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  • Author: M.H.M. Hassan x
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Open access

J. Hassan, M. Mahdi, S. Kasim, Naser Ahmed, H. Hassan and Z. Hassan

Abstract

ZnO nanorod arrays were grown on a flexible Kapton tape using microwave-assisted chemical bath deposition. High crystalline properties of the produced nanorods were proven by X-ray diffraction patterns and field emission scanning electron microscopy. Additionally, the photoluminescence spectrum showed higher UV peaks compared with visible peaks, which indicates that the ZnO nanorods had high quality and low number of defects. The metal-semiconductor-metal (MSM) configuration was used to fabricate UV and hydrogen gas detectors based on the ZnO nanorods grown on a flexible Kapton tape. Upon exposure to 395 nm UV light, the UV device exhibited fast response and decay times of 37 ms and 44 ms, respectively, at a bias voltage of 30 V. The relative sensitivities of the gas sensor made of the ZnO nanorod arrays, at hydrogen concentration of 2 %, at room temperature, 150 °C and 200 °C, are 0.42, 1.4 and 1.75 respectively.

Open access

I. Valaei, S.R. Hassan-Beygi, M.H. Kianmehr and J. Massah

Abstract

The world’s dependence on chemical fertilizer as the primary source for enriching agricultural fields is continually increasing that cause nature pollution. This has led researchers to aggressively investigate renewable fertilizer resources, biomass, to produce organic crops and reduced wastage. Poultry litter is a bulk solid and biomass feed stocks. Flow behavior of bulk solid is a critical factor in designing and developing suitable equipments (e.g. pelletizing machine). The bulk density, tap density, Carr’s index and powder avalanche time technique were applied to evaluate the flow properties of poultry litter. The experiments were carried out at moisture content (10, 20 and 30% w.b.), particle size (0.3, 0.6 and 1.18 mm) for the bulk and tap densities as well as Carr’s index. In addition to the moisture content (10, 20 and 30 %w.b.) and particle size (0.3, 0.6 and 1.18 mm) the rotational speed of drum (0.5, 1 and1.5 rpm) were also investigated for the avalanche time. The results showed that with increasing moisture content Carr’s index increased significantly (P<0.01) in the ranges of 16.2% to 18.5% and with increasing particle size the Carr’s index decreased from 20.35% to 14.78%. The litter powder avalanche time (AT) increased significantly (P<0.01) with increasing moisture content and decreasing rotational speed and particle size. The bulk and tap densities of the litter powder was decreased with increasing moisture content and increasing the particle size. The bulk and tap densities of the driest and finest poultry litter sample were higher than other ones.

Open access

M. K. Ammar, M. R. Amin and M.H.M. Hassan

Abstract

This paper presents an analytical method to determine the rise-set times of satellite-satellite visibility periods in different orbits. The Visibility function in terms of the orbital elements of the two satellites versus the time were derived explicitly up to e 4. The line-of-sight corrected for Earth Oblateness up to J 2, were considered as a perturbation to the orbital elements. The visibility intervals of the satellites were calculated for some numerical examples in order to test the results of the analytical work.

Open access

M. K. Ammar, M. R. Amin and M.H.M. Hassan

Abstract

In a previous (herein referred to as Ammar, Amin and Hassan Paper [1]) the statement of the problem was formulated and the basic visibility function between two satellites in terms of the orbital elements and time were derived. In this paper the perturbing effect due to drag force on the visibility function were derived explicitly up to O(e 4), by using Taylor’s expansion for the visibility function about certain epoch. We determine the rise and set times of the satellites through the sign of the visibility function. Numerical examples were worked out for some satellites in order to check the validity of the work.

Open access

Nayera E. Hassan, Sahar A. El-Masry, Salwa M. Elshebini, Muhamed Al-Tohamy, Nihad H. Ahmed, Enas Abdel Rasheed, Gamila S.M. El-Saeed, Nagwa M. Hassan, Emad N. Zikri and Mohamed S. El Hussieny

Abstract

AIM: The aim of this study was to compare efficiency of three types of obesity management protocols: dietary measures and physical activity; acupuncture or laser acupuncture with healthy diet among obese females.

