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Synthesis, characterization, and antimicrobial properties of copper oxide nanoparticles produced by laser ablation method in chitosan solution 壳聚糖溶液中激光烧蚀法制备氧化铜纳米颗粒的合成、表征及抗菌性能
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1596
Nabila Dyah Rifani, Rebriarina Hapsari, Tyas Prihatiningsih, A. Khumaeni
Copper Oxide Nanoparticles (CuONPs) show a broad spectrum of antimicrobial activity against various species of microorganisms, including gram-positive and gram-negative fungi and bacteria, but in general gram-negative bacteria are more resistant to the effects of copper nanoparticle ions than gram-positive ones. In this work, synthesis of copper oxide nanoparticles has been carried out using laser ablation methods and the nanoparticles were applied as antibacterial agent against gram-positive bacteria Enterococcus faecalis. Experimentally, Nanoparticle synthesis was carried out using laser ablation with a power of 40 mJ. Antibacterial test with disc diffusion test using disc paper soaked in 0.1% chitosan solution (negative control), sodium hypochlorite (positive control), and copper oxide nanoparticles with a concentration of 60 ppm, 80 ppm, 100 ppm; then put into a petri dish that has been planted with the Enterococcus faecalis bacteria. Copper oxide nanoparticles were formed in chitosan as confirmed by UV-Vis, FTIR, SEM and EDX analysis. Post Hoc Tukey HSD analysis showed a significant difference in the negative control group, and the inhibition zone diameter of the treatment group was the same. The synthesis of nanoparticles using laser ablation fired at a pure copper plate succeeded in producing copper oxide nanoparticles in chitosan solvent. The firing time affects the concentration and size of the nanoparticles. More laser energy is required to produce a smaller particle size due to its antibacterial activity.
氧化铜纳米粒子(CuONPs)对各种微生物表现出广谱的抗菌活性,包括革兰氏阳性和革兰氏阴性真菌和细菌,但一般来说,革兰氏阴性细菌比革兰氏阳性细菌更能抵抗铜纳米粒子离子的影响。在这项工作中,使用激光烧蚀方法合成了氧化铜纳米颗粒,并将其用作革兰氏阳性菌粪肠球菌的抗菌剂。在实验上,使用功率为40mJ的激光烧蚀进行纳米颗粒合成。使用浸泡在0.1%壳聚糖溶液(阴性对照)、次氯酸钠(阳性对照)和浓度为60ppm、80ppm、100ppm的氧化铜纳米颗粒中的圆盘纸进行圆盘扩散试验的抗菌试验;然后放入培养皿中,培养皿中已种植有粪肠球菌。紫外-可见光谱、红外光谱、扫描电镜和能谱分析证实,壳聚糖中形成了氧化铜纳米粒子。Post Hoc Tukey HSD分析显示,阴性对照组有显著差异,治疗组的抑制区直径相同。利用激光烧蚀法在纯铜板上合成纳米颗粒,成功地在壳聚糖溶剂中制备了氧化铜纳米颗粒。烧制时间影响纳米颗粒的浓度和大小。由于其抗菌活性,需要更多的激光能量来产生更小的颗粒尺寸。
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引用次数: 0
Specifics of the requirements for the interior layout of long-haul aircraft 长途飞机内部布局要求的细节
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1465
M. Kuprikov, A. Orekhov, Yelizaveta D. Shulga, Yangguang Min
The plane has become a convenient method of transportation. The main idea of aviation in the 21st century is the safety of passengers and crew. But the human is always inclined towards comfort. The structural and parametric analysis of the long-haul aircraft development made it possible to form the concept of the fuselage layout with capsule accommodation of passengers. The proposed variant of the capsule accommodation, designed for the Boeing 777-200LR, can be installed in other passenger airliners with a ceiling height of at least 2.1 m. Analysis of alternative options for the layout of the passenger compartment allows us to state: with a flight range of more than 8 hours, the flight is comfortable only in business or first classes; the proposed two-story capsule placement allows to provide the layout with first-class seats in a given cabin.
