DOCSLIB.ORG

IGRINS and the Evolution of Young Stars and Their Disks

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
IGRINS and the Evolution of Young Stars and Their Disks IGRINS and the evolution of young stars and their disks Gregory J. Herczeg (沈雷歌, Shěn Léigē ) Kavli Institute for Astronomy and Astrophysics, Peking University Pre-main sequence stellar evolution Protostar Classical T Tauri star Weak-line T Tauri star Low mass stars Stellar Growth (BAE Jaehan+2014) New JCMT Transient Survey PIs Herczeg, Johnstone ALMA HL Tau (disk+remnant envelope) IRS 48: full gas ring revealed Dust trap in a transition disks Cycle 2 data Band 9 (van der Marel PI) (van der Marel+2013, 2015) Dust: trapped at 50 AU CO 6-5: symmetric 0.44 mm cont 13CO 6-5 Comet/KBO factory? Van der Marel et al. in prep - Dust trap optically thick, blocking some of 13CO emission? - Kinematics of gas around dust trap can test vortex model (Proto?)-planet detection in a disk hole 3 Myr old Kraus & Ireland 2012: see also Quanz+2014, 2015 Disk lifetimes Planet formation Lifetimes of Envelope Disk lifetimes Planet formation Lifetimes of Envelope Veiling: emission from disk/accretion weakens photospheric lines Optical spectra of TW Hya on different days Near-IR: disk wall variability (e.g., Ingleby+2015; Stauffer+2015) Emission lines may fill in absorption lines (TW Hya; Herczeg+ in prep) Spectral types and extinctions in Taurus (Herczeg & Hillenbrand 2014) Accretion, extinction, and veiling simultaneously on 283 stars 1 mag discrepancy with near-IR extinctions (e.g.Furlan+) Recalibrate SpT-Temperature conversion based on BT-Settl models (but see Tottle & Mohanty for caveats) 14 Changes in stellar parameters: DM Tau Herczeg Previously M1: M=0.68 Msun, age = 11 Myr (old Baraffe models) Classified as M3: M=0.38 Msun, age = 3.5 Myr Fig. 16.— The red optical spectra of DM Tau (top, M2.9) and TW Hya (bottom, M0.6), after subtracting a flat accretion continuum. DM Tau is classified as an M2.9 while TW Hya is classified as M0.6. Previous spectral type measurements are inconsistent with the observed spectra. UScoCTIO 33 was originally identified as a possible 4.3.2. DM Tau member of the Upper Scorpius OB Association in a pho- tometric survey by Ardila et al. (2000). A spectroscopic The literature spectral type of M1 for DM Tau traces survey by Preibisch et al. (2002) confirmed membership, back to Cohen & Kuhi (1979). Despite significant in- classified the star as M3, and found strong Hα emission terest as the host of a transition disk (e.g. Calvet et al. indicative of accretion. 2005), its spectral type has not been reassessed using Figure 15 shows our Keck spectrum of UScoCTIO modern techniques. 33 compared with M3 and M4.5 stars with a veiling Fig. 16 shows the veiling-corrected DM Tau spectrum r7525=0.0 and 0.25. If the veiling is 0, the red spectrum 29 Dec. 2008, compared with M2, M2.9, and M4 spectra. is best classified as an M3 spectral type, with only small The veiling is calculated from the depth of the Ca I 4227 inconsistencies between the template and the spectrum. A˚ line. The veiling r7510 =0.17 leads to SpT of M2.9 However, the M3 template spectrum is much weaker than and AV =0.08. If the composite photospheric+accretion the observed blue emission. spectrum is not constrained by a good fit to the Ca I The veiling r7525=0.25 is calculated from the depth λ4227 line, then r7510 could range from 0.09, with SpT of the Ca I λ4227 line. Subtracting this accretion con- M2.7 and AV = −0.20, to 0.31, with SpT M3.4 and AV = tinuum off of the observed spectrum yields photospheric 0.50. In this case, the extinction actually increases with lines that are deeper