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Numerical investigation for a hyperbolic annular fin with temperature dependent thermal conductivity

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Propulsion and Power Research 2016年第1期5卷 55-62页

作者： M.T.Darvishi F.Khani abdul aziz Department of Mathematics Razi UniversityKermanshah 67149Iran Department of Mechanical Engineering School of Engineering and Applied ScienceGonzaga UniversitySpokaneWA 99258USA

An annular fin of hyperbolic profile with temperature dependent thermal conductivity is studied by pseudospectral *** illustrating the effect of fin dimensions,surface convection characteristics and the thermal conductivity parameter on the thermal performance of the fin are presented and discussed.A comparison of the obtained numerical results is made with the closed form analytical solution available in the literature for the case of constant themal *** comparison confirms the high accuracy of numerical *** the thermal conductivity increases with temperature,the effect is to elevate both the temperature distribution in the fin and the fin *** converse is true when the themal conductivity decreases with temperature.

关键词： Hyperbolic annular fin Thermal performance Pseudospectral method

Impact of renewable power market penetration on coal power generation capacity growth

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 217-224页

作者： abdul Majeed aziz R. Larry Grayson VLADISLAV Kecojevic The Pennsylvania State University（University Park） 16802 USA West Virginia University Morgantown WV26506-6070 USA

Since renewable energy sources are growing in importance, how well they can penetrate the energy market for power generation will be a very important factor in the role the coal industry will play in the future. This paper examined the displacement of coal power plant capacity from 2010 to 2050 by renewables with respect to three drivers assumed under various conditions： the American Recovery and Reinvestment Act （ARRA）, Greenhouse Gas （GItG） policy, and varying plant capital cost cases. The results by 2050 illustrate that renewable market penetration captures anywhere from 1.9% to 6.4% of potential coal power generation capacity additions. Renewable power generation capacity additions is expected to outpace coal power plant additions by 89% with respect to ARRA in 2050, however with no GHG policy coal power generation capacity build-outs will outpace renewables by as high as 809%. Finally, coal power generation is still projected to be the largest single energy source contributor to the electricity market making up 28.0% of total available capacity, while renewables are expected to only make up 16.3% of total available capacity.

关键词： coal renewable energy power generation electricity policy

A Compromise Programming to Task Assignment Problem in Software Development Project

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Computers, Materials & Continua 2021年第12期69卷 3429-3444页

作者： Ngo Tung Son Jafreezal Jaafar Izzatdin abdul aziz Bui Ngoc Anh Hoang Duc Binh Muhammad Umar Aftab Department of Computer and Information Sciences Universiti Teknologi PetronasSeri Iskandar32610Malaysia Department of Information and Communication Technology FPT UniversityHanoi100000Vietnam Department of Computer Science National University of Computer and Emerging SciencesChiniot-Faisalabad CampusChiniot35400Pakistan.

The scheduling process that aims to assign tasks to members is a difficult job in project *** plays a prerequisite role in determining the project’s quality and sometimes winning the bidding *** study aims to propose an approach based on multi-objective combinatorial optimization to do this *** generated schedule directs the project to be completed with the shortest critical path,at the minimum cost,while maintaining its *** are several real-world business constraints related to human resources,the similarity of the tasks added to the optimization model,and the literature’s traditional *** support the decision-maker to evaluate different decision strategies,we use compromise programming to transform multiobjective optimization(MOP)into a single-objective *** designed a genetic algorithm scheme to solve the transformed *** proposed method allows the incorporation of the model as a navigator for search agents in the optimal solution search process by transferring the objective function to the agents’fitness *** optimizer can effectively find compromise solutions even if the user may or may not assign a priority to particular *** are achieved through a combination of nonpreference and preference *** experimental results show that the proposed method worked well on the tested dataset.

关键词： Makespan RCPSP scheduling MOP combinatorial optimization compromise programming genetic algorithm

Optimization of moderator assembly for neutron flux measurement:experimental and theoretical approaches

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Nuclear Science and Techniques 2017年第5期28卷 7-12页

作者： abdul Waheed Nawab Ali Muzahir A.Baloch aziz A.Qureshi Eid A.Munem Muhammad Usman Rajput Tauseef Jamal Wazir Muhammad Radiation Physics Laboratory Physics DepartmentCOMSATS Institute of Information Technology(CIIT)

A moderator of paraffin wax assembly has been demonstrated where its thickness can be optimized to thermalize fast neutrons. The assembly is used for measuring fast neutron flux of a neutron probe at different neutron energies, using BF03(U10and 200) and3He(U0.500)neutron detectors. The paraffin wax thickness was optimized at 6 cm for the neutron probe which contains an Am–Be neutron source. The experimental data are compared with Monte Carlo simulation results using MCNP5 version 1.4. Neutron flux comparison and neutron activation techniques are used for measuring neutron flux of the neutron probe to validate the optimum paraffin moderator thickness in the assembly. The neutron fluxes are measured at(1.17 ± 0.09) 9 105 and(1.19 ± 0.1) 9 105n/s, being in agreement with the simulated values. The moderator assembly can easily be utilized for essential requirements of neutron flux measurements.

