检索结果-南通市图书馆

An active M star with X-ray double flares disguised as an ultra-luminous X-ray source

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第2期16卷 119-126页

作者： jin-cheng guo Ji-Feng Liu Song Wang Yue Wu Yu-Xiang Qin Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China University of Chinese Academy of Sciences Beijing 100049China School of Physics The University of MelbourneParkvilleVictoria 3010Australia

Here we present research on an ultra-luminous X-ray source （ULX） candidate 2XMM J 140229.91＋542118.8. The X-ray light curves of this ULX candidate in M 101 exhibit features of a flare star. More importantly, the Chandra light curve displays unusual X-ray double flares, which is comprised of two close peaks. The X-ray （0.3-11.0 keV） flux of the first peak was derived from the two-temperature APEC model as ～ 1.1 ±0.1× 10-12 ergcm-2 s-1. The observed flux at its first peak increased by about two orders of magnitude in X-ray as compared to quiescence. The slope of the second fast decay phase is steeper than the slope of the first fast decay phase, indicating that the appearance of a second flare accelerated the cooling of the first flare in a way we do not understand yet. We also observed its optical counterpart using a 2.16 m telescope administered by National Astronomical Observatories, Chinese Academy of Sciences. By optical spectral fitting, it is confirmed to be a late type dMe2.5 star. According to the spectral type and apparent magnitude of its optical counterpart, we estimate the photometric distance to be ～ 133.4 ±14.2 pc. According to the X-ray spectral fitting, a possible explanation is provided. However, more similar close double flares are needed to confirm whether this accelerated cooling event is a unique coincidence or a common physical process during double flaring.

关键词： stars flare -- X-ray stars -- galaxies individual (M101)

Application of a New Measuring Method to Large Size Measurement in an Automobile Panel

在线全文

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2009年第2期14卷 78-83页

作者： ZHANG De-hai LIANG jin guo cheng School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 China

In view of the automobile panel＇s features of complex shapes, the higher requirements of appearance surface quality, and the more accurate mechanical model for CAE simulation etc, a kind of measurement method for large size measurement was presented. The method was composed of digital close-range industrial photogrammetry technology and computer binocular vision technology, it could measure workpieces quickly and precisely. First, XJ- TUDP software, which was a kind of photogrammetry software, figured out un-coded points and coded-points which fixed on the surface of a large part and took a solid base for the fusion of many pieces point clouds. Second, based on XJTUOM, which was a kind of 3D dense point cloud optical measure software, imported global landmarks points came from XJTUDP into XJTUOM, and point clouds can be assembled automatically. 3D data of the object surface may be acquired precisely by means of this method. Finally, an automobile door was taken for example and the experimental data was combined so we can see that the developed system possesses better accuracy and it can ad- dress the feature of a large workpiece.

关键词： photogrammetry automobile panel XJTUDP software XJTUOM software

Evaluation of metoprolol standard dosing pathway in Chinese patients with acute coronary syndrome:a prospective multicenter single-arm interventional study

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2023年第4期20卷 256-267页

作者： Xiao-Yun YIN Yun-Mei ZHANG Ai-Dong SHEN jing-Ping WANG Zhe-Xun LIAN Yi-Bing SHAO Wen-Qi ZHANG Shu-Ying ZHANG Yang ZHENG Kang cheng Biao XU cheng-Xing SHEN Rong-Chong HUANG jin-cheng guo guo-Sheng FU Dong-Kai SHAN Dan-Dan LI Yun-Dai CHEN Senior Department of Cardiology the Sixth Medical CentreChinese PLA General HospitalBeijingChina Medical School of Chinese PLA BeijingChina Department of Cardiology Yunnan First People’s HospitalKunmingChina Department of Heart Center Beijing Friendship HospitalCapital Medical UniversityBeijingChina Department of Cardiology Shanxi Cardiovascular HospitalTaiyuanChina Department of Cardiology the Affiliated Hospital of Qingdao UniversityQingdaoChina Department of Cardiology Qingdao Municipal HospitalQingdaoChina Department of Cardiology China-Japan Union Hospital of Jilin UniversityChangchunChina Department of Cardiology the Affiliated Zhongshan Hospital of Dalian UniversityZhongshanChina Cardiovascular Center the First Hospital of Jilin UniversityChangchunChina Department of Cardiology the Affiliated Hospital of Northwest University&Xi’an No.3 HospitalXi’anChina Department of Cardiology Nanjing Drum Tower HospitalNanjing University Medical SchoolNanjingChina Department of Cardiology Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghaiChina Department of Cardiology Beijing Friendship HospitalCapital Medical UniversityBeijingChina Department of Cardiology Beijing Luhe HospitalCapital Medical UniversityBeijingChina Department of Cardiology School of MedicineSir Run Run Shaw HospitalZhejiang UniversityHangzhouChina

