Search results for " Thermal"
showing 10 items of 492 documents
Indoor Comfort in School Buildings: The Case Study of Palermo
2014
Buildings primary energy consumption in developed countries accounts for about 40% of whole uses. Therefore, the European Union has released many regulations, concerning energy saving issues; particularly, it has enacted Directive 2002/91/EC regarding the energy performance of buildings, and its Recast Directive 2010/31/EU, that promotes the Nearly Zero Energy Building targets, introducing more strict parameters in this aim. Furthermore, the latter Directive asks Member States to include within their national plans measures aimed at supporting public authorities to become early adopters of building energy efficiency improvements. In the same time, Public Authorities should implement effecti…
Experiment of Indoor Thermal Optimization of an Old Historic Building of Cluny through Digital Mock-up Simulation
2013
International audience; Improving energy efficiency is the first and most important step toward achieving sustainability in buildings. Buildings designed with sustainable solutions are usually energy-efficient because sustainable design is aimed at producing green buildings. In the case of historic buildings, however, this is quite challenging. Integrated building energy simulation programs have been used in various ways by building professionals to respond to these challenges and to improve building design with respect to sustainability. This poster presents a new approach toward optimizing thermal indoor energy using a digital mock-up simulation of a historical building to explore its pot…
K2AuPS4, TI2AuPS4, K2AuAsS4, and KAu5P2S8: Syntheses, structures, and properties of quaternary gold thiophosphate and thioarsenate compounds
1998
The novel compounds K2AuPS4 (1), Tl2AuPS4 (2), K2AuAsS4 (3), and KAu5P2S8 (4) have been synthesized by direct reaction of the elements with a molten alkaline polythiophosphate(arsenate) flux at 550°C. The crystal structures of these compounds have been determined by single-crystal X-ray diffraction techniques. 1, 2, and 3 crystallize in the monoclinic space group P21/m. The structures of 1, 2, and 3 consist of infinite, one-dimensional anionic chains running along the crystallographic b axis. The chains are separated by potassium or thallium ions. Neighbouring Au atoms are bridged by MS43− tetrahedra (M = P, As) in a trans orientation. Compound 4 crystallizes in the space group P21/c. The a…
Ionic liquid crystals based on 3-perfluoalkyl-1,2,4-triazol-4-ium salts
2016
Liquid-crystalline ionic liquids (LC-ILs) are a class of organic materials that of great current interest: they are defined as organic salts that possess the properties of two interesting kinds of material – ionic liquids (ILs) and liquid crystals (LCs). LC-ILs combine many interesting features of ILs (e.g. low volatility and the ability to dissolve solutes with a range of polarities) as well as many attractive properties of LCs (e.g. their intrinsic order and anisotropy). This provides unique opportunities that can be exploited in many different fields, for example their use as solvents for extraction processes as well as electrolytes for batteries, fuel cells, and dye-sensitised solar cel…
Interactions of the alternating double stranded copolymer poly(dA-dT).poly(dA-dT) with NiCl2 and CdCl2: solution behaviour
2007
The thermal denaturation of the synthetic high molecular weight double stranded polynucleotide poly(dA-dT) x poly(dA-dT) has been studied in aqueous buffered solution (Tris 1.0 mM; pH 7.8+/-0.2) in the presence of increasing concentrations of either Ni(2+) (borderline cation) or Cd(2+) (soft cation) at four different constant ionic strength values (NaCl), making use of UV and circular dichroism (CD) spectroscopies. The experimental results show that the B-type double helix of the polymer is stabilized against thermal denaturation in the presence of both cations at low concentrations, relative to the systems where only NaCl is present, in the same conditions of ionic strength and pH. The eff…
Effects of Saline and Deficit Irrigation on Soil-Plant Water Status and Potato Crop Yield under the Semiarid Climate of Tunisia
2019
Water supplies have been decreasing in several semi-arid regions, and it is therefore necessary to adopt irrigation strategies aimed at maximizing water use efficiency. In this paper, the effects of saline and deficit irrigation on water use efficiency and on potato crop response, based on observations of soil and plant water status, were investigated. Experiments were carried out in Central Tunisia, by monitoring potato crop growth during two seasons in four distinct treatments (T1&ndash
A geostatistical approach to map near-surface soil moisture through hyperspatial resolution thermal inertia.
2021
Thermal inertia has been applied to map soil water content exploiting remote sensing data in the short and long wave regions of the electromagnetic spectrum. Over the last years, optical and thermal cameras were sufficiently miniaturized to be loaded onboard of unmanned aerial systems (UASs), which provide unprecedented potentials to derive hyperspatial resolution thermal inertia for soil water content mapping. In this study, we apply a simplification of thermal inertia, the apparent thermal inertia (ATI), over pixels where underlying thermal inertia hypotheses are fulfilled (unshaded bare soil). Then, a kriging algorithm is used to spatialize the ATI to get a soil water content map. The pr…
Radio-frequency thermal ablation (RFTA) of small hepatocellular carcinoma in patients with cirrhosis. Experience at a single tertiary referral center
2005
AIM: Radio-frequency thermal ablation (RFTA) may prolong the survival of patients with small hepatocellular carcinoma (HCC) associated with cirrhosis. The aim of this study was to evaluate efficacy and safety of RFTA. METHODS: We performed the Kaplan-Meier analysis to estimate the survival rate in 69 consecutive patients with HCC (mean age 66+/-6.5 years; 44/25 male/female; 56 Child-Pugh class A and 13 Child-Pugh class B) treated by RFTA. A single lesion was observed in 60/69 (87%), two lesions in 8/69 (11.6 %), and 3 lesions in 1/69 (1.4 %) of patients. The tumor size was = or <3 cm in 60/69 (87%). RESULTS: Twenty-two patients died during follow-up. Overall survival rates were 81%, 66%, an…
Treatment of hepatocellular carcinoma in compensated cirrhosis with radio-frequency thermal ablation (RFTA): a prospective study
2005
Abstract BACKGROUND/AIMS: To assess the effectiveness and the safety of radio-frequency thermal ablation (RFTA) in patients with hepatocellular carcinoma (HCC) or = 35 g/L, platelet count > or = 100.000/mmc, tumor size < or = 3 cm, complete response at 1 month and Barcelona Clinic Liver Cancer (BCLC) staging classification. Overall recurrence rates were 22, 38, and 44% at 12, 24, and 30 months, respectively. One procedure-related death occurred. The proportion of major complications after treatment was 3.9%. CONCLUSIONS: A complete response after RFTA significantly increases survival. The longest survival is obtained in the presence of HCC < or = 3 cm and of higher baseline albumin levels a…
The effect of high-In content capping layers on low-density bimodal-sized InAs quantum dots
2013
[EN] The structural and morphological features of bimodal-sized InAs/(In) GaAs quantum dots with density in the low 10(9) cm(-2) range were analyzed with transmission electron microscopy and atomic force microscopy and were related to their optical properties, investigated with photoluminescence and time-resolved photoluminescence. We show that only the family of small quantum dots (QDs) is able to emit narrow photoluminescence peaks characteristic of single-QD spectra; while the behavior of large QDs is attributed to large strain fields that may induce defects affecting their optical properties, decreasing the optical intensity and broadening the homogeneous linewidth. Then, by using a rat…