Space Activities Research Articles

Space resource activities and the evolution of international space law

We are experiencing a period of renewed interest in human activities in outer space and, in particular, the return of humans to the Moon. Multiple lunar missions, including the NASA led Artemis project and the China and Russia International Lunar Research Station propose a sustained human presence on the Moon which will require in-situ resource extraction and usage. This article explores the likely impact of statements and actions by states on the future evolution of international space law in relation to space resource activities, highlighting the urgent need for greater clarity in the law regarding space resource activities. It will examine the relevant international law, domestic legislation, multilateral agreements, and recent international discussions concerning space resource activities. It concludes that the current international space law regime lacks clear laws regarding space resource activities and emphasises the importance of space law evolving in order to progress with industry and exploration.

Multifractal analysis of temporal and spatial characteristics of earthquakes in Eurasian seismic belt

Abstract Seismic activity has complexity and randomness, and its temporal and spatial distribution has complexity, stage, level, and inheritance. The study of the temporal and spatial distribution characteristics of seismic activity is of great significance to the understanding of the law of seismic activity, such as the law that the time series of seismicity in the seismic belt is consistent with the complexity of geographical structure, the prediction of seismic risk, and other research related to earthquake. This article selects the seismic data catalog of the whole Eurasian seismic belt as the research object. Based on the characteristics of the seismic geological environment and tectonic environment characteristics, the multifractal analysis method is used for the seismic data of the seismic activity directory. The results show that the seismic activity of seismic zones has obvious multifractal structure of complex in time series and spatial scales, which can well reveal the seismic characteristics of seismic activity in time and space. In terms of time series, the study area D ∞ {D}_{{\rm{\infty }}} decreases significantly with time and energy before the occurrence of a large earthquake, and the time series of seismic activity in the study area is highly complex and highly correlated with the geological structure. Spatially, the spatial distribution of seismic intensity in the study area is infinite and sparse, showing the characteristics of infinite clustering. Therefore, it can reveal the basic rule of seismic activity effectively and lay a certain theoretical foundation for earthquake prevention and control in this seismic zone.

Study on the design of old residential district landscape space renewal based on Cite Space from the perspective of big data

Abstract With the gradual improvement of people’s living standards, the requirements for a living environment are getting higher and higher. A good landscape space can facilitate people’s life, promote people’s interaction, provide places for leisure and entertainment, etc. Therefore, it is important to study the landscape space of residential communities. In this paper, we use Cite space software to analyze the research on landscape space literature in recent years, use keyword search to analyze people’s preference and demand for landscape space in the community, and use the data mining technology of plain Bayesian model to analyze the existing facilities and functions of the old residential community, to explore people’s preference, demand for landscape space, people’s activities in landscape space and The design strategies for the renewal of landscape spaces in old neighborhoods are proposed. For different types of landscape spaces, walking activity is one of the main activities, and environmental facilities are the main influencing factor to determine the type of activity. The highest proportion of sitting facilities is 24.6%, showing that people need them first to stay in the space. The proportion of green facilities is 19.8%, indicating that a good green environment is also an important factor that people are willing to stay. The proportion of landscape and green facilities is close to each other, and the attractiveness to people is similar. Waterscape is also the form of landscape that people love. Therefore, green landscape is an important factor to be considered in the design of landscape space, followed by rest facilities. Comfortable and pleasant community landscape design can enhance the happiness of people’s lives, and the contents discussed in this paper are of great significance to the design of landscape space.

Research on Space Occupancy, Activity Rhythm and Sexual Segregation of White-Lipped Deer (Cervus albirostris) in Forest Habitats of Jiacha Gorge on Yarlung Zangbo River Basin Based on Infrared Camera Technology.

