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Numerical Investigation of Magnetohydrodynamic Flow of Reiner– Philippoff Nanofluid with Gyrotactic Microorganism Using Porous Medium 多孔介质中陀螺微生物对Reiner - Philippoff纳米流体磁流体动力流动的数值研究
Q4 Earth and Planetary Sciences Pub Date : 2023-07-11 DOI: 10.37394/232025.2023.5.8
S. Lakshmi, S. Sreedhar, S. Devi
Nanoparticles facilitate the enrichment of heat transmission, which is crucial in many industrial and technical phenomena. The suspension of nanoparticles with microbes is another intriguing study area that is pertinent to biotechnology, health sciences, and medicinal applications. In the dispersion of nanoparticles, the conventional non-Newtonian fluid Reiner-Philippoff flows across a stretching sheet, which is examined in this article using numerical analysis. This study investigates the numerical investigation of Arrhenius reaction, heat radiation, and vicious variation variations on a Reiner-Philippoff nanofluid of MHD flow through a stretched sheet. Thus, for the current nanofluid, nanoparticles and bio-convection are highly crucial. The set of nonlinear differential equations is translated into Ordinary Differential Equations (ODEs) utilizing the requisite translation of similarities. These collected simple ODE are solved using the MATLAB computational tool bvp4c method. The graphical results for the velocity, concentration, motile microorganisms, and temperature profile are defined using the thermophoresis parameter and the Brownian motion respectively. Consider a tube containing gyrotactic microbes and a regular flow of nanofluid which is electrically conducted through a porous stretched sheet surface. This nonlinear differential problem is solved by a hybrid numerical solution method using fourth-order Runge-Kutta with shooting technique. The optimization method also performs well in terms of predicting outcomes accurately. As a result, the research applies the Bayesian Regularization Method (BRM) to improve the accuracy of the prediction results. Physical constraints are plotted against temperature, velocity, concentration, and microorganism profile trends and they are briefly described.
纳米粒子促进了热传递的富集,这在许多工业和技术现象中是至关重要的。纳米颗粒与微生物的悬浮是与生物技术、健康科学和医学应用相关的另一个有趣的研究领域。在纳米颗粒的分散中,传统的非牛顿流体莱纳-菲利普波夫流流过拉伸片,这在本文中使用数值分析进行了检验。本文研究了MHD纳米流体流过拉伸薄片时的Arrhenius反应、热辐射和恶性变差的数值模拟。因此,对于当前的纳米流体,纳米颗粒和生物对流是至关重要的。利用必要的相似性转换,将一组非线性微分方程转化为常微分方程。利用MATLAB计算工具bvp4c方法对收集到的简单ODE进行求解。用热泳参数和布朗运动分别定义了流速、浓度、活动微生物和温度分布的图形结果。考虑一根装有回旋式微生物的管子和一股有规律的纳米流体,这种纳米流体是通过多孔的拉伸薄片表面导电的。采用四阶龙格-库塔与射击技术相结合的混合数值解法对该非线性微分问题进行了求解。优化方法在预测结果准确性方面也表现良好。因此,本研究采用贝叶斯正则化方法(BRM)来提高预测结果的准确性。根据温度、速度、浓度和微生物剖面趋势绘制了物理约束,并对它们进行了简要描述。
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引用次数: 0
The Mutual Effect Study of Horizontal and Vertical Loads on the Elastic Tank Partially Filled with Liquid 部分充液弹性罐水平与垂直荷载相互作用研究
Q4 Earth and Planetary Sciences Pub Date : 2023-06-26 DOI: 10.37394/232025.2023.5.6
O. Sierikova, E. Strelnikova, D. Kriutchenko, I. Hariachevska
Modern equipment elements in the energy, chemical industry, transport, aviation, and space engineering work under conditions of increased technological loads, at high temperatures and pressure levels. At the same time, the equipment is usually exposed to external loads of various natures. Hydroelastic phenomena must also be taken into account in designing and modernizing tanks and storage facilities for flammable and combustible substances. Flammable and combustible liquid accumulation leads to the increased environmental and fire hazard of such objects. The possible dangerous liquid leakage and tank depressurization negatively affect the surrounding area environment state. A fire in the tank is one of the most dangerous emergencies that could lead both to significant material and environmental damage and to human casualties. The paper treats the environmental hazards reducing problem from liquid hydrocarbon spills from storage tanks, which lead to destructive effects on all environment components especially during emergency situations. It has been established for sufficiently thin tank elastic walls, the fundamental frequency during coupled oscillations could be much lower than the frequency of the fluid in the shell with rigid walls. As the thickness of the tank wall increases, this effect becomes insignificant, and the lower oscillation frequency of the shell with liquid approaches the oscillation frequency of the liquid in a rigid tank. Parametric resonance and sub-resonance effects have been treated.
