Najran University

About: Najran University is a education organization based out in Najrān, Saudi Arabia. It is known for research contribution in the topics: Photocatalysis & Nanoparticle. The organization has 751 authors who have published 1809 publications receiving 28233 citations.

Development of an amperometric biosensor for dopamine using novel mesoporous silicon nanoparticles fabricated via a facile stain etching approach

Abstract: Mesoporous silicon (PSi) modified glassy carbon electrode (GCE) was studied for the first time for efficient detection of dopamine (DA). A facile stain etching method was used to synthesize the single crystalline PSi nanoparticles, which was confirmed by the SAED. The morphological study of PSi NPs by FESEM and TEM showed the random distribution of pores with less than 25 nm pore size. The X-ray diffraction (XRD), Raman spectra, and Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) were also used in characterizing the PSi NPs. The-as fabricated PSi NPs modified GCE biosensor can measure a wide range of dopamine (0.5–333.3 μM) in phosphate buffer solution (PBS) with a sensitivity value of 0.2715 μAμM−1cm−2 with an extremely low limit of detection (LOD) of 3.2 nM. This non-enzymatic dopamine biosensor was also tested for the possible impact of common interfering substances, which showed very good selectivity. The current modified electrode was further employed to analyze human blood serums and dopamine hydrochloride injection samples to detect DA, where it showed very acceptable analytical results. Additionally, the current PSi/GCE biosensor showed exceptional reproducibility, repeatability, and long-term stability.

Assessment and Management Flash Flood in Najran Wady Using GIS and Remote Sensing

Abstract: Flash flood assessment and management are necessary for municipal, urban growth planning and emergency action plans By using the Hydrologic Engineering Centers River Analysis System software, we can model flash flood events and calculate water surface profiles over the length of the modeled stream After collecting elevation points by using GPS method, the digital elevation model can be calculated for the study area Najran city has main flood stream passes beside King Abdullah Road based on facts and previous works A small study area including the mainstream of Wady Najran and King Abdullah Road has chosen as test site The used methodology has also been proved efficiently for identifying flood inundation maps Water extent area overlapped by 52–86% for both used methods At discharge Q = 15 m3/s, the road needs to be protected from the flood

Ab initio investigation of 2,2′-bis(4-trifluoromethylphenyl)-5,5′-bithiazole for the design of efficient organic field-effect transistors

Abstract: The initial molecular structure of 2,2′-bis(4-trifluoromethylphenyl)- 5,5′-bithiazole has been optimized in the ground state using density functional theory (DFT). The distribution patterns of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) have also been evaluated. To shed light on the charge transfer properties, we have calculated the reorganization energy of electron λe, the reorganization energy of hole λh, adiabatic electron affinity (EAa), vertical electron affinity (EAv), adiabatic ionization potential (IPa), and vertical ionization potential (IPv) using DFT. Based on the evaluation of hole reorganization energy, λh, and electron reorganization energy, λe, it has been predicted that 2,2′-bis(4-trifluoromethylphenyl)-5,5′-bithiazole would be a better electron transport material. Finally, the effect of electric field on the HOMO, LUMO, and HOMO–LUMO gap were observed to check its suitability for the use as a conducting channel in organic field-effect transistors. © 2015 Wiley Periodicals, Inc.