NUST Journal of Engineering Sciences最新文献

Investigating Ground subsidence due to Secret Mining and Repairing Damaged Structures 调查秘密采矿造成的地面沉降和修复受损结构

NUST Journal of Engineering Sciences Pub Date : 2023-12-24 DOI: 10.24949/njes.v16i2.754

Abdul Jabbar Khan, Syed Ali Rizwan, Muzna Anam, Zafar Mahmood

引用次数: 0

Structural Analysis & Shape Optimization for a Control Arm of a Vehicle’s Suspension. 汽车悬架控制臂的结构分析与形状优化。

NUST Journal of Engineering Sciences Pub Date : 2023-12-24 DOI: 10.24949/njes.v16i2.746

Abdul Rehman Ahmad, Mian Muhammad, Asim Zahir

引用次数: 0

Structural Properties of Mn Doped ZnO Nanocrystallites Using Wet Chemical Synthesis 湿法合成Mn掺杂ZnO纳米晶的结构特性

NUST Journal of Engineering Sciences Pub Date : 2023-06-30 DOI: 10.24949/njes.v16i1.756

Nii Abekah Akwetey Armah, Huvert Azoda Koffi

{"title":"Structural Properties of Mn Doped ZnO Nanocrystallites Using Wet Chemical Synthesis","authors":"Nii Abekah Akwetey Armah, Huvert Azoda Koffi","doi":"10.24949/njes.v16i1.756","DOIUrl":"https://doi.org/10.24949/njes.v16i1.756","url":null,"abstract":"To get the required electrical, magnetic, structural and optical properties, materials are required to be doped with suitable impurities. The use of transition metals as a dopant in ZnO has been investigated to determine how they alter the various properties. Several research concerning the synthesis of TM-doped ZnO via various methods with the solubility limit of TM elements in ZnO has been reported. The distribution of the TMs into the ZnO matrix has been reported with divergent views. In this work, Mn doped ZnO nanoparticles has been synthesized by means of reasonable and ecologically friendly procedure by means of the liquid phase method with fewer conservational contaminants and no leftover products. The influence of the dopant on the structural properties of the produced ZnO nanocrystals was scrutinized using powder x-ray diffractogram (XRD). The Mn-doping concentration, x, was varied ( ) at temperatures of 180°C and 200 °C. Results of the lattice parameters, bond length, bond angles, crystallite size, strain, volume of unit cell, APF, number of unit cells, specific surface area and the density of the Mn-doped ZnO nanocrystal samples were be irregular in nature and not following a particular trend as the doping concentration increases. This variation in the values were due to the irregular values of the interplanar spacing and the observed variations in the shift of the peak angles as a result of the difference in ionic radii between Zn and Mn ions with Mn having multiple ionic radii since all the parameters are directly dependent on the value of the 2θ.","PeriodicalId":338631,"journal":{"name":"NUST Journal of Engineering Sciences","volume":"361 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132343936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catalytic Reduction of Carbon dioxide to Methanol as a Fuel, A Mini Review 二氧化碳催化还原制甲醇燃料的研究进展

NUST Journal of Engineering Sciences Pub Date : 2023-06-30 DOI: 10.24949/njes.v16i1.766

Osama Rabi, Erum Pervaiz, Tasmia Azam

引用次数: 0

Structural Optimization of Metallic Toroid using Finite Element Method 金属环面结构的有限元优化

NUST Journal of Engineering Sciences Pub Date : 2023-06-30 DOI: 10.24949/njes.v16i1.734

