Space: Science & Technology最新文献_第9页

Accurate Solar Wind Speed Prediction with Multimodality Information 利用多模态信息精确预测太阳风速度

Space: Science & Technology Pub Date : 2022-08-10 DOI: 10.34133/2022/9805707

Yanru Sun, Zongxia Xie, Yanhong Chen, Qinghua Hu

{"title":"Accurate Solar Wind Speed Prediction with Multimodality Information","authors":"Yanru Sun, Zongxia Xie, Yanhong Chen, Qinghua Hu","doi":"10.34133/2022/9805707","DOIUrl":"https://doi.org/10.34133/2022/9805707","url":null,"abstract":"When the solar wind passes over the Earth, it will cause geomagnetic storms, affect short-wave communications, and threaten the safety of pipelines such as electricity and oil. Accurate prediction of the solar wind speed will allow people to make adequate preparations to avoid wasting resources and affecting people’s life. Most existing methods only use single-modality data as input and do not consider the information complementarity between different modalities. This paper proposes a multimodality prediction (MMP) method that jointly learns vision and sequence information in a unified end-to-end framework for solar wind speed prediction. MMP includes three modules: Vmodule, Tmodule, and Fusion module. Vmodule, which uses pretrained GoogLeNet, is proposed to learn visual representations from the extreme ultraviolet (EUV) images. Tmodule combining one-dimensional CNN with bidirectional long short-term memory (BiLSTM) is applied for learning sequence representation from multivariate time series. Finally, a multimodality fusion method is applied to improve the overall performance. We adopt the EUV images observed by the solar dynamics observatory (SDO) satellite and the OMNIWEB dataset measured at Lagrangian point 1 (L1) to experiment. Comparative experiments have shown that the proposed MMP achieves best performance in many metrics. The ablation experiments also verify the validity of each module and the rationality of the hyperparameter setting.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128113158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Overview of Activities: ARES-III and LEARN Analog Missions in the LunAres Hab 活动概述:ARES-III和LEARN模拟任务在月球居住地

Space: Science & Technology Pub Date : 2022-08-03 DOI: 10.34133/2022/9763959

S. Bouriat, Matej Poliaček, Jacob Smith

{"title":"Overview of Activities: ARES-III and LEARN Analog Missions in the LunAres Hab","authors":"S. Bouriat, Matej Poliaček, Jacob Smith","doi":"10.34133/2022/9763959","DOIUrl":"https://doi.org/10.34133/2022/9763959","url":null,"abstract":"Progress is being made on human Lunar and Martian missions by space agencies and private organisations around the world, with the aims of establishing reliable long-duration architectures. Complementing this, research is being carried out under controlled and isolated conditions within simulated space habitats, to gain insights into the effects of such conditions on the research subjects and their impacts on crews’ wellbeing and success. This paper provides an overview of the experiments conducted during two separate 15-day missions—one Martian and one Lunar—conducted in the LunAres Research Base in Piła, Poland, in 2018. Some activities were common between the two crews; others were only carried out by one. Using the same methodology, both collected cognitive function, environmental, physiological, and inventory data, resulting in a larger dataset allowing comparisons between the two missions in terms of varying human factors. Experiments conducted by the Lunar crew included the following: effects of consuming lyophilised food on oral health and saliva production, influence of isolation on hearing capability, feelings on security in the isolated habitat, and research into earthworm growth in different soil compositions. The Mars mission analysed physical performances of the crew and compared them to performances realised during similar activities in Mars Research Desert Station missions and the impact of confinement on their efficiency performing a remote operation of a rover. For each piece of research, an overview of the background, methodology, results, and conclusions is given, referencing the resulting papers. In addition, nonresearch activities are included for completeness and context.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126033694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Surrogate-Assisted Evolutionary Algorithm for Space Component Thermal Layout Optimization 空间构件热布局优化的代理辅助进化算法

Space: Science & Technology Pub Date : 2022-07-30 DOI: 10.34133/2022/9856362

Lei Han, Handing Wang, Shuo Wang

{"title":"A Surrogate-Assisted Evolutionary Algorithm for Space Component Thermal Layout Optimization","authors":"Lei Han, Handing Wang, Shuo Wang","doi":"10.34133/2022/9856362","DOIUrl":"https://doi.org/10.34133/2022/9856362","url":null,"abstract":"In space engineering, the electronic component layout has a very important impact on the centroid stability and heat dissipation of devices. However, the expensive thermodynamic simulations in the component thermal layout optimization problems bring great challenges to the current optimization algorithms. To reduce the cost, a surrogate-assisted evolutionary algorithm with restart strategy is proposed in this work. The algorithm is consisted of the local search and global search. A restart strategy is designed to make the local search jump out of the local optimum promptly and speed up the population convergence. The proposed algorithm is compared with two state-of-the-art algorithms on the CEC2006, CEC2010, and CEC2017 benchmark problems. The experiment results show that the proposed algorithm has a high convergence speed and excellent ability to find the optimum in the expensive constrained optimization problems under the very limited computation budget. The proposed algorithm is also applied to solve an electronic component layout optimization problem. The final results demonstrate the good performance of the proposed algorithm, which is of great significance to the component layout optimization.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129735773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