能源、化工、运输、航空和航天工程中的现代设备元件在不断增加的技术负荷、高温和高压条件下工作。同时,设备通常暴露在各种性质的外部负载下。在设计和现代化储罐和储存易燃和可燃物质的设施时,也必须考虑到水弹性现象。易燃可燃液体的积聚会增加这类物品的环境和火灾危险。可能发生的危险液体泄漏和储罐减压对周边环境状态产生负面影响。储罐着火是最危险的紧急情况之一,可能导致重大的物质和环境破坏以及人员伤亡。本文论述了储罐液态烃泄漏对环境各组成部分造成的破坏性影响,特别是在紧急情况下的环境危害降低问题。在足够薄的罐壁弹性条件下,耦合振荡的基频可以大大低于刚性壁壳体内流体的频率。随着罐壁厚度的增加,这种影响变得不明显,有液壳体的下振荡频率接近刚性罐内液体的振荡频率。讨论了参数共振和次共振效应。
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引用次数: 0
Advanced Manufacturing System 先进制造系统
Q4 Earth and Planetary Sciences Pub Date : 2023-05-24 DOI: 10.37394/232025.2023.5.5
D. Ghelase, L. Daschievici
In order to address the present-day changes and tendencies, the industrial enterprise has advanced in its manner of approaching the manufacturing processes by performing a high integration of operations, functions and compartments. One can say that we are dealing with a single structure, with no organising levels, of the enterprise which reacts to inputs and manufactures the requested product by almost immediately adapting to the customers’ requirements or to the requirements of other interested parties.
为了应对当今的变化和趋势,工业企业通过执行操作、功能和部门的高度集成,在接近制造过程的方式上取得了进步。可以说,我们正在处理的是企业的单一结构,没有组织层次,它对输入作出反应,并通过几乎立即适应客户的要求或其他相关方的要求来生产所要求的产品。
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引用次数: 0
Selection of Organizational Structure of the Company in the Period of Digital Transformation Using the SCARF Model 基于围巾模型的数字化转型时期公司组织结构选择
Q4 Earth and Planetary Sciences Pub Date : 2023-04-27 DOI: 10.37394/232025.2023.5.4
N. Mamedova, Elena I. Belyakova, A. Urintsov
The article is devoted to the problem of selecting the organizational structure of the company during its implementation of digital transformation of business processes. The hypothesis of the study was that consideration of the needs of decision-makers can and should influence the choice of organisational structure changes during the transition to digital transformation of business processes. The decision makers for managing the integration of digital technologies into key aspects of a company's business activities have been shown to be CIOs. Motivational filters that characterize the needs of CIOs according to the SCARF model were presented in a hierarchical combination along with the types of company strategies that can be implemented during the digital transformation of business processes. The SCARF model, the Saaty hierarchy analysis method and the mixed-methods strategy provided the methodological basis for the study. The results demonstrate a justified choice of optimal organizational structure based on the factors of organizational behavior of IT directors and strategic priorities of the company. The presented results can be used to justify the decision to change the organizational structure of the company and to assess the social needs of decision makers.
本文研究了公司在实施业务流程数字化转型过程中组织结构的选择问题。该研究的假设是,在业务流程向数字化转型的过渡过程中,考虑决策者的需求可以而且应该影响组织结构变化的选择。将数字技术整合到公司业务活动的关键方面的决策者已经被证明是首席信息官。根据SCARF模型表征首席信息官需求的动机过滤器与在业务流程数字化转型期间可以实施的公司战略类型以分层组合的形式呈现。SCARF模型、Saaty层次分析法和混合方法策略为研究提供了方法学基础。研究结果表明,基于IT主管组织行为和公司战略优先级因素的最优组织结构选择是合理的。提出的结果可以用来证明改变公司组织结构的决定,并评估决策者的社会需求。
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引用次数: 0
Numerical Study on Wind Pressures Caused by the Variation of the Rounding Radii of the Industrial Shed Eaves 工业棚屋屋檐圆角半径变化引起的风压数值研究
Q4 Earth and Planetary Sciences Pub Date : 2023-04-25 DOI: 10.37394/232025.2023.5.2
Guilherme S. Teixeira, M. de Campos
This work approached a typical industrial shed with varied rounded eaves, which is pointed out, in the few papers on it, as favorable to structural safety against the action of the winds. Since the literature has neglected this building configuration, the external pressure coefficients were obtained by CFD with the aid of the Ansys Workbench software, applying tetrahedral meshes in the domain discretization. Furthermore, the boundary layer around the building was modeled for greater accuracy in data capture. Using the RNG K-Epsilon model, were determined the turbulent flow effects. The results indicated a reduction in the pressure coefficients in the most sensitive regions and prone to accidents caused by wind on the roof. Finally, the flow pattern can be measured using the presented velocity fields.
