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GALEX Ultraviolet Photometry of Globular Clusters in M31

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GALEX Ultraviolet Photometry of Globular Clusters in M31Soo-Chang Rey 1,2,3,13,R.Michael Rich 1,4,Young-Wook Lee 2,Suk-Jin Yoon 5,Sukyoung K.Yi 5,Luciana Bianchi 6,Young-Jong Sohn 2,Peter G.Friedman 3,Tom A.Barlow 3,Yong-Ik Byun 2,Jose Donas 7,Karl Forster 3,Timothy M.Heckman 8,Myungkook J.Jee 8,Patrick N.Jelinsky 9,Suk-Whan Kim 2,Jae-Woo Lee 10,Barry F.Madore 11,Roger F.Malina 7,D.Christopher Martin 3,Bruno Milliard 7,Patrick Morrissey 3,Susan G.Ne?12,Jaehyon Rhee 2,3,David Schiminovich 3,Oswald H.W.Siegmund 9,Todd Small 3,Alex S.Szalay 8,Barry Y.Welsh 9,and Ted K.Wyder 3ABSTRACT We present ultraviolet photometry for globular clusters (GCs)in M31from 15deg 2of imaging using the Galaxy Evolution Explorer (GALEX).We detect 200and 94GCs with certainty in the near-ultraviolet (NUV;1750?2750?A )and far-ultraviolet (FUV;1350?1750?A )bandpasses,respectively.Our rate of detection is about 50%in the NUV and 23%in the FUV,to an approximate limiting V magnitude of 19.Out of six clusters with [Fe/H]>?1seen in the

NUV,none is detected in the FUV bandpass.Furthermore,we?nd no candidate

metal-rich clusters with signi?cant FUV?ux,because of the contribution of

blue horizontal-branch(HB)stars,such as NGC6388and NGC6441,which

are metal-rich Galactic GCs with hot HB stars.We show that our GALEX

photometry follows the general color trends established in previous UV studies

of GCs in M31and the https://www.sodocs.net/doc/1812984975.html,paring our data with Galactic GCs in the

UV and with population synthesis models,we suggest that the age range of M31

and Galactic halo GCs are similar.

Subject headings:galaxies:individual(M31)—galaxies:star clusters—

globular clusters:general—ultraviolet:galaxies

1.Introduction

The globular cluster(GC)system of M31has been the subject of intensive study,due to the similarity of M31to the Milky Way,its proximity,and the large numbers of cataloged clusters.Because the M31GCs can be resolved into stars with HubbleSpaceT elescope (HST)imaging(e.g.,Ajhar et al.1996;Rich et al.1996;Fusi Pecci et al.1996),it is possible to explore how integrated colors depend on the stellar content of the GCs and to do so in a galaxy that overall resembles the Milky Way.The general properties of the M31 GC system are described in recent reviews by Rich(2003),Jablonka(2002),and Barmby (2002).A recent optical/infrared catalog is published in Galleti et al.(2004).

Previous ultraviolet(UV)missions obtained photometry for Galactic GCs,beginning with the Orbiting Astronomical Observatory(OAO2),the Astronomical Netherlands Satellite(ANS),the International Ultraviolet Explorer(IUE),and the Ultraviolet Imaging Telescope(UIT)(Dorman,O’Connell,&Rood1995and references therein).The?rst UV imagery of the M31GC system was obtained using the UIT(Bohlin et al.1993).However, the UIT images from photographic?lm detected43GCs in the near-ultraviolet(NUV), while only four clusters had solid far ultraviolet(FUV)detections.These early observations allowed Bohlin et al.to compare the UV properties of a small sample of M31GCs with those of Galactic halo GCs and to conclude that the age range of the M31GC system resembled closely that of the Galactic GCs.However,a consistent and extensive set of UV photometry for the M31GC system is an important next step in this e?ort.Here we report on the?rst imagery of the M31GC system using the Galaxy Evolution Explorer(GALEX) satellite(Martin et al.2004).

In old stellar populations such as GCs,because of the relative longevity,hot He-burning horizontal-branch(HB)stars and their progeny are likely dominant UV sources(O’Connell 1999).Other sources of UV light in old populations are more di?cult to model:extreme blue HB stars,post-asymptotic giant-branch(PAGB)stars,blue stragglers,and X-ray binaries. While metallicity is the dominant parameter controlling HB morphology in the oldest (Galactic halo-like)stellar populations,a number of studies suggest that age di?erences between clusters are the most signi?cant second parameter a?ecting HB morphology(Lee, Demarque,&Zinn1994;Sarajedini,Chaboyer,&Demarque1997).Population models also suggest that in a broad sense,FUV photometry may have the potential to constrain age spreads within a galaxy,and also between galaxies(e.g.,Yi2003).As our vision expands to consider more distant galaxies,the properties of the M31and Galactic GC systems play a signi?cant role as templates because of the additional detailed information that we have about the clusters in these systems.

2.Observations and Data Analysis

GALEX imaged15slightly overlapping?elds of M31covering a total～15deg2 centered on M31;the mosaic covers most of the disk and halo of M31(Bianchi et al. 2004;Thilker et al.2004).The observations were obtained from2003September through October.The exposure times range from650to1700seconds,with each observation being obtained during the shadow crossing of one orbit.The satellite and on orbit performance of GALEX are described in Martin et al.(2004)and Morrissey et al.(2004).