OBJECTIVE To evaluate the feasibility and tolerability of metoprolol standard dosing pathway(MSDP)in Chinese patients with acute coronary syndrome(ACS).METHODS In this multicenter,prospective,open label,single-arm and interventional study that was conducted from February 2018 to April 2019 in fifteen Chinese hospitals.A total of 998 hospitalized patients aged≥18 years and diagnosed with ACS were *** MSDP was applied to all eligible ACS patients based on the standard treatment recommended by international *** primary endpoint was the percentage of patients achieving the target dose at discharge(V2).The secondary endpoints included the heart rate and blood pressure at V2 and four weeks after discharge(V4),and percentage of patients experiencing bradycardia(heart rate<50 beats/min),hypotension(blood pressure<90/60 mmHg)and transient cardiac dysfunction at V2 and *** Of the 998 patients,29.46%of patients achieved the target dose(≥95 mg/d)at *** total population was divided into two groups:target group(patients achieving the target dose at V2)and non-target group(patients not achieving the target dose at V2).There was significant difference in the reduction of heart rate from baseline to discharge in the two groups(-4.97±11.90beats/min vs.-2.70±9.47 beats/min,P=0.034).There was no significant difference in the proportion of bradycardia that occurred in the two groups at V2(0 vs.0,P=1.000)and V4(0.81%vs.0.33%,P=0.715).There was no significant difference in the proportion of hypotension between the two groups at V2(0.004%vs.0.004%,P=1.000)and V4(0 vs.0.005%,P=0.560).No transient cardiac dysfunction occurred in two groups during the study.A total of five adverse events(1.70%)and one serious adverse event(0.34%)were related to the pathway in target *** In Chinese ACS patients,the feasibility and tolerability of the MSDP have been proved to be acceptable.

关键词： patients prospective coronary

X-ray activity from different types of stars

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第7期19卷 87-102页

作者： Lin He Song Wang Xiao-Jie Xu Roberto Soria Ji-Feng Liu Xiang-Dong Li Yu Bai Zhong-Rui Bai jin-cheng guo Yan-Li Qiu Yong Zhang Ruo-Chuan Xu Ke-cheng Qian School of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 210093China United World College Changshu 215500China Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China College of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China International Centre for Radio Astronomy Research Curtin UniversityGPO Box U1987PerthWA 6845Australia Sydney Institute for Astronomy School of Physics A2& The University of SydneySydneyNSW 2006Australia WHU-NAOC Joint Center for Astronomy Wuhan UniversityWuhan 430072China Department of Astronomy Peking UniversityBeijing 100871China Nanjing Inst让ute of Astronomical Optics & Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China International Department the Affiliated High School of SCNUGuangzhou 510630China

X-ray emission is an important indicator of stellar *** this paper,we study stellar Xray activity using the XMM-Newton and LAMOST data for different types of *** provide a sample including 1259 X-ray-emitting stars,of which 1090 have accurate stellar parameter *** sample size is much larger than those used in previous *** find a bimodal distribution of the X-ray to optical flux ratio(log(fX/fV)) for G and K *** interpret that this bimodality is due to two subpopulations with different coronal heating ***,using the full widths at half maxima calculated from Hα and Hβ lines,we show that these stars in the inactive peaks have smaller rotational *** is consistent with the magnetic dynamo theory that presumes stars with low rotational velocities have low levels of stellar *** also examine the correlation between log(fX/fV) and luminosity of the excess emission in the Hα line,and find a tight relation between the coronal and chromospheric activity indicators.

