Urban shrinkage is becoming an increasingly common phenomenon in China.The research focus has been the identification,origin,and pattern of shrinking cities.Nevertheless,attention has also been paid to the problems as...Urban shrinkage is becoming an increasingly common phenomenon in China.The research focus has been the identification,origin,and pattern of shrinking cities.Nevertheless,attention has also been paid to the problems associated with urban shrinkage.The present study examines one typical shrinking city in China,specifically the Yichun District in Yichun City.To explore the matching relationship between residential and commercial spaces,this study analyzes supply and demand data,electricity consumption data and multi-source points of interest(POI)of residents.The results showed that the occupancy rate is not reduced in the context of urban shrinkage,and that the supply level of various commercial facilities is not in decline.Apart from leisure and entertainment facilities,the supply levels of catering,shopping and supporting facilities for life were noted to have improved.In reference to urban shrinkage,the matching relationship between residential and commercial space in the 5-min,10-min,and 15-min living circles mainly shifted to a highlevel equilibrium.The matching relationships between residential space and different types of commercial spaces change in both direction and magnitude.From the perspective of supply and demand,the spatial and temporal changes in the relationship relate to multiple factors,such as the level of economic development,the buiding age pattern,public transportation accessibility,aging,and residents’willingness to move.This study provides relevant data for managing urban shrinkage.It also helps improve the relationships between residential and commercial spaces and works to optimize the layout and structure of functional urban spaces.展开更多
With the advances of small satellite technology in commercial space sector,using small satellite networks to form a satellite constellation and conduct commercial operational services has entered into a vigorous phase...With the advances of small satellite technology in commercial space sector,using small satellite networks to form a satellite constellation and conduct commercial operational services has entered into a vigorous phase of development.As small satellite technology develops,problems in the operations of small satellite constellations are also gradually emerging.These include ground measurement and operational control systems for small satellite constellations,the commercial operational mode,support and the guarantee of laws and regulations related to small satellites.This report discusses the development of commercial space small satellite operation industrialization,explores the small satellite operational modes and technological innovation,proposes the commercial space industry chain to build the industry ecology.At the same time,it looks forward to the integration of space and terrestrial communication.It also calls on relevant organizations of China to speed up the process of space legislation,formulate the relevant policies to encourage the operations of small satellites in commercial space sector,and push China’s commercial space to a new level.展开更多
A group multiattribute decision-making model was proposed by implementing prospect theory,multi-attribute decision-making,group decision-making and entropy methods for the optimization in commercial space investment.F...A group multiattribute decision-making model was proposed by implementing prospect theory,multi-attribute decision-making,group decision-making and entropy methods for the optimization in commercial space investment.First,the decision-making function was decided using prospect theory by the preference of each expert to reach the comprehensive prospect value based on different investment options;second,expert decision weights were reached according to entropy method;third,the expert group decision-making information was congregated according to the group decision-making congregation algorithm to reach the most optimized investment option;finally,an example was given to demonstrate the feasibility and effectiveness of the method.This model com-prehensively takes the advantages of many methods to congregate experts'experiences and avoid the subjective influences,thus providing a scientific decision-making approach for the commercial space investment.展开更多
The subway stations of urban community type are not only main nodes in the urban traffic network, but also important places for peopled daily life. Widi the rapid development of urban metro and urban economy, the ...The subway stations of urban community type are not only main nodes in the urban traffic network, but also important places for peopled daily life. Widi the rapid development of urban metro and urban economy, the commercial space near tiie subway station has become the focus of urban planning and urban spatial development, and commercial self-oiganization pkys an important role in the development of commercial operations, commercial structures, and commercial scales, so how to make effective use of the inherent laws of the commercial space evolution, and further guide the rational development of community businesses needs more attention and research. This paper takes Chengdu Wannianchang Subway Station as an example to study the evolution stage, influencing factors, evolution characteristics and laws of the neatby commercial space. Moreover, suggestions were put forward such as coordinating competition and collaboration, optimizing space design and management, co-directional self-organization and heter-oiganizations, in order to provide a new reference for the healthy and ordedy development of the neighboring commefdal space near the subway stations of community type.展开更多