The white-lipped deer (Cervus albirostris) is a rare and endangered species found in the Qinghai-Tibet Plateau in China. To understand the space occupancy, activity rhythm, and sexual segregation of the white-lipped deer, 24,096 effective photos and 827 effective videos were captured using infrared cameras from February 2020 to January 2022. The ecology and behavior of the white-lipped deer in Jiacha Gorge were studied in more detail using site occupancy models, relative abundance index, and other technologies and methods. The results show that The occupancy predicted by the model exceeds or approaches 0.5. The occupancy increases with greater altitude and with larger EVI values, while the detection rate increases with altitude only during spring and decreases with EVI values only in summer. The daily activity peaks for white-lipped deer were observed from 7:00 to 11:00 and 17:00 to 22:00, with annual activity peaks occurring from April to June and from September to November. From July to the following January, white-lipped deer mostly move in mixed-sex groups, while during the remainder of the year, they predominantly associate with individuals of the same sex. Climate, vegetation coverage, food resources, and human disturbance collectively influenced the behavior and habitat utilization of white-lipped deer. The foundational research conducted on white-lipped deer over the past two years is expected to enhance the basic understanding of white-lipped deer in the Qinghai-Tibet Plateau and contribute to future protection and management decisions.

Lipase-interfacial catalytic systems based on hybrid membranes constructed via electrospinning and gelation

Based on the core appeal of increasing the catalytic interface area, the innovation of structural interface design in the field of lipase catalysis is increasingly demanding. Inspired by wetting and infiltration of fabric, two radically new catalytic systems were developed by electrospinning and gelation. The water swelling (containing lipase) and oil infiltration (containing substrate) of hydrogel fiber-hydrophobic fiber hybrid membranes (hg-HMs) or hydrogel-hydrophobic block fiber hybrid membranes (hg-BHMs) created efficient water-oil interfaces for lipases. The specific activity of lipases inside hg-HMs and hg-BHMs reached 2.56-fold and 2.12-fold separately that in the macroscopic “oil-up/water-down” system, and 1.93-fold and 2.01-fold that in the emulsion catalytic system. The lipases in hg-HMs and hg-BHMs retained high efficiency along time (3.97-fold and 3.54-fold after 3 h of catalysis) with additionally excellent advantages in wide range of temperature and pH, and reusability. Excitingly, with increased pieces of membranes, the assembled hybrid membrane reactors (HMRs) showed a significant increase in catalytic efficiency but basically unchanged specific activity in finite space, which extremely magnified advantage over the control group. This study was a meaningful exploration of micro interfacial lipase catalytic system, which is helpful for further application of liquid-liquid interfacial catalysis in food industry.

ФОРМУВАННЯ БЕЗПЕЧНОЇ ПОВЕДІНКИ МОЛОДШИХ ШКОЛЯРІВ У ЦИФРОВОМУ ПРОСТОРІ

The article deals with the problem of the formation of safe behaviour of primary school students in the digital space. Primary school age is transitional in mastering the digital space. This is due to the age-related psychological characteristics of primary school students (qualitative changes in cognitive development; actualization of verbal and logical thinking; semantic memory, voluntary attention; the need for play, movement and external impressions, «clip thinking», etc.). Online risks are characterized as the following: communicative, content, consumer, technical, and internet addiction. It is emphasized that collision with communicative risks is the most serious issue for children compared to other types of online risks because it more often causes them tangible harm. The positive and negative aspects of the activities of primary school students in the digital space are determined. Positive aspects include the following: development of logical, operational thinking; the ability to predict; satisfaction of children’s need for external impressions; the ability to manage information flows; formation of creative thinking, etc. Negative aspects of activities of primary school students in the digital space are the following: problems with physical and mental health; inability to communicate with peers and adults in real life; decrease in empathy; the danger of virtual temptation of a child; loss of interest in learning, reading, manual labour; inability to distinguish virtual reality from real reality, etc. Educational tasks are singled out, the implementation of which will contribute to increasing the safety of primary school students in the digital space: combining the efforts of the state, parents and teachers to implement more effective mechanisms for the modernization of content for children in social networks; increasing the level of teachers’ digital competence; formation of parents’ digital competence; establishment of partnership interaction between parents and teachers, which is as a mutually coordinated and responsible activity based on dialogue, equal rights, voluntary participation and mutual interest of the parties; education of students’ responsible attitude towards their activities on the Internet. The conducted research does not cover all aspects of the raised multifaceted problem of the formation of safe behaviour of primary school students in the digital space. Further scientific research can be aimed at developing criteria, indicators and identifying the levels of formation of safe behaviour of primary school students in the digital space. Key words: safe behaviour, primary school students, digital space, online risks, positive and negative aspects of a child’s activity in the digital space.

