Short-term Space Research Articles

The galactic cosmic ray intensity fluctuations during perturbations of the solar wind in early November 2021

In order to develop methods for predicting negative manifestations of space weather, the dynamics of fluctuations in the intensity of galactic cosmic rays during geophysical disturbances in early November 2021 is studied. The obtained results point to the possibility of real-time short-term space weather forecasting based on the measurement data of the Russian national ground-based network of cosmic ray stations.

문화예술을 매개로 한 도시재생에 미치는 영향요인

The city of Seoul established a creative space and provided artists with space for their studios in an attempt to contribute to the promotion of culture and arts by promoting the creative activities of artists. It also sought to achieve the goal of regenerating a decaying city through the collective creative activities of artists. In this study, we empirically analyzed the impact of the government's space support for creative activities, fairness of art support, and artists' knowledge and information sharing on urban regeneration through culture and arts targeting artists in creative spaces in Seoul. As a research method, a survey was conducted targeting artists, and causal analysis was conducted through structural equation analysis. As a result of the analysis, it was found that the government's spatial support and fairness in art support indirectly affected urban regeneration through creative spaces, and that artists' knowledge and information sharing most strongly and directly had a positive effect on urban regeneration. In this way, the result of support for creative space was contrary to prediction, as it was revealed that the government's short-term space support for artists did not have an effect on spontaneity, which is an important factor in urban regeneration through culture and arts. As a result, it was revealed that efforts should be made to promote knowledge and information sharing among artists for the creative activities of artists selected for the creative space.

ИНДИВИДУАЛЬНЫЕ ОСОБЕННОСТИ И ФАКТОРЫ УСПЕШНОСТИ АДАПТАЦИИ К УСЛОВИЯМ ДВУХНЕДЕЛЬНОЙ ИЗОЛЯЦИИ, МОДЕЛИРУЮЩЕЙ ПОЛЕТ НА ЛУНУ

The investigation is analysis of psychological adaptation to an experimental isolation modeling a short-term space exploration mission. Project Eskiz (Sketch) was designed as a 14-d isolation of 4 male and 2 female subjects in a small chamber including exits on a Lunar surface on days 8 and 9. Dynamics of adaptation to the psychological stress in isolation was analyzed by 4 subsyndromes. For all crewmembers particularly stressful were the first 4 days of isolation, and EVA days. Three coping strategies were stable (reliable), situational (unstable) and asthenic (unbalanced). The favorable factors included previous experience, high motivation, goal-based cohesion of the crew and cultural commonality. Results of the investigation can be of practical implication in optimization of the methods of selection, preparation and consulting spacecrew members in future missions.

SimplETAS: A Benchmark Earthquake Forecasting Model Suitable for Operational Purposes and Seismic Hazard Analysis

Abstract The epidemic-type aftershock sequence (ETAS) model is the most effective mathematical description of the short-term space–time earthquake clustering. However, the use of such a model is sometimes hampered by the difficulty in estimating the high number of its unknown correlated parameters. Moreover, the most recent ETAS formulations introduce the space–time variability of some parameters that makes their estimation even more arduous. Here, we investigate the model in an opposite perspective, looking for the simplest ETAS parameterization that can satisfactorily describes the earthquake clustering in crustal tectonic regions; we named this model simplETAS. We show that simplETAS calibrated with the Italian seismicity of the last decades adequately describes the space–time occurrence of the out-of-sample largest earthquakes in the instrumental and historical catalog, confirming the validity of the assumptions made to build the model. Owing to its simplicity, simplETAS is easily applicable in most regions, and it has some important properties that are worth being remarked. First, simplETAS can be used as a benchmark model to assess the relative predictive skill of more complex earthquake forecasts. Second, it may be used for operational earthquake forecasting purposes in regions with limited earthquake catalogs. Third, it provides a straightforward, flexible, and effective approach to generate synthetic earthquake catalogs of variable length to be implemented in seismic hazard and risk analysis, overcoming all the declustering-related problems and the controversial Poisson assumption.

The potential of catalysis for closing the loop in human space exploration

This mini-review provides a perspective on how catalysis can contribute to the challenge of human space exploration, i.e. to the establishment of a space habitat on the Moon in the near future and the realization of a journey to Mars in the far future. The role of catalysis for space exploration is reviewed along elemental resource provisions for human life that are based on catalytic chemical processes. As a secondary effect, learning about catalysis under the high constraints of the sustainability requirements inherent to long-term space missions can be beneficial for the advancement of currently developed catalytic processes for a green, circular economy on Earth. In-depth research into catalysis for space applications could therefore also provide answers to urgent industrial, environmental and social sustainability challenges on our planet e.g., as expressed by the United Nations Sustainability Development Goals. Even for today’s short-term space missions, catalysis already plays a key role in the Environmental Control and Life Support System (ECLSS) on the International Space Station (ISS) and moreover, in fuel and propellant synthesis as well as the recycling of combustion products such as CO2.

