Results 1 - 10 of 437
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[en] The research work aims to quantify the concentration of nicotine and the toxic elements identified after different toombak fermentation procedures and secondly to evaluate their possible association with oral cancer. High performance liquid chromatography was used to measure nicotine, while inductive coupled plasma- emission spectroscopy was used to measure the concentration of the elements in off-the-shelf toombak samples, which were collected from different regions of Sudan, also raw Toombak samples fermented in the laboratory using different concentration of naturon were detected. The results showed that there is a strong correlation between the concentration of naturon used in the fermentation process and the concentration of nicotine and the toxic elements. Higher naturon concentration decreases the levels of nicotine and cd, Pb, Cr, Ni, Cu, Zn, co nevertheless the levels still exceed the recommended limits. The results can be used to control the toxicity level by standardizing the fermentation method. When the prepared naturon concentration was So ml/gram the total nicotine content was 6 ppm compared with the lowest concentration of prepared naturon 10 ml/gram the total nicotine was 46 ppm, while the total nicotine content was 206 ppm measured for toombak added naturon. The result of the study showed that nicotine content and toxic elements measured in toombak ready to use in Sudanese markets lead to hazard diseases which occurred due to addiction of the habit especially oral cancer, data were collected and analyzed using statistical method. To minimize the rich of this habit to words oral cancer and other advisers effect, it is recommended from this study to use a mixture of naturon and tobacco 3:1 respectively, and this can be regarded as standard ratio for the Sudanese standard metrology. (Author)
[en] Few-view in situ flash x-ray high-speed computed tomography (HSCT) is a computed tomography (CT) technique used to investigate high-speed phenomena on the timescale of microseconds. The successful application to quantitatively analyze and characterize fragments formed during a 1000 m s−1 impact process onto a ceramic plate with a CT reconstruction from only six x-ray projections has been shown. The method delivers spatially resolved 3D information about the fragments at one point in time. This information is not (or only partially) accessible by alternative experimental methods. Therefore, quantifying the accuracy of the measured data is not directly possible. In order to estimate the precision of the method and the influence of different sources limiting accuracy, a simulation study consisting of 250 virtual experiments was carried out. The border conditions of the study are based on the actual experimental data from the six-view experiment. The results show that steel fragments with a diameter of about 8 mm (volume ∼ 300 mm3, weight ∼ 2.5 g) can be reconstructed with an averaged relative volume deviation of about 30%. For larger framents, the error reduces down to 10% relative average deviation. The spatial position of the center of mass can be determined with an averaged uncertainty of about 0.8 to 1.2 mm for most fragment sizes. (paper)
[en] The transition from an operating nuclear facility to the decommissioning phase is critical in the life cycle of every facility. A number of organisational and technical modifications are needed in order for the facility to meet new objectives and requirements, and a certain number of activities must be initiated to support the transition and preparation for the dismantling of the facility. Thorough preparation and planning is key for the success of global decommissioning and dismantling projects, both to minimise delays and undue costs and to ensure a safe and efficient decommissioning process. The aim of this report is to inform regulatory bodies, policy makers and planners about the relevant aspects and activities that should begin during the last years of operation and following the end of operation. Compiling lessons learnt from experiences and good practices in NEA member countries, the report supports the further optimisation of transition strategies, activities and measures that will ensure adequate preparation for decommissioning and dismantling
[en] Turning is a broadly used material removal process to manufacture cylindrical products. The effects of various process parameters on turning like spindle speed, feed rate and depth of cut have been investigated to Impact on Material Removal Rate (MRR) and surface roughness (Ra) by using Response Surface Methodology. Experimental plan is performed by a Box-behenken design. The main purpose of this work is to study the effect of process parameters on Aluminium alloy AA6061-T6 surface, and to develop the mathematical model for Material removal rate and surface roughness on milling process. The quadratic model is best agreement with experimental data; finally the numerical optimization technique has been used to find out best optimum milling parameters. The optimal set of process parameters has also been predicted to maximize the MRR and minimize the surface roughness. (paper)
[en] According to the decree Head of BATAN No. 14 year 2013, one of Center for Radioactive Waste Technology Centre (RWTC) task is to carry out management of the radioactive waste. Receiving of radioactive waste is part of the management of radioactive waste; therefore, it should be in accordance with applicable regulations. This activity should follow current procedure, administratively and technically. Thus, it is necessary to evaluate the activities of receiving radioactive waste in order to control and monitor them so that its management can be safe for workers, waste management installations, community, and environment. This activity was carried out by preparing all documents of the receival of radioactive waste, and then followed by classification and evaluation of the results of receiving procedures as per waste's type. During the period of 2016, RWTC received about 95260.5 liters of liquid radioactive waste, 1975 liters of semi-liquid radioactive waste, 147 drums of 100 liter and 186 pieces HEPA Filters of contaminated solid radioactive waste, and 164 pieces of disused sealed radioactive sources. All waste received during 2016 has fulfilled the requirements of technical and administrative, and stored safely and securely in IS 1, IS 2, and liquid waste storage tank located in Building 50. (author)