Commercial behavior in towns and cities is mainly divided into formal and informal behavior.Rapid urbanization has enabled formal commerce to develop more and more perfectly in towns,basically meeting the living needs...Commercial behavior in towns and cities is mainly divided into formal and informal behavior.Rapid urbanization has enabled formal commerce to develop more and more perfectly in towns,basically meeting the living needs of residents. However, because of problems such as urban history and management mechanism, informal commercial behavior formed by floating stallholders and other employed people is widespread in towns. Due to the characteristics of instability, flexibility and richness,informal commerce has gradually developed into an important business to attract residents and tourists. In this paper, the general characteristics of informal commercial behavior in towns, the characteristics of the urban public space bearing this kind of commerce, and residents' demand for informal commercial space were summarized, and then the optimization strategies of this kind of public space were put forward to help towns make full use of their scattered space, create diversified commercial places, and add vitality to urban space while providing residents and tourists with daily life needs and convenience.展开更多
Beijing Xianyukou Hutong(hutong refers to historical and cultural block in Chinese)occupies an important geographical location with unique urban fabric,and after years of renewal and protection,the commercial space of...Beijing Xianyukou Hutong(hutong refers to historical and cultural block in Chinese)occupies an important geographical location with unique urban fabric,and after years of renewal and protection,the commercial space of Xianyukou Street and has gained some recognition.This article Xianyukou takes commercial hutong in Beijing as an example,spatial analysis was carried out using methods like GIS kernel density method,space syntax after site investigation and research.Based on the street space problems found,this paper then puts forward strategies to improve and upgrade Xianyukou Street’s commercial space and improve businesses in Xianyukou Street and other similar hutong.展开更多
Space is becoming more accessible than ever before. Falling satellite manufacturing and launch costs have opened the door to new players to enter the market, disrupting the status quo. HTS and constellations have ente...Space is becoming more accessible than ever before. Falling satellite manufacturing and launch costs have opened the door to new players to enter the market, disrupting the status quo. HTS and constellations have entered the market and will lead to a lot more capacity at a lower price. But how this capacity will be optimally distributed remains a significant challenge. Earth Observation(EO) and Big Data are also areas of interest that are gaining grounds thanks to projects of 100 s if not 1,000 s of satellites that will have a lasting effect on manufacturing and launch markets.展开更多
At 11:00 p.m. on January 13, 2026, floodlights illuminated the launch pad at the Hainan Commercial Space Launch Site in Wenchang,south China’s Hainan Province. A Long March-8A (CZ-8A) carrier rocket lifted off with a...At 11:00 p.m. on January 13, 2026, floodlights illuminated the launch pad at the Hainan Commercial Space Launch Site in Wenchang,south China’s Hainan Province. A Long March-8A (CZ-8A) carrier rocket lifted off with a steady roar, its exhaust lighting up the night sky as it delivered a satellite into its designated orbit.The development of China’s first commercial space launch site has been striking. Since its inaugural launch in2024, it has completed 11 missions in less than 14 months—each a success.展开更多
Accessibility is a crucial indicator for evaluating the spatial rationalization of commercial facilities in an area,impacting both commercial development and service efficiency.The objective of this research is to ana...Accessibility is a crucial indicator for evaluating the spatial rationalization of commercial facilities in an area,impacting both commercial development and service efficiency.The objective of this research is to analyze the commercial space layout of Maotai Town in Guizhou Province,China,and to design an evaluation system for commercial space accessibility to enhance the efficiency of commercial space use.Firstly,POI(Point of Interest)Data Visualization Analysis will be employed to identify major commercial hotspots and areas not covered by their service reach.Secondly,the spatial accessibility of commercial spaces will be evaluated using Space Syntax and the Cost-Weighted Model in the topological grid dimension and geometric grid dimension.Finally,we will establish a Minimum Cumulative Resistance Model(MCR Model)based on the analysis results obtained to identify the resistance paths that tourists navigate within the research area.This method will provide a precise framework for evaluating the accessibility of commercial spaces throughout the area.展开更多
"If once together with the wind the Da Peng bird could rise,He would fly 90,000 miles up to the skies."These are the opening lines of a famous poem by Li Bai,a renowned poet of the Tang Dynasty(618-907).
