检索结果-南通市图书馆

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun wen-Biao Han yi-Yang guo He Wang Minghui Du Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

Reposition of coronary sinus lead dislocation only using pre-shaped stylet and guidewire： a case report

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 Medical Journal 2011年第6期124卷 954-955页

作者： yi Fu SHEN Min WU Feng WANG Hai-chang guo wen-yi LI Wei-jie LIU Bing Department of Cardiovascular Medicine Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China

Technologies associated with cardiac resynchronization therapy （CRT） devices and lead systems have ***, dislocation after coronary sinus （CS） lead placement continues to be a problem. We reported on the patient treated with CRT, in whom dislocation of CS lead occurred. In the case, we tried to reposition the CS lead without the left heart delivery system only using pre-shaped stylet and guidewire, and the dislocated CS lead could be successfully repositioned by the method. The method of only using a pre-shaped stylet and guidewire is easier than the conventional way, and it can shorten procedure duration and fluoroscopy time, as well as reduce the cost of treatment, but it is not always feasible.

关键词： cardiac resynchronization therapy coronary sinus lead dislocation reposition

Glaucoma in Patients with Eyes Close to Areas Affected by Port-wine Stain has Lateral and Gender Predilection

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2017年第24期130卷 2922-2926页

作者： Yue Wu Ru-Jing Yu Di Chen Li Xu Mao Li Li Zhu Chun-Yu guo wen-yi guo Department of Ophthalmology Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200011 China

Background：The location of facial port-wine stain （PWS） may be helpful for predicting some associated anomalies;high glaucoma incidence is found in patients with eyes close to PWS-affected areas （V1,ophthalmic branch area of the trigeminal nerve）.This study aimed to investigate the characteristics of glaucoma in V1-affected ***：A total of 569 patients with V1 area-affected PWS were reviewed in the *** large series was based on the referral system between the Department of Plastic and Reconstructive Surgery and the Department of *** patients were screened for glaucoma with assessments of intraocular pressure,cup-to-disc ratio,comeal diameter （only for infants）,and axial ***：Of the 569 patients,110 （19.3%） patients had *** the patients,18.1% （76/420） had early-onset glaucoma （under 4-year-old group）.In the 4 to 18-year-old age group,29.3% （29/99） of the patients had *** with right lateral and bilateral PWS,left-sided PWS had a lower risk of glaucoma in this study （odds ratio =0.432 [95% confidence interval,0.264-0.706],P =0.01）.The under 4-year-old group showed a slight predominance of males （61.8%） in ***：High glaucoma incidence was observed in patients with eyes close to *** attention should be paid to glaucoma screening for right lateral and bilateral PWS *** predominance of males in Sturge-Weber syndrome （SWS） early-onset glaucoma patients might be due to the limitation of the case number;however,it might also provide us a new clue of potential relationship between SWS and PCG.

关键词： Birthmark Glaucoma Port-wine Stain Sturge-Weber Syndrome

时代变局中的家国书写与词风进境——以《庚子秋词》《春蛰吟》为中心

在线全文

学校读者我要写书评

暂无评论

中山大学学报（社会科学版） 2020年第6期60卷 32-41页

作者：郭文仪中国人民大学国学院北京100872

《庚子秋词》与《春蛰吟》为庚子之变时名家吟咏的代表作,反映了国破家亡之时晚清士人的凄凉心曲,堪称词史。庚子唱和表现出对北宋小令与南宋长调的取径和超越,增强了词体的隐喻功能与叙事容量,更有利于寄托世变下的讽喻与心境。而词作... 详细信息

《庚子秋词》与《春蛰吟》为庚子之变时名家吟咏的代表作,反映了国破家亡之时晚清士人的凄凉心曲,堪称词史。庚子唱和表现出对北宋小令与南宋长调的取径和超越,增强了词体的隐喻功能与叙事容量,更有利于寄托世变下的讽喻与心境。而词作的书写策略与风格,体现出词这一传统文体在世变影响下的应对与转变,并影响了此后词风的演进。

