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Molecular Oxygen Abundance in Galactic Massive Star Formation Regions Based on SWAS Observations

Research in Astronomy and Astrophysics 2024年第9期24卷 85-100页

作者： Bing-Ru Wang Di Li Paul F.Goldsmith Jingwen Wu Chao-Wei Tsai Donghui Quan Xia Zhang Junzhi Wang gary J.Melnick Jin-Zeng Li gary a.fuller Jinjin Xie National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences Tsinghua University Research Center for Astronomical Computing Zhejiang Laboratory Jet Propulsion Laboratory California Institute of Technology Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Xinjiang Astronomical Observatory Chinese Academy of Sciences Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi University Center for Astrophysics Harvard&Smithsonian60 Garden Street Jodrell Bank Center for Astrophysics Department of Physics&AstronomyUniversity of Manchester I.Physikalisches Institut University of Cologne

Molecular oxygen abundance is a key parameter in understanding the chemical network of the interstellar *** estimate the molecular oxygen column density and abundance for a sample of Galactic massive star formation regions based on observations from the Submillimiter Wave Astronomy Satellite （SWAS） *** obtained an averaged O2spectrum based on this sample using the （SWAS） survey data （O2,487.249 GHz,N=3–1,J=3–2）.No emission or absorption feature is seen around the supposed central velocity with a total integration time of ttotal=8.67×10～3hr and an rms noise per channel of 1.45 m *** a kinetic temperature Tkin=30 K,we derive the 3σupper limit of the O2column density to be 3.3×1015cm-2,close to the lowest values reported in Galactic massive star formation regions in previous *** corresponding O2abundance upper limit is6.7×10-8,lower than all previous results based on SWAS observations and is close to the lowest reported value in massive star formation *** a galactic scale,our statistical results confirm a generally low O2abundance for Galactic massive star formation *** abundance is also lower than results reported in extragalactic sources.

关键词： ISM: molecules galaxies: abundances ISM: lines and bands Galaxy: abundances HERSCHEL HIFI OBSERVATIONS CARBON-MONOXIDE ABUNDANCE WAVE-ASTRONOMY-SATELLITE ODIN OBSERVATIONS THERMAL BALANCE UPPER LIMITS CLOUD CORES INTERSTELLAR O-2 SEARCH

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The Distribution of UV Radiation Field in the Molecular Clouds of Gould Belt

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Research in Astronomy and Astrophysics 2022年第8期22卷 206-217页

作者： Jifeng Xia Ningyu Tang Qijun Zhi Sihan Jiao Jinjin Xie gary a.fuller Paul F.Goldsmith Di Li School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Physics Anhui Normal UniversityWuhu 241002China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang 550001China Shanghai Astronomical Observatory CASShanghai 200030China Jodrell Bank Centre for Astrophysics Department of Physics&AstronomyThe University of ManchesterManchester M139PLUnited Kingdom I.Physikalisches Institut University of CologneZülpicher Str.77D-50937 KölnGermany Jet Propulsion Laboratory California Institute of Technology4800 Oak Grove DrivePasadenaCA 91109United States of America

The distribution of ultraviolet(UV)radiation field provides critical constraints on the physical environments of molecular *** 1 kpc of our solar system and fostering protostars of different masses,the giant molecular clouds in the Gould Belt present an excellent opportunity to resolve the UV field structure in star-forming *** performed spectral energy distribution(SED)fitting of the archival data from the Herschel Gould Belt Survey(HGBS).Dust radiative transfer analysis with the DUSTY code was applied to 23 regions in 14 molecular complexes of the Gould Belt,resulting in the spatial distribution of the radiation field in these *** 10 of 15 regions with independent measurements of star formation rate,their star formation rate and UV radiation intensity largely conform to a linear correlation found in previous studies.

