IF 0.3

TECCIENCIA Pub Date : 2023-02-02 DOI: 10.18180/tecciencia.2022.34.2

J. Useche, Belman Jahir Rodríguez, Andrés Felipe Guevara, Jhoan Sebastián Romero, Marcelo Herrera Martínez, L. Hermida

引用次数: 0

Analysis of the influence of air quality on the performance of the Boeing 737-800 evaluated during takeoff at El Dorado Airport 分析在埃尔多拉多机场起飞时空气质量对波音737-800性能的影响

IF 0.3

TECCIENCIA Pub Date : 2023-02-02 DOI: 10.18180/tecciencia.2022.34.3

J. Lugo, Santiago Marcelo Reina, Nicolás Martínez, Ruben Salazar, Jesus Vega, Luis Longas

{"title":"Analysis of the influence of air quality on the performance of the Boeing 737-800 evaluated during takeoff at El Dorado Airport","authors":"J. Lugo, Santiago Marcelo Reina, Nicolás Martínez, Ruben Salazar, Jesus Vega, Luis Longas","doi":"10.18180/tecciencia.2022.34.3","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.34.3","url":null,"abstract":"This paper analyzes how the Bogotá’s air quality and pollutant levels affects the Boeing 737-800 take-off performance in terms of the available runway distances and maximum newtext{take-off} weight, which are two of the most restrictive factors in airlines' operation. The airport runway's physical characteristics, geographical position, surroundings, and atmospheric conditions affect the maximum aircraft newtext{take-off} weight. This study examines: (a) the influence of pollutants in Bogotá’s air quality and its subsequent effects in air density; (b) the maximum available polluting agents and relative humidity measures in this city; (c) the maximum take-off weight of the aircraft with and without air degradation due to atmospheric considerations. Software called “Aircraft Take-Off Software” has been developed to determine the B737-800 most limiting take-off weight of in specific geographical and atmospheric conditions. This study reflects the effect of high populated cities pollution on the aircraft operational performance which analysis has demonstrated that the presence of high carbon dioxide concentrations in the air increase the B737-800 payload capacity taking off from Bogotá but in the other hand, relative humidity variation decreases this capacity drastically, showing that considering Bogotá’s relative humidity and pollutant levels, the most restrictive weight situation for the take-off phase is the “Climb Limit Take-Off Weight”; however, as it is an aerodynamic study of the pollutants influence in engine combustion the structural integrity was not considered and for further investigation it should be considered to determine more accurately the most restrictive take-off weight.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47193317","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

Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst 不同比例Co3O4纳米颗粒对(ORR/OER)双功能Co3O4/α-MnO2电催化剂行为的影响

IF 0.3

TECCIENCIA Pub Date : 2023-02-02 DOI: 10.18180/tecciencia.2023.34.4

Awan Zahoor, Ghadia Ahmed, M. Amir, Faaz Butt Butt, Asad A. Naqvi

{"title":"Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst","authors":"Awan Zahoor, Ghadia Ahmed, M. Amir, Faaz Butt Butt, Asad A. Naqvi","doi":"10.18180/tecciencia.2023.34.4","DOIUrl":"https://doi.org/10.18180/tecciencia.2023.34.4","url":null,"abstract":"Among all type of batteries, Lithium Air Batteries (LAB) are considered to be the most effective due to their highest energy density of around 11900 Wh/kg but there are some major issues are being faced by LAB such as large overpotential, poor cycle life, low current density, and decreased energy efficiency. The solution to these issues is primarily dependent on the proper selection of an electrocatalyst. A new approach for using a bi-functional electrocatalyst produced excellent results. Here, Co3O4/α-MnO2 composite has been considered as a bifunctional catalyst because cobalt oxide performed well in the Oxygen Evolution Reaction (OER) process while manganese oxide performed well in the Oxygen Reduction Reaction (ORR) process. A simple two-step hydrothermal process is used in this work to synthesize Co3O4/α-MnO2. This work focuses on the behavior of the composite electrocatalyst when varying percentages of Cobalt oxide (5%, 10%, 15%, and 20%) are deposited on the alpha-Manganese Oxide nanorods. The primary characteristics of each sample with different percentages of Cobalt Oxide are examined, and the performance of each sample is compared to one another. Several testing techniques like Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) are performed on the samples. The combination of cobalt oxide and manganese oxide showed a synergistic effect and work as a bifunctional electrocatalyst. As the percentage of Co3O4 deposited on the α-MnO2 nanorod increased, it behaves more like an OER electrocatalyst leading to a decrease in charging potential. This work will help in finding an optimum amount of Co3O4 that should be deposited on α-MnO2 nanorods to get an efficient (ORR/OER) bifunctional electrocatalyst.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46705294","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

Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst 不同比例Co3O4纳米颗粒对(ORR/OER)双功能Co3O4/α-MnO2电催化剂行为的影响