Zaigham Saeed Toor, Ahsan Abdul Rauf

{"title":"Structural Optimization of Metallic Toroid using Finite Element Method","authors":"Zaigham Saeed Toor, Ahsan Abdul Rauf","doi":"10.24949/njes.v16i1.734","DOIUrl":"https://doi.org/10.24949/njes.v16i1.734","url":null,"abstract":"This research paper has used a three-dimensional approach that combines Finite Element Analysis, the famous three-factor Design of Experiments by Taguchi, with the third dimension. An idea to optimize a Lithium (Li) and Lead (Pb) based Toroid is presented as they are known hazardous materials. The approach emphasized generating different run orders by a parametric variation of outer diameter, thickness, and base metal on the minimum and maximum specifications. Based on the Design of Experiments, the calculated run orders were modelled and simulated under the specified loading conditions to select the best combination of parameters. The analytical stresses generated in the combinations were compared with the numerical counterparts for model validation. On-Mises stress and deformation results from the simulation were analyzed to select the optimized design of Toroid structure and the final shape was modelled accordingly. The analytical and numerical stresses also showed good agreement with each other, supporting the validity of the presented approach. The method effectively models such specimens before fabrication, so that all material and geometric aspects can be finalized before risking physical contact with the actual worker.","PeriodicalId":338631,"journal":{"name":"NUST Journal of Engineering Sciences","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133986014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantifying the Influences of Land Use and Rainfall Dynamics on Probable Flood Hazard Zoning 量化土地利用和降雨动态对洪水灾害分区的影响

NUST Journal of Engineering Sciences Pub Date : 2023-06-30 DOI: 10.24949/njes.v16i1.739

Nabi Rehman, Umar Zada, Kashif Haleem

{"title":"Quantifying the Influences of Land Use and Rainfall Dynamics on Probable Flood Hazard Zoning","authors":"Nabi Rehman, Umar Zada, Kashif Haleem","doi":"10.24949/njes.v16i1.739","DOIUrl":"https://doi.org/10.24949/njes.v16i1.739","url":null,"abstract":"Flooding is Pakistan's most common natural hazard, and it is exacerbated by increased rainfall and urbanization. Khyber Pakhtunkhwa (KPK), Pakistan flood-prone zones were determined by superimposing six flood parameters in an ArcGIS environment: elevation, slope, rainfall accumulation, land cover, soil geometry, and gap/buffer from water channel. Cellular automata based on artificial neural network (CA-ANN) along QGIS plugin module of Land Use Change Simulations (MOLUSCE) was used for predicting year 2050 land use, with a kappa value of 0.83. The results indicated that of the 75775 km2 land area covered by this research region, 3.37% (2553.62 km2) falls in extremely high risk, 18.44% (13972.91 km2) falls in high risk, 11.26% (8532.27 km2) falls in moderate risk, 0.51% (386.45 km2) falls in low risk, and just 66.42% (50329.76 km2) falls in very low risk areas. In KPK, like in any other place, a multi-criteria flood risk-vulnerability assessment is consequently necessary for preparation and post-hazard planning. Without a doubt, the outcomes reported here are crucial for flood risk assessments and hazard management decision-making. \u0000Key words: natural disasters; floods; remote sensing; geographic information system, multi-criteria evaluation; weighted overlay. \u0000 ","PeriodicalId":338631,"journal":{"name":"NUST Journal of Engineering Sciences","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134521837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of experimental and numerical analysis on laser beam machining of composites and thermoplastics 激光加工复合材料和热塑性塑料的实验与数值分析综述

NUST Journal of Engineering Sciences Pub Date : 2023-03-20 DOI: 10.24949/njes.v16i1.748

K. Moghadasi, K. F. Tamrin, F. Mahmud, Marzie Hatef Jalil

引用次数: 0

A Step by Step Analytical Solution to the Single Diode Model of a Solar Cell 太阳能电池单二极管模型的逐级解析解

NUST Journal of Engineering Sciences Pub Date : 2022-12-31 DOI: 10.24949/njes.v15i2.728

Azoda Hubert Koffi, Esau Abeka Armah, Koffi Ampomah-Benefo, D. Dodoo‐Arhin

引用次数: 0

Performance and Emission Characteristics of SI Engine Running With Gasoline, Blends of Ethanol and Blends of Ethiopian Arekie 使用汽油、乙醇混合物和埃塞俄比亚阿雷基混合物的SI发动机的性能和排放特性

NUST Journal of Engineering Sciences Pub Date : 2022-12-31 DOI: 10.24949/njes.v15i2.713

