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PSRDP:A Parallel Processing Method for Pulsar Baseband Data

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Research in Astronomy and Astrophysics 2024年第1期24卷 300-310页

作者： ya-zhou zhang Hai-Long zhang Jie Wang Xin-Chen Ye Shuang-Qiang Wang Xu Du Han Wu Ting zhang Shao-Cong Guo Meng zhang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China National Astronomical Data Center Beijing 100101China Southeast University Nanjing 211189China School of Cyber Science and Engineering Qufu Normal UniversityQufu 273165China

To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data,we designed and implemented a pulsar baseband data processing algorithm(PSRDP)based on GPU parallel computing *** can perform operations such as baseband data unpacking,channel separation,coherent dedispersion,Stokes detection,phase and folding period prediction,and folding integration in GPU *** tested the algorithm using the J0437-4715 pulsar baseband data generated by the CASPSR and Medusa backends of the Parkes,and the J0332+5434 pulsar baseband data generated by the self-developed backend of the Nan Shan Radio *** obtained the pulse profiles of each baseband *** experimental analysis,we have found that the pulse profiles generated by the PSRDP algorithm in this paper are essentially consistent with the processing results of Digital Signal Processing Software for Pulsar Astronomy(DSPSR),which verified the effectiveness of the PSRDP ***,using the same baseband data,we compared the processing speed of PSRDP with DSPSR,and the results showed that PSRDP was not slower than DSPSR in terms of *** theoretical and technical experience gained from the PSRDP algorithm research in this article lays a technical foundation for the real-time processing of QTT(Qi Tai radio Telescope)ultra-wide bandwidth pulsar baseband data.

关键词： (stars:)pulsars:general methods:data analysis techniques:miscellaneous

A Cross-matching Service for Data Center of Xinjiang Astronomical Observatory

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Research in Astronomy and Astrophysics 2024年第1期24卷 119-127页

作者： Hai-Long zhang Jie Wang Xin-Chen Ye Wan-Qiong Wang Jia Li ya-zhou zhang Xu Du Han Wu Ting zhang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China National Astronomical Data Center Beijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Cross-matching is a key technique to achieve fusion of multi-band astronomical catalogs. Due to different equipment such as various astronomical telescopes, the existence of measurement errors, and proper motions of the celestial bodies, the same celestial object will have different positions in different catalogs, making it difficult to integrate multi-band or full-band astronomical data. In this study, we propose an online cross-matching method based on pseudo-spherical indexing techniques and develop a service combining with high performance computing system(Taurus) to improve cross-matching efficiency, which is designed for the Data Center of Xinjiang Astronomical Observatory. Specifically, we use Quad Tree Cube to divide the spherical blocks of the celestial object and map the 2D space composed of R.A. and decl. to 1D space and achieve correspondence between real celestial objects and spherical patches. Finally, we verify the performance of the service using Gaia 3 and PPMXL catalogs. Meanwhile, we send the matching results to VO tools-Topcat and Aladin respectively to get visual results. The experimental results show that the service effectively solves the speed bottleneck problem of crossmatching caused by frequent I/O, and significantly improves the retrieval and matching speed of massive astronomical data.

关键词： virtual observatory tools astronomical databases:miscellaneous catalogs

UWLPIPE:Ultra-wide Bandwidth Low-frequency Pulsar Data Processing Pipeline

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Research in Astronomy and Astrophysics 2024年第7期24卷 145-157页

作者： ya-zhou zhang Hai-Long zhang Jie Wang Jian Li Xin-Chen Ye Shuang-Qiang Wang Xu Du Han Wu Ting zhang Shao-Cong Guo Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China National Astronomical Data Center Beijing 100101China Southeast University Nanjing 211189China

For real-time processing of ultra-wide bandwidth low-frequency pulsar baseband data,we designed and implemented an ultra-wide bandwidth low-frequency pulsar data processing pipeline(UWLPIPE)based on the shared ringbuffer and GPU parallel *** runs on the GPU cluster and can simultaneously receive multiple 128 MHz dual-polarization VDIF data packets preprocessed by the front-end *** aligning the dual-polarization data,multiple 128M subband data are packaged into PSRDADA baseband data or multi-channel coherent dispersion filterbank data,and multiple subband filterbank data can be spliced into wideband data after time *** used the Nanshan 26 m radio telescope with the L-band receiver at964~1732 MHz to observe multiple ***,we processed the data using DSPSR software,and the results showed that each subband could correctly fold out the pulse profile,and the wideband pulse profile accumulated by multiple subbands could be correctly aligned.

