检索结果-南通市图书馆

Biodiesel production from green seaweed Ulva fasciata catalyzed by novel waste catalysts from Pakistan Steel Industry

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第8期24卷 1080-1086页

作者： abdul majeed khan Noureen Fatima Muhammad Shoukat Hussain Kousar Yasmeen Research Laboratory of Bioenergy (RLB) Department of Chemistry Federal Urdu University of Arts Science and Technology Gulshan-e-Iqbal Campus

This research article is based on the biodiesel synthesis from the marine green macroalga Ulva fasciata, collected from the coast of Karachi, Pakistan using new and the most potential waste catalysts from Pakistan Steel *** oil was extracted with n-hexane then it was analyzed by GC, TLC and by the examination of fuel *** metal analysis of catalysts was carried out by chemical tests and flame atomic absorption spectroscopy(FAAS). The thermal treatment of catalysts at 1500–1700 °C during various processes in steel manufacturing industry converted the metals to metal oxides. The presence of CaO, MgO and ZnO in these catalysts made them highly reactive for biodiesel synthesis. The basicity of waste industrial catalysts was calculated to know their basic strength. The transesterification of U. fasciata oil was performed by fast stirring using 9:1 molar ratio of methanol/oil in the presence of seven different waste industrial catalysts for 6 h at 80–100 °C. The solid catalysts were easily separated from product for re-use. In addition, the rate of reaction in the presence of these catalysts was found to be quite feasible. The waste brown dust from the steel converter gave the highest yield(88%) of biodiesel. The production of biodiesel was confirmed by TLC examination and fuel properties in comparison with the ASTM standards.

关键词： Ulva fasciata Waste catalysts Thermal treatment Metal oxides and fuel properties

Thermochemical Parameters of 3-Chloroaniline Complexes of Certain Bivalent Transition Metal Bromides

在线全文

学校读者我要写书评

暂无评论

Open Journal of Physical Chemistry 2013年第4期3卷 163-169页

作者： Pedro Oliver Dunstan abdul majeed khan Instituto de Química Universidade Estadual de Campinas Campinas Brazil

Complexes of general formula [MBr2(3-clan)n] (where M is Fe, Ni, Cu or Zn;3-clan = m-chloroaniline;n is 1.5 or 2) were prepared and their characteristic properties, such as capillary MP;C, H, N, Br and metal contents;TG/DTG and DSC curves;and IR and electronic spectra were determined. By calorimetric measurements in solution, the values of some thermodynamic parameters of the complexes were determined. From these values, the standard enthalpies of the metal-nitrogen coordinated bonds were calculated, and the standard enthalpies of the formation of the gaseous phase complexes were estimated.

关键词： Enthalpies of Formation Thermodynamic Coordinated Bond Enthalpies Calorimetric Measurements

Thermal Properties of Se<sub>100–x</sub>Zn<sub>x</sub>Glassy System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2011年第5期2卷 289-298页

作者： Mohd Nasir Mohd abdul majeed khan Mushahid Husain Mohammad Zulfequar 不详

The crystallization process in Se100–xZnx glassy system is investigated using differential scanning calorimeters (DSC). The samples are prepared by conventional melt-quenching technique in the composition range 2 ≤ x ≤ 20 (at%). Non-isothermal measurements are carried out for different heating rates .The value of the glass transition temperature Tg the crystallization temperature Tc and the crystallization peak temperature Tp, are found to be depending upon both heating rate as well as the composition from thermal analytical data. The investigation of crystallization kinetics indicates a single stage crystallization process. The glass transition energy Eg and the crystallization activation energy Ec are also evaluated from thermal analytical data. The analyzer has been used the most reliable non-isothermal kinetic methods. The value of kinetics parameters Eg, Ec and ‘n’ are calculated using non-isothermal kinetics methods. The analysis shows that the incorporation of Zinc content has a strong influence on the crystallization mechanism for the Se100–xZnx glassy system.

关键词： Chalcogenide Glasses Amorphous Crystallization Kinetics DSC Non-Isothermal

Thermal Properties of Se_100–xZn_xGlassy System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ON THE ASYMPTOTIC SPECTRUM OF A TRANSPORT OPERATOR WITH ELASTIC AND INELASTIC COLLISION OPERATORS

Materials Sciences and Applications 2011年第5期

作者： Mohd Nasir Mohd abdul majeed khan Mushahid Husain Mohammad Zulfequar

来源：评论

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2020年第3期40卷 805-823页

作者： abdul-majeed AL-IZERI Khalid LATRACH UniversitéClermont Auvergne CNRSLMBPF-63000 Clermont-FerrandFrance

In this article,we investigate the spectral properties of a class of neutron transport operators involving elastic and inelastic collision operators introduced by Larsen and Zweifel[1].Our analysis is manly focused on the description of the asymptotic spectrum which is very useful in the study of the properties of the solution to Cauchy problem governed by such operators(when it exists).The last section of this work is devoted to the properties of the leading eigenvalue(when it exists).So,we discuss the irreducibility of the semigroups generated by these *** close this section by discussing the strict monotonicity of the leading eigenvalue with respect to the parameters of the operator.

