检索结果-南通市图书馆

PSRDP:A Parallel Processing Method for Pulsar Baseband Data

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第7期24卷 148-160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 Sciences University of Chinese Academy of Sciences Key Laboratory of Radio Astronomy Chinese Academy of Sciences National Astronomical Data Center Southeast University

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 technology. UWLPIPE runs on the GPU cluster and can simultaneously receive multiple 128 MHz dual-polarization VDIF data packets preprocessed by the front-end FPGA. After 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 alignment. We used the Nanshan 26 m radio telescope with the L-band receiver at964 ～ 1732 MHz to observe multiple pulsars. Finally, 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

Security analysis of satellite-to-ground reference-frame-independent quantum key distribution with beam wandering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第8期33卷 192-201页

作者：周淳赵燕美杨晓亮陆宜飞周雨姜晓磊汪海涛汪洋李家骥江木生汪翔张海龙李宏伟鲍皖苏 Henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhou 450001China Synergetic Innovation Centre of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

The reference-frame-independent(RFI)quantum key distribution(QKD)is suitable for satellite-based links by removing the active alignment on the reference ***,how the beam wandering influences the performance of RFI-QKD remains a pending issue in satellite-to-ground *** this paper,based on the mathematical model for characterizing beam wandering,we present the security analysis for satellite-to-ground RFI-QKD and analytically derive formulas for calculating the secret key rate with beam *** simulation results show that the performance of RFI-QKD is better than the Bennett–Brassard 1984(BB84)QKD with beam wandering in asymptotic ***,the degree of influences of beam wandering is specifically presented for satellite-to-ground RFI-QKD when statistical fluctuations are taken into *** work can provide theoretical support for the realization of RFI-QKD using satellite-to-ground links and have implications for the construction of large-scale satellite-based quantum networks.

关键词： quantum key distribution satellite-to-ground beam wandering

Efficacy and safety of Kangxian Huanji Granule as adjunctive treatment in acute exacerbation of idiopathic pulmonary fibrosis:An exploratory randomized controlled trial

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2023年第6期21卷 543-549页

作者： Jian-sheng Li hai-long zhang Wen Guo Lu Wang Dong zhang Li-min Zhao Miao Zhou Co-construction Collaborative Innovation Center for Chinese Medicine and Respiratory Diseases by Henan&Education Ministry of China Henan Key Laboratory of Chinese Medicine for Respiratory DiseasesHenan University of Chinese MedicineZhengzhou 450046Henan ProvinceChina Respiratory Department the First Affiliated Hospital of Henan University of Chinese MedicineZhengzhou 450000Henan ProvinceChina Department of Respiratory and Critical Care Medicine Henan Provincial People’s HospitalZhengzhou 463599Henan ProvinceChina Respiratory Department the Third Affiliated Hospital of Henan University of Chinese MedicineZhengzhou 450003Henan ProvinceChina

Background:Acute exacerbation of idiopathic pulmonary fibrosis(AE-IPF)is an important occurrence in the natural history of idiopathic pulmonary fibrosis(IPF),associated with high hospitalization rates,high mortality and poor *** present,there is no effective treatment for *** herbal medicine has some advantages in treating IPF,but its utility in AE-IPF is ***:The treatment of AE-IPF with Kangxian Huanji Granule(KXHJ),a compound Chinese herbal medicine,lacks an evidence-based *** study explores the efficacy and safety of KXHJ in patients with ***,setting,participants and interventions:Wedesigned a randomized,double-blind,placebo-controlled,exploratory clinical trial.A total of 80 participants diagnosed with AE-IPF were randomly assigned to receive KXHJ or a matching placebo;the treatment included a 10 g dose,administered twice daily for 4 weeks,in addition to conventional *** were followed up for 12 weeks after the *** outcome measures:The primary endpoints were treatment failure rate and all-cause *** endpoints included the length of hospitalization,overall survival,acute exacerbation rate,intubation rate,the modified British Medical Research Council(mMRC)score,and the St George’s Respiratory Questionnaire for IPF(SGRQ-I)***:The rate of treatment failure at 4 weeks was lower in the intervention groupcompared to the control group(risk ratio[RR]:0.22;95%confidence interval[CI]:0.051 to 0.965,P=0.023).There was no significant difference in all-causemortality at 16 weeks(RR:0.75;95%CI:0.179 to 3.138;P>0.999)or in the acute exacerbation rate during the 12-week follow-up period(RR:0.69;95%CI:0.334 to 1.434;P=0.317).The intervention group had a shorter length of hospitalization than the control group(mean difference[MD]:–3.30 days;95%CI,–6.300 to–0.300;P=0.032).Significant differences in the mean change from baseline in the mMRC(between-group difference:–0.67;

