Mansour Awiedat Salem | University of Sebha (original) (raw)

Papers by Mansour Awiedat Salem

Cleaner engineering and technology, Jun 1, 2023

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)

The idea and research results of a novel proposal of a voltage source converter control are prese... more The idea and research results of a novel proposal of a voltage source converter control are presented. The basic idea of control and novel resulting in topology are discussed. A particular example of a converter is presented below. The converter consists of a mains inverter supplying the load and a filtering auxiliary inverter. The output voltage space vector of the complex converter is composed of two orthogonal voltage space vectors. As a result the converter is able to generate 18 active output voltage vectors which are almost equal in length. Other properties of the topology based on orthogonal vectors' control are discussed in the paper.

IEEE Transactions on Industrial Electronics, 2002

Heliyon, 2020

The present study aim to assess the effect of phosphate and urea fertilizers on the physicochemic... more The present study aim to assess the effect of phosphate and urea fertilizers on the physicochemical properties, pH and electrical conductivity (EC) of the soil. The effect of these fertilizers on cation exchange capacity (CEC), organic matter (OM), and the possibility of contamination with heavy metals (HM) (Cr, Cu, Cd, Mn, Zn, Ni, Fe, and Pb) were studied on the soils of Alshati agricultural project at different seasons after forty years of fertilization. Uncultivated soil samples were also analyzed for comparison and considered as reference. Mean values of soil pH, EC, CEC, and OM ranged between 6.88-7.32, 0.14-0.26 μS/cm, 2.95-4.19 Cmol/kg and 0.49-0.53%, respectively, in all seasons. Concentrations of HMs were 9.50-38.38, 0.0-2.05, 0.0-0.47, 0.0-29.81, 0.0-13.85, 2.83-25.95 and 104-512.20 mg/kg respectively, for Cr, Cu, Cd, Mn, Zn, Ni and Fe. The concentrations of the HMs in the soil were found to be vary significantly with the seasons (winter, spring, summer, and autumn). However, no traces of Pb was found in the soil samples. The result showed a significant correlation between, pH, EC, CEC, OM and HM content of the soil. The geochemical index of contamination shows that there was no contamination with Cu, Cd, Zn, Pb, Cr, Mn, Ni, and Fe.

Forty-six samples of urban topsoil were collected from Tripoli at a depth of 0–15 cm to determine... more Forty-six samples of urban topsoil were collected from Tripoli at a depth of 0–15 cm to determine the concentration of nine heavy metals, including Cd, Pb, Zn, Cu, Ni, Co, Fe, Mn, and Cr. The study aimed to quantify and identify their likely sources of environmental contamination indices and assess their ecological risk to humans. The mean concentrations of these metals were 3.943, 38.317, 170.941, 29.669, 19.699, 30.371, 27444.515, 235.812, and 195.92 mg.kg-1, respectively. These values are higher than the virgin soil background values and permissible limits set forth by WHO. The pollution index (PI) varied from 1.152 for Ni and 2.518 for Cr. The geoaccumulation index (Igeo) averaged 0.824 for Mn and 1.679 for Cr, the contamination factor (CF) averaged 1.28 for Mn and 2.686 for Cr, and the enrichment factor (EF) averaged 0.968 for Mn and 1.893 for Cr, respectively. Pollution indicators such as the Pollution Load Index (PLI), Contamination Degree (Cdeg), and Potential Ecological Ris...

Environment, Development and Sustainability, 2021

The present study was conducted to estimate the CO2 emission factor for the entire energy industr... more The present study was conducted to estimate the CO2 emission factor for the entire energy industry sector in Libya using life-cycle assessment methodology. The CO2 emissions were tracked along with the extraction, distillation and conversion of the energy flow chain. The present results are based on real monitored data collected during the energy flow process from the oil fields to the refinery and lastly to the power plant. Its shown that to generate 1MWh electricity, 291 kg of Diesel fuel has to be burn, which in turn, 1141 kg of crude oil should be refined. The CO2 flow chart has been drawn for this process, it found that the total CO2 emissions are about 983 kg CO2/MWh, the share of oil industry sector which comes extraction and refinery are 0.97 and 5.43% respectively and the rest is from the electricity generation. The obtained results showed wide differences between CO2 emission factors that were tabulated in inventories approved by many environmental agencies for all categories. Furthermore, the followed approach in this research has increased the CO2 emission factors by 6.7% compared to the traditional approach and will give opportunities for fair competition for other electricity generation alternatives (such as renewable energy resources). This approach gives engineering and economic new dimensions to deal with the environmental issues, so that, the concept of optimization of engineering design can be applied from an environmental perspective. Accurate energetic and environmental data were presented activate the climate change policies and mitigation strategies, which can help politicians and decision-makers to draw their environmental policies more effectively.

IOSR Journal of Agriculture and Veterinary Science, 2013

The aim of the study was to investigate and evaluate the occurrence of salinity in two soil profi... more The aim of the study was to investigate and evaluate the occurrence of salinity in two soil profiles in irrigated soils of a 30 years long Brack-Ashkada agriculture project and classify their degree of salinity. The study was carried on in well No. 6 which covers twelve farms. Soil pH, Electrical Conductivity (EC) and Exchangeable Sodium Percent (ESP) were measured at 25C; pH of soil samples ranged between 7.01-8.00; Electrical Conductivity (EC) is between 0.513-3.540 ds.m-1 ; and the Exchangeable Sodium Percent were ranged between 0.72-12.84. The pH of the soils that had been influenced by salinity farms 8 and 9 is 7.49-8.05, EC 1.076-4.421. ESP is 4.03-17.56 for the second and first soil depths respectively. According to the American classification of soil salinity, five sites which represent 8.3% of the studied sites were found either salted or effected by salt.

