A5071729705- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- GNSS positioning and interference
- Particle Detector Development and Performance
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
- Neutrino Physics Research
- Breast Implant and Reconstruction
- Polymer composites and self-healing
- Reconstructive Surgery and Microvascular Techniques
- Synthesis and properties of polymers
- Seismology and Earthquake Studies
- Image Processing Techniques and Applications
- ZnO doping and properties
- Reconstructive Facial Surgery Techniques
- Synthetic Organic Chemistry Methods
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
National Astronomical Observatories
2023-2025
Chinese Academy of Sciences
2023-2025
Purple Mountain Observatory
2016-2025
Australia Telescope National Facility
2018-2025
Sichuan Cancer Hospital
2023-2025
University of Chinese Academy of Sciences
2017-2024
Astronomy Australia
2024
Commonwealth Scientific and Industrial Research Organisation
2018-2024
University of Electronic Science and Technology of China
2023-2024
Zhejiang Gongshang University
2022-2023
In this paper, we describe the International Pulsar Timing Array second data release, which includes recent pulsar timing obtained by three regional consortia: European Array, North American Nanohertz Observatory for Gravitational Waves, and Parkes Array. We analyse where possible combine high-precision 65 millisecond pulsars are regularly observed these groups. A basic noise analysis, including processes both correlated uncorrelated in time, provides models ephemerides pulsars. find that...
Abstract We present the third data release from Parkes Pulsar Timing Array (PPTA) project. The contains observations of 32 pulsars obtained using 64-m ‘Murriyang’ radio telescope. span is up to 18 yr with a typical cadence 3 weeks. This formed by combining an updated version our second $\sim$ more recent primarily ultra-wide-bandwidth receiver system that operates between 704 and 4032 MHz. provide calibrated pulse profiles, flux density dynamic spectra, times arrival, initial pulsar timing...
The polarization of fast radio bursts (FRBs), which are bright astronomical transient phenomena, contains information about their environments. Using wide-band observations with two telescopes, we report measurements five repeating FRBs and find a trend lower at frequencies. This behavior is modeled as multipath scattering, characterized by single parameter, σRM, the rotation measure (RM) scatter. Sources higher σRM have RM magnitude scattering time scales. sources highest FRB 20121102A...
Abstract We describe 14 yr of public data from the Parkes Pulsar Timing Array (PPTA), an ongoing project that is producing precise measurements pulse times arrival 26 millisecond pulsars using 64-m radio telescope with a cadence approximately 3 weeks in three observing bands. A comprehensive description pulsar systems employed at since 2004 provided, including calibration methodology and analysis stability system components. attempt to provide full accounting reduction raw measured Stokes...
Nonalcoholic steatohepatitis (NASH) represents a severe disease subtype of nonalcoholic fatty liver (NAFLD) that is thought to be highly associated with systemic metabolic abnormalities. It characterized by series substantial damage, including hepatocellular steatosis, inflammation, and fibrosis. The end stage NASH, in some cases, may result cirrhosis carcinoma (HCC). Nowadays large number investigations are actively under way test various therapeutic strategies, emerging oligonucleotide...
Fast radio bursts (FRBs) are characterized by millisecond durations, high Galactic latitude positions, and dispersion measures. Very recently, the cosmological origin of FRB 150418 has been confirmed \cite{kea16}, FRBs now strong competitors as probes. The simple sharp feature signal is ideal for them to probe some fundamental laws physics. Here we show that analyzing delay time between different frequencies, data can place stringent upper limits on rest mass photon. For at $z=0.492$, one...
Abstract We report the first detection of polarization angle orthogonal jumps, a phenomenon previously only observed from radio pulsars, fast burst (FRB) source FRB 20201124A. find three cases jumps in over 2000 bursts, all resembling those pulsar single pulses. propose that are due to superposition two emission modes could be produced highly magnetized plasma, and they caused by line sight sweeping across rotating magnetosphere. The shortest jump timescale is order 1 millisecond, which...
The nature of dark matter remains obscure in spite decades experimental efforts. mass candidates can span a wide range, and its coupling with the Standard Model sector uncertain. All these unknowns make detection extremely challenging. Ultralight matter, m∼10−22 eV, is proposed to reconcile disagreements between observations predictions from simulations small-scale structures cold paradigm while remaining consistent other observations. Because large de Broglie wavelength local occupation...
Novel states of matter arise in quantum materials due to strong interactions among electrons. A nematic phase breaks the point group symmetry crystal lattice and is known emerge correlated materials. Here we report observation an intra-unit-cell order signatures Pomeranchuk instability Kagome metal ScV6Sn6. Using scanning tunneling microscopy spectroscopy, reveal a stripe-like breaking rotational within itself. Moreover, identify set van Hove singularities adhering layer electrons, which...