Using the DAOPHOTII/ALLSTAR package(Stetson1987),we performed aperture photometry and point spread function(PSF)?tting photometry for all detected objects in the GALEX M31?elds.Although the PSF-?tting was often successful,there is some variation of the PSF within a?eld in these early images,and stellar images are often elongated,because of the as-yet imperfect removal of dithered pointing by image reduction pipeline.We consequently adopt aperture photometry for the?nal catalog.In order to deal with crowded?elds,we use a4-pixel radius aperture and derive aperture corrections using isolated objects of moderate brightness.We found that the aperture corrections are stable at the10%level;our?eld-to-?eld variation across the M31mosaic is also at the less than 10%level.We expect this to improve in the?nal coadded data set.Astrometry is obtained using objects for each?eld in common with the USNO-A2.0catalog(Monet et al.1998). The?nal photometry is on the AB magnitude system(Oke1990).

We adopt the catalog of Barmby et al.(2000,hereafter B00)which gives positions for a large fraction of M31GCs as well as optical magnitudes,reddening,and metallicity.Our

?nal catalog(M.Rich and S.-C.Rey et al.2004,in preparation)based on the fully co-added images will also match the full Bologna Catalog(Galleti et al.2004).For those clusters matching to less than5′′,we make subraster images(Figure1)and verify the unique UV to optical match by visual inspection.We reject those clusters falling more than0.55deg from the?eld center;the edge of the?eld has relatively poor positional accuracy and more severe image distortion.Among the435cluster candidates of B00,we con?rm200NUV and94FUV detections that have rms UV?optical positional agreement of less than2′′.

Figure2shows the fraction of M31GCs detected in the NUV and FUV bandpasses as a function of V magnitude and B?V color.Of the384GCs with both V and B?V data in B00,190(about50%)and89(about23%)GCs have been con?rmed in NUV and FUV,respectively.The color-magnitude diagram and color histogram show that most of the con?rmed GCs belong to blue clusters with B?V<1.2.In addition to lack of UV ?ux,a variety of factors(e.g.artifacts and uncertain identi?cation)may be responsible for the non-detection.Our limiting magnitude for NUV and F UV is about22AB magnitude, which corresponds to1mag fainter than that of the UIT observations.We detected seven (NUV)and?ve(FUV)of the GCs with X-ray emission in Di Stefano et al.(2002).While the detections range from0.06to4.69×1037ergsec?1we do not detect the two brightest X-ray clusters,Bo375and Bo82.

Reddening corrections for individual clusters(including foreground and internal to

M31)are based on a list of E(B?V)kindly provided by P.Barmby.We use the reddening law of Cardelli,Clayton,&Mathis(1989)for R NUV=8.90and R F UV=8.16(see also Bianchi et al.1996).In our all analyses,we used only M31GCs with E(B?V)<0.15, which corresponds to the median value of the E(B?V)distribution of M31GCs(B00), because uncertainty in the reddening and hence in the intrinsic colors increases for large values of E(B?V)(Barmby2002).

3.Results and Discussion

How similar in broad-band colors are the M31and Galactic GCs?Figure3is the UV?V colors versus V diagram for M31GCs.We compare both our sample and earlier UV satellite photometry,with dereddened optical magnitudes of B00.We convert magnitudes of the Galactic and UIT M31GCs to those of the GALEX?lter system using model spectral energy distributions for simple stellar populations(Yi2003).We place the Galactic GCs on these plots using the M31distance modulus of(m?M)0=24.43(Freedman&Madore 1990).The M31and Galactic GCs occupy the same locus in these plots,and we?nd no systematic di?erence between UIT and GALEX photometry.Bohlin et al.(1993)reported

a de?ciency of analogs to the blue Galactic GCs with(NUV?V)0～3.2but our GALEX data do not support their claim.Most GALEX M31GCs populate(NUV?V)0<4.3and (F UV?V)0<5.5,where we expect to?nd relatively UV bright clusters with bluer HB morphology.We surmise that the red GCs with(NUV?V)0>4.3must have redder HB morphologies and are relatively UV faint,since these red clusters are probably metal-rich and UV?V colors are very sensitive to metallicity.

Among their UIT sample,Bohlin et al.(1993)report blue clusters with

(NUV?V)0<2.5,which are much bluer than most M31and Galactic GCs.

They suggest that these clusters are not old GCs but instead are young clusters(see also Burstein et al.1984;Bohlin et al.1988;Cowley&Burstein1988).B00also note that their GC catalog may be contaminated by other young objects with B?V<0.55and exclude49 such objects from their analyses.Eight blue clusters of Bohlin et al.(1993)are included in our list of con?rmed GCs(?lled circles).Since E(B?V)for these clusters is not available in B00,we assume that they are only a?ected by the foreground Galactic reddening of

E(B?V)=0.10(Crampton et al.1985).The arrows indicate reddening vectors by an increase of E(B?V)=0.10.In our photometry,these clusters have bluer UV colors of (NUV?V)0<2.0and(F UV?V)0<3.0,which are consistent with the color limits of blue clusters suggested by Bohlin et al.(1993).We will discuss the properties of these blue clusters in our forthcoming paper.