Satellite Star Tracker Breadboard with Space Debris Detection Capability for LEO

This paper evaluates the possibility of having a star tracker device running space debris algorithms. A simple star tracker breadboard was developed to evaluate the possibility of having a device running both stellar identification and space debris algorithms. The breadboard was built with commercial off-the-shelf components, representing the current star tracker resolution and field of view. A star tracker device and space debris algorithms were implemented and tested, respectively: Tetra and ASTRiDE. The device concept was tested by taking pictures of the night sky with satellite streaks. Seeking to overcome such limitations, a dual-purpose star tracker with stars detection and optical debris detection capability is proposed. Star trackers are usually used in satellites for attitude determination and therefore have a vast potential to be a major tool for space debris detection. The rapid increase of space debris poses a risk to space activities, so it is vital to detect it. Ground-based radar and optical telescope techniques used for debris detection are limited by a size threshold, detecting only a tiny amount of the total, reason why evaluating the possibility of detecting them in space is of major importance.

The long hard road of reconciliation: Prefiguring cultures of peace through the transformation of representations of former combatants and identities of urban youth in Colombia

AbstractThe Colombian peace accords of 2016 involved a formal commitment to peace between the Revolutionary Armed Forces of Colombia‐People's Army (FARC‐EP in Spanish) and the national government. Despite this advance, societal reconciliation and sustainable peace remain key challenges. Through a longitudinal qualitative design, we investigate the encounter between former guerrilla members and urban university students in a community‐based educational space in rural Colombia. Drawing on a social representational approach, we focus on youth's representations of self (students), the remote other (former guerrilla members) and peace and reconciliation as they are produced before, during and after the encounter. Participants were 24 students enrolled in a service‐learning course at an urban university in Bogotá. Data collection included written narratives, audio‐visual material, focus groups and interviews. Thematic analyses show that as urban youth meet, spend time, and share space and common activities with the former combatants, both representations and identities are transformed. These transformations in self–other understandings unsettle hegemonic narratives supporting an ethos of conflict and introduce alternative representations that prefigure the consolidation of peace‐supporting counternarratives. Our results highlight both the resilience of hegemonic narratives and the long‐term effects of small‐scale educational knowledge encounters for producing agents of peace, recognising the other and prefiguring social change. Reconciliation as process must be thus understood as the uneven development of meaningful self–other interactionsthat recasts the social fabric as interdependent and builds shared intentionality for achieving sustainable peace.

Planetary protection: an international concern and responsibility

Planetary protection is a set of measures agreed upon at an international level to ensure the protection of scientific investigation during space exploration. As space becomes more accessible with traditional and new actors launching complex and innovative projects that involve robotics (including sample return) and human exploration, we have the responsibility to protect the pristine environments that we explore and our own biosphere. In this sense, the Committee on Space Research (COSPAR) provides the international standard for planetary protection as well as a forum for international consultation. COSPAR has formulated a Planetary Protection Policy with associated requirements for responsible space exploration. Although not legally binding under international law, the standard offered by the Policy with its associated requirements is internationally endorsed along with implementation guidelines supplied for reference in support States’ compliance with Article IX of the United Nations Outer Space Treaty of 1967. Indeed, States parties to the Outer Space Treaty (under Article VI) are responsible for any space activities in their countries, governmental and non-governmental. The main goal of this Policy is to avoid compromising the search for any lifeforms on other celestial bodies and to protect the Earth from a potential threat posed by extraterrestrial samples returned by an interplanetary mission. The COSPAR Planetary Protection Policy has defined five categories, depending on the target and objective of the specific space mission. Associated to these categories are requirements are various degrees of rigor in the contamination control applied. The Policy is assessed regularly and updated with input from new scientific findings and in conjunction with the fast-evolving space exploration milieu. The COSPAR Panel on Planetary Protection (PPP) is a designated international committee composed of scientists, agency representatives and space experts. Its role is to support and revise the COSPAR Policy and its related requirements (https://cosparhq.cnes.fr/scientific-structure/panels/panel-on-planetary-protection-ppp/). The Panel’s activities deal with the individual needs of a space mission while exercising swift care and expertise to ensure sustainable exploration of the Solar System.

