Thermal Behavior of Composite Material Based on Phase Change Material/Plaster as Thermal Energy Storage in Multilayer Wall: Experimental Study.

This study aims to explore the effects of augmenting the mass proportion of a composite comprising paraffin and beeswax (PBPCM) within plaster, which influences the thermal insulation of a dual wall. This work is primarily based on the thermal properties of the composite material PBPCM/plaster with varying percentages of PBPCM. Various essential parameters, such as density, thermal conductivity, specific heat capacity, thermal diffusivity, and latent heat, were assessed and juxtaposed with those of conventional plaster for the PBPCM/plaster composite material.

Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy MgNi.

In the present study, we explored the temperature evolution and hydrogen desorption properties of the MgNi alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar.

Activated Carbon as an Adsorbent for CO Capture: Adsorption, Kinetics, and RSM Modeling.

The main objective of this research is to investigate the adsorption isotherms and the optimization of the carbon dioxide (CO) adsorption process on activated carbon (AC). The AC has been characterized by X-ray diffraction, scanning electron microscopy, and nitrogen (N) adsorption-desorption. The CO isotherms measured under three adsorption temperatures (318, 308, and 298 K) were investigated by the Langmuir and linear driving force model.

Experimental and Theoretical Studies of Hydrogen Storage in LaNiAlFe Hydride Bed.

In this article, the experimental measurements of the absorption/desorption P-C-T isotherms of hydrogen in the LaNiFeAl alloy at different temperatures and constant hydrogen pressure have been studied using a numerical model. The mathematics equations of this model contain parameters, such as the two terms, n and n representing the numbers of hydrogen atoms per site; N and N are the receptor sites' densities, and the energetic parameters are P and P. All these parameters are derived by numerically adjusting the experimental data.

Experimental study of the microstructures and hydrogen storage properties of the LaNiMnCo alloys.

In the present study, the absorption and desorption kinetics of hydrogen and the isotherm (P-C-T)) of the LaNiMnCo alloy were measured at values of 283 K, 303 K, and 313 K. The morphological states of this sample were examined using characterization techniques, including X-ray diffraction and scanning electron microscopy. The thermodynamic functions for the absorption-desorption of hydrogen by hydrides, such as enthalpy (H) and entropy (S), were calculated from the experimental data or by using a model that exists in the literature and is premised on the adjustment of isotherm curves at various temperatures.

Conception and Theoretical Study of a New Copolymer Based on MEH-PPV and P3HT: Enhancement of the Optoelectronic Properties for Organic Photovoltaic Cells.

A new copolymer has been studied, which is formed by Poly(2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene-vinylene) (MEH-PPV) and poly(3-hexylthiophene) (P3HT). The choice of these π-conjugated polymers was based on their semiconductor characters and their great applicability in electronic organic devices. The structure and vibrational and optoelectronic properties were simulated by calculations based on DFT, TD-DFT, and ZINDO.

Photophysical Properties of the PVK-MEH-PPV/PCBM Composite for Organic Solar Cells Application: Synthesis, Characterization and Computational Study.

The physical and chemical properties of a new organic composite including PVK-MEH-PPV bi-block copolymer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were recorded. The functionalization and the charge transfer that occurs between donor and acceptor were examined and computed. In fact, the stationary and time-resolved photoluminescence properties were used to examine the effect of the PCBM on the optical properties of the PVK-MEH-PPV matrix.

Complementary Study Based on DFT of Optical and Electronic Properties of New Copolymer PVK-F8T2.

This article is mainly a complementary study of a novel part of π-conjugated copolymers based on the poly (N-vinylcarbazole) (PVK) and poly (9,9-dioctylfluorene-co-bithiophene) (F8T2) unit based on the Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TD-DFT). This study is carried out to explore the structural and optoelectronic characteristics of a new organic material named PVK-F8T2. First, the structural, optical (absorption, photoluminescence, optical transition), electronic (molecular orbital (MO), energy-level diagram) and vibratory parameters of infrared (IR) were computed and compared with experimental studies.