Learning signatures of decision making from many individuals playing the same game.

Human behavior is incredibly complex and the factors that drive decision making-from instinct, to strategy, to biases between individuals-often vary over multiple timescales. In this paper, we design a predictive framework that learns representations to encode an individual's 'behavioral style', i.e. long-term behavioral trends, while simultaneously predicting future actions and choices. The model explicitly separates representations into three latent spaces: the recent past space, the short-term space, and the long-term space where we hope to capture individual differences. To simultaneously extract both global and local variables from complex human behavior, our method combines a multi-scale temporal convolutional network with latent prediction tasks, where we encourage embeddings across the entire sequence, as well as subsets of the sequence, to be mapped to similar points in the latent space. We develop and apply our method to a large-scale behavioral dataset from 1,000 humans playing a 3-armed bandit task, and analyze what our model's resulting embeddings reveal about the human decision making process. In addition to predicting future choices, we show that our model can learn rich representations of human behavior over multiple timescales and provide signatures of differences in individuals.

Short-term space use of small-bodied fish in coastal flats ecosystems in The Bahamas: an acoustic telemetry study using the smallest commercially available transmitters

Short-term space use of small-bodied fish in coastal flats ecosystems in The Bahamas: an acoustic telemetry study using the smallest commercially available transmitters

Effects of short-term space conditions on cellulose degradation ability and biodiversity of microorganisms

Effects of short-term space conditions on cellulose degradation ability and biodiversity of microorganisms

Long distance homing in the cane toad (Rhinella marina) in its native range.

ABSTRACTMany animals exhibit complex navigation over different scales and environments. Navigation studies in amphibians have largely focused on species with life histories that require accurate spatial movements, such as territorial poison frogs and migratory pond-breeding amphibians that show fidelity to mating sites. However, other amphibian species have remained relatively understudied, leaving open the possibility that well-developed navigational abilities are widespread. Here, we measured short-term space use in non-territorial, non-migratory cane toads (Rhinella marina) in their native range in French Guiana. After establishing site fidelity, we tested their ability to return home following translocations of 500 and 1000 m. Toads were able to travel in straight trajectories back to home areas, suggesting navigational abilities similar to those observed in amphibians with more complex spatial behavior. These observations break with the current paradigm of amphibian navigation and suggest that navigational abilities may be widely shared among amphibians.

Short- and long-term dental arch spatial changes following premature loss of primary molars: A systematic review.

The aim of this study was to evaluate the dental arch spatial changes in maxillary and mandibular arches after premature loss of primary molars. Primary teeth must be maintained during the change from primary to mixed and then permanent dentition, to preserve and maintain the dental arch. When this normal process is disturbed, usually due to severe decay requiring extraction before normal exfoliation, it can result in migration of adjacent teeth toward the missing space resulting in decreased arch length and malocclusion in the permanent dentition. A comprehensive search was conducted using electronic databases such as PubMed Central, Cochrane Database of Systematic Reviews, Google Scholar, LILACS, and ScienceDirect. The title and abstract were screened to find relevant articles, which were then reviewed in full to see if they were worthy of inclusion. All longitudinal and observational studies that looked at space changes after the loss of primary first or second molars were included. Quality assessment of the studies was done based on the Newcastle-Ottawa scale as all the included studies were non-randomized studies. Four thousand five hundred and seventy-eight articles were identified by screening electronic database and assessed for eligibility, 12 full-text articles were assessed, and 4 full-text articles were excluded as they did not match the inclusion criteria. Thus, eight articles were included in this systematic review. Short term and long term space changes and loss of maxillary and mandibular molars were studied individually. In the short term changes, the distal migration of the primary cuspid towards the missing space within 1 month was attributable to early space changes after premature loss of the mandibular first molar, and the greatest space loss was recorded in the first 3 months after premature loss. After the premature loss of the maxillary first molar, immediate space loss of 1mm was documented due to distal migration of the primary canine. Studies found that space loss was caused by the distal migration of primary canines in the case of mandibular primary first molar loss, and that space loss was larger in the mandibular arch after premature loss of second primary molars. The greatest repercussions occurred during the first 3 months after the deciduous molars were extracted, and a space maintainer was recommended in the majority of cases, mainly when there is premature loss of mandibular second primary molar as it leads to mesial displacement of the first permanent molar.

