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Iterative Bayesian Monte Carlo for nuclear data evaluation

Nuclear Science and Techniques 2022年第4期33卷 105-135页

作者： Erwin alhassan Dimitri Rochman Alexander Vasiliev Mathieu Hursin Arjan JKoning Hakim Ferroukhi Laboratory for Reactor Physics and Thermal-Hydraulics Paul Scherrer Institute5232 VilligenSwitzerland Division Large Research Facilities(GFA) Paul Scherrer InstituteVilligenSwitzerland Ecole Polytechnique Federale de Lausanne LausanneSwitzerland Nuclear Data Section International Atomic Energy Commission(IAEA)ViennaAustria Division of Applied Nuclear Physics Department of Physics and AstronomyUppsala UniversityUppsalaSweden

In this work,we explore the use of an iterative Bayesian Monte Carlo(iBMC)method for nuclear data evaluation within a TALYS Evaluated Nuclear Data Library(TENDL)*** goal is to probe the model and parameter space of the TALYS code system to find the optimal model and parameter sets that reproduces selected experimental *** method involves the simultaneous variation of many nuclear reaction models as well as their parameters included in the TALYS ***‘best’model set with its parameter set was obtained by comparing model calculations with selected experimental *** experimental data types were used:(1)reaction cross sections,(2)residual production cross sections,and(3)the elastic angular *** improve our fit to experimental data,we update our‘best’parameter set—the file that maximizes the likelihood function—in an iterative *** was determined by monitoring the evolution of the maximum likelihood estimate(MLE)values and was considered reached when the relative change in the MLE for the last two iterations was within 5%.Once the final‘best’file is identified,we infer parameter uncertainties and covariance information to this file by varying model parameters around this *** this way,we ensured that the parameter distributions are centered on our *** proposed method was applied to the evaluation of p+^(59)Co between 1 and 100 ***,the adjusted files were compared with experimental data from the EXFOR database as well as with evaluations from the TENDL-2019,JENDL/He-2007 and JENDL-4.0/HE nuclear data libraries.

关键词： Iterative Bayesian Monte Carlo(iBMC) Nuclear reaction models Model parameters Adjustments Bayesian calibration Nuclear data TALYS

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Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment

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Water Science and Engineering 2024年第2期17卷 139-149页

作者： Hamidatu alhassan Ying Woan Soon Anwar Usman Voo Nyuk Yoong Department of Physics Universiti Brunei DarussalamBandar Seri Begawan BE1410Brunei Department of Chemical Sciences Universiti Brunei DarussalamBandar Seri Begawan BE1410Brunei

Three-dimensional(3D)porous absorbents have attracted significant attention in the oily wastewater treatment technology due to their high porosity and *** their amphiphilic surface,they have a propensity to simultaneously absorb water and oil,which restricts their range of *** this study,a reduced graphene oxide and titanium dioxide nanocomposite(rGO/TiO_(2))was used to fabricate an ultra-hydrophobic melamine sponge(MS)through interfacial modification using a solution immersion *** further modify it,poly-dimethylsiloxane(PDMS)was grafted onto its surface to establish stronger covalent bonds with the *** water contact angle of the sponge(rGO/TiO_(2)/PDMS/MS)was 164.2°,which satisfies the condition for *** evidence of its water repellency was demonstrated by the Cassie-Baxter theory and the lotus leaf *** a result of the increased density of rGO/TiO_(2)/PDMS/MS,it recorded an initial capacity that was 2 g/g lower than the raw MS for crude oil *** raw MS retained 53% of its initial absorption capacity after 20 cycles of absorption,while rGO/TiO_(2)/PDMS/MS retained 97%,suggesting good *** oil and organic solvent recovery(90%-96%)was demonstrated by rGO/TiO_(2)/PDMS/MS in oil-water *** a continuous separation system,it achieved a remarkable separation efficiency of 2.4×10^(6)L/(m^(3)·h),and in turbulent emulsion separation,it achieved a demulsification efficiency of 90%-91%.This study provides a practical substitute for massive oil spill cleaning.

关键词： Oily wastewater Reduced graphene oxide Polydimethylsiloxane(PDMS) Emulsion separation Melamine sponge

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On B(5,20)2-Groups

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Algebra Colloquium 2024年第3期31卷 429-440页

作者： E.A.alhassan Y.L.Tan Y.Li School of Mathematical Sciences Jiangsu UniversityZhenjiangJiangsu 212013China Department of Mathematics Brock UniversitySt.CatharinesOntario L2S 3A1Canada

A finite group G is said to be a B(n,k)group if for any n-element subset[a_(1),…,a_(n)]of G,|{a_(i)a_(j)|1≤i,j≤n}|≤*** is of interest to characterize the structure of B(n,k)groups for n(n+1)/2≤k≤n^(2)-*** B(5,k)groups for 15≤k≤19 have been investigated by several *** this paper,we give a complete characterization of B(5,20)2-groups by showing there are five classes of such groups which are nontrivial and nonabelian.

