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Sustainable pathways to ammonia: a comprehensive review of green production approaches

CLEAN ENERGY 2024年第2期8卷 60-72页

作者： Ahmed, Hafiz Sharjeel Yahya, Zaid Khan, waqar ali Faraz, ali Univ Engn & Technol UET Lahore Pakistan NFC Inst Engn & Fertilizer Res Chem Engn Dept Faislabad Pakistan Univ Punjab Chem Engn Dept Lahore Pakistan

Ammonia production is vital in global industries but faces increasing environmental concerns, necessitating a shift towards sustainable methods. This review comprehensively explores diverse hydrogen production approaches and their potential impact on sustainable ammonia synthesis. The primary focus is investigating hydrogen production methods that enhance both efficiency and sustainability in ammonia synthesis, which is crucial for reducing its environmental footprint. Furthermore, the review highlights the pivotal role of catalysts in improving Faradaic efficiency in ammonia synthesis, emphasizing their significance in overall process efficiency. The study identifies innovative technologies that have the potential to revolutionize ammonia production while aligning with global sustainability goals. Through a thorough examination of hydrogen production methods and catalytic advances, this review provides valuable insight into greener and more efficient ammonia production practices. In conclusion, it emphasizes the importance of exploring hydrogen production methods and leveraging catalysts to improve ammonia production sustainability and efficiency. It addresses a critical research gap and paves the way for an environmentally responsible and globally aligned ammonia production industry. Hydrogen production methods that enhance both efficiency and sustainability in ammonia synthesis are reviewed, highlighting the pivotal role of catalysts in improving Faradaic efficiency in ammonia synthesis. It addresses a critical research gap and paves the way for an environmentally responsible and globally aligned ammonia production industry. Graphical Abstract

关键词： ammonia production green alternatives sustainability catalyst ELECTROCATALYTIC N-2 REDUCTION ELECTROCHEMICAL SYNTHESIS NITROGEN ELECTROSYNTHESIS CATALYSTS CARRIER WATER

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A mathematical model for open pit mine production scheduling with Grade Engineering and stockpiling

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International Journal of Mining Science and Technology 2021年第4期31卷 717-728页

作者： Karo Fathollahzadeh Elham Mardaneh Mehmet Cigla Mohammad waqar ali Asad Western Australian School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityKalgoorlie 6430Australia School of Electrical Engineering Computing and Mathematical SciencesCurtin UniversityPerth 6845Australia

This paper presents the development and implementation of an innovative mixed integer programming based mathematical model for an open pit mining operation with Grade Engineering *** Engineering comprises a range of coarse-separation based pre-processing techniques that separate the desirable(***-grade)and undesirable(***-grade or uneconomic)materials and ensure the delivery of only selected quantity of high quality(or high-grade)material to energy,water,and cost-intensive processing *** model maximizes the net present value under a range of operational and processing *** that the proposed model is computationally complex,the authors employ a data preprocessing procedure and then evaluate the performance of the model at several practical instances using computation time,optimality gap,and the net present value as valid *** addition,a comparison of the proposed and traditional(without Grade Engineering)models reflects that the proposed model outperforms the traditional formulation.

关键词： Mine planning Grade Engineering Optimization Scheduling Stockpiling Exact methods

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Designing an optimal stope layout for underground mining based on a heuristic algorithm

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International Journal of Mining Science and Technology 2015年第5期25卷 767-772页

作者： Sandanayake Don Suneth Sameera Topal Erkan Asad Mohammad waqar ali Mining Engineering Western Australian School of MinesCurtin University

An optimal layout or three-dimensional spatial distribution of stopes guarantees the maximum profitability over life span of an underground mining ***,stope optimization is one of the key areas in underground mine planning ***,the computational complexity in developing an optimal stope layout has been a reason for limited availability of the algorithms offering solution to this *** article shares a new and efficient heuristic algorithm that considers a three-dimensional ore body model as an input,maximizes the economic value,and satisfies the physical mining and geotechnical constraints for generating an optimal stope *** implementation at a copper deposit demonstrates the applicability and robustness of the algorithm.A parallel processing based modification improving the performance of the original algorithm in terms of enormous computational time saving is also presented.

