{"title":"Auditory Go/NoGo Task in the Dry Immersion Model of Microgravity","authors":"Ivan E. Lazarev","doi":"10.1007/s12217-024-10118-8","DOIUrl":"10.1007/s12217-024-10118-8","url":null,"abstract":"<div><p>The effects of a ground-based model of microgravity on executive functions (namely, inhibition) were investigated in this study. Volunteers participated in so-called dry immersion (DI), during which they spent 21 days in a water-filled tub in the supine position. During this period, they performed an auditory Go/NoGo task while multichannel EEG activity was recorded. The Go/NoGo task was performed one time outside of the DI and two times during the stay in the DI. ERPs were computed on correct NoGo and Go trials. While no behavioral deterioration of the Go/NoGo task was found during their stay in the DI, a significant difference was found in amplitudes between NoGo N2 ERP peaks before DI and during DI. The N2 peak was smaller on the 17th day of DI, indicating a potentially lower level of inhibitory control during simulated microgravity conditions. The amplitudes of the N1 and P3 peaks did not change significantly. The dry immersion procedure reproduces some of the important physiological factors of real space flights (support withdrawal, bodily liquid redistribution), thus our results hint at possible brain and behavioral alterations in real space flight that have so far been unnoticed.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141061367","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}
Daniel Dietrich, Timmothy Krause, Vedha Nayagam, Tanvir Farouk, Frederick Dryer, Forman Williams
{"title":"Low Temperature n-Dodecane Droplet Combustion Experiments Aboard the International Space Station","authors":"Daniel Dietrich, Timmothy Krause, Vedha Nayagam, Tanvir Farouk, Frederick Dryer, Forman Williams","doi":"10.1007/s12217-024-10115-x","DOIUrl":"10.1007/s12217-024-10115-x","url":null,"abstract":"<div><p>This paper presents data from large, isolated n-dodecane droplets burning in microgravity on the International Space Station, along with preliminary comparisons with numerical and analytic predictions indicating general agreement in trends. The tests involved were primarily in air (a few in reduced oxygen) at ambient pressures ranging from 0.50 to 5.0 atm. After ignition, the droplets burn with a hot flame that extinguishes when the radiant energy loss causes the flame temperature to drop below the hot-flame-required value. The total flame radiative loss at extinction is nearly independent of pressure, while the peak flame diameter prior to hot-flame extinction decreases with increasing pressure. The maximum hot-flame temperature, inferred from fiber-support radiative emisssions, decreases with increasing pressure, and the hot flames become dimmer with increasing pressure. At 1.0 atm and below there is a prolonged period of coolflame burning that ends with cool-flame extinction at a finite droplet size; the cool-flame-extinction droplet diameter increases and the cool-flame burning rate decreases with decreasing ambient pressure. Above 1.25 atm warm-flame burning and hot-flame re-ignitions become prevalent. At 5.0 atm, there is no abrupt hot-flame extinction with transition to a cool flame; the flame gradually gets dimmer, and the flame temperature decreases over a much longer time, the transition between hot-flame and warm-flame burning becoming almost undiscernible.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140926910","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}
Hongqiang Chen, Wanbo Liu, Yonghai Zhang, Jinjia Wei, Wangfang Du, Zhiqiang Zhu, Bin Li, Shuai Wang
{"title":"Hybrid Surfaces with Capillary Wick and Minichannels for Enhancement of Phase-Change Immersion Cooling of Power Electronics","authors":"Hongqiang Chen, Wanbo Liu, Yonghai Zhang, Jinjia Wei, Wangfang Du, Zhiqiang Zhu, Bin Li, Shuai Wang","doi":"10.1007/s12217-024-10117-9","DOIUrl":"10.1007/s12217-024-10117-9","url":null,"abstract":"<div><p>The pool boiling heat transfer (phase-change immersion cooling) phenomenon holds significant importance in the energy consumption management of large-power electronics. However, the optimization of surface structure for achieving stable and efficient heat transfer during boiling process remains a significant challenge. Herein, we propose a simplified and direct hybrid surface strategy that combines crossed mini channels and a capillary wick to address the cooling issues faced by high-performance power devices. The copper capillary wick is combined with the crossed mini channel to