than the uncorrected observation. later spectral type because the veiling has increased. If The consequent M4.5 spectral type with veiling improves the blue side is ignored entirely, then a veiling of r7510 =0 the fit to the red and blue spectra. would yield M2.5 and AV =0.06 while an upper limit With an M4.5 SpT and Baraffe et al. (2003) pre-main on veiling of r7510 =0.39 would yield M4.1 and AV = sequence tracks, the mass and age are 0.16 M⊙ and 6.5 −0.06. In these latter cases, the resulting red spectrum Myr, respectively, wheareas the M3 SpT yields 0.31 M⊙ looks reasonable. The uncertainties in SpT and veiling and 26 Myr. are about half the size of these ranges when using the blue and red spectra together. Even with the blue+red LkCa 4 (WTTS) Spotted High resolution optical, Donati+2014 Low-res red optical, Herczeg+2014 Age spreads of young cluster (see also Soderblom+2014) Observational uncertainties? Accretion histories? Real age spread Offsets between empirical and model isochrones lead to mass-dependent ages Baraffe+1998 isochrones mixing length 1.0 Herczeg & Hillenbrand 2015 New tracks fit much better! (Baraffe+2015; Feiden+ in prep) Baraffe+2015 isochrones Don’t age-date individual objects, but especially those at <3300 K (M3)! Still offsets at <3500 K; no assessment of >5000 K Consistent age estimates Upper Sco: young stars are 4 Myr Pecaut & Mamajek: intermediate/high mass stars are 11 Myr EmpiricalIsochronesforLowMassStars 13 TABLE 5 Consistent Sets of Ages (in Myr) Estimated from a Single ModelandTemperaturea Stellar DM97 Tognelli BCAH-1.0 Feiden BHAC-2015 Li Depl.b Association d (pc) log L4200/L⊙ 3400 K 4200 4200 K 3800 3800 Age Upper Sco 145 ± 10 −0.23 ± 0.06 1.6 ± 0.24.6 ± 1.19.7 ± 1.9 3.8 ± 1.03.8 ± 1.0 – ϵ Cha 111 ± 5 −0.28 ± 0.06 1.9 ± 0.35.6 ± 1.411.3 ± 2.1 4.7 ± 1.24.7 ± 1.2 – η Cha 94 ± 5 −0.32 ± 0.05 2.1 ± 0.36.6 ± 1.312.7 ± 2.1 5.5 ± 1.35.5 ± 1.3 – TWA (57) −0.40 ± 0.04 2.7 ± 0.49.0 ± 1.516.5 ± 2.1 7.9 ± 1.48.1 ± 1.4 – BPMG (30) −0.65 ± 0.04 6.1 ± 0.724± 436± 5 23 ± 422± 4 25 ± 4 Tuc Hor (51) −0.72 ± 0.02 7.7 ± 0.532± 344± 3 30 ± 329± 3 40 ± 4 aFor models that produce younger, intermediate, and older ages, and separately for the Feiden and BHAC-15 tracks. These sets of ages are calculated from a single model at a single Teff ,appliedconsistentlytoeachassociation. bLi depletion boundary ages, see text for details. improved match between predicted and observed stellar Figure 12 and Table 5 compares the Li depletion loci. boundary ages to the isochronal ages estimated here from Ultimately, some model improvements are necessary the different model tracks. For 3800 K stars, the Siess, so that the evolution of radius and temperature bet- Tognelli, Dotter, and BCAH-1.9, BHAC-2015, and Fei- ter reflects the observational constraints of young stellar den models predict ages that are roughly consistent with associations. One of these improvements, the inclusion the Li depletion boundary ages, within the uncertain- of magnetic fields in the Dartmouth models, provides a ties. Ages from PARSEC and BCAH-1.0 are too old and much better match to empirical isochrones. Age com- DM97 are too young, while Tognelli, Dotter, and BCAH parisons between clusters are accurate only when com- models at 3400 K yield ages that are too young. Apply- pared over specific temperature ranges where the model ing the DM97 models yield especially young ages, likely and empirical isochrones match. The magnetic Feiden because the isochrones of low-mass stars have tempera- models currently offer the best set of pre-main sequence tures that are initially too high (see description in §2.5). tracks for relative age estimates, although