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

Unravelling the genetic basis for skeletal muscle mitochondrial DNA copy number variations in pigs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第1期67卷 211-214页

作者： Jiawen Yang Leilei Cui Yifeng zhang Ziqi Ling zhou zhang Yizhong Huang Junwu Ma Shijun Xiao Bin Yang Lusheng Huang National Key Laboratory for Swine Genetic Improvement and Germplasm Innovation Jiangxi Agricultural UniversityNanchang 330045China School of Life Sciences Nanchang UniversityNanchang 330047China

Dear Editor,Mitochondria are the center of cellular energy generation and free radical metabolism,with important functions in regulating intracellular calcium levels,cell apoptosis,cell cycle and epigenetic *** DNA copy number(mtDNA-CN)is an indicator of mitochondrial biogenesis and has been associated with several diseases,such as cardiovascular disease,depression,chronic kidney disease and aging in humans(Clyde,2022).

关键词： metabolism cardiovascular diseases

银催化环丙烯酮与醇的C—C键断裂加成反应（英文）

在线全文

学校读者我要写书评

暂无评论

有机化学 2024年第7期44卷 2233-2240页

作者：张书林张周孙萌西北大学化学与材料科学学院合成与天然功能分子教育部重点实验室

发展了一种银催化的环丙烯酮与醇的C—C键活化反应合成α-苯基肉桂酸酯的高效方法.该反应条件温和,区域选择性专一,底物官能团兼容性好,产物收率高,对于天然产物的后期修饰具有重要意义.

关键词：银催化碳碳键活化环丙烯酮亲核加成

同方期刊数据库

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

在线全文

学校读者我要写书评

暂无评论

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

Renin-angiotensin system inhibitors prescriptions in Chinese hospitalized chronic kidney disease patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第17期12卷 3061-3075页

作者： Chun zhang Zhi-Yu Duan Sa-Sa Nie zhou zhang Xin-Ru Guo Chao-Yang zhang Jing Dong Guang-Yan Cai Department of Nephrology The First Medical CentreChinese PLA General HospitalBeijing 100853China School of Medicine Nankai UniversityTianjin 300071China National Engineering Laboratory for Medical Big Data Application Technology Chinese PLA General HospitalBeijing 100853China

BACKGROUND Many guidelines have recommended renin-angiotensin system inhibitors(RASI)as the first-line treatment for patients with chronic kidney disease(CKD).We studied RASI prescription trends from 2010 to 2019,and analyzed the characteristics associated with RASI prescription in Chinese hospitalized CKD *** To study the prescription of renin angiotensin system inhibitors in hospitalized patients with CKD in *** It was retrospectively,cross-sectional reviewed RASI prescriptions in hospitalized CKD patients in China from 2010 to *** prescribing trends were analyzed from 2010 to 2019,and bivariate and multivariate logistic regression analyses were conducted to identify characteristics associated with RASI *** A total of 35090 CKD patients were included,with 10043(28.6%)RASI *** these patients,18919(53.9%)met the criteria for RASI treatments based on the 2012 kidney disease:Improving global outcomes *** these,7246(38.3%)patients received RASI *** prescriptions showed an initial rapid increase from 2011 to 2012,reached its peak around 2015 and 2016,and then exhibited a subsequent slight decreasing *** bivariate and multivariate analyses showed that several characteristics,including the male gender,age less than 60-year-old,nephrology department admission,lower CKD stage,history of hypertension or diabetes,proteinuria,glomerulonephritis as the CKD etiology,and non-acute kidney injury were associated with RASI *** The frequency of RASI prescriptions showed an initial increase but a slight decreasing trend in more recent *** patients with certain characteristics such as elderly age,advanced disease stage,surgery department admission,or acute kidney injury were less likely to receive RASI *** the application of RASI in hospitalized CKD patients is *** actual clinical practice needs to be *** development of related research

关键词： Chronic kidney disease Renin-angiotensin system inhibitors Prescriptions Adherence

基于机器学习和logistic回归分析模型分析2型糖尿病轻度认知功能障碍的影响因素

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

中华疾病控制杂志 2024年第3期28卷 269-276页

作者：张红梅张宁孙玉娇张洲南京大学医学院附属鼓楼医院内分泌科南京210008

目的应用机器学习和logistic回归分析模型分析2型糖尿病(type 2 diabetes mellitus, T2DM)轻度认知功能障碍的影响因素,为相关干预措施提供依据。方法收集南京鼓楼医院内分泌科1 284例T2DM患者的资料,将数据分为训练集(70%)和测试集(3... 详细信息

目的应用机器学习和logistic回归分析模型分析2型糖尿病(type 2 diabetes mellitus, T2DM)轻度认知功能障碍的影响因素,为相关干预措施提供依据。方法收集南京鼓楼医院内分泌科1 284例T2DM患者的资料,将数据分为训练集(70%)和测试集(30%),分别采用logistic回归分析、随机森林、XGBoost模型对数据建模并进行可解释性分析。结果随机森林模型的预测性能最高,训练集的AUC值为1.0,测试集的AUC值为0.783(95%CI:0.660~0.894),模型筛选出T2DM患者发生轻度认知功能障碍的19个重要变量,如受教育时间、年龄、胰岛素敏感指数、周围神经病变、糖化血红蛋白、骨代谢异常等。结论随机森林模型的预测性能最佳,可以协助医务人员准确识别T2DM患者发生轻度认知功能障碍的危险因素,有助于医务人员对患者进行早期预防。

关键词：轻度认知功能障碍影响因素 2型糖尿病机器学习

Efficacy comparison of multipoint and single point scanning panretinal laser photocoagulation in non-proliferative diabetic retinopathy treatment

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第8期15卷 1734-1741页

作者： Yang-zhou zhang Hua Gong Juan Yang Ji-Pu Bu Hui-Ling Yang Institute of Molecular Precision Medicine and Hunan Key Laboratory of Molecular Precision Medicine Xiangya HospitalCentral South UniversityChangsha 410008Hunan ProvinceChina Department of Ophthalmology Xingsheng HospitalYiyang 413200Hunan ProvinceChina Department of Ophthalmology Boshi Eye HospitalLiuyang 410300Hunan ProvinceChina Department of Ophthalmology Hunan Children‘s HospitalChangsha 410007Hunan ProvinceChina

BACKGROUND Non-proliferative diabetic retinopathy(NPDR)poses a significant challenge in diabetes management due to its microvascular changes in the *** photocoagulation,a conventional therapy,aims to mitigate the risk of progressing to proliferative diabetic retinopathy(PDR).AIM To compare the efficacy and safety of multi-spot vs single-spot scanning panretinal laser photocoagulation in NPDR *** Forty-nine NPDR patients(86 eyes)treated between September 2020 and July 2022 were *** were randomly allocated into single-spot(n=23,40 eyes)and multi-spot(n=26,46 eyes)*** outcomes,including bestcorrected visual acuity(BCVA),central macular thickness(CMT),and mean threshold sensitivity,were assessed at predetermined intervals over 12 *** reactions were also *** Energy levels did not significantly differ between groups(P>0.05),but the multi-spot group exhibited lower energy density(P0.05).CONCLUSION While energy intensity and safety were comparable between modalities,multi-spot scanning demonstrated lower energy density and showed superior short-term improvements in BCVA and CMT for NPDR patients,with reduced laser-induced damage.

关键词： Panretinal laser photocoagulation Non-proliferative diabetic retinopathy Efficacy comparison Multipoint Single point Treatment assessment