form a hybrid surface by a simple integrated sintering method. This study investigates the combined effects of different parameters of the capillary wick (average diameter size and powder addition) and minichannels (depth and width) on enhancing the nucleate boiling performance on these hybrid surfaces. The working fluid used in this investigation is HFE-7100. At <i>ΔT</i><sub>sub</sub> = 30 K, the CHF achieved by the hybrid surfaces combining capillary wicks and minichannels can reach 131 W/cm<sup>2</sup>, while the highest HTC is measured at 2.32 W/(cm<sup>2</sup>·K), both CHF and HTC achieve multiplicative enhancement compared to smooth surfaces. Furthermore, we have developed a CHF prediction model for the hybrid surfaces, which exhibits a prediction error of less than 15%.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140926911","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}
{"title":"Containerless Solidification of a Hollow Droplet with Forced Convection","authors":"Nang X. Ho, Binh D. Pham, Truong V. Vu","doi":"10.1007/s12217-024-10112-0","DOIUrl":"10.1007/s12217-024-10112-0","url":null,"abstract":"<div><p>The phenomenon of solidified suspended hollow droplets is often run into industry and nature. In this study, we focus on the containerless solidification process of a hollow droplet undergoing a forcing flow. We found that when the radius ratio (<i>R</i><sub><i>io</i></sub>) varied with different growth angles, it changes the trend of the solidification rate of the solidifying front over time. Specifically, with the growth angle of 5° (i.e., <i>Φ</i><sub><i>gr</i></sub> = 5°), the suspended hollow droplets finished solidification in almost the same time for <i>R</i><sub><i>io</i></sub> in the range of 0.2–0.7. When we increase the growth angle by 5°, i.e., <i>Φ</i><sub><i>gr</i></sub> = 10°, the solidification time increases with the increase of <i>R</i><sub><i>io</i></sub>. Also following the increase of <i>R</i><sub><i>io</i></sub>, this increase in the solidification time is even higher for the growth angle <i>Φ</i><sub><i>gr</i></sub> = 15°. The inlet temperature is also considered. Obviously, increasing the inlet temperature increases the solidification time of the hollow droplets. In addition, when the Reynolds number increases, the solidification time of the droplets also tends to increase. However, the increment of this trend is different under different temperatures of the forcing flow.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140926850","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}
{"title":"Exploring the Impact of Simulated Microgravity on Cellular DNA: A Comparative Analysis of Cancer and Normal Cell Lines","authors":"Saifaldeen Altaie, Amera Alrawi, Xuexin Duan, Qater Alnada","doi":"10.1007/s12217-024-10116-w","DOIUrl":"10.1007/s12217-024-10116-w","url":null,"abstract":"<div><p>The examination of the impact of microgravity on biological systems has gained considerable attention owing to its potential implications for health and disease. Simulated microgravity serves as a valuable methodology for elucidating the intricate cellular responses to altered gravitational conditions. This study investigates the effects of simulated microgravity on cellular DNA, employing four distinct cell lines—breast, brain, and esophageal cancer cells, in conjunction with normal cells for comparative analysis. The experiment utilized the comet assay test to quantitatively assess DNA damage. The results revealed a discernible disparity in the response to simulated microgravity, notably with cancer cells exhibiting a significant increase in DNA damage compared to the relatively minimal effects observed in both control and normal cells. Furthermore, within the cancer cell lines, significant variations in the extent of DNA damage were evident, implying a cell type-dependent response to simulated microgravity. These findings illuminate the potential differential susceptibility of cancerous and normal cells to microgravity-induced DNA damage. Consequently, this research substantially contributes to our comprehension of microgravity-induced cellular responses and unveils promising avenues for targeted interventions in cancer therapy.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140835317","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}