The Parkes Pulsar Timing Array (PPTA) project monitors two dozen millisecond pulsars (MSPs) in order to undertake a variety of fundamental physics experiments using the 64m radio telescope. Since June 2017 we have been undertaking commensal searches for fast bursts (FRBs) during MSP observations. Here, report discovery four FRBs (171209, 180309, 180311 and 180714). detected events include an FRB with highest signal-to-noise ratio ever at observatory, which exhibits unusual spectral...
Fast Radio Bursts (FRBs) are bright radio transients with millisecond duration at cosmological distances. Since compact dark matter/objects (COs) could act as lenses and cause split of this kind very short signals, Mu$\rm{\tilde{n}}$oz et al. (2016) has proposed a novel method to probe COs lensing FRBs. In Letter, we for the first time apply real data give constraints nature currently available FRB observations. We emphasize information from dynamic spectra FRBs is quite necessary...
Abstract A nanohertz-frequency stochastic gravitational-wave background can potentially be detected through the precise timing of an array millisecond pulsars. This produces low-frequency noise in pulse arrival times that would have a characteristic spectrum common to all pulsars and well-defined spatial correlation. Recently North American Nanohertz Observatory for Gravitational Waves collaboration (NANOGrav) found evidence common-spectrum component their 12.5 yr data set. Here we report on...
We present the third data release from Parkes Pulsar Timing Array (PPTA) project. The contains observations of 32 pulsars obtained using 64-m "Murriyang" radio telescope. span is up to 18 years with a typical cadence 3 weeks. This formed by combining an updated version our second $\sim 3$ more recent primarily ultra-wide-bandwidth receiver system that operates between 704 and 4032 MHz. provide calibrated pulse profiles, flux-density dynamic spectra, times arrival, initial pulsar timing...
Vitrimers as an emerging class of dynamic polymer networks hold great promise for the development sustainable thermosets. While straightforward method to prepare vitrimers from commodity polymers is cost-competitive, most studies involved synthesis with specific functional groups and/or crosslinkers. Herein, we demonstrated a simple and scalable approach produce poly(ethylene-vinyl acetate) (EVA) by direct cross-linking industrial EVA product commercial bis[3-(trimethoxysilyl)propyl]amine...
ABSTRACT As the sample size of repeating fast radio bursts (FRBs) has grown, an increasing diversity phenomenology emerged. Through long-term multi-epoch studies FRBs, it is possible to assess which phenomena are common population and unique individual sources. We present a monitoring campaign FRB source 20180301A using ultra-wideband low (UWL) receiver observations with Murriyang, Parkes 64-m telescope. The covered wide frequency band spanning approximately 0.7–4 GHz, yielded detection 46...
Abstract Rotating radio transients (RRATs) are neutron stars that emit sporadic bursts. We detected 1955 single pulses from RRAT J1913+1330 using the 19 beam receiver of Five-hundred-meter Aperture Spherical Telescope. These were in distinct clusters, with 49.4% them occurring a waiting time one rotation period. The energy distribution these individual exhibited wide range, spanning 3 orders magnitude, reminiscent repeating fast bursts (FRBs). Furthermore, we observed abrupt variations pulse...
We present timing solutions and analyses of 11 pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). These were using an ultra-wide bandwidth receiver in drift-scan observations made during commissioning phase FAST, then confirmed timed 64-m Parkes Radio Telescope. Each pulsar has been observed over a span at least one year. Highlighted discoveries include PSR J0344-0901, which displays mode-changing behaviour may belong to class so-called `swooshing'...
Inverse vulcanization provides a facile route to transform industrial byproduct sulfur into attractive polymeric materials with variety of applications. Herein, an inverse vulcanized copolymer (PSM) was synthesized by copolymerization biomass magnolol and sulfur. PSM presents outstanding intrinsic flame retardancy the formation highly pyrolysis-resistant carbonaceous material during combustion. Especially, it can serve as multifunctional ingredient when utilized in rubber composites. The...
Abstract Fast radio bursts (FRBs) are millisecond-duration pulses occurring at cosmological distances with a mysterious origin. Observations show that least some FRBs produced by magnetars. All magnetar-powered FRB models require triggering mechanisms, among which the most popular is cracking of crust neutron star, called starquake. However, so far there has been no decisive evidence for this speculation. Here we report energy functions three active repeating FRBs, universal break around 10...
<title>Abstract</title> Fast radio bursts (FRBs) are fierce flashes lasting for a few milliseconds from the sky. Although their connection to strongly magnetized neutron stars has been indicated, exact triggering process and radiation mechanism still unknown highly debated. Due extremely short duration, observation of FRBs long difficult task even large telescopes. The difficulty results fact that information obtained in observations is always incomplete, since telescope limited flux...