Microgravity Science and Technology最新文献_第2页

Inertial Wave Attractors in Librating Cylinders: Axisymmetric versus Nonaxisymmetric Ends 振动圆柱体中的惯性波吸引子：轴对称端与非轴对称端

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-02-12 DOI: 10.1007/s12217-025-10164-w

Stanislav Subbotin, Mariya Shiryaeva

{"title":"Inertial Wave Attractors in Librating Cylinders: Axisymmetric versus Nonaxisymmetric Ends","authors":"Stanislav Subbotin, Mariya Shiryaeva","doi":"10.1007/s12217-025-10164-w","DOIUrl":"10.1007/s12217-025-10164-w","url":null,"abstract":"<div><p>Inertial waves in a rotating confined fluid can focus on closed trajectories, known as wave attractors. These regimes are not eigenmodes and are related only to the frequency dependence of the wave vector. This paper presents an experimental investigation of the cylindrical cavity shape’s effect on the attractor’s spatial structure. We considered three different configurations: i) a circular cylinder with both conical axisymmetric ends; ii) a cylinder with one straight end and the other end inclined to the plane of the cross-section; iii) both ends of the cylinder are inclined parallel. The major observed difference is the azimuthal flow structure. In the axisymmetric case, the shape of the wave attractor is independent of the azimuthal coordinate, and the instantaneous vorticity field represents a system of nested rings in the cross-section. If one of the cavity ends has a constant slope, wave focusing appears in the meridional plane passing near the direction specified by the geometry. The three-dimensional law of wave reflection from inclined boundaries causes meridional trapping, which is important in real geo- and astrophysical systems with complex boundary topography.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical Processing of Melting PCM Bridges in Microgravity Using SVD and ANNs 基于奇异值分解和神经网络的微重力熔化PCM桥的光学处理

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-02-11 DOI: 10.1007/s12217-025-10166-8

Pablo Salgado Sánchez, Fernando Varas, Jeff Porter, Dan Gligor

{"title":"Optical Processing of Melting PCM Bridges in Microgravity Using SVD and ANNs","authors":"Pablo Salgado Sánchez, Fernando Varas, Jeff Porter, Dan Gligor","doi":"10.1007/s12217-025-10166-8","DOIUrl":"10.1007/s12217-025-10166-8","url":null,"abstract":"<div><p>Both Singular Value Decomposition (SVD) and Artificial Neural Networks (ANNs) can be powerful tools for image processing. Here they are applied in the context of the “Effect of Marangoni Convection on Heat Transfer in Phase Change Materials” (MarPCM) microgravity experiment [Porter et al. (Acta Astronautica 210, 212–223, 2023)], which investigates the use of thermocapillary (Marangoni) convection to expedite melting of organic Phase Change Materials (PCMs) in cuboidal and cylindrical domains. The processing of the cylindrical “melting bridge” experimental images is particularly challenging due to the converging lens effect caused by the curved interface and the refractive index of the liquid PCM. A combination of SVD and ANNs is used to propose an algorithm to process these images. The network is trained on a set of synthetic images of the melting bridge, generated via ray-tracing [Martinez et al. (Advances in Space Research 72, 1915–1928, 2023)] then projected onto the eigenmodes associated with the largest singular values of the image database, which includes snapshots of the melting process in all representative cases. Two optimal algorithm architectures are described, characterized by the number of SVD modes considered in the projection and the hyperparameters of the ANN. The performance of the algorithm is analyzed in terms of its ability to associate images with the correct liquid fraction. The processing strategy is tested by applying it to images obtained from ground experiments using the scientific prototype of the MarPCM cuboidal cell.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-025-10166-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Inhibitory Potential Effects of Polysaccharide Peptide from Coriolus versicolor on the Growth and Metastasis of 4T1 Breast Tumors Under Simulated Microgravity Conditions 模拟微重力条件下花斑茅多糖肽对4T1乳腺肿瘤生长和转移的抑制作用

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-02-10 DOI: 10.1007/s12217-025-10167-7