关键词： Idiopathic pulmonary fibrosis Acute exacerbation Chinese herbal medicine Integrative medicine Randomized controlled trial

Targeting GATA1 and p2x7r Locus Binding in Spinal Astrocytes Suppresses Chronic Visceral Pain by Promoting DNA Demethylation

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2022年第4期38卷 359-372页

作者： Yan-Yan Wu hai-long zhang Xiaomin Lu Han Du Yong-Chang Li Ping-An zhang Guang-Yin Xu Jiangsu Key Laboratory of Neuropsychiatric Diseases Institute of NeuroscienceSoochow UniversitySuzhou 215123China Department of Oncology The Affiliated Haian Hospital of Nantong UniversityNantong 226600China Center for Translational Medicine The Affiliated Zhangjiagang Hospital of Soochow UniversitySuzhou 215600China

Irritable bowel syndrome is a gastrointestinal disorder of unknown etiology characterized by widespread,chronic abdominal pain associated with altered bowel *** amounts of evidence indicate that injury and inflammation during the neonatal period have long-term effects on tissue structure and function in the adult that may predispose to gastrointestinal *** this study we aimed to investigate how the epigenetic regulation of DNA demethylation of the p2x7r locus guided by the transcription factor GATA binding protein 1(GATA1)in spinal astrocytes affects chronic visceral pain in adult rats with neonatal colonic inflammation(NCI).The spinal GATA1 targeting to DNA demethylation of p2x7r locus in these rats was assessed by assessing GATA1 function with luciferase assay,chromatin immunoprecipitation,patch clamp,and interference in vitro and in *** addition,a decoy oligodeoxynucleotide was designed and applied to determine the influence of GATA1 on the DNA methylation of a p2x7r CpG *** showed that NCI caused the induction of GATA1,Ten-eleven translocation 3(TET3),and purinergic receptors(P2X7Rs)in astrocytes of the spinal dorsal horn,and demonstrated that inhibiting these molecules markedly increased the pain threshold,inhibited the activation of astrocytes,and decreased the spinal sEPSC *** also markedly demethylated the p2x7r locus in a manner dependent on the enhancement of both a GATA1–TET3 physical interaction and GATA1 binding at the p2x7r ***,we showed that demethylation of the p2x7r locus(and the attendant increase in P2X7R expression)was reversed upon knockdown of GATA1 or TET3 expression,and demonstrated that a decoy oligodeoxynucleotide that selectively blocked the GATA1 binding site increased the methylation of a CpG island in the p2x7r *** results demonstrate that chronic visceral pain is mediated synergistically by GATA1 and TET3 via a DNA-demethylation mechanism that controls p2x7r trans

关键词： Chronic visceral pain GATA binding protein 1 Ten-eleven translocation 3 Purinergic receptor Epigenetic regulation Spinal astrocytes

Microstructure and mechanical properties of a low activation cast WTaHfTiZr refractory high-entropy alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2022年第6期19卷 489-494页

作者： Xian-neng Ma Yi-fei Hu Kai Wang hai-long zhang Zi-tian Fan Jin-ping Suo Xin-wang Liu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Dekai Intelligent Casting Co. Ltd.Zhuozhou 072750HebeiChina China Iron and Steel Research Institute Group Beijing 100081China AECC South Industry Company Limited Zhuzhou 412002HunanChina