Self-ordering promoted by the nanoconfinement of poly(3-hexylthiophene) and its nanocomposite with single-walled carbon nanotubes.

Nanostructuration and self-ordering of semiconducting organic materials are required to fabricate highly efficient photovoltaic and photoemissive devices. In this work, we investigated the combined effect of melt-assisted template processing and self-ordering of high purity regio-regular poly (3-hexylthiophene) (P3HT) to obtain nanofibers of P3HT and of P3HT-single-walled carbon nanotubes (SWNT) nanocomposites. An original ordering of the polymer and the carbon nanotubes within the nanofibers, as well as their surprising anisotropic photoluminescent properties were determined by vibrational and optical spectroscopy.

Design and Rationale of the National Tunisian Registry of Atrial Fibrillation: Protocol for a Prospective, Multicenter Trial.

Background: Atrial fibrillation (AF) is an important health problem in Tunisia. A significant change in the epidemiological pattern of heart disease has been seen in the last 3 decades; however, no large prospective multicenter trial reflecting national data has been published so far. Robust data on the contemporary epidemiological profile and management of AF patients in Tunisia are limited.

Sample Management: Recommendation for Best Practices and Harmonization from the Global Bioanalysis Consortium Harmonization Team.

The importance of appropriate sample management in regulated bioanalysis is undeniable for clinical and non-clinical study support due to the fact that if the samples are compromised at any stage prior to analysis, the study results may be affected. Health authority regulations do not contain specific guidance on sample management; therefore, as part of the Global Bioanalysis Consortium (GBC), the A5 team was established to discuss sample management requirements and to put forward recommendations. The recommendations from the team concern the entire life span of the sample and include the following: 1.

[Use of catecholamines for shock. A continuous debate!].

Background: Hypotension and shocks are frequently observed in patients requiring admission in ICU. However, the optimal adrenergic support in shock is controversial.

Aim: To perform a descriptive approach of the current use of catecholamine in a medico-surgical ICU in patients with schoks.

Use of heptaminol hydrochloride for catecholamine weaning in septic shock.

We analyze in the current study the impact of heptaminol hydrochloride (Heptamyl) administration in patients with septic shock requiring adrenergic support on the duration of vasopressor infusion and on catecholamine delay weaning. In this prospective study were included 49 nonconsecutive patients with septic shock requiring vasopressor infusion and with stable hemodynamic parameters during more than 24 hours. All these patients were included in a random way to receive or not heptaminol hydrochloride.

[Coronary arteriography in severe aortic valve disease].

Three hundred and twelve patients with severe aortic valve disease underwent a pre-operative haemodynamic study including coronary arteriography either as routine (age more than 50 years) or because of chest pains, previous myocardial infarction or for patients with risk factors of coronary atherosclerosis. Significant coronary artery disease was present in 9% of all cases. Coronary artery disease was more frequent in patients with angina and in patients with previous myocardial infarction but none of these factors was specific.

[Twenty years result of a corrective surgery of tetralogy of Fallot in a 50 years old woman].

The authors report the case of a woman operated at a 50 years of age for a tetralogy of Fallot with a good late result.

[Multiple coronary artery-left ventricular fistulae. A case report].

The authors report the case of a patient with multiple coronary artery-left ventricular fistulae discovered in coronary angiography for exertional angina.

[Pulmonary hypertension in sickle cell anemia. A case report].

We report the case of a 33-years-girl with SCA and severe PH. She developed six month before admission, non productive cough and dyspnea. Physical examination at admission revealed shortness of breath and right heart ventricular failure.

[Percutaneous mitral commissurotomy and left ventricular function in severe mitral stenosis].

The purpose of this study was to determine the immediate effect of percutaneous mitral commissurotomy (PMC) on left ventricular (LV) performance. We studied 30 patients with severe mitral stenosis undergoing successful PMC by cardiac catheterization and angiography before and 5 minutes after PMC. All patients were in sinus rhythm and no patient had hypertension or clinical coronary artery disease.