Microgravity Science and Technology最新文献_第9页

Efficacy of the Random Positioning Machine as a Terrestrial Analogue to Microgravity in Studies of Seedling Phototropism 随机定位机在地球模拟微重力条件下幼苗向光性研究中的效果

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-14 DOI: 10.1007/s12217-023-10066-9

Ariel M. Hughes, Joshua P. Vandenbrink, John Z. Kiss

{"title":"Efficacy of the Random Positioning Machine as a Terrestrial Analogue to Microgravity in Studies of Seedling Phototropism","authors":"Ariel M. Hughes, Joshua P. Vandenbrink, John Z. Kiss","doi":"10.1007/s12217-023-10066-9","DOIUrl":"10.1007/s12217-023-10066-9","url":null,"abstract":"<div><p>The future of space exploration will be contingent upon the use of plants in bioregenerative life support systems. Unfortunately, the microgravity of space can cause stress in plants, which can reduce growth. The Random Positioning Machine, RPM, is a device designed to provide an analogue for the effects of microgravity on Earth by rotating specimens in three dimensions. In this study, we compare the results from experiments conducted on the International Space Station with those conducted using the RPM (in the 3D clinostat mode) on the ground. Seedlings of <i>Arabidopsis thaliana</i> wildtype and phytochrome mutants were grown in true microgravity and in the omnidirectional gravity on a rotating RPM on the ground. We found that the RPM treatment caused less stress in the seedlings than did true microgravity. We also report that phytochromes A and B play roles in phototropic responses to unilateral light and that these roles differ in the two gravitational environments. Finally, we conclude that while root phototropism in unilateral red and blue differs significantly between the microgravity and omnidirectional stimuli, the RPM can serve as a reasonable analogue of microgravity conditions for assessment of shoot phototropism.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85180042","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

Numerical Modeling of the Influence of Gas Diffusion Layer Properties on Liquid Water Transport and Transient Responses in a Proton Exchange Membrane Fuel Cell 质子交换膜燃料电池中气体扩散层性质对液态水输运及瞬态响应影响的数值模拟

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-09 DOI: 10.1007/s12217-023-10067-8

Faycel Khemili, Mustapha Najjari

引用次数: 0

Impact of the Shape Factor on Combined Buoyancy and Marangoni Convection in a Hybrid Nanofluid Filled Cylindrical Porous Annulus 形状因子对混合纳米流体填充圆柱形多孔环空中浮力和Marangoni对流的影响

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-05 DOI: 10.1007/s12217-023-10065-w

B. Kanimozhi, M. Muthtamilselvan, Ziyad A. Alhussain

引用次数: 0

Investigation of the Dynamics of a Coating Flow on a Vertical Fiber Immersed in Surrounding Liquid Phase 垂直光纤在周围液相中的涂层流动动力学研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-01 DOI: 10.1007/s12217-023-10064-x

Yufeng Zhang, Rong Liu, Xue Chen

引用次数: 0

Investigation of the Dynamics of a Coating Flow on a Vertical Fiber Immersed in Surrounding Liquid Phase 垂直光纤在周围液相中的涂层流动动力学研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-08-01 DOI: 10.1007/s12217-023-10064-x

Yufeng Zhang, Rong Liu, Xue Chen

引用次数: 0

Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters 利用冷-气推力器对北京落塔进行10 - 3 ~ 10−5g微重力调整

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-25 DOI: 10.1007/s12217-023-10060-1

Chu Zhang, Chao Yang, L. Hu, Shuyang Chen, Yifan Zhao, L. Duan, Qi Kang

引用次数: 0

Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters 利用冷-气推力器对北京落塔进行10 - 3 ~ 10−5g微重力调整

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-25 DOI: 10.1007/s12217-023-10060-1

Chu Zhang, Chao Yang, Liang Hu, Shuyang Chen, Yifan Zhao, Li Duan, Qi Kang

{"title":"Beijing Drop Tower Microgravity Adjustment Towards 10–3 ~ 10−5g Level by Cold-Gas Thrusters","authors":"Chu Zhang, Chao Yang, Liang Hu, Shuyang Chen, Yifan Zhao, Li Duan, Qi Kang","doi":"10.1007/s12217-023-10060-1","DOIUrl":"10.1007/s12217-023-10060-1","url":null,"abstract":"<div><p>Drop tower is an important facility for conducting microgravity experiments on the ground. Since the Beijing drop tower was put into operation in 2003, a large number of scientific experiments have been carried out in the fields of microgravity fluid physics, combustion, materials science and fundamental physics. The drop tower has two operation modes: single capsule falling and double capsule falling, with the microgravity levels reaching 10<sup>−2</sup>g ~ 10<sup>−3</sup>g and 10<sup>−5</sup>g respectively. In order to meet the demand of multi-level microgravity levels in ground microgravity experiments, a double capsule microgravity level control system based on the cold-gas micro thruster is developed. The micro thrusters are mounted in the inner capsule of the double capsule system. During the fall of the double capsule, the cold-gas micro thrusters thrust in the opposite direction of the movement of the structure, which increases the resistance of the inner capsule to realize the control of microgravity level. The measurement results of the high-precision accelerometer show that the 10<sup>–3</sup> ~ 10<sup>−5</sup>g microgravity level can be controlled by this system.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117619969","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

Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity 振荡腔内壁面附近固体运动的实验研究

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-07 DOI: 10.1007/s12217-023-10062-z