Morteza Alemi, Firooz Samadi, Alireza Madjid Ansari, Zahra Hajebrahimi

{"title":"The Inhibitory Potential Effects of Polysaccharide Peptide from Coriolus versicolor on the Growth and Metastasis of 4T1 Breast Tumors Under Simulated Microgravity Conditions","authors":"Morteza Alemi, Firooz Samadi, Alireza Madjid Ansari, Zahra Hajebrahimi","doi":"10.1007/s12217-025-10167-7","DOIUrl":"10.1007/s12217-025-10167-7","url":null,"abstract":"<div><p>The form of cancer that is prevalent among women is breast cancer and is responsible for a significant number of cancer-related deaths. Coriolus versicolor (CV) extract has demonstrated notable anti-cancer properties. Additionally, microgravity can influence various aspects of cancer cell behavior, including growth, migration, proliferation, survival, and apoptosis. This research aimed to assess the efficacy of polysaccharide peptide from CV in combination with doxorubicin under simulated microgravity (S-µg) conditions and without S-µg on 4T1 cancer cells. A number of 80 female inbred BALB/c mice were divided into 8 experiment groups, including Control, polysaccharide peptide from CV (T, 1 g/kg BW), doxorubicin injection (Dox, 0.5 mg/kg BW), Dox + T, S-µg (Mic), Mic + D, Mic + T, and Mic + D + T. Subsequently, tumor biomarkers and cell death were expressed using Western blot, TUNEL assay, immunohistochemistry, and H&E staining techniques. Exposure to S-µg reduced tumor growth compared to the control group, but its effect was less than that of the groups affected by polysaccharide peptide from CV and Dox. The Dox and CV combination could significantly (<i>p</i> < 0.001) inhibit 4T1 breast tumors’ growth. The Dox + T group exhibited a decrease in the tumors’ volume compared to control (<i>p</i> < 0.001). Meanwhile, it could effectively suppress tumor growth and Ki-67, VEGF, MMP-2, and MMP-9 expression. Also, Dox + T could increase the mean survival time of the tumor-bearing mice. Dox + T demonstrated a meaningful increase in cleavage of caspase-3, caspase-8, and caspase-9, confirming the occurrence of apoptosis (<i>p</i> < 0.001). Taking together, Dox + T can be a safe anti-cancer supplement that can cause direct apoptosis to the cancer cells.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microgravity Control of a Free Surface in Elliptical Containers Via Thermocapillary Flows 热毛细管流动对椭圆容器自由表面的微重力控制

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-02-07 DOI: 10.1007/s12217-025-10165-9

Ignacio Jiménez Blanco, Pablo Salgado Sánchez, Dan Gligor, Andriy Borshchak Kachalov, Ali Arshadi

{"title":"Microgravity Control of a Free Surface in Elliptical Containers Via Thermocapillary Flows","authors":"Ignacio Jiménez Blanco, Pablo Salgado Sánchez, Dan Gligor, Andriy Borshchak Kachalov, Ali Arshadi","doi":"10.1007/s12217-025-10165-9","DOIUrl":"10.1007/s12217-025-10165-9","url":null,"abstract":"<div><p>We present here an extensive analysis of the free surface dynamics driven by the thermocapillary effect in half-filled elliptical containers in microgravity. Depending on the cell ellipticity <span>(delta )</span>, which selects the preferred static equilibrium via surface energy, and on the applied thermal forcing <span>(Delta T)</span>, interesting dynamics are found. Simulations show that the steady, thermally-driven position of the interface — perpendicular to <span>(Delta T)</span> — undergoes a pitchfork bifurcation at a critical <span>(delta _textrm{cr})</span> that breaks the vertical reflection symmetry of the system. These results are supported by (leading order) estimates of the opposing thermocapillary and surface tension forces, predicting the linear dependence of <span>(delta _textrm{cr})</span> on <span>(Delta T)</span>. Finally, the free surface relaxation after switching off the thermal control is explored. As a whole, the present analysis indicates that one can combine thermocapillary flows and an adequate cell design to manipulate and control fluids in microgravity, with potential in a wide variety of applications.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-025-10165-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experiment on the Dynamics of a Thin Film Flow Coating on an Inclined Fiber 倾斜光纤上薄膜流动涂层的动力学实验

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-31 DOI: 10.1007/s12217-025-10161-z

Mingjie Guo, Zhiyi Liang, Xue Chen, Ruizhi Li, Rong Liu

引用次数: 0

Design and Modeling of a Self-Sensing Micro-Vibration Isolation System Utilizing a Lightweight Electret-Based Transducer for Space Applications 空间应用轻型驻极体传感器自感微振动隔离系统的设计与建模

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-28 DOI: 10.1007/s12217-024-10157-1

Chao Dong, Zhaoshu Yang, Zhenkun Guo, Guoping Liu, Minzheng Sun

引用次数: 0

Determination of the Electric Field by Particle Tracking in a Plasma Sheath Region during Free Fall 用粒子跟踪法测定自由落体等离子体鞘层区域的电场

