Subjects: Astronomy submitted time 2024-03-22 Cooperative journals: 《天文学进展》
Abstract： Pulsars have significant academic and application value in fields such as astrophysical evolution, physics, timing, deep space autonomous navigation, and gravitational wave detection, making pulsar survey and application one of the current hot topics in the astronomical community. In order to explore the current research status and future development trends in the field of pulsar survey and application, 964 relevant articles were screened from the Web of Science (WOS) database. Building upon the analysis of core articles, in-depth exploration was conducted utilizing data analysis and visualization methods. The study results reveal that research in the field of pulsar survey and application has progressed through initial exploration and steady development phases, and is currently experiencing vigorous growth. Close collaboration among nations has led to the formation of three major research groups in this field. Pulsar survey and application research are anticipated to yield significant scientific research value and practical application outcomes in the future, such as direct detection of gravitational waves and advancements in deep space autonomous navigation, thereby further enriching and diversifying the research domain of pulsars.
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-19 Cooperative journals: 《中国科学院院刊》
Abstract： China is the largest wheat producer and consumer in the world. Wheat production is of great importance for national food security and is greatly influenced by the spatial variation of climatic variables, soils, cultivars, etc. The un-deciphered wheat genome has prevented the development of map-based cloning and molecular design breeding technology for a long time. Supported by the Chinese Academy of Sciences Strategic Priority Program “Innovative System of Designer Breeding by Molecular Modules”, Chinese scientists made a significant contribution in deciphering the wheat genome. Moreover, some new wheat varieties have been successfully developed using the theory of “multi-module assembly breeding”. This paper presents these important achievements and future research development directions.
Subjects: Astronomy >> Astrophysical processes submitted time 2021-03-04 Cooperative journals: 《天文研究与技术》
Abstract： 控制系统能衔接、集成和管理射电望远镜的软硬件系统。控制系统中的序列化工具可将射电望远镜中不同设备、操作系统、编程语言和网络之间传输的信息进行编码和解码，增强系统之间数据的传输效率。本文分析和比较了三款二进制序列化工具Msgpack、Protobuf和Flatbuffers的编码原理及特性，并通过一个实例测试了它们的序列化数据大小、序列化时间和CPU利用率。结果表明，Msgpack的综合性能优于Protobuf和Flatbuffers，适用于周期长、需求易变的射电望远镜系统之间传输信息的编码和解码。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-11-13 Cooperative journals: 《天文研究与技术》
Abstract：无线电监测表明，手机与基站通信产生的干扰信号会影响射电天文观测数据，为了抑制射频干扰，天文学家提出屏蔽站内电子设备、设置无线电宁静区等无线电管理办法，其中的手机信号因易移动、基数大而难于监测和管理。然而，开启手机的飞行模式或关机可以降低射频干扰。基于此，本文设计和开发了一款基于Android系统的手机干扰管理APP，采用定位技术来自动判别手机是否处于无线电宁静区，以提醒用户管理手机，并记录用户在宁静区内的操作。测试结果表明，当用户处于无线电宁静区时，APP能主动提醒用户开启飞行模式或关机，有效降低手机信号对天文观测数据的影响。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-04-01 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the problem of low accuracy in the use of traditional recommendation algorithm in mobile environment, a matrix factorization algorithm based on context-aware was proposed. Based on the basic matrix factorization algorithm, the algorithm performed unknown score prediction by incorporating global bias and context bias. The advantage of this algorithm is that, on the one hand, the matrix factorization was used to make the scale of the matrix much smaller than the original scoring matrix; on the other hand, the algorithm fully integrated the influence of the situational elements on the score, making the prediction score more accurate. Experiments on the LDOS-CoMoDa dataset show that the proposed algorithm outperforms the user-based collaborative filtering algorithm, the basic matrix factorization algorithm and Baseline prediction algorithm.
Subjects: Astronomy >> Astrophysical processes submitted time 2017-10-20 Cooperative journals: 《天文研究与技术》
Abstract：针对中性大气的物理属性以及大气折射对射电望远镜指向的影响进行了模型分析和计算，以改进型的“三段式”标准指向改正模型为基拙，着重研究了由大气折射造成高阶指向误差的改正方案，目的是不断提高射电望远镜的指向精度，尤其针对大口径、高分辨率的射电望远镜。在此模型的基拙上，模拟南山观测基地的气候特征，给出合理的计算结果。通过分析和评估这些结果与射电望远镜指向精度的要求，为将来大口径射电望远镜的指向修正提供参考
Subjects: Astronomy >> Astrophysical processes submitted time 2017-09-26 Cooperative journals: 《天文研究与技术》
Abstract：随着射电天文的发展，大口径天线的角分辨率越来越高，对天线指向精度的要求高达In量级。由于天线伺服驱动力矩的脉动造成低频谐振，传统PI(D)调节器难以满足更高指向跟踪的需求。结合射电望远镜的工况、伺服控制目的及控制器设计原则，采用一种基于线性自抗扰控制算法，并应用于某天线位置环仿真。分析结果表明，该算法不仅有良好的动态性能和控制精度，而且有较强的鲁棒性。
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