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Detailed investigation of optimized alkali catalyzed transesterification of Jatropha oil for biodiesel production

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Journal of Energy Chemistry 2015年第3期24卷 331-336页

作者： Waqas Ahmed Muhammad Faizan Nazar syed danish ali Usman ali Rana Salah Ud-Din Khan National Centre for Physics Quaid-i-Azam University Campus Office of Research Innovation and CommercializationUniversity of Gujrat Department of Chemistry University of Gujrat Sustainable Energy Technologies (SET) Center College of EngineeringPO-Box 800King Saud University

The non-edible oils are believed to be one of the major feedstock for the production of biodiesel in *** the present study,we investigated the production of Jatropha oil methyl esters（JOMEs） via alkali-catalyzed transesterification *** biophysical characteristics of Jatropha oil were found within the optimal range in accordance with ASTM standards as a substitute diesel *** chemical composition and production yield of as-synthesized biodiesel were confirmed by various analytical techniques such as FT-IR,1H NMR,13 C NMR and gas chromatography coupled with mass spectrometry.A high percentage conversion,～96.09%,of fatty acids into esters was achieved under optimized transesterification conditions with 6 ：1 oil to methanol ratio and 0.9 wt% Na OH for 50 min at ～60°***,twelve fatty acids methyl esters（FAME） were quantified in the GC/MS analysis and it was interesting to note that the mass fragmentation pattern of saturated,monounsaturated and diunsaturated FAME was comparable with the literature reported values.

关键词： Jatropha oil methyl esters transesterification biodiesel fuel gas chromatography mass spectrometry

Polymer-free electrospun separator film comprising silica nanofibers and alumina nanoparticles for Li-ion full cell

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Journal of Energy Chemistry 2020年第3期29卷 217-226页

作者： syed danish ali Zaidi Chong Wanga Qinjun Shao Jing Gao Shengdong Zhu Haifeng Yuan Jian Chen Advanced Rechargeable Batteries Laboratory Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023LiaoningChina University of Chinese Academy of Science Beijing 100039China

A separator film for high-performance Li-ion batteries was prepared by electrospinning. The film had a hybrid morphology of silica nanofibers(SNFs) and alumina nanoparticles(ANPs), with a smooth surface, polymer-free composition, high porosity(79%), high electrolyte uptake(876%), and excellent thermal stability. Contact angle measurements demonstrated the better immersion capability of the SNF-ANP separator film for commercial liquid electrolytes than a commercial CELGARD 2500 separator film. Moreover,compared to the commercial CELGARD 2500 separator, the ionic conductivity of the SNF-ANP separator film was nearly three times higher, the bulk resistance was lower at elevated temperature(120 ℃), the interfacial resistance with lithium metal was lower, and the electrochemical window was wider. Full cells were fabricated to determine the cell performance at room temperature. The specific capacity of the full cell with the SNF-ANP separator film was 165 mAh g-1;the cell was stable for 100 charge/discharge cycles and exhibited a capacity retention of 99.9%. Notably, the electrospun SNF-ANP separator film can be safely used in Li-ion or Li-S rechargeable batteries.

关键词： Electrospun nanofiber Hybrid materials Separator film Silica nanofiber Li-ion batteries

Incorporation of layered tin(Ⅳ) phosphate in graphene framework for high performance lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第2期30卷 99-108,I0004页

作者： Haifeng Yuan Na Zhang Leiwu Tian Lei Xu Qinjun Shao syed danish ali Zaidi Jianping Xiao Jian Chen Advanced Rechargeable Battery Laboratory Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences.Beijing 100049 China