LEO Mega Constellations: Review of Development, Impact, Surveillance, and Governance 狮子座大星座:发展、影响、监督和治理的回顾

Space: Science & Technology Pub Date : 2022-07-30 DOI: 10.34133/2022/9865174

Jingrui Zhang, Yifan Cai, Chenbao Xue, Zhirun Xue, Han Cai

{"title":"LEO Mega Constellations: Review of Development, Impact, Surveillance, and Governance","authors":"Jingrui Zhang, Yifan Cai, Chenbao Xue, Zhirun Xue, Han Cai","doi":"10.34133/2022/9865174","DOIUrl":"https://doi.org/10.34133/2022/9865174","url":null,"abstract":"The rapid development of Low Earth Orbit (LEO) mega constellations has significantly contributed to several aspects of human scientific progress, such as communication, navigation, and remote sensing. However, unrestrained deployment of constellations has also strained orbital resources and increased spacecraft congestion in LEO, which seriously affects the safety of in-orbit operations of many space assets. For the long-term and sustainable development of space activities in LEO regions, space environment stability must be maintained using more rational surveillance and governance mechanisms. This review contributes to the research gap and facilitates the development of LEO mega constellations. First, the current development of typical LEO mega constellations is reviewed, followed by the analysis of the impact of LEO mega constellations in terms of astronomical observation, spacecraft safety in orbit, and space environment evolution. Then, two main solutions to conduct the challenges raised by LEO mage constellations are elaborated: one is to ensure the safety operation of spacecraft using space surveillance infrastructures and space situational awareness technologies, and the other is to accelerate the deorbit of constellation satellites at the end of life based on postmission disposal and active removal methods. Finally, the future development and potential research directions of LEO mega constellations are prospected.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129027718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Centered Error Entropy-Based Sigma-Point Kalman Filter for Spacecraft State Estimation with Non-Gaussian Noise 基于中心误差熵的非高斯噪声航天器状态估计西格玛点卡尔曼滤波

Space: Science & Technology Pub Date : 2022-07-29 DOI: 10.34133/2022/9854601

Baojian Yang, Hao Huang, Lu Cao

引用次数: 5

The Effect of Martian Ionospheric Dispersion on SAR Imaging 火星电离层色散对SAR成像的影响

Space: Science & Technology Pub Date : 2022-07-26 DOI: 10.34133/2022/9860932

Bo Wang, Xijin Luo, Qinghong Sheng, Zhijun Yan

{"title":"The Effect of Martian Ionospheric Dispersion on SAR Imaging","authors":"Bo Wang, Xijin Luo, Qinghong Sheng, Zhijun Yan","doi":"10.34133/2022/9860932","DOIUrl":"https://doi.org/10.34133/2022/9860932","url":null,"abstract":"When passing through the ionosphere, the high-frequency (HF) pulse signal of the Mars Exploration Radar is affected by the dispersion effect error, which results in signal attenuation and time delay and brings about a phase advance in such a way that the echo cannot be matched and filtered. In this paper, a high-order phase model is built to overcome the above problems and enable echo matching and filtering. Most studies on the dispersion effect approximate the additional phase after the effect, assuming that the ionosphere is a thin-layer structure. In this paper, an effective model for the HF waveband is constructed to analyze the change of signal propagation paths in the ionosphere. The additional phase is expanded in a Taylor series and retained these expansions as high-order terms to calculate the cumulative additional phase along the path. We show the range-offset variables of signal frequency, bandwidth, and electron density, simulate the effects of the ionosphere under different conditions, and conclude that the model can effectively estimate Mars without considering the effects of magnetic fields and anomalous solar activity and the effect of the ionosphere on synthetic aperture radar (SAR) echoes. The results obtained using ray tracing calculations are different from those obtained by simplifying assumptions, and we can simulate the Martian ionospheric effects by the former.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"322 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132172721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Entry, Descent, and Landing of China’s Tianwen-1 Mars Mission 中国“天文一号”火星探测器的进入、下降和着陆

