Search results for "aln"

Indium surfactant effect on AlN/GaN heterostructures grown by metal-organic vapor-phase epitaxy: Applications to intersubband transitions

2006

We report on a dramatic improvement of the optical and structural properties of AlN/GaN multiple quantum wells (MQWs) grown by metal-organic vapor-phase epitaxy using indium as a surfactant. This improvement is observed using photoluminescence as well as x-ray diffraction. Atomic force microscopy shows different surface morphologies between samples grown with and without In. This is ascribed to a modified relaxation mechanism induced by different surface kinetics. These improved MQWs exhibit intersubband absorption at short wavelength (2 mu m). The absorption linewidth is as low as 65 meV and the absorption coefficient is increased by 85%.

Mid-infrared intersubband absorption in lattice-matched AlInN/GaN multiple-quantum wells

2005

We report the observation of midinfrared intersubband (ISB) absorption in nearly lattice-matched AlInNGaN multiple-quantum-wells. A clear absorption peak is observed around 3 μm involving transitions from the conduction band ground state to the first excited state. In addition to ISB absorption, photoluminescence experiments were carried out on lattice- matched AlInNGaN single quantum wells in order to determine the spontaneous polarization discontinuity between GaN and Al0.82 In0.18 N compounds. The experimental value is in good agreement with theoretical predictions. Our results demonstrate that the AlInNGaN system is very promising to achieve crack-free and low dislocation density struct…

Litorāles mikrobiotopu ietekme uz Pierīgas brūnūdens ezeru makrozoobentosa sabiedrībām

2019

Maģistra darba “Litorāles mikrobiotopu ietekme uz Pierīgas brūnūdens ezeru makrozoobentosa sabiedrībām” izstrāde un materiālu ievākšana notika (no 17.07.17. līdz 25.05.18.) četros Garkalnes novada ezeros – Līņezerā, Piekūnītī, Maku ezerā un Lielajā Jūgezerā. Analizējot iegūtos rezultātus var secināt, ka zoobentosa organismi visvairāk piesaistīti mikrobiotopiem ar ūdensaugiem un dūņainu grunti. Pārējos mikrobiotopos zoobentosa indivīdu un sugu skaits ir ievērojami mazāks apstiprinot izvirzīto hipotēzi. Ezeru paraugos tika konstatēti 14 dažādi makrozoobentosa taksoni. Visbiežāk pārstāvētās kārtas - vaboles un blaktis. Visi pētāmie ezeri pieskaitāmi brūnūdens ezeru tipam, augu sugu, grunts vei…

Kreowanie obrazu homoseksualizmu w tygodniku ,,Gazeta Polska”

2022

Celem artykułu jest pokazanie, jaki obraz homoseksualności oraz osób homoseksualnych funkcjonuje współcześnie w konserwatywnym tygodniku ,,Gazeta Polska”. Analiza oparta jest na artykułach opublikowanych od stycznia do maja 2021 r. Autorka bierze pod uwagę artykuły zarówno o osobach homoseksualnych, jak i ogólnie o mniejszości LGBT+, gdyż dziennikarze ,,Gazety Polskiej” często nie używają rozróżnienia pomiędzy tymi mniejszościami. W artykule opisuje się leksykę, której dziennikarze tygodnika używają wobec osób homoseksualnych, sposób zapisu (np. cudzysłów), kontekst, w jakim pojawia się temat mniejszości seksualnych oraz strategie perswazji, których używa się, by kreować negatywny obraz hom…

Predictors of therapy failure in newly diagnosed pulmonary tuberculosis cases in Beira, Mozambique.

2018

Abstract Objective Tuberculosis (TB) remains a major global health issue, ranking in the top ten causes of death worldwide. A deep understanding of factors influencing poor treatment outcomes may allow the development of additional treatment strategies, focused on the most vulnerable groups. Aims of the study were: (i) to evaluate the treatment outcome among TB subjects followed in an outpatient setting and (ii) to analyze factors associated with treatment failure in newly diagnosed patients with pulmonary TB in Beira, the second largest city of Mozambique. Results A total of 301 TB adult patients (32.6% females) were enrolled. Among them, 62 (20.6%) experienced a treatment failure over a 6…

Identification of two new mutations in TRPS 1 gene leading to the tricho-rhino-phalangeal syndrome type I and III.

2009

Geobotanical approach to detect land-use change of a Mediterranean landscape: a case study in Central-Western Sicily

2018

A landscape is a palimpsest of the interactions between human activities and ecological dynamics. In an interdisciplinary perspective of dialogue between the ‘Two Cultures’ (Natural Sciences and Humanities), a study of a rural area has been carried out through a reading of plant ecosystems as signs of human impact. The purpose of this paper—as part of the project ‘Harvesting Memories’: Ecology and landscape archaeology of Castro/Giardinallo Valley and Mt. Barrau district (Corleone, Palermo, Sicily)—is to analyse the formative-processes of a Sicilian rural landscape and its changes in the last century. A key element in the reconstruction of the formation of the present landscape is the serie…

Nutritional screening of patients at a memory clinic--association between patients' and their relatives' self-reports.

2015

Aims and objectives To compare individual reports by patients and relatives (proxy) of the Nutritional Form For the Elderly and relate the Nutritional Form For the Elderly scores to Mini Mental Status Examination scores, weight loss, Body Mass Index, five-point Clock Drawing Test and background variables. Background Undernutrition or risk of undernutrition is a significant problem among people with dementia. A poor nutritional state increases the risk of infections, delayed convalescence after acute illness and reduced quality of life. Design A cross-sectional study. Method Application of the Nutritional Form For the Elderly in addition to clinical nutrition parameters and cognitive tests i…

IOC consensus statement on relative energy deficiency in sport (RED-S): 2018 update

2018

In 2014, the IOC published a consensus statement entitled ‘Beyond the Female Athlete Triad: Relative Energy Deficiency in Sport (RED-S)’. The syndrome of RED-S refers to ‘impaired physiological functioning caused by relative energy deficiency and includes, but is not limited to, impairments of metabolic rate, menstrual function, bone health, immunity, protein synthesis and cardiovascular health’. The aetiological factor of this syndrome is low energy availability (LEA).1 The publication of the RED-S consensus statement stimulated activity in the field of Female Athlete Triad science, including some initial controversy2 3 followed by numerous scientific publications addressing: 1. The health…

Food pickiness in the elderly: Relationship with dependency and malnutrition

2014

Special Issue: 5th European Conference on Sensory and Consumer Research (Eurosense) 2012 "A sense of inspiration"; International audience; Among factors contributing to malnutrition in the elderly, the present study aimed at assessing the impact of food selectivity (also referred as food "pickiness") on the nutritional status of the elderly. A survey with 559 French people over 65 years old was conducted to collect data on food selectivity, dependency and nutritional status. Food selectivity was assessed by asking respondents to tick each food they dislike among a list of familiar foods. Since some foods could be ticked as disliked because elderly people experience physical difficulties in …