To anchor the polysulfide and enhance the conversion kinetics of polysulfide to disulfide/sulfide is critical for improving the performance of lithium-sulfur *** this purpose,the graphene-supported tin(Ⅳ) phosphate(Sn(HPO_4)_2·H_2 O,SnP) composites(SnP-G) are employed as the novel sulfur hosts in this *** compared to the graphene-sulfur and carbon-sulfur composites,the SnP-G-sulfur composites exhibit much better cycling performance at 1.0 C over 800 ***,the pouch cell fabricated with the SnP-G-sulfur cathodes also exhibits excellent performance with an initial capacity of1266.6 mAh g^(-1)(S) and capacity retention of 76.9% after 100 cycles at 0.1 *** adsorption tests,density functional theory(DFT) calculations in combination with physical cha racterizations and electrochemical measurements provide insights into the mechanism of capture-accelerated conversion mechanism of polysulfide at the surface of *** calculations indicate that the Li-O bond formed between Li atom(from Li_2 S_n,n=1,2,4,6,8) and O atom(from PO_3-OH in SnP) is the main reason for the strong interactions between Li_2 S_n and *** a result,SnP can effectively restrain the shuttle effect and improving the cycling performance of Li-S *** addition,by employing the climbing-image nudged elastic band(ciNEB) methods,the energy barrier for lithium sulfide decomposition(charging reaction) on SnP is proved to decrease significantly compared to that on *** can be concluded that SnP is an effective sulfur hosts acting as dual-functional accelerators for the conversion reactions of polysulfude to sulfide(discharging reaction) as well as polysulfide to sulfur(charging reaction).

关键词： Lithium-sulfur battery Tin(Ⅳ)phosphate Dual-functional accelerator Sulfur host Density functional theory calculations

Unraveling the therapeutic mechanisms of myristic acid and luteolin 7-rutinoside in oral cancer: insights from network pharmacology and molecular docking analysis

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Pharmacology Discovery 2024年第2期4卷 1-9页

作者： Ansari Vikhar danish Ahmad Misba Ruhi syed Ayaz ali Qazi Yasar Mohd.Mukhtar Khan Subur W Khan Mohammed Imran Anees Y.B.Chavan College of Pharmacy Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431001India Maulana Azad College Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431001India

Background:The compound Luteolin-7-rutinoside(L7R)is a flavone derivative of luteolin,predominantly identified in plant species belonging to the families ***,Myristic acid is characterized by its structure as a 14-carbon,unsaturated fatty *** this investigation,we endeavor to elucidate the putative mechanisms underlying the therapeutic effects of Myristic Acid and Luteolin 7-rutinoside in the context of oral cancer treatment,employing network pharmacology coupled with molecular docking ***:The protein targets of Myristic Acid and Luteolin 7-rutinoside were identified through a search on the Swiss Target ***,a compound-target network was constructed using Cytoscape *** associated with OC were retrieved from the OMIM and GeneCards *** overlap between compound targets and OC-related targets was determined,and the resulting shared targets were subjected to protein-protein interaction(PPI)network analysis using the STRING ***,gene ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)enrichment analyses were conducted on the identified *** docking were performed to investigate the interactions between the core target and the active ***:The component target network comprises 103 nodes and 102 *** the proteins in the protein-protein interaction(PPI)network,those with higher degrees are TNF,PPARG,and *** through Gene Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathways indicates that the treatment of OC with Myristic Acid and Luteolin 7-rutinoside primarily involves the regulation of miRNA transcription and inflammatory *** identified signaling pathways include Pathways in cancer,PPAR signaling pathway,EGFR signaling pathway,and TNF signaling *** docking studies reveal that Luteolin 7-rutinoside and Myristic acid exhibit higher affinity towards TNF,PPARG,TP53,and ***:This study

关键词： myristic acid luteolin 7-rutinoside network pharmacology oral cancer molecular docking

COMPARISON OF TWO METHODS TO INCREASE TIP CLEARANCE AND ITS EFFECT ON PERFORMANCE OF TURBOCHARGER CENTRIFUGAL COMPRESSOR STAGE

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Chinese Journal of Mechanical Engineering 2007年第4期20卷 60-65页

作者： syed Noman danish School of Mechanical and Vehicular Engineering Beijing Institute of TechnologyBeijing 100081China