关键词： (stars)pulsars general-methods data analysis-techniques miscellaneous

Investigating the mechanisms of isochorismate synthase:An approach to improve salicylic acid synthesis and increase resistance to Fusarium head blight in wheat

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The Crop Journal 2024年第4期12卷 1054-1063页

作者： ya-zhou zhang Jie Man Dan Xu Lan Wen Yinghui Li Mei Deng Qian-Tao Jiang Qiang Xu Guo-Yue Chen Yu-Ming Wei State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural UniversityChengdu 611130SichuanChina Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130SichuanChina

Salicylic acid(SA),a vital endogenous hormone,plays a crucial role in plant growth and the response to abiotic and biotic *** synthase(ICS)and phenylalanine ammonia lyase(PAL)are critical rate-limiting enzymes for SA *** head blight(FHB)seriously threatens the safety of wheat production,but increasing the content of SA can enhance FHB ***,the pathway of SA synthesis and regulation in wheat remains *** this study,three wheat ICS(TaICSA,TaICSB,and TaICSD)were identified,and their functions were validated in vitro for isomerizing chorismate to *** mutation of one or two homoeoalleles of TaICSA,TaICSB,and TaICSD in the wheat variety‘Cadenza’reduced SA levels under ultraviolet treatment and Fusarium graminearum infection,further enhancing sensitivity to *** of TaICSA can significantly enhance SA levels and resistance to *** further study SA synthesis pathways in wheat and avoid interference with pathogenicity related genes,the leaves of wild-type Cadenza and different TaICS mutant lines were subjected to ultraviolet treatment for transcriptomic *** results showed that 37 PALs might be involved in endogenous SA synthesis,and 82 WRKY and MYB family transcription factors may regulate the expression of ICS and *** results were further confirmed by *** conclusion,this study expands our knowledge of SA biosynthesis and identifies TaICSA,as well as several additional candidate genes that encode transcription factors for regulating endogenous SA levels,as part of an efficient strategy for enhancing FHB resistance in wheat.

关键词： Salicylic acid Chorismate Isochorismate RNA-seq Phenylalamine ammonia lyase

Fabricating functionally graded Fe-Cr-Co permanent magnetic alloys via laser powder bed fusion

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Journal of Iron and Steel Research International 2024年第3期31卷 729-737页

作者： ya-zhou He ya-qing Hou Peng Shen Hao zhang Dong zhou Hang Su Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China Material Digital R&D Center China Iron and Steel Research Institute Group Co.Ltd.Beijing 100081China

Laser powder bed fusion(LPBF)in-situ alloying technology offers the possibility to construct gradient materials with varied structures and *** graded Fe-Cr-Co permanent magnetic alloys were fabricated by LPBF and in-situ alloying mixed powders of Fe,Cr,and Co *** effects of different Fe,Cr and Co contents on the microstructure,magnetic properties and hardness of Fe-Cr-Co alloys prepared by LPBF were *** as-built Fe-Cr-Co alloys present a single body-centered-cubic phase and have a homogeneous distribution of *** mechanical properties and magnetic properties of the compositionally graded sample show a gradient *** the increase in Cr content,the Vickers hardness of the sample increases,and the saturation magnetization of the sample *** optimal magnetic properties in an isotropic state are given as coercivity HcB=21.65 kA/m,remanence Br=0.70 T and energy product(BH)_(max)=5.35 kJ/m^(3),which are comparable to or higher than the reported magnetic properties in an isotropic state prepared by traditional powder *** in-situ alloying technology has the potential to further explore Fe-Cr-Co magnetic materials,such as those consisting of multiple or more constituent elements,and to maximize the compositional flexibility of magnetic materials.

