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The sol-gel derived Co-Mn/TiO_2 catalysts for light olefins production

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燃料化学学报 2014年第2期42卷 212-218页

作者： Mohammad Mehdi Khodaei Mostafa Feyzi jahangir Shahmoradi Mohammad Joshaghani Faculty of Chemistry Razi University

在这个研究工作，二 30%(Co-Mn )/TiO2 催化剂用大音阶的第五音胶化(催化剂 A ) 和一起沉淀(催化剂 B ) 被准备方法。到在 Fischer-Tropsch 合成(英尺) 的 C24 轻石蜡的活动和选择在不同运作的条件下面在一个改正床反应堆被学习了。这... 详细信息

在这个研究工作，二 30%(Co-Mn )/TiO2 催化剂用大音阶的第五音胶化(催化剂 A ) 和一起沉淀(催化剂 B ) 被准备方法。到在 Fischer-Tropsch 合成(英尺) 的 C24 轻石蜡的活动和选择在不同运作的条件下面在一个改正床反应堆被学习了。这些运作的条件是：温度

关键词： Fischer-Tropsch synthesis light olefins characterization

Flow of Burgers' fluid over an inclined stretching sheet with heat and mass transfer

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Journal of Central South University 2015年第8期22卷 3180-3188页

作者： T.Hayat Sadia asad A.Alsaedi Department of Mathematics Quaid-i-Azam University Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Department of Mathematics Faculty of Science King Abdulaziz University

Effects of heat and mass transfer in the flow of Burgers fluid over an inclined sheet are discussed. Problems formulation and relevant analysis are given in the presence of thermal radiation and non-uniform heat source/sink. Thermal conductivity is taken temperature dependent. The nonlinear partial differential equations are simplified using boundary layer approximations. The resultant nonlinear ordinary differential equations are solved for the series solutions. The convergence of series solutions is obtained by plotting theη-curves for the velocity, temperature and concentration fields. Results of this work describe the role of different physical parameters involved in the problem. The Deborah numbers corresponding to relaxation time(β1 and β2) and angle of inclination(α) decrease the fluid velocity and concentration field. Concentration field decays as Deborah numbers corresponding to retardation time(β3) and mixed convection parameter(G) increase. Large values of heat generation/absorption parameters A/B, and the temperature distribution across the boundary layer increase. Numerical values of local Nusselt number,-θ′(0), and local Sherwood number,-f′(0), are computed and analyzed. It is found that θ′(0) increases with an increase in β3.

关键词： Burgers' fluid thermal radiation inclined stretching sheet non-uniform heat source variable thermal conductivity

Swine flu pandemic:a global concern

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Asian Pacific Journal of Tropical Medicine 2010年第1期3卷 81-82页

作者： asad U Khan Interdisciplinary Biotechnology Unit AMU Aligarh 202002 India

Recently WHO has again declared Influenza pandemic due to the outbreak of H1N1 which has infected over 254,206 people in 80 countries,with 625 *** lab has started working on the proteome analysis of H1N1,2009 out brea... 详细信息

关键词： Influenza A Virus Swine

Computation Rate Maximization in Multi-User Cooperation-Assisted Wireless-Powered Mobile Edge Computing with OFDMA

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China Communications 2023年第1期20卷 218-229页

作者： Xinying Wu Yejun He asad Saleem College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Guangdong Engineering Research Center of Base Station Antennas and Propagation Shenzhen Key Laboratory of Antennas and PropagationShenzhen 518060China

In the era of Internet of Things(Io T),mobile edge computing(MEC)and wireless power transfer(WPT)provide a prominent solution for computation-intensive applications to enhance computation capability and achieve sustainable energy supply.A wireless-powered mobile edge computing(WPMEC)system consisting of a hybrid access point(HAP)combined with MEC servers and many users is considered in this *** particular,a novel multiuser cooperation scheme based on orthogonal frequency division multiple access(OFDMA)is provided to improve the computation performance,where users can split the computation tasks into various parts for local computing,offloading to corresponding helper,and HAP for remote execution respectively with the aid of ***,we aim at maximizing the weighted sum computation rate(WSCR)by optimizing time assignment,computation-task allocation,and transmission power at the same time while keeping energy neutrality in *** transform the original non-convex optimization problem to a convex optimization problem and then obtain a semi-closed form expression of the optimal solution by considering the convex optimization *** results demonstrate that the proposed multi-user cooperationassisted WPMEC scheme greatly improves the WSCR of all users than the existing *** addition,OFDMA protocol increases the fairness and decreases delay among the users when compared to TDMA protocol.