[en] The article is devoted to the investigation of the possibility of applying new credit instruments for the implementation of technological innovations in machine building and other branches of the fuel and energy complex. The possibilities of using the new tool as an element of industrial policy in the program of import substitution of high-tech products have been considered. (paper)
[en] In this work we established a diagnostic reference level (DRL) for patient dose focusing on the investigation of activity to the kidneys during(99mTc-DTPA) kidney scan, selected two department nuclear medicine in main hospitals in Khartoum state. The DRLs is an investigational level used to identify unusually high radiation doses for common diagnostic medical in Nuclear Medicine procedures and suggested action levels above which a facility should review its methods and determine if acceptable image quality can be achieved at lower doses. The high specific activity of 99mTc makes it suitable as a first pass agent, for multiple or sequential studies, 99mTc diethylenetriaminepentaacetic acid (DTPA) is preferred to 99mTc-pertechnetate. Patients who had been prepared for the kidney scan 99mTc- DTPA were divided to three groups. The first group received dose less than 5 mCi, are represent (27.03%) from all patients, second group received dose 5 to 5.5 mCi are represent(66.67%) and the third group received dose from 5.6 to 6.2 mCi are represent (6.31%) from all patients 99mTc-DTPA. And according to the IAEA recommendation for adult doses(5-10mCi) this study show that about 93.1% of the sample examines by dose less than 5.5 mCi. The results presented will serve as a baseline data needed for deriving reference doses for renal examinations for nuclear medicine departments in Sudan.(Author)
[en] This investigation concentrated on studying the effect of gamma rays on the Flight Ability Index and on the Dispersal of irradiated males because these two parameters were very important for applying Sterile Male Release Technique The results of this study showed that the Flight Ability Index of irradiated males as pupae of 3,4 and 5 days with the doses ranged from 45 to 120 Gray are highly significant p≤0.05 compared to control group during an experiment carried out under field conditions , The results showed that there was a reverse relationship between Flight Ability Index and Gamma rays doses . Furthermore, the results of this investigation also showed that there was a reverse relationship between mean average of males captured by the pheromone traps and gamma rays doses after 1,2,3, and 6 days from the release .
[en] This investigation was conducted at the experimental farms belonging to Nuclear Research Center, Inshas and El-Fayoum, Egypt. The aims of the present study were to induce genetic variability by gamma rays in the bread wheat cultivar Gemmiza 10 and to select some mutant lines characterized with high grain yield and evaluate the two wheat cultivars Sakha 93 and Gemmiza 10 as well as some selected mutants regarding their yield and its attributes to obtain maximum grain yield for genotypes in saline El-Fayoum and normal Inshas conditions. In M_2 generation, 13 promising variants were selected. In M_3 progeny test, the data indicated that most of the selected plants for high yielding expressed the characteristics of their M_2 selected plants, therefore, they were considered breed true. Results indicated that under normal and saline conditions significant differences were observed in plant height, spike length, number of tillers m"-"2 , number of grains spike , 1000 grain weight and grain yield. Values of investigated characters for cultivars and mutants under salinity conditions were found lower than those under normal conditions. Data recorded on number of tillers and grain yield under salinity conditions can be used as selection criteria to evaluate wheat genotypes. Mutant 5 showed greater grain yield stability across normal conditions (23.43%) and salinity conditions (22.15%) compared to other mutant lines and the best local cultivar Gemmiza 10.
[en] The effects of irradiating parental male full grown pupae of Agrotis ipsilon with the two substerile doses 100 and 150 Gray (Gy) followed by treated F_1 4"th instar larvae with three concentrations of the Barnoof plant leaves extract (0 , 15000 and 30000 ppm) or each of them alone were studied. The combined treatment of gamma irradiation and the Barnoof plant extract to F_1 larvae had a poisonous special effects on average total larval mortality when compared with the effect of gamma irradiation or plant leaves extract which of them alone. Gamma irradiation increased the susceptibility of F_1 larvae descendant from irradiated parental male pupae with 100 and 150 Gy to the Barnoof plant leaves extract. A gradual increase in susceptibility was noticed as the dose of radiation increase. The efficiency of gamma irradiation and / or plant leaves extract to inhibit the 4"th instar larvae of A. ipsilon was evaluated. The results showed highly toxic effect to the 4"th instar larvae at the two concentrations (15000 and 30000 ppm). On the other hand the dose 150 Gy combined with 30000 ppm of plant extract treatment (Acetone or Petroleum ether solvents) had highly effect on the 4"th instar larvae as compared with the other treatments.