Space: Science & Technology Pub Date : 2022-06-30 DOI: 10.34133/2022/9809054

Zezhou Sun, W. Rao

引用次数: 2

Research Advancements in Key Technologies for Space-Based Situational Awareness 天基态势感知关键技术研究进展

Space: Science & Technology Pub Date : 2022-06-18 DOI: 10.34133/2022/9802793

Beichao Wang, Shuang Li, Jinzhen Mu, Xiaolong Hao, Wenshan Zhu, Jiaqian Hu

{"title":"Research Advancements in Key Technologies for Space-Based Situational Awareness","authors":"Beichao Wang, Shuang Li, Jinzhen Mu, Xiaolong Hao, Wenshan Zhu, Jiaqian Hu","doi":"10.34133/2022/9802793","DOIUrl":"https://doi.org/10.34133/2022/9802793","url":null,"abstract":"The space environment has become highly congested due to the increasing space debris, seriously threatening the safety of orbiting spacecraft. Space-based situational awareness, as a comprehensive capability of threat knowledge, analysis, and decision-making, is of significant importance to ensure space security and maintain normal order. Various space situational awareness systems have been designed and launched. Data acquisition, target recognition, and monitoring constituting key technologies make major contributions, and various advanced algorithms are explored as technical supports. However, comprehensive reviews of these technologies and specific algorithms rarely emerge. It disadvantages the future development of space situational awareness. Therefore, this paper further reviews and analyzes research advancements in key technologies for space situational awareness, emphasizing target recognition and monitoring. Many mature and emerging methods are presented for these technologies while discussing application advantages and limitations. Specially, the research prospects of multiagent and synergetic constellation technologies are expected for future situational awareness. This paper indicates the future directions of the key technologies, aiming to provide references for space-based situational awareness to realize space sustainability.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123180362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Potential of Dragon’s Blood as a Space Radiation Protectant Especially on Brain-Liver Bystander Effect 龙血作为空间辐射保护剂的潜力，特别是对脑-肝旁观者效应的影响

Space: Science & Technology Pub Date : 2022-06-13 DOI: 10.34133/2022/9791283

Bo Li, T. Li, Chu Han, Yuanyuan Liu, Xia Zhong, Yanlu Cao, Yulin Deng

{"title":"Potential of Dragon’s Blood as a Space Radiation Protectant Especially on Brain-Liver Bystander Effect","authors":"Bo Li, T. Li, Chu Han, Yuanyuan Liu, Xia Zhong, Yanlu Cao, Yulin Deng","doi":"10.34133/2022/9791283","DOIUrl":"https://doi.org/10.34133/2022/9791283","url":null,"abstract":"During space manned missions, radiation is a serious health risk. Radiation can not only directly cause damage to target organs but also trigger side effects to affect nontarget organs. Dragon’s Blood (DB) is a traditional Chinese Dai medicine that has been proven to exhibit radioprotective effects in our lab previously. It can alleviate brain damage, hematopoietic dysfunction, and gastrointestinal damage caused by radiation in rats, but its mechanism of action is not clear yet. In order to study the effect of brain irradiation on the damage to the liver and the protective effects of Dragon’s Blood, herein, liquid chromatography coupled with a mass spectrometer was used to analyze the total differential protein expression in the rat liver after 30 Gy Co60γ-ray whole-brain irradiation with/without administration of Dragon’s Blood for 10 days before irradiation. A total of 4557 proteins were identified in the rat liver. A total of 299 coexpressed differential proteins were screened in the RAD/CON group indicating that brain radiation significantly affected the liver’s metabolic system (such as drug and arachidonic acid metabolism), chemical carcinogenesis, and peroxisome process. A total of 85 differential proteins were screened in the DB/RAD group. Results indicated that Dragon’s Blood significantly regulated the expression of 26 proteins to normal levels (Msrb2, Txnrd2, Samm50, Pir, Pex11a, etc.) mainly through regulating the metabolism and redox homeostasis process. The results of molecular docking and network pharmacology found that the main effective radiation protection components in Dragon’s Blood are natural chalcones, flavan, and phenolic derivatives.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"85 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132480862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Impacts of CMEs on Earth Based on Logistic Regression and Recommendation Algorithm 基于Logistic回归和推荐算法的日冕物质抛射对地球的影响

Space: Science & Technology Pub Date : 2022-04-22 DOI: 10.34133/2022/9852185

Yurong Shi, Jingjing Wang, Yanhong Chen, Siqing Liu, Yanmei Cui, X. Ao

引用次数: 0

Space: Science &amp; Technology最新文献

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