Tip clearance between the blade tip and casing of a centrifugal compressor can be varied through two methods： by changing the blade height （MI） or by changing the casing diameter （M2）. Numerical simulations are carried out to compare these two methods and their effect on the stage and impeller performance. The impeller and diffuser are connected through rotor stator boundary using frozen rotor approach. Overall stage performance and the flow configuration have been investigated for nine tip clearance levels from no gap to 1 mm. Impeller and diffuser performances are also presented separately. It has been found that the overall and impeller performance are comparatively better for MI below tip clearance of 0.5 mm whereas M2 is found advantageous above 0.5 mm of tip clearance. Both MI and M2 show performance degradation with the increase in tip clearance. Two models have been proposed for the stage total pressure ratio and efficiency, which are found to be in agreement with experimental results. The impeller efficiency and the pressure ratio are found to be maximum at tip clearance of 0.1 mm for both the cases however minimum diffuser effectiveness is also observed at the same clearance level. Diffuser effectiveness is found to be maximum at zero gap for both cases. As it is practically impossible to have zero gap for unshrouded impellers so it is concluded that the optimum thickness is 0.5 mm onwards for MI and 0.5 mm for M2 in terms of diffuser effectiveness. Mass averaged flow parameters, entropy, blade loading diagram and relative pressure fields are presented, showing the loss production within the impeller passage with tip clearance.

关键词： Centrifugal impeller Diffuser Stage Tip clearance Numerical simulation Entropy

Network pharmacology and computational analysis of berberine and kuwanon Z as possible natural antiviral compounds in COVID-19

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Pharmacology Discovery 2024年第1期4卷 31-43页

作者： Ansari Vikhar danish Ahmad Qazi Yasar Subur W Khan syed Ayaz ali Ansari Altamash Mohd Mukhtar Khan Nikhil S Sakle y.2.chavan college of pharmacy dr.babasaheb ambedkar marathwada universityaurangabad 431001india

Background:Global efforts to discover effective therapeutic agents for combating coronavirus disease 19(COVID-19)have intensified the exploration of natural compounds with potential antiviral *** this study,we utilized network pharmacology and computational analysis to investigate the antiviral effects of Berberine and Kuwanon Z against severe acute respiratory syndrome coronavirus 2,the viruses responsible for ***:Utilizing comprehensive network pharmacology approaches,we elucidated the complex interactions between these compounds and the host biological system,highlighting their multitarget *** pharmacology identifies COVID-19 targets and compounds through integrated protein‒protein interaction and KEGG pathway *** docking simulation studies were performed to assess the binding affinities and structural interactions of Berberine and Kuwanon Z with key viral proteins,shedding light on their potential inhibitory effects on viral replication and ***:Network-based analyses revealed the modulation of crucial pathways involved in the host antiviral ***-target network analysis revealed complex interactions(122 nodes,121 edges),with significant interactions and an average node degree of *** analysis revealed pathways such as the COVID-19 pathway,chemokines and Jak-sat in *** studies revealed that Kuwanon Z had binding energies of-10.5 kcal/mol for JAK2 and-8.1 kcal/mol for the main ***:The findings of this study contribute to the understanding of the pharmacological actions of Berberine and Kuwanon Z in the context of COVID-19,providing a basis for further experimental *** natural compounds exhibit promise as potential antiviral agents,offering a foundation for the development of novel therapeutic strategies in the ongoing battle against the global pandemic.

关键词： COVID-19 kuwanon Z berberine network pharmacology SARS-CoV-2 molecular docking

Waste heat recovery from heavy-duty diesel engine exhaust gases by medium temperature ORC system

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Science China(Technological Sciences) 2011年第10期54卷 2746-2753页

作者： WEI MingShan FANG JinLi MA ChaoChen danish syed Noman School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China National University of Sciences and Technology (NUST) Islamabad H-12 Pakistan

A medium-temperature waste-heat recovery system based on the organic Rankine cycle (ORC) is designed to recover the exhaust energy from a heavy-duty diesel engine. Analysis of the 1st law of thermodynamics for an ORC system is performed. This analysis contains two parts. The first part is an analysis with undefined heat exchangers to gain an understanding of the ORC and find out suitable organic fluid parameters for a better ORC efficiency. The second part of the analysis uses combined engine test results and two designs of heat exchangers. By comparing the two designs, an improved system of heat exchangers is described. This analysis also quantifies the effect of engine parameters on ORC system. The study concludes that the supercritical Rankine cycle is a better approach towards waste heat recovery. The ORC system is found to perform better under part-load conditions if the medium-high power condition rather than rated working point of the engine is used as the design parameter. The ORC system achieves the highest waste-heat recovery efficiency of up to 10-15% for the optimised heat ex-changer design.