The influence of mass media on the informational and psychological state of a person

The article examines the impact of mass media on the informational and psychological state of a person. The role of specific mechanisms and procedures for the protection of generally defined rights in connection with changes in Ukrainian legislation is investigated, and different approaches of specialists to the problem of liability in the Internet of Law are also mentioned. In the context of our topic, the article analyzes the Convention on the Protection of Human Rights and Fundamental Freedoms. The contentious nature of the means operating on the Internet determines the lack of legal mechanisms to control activities in the virtual space. We also analyze issues related to white relevant legislation, a clearly defined list of subjects of activity on the Internet and their legal status. Real courts against the rights of a person who are violated on the Internet cannot be fully ensured.
 In the article, we talk about the fact that network information processes are characterized by wide audience coverage, high efficiency, and a variety of forms of information influence due to the presence of feedback from the user to the information provider.
 Such a combination leads to the fact that global computer networks become a powerful tool of expression and formation of public opinion. In this capacity, they approach traditional means in terms of capabilities, and in some cases surpass them. Human life in the information society inevitably makes it more transparent for the state and society, so the desire to preserve information privacy is becoming more and more tangible. New technologies have significantly simplified the collection, processing, storage, and transmission of data, and on the other hand, they have created obvious threats of illegal circulation, which leads to violations of individual rights.
 We analyze online publications that are not limited by anything and most often abuse the freedom granted to them, which is why there is an urgent need for legal regulation of relations arising in the field of freedom of mass information. On the one hand, the basic law of the state enshrines the right to express one's opinion, freedom of thought and speech.

Cortically Evoked Movement in Humans Reflects History of Prior Executions, Not Plan for Upcoming Movement.

Human motor behavior involves planning and execution of actions, some more frequently. Manipulating probability distribution of a movement through intensive direction-specific repetition causes physiological bias toward that direction, which can be cortically evoked by transcranial magnetic stimulation (TMS). However, because evoked movement has not been used to distinguish movement execution and plan histories to date, it is unclear whether the bias is because of frequently executed movements or recent planning of movement. Here, in a cohort of 40 participants (22 female), we separately manipulate the recent history of movement plans and execution and probe the resulting effects on physiological biases using TMS and on the default plan for goal-directed actions using a timed-response task. Baseline physiological biases shared similar low-level kinematic properties (direction) to a default plan for upcoming movement. However, manipulation of recent execution history via repetitions toward a specific direction significantly affected physiological biases, but not plan-based goal-directed movement. To further determine whether physiological biases reflect ongoing motor planning, we biased plan history by increasing the likelihood of a specific target location and found a significant effect on the default plan for goal-directed movements. However, TMS-evoked movement during preparation did not become biased toward the most frequent plan. This suggests that physiological biases may either provide a readout of the default state of primary motor cortex population activity in the movement-related space, but not ongoing neural activation in the planning-related space, or that practice induces sensitization of neurons involved in the practiced movement, calling into question the relevance of cortically evoked physiological biases to voluntary movements.SIGNIFICANCE STATEMENT Human motor performance depends not only on ability to make movements relevant to the environment/body's current state, but also on recent action history. One emerging approach to study recent movement history effects on the brain is via physiological biases in cortically-evoked involuntary movements. However, because prior movement execution and plan histories were indistinguishable to date, to what extent physiological biases are due to pure execution-dependent history, or to prior planning of the most probable action, remains unclear. Here, we show that physiological biases are profoundly affected by recent movement execution history, but not ongoing movement planning. Evoked movement, therefore, provides a readout of the default state within the movement space, but not of ongoing activation related to voluntary movement planning.