飞机已成为一种方便的交通工具。21世纪航空的主要理念是乘客和机组人员的安全。但人类总是倾向于舒适。对长途飞机发展的结构和参数分析使得形成乘客舱式机身布局的概念成为可能。该舱舱的拟议改型是为波音777-200LR设计的,可以安装在天花板高度至少为2.1米的其他客机上。通过分析乘客舱布局的备选方案,我们可以得出这样的结论:在飞行时间超过8小时的情况下,只有商务舱或头等舱的乘客才会感到舒适;拟议的两层胶囊布局允许在给定的机舱内提供头等舱座位的布局。
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引用次数: 0
Protection Challenges on Integration of Distributed Sources to Power system network: A Review 分布式电源与电网集成的保护挑战综述
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1630
Hinal Shah, J. Chakravorty
— Electricity generation has to be increased to meet various type of future load demand like LED lightning, Electrical Vehicles, mobiles, communication network, non linear load etc. Automation is essential requirement now a days in each sector. To provide automation at residential, commercial and industrial sectors electrical energy is required. To meet energy requirement of various sector utility grid is integrated with DG Sources, which mainly include renewable energy sources like solar, wind and other environment friendly sources either in large scale or small scale depends on the location and availability. This type of technology leads power system to era of smart grid. Smart grid technology provides features like digitization, two way communication, distributed generation, adaptive islanding, self monitoring and self mitigating, fully controllable compare to conventional Grid. Though smart grid technology is advantageous but due to integration of distributed generation at transmission and distribution system will increase protection challenges in the power network. This paper gives an insight of different protection issues which occur at transmission, distribution and Micro grid network. The paper also focuses on the techniques and solution of the various protection challenges.
--必须增加发电量,以满足未来各种类型的负载需求,如LED闪电、电动汽车、移动设备、通信网络、非线性负载等。自动化现在是每个行业的基本要求。为了在住宅、商业和工业部门提供自动化,需要电能。为了满足各部门的能源需求,公用电网与DG电源集成,DG电源主要包括可再生能源,如太阳能、风能和其他环境友好型电源,根据位置和可用性的不同,可大规模或小型使用。这种技术使电力系统进入智能电网时代。与传统电网相比,智能电网技术具有数字化、双向通信、分布式发电、自适应孤岛、自监测和自缓解、完全可控等特点。尽管智能电网技术是有利的,但由于输电和配电系统的分布式发电集成,将增加电网中的保护挑战。本文深入分析了输电、配电和微电网中出现的不同保护问题。本文还重点介绍了各种保护挑战的技术和解决方案。
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引用次数: 0
Mathematical Modelling of Composite Phantoms for the Calibration of Ultrasound Devices 超声设备校正用复合幻像的数学建模
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1535
J. Bravo-Castillero, R. O. Caballero-Pérez, Ana Paulina Haro-Álvarez, Francisco Heredia-López, N. Hevia-Montiel, María Del Carmen Jorge, R. Medina-Esquivel, Erik Molino-Minero-Re, José Antonio Neme-Castillo, J. Perez-Gonzalez, Joel Humberto Sánchez-Paz, C. Valés-Pinzón
We propose a methodology to narrow down the selection of design parameters of phantoms for calibrating ultrasound devices. For doing so, we model the phantoms as composite materials. Through a mathematical homogenization technique, the global properties of the phantom are given in terms of the volume fractions of its components, their geometric shapes and physical properties. We explore these parameters to determine ranges that yield the desirable values of acoustic impedance and attenuation. The procedure is illustrated for a class of sandwich-like phantoms made of layers of agar of different concentrations with complex elastic moduli. In this example, homogenization provides analytical formulae of the global properties that can be used to identify the layers’ thicknesses and concentrations that yield a low impedance and an average attenuation coefficient. These analytical results are compared with a numerical homogenization method, showing excellent agreement.
我们提出了一种方法来缩小用于校准超声设备的模型设计参数的选择范围。为此,我们将模型建模为复合材料。通过数学均匀化技术,给出了体模的整体性质,包括其组件的体积分数、几何形状和物理性质。我们探索这些参数,以确定产生所需声学阻抗和衰减值的范围。说明了一类由具有复杂弹性模量的不同浓度琼脂层制成的三明治状模型的程序。在本例中,均化提供了全局特性的分析公式,可用于识别产生低阻抗和平均衰减系数的层的厚度和浓度。将这些分析结果与数值均匀化方法进行了比较,显示出良好的一致性。
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引用次数: 0
Characterization of Nano-liter Sessile Droplets By Using An Active Microwave Resonance Probe. 利用有源微波共振探针表征纳米级液滴。
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1992
C. E. Rodríguez, O. Kolokoltsev, D. Matatagui, N. Qureshi, C. Ordóñez
In this work we present a microwave intracavity sensor for the characterization of aqueous solutions of nano-liter sessile droplets, deposited on the microstrip line electrode. The sensor operates at  frequency and is based on tunable magnonic delay line oscillator. The samples were characterized by using their evaporation dynamics, by measuring their dielectric constants. The experiments have shown that the sensor is capable of detecting the salinity (S) of water with the required precision and resolution. The advantage of the sensor is the possibility of measuring the parameters such as S, Total Dissolved and Total Suspended Solids, simultaneously.