The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic dem...The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic demand for transformation has emerged within the governance of outer space.Under the leadership of the new wave of space technology revolutions and commercial innovations,outer space governance will undergo a profound transformation.New theories in space law will emerge,engage in long-term competition,and ultimately contribute to the formation of a completely new governance structure.展开更多
This paper analyzes the launch price of the launch vehicles, domestic and abroad, studies the status and trend of the low cost launch vehicles, and introduces two measures to reduce the cost by means of evolved and di...This paper analyzes the launch price of the launch vehicles, domestic and abroad, studies the status and trend of the low cost launch vehicles, and introduces two measures to reduce the cost by means of evolved and disruptive technologies, utilizing the concept of low cost manufacturing and operating modes as well. This paper also analyzes the launch strategies for small satellites such as piggyback, networking launch, and single launch with a small launch vehicle(SLV). Finally, the development trend of reusable launch vehicles is discussed as well as the development prospects for China's reusable launch vehicle.展开更多
A legal regime for property rights of spacecraft in China is of great significance for expanding new-types of international collaboration and promoting commercial space development in China.China has so far yet to est...A legal regime for property rights of spacecraft in China is of great significance for expanding new-types of international collaboration and promoting commercial space development in China.China has so far yet to establish the relevant legal regime that governs the property rights of spacecraft,this has therefore resulted in the lack of rule and fundamental law with respect to domestic commercial space development and international space collaboration.In contrast,under legislation,the legal regime of property right registration for commercial spacecraft was introduced by Congress in the United States of America(the U.S.A.)in 1984.This effectively promoted the commercial space development in the U.S.A.Similarly,the Civil Code of the People’s Republic of China(effective as from January 1,2021)has specified a legal regime of property right registration for aircraft and ships thereby having effectuated the flourishing development of China’s aviation and maritime industries.Constructing a legal regime for the property rights of spacecraft in China is meant to include but not be limited to the establishment of registration regime of property rights,a distinct regime of ownership,and a registration regime for mortgage and financial leasing in connection with spacecraft.It is recommended that establishment of the registration and exchange centers for property rights of spacecraft be considered in the cities of Beijing and Shanghai.These would operate as centers managing the property right registration and transaction settlement associated with spacecraft along with their effective payloads so as to create the formation of a transaction mechanism for domestic spacecraft and their effective payload applications,thus providing a legal basis for activities such as financing,investment and transfer of ownership,involving spacecraft developed in China.This would drive China’s aerospace industry to be better integrated with the global aerospace market.Formation of a registration regime for property rights of spacecraft in China is advised to take into account a variety of legislation modus such as mandatory registration,optional registration,a mechanism taking effect as a result of registration or against a third party as a result of registration or with a coverage of certain crucial legislative aspects specifically the registration body,registration subject,registration type,validity of registration,types of right,etc.展开更多
Based on the concept of DIY, this paper demonstrates the essential potential of DIY manufacturing technology in the application of space equipment. According to the future space technology development trends, the futu...Based on the concept of DIY, this paper demonstrates the essential potential of DIY manufacturing technology in the application of space equipment. According to the future space technology development trends, the future spacecraft DIY idea and system standard are proposed. The standardized, modularized and serialized micro/nano-satellite DIY products are introduced. Finally, a commercial remote sensing satellite system based on spacecraft DIY is designed and its application prospect is analyzed.展开更多
