检索结果-内蒙古大学图书馆

AIAA science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Trent, Douglas J. Edwards, Stephen J. Chappell, Michael B. Lugo, Rafael A. Andreini, Matthew J. Advanced Concepts Office NASA Marshall Space Flight Center HuntsvilleAL United States Science & Technology Office NASA Marshall Space Flight Center HuntsvilleAL United States Atmospheric Flight Entry Systems Branch NASA Langley Research Center HamptonVA United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In characterizing the trade space available for enabling human Mars missions, NASA’s Mars Architecture Team (MAT) has continues to developed a collection of concepts to assess the capabilities and constraints presented by a family of large Mars Chemical Transportation Elements (MACHETE). The purpose of this paper is to extend the MACHETE family with a new Large Vertical Lander (LVL) concept to increase our knowledge of the transportation trade space. The LVL is designed as a dedicated lander system capable of delivering a separate Mars Ascent Vehicle (MAV) fully-fueled to the surface of Mars. The addition of this concept enables exploring architecture alternatives that do not require either in-situ ascent propellant production or pre-deployment and subsequent surface transfer of ascent propellant. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： NASA

来源：评论

学校读者我要写书评

暂无评论

Synchronous Multi-Modal Semantic Communication System With Packet-Level Coding

引用

IEEE Transactions on Wireless Communications 2025年第5期24卷 3684-3697页

作者： Tian, Yun Ying, Jingkai Qin, Zhijin Jin, Ye Tao, Xiaoming Peking University School of Electronics Beijing100091 China Tsinghua University Department of Electronic Engineering Beijing100084 China State Key Laboratory of Space Network and Communications Beijing100084 China Beijing National Research Center for Information Science and Technology Beijing100084 China

Although the semantic communication with joint semantic-channel coding design has shown promising performance in transmitting data of different modalities over physical layer channels, the synchronization and packet-level forward error correction (FEC) of multimodal semantics have not been well studied. Synchronizing multimodal features in both the semantic and time domains is challenging due to the independent design of semantic encoders. In this paper, we take the facial video and speech transmission as an example and propose a Synchronous Multi-modal Semantic Communication System with Packet-Level Coding (SyncSC). To achieve semantic and time synchronization, 3D Morphable Mode (3DMM) coefficients and text are transmitted as semantics. We propose a semantic codec that achieves similar reconstruction quality with lower bandwidth. The visual-guided speech synthesis is designed to synchronize video, text and speech. We propose a packet-Level FEC method for video semantics, called PacSC, that maintains visual quality even at high packet loss rates. For text packets, a text packet loss concealment module, called TextPC, based on Bidirectional Encoder Representations from Transformers (BERT) is proposed, which improves the performance of traditional FEC methods. Simulation results show that SyncSC reduces transmission overhead while ensuring high-quality synchronous transmission of video and speech over the packet loss network. © 2002-2012 IEEE.

关键词： Semantic communication Synchronization Encoding Packet loss Receivers Speech recognition Streaming media Forward error correction Transmitters Speech synthesis

来源：评论

学校读者我要写书评

暂无评论

Fine-mapping and candidate gene identification for ***-4B showing potential in increasing productive tiller number and yield in wheat

引用

The Crop Journal 2025年第2期13卷 480-489页

作者： Jiajun Liu Tongzhu Wang Yuxin Lan Zhiyuan Zhang Jianing You Lei Wu Xinrong Hu Li Yin Yanlin Liu Huaping Tang Qiantao Jiang Qiang Xu Guoyue Chen Pengfei Qi Yunfeng Jiang Yuming Wei Youliang Zheng Chunji Liu Jian Ma State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China/Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130SichuanChina Dazhou Key Laboratory of Agricultural Resources Development and Ecological Conservation in Daba Mountain/Research Center of Sichuan Old Revolutionary Areas Development Sichuan University of Arts and ScienceDazhou 635000SichuanChina Industrial Crop Research Institute Sichuan Academy of Agricultural SciencesChengdu 610300SichuanChina School of Agriculture Henan Institute of Science and TechnologyXinxiang 453003HenanChina