关键词： Stope optimization Underground mining Underground mine planning Heuristic algorithm

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Experimental Study on Heat Storage Properties Comparison of Paraffin/Metal Foams Phase Change Material Composites

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Journal of Thermal Science 2024年第2期33卷 469-478页

作者： waqar AHMED Abid HUSSAIN Hanzla SHAHID Imran ali Hafiz Muhammad ali Department of Mechanical Engineering University of Engineering and TechnologyTaxila47080Pakistan Department of Mechanical Engineering Institute of Space TechnologyIslamabadPakistan Department of Mechanical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Heat storage properties of phase change materials(PCMs) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCMs can be improved by developing metal foam/PCM *** addition of metal foam in PCMs has a significant effect on the thermal characteristics of *** this paper,the heat storage properties of two different metal foam/PCM composites were experimentally *** behavior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant heat flux of 1000 W/m^(2) in three directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials which resulted in enhancing the thermal conductivity of the paraffin.A comparative analysis is made on the heat storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during the phase transition process is experimentally *** comparison indicates that temperature uniformity in copper foam/paraffin composite is better than in iron-nickel foam/paraffin composite and pure paraffin at the same heat *** results show that at heat flux of 1000 W/m^(2),the heat storage time for copper foam/paraffin composite is 20.63% of that of iron-nickel foam/paraffin composite.

关键词： heat storage capacity paraffin/metal foam composite temperature uniformity heat storage rate phase transition process

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Context-Aware Collaborative Filtering Framework for Rating Prediction Based on Novel Similarity Estimation

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Computers, Materials & Continua 2020年第5期63卷 1065-1078页

作者： waqar ali Salah Ud Din Abdullah Aman Khan Saifullah Tumrani Xiaochen Wang Jie Shao School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Faculty of Information Technology The University of LahoreLahore54000Pakistan Sichuan Artificial Intelligence Research Institute Yibin644000China

Recommender systems are rapidly transforming the digital world into intelligent information *** valuable context information associated with the users’prior transactions has played a vital role in determining the user preferences for items or rating *** has been a hot research topic in collaborative filtering-based recommender systems for the last two *** paper presents a novel Context Based Rating Prediction(CBRP)model with a unique similarity scoring estimation *** proposed algorithm computes a context score for each candidate user to construct a similarity pool for the given subject user-item pair and intuitively choose the highly influential users to forecast the item *** context scoring strategy has an inherent capability to incorporate multiple conditional factors to filter down the most relevant *** with traditional similarity estimation methods,CBRP makes it possible for the full use of neighboring collaborators’choice on various *** conduct experiments on three publicly available datasets to evaluate our proposed method with random user-item pairs and got considerable improvement in prediction accuracy over the standard evaluation ***,we evaluate prediction accuracy for every user-item pair in the system and the results show that our proposed framework has outperformed existing methods.

关键词： Recommender system context-based similarity estimation rating prediction collaborative filtering

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上下文感知推荐系统：挑战和机遇（英文）

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电子科技大学学报 2019年第5期48卷 655-673页

作者： ali waqar 邵杰 KHAN Abdullah Aman TUMRANI Saifullah 电子科技大学计算机科学与工程学院成都611731 拉合尔大学信息技术学院拉合尔巴基斯坦54000

该文梳理了社会和科学领域中上下文感知推荐系统的主要概念、技术、挑战和未来趋势;其次,分类介绍了可用于基于上下文的推荐的一系列技术和主要框架。除了经典的基于内容、基于协同过滤和基于矩阵分解的技术之外,调研了最近的研究方向,... 详细信息

该文梳理了社会和科学领域中上下文感知推荐系统的主要概念、技术、挑战和未来趋势;其次,分类介绍了可用于基于上下文的推荐的一系列技术和主要框架。除了经典的基于内容、基于协同过滤和基于矩阵分解的技术之外,调研了最近的研究方向,即基于深度学习和基于模糊逻辑的方法。最后,描述了在推荐过程中利用上下文信息的潜在研究机会。

关键词：推荐系统上下文感知上下文获取上下文整合

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基于超级电容和蓄电池的AC孤岛模式微网综合储能系统控制策略

基于超级电容和蓄电池的AC孤岛模式微网综合储能系统控制策略

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作者： ali waqar 华北电力大学(北京)

学位级别：硕士

未来的发电系统将比传统的集中式系统更分散,这需要容纳更多的分布式发电(DG)和可再生能源。这将使电力网络更复杂,需要更高效的、可靠的配电系统和管理系统。分布式发电也对主电网的效率和电能质量有不利影响。一个典型的低压微电网包... 详细信息