1 Introduction The explosive growth of the global commercial space industry has brought low-Earth orbit(LEO)satellite constellation programs,such as Starlink and Qianfan,to a pivotal stage in the evolution of space de...1 Introduction The explosive growth of the global commercial space industry has brought low-Earth orbit(LEO)satellite constellation programs,such as Starlink and Qianfan,to a pivotal stage in the evolution of space development toward commercialization.1 Traditional space missions have stringent requirements for mission risk and payload mass,while commercial satellite design emphasizes economic viability.2 This systemic transformation has not only redefined the operational framework of aerospace engineering but also opened critical pathways for the spatial application of emerging photovoltaic technologies.Perovskite solar cells(PSCs),endowed with high specific power and cost-effectiveness,have demonstrated competitive potential against silicon-based counterparts in terrestrial applications.3 Crucially,their application prospects are particularly promising in the space domain,where device mass,power density,and cost efficiency are critical design constraints.展开更多
Utilizing commercial off-the-shelf(COTS) components in satellites has received much attention due to the low cost. However, commercial memories suffer severe reliability problems in radiation environments. This paper ...Utilizing commercial off-the-shelf(COTS) components in satellites has received much attention due to the low cost. However, commercial memories suffer severe reliability problems in radiation environments. This paper studies the low-density parity-check(LDPC) coding scheme for improving the reliability of multi-level-cell(MLC) NAND Flash memory in radiation environments. Firstly, based on existing physical experiment works, we introduce a new error model for heavyion irradiations; secondly, we explore the optimization of writing voltage allocation to maximize the capacity of the storage channel; thirdly, we design the degree distribution of LDPC codes that is specially suitable for the proposed model; finally, we propose a joint detection-decoding scheme based on LDPC codes, which estimates the storage channel state and executes an adaptive log-likelihood ratio(LLR) calculation to achieve better performance. Simulation results show that, compared with the conventional LDPC coding scheme, the proposed scheme may almost double the lifetime of the MLC NAND Flash memory in radiation environments.展开更多
This study examines the notion of placeness of city center commercial plazas within the context of globalization.Contemporary improvements of commercial public spaces aim to globalize the city image at the expense of ...This study examines the notion of placeness of city center commercial plazas within the context of globalization.Contemporary improvements of commercial public spaces aim to globalize the city image at the expense of local identity and regional characteristics.Although recognized as a major landmark that reflects the globalized image of Nanjing City,Deji Plaza cannot establish a unique sense of place and identity for the community.By adopting a humanist perspective,this study emphasizes peopled experience,perception,and emotional needs of the place as crucial dimensions for improving the relationship between people and commercial spaces.A structural equation model is used to develop a measurement system that evaluates the interaction between the different dimensions of placeness.Findings indicate that optimized locations and environmental characteristics of city center commercial plazas may enhance their image but transform them into consumption spaces for tourists rather than public places for the local community.The results of this study deepen the current understanding and assessment tools of placeness in city commercial public spaces,which are relevant to Nanjing City and similar contexts.展开更多
There seems to be a paucity in extant literature that assesses the relationship between Safety Management Systems (SMS) and High Reliability Theory (HRT) behavior process of mindful organizing (MO) among aerospaceorga...There seems to be a paucity in extant literature that assesses the relationship between Safety Management Systems (SMS) and High Reliability Theory (HRT) behavior process of mindful organizing (MO) among aerospaceorganizations. There could be benefits for organizational safety by exploring this relationship in high-reliabilityorganizations (HROs) like the aerospace industry. Using a modified Safety Organizing Scale (SOS) by Vogus andSutcliffe (2007) and a validated SMS scale, the relationship between SMS and MO was measured. The perceptionsof a cross-section of respondents from commercial airlines with SMS and commercial space licensees without SMSin the United States (U.S.) was assessed. A four-factor model of MO had acceptable fit. A model showing the relationship between SMS and MO had good fit and showed a high significant strength of relationship (r = 0.82,p = 0.000) with a big effect size. There were also significant differences in mean responses among managementpersonnel and non-management personnel on the MO factor “sensitivity to operations” and the result suggestsmanagers were better at identifying personnel with skills and knowledge to ensure safer task accomplishmentthan non-management personnel. The study results suggest that the SMS requirements for commercial airlines inthe U.S. can enrich the identification and understanding of MO factors and it may be beneficial for the commercial space industry to formally adopt SMS. Future research studies may include direct comparisons in multipleaerospace organizations using a larger sample size to determine the overall understanding of MO factors and howit affects SMS.展开更多