mismatches at Both the Feiden and BHAC-2015 models have similar < 3500 K still lead to temperature-dependent ages. The isochrones that yield remarkably similar ages. empirical isochrones derived in this paper offer a method When applied consistently, the Li depletion boundary to place stars of different temperatures on the same age ages for the Tuc-Hor and β Pic Moving Group imply a scale, albeit with some uncertainty introduced by the ∼ 5 Myr old age for low mass stars in the Upper Sco possible temporal evolution of the isochronal slopes. OB Association, younger than the 11 Myr age measured Table 5 lists sets ages for each cluster based on a con- from intermediate and high mass stars by Pecaut et al. sistent application of a single model family at a single (2012). The 11 Myr age of Upper Sco would require ages stellar temperature. The ages are selected from models of ∼ 40 and 55 Myr for the β Pic and Tuc-Hor Moving that produce young, intermediate, and old ages relative Groups. Either the intermediate mass or low mass age to the average model. Uncertainties in these ages are (based on Li depletion boundary ages of older associa- calculated from the statistical uncertainties in the fits, tions) of the Upper Sco OB Association is incorrect, or as listed in Table 48, and an estimate for the systematic the target selection of one of the samples is biased. uncertainty in the median distance of the η Cha, ϵ Cha, Errors in ages may be caused by either errors in the and Upper Sco OB Associations. birthline or in the contraction rates. A bulk subtraction The reasonableness of these isochronal ages are of 5 Myr to intermediate mass isochrones would shift the testable by comparison to Li depletion boundary ages9. intermediate mass isochrones sufficiently for Upper Sco The Tuc-Hor Moving Group has a Li depletion bound- and would not cause any significant discrepancy with the ary age of 41 ± 2 Myr from the BCAH-1.0 evolutionary Li depletion age of the β Pic Moving Group.
Load more

Recommended publications
  • Kathy Siyu Xue, Ph.D., MPH 120 Pine Bark Ln Athens, GA 30605 (706) 353-7609 [email protected]
    Kathy Siyu Xue, Ph.D., MPH 120 Pine Bark Ln Athens, GA 30605 (706) 353-7609 [email protected] EDUCATION Doctorate of Philosophy 2012-2017 Interdisciplinary Toxicology Program Athens, GA Department of Environmental Health Sciences University of Georgia Master of Public Health 2014-2017 University of Georgia Athens, GA Bachelor of Science 2008-2012 Cell and Molecular Biology Austin, TX University of Texas – Austin WORK EXPERIENCE 2017- present Postdoctoral Researcher, University of Georgia, Athens, GA. Mentor: Dr. Jia-Sheng Wang Jun. 2016 – Aug. 2016 Internship, United State Department of Agriculture Toxicology and Mycotoxin Research Unit, Athens, GA Site Supervisor: Dr. Kenneth Voss 2012-2017 Research Assistant, University of Georgia, Athens, GA. Advisor: Dr. Jia-Sheng Wang Aug.2013- Dec. 2013 Teaching Assistant, University of Georgia, Athens, GA. Taking roll, organizing student seminars, coordinating speakers Mar. 2012 – May 2012 Undergraduate Research Volunteer, Dr. Mueller Lab University of Texas – Austin, TX 2010 – 2012 Student Volunteer, Athens Regional Medical Center, Athens, GA 2010-2011 Student Research Assistant, University of Georgia – Athens, GA Dr. Jia-sheng Wang Lab Refill pipette tips, organize chemicals, shadowing research scientists. Additional work including culturing and toxicity testing for C elegans, assistance in oxidative damage biomarker analysis. 2004-2007 Student Volunteer, Texas Tech University – Lubbock, TX Dr. Jia-Sheng Wang Lab HONOR AND AWARDS 2017 Induction into Beta Chi Chapter of Delta Omega Honorary Society