Figure4shows the distribution of our UV?V colors versus[Fe/H],as an analog of the HB type versus[Fe/H]diagram(Lee et al.1994;as such,bluer colors are now on the right), for M31and Galactic GCs.The range in the UV?V colors(compared to B?V)is striking. While the M31GCs extend over a wide range of(NUV?V)0color,the FUV sample is biased to the blue and metal-poor GCs with no redder[(F UV?V)0>5.5]clusters due to their faint F UV magnitudes.We also superpose our three model isochrones for di?erent ages(?t=-2,0,and+2Gyr),which are constructed from our evolutionary population synthesis models of GCs in the GALEX?lter system(see also Lee,Lee,&Gibson2002). The?t=0Gyr line(solid line)corresponds to inner halo Galactic GCs(Galactocentric radius≤8kpc)at12Gyr.The?t=+2Gyr(long dashed line)and-2Gyr(short dashed line)lines are for the models2Gyr older and younger than the Galactic GCs,respectively. These models include the treatment of the detailed systematic variation of HB morphology with age and metallicity and the contribution from PAGB stars.The models?t well the range in color of the clusters and their general locus on the age-metallicity plot.

We?nd no metal-rich clusters with signi?cant FUV?ux,as is present in the two peculiar Galactic GCs,NGC6388and NGC6441(Rich et al.1997).These two clusters have hot HB stars that are seen in no other Galactic GCs of comparable metallicity(e.g.,

47Tuc)that have only red HBs.The arrows represent the upper limit of the metal-rich clusters that were detected in NUV.There is a hint of dispersion at high metallicity in the (NUV?V)0versus[Fe/H]plot;if con?rmed,this may re?ect a milder version of the second parameter at high metallicity.

Many M31GCs are resolved by HST,and for those we get HB morphology directly, which makes possible a comparison of the integrated properties of GCs with their actual resolved stellar populations.In order to see the UV?ux variation with di?erent metallicity and HB morphologies of GCs,we plot three di?erent groups of GCs with known HB morphology from previous HST observations(Ajhar et al.1996;Fusi Pecci et al.1996;Rich et al.1996;Holland,Fahlman,&Richer1997;Rich2003):metal-poor blue HB(BHB)GCs with[Fe/H]～-1.9(?lled circles;G64and G351),intermediate metallicity red HB(RHB) GCs with[Fe/H]～-1.1(?lled squares;G1and G322),and metal-rich red clump GCs with [Fe/H]～-0.6(?lled triangles;G58,G319,and G312).The sensitivity of metallicity and HB morphology to the UV?ux is evident in both UV bands,i.e.,the metal-poor BHB clusters show bluer UV?V colors than the metal-rich red clump clusters,con?rming the e?ect of the HB morphology on the UV?V colors.

We also plot M2and M72,obtained from the GALEX All-sky Imaging Survey observations.The exposure times were129and112sec for M2and M72,respectively. The integrated NUV and F UV magnitudes were measured from the concentric large apetures(300′′and120′′radius for M2and M72,respectively)containing the total UV light of GCs.The error bar shows the magnitude variation due to the di?erent aperture size(20%variation of aperture radius).Although M2([Fe/H]～-1.58;pentagon)and M72 ([Fe/H]～-1.54;hexagon)have similar metallicities(Lee et al.1994),they have di?erent HB morphologies,in the sense that M2has bluer HB morphology.They show signi?cantly di?erent(F UV?V)0colors[?(F UV?V)0～1.11]that are consistent with their di?erent HB morphologies.

In the plot of(NUV?V)0color against[Fe/H],M31and Galactic GC data appear to follow the trend indicated by the isochrones,a general correlation between(NUV?V)0 color and metallicity.On the other hand,comparison of the(F UV?V)0color with the models suggests the promise of gleaning age information(Yi2003),provided that other sources of a small part of the scatter in Fig.4(e.g.,extreme HB,PAGB stars,and low mass X-ray binaries;King et al.1993)can be quanti?ed.In the(F UV?V)0color versus [Fe/H]diagram,M31and Galactic GCs are well located in the age range(±2Gyr)of model predictions and show no signi?cantly di?erent age distribution between two GC systems, indicating that the M31and Galactic GC systems show similar mean age and age spread, at least,for the oldest GCs.This is consistent with claims for age spread in the Galactic

and M31GCs(Rosenberg et al.1999;Barmby&Huchra2000;Salaris&Weiss2002).

The authors thank Pauline Barmby for kindly providing her catalog of M31clusters. We are also grateful to Carla Cacciari for valuable comments.GALEX(Galaxy Evolution Explorer)is a NASA Small Explorer,launched in2003April.We gratefully acknowledge NASA’s support for construction,operation,and science analysis for the GALEX mission. Yonsei University participation is funded by the Korean Ministry of Science and Technology, for which we are grateful.

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Fig.1.—GALEX images of con?rmed M31GCs for NUV(top),FUV(middle),and optical band images from the Palomar Observatory Sky Survey(bottom).All images are90arcsec2.