With the spotlight growing on musical theater in China's major cities,theatergoing is playing an increasing role in more and more young fans'lives.At 650 Hankou Road off People's Square in the heart of Sha...With the spotlight growing on musical theater in China's major cities,theatergoing is playing an increasing role in more and more young fans'lives.At 650 Hankou Road off People's Square in the heart of Shanghai stands China's"Vertical Broadway"-the Asia Building.Transformed from a commercial space in 2019,this 21-tory building now houses 22 small theater venues known as"star spaces."展开更多
基金Under the auspices of the National Natural Science Foundation of China(No.42171191,41771172)China Postdoctoral Science Foundation(No.2018M641760)Education Department of Jilin Province(No.JJKH20201173KJ)。
文摘Urban shrinkage is becoming an increasingly common phenomenon in China.The research focus has been the identification,origin,and pattern of shrinking cities.Nevertheless,attention has also been paid to the problems associated with urban shrinkage.The present study examines one typical shrinking city in China,specifically the Yichun District in Yichun City.To explore the matching relationship between residential and commercial spaces,this study analyzes supply and demand data,electricity consumption data and multi-source points of interest(POI)of residents.The results showed that the occupancy rate is not reduced in the context of urban shrinkage,and that the supply level of various commercial facilities is not in decline.Apart from leisure and entertainment facilities,the supply levels of catering,shopping and supporting facilities for life were noted to have improved.In reference to urban shrinkage,the matching relationship between residential and commercial space in the 5-min,10-min,and 15-min living circles mainly shifted to a highlevel equilibrium.The matching relationships between residential space and different types of commercial spaces change in both direction and magnitude.From the perspective of supply and demand,the spatial and temporal changes in the relationship relate to multiple factors,such as the level of economic development,the buiding age pattern,public transportation accessibility,aging,and residents’willingness to move.This study provides relevant data for managing urban shrinkage.It also helps improve the relationships between residential and commercial spaces and works to optimize the layout and structure of functional urban spaces.
文摘With the advances of small satellite technology in commercial space sector,using small satellite networks to form a satellite constellation and conduct commercial operational services has entered into a vigorous phase of development.As small satellite technology develops,problems in the operations of small satellite constellations are also gradually emerging.These include ground measurement and operational control systems for small satellite constellations,the commercial operational mode,support and the guarantee of laws and regulations related to small satellites.This report discusses the development of commercial space small satellite operation industrialization,explores the small satellite operational modes and technological innovation,proposes the commercial space industry chain to build the industry ecology.At the same time,it looks forward to the integration of space and terrestrial communication.It also calls on relevant organizations of China to speed up the process of space legislation,formulate the relevant policies to encourage the operations of small satellites in commercial space sector,and push China’s commercial space to a new level.
文摘A group multiattribute decision-making model was proposed by implementing prospect theory,multi-attribute decision-making,group decision-making and entropy methods for the optimization in commercial space investment.First,the decision-making function was decided using prospect theory by the preference of each expert to reach the comprehensive prospect value based on different investment options;second,expert decision weights were reached according to entropy method;third,the expert group decision-making information was congregated according to the group decision-making congregation algorithm to reach the most optimized investment option;finally,an example was given to demonstrate the feasibility and effectiveness of the method.This model com-prehensively takes the advantages of many methods to congregate experts'experiences and avoid the subjective influences,thus providing a scientific decision-making approach for the commercial space investment.
