies on an MBE-grown structures that includes a sacrificial layer. ( 1998 Elsevier Science B.V. All rights reserved.

background: nutritional education is a necessity in diabetic patients to better control of the disease. the aim of this study was to determine the effectiveness of educational programs to promote nutritional knowledge in type ii diabetes patients using the health belief model (hbm). methods: this was a quasi-experimental study which was performed among type ii diabetic patients referred to rura...

background: type ii diabetes is the most prevalent disease with numerous complications. adherence to treatment is an effective role on promoting health outcomes. this study aimed to assess the cognitive adaptation in treatment adherence and its relative factors in coping with disease among type ii diabetic patients. methods: this was a cross-sectional study which was conducted in 2012. study po...

In this letter, we examine the potential of a functional device that can have good transistor and stress sensor properties. The device examined is based on the use of a thin oxide with high piezoelectric coefficients under the gate region. Channel charge and current are controlled by gate voltage or by stress. We examine the performance of two classes of heterostructures that are important semi...

Type-II core/shell CdTe/CdSe quantum dots (QDs) were synthesized in aqueous medium by employing thiol-capped CdTe QDs as core template and CdCl(2) and Na(2)SeSO(3) as shell precursors, respectively. Compared with the original CdTe cores, the core/shell CdTe/CdSe QDs showed an obvious red-shifted emission with the color-tune capability to the near-infrared (NIR) wavelength, because of the format...

Structural and electronic properties of two-dimensional stanene and graphene heterostructure (Sn/G) are studied by using first-principles calculations. Various supercell models are constructed in order to reduce the strain induced by the lattice mismatch. The results show that stanene interacts overall weakly with graphene via van der Waals (vdW) interactions. Multiple phases of different cryst...

We have investigated the theory of the plasmon-plariton niodes of a pr iodic metallic heterostructure d i n g use of a local theory. A rich spectrum is found of b t h buU: and surface excitations whose freguency depends upon the dielectric properties of each constituent. We discuss the connections of our analysis with the results obtained within a non-local theory and the effects of retardation...

purpose: to evaluate color vision in patients with type ii diabetes mellitus without diabetic retinopathy and compare the results with those of age- and sex- matched normal individuals. methods: this descriptive, comparative study was conducted on 100 diabetic patients without any sign of retinopathy and 100 age- and sex-matched normal subjects. color vision was evaluated using ishihara and far...

introduction:diabetes is a significant and expensive health problem which had influenced all the ages in almost all the countries. increasing prevalence of this disease has been caused by continued changes in lifestyle such as unsuitable nutrition, lack of physical activities and fatness which is often related to modern city life, mechanization and industrialization. it is an expensive disease,...