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Marangoni convection in a C-shape enclosure with partially heated walls 带有部分加热壁的c形外壳中的马兰戈尼对流
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012016
Zailan Siri, Sharifah Nuriza S M N Al ‘Idrus
Abstract A numerical study was carried out to investigate Marangoni convection of nanofluid in a C-shape cavity with partially heated walls. The opposite sides of the walls are cooled at constant temperature while the rest of the partitions are kept adiabatic. The governing equations and boundary conditions are then introduced to describe the fluid flow and temperature distribution within the enclosure before the equations are non-dimensionalised and solved using the finite element method. The solutions, presented as streamlines, isotherms, local Nusselt and average Nusselt for varying Marangoni number, Rayleigh number, and depth, are then discussed.
摘要采用数值方法研究了纳米流体在c形腔内部分加热壁面的马兰戈尼对流。墙的对面在恒温下冷却,而其余的隔墙则保持绝热。然后引入控制方程和边界条件来描述壳体内的流体流动和温度分布,然后将方程无因次化并使用有限元法求解。然后讨论了不同Marangoni数、Rayleigh数和深度的流线、等温线、局部Nusselt和平均Nusselt的解。
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引用次数: 0
Assessing the potential of CO2 huff ‘n’ puff technology for enhanced oil recovery and CO2 sequestration in tight oil reservoirs 评估CO2吞吐技术在致密油储层提高采收率和二氧化碳封存方面的潜力
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012001
Longhui Yu, Hangyu Li, Junrong Liu, Shuyang Liu, Zhiqiang Wang, Qizhi Tan
Abstract Fossil fuels utilization will produce a large amount of CO 2 , which causes a series of environmental problems. However, the exhaust CO 2 can be used to achieve oil recovery improvement (CO 2 EOR), while simultaneously allowing for the geological storage of CO 2 . For the unconventional reservoir, CO 2 huff ‘n’ puff (HNP) is a potential technology showing promising results in laboratory experiments, while its effectiveness in enhancing oil recovery and CO 2 sequestration at the reservoir scale remains uncertain. Thus, further research is needed to evaluate the CO 2 HNP performance for its implementation. In this paper, we conducted a numerical simulation of the CO 2 HNP process in a real tight oil reservoir (1800 m × 350 m × 10m in size) to assess its potential for improving oil recovery, CO 2 injectivity, and CO 2 sequestration. The results show that the accumulative oil production increased by more than 20% after the implementation of CO 2 HNP. Meanwhile, CO 2 HNP in tight oil reservoirs is proven capable to achieve CO 2 injectivities of more than 4×10 7 SCm 3 and CO 2 storages of more than 5×10 6 SCm 3 . We designed 3 CO 2 HNP schemes and found that the largest CO 2 storage does not occur in the optimal scenario for oil production. A new type of CO 2 HNP evaluation system considering oil production and storage capacity needs to be established. The results of the article suggest that CO 2 HNP can achieve an oil production increase and CO 2 storage in tight reservoirs, which has a positive significance for the sustainable development of environmental protection.
化石燃料的利用会产生大量的CO 2,造成一系列的环境问题。然而,废气二氧化碳可以用来提高石油采收率(二氧化碳EOR),同时允许二氧化碳的地质储存。对于非常规油藏而言,二氧化碳吞吸技术(HNP)是一项有潜力的技术,在实验室实验中显示出良好的效果,但其在提高油藏采收率和封存二氧化碳方面的有效性仍不确定。因此,需要进一步的研究来评估其实施的CO 2 HNP性能。在本文中,我们对致密油油藏(尺寸为1800 m × 350 m × 10m)的co2 HNP过程进行了数值模拟,以评估其提高采收率、CO 2注入能力和CO 2固存能力的潜力。结果表明,实施CO 2 HNP后,累计产油量提高20%以上。同时,致密油储层的CO 2 HNP被证明能够实现超过4×10 7 SCm 3的CO 2注入和超过5×10 6 SCm 3的CO 2储存。我们设计了3种CO 2 HNP方案,发现最大的CO 2储存量并不出现在石油生产的最佳方案中。需要建立一种考虑采油和储油能力的新型CO 2 HNP评价体系。研究结果表明,CO 2 HNP可实现致密储层增产和CO 2封存,对环境保护的可持续发展具有积极意义。
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引用次数: 0
Prior Knowledge-guided Hierarchical Action Quality Assessment with 3D Convolution and Attention Mechanism 基于三维卷积和注意机制的先验知识引导分层动作质量评估
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012027
Haoyang Zhou, Teng Hou, Jitao Li
Abstract Recently, there has been a growing interest in the field of computer vision and deep learning regarding a newly emerging problem known as action quality assessment (AQA). However, most researchers still rely on the traditional approach of using models from the video action recognition field. Unfortunately, this approach overlooks crucial features in AQA, such as movement fluency and degree of completion. Alternatively, some researchers have employed the transformer paradigm to capture action details and overall action integrity, but the high computational cost associated with transformers makes them impractical for real-time tasks. Due to the diversity of action types, it is challenging to rely solely on a shared model for quality assessment of various types of actions. To address these issues, we propose a novel network structure for AQA, which is the first to integrate multi-model capabilities through a classification model. Specifically, we utilize a pre-trained I3D model equipped with a self-attention block for classification. This allows us to evaluate various categories of actions using just one model. Furthermore, we introduce self-attention mechanisms and multi-head attention into the traditional convolutional neural network. By systematically replacing the last few layers of the conventional convolutional network, our model gains a greater ability to sense the global coordination of different actions. We have verified the effectiveness of our approach on the AQA-7 dataset. In comparison to other popular models, our model achieves satisfactory performance while maintaining a low computational cost.