Fig. 2.—Con?rmed M31GCs in the NUV and FUV bands.Open and?lled circles show GCs of Barmby et al.(2000)con?rmed in the GALEX NUV and FUV,respectively;crosses are not detected in the UV but are in the catalog of Barmby et al.The histograms are for the384clusters in Barmby et al.(solid histogram)and for the190and89clusters that are con?rmed in NUV(dashed histogram)and FUV(shaded histogram),respectively.As might

be expected,we are more successful at detecting bluer clusters.

Fig. 3.—UV?V colors vs V diagrams for GALEX M31GCs with E(B?V)<0.15. GALEX M31GCs(open circles)are compared with previous UIT results for M31(?lled squares;Bohlin et al.1993)and Galactic GC results obtained from OAO-2and ANS(crosses; Dorman et al.1995).Young cluster candidates(?lled circles)are also shown with arrows indicating reddening vectors by an increase of E(B?V)=0.10(see text).The sloping

dashed line is our limiting magnitude.

Fig. 4.—UV?V colors vs[Fe/H]diagrams for M31(open circles)and Galactic(crosses; [Fe/H]from Harris1996)GCs.The GALEX FUV sample is biased to the blue and metal-poor GCs because of our detection limit in FUV.Arrows indicate expected location of metal-rich([Fe/H]>-0.8)M31GCs in FUV;NGC6388and NGC6441,which are metal-rich Galactic GCs with hot BHB stars(Rich et al.1997),are indicated where they would be found if counterparts were present in M31.We plot three di?erent groups of M31GCs with known HB morphologies from previous HST observations.Two Galactic GCs,M2 (pentagon)and M72(hexagon),obtained from GALEX observations are also plotted.We also superpose our model isochrones indicating ages relative to the mean Galactic halo(see text).In(F UV?V)0vs[Fe/H],M31and Galactic GCs are located in the age range(±2 Gyr)of model predictions and there is no indication for a systematic di?erence between M31

and the Milky Way.

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小学生英文版自我介绍范文6篇

小学生英文版自我介绍范文6篇Self introduction model for primary school students 编订：JinTai College

小学生英文版自我介绍范文6篇前言：自我介绍是向别人展示你自己，直接关系到你给别人的第一印象的好坏及以后交往的顺利与否，也是认识自我的手段。自我介绍是每个人都必然要经历的一件事情，日常学习、工作、生活中与陌生人建立关系、打开局面的一种非常重要的手段，通过自我介绍获得到对方的认识甚至认可，是一种非常重要的技巧。本文档根据自我介绍内容要求和特点展开说明，具有实践指导意义，便于学习和使用，本文下载后内容可随意调整修改及打印。本文简要目录如下：【下载该文档后使用Word打开，按住键盘Ctrl键且鼠标单击目录内容即可跳转到对应篇章】 1、篇章1：小学生英文版自我介绍范文 2、篇章2：小学生英文版自我介绍范文 3、篇章3：小学生英文版自我介绍范文 4、篇章4：小学生英文版自我介绍范文 5、篇章5：小学生英文版自我介绍范文 6、篇章6：小学生英文版的自我介绍文档

自我介绍是人必然要经历的一件事情小学生开学的时候认识新的同学、老师就要做好自我介绍。本文是小泰为大家整理的小学生英文版自我介绍范文，仅供参考。篇章1:小学生英文版自我介绍范文 Good afternoon, teachers! My name is YangXiaodan. I`m 11 now. I`m from Class2 Grade 5 of TongPu No.2 Primary School. My English teacher is Miss Sun. She`s quiet and kind. She`s short and young. My good friend is ZhangBingbing. She`s 12.She`s tall and pretty. We`re in the same class. We both like English very much. I like painting , listening to music, playing computer games and reading books. My favourite food is chicken. It`s tasty and yummy. I often do my homework and read books on Saturdays. This is me. Please remember YangXiaodan. Thank you very much! 篇章2:小学生英文版自我介绍范文【按住Ctrl键点此返回目录】Good afternoon, teachers! I`m very happy to introduce myself here. I`m Scott. My Chinese name is

自我介绍(英文版)

面试自我介绍英文版面试自我介绍英文版：For reference onlyGood morning ! Everyone! (or Ladies and gentlemen) It is my great honor to have this opportunity to introduce myself. and I hope I could make a good performance today, eventually become a member of your school. Now let me introduce myself please. I’m a graduate student from MAOMING UNIVERSITY . My name is TOM ,21 years old. , born in MAOMING. GuangDong province . My major is English, and I will graduate this June. In the past 3 years,I spent most of my time on English studying and practise. I have a good command of both spoken and written English and past CET-4 with a ease. Skilled in use of Office 2003, excel. My graduate school training combined with my cadet teacher should qualify me for this particular job. Although perhaps I’m not the best among the candidates, but with my strong knowledge background and full enthusiasm for education, I am sure I will satisfy you well.