在这项工作中,我们提出了一种微波腔内传感器,用于表征沉积在微带线电极上的纳米升不变液滴水溶液。该传感器是基于可调磁延迟线振荡器的频率传感器。利用蒸发动力学和介电常数对样品进行表征。实验结果表明,该传感器能够以要求的精度和分辨率检测水体的盐度。该传感器的优点是可以同时测量S、总溶解物和总悬浮物等参数。
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引用次数: 0
Performance simulation of water turbines by using 6-DoF UDF and sliding mesh methods 基于六自由度UDF和滑动网格法的水轮机性能仿真
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1568
Edwin Lenin Chica Arrieta, J. Betancour, L. Velásquez, A. Rubio Clemente
In this work, a comparison between the six degrees of freedom (6-DoF) method and the sliding mesh approach in computational fluid dynamics simulations of an Archimedes screw turbine for hydrokinetic applications was performed using ANSYs Fluent software. The numerical curves obtained by representing the power coefficient () values versus the tip speed ratio ( or ) were compared based on the experimental data available in the literature. Therefore, by considering the  values as the comparison benchmark parameter between the numerical and experimental data, the error obtained when using the 6-DoF method and the sliding mesh approach was 13% and 40%, respectively. Both methods allowed the simulation of the rotor rotation, although the 6-DoF method was more accurate in the prediction of the turbine performance, higher computational resources were consumed in comparison with the sliding mesh method, which allows to obtain a computational solution in affordable times.
本文利用ANSYs Fluent软件对阿基米德螺杆式水轮机的六自由度(6-DoF)方法和滑动网格方法进行了流体动力学仿真比较。在文献实验数据的基础上,比较了功率系数()值与叶顶速比()的数值曲线。因此,将该数值作为数值与实验数据的比较基准参数,采用六自由度法和滑动网格法得到的误差分别为13%和40%。两种方法都可以模拟转子的旋转,虽然6自由度方法在涡轮性能预测上更准确,但与滑动网格方法相比,消耗的计算资源更高,可以在负担得起的时间内获得计算解。
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引用次数: 0
Dispatcher I-queue Optimization in Join Idle Queue Algorithm for Improved Load Balancing in Cloud Computing 云计算中加入空闲队列算法中的Dispatcher I-queue优化
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1621
Sudha Narang
Objectives: Modern data centers serving web and mobile applications employ distributed load balancers. The Join Idle Queue (JIQ) algorithm is ideally suited for load balancing in a distributed setup. It attains fast response time by directing service requests to idle servers which can immediately process them. However, JIQ is not optimal in tracking idle servers leaving room for improvement. Methods: We observed that JIQ assigns idle servers non-uniformly to load balancers leaving some load balancers with no access to idle servers. We propose a variant of the JIQ algorithm, Join Idle Queue Dispatcher I-queue Optimization (JIQ-DIO), which increases the probability of load balancers having access to idle servers without additional communication overhead leading to improved response time. Findings: We simulated JIQ-DIO on CloudSim Plus 3.0 and compared it with standard JIQ and its different variants. JIQ-DIO was found to increase the probability of incoming requests being directed to idle servers and lead to more than two-fold improvement in response time across a broad range of parameters.
目标:服务于web和移动应用程序的现代数据中心采用分布式负载平衡器。Join Idle Queue (JIQ)算法非常适合分布式设置中的负载平衡。它通过将服务请求定向到可以立即处理它们的空闲服务器来获得快速响应时间。但是,JIQ在跟踪空闲服务器方面并不是最优的,这给改进留下了空间。方法:我们观察到JIQ不均匀地将空闲服务器分配给负载平衡器,使一些负载平衡器无法访问空闲服务器。我们提出了JIQ算法的一种变体,Join Idle Queue Dispatcher I-queue Optimization (JIQ- dio),它增加了负载平衡器访问空闲服务器的概率,而没有额外的通信开销,从而改善了响应时间。结果:我们在CloudSim Plus 3.0上模拟JIQ- dio,并将其与标准JIQ及其不同变体进行比较。发现JIQ-DIO增加了传入请求被定向到空闲服务器的可能性,并在广泛的参数范围内将响应时间提高了两倍以上。
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引用次数: 0
Design of an Integrated Automation & Control System Using Petri Nets: Case Study 基于Petri网的集成自动化控制系统设计:案例研究
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1562
J. R. Núñez-Álvarez, I. Benítez-Pina, G. Acosta-Montoya, Alfredo Pino-Escalona, Luisa Villafuela-Loperena
El Sistema de Control y Automatización Integrado (IACS) basado en el control de eventos discretos mediante redes de Petri (PN) que abarca el diseño, análisis y validación de modelos de sistemas de bombeo industrial no se utilizan comúnmente. Nuestro caso de estudio es el diseño e implementación de un sistema de supervisión utilizando el software GHENeSys PN y EROS en la Estación de Bombeo "San Juan" en Santiago de Cuba, Cuba. Estas herramientas permiten describir los modelos de los estados del proceso automático local y el funcionamiento del Supervisor, para tener en cuenta, las funciones de Mantenimiento Preventivo y Tratamiento de Alarmas. El IACS parte de la simulación MatLab de los lazos de control principales y utiliza la red jerárquica extendida GHENeSys para modelar un sistema de automatización integrado estructurado modularmente que responde a las demandas funcionales sincronizadas. Esta metodología tiene las ventajas de una modularidad jerárquica completa desde el control local hasta la gestión de producción, varias herramientas modulares de verificación y validación y compatibilidad total con IEC61131. Esto reduce los errores de diseño y el tiempo de implementación con una mayor eficiencia de integración.