关键词： X-rays stars-stars activity-stars late-type

Galactic halo age estimated from LAMOST DR4 and Gaia DR1

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第1期19卷 87-94页

作者： jin-cheng guo Hua-Wei Zhang Yang Huang Xiao-Wei Liu Ji-Feng Liu Mao-Sheng Xiang Bing-Qiu Chen Hai-Bo Yuan Zhi-Jia Tian Zhi-Ying Huo Chun Wang Department of Astronomy Peking University Kavli Institute for Astronomy and Astrophysics Peking University Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences South-Western Institute for Astronomy Research Yunnan University Department of Astronomy Beijing Normal University

The stellar halo is one of the major components in the Milky Way. Research on its age can provide critical constraints on the origin of the stellar halo and further on the formation of our *** far, different approaches and samples have been used to estimate the age of the Galactic halo. In our previous paper, we carefully selected 63 field halo turn-off stars within 1 kpc from the literature using a kinematic approach, then estimated the age of the halo. In this following work, we not only update the data from LAMOST DR4 and Gaia DR1, but also try a different method to select a clean halo sample by combining the metallicity and orbital parameters. Then we compare this halo turn-off sample with the GARSTEC model in the B-V vs. metallicity plane. After Monte Carlo simulations are performed, the age is estimated to be 10.5±1.4 Gyr, highly consistent with our previous result and other studies. However,due to the limited common sources between LAMOST DR4 and Gaia DR1, the final sample in this paper is still quite small. The estimated age will be more robust with the much larger Gaia DR2.

关键词： galaxies:halos Galaxy:evolution stars:kinematics and dynamics

原子簇化合物的固相合成及其三阶非线性光学性质的研究

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2000年第2期16卷 229-240页

作者：张弛金国成忻新泉南京大学化学化工学院

在戴安邦教授的指导下 ,我们实验室多年来在室温、近室温条件下采用固相反应法合成了一系列原子簇化合物 ,本文则对用此方法合成的Mo(W ) /S/Cu(Ag)原子簇化合物进行了分类和总结 ,并探讨了固相反应合成原子簇化合物的成簇规律和成簇机... 详细信息

在戴安邦教授的指导下 ,我们实验室多年来在室温、近室温条件下采用固相反应法合成了一系列原子簇化合物 ,本文则对用此方法合成的Mo(W ) /S/Cu(Ag)原子簇化合物进行了分类和总结 ,并探讨了固相反应合成原子簇化合物的成簇规律和成簇机理。同时本文还概括和总结了Mo(W ) /S/Cu(Ag)原子簇化合物的光限制效应 ,三阶非线性吸收与非线性折射等光学性质 ,初步探讨了Mo(W ) /S/Cu(Ag)

关键词：原子簇化合物固相合成非线性光学性质

Protein-coding genes combined with long noncoding RNA as a novel transcriptome molecular staging model to predict the survival of patients with esophageal squamous cell carcinoma

在线全文

学校读者我要写书评

暂无评论

Cancer Communications 2018年第1期38卷 50-62页

作者： jin-cheng guo Yang Wu Yang Chen Feng Pan Zhi-Yong Wu Jia-Sheng Zhang Jian-Yi Wu Xiu-E Xu Jian-Mei Zhao En-Min Li Yi Zhao Li-Yan Xu Key Laboratory of Molecular Biology in High Cancer Incidence Coastal Chaoshan Area of Guangdong Higher Education Institutes Shantou University Medical CollegeShantouGuangdong 515041P.R.China Department of Biochemistry and Molecular Biology Shantou University Medical CollegeShantouGuangdong 515041P.R.China Departments of Oncology Surgery Shantou Central HospitalAffiliated Shantou Hospital of Sun Yat-Sen UniversityShantouGuangdong 515041P.R.China Institute of Oncologic Pathology Shantou University Medical CollegeShantouGuangdong 515041P.R.China Key Laboratory of Intelligent Information Processing Advanced Computer Research CenterState Key Laboratory of Computer ArchitectureInstitute of Computing TechnologyChinese Academy of SciencesBeijing 100190P.R.China

Background:Esophageal squamous cell carcinoma(ESCC)is the predominant subtype of esophageal carcinoma in *** study was to develop a staging model to predict outcomes of patients with ***:Using Cox regression analysis,principal component analysis(PCA),partitioning clustering,Kaplan-Meier analysis,receiver operating characteristic(ROC)curve analysis,and classification and regression tree(CART)analysis,we mined the Gene Expression Omnibus database to determine the expression profiles of genes in 179 patients with ESCC from GSE63624 and GSE63622 ***:Univariate cox regression analysis of the GSE63624 dataset revealed that 2404 protein-coding genes(PCGs)and 635 long non-coding RNAs(lncRNAs)were associated with the survival of patients with *** categorized these PCGs and lncRNAs into three principal components(PCs),which were used to cluster the patients into three *** analysis demonstrated that the predictive ability of PCG-lncRNA PCs when applied to new patients was better than that of the tumor-node-metastasis staging(area under ROC curve[AUC]:0.69 vs.0.65,P<0.05).Accord-ingly,we constructed a molecular disaggregated model comprising one lncRNA and two PCGs,which we desig-nated as the LSB staging model using CART analysis in the GSE63624 *** LSB staging model classified the GSE63622 dataset of patients into three different groups,and its effectiveness was validated by analysis of another cohort of 105 ***:The LSB staging model has clinical significance for the prognosis prediction of patients with ESCC and may serve as a three-gene staging microarray.

