Polarization enhanced GaN separate absorption and multiplication ultraviolet avalanche photodiodeswith an ScGaN interlayer.

This article proposes a separate absorption and multiplication (SAM) GaN-based avalanche photodiode (APD) that achieves both high gain and low operating voltage by applying Sc-based ferroelectric material ScGaN in APDs. The avalanche gain of the proposed SAM APD with a low Sc composition p-ScGaN insertion layer reaches 7.2 × 10, which is 60% higher than that of a conventional p-i-p-i-n GaN-based APD.

Effect of Rapid Thermal Annealing on Si-Based Dielectric Films Grown by ICP-CVD.

Silicon nitride, silicon oxide, and silicon oxynitride thin films were deposited on the Si substrate by inductively coupled plasma chemical vapor deposition and annealed at 1100 °C for 3 min in an Ar environment. Silicon nitride and silicon oxide films deposited at ratios of the reactant flow rates of SiH/N = 1.875 and SiH/NO = 3, respectively, were Si-rich, while Si excess for the oxynitride film (SiH/N/NO = 3:2:2) was not found.

Nanostructured TiAlCuN and TiAlCuCN coatings for spacecraft: effects of reactive magnetron deposition regimes and compositions.

Spacecraft are exposed to a number of factors in the outer space: irradiation by electron flows, high-energy ions, solar electromagnetic radiation, plasma irradiation, and a stream of meteorite particles. All these factors initiate various physical and chemical processes in spacecraft materials, which can eventually lead to failure. To ensure reliable operation of spacecraft, it is necessary to use protective coatings and special radiation-resistant materials.

Influence of Annealing on the Dielectric Properties of Zn-SiO/Si Nanocomposites Obtained in "Hot" Implantation Conditions.

This paper presents the results of AC electrical measurements of Zn-SiO/Si nanocomposites obtained by ion implantation. Implantation of Zn ions was carried out into thermally oxidized p-type silicon substrates with energy of 150 keV and fluence of 7.5 × 10 ion·cm at a temperature of 773 K, and is thus called implantation in "hot" conditions.

Measurements of Microstructural, Chemical, Optical, and Electrical Properties of Silicon-Oxygen-Nitrogen Films Prepared by Plasma-Enhanced Atomic Layer Deposition.

In this study, silicon nitride (SiN) thin films with different oxygen concentration (i.e., SiON film) were precisely deposited by plasma enhanced atomic layer deposition on Si (100) substrates.

Effect of thermal annealing in vacuum and in air on nanograin sizes in hard and superhard coatings Zr-Ti-Si-N.

Zr-Ti-Si-N coating had high thermal stability of phase composition and remained structure state under thermal annealing temperatures reached 1180 degrees C in vacuum and 830 degrees C in air. Effect of isochronous annealing on phase composition, structure, and stress state of Zr-Ti-Si-N-ion-plasma deposited coatings (nanocomposite coatings) was reported. Below 1000 degrees C annealing temperature in vacuum, changing of phase composition is determined by appearing of siliconitride crystallites (beta-Si3N4) with hexagonal crystalline lattice and by formation of ZrO2 oxide crystallites.

[Dynamics of regeneration of epitheliocytes from gastric mucosa at different modes of antirelapse treatment of ulcer disease].

Exacerbation of duodenal ulcer disease (DUD) is associated with elevated number of Ki-67 and Bcl-2 positive endtotheliocytes and apoptotic activity. Inhibition of endotheliocyte proliferation and apoptotic activity in gastric mucosa (GM) upon eradication of Hp in DUD patients promotes ulcer healing. Combination of eradication with melaxen therapy substantially enhances efficiency of Hp elimination and reduces cicatrization time.

[Specifics of apoptotic activity and expression of regulatory molecules (Ki-67, Bcl-2) of gastric mucosal epitheliocytes, in the process of Correa's cascade].

The subjects of the study were 104 patients with Helicobacter pylori (HP)-associated gastric pathology, including 30 patients with gastric ulcer (GU), 30 patients with chronic atrophic gastritis (CAG), 20 patients with CAG plus adenomatous polyps (AP), and 24 patients with gastric cancer (GC). All the subjects were examined dynamically; the comparison group consisted of 12 practically healthy people. The study revealed that GU, CAG, AP, and GC were consequent stages of gastric mucosal epithelial cell regeneration disorder which manifested by the fact that the apoptotic activity of these cells was lower than their proliferation rate, and this difference grew with time; the reflection of this was the growth of Ki-67 and Bcl-2 expression.

[Approximately hourly biological rhythms: theoretical aspects and the prospects of clinical application].

The aim of the review is to attract attention to the importance of a dynamic approach to symptoms of health and pathology. In this regard, long-known approximately 24-hour or circadian rhythms (CR) are very prospective. However, according to recent studies, shorter approximately hourly rhythms (AHR) are of not less importance.

[Irritated bowel syndrome: clinicomorphological aspects of treatment with melaxen].

The purpose of the study was to evaluate the clinical effectiveness of melatonin (melaxen, Unipharm, USA), and its influence on the ultrastructural and histological features on the colon mucosa (CM) in patients with irritable bowel syndrome (IBS) corresponding to Rome criteria II. Twenty-one patients with IBS were examined before and after the end of the therapy (one month upon the beginning of treatment). All the patients had non-specific morphological changes in the CM, which were more pronounced during exacerbation and less significant during remission.

[Melatonin: ulcer disease and seasons of the year].

Melatonin produces a great variety of effects in human organism and plays an essential role in normal function of the body. This explains growing interest of medical researchers to this substance. The paper provides the results of 3-year studies of seasonal rhythm of melatonin production in patients with duodenal ulcer.

[Pancreatic hormone amylin and integrity of the gastric mucosa].

The paper presents experimental findings of some possible mechanisms of protective antiulcerous action of amyline. Amyline is the second beta-cell pancreatic hormone, which has been just recently discovered. The authors have studied the effects of amyline on gastric secretion, mast cell functions, mesenteric lymphatic microvascular contractility, i.

[Circadian rhythms of hemodynamic load on the cardiovascular system in patients with essential hypertension: implication for drug therapy rationale].

Circadian rhythm of hemodynamic load by double product (heart rate x systolic blood pressure) was studied in 224 patients with essential hypertension (EH) treated with different antihypertensive drugs for 8-12 weeks and in 23 healthy subjects. The main feature of the rhythm was a marked morning rise in all the patients including non-dippers and night-peakers without nocturnal blood pressure fall. The examined drugs showed different effects on mean 24-h and morning values of the double product.

Melatonin production in patients with duodenal ulcer.

Unlabelled: OBJECTIVES. This work was designed to study melatonin (M) production levels in duodenal ulcer (DU) patients in the exacerbation and remission stages and in DU patients with a different course of DU in the exacerbation and remission stages.

Methods: DU patients (15 men aged 20 to 45, mean age 34,2 +/- 1,1 years) were studied.

[Time-dependent effects of antihypertensive agents and chronocorrecting action of melatonin in patients with arterial hypertension].

The chronopharmacodynamics of angiotension-converting enzyme (ACE) inhibitors, such as ramipril (R), enalapril (E), acetene (A), caposide-50 (C-50) and the effect of the epiphyseal neurohormone melatonin used alone and in combination with cozaar (Co) and cintome (Ci) in the randomized groups including 124 patients with arterial hypertension (AH). The ACE inhibitors were given in the morning, afternoon, and evening. Co and Ci were used in the morning.