基于Petri网络(PN)离散事件控制的集成控制与自动化系统(IACS),涵盖了工业泵系统模型的设计、分析和验证,目前还不常用。我们的案例研究是在古巴圣地亚哥的“圣胡安”泵站使用GHENeSys PN和EROS软件设计和实现一个监控系统。这些工具允许描述本地自动化过程状态和监控器操作的模型,以考虑预防性维护和报警处理功能。IACS从主控制回路的MatLab仿真开始,使用扩展层次网络GHENeSys来建模一个模块化结构的集成自动化系统,响应同步功能需求。该方法具有从本地控制到生产管理的全层次模块化、多种模块化验证和验证工具以及与IEC61131的完全兼容的优点。这减少了设计错误和实现时间,提高了集成效率。
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引用次数: 0
Prediction of weather forecasting using artificial neural networks 人工神经网络在天气预报中的应用
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1698
A. Ajina, Jaya Christiyan K G, Dheerej N Bhat, Kanishk Saxena
Currently, weather forecasting is the most commonly discussed topic by social and economic activists. It is also attracting widespread interest due to its application in various public and private sectors that include marine, agriculture, air traffic, and forestry. Recent developments have made climatic changes happen at a dramatic rate, making old methods of weather forecasting less effective, more hectic, and unreliable. Improved and efficient methods of weather prediction are needed to overcome these difficulties. This paper describes machine learning approaches using artificial neural networks to predict the weather of a particular city and compare the different weather conditions in different cities. We demonstrate empirically that Artificial Neural Networks produce very low deviations hence providing nearly accurate results for weather forecasts on a daily basis.
目前,天气预报是社会和经济活动家最常讨论的话题。由于它在海洋、农业、航空运输和林业等公共和私营部门的应用,它也引起了广泛的兴趣。最近的发展使气候变化以惊人的速度发生,使旧的天气预报方法变得不那么有效、更加繁忙和不可靠。需要改进和有效的天气预报方法来克服这些困难。本文描述了使用人工神经网络的机器学习方法来预测特定城市的天气,并比较不同城市的不同天气条件。我们从经验上证明,人工神经网络产生的偏差非常低,因此每天为天气预报提供几乎准确的结果。
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引用次数: 0
Improved Real Time Target Tracking System Based on Cam-shift and Kalman Filtering Techniques 基于凸轮移位和卡尔曼滤波技术的改进实时目标跟踪系统
Q3 Engineering Pub Date : 2023-04-27 DOI: 10.22201/icat.24486736e.2023.21.2.1565
H. Fiyad, M. Abozied, H. Metwally, Mohamed Abd El-Hameed Abd El-Naeem
This paper presents an improved real time target tracking system based on Cam-Shift and advanced Kalman filter algorithms. The paper, proposes a simple low implementation cost scheme while keeping the high tracking performance. Two degrees of freedom target tracking system based on two hybrid stepper motors with their drive systems is fully designed and implemented to improve the tracking accuracy while keeping low-cost. The potential of the proposed algorithm lies in its ability to accurately detect, track and produce firing commands on the designated target while utilizing low cost on the shelf embedded Microcontroller boards. A low cost Universal Serial Port (USB) camera is used and integrated with the proposed algorithm in order to detect and track maneuvering targets. A series of experiments for stationary and moving objects are carried out for testing the proposed system efficiency. The proposed system enables accurate performance for tracking static and moving objects. Hence it provides a simple and low implementation cost scheme for real time object tracking applications.
本文提出了一种改进的基于Cam-Shift和先进卡尔曼滤波算法的实时目标跟踪系统。本文提出了一种简单的低成本实现方案,同时保持了高的跟踪性能。为提高跟踪精度,同时保持低成本,设计并实现了基于双混合步进电机及其驱动系统的二自由度目标跟踪系统。该算法的潜力在于它能够准确地检测、跟踪和产生对指定目标的射击命令,同时利用低成本的架子嵌入式微控制器板。为了检测和跟踪机动目标,采用了一种低成本的通用串行端口(USB)摄像机,并与该算法相结合。为了验证所提出的系统的有效性,对静止和运动物体进行了一系列实验。所提出的系统能够精确地跟踪静态和运动物体。从而为实时目标跟踪应用提供了一种简单、低成本的实现方案。
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引用次数: 0
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Journal of Applied Research and Technology
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