Productive tiller number(PTN)is a pivotal trait that significantly influences wheat grain *** date,there have been limited reports on the cloning of genes that regulate PTN in *** quantitative trait locus(QTL)***-4B,associated with PTN,was previously mapped between the markers KASP-1 and KASP-3 on the chromosome ***,utilizing 12 newly developed markers and phenotypic data of PTN from recombinants identified within this interval,***-4B was further fine-mapped to a 2.58 Mb interval on wheat chromosome arm *** this interval,we identified 14 genes with high-confidence and 32 genes with low-confidence.A 0.17 Mb deletion fragment contained TraesCS4B03G0092600 and TraesCS4B03G0093100,which were assigned as candidate genes for ***,***-4B had potential to enhance both PTN and grain yield in *** this locus would support the development of wheat cultivars with increased grain yield.

关键词： Wheat Productive tiller number Grain yield Candidate genes

来源：评论

学校读者我要写书评

暂无评论

Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

引用

Earth and Planetary Physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan N.Muafiry Teguh N.Pratama Angga Y.Putra Suraina Gatot H.Pramono Sidik T.Wibowo Febrylian F.Chabibi Umar A.Ahmad Wildan P.Tresna Asnawi Research Center for Climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia Directorate of Laboratory Management Facilities and Science and Technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics Laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research Center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(BIG) JakartaIndonesia Research Center for Photonics Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia Department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude ***-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this *** generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROTI maps of Ina-CORS are ***,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther ***,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionosphe

关键词： Equatorial Plasma Bubble(EPB) GNSS receivers’network Indonesia Continuously Operating Reference Station(Ina-CORS) ionospheric map Rate of TEC change index(ROTI)map

来源：评论

学校读者我要写书评

暂无评论

Analysis of the global Earth’s outgoing radiation reconstruction from disk-integrated measurements 6

Analysis of the global Earth’s outgoing radiation reconstru...

引用

6th International Conference on Geoscience and Remote Sensing Mapping, GRSM 2024

作者： Yu, Zhitong Jin, Yin Ye, Hanlin Zhou, Mengxiong Liu, Guang Guo, Huadong Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing100094 China Key Laboratory of Digital Earth Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing100094 China International Center for Climate and Environment Science Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100029 China

ISBN: (纸本)9781510688018

The Earth’s outgoing radiation is one of the key parameters in the global climate change. This study aims to analyze the feasibility of reconstructing global Earth’s outgoing radiation using disk-integrated measurements. We utilized Clouds and the Earth’s Radiant Energy System (CERES) Synoptic Radiative Fluxes and Clouds (SYN) datasets to simulate the disk-integrated measurements from sensors onboard a Moon-based platform, a satellite at the Sun-Earth Lagrange L1 point, the L2 point, and a polar orbit at the altitude of 380000 km. The reconstruction method is proposed based on the disk-integrated measurements. The results indicated that while the reconstructed radiation at the Sun-Earth L1 point is generally higher than the true value, the radiation reconstructed by the Moon-based and high polar orbit platforms is closer to the true value. Furthermore, we found that the sampling time interval significantly affects the reconstruction accuracy, with intervals of less than 4 hours introducing minimal errors. Our findings suggest that disk-integrated measurements are capable of effectively reconstructing Earth’s global radiation, offering significant guidance for the planning of future missions. © 2025 SPIE.

关键词： Tropics

来源：评论

学校读者我要写书评

暂无评论

Development of a high-resolution near-surface meteorological forcing dataset for the Third Pole region

引用

science China Earth sciences 2025年第4期68卷 1274-1290页

作者： Yaozhi JIANG Wenjun TANG Kun YANG Jie HE Changkun SHAO Xu ZHOU Hui LU Yingying CHEN Xin LI Jiancheng SHI School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing100084China National Tibetan Plateau Data Center State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China Tsinghua University(Department of Earth System Science)-Xi’an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping Beijing100084China National Space Science Center Chinese Academy of SciencesBeijing100190China