这项工作接近一个具有各种圆形屋檐的典型工业棚屋,在少数几篇关于它的论文中指出,这有利于结构安全抵御风的作用。由于文献忽略了这种建筑构型,因此采用四面体网格进行域离散,借助Ansys Workbench软件,通过CFD计算得到了外压系数。此外,对建筑物周围的边界层进行了建模,以提高数据捕获的准确性。采用RNG K-Epsilon模型,确定了紊流效应。结果表明,在最敏感的区域,压力系数降低,容易发生由屋顶风引起的事故。最后,利用给出的速度场可以测量流型。
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引用次数: 0
Numerical Simulation in the Wind Action Analyses in Logistic Sheds with a Bridge Vent 桥式通风口物流棚风作用分析的数值模拟
Q4 Earth and Planetary Sciences Pub Date : 2023-04-25 DOI: 10.37394/232025.2023.5.3
L. Mendes, M. de Campos
Using Ansys Fluid Flow software, a numerical investigation was to study the wind distribution around logistic sheds with a bridge vent. Then, were considered several wind directions - direct approaching, oblique, oblique opposing, lateral, and opposing - and neighborhood conditions. The Shear Stress Transport turbulence model and rectangular mesh were employed. The application validation of the CFD technique occurred in the logistic shed without a bridge vent, and the results showed good concordance with the literature. Results analyzed areas characterized by suction and overpressure, as well as the attachment points and the recirculation zones in the flow visualization.
利用Ansys Fluid Flow软件,对具有桥式通风口的物流棚周围的风场进行了数值研究。然后,考虑了几种风向-直接接近,倾斜,倾斜反对,侧向和反对-以及邻近条件。采用剪切应力输运湍流模型和矩形网格。CFD技术的应用验证在无桥式通风口的物流棚内进行,结果与文献吻合较好。结果分析了以吸力和超压为特征的区域,以及流动显示中的附着点和再循环区。
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引用次数: 0
Sensorless Adaptive Observers for Linearly Parameterized Class of Induction Machine 线性参数化感应电机类无传感器自适应观测器
Q4 Earth and Planetary Sciences Pub Date : 2023-04-10 DOI: 10.37394/232025.2023.5.1
A. Chouya
In this paper a new adaptive flux, speed, load torque and rotor resistance observer is proposed for induction machine drive system. The structure of the proposed observer is simple and it is able to give rise to different observers among which adaptive high gain and adaptive sliding mode. We adopt a mild change of coordinates that allows to easily design of adaptive observer. Computer simulation results verify the validity of the proposed estimation algorithm.
本文提出了一种新的自适应磁链、转速、负载转矩和转子电阻观测器。该观测器结构简单,能够产生自适应高增益观测器和自适应滑模观测器。我们采用了一种轻微的坐标变化,使得自适应观测器的设计变得容易。计算机仿真结果验证了所提估计算法的有效性。
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引用次数: 0
Aerodynamic Study and Design of Fixed Wing and Multi-copter Combination 固定翼与多旋翼组合的气动研究与设计
Q4 Earth and Planetary Sciences Pub Date : 2022-12-31 DOI: 10.37394/232025.2022.4.12
Mohamed Alhammadi, Mehran Alavi, Ali Alameri, Sharul Sham Bin Dol
This project aims to design a hybrid drone with fixed wing for the stable cruising as well as multi-copters for the vertical take-off and landing (VTOL) operations. Drones are utilized for number of applications leading from transportation to the surveillance purposes. Some drones are popular for their stable operation, while other for optimum landing and takeoff. Therefore, numerical analysis was performed on propeller, landing gear as well as on whole structure of the drone. The observed result from CFD analysis show that the velocity distribution had maximum velocity of 40 m/s at the mid span of the drone. In addition, the maximum stress obtained was on the landing gear with approximate value of 185 MPa which is due to the weigh and payload of the drone. The final model was built after the analytical and numerical analysis in order to achieve sustainable and reliable prototype.
