INCAS Bulletin最新文献_第4页

Oil displacement in capillary tubes using viscoelastic fluids 利用粘弹性流体实现毛细管中的石油位移

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.19

I. Rasuceanu, C. Patrascu, Corneliu Balan

引用次数: 0

The Curie effect incorporation in the monodomain equation describing the action potential dynamics in cardiac tissue 居里效应纳入描述心脏组织动作电位动态的单域方程

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.3

A. Balint, S. Balint, A. Neculae

{"title":"The Curie effect incorporation in the monodomain equation describing the action potential dynamics in cardiac tissue","authors":"A. Balint, S. Balint, A. Neculae","doi":"10.13111/2066-8201.2023.15.4.3","DOIUrl":"https://doi.org/10.13111/2066-8201.2023.15.4.3","url":null,"abstract":"In their in-depth study on cardiac tissue modeling, Clayton and Panfilov [1] present several monodomain or bidomain approaches for the mathematical description of the cardiac tissue action potential dynamics. For simulation of wave propagation in the cardiac tissue, the monodomain descriptions which use integer order derivatives reproduce many of the phenomena that are observed experimentally and are thus an appropriate analysis tool. The main objection concerning the monodomain approaches is that the electrical circuit capacitor, appearing in these descriptions, is considered ideal (the space between the capacitor plates is vacuum) and the Curie effect is ignored. The Curie effect consists of the fact that in case of a dielectric material, if at a moment of time a constant external voltage is applied, due to the capacitance of the capacitor and the properties of the dielectric, a supplementary electrical current is produced, besides the ohmic current. This supplementary contribution cannot be neglected in some cases.\u0000In this paper, the Curie effect, describing the action potential dynamics in cardiac tissue, assumed isotropic, is incorporated in the monodomain equation. The novelty is that this approach does not use fractional order derivatives and the obtained mathematical description with these equations is objective.","PeriodicalId":37556,"journal":{"name":"INCAS Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138607386","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

Cartesian coordinates of an intrinsically defined curve 本构曲线的笛卡尔坐标

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.18

S. Radnef

引用次数: 0

The effects of distributed electric propulsion on the aerodynamics of a regional aircraft wing 分布式电力推进对支线飞机机翼空气动力学的影响

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.6

Dennis Stefan Chelemen, Ionuț Bunescu, Mihai-Victor Pricop, M. Stoican

{"title":"The effects of distributed electric propulsion on the aerodynamics of a regional aircraft wing","authors":"Dennis Stefan Chelemen, Ionuț Bunescu, Mihai-Victor Pricop, M. Stoican","doi":"10.13111/2066-8201.2023.15.4.6","DOIUrl":"https://doi.org/10.13111/2066-8201.2023.15.4.6","url":null,"abstract":"A study is performed to comprehensively evaluate the aerodynamic performance of a regional aircraft designed for short-haul flights, with a particular focus on the effects of distributed electric propulsion (DEP) on aerodynamic performances. This effort aligns well with a core objective of the Clean Aviation program to decrease carbon emissions within the aviation sector. To address this challenge, we propose a concept that considers incorporating electric motors to complement the conventional propulsion system of a regional aircraft wing. These electric motors have the capability to draw power from either the traditional turboprop engine or exclusively from an on-board electrical generator, providing an innovative pathway for emissions reduction. The central focus of this study revolves around a detailed examination of the aerodynamic efficacy with respect to the placement of engines within the wing. It seeks to ascertain whether optimal aerodynamic efficiency is achieved through the adoption of a greater number of smaller-diameter motors, characterized by reduced power output to the shaft. Alternatively, the study explores the prospect of employing a reduced number of motors, each possessing larger diameters and correspondingly augmented power output. While a larger motor size may intuitively suggest superiority in terms of thrust, it remains imperative to meticulously evaluate the potential influence of the associated drag factor. This research contributes to the growing body of knowledge in the realm of aviation by shedding light on the intricate interaction between aerodynamic efficiency and power output in the context of propulsion system design.","PeriodicalId":37556,"journal":{"name":"INCAS Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138606316","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

Tribology of vegetal oils as base for eco-friendly nano additivated lubricants 作为环保型纳米添加剂润滑油基料的植物油的摩擦学特性

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.11

D. Guglea, G. Cristea, L. Deleanu, T. F. Ionescu, G. Ojoc, D. Dima, C. Georgescu

{"title":"Tribology of vegetal oils as base for eco-friendly nano additivated lubricants","authors":"D. Guglea, G. Cristea, L. Deleanu, T. F. Ionescu, G. Ojoc, D. Dima, C. Georgescu","doi":"10.13111/2066-8201.2023.15.4.11","DOIUrl":"https://doi.org/10.13111/2066-8201.2023.15.4.11","url":null,"abstract":"This paper presents an analysis based on experimental data for pointing out the behavior of rapeseed oil when it is additivated with a modifier of friction and wear, the nano hexagonal Boron nitride. All tests are done on a four-ball machine, in mild regime. Test parameters were sliding velocity (0.38 m/s, 0.53 m/s, 0.69 m/s, corresponding to the spindle rotational speed of the four-ball machine of 1000 rpm, 1400 rpm, 1800 rpm (±10 rpm),), force (100 N – 300 N), test duration 1 h. There were calculated the average friction coefficient during the test and the average wear scar diameter (WSD) for each test. The same test parameters were done twice and the values in this paper are the average of these two tests. Wear was discussed for the same velocity range, in terms of WSD, but for comparing tests with different sliding velocity (implicitly, different sliding distances), there was used the wear rate of the wear scar diameter. The results on wear parameters, using additivated rapeseed oil, do not show spectacular results for the parameters tested in this study, but underline the “insensitivity” of the lubricants to the variation of the test regime (especially with respect to sliding speed), which is desirable for certain applications.","PeriodicalId":37556,"journal":{"name":"INCAS Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138606464","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

