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| 1 | Assessment of the power deposition on the MEGAPIE spallation target using the GEANT4 toolkit显示文摘This work aims at evaluating the reliability of the GEANT4(GEometry ANd Tracking 4) Monte Carlo(MC) toolkit in calculating the power deposition on the Megawatt Pilot Experiment(MEGAPIE), the first liquid–metal spallation target worldwide. A new choice of codes to study and optimize this target is provided. The evaluation of the GEANT4 toolkit is carried out in comparison with the MCNPX and FLUKA MC codes. The MEGAPIE is an international project led by the Paul Scherrer Institute in Switzerland. It aims to demonstrate the safe operation of an intense neutron source to power the next generation of nuclear reactors, accelerator-driven systems(ADSs). In this study, we used the GEANT4 MC toolkit to calculate the power deposited by fast protons on the MEGAPIE target.The calculation focuses on several structures and regions.The predictions of our calculations were compared and discussed with that of the MCNPX and FLUKA codes,adopted by the MEGAPIE project. The comparison shows that there is a very good agreement between our results and those of the reference codes. | Abdesslam Lamrabet Abdelmajid Maghnouj Jaouad Tajmouati Mohamed Bencheikh | 2019 | Nuclear Science and Techniques2019，30，4： | 2 |
| 2 | Antioxidant activities and total phenol content of Inula viscosa extracts selected from three regions of Morocco显示文摘Objective:To investigate antioxidant activity,total phenolic and flavonoid content of ethanol(E) and ethyl acetate(A) extracts of Inula viscosa aerial parts selected from three regions of Morocco(Imouzzer.Sefrou and Taounate).Methods:Antioxidants properties were measured by three different test systems of assay namely free radical scavenging activities against 2,2-diphenyI-1-picrylhydrazyl,total antioxidant capacity and iron-reducing capacity.Total phenolic content was measured by FolinCiocalteu reagent.Results:All the extracts showed significant antioxidant activities and contained important levels of phenols.The ethanol extract(0.3 mg/mL) from Sefrou showed the greatest antioxidant capacity in the three systems of assay,which was probably due to its high content of polyphenols(274.39±6.94) mg gallic acid equivalent/g dry extract.Total flavonoid content was found equal for all extracts.Conclusions:Our results of antioxidant assays were justified and partially supported the popular usage of the tested plants.The high antioxidant activity found in the plant from Sefrou and its great biomass in this region suggested that Inula viscosa is a good source of natural antioxidants compounds which might have benefits for health. | Naima Chahmi Jaouad Anissi Sanae Jennan Abdellah Farah Khalid Sendide Mohammed El Hassouni | 2015 | Asian Pacific Journal of Tropical Biomedicine2015，5，3： | 1 |
| 3 | Design and Implementation of a Digitally Controlled Photovoltaic System Using Series Connected Buck Converters显示文摘 | Jaouad Tanouti Mohammed Setti Abdelhak Aziz El Mamoun Aziz | 2012 | Journal of Environmental Science and Engineering(B)2012，1，4： | 0 |
| 4 | Supplemental feeding on rangelands:new dynamics of the livestock in the El Ouara rangelands in southern Tunisia显示文摘Fodder production in arid rangelands has been traditionally considered as the main source of nutrition for livestock.However,the production of these fodder may be influenced by some socio-economic and climatic factors.This study aims to identify the various rangeland use forms and determine the types of livestock feeding system in the El Ouara rangelands of Ben guarden District in southern Tunisia by analysing the importance of supplemental feeding and main determinants of this practice.Data were collected by a survey that targeted a sample of 50 breeders in the El Ouara rangelands.Descriptive statistics and binary logistic regression were used to analyse the data.The results showed that there are two types of association practiced by breeders:“Cherka”association practiced by 10.00% of breeders and cash payment association practiced by 53.00% of breeders.Then,transhumance,sedentary,and semi-urban forms are the main ways in which breeders use the rangelands.There are four livestock feeding systems in the El Ouara rangelands being used to feed livestock:natural rangeland,rangeland-based,mixed,and concentrate-based feeding systems.Supplemental feeding has become fundamental for the livestock feeding system in the El Ouara rangelands.The breeders with the largest camel size still use the natural rangeland feeding system,while the breeders who have the largest herd size practice the mixed feeding system.The logistic regression results reveal that breeder age,cereal area,herd size,migrant remittance,second activity,and agricultural development group membership can significantly impact the supplemental feeding.In summary,this study can help policy-makers plan innovative practices based on climatic change,ensure the sustainability of livestock feeding system,and make effective decisions for local development. | Houda RJILI Mohamed JAOUAD Chaker SELMI | 2023 | Regional Sustainability2023，4，4： | 0 |