Space food packaging: A review of its past, present and future materials and technologies

Abstract20 July 1969: approximately 240 000 mi away from Earth, two astronauts named Neil Armstrong and Edwin E. Aldrin Jr. landed on the moon. 20 October 2020: approximately 200 million miles away from Earth, the National Aeronautics and Space Administration (NASA) managed to land a spacecraft on an asteroid named Bennu and collect a sample from its surface. Sometime 2030s: approximately 34 million miles away from Earth, NASA is looking to successfully send humans to Mars. So, why is all this important? The effects of climate change are apparent on Earth today—temperatures around the world higher than normal, a rising sea level, natural disasters increasing in frequency and strength—and these effects continue to become ever more apparent as time goes on; thus, there is a need for solutions, which outer space has become one that is simultaneously grown in seriousness over the years. Colonizing space, traveling to distant planets and inhabiting them, these are definite possibilities for humans, as evidenced above by the remarkable progress NASA has made; however, one of the biggest obstacles NASA is dealing with in bringing those possibilities into fruition is their food system—all the actors and interactions within a food chain, meaning those who grow the food, those who process the food, those who transport the food, those who sell the food and finally, those who consume and dispose of the food. The shelf life of NASA's current food system will not last past 18 months in the unique environment of space, where there are the hazards of galactic cosmic rays, solar radiation and microgravity. Recognizing this—essentially recognizing that achieving such aforementioned feats would require a food system that can last much longer—NASA and others have constantly been researching and experimenting with their food system, ranging from how its food is grown, processed and preserved to the focus of this literature review: how it is packaged. Henceforth, the purpose of this literature review is to chronologically look at and discuss the major materials and technologies used in NASA's space food packaging of the past—the 1960s–1970s—look at and discuss those of the present—the 1980s–2000s—and finally, look ahead and discuss those of the future, entailing materials and technologies currently being worked on or considered for future use in NASA space missions. At that, here's to 60 years of activity in space.

MODERN DETERMINANTS OF FOREIGN INVESTMENT’ ACTIVATION IN THE INTERNATIONAL FINANCE AREA

The article defines the modern determinants of foreign investments’ activation in the international financial space. Foreign investments became a decisive driver for the formation of additional competitive advantages in the global capital market, ensuring the transfer of capital, knowledge, and technologies across borders. Foreign investment flows become the basis for forming a single system of relations and a new configuration of the world economy. The dynamics of foreign direct investment (FDI) by groups of countries and regions were analyzed. Over the past two decades, global FDI flows have grown rapidly, largely due to the intensification of investment activity in developing countries due to accelerating economic growth, increasing market potential, and using effective government policy tools to stimulate foreign investment. The specifics of the distribution of foreign direct investment between host countries have been determined in view of the consequences of the COVID-19 pandemic. The pandemic didn’t affect the countries’ ranking among the leaders in attracting and exporting FDI. Due to the export of FDI from Hong Kong (China) and Thailand, Asia became the only region where growth in FDI flows was recorded during the pandemic, and China became the largest investor in the world in 2020. As a result of quarantine restrictions and measures to counter the consequences of the pandemic, the lowest fall in FDI indicators over the last decade. The fact that the number of restrictive measures against foreign capital in 2022 increased sharply, mainly due to the war in Ukraine has been determined. Such procedures included sanctions against financial institutions; trade and transportation restriction measures; travel bans and asset freezes for hundreds of individuals and legal entities. The peculiarities of the recovery of FDI indicators in the post-Covid period are highlighted, and it is determined that in the near future, new risks may arise for the stable development of international investment activities in view of the war in Ukraine and a number of new shocks in the world economy.

