International Journal of Mathematical Engineering and Management Sciences最新文献_第5页

Non-dyadic Haar Wavelet Algorithm for the Approximated Solution of Higher order Integro-Differential Equations 高阶积分微分方程近似解的非二进Haar小波算法

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-07-01 DOI: 10.33889/ijmems.2023.8.4.045

Ratesh Kumar, Sabiha Bakhtawar

{"title":"Non-dyadic Haar Wavelet Algorithm for the Approximated Solution of Higher order Integro-Differential Equations","authors":"Ratesh Kumar, Sabiha Bakhtawar","doi":"10.33889/ijmems.2023.8.4.045","DOIUrl":"https://doi.org/10.33889/ijmems.2023.8.4.045","url":null,"abstract":"The objective of this study is to explore non-dyadic Haar wavelets for higher order integro-differential equations. In this research article, non-dyadic collocation method is introduced by using Haar wavelet for approximating the solution of higher order integrodifferential equations of Volterra and Fredholm type. The highest order derivatives in the integrodifferential equations are approximated by the finite series of non-dyadic Haar wavelet and then lower order derivatives are calculated by the process of integration. The integro-differential equations are reduced to a set of linear algebraic equations using the collocation approach. The Gauss - Jordan method is then used to solve the resulting system of equations. To demonstrate the efficiency and accuracy of the proposed method, numerous illustrative examples are given. Also, the approximated solution produced by the proposed wavelet technique have been compared with those of other approaches. The exact solution is also compared to the approximated solution and presented through tables and graphs. For various numbers of collocation points, different errors are calculated. The outcomes demonstrate the effectiveness of the Haar approach in resolving these equations.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44388260","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

Mérnöktanár-képzés – Taneszközök kiválasztása

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.10.

Rita Nagyné Kondor

引用次数: 0

Component development using Topological Methods 使用拓扑方法进行组件开发

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.6.

Kristóf Szabó

引用次数: 0

Surface Quality of Carbide Metal After Electrical Discharge Machining 电火花加工后硬质合金表面质量的研究

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.4.

Ľ. Straka, P. Kuchta

{"title":"Surface Quality of Carbide Metal After Electrical Discharge Machining","authors":"Ľ. Straka, P. Kuchta","doi":"10.21791/ijems.2023.2.4.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.4.","url":null,"abstract":"Recently, the requirements for machining shape-complex products made of hard-to-machine materials, including carbide, have been increasing significantly. However, their machining is rather problematic. Additionally, a high-quality standard of the machined surface is generally required, not only in terms of roughness but also in terms of the geometric accuracy of the machined surface. All this while maintaining a high level of economy in the machining process. However, meeting these demanding requirements in real technical practice is not always an easy task. Moreover, in combination with modern machining processes, only a limited number of production technologies can meet this requirement. Therefore, due to the high demands placed on today's modern production and the required high standard of the machined surface, progressive EDM technology is increasingly finding its application. And it is through this progressive technology that it is possible to achieve relatively good success in carbide machining. The aim of this paper was therefore to describe in detail the results of an experimental investigation aimed at identifying the quality of the machined surface achieved in terms of the roughness parameters of the machined surface in the electrical discharge machining of selected types of carbides using a wire tool electrode.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86019009","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

Potentiodynamic Study of The Effects of Nickel on The Electrodeposition of Zinc from Chloride Media 镍对氯化物介质电沉积锌影响的电位动力学研究

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.2.

H. Zakiyya, T. Kékesi

{"title":"Potentiodynamic Study of The Effects of Nickel on The Electrodeposition of Zinc from Chloride Media","authors":"H. Zakiyya, T. Kékesi","doi":"10.21791/ijems.2023.2.2.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.2.","url":null,"abstract":"Abstract. The potentiodynamic experiments of the nickel effects on the zinc electrodeposition have been done to understand the impact of Ni impurities on the electrowinning of Zn from spent pickling liquor. The nickel chloride solutions of Ni concentrations 90 and 1 g/dm3 were used as the electrolytes. The latter was also mixed with 90 g/dm3 Zn in the experiments. All the runs were carried out at room temperature with 40 mV/s continuous polarization speed and with 1/s sampling rate. It was observed that nickel electrodeposition from chloride media containing 90 g/dm3 Ni started with the generation of hydrogen bubbles, entirely blocking the cathode surface. Only a slight current development was observed until the polarization potential ~ -0,8 V. The visual observation showed bubbles also formed at the anode, which may represent chlorine and/or oxygen evolution. While, in the electrodeposition of nickel with only 1 g/dm3 Ni concentration in the electrolyte, metal deposition was hardly observed, but visible hydrogen bubbles constantly blocked the cathode surface. A similar tendency was observed in the mixed-solution electrolysis cell; the initial tiny bubbles accumulated at the cathode surface more than in the pure Zn solution. The enhancement of H2 evolution indicates how nickel deposition may contribute to the loss of useful current in the process of Zn electrodeposition. The mass of nickel deposited from the mixed solutions significantly decreases as the Ni concentration decreases in the electrolyte, while the mass of deposited zinc is relatively constant. It means that the purity of the produced Zn is appreciably higher – with respect to Ni – if nickel is efficiently eliminated from the solution before electrowinning.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72782605","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

On the Torsional Rigidity of Orthotropic Beams with Rectangular Cross Section 矩形截面正交各向异性梁的扭转刚度研究

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.3.

A. Baksa, I. Ecsedi, Á. Lengyel, Dávid Gönczi

引用次数: 0

Mixing Power Requirement Determination in Agitated Drum Using Dimensional Analysis 用量纲分析确定搅拌鼓的搅拌功率要求

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.9.

D. Horváth, T. Poós

引用次数: 0

Teaching the Analysis of Newton’s Cooling Model to Engineering Students 对工科学生进行牛顿冷却模型分析教学

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.7.

C. Kézi

引用次数: 0

Ultrasonic Powder Atomization for Additive Manufacturing 用于增材制造的超声粉末雾化

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.8.

David Halapi, L. Varga

引用次数: 0

use of Partial Least Squares to define the Characteristics in the Environment of Higher Education Institutions and their Effects on Entrepreneurial Academic Education, a case study: Torreon, Mexico 利用偏最小二乘法定义高校环境特征及其对创业型学术教育的影响，以墨西哥托雷昂为例

IF 1.6

International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.1.

Karen Miriam González Flores

{"title":"use of Partial Least Squares to define the Characteristics in the Environment of Higher Education Institutions and their Effects on Entrepreneurial Academic Education, a case study: Torreon, Mexico","authors":"Karen Miriam González Flores","doi":"10.21791/ijems.2023.2.1.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.1.","url":null,"abstract":"Because university incubators have a favorable effect on student’s entrepreneurial intents, Higher Education Institutions (HEIs) are essential to the delivery of entrepreneurship education. By analyzing the perceptions of students who received master diploma in management-business fields in Torreon, Mexico in 2021, the aim of the research is to identify the internal and external aspects of the HEI environment and their impact on entrepreneurial education using Partial Least Squares methodology with the help of the SmartPLS software, 156 responses from the statistical tool provided 120 responses. Three of the original hypotheses were confirmed, while four variables—two associated with HEI ecosystem external factors and two with entrepreneurial education elements—had to be removed since they were not accepted. The findings will lead to a better comprehension of the elements influencing master students' entrepreneurial perspective to create stronger relationship with elements of the HEI ecosystem.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78333566","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