基金Sponsored by Technology Research Program of Sichuan Province of China(2016JY0111)
文摘The subway stations of urban community type are not only main nodes in the urban traffic network, but also important places for peopled daily life. Widi the rapid development of urban metro and urban economy, the commercial space near tiie subway station has become the focus of urban planning and urban spatial development, and commercial self-oiganization pkys an important role in the development of commercial operations, commercial structures, and commercial scales, so how to make effective use of the inherent laws of the commercial space evolution, and further guide the rational development of community businesses needs more attention and research. This paper takes Chengdu Wannianchang Subway Station as an example to study the evolution stage, influencing factors, evolution characteristics and laws of the neatby commercial space. Moreover, suggestions were put forward such as coordinating competition and collaboration, optimizing space design and management, co-directional self-organization and heter-oiganizations, in order to provide a new reference for the healthy and ordedy development of the neighboring commefdal space near the subway stations of community type.
基金Supported by National Natural Science Foundation of China (51768026)Humanities and Social Sciences Project of Colleges and Universities in Jiangxi Province,China (YC2021-S225)。
文摘Commercial behavior in towns and cities is mainly divided into formal and informal behavior.Rapid urbanization has enabled formal commerce to develop more and more perfectly in towns,basically meeting the living needs of residents. However, because of problems such as urban history and management mechanism, informal commercial behavior formed by floating stallholders and other employed people is widespread in towns. Due to the characteristics of instability, flexibility and richness,informal commerce has gradually developed into an important business to attract residents and tourists. In this paper, the general characteristics of informal commercial behavior in towns, the characteristics of the urban public space bearing this kind of commerce, and residents' demand for informal commercial space were summarized, and then the optimization strategies of this kind of public space were put forward to help towns make full use of their scattered space, create diversified commercial places, and add vitality to urban space while providing residents and tourists with daily life needs and convenience.
基金Beijing Zheshe Base Construction Project:Research on Urban Renewal and Comprehensive Environmental Management of the Old Community in Beijing(110051360022XN121-05)。
文摘Beijing Xianyukou Hutong(hutong refers to historical and cultural block in Chinese)occupies an important geographical location with unique urban fabric,and after years of renewal and protection,the commercial space of Xianyukou Street and has gained some recognition.This article Xianyukou takes commercial hutong in Beijing as an example,spatial analysis was carried out using methods like GIS kernel density method,space syntax after site investigation and research.Based on the street space problems found,this paper then puts forward strategies to improve and upgrade Xianyukou Street’s commercial space and improve businesses in Xianyukou Street and other similar hutong.
文摘Space is becoming more accessible than ever before. Falling satellite manufacturing and launch costs have opened the door to new players to enter the market, disrupting the status quo. HTS and constellations have entered the market and will lead to a lot more capacity at a lower price. But how this capacity will be optimally distributed remains a significant challenge. Earth Observation(EO) and Big Data are also areas of interest that are gaining grounds thanks to projects of 100 s if not 1,000 s of satellites that will have a lasting effect on manufacturing and launch markets.
文摘At 11:00 p.m. on January 13, 2026, floodlights illuminated the launch pad at the Hainan Commercial Space Launch Site in Wenchang,south China’s Hainan Province. A Long March-8A (CZ-8A) carrier rocket lifted off with a steady roar, its exhaust lighting up the night sky as it delivered a satellite into its designated orbit.The development of China’s first commercial space launch site has been striking. Since its inaugural launch in2024, it has completed 11 missions in less than 14 months—each a success.
文摘Accessibility is a crucial indicator for evaluating the spatial rationalization of commercial facilities in an area,impacting both commercial development and service efficiency.The objective of this research is to analyze the commercial space layout of Maotai Town in Guizhou Province,China,and to design an evaluation system for commercial space accessibility to enhance the efficiency of commercial space use.Firstly,POI(Point of Interest)Data Visualization Analysis will be employed to identify major commercial hotspots and areas not covered by their service reach.Secondly,the spatial accessibility of commercial spaces will be evaluated using Space Syntax and the Cost-Weighted Model in the topological grid dimension and geometric grid dimension.Finally,we will establish a Minimum Cumulative Resistance Model(MCR Model)based on the analysis results obtained to identify the resistance paths that tourists navigate within the research area.This method will provide a precise framework for evaluating the accessibility of commercial spaces throughout the area.