关键词： ISM:clouds (ISM:)dust extinction radiative transfer

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The TMRT K band observations towards 26 infrared dark clouds:NH_3, CCS, and HC_3N

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Science China(Physics,Mechanics & Astronomy) 2021年第7期64卷 126-136页

作者： Jinjin Xie gary a.fuller Di Li Longfei Chen Zhiyuan Ren Jingwen Wu Yan Duan Junzhi Wang Juan Li Nicolas Peretto Tie Liu Zhiqiang Shen National Astronomical Observatories Chinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China Jodrell Bank Centre for Astrophysics Department of Physics and AstronomyUniversity of ManchesterManchesterM139PLUK Intituto de Astrofísica de Andalucia(CSIC) Granada18008Spain I.Physikalisches Institute University of CologneKöln50937Germany NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban4000South Africa Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai200030China School of Physics&Astronomy Cardiff UniversityCardiffCF243AAUnited Kingdom

We present one of the first Shanghai Tian Ma Radio Telescope (TMRT) K Band observations towards a sample of 26 infrared dark clouds (IRDCs).We observed the (1,1),(2,2),(3,3),and (4,4) transitions of NH_(3) together with CCS (2_(1)–>1_(0)) and HC_(3)NJ=2-1,*** survey dramatically increases the existing CCS-detected IRDC sample from 8 to 23,enabling a better statistical study of the ratios of carbon-chain molecules (CCM) to N-bearing molecules in *** the newly developed hyperfine group ratio (HFGR) method of fitting NH_(3) inversion lines,we found the gas temperature to be between 10 and18 *** column density ratios of CCS to NH_(3) for most of the IRDCs are less than 10^(-2),distinguishing IRDCs from low-mass star-forming *** carried out chemical evolution simulations based on a three-phase chemical model *** measurements of the column density ratios between CCM and NH_(3) are consistent with chemical evolutionary ages of 10^(5) yr in the *** of the data and chemical models suggest that CCS,HC_(3)N,and NH_(3) are sensitive to the chemical evolutionary stages of the sources.

关键词： star formation infrared dark clouds chemical evolution

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Studying infall in infrared dark clouds with multiple HCO transitions

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Research in Astronomy and Astrophysics 2021年第8期21卷 253-268页

作者： Jin-Jin Xie Jing-Wen Wu gary a.fuller Nicolas Peretto Zhi-Yuan Ren Long-Fei Chen Yao-Ting Yan Guo-Dong Li Yan Duan Ji-Feng Xia Yong-Xiong Wang Di Li National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Jodrell Bank Centre for Astrophysics Department of Physics&AstronomyThe University of ManchesterManchester M139PLUnited Kingdom I.Physikalisches Institut University of CologneZlilpicher Str.7750937 KolnGermany NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa School of Physics&Astronomy Cardiff UniversityQueen's BuildingThe ParadeCardiffCF243AAUnited Kingdom Max-Planck-Institut fur Radioastronomie Auf dem Hiigel 6953121 BonnGermany

We investigate the infall properties in a sample of 11 infrared dark clouds(IRDCs) showing blue-asymmetry signatures in HCO^(+)J=1-0 line *** used JCMT to conduct mapping observations in HCO^(+)J=4-3 as well as single-point observations in HCO+J=3-2,towards 23 clumps in these *** applied the HILL model to fit these observations and derived infall velocities in the range of 0.5-2.7 km s^(-1),with a median value of 1.0 km s^(-1),and obtained mass accretion rates of 0.5-14 ×10^(-3) Mo yr^(-1).These values are comparable to those found in massive star forming clumps in later evolutionary *** IRDC clumps are more likely to form star ***^(+)J=3-2 and HCO^(+)J=1-0 were shown to trace infall signatures well in these IRDCs with comparable inferred ***^(+)J=4-3,on the other hand,exhibits infall signatures only in a few very massive clumps,due to smaller *** obvious correlation for these clumps was found between infall velocity and the NH3/CCS ratio.