最近,在计算机视觉和深度学习领域中出现了一个新兴的问题——动作质量评估(AQA),引起了人们越来越多的兴趣。然而,大多数研究人员仍然依赖于传统的方法,使用视频动作识别领域的模型。不幸的是,这种方法忽略了AQA中的关键功能,如动作流畅性和完成度。另外,一些研究人员已经采用变压器范例来捕获动作细节和整体动作完整性,但是变压器相关的高计算成本使得它们不适合实时任务。由于行动类型的多样性,仅依靠共享模型对各种类型的行动进行质量评估是具有挑战性的。为了解决这些问题,我们提出了一种新的AQA网络结构,这是第一个通过分类模型集成多模型功能的网络结构。具体来说,我们利用预先训练的I3D模型配备了一个自注意块进行分类。这允许我们仅使用一个模型来评估各种类型的操作。此外,我们在传统卷积神经网络中引入了自注意机制和多头注意机制。通过系统地替换传统卷积网络的最后几层,我们的模型获得了更大的能力来感知不同动作的全局协调。我们已经在AQA-7数据集上验证了我们方法的有效性。与其他流行的模型相比,我们的模型在保持较低的计算成本的同时取得了令人满意的性能。
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引用次数: 0
Optimization of an Air-cooling Thermal Management System for Lithium-ion Battery Packs via Particle Swarm Algorithm 基于粒子群算法的锂离子电池组风冷热管理系统优化
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012006
Wenbo Wu
Abstract Recently, lithium-ion batteries have attracted many researchers and their safety issues such as overheating, combustion and explosion continue to further limit battery application scenarios. These issues are mainly caused by unoptimized battery structure parameters or cooling methods. In this paper, an integrated approach has been proposed to design an efficient air-cooling system using the particle swarm algorithm to find an optimal relationship between air flow rate and battery temperature. Firstly, this method can adjust an optimized air flow rate to ensure that the battery temperature is minimized with the lowest energy consumption via the particle swarm algorithm. Additionally, an optimized air flow rate can still be obtained with the change of structure parameters such as the radius in a lithium-ion battery pack via this novel algorithm. Then, we demonstrate the feasibility of this integrated method in simulations. Compared with the previous work, this method can employ the continuous modulation of the particle swarm algorithm, realizing both the best cooling capacity of the battery cooling system and simultaneously the lowest energy consumption for cooling in cell heat regulation systems. Meanwhile, temperature variations of the entire cell pack are also shown in simulations. In contrast to previous approaches, this integrated method may provide more dynamic thermal management inspirations for designing novel battery thermal management systems.