Sensor Data Fusion using Kalman Filter for LAPAN-A2 Satellite Attitude Estimation 利用卡尔曼滤波器将传感器数据融合用于 LAPAN-A2 卫星姿态估计

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.1

Shabri C. Akmal, R. E. Poetro, Javensius Sembiring, S. Utama

引用次数: 0

Design and manufacture of a UAV using additive technologies and composite materials 利用添加技术和复合材料设计和制造无人驾驶飞行器

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.14

Razvan Alexandru Mihailescu, Ionel Simion

引用次数: 0

The analytical and numerical study of alternative fuel injectors for the purpose of reducing chemical pollution in aviation sector 以减少航空业化学污染为目的的替代燃料喷射器分析和数值研究

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.7

G. Cican, Georgiana Ichim

{"title":"The analytical and numerical study of alternative fuel injectors for the purpose of reducing chemical pollution in aviation sector","authors":"G. Cican, Georgiana Ichim","doi":"10.13111/2066-8201.2023.15.4.7","DOIUrl":"https://doi.org/10.13111/2066-8201.2023.15.4.7","url":null,"abstract":"In this paper, both analytical and numerical analyses are conducted to study the behavior of a simplex time injector with a swirl chamber represented by a pin, designed to operate with kerosene. In an effort to reduce chemical pollution, the injector's performance when operating with alternative fuels such as biofuel and ethanol is investigated. Calculations have been performed to analyze the use of these three fuels at various pressures up to 100 bar. Analytical calculations were used to determine parameters such as spray angle, droplet size, fuel film thickness, and more. For a better visualization of the phenomena occurring during the injector's operation with these three fuels, numerical simulations were carried out using ANSYS, and the spray of droplets at various pressures at the injector inlet was presented. The study revealed that among the liquids studied, ethanol is the most optimal fuel. Ethanol has low viscosity and low density, making it easier to atomize by our injector compared to pure biofuel, which has higher density and viscosity values. The calculations demonstrated the qualities of ethanol following atomization, including a thin liquid film, a wide spray angle consisting of small-sized droplets, at any pressure difference, compared to the other studied fuels. It was observed that pressure difference has a significant impact on the atomization of a liquid. The best atomization qualities and optimal values were achieved when the pressure difference is high.","PeriodicalId":37556,"journal":{"name":"INCAS Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138607371","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

Design of a robust controller for the VEGA TVC using the L1-Adaptive Control 利用 L1 自适应控制为 VEGA TVC 设计鲁棒控制器

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.15

Naji Anees Muqdad Naji, Adrian Stoica

引用次数: 0

Implementing the Propeller Speed Control of Drone Designed in Solidworks in CoppeliaSim Robotic Simulator Environment with Codes Prepared in Matlab 用 Matlab 编制的代码在 CoppeliaSim 机器人模拟器环境中实现 Solidworks 设计的无人机螺旋桨速度控制

INCAS Bulletin Pub Date : 2023-12-02 DOI: 10.13111/2066-8201.2023.15.4.20

Bülent Si̇ğergök, Mehmet Çavaş

{"title":"Implementing the Propeller Speed Control of Drone Designed in Solidworks in CoppeliaSim Robotic Simulator Environment with Codes Prepared in Matlab","authors":"Bülent Si̇ğergök, Mehmet Çavaş","doi":"10.13111/2066-8201.2023.15.4.20","DOIUrl":"https://doi.org/10.13111/2066-8201.2023.15.4.20","url":null,"abstract":"Real-time applications of autonomous systems are simulated in the computer environment to ensure that they operate error-free or with minimal errors. Coppeliasim, used in this field, is a platform where several sample models, robots, sensors and actuators are used together, a virtual world is created and interacted with it throughout the working period. Having a comprehensive toolbox, autonomous vehicle training and virtual reality, Coppeliasim's compatibility with Solidworks, a very useful design program for drawing, seems to be a great advantage. Due to these features, CoppeliaSim is very important in predicting and solving problems that may arise in many different applications. The propeller movement of the drone, which we designed with the Solidworks 2020 program and transferred to the Coppeliasim platform using the URDF exporter method, was carried out with the Coppeliasim simulator. In our work, Coppeliasim is synchronized with the simulator and MATLAB API codes. While the drone propellers were working on the Coppeliasim platform, angular speed and timing controls were made using the codes we prepared in the MATLAB program. Additionally, this work shows that drones or different autonomous systems can be controlled and designed before real-time operation using the Coppeliasim simulator and the MATLAB program.","PeriodicalId":37556,"journal":{"name":"INCAS Bulletin","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138607218","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