关键词： Am–Be and 252Cf neutron sources BF3&3He detectors Paraffin wax Neutron flux Monte Carlo simulation

Inhibitive efficacy of Nymphoides indica rhizome extract onα-glucosidase, and cross-link formation of advanced glycation end products

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Journal of Traditional Chinese Medicine 2021年第3期41卷 376-380页

作者： Muhammad Hanif Muzammil Ahmad Khan Muhammad Ramzan abdul Rafey Ali Zaman Imran aziz Ama'null'ah Adnan Amin Gomal Centre of Biochemistry and Biotechnology(GCBB) Gomal University D.I.Khan29050Pakistan NPRL Department of PharmacognosyFaculty of PharmacyGomal University D.I.Khan29050Pakistan FVAS Gomal University D.I.Khan29050Pakistan

OBJECTIVE: To investigate the inhibitive efficacy of Nymphoides Indica(L.) Kuntze rhizome extract onα-glucosidase and on cross-link formation of advanced glycation end products(AGEs).METHODS: The plant extracts were prepared by cold maceration and fractionated in solvents of diverse polarity. The in vitro α-glucosidase inhibition assay, fluorescence spectrometry and SDS-PAGE analysis was performed for antiglycation ***: During α-glucosidase inhibition assay significant inhibition by chloroform(0.43 mg/mL)and methanol fractions(0.66 mg/mL) was *** the AGEs inhibition assay, both oxidative(BSA-MGO) and non-oxidative(BSA-glucose)modes were employed. The inhibition of AGEs by total extract was considered moderate(IC_(50)0.10 mg/mL) as a result of non-oxidative mode, whereas in case of oxidative mode(BASA-MGO) no activity was recorded. Among fractions the methanolic fraction presented significant results both in oxidative(IC_(50)0.01 mg/mL) and non-oxidative modes(IC_(50) 0.3 mg/mL). Likewise the ethyl acetate fraction was more active in non-oxidative mode(IC_(50)0.04 mg/mL) compared to oxidative mode(IC_(50)0.32 mg/mL).During assay for inhibition of cross-link formation,the chloroform fraction significantly inhibited cross-link formation in a dose dependent ***: It was finally concluded that N. Indica rhizome extract possesses significant properties that inhibit α-glucosidase, and AGEs cross-link formation.

关键词： Nymphoides Indica alpha-glucosidases glycation end products advanced protein cross links antiglycation

Low-energy X-ray attenuation characteristics of Rhizophora ***

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Nuclear Science and Techniques 2021年第3期32卷 11-29页

作者： Damilola Oluwafemi Samson Ahmad Shukri Mohd Zubir Mat Jafri Rokiah Hashim Mohd Zahri abdul aziz Sylvester Jande Gemanam Mohd Fahmi Mohd Yusof School of Physics Universiti Sains Malaysia11800 GelugorPenangMalaysia School of Industrial Technology Universiti Sains Malaysia11800 GelugorPenangMalaysia Advanced Medical and Dental Institute Universiti Sains Malaysia13200 BertamPenangMalaysia School of Health Sciences Universiti Sains Malaysia16150 Kota BharuKelantanMalaysia

Photon absorption parameters such as mass attenuation coefficients(μ_m),molar extinction coefficients(ε),total molecular(σ_(t,m)),atomic(σ_(t,a))and electronic(σ_(t,el))cross sections,half-value layers(X_(1/2)),tenth-value layers(X_(1/10)),mean free paths(λ),effective atomic numbers(Z_(eff)),and effective electron densities(N_(el))were estimated for defatted soy flour(DSF),soy protein concentrate(SPC),and soy protein isolate(SPI)-based Rhizophora *** composites substituted with 10 wt%sodium hydroxide(NaOH)and 0,5,10,and 15 wt%itaconic acid polyamidoamine-epichlorohydrin(IA-PAE)*** composition was assessed using ultrahigh-resolution field emission scanning electron microscopy-energy dispersive X-ray spectrometry(UHR-FESEM-EDX).The interaction parameters were evaluated for K_(α1)photons at16.59,17.46,21.21,and 25.26 keV,employing a low-energy germanium(LEGe)detector system and an~(241)Amγ-ray source.X-ray diffraction characterization revealed an amorphous phase in the developed particleboard *** DSF15',SPC15',and SPI15'exhibited the highest values ofμ_m,ε,σ_(t,m),Zeff,and N_(el)among all of the studied particleboard samples,within the range of measured photon *** addition,all of the modified samples exhibited lower X_(1/2),X_(1/10),λ,σ_(t,a),andσ_(t,el)than the unmodified samples,with DSF-,SPC-,and SPI/NaOH/Rhizophora spp./IA-PAE(15 wt%),indicating insignificant *** current results of the particleboard samples'analysis can be useful for medical radiation applications and shielding research.

