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Medina, Saudi Arabia

Taibah University is a university located in Medina, Saudi Arabia, established in 2003. Wikipedia.

Benghanem M.,Taibah University
Renewable Energy | Year: 2010

In this paper, the development of wireless data acquisition system (WDAS) for weather station monitoring is described. It is based on the Emitter/Receiver architecture and it does not require the physical connection of the monitored systems to the data collection server. The proposed system consists of a set of sensors for measuring meteorological parameters (solar radiation, temperature, humidity, pressure, wind speed & direction, rain fall, etc.). The collected data are first conditioned using precision electronic circuits and then interfaced to a PC using RS232 connection via wireless unit. The LabVIEW program is used to further process, display and store the collected data in the PC disk. The proposed architecture permits the rapid system development and has the advantage of flexibility and it can be easily extended for controlling the renewable energy systems like photovoltaic system. The measured parameters are available on-line over the internet to any user. © 2009 Elsevier Ltd. All rights reserved. Source

Benghanem M.,Taibah University
Applied Energy | Year: 2011

This article analyzes the optimal choice of the tilt angle for the solar panel in order to collect the maximum solar irradiation. In this paper, the collector surface is assumed to be facing toward equator. The study is based upon the measured values of daily global and diffuse solar radiation on a horizontal surface. It is shown that the optimal angle of tilt (βopt) for each month, allows us to collected the maximum solar energy for Madinah site. Annual optimum tilt angle is found to be approximately equal to latitude of the location. It is found that the loss in the amount of collected energy when using the yearly average fixed angle is around 8% compared with the monthly optimum tilt βopt. © 2010 Elsevier Ltd. Source

Basit S.,Taibah University
British Journal of Biomedical Science | Year: 2013

Vitamin D, a fat-soluble prohormone, is synthesised in response to sunlight. Vitamin D requires two metabolic conversions, 25-hydroxylation in the liver and 1α-hydroxylation in the kidney, to become active hormone. The active form, 1α,25-(OH)2D, binds to the vitamin D receptor (VDR) to modulate gene transcription and regulate mineral ion homeostasis. Vitamin D plays several roles in the body, influencing bone health as well as serum calcium and phosphate levels. Furthermore, vitamin D may modify immune function, cell proliferation, differentiation and apoptosis. Vitamin D deficiency has been associated with numerous health outcomes, including risk of rickets in children or osteomalacia in adults, increased risk of fractures, falls, cancer, autoimmune disease, infectious disease, type 1 and type 2 diabetes, hypertension and heart disease, and other diseases such as multiple sclerosis. Here, vitamin D physiology and metabolism, its genomic action and association of polymorphisms in vitamin D pathway genes with different diseases are reviewed by focusing on new findings published in the literature. Source

The conventional method of synthesizing porous clay heterostructures (PCHs) is based on the use of cetyltrimethylammonium cations, amines (as a co-surfactant) and a silica source. In the present study, we report the preparation of PCH materials from Al13-intercalated montmorillonite and its pillared derivatives using one directing template (dodecylamine) and a silica source. This method allowed us to reduce the use of the organic template and to incorporate the aluminum species directly into the silica framework intercalated between the clay sheets in one step. The dodecylamine template was removed by calcination at 550 C in air. The PCH material prepared from the Al13-intercalated clay exhibited a higher surface area, mesopore volume and acidity, as well as strong Brønsted and Lewis acid sites. However, the use of pillared clays did not lead to the formation of PCH material due to the strong interaction between the alumina species and the clay sheets, which hindered their exchange with dodecylamine, as indicated by XRD and 29Si and 27Al solid-state NMR techniques. The hydro-isomerization reaction of heptane was tested on the differently prepared PCHs with a conversion of 60% and isomer yield of 50% at 350 C. © 2013 Elsevier Inc. All rights reserved. Source

Messali M.,Taibah University
Arabian Journal of Chemistry | Year: 2015

A facile preparation of a series of 17 new functionalized picolinium-based ionic liquids under "green chemistry" conditions is described. For the first time, target ionic liquids were prepared using standard methodology and under microwave irradiation in short duration of time with quantitative yields. Their structures were characterized by FT-IR, 1H NMR, 13C NMR, 11B, 19F, 31P and mass spectra. © 2011. Source

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