个人先进事迹简介

个人先进事迹简介 01 在思想政治方面,xxxx同学积极向上,热爱祖国、热爱中国共产党,拥护中国共产党的领导.利用课余时间和党课机会认真学习政治理论,积极向党组织靠拢. 在学习上,xxxx同学认为只有把学习成绩确实提高才能为将来的实践打下扎实的基础,成为社会有用人才.学习努力、成绩优良. 在生活中,善于与人沟通,乐观向上,乐于助人.有健全的人格意识和良好的心理素质和从容、坦诚、乐观、快乐的生活态度,乐于帮助身边的同学,受到师生的好评. 02 xxx同学认真学习政治理论,积极上进,在校期间获得原院级三好生,和校级三好生,优秀团员称号,并获得三等奖学金. 在学习上遇到不理解的地方也常常向老师请教,还勇于向老师提出质疑.在完成自己学业的同时,能主动帮助其他同学解决学习上的难题,和其他同学共同探讨,共同进步. 在社会实践方面,xxxx同学参与了中国儿童文学精品“悦”读书系,插画绘制工作,xxxx同学在班中担任宣传委员,工作积极主动,认真负责,有较强的组织能力.能够在老师、班主任的指导下独立完成学院、班级布置的各项工作. 03 xxx同学在政治思想方面积极进取,严格要求自己.在学习方面刻苦努力,不断钻研,学习成绩优异,连续两年荣获国家励志奖学金；作

为一名学生干部,她总是充满激情的迎接并完成各项工作,荣获优秀团干部称号.在社会实践和志愿者活动中起到模范带头作用. 04 xxxx同学在思想方面,积极要求进步,为人诚实,尊敬师长.严格要求自己.在大一期间就积极参加了党课初、高级班的学习,拥护中国共产党的领导,并积极向党组织靠拢. 在工作上,作为班中的学习委员,对待工作兢兢业业、尽职尽责的完成班集体的各项工作任务.并在班级和系里能够起骨干带头作用.热心为同学服务,工作责任心强. 在学习上,学习目的明确、态度端正、刻苦努力,连续两学年在班级的综合测评排名中获得第1.并荣获院级二等奖学金、三好生、优秀班干部、优秀团员等奖项. 在社会实践方面,积极参加学校和班级组织的各项政治活动,并在志愿者活动中起到模范带头作用.积极锻炼身体.能够处理好学习与工作的关系,乐于助人,团结班中每一位同学,谦虚好学,受到师生的好评. 05 在思想方面,xxxx同学积极向上,热爱祖国、热爱中国共产党,拥护中国共产党的领导.作为一名共产党员时刻起到积极的带头作用,利用课余时间和党课机会认真学习政治理论. 在工作上,作为班中的团支部书记,xxxx同学积极策划组织各类团活动,具有良好的组织能力. 在学习上,xxxx同学学习努力、成绩优良、并热心帮助在学习上有困难的同学,连续两年获得二等奖学金. 在生活中,善于与人沟通,乐观向上,乐于助人.有健全的人格意识和良好的心理素质.

简单自我介绍的中英文版

简单自我介绍的中英文版有些要求比较高的公司，首先要求你自我介绍一下，介绍完成后会让你将刚才的自我介绍用英文版自我介绍一遍，如果你没有准备，那肯定是会应负不来。下面是一个简单自我介绍的中英文范文，供大家参考。中文版：大家好，我叫xxx，男，今年21，外语学院大4学生，学的是英语专业，2外法语，通过专业英语6级，明年即将毕业获得学士学位，很荣幸今天能参加这次面试，我有信心，所以一定能够有好的表现，谢谢给我这个机会英文版： tout le monde bon, jappelle xxx, le male, 21, linstitut de grands 4 étudiants de langues étrangères, étudie cette année suis des spécialités anglaises, 2 fran?ais dextérieur, par langlais spécialisé6 niveaux, bient?t après dipl?médannée obtiendrai la licence, est honoréaujourdhui pour pouvoir beaucoup participer àcette heure dinterviewer, jaurai la confiance, donc pourrai certainement avoir la bonne apparence, 1 ————来源网络整理，仅供供参考

remercierai de moi cette occasion 好的自我介绍会为你的面试加分不少。祝你成功！ ————来源网络整理，仅供供参考 2

电子烟设计手册

想他人之不想为他人之不为

电子烟-壳料篇烟弹：PCTG（透明塑料），缩水通常放千分之五，较PC易成型，附着力更好，较高的耐冲击性，机械性能良好，通常料通溶温在240-260度，在料桶停留时间不能超过4 分钟，否则容易降解. 设计壁厚最少0.6以上.检测方法是用300g的钢球在距离1米的高度自由冲击材料，材料允许有变形，不允许有裂口视为OK，重点关注熔接痕处，有问题需要开排料口.材料主要有美国伊士曼和韩国SK生产，美国产伊士曼产的好. 密度是1.18. 烟嘴：PEI(透明琥珀色，如果低端用ABS),PEI缩水通常放千分之五，密度1.28-1.42g/CM(立方），较好的阻燃性和低烟性，防火等级V0级，具有优越的热稳定性，有优越的机械性，电绝缘性，耐辐照性，耐高低温及耐磨性等. 电池仓：ABS是最常用的工程塑料，缩水通常放千分之五，密度1.05，具有较好的附着力，良好的流动性，抗冲击性，易加工性，易成型及着色，低气味性，耐腐蚀性等优异特点.ABS 757具有高刚性，高光性中冲击强度特点，ABS 727具有优异的挂镀性，电镀不起皮，不起泡，电镀牢固不脱落，ABS 777,高耐高温性，耐高温105度，价格适中，流动性好，ABS 765具有高抗冲，防火等级V0. 导光柱及其他：PC（有透明和不透明），缩水率通常千分之五，密度1.2，具有高强度，耐疲劳性，耐老化性，高透明性，耐绝缘性，耐高温性等优点，缺点是流动性较 ABS差，PC 6557（德国拜耳）阻燃级抗紫外线，PC3108,3208耐冲击性FDA食品级高粘，PC 1225，1250高透明 FDA阻燃，V2级日本帝人，PC 3215泰国三菱光学级材料，PC1414常用基础牌号，流动性中等，耐低温-40度，高温135度.

