Microgravity Science and Technology最新文献

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Flame Spread and Group-Combustion Excitation in Randomly Distributed Droplet Clouds with Low-Volatility Fuel Near the Excitation Limit: A Percolation Approach Considering the Effect of Droplet Interaction on the Flame-Spread Limit 接近激励极限的低挥发性燃料随机分布液滴云中火焰蔓延和群燃激发:考虑液滴相互作用对火焰蔓延极限影响的渗流方法
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-10-19 DOI: 10.1007/s12217-026-10296-7
Yuka Hara, Masato Mikami
{"title":"Flame Spread and Group-Combustion Excitation in Randomly Distributed Droplet Clouds with Low-Volatility Fuel Near the Excitation Limit: A Percolation Approach Considering the Effect of Droplet Interaction on the Flame-Spread Limit","authors":"Yuka Hara,&nbsp;Masato Mikami","doi":"10.1007/s12217-026-10296-7","DOIUrl":"10.1007/s12217-026-10296-7","url":null,"abstract":"<div><p>Our study employs a percolation approach to describe flame spread and group-combustion excitation in randomly distributed fuel-droplet clouds based on findings obtained from space-based microgravity experiments on the flame-spread limit around interactive droplets. We developed a percolation model in which the flame spreads to droplets existing within the flame-spread-limit distance, which varies depending on the relative positions of two or three flame-spreading droplets. Using 2D- and 3D-percolation models, we investigated the effects of two-droplet and/or three-droplet interaction on the flame spread of randomly distributed droplet clouds and group-combustion excitation. The results show that the critical mean droplet spacing, around which the occurrence probability of group combustion sharply decreases as mean droplet spacing increases, increases with two-droplet interaction both in the 2D- and 3D-percolation models. However, even when three-droplet interaction is taken into account in the 2D-percolation model, the critical mean droplet spacing does not increase to the same extent as it does under two-droplet interaction. The critical mean droplet spacing in the 3D-percolation model is larger than that in the 2D-percolation model. The proportion of droplets ignited solely by droplet interaction relative to the total number of droplets is higher in the 3D-percolation model than in the 2D-percolation model because the increase in dimensionality leads to an increase in the number of droplets ignited solely by droplet interaction.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 6","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214595","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
The Influence of Chemical Potential Differences on the Development of Mass Transfer in Liquid Systems with an Interphase Boundary 化学势差对具有界面边界的液体系统传质发展的影响
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-10-13 DOI: 10.1007/s12217-026-10294-9
M. O. Denisova, K. G. Kostarev, S. V. Torohova
{"title":"The Influence of Chemical Potential Differences on the Development of Mass Transfer in Liquid Systems with an Interphase Boundary","authors":"M. O. Denisova,&nbsp;K. G. Kostarev,&nbsp;S. V. Torohova","doi":"10.1007/s12217-026-10294-9","DOIUrl":"10.1007/s12217-026-10294-9","url":null,"abstract":"<div><p>The effect of the chemical potential difference on the development of diffusion processes in liquid systems with an interfacial boundary was studied experimentally. The study was conducted using the example of mass transfer of a surfactant between a droplet and the surrounding medium. Water and a mixture of benzene and chlorobenzene were selected as the contacting liquids. Acetic acid, which has significantly different solvation energies in water and in the coctacting mixture, was used as the diffusing surfactant. A Fizeau interferometer was used to visualize the flow patterns and concentration fields. It was shown that in liquid systems with an interfacial boundary, the direction and intensity of surfactant diffusion are determined by the difference in chemical potentials between the contacting solutions. A comparison was made of the structures of surfactant concentration fields arising as a result of its diffusion from a droplet or into a droplet, as well as their evolution. Particular attention was paid to the influence of Marangoni convection accompanying the surfactant diffusion process.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189206","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
Deployment of a Biomedical Research Laboratory for Suborbital Spaceflight: the Experience from the Virtute-1 Mission 亚轨道航天生物医学研究实验室的部署:来自virtue -1任务的经验
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-10-03 DOI: 10.1007/s12217-026-10290-z
Laura Guarnaccia, Stefania E. Navone, Simona Ferraro, Laura Begani, Noreen M. Gervasi, Pietro Tondo, Giuseppe Ciniglio Appiani, Pietro Perelli, Angelo Landolfi, Laura Fontana, Giovanni A. Alotta, Leonardo Catamo, Marco Locatelli, Efrem Moioli, Marco Lastilla, Laura Riboni, Gianvincenzo Zuccotti, Emanuele Garzia, Emanuela Barilla, Monica Miozzo, Giovanni Marfia