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-23 DOI: 10.1007/s12217-025-10162-y

Andreas S. Schmitz, Luisa Hanstein, Max Klein, Michael Kretschmer, Christoph Lotz, Aleksandr Shemakhin, Markus H. Thoma

引用次数: 0

Evaluating Machine Learning as an Alternative to CFD for Heat Transfer Modeling 评估机器学习作为CFD传热建模的替代方案

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-21 DOI: 10.1007/s12217-025-10163-x

Seyed Hamed Godasiaei, Hossein Ali Kamali

{"title":"Evaluating Machine Learning as an Alternative to CFD for Heat Transfer Modeling","authors":"Seyed Hamed Godasiaei, Hossein Ali Kamali","doi":"10.1007/s12217-025-10163-x","DOIUrl":"10.1007/s12217-025-10163-x","url":null,"abstract":"<div><p>This study investigates the feasibility of replacing computational fluid dynamics (CFD) techniques with machine learning (ML) models for heat transfer modeling, focusing on forced convection processes. The research leverages artificial intelligence algorithms, specifically random forests (RF), super-gradient boosting (SGBoost), and artificial neural networks (ANN), to predict key heat transfer metrics such as Reynolds number, nanoparticle size, volume percentage, and Nusselt number. Using a dataset of 210 data points, the ML models are systematically applied to forecast heat transfer outcomes. Model performance is evaluated using Root Mean Squared Error (RMSE), Pearson’s correlation coefficient (r), and Mean Absolute Error (MAE). Results indicate that SGBoost achieves an accuracy of 91%, RF 90%, and ANN 86%, with corresponding RMSE values of 1.07, 1.65, and 16.1, respectively. These findings demonstrate that ML models not only deliver high accuracy and predictive power but also outperform traditional CFD methods in computational efficiency and adaptability to new data. Unlike conventional techniques that rely on predefined physical models and require extensive computational resources, ML approaches streamline the modeling process and enhance accessibility for diverse engineering applications. This study underscores the transformative potential of ML in advancing thermal analysis and optimizing forced convection heat transfer simulations.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Droplet Impact Upon An Inclined Curved Non-Piezoelectric Substrate Propagating Lamb Waves 液滴对倾斜弯曲非压电基板传播兰姆波的冲击研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-10 DOI: 10.1007/s12217-024-10160-6

Zhaodong Yang, Zichen Wang, Zhijie Zhang, Yang Wang, Wei Liang

引用次数: 0

Experimental Study of Condensation Heat Transfer in Tubes under Centrifugal Force 离心力作用下管内冷凝换热实验研究

IF 1.3 4区工程技术

Microgravity Science and Technology Pub Date : 2025-01-06 DOI: 10.1007/s12217-024-10159-z

Leigang Zhang, Meng Ru, Yonghai Zhang, Guopei Li, Zhenqian Chen, Gang Chen, Xuehong Wu

{"title":"Experimental Study of Condensation Heat Transfer in Tubes under Centrifugal Force","authors":"Leigang Zhang, Meng Ru, Yonghai Zhang, Guopei Li, Zhenqian Chen, Gang Chen, Xuehong Wu","doi":"10.1007/s12217-024-10159-z","DOIUrl":"10.1007/s12217-024-10159-z","url":null,"abstract":"<div><p>In this study, fluid flow during condensation in a tube under different gravity conditions is simulated by utilizing centrifugal force to offset gravitational effects. The role of fins, tube diameter, and steam quality on the two-phase flow pattern, temperature distribution, and pressure drop is investigated. The results show that gravity, tube diameter, and steam quality have a significant effect on the flow pattern. The flow characteristics were also significantly affected by the operating parameters, with undulating and laminar flow dominating, while bubbling flow emerges under specific conditions. In microgravity environments, as steam quality decreases, the temperature drop diminishes progressively compared to normal gravity conditions. Under normal gravity and low flow conditions, the average temperature of finned tubes increased by 7 °C to 16.4 °C relative to bare tube temperatures, and the pressure drop escalated by up to 56%. The introduction of fins notably enhanced heat transfer efficiency and facilitated a more uniform temperature distribution. However, this enhancement in heat transfer was accompanied by an increase in pressure drop due to the heightened resistance to fluid flow caused by the presence of fins. These experimental insights offer a deeper comprehension of fluid behavior under diverse gravity conditions and lay a scientific foundation for designing future thermal management systems.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0