O. A. Vlasova, V. G. Kozlov

{"title":"Experimental Study of the Solid Motion in the Vicinity of the Wall in an Oscillating Cavity","authors":"O. A. Vlasova, V. G. Kozlov","doi":"10.1007/s12217-023-10062-z","DOIUrl":"10.1007/s12217-023-10062-z","url":null,"abstract":"<div><p>The dynamics of spherical and cylindrical bodies in the vicinity of the cylindrical wall of the cavity filled with fluid under rotational oscillations is experimentally studied. We consider (i) the motion of a light spherical body inside a cylinder under rotational oscillations and (ii) the motion of the heavy cylindrical body in a horizontal cavity under modulated rotation. In the absence of the oscillations, the bodies are pressed against the cavity walls due to the action of (i) the buoyant force and (ii) the centrifugal force. The tangential and rotational body oscillations are studied by means of video registration. It is found that the body oscillations induce the averaged lift force that is responsible for the detachment of the body from the wall at the critical value of the amplitude of the body oscillations. The oscillation-induced repulsive force is measured by the method of the body suspension in a static field of (i) gravitational force or (ii) centrifugal force. It is found that the dimensionless lift force decreases with the distance from the wall according to the exponential law. The magnitude of the lift force is determined only by the amplitude of the velocity of the tangential body oscillation relative to the surrounding fluid while the intensity of the rotational body oscillations is of no importance. Also, the lift force does not depend on the distance to the wall and increases with the dimensionless frequency ω in the studied range ω = 10 – 90. The phenomenon of the oscillation-induced repulsion of the solid from the cavity wall is of interest for the development of an effective method for the control of multiphase media under microgravity conditions.\u0000</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4305243","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

Clarifying the Vital Role of Fluid Type in Diffusion through Complex Porous Media under Apparently Weak but Essentially Powerful Force of Gravity by Simulations Performed Using Image Processing Technique and D3Q27 Model of Lattice Boltzmann Method 利用图像处理技术和晶格玻尔兹曼法 D3Q27 模型进行模拟，阐明流体类型在表面微弱但本质强大的重力作用下通过复杂多孔介质进行扩散时的重要作用

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-05 DOI: 10.1007/s12217-023-10063-y

Hamid Zahedi, Mohammad Vakili

{"title":"Clarifying the Vital Role of Fluid Type in Diffusion through Complex Porous Media under Apparently Weak but Essentially Powerful Force of Gravity by Simulations Performed Using Image Processing Technique and D3Q27 Model of Lattice Boltzmann Method","authors":"Hamid Zahedi, Mohammad Vakili","doi":"10.1007/s12217-023-10063-y","DOIUrl":"10.1007/s12217-023-10063-y","url":null,"abstract":"<div><p>In this study, the vital role of fluid type in diffusion through a complex soil-like three-dimensional porous medium under gravity force was investigated by simulations performed using D3Q27 model of Lattice Boltzmann Method (LBM), with Double Relaxation Time (DRT) procedure as well as second-order discretization version of LBM. The elaborate porous medium was constructed using Image Processing technique by a detailed program written in MATLAB language. The hydrogen gas and water vapor were two fluids utilized in this project and because of small velocity of fluid, the Darcy law (with inclusion of gravity) was used extensively. Also, the satisfaction of continuity equation in different cross sections of porous medium was examined for both fluids; velocity and pressure contours were utilized also in this regard. The critical point of value of gravity acceleration <i>g</i> in LBM scale for different fluids was described and <i>g</i><sub><i>LBM</i></sub> was calculated for 13 fluids to emphasize the vital role of fluid type in LBM simulations. For being confident regarding the role of gravity, the value of gravity acceleration was set to zero intentionally (|<i>g</i>| =|<i>g</i><sub><i>LBM</i></sub>|= 0) in some other simulations. Because of complex nature of porous medium, the inclusion of Knudsen diffusion phenomenon in calculations of pressure change was necessary. After coupling of Darcy equation with Knudsen diffusion according to valid scientific resources, the calculation of permeability and mean pore diameter of porous medium was accomplished through special three-dimensional fitting by MATLAB. The interesting concept of Specific Surface Area (SSA) was introduced, too.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4216422","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

Dissipative Structures of Marangoni Convection in a Thin Layer of liquid with Lattice of Localized and Continuously Distributed Heat Sources and Sinks 具有局部连续分布热源和汇晶格的薄层液体中Marangoni对流的耗散结构

IF 1.8 4区工程技术

Microgravity Science and Technology Pub Date : 2023-07-03 DOI: 10.1007/s12217-023-10061-0

Igor I. Wertgeim, Vadim A. Sharifulin, Albert N. Sharifulin

{"title":"Dissipative Structures of Marangoni Convection in a Thin Layer of liquid with Lattice of Localized and Continuously Distributed Heat Sources and Sinks","authors":"Igor I. Wertgeim, Vadim A. Sharifulin, Albert N. Sharifulin","doi":"10.1007/s12217-023-10061-0","DOIUrl":"10.1007/s12217-023-10061-0","url":null,"abstract":"<div><p>The three-dimensional solutions of nonlinear long-wavelength approximations for the problem of Marangoni convection in a thin horizontal layer of a viscous incompressible fluid with a free surface is being considered. The temperature distribution in the liquid corresponds to a uniform vertical gradient distorted by the imposition of a weakly inhomogeneous heat flux localized in the horizontal plane, caused by a lattice of either localized or continuously distributed heat sources and sinks. The lower boundary of the layer is solid and thermally insulated, while the upper one is free and deformable. The statement of the problem is motivated by the search for ways to control convection structures. The problem in long-wave approximation is described by a system of nonlinear transport equations for the amplitudes of temperature distribution and surface deformation. The numerical solution of the problem is based on the pseudospectral method. The dynamics of non-stationary dissipative structures is considered.\u0000</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-023-10061-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471566","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