{"title":"Deployment of a Biomedical Research Laboratory for Suborbital Spaceflight: the Experience from the Virtute-1 Mission","authors":"Laura Guarnaccia,&nbsp;Stefania E. Navone,&nbsp;Simona Ferraro,&nbsp;Laura Begani,&nbsp;Noreen M. Gervasi,&nbsp;Pietro Tondo,&nbsp;Giuseppe Ciniglio Appiani,&nbsp;Pietro Perelli,&nbsp;Angelo Landolfi,&nbsp;Laura Fontana,&nbsp;Giovanni A. Alotta,&nbsp;Leonardo Catamo,&nbsp;Marco Locatelli,&nbsp;Efrem Moioli,&nbsp;Marco Lastilla,&nbsp;Laura Riboni,&nbsp;Gianvincenzo Zuccotti,&nbsp;Emanuele Garzia,&nbsp;Emanuela Barilla,&nbsp;Monica Miozzo,&nbsp;Giovanni Marfia","doi":"10.1007/s12217-026-10290-z","DOIUrl":"10.1007/s12217-026-10290-z","url":null,"abstract":"<div><p>Suborbital spaceflight platforms are increasingly being considered as accessible environments for conducting life-science research under spaceflight conditions. Biological investigations during space missions play an important role in improving our understanding of the physiological, cellular, and molecular responses elicited by spaceflight-related stressors, thereby contributing to the scientific knowledge required to support astronaut health and the development of future space exploration programs. As access to suborbital platforms expands, appropriate laboratory facilities are needed to collect, preserve, and process biological samples within the constraints imposed by flight operations. This note describes the planning, deployment, and operations of a temporary biomedical laboratory established at Spaceport America in support of the Virtute-1 mission, conducted during Virgin Galactic’s Galactic-01 research flight. The laboratory was designed to support biomedical activities involving both human participants and cellular payloads, including pre- and post-flight biological sample collection, cell-culture management, cold-chain preservation, and logistics associated with the transport of biological materials and scientific equipment. The laboratory was integrated within the flight environment of the Gateway to Space facility and required coordination of aerospace, biomedical, clinical, regulatory, and logistical stakeholders from public and private institutions. Particular attention was dedicated to biosafety procedures, infrastructure adaptation, equipment deployment, transportation planning, and mission-driven workflow integration. This paper describes how these activities were organized and implemented during a commercial suborbital mission. The experience gained during Virtute-1 provides practical considerations for the deployment of biomedical laboratories at commercial spaceports and for future life-science investigations using suborbital platforms.</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":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-026-10290-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132297","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
Ground-Based Air-Bearing Equivalent Verification for Active Vibration Isolation for Space Microgravity Utilization 空间微重力主动隔振地基空气轴承等效验证
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-30 DOI: 10.1007/s12217-026-10291-y
Tongzhe Zhang, Song Wang, Mengxi Yu, Wenbo Dong
{"title":"Ground-Based Air-Bearing Equivalent Verification for Active Vibration Isolation for Space Microgravity Utilization","authors":"Tongzhe Zhang,&nbsp;Song Wang,&nbsp;Mengxi Yu,&nbsp;Wenbo Dong","doi":"10.1007/s12217-026-10291-y","DOIUrl":"10.1007/s12217-026-10291-y","url":null,"abstract":"<div><p>Ground-based verification of space active vibration isolation systems faces fundamental challenges because traditional gravity compensation methods - such as quasi-zero stiffness mechanisms, suspension systems, and magnetic levitation - cannot simultaneously realize an ideal microgravity state across multiple degrees of freedom (DOFs) due to mechanical coupling. A horizontal air-bearing platform can provide near-frictionless motion in two horizontal translational DOFs and rotation about the vertical axis, thereby emulating three ground-accessible DOFs simultaneously. However, whether this environment provides an adequate equivalent for the translational vibration-isolation performance of a six-DOF space system, and whether sufficient long-term stability can be maintained, remain important questions. In this paper, we establish a six-DOF dynamic model of the air-bearing isolation system and derive the conditions under which three-DOF air-bearing tests can provide equivalent evaluation of the translational isolation performance of the full six-DOF system. We then design a verification environment comprising an air supply circuit, air-bearing structures, and a high-precision measurement and control system. Based on this platform, we conduct static control, wide-band excitation, and long-term stability tests on the active vibration isolation system, and evaluate the influence of the air-bearing environment on isolation performance. Both theoretical analysis and experimental results demonstrate that the air-bearing simulation method can effectively substitute for the space microgravity environment in verification, offering a viable technical pathway for performance testing of active vibration isolation systems.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133373","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