Clinical Effectiveness of Fiber-reinforced Composite Space Maintainer and Band and Loop Space Maintainer in a Pediatric Patient: A Systematic Review and Meta-analysis.

BackgroundObjectives: This systematic review aimed to evaluate the clinical effectiveness of fiber-reinforced composite space maintainer (FRCSM) and band and loop space maintainer (BLSM) in a pediatric patient.Materials and methodsEligibility criteria: Randomized controlled trials (RCTs) were conducted on 3–12-year-old children who received FRCSM and BLSM. Information sources: Literature search of electronic databases such as PubMed, Cochrane, and Google Scholar for the time period of 2000 to October 2020. Risk of bias: Cochrane collaboration's risk of bias tool was used to assess the risk of bias.ResultsIncluded studies: The search resulted in 147 published studies. After the removal of duplicate studies and full-text analysis, eight studies were selected. Synthesis of results: Fiber-reinforced composite restoration (FRCSM) was judged to be good for short-term space maintenance with good esthetics, less time-consuming, and good patient and parental acceptance. Meta-analysis was done for failure rate at 6 months and 12 months. After 6 months, the FRCSM group showed less failure, with a risk ratio of 0.83 (95% CI = 0.47–1.49; Z value = 0.61). However, after 12 months, the FRCSM group showed more failure, with a risk ratio of 1.30 (95% CI = 0.04–4.23; Z value = 0.44). Description of the effect: FRCSM performed better than BLSM for a short-term, i.e., around 6 months but after 12 months of space maintainer placement BLSM performed better than the FRCSM.DiscussionStrengths and limitations of evidence: The strength of this systematic review is its complete adherence to the PRISMA statement 2009. This review attempted to evaluate the effectiveness of FRCSM when compared with BLSM which has not been evaluated before. Additionally, only RCTs were included in this review adding to its validity. This review also included a meta-analysis that compared the failure rate at the 6th and 12th month. The main shortcoming of this systematic review is the limited number of databases searched and the limited number of existing studies. Interpretation: Within the limitations of this review, it can be stated that the FRCSM is an effective space maintainer for short-term space maintenance. However, it is necessary to conduct more RCTs with larger sample size, preferably using a split-mouth design to improve the longevity of FRCSM. Additionally, it is also necessary to standardize the technique of fabrication of FRCSM since an existing study showed high heterogeneity in the technique of fabrication.OtherFunding: None. Registration: The protocol of this systematic review was registered on PROSPERO (ID-CRD42020165831).How to cite this articleKamki H, Kalaskar R, Balasubramanian S, et al. Clinical Effectiveness of fiber-reinforced Composite Space Maintainer and Band and Loop Space Maintainer in a Pediatric Patient: A Systematic Review and Meta-analysis. Int J Clin Pediatr Dent 2021;14(S-1):S82–S93.

How flexible are habitat specialists? Short-term space use in obligate coral-dwelling damselfishes

As habitats change, highly specialised species may die or be forced to relocate. However, some obligate coral-dwelling damselfishes appear to survive the localized extinction of their primary habitat, branching coral, caused by coral bleaching. To address this apparent paradox, we documented the spatial behaviour of obligate coral-dwellers in relation to habitat quality. Focussing on two obligate coral-dwelling damselfishes (Pomacentrus moluccensis and Chromis viridis), we used KUDs (Kernel Utilisation Distributions) to quantify fishes’ short-term space use (daily 5 min observations across 6 days) and related it to live coral cover and structural complexity derived from 3D photogrammetry. Specifically, we calculated movement extent (95% KUD), core areas (50% KUD) and the temporal consistency of occupied areas across consecutive days. Structural complexity had no effect on space use. The effect of live coral cover was significant but weak and dependent on fish body-size: core areas increased with decreasing live coral cover for large fishes; smaller fishes showed little response. In contrast to weak habitat effects, there were strong differences across sites. At one site, average core areas increased three-fold to 1.1 m2 for P. moluccensis and over 60-fold for C. viridis, from 1.14 m2 to an average core area of 92.34 m2 and a maximum recorded extent of 1471.4 m2. These findings may help explain these fishes’ apparent, unexpected resilience to habitat loss. Obligate coral-dwelling fishes may prefer branching live coral, but their ‘obligate’ dependence may be more flexible and context dependent. As ecosystems reconfigure, plasticity in fine-scale spatial behaviour may be critical for the persistence of fish populations.