    [Show full text]
  • The Significance and Inheritance of Huang Di Culture
    ISSN 1799-2591 Theory and Practice in Language Studies, Vol. 8, No. 12, pp. 1698-1703, December 2018 DOI: http://dx.doi.org/10.17507/tpls.0812.17 The Significance and Inheritance of Huang Di Culture Donghui Chen Henan Academy of Social Sciences, Zhengzhou, Henan, China Abstract—Huang Di culture is an important source of Chinese culture. It is not mechanical, still and solidified but melting, extensible, creative, pioneering and vigorous. It is the root of Chinese culture and a cultural system that keeps pace with the times. Its influence is enduring and universal. It has rich connotations including the “Root” Culture, the “Harmony” Culture, the “Golden Mean” Culture, the “Governance” Culture. All these have a great significance for the times and the realization of the Great Chinese Dream, therefore, it is necessary to combine the inheritance of Huang Di culture with its innovation, constantly absorb the fresh blood of the times with a confident, open and creative attitude, give Huang Di culture a rich connotation of the times, tap the factors in Huang Di culture that fit the development of the modern times to advance the progress of the country and society, and make Huang Di culture still full of vitality in the contemporary era. Index Terms—Huang Di, Huang Di culture, Chinese culture I. INTRODUCTION Huang Di, being considered the ancestor of all Han Chinese in Chinese mythology, is a legendary emperor and cultural hero. His victory in the war against Emperor Chi You is viewed as the establishment of the Han Chinese nationality. He has made great many accomplishments in agriculture, medicine, arithmetic, calendar, Chinese characters and arts, among which, his invention of the principles of Traditional Chinese medicine, Huang Di Nei Jing, has been seen as one of the greatest contributions to Chinese medicine.
    [Show full text]
  • Sun-Mi Kim 2015
    Adoption of Aspiration Feature in Sino-Korean Phonology Sun-Mi Kim A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Washington 2015 Reading Committee: Zev Handel, Chair Ellen Kaisse Soohee Kim Program Authorized to Offer Degree: Asian Languages and Literature ©Copyright 2015 Sun-Mi Kim Abstract Adoption of Aspiration Feature in Sino-Korean Phonology Sun-Mi Kim Chair of the Supervisory Committee: Professor Zev Handel Department of Asian Languages and Literature This dissertation examines the adoption of aspiration feature in Sino-Korean character readings. In broad usage, the term Sino-Korean refers to Chinese loanwords in Korean, but in this dissertation, it is used for a phonological system of Chinese-character readings (or pronunciation) derived from Middle Chinese. Although most sound correspondences between Sino-Korean and Middle Chinese are quite regular, some phonological features of Middle Chinese have been adopted irregularly into Sino-Korean, and Sino-Korean (SK) readings with aspiration discrepancy are part of this broader phenomenon of irregular SK readings. It is generally assumed that both the Chinese and Korean languages had voiceless aspirated stops and voiceless unaspirated stops at the time Chinese characters were adopted in the Korean peninsula. If that is indeed the case, a regular correspondence between Middle Chinese (MC) and SK is expected between the two languages. However, there are many cases where the aspiration feature shows irregular correspondence. Some SK readings with an unaspirated initial in their MC counterpart have an aspirated initial, while other SK readings with an aspirated initial in their MC counterpart have an unaspirated initial.