关键词： Fe-Cr-Co alloy Laser powder bed fusion In-situ alloying Functional material Magnetic property

Simulation analysis of a method to improve data-transmission performance of Nanshan 26 m Radio Telescope based on Software-Defined Networks

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Research in Astronomy and Astrophysics 2021年第11期21卷 79-88页

作者： Jie Wang Hai-Long zhang Na Wang Xin-Chen Ye Wan-Qiong Wang Jia Li Meng zhang ya-zhou zhang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China National Astronomical Data Center Beijing 100101China

Data Center of Xinjiang Astronomical Observatory(XAO-DC)commenced operating in 2015,and provides services including archiving,releasing and retrieving precious astronomical data collected by the Nanshan 26 m Radio Telescope(NSRT)over the years,and realises the open sharing of astronomical observation *** observation data from NSRT are transmitted to XAO-DC 100 km away through dedicated fiber for long-term *** the continuous increase of data,the static architecture of the current network cannot meet NSRT data-transmission requirements due to limited network *** get high-speed data-transmission using the existing static network architecture,a method for reconstruction data-transmission network using Software-Defined Networks(SDN)is *** from the SDN’s data and control plane separation,and open programmable,combined with the Mininet simulation platform for experiments,the TCP throughput(of single thread)was improved by~24.7%,the TCP throughput(of multi threads)was improved by~9.8%,~40.9%,~35.5%and~11.7%.Compared with the current network architecture,the Latency was reduced by~63.2%.

关键词： data transmission observation data data center virtual machine

Oreocharis xieyongii,an unusual new species of Gesneriaceae from western Hunan,China

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Plant Diversity 2022年第2期44卷 222-230页

作者： Zhen-Yu Lv Ziyoviddin Yusupov Dai-Gui zhang ya-zhou zhang Xiao-Shuang zhang Nan Lin Komiljon Tojibaev Hang Sun Tao Deng CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650204YunnanChina University of Chinese Academy of Sciences Beijing 100049China Institute of Botany Academy of Sciences of UzbekistanTashkent 100053Uzbekistan Key Laboratory of Plant Resources Conservation and Utilization Jishou UniversityJishou 416000HunanChina School of Life Sciences Yunnan Normal UniversityKunming 650500YunnanChina

A new species,Oreocharis xieyongii ***,***&***,from Hunan Province,central China,is *** combination of purple zygomorphic corolla with longer adaxial lobes and exserted stamens defines the species and discriminates it from all other current Oreocharis *** traits of the new species were compared to those of two similar species,Oreocharis xiangguiensis and *** analysis indicates that the new species is nested within the *** only half of Oreocharis species were included in our study,evolutionary character analysis indicates that the ancestral states of the genus are likely the purple corolla,longer abaxial lip and inserted *** longer adaxial lip is perhaps an apomorphy and only present in *** and *** morphological and molecular evidence suggest that *** is a taxon new to science.

关键词： China Gesneriaceae Morphology Phylogeny Taxonomy

Diversity patterns of cushion plants on the Qinghai-Tibet Plateau:A basic study for future conservation efforts on alpine ecosystems

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Plant Diversity 2022年第3期44卷 231-242页

作者： ya-zhou zhang Li-Shen Qian Xu-Fang Chen Lu Sun Hang Sun Jian-Guo Chen Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnanChina University of Chinese Academy of Sciences BeijingChina School of Life Sciences Yunnan UniversityKunmingYunnanChina

The Qinghai-Tibet Plateau(QTP)is an important cushion plant ***,the distribution of cushion plants on the QTP is unknown,as are the factors that drive cushion plant distribution,limiting our understanding of the evolution of cushion species in the *** this study,we assessed spatial patterns of total cushion plant diversity(including taxonomic and phylogenetic)over the entire QTP and compared patterns of diversity of cushion plants with different typologies(i.e.,compact ***).We also examined how these patterns were related to climatic *** results indicate that the southern QTP hosts the highest total cushion plant richness,especially in the south-central Hengduan Mountains *** total number of cushion species declines from south to north and from southeast to *** cushion plants exhibit similar patterns as the total cushion plant richness,whereas loose cushion plants show random *** plant phylogenetic diversity showed a similar pattern as that of the total cushion plant *** addition,cushion plant phylogenetic community structure was clustered in the eastern and southwestern QTP,whereas random or overdispersed in other *** features represented by annual energy and water trends,seasonality and extreme environmental factors,had significant effects on cushion plant diversity patterns but limited effects on the phylogenetic community structure,suggesting that climatic features indeed promote the formation of cushion *** cushion plants play vital roles in alpine ecosystems,our findings not only promote our understanding of the evolution and formation of alpine cushion plant diversity but also provide an indispensable foundation for future studies on cushion plant functions and thus alpine ecosystem sustainability in the entire QTP region.

关键词： Climatic features Cushion distribution Ecosystem engineer Hengduan mountains Phylogenetic diversity Phylogenetic community structure

Investigating the mechanisms of isochorismate synthase: an approach to improve salicylic acid synthesis and increase resistance to Fusarium head blight in wheat

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