Experimental validation of hydrazine reaction model through hypervelocity impact tests

The impact of debris on a satellite can result in a catastrophic event that not only destroys the spacecraft but it can also generate additional debris in space threatening the sustainability of space activities. Therefore, the design of spacecraft and its critical components require some understanding of the potential damage that can be inflicted by such event. For hydrazine fuel tank located outside the spacecraft, it is important to evaluate the conditions that may lead to its explosion in case of impact.This study aims at investigating through experimental tests, the temperature and pressure range for which hydrazine reacts under hypervelocity impact. The investigated tank conditions are representative of the temperature and pressure typically encountered for a satellite at the end of operational life i.e. with some residual remaining hydrazine in the tank. The main challenge of the project is related to the complexity and the hazard of the handling hydrazine. A specific test configuration and process have been developed for the safety of the operators and the surrounding environment. An ultra-fast valve was designed to isolate the target chamber right after the crossing of the projectile and before any hydrazine vapor comes back towards the gas-gun. The process prevents any direct contact of the laboratory personal with hydrazine. Four instrumented tests have been performed on small container impacted by stainless steel ball of 3 mm diameter at 6 km/s. A hydrazine reaction triggered by the impact has been detected on two tests with the highest temperature. In one case, the released energy has led to a catastrophic failure of the reservoir. These results are valuable for the calibration of a hydrazine thermochemical reaction model of satellite reservoir impact behavior even though the ignition process is not clearly established yet.

Participatory design practice, event (s) and the activation of public space

ABSTRACT Festivals and events make use of public space (s) as sites for people to gather in, or process through. In urban planning and design the activation and curation of flexible public spaces which enliven places has gained prominence. On one level, programming public space is eventified to make spaces more interesting and convivial. On the other, the process of participatory design is mediated through “events” that seek to disrupt conventional planning techniques and attract participation from a broader cross section of the community. In this paper, we bring together thinking from urban design and critical event studies to explore two live public space design projects that draw on the event concept in both described forms. Our findings demonstrate that the event format loosens social and spatial relations, opening possibilities for new configurations of public space that would otherwise have been difficult to envisage and realise. Second, we contend that facilitating planning and design processes through the lens of events helps involve a wider set of public(s) to participate and can also make the resultant public space itself more attractive for diverse range of users and uses.

Benchmarking and Simulation of Solid-Oxide Steam Electrolysis for Propellant Production in a Vacuum Chamber-Simulated Lunar Environment

Federal space agencies across the globe have prioritized development of in-situ resource utilization (ISRU) technology, such as propellants from lunar ice, to support space activities. High-temperature, solid oxide electrolysis cell (SOEC) systems integrated with an efficient balance-of-plant (BOP) have the potential to produce H2 and O2 at specific energy (kWhelec/kgH2) lower than conventional liquid-phase alkaline and PEM electrolysis systems, due to lower voltages for steam electrolysis (vs. liquid H2O). This NASA-sponsored collaboration explored the feasibility of achieving such low specific energy in a high-temperature SOEC system operating in a cryo-vacuum characteristic of permanently shadowed craters on the lunar surface where H2O ice can be found. A lab-scale »2.5-kWelec SOEC stack and BOP achieved a specific energy < 50 kWhelec/kgH2 at a production rate of > 0.075 kgH2/h operating in a cryo-vacuum chamber. System-level simulation models of the lab-scale SOEC stack were benchmarked with experimental tests and used to explore scaling of a system for lunar deployment. The lab-scale tests and scale-up modeling suggest a pathway to a MW-scale SOEC system that can achieve < 46 kWhelec/kgH2 with relatively low specific mass (kgsystem/(kgH2/h)).

Lifelong learning in community healthcare: Testing competence after learning activities in a blended learning space.

This study reports from a municipality in Norway that implemented a competence enhancement programme for all its institutional nursing staff during the COVID-19 pandemic to fill identified competence gaps. Many Norwegian municipalities are experiencing a demand for expanded community healthcare services due to an increase in elderly patients and patients with extensive and complex needs. At the same time, most municipalities are striving to recruit and keep competent health personnel. New ways of organising and increasing the competence of the workforce may help ensure that the healthcare delivered corresponds to patients' changing needs. Nursing staff were encouraged to complete targeted competence enhancing activities with the aim of enhancing their competence in identified areas. The learning activities were blended and consisted of e-learning courses, lectures, supervision, vocational training and meetings with a superior. Competence was measured before and after the competence enhancing activities (n = 96). The STROBE checklist was applied. The results provide insight into the competence development of registered nurses and assistant nurses in institutional community health services. They show that the implementation of a workplace-based blended learning programme improved competence significantly, especially for assistant nurses. Offering workplace-based competence enhancing activities seems to be a sustainable way of facilitating lifelong learning among nursing staff. Facilitation of learning activities in a blended learning space may enhance accessibility and increase the potential for participation. A combination of reorganisation of roles and simultaneous competence enhancing activities can ensure that both managers and nursing staff prioritise filling competence gaps.