    [Show full text]
  • Male Names of Women and Female Names of Men in the Chinese Society Irena Kałużyńska
    ONOMÀSTICA BIBLIOTECA TÈCNICA DE POLÍTICA LINGÜÍSTICA Male Names of Women and Female Names of Men in the Chinese Society Irena Kałużyńska DOI: 10.2436/15.8040.01.81 Abstract The paper discusses some Chinese given names that apparently indicate the sex of their bearers. In China there have never been any strict linguistic rules concerning the gender-specific differentiation of given names, as the Chinese language does not have a grammatical gender, and the gender usually is a covert category. However, there is a group of given names strictly complying with the most common naming convention, i.e. that a name overtly indicates the sex of the person named. These are Chinese female given names with “female” terms written in characters with the graphical marker of “femininity”, and male names with typical “male” terms, especially general terms for men, terms of address, kinship and rank. In most cases the occurrence of such a term in a name indicates that the bearer of the name is a woman or a man. The cases of the inverse use of the terms reveal the additional significance of such formed names, as commendatory or counter-commendatory names. ***** Introduction The meaningfulness of names plays an important social and cultural role in the Chinese naming system. Given names are formed individually, and they are mostly semantically transparent. The approach to names, as being not only labels helpful in the identification of people but almost real or desired facts, has caused that through personal names the Chinese express their culture-oriented opinions and expectations. Gender stereotypes have had an enormous impact on various aspects of the family and social life, and they have also influenced personal naming.
    [Show full text]
  • Mobile Geo-Location Algorithm Based on LS-SVM SUN Guo-Lin, GUO
    Mobile Geo-location Algorithm based on LS-SVM SUN Guo-lin, GUO Wei (Institute of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China) Telephone Number: 86-28-83201410, Email: [email protected] Abstract: The mobile geo-location is a has been very successfully applied on many requirement driven by the emergency Calls, fields, such as handwriting recognition, face but also by the emergence of new location identification, signal processing and mobile based services and ubiquitous computing. In geo-location [4]. Recently, a new method of order to improve location accuracy, a novel SVMs, Least Squares Support Vector mobile positioning algorithm based on Machines (LS-SVMs) [5], which adopts LS-SVM algorithm is employed to fuse the least squares linear system as loss function, radiolocation TOA measurements of several instead of quadratic program in traditional base stations. Through simulation in the bad SVMs. It has been successfully applied to urban environment, an accuracy of 71m in pattern recognition and nonlinear function 67% of cases and 135m in 95% of cases has estimation problems, which performed well been reached, which satisfies FCC for its simple calculation, fast convergence requirements very well. and high precision. Therefore, this letter Keywords: Mobile geo-location, Least attempts to apply LS-SVMs to Mobile Squares Support vector machines, Data geolocation to satisfy FCC requirements fusion well. Introduction: Location based services in LS-SVMs for mobile ge-olocation: Here, we mobile phone systems have received simply introduce the algorithm of function increased attention now. The Geo-location estimation LS-SVMs: accuracy requirement set by the Phase 2 Dx= {(,y)|k=∈1,2,",N},xRn ,y∈R program of U.S.
    [Show full text]
  • Ms Sun Xueling Minister of State Ministry
    Ms Sun Xueling Minister of State Ministry of Education Ministry of Social and Family Development Member of Parliament Punggol West SMC REPUBLIC OF SINGAPORE Ms Sun Xueling was elected a Member of Parliament in September 2015. She currently holds the position of Minister of State in the Ministry of Education and the Ministry of Social and Family Development Ms Sun serves as a Board Member of the Chinese Development Assistance Council. After the 2015 General Election, Ms Sun was appointed CEO of Business China, a non-profit organization which aims to form a cultural and economic bridge linking the world and China. Business China was launched in 2007 by Mr Lee Kuan Yew, late founding Prime Minister of Singapore and then Premier Wen Jiabao of the People’s Republic of China. Before entering politics, Ms Sun spent more than a decade in the Private Sector in Finance and Investments. She was Director, Investments Group, at Temasek International, focusing on investment opportunities in China and other developing countries in Latin America. She had also spent 8 years based in Hong Kong and China working for Deutsche Bank AG as a Director and also as Senior Vice-President in Macquarie Securities. Ms Sun spent her early career at the Economic Development Board of Singapore and DBS Bank Ltd. She received her Master of Science in International Political Economy from the London School of Economics and Political Science, and also holds a Bachelor of Social Sciences in Economics from the National University of Singapore. Aug 2020 COPYRIGHT NOTICE Copyright @ The Government of Singapore.