关键词： Compactness properties transport operator abstract boundary conditions asymptotic spectrum irreducibility leading eigenvalue

WELL-POSEDNESS OF A NONLINEAR MODEL OF PROLIFERATING CELL POPULATIONS WITH INHERITED CYCLE LENGTH

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2016年第5期36卷 1225-1244页

作者： abdul-majeed AL-IZERI Khalid LATRACH Université Blaise Pascal(Clermont Ⅱ)Laboratoire de Mathématiques CNRS UMR 6620 Campus des Cézcaux-B.P.80026 63171 Aubière Cedex France

This paper deals with a nonlinear initial boundary values problem derived from a modified version of the so called Lebowitz and Rubinow’s model [16] discussed in [8, 9]modeling a proliferating age structured cell population with inherited properties. We give existence and uniqueness results on appropriate weighted L~p-spaces with 1 ≤ p < ∞ in the case where the rate of cells mortality σ and the transition rate k are depending on the total density of population. General local and nonlocal reproduction rules are considered.

关键词： evolution equation local and nonlocal boundary conditions quasi-accretive operators mild solutions,strong solutions local and global solutions

Road to recompensation:BavenoⅦcriteria and transjugular intrahepatic portosystemic shunt in liver cirrhosis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第32期30卷 3743-3747页

作者： Muhammad Aarish Anis Ammara abdul majeed Shahab Abid Department of Medicine Section of GastroenterologyAga Khan University HospitalSindhKarachi 74800Pakistan

Liver cirrhosis has long been considered a point of no return,with limited hope for ***,recent advancements,particularly the Baveno VII criteria and the utilization of transjugular intrahepatic portosystemic shunt(TIPS),have illuminated the concept of hepatic *** this editorial we comment on the article by Gao et al published in the recent *** editorial provides a comprehensive overview of the evolution of understanding cirrhosis,the criteria for recompensation,and the efficacy of TIPS in achieving *** discuss key findings from recent studies,including the promising outcomes observed in patients who achieved recompensation post-TIPS *** further research is needed to validate these findings and elucidate the mechanisms underlying recompensation,the insights presented here offer renewed hope for patients with decompensated cirrhosis and highlight the potential of TIPS as a therapeutic option in their management.

关键词： Decompensated hepatic cirrhosis Hepatic recompensation Transjugular intrahepatic portosystemic shunt Variceal bleeding Refractory ascites

Specific Capacitance and Cyclic Stability of Graphene Based Metal/Metal Oxide Nanocomposites:A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第7期31卷 699-707页

作者： abdul Waheed Anwar abdul majeed Nadeem Iqbal Wasi Ullah Ahmad Shuaib Usman Ilyas Fozia Bibi Hafiz Muhammad Rafique Nanotechnologies Research Centre Department of PhysicsUniversity of Engineering and Technology Under Graduate Block/School of Physical Sciences University of the Punjab Department of Physics University of the Punjab

Graphene has become a worldwide admired material among researchers and scientists equally due to its unique richness in mechanical strength, electrical conductivity, optical and thermal properties. Re- searchers have explored that the composite materials based on graphene and metal/metal oxide nanostructures possess excellent potential for energy storage technologies. In particular, supercapacitors based on such composite materials have engrossed the extreme interest of researchers for its rapid charging/discharging time, safe operation and longer cyclic constancy. Till now, several fabrication techniques for composite materials and their energy storage applications have been explored. Here, specially, we have concentrated on the hottest research progress for the fabrication of graphene oxide and metal/metal oxide nanocomposites. We also emphasized on the characteristics and properties of supercapacitors fabricated using these composite materials. Moreover, our study is focused on the specific capacitance and cyclic stability of various composites to haul out the most efficient material for supercapacitor applications.

关键词： GrapheneMetal/metal oxide nanostructureSupercapacitor

Supervised Machine Learning-Based Prediction of COVID-19

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第10期69卷 21-34页

作者： Atta-ur-Rahman Kiran Sultan Iftikhar Naseer Rizwan majeed Dhiaa Musleh Mohammed abdul Salam Gollapalli Sghaier Chabani Nehad Ibrahim Shahan Yamin Siddiqui Muhammad Adnan khan Department of Computer Science College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia Department of Computer Information System College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia Department of CIT Faculty of Applied StudiesKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Computer Science&Information Technology Superior UniversityLahore54000Pakistan Directorate of IT The Islamia University of BahawalpurBahawalpur63100Pakistan School of Computer Science National College of Business Administration and EconomicsLahore54000Pakistan Department of Computer Science Minhaj University LahoreLahore54000Pakistan Department of Computer Science Faculty of ComputingRiphah International University Lahore CampusLahore54000Pakistan

COVID-19 turned out to be an infectious and life-threatening viral disease,and its swift and overwhelming spread has become one of the greatest challenges for the *** yet,no satisfactory vaccine or medication has been developed that could guarantee its mitigation,though several efforts and trials are *** around the globe are striving to overcome the COVID-19 spread and while they are finding out ways for early detection and timely *** this regard,healthcare experts,researchers and scientists have delved into the investigation of existing as well as new *** situation demands development of a clinical decision support system to equip the medical staff ways to timely detect this *** state-of-the-art research in Artificial intelligence(AI),Machine learning(ML)and cloud computing have encouraged healthcare experts to find effective detection *** study aims to provide a comprehensive review of the role of AI&ML in investigating prediction techniques for the COVID-19.A mathematical model has been formulated to analyze and detect its potential *** proposed model is a cloud-based smart detection algorithm using support vector machine(CSDC-SVM)with cross-fold validation *** experimental results have achieved an accuracy of 98.4%with 15-fold cross-validation *** comparison with similar state-of-the-art methods reveals that the proposed CSDC-SVM model possesses better accuracy and efficiency.

关键词： COVID-19 CSDC-SVM artificial intelligence machine learning cloud computing support vector machine