关键词：《庚子秋词》《春蛰吟》家国书写词风进境

Akt-centered amplification loop plays a critical role in vascular endothelial growth factor/stromal cell-derived factor 1-αcross-talk and cardioprotection

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第22期124卷 3800-3805页

作者： guo wen-yi ZHANG Dian-xin LI Wei-jie ZHAO Zhi-jing LIU Bing WANG Hai-chang LI Fei Department of Cardiology Xijing Hospital Fourth Military Medical University Xi＇an Shaanxi 710032 China

Background Vascular endothelial growth factor （VEGF） is one of major mediators of angiogenesis and survival factor in some tissue, however, its direct effects on cardiomyocytes remain poorly understood. Methods Rat neonatal ventricular myocytes were cultured in vitro. Akt phosphorylation was measured by Western blotting; the expression of stromal cell-derived factor α（SDF-1α）/CXCR4 axis was evaluated by real-time PCR and Western blotting. LY294002 and AMD3100 were used to interfere with the signaling of VEGF and SDF-1α/CXCR4 axis. Cardiac myocytes viability and injury were evaluated by trypan blue staining and lactate dehydrogenase （LDH） release. Results Treatment of neonatal rat ventricular myocytes with VEGF induced phosphorylation of Akt in a dose and FIk-1 dependent manner. VEGF attenuated H202 induced cardiac myocyte death. The phosphoinositol-3-kinase （PI3K） inhibitor, LY294002 and FIk-1 antibody abolished the beneficial effects of VEGF on H202 induced cell death. In the mean time SDF-1α-CXCR4 axis was up-regulated by VEGF through PI3K-Akt signaling and contributed to the protective effects of VEGF on H202 induced cell death. Interestingly, SDF-1α also promoted production of VEGF in cultured cardiac myocytes and LY294002 reversed the up-reguLation of VEGF induced by SDF-1α. Conclusion VEGF has direct protective effects on cardiomyocytes; a crosstalk between VEGF and SDF-1α through PI3K-Akt serves a survival role in cardiomvocvtes in vitro.

关键词： vascular endothelial growth factor cardiomyocyte, stromal cell-derived factor a survival PI3K-Akt

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

青光眼患者生活质量的研究进展

中华眼科杂志 2009年第1期45卷 88-92页

作者：席淑新郭文毅复旦大学附属眼耳鼻喉科医院眼科上海200031

青光眼以其不可逆转的视神经损害、视野缺损及视力丧失为特征。其疾病本身和各种治疗都会明显限制青光眼患者的日常生活和社会活动，从而严重影响患者的生活质量。为此，有必要就目前有关青光眼患者的生活质量及其影响因素的研究资料予... 详细信息

青光眼以其不可逆转的视神经损害、视野缺损及视力丧失为特征。其疾病本身和各种治疗都会明显限制青光眼患者的日常生活和社会活动，从而严重影响患者的生活质量。为此，有必要就目前有关青光眼患者的生活质量及其影响因素的研究资料予以综述，以供同道参考。

关键词：青光眼生活质量视神经损害影响因素

Nitric oxide induces heat shock protein 72 production and delayed protection against myocardial ischemia in rabbits via activating protein kinase C

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2008年第12期121卷 1109-1113页

作者： LI Wei-jie ZHAO Zhi-jing LIU Bing ZHANG Dian-xin LI Fei WANG Hai-chang guo wen-yi JIA guo-liang Masafumi Kitakaze Masatsugu Hori Department of Cardiology Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710033 China First Department of Medicine Osaka University School of Medicine Suita 565 Japan