Inferring depth-dependent plasma motions from surface observations using the DeepVel neural network

Coverage of plasma motions is limited to the line-of-sight component at the Sun’s surface. Multiple tracking and inversion methods were developed to infer the transverse motions from observational data. Recently, the DeepVel neural network was trained with computations performed by numerical simulations of the solar photosphere to recover the missing transverse component at the surface and at two additional optical depths simultaneously from the surface white light intensity in the Quiet Sun. We argue that deep learning could provide additional spatial coverage to existing observations in the form of depth-dependent synthetic observations, i.e. estimates generated through the emulation of numerical simulations. We trained different versions of DeepVel using slices from numerical simulations of both the Quiet Sun and Active Region at various optical and geometrical depths in the solar atmosphere, photosphere and upper convection zone to establish the upper and lower limits at which the neural network can generate reliable synthetic observations of plasma motions from surface intensitygrams. Flow fields inferred in the photosphere and low chromosphere τ ∈ [0.1, 1) are comparable to inversions performed at the surface (τ ≈ 1) and are deemed to be suitable for use as synthetic estimates in data assimilation processes and data-driven simulations. This upper limit extends closer to the transition region (τ ≈ 0.01) in the Quiet Sun, but not for Active Regions. Subsurface flows inferred from surface intensitygrams fail to capture the small-scale features of turbulent convective motions as depth crosses a few hundred kilometers. We suggest that these reconstructions could be used as first estimates of a model’s velocity vector in data assimilation processes to nowcast and forecast short term solar activity and space weather.

КРАТКОСРОЧНОЕ ПРОГНОЗИРОВАНИЕ КОСМИЧЕСКОЙ ПОГОДЫ НА ОСНОВЕ МЕТОДА ЭКСПОНЕНЦИАЛЬНОГО СГЛАЖИВАНИЯ

The paper presents information on the results of short-term space weather forecasting for the Vostochny cosmodrome based on data on the electron flux density with energies above 2 MeV received from satellites from the operator's site of the Space Weather Forecast Center of the Moscow State University Institute of Nuclear Physics. The analysis of the calculated data on the level of near-Earth radiation, as a result of the use of various extrapolation methods, showed that the method of exponential smoothing is most effective for short-term space weather forecasting. Such forecasts can be used when planning launches of launch vehicles from spaceports.

Short-term space safety analysis of LEO constellations and clusters

The large satellite constellations currently planned and deployed in Low Earth Orbit (LEO) bear some similarities with the clusters of derelict objects abandoned in different altitude bands in LEO. Given these similarities, an analysis of the collision risk associated with these orbital systems is performed with different analytical and numerical techniques.Different tools developed at IFAC-CNR for short to long-term constellation impact analysis are applied to ascertain the immediate (i.e., 1–20 years) effects related to the constellation deployment and execution and to evaluate the risk associated to the accumulation of massive derelict objects in a restricted region of space (i.e., clusters). The intra-group collision probability caused by the repeated orbital crossing between the members of two selected constellations and of some of the clusters of objects in LEO are computed, cumulated over the time span of the analysis (20 years) and compared. While the collision probability obtained in the case of the constellation could be efficiently mitigated by proper management and operations (i.e., debris mitigation practices and collision avoidance), the high level of risk associated with the clusters of derelict uncontrolled objects cannot be avoided, unless pro-active actions are undertaken to remove the large targets from the space. From all the analysis performed, the cluster located around 975 km of altitude stands up as particularly dangerous population in the already critical LEO region.

Mesoscale movement and recursion behaviors of Namibian black rhinos

BackgroundUnderstanding rhino movement behavior, especially their recursive movements, holds significant promise for enhancing rhino conservation efforts, and protecting their habitats and the biodiversity they support. Here we investigate the daily, biweekly, and seasonal recursion behavior of rhinos, to aid conservation applications and increase our foundational knowledge about these important ecosystem engineers.MethodsUsing relocation data from 59 rhinos across northern Namibia and 8 years of sampling efforts, we investigated patterns in 24-h displacement at dawn, dusk, midday, and midnight to examine movement behaviors at an intermediate scale and across daily behavioral modes of foraging and resting. To understand recursion patterns across animals’ short and long-term ranges, we built T-LoCoH time use grids to estimate recursive movement by each individual. Comparing these grids to contemporaneous MODIS imagery, we investigated productivity’s influence on short-term space use and recursion. Finally, we investigated patterns of recursion within a year’s home range, measuring the time to return to the most intensively used patches.ResultsTwenty four-hour displacements at dawn were frequently smaller than 24-h displacements at dusk or at midday and midnight resting periods. Recursion analyses demonstrated that short-term recursion was most common in areas of median rather than maximum NDVI values. Investigated across a full year, recursion analysis showed rhinos most frequently returned to areas within 8–21 days, though visits were also seen separated by months likely suggesting seasonality in range use.ConclusionsOur results indicate that rhinos may frequently stay within the same area of their home ranges for days at a time, and possibly return to the same general area days in a row especially during morning foraging bouts. Recursion across larger time scales is also evident, and likely a contributing mechanism for maintaining open landscapes and browsing lawns of the savanna.