TECCIENCIA Pub Date : 2023-02-02 DOI: 10.18180/tecciencia.2022.34.4

Awan Zahoor, Ghadia Ahmed, Muhammad Amir, Faaz Butt Butt, as Naqvi

{"title":"Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst","authors":"Awan Zahoor, Ghadia Ahmed, Muhammad Amir, Faaz Butt Butt, as Naqvi","doi":"10.18180/tecciencia.2022.34.4","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.34.4","url":null,"abstract":"Among all type of batteries, Lithium Air Batteries (LAB) are considered to be the most effective due to their highest energy density of around 11900 Wh/kg but there are some major issues are being faced by LAB such as large overpotential, poor cycle life, low current density, and decreased energy efficiency. The solution to these issues is primarily dependent on the proper selection of an electrocatalyst. A new approach for using a bi-functional electrocatalyst produced excellent results. Here, Co3O4/α-MnO2 composite has been considered as a bifunctional catalyst because cobalt oxide performed well in the Oxygen Evolution Reaction (OER) process while manganese oxide performed well in the Oxygen Reduction Reaction (ORR) process. A simple two-step hydrothermal process is used in this work to synthesize Co3O4/α-MnO2. This work focuses on the behavior of the composite electrocatalyst when varying percentages of Cobalt oxide (5%, 10%, 15%, and 20%) are deposited on the alpha-Manganese Oxide nanorods. The primary characteristics of each sample with different percentages of Cobalt Oxide are examined, and the performance of each sample is compared to one another. Several testing techniques like Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) are performed on the samples. The combination of cobalt oxide and manganese oxide showed a synergistic effect and work as a bifunctional electrocatalyst. As the percentage of Co3O4 deposited on the α-MnO2 nanorod increased, it behaves more like an OER electrocatalyst leading to a decrease in charging potential. This work will help in finding an optimum amount of Co3O4 that should be deposited on α-MnO2 nanorods to get an efficient (ORR/OER) bifunctional electrocatalyst.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135360309","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

Mobile Ad-Hoc network, Mobile application, aircraft performance, software development 移动自组网，移动应用，飞机性能，软件开发

IF 0.3

TECCIENCIA Pub Date : 2023-01-01 DOI: 10.18180/tecciencia.2023.34.1

Amber Israr, Zain ANWAR ALI, Muhammad Salman Pathan, Rana J aved Masood

引用次数: 0

Finite Element Analysis of Composite Pressure Vessel Using Reduced Models 复合材料压力容器的简化模型有限元分析

IF 0.3

TECCIENCIA Pub Date : 2022-12-12 DOI: 10.18180/tecciencia.2022.33.5

J. Jadoon, A. Shazad, Muhammad Muzamil, M. Akhtar, Mohsin Sattar

{"title":"Finite Element Analysis of Composite Pressure Vessel Using Reduced Models","authors":"J. Jadoon, A. Shazad, Muhammad Muzamil, M. Akhtar, Mohsin Sattar","doi":"10.18180/tecciencia.2022.33.5","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.33.5","url":null,"abstract":"Pressure vessels are one of the essential industrial tools for high-pressure containments. Catastrophic failure of pressure vessels is detrimental to society. It is essential to design pressure vessels by selecting high-strength materials and analyzing them beyond working loads to ensure safety. Liner less composite cylinders have gained importance in the pressure vessel industry owing to their high strength-to-weight ratios, corrosion resistance, etc. However accurate and efficient prediction of their mechanical properties was required. Finite element methods were employed for the structural analysis of reduced models. The three-dimensional shell structure of the Graphite/Epoxy composite system was analyzed using APDL. Appropriate boundary conditions were applied to 5x reduced models internally pressurized to 20 MPa. Suitable mesh size was selected through mesh independence and stress distributions were discussed for reduced models, especially for the inner two layers. Comparison with previous research confirmed the validity of the models. 0.1° rotated strip of the vessel gives accurate and conservative results. Tsai Wu, Tsai Hill, Maximum Shear Stress (Smax), and Von Mises were used to assess the failure of composite cylinders. Each of the failure criteria predicts the failure of the second layer for all the reduced models.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44823011","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: 1

Suitable Site Selection for Ocean Thermal Energy Conversion (OTEC) systems – A case study for Pakistan 海洋热能转换（OTEC）系统的合适选址——以巴基斯坦为例

IF 0.3

TECCIENCIA Pub Date : 2022-10-10 DOI: 10.18180/tecciencia.2022.33.4

Talha Bin Nadeem, Asad A. Naqvi, Ahsan Ahmed

引用次数: 3

Growth and cooperation of Latin American Countries: The role of industrial knowledge 拉丁美洲国家的增长与合作:工业知识的作用