关键词： waste heat recovery organic-fluid Rankine cycle heavy-duty diesel engine medium temperature waste heat

Modeling and Performance Simulation of an Innovative Concept of Linear Fresnel Reflector based CSP System

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Journal of Thermal Science 2021年第5期30卷 1614-1624页

作者： danish syed Noman ALMUTAIRI Zeyad EL-LEATHY Abdelrahman AL-ANSARY Hany JARDAN Yazeed ALAQEL Shaker Sustainable Energy Technologies Center King Saud UniversityP.O.Box 800Riyadh11421Saudi Arabia K.A.CARE Energy Research and Innovation Center at Riyadh RiyadhSaudi Arabia Mechanical Engineering Department King Saud UniversityP.O.Box 800Riyadh11421Saudi Arabia Mechanical Power Engineering Department Faculty of EngineeringEl-MatariaHelwan UniversityCairo11718Egypt

Concentrating solar power technology is one of the most promising alternative energy *** recent past,Linear Fresnel Reflector systems have received great attention and novel designs have been proposed keeping in view the objective to enhance its functionality and *** achieving the same objective,this study presents a novel concept where a conventional LFR is enclosed in a greenhouse called *** was expected that such an enclosure can:(1)increase the incoming solar radiation,(2)further improve the overall efficiency due to simplified cleaning process and(3)reduce the capital cost for the construction of LFR support system.A complete thermal and optical analysis was presented for modeling and performance evaluation of the solar field of both conventional-LFR and novel *** of non-linear equations for each system were solved using Newton-Raphson *** detailed optical analysis was further performed for conventional-LFR considering the seasonal *** results concluded that the greenhouse-LFR is better than the conventional-LFR as it had higher efficiency and useful heat with lesser heat *** greenhouse-LFR,the maximum thermal efficiency was 73.2%whereas for conventional-LFR it was 37.2%.Also,there was an average increase of useful heat by 3 times in the month of February and 4.7 times in the month of ***^(TM) analysis indicated significant spillage loss when a conventional-LFR was used without a secondary reflector or slight curvature of the mirrors.

关键词： solar energy concentrated solar power linear Fresnel reflector greenhouse thermal and optical analysis experimentation

Burnout amongst radiologists:A bibliometric study from 1993 to 2020

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World Journal of Psychiatry 2022年第2期12卷 368-378页

作者： Muhammad Fazal Hussain Qureshi danish Mohammad syed Mustafa ali Shah Mahira Lakhani Muzna Shah Muhammad Hassan Ayub Sara Sadiq Medical College Ziauddin UniversityKarachi 75000SindhPakistan Department of Physiology CMH Institute of Medical SciencesBahawalpur 75000Pakistan

BACKGROUND Burnout amongst radiologists is common in many different institutions and is increasing day by *** battle burnout,we have to address the root causes already recognized in published ***,it is crucial to examine and discern important *** To provide evidence-based data and trends related to burnout in radiologists so that researchers can work on it further and develop preventive strategies to overcome this *** Bibliometric analysis conducted by two independent reviewers separately used Scopus Library for data extraction by using medical subject heading and International Classification of Diseases ***-nine articles were selected for analysis after an extensive *** Package for the Social Sciences version 20 was used for *** correlation coefficient,Kruskal Wallis test,and Mann-Whitney U test were *** The most productive period with regards to the number of publications was between 2017 and 2019.A total of 160 authors contributed to the topic burnout among radiologists,with an average of 3.26 authors per *** 41.68%of the authors were female,whilst 35%of them were first *** co-citation analysis by author involved 188 cited authors,13 of whom were cited at least 70 *** six out of forty-nine studies were funded by various government institutions and non-governmental *** Current analysis casts a spotlight on important trends being witnessed in regard to the mental health of radiologists,including lack of funding for mental health research,narrowing of female vs male citation gap,as well as authorship and citation trends.

关键词： Bibliometric Analysis Burnout Radiologist Stress Scientometrics