关键词： stars:formation ISM:clouds star formation:kinematics and dynamics

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Studying infall in infrared dark clouds with multiple HCO+ transitions

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Research in Astronomy and Astrophysics 2021年第8期 255-270页

作者：谢津津吴京文 gary a.fuller Nicolas Peretto 任致远陈龙飞闫耀庭李国栋段言夏季风王永雄李菂 National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences Jodrell Bank Centre for Astrophysics Department of Physics & Astronomy The University of Manchester I.Physikalisches Institut University of Cologne School of Physics & Astronomy Cardiff University Max-Planck-Institut für Radioastronomie NAOC-UKZN Computational Astrophysics Centre University of Kwa Zulu-Natal

We investigate the infall properties in a sample of 11 infrared dark clouds（IRDCs） showing blue-asymmetry signatures in HCO+J=1-0 line *** used JCMT to conduct mapping observations in HCO+J=4-3 as well as single-point observations in HCO+J=3-2,towards 23 clumps in these *** applied the HILL model to fit these observations and derived infall velocities in the range of 0.5-2.7 km s-1,with a median value of 1.0 km s-1,and obtained mass accretion rates of 0.5-14 ×10-3Mo *** values are comparable to those found in massive star forming clumps in later evolutionary *** IRDC clumps are more likely to form star ***+J=3-2 and HCO+J=1-0 were shown to trace infall signatures well in these IRDCs with comparable inferred ***+J=4-3,on the other hand,exhibits infall signatures only in a few very massive clumps,due to smaller *** obvious correlation for these clumps was found between infall velocity and the NH3/CCS ratio.

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Triassic integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1152-1194页

作者： Guichun WU Zhansheng JI gary GLASH Qinggao ZENG Jianxin YAO Key Laboratory of Stratigraphy and Palaeontology Ministry of Natural ResourcesInstitute of GeologyChinese Academy of Geological SciencesBeijing 100037China SinoProbe Laboratory Chinese Academy of Geological SciencesBeijing 100094China Department of Geology and Environmental Sciences State University of New York-FredoniaFredoniaNY 14063USA Xizang Autonomous Region Geological and Mineral Exploration and Development Burea Lhasa 850010China

Rocks of the Qinghai-Tibetan Plateau(QTP)host abundant Triassic *** far,the well established marine fossil sequences based on ammonoids,conodonts,bivalves,brachiopods,radiolarians,and terrestrial spora-pollen sequence have become standard for biostratigraphic correlation of the *** much of Triassic time,the QTP occupied a marine setting as suggested by the dominance of marine *** main sedimentary types represented in the Triassic successions include littoral to shallow marine clastic rocks,shallow marine carbonate platform carbonates,bathyal to abyssal slope carbonates intercalated with clastic and siliceous deposits,coal-bearing clastic strata contained within paralic facies deposits,and littoral and terrestrial volcaniclastic *** deposits are organized into four stages in ascending order:(1)Early Triassic deposits that record marine transgression,including extensive shallow marine carbonate platform strata.(2)Middle Triassic Ladinian to Late Triassic Carnian deposits,including thin-bedded limestone,fine clastics,and siliceous rocks,that accumulated at greater depths than underlying Early Triassic strata and reflect the peak of the *** activity appears to have occurred in some areas during this stage.(3)Late Triassic Norian deposits that record the onset of marine regression as suggested by the widespread occurrence of platform *** is noteworthy that stage 3 deposits of the Qin-Qi-Kun area in the northernmost region of the QPT is dominated by terrestrial strata and displays evidence of local erosion.(4)Late Triassic Rhaetian littoral and shallow marine clastic and coal-bearing deposits that preserve the record of continued marine regression *** Indus-Yarlungzangbo Suture Zone(IYSZ)appears to have been the rifting axis during Triassic time as suggested by sedimentary facies trends that reflect deepening to south and ***,the Himalaya Block to the south of the IYSZ was part of the passive margin

关键词： Qinghai-Tibetan Plateau Triassic Biostratigraphy Lithostratigraphy Palaeobiogeography Sedimentary palaeogeography