| 5 | Small ruminant value chain in Al-Ruwaished District,Jordan显示文摘This study aims to assess the small ruminant value chain in Al-Ruwaished District,Jordan,to identify the potential intervention areas that could improve the production efficiency and guarantee the sustainability of the small ruminant sector in this area.Sheep breeding is the source of livelihood for most of the people in Al-Ruwaished District,which is characterized by the large number of sheep and goats.We surveyed 5.0% of the small ruminant holders in the study area and conducted individual interviews and surveys with the potential actors in the value chain to undertake a small ruminant value chain analysis.From the survey,we found that the small ruminant value chain consists of five core functions,namely,input supply,production management,marketing,processing,and consumption.Despite the stable impression given by the large number of holdings in the small ruminant sector,the surveyed results show a clear fragility in the value chain of small ruminants in this area.The small ruminant production system is negatively impacted by climate change,especially continuous drought.In addition,the high prices of feed that the farmer cannot afford with clear and real absence of the governmental and non-governmental support activities also impact the development of the value chain.The results of strengths,weaknesses,opportunities,and threats(SWOT)analysis reveal that the major constraints faced by this value chain could be divided into external and internal threats.Specifically,the most prominent external threats are the nature of the desert land and continuous drought,while the major internal threats are the absence of appropriate infrastructure,shortage of inputs,and weakness in the production management and marketing.We proposed solutions to these challenges to ensure the sustainability and effectiveness of the sector,such as the formulation of emergency response plans to severe weather,qualifying farmers’skills,and establishment of agricultural cooperative societies. | Rula AWAD Hosam TITI Aziza MOHAMED-BRAHMI Mohamed JAOUAD Aziza GASMI-BOUBAKER | 2023 | Regional Sustainability2023，4，4： | 0 |
| 6 | Production threshold impact on a GEANT4 calculation of the power deposition in a fast domain: MEGAPIE spallation target显示文摘The calculation time in the Monte Carlo simulations consistently represents an essential issue. It is often very long, and its decrease constitutes a challenge for the simulator. Generally, an MC simulation is qualified as quality or not according to two main criteria: the calculation time and the accuracy of the results. However, in most cases, the optimization of one criterion affects negatively the other. Therefore, a compromise between both of them is always required in this kind of simulation. The present work aims at studying the impact of the production threshold(or cut) of the GEANT4 toolkit on the calculation of the power deposition in the MEGAPIE spallation target.The production threshold of secondaries is a GEANT4 intrinsic parameter. It indicates the limit of energy we can reach in the production of secondary particles. This study has allowed us to make the following conclusions. First,the influence of the cut on the calculation of the deposited power depends on the volume size, its arrangement and the importance of the electromagnetic processes occurring within. Second, the accuracy of the calculations can be acceptable only below a given value of the cut energy.Third, this accuracy remains almost unchangeable from a certain value of the cut. The study has also made it possible to explore the prevalence of certain interactions in the zone of spallation in the MEGAPIE target. | Abdesslam Lamrabet Abdelmajid Maghnouj Jaouad Tajmouati Mohamed Bencheikh | 2019 | Nuclear Science and Techniques2019，30，5： | 0 |
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