An Analytical Method for Calculating Short-Term Space Interception Probability

For small unguided space interceptors, the interception probability is an important index to evaluate their strike capability. However, the Monte Carlo (MC) based simulation method not only consumes a lot of computation time but also theoretically lacks interpretability. In this regard, this paper proposes an analytical method that can quickly and accurately calculate the short-term space interception probability. Firstly, by considering the effect of perturbation force on spacecraft as the effect of external force acceleration, the analytical calculation formula of the short-term state error covariance propagation of space target and interceptor is deduced. Next, by projecting the state error and rotating the coordinate system, the joint error distribution of the target and the interceptor in the calculation coordinate system at the time of closest approach (TCA) is obtained. Thereby convert the calculation of the space interception probability into the integral of the 2-dimensional probability density function in the circular domain. Then, the Laplace transform and Taylor expansion are used to obtain the exact power series expression and the maximum truncation error of the integral calculation, and the analytical calculation of the short-term space interception probability is realized. Finally, the effectiveness of the proposed method is verified by a simulation example. The proposed method can directly calculate the space interception probability according to the initial state error distribution of the target and interceptor, and the whole calculation process does not contain double integral operation. The proposed method has high computational efficiency, is suitable for on-orbit calculation, and provides effective support for the rapid evaluation of the strike capability of the space interceptor.

Biphasic Calcium Sulfate as an Alternative Grafting Material in Various Dental Applications.

Various grafting materials have been used in oral and periodontal surgeries to augment and rebuild bone intraorally. Calcium sulfate, a synthetic material, also known as an alloplast, has been used for decades in orthopedics, plastic surgery, and oncologic and maxillofacial surgeries for the treatment of osseous deficiencies caused by trauma or inflammation. Biphasic calcium sulfate provides benefits as a short-term space maintainer. Use of biphasic calcium sulfate as the sole material are limited to relatively small osseous defects surrounded by at least 3 bony walls (eg, extraction sockets). Thus, for augmenting large and more complex bone deficiencies Bond Apatite, a composite graft formulation, is indicated. This work will review the various clinical applications of Bond Apatite as an alternative to other graft materials.

Why space colonization will be fully automated

In this article we explore a possible scenario of space colonization and its consequences for planet Earth. We argue that in the short term space colonization will take place, but not in the form often presented in scientific and science fiction literature. Space colonies will be fully automated. There are three main reasons to believe that this is the most plausible scenario: 1) space mining is very profitable; 2) humans cannot survive for long periods of time in outer space limiting the prospects for human space colonization (HSC), and 3) automation is already a leading trend on Earth. Crewed missions will have an ancillary function, while machines or human/machine avatars will ‘inhabit’ other celestial bodies, in order to pursue economic enterprises and progress scientific discovery. We also propose some considerations on the speculative hypothesis, elaborated by a few leading futurists, that the development of machine-based learning Artificial Intelligence would lead to the so-called Singularity. In relation to this scenario, we argue that fully automated space colonization (FASC) could be a solution to prevent unwanted side effects of the Singularity, such as competition for resources between humankind and a hostile Artificial Intelligence.

Dry Immersion as a Ground-Based Model of Microgravity Physiological Effects.

Dry immersion (DI) is one of the most widely used ground models of microgravity. DI accurately and rapidly reproduces most of physiological effects of short-term space flights. The model simulates such factors of space flight as lack of support, mechanical and axial unloading as well as physical inactivity. The current manuscript gathers the results of physiological studies performed from the time of the model’s development. This review describes the changes induced by DI of different duration (from few hours to 56 days) in the neuromuscular, sensory-motor, cardiorespiratory, digestive and excretory, and immune systems, as well as in the metabolism and hemodynamics. DI reproduces practically the full spectrum of changes in the body systems during the exposure to microgravity. The numerous publications from Russian researchers, which until present were mostly inaccessible for scientists from other countries are summarized in this work. These data demonstrated and validated DI as a ground-based model for simulation of physiological effects of weightlessness. The magnitude and rate of physiological changes during DI makes this method advantageous as compared with other ground-based microgravity models. The actual and potential uses of the model are discussed in the context of fundamental studies and applications for Earth medicine.