{"title":"Study on Surface Active Bubble Dynamics Properties under Strong Low-Frequency Sound Waves","authors":"Yun Zhao, Ruiqi Huang, Yong Chen, Qi Feng","doi":"10.1007/s12217-024-10101-3","DOIUrl":"10.1007/s12217-024-10101-3","url":null,"abstract":"<div><p>This paper delves into the dynamics of surface-active bubbles under low-frequency acoustic waves, with a focus on the stability effect and basic principle of rupture. The Rayleigh-Plesset equation is extended and modified based on real biological data, resulting in a model of surface-active bubbles with nonlinear surface tension. Using the Runge-Kutta method for numerical calculations, it is observed that larger acoustic wave amplitudes lead to larger bubble amplitudes. The acoustic wave frequency only affects the bubble vibration frequency in the low-frequency range, but at the resonance frequency, the bubble oscillations are violent. To further explain bubble rupture, the stress-strain relationship of the surface active layer of the bubble is studied, with the stress on the wall increasing sharply with the bubble radius. The stability of the non-spherical interface of the surface-active bubbles reveals a critical radius value, with bubbles in a stable state when the radius is smaller than this value. Through simulation, it is observed that bubbles vibrate in a steady state under stable conditions, but when the radius exceeds the critical value, a non-spherical interface appears ultimately resulting in inward depression and rupture.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140812014","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}
Phil DB Price, John E Kennett, Jonathan PR Scott, David A Green, Daniel J Cleather
{"title":"Landing Style Influences Peak ‘Ground’ Reaction Forces during Repeated Jumping Using a Supine Jump Sled in Microgravity","authors":"Phil DB Price, John E Kennett, Jonathan PR Scott, David A Green, Daniel J Cleather","doi":"10.1007/s12217-024-10114-y","DOIUrl":"10.1007/s12217-024-10114-y","url":null,"abstract":"<div><p>Repeated jumping has been demonstrated as a feasible exercise countermeasure in microgravity and has been shown to reduce deconditioning in head down bed rest studies. However, varying landing stiffness may provide greater contribution of both axial and medio-lateral bone strain and muscle loading at greater muscle lengths, which may help minimize bone and muscle deconditioning. Therefore, this study investigated the effect of different landing styles on the force profile and ground contact time during repeated jumping using HIFIm in microgravity. Two participants performed repeated jumping on the HIFIm jump sled in microgravity during a parabolic flight campaign. ‘Ground’ forces and ground contact time were compared between landing styles where increased landing stiffness was instructed to the jumper, and increased spring resistance. The results show that the forces experienced when performing repeated jumps in microgravity are sensitive to the landing style employed. As greater stiffness was instructed, peak forces increased, and ground contact time decreased significantly. Peak forces and ground contact time also significantly increased when spring resistance increased. These results highlight that landing instructions and spring configurations could be used as training variables when developing an astronaut training program, which can use different jump styles to minimize bone and muscle deconditioning. Further research using bed rest analogs and repeated jumping using HIFIm is needed to demonstrate varied repeated jumping interventions as an effective exercise method for minimizing deconditioning in astronauts.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140804568","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}
{"title":"Hypergravity Impact on Fertility of Apis mellifera carnica Queens – Case Study","authors":"Dagmara Stasiowska, Michał Kolasa","doi":"10.1007/s12217-024-10111-1","DOIUrl":"10.1007/s12217-024-10111-1","url":null,"abstract":"<div><p>The launch is considered the most stressful rocket flight stage due to the hypergravity occurrences. The possibility of using honey bees (<i>Apis mellifera</i>) as the extraterrestrial pollinator depends on their ability to reproduce correctly after experiencing hypergravity. The described study aims to verify the impact of a launching rocket’s acceleration on honey bee queen’s egg-laying behavior. Four artificially inseminated <i>A. mellifera carnica</i> queens were placed in the Human Training Centrifuge and given to the acceleration pattern of the launching <i>Soyuz</i> rocket. Next, the data on the number of food stores, eggs, larvae, and worker and drone pupae were collected from the test and control hives using the modified <i>Liebefeld</i> method. The pilot study results imply that accelerated queen’s egg-laying behavior may change twofold: limiting or maximizing the number of laid eggs, with the control queen egg-laying rate remaining stable for all samples. The number of drone pupae is greater for the test sample colonies, with its earlier appearance in the hive. No impact on overwintering success was observed. Authors indicate limitations of the results and a need to continue the study to verify the occurrence of anomalies potentially related to the examined factor.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-024-10111-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140663190","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}