该项目旨在设计一种用于稳定巡航的固定翼混合无人机,以及用于垂直起降(VTOL)操作的多架直升机。无人机被用于从运输到监视目的的许多应用。一些无人机因其稳定的运行而受欢迎,而另一些则因其最佳的着陆和起飞而受欢迎。因此,对无人机的螺旋桨、起落架以及整体结构进行了数值分析。计算流体动力学(CFD)分析结果表明,无人机跨中处的速度分布最大速度为40 m/s。此外,由于无人机的重量和有效载荷,在起落架上获得的最大应力约为185 MPa。通过分析和数值分析,建立了最终的模型,以实现原型的可持续性和可靠性。
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引用次数: 0
Ant Bee Colony for Automated black-box testing of RESTful API 蚁群用于RESTful API的自动化黑盒测试
Q4 Earth and Planetary Sciences Pub Date : 2022-12-31 DOI: 10.37394/232025.2022.4.10
S. Ahmed, A. Hamdy
Recently, RESTful APIs are widely utilized in a variety of web applications; developers utilize Restful APIs as a blacked-out component in micro-services. Black box testing for Restful APIs is essential as neither of the API’s source code nor its compiled binary is always available for public access. A handful number of research studies were conducted for the automatic generation of test suite for RESTful APIs based on black box testing. However, to our knowledge, none of them considered the test coverage criteria or the test suite optimization. This paper proposed adapting the Artificial Bee Colony (ABC) swarm intelligence algorithm for the automatic generation of test suites for Restful APIs based on Open API Specification (OAS); whilst also maximizing the API test coverage (path, operation, parameter, input value and status code). Experiments were conducted on six APIs that differ from each other in the number of routes, operation types, input values, and how well the API is documented. The experiments showed that the ABC algorithm can generate test suites that achieve high coverage criteria.
最近,RESTful api被广泛应用于各种web应用程序中;开发人员利用Restful api作为微服务中的“黑掉”组件。Restful API的黑盒测试是必不可少的,因为API的源代码和编译后的二进制代码都不总是可供公众访问。针对基于黑盒测试的RESTful api测试套件的自动生成,进行了大量的研究。然而,据我们所知,他们都没有考虑测试覆盖标准或测试套件优化。本文提出了基于开放API规范(Open API Specification, OAS),将人工蜂群智能算法应用于Restful API测试套件的自动生成;同时最大化API测试覆盖率(路径、操作、参数、输入值和状态码)。实验在六个API上进行,这些API在路由数量、操作类型、输入值以及API的文档记录方面各不相同。实验表明,ABC算法可以生成达到高覆盖率标准的测试套件。
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引用次数: 0
COVID -19 Pandemic Effect on the Solar Irradiance: Case Study Ma`an Development Area 新冠肺炎疫情对太阳辐照度的影响——以马安开发区为例
Q4 Earth and Planetary Sciences Pub Date : 2022-12-29 DOI: 10.37394/232025.2022.4.9
Ahlam. M. Alsaidat, Mohamed Reda Ramadan Gomaa
Solar Photovoltaic (PV) Panels are converting solar radiation into an electrical form of energy, the performance, and efficiency of PV Panels are affected by several factors including environmental factors represented by air pollutants) typically includes PM10, fine PM2.5, NOx, Sox, and dust), as many studies have found that the efficiency of PV panels cell decrease when the concentration of air pollutant increase, in these study Air pollutant concentration and solar radiation data, were collected during the COVID-19 Pandemic, the result showed that a huge decrease in air pollutant concertation in Jordanian cities and slightly change in the percentage of solar radiation in study area MDA, the recommend to do the study again in an industrial or densely populated area, where pollution rates will be greater, which means a greater impact on the efficiency of solar PV Panels.
太阳能光伏(PV)板将太阳辐射转化为电能形式,光伏板的性能和效率受到多种因素的影响,包括以空气污染物为代表的环境因素(通常包括PM10、细PM2.5、NOx、Sox和粉尘),许多研究发现,随着空气污染物浓度的增加,光伏板电池的效率降低,在这些研究中,空气污染物浓度和太阳辐射的数据。在2019冠状病毒病大流行期间收集的数据,结果显示约旦城市的空气污染物浓度大幅下降,研究区域MDA的太阳辐射百分比略有变化,建议在工业或人口稠密地区再次进行研究,那里的污染率会更大,这意味着对太阳能光伏电池板效率的影响更大。
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引用次数: 0
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