关键词： B(n,k)groups small squaring property central extension GAP

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Geoelectrical Investigation of Groundwater Potentials of Northern Paiko,Niger State,North Central Nigeria

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Journal of Earth Science 2017年第1期28卷 103-112页

作者： Usman D.alhassan Daniel Nnaemeka Obiora Francisca Nneka Okeke Department of Physics Federal University of Technology Department of Physics and Astronomy University of Nigeria

Vertical electrical sounding（VES） was carried out in northern part of Paiko, North Central Nigeria, using Abem terrameter model SAS 4000 to determine the subsurface layer parameters（resistivities, depths and thickness） employed in delineating the groundwater potential of the area. A total of six transverses with ten VES stations along each traverse, at intervals of 50 m were investigated. It has a maximum current electrode separation（AB/2） of 100 m. Three to four distinct geoelectric layers were observed, namely, the top layer, the weathered layer, the fractured/fresh layer, and the fresh basement layer. The observed frequencies in curve types include 21% of H, 4.2% of HA, 2.4% of K, 4.2% of A, 1.67% of KH and 3% of HK. Eight VES stations were delineated as ground water potentials of the area, with third and fourth layer resistivities ranging from 191 to 398 ？·m. Depths range from 13.60 to 36.60 m and thickness varies from 9.23 to 30.51 m. A correlation of the borehole log with the VES lithology is in agreement. Viable boreholes for good portable water should be sited at VES stations J8 and J10 having a fine aquifer at a depth of 36.60 and 17.80 m respectively with thickness of 30.51 and 15.07 m, respectively.

关键词： vertical electrical sounding groundwater potential northern Paiko resistivity aquifer,geoelectric layer Abem terrameter.

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桥面板与覆层结合界面的干燥收缩诱导应力估算(英文)

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硅酸盐学报 2011年第1期39卷 92-98页

作者： MOHAMMAD A alhassan MOHSEN A Issa Assistant Professor of Civil Engineering Department of EngineeringIndiana-Purdue University Fort Wayne(IPFW) Professor of Civil Engineering Civil and Materials Engineering Department University of Illinois at Chicago

采用三维非线性有限元分析方法评价与估算了桥面板与混凝土覆层间结合界面的干燥收缩诱导应力,并采用修正Fowler准则测算了桥面板与聚合物覆层间的热诱导应力。在评价覆层与面板间相对厚度to/ts的影响时,ts取常数200 mm;在评价相对弹性... 详细信息

采用三维非线性有限元分析方法评价与估算了桥面板与混凝土覆层间结合界面的干燥收缩诱导应力,并采用修正Fowler准则测算了桥面板与聚合物覆层间的热诱导应力。在评价覆层与面板间相对厚度to/ts的影响时,ts取常数200 mm;在评价相对弹性模量Eo/Es的影响时,Es取常数,27.5 GPa,并设定了3个Eo/Es比值,分别是0.5,0.75,1.0。在评价每个Eo/Es比值的影响时,考虑3个to/ts比值,其值分别为0.281,0.375,0.45,并对应3个覆层厚度值,分别为55,75,3.6,90 mm。结果表明:收缩诱导剪切应力与黏结应力随Eo/Es比值及to/ts比值的增加而增加;有限元分析结果与修正Fowler准则测算结果表现出相同的变化趋势,但由前者估算的黏结应力要比由后者估算的高很多。对诱导黏结应力有重要影响或者会导致黏结强度下降的其他因素也进行了深入讨论。

关键词：收缩覆层黏结应力桥面板有限元分析

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Development of multiple mobile networks call detailed records and its forensic analysis

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Digital Communications and Networks 2019年第4期5卷 256-265页

作者： Emmanuel Abba A.M.Aibinu J.K.alhassan Department of Cyber Security Science Federal University of TechnologyMinnaNigeria Department of Mechatronics Engineering Federal University of TechnologyMinnaNigeria

Call Detailed Records(CDR)are generated and stored in Mobile Networks(MNs)and contain subscriber’s information about active or passive usage of the network for various communication *** spatio-temporal nature of CDR makes them a valuable dataset used for forensic *** in technology have led to the seamless communication across Multiple Mobile Network(MMN),which poses a threat to the availability and integrity of CDR *** CDR implementation is capable of logging peer-to-peer communications over single connection only,thus necessitating improvements on how the CDR data is stored for forensic *** this paper,the problem is solved by identifying and conceptually modelling six new artifacts generated by such communication *** newly identified artifacts are introduced into the existing CDR for an incident capturing of the required data for forensic analysis during investigations involved in the MMN *** show an improved absolute speed of 0.0058 s for the MMN-CDR to associate a suspect with an incident,which is 0.0038 s faster than the speed of 0.0097s for the existing CDR to associate a suspect with an ***,a novel method for forensically tracking calls over the MMN has been *** MMN-CDR,when forensically analyzed,reveals an increase in time efficiency over the existing CDR due to its high absolute ***,higher accuracy and completeness percentage are both obtained.