Background Nitric oxide （NO） is a biologically active molecule which has been reported to protect the heart against ischemia and reperfusion injury in different species. This study aimed to test the hypothesis that nitric oxide may induce the expression of heat shock protein 72 （HSP72） which may protect the heart against ischemia.Methods Rabbits were given intravenous saline or S-nitroso-N-acetylpenicillamine （SNAP）, a nitric oxide donor, or Zaprinast, an inhibitor of cyclic guanosine monophosphate （GMP）-phosphodiesterase, which may increase myocardial cyclic GMP content. Twenty-four hours later, the rabbits were either sampled to measure HSP72, or induced with a 30-minute coronary occlusion followed by a 120-minute reperfusion, and then the infarct size was measured. Meanwhile, chelerythrine （CHE, an inhibitor of protein kinase C） was given intravenously 5 minutes before SNAP injection and the effect on HSP72 expression and infarct size was determined.Results Twenty-four hours after pretreatment, immunoblotting showed HSP72 expression increased in the SNAP group compared with control groups, and this was blocked by CHE. Myocardial infarct size in the SNAP group was smaller than that of the control group （（32.4±5.8）% vs （51.1±4.7）%, P 〈0.05）. Pretreated with CHE abolished the infarct size-limiting effect of SNAP （（46.0±5.1）%）. Pretreatment with Zaprinast neither induced HSP72 expression nor reduced infarct size （（55.4±5.4）%）.Conclusion NO induced HSP72 expression and a delayed protection to the heart via the activities of protein kinase C by a cyclic GMP-independent pathway.

关键词： nitric oxide heat shock protein 72 protein kinase C myocardial infarction

在线全文

学校读者我要写书评

暂无评论

几何体网对随机模拟的影响

数理统计与管理 2014年第5期33卷 821-829页

作者：汪文俊郭文怡海南师范大学数学与统计学院海南海口510000 云南大学数学与统计学院云南昆明650000 香港大学统计学与精算学系北京师范大学-香港浸会大学联合国际学院理工科技学部广东珠海519085

随着计算机的迅速发展,统计模拟常用于解决实际问题.在几何概率问题中,代表几何体网的构造十分重要。本文考虑四种不同的产生网的方法对三种不同几何体(球带、圆饼、圆环)进行模拟试验,得到一些有用的结果,并推荐数论方法,特别是好格子... 详细信息

随着计算机的迅速发展,统计模拟常用于解决实际问题.在几何概率问题中,代表几何体网的构造十分重要。本文考虑四种不同的产生网的方法对三种不同几何体(球带、圆饼、圆环)进行模拟试验,得到一些有用的结果,并推荐数论方法,特别是好格子点(GLP)方法。本文指出代表几何体的网十分重要,若选择不当,可能会导致有偏估计。

关键词：统计模拟数论方法好格子点法几何概率均匀设计

相干光断层扫描在青光眼诊断和随访中的应用进展

在线全文

学校读者我要写书评

暂无评论

中华眼科杂志 2012年第12期48卷 1146-1149页

作者：龙青清郭文毅复旦大学附属眼耳鼻喉科医院眼科上海200031

青光眼是目前全世界最重要的不可逆致盲性眼病之一，其早期诊断和治疗是决定预后的关键。相干光断层扫描（OCT）具有非接触性、高分辨率、可重复性好、获取眼部图像快等优点，已在眼科领域广泛应用。近年来OCT检测技术也逐步应用于青光... 详细信息

青光眼是目前全世界最重要的不可逆致盲性眼病之一，其早期诊断和治疗是决定预后的关键。相干光断层扫描（OCT）具有非接触性、高分辨率、可重复性好、获取眼部图像快等优点，已在眼科领域广泛应用。近年来OCT检测技术也逐步应用于青光眼的诊断和随访观察方面，如检测青光眼患者的视网膜神经纤维层厚度、视乳头形态、视网膜神经节细胞参数、前房和前房角参数、虹膜和脉络膜厚度、晶状体改变及评价术后滤过泡形态等。因此，有必要就国内外OCT检测技术在青光眼诊断和随访中的应用进展予以综述，以供同道参考。

关键词：体层摄影术光学相干青光眼随访研究