IOSR Journal of Environmental Science, Toxicology and Food Technology, 2013

The quality of groundwater of fifty one wells for drinking water from Alshati district was assess... more The quality of groundwater of fifty one wells for drinking water from Alshati district was assessed for its suitability for drinking. Water samples were collected and analyzed for various physico-chemical parameters such as pH, Temperature (°C), Electrical Conductivity (EC), Total Hardness (TH), Total Dissolved Solids (TDS), Alkalinity (Alk), Chloride (Cl-), Iron (Fe ++), Manganese (Mn ++), Calcium (Ca ++), Magnesium (Mg ++), Nitrate (NO 3-), Sodium (Na +), Potassium (K +), Sulphate (SO 4-) and Phosphate (PO 4-). The results revealed that some parameters of water samples were out of limit according to the WHO standards and Libyan standards for drinking water. The results shows rising of Fe ++ and Mn ++ in most of the wells studied, rising of Ca ++ in water samples of wells of Al-Mansura and Abu-gadgud, rising of SO 4-, TDS and EC in water samples of wells of Idri, and rising of Clin water samples of Idri, Waanzarik, Taamasan, Al-Mansura and Al-kadra. NO 3 was also rising in water samples of wells of Mahruga and Bergen.

Phytochemistry, 1995

... Liebl.; FUMARIACEAE: Corydalis lutea (L.) DC; Fumaria oicinalis L.; GERANIACEAE: Geranium rob... more ... Liebl.; FUMARIACEAE: Corydalis lutea (L.) DC; Fumaria oicinalis L.; GERANIACEAE: Geranium robertianum L.; G. sanguineum L.; GENTIANACEAE: Centaurium erythraea Rafn.; HIPPOCASTANACEAE: Aesculus ... 9. Stermitz, FR, Norris, FA and Williams, MC (1969) J. Am Chem ...

Nature, 2004

a DNA fragment containing the entire open reading frame (ORF) of mouse PTK7 was used as a probe. ... more a DNA fragment containing the entire open reading frame (ORF) of mouse PTK7 was used as a probe. Histology, immunostaining and scanning electron microscopy Histology and X-Gal staining was performed as described 7. For immunostaining of the sensory hair cells, cochleae were dissected out of the temporal bones and the anlage of Reissner's membrane removed to expose the organ of Corti. Cochleae were then stained, flat-mounted and imaged as described 16. Rabbit anti-PTK7 antibodies were raised against a PTK7 ecto-domain-Fc fusion protein (Zymed). Rhodamine-conjugated phalloidin was from Molecular Probes. Other antibodies were: anti-acetylated tubulin and anti-Ecadherin (Sigma); anti-PAX7, anti-LIM1/2, anti-PAX6, anti-Islet-1, anti-Nkx2.2 and anti-HNF3b (Developmental Studies Hybridoma Bank); anti-Math1 (gift from J. Johnson), anti-LH2 (gift from T. Jessell) and Cy3-and Cy2-conjugated secondary antibodies (Jackson Immuno Laboratories). Images were collected using a Bio-Rad MRC 1024 laser scanning confocal microscope and Laser Sharp image collection software. Orientation of individual bundle was determined by the vertex relative to the neural-abneural axis. 08 was defined as perpendicular to the row of pillar cells. Quantification of bundle orientation in phalloidinstained E18.5 cochleae was performed essentially as described 16. 315 control and 951 mutant hair cells sampled from the basal and middle turns of the cochleae of six embryos, respectively, were scored. Bundle orientation in the apical turns was not quantified due to an extra row of OHCs in the mutant. Scanning electron microscopy images of embryos and cochleae were taken at 20 kV on a Philips 525 scanning electron microscope upgraded with Semicaps digital image aquisition. Samples were prepared using standard protocols. Xenopus assays RNA synthesis, in situ hybridization, culturing and injections were performed as described 23. Xptk7 coding sequences were cloned by RT-PCR from mixed-staged Xenopus total RNA. Xptk7 morpholino oligonucleotides complementary to sequences surrounding the translational start site and control morpholino oligonucleotides were synthesized by Gene Tools (LLC): (1) 5 0-CGCAGAGAGCACAATCGGCCCCAT-3 0 ; (2) 5 0-TGCATCGC GGCCTCTCCCCTCAC-3 0 ; (3) 5 0-TTCCTGCCCCGGATCCTCTCAGTGC-3 0 ; and control morpholino oligonucleotide, 5 0-CGgAGAcAGCAgAATCGcCCCgAT-3 0 (mismatched bases in lower case). Each Xptk7 morpholino oligonucleotide alone caused NTD, with a higher potency when injected in combination. Neural tube closure of devitellinated embryos was scored at stage 19-20. Embryos with completely closed neural tubes were scored as normal; those otherwise were scored as NTD. Embryos with severe gastrulation defects were not scored. Time-lapse microscopy analysis was carried out as described 18 .

Biochemical Journal, 1999

A novel enzyme that catalyses the oxygen-dependent oxidation of 3-nitropropionic acid (3NPA) to m... more A novel enzyme that catalyses the oxygen-dependent oxidation of 3-nitropropionic acid (3NPA) to malonate semialdehyde, nitrate, nitrite and H # O # has been purified from leaf extracts of the horseshoe vetch, Hippocrepis comosa, and named 3NPA oxidase. The enzyme is a flavoprotein with a subunit molecular mass of 36 kDa containing 1 molecule of FMN and exhibits little specificity for all nitroalkanes tested other than 3NPA (apparent K m 620 µM). The maximum enzyme activity in itro was expressed

Arabian Journal of Geosciences