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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":"41 1","pages":""},"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":"12 1","pages":""},"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
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
{"title":"Mixing Power Requirement Determination in Agitated Drum Using Dimensional Analysis","authors":"D. Horváth, T. Poós","doi":"10.21791/ijems.2023.2.9.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.9.","url":null,"abstract":"The mixing of granular materials in an agitated drum can be characterized by the dimensionless power equation. The equation was created by dimensional analysis, for which the parameters affecting the mixing power requirement were collected based on the literature. The most important of these are the rotational speed, the drum loading factor, the geometric and physical properties of the mixing drum and the granular materials.  The dimensionless power equation is used to estimate with reasonable accuracy the Power number within the given range of applicability , which has been validated by measurements. From the Power number, the mixing power requirement of the mixed granular material can be calculated, which can be used as operational data for selecting the mixing motor.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"75 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90786722","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
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
{"title":"Teaching the Analysis of Newton’s Cooling Model to Engineering Students","authors":"C. Kézi","doi":"10.21791/ijems.2023.2.7.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.7.","url":null,"abstract":"To apply mathematical methods to physical or other real life problem, we have to formulate the problem in mathematical terms. It means that, we have to construct the mathematical model for the problem. Many physical problems shows the relationships between changing quantities. The rates of change are represented mathematically by derivatives. In this case the mathematical models involve equations relating an unknown function and one or more of its derivatives. These equations are the differential equations. In this article, teaching the analysis of Newton's cooling model to engineering students is presented as one of the applications of separable differential equations.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"33 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81680700","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
{"title":"On the Torsional Rigidity of Orthotropic Beams with Rectangular Cross Section","authors":"A. Baksa, I. Ecsedi, Á. Lengyel, Dávid Gönczi","doi":"10.21791/ijems.2023.2.3.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.3.","url":null,"abstract":"The paper deals with the torsional rigidity of homogenous and orthotropic beam with rectangular crosssection. The torsional rigidity of the considered beam is defined in the framework of the Saint-Venant theory ofuniform torsion. Exact and approximate solutions are given to the determination of the torsional rigidity. The shapeof cross section is determined which gives maximum value of the torsional rigidity for a given cross-sectional area.The dependence of torsional rigidity as a function of the ratio shear moduli of beam is also studied.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"6 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88964475","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
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
{"title":"Ultrasonic Powder Atomization for Additive Manufacturing","authors":"David Halapi, L. Varga","doi":"10.21791/ijems.2023.2.8.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.8.","url":null,"abstract":"The following article presents a special case of metal powder production, ultrasonic metal atomization. In this case, ultrasound technology is based on the capillary wave phenomenon. We verify the suitability of the produced powders for 3D metal printing with various tests. In the case of prints with a metal powder bed fusion (PBF), the properties of the raw material of the powder are extremely important. The main results of the tests carried out in the article (SEM images, EDS composition analysis, sieve analysis) were described.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"53 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86698390","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
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":"93 1","pages":""},"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
Közösségi média marketing stratégia elemzése – különböző szinten versenyző kézilabda klubok vizsgálatán keresztül
IF 1.6
International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-30 DOI: 10.21791/ijems.2023.2.5.