    [Show full text]
  • English Versions of Chinese Authors' Names in Biomedical Journals
    Dialogue English Versions of Chinese Authors’ Names in Biomedical Journals: Observations and Recommendations The English language is widely used inter- In English transliteration, two-syllable Forms of Chinese Authors’ Names nationally for academic purposes. Most of given names sometimes are spelled as two in Biomedical Journals the world’s leading life-science journals are words (Jian Hua), sometimes as one word We recently reviewed forms of Chinese published in English. A growing number (Jianhua), and sometimes hyphenated authors’ names accompanying English- of Chinese biomedical journals publish (Jian-Hua). language articles or abstracts in various abstracts or full papers in this language. Occasionally Chinese surnames are Chinese and Western biomedical journals. We have studied how Chinese authors’ two syllables (for example, Ou-Yang, Mu- We found considerable inconsistency even names are presented in English in bio- Rong, Si-Ma, and Si-Tu). Editors who are within the same journal or issue. The forms medical journals. There is considerable relatively unfamiliar with Chinese names were in the following categories: inconsistency. This inconsistency causes may mistake these compound surnames for • Surname in all capital letters followed by confusion, for example, in distinguishing given names. hyphenated or closed-up given name, for surnames from given names and thus cit- China has 56 ethnic groups. Names example, ing names properly in reference lists. of minority group members can differ KE Zhi-Yong (Chinese Journal of In the current article we begin by pre- considerably from those of Hans, who Contemporary Pediatrics) senting as background some features of constitute most of the Chinese population. GUO Liang-Qian (Chinese Chinese names.
    [Show full text]
  • Huaqiang ZENG Team Leader and Principal Research Scientist
    Huaqiang ZENG Team Leader and Principal Research Scientist +65 6824 7115 [email protected] Team Leader and Principal Research Scientist, NanoBio Lab, Singapore, 2019-present Team Leader and Principal Research Scientist, Institute of Bioengineering and Nanotechnology, Singapore, 2014-2019 Assistant Professor, National University of Singapore, 2006-2013 Postdoctoral Research Fellow, The Scripps Research Institute, USA, 2002-2006 Ph.D. in Organic Chemistry, The State University of New York at Buffalo, USA, 2002 B.S. in Chemical Physics, The University of Science and Technology of China, 1996 Publications 1. A. Roy, H. Joshi, R. Ye, J. Shen, F. Chen, A. Aksimentiev and H. Zeng, “Polyhydrazide‐Based Organic Nanotubes as Efficient and Selective Artificial Iodide Channels,” Angewandte Chemie International Edition, 132 (2020) 4836-4843. IF 12.102 2. J. Shen, J. Fan, R. Ye, N. Li, Y. Mu and H. Zeng, “Polypyridine-Based Helical Amide Foldamer Channels for Rapid Transport of Water and Proton with High Ion Rejection,” Angewandte Chemie International Edition, (2020) DOI: 10.1002/anie.202003512. IF 12.257 3. J. Shen, R. Ye, A. Romanies, A. Roy, F. Chen, C. Ren, Z. Liu and H. Zeng, “An Aquafoldmer-Based Aquaporin-Like Synthetic Water Channel,” Journal of the American Chemical Society, 142 (2020) 10050-10058. IF 14.695 4. H. Zeng, A. Roy, H. Joshi, R. Ye, J. Shen, F. Chen and A. Aksimentiev, “Polyhydrazide-Based Organic Nanotubes as Extremely Efficient and Highly Selective Artificial Iodide Channels,” Angew. Chem. Int. Ed., (2020) DOI: 10.1002/anie.201916287 5. H. Zeng, F. Chen, J. Shen, N. Li, A.