近年来,锂离子电池吸引了众多研究者,其过热、燃烧和爆炸等安全问题不断进一步限制电池的应用场景。这些问题主要是由未优化的电池结构参数或冷却方法引起的。本文提出了一种采用粒子群算法设计高效风冷系统的综合方法,以寻找空气流量与电池温度之间的最优关系。首先,该方法通过粒子群算法调整优化后的空气流速,以保证电池温度最小、能耗最低;此外,该算法还可以在锂离子电池组半径等结构参数变化的情况下获得最优的空气流速。通过仿真验证了该方法的可行性。与以往的工作相比,该方法可以利用粒子群算法的连续调制,实现电池散热系统的最佳散热能力,同时实现电池散热系统的最低散热能耗。同时,模拟显示了整个电池组的温度变化。与以前的方法相比,这种集成方法可以为设计新型电池热管理系统提供更多动态热管理灵感。
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引用次数: 0
Research on safety issues and safety analysis of new energy aircraft 新能源飞机安全问题研究与安全分析
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012006
Tang Chu, Li Zhongyang, Wang Libo
Abstract As the global aviation industry faces increasing pressure on the environment, the International Civil Aviation Organization (ICAO) has implemented increasingly strict requirements for aircraft carbon emissions. The adoption of innovative energy technologies, such as electric power, hydrogen fuel, and sustainable biofuels in the aviation sector, will enable us to achieve zero carbon emission targets and mitigate environmental pollution associated with air transportation. Drawing on statistical data of aviation accidents, this paper analyses the primary causes of flight mishaps and summarizes several safety issues faced by new energy aircraft. Based on these, the new energy aircraft is divided into several subsystems, including power system, energy system, flight control system and so on. Then, safety analysis tools and methods are then used to conduct an analysis of the aircraft’s safety, with the aim of improving overall safety.
随着全球航空业面临越来越大的环境压力,国际民航组织(ICAO)对飞机碳排放的要求越来越严格。航空领域采用创新能源技术,如电力、氢燃料和可持续生物燃料,将使我们能够实现零碳排放目标,并减轻与航空运输相关的环境污染。本文根据航空事故统计数据,分析了飞行事故的主要原因,总结了新能源飞机面临的几个安全问题。在此基础上,将新能源飞机分为动力系统、能源系统、飞控系统等几个子系统。然后,使用安全分析工具和方法对飞机的安全性进行分析,以提高整体安全性。
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引用次数: 0
Design of Automatic Insect Trap Hypothenemus hampei Ferr. based on Solar Cells as a Source of Stinging Energy 自动捕虫器的设计。基于太阳能电池作为刺痛能量的来源
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012010
R E Rachmanita, S Anggraini, M I R Apriadana
Abstract One of the plant-disturbing organisms that always harms coffee plants is the insect Hypothenemus hampei Ferr. which causes fruit borer attacks. This study aims to design a solar panel-based H. hampei trapper. This tool is designed to work automatically according to the settings on the solar charge controller; it can catch H. hampei effectively; this tool has a low current (DC) that is safe for farmers; this tool can be used in plantation areas far from PLN because the source of electrical energy comes from solar cells; maintenance costs are relatively cheap, but the tool is designed to operate in the long term. The H. hampei trap uses solar panels as an energy source and is equipped with a stinger that works automatically by utilizing the solar charge controller feature. The functional test results show that the tool that has been designed can work well according to the plan made. The average consumption of stingers is 23.70 Wh. The average panel energy yield is 26.85 Wh. The panels’ energy output has exceeded the amount of energy the stingers need. The tool is designed to trap H. hampei well.
摘要对咖啡植物造成危害的害虫之一是hampei Ferr。这就导致了水果蛀虫的袭击。本研究旨在设计一种基于太阳能电池板的汉贝捕集器。该工具根据太阳能充电控制器上的设置自动工作;能有效捕获汉贝氏弧菌;该工具具有低电流(DC),对农民安全;该工具可以在远离PLN的种植区使用,因为电能来源来自太阳能电池;维护成本相对便宜,但该工具设计用于长期运行。H. hampei捕集器使用太阳能电池板作为能源,并配备了一个推力杆,该推力杆通过利用太阳能充电控制器功能自动工作。功能测试结果表明,所设计的工具能够很好地按照所制定的方案工作。推力杆的平均消耗为23.70 Wh。平均面板发电量为26.85 Wh。面板的能量输出已经超过了推力杆所需的能量。该工具设计用于捕获H. hampei井。
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引用次数: 0
Could Physics Teachers Also Have Misconceptions on Basic Kinematics? 物理教师对基本运动学也会有误解吗?