关键词： CDR Investigation Multiple mobile networks Suspect

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Hydrochemical characterization of groundwater in Balad district, Salah Al-Din Governorate, Iraq

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Journal of Groundwater Science and Engineering 2018年第4期6卷 306-322页

作者： alhassan H Ismail Muntasir A Shareef Wesam Mahmood Middle Technical University Institute of Technology-Baghdad Water Resources Techniques Department

The assessment of hydrochemical quality of groundwater is very important to explore its nature and usefulness. In this paper, groundwater quality evaluation is carried out in the Balad district, Salah Al-Din Governorate, Iraq. A total of 28 groundwater samples are collected from shallow tube wells and analyzed for various physicochemical parameters. Groundwater suitability for drinking is evaluated based on the World Health Organization(WHO) and Iraqi standards, and suitability of groundwater for irrigation is assessed based on various hydrochemical parameters. The results reveal that the dominant types of groundwater based on piper diagram are mixed CaMgCl and CaCl. Gibbs ratio indicates that the groundwater in the studied area is affected by the evaporation process. The cation-anion exchange reaction in the studied area demonstrates that 54% of the groundwater samples indicate a direct base(cation-anion) exchange reaction, while 46% of the groundwater samples indicating the chloro-alkaline disequilibrium. Furthermore, generally all of the groundwater samples are unsuitable for drinking and irrigation. Cluster analysis reveals two different groups of similarities between the groundwater samples, reflecting different pollution levels in the studied area.

关键词： Balad district Groundwater chemistry Water quality Cluster analysis GIS

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Evaluation of WEPP versus EGEM and empirical model efficiencies in predicting ephemeral gully erosion around Mubi area,Northeast Nigeria

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International Soil and Water Conservation Research 2021年第1期9卷 11-25页

作者： Ijasini John Tekwa John Mathew Laflen Abubakar Musa Kundiri Abdullahi Bala alhassan Department of Soil Science&Land Resources Management Federal University WukariP.M.B1020Wukari Taraba StateNigeria USDA-ARS National Soil Erosion Research LaboratoryPurdue UniversityLafayetteINUSA Department of Soil Science Faculty of AgricultureUniversity of MaiduguriP.M.B1069Borno StateNigeria

Evaluation of prediction models is crucial to achieving valid information on erosion processes and their management *** model efficiency in predicting ephemeral gully(EG)erosion was recently tested and compared with both EGEM and empirical *** models abilities to predict EG erosion were validated using measured estimates at the 6 eroding locations around Mubi area in Northeast Nigeria between April 2008 and October *** location consisted of 3 watersheds where data on soils,climate,slope,management practices,EG shapes and dimensions were *** on relevant soil properties were collected in the field and then analyzed in *** mass of soil loss(MSL)predicted by empirical,EGEM and WEPP models were compared with the measured using paired T-test,regression graphs(r^(2)-values),error analysis,and analysis of variance(ANOVA)in a completely ran-domized *** EG erosion losses varied significantly(P≤0.05)between sites and *** sig-nificant(P≤0.05)differences were observed between measured and the empirically predicted aggregate *** measured aggregate MSL strongly correlated with those predicted by empirical(r^(2)=0.67),than with EGEM(r^(2)=0.57),and WEPP(r^(2)=0.53)*** over and under-prediction instances against the measured erosion were noted with all the *** WEPP model was found to slightly over-predict MSL when compared to either the empirical or EGEM *** prediction quality of the models was generally *** works should focus more on local inputs such as climate,plants,management,and tillage data for use with WEPP.

关键词： Empirical EGEM WEPP Ephemeral gully erosion Soil loss Mubi Northeast Nigeria

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A Critical Evaluation of Regional Economic Integration in Africa: a Case Study of ECOWAS

A Critical Evaluation of Regional Economic Integration in Af...

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作者： alhassan Bunani Kamara 外交学院

学位级别：硕士

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掺粉煤灰的桥面铺装层混凝土的性能(英文)

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硅酸盐学报 2011年第10期39卷 1644-1650页

作者： alhassan Mohammad A ASHUR Suleiman A Indiana-Purdue University Fort Wayne 2101 E Coliseum Blvd Room # 327AFort WayneIN 46805

用掺20%的C级粉煤灰水泥制备了一种新的粉煤灰混凝土(fly ash concrete,FAC)面层材料,总的胶凝材料(cementitious materials,CM)密度为394 kg/m3,并根据设计需要添加了一定量的纤维以增强材料的抗裂性能。本实验测试了面层材料的抗压和... 详细信息

用掺20%的C级粉煤灰水泥制备了一种新的粉煤灰混凝土(fly ash concrete,FAC)面层材料,总的胶凝材料(cementitious materials,CM)密度为394 kg/m3,并根据设计需要添加了一定量的纤维以增强材料的抗裂性能。本实验测试了面层材料的抗压和抗折强度、黏接强度、收缩率、渗透系数、残余强度,并与目前广泛应用的乳液改性混凝土(latex-modified concrete,LMC)和微硅粉混凝土(microsilica concrete,MSC)面层材料的测试结果进行了对比。结果表明:对比LMC和MSC面层材料,这种新的粉煤灰混凝土面层材料具有更高的性能,更能满足混凝土面层的要求,并能够有效的降低成本。

关键词：面层材料混凝土粉煤灰掺面铺装层

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