关键词： mobile edge computing(MEC) wireless power transfer(WPT) user cooperation OFDMA convex optimization

Pollen morphology and trichome types of Betula spp. in the Hyrcanian forests of northern Iran

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Journal of Forestry Research 2019年第4期30卷 1191-1198页

作者： Vahide Payamnoor Ali Sattarian Amir Kordalivand jahangir Mohammadi Gonbad Kavous University

Pollen and trichome morphology of the genus Betula were evaluated from three main habitats in Iran using light and electron *** types were identical and tri-porate;however,in terms of quantitative data,some differences were observed in exine(outside)wall thickness,length of polar axis and length of equatorial axis,possibly due to the *** alone is insufficient to separate species of Iranian *** of the trichome trait(small hairs or other outgrowths)revealed that birch species in Iran belong to:(1)Betula litwinowii *** to the low density of trichomes on the adaxial surface of the leaves and the lack of trichomes on the abaxial surface and many trichomes on the petioles;(2)Betula pendula *** to the absence of trichomes on the adaxial surface and the low density of trichomes on the abaxial surface;and,(3)in the adaxial and abaxial surfaces of leaves and petioles,the trichomes had different types of pilose(long,soft hairs),and this strengthens the possibility of a different species or more likely a hybrid of ***.

关键词： Birch Pollen morphology Trichome types

Phase synchronization and synchronization frequency of two-coupled van der Pol oscillators with delayed coupling

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Chinese Physics B 2013年第7期22卷 79-83页

作者： Hossein Gholizade-Narm asad Azemi Morteza Khademi Faculty of Electrical Electronic & Robotic EngineeringShahrood University Technology College of Engineering Penn State University Faculty of Engineering Ferdowsi University of Mashhad

In this paper, phase synchronization and the frequency of two synchronized van der Pol oscillators with delay coupling are studied. The dynamics of such a system are obtained using the describing function method, and the necessary conditions for phase synchronization are also achieved. Finding the vicinity of the synchronization frequency is the major advantage of the describing function method over other traditional methods. The equations obtained based on this method justify the phenomenon of the synchronization of coupled oscillators on a frequency either higher, between, or lower than the highest, in between, or lowest natural frequency of the aggregate oscillators. Several numerical examples simulate the different cases versus the various synchronization frequency delays.

关键词： van der Pol oscillator delay coupling phase synchronization synchronization frequency

Electromechanical Fields and Their Influence on the Internal Quantum Efficiency of GaN-Based Light-Emitting Diodes

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Acta Mechanica Solida Sinica 2018年第3期31卷 383-390页

作者： Muhammad Usman Kiran Saba Adnan jahangir Muhammad Kamran Nazeer Muhammad Department of Engineering Sciences Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Swabi 23460 Pakistan Department of Mathematics COMSATS Institute of Information Technology Wah Cantt 47040 Pakistan Department of Electrical Engineering COMSATS Institute of Information Technology Wah Cantt 47040 Pakistan

The effect ofelectromechanical fields, i.e., polarization fields, on the efficiency droop of GaN-based light-emitting diodes is presented using both experimental and numerical analyses. The role of incorporating such polarization charge density in device performance is numerically investigated and further compared with the experimental results of internal quantum efficiency of three different devices in consideration.