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Application of a simplified ADM1 for full-scale anaerobic co-digestion of cattle slurry and grass silage:assessment of input variability

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Frontiers of Environmental Science & Engineering 2024年第4期18卷 125-139页

作者： Sofia Tisocco Sören Weinrich gary Lyons Michael Wills Xinmin Zhan Paul Crosson Civil Engineering College of Science and EngineeringUniversity of GalwayGalwayH91 TK33Ireland Teagasc Animal and Bioscience Research Department Animal and Grassland Research and Innovation CentreDunsanyC15 PW93Ireland Biochemical Conversion Department Deutsches Biomasseforschungszentrum gemeinnützige GmbHLeipzig 04347Germany Faculty of Energy·Building Services·Environmental Engineering Münster University of Applied SciencesSteinfurt 48565Germany Agri-Food and Biosciences Institute HillsboroughBT266DRUK Ryan Institute University of GalwayGalwayH91 TK33Ireland MaREI Research Centre for Energy Climate and MarineRyan InstituteUniversity of GalwayGalwayH91 TK33Ireland

Mathematical modeling of anaerobic digestion is a powerful tool to predict gas yields and optimize the *** Anaerobic Digestion Model No.1(ADM1)is a widely implemented model for this ***,modeling full-scale biogas plants is challenging due to the extensive substrate and parameter characterization *** study describes the modification of the ADM1 through a simplification of individual process phases,characteristic components and required ***,the ability of the simplified model to simulate the co-digestion of grass silage and cattle slurry was evaluated using data from a full-scale biogas *** impacts of substrate composition(crude carbohydrate,protein and lipid concentration)and variability of carbohydrate degradability on simulation results were assessed to identify the most influential *** indicated that the simplified version was able to depict biogas and biomethane production with average model efficiencies,according to the Nash-Sutcliffe efficiency(NSE)coefficient,of 0.70 and 0.67,respectively,and was comparable to the original ADM1(average model efficiencies of 0.71 and 0.63,respectively).The variability of crude carbohydrate,protein and lipid concentration did not significantly impact biogas and biomethane output for the data sets *** contrast,carbohydrate degradability seemed to explain much more of the variability in the biogas and methane ***,the application of simplified models provides a reliable basis for the process simulation and optimization of full-scale agricultural biogas plants.

关键词： ADM1 Agricultural feedstocks Biogas technology Input variability Parameter estimation

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Revolutionizing plasmonic platform via magnetic field-assisted confined ultrafast laser deposition of high-density,uniform,and ultrafine nanoparticle arrays

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International Journal of Extreme Manufacturing 2024年第3期6卷 428-438页

作者： Jin Xu Lingfeng Wang Peilin Yang Haoqing Jiang Huai Zheng Licong An Xingtao Liu gary J Cheng School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906United States of America Institute of Technological Sciences Wuhan UniversityWuhanHubei 430072People’s Republic of China

The remarkable capabilities of 2D plasmonic surfaces in controlling optical waves havegarnered significant ***,the challenge of large-scale manufacturing of uniform,well-aligned,and tunable plasmonic surfaces has hindered their *** address this,we present a groundbreaking tunable plasmonic platform design achieved throughmagnetic field(MF)assisted ultrafast laser direct deposition in *** precise control of metal nanoparticles(NPs),with cobalt(Co)serving as the model material,employing an MF,and fine-tuning ultrafast laser parameters,we have effectively converted coarse and non-uniform NPs into densely packed,uniform,and ultrafine NPs(~3 nm).This revolutionary advancement results in the creation of customizable plasmonic‘hot spots,’which play a pivotal role insurface-enhanced Raman spectroscopy(SERS)*** profound impact of this designable plasmonic platform lies in its close association with plasmonic resonance and *** the plasmonic nanostructures resonate with incident light,they generate intense local electromagnetic fields,thus vastly increasing the Raman scattering *** enhancement leads to an outstanding 2–18 fold boost in SERS performance and unparalleled sensing sensitivity down to 10^(-10)***,the plasmonic platform also demonstratesrobustness,retaining its sensing capability even after undergoing 50 cycles of rinsing andre-loading of ***,this work adheres to green manufacturing standards,making it an efficient and environmentally friendly method for customizing plasmonic‘hot spots’inSERS *** study not only achieves the formation of high-density,uniform,and ultrafine NP arrays on a tunable plasmonic platform but also showcases the profound relation betweenplasmonic resonance and energy *** outstanding results observed in SERS sensors further emphasize the immense potential of this technology for energy-relatedapplications,including photocatalysis,ph