SUBJECTS AND METHODS: Randomized longitudinal prospective study, carried out on 76 adult females. Blood pressure, anthropometric, ultrasonographic and biochemical assessments were done.

RESULTS: Females undergo nutritional intervention showed highly significant improvement in the anthropometric measurements, visceral fat at umbilicus by US and diastolic blood pressure (decreased), and insignificant differences in fasting blood sugar and lipid profile. Female undergo acupuncture intervention showed highly significant improvement in visceral fat by US, lipid profile (decreased triglycerides, total cholesterol and LDL, and increased HDL), and decreased fasting blood sugar, and insignificant differences in the anthropometric measurements. Those undergo laser intervention showed highly significant improvement in all anthropometric measurements under study, visceral fat at umbilicus by US, blood pressure and some parameters of lipid profile (decreased total cholesterol and LDL).

CONCLUSIONS: Nutritional intervention alone could be used to reduce weight if the lipid profile within normal range, but if it is impaired, acupuncture should be used beside. To strength the reduction in body anthropometry, laser intervention was recommended beside the nutritional intervention.

Open access

Ali K. Alzahrani, Mostafa M. Farag, Said H. Abbadi, Mohamed M. Hassan, Ahmed Gaber and Ahmed S. Abdel-Moneim

Abstract

Background

The emergence of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli and Klebsiella pneumoniae constitutes a serious problem because of the transfer of resistance genes from one organism to another.

Objectives

To screen the antibiotic susceptibility of E. coli and K. pneumoniae from inpatients at King Abdul- Aziz Hospital, Al-Taif, Saudi Arabia and to detect common ESBL genes, and random amplified polymorphic DNA (RAPD) polymerase chain reaction (PCR) genotyping of the Enterobacteriaceae.

Methods

We analyzed 43 bacterial strains isolated from clinical samples of sporadic cases for their reactivity to different antibiotics. Strains that showed resistance by monoplex PCR were screened for ESBL TEM- and CTXM-1-, -2-, and -9-encoding genes. Random amplifications were used for typing the resistant strains.

Results

The majority of the ESBL containing strains were sensitive to meropenem, amikacin, gentamicin, and tigecycline. PCR detection using ESBL gene-specific primers showed that 17 of 43 strains harbored genes for ESBL TEM, CTX-M-1, or CTX-M-2. RAPD typing revealed marked variation among the ESBL-producing E.coli in relation to each other.

Conclusions

Considerably high incidence of ESBL-producing bacteria was present patients from the local area of Al-Taif and nearby cities in Saudi Arabia with TEM and CTX-M subtypes being the most commonly detected variants. There was evidence of a polymorphic genetic pattern among ESBL-producing bacteria.

Open access

Nayera E. Hassan, Sahar A. El-Masry, Rokia El-Banna, Salwa M. Elshebini, Muhamed Al-Tohamy, Salwa El-Batrawy, Nihad H. Ahmed, Dalia Adel, Enas Abdel Rasheed, Mohamed Selim, Mohamed S. El Hussieny, Aya Khalil and Manal Mouhamed Ali

Abstract

AIM: To evaluate body composition changes after use of three different types of obesity management protocols: dietary measures and physical activity; acupuncture or laser acupuncture with healthy diet; aiming at achieving stable weight loss among obese Egyptian females.

METHODS: A randomized longitudinal prospective study included 76 obese adult females; aged 26 up to 55 years. Anthropometric, body composition, ultrasonographic and biochemical assessments were done.

RESULTS: The three types of obesity management protocols showed significant improvement in body composition (decrease in fat% and increases in FFM and TBW) and visceral fat by US. However, nutritional intervention showed highly significant improvement in the skin fold thickness at triceps and biceps sites and peripheral adiposity index. Acupuncture intervention showed highly significant improvement in fasting blood glucose (decreased) and lipid profile (decreased triglycerides, total cholesterol and LDL, and increased HDL). Laser intervention showed highly significant improvement in all the skin fold thickness and some parameters of lipid profile (decreased total cholesterol and LDL).

CONCLUSIONS: The three obesity management protocols have significant effect on body composition, but acupuncture has the best effect in improving the lipid profile and fasting blood sugar. In addition, Laser intervention was recommended to improve skin fold thickness and subcutaneous fat.