Recently,the Third Pole(TP)region has experienced rapid environmental *** data are essential for hydrometeorological and ecological applications but still have large uncertainties on the TP owing to the heterogeneous land surface,complex terrain,and sparse weather *** this study,a long-term(1979–2020)high-resolution(1/30°)meteorological forcing dataset for the TP(TPMFD)was developed,as a sister to the widely used China Meteorological Forcing Dataset(CMFD).The TPMFD comprises seven components necessary for driving land surface *** have previously contributed precipitation and downward shortwave radiation data for the TPMFD,and this study presents the development of five other components and focuses on validations for all ***,2-meter air temperature,2-meter specific humidity,10-meter wind speed,and surface air pressure were generated by combining the fifth-generation atmospheric reanalysis for European center for Medium-Range Weather Forecasts(ERA5),a short-term high-resolution atmospheric simulation,and in situ observations,and the downward longwave radiation was calculated using semi-physical *** cross-validation and independent-validation demonstrated that most variables in the developed dataset outperformed those in widely used reanalysis datasets,including ERA5,ERA5-Land,and the Global Land Data Assimilation System(GLDAS).This dataset is expected to be beneficial for climate analyses and modeling applications of land-surface processes on the TP.

关键词： Meteorological data Third Pole High-resolution Data downscaling and merging

来源：评论

学校读者我要写书评

暂无评论

Wide null steering of realistic antenna array

Results in Engineering

引用

Results in Engineering 2025年 26卷

作者： Jin, Xin-Ran Zhang, Qing Kong, Ling-Bing Ding, Guo-Wen Wang, Shen-Yun Research Center of Applied Electromagnetics Nanjing University of Information Science and Technology Nanjing210044 China Shanghai Academy of Spacecraft Technology Beijing R&D Center Beijing100041 China Center of Space Exploration Ministry of Education Chongqing University Chongqing400030 China

In this paper, a wide-null pattern synthesizing and steering technique for realistic antenna array is proposed by minimizing the power radiation in the nulling space. The optimal excitation distribution (OED) to form an array pattern with described wide null is obtained by minimizing the ratio of the power radiated in the desired nulling angular space to the total input power of the antenna array. The ratio functioning as the performance index is built up with the extracted electric fields radiated by each embedded antenna element on the discrete spots of a selected far-field arc segment. By minimizing the performance index, a null pattern with described width and direction can be obtained. By selecting a different far-field arc segment covering a desired nulling angular space and rebuilding up the performance index, the pattern null with desired width and direction can be steered. For simplicity, the proposed wide null synthesizing and steering technique is validated with a realistic linear patch antenna array. Simulated and measured results indicate that the realized null patterns are in good agreement with the predetermined ones. © 2025

关键词： Steerable antennas

来源：评论

学校读者我要写书评

暂无评论

Estimating diurnal variability of photosynthetically available radiation at the ocean surface from EPIC observations

Estimating diurnal variability of photosynthetically availab...

引用

Active and Passive Remote Sensing of Oceans, Seas, and Lakes 2024

作者： Tan, Jing Frouin, Robert Hwang, Deuk-Jae Choi, Jong-Kuk Murakami, Hiroshi Scripps Institution of Oceanography University of California La Jolla San DiegoCA United States Korea Ocean Satellite Center Korea Institute of Ocean Science & Technology Busan Korea Republic of Earth Observation Research Center Japan Aerospace Exploration Agency Tsukuba Japan

ISBN: (数字)9781510682719

ISBN: (纸本)9781510682702

Current satellite radiation products from polar-orbiting sensors like MODIS, SGLI, VIIRS, and OCI provide only daily averaged quantities, missing critical diurnal variations. These fluctuations in light energy, ranging from none to ample throughout the day, significantly influence photosynthetic communities, impacting carbon export, nutrient cycling, and ecosystem functions. Incorporating hourly changes in phytoplankton light absorption and irradiance, as shown with GOCI data, has enhanced estimates of net primary productivity. However, the global oceans cannot be fully observed from a single geostationary platform, especially at high latitudes. EPIC, positioned at the first Lagrange point (L1) about 1.5 million km from Earth, offers a unique advantage by simultaneously capturing the entire sunlit ocean with high temporal resolution, enabling detailed observation of evolving systems and diurnal phenomena. Unlike polar orbiters, EPIC provides better coverage at low and middle latitudes, effectively mitigates Sun glint, and offers adequate views of polar regions. Utilizing EPIC data, we estimate hourly photosynthetically available radiation (PAR) over the global ocean. The algorithm is developed and validated through radiative transfer simulations under realistic conditions. Comparisons with geostationary AHI and GOCI data show strong performance. The diurnal PAR estimates, when combined with other ocean color products, are expected to advance studies of aquatic photosynthesis and biogeochemistry. © 2025 SPIE.