大学生自我介绍英文版带翻译

大学生自我介绍英文版带翻译大学生英文自我介绍是怎样的呢在毫无头绪前我们可以多看看一些经典的自我介绍范文。下面是小编收集整理的大学生英文自我介绍范文，欢迎阅读借鉴，更多资讯请继续关注自我介绍栏目。大学生英文自我介绍范文一I had accept your elders and teachers of good ideological and moral education, strict with oneself, honest, hard working, be selfmotivated, constantly in the university three years, after college half militarization management, make oneself become more strong. As a computer professional students, I love this professional and for its input great enthusiasm and energy. I thought positive progress, the personality is bright, the life style of rigorous, a strong sense of responsibility, handle affairs composed, persistence, can bear hardships and stand hard work, strong adaptability, have good psychological quality. I motivated actively seek, love the motherland, support the communist party of China, to the party organization actively, aligning with our great communist party of China. I still adhere to the four cardinal principles

优秀党务工作者事迹简介范文

优秀党务工作者事迹简介范文优秀党务工作者事迹简介范文 ***，男，198*年**月出生，200*年加入党组织，现为***支部书记。从事党务工作以来，兢兢业业、恪尽职守、辛勤工作，出色地完成了各项任务，在思想上、政治上同党中央保持高度一致，在业务上不断进取，团结同事，在工作岗位上取得了一定成绩。一、严于律己，勤于学习作为一名党务工作者，平时十分注重知识的更新，不断加强党的理论知识的学习，坚持把学习摆在重要位置，学习领会和及时掌握党和国家的路线、方针、政策，特别是党的十九大精神，注重政治理论水平的提高，具有坚定的理论信念;坚持党的基本路线，坚决执行党的各项方针政策，自觉履行党员义务，正确行使党员权利。平时注重加强业务和管理知识的学习，并运用到工作中去，不断提升自身工作能力，具有开拓创新精神，在思想上、政治上和行动上时刻同党中央保持高度一致。二、求真务实，开拓进取在工作中任劳任怨，踏实肯干，坚持原则，认真做好学院的党务工作，按照党章的要求，严格发展党员的每一个步骤，认真细致的对待每一份材料。配合党总支书记做好学院的党建工作，完善党总支建设方面的文件、材料和工作制度、管理制度等。

三、生活朴素，乐于助人平时重视与同事间的关系，主动与同事打成一片，善于发现他人的难处，及时妥善地给予帮助。在其它同志遇到困难时，积极主动伸出援助之手，尽自己最大努力帮助有需要的人。养成了批评与自我批评的优良作风，时常反省自己的工作，学习和生活。不但能够真诚的指出同事的缺点，也能够正确的对待他人的批评和意见。面对误解，总是一笑而过，不会因为误解和批评而耿耿于怀，而是诚恳的接受，从而不断的提高自己。在生活上勤俭节朴，不铺张浪费。身为一名老党员，我感到责任重大，应该做出表率，挤出更多的时间来投入到**党总支的工作中，不找借口，不讲条件，不畏困难，将总支建设摆在更重要的位置，解开工作中的思想疙瘩，为攻坚克难铺平道路，以支部为纽带，像战友一样团结，像家庭一样维系，像亲人一样关怀，践行入党誓言。把握机遇，迎接挑战，不负初心。

英文自我介绍中英文对照【最新版】

英文自我介绍中英文对照 Good morning/afternoon teachers and classmates.I'm XXX.I am a girl of 13.My family including my father,mother and me.I like basketball best.In addition,I also like table tennis.My favorite food is carrots.I'm also very interested in snacks.What,I'm good at https://www.sodocs.net/doc/1812984975.html,ing the computer E-mail,shopping and even solve my problems in the study and the life is so convenient.So I put my computer as my good helper.As for reading,I've read about magic novel.Are these.Nice to meet you!I sincerely hope to make friends with you. 翻译: 好早上/下午老师和同学。我是XXX。我是一个13岁的女孩。我家包括我爸爸，妈妈和我。我最喜欢篮球。此外，我还喜欢桌上网球。我最喜欢的食物是胡萝卜。我现在也在小吃很感兴趣。什么，我很好的电脑。用电脑发邮件，购物，甚至解决我的问题研究中，生命是如此方便。所以我把我的电脑是我的好帮手。作为阅读，我读过一些关于魔法的小说。是这些。好见到你!我真诚地希望与你交朋友。

主要事迹简介怎么写(2020年最新)