Luciana Pereira Simões, Carlos Renato dos Santos, Alison Moraes
{"title":"A Proposed Methodology for Assessment of Li-ion Cell Suitability and Safety for Suborbital Vehicle Applications","authors":"Luciana Pereira Simões, Carlos Renato dos Santos, Alison Moraes","doi":"10.1007/s12217-024-10110-2","DOIUrl":"10.1007/s12217-024-10110-2","url":null,"abstract":"<div><p>Lithium-ion batteries are a feasible solution to store energy efficiently. However, in safety-critical environments such as the suborbital rockets, the introduced technologies do not may compromise safety. This research explores the possibility of replacing Ni-MH batteries with Li-ion batteries. However, before replacing technologies, the reliability of Li-ion cells needs to be evaluated, and the potential benefits must be considered against the risks to ensure the mission’s success. The main objective is to ensure the safety and integrity of suborbital missions during the technology transition. To assess the technology exchange, a method where the battery cell experiences a sequence of tests that cover aspects of safety encountered during the vehicle missions, such as vacuum, capacity, short circuit behavior, over-current discharge, behavior at higher environment temperature, and pulsed discharge behavior. To experience the proposed method, two Li-ion cells commercial off-the-shelf (COTS) from different manufacturers are evaluated. The results indicated that only one of the two cell models evaluated can substitute the Ni-MH. This research concludes that replacing Ni-MH cells with Li-ion cells is feasible, for such an application. The proposed acceptance flow design based on the test collectively validates the replacement, showing that the Li-ion cells can offer reliability, safety, and efficiency to suborbital vehicles to fulfill this mission profile.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140616832","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}
Jessica J. Frick, Rachel Ormsby, Zhou Li, Yaprak Ozbakir, Chen Liu, Jasmine M. Cox, Carlo Carraro, Roya Maboudian, Debbie G. Senesky
{"title":"Autoclave Design for Microgravity Hydrothermal Synthesis","authors":"Jessica J. Frick, Rachel Ormsby, Zhou Li, Yaprak Ozbakir, Chen Liu, Jasmine M. Cox, Carlo Carraro, Roya Maboudian, Debbie G. Senesky","doi":"10.1007/s12217-024-10109-9","DOIUrl":"10.1007/s12217-024-10109-9","url":null,"abstract":"<div><p>Microgravity offers an enticing synthetic knob for materials scientists to explore—however, this environment creates major challenges in hardware development that can turn a simple 3-day experiment into a 3-year long nightmare. This paper provides an overview of engineering an autoclave, compatible with NASA’s Solidification Using a Baffle in Sealed Ampoules (SUBSA) furnace, to enable microgravity hydrothermal synthesis—an acceleration-sensitive technique that processes aqueous samples above the boiling point of water. Hydrothermal synthesis is a universal chemical transformation technique that is used to produce a range of advanced materials with applications in alternative energy, healthcare, and the food industry. In this work, we use the synthesis of graphene hydrogel as a case study to verify our hardware design on Earth before launching to the International Space Station for microgravity testing. The design addresses pertinent challenges which include enabling thermal expansion while preventing air bubble formation in solution and implementing a pressure fail-safe above the maximum operating temperature. Our goal in presenting this autoclave design is to provide a step forward towards commercial-of-the-shelf microgravity hardware.</p></div>","PeriodicalId":707,"journal":{"name":"Microgravity Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12217-024-10109-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140601542","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}