IF 0.3

TECCIENCIA Pub Date : 2022-08-16 DOI: 10.18180/tecciencia.2022.33.2

Gesny Yadira Baquero Cruz, Greys M. Florez Torres, G. Hanappi

{"title":"Growth and cooperation of Latin American Countries: The role of industrial knowledge","authors":"Gesny Yadira Baquero Cruz, Greys M. Florez Torres, G. Hanappi","doi":"10.18180/tecciencia.2022.33.2","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.33.2","url":null,"abstract":"A direct comparison of the welfare implications of pure competition between the states of Latin America and the outcome of a cooperative set of actions of these states is not possible. Laboratory experiments in the social sciences are impossible; societies experience just one run through history. Nevertheless, a concise study of the performance of a specific tool of cooperation, namely the Industrial Knowledge Bank (IKB), can be performed. If over time, such a tool attracts more and more countries, which formerly relied on competitive forces only, then an indirect proof of the superiority of cooperation can be assumed. The industrial knowledge is exchanged via specified projects, which form a network in the IKB data-bank. Then, the evolution of the structure of this network mimics the growth of the actual cooperative industrial projects. This paper provides a brief history and description of this institutional attempt to increase cooperation. It also shows the most relevant bottlenecks met by this project. Further, a clear picture of the state of industrial cooperation across South America is studied in detail through the development of the nodes of this network. We then use two indices typical for welfare increase to compare Latin American countries being part of the cooperation with those not taking part. The visible correlation can be interpreted as a hint of the advantages of cooperation. In conclusion, we provide some possible future scenarios for further industrial development in Latin America based on the study of this Industrial Knowledge Bank.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42436637","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

An effective and simplified method to select the working fluid for waste heat recovery based Organic Rankine Cycle 基于废热回收的有机朗肯循环工质选择的一种有效简化方法

IF 0.3

TECCIENCIA Pub Date : 2022-08-08 DOI: 10.18180/tecciencia.2022.33.3

Asad A. Naqvi, Ahsan Ahmed, T. Nadeem, M. Talha, Muhammad Hamza Tariq, M. Siddiqui, Rayyan Ahmed Abbasi

{"title":"An effective and simplified method to select the working fluid for waste heat recovery based Organic Rankine Cycle","authors":"Asad A. Naqvi, Ahsan Ahmed, T. Nadeem, M. Talha, Muhammad Hamza Tariq, M. Siddiqui, Rayyan Ahmed Abbasi","doi":"10.18180/tecciencia.2022.33.3","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.33.3","url":null,"abstract":"Organic Rankine Cycle (ORC) is an attractive option to utilize the low-grade waste heat for power generation. The selection of working fluid for ORC is a challenging task because of environmental constraints as most of the organic fluids has the capacity to damage the environment. In this research, a method for the selection of an optimum working fluid for the operation low grade waste heat is determined. The selection of the optimum working fluids depends upon the thermal efficiency, Global Warming Potential (GWP), Ozone Depletion Potential (ODP) and Atmospheric Lifetime of the fluid. Twelve different organic fluids including R134a, butene, R22, R152a, R245fa, R290, R161a, isobutene, isobutane, dimethyl ether, R600 and R124 are selected for the study. The ORC is analyzed by using EES at 2 MPa, 2.5 MPa and 3 MPa. The thermal efficiency of ORC is determined and is found that high operating pressure is favorable for the operation of ORC. At 2.5 MPa, the top three working fluids are R-245fa, R-600 and Iso-butene with an efficiency of 12.7%, 12% and 11.3% respectively. On the basis of thermal efficiency, R-245fa is the best but it has the highest GWP and atmospheric life of 1050 and 7.7 years. R-600 has GWP and atmospheric life of just 20 and 0.018 years. On the basis of environmental constraints, R-600 is found to be more beneficial than R-245fa. It is concluded that R-600 is the optimum working fluid for the operation of low-grade waste heat ORC.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44663486","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: 1

Network evolution in theory and as observed, the case of the Industrial Knowledge Bank of Latin America 理论上的网络演变和所观察到的网络演变，以拉丁美洲工业知识银行为例

IF 0.3

TECCIENCIA Pub Date : 2022-06-25 DOI: 10.18180/tecciencia.2022.32.7

Gesny Yadira Baquero Cruz, Greys M. Florez Torres, G. Hanappi

{"title":"Network evolution in theory and as observed, the case of the Industrial Knowledge Bank of Latin America","authors":"Gesny Yadira Baquero Cruz, Greys M. Florez Torres, G. Hanappi","doi":"10.18180/tecciencia.2022.32.7","DOIUrl":"https://doi.org/10.18180/tecciencia.2022.32.7","url":null,"abstract":"This paper provides an evaluation of a theoretical approach of network theory that describes network evolution by comparing it to an observed evolution of an industrial cooperation network connecting different countries. The theoretical approach considered is the well-known preferential attachment mechanism leading to power-law distributions developed by Albert Barabási. The empirical phenomenon studied is the evolution of the Industrial Knowledge Bank (IKB) maintained by The United Nations Industrial Development Organization (UNIDO). By fitting a discrete power law to the empirical data collected during the 4 years of operation of the IKB project and testing the goodness-of-fit using the bootstrapping procedure, it is shown that the theoretical framework in its most elementary form is adequate to grasp the essential features of the observed case. The comparison also leads to an improved understanding of very influential social factors like language and geographical distance, thus can give valuable insight for the further theoretical advances in theoretical work on network evolution and its applications to Social, Industrial, and Economic Development.","PeriodicalId":22331,"journal":{"name":"TECCIENCIA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46409294","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

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