Physical Activity Countermeasures for Long-Duration Mars Missions: Transit, Surface Operations, and Return 长期火星任务的体力活动对策:过境、地面操作和返回
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-30 DOI: 10.1007/s12217-026-10293-w
Amirhossein AhmadiHekmatikar, Vladimir Pletser
{"title":"Physical Activity Countermeasures for Long-Duration Mars Missions: Transit, Surface Operations, and Return","authors":"Amirhossein AhmadiHekmatikar,&nbsp;Vladimir Pletser","doi":"10.1007/s12217-026-10293-w","DOIUrl":"10.1007/s12217-026-10293-w","url":null,"abstract":"<div><p>Long-duration human missions to mars will expose astronauts to approximately six to eight months of microgravity, prolonged confinement, communication delay, and limited medical support, all of which may compromise physiological capacity and mission readiness. Major challenges include skeletal muscle atrophy, bone mineral loss, cardiovascular deconditioning, fluid redistribution, metabolic disturbance, and reduced functional work capacity. Because these adaptations affect multiple systems simultaneously, exercise remains the primary operational countermeasure for preserving musculoskeletal, cardiovascular, and metabolic function. However, Current exercise protocols derived from ISS operations provide the main operational evidence base, but they may not be fully optimized for exploration-class missions. Based on this evidence, we propose a phase-specific physical activity framework for mars transit. This review synthesizes current evidence on the physiological consequences of prolonged microgravity and evaluates exercise as a multisystem countermeasure for mars transit. We propose a phase-specific physical activity framework that includes low-intensity daily movement for circulatory support, immune regulation, and behavioral stability; moderate-intensity aerobic exercise for cardiovascular maintenance; and high-intensity interval and resistance training for preserving muscle mass, strength, neuromuscular performance, and bone integrity. Practical considerations, including equipment limitations, adherence, injury risk, and the interaction between exercise and energy balance, are also discussed. Overall, the evidence supports a targeted and integrated exercise prescription model in which exercise is framed not as general fitness practice, but as a mission-critical strategy for preserving astronaut health, functional independence, and operational capability during deep-space exploration.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133388","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
A Quantitative Framework for Quality Assessment of Simulated Microgravity for Biological Systems: Biological Microgravity Evaluation Framework (BMEF) 生物系统模拟微重力质量评价的定量框架:生物微重力评价框架(BMEF)
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-30 DOI: 10.1007/s12217-026-10292-x
Parikshit Roychowdhury, Mirunalini Gobinath, Asanta Chandra, Galina Yu Vassilieva, Sohom Ghosh, Suvro Chatterjee, Phalke Pratik Kiran, Gowthamarajan Kuppusamy
{"title":"A Quantitative Framework for Quality Assessment of Simulated Microgravity for Biological Systems: Biological Microgravity Evaluation Framework (BMEF)","authors":"Parikshit Roychowdhury,&nbsp;Mirunalini Gobinath,&nbsp;Asanta Chandra,&nbsp;Galina Yu Vassilieva,&nbsp;Sohom Ghosh,&nbsp;Suvro Chatterjee,&nbsp;Phalke Pratik Kiran,&nbsp;Gowthamarajan Kuppusamy","doi":"10.1007/s12217-026-10292-x","DOIUrl":"10.1007/s12217-026-10292-x","url":null,"abstract":"<div><p>Currently, 2 dimensional and 3-dimensional clinostats (2D and 3D Clinostats), random positioning machines (RPMs) and other ground-based simulation techniques are very important tools for space biology research. However, their performance and validity are almost always assessed by observations or isolated parameters that often inadequately explain the mechanical microenvironment experienced by biological samples like cells and tissues. This leads to lack of uniformity and reproducibility specially in the case of biological experiments. The cells might act differently within same conditions of simulated microgravity in different experiments due to lack of a standardised quantitative framework to asses every aspect of simulated microgravity beyond vector averaging. In this study we compute Biological Microgravity Evaluation Framework (BMEF), which is a comprehensive computational step by step method to evaluate mechanical stability, directional isotropy, vector orientation coverage and biologically relevant exposure generated during a simulated microgravity study. In this current study we have used a 3D clinostat with partial RPM features, where the inner frame changed its orientation randomly within a 10 s timeframe. Acceleration data through a 3-axis accelerometer, at 24 min, 48 min, 96 min and 120 min was obtained and gravity vector dynamics were characterised. This quantitative framework combines available physical parameters, resultant mechanical loading, Directional Bias Vector (DBV), Orientation Coverage Index (OCI), and Orientation Uniformity Index (OUI) with novel biologically relevant parameters, Mechanical Quality Score (MQS), Effective Isotropic Exposure Time (EIET) to generate a Biological Microgravity Quality Index (BMQI). We observed that orientation of sampling became denser with duration of experiments and EIET increased proportionally with exposure duration while BMQI converged rapidly in the initial phase of the study then remained stable thereafter. This framework is intended to provide a quantitative descriptor of mechanical exposure conditions for future biological experiments.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-026-10292-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133372","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