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012025
S Admoko, None Suliyanah
Abstract The role of a physics teacher in learning is to facilitate student activities to construct correct conceptual understanding as that of a scientist. As the primary source of knowledge for students, a physics teacher is required to have the right concept, but this demand is not necessarily fully fulfilled. This study aims to determine the profile of physics teachers’ understanding of concepts on kinematics material detected by a four-tier misconception test. Participants in this study were 20 high school physics teachers in Surabaya. Based on the results of data analysis, it was found that the dominant misconceptions included: (1) Two objects that make the same displacement at the same time interval will have the same velocity, regardless of the type of movement of the two objects (2) Objects that move vertically straight up or down will always have the acceleration of motion equal to the acceleration of gravity which is directed downwards. (3) As long as the object’s position is at positive coordinates, it means the object is moving in the forward direction. (4) The graph of velocity against time, which has a positive gradient, means that the object always moves forward (5) In parabolic motion, the length of time an object is in the air only depends on the length of its path, the longest path will require the longest time. (6) In parabolic motion, the final speed of an object when it lands on the ground depends not only on its initial speed but also on its elevation angle. The findings of several misconceptions above show that even a physics teacher cannot escape misconceptions. Therefore, it is crucial for a teacher to be able to remedy the misconceptions he suffers so that these misconceptions are not transmitted to the students he teaches. This finding is the first step for researchers to detect misconceptions, followed by the application of certain learning methods to remedy misconceptions in future research.
物理教师在学习中的作用是促进学生建构正确概念理解的活动,就像科学家的作用一样。作为学生知识的主要来源,物理教师需要有正确的概念,但这一要求并不一定得到充分满足。本研究旨在通过四层误解测验来确定物理教师对运动学材料概念的理解概况。本研究以泗水市20名高中物理教师为研究对象。根据数据分析结果发现,主要的误解包括:(1)在同一时间间隔内进行相同位移的两个物体,无论两个物体的运动类型如何,其速度都是相同的;(2)垂直向上或向下运动的物体,其运动加速度总是等于向下运动的重力加速度。(3)只要物体的位置处于正坐标,就表示物体在向前运动。(5)在抛物线运动中,物体在空中停留的时间长短只取决于其路径的长度,路径最长的物体需要的时间最长。在抛物运动中,物体落地时的最终速度不仅取决于物体的初始速度,而且还取决于物体的仰角。以上几个误解的发现表明,即使是物理教师也无法摆脱误解。因此,对于一个老师来说,能够纠正他所遭受的误解是至关重要的,这样这些误解就不会传播给他所教的学生。这一发现是研究人员发现误解的第一步,随后在未来的研究中应用某些学习方法来纠正误解。
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引用次数: 0
Study of Performance Graphene Oxide Modification of LiFePO4/C Material for The Cathode of Li-Ion Batteries 锂离子电池正极材料LiFePO4/C性能氧化石墨烯改性研究
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012014
N H Hana, None Munasir
Abstract The need for energy storage is increasing rapidly along with technological development. Lithium ion batteries are one of the energy storages that are in great demand due to their high specific capacity and energy density, discharge voltage of 3.4 volts, and environmental friendliness. LiFePO 4 is a lithium-ion battery cathode material with a high specific capacity of 170 mAh/g and a discharge voltage of about 3.4 V, thermal stability, high energy density, environmentally friendly, and easy to obtain. However, it has low electrical conductivity and poor ion diffusion, which hinders energy storage. Carbon modification is a method that has the advantage of reducing particle size and preventing agglomeration in nanoparticles, so this method is widely researched to improve lithium ion diffusion coefficient and conductivity in lithium ion batteries. This study aims to describe the effect of GO modification on the characterization of LiFePO 4 /C-GO composite material and LiFePO 4 /C-GO composite material battery performance as a lithium ion battery cathode material. In this study, it can be seen that the addition of GO in LiFePO 4 cathode material can improve battery performance. The LiFePO 4 /C-GO-10 cathode obtained the most effective results with the lowest Rct value of 95.21 Ω and the highest conductivity value of 14.3×10- 6 S/cm indicating the best electron transport. The Rct value decreased with the addition of GO, and the conductivity value increased with the addition of GO.
