Kai Yang
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View article: ALMA observations of massive clouds in the central molecular zone: slim filaments tracing parsec-scale shocks
ALMA observations of massive clouds in the central molecular zone: slim filaments tracing parsec-scale shocks Open
The central molecular zone (CMZ) of our Galaxy exhibits widespread emission from SiO and various complex organic molecules (COMs), yet the exact origin of such emission is uncertain. Here we report the discovery of a unique class of long (…
View article: 5 cm OH Masers in Northern Star Formation Regions
5 cm OH Masers in Northern Star Formation Regions Open
We present a 6.0 GHz excited-state OH maser survey toward 155 northern star formation regions utilizing the Shanghai Tianma Radio Telescope. In total, we detect 44 6.0 GHz OH masers, 8 of which are new detections (one at 6016 MHz, two at 6…
View article: Structure–Activity Mechanism of Sodium Ion Adsorption and Release Behaviors in Biochar
Structure–Activity Mechanism of Sodium Ion Adsorption and Release Behaviors in Biochar Open
Biochar is a soil amendment that has the potential to effectively improve soil salinization. However, there is a paucity of studies on sodium adsorption using biochar, and the adsorption mechanism remains unclear. To better understand the …
View article: Molecular Deuterations in Massive Starless Clump Candidates
Molecular Deuterations in Massive Starless Clump Candidates Open
Deuterated molecules are valuable probes for investigating the evolution and the kinematics in the earliest stages of star formation. In this study, we conduct a comprehensive investigation by performing a single-point survey of 101 starle…
View article: Fine-mappingg and validation of the major quantitative trait locus QFlANG‑4B for flag leaf angle in wheat
Fine-mappingg and validation of the major quantitative trait locus QFlANG‑4B for flag leaf angle in wheat Open
Flag leaf angle (FLANG) is closely related to crop architecture and yield. We previously identified the quantitative trait locus (QTL) QFLANG-4B for FLANG on chromosome 4B, located within a 14-cM interval flanked by the markers Xbarc20 and…
View article: Surveys of clumps, cores, and condensations in Cygnus-X:Searching for circumstellar disks
Surveys of clumps, cores, and condensations in Cygnus-X:Searching for circumstellar disks Open
To investigate whether disk-mediated accretion is the primary mechanism in high-mass star formation, we have established a survey of a large sample of massive dense cores within a giant molecular cloud. We used high angular resolution ($\s…
View article: Molecular deuterations in massive Starless Clump Candidates
Molecular deuterations in massive Starless Clump Candidates Open
Deuterated molecules are valuable probes for investigating the evolution and the kinematics in the earliest stages of star formation. In this study, we conduct a comprehensive investigation by performing a single point survey of 101 starle…
View article: Surveys of clumps, cores, and condensations in Cygnus-X
Surveys of clumps, cores, and condensations in Cygnus-X Open
Context. Theories and models have suggested that circumstellar disks could channel material to the central protostar, and resist star formation feedback. Our current knowledge of the picture and role of disks around massive protostars is u…
View article: Surveys of clumps, cores, and condensations in Cygnus-X: SMA observations of SiO (5$-$4)
Surveys of clumps, cores, and condensations in Cygnus-X: SMA observations of SiO (5$-$4) Open
The SiO emissions are usually used to trace high-velocity outflow shocks in star-forming regions. However, several studies have found low-velocity and widespread SiO emissions not associated with outflows in molecular clouds. We aim to det…
View article: Surveys of clumps, cores, and condensations in Cygnus-X
Surveys of clumps, cores, and condensations in Cygnus-X Open
Context . The SiO emissions are usually used to trace high-velocity outflow shocks in star-forming regions. However, several studies have found low-velocity and widespread SiO emissions not associated with outflows in molecular clouds. Aim…
View article: Spatial distribution of NH2D in massive star-forming regions
Spatial distribution of NH2D in massive star-forming regions Open
To understand the relation between NH2D and its physical environment, we mapped ortho-NH2D $1_{11}^s-1_{01}^a$ at 85.9 GHz toward 24 Galactic late-stage massive star-forming regions with Institut de Radioastronomie Millim${\rm \acute{e}}$t…
View article: Easily Pyrolyzable Biomass Components Significantly Affect the Physicochemical Properties and Water-Holding Capacity of the Pyrolyzed Biochar
Easily Pyrolyzable Biomass Components Significantly Affect the Physicochemical Properties and Water-Holding Capacity of the Pyrolyzed Biochar Open
The influences of feedstocks on biochar properties are widely reported. However, the influence of the transformation of biomass components (mainly cellulose, hemicellulose, and lignin) during feedstock pyrolysis on the obtained biochar has…
View article: Imaging Molecular Outflow in Massive Star-forming Regions with HNCO Lines
Imaging Molecular Outflow in Massive Star-forming Regions with HNCO Lines Open
Protostellar outflows are considered a signpost of star formation. These outflows can cause shocks in the molecular gas and are typically traced by the line wings of certain molecules. HNCO (4–3) has been regarded as a shock tracer because…
View article: Imaging Molecular Outflow in Massive Star-forming Regions with HNCO Lines
Imaging Molecular Outflow in Massive Star-forming Regions with HNCO Lines Open
Protostellar outflows are considered a signpost of star formation. These outflows can cause shocks in the molecular gas and are typically traced by the line wings of certain molecules. HNCO (4--3) has been regarded as a shock tracer becaus…
View article: Sample and Statistical Analysis of the Near-Earth Object Wide-field Infrared Survey Explorer Variability of the 6.7 GHz Methanol Maser Sources