Averaged Dynamics of Marangoni Convection in a Thin Liquid Film Under Vertical Vibrations 垂直振动下液体薄膜中马兰戈尼对流的平均动力学
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-30 DOI: 10.1007/s12217-026-10289-6
Ivan Volodin, Alexey Alabuzhev
{"title":"Averaged Dynamics of Marangoni Convection in a Thin Liquid Film Under Vertical Vibrations","authors":"Ivan Volodin,&nbsp;Alexey Alabuzhev","doi":"10.1007/s12217-026-10289-6","DOIUrl":"10.1007/s12217-026-10289-6","url":null,"abstract":"<div><p>Nonlinear regimes of thermocapillary convection in a thin liquid film with a free surface resting on a rigid substrate subjected to vertical vibrations and imposed vertical temperature gradient are investigated. From the standpoint of interfacial stability, the system is governed by several competing mechanisms, namely gravitational, capillary, and vibrational forces, together with thermocapillary effects. The linear stability analysis demonstrates that gravity and capillary forces exert a stabilizing influence, whereas thermocapillary mechanism destabilizes the system. Within the adopted long-wave approximation, the vibrational mechanism is also found to have a stabilizing effect. A weakly nonlinear analysis is performed to characterize the system behavior in the vicinity of the instability threshold. It is shown that weak external vibrations increase the instability threshold, while sufficiently strong vibrations reduce it. The full averaged nonlinear system of governing equations is solved numerically using the Radau IIA integration scheme. The results reveal a pronounced sensitivity of the system to the amplitude of the initial perturbations. Increasing the perturbation amplitude is shown to promote destabilization, whereas larger perturbation wavenumbers enhance the stability of the system. Stability map is constructed for different values of the imposed temperature gradient. In addition, stability maps are obtained for various gravitational conditions, including microgravity and zero-gravity environments. It is demonstrated that vibrational forcing can stabilize the system even in the absence of gravity. The results of the nonlinear analysis of the averaged governing equations are consistent with the predictions of the previously obtained linear stability analysis while providing additional insight into the system dynamics beyond the linear instability threshold.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133339","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 and Comparative Analysis of Onset of Nucleate Boiling Phenomena in a Narrow Rectangular Channel in Microgravity and Earth Gravity Environments 微重力和地球重力条件下窄矩形通道内核沸腾现象发生的研究与比较分析
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-24 DOI: 10.1007/s12217-026-10287-8
Fahim Foysal, Kai Luo, Jackson Brown, Walker Champion, Yan Tong, Chen Li
{"title":"Investigation and Comparative Analysis of Onset of Nucleate Boiling Phenomena in a Narrow Rectangular Channel in Microgravity and Earth Gravity Environments","authors":"Fahim Foysal,&nbsp;Kai Luo,&nbsp;Jackson Brown,&nbsp;Walker Champion,&nbsp;Yan Tong,&nbsp;Chen Li","doi":"10.1007/s12217-026-10287-8","DOIUrl":"10.1007/s12217-026-10287-8","url":null,"abstract":"<div><p>Understanding the onset of nucleate boiling (ONB) in different gravitational environments is crucial for industrial and space applications of flow boiling systems. This study presents a comparative analysis of ONB behavior in microgravity (µg) and Earth gravity (1g) environments to identify key differences. Boiling experiments were conducted using NASA’s experimental facility Flow Boiling and Condensation Experiment (FBCE) in microgravity aboard the International Space Station (ISS), and under Earth gravity conditions on a brassboard facility at NASA Glenn Research Center. Experiments were performed in a narrow rectangular channel using n-perfluorohexane (nPFH) as the working fluid, with inlet subcooling ranging from 6 to 24 °C and mass fluxes between 200 and 3000 kg/m<sup>2</sup>s under single-side heating. Wall temperatures were measured using embedded thermocouples, and flow visualization was obtained using a high-speed camera. Analysis of transient wall temperature profiles revealed distinct ONB behaviors in µg and 1g. In µg, multiple ONB-like events characterized by wall temperature drops occurred, whereas ONB was observed only once in 1g. Bubble nucleation at ONB was distributed along the entire channel length in µg but was confined to the downstream region in 1g. The ONB temperature drop profile was flatter in microgravity, indicating more spatially distributed nucleation compared to the localized behavior in 1g. Additionally, the transient behavior of bulk fluid temperature, inlet and outlet pressure, and mass flux during ONB was analyzed. Finally, two non-dimensional correlations were developed to predict ONB heat flux and superheat for µg and 1g conditions within the investigated operating ranges, showing reasonable agreement with experimental data.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035047","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
