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Analysis of bacitracin and its related substances by liquid chromatography tandem mass spectrometry

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Journal of Pharmaceutical Analysis 2017年第1期7卷 48-55页

作者： suleiman Ahmed suleiman Fan Song Mengxiang Su Taijun Hang Min Song Department of Pharmaceutical Analysis China Pharmaceutical University Nanjing 210009 China

A suitable liquid chromatography quadrupole time-of-flight mass spectrometric(LC–Q-TOF–MS) method was developed for separation and characterization of related substances in bacitracin test drug. The separation was performed on Li Chrospher RP-18 column using methanol as mobile phase A and 0.2% ammonium acetate buffer solution as mobile phase B in gradient elution. A total of 12 related substances were detected through high resolution mass spectrometric determination in a positive electrospray ionization mode. They were identified as co-existing active components and degradation products of bacitracin through the analysis and elucidation of both the protonated parents and the product ions of all the related substances and their fragmentation pathways were also proposed.

关键词： Bacitracin Degradation products Fragmentation pathways Related substances LC–Q-TOF–MS

Non-timber forest products and their contribution to households income around Falgore Game Reserve in Kano, Nigeria

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Ecological Processes 2017年第1期6卷 235-248页

作者： Muhammad Sabiu suleiman Vivian Oliver Wasonga Judith Syombua Mbau Aminu suleiman Yazan Ahmed Elhadi Department of Land Resource Management and Agricultural Technology University of NairobiP.O.Box 29053Loresho RidgeNairobiKenya Department of Agricultural Economics and Extension Bayero University KanoKanoNigeria

Introduction:In the recent decades,there has been growing interest in the contribution of non-timber forest products(NTFPs)to livelihoods,development,and poverty alleviation among the rural *** has been prompted by the fact that communities living adjacent to forest reserves rely to a great extent on the NTFPs for their livelihoods,and therefore any effort to conserve such resources should as a prerequisite understand how the host communities interact with ***:Multistage sampling technique was used for the study.A representative sample of 400 households was used to explore the utilization of NTFPs and their contribution to households’income in communities proximate to Falgore Game Reserve(FGR)in Kano State,*** statistics and logistic regression analysis were used to analyze and summarize the data ***:The findings reveal that communities proximate to FGR mostly rely on the reserve for firewood,medicinal herbs,fodder,and fruit nuts for household use and *** from NTFPs accounts for 20–60%of the total income of most(68%)of the sampled *** utilization of NTFPs was significantly influenced by age,sex,household size,main occupation,distance to forest and ***:The findings suggest that NTFPs play an important role in supporting livelihoods,and therefore provide an important safety net for households throughout the year particularly during periods of hardship occasioned by *** is suggested that stakeholders should prioritize technical and financial support programs on agricultural value addition and handcrafts that would promote off-farm income generating activities,in addition,provision of alternative domestic cooking energy such as biogas in communities proximate to FGR in order to reduce pressure relating to fuelwood gathering from the forest,this will help to improve forest resources quality.

关键词： Agricultural income Collection Conservation Forest income Game Reserve

Estimation of cost savings from participation of electric vehicles in vehicle to grid(V2G)schemes

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 249-258页

作者： Mahdi KIAEE Andrew CRUDEN suleiman SHARKH Energy Technology Research Group Engineering SciencesUniversity of Southampton Highfield CampusSouthampton SO171BJUK

The storage capacity of the batteries in an electric vehicle(EV)could be utilised to store electrical energy and give it back to the grid when needed by participating in vehicle to grid(V2G)*** participation could be a source of revenue for vehicle owners thus reducing the total charging cost of their EVs.A V2G simulator has been developed using MATLAB to find out the potential cost saving from participation of EVs in V2G schemes.A standard IEEE30 network has been modelled in the simulator which uses the MATPOWER engine to undertake power flow analysis.A novel control algorithm has been developed to take advantage of the difference between the selling and buying electricity prices by charging and discharging EVs at the appropriate *** scenarios are simulated to compare the total charging cost of EVs with or without the utilisation of V2G technology within the power system assuming a total of 5000 *** results of the simulation show that the applied control strategy with V2G is able to reduce the charging cost of EVs by 13.6%while satisfying the minimum requirement for state of charge(SoC)of the EV batteries to complete their next journey.

关键词： Electric vehicles Cost saving Electricity price Vehicle to grid

Fabrication of form stable NaCl-Al2O3 composite for thermal energy storage by cold sintering process

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Frontiers of Chemical Science and Engineering 2019年第4期13卷 727-735页

作者： Rilvaminu suleiman Qinghua Yu Yulong Ding Yongliang Li Birmingham Centre for Energy Storage School of Chemical EngineeringUniversity of BirminghamBirminghamB152TTUK

A form stable NaCl-Al2O3(50-50 wt-%)composite material for high temperature thermal energy storage was fabricated by cold sintering process,a process recently applied to the densification of ceramics at low temperature 300℃ under uniaxial pressure in the presence of small amount o f transient *** fabricated composite achieved as high as 98.65% of the theoretical *** NaCl-Al2O3 composite also retained the chloride salt without leakage after 30 heating-cooling cycles between 750℃-850℃ together with a holding period o f 24h at 850℃.X-ray diffraction measurements indicated congruent solubility o f the alumina in chloride salt,excellent compatibility o f NaCl with Al2O3,and chemical stability at high *** analysis by scanning electron microscope also showed limited grain growth,high density,uniform NaCl distribution and clear faceted composite structure without *** latent heat storage density o f 252.5J/g was obtained from simultaneous thermal *** strength test showed high sintered strength around 5 GPa after 50 *** composite was found to have fair mass losses due to ***,cold sintering process has the potential to be an efficient,safe and cost-effective strategy for the fabrication of high temperature thermal energy storage materials.