关键词： Optoelectronic devices Photonic bandgap materials Visible and ultraviolet sources Light-emitting devices

Environmental impact prediction using remote sensing images

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 381-390页

作者： Pezhman ROUDGARMI Masoud MONAVARI jahangir FEGHHI Jafar NOURI Nematollah KHORASANI Tehran Agricultural and Natural Resources Research Center Agricultural Research and Education Organization (AREO) Tehran Iran Department of Environmental Management Graduate School of the Environment and Energy Science and Research Campus IAU Tehran Iran Department of Environmental Science Graduate School of the Environment and Energy Science and Research Campus IAU Tehran Iran Department of Forestry and Forest Economics Faculty of Natural Resources University of Tehran Karaj Iran Department of Environmental Health Engineering School of Public Health and Center for Environmental Research Medical Science University of Tehran Tehran Iran Department of Environmental Science Faculty of Natural ResourcesUniversity of TehranKarajIran

Environmental impact prediction is an important step in many environmental studies. A wide variety of methods have been developed in this concern. During this study, remote sensing images were used for environmental impact prediction in Ro-batkarim area, Iran, during the years of 2005～2007. It was assumed that environmental impact could be predicted using time series satellite imageries. Natural vegetation cover was chosen as a main environmental element and a case study. Environmental impacts of the regional development on natural vegetation of the area were investigated considering the changes occurred on the extent of natural vegetation cover and the amount of biomass. Vegetation data, land use and land cover classes (as activity factors) within several years were prepared using satellite images. The amount of biomass was measured by Soil-adjusted Vegetation Index (SAVI) and Normalized Difference Vegetation Index (NDVI) based on satellite images. The resulted biomass estimates were tested by the paired samples t-test method. No significant difference was observed between the average biomass of estimated and control samples at the 5% significance level. Finally, regression models were used for the environmental impacts prediction. All obtained regression models for prediction of impacts on natural vegetation cover show values over 0.9 for both correlation coefficient and R-squared. According to the resulted methodology, the prediction models of projects and plans impacts can also be developed for other environmental elements which may be derived using time series remote sensing images.

关键词： Environmental impact Remote sensing Prediction Vegetation Biomass

Essential phospholipids for nonalcoholic fatty liver disease associated with metabolic syndrome: A systematic review and network meta-analysis

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World Journal of Clinical Cases 2020年第21期8卷 5235-5249页

作者： asad Izziddin Dajani Branko Popovic ADSC Medcare Hospital and Saudi German HospitalSharjahAl KhanPO Box 6328United Arab Emirates Sanofi-Aventis Deutschland GmbH CHC Global Medical AffairsFrankfurt am Main 65926Germany

BACKGROUND Essential phospholipids(EPL)are used for the supportive treatment of nonalcoholic fatty liver disease(NAFLD),but data are mostly from small-scale *** To evaluate the efficacy of EPL treatment in adult patients with NAFLD and type 2 diabetes and/or *** The MEDLINE,PubMed,Embase,and Cochrane databases were searched up to March 2019 for clinical trials and comparative observational *** studies were those published in English or Chinese that enrolled adult patients(≥18 years)with NAFLD and type 2 diabetes mellitus and/or obesity receiving EPL as monotherapy or as add-on therapy to existing therapy,and that included at least one of the efficacy outcomes of interest.A variety of studies were identified;thus,direct,indirect and cohort meta-analyses were *** difference(MD)and 95%confidence interval(CI)were calculated for continuous variables,and relative risk with 95%CI for disease response and recovery.A random-effects model was used to address between-study *** Ten studies met the inclusion criteria(n=22-324).EPL treatment duration ranged from 4 to 72 *** the direct meta-analysis(four randomized controlled trials),compared with antidiabetic therapy alone,EPL plus antidiabetic therapy was associated with a significantly greater reduction in[alanine aminotransferase(ALT);MD:11.28 U/L(95%CI:-17.33,-5.23),P=0.0003],triglyceride[MD:-49.33 mg/dL(95%CI:-66.43,-32.23),P<0.0001]and total cholesterol levels[MD:-29.74 mg/dL(95%CI:-38.02,-21.45),P<0.0001].There was also a significant increase in the rate of overall improvement[relative risk 1.50(95%CI:1.26-1.79),P<0.0001],and risk of no disease(P=0.0091),and a reduction in moderate disease(P=0.0187);there were no significant differences in severe disease,mild disease,or significant *** the cohort meta-analysis of three non-randomized clinical trials,the MD in ALT levels was-16.71 U/L(95%CI:-24.94,-8.49)and 23%of patients had improved *** the

关键词： Non-alcoholic fatty liver disease Diabetes Obesity Metabolic syndrome Essential phospholipids Systematic review Meta-analysis