关键词： Long non-coding RNA Protein-coding gene Esophageal squamous cell carcinoma Overall survival Staging model Transcriptome

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

CoTeMoO_6多晶粉体制备及光谱特征

功能材料 2014年第16期45卷 16143-16147页

作者：刘旭坡李珍金成国中国地质大学材料与化学学院武汉430000

利用固相反应法制备了CoTeMoO6 多晶粉体,研究了不同烧成温度下CoTeMoO6 试样的物相组成和显微形貌,对CoTeMoO6 粉体的红外和紫外-可见光谱特征进行了研究.研究结果表明,烧成温度为540-560 ℃,可制备出纯度高、结晶度好的单一CoTeMoO6 ... 详细信息

利用固相反应法制备了CoTeMoO6 多晶粉体,研究了不同烧成温度下CoTeMoO6 试样的物相组成和显微形貌,对CoTeMoO6 粉体的红外和紫外-可见光谱特征进行了研究.研究结果表明,烧成温度为540-560 ℃,可制备出纯度高、结晶度好的单一CoTeMoO6 相.将合成粉体在600 ℃下进行保温处理,微晶出现了沿（001）晶面的择优生长,可观察到一组平行解理;CoTeMoO6 在中红外波段具有透光波段宽和透过率高的特点,使CoTeMoO6 可以作为潜在的中红外光学材料;CoTeMoO6 在可见光区域（450-650nm）出现了一个吸收带,是由Co＾2＋外层电子发生d-d跃迁所致.

关键词： CoTeMoO6 物相组成显微形貌红外光谱紫外-可见光谱

New open cluster candidates discovered in the XSTPS-GAC survey

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第3期18卷 77-90页

作者： jin-cheng guo Hua-Wei Zhang Hui-Hua Zhang Xiao-Wei Liu Hai-Bo Yuan Yang Huang Song Wang Li Chen Hai-Bin Zhao Ji-Feng Liu Bing-Qiu Chen Mao-Sheng Xiang Zhi-Jia Tian Zhi-Ying Huo Chun Wang Department of Astronomy Peking University Kavli Institute for Astronomy and Astrophysics Peking University Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of Sciences South-Western Institute for Astronomy Research Yunnan University Department of Astronomy Beijing Normal University Shanghai Astronomical Observatory Chinese Academy of Sciences Purple Mountain Observatory Chinese Academy of Sciences

The Xuyi Schmidt Telescope Photometric Survey of the Galactic Anti-center（XSTPS-GAC）is a photometric sky survey that covers nearly 6000 deg^2 towards the Galactic Anti-center（GAC） in the g,r,i bands. Half of its survey field is located on the Galactic Anti-center disk,which makes XSTPSGAC highly suitable to search for new open clusters in the GAC region. In this paper,we report new open cluster candidates discovered in this survey,as well as properties of these open cluster candidates,such as age,distance and reddening,derived by isochrone fitting in the color-magnitude diagram（CMD）.These open cluster candidates are stellar density peaks detected in the star density maps by applying the method from Koposov et al. Each candidate is inspected in terms of its true color image composed from three XSTPS-GAC band images. Then its CMD is checked,in order to identify whether the central region stars have a clear isochrone-like trend differing from background stars. The parameters derived from isochrone fitting for these candidates are mainly based on three band photometry of ***,when these new candidates are able to be seen clearly in 2 MASS data,their parameters are also derived based on the 2 MASS（J-H,J） CMD. There are a total of 320 known open clusters rediscovered and 24 new open cluster candidates discovered in this work. Furthermore,the parameters of these new candidates,as well as another 11 previously known open clusters,are properly determined for the first time.

关键词： open clusters and associations general - Galaxy structure - methods data analysis