主要事迹简介怎么写概括?简要地反映?个单位(集体)或个?事迹的材料。简要事迹不?定很短，如果情况多的话，也有?千字的。简要事迹虽然“简要”，但切忌语?空洞，写得像?学?期末鉴定。 ?应当以事实来说话。简要事迹是对某单位或个?情况概括?简要地反映情况，?如有三个??很突出，就写三个??，只是写某???时，要把主要事迹突出出来。简要事迹?般来说，?少要包括两个??的内容。?是基本情况。简要事迹开头，往往要??段?字来表述?些基本情况。如写?个单位的简要事迹，应包括这个单位的?员、承担的任务以及?段时间以来取得的主要成绩。如写个?的简要事迹，应包括该同志的性别、出?年?、参加?作时间、籍贯、民族、?化程度以及何时起任现职和主要成绩。这样上级组织在看了材料的开头，就会对这个单位或个?有?个基本印象。?是主要特点。这是简要事迹的主体部分，最突出的事例有?个??就写成?块，并按照?定的逻辑关系进 ?排列，把同类的事例排在?起，?个??通常由?个?然段或?个?然段组成。写作时，特别要注意以下四点： 1.?第三?称。就是把所要写的对象，是集体的?“他们”来表述，是个?的称之为“他(她)”。 (她)”，单位可直接写名称，个?可写其姓名。为了避免连续出现?个“他们”或“他 2.掌握好时限。?论是单位或个?的简要事迹，都有?个时间跨度，既不要扯得太远，也不要故意混淆时间概念，把过去的事当成现在的事写。这个时间跨度多长，要根据实际情况 ?定。如上级要某个同志担任乡长以来的情况就写他任乡长以来的事迹;上级要该同志两年来的情况，就写两年来的事迹。当然，有时为了需要，也可适当地写?点超过这个时间的背景情况。 3.?点他?的语?。就是在写简要事迹时，可?些群众的语?或有关?员的语?，这样会给??种?动、真切的感觉，衬托出写作对象?较?的思想境界。在?他?语?时，可适当加?，但不能造假。 4.?事实说话。简要事迹的每?个??可分为多个层次，?个层次先??句话作为观点，再???两个突出的事例来说明。?事实说话时，要尽量把?个事例说完整，以给?留下深刻印象。

英文版自我介绍翻译(共4篇)

篇一：面试用英语自我介绍怎么说面试用英语自我介绍怎么说? 面试过程中自我介绍是在所难免的，中文自我介绍尚且难倒了很多人，更何况是英文自我介绍呢，但是面试用英语自我介绍在一些外资企业或者和英语相关岗位也是不可避免的。今天我们就说一说面试用英语自我介绍怎么说? 其实自我介绍大体都是一样的，简单的基本介绍，个人情况和兴趣爱好的一个阐述，话不多说先举一个例子吧。(先英文后中文吧) hello, everybody, my name is xxx, my personality alacrity is bright, i like to make friend, enjoying to read some books about philosophy usually, i like discussing problems with my friends together, i feel very happy to know everyone, hoping to get along with everyone delectation in the day of aftertime. 大家好，我是xxx，我的性格活泼开朗，喜欢交流，日常生活中我喜欢看一些哲学性的书，很喜欢和朋友一起探讨问题，非常高兴认识大家，在之后的生活里能够和大家相处融洽。大家在做英文自我介绍过程不用担心和害怕，并不是所有的面试官英文水平都很好，有些可能根本就听不懂你在说什么，在这个面试过程中你最重要的是要保持微笑和自信，无论多么蹩脚的英文你首先要保证流利和自信就可以了。篇二：考研英语自我介绍及各个专业所对应的英语翻译考研英语自我介绍及各专业所对应英语翻译自我介绍(self-introduce) (5．结束语)ok, that is all, thank you for your attention. 2你的家庭(about family) with me, and encourage me not to give up. during my preparation for graduate examination, the support from my family is always my momentum([m?ument?m]). their love is unselfish, i am deeply affected, so i will do all what i can to repay them. 3.介绍你的家乡(about hometown) 4.你的大学(about university) i have spent 4 years of good times there and the unselfish assistance from my teachers and schoolmates deserves my appreciation. when i decided to go on for further study, my teachers suggested that i should walk out of the original campus to broaden my horizons ,besides your university has a good atmosphere . 5. why do you choose to study in our department? there are several reasons for my choice: first of all, the subjects i have learned in huadong are partly the same with the subjects here and my teachers encourage me to go for further study in other schools to broaden my horizons ,without doubt this university is the best in our country ;what’s more i am deeply affected by my uncle who is a driller, so i choose the subject --oil-gas well engineering; last but not least, i am deeply impressed by the academic atmosphere here. 6.your graduation design and advisor my graduation design title is “numerical simulation of water jet”, which means through numerical simulation i should find the effect of the shape of water hole and nozzle on the water jet. our design began just several weeks ago, and i was busy with the preparation for second examinations, after i have found many relevant spe documents, now i am trying to use special software “fluent “perfectly. 各工程与技术科学专业所对应英文翻译下面是各种工程与技术科学专业所对应的英文翻译

