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Abstract  

Different Nd-zeolites were prepared from the original NaX and NaY zeolites by ion exchange. The hydrated and thermally activated (at 550 °C) samples obtained were irradiated with -rays of 1.5 and 10.0 Mrad. The unirradiated and irradiated samples were characterized mainly by X-ray diffraction and tested for catalytic activity in cumene cracking. The X-ray diffraction patterns indicated a slight decrease of crystallinity after irradiation. However, the irradiated samples exhibited higher catalytic activities than unirradiated ones. -Irradiated hydrated zeolites were found to possess comparable activities, whereas the irradiated dehydrated samples were more active. Higher irradiation doses resulted in more active dehydrated zeolites than those irradiated with a lower dose. The observed higher activity was attributed to the formation of tricoordinate aluminium atoms in the zeolite structure, leading to increase of the number of acidic sites and consequently to a catalytic activity.

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Abstract

Over the recent years metallic foams have become a popular material due to their unique characteristics like low density coupled with beneficial mechanical properties such as good energy absorption, heat resistance, flame resistance, etc. However, their production processes (foaming) is highly stochastic which results in an inhomogeneous foam structure. Hybrid aluminum foam with closed-cell has been manufactured using direct foaming method coupled with the Taguchi Design of Experiments (DOE). Image analysis has been carried out to determine the average porous area and pore size. The influence of the production parameters (amount of foaming agent added, mixing speed and temperature) on the pore size and the porous area has been analyzed using the statistical Taguchi technique. From the experiments it was seen that the most important control factor for both the pore size and the porous area is the amount of the foaming agent added, followed by temperature and stirring speed. Furthermore, the statistical significance of these manufacturing parameters on the response was also investigated by performing analysis of variance (ANOVA) statistical method.

Open access

Studies on pollution of water and air dust of Benghazi using various analytical methods

I. The analysis of air dust samples from Benghazi for trace elements using neutron activation analysis and flameless atomic absorption

Journal of Radioanalytical and Nuclear Chemistry
Authors: A. El Hossadi, A. Alian, S. Ali, R. Farooq, A. Hamid, and Tahra Majed

Abstract  

Nondestructive neutron activation analysis has been used for the analysis of 17 out of 24 elements in 12 samples of air particulate matter collected from various localities in Benghazi. Both relative and monostandard methods were used. The neutron activation method was supplemented with graphite furnace atomic absorption, so that most toxic elements could be assayed in the same samples. Thus Cd, Cr, Cu, Mn, Ni, Pb, V and Zn could be analysed quantitatively in most of the samples. It has been found that contamination of the atmosphere of Benghazi with dust is largely due to heavy construction work in the city, action of wind on the surface of land around the city and the release of exhaust products from vehicles and airplanes. Particular contamination due to industrial activities was not noticeable. Results on samples from Benghazi were compared with those from Prague, Munich and Sendai.

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Introduction

Non-adherence in patients with hypertension directly exacerbates clinical outcomes. The purpose of the present research is to study the recognition of the relationships between the perceived social support and self-efficacy and the satisfaction of health care agents and the interaction of the patient with therapeutic personnel and access to health care and the behaviors of adherence to treatment in the patients who suffer hypertension.

Materials and methods

This descriptive cross-sectional correlation study recruited 250 patients from a specialized hypertension clinic in Semnan, who completed the following questionnaires: Multidimensional Scale of Perceived Social Support, self-efficacy, adherence to treatment, access to and satisfaction with health care, and the patient’s interaction with treatment personnel.

Results

An overall statistical description of the sample consists of 89 (35.6%) men and 161 (64.4%) women (SD = 10.41, range = 51.98). Regression coefficient of previous variables (three steps) shows that self-efficacy share, consent form civil services, and job could demonstrate with 99% certainty in the changes of treatment conformity in a meaningful way.

Conclusions

High self-efficacy, satisfaction with health care, and a favorable job have a high direct effect on adherence to treatment in patients with hypertension and controlling hypertension. Social support and education do not have a significant impact on adherence to treatment.

Open access
Acta Biologica Hungarica
Authors: Negin Khomarlou, Parviz Aberoomand-Azar, Ardalan Pasdaran Lashgari, Hamid Tebyanian, Ali Hakakian, Reza Ranjbar, and Seyed Abdolmajid Ayatollahi

The objective of this study was to identify the bioactive compounds of essential oil and evaluate the antibacterial activity of the essential oil extracted from Chenopodium album subsp. striatum against multidrug-resistant bacterial strains (MDR) which were isolated from clinical specimens by conventional methods. Furthermore, eight different Gram-negative and Gram-positive multidrug-resistant bacterial strains were used to investigate the antibacterial potential of the essential oil. The antibacterial activity was tested using MIC and MBC microdilution method, well and disc diffusion in different concentration. The hydro-distillation of aerial parts powder yield was 0.466% (v/w). Essential oil showed bactericidal activity against both MDR Gram-negative and Gram-positive bacterial strains. MIC and MBC results were ranged from 0.31 to 2.5 and 0.62 to 5.0 mg/mL. The inhibition zones in well-diffusion method were ranged from 7 ± 0.6 mm to 15 ± 1.0 mm. Disc diffusion method was ranged from 7 ± 0.0 mm to 16 ± 0.6 mm depending on the type of bacteria strain and essential oil concentration. Essential oil of Ch. album had the greatest potential to be considered as an antibacterial agent against MDR bacteria strain. This potential was due to different biological and bioactive compounds like phytol, linalool, α-terpineol and linolenic acid in the plant.

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