In the face of the requirement that nuclear fusion reactor materials exhibit more excellent thermal,mechanical and physical properties,a novel refractory highentropy alloy,WTaHfTiZr was *** constituent elements were selected in consideration of low activation,high melting point and high *** alloys were prepared by arc *** as-cast alloy shows a dendrite microstructure with two disordered BCC phases,which caused by the preferential nucleation of W and Ta with much higher melting points during *** exhibits a high compressive yield strength of 1,900 MPa and fracture strain of 8.1% at room temperature,and its yield strengths are up to 612 MPa at 700 ℃ and 203 MPa at 1,000 ℃,*** high strengths are attributed mainly to solid solution strengthening and second phase *** alloy shows great promise as one of the next-generation nuclear fusion reactor materials.

关键词： refractory high-entropy alloy phase structure microstructure mechanical properties

Alloy strategy to synthesize Pt-early transition metal oxide interfacial catalysts

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3390-3397页

作者： Shi-long Xu Hang Nan Wanqun zhang Yue Lin Sheng-Qi Chu hai-Wei Liang Hefei National Research Center for Physical Sciences at the Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei 230601China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Metal oxide supported metal catalysts show promising catalytic performance in many industry-relevant ***,the enhancement of performance is often limited by the insufficient metal/metal oxide *** this work,we demonstrate a general synthesis of Pt-early transition metal oxide(Pt-MO_(x),M=Ti,Zr,V,and Y)catalysts with rich interfacial sites,which is based on the air-induced surface segregation and oxidation of M in the supported Pt-M alloy *** characterizations verify the dynamic structural response of Pt-M alloy catalysts to air and the formation of Pt-MO_(x) catalysts with abundant interfacial *** prepared Pt-TiO_(x) interfacial catalysts exhibit improved performance in hydrogenation reactions of benzaldehyde,nitrobenzene,styrene,and furfural,as a result of the heterolytic dissociation of H_(2) at Pt-metal oxide interfacial sites.

关键词： Pt-early transition metal oxide interfacial catalyst alloy oxidation strategy interfacial sites hydrogenation reactions heterolytic dissociation

Dual template-induced construction of three-dimensional porous SiO2/NC/Co-CNTs heterostructure with highly dispersed active sites for efficient oxygen evolution reaction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2024年第3期6卷 585-595页

作者： hai-Qi zhang Xiao-Jun Zeng Qing-Qing zhang Zu-Liang zhang Chu-long Jin Rong-hai Yu School of Materials Science and Engineering Jingdezhen Ceramic University School of Materials Science and Engineering Beihang University

The development and exploration of efficient and economical electrocatalysts for oxygen evolution reaction（OER） represents the main bottleneck to unlocking a sustainable energy scenario based on elec trocataly tic water *** scale integration of three-dimensional（3D） porous heterostructure with highly dispersed active sites and good structural stability is ***,a dual template route is developed to construct the 3D porous SiO2/nitrogen-doped carbon（NC）/Co-carbon nano tubes（CNTs） hetero ***,the hard template（SiO2nano spheres） contributes to 3D porous structure,increases the specific surface area,and promotes the contact area of the *** the same time,the soft template（basic zinc carbonate） can control the growth of 1D CNTs and facilitate the exposure of the active ***,3D porous SiO2/NC/Co-CNTs hetero structure inherits highly dispersed Co nanoparticles coated by *** conductive channels and abundant N hetero atoms doping are reasonably constructed by a dual template ***,SiO2/NC/Co-CNTs catalyst provides an extraordinary activity for the OER in alkaline media,with a low overpotential of 298 mV at a current density of 10 mA·***,SiO2/NC/Co-CNTs hetero structure enables excellent long-term durability with a 10 mV decay in overpotential after 3000 cyclic voltammetry cycles,and 97% remain in current density over 20 *** is believed that this dual template strategy can provide a new and simple way to construct a highly dispersed active site in electrocatalysts.

关键词： Dual template High dispersion Porous heterostructure Conductive channels Oxygen evolution reaction