自我介绍英文版带翻译

Introduce Yourself Professionally 专业自我介绍 1. Self-introduction sample for a job interview | 工作面试自我介绍我叫赖利。我是刚从鲍尔州立大学毕业的。今年夏天我一直在一个小学夏令营工作，我很高兴能找到下一学年的第一个教学职位。我有几个最初的教案，我创建了我的教学实习，我期待着在我自己的课堂上实施。我自己也上过布鲁克伍德小学，相信我会非常适合你们二年级的开学典礼。在激发我对学习的热爱的同一个地方教学生对我来说是一种快乐。 My name is Riley See. I’m a recent graduate from Ball State University. I’ve been working at a camp for elementary children this summer, and I’m excited to find my first teaching position for the coming school year. I have several original lesson plans I created during my teaching internship that I look forward to implementing in my own classroom. I attended Brookwood Elementary myself and believe I would be a great fit for your second grade opening. It would be a joy for me to teach students in the same place that sparked my love of learning. 2. Self-introduction sample for a presentation| 演讲自我介绍下午好。我叫Calob Cor，是Northern Investment的行政和财务副总裁。我一直热衷于寻找省钱的聪明方法。我相信尽早制定理财策略是确保你未来的关键。我在大学期间就开始使用这些策略，现在我的退休基金已经超过1000万美元。这个数字每天都在增长，我也来教你如何建立这样的账户。 Good afternoon. My name is Calob Cor and I’m the VP of Administration and Finance at Northern Investing. I’ve always been passionate about finding smart ways to save money. I believe establishing money management strategies as early as possible is the key to securing your future. I began using these strategies myself as I was working through college, and I now have over $10 million in my retirement fund.

大学生先进事迹简介怎么写

大学生先进事迹简介怎么写苑xx，男，汉族，1990年07月22日出生，中国共青团团员，入党积极分子，现任xx学院电气优创0902班班长，担任xx学院09级总负责人、xx学院团委学生会科创部干事、xx学院文艺团主持部部长。步入大学生活一年以来，他思想积极，表现优秀，努力向党组织靠拢，学习刻苦，品学兼优，工作认真负责，脚踏实地，生活勤俭节约，乐于助人。一直坚持多方面发展，全面锻炼自我，注重综合能力、素质拓展能力的培养。再不懈的努力下获得了多项荣誉： ●获得09-10学年xx大学“百佳千优”(文化体育)一等奖学金和“百佳千优”(班级建设)二等奖学金; ●获得09-10学年xx大学“优秀学生干部”荣誉称号; ●2010年xx大学普通话知识竞赛中获得一等奖; ●2010年xx大学主持人大赛中获得一等奖，被评为金话筒; ●xx学院首届“大学生文明修身”活动周——再生比赛中获得一等奖; ●xx学院首届“大学生文明修身”活动周——演讲比赛中获得一等奖。一、刻苦钻研树学风作为班长，他在学习方面，将班级同学分成各个学习小组，布置每日学习任务，分组竞争，通过开展各项趣味学习活动，全面调动班级同学的积极性，如：排演英语戏剧、文学常识竞答、数学辅导小组等。他带领全班同学努力学习、勤奋刻苦，全班同学奖学金获得率达91%，四级通过率达66%。二、勤劳负责建班风

在日常班级工作中，他尽心尽力，通过网络组织建立班级博客，把班级的日常情况，班级比赛，特色主题班会等活动，及时上传到班级博客，以方便更多同学了解自己的班级，也把班级的魅力、特色，更全面、更具体的展现出来。在班级建设中，他带领全班同学参加学院组织的各项文体活动中也收获颇多： ●在xx学院首届“大学生文明修身”活动周中荣获第二名， ●xx学院首届乒乓球比赛中荣获第一名、精神文明奖， ●在xx学院“迎新杯”男子篮球赛中荣获第四名、最佳组织奖。除了参加学院组织的各项活动外，为了进一步丰富班级同学们的课余生活，他在班级内积极开展各式各样的课余活动： ●普通话知识趣味比赛，感受中华语言的魅力，复习语文文学常识，为南方同学打牢普通话基础，推广普通话知识。 ●“我的团队我的班”主题班会活动中，创办特色活动“情暖你我心”天使行动，亲切问候、照顾其他同学的生活、学习方面细节小事，即使在寒冷的冬天，也要让外省的同学感受到家一样的温暖。 ●“预览科技知识”科技宫之行，作为现代大学生，不能只顾书本知识，也要跟上时代，了解时代前沿最新科技。 ●感恩节“感谢我们身边的人”主题班会活动，在这个特殊的节日里，他带领同学们通过寄贺卡、送礼物等方式，来感谢老师辛勤的付出;每人写一封家书，寄给父母，感谢父母劳苦的抚育，把他们的感激之情，转化为实际行动来感化周围的人;印发感恩宣传单，发给行人，唤醒人们的感恩的心。三、热情关怀暖人心生活中，他更能发挥榜样力量，团结同学，增强班级凝聚力。时刻观察每一位同学的情绪状态，在心理上帮助同学。他待人热情诚恳，积极帮助生活中有困难的同学：得知班级同学生病高烧，病情严重，马上放下午饭，赶到同学寝室，背起重病同学到校医院进行