文摘"If once together with the wind the Da Peng bird could rise,He would fly 90,000 miles up to the skies."These are the opening lines of a famous poem by Li Bai,a renowned poet of the Tang Dynasty(618-907).
文摘The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic demand for transformation has emerged within the governance of outer space.Under the leadership of the new wave of space technology revolutions and commercial innovations,outer space governance will undergo a profound transformation.New theories in space law will emerge,engage in long-term competition,and ultimately contribute to the formation of a completely new governance structure.
文摘This paper analyzes the launch price of the launch vehicles, domestic and abroad, studies the status and trend of the low cost launch vehicles, and introduces two measures to reduce the cost by means of evolved and disruptive technologies, utilizing the concept of low cost manufacturing and operating modes as well. This paper also analyzes the launch strategies for small satellites such as piggyback, networking launch, and single launch with a small launch vehicle(SLV). Finally, the development trend of reusable launch vehicles is discussed as well as the development prospects for China's reusable launch vehicle.
文摘A legal regime for property rights of spacecraft in China is of great significance for expanding new-types of international collaboration and promoting commercial space development in China.China has so far yet to establish the relevant legal regime that governs the property rights of spacecraft,this has therefore resulted in the lack of rule and fundamental law with respect to domestic commercial space development and international space collaboration.In contrast,under legislation,the legal regime of property right registration for commercial spacecraft was introduced by Congress in the United States of America(the U.S.A.)in 1984.This effectively promoted the commercial space development in the U.S.A.Similarly,the Civil Code of the People’s Republic of China(effective as from January 1,2021)has specified a legal regime of property right registration for aircraft and ships thereby having effectuated the flourishing development of China’s aviation and maritime industries.Constructing a legal regime for the property rights of spacecraft in China is meant to include but not be limited to the establishment of registration regime of property rights,a distinct regime of ownership,and a registration regime for mortgage and financial leasing in connection with spacecraft.It is recommended that establishment of the registration and exchange centers for property rights of spacecraft be considered in the cities of Beijing and Shanghai.These would operate as centers managing the property right registration and transaction settlement associated with spacecraft along with their effective payloads so as to create the formation of a transaction mechanism for domestic spacecraft and their effective payload applications,thus providing a legal basis for activities such as financing,investment and transfer of ownership,involving spacecraft developed in China.This would drive China’s aerospace industry to be better integrated with the global aerospace market.Formation of a registration regime for property rights of spacecraft in China is advised to take into account a variety of legislation modus such as mandatory registration,optional registration,a mechanism taking effect as a result of registration or against a third party as a result of registration or with a coverage of certain crucial legislative aspects specifically the registration body,registration subject,registration type,validity of registration,types of right,etc.
文摘Based on the concept of DIY, this paper demonstrates the essential potential of DIY manufacturing technology in the application of space equipment. According to the future space technology development trends, the future spacecraft DIY idea and system standard are proposed. The standardized, modularized and serialized micro/nano-satellite DIY products are introduced. Finally, a commercial remote sensing satellite system based on spacecraft DIY is designed and its application prospect is analyzed.
文摘1 Introduction The explosive growth of the global commercial space industry has brought low-Earth orbit(LEO)satellite constellation programs,such as Starlink and Qianfan,to a pivotal stage in the evolution of space development toward commercialization.1 Traditional space missions have stringent requirements for mission risk and payload mass,while commercial satellite design emphasizes economic viability.2 This systemic transformation has not only redefined the operational framework of aerospace engineering but also opened critical pathways for the spatial application of emerging photovoltaic technologies.Perovskite solar cells(PSCs),endowed with high specific power and cost-effectiveness,have demonstrated competitive potential against silicon-based counterparts in terrestrial applications.3 Crucially,their application prospects are particularly promising in the space domain,where device mass,power density,and cost efficiency are critical design constraints.