    [Show full text]
  • Names of Chinese People in Singapore
    101 Lodz Papers in Pragmatics 7.1 (2011): 101-133 DOI: 10.2478/v10016-011-0005-6 Lee Cher Leng Department of Chinese Studies, National University of Singapore ETHNOGRAPHY OF SINGAPORE CHINESE NAMES: RACE, RELIGION, AND REPRESENTATION Abstract Singapore Chinese is part of the Chinese Diaspora.This research shows how Singapore Chinese names reflect the Chinese naming tradition of surnames and generation names, as well as Straits Chinese influence. The names also reflect the beliefs and religion of Singapore Chinese. More significantly, a change of identity and representation is reflected in the names of earlier settlers and Singapore Chinese today. This paper aims to show the general naming traditions of Chinese in Singapore as well as a change in ideology and trends due to globalization. Keywords Singapore, Chinese, names, identity, beliefs, globalization. 1. Introduction When parents choose a name for a child, the name necessarily reflects their thoughts and aspirations with regards to the child. These thoughts and aspirations are shaped by the historical, social, cultural or spiritual setting of the time and place they are living in whether or not they are aware of them. Thus, the study of names is an important window through which one could view how these parents prefer their children to be perceived by society at large, according to the identities, roles, values, hierarchies or expectations constructed within a social space. Goodenough explains this culturally driven context of names and naming practices: Department of Chinese Studies, National University of Singapore The Shaw Foundation Building, Block AS7, Level 5 5 Arts Link, Singapore 117570 e-mail: [email protected] 102 Lee Cher Leng Ethnography of Singapore Chinese Names: Race, Religion, and Representation Different naming and address customs necessarily select different things about the self for communication and consequent emphasis.
    [Show full text]
  • Zhenzhong Zeng School of Environmental Science And
    Zhenzhong Zeng School of Environmental Science and Engineering, Southern University of Science and Technology [email protected] | https://scholar.google.com/citations?user=GsM4YKQAAAAJ&hl=en CURRENT POSITION Associate Professor, Southern University of Science and Technology, since 2019.09.04 PROFESSIONAL EXPERIENCE Postdoctoral Research Associate, Princeton University, 2016-2019 (Mentor: Dr. Eric F. Wood) EDUCATION Ph.D. in Physical Geography, Peking University, 2011-2016 (Supervisor: Dr. Shilong Piao) B.S. in Geography Science, Sun Yat-Sen University, 2007-2011 RESEARCH INTERESTS Global change and the earth system Biosphere-atmosphere interactions Terrestrial hydrology Water and agriculture resources Climate change and its impacts, with a focus on China and the tropics AWARDS & HONORS 2019 Shenzhen High Level Professionals – National Leading Talents 2018 “China Agricultural Science Major Progress” - Impacts of climate warming on global crop yields and feedbacks of vegetation growth change on global climate, Chinese Academy of Agricultural Sciences 2016 Outstanding Graduate of Peking University 2013 – 2016 Presidential (Peking University) Scholarship; 2014 – 2015 Peking University PhD Projects Award; 2013 – 2014 Peking University "Innovation Award"; 2013 – 2014 National Scholarship; 2012 – 2013 Guanghua Scholarship; 2011 – 2012 National Scholarship; 2011 – 2012 Founder Scholarship 2011 Outstanding Graduate of Sun Yat-Sen University 2009 National Undergraduate Mathematical Contest in Modeling (Provincial Award); 2009 – 2010 National Scholarship; 2008 – 2009 National Scholarship; 2007 – 2008 Guanghua Scholarship PUBLICATION LIST 1. Liu, X., Huang, Y., Xu, X., Li, X., Li, X.*, Ciais, P., Lin, P., Gong, K., Ziegler, A. D., Chen, A., Gong, P., Chen, J., Hu, G., Chen, Y., Wang, S., Wu, Q., Huang, K., Estes, L. & Zeng, Z.* High spatiotemporal resolution mapping of global urban change from 1985 to 2015.