关键词： magnetic field manipulation laser deposition metasurface SERS

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Leflunomide: A versatile additive for defect reduction, enhanced optoelectronic properties and environmental stability of perovskite films

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Nano Research 2024年第4期17卷 2628-2637页

作者： Dingyue Sun Ming Peng Taijin Wang Longju Yi Shizuo Zhang Feng Liu gary J.Cheng The Institute of Technological Sciences Wuhan UniversityWuhan 430072China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Industrial Engineering Purdue UniversityWest LafayetteIN 47906USA

The development of perovskite photoelectric devices with excellent performance is largely dependent on the defects in the perovskite *** address this issue,a specific drug,leflunomide(LF,C_(12)H_(9)F_(3)N_(2)O_(2)),was incorporated into the perovskite to reduce defects and improve its photoelectric *** is believed that the C=O bond on LF molecule can interact with the uncoordinated Pb2+of the perovskite,thereby reducing non-radiative *** novel approach of incorporating LF into perovskite films has the potential to revolutionize the development of high-performance perovskite photoelectric *** trifluoromethyl functional(–CF_(3))group on LF can form a protective layer on the surface of the perovskite film,shielding it from water ***,LF can be utilized to alter the nucleation position of perovskite,thus minimizing the number of defects and optimizing the film ***,the LF-doped perovskite film displays low trap density and high photoelectric *** LF-doped perovskite film showed a trap density of 8.28×10^(11),which is notably lower than the 2.04×10^(12) of the perovskite film without *** responsivity and detectivity of the LF-doped perovskite photodetector were 0.771 A/W and 2.81×10^(11) Jones,respectively,which are much higher than the 0.23 A/W and 1.06×10^(10) Jones of the LF-undoped perovskite ***,the LF-doped photodetector maintained an initial photocurrent of 86%after 30 days of storage in air,indicating drastically increased environmental *** strongly suggests that LF is an effective additive for perovskites utilized in optoelectronic devices with high performance.

关键词： leflunomide additive engineering defect passivation perovskite

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New insights into nitric oxide biosynthesis underpin lateral root development

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Molecular Plant 2024年第5期17卷 691-693页

作者： Kapuganti Jagadis Gupta Nidhi Yadav Aprajita Kumari gary J.Loake National Institute for Plant Genome Research Aruna Asaf Ali MargNew Delhi 110070India Institute of Molecular Plant Sciences School of Biological SciencesUniversity of EdinburghEH93BF EdinburghUK Centre for Engineering Biology School of Biological SciencesUniversity of EdinburghEH93BF EdinburghUK

In recent years,nitric oxide(NO)has emerged as a key redox signaling molecule in plants functioning in the regulation of key developmental programs and the orchestration of responses to a plethora of environmental cues(Kolbert et al.,2019).The predominant route for the transfer of NO bioactivity is through S-nitrosylation,the addition of an NO moiety to a protein cysteine thiol to form an S-nitrosothiol(Yun et al.,2011).Specificity for this process is established by the structural constraints imposed by tertiary protein structure in gating access to given cysteine redox switches and associated proteins that can either facilitate the addition or removal of the NO moiety at these residues(Umbreen et al.,2018).

关键词： moiety addition redox

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