Ákos Pethő, C. Pfau
{"title":"Közösségi média marketing stratégia elemzése – különböző szinten versenyző kézilabda klubok vizsgálatán keresztül","authors":"Ákos Pethő, C. Pfau","doi":"10.21791/ijems.2023.2.5.","DOIUrl":"https://doi.org/10.21791/ijems.2023.2.5.","url":null,"abstract":"Magyarországon kiemelt figyelmet és támogatottságot élvez a kézilabda, ez nem csupán hazánkra, hanem Európára is igaz, valamint egyre nagyobb teret hódít magának világszerte is a sportág. Az elmúlt két évtized egyik legnagyobb újdonsága minden a közösségi média, ami megreformálta az információ átadással és a hagyományos marketing tevékenységgel kapcsolatos alap stratégiákat. Ezeken a platformokon gyökeresen változtak meg a tartalomgyártás folyamatai, amire minden sportklubnak érdemes figyelmet fordítania, hiszen jelentős előnyökhöz juthatnak mind gazdasági-, marketing-, közösségépítés terén egyaránt, ha képesek jól kommunikálni. Három egymástól eltérő szinten versenyző sportklub került összehasonlításra kvalitatív vizsgálat során a közösségi média marketing stratégia tevékenységüket tekintve, amelyek név szerint a PICK Szeged, a Balatonfüredi KSE – BFKA Balatonfüred és a DEAC kézilabda csapata. Ezen vizsgálati modellnek az alapkoncepciója arra épült fel, hogy a különböző szinteken, különböző sportszakmai célokért küzdő klubcsapatok online marketingkommunikációs tevékenysége miben tér el egymástól, valamint mik azok a fejlődési lehetőségek, szempontok, amivel lehető leghatékonyabban lehet érvényesülni a social média felületeken. A kézilabda klubcsapatok több kutatási kérdésben is egyetértettek, de felfedezhető volt jelentős különbség is egy-egy területen, amiben a közösségi médiáért felelős szakemberek nem értettek egyet, vagy más nézőpontot képviseltek. Eredményeimet tekintve megállapítható, hogy egy sikeres online marketing stratégia mögött mindig komoly előkészületi és tervező munka áll, valamint a tartalomgyártás diverzifikálása kulcsfontosságú a különböző felületeken, mert a platformok fogyasztói közössége is eltérő egymástól.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"12 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85466977","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 Situational Based Reliability Indices Estimation of ULT Freezer using Preventive Maintenance under Fuzzy Environment 模糊环境下基于情景的ULT冷冻库预防性维修可靠性指标估计
IF 1.6
International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-01 DOI: 10.33889/ijmems.2023.8.3.027
P. Dhiman, Amit Kumar
{"title":"A Situational Based Reliability Indices Estimation of ULT Freezer using Preventive Maintenance under Fuzzy Environment","authors":"P. Dhiman, Amit Kumar","doi":"10.33889/ijmems.2023.8.3.027","DOIUrl":"https://doi.org/10.33889/ijmems.2023.8.3.027","url":null,"abstract":"Reliability of high demand machines is quite necessary and it can be maintained through proper and timely maintenance, Ultra-low temperature (ULT) freezer is one of those kinds of machines which are in high demand during covid-19 pandemic for the storage of vaccine. The rapid production of vaccines for the prevention of coronavirus disease 2019 (COVID-19) is a worldwide requirement. Now the next challenge is to store the vaccine in a ULT freezer. It’s become really a big problem to store the vaccine which creates the demand of ULT freezer. The present paper investigates a situational based performance of the ULT freezer with the aim to predict the impact of different component failures as well as human errors on the final performance of the same. For the study, it is not possible to extract the parameters (failure rate and repair time) of the components that never failed before. Thus, to overcome this difficulty, here authors use the possibility theory. Authors present the available data in Right triangular fuzzy number with some tolerance as suggested by system analyst. The lambda-tau methodology and arithmetic operations on right triangular generalized fuzzy numbers (RTrFN) are used to find the various performance parameters namely MTTF, MTTR, MTBF, reliability, availability, maintainability (RAM) and ENOF, under fuzzy environment. The proposed model has been studied using possibility theory under working conditions, preventive maintenance as well as under the rest of conditions. This study reveals the most and least critical component of the ULT freezer which helps maintenance department to plan the maintenance strategy accordingly.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46047026","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
Novel Solution for Time-fractional Klein-Gordon Equation with Different Applications 不同应用的时间分数阶Klein-Gordon方程新解
IF 1.6
International Journal of Mathematical Engineering and Management Sciences Pub Date : 2023-06-01 DOI: 10.33889/ijmems.2023.8.3.030
{"title":"Novel Solution for Time-fractional Klein-Gordon Equation with Different Applications","authors":"","doi":"10.33889/ijmems.2023.8.3.030","DOIUrl":"https://doi.org/10.33889/ijmems.2023.8.3.030","url":null,"abstract":"In this paper, for the first time, the Laplace Homotopy Perturbation Method (LHPM), which is the coupling of the Laplace transform and the Homotopy Perturbation Method, is employed to solve non-linear time-fractional Klein-Gordon (TFKG) equations. In other words, for the first time in literature, LHPM is used to solve non-linear TFKG equations. First of all, the procedure of LHPM on TFKG with Caputo fractional derivative is developed. Further, the developed approach of LHPM on TFKG is used for two different examples. This in turn proves the versatile nature of the proposed method. In addition, the validity of the approach is proved by comparing the numerical solutions of both examples with their exact solution. Finally, the comparison of relative errors calculated in each example proves the efficiency and effectiveness of the proposed method on TFKG equations.","PeriodicalId":44185,"journal":{"name":"International Journal of Mathematical Engineering and Management Sciences","volume":"1 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69510710","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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