未来的发电系统将比传统的集中式系统更分散,这需要容纳更多的分布式发电(DG)和可再生能源。这将使电力网络更复杂,需要更高效的、可靠的配电系统和管理系统。分布式发电也对主电网的效率和电能质量有不利影响。一个典型的低压微电网包括分布式发电单元、可再生能源、智能储能、住宅和小型商业负载以及能源管理系统。微电网通常可以在两种模式下运行,即孤岛模式(无主电网)和并网模式。这种低压微电网主要用在主电网无法到达的偏远地区或在主电网故障的情况下作为备用系统。这类型的电网对于可再生能源和储能系统的依赖很强。由于可再生能源的间歇性和电网的薄弱性,能源管理在边远地区微电网中十分重要。传统的储能方式并不是最优的,需要进一步的研究和改进。为解决这一问题,本文重点研究了由电池储能装置和柴油发电机支撑的孤岛模式运行的交流微电网中的运行系统策略和相应的能源管理方法。像电池组这样的储能装置在转移负荷和平滑功率变化的能源管理中起着重要作用。但是由于电池储能系统价格昂贵以及维护和运输等问题,无法在平滑功率脉动方面批量使用。为了解决这个问题,本文提出了一种结合电池和超级电容器的混合储能(HES)方案。这个混合储能系统将会负责转移负荷和平滑功率变化。

关键词：柴油发电机微网超级电容孤岛可再生能源

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Soil erosion susceptibility mapping of Hangu Region,Kohat Plateau of Pakistan using GIS and RS-based models

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Journal of Mountain Science 2024年第8期21卷 2547-2561页

作者： Fakhrul ISLAM Liaqat ali WASEEM Tehmina BIBI waqar AHMAD Muhammad SADIQ Matee ULLAH Walid SOUFAN Aqil TARIQ Department of Geology Khushal Khan Khattak UniversityKarak 27200Pakistan Department of Geography Government College University FaisalabadPunjab 38000Pakistan Institute of Geology The University of Azad Jammu&KashmirMuzaffarabad 13100Pakistan Department of Earth Sciences Changan UniversityXi’an 710003China NCEG University of PeshawarPeshawar 25120Pakistan Faculty of Earth Sciences Geography and AstronomyUniversity of ViennaVienna 1090Austria Plant Production Department College of Food and Agriculture SciencesKing Saud UniversityRiyadh 11451Saudi Arabia Department of Wildlife Fisheries and AquacultureCollege of Forest ResourcesMississippi State UniversityMS 39762USA

Soil erosion is a crucial geo-environmental hazard worldwide that affects water quality and agriculture,decreases reservoir storage capacity due to sedimentation,and increases the danger of flooding and ***,this study uses geospatial modeling to produce soil erosion susceptibility maps(SESM)for the Hangu region,Khyber Pakhtunkhwa(KPK),*** Hangu region,located in the Kohat Plateau of KPK,Pakistan,is particularly susceptible to soil erosion due to its unique geomorphological and climatic ***,the Hangu region is characterized by a combination of steep slopes,variable rainfall patterns,diverse land use,and distinct soil types,all of which contribute to the complexity and severity of soil erosion *** factors necessitate a detailed and region-specific study to develop effective soil conservation *** this research,we detected and mapped 1013 soil erosion points and prepared 12 predisposing factors(elevation,aspect,slope,Normalized Differentiate Vegetation Index(NDVI),drainage network,curvature,Land Use Land Cover(LULC),rainfall,lithology,contour,soil texture,and road network)of soil erosion using GIS ***,GIS-based statistical models like the weight of evidence(WOE)and frequency ratio(FR)were applied to produce the SESM for the study *** SESM was reclassified into four classes,i.e.,low,medium,high,and very high *** results of WOE for SESM show that 16.39%,33.02%,29.27%,and 21.30%of areas are covered by low,medium,high,and very high zones,*** contrast,the FR results revealed that 16.50%,24.33%,35.55%,and 23.59%of the areas are occupied by low,medium,high,and very high ***,the reliability of applied models was evaluated using the Area Under Curve(AUC)*** validation results utilizing the area under curve showed that the success rate curve(SRC)and predicted rate curve(PRC)for WOE are 82%and 86%,respectively,while SRC and PRC for FR are 85%and 96%,res

关键词： Soil erosion Geospatial technology Statistical models Hangu Pakistan

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附生及溶剂协同作用对聚3-己基噻吩结构及性能的影响

附生及溶剂协同作用对聚3-己基噻吩结构及性能的影响

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作者： waqar ali MEMON（瓦卡尔）北京化工大学