Mengistu Gizaw Gawo, Dr. Bisrat Yosef Gebremichael

{"title":"Performance and Emission Characteristics of SI Engine Running With Gasoline, Blends of Ethanol and Blends of Ethiopian Arekie","authors":"Mengistu Gizaw Gawo, Dr. Bisrat Yosef Gebremichael","doi":"10.24949/njes.v15i2.713","DOIUrl":"https://doi.org/10.24949/njes.v15i2.713","url":null,"abstract":"Petroleum fuels have become a threat to the world because of their toxic emissions. Besides, it is unknown how long they will last. The only known fact is that they are depleting rapidly and will not last long. So the world’s concern about finding environmentally friendly alternative fuels has increased recently. Hence alcohol fuels are found to be the most convenient alternatives to use in internal combustion engines. This research intends to introduce Ethiopian locally produced alcohol as an alternative in the blended form with gasoline to use in spark ignition engines. The traditionally distilled Arekie was purchased from a local producer and purified using fractional distillation. Then five Arekie-gasoline blends were prepared with the proportion of 5,10,15,20, and 25%v/v (A5,A10,A15,A20, and A25, respectively). Also, absolute ethanol was purchased from a local supplier, and ethanol-gasoline blends were prepared with a similar proportion as Arekie-gasoline blends (E5,E10,E15,E20, and E25). Then an experiment was conducted on a single cylinder, 4-stroke, spark-ignition engine running at a constant speed of 2500 rpm and variable loads to investigate the performance and emission characteristics. Results showed that the performance and emission parameters are significantly improved as the ratio of Arekie and ethanol in gasoline increases at all loads. Among all tested fuels, E20 exhibited better performance, and E25 Exhibited better emission. A20 provided a slightly lower performance than E20 but much improved compared to pure gasoline. A25 provided comparable emissions with E25 and was much better than pure gasoline. Generally, adding up to 20%v/v Ethiopian Arekie in gasoline could make a better, renewable alternative to spark ignition engines","PeriodicalId":338631,"journal":{"name":"NUST Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122771880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research Progress on Powder Injection Molding in Malaysia-A Review 粉末注射成型技术在马来西亚的研究进展

NUST Journal of Engineering Sciences Pub Date : 2022-12-31 DOI: 10.24949/njes.v15i2.720

F. Ahmad, M. Raza, M. Aslam, Ali Sameer Mohsin, I. Sherazi, Abqaat Naseer, Muhammad Ali, C.A. Shahed, A. Raza

{"title":"Research Progress on Powder Injection Molding in Malaysia-A Review","authors":"F. Ahmad, M. Raza, M. Aslam, Ali Sameer Mohsin, I. Sherazi, Abqaat Naseer, Muhammad Ali, C.A. Shahed, A. Raza","doi":"10.24949/njes.v15i2.720","DOIUrl":"https://doi.org/10.24949/njes.v15i2.720","url":null,"abstract":"In this era, parts complexity, dimensional accuracy, and cost-effectiveness are one of thebasic requirements of the modern industry. Most of the conventional manufacturingtechniques have failed to fulfill the industry’s needs. Powder injection molding (PIM) startedin the early 70s, which is a combination of powder metallurgy and plastic injection moldingthat fulfills the gaps in conventional manufacturing techniques. In Malaysia, PIM wasintroduced by SIRIM Sdn Bhd Malaysia in late 2000. The latter few universities startedworking on PIM. Among all universities, the Advanced Functional Materials Research(AFM) group at Universiti Teknologi PETRONAS (UTP) started to work in 2008 under thedirection of Prof. F. Ahmad and was decided to target various industries and their latestrequirements. The work completed during the past 11 years has been published in varioushigh-quality international journals, secure intellectual property (IP), i.e., trademarks, patents,a pre-commercialization grant from the government, one commercialization agreement, andsigned a technology licensing agreement. They also worked on carbon Nanotube reinforcedcopper nanocomposite for thermal management and secured two patents. This project wascommercialized for heat sink materials for LED Lights. The group is also working oncontrolling the orientation of fibers in the metal matrix to enhance thermal conductivity.Moreover, grafting graphene on metal oxide for its potential use as a radiation shieldingmaterial is one of the noble works. Currently, the group is working on the fabrication of softmagnetic material with enhanced permeability for potential use in hearing Aids, electricmotors, and several other applications. Besides, bio-medical parts like a dental screw, biomedical material of 316L SS reinforced by nano Titanium and additive manufacturing byusing ultra-fused BASF 316L SS parts made through FDM represent the scope of works inPIM.","PeriodicalId":338631,"journal":{"name":"NUST Journal of Engineering Sciences","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125277746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0