Sample and Statistical Analysis of the Near-Earth Object Wide-field Infrared Survey Explorer Variability of the 6.7 GHz Methanol Maser Sources Open
We present a statistical study of infrared variability using the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) database for a sample consisting of 1085 high-mass young stellar objects (YSOs) related to 6.7 GHz methanol ma…
View article: Direct measurements of carbon and sulfur isotope ratios in the Milky Way
Direct measurements of carbon and sulfur isotope ratios in the Milky Way Open
Context. Isotope abundance ratios provide a powerful tool for tracing stellar nucleosynthesis, evaluating the composition of stellar ejecta, and constraining the chemical evolution of the Milky Way. Aims. We aim to measure the 12 C/ 13 C, …
View article: Electric-field-driven spin resonance by on-surface exchange coupling to a single-atom magnet
Electric-field-driven spin resonance by on-surface exchange coupling to a single-atom magnet Open
Coherent control of individual atomic and molecular spins on surfaces has recently been demonstrated by using electron spin resonance (ESR) in a scanning tunneling microscope (STM). Here we present a combined experimental and modeling stud…
View article: Observed Rate Variation in Superflaring G-type Stars
Observed Rate Variation in Superflaring G-type Stars Open
Flare occurrence on the Sun is highly variable, exhibiting both short term variation due to the emergence and evolution of active regions, and long-term variation from the solar cycle. On solar-like stars, much larger stellar flares (super…
View article: Observation of Floquet topological phases with large Chern numbers
Observation of Floquet topological phases with large Chern numbers Open
One of the most intriguing advantage of Floquet engineering is to generate new phases with large topological invariants. In this work, we experimentally simulate a periodically quenched generalized Haldane model on an NV center in diamond,…
View article: An Excited-state OH Maser Survey toward WISE Point Sources
An Excited-state OH Maser Survey toward WISE Point Sources Open
We report a survey of excited-state hydroxyl (ex-OH) masers at the 4.7 and 6.0 GHz transitions toward a sample consisting of 3348 massive star-forming region candidates selected from the all-sky Wide-field Infrared Survey Explorer point-so…
View article: 6 cm OH Masers in Northern Star Formation Regions
6 cm OH Masers in Northern Star Formation Regions Open
We have used the Shanghai Tianma Radio Telescope to search for three OH transitions at 4.7 GHz toward 155 northern star formation regions. We detect 4.7 GHz OH masers in 18 star formation regions, 8 of which are reported here for the first…
View article: Discovery of ammonia (9,6) masers in two high-mass star-forming regions
Discovery of ammonia (9,6) masers in two high-mass star-forming regions Open
Context. Molecular maser lines are signposts of high-mass star formation, probing the excitation and kinematics of very compact regions in the close environment of young stellar objects and providing useful targets for trigonometric parall…
View article: Method of compensating for time measurement error of photomultiplier tube
Method of compensating for time measurement error of photomultiplier tube Open
In order to improve the temporal resolution of photomultiplier tubes, our research group has conducted the in-depth research on photomultiplier tubes based on microchannel plates that are widely used at present. The time resolution of phot…
View article: A 12.2 GHz Methanol Maser Survey toward the 6.7 GHz Counterparts Associated with/without UC H ii Regions
A 12.2 GHz Methanol Maser Survey toward the 6.7 GHz Counterparts Associated with/without UC H ii Regions Open
We report a new survey of the 12.2 GHz Class II methanol masers toward a sample of 367 sources with the 6.7 GHz methanol masers conducted with the Shanghai 65 m Tianma Radio Telescope. This sample has been previously made with observations…
View article: WATER VAPOR NEAR-UV ABSORPTION: LABORATORY SPECTRUM, FIELD EVIDENCE, AND ATMOSPHERIC IMPACTS
WATER VAPOR NEAR-UV ABSORPTION: LABORATORY SPECTRUM, FIELD EVIDENCE, AND ATMOSPHERIC IMPACTS Open
Absorption of solar radiation by water vapor in the near-UV region is a poorly-understood but important issue in atmospheric science. To better understand water vapor near-UV absorption, we constructed a cavity ring-down spectrometer with …
View article: CO observations towards H <scp>i</scp>-rich Ultradiffuse Galaxies
CO observations towards H <span>i</span>-rich Ultradiffuse Galaxies Open
We present CO observations towards a sample of six H i-rich Ultradiffuse galaxies (UDGs) as well as one UDG (VLSB-A) in the Virgo Cluster with the Institut de RadioAstronomie Millimétrique (IRAM) 30-m telescope. CO J = 1–0 is marginally de…
View article: Dynamics of threshold solutions for energy critical NLS with inverse square potential
Dynamics of threshold solutions for energy critical NLS with inverse square potential Open
We consider the focusing energy critical NLS with inverse square potential in dimension $d= 3, 4, 5$ with the details given in $d=3$ and remarks on results in other dimensions. Solutions on the energy surface of the ground state are charac…
View article: The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions
The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions Open
We report a systematic survey of a 6.7 GHz Class II methanol maser toward a sample of 448 sources selected from the Red Midcourse Space Experiment Source catalog. These sample sources are composed of high-mass star-forming region (HMSFR) c…
View article: The Brightest Known H<sub>2</sub>CO Maser in the Milky Way: G339.88-1.26
The Brightest Known H<sub>2</sub>CO Maser in the Milky Way: G339.88-1.26 Open
We report the detection of the strongest 6 cm H 2 CO emission in our Galaxy. The detection toward the massive star-forming region G339.88-1.26 was made using the Shanghai Tianma radio telescope (TMRT). The G339.88-1.26 star formation regio…