学位级别：硕士

取向的有机半导体材料具有很多优异的特性,如高效的电荷传输性能以及各向异性的发射和吸收特性。通过溶液加工的方法以及利用取向聚合物基底进行附生结晶的手段得到各向异性的导电聚合物薄膜。我们发现,P3HT/PCBM在取向聚乙烯(PE)基底... 详细信息

取向的有机半导体材料具有很多优异的特性,如高效的电荷传输性能以及各向异性的发射和吸收特性。通过溶液加工的方法以及利用取向聚合物基底进行附生结晶的手段得到各向异性的导电聚合物薄膜。我们发现,P3HT/PCBM在取向聚乙烯(PE)基底上的附生晶体结构受所使用溶剂沸点的影响。使用高沸点溶剂邻二氯苯(o-DCB)所配置P3HT溶液时,P3HT在PE上形成c轴与PE的c轴平行的side-on和face-on结构。当使用低沸点溶剂氯仿时,晶体的两种取向结构并不理想。此外,PCBM的添加不影响P3HT的附生结晶行为。而且取向PE基底也可诱导PCBM形成各向异性结构。PE基底有效地增加了 P3HT的face-on晶体含量,face-on晶体与side-on晶体的比例为PSS:PEDOT基底上的7倍。这种取向晶体结构产生了各向异性的紫外吸收和荧光。其中使用邻二氯苯做溶剂时其各向异性比可以达到2。P3HT和P3HT/PCBM膜的光致发光极化比(IVH/Ivv)是约为2,表明其可以很好地应用于偏振发光器件。使用掠入射X射线衍射技术(GIXRD)研究溶剂类型及厚度对P3HT在高取向PE薄膜的附生结晶结构的影响。在使用GIXRD时,分别得到入射X射线平行于PE分子链方向的衍射结果和入射X射线束垂直于PE的c轴方向的衍射结果,从而获得了薄膜内的晶体结构取向信息。P3HT薄膜的厚度在18 nm到95 nm之间变化。结果表明,使用两种溶剂在高度取向的PE基底上得到的P3HT厚膜均得到P3HT的c轴平行于PE拉伸方向的face-on和side-on片晶,使用氯仿溶液得到的薄膜具有更多的face-on结构,相比之下,邻二氯苯溶剂挥发后,P3HT在取向的PE基底上具有更多的side-on结构。对于薄膜的厚度而言,两种溶剂的薄膜的face-on结构均随着厚度的降低而减少,其中,使用邻二氯苯溶剂制备的更薄的样品几乎全为side-on结构,表明在PE诱导使其获得取向结构的同时其有序度也大幅度提高。除此之外,紫外吸收光谱表明了,随着厚度的减小,两种溶剂得到的P3HT薄膜也显示出更好的各向异性,这在使用o-DCB作为溶剂时表现得更加明显,其二向色性比从1.975增加至4.2,而使用CHC13作为溶剂时,二向色性比则无明显改变。

关键词：导电聚合物各向异性结构溶剂影响厚度附生结晶

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Modeling and Analysis of SO<sub>2</sub>Emissions under Fast Fluidized Bed Conditions Using One Dimensional Model

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Advances in Chemical Engineering and Science 2014年第3期4卷 327-338页

作者： Khurram Shahzad Mahmood Saleem Moinuddin Ghauri waqar ali Khan Niaz Ahmed Akhtar Centre for Coal Technology University of the Punjab Lahore Pakistan Department of Chemical Engineering Comsats Institute of IT Lahore Pakistan Institute of Chemical Engineering & Technology University of the Punjab Lahore Pakistan NFC-IEFR Faisalabad Pakistan

Fluidized bed combustion behavior of coal and biomass is of practical interest due to its significant involvement in heating systems and power plant operations. This combustion behavior has been studied by many experimental techniques along with different kinetic models. In this study, SO2 emissions have been studied out in a pilot scale test facility of Circulating Fluidized Bed combustor (70 KW) under fast fluidized bed conditions burning coal with Pakistani wheat straw. One dimensional Mathematical model is being developed to predict the SO2 emissions under different operating conditions like bed temperature, Ca/S molar ratio, solids circulation rate, excess air ratio and secondary to primary air ratio. These parameters are varied to validate the model and encouraging correlation is found between the experimental values and model predictions.

关键词： Fast Fluidization Emissions Modelling

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