The LIFT Module: A Modular Fixation Platform for Biological Research on Sounding Rockets LIFT模块:探空火箭生物研究的模块化固定平台
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-23 DOI: 10.1007/s12217-026-10288-7
Ilse Marie Holbeck, Maximilian Sturm, Sebastian Feles, Sarah Schunk, Christian Liemersdorf, Jens Hauslage
{"title":"The LIFT Module: A Modular Fixation Platform for Biological Research on Sounding Rockets","authors":"Ilse Marie Holbeck,&nbsp;Maximilian Sturm,&nbsp;Sebastian Feles,&nbsp;Sarah Schunk,&nbsp;Christian Liemersdorf,&nbsp;Jens Hauslage","doi":"10.1007/s12217-026-10288-7","DOIUrl":"10.1007/s12217-026-10288-7","url":null,"abstract":"<div><p>Biological experiments under altered gravity conditions as encountered on sounding rockets often require automated in-flight chemical fixation under the challenging environmental and operational constraints, as accompanying any spaceflight mission. Enabling in-flight fixation while maintaining laboratory-equivalent cultivation conditions from ground handling to recovery poses significant challenges for reliability and reproducibility of experiment scenarios. A common flight-qualified architecture can address these constraints by enforcing controlled environmental and operational execution while decoupling sample-dependent fixation configurations through modular payload integration. This work describes a reusable, automated and standardized fixation payload platform designed to host interchangeable, pre-qualified chemical fixation payloads for biological experiments on a variety of platforms to achieve altered gravity. The module provides a standardized mechanical, thermal and electrical architecture for the integration and operation of experiments employing either adherent or suspension-based cells within a single flight-qualified unit, independent of the specific fixation configuration required. Hardware and operational performance were qualified within the German Aerospace Center’s (DLR) Materialphysikalische Experimente unter Schwerelosigkeit (MAPHEUS®) sounding rocket program. Laminar In-flight Fixation Technology (LIFT) was successfully flown across several missions and payload configurations, in-flight data demonstrate reliable execution of fixation procedures, stable thermal regulation, a pressure-stabilized internal environment and automated housekeeping data acquisition. The presented work establishes LIFT as a versatile, spaceflight-proven module to carry out a wide variety of cell culture experiments, allowing customizable in-flight fixation of samples as well as their monitoring within a common architecture.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-026-10288-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149034818","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
Experimental Investigation of Plug Flow Hydrodynamics in a T-Junction Rectangular Microchannel t型结矩形微通道塞流流体力学实验研究
IF 1.5 4区 工程技术
Microgravity Science and Technology Pub Date : 2026-09-19 DOI: 10.1007/s12217-026-10283-y
Mohammed Said, Souad Harmand, Nora Nait Bouda
{"title":"Experimental Investigation of Plug Flow Hydrodynamics in a T-Junction Rectangular Microchannel","authors":"Mohammed Said,&nbsp;Souad Harmand,&nbsp;Nora Nait Bouda","doi":"10.1007/s12217-026-10283-y","DOIUrl":"10.1007/s12217-026-10283-y","url":null,"abstract":"<div><p>This study experimentally investigates the hydrodynamics of plug flow in a rectangular T-junction microchannel using various fluid systems with different viscosity ratios. Three key parameters, plug length, plug velocity, and plug shape, were systematically analysed as functions of the flow rate ratio, capillary number, and viscosity ratio. The results show that the interplay between viscous forces, inertial forces, and interfacial tension at the junction strongly governs droplet/plug formation and length. Comparisons with existing correlations in the literature show excellent agreement with the experimental data. A power-law model was found to be a better predictor of plug velocity than a linear model. The viscosity ratio was found to affect plug velocity significantly. Furthermore, the study shows that the final plug shape is determined by both system design and fluid properties. Channel geometry, and junction configuration were found to influence plug morphology, particularly curvature radii of the front and rear. These findings provide valuable insights for optimising the design and performance of microchannel-based heat sink systems.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":"38 5","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986763","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
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