关键词： Photon interaction parameters Shielding DSF–SPC–SPI Particleboards NaOH/IA-PAE

Gastric precancerous lesions are associated with gene variants in Helicobacter pylori -susceptible ethnic Malays

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World Journal of Gastroenterology 2013年第23期19卷 3615-3622页

作者： Sathiya Maran Yeong Yeh Lee Shuhua Xu Nur-Shafawati Rajab Norhazrini Hasan Syed Hassan Syed abdul aziz Noorizan abdul Majid Bin Alwi Zilfalil Human Genome Center School of Medical Sciences Universiti Sains Malaysia16150 Kubang Kerian Malaysia Department of Medicine School of Medical Sciences Universiti Sains Malaysia16150 Kubang Kerian Malaysia Max Planck Independent Research Group on Population Genomics Chinese Academy of Sciences and Max Planck Society Partner Institute for Computational Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences200031 Shanghai China Department of Immunology School of Medical Sciences Universiti Sains Malaysia16150 Kubang Kerian Malaysia Department of Surgery School of Medical Sciences Universiti Sains Malaysia16150 Kubang Kerian Malaysia Department of Paediatrics School of Medical Sciences Universiti Sains Malaysia16150 Kubang Kerian Malaysia

AIM: To identify genes associated with gastric pre-cancerous lesions in Helicobacter pylori (H. pylori )susceptible ethnic Malays. METHODS: Twenty-three Malay subjects with H. pylori infection and gastric precancerous lesions identified during endoscopy were included as "cases". Thirtyseven Malay subjects who were H. pylori negative and had no precancerous lesions were included as "controls". Venous blood was collected for genotyping with Affymetrix 50K Xba1 kit. Genotypes with call rates 0.5 was considered as significant markers. RESULTS: Of the 23 H. pylori -positive subjects recruited, one sample was excluded from further analysis due to a low genotyping call rate. Of the 22 H. pylori positive samples, atrophic gastritis only was present in 50.0%, complete intestinal metaplasia was present in 18.25%, both incomplete intestinal metaplasia and dysplasia was present in 22.7%, and dysplasia only was present in 9.1%. SNPs rs9315542 (UFM1 gene), rs6878265 (THBS4 gene), rs1042194 (CYP2C19 gene) and rs10505799 (MGST1 gene) were significantly associated with atrophic gastritis, complete intestinal metaplasia, incomplete metaplasia with foci of dysplasia and dysplasia, respectively. Allele frequencies in "cases" vs "controls" for rs9315542, rs6878265, rs1042194 and rs10505799 were 0.4 vs 0.06, 0.6 vs 0.01, 0.6 vs 0.01 and 0.5 vs 0.02, respectively. CONCLUSION: Genetic variants possibly related to gastric precancerous lesions in ethnic Malays susceptible to H. pylori infection were identified for testing in subsequent trials.

关键词： Gastric precancerous lesions Gene polymorphisms Genome-wide association Helicobacter pylori Malays

Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies

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Journal of Natural Gas Chemistry 2012年第1期21卷 29-36页

作者： Muhammad Arif Ab aziz Nur Hidayatul Nazirah Kamarudin Herma Dina Setiabudi Halimaton Hamdan Aishah abdul Jalil Sugeng Triwahyono Department of Chemical Engineering Faculty of Chemical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia Ibnu Sina Institute for Fundamental Science Studies Faculty of Science Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia

Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2＋/N,N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740-3500 cm-1, Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm-1 and the sharp band at 3740 cm-1 with simultaneous development of new absorbance band at 3700 cm-1 that was attributed to （-OH）Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups （terminal- and structural-defect OH groups）. The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn＇t exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.

关键词： Ni.Ni/PtHY n-pentane isomerization hydrogen protonic acid sites

Catalytic methanation reaction over alumina supported cobalt oxide doped noble metal oxides for the purification of simulated natural gas

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燃料化学学报 2012年第7期40卷 822-830页

作者： Wan Azelee Wan Abu Bakar Rusmidah Alil abdul aziz abdul Kadir Salmiah Jamal Mat Rosid Nurul Shafeeqa Mohammad Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Faculty of Petroleum and Renewable Energy Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

A series of alumina supported cobalt oxide based catalysts doped with noble metals such as ruthenium and platinum were prepared by wet impregnation *** variables studied were difference ratio and calcination ***/Co(10∶90)/Al2O3 catalyst calcined at 700 ℃ was found to be the best catalyst which able to convert 70.10% of CO2 into methane with 47% of CH4 formation at maximum temperature studied of 400 ℃.X-ray diffraction analysis showed that this catalyst possessed the active site Co3O4 in face-centered cubic and PtO2 in the orthorhombic phase with Al2O3 existed in the cubic *** to the FESEM micrographs,both fresh and spent Pt/Co(10∶90)/Al2O3 catalysts displayed small particle size with undefined *** Adsorption analysis showed that 5.50% reduction of the total surface area for the spent Pt/Co(10∶90)/Al2O3 ***,Energy Dispersive X-ray analysis(EDX) indicated that Co and Pt were reduced by 0.74% and 0.14% respectively on the spent Pt/Co(10∶90)/*** using FT-IR and TGA-DTA analysis revealed the existence of residual nitrate and hydroxyl compounds on the Pt/Co(10∶90)/Al2O3 catalyst.

关键词： natural gas cobalt oxide noble metal catalyst methanation reaction