关键词： cold sintering process composite fabrication thermal energy storage phase change materials

Anomalous diffusion in branched elliptical structure

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Chinese Physics B 2023年第1期32卷 137-144页

作者： Kheder suleiman 张雪岚王二辉刘圣娜郑连存 School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

Diffusion in narrow curved channels with dead-ends as in extracellular space in the biological tissues,e.g.,brain,tumors,muscles,*** a geometrically induced complex diffusion and is relevant to different kinds of biological,physical,and chemical *** this paper,we study the effects of geometry and confinement on the diffusion process in an elliptical comb-like structure and analyze its statistical *** ellipse domain whose boundary has the polar equationρ(θ)=b/√1−e^(2)cos^(2)θ with 0

关键词： anomalous diffusion Fokker–Planck equation branched elliptical structure

Diffusion dynamics in branched spherical structure

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Chinese Physics B 2022年第11期31卷 172-178页

作者： Kheder suleiman Xue-Lan Zhang Sheng-Na Liu Lian-Cun Zheng School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

Diffusion on a spherical surface with trapping is a common phenomenon in cell biology and porous *** this paper,we study the diffusion dynamics in a branched spherical structure and explore the influence of the geometry of the structure on the diffusion *** process is a spherical movement that occurs only for a fixed radius and is interspersed with a radial motion inward and outward the *** scenarios govern the transport process in the spherical cavity:free diffusion and diffusion under external *** diffusion dynamics is described by using the concepts of probability density function(PDF)and mean square displacement(MSD)by Fokker–Planck equation in a spherical coordinate *** effects of dead ends,sphere curvature,and velocity on PDF and MSD are analyzed numerically in *** find a transient non-Gaussian distribution and sub-diffusion regime governing the angular *** results show that the diffusion dynamics strengthens as the curvature of the spherical surface increases and an external force is exerted in the same direction of the motion.

关键词： anomalous diffusion Fokker-Planck equation branched spherical structure

Performance of microhaematuria and proteinuria as measured by urine reagent strips in estimating intensity and prevalence of Schistosoma haematobium infection in Nigeria

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Asian Pacific Journal of Tropical Medicine 2011年第12期4卷 997-1000页

作者： Houmsou RS Kela SL suleiman MM Department of Biological Sciences Taraba State UniversityP.M.B 1167JalingoTaraba StateNigeria Biological Sciences Programme Abubakar Tafawa Balewa UniversityP.M.B 0248 BauchiBauchi StateNigeria

Objective:To assess if microhaematuria and proleinuria as measured by reagent strips could estimate intensity of Schistosoma haematobium(***) infection in endemic areas and evaluate their screening performance among children in Benue State,***:A lolal of 1124 urine samples were collected,screened for microhaematuria and proteinuria using reagent strips(Combi 9) and results were compared to filtration technique,the gold standard ***:A significant correlation was ohserved between microhaematuria(rho= 0.66. P<0.01).proteinuria(rho = 0.71.P<0.01) and intensity *** *** had sensitivity of 95.7%and specificity of 67.2%.while microhaematuria had sensitivity of 64.8%and specificity of 89.6%.The proportion of false positive diagnoses was higher in proleinuria(19.2%) than microliaematuria(6.0%).Conclusios:The findings suggest that use of urine reagent strips could potentially estimate intensity *** infection and their performance to screen urinary schistosomiasis agreed with previous observations.

关键词： Microhaematuria Proteinuria False positive Benue Stale Nigeria

Transmission Range-Aware Clustering for Green Cognitive Radio Ad Hoc Networks

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Journal of Electronic Science and Technology 2016年第2期14卷 145-151页

作者： Mahassin Mohamed Sharifah Kamilah Syed Yusof NikNoordini NikAbdMalik suleiman Zubair Department of Communication Faculty of Electrical EngineeringUniversity Technologi Malaysia81310 JohorBahruMalaysia

The absence of network infrastructure and opportunistic spectrum access in cognitive radio ad hoc networks （CRAHNs） results in connectivity and stability problems. Clustering is known as an effective technique to overcome this problem. Clustering improves network performance by implementing a logical network backbone. Therefore, how to efficiently construct this backbone among CRAHNs is of interest. In this paper, we propose a new clustering algorithm for CRAHNs. Moreover, we model a novel cluster head selection function based on the channel heterogeneity in term of transmission ranges. To the best of our knowledge, this is the first attempt to model the channel heterogeneity into the clustering formation in cognitive radio networks. Simulation results show that the performance of clustering is significantly improved by the channel heterogeneity considerations.

关键词： Channel heterogeneity cognitiveradio ad hoc network (CRAHNs) clustering.

Effect of Inclined Water Jets on Tensile Strength of Bicomponent Hydroentangled Nonwoven Fabrics

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Journal of Donghua University(English Edition) 2007年第3期24卷 413-418,423页

作者： MBWANa.suleiman Ndaro 靳向煜陈廷郁崇文 College of Textiles Donghua University

The effects of inclined water jets on bicomponent hydroentangled fabrics were investigated. The PET/COPET and PA6/PET hydroentangled fabrics were made by using designed inclined water jet apparatus. Effects of basis weight, water jets inclination angle and water jet pressure were discussed. The comparison was made on the average tensile strength of fabrics made by perpendicular water jets （0^o inclination angle） and inclined water jets of 20^o with pressure levels of 3 bars and 7 bars. It was found that increases of water jet pressure, the fabrics tensile strength were increased. Furthermore, increases of water jets inclination angle, fabric tensile strength of 60 g/m^2 fabrics decreased while for 100 g/m^2 fabrics tensile strength increased.

关键词： inclined wuter jets tensile strength h ydroentangledfabrics pie segmented fibers islands - in - the - sea fibers