The effects of green space and physical activity on muscle strength: a national cross-sectional survey with 128,759 Chinese adults.

Muscle strength is closely related to chronic noncommunicable diseases; specifically, a decline in handgrip strength (HS) is predominant globally. Exposure to green space-built environment components used for health intervention-reportedly decreases the risk of certain diseases and all-cause mortality. However, evidence in this area is limited. We aimed to explore the association between green space exposure and muscle strength and ascertain the combined effect of physical activity and green space exposure on muscle strength. Data from 128,759 participants (aged 20-79 years) were obtained using a complex stratified multistage probability cluster sampling design. The green space was assessed as normalized difference vegetation index (NDVI) data for a 500-m buffer zone based on the geolocation information of sampling sites. We used a questionnaire to investigate transportation, occupation, physical activity, leisure-time exercise behaviors, and sedentary time within a usual week of the preceding year. The outcome was low relative HS, defined as HS-to-body weight ratio, and the percentage of men and women with relative HS in the lower third. We defined adequate physical activity as 150 min of moderate-intensity or 75 min of vigorous physical activity per week and calculated the weighted proportion of participants with insufficient physical activity. Categorical variables of NDVI and physical activity were used as exposure variables and their interrelationship was evaluated in a generalized linear mixed model (GLMM) to estimate the odds ratios (ORs) and 95% confidence intervals (95% CI). We measured interaction on an additive or multiplicative scale using a GLMM to test the interaction between green space exposure and physical activity. All analyses were performed for the total sample and subgroups (urban and rural). The high NDVI group had a lower risk of low relative HS than the low NDVI group (OR [95% CI]: 0.92 [0.88-0.95]). The sufficient physical activity group had a lower risk of low relative HS than the insufficient physical activity group (OR [95% CI]: 0.85 [0.81-0.88]). There was an interactive effect on the additive scale (relative excess risk owing to interaction: 0.29, 95% CI 0.22-0.36, p < 0.001) between green space exposure and physical activity. High NDVI and adequate physical activity were protective factors against low relative HS in Chinese adults. Increasing green space exposure and physical activity together may have a greater potentiating effect on muscle strength improvement than these two protective factors individually. Green spaces should be incorporated into city design or built environments.

The oldest plans to scale of humanmade mega-structures.

Data on how Stone Age communities conceived domestic and utilitarian structures are limited to a few examples of schematic and non-accurate representations of various-sized built spaces. Here, we report the exceptional discovery of the up-to-now oldest realistic plans that have been engraved on stones. These engravings from Jordan and Saudi Arabia depict 'desert kites', humanmade archaeological mega-traps that are dated to at least 9,000 years ago for the oldest. The extreme precision of these engravings is remarkable, representing gigantic neighboring Neolithic stone structures, the whole design of which is impossible to grasp without seeing it from the air or without being their architect (or user, or builder). They reveal a widely underestimated mental mastery of space perception, hitherto never observed at this level of accuracy in such an early context. These representations shed new light on the evolution of human discernment of space, communication, and communal activities in ancient times.

Politik Antariksa: Proses dan Dinamika Politik di Balik Kegiatan Keantariksaan di Indonesia

The Unitary State of The Republic of Indonesia is a state which requires a mastery of space technology to be able to fulfill various needs and achieve national interests. Besides, it will increase the bargaining power of the state in the international political constellation. The study was aimed to the discussion of the processes, dynamics, and obstacles to the implementation of Indonesian space namely the limited willingness or political support that has an impact on the limited budget allocation for space activities, which encourages the actors behind Indonesian space activities who have motivation or interests, undertake various efforts to carry out activities space in Indonesia in order to gain political support in making policy decisions and budget allocations needed to achieve predetermined targets.