关键词： Light absorption

来源：评论

学校读者我要写书评

暂无评论

A Comparative Assessment of Evolvable Martian ISRU Propellant Production for Future Human Missions

A Comparative Assessment of Evolvable Martian ISRU Propellan...

引用

AIAA science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Hoffman, Stephen J. Chappell, Michael B. Oleson, Steven R. Turnbull, Elizabeth R. Congiardo, Jared F. The Aerospace Corporation HoustonTX77058 United States Technical Management Science and Technology Office Marshall Space Flight Center HuntsvilleAL35812 United States NASA Glenn Research Center ClevelandOH44107 United States NASA Kennedy Space Center Merritt Island FL32899 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In 2022, NASA released its "Moon to Mars Strategy and Objectives Development" document, containing top-level goals and objectives designed to create a blueprint for sustained human presence and exploration throughout the solar system. One objective in this "blueprint" calls for the demonstration of "…Mars ISRU capabilities to support an initial human Mars exploration campaign." NASA is looking at both the benefits and liens of this concept, as one of several trade space aspects under consideration, for inclusion in the overall architecture of the human exploration of Mars. This paper summarizes results from a series of Martian ISRU-focused trade studies from 2023 and 2024. These studies cover five different approaches to providing propellants for returning crew and equipment from the surface of Mars, using several different combinations of propellants delivered (from Earth) and produced from Martian feedstock material. For comparison purposes, the same ISRU infrastructure elements were used across all options wherever possible. The equipment mass, power, operational complexity, and time needed to produce some or all of these propellants have been quantified and compared when used in a common mission scenario. Analysis results for each option are discussed. Performance parameters for these options are compared side-by-side and observations made, including the positive and negative aspects of each case. The possibility of evolving from a simpler ISRU case to more complex cases that would potentially lead to more sustainable operations are also discussed. While no single case emerged as "better" in all aspects when compared to the others, there are distinct advantages and disadvantages that did emerge when comparing the results generated from a common set of assumptions for all cases. Consequently, specific mission objectives may determine which of these advantages or disadvantages are important for choosing among the cases that could benefit any particular mission or

关键词： NASA

来源：评论

学校读者我要写书评

暂无评论

Convenient and effective self-similar amplification with dispersion management of linear NPE femtosecond fiber laser

Convenient and effective self-similar amplification with dis...

引用

2024 Advanced Fiber Laser Conference, AFL 2024

作者： Song, Yi Zhou, Yuanzhu Li, Zhili Pan, Xinjian Guo, Chunyu School of Electronic Information University of Electronic Science and Technology of China Zhongshan Institute Zhongshan528402 China School of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China National and Local Joint Engineering Research Center of Space Optoelectronics Technology Changchun University of Science and Technology Changchun130022 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

A convenient and effective simpler self-similarity amplification system based on a linear nonlinear polarization evolution (NPE) femtosecond fiber laser with dispersion management is introduced. The fully polarization-maintaining NPE fiber laser oscillator outputs pulses with a duration of 585 fs, which is perfect for going straight into the self-similar amplification without additional preshaping devices. Using a ~ 3 m Yb-doped fiber as an amplifier, we compare the differences in the self-similarity evolution between the forward and backward pumping pairs. After passing through the self-similarity amplifier, a parabola-like pulse was obtained with the spectral width up to 38.7 nm, which was compressed to 104 fs. This optimized approach is crucial for achieving efficient, compact, and reliable all-fiber self-similar amplifiers. © 2025 SPIE.

关键词： Fiber lasers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：