基金supported by the National Basic Research Project of China(973)(2013CB329006)National Natural Science Foundation of China(NSFC,91538203)the new strategic industries development projects of Shenzhen City(JCYJ20150403155812833)
文摘Utilizing commercial off-the-shelf(COTS) components in satellites has received much attention due to the low cost. However, commercial memories suffer severe reliability problems in radiation environments. This paper studies the low-density parity-check(LDPC) coding scheme for improving the reliability of multi-level-cell(MLC) NAND Flash memory in radiation environments. Firstly, based on existing physical experiment works, we introduce a new error model for heavyion irradiations; secondly, we explore the optimization of writing voltage allocation to maximize the capacity of the storage channel; thirdly, we design the degree distribution of LDPC codes that is specially suitable for the proposed model; finally, we propose a joint detection-decoding scheme based on LDPC codes, which estimates the storage channel state and executes an adaptive log-likelihood ratio(LLR) calculation to achieve better performance. Simulation results show that, compared with the conventional LDPC coding scheme, the proposed scheme may almost double the lifetime of the MLC NAND Flash memory in radiation environments.
基金This work was supported by the National Natural Science Foundation of China[Grant Nos.51678130 and 51678131].
文摘This study examines the notion of placeness of city center commercial plazas within the context of globalization.Contemporary improvements of commercial public spaces aim to globalize the city image at the expense of local identity and regional characteristics.Although recognized as a major landmark that reflects the globalized image of Nanjing City,Deji Plaza cannot establish a unique sense of place and identity for the community.By adopting a humanist perspective,this study emphasizes peopled experience,perception,and emotional needs of the place as crucial dimensions for improving the relationship between people and commercial spaces.A structural equation model is used to develop a measurement system that evaluates the interaction between the different dimensions of placeness.Findings indicate that optimized locations and environmental characteristics of city center commercial plazas may enhance their image but transform them into consumption spaces for tourists rather than public places for the local community.The results of this study deepen the current understanding and assessment tools of placeness in city commercial public spaces,which are relevant to Nanjing City and similar contexts.
文摘There seems to be a paucity in extant literature that assesses the relationship between Safety Management Systems (SMS) and High Reliability Theory (HRT) behavior process of mindful organizing (MO) among aerospaceorganizations. There could be benefits for organizational safety by exploring this relationship in high-reliabilityorganizations (HROs) like the aerospace industry. Using a modified Safety Organizing Scale (SOS) by Vogus andSutcliffe (2007) and a validated SMS scale, the relationship between SMS and MO was measured. The perceptionsof a cross-section of respondents from commercial airlines with SMS and commercial space licensees without SMSin the United States (U.S.) was assessed. A four-factor model of MO had acceptable fit. A model showing the relationship between SMS and MO had good fit and showed a high significant strength of relationship (r = 0.82,p = 0.000) with a big effect size. There were also significant differences in mean responses among managementpersonnel and non-management personnel on the MO factor “sensitivity to operations” and the result suggestsmanagers were better at identifying personnel with skills and knowledge to ensure safer task accomplishmentthan non-management personnel. The study results suggest that the SMS requirements for commercial airlines inthe U.S. can enrich the identification and understanding of MO factors and it may be beneficial for the commercial space industry to formally adopt SMS. Future research studies may include direct comparisons in multipleaerospace organizations using a larger sample size to determine the overall understanding of MO factors and howit affects SMS.
文摘With the spotlight growing on musical theater in China's major cities,theatergoing is playing an increasing role in more and more young fans'lives.At 650 Hankou Road off People's Square in the heart of Shanghai stands China's"Vertical Broadway"-the Asia Building.Transformed from a commercial space in 2019,this 21-tory building now houses 22 small theater venues known as"star spaces."