随着技术的发展,对储能的需求也在迅速增加。锂离子电池具有比容量高、能量密度大、放电电压3.4伏、环境友好等优点,是目前需求量很大的储能系统之一。lifepo4是一种锂离子电池正极材料,比容量高达170 mAh/g,放电电压约3.4 V,热稳定,能量密度高,环保,易于获得。然而,它的导电性低,离子扩散差,阻碍了能量的储存。碳改性是一种具有减小颗粒尺寸和防止纳米颗粒团聚等优点的方法,因此该方法被广泛研究以提高锂离子电池中锂离子的扩散系数和电导率。本研究旨在描述GO改性对lifepo4 /C-GO复合材料表征及lifepo4 /C-GO复合材料作为锂离子电池正极材料电池性能的影响。在本研究中可以看出,在lifepo4正极材料中加入GO可以提高电池的性能。lifepo4 /C-GO-10阴极效果最好,Rct值最低,为95.21 Ω,电导率最高,为14.3×10- 6 S/cm,显示出最佳的电子传递。Rct值随氧化石墨烯的加入而减小,电导率值随氧化石墨烯的加入而增大。
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引用次数: 0
Analysis and Suppression of Thrust Fluctuations in Halbach-type Permanent Magnet Synchronous Linear Motors halbach型永磁同步直线电机推力波动分析与抑制
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012017
Gixian Cheng, Shuhua Wang
Abstract To address the thrust fluctuation problem of a bilateral type permanent magnet synchronous linear motor (DSPMSLM) with a Halbach permanent magnet array, a DSPMLSM with Halbach permanent magnet array structure is designed using ANSYS software. And based on this motor, the thrust fluctuations of the DSPMLSM are suppressed by using methods such as changing the end tooth height of the armature core, the tooth slot structure, and the opening of an auxiliary slot in the primary yoke. Firstly, the causes of thrust fluctuations in these areas were analyzed. Secondly, MAXWELL simulations were used to demonstrate that the selection of a suitable end tooth height could suppress end forces and that the use of a suitable-sized half-open slot and an auxiliary slot in the primary yoke could effectively reduce slot forces. All three methods can be used to suppress motor thrust fluctuations, reducing the thrust fluctuations of the DSPMLSM from 11.4% to 3.28% and increasing the average output thrust, which provides a reference for further optimization of the output performance of the linear motor.
摘要针对双边永磁同步直线电机(DSPMSLM)的推力波动问题,利用ANSYS软件设计了双边永磁同步直线电机(DSPMSLM)的Halbach永磁阵列结构。在此基础上,通过改变电枢铁心端齿高度、齿槽结构和主轭副齿槽的开度等方法抑制了电机的推力波动。首先,分析了这些地区推力波动的原因。其次,通过MAXWELL仿真验证了选择合适的端齿高度可以抑制端齿力,在主轭架中使用合适尺寸的半开槽和辅助槽可以有效减小端齿力。三种方法均可抑制电机推力波动,使DSPMLSM的推力波动从11.4%降至3.28%,提高了平均输出推力,为进一步优化直线电机的输出性能提供了参考。
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引用次数: 0
Archimedean Screw Based Micro Hydro Power Plant (MHPP) Prototype with Turbine Elevation Angle Parameters 阿基米德螺旋微型水力发电厂(MHPP)原型与水轮机仰角参数
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2623/1/012026
B Indarto, D N Kumalasari, M A Bustomi
Abstract Electrical energy has a very important role in human life, but the electricity supply still needs to meet society’s needs fully. Many potential energy resources can be converted into electrical energy. One of the potential energy resources is the flow of water, which can be used for micro-hydro power plants in remote areas. This paper presents the results of an analysis of a prototype Micro Hydro Power Plant (MHPP) using a 3-blade turbine with a gearbox ratio of 2.8:1. The purpose of the analysis is to determine the greatest value of voltage, current, power, rpm, torque, and efficiency based on variations in the angle of the turbine tilt of 20°, 25°, 30°, and 35° at a water debit of 2.91 l/s and a generator in the form of BLDC 3 phase. The measurement results and data analysis found that the turbine tilt angle of 20° produced the greatest voltage, rpm, torque, and efficiency values. This is because the increase in the angle of inclination of the turbine results in an addition to the volume of the bucket so that the speed of the water flow in the turbine increases. As a result of the addition of this water flow, the turbine becomes heavier to rotate so that the efficiency value decreases.
摘要:电能在人类生活中有着非常重要的作用,但电力供应仍需充分满足社会的需求。许多势能资源可以转化为电能。其中一种潜在的能源是水流,可以用于偏远地区的微型水力发电厂。本文介绍了采用齿轮箱传动比为2.8:1的三叶片水轮机的微型水力发电厂(MHPP)样机的分析结果。分析的目的是确定电压、电流、功率、转速、转矩和效率的最大值,根据水轮机倾斜角度的变化为20°、25°、30°和35°,用水量为2.91 l/s,发电机形式为BLDC 3相。测量结果和数据分析发现,涡轮倾角为20°时产生的电压、转速、转矩和效率值最大。这是因为水轮机倾斜角的增加导致桶的体积增加,从而使水轮机内水流的速度增加。由于水流的增加,涡轮变得更重来旋转,从而使效率值降低。
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引用次数: 0
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Journal of Physics-Photonics
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