    [Show full text]
  • Curriculum Vitae of Dr
    Curriculum Vitae of Dr. Deyin Guo Name: Deyin Guo Gender： Male Date of Birth: April 26, 1965 Place of Birth: Xiayi, Henan Province, PR China Address: School of Medicine Sun Yat-sen University, North Campus (Medical Campus), Zhongshan Erlu 74, Yuexiu District, Guangzhou 510080, P.R. China Phone: Work: +86-20-38882405; Mobile Phone: +86-13296609699 E-mail: E-mail: [email protected] or [email protected] Education: Feb. 1992- Aug 1995 PhD in natural sciences (Dr. rer. nat) (major in Microbiology) Braunschweig University of Technology, Germany. Sept 1985- Jul 1988 M.S. in Microbiology Graduate School, Chinese Academy of Agricultural Sciences and the Institute of Microbiology, Chinese Academy of Sciences, Beijing Sept 1981 -July 1985 Bachelor Degree, Nanjing Agricultural University, Nanjing, China Professional Experience: Aug. 2016 – now Professor and dean of the School of Medicine, Sun Yat-sen University, China; Jan. 2011 – Oct. 2016 Professor and dean of the School of Basic Medical Sciences, Wuhan University, China; Jun 2002 – Oct 2016 Acting director / director of Modern Virology Research Center, Wuhan University, China. Apr 2005 – Oct 2016 Founding member and associate director of the National Key Laboratory of Virology, Wuhan, China. Jun 2002 – Jun 2011 Professor and Vice-Dean of the College of Life Sciences, Wuhan University, China. Jan. 1996 – Sept 2002 Postdoc fellow (1996-2001) and docent (2001) at the Institute of Biotechnology, University of Helsinki, Finland. Working with Prof. Mart Saarma. Mar. 1992 – Oct 1995 Research scientist and PhD student (in Microbiology with Prof. HJ Aust) at the Department of Microbiology, Braunschweig University of Technology, Germany and the Institute of Biochemistry and Plant Virology (with Prof.
    [Show full text]
  • A Comparison of the Korean and Japanese Approaches to Foreign Family Names
    15 A Comparison of the Korean and Japanese Approaches to Foreign Family Names JIN Guanglin* Abstract There are many foreign family names in Korean and Japanese genealogies. This paper is especially focused on the fact that out of approximately 280 Korean family names, roughly half are of foreign origin, and that out of those foreign family names, the majority trace their beginnings to China. In Japan, the Newly Edited Register of Family Names (新撰姓氏錄), published in 815, records that out of 1,182 aristocratic clans in the capital and its surroundings, 326 clans—approximately one-third—originated from China and Korea. Does the prevalence of foreign family names reflect migration from China to Korea, and from China and Korea to Japan? Or is it perhaps a result of Korean Sinophilia (慕華思想) and Japanese admiration for Korean and Chinese cultures? Or could there be an entirely distinct explanation? First I discuss premodern Korean and ancient Japanese foreign family names, and then I examine the formation and characteristics of these family names. Next I analyze how migration from China to Korea, as well as from China and Korea to Japan, occurred in their historical contexts. Through these studies, I derive answers to the above-mentioned questions. Key words: family names (surnames), Chinese-style family names, cultural diffusion and adoption, migration, Sinophilia in traditional Korea and Japan 1 Foreign Family Names in Premodern Korea The precise number of Korean family names varies by record. The Geography Annals of King Sejong (世宗實錄地理志, 1454), the first systematic register of Korean family names, records 265 family names, but the Survey of the Geography of Korea (東國輿地勝覽, 1486) records 277.
    [Show full text]