232 research outputs found
Determination of QPO properties in the presence of strong broad-band noise: a case study on the data of MAXI J1820+070
Accurate calculation of the phase lags of quasi-periodic oscillations (QPOs)
will provide insight into their origin. In this paper we investigate the phase
lag correction method which has been applied to calculate the intrinsic phase
lags of the QPOs in MAXI J1820+070. We find that the traditional additive model
between BBN and QPOs in the time domain is rejected, but the convolution model
is accepted. By introducing a convolution mechanism in the time domain, the
Fourier cross-spectrum analysis shows that the phase lags between QPOs
components in different energy bands will have a simple linear relationship
with the phase lags between the total signals, so that the intrinsic phase lags
of the QPOs can be obtained by linear correction. The power density spectrum
(PDS) thus requires a multiplicative model to interpret the data. We briefly
discuss a physical scenario for interpreting the convolution. In this scenario,
the corona acts as a low-pass filter, the Green's function containing the noise
is convolved with the QPOs to form the low-frequency part of the PDS, while the
high-frequency part requires an additive component. We use a multiplicative PDS
model to fit the data observed by Insight-HXMT. The overall fitting results are
similar compared to the traditional additive PDS model. Neither the width nor
the centroid frequency of the QPOs obtained from each of the two PDS models
were significantly different, except for the r.m.s. of the QPOs. Our work thus
provides a new perspective on the coupling of noise and QPOs.Comment: 13 pages, 8 figure
PEP-1-CAT protects hypoxia/reoxygenation-induced cardiomyocyte apoptosis through multiple sigaling pathways
Genetic Variations in Plasma Circulating DNA of HBV-Related Hepatocellular Carcinoma Patients Predict Recurrence after Liver Transplantation
BACKGROUND: Recurrence prediction of hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC) patients undergoing liver transplantation (LT) present a great challenge because of a lack of biomarkers. Genetic variations play an important role in tumor development and metastasis. METHODS: Oligonucleotide microarrays were used to evaluate the genetic characteristics of tumor DNA in 30 HBV-related HCC patients who were underwent LT. Recurrence-related single-nucleotide polymorphism were selected, and their prognostic value was assessed and validated in two independent cohorts of HCC patients (N = 102 and N = 77), using pretransplant plasma circulating DNA. Prognostic significance was assessed by Kaplan-Meier survival estimates and log-rank tests. Multivariate analyses were performed to evaluate prognosis-related factors. RESULTS: rs894151 and rs12438080 were significantly associated with recurrence (P = .003 and P = .004, respectively). Multivariate analyses demonstrated that the co-index of the 2 SNPs was an independent prognostic factor for recurrence (P = .040). Similar results were obtained in the third cohort (N = 77). Furthermore, for HCC patients (all the 3 cohorts) exceeding Milan criteria, the co-index was a prognostic factor for recurrence and survival (P<.001 and P = .002, respectively). CONCLUSIONS: Our study demonstrated first that genetic variations of rs894151 and rs12438080 in pretransplant plasma circulating DNA are promising prognostic markers for tumor recurrence in HCC patients undergoing LT and identify a subgroup of patients who, despite having HCC exceeding Milan criteria, have a low risk of post-transplant recurrence
The Minimum Variation Timescales of X-ray bursts from SGR J1935+2154
The minimum variation timescale (MVT) of soft gamma-ray repeaters can be an
important probe to estimate the emission region in pulsar-like models, as well
as the Lorentz factor and radius of the possible relativistic jet in gamma-ray
burst (GRB)-like models, thus revealing their progenitors and physical
mechanisms. In this work, we systematically study the MVTs of hundreds of X-ray
bursts (XRBs) from SGR J1935+2154 observed by {\it Insight}-HXMT, GECAM and
Fermi/GBM from July 2014 to Jan 2022 through the Bayesian Block algorithm. We
find that the MVTs peak at 2 ms, corresponding to a light travel time
size of about 600 km, which supports the magnetospheric origin in pulsar-like
models. The shock radius and the Lorentz factor of the jet are also constrained
in GRB-like models. Interestingly, the MVT of the XRB associated with FRB
200428 is 70 ms, which is longer than that of most bursts and implies
its special radiation mechanism. Besides, the median of MVTs is 7 ms, shorter
than the median MVTs of 40 ms and 480 ms for short GRBs or long GRBs,
respectively. However, the MVT is independent of duration, similar to GRBs.
Finally, we investigate the energy dependence of MVT and suggest that there is
a marginal evidence for a power-law relationship like GRBs but the rate of
variation is at least about an order of magnitude smaller. These features may
provide an approach to identify bursts with a magnetar origin.Comment: accepted for publication in ApJ
Identifying long-term stable refugia for dominant Castanopsis species of evergreen broad-leaved forests in East Asia: A tool for ensuring their conservation
Identifying and protecting refugia is a priority for conservation management under projected anthropogenic climate change. We have two main objectives: the first is to explore the spatial (East Asia) and temporal (Last Glacial Maximum to year 2070) distribution patterns of dominant Castanopsis species of evergreen broad-leaved forests, also the relation with their niche breadths; the second is to identify long-term stable refugia for preserving these species and provide a framework of conservation strategies. We find that there is an extraordinary richness with 32 dominant Castanopsis species, and they form both a geographically and climatically almost unbroken connection from ca. 5°N to 38°N, having thus ecological significance. During the Mid-Holocene and, particularly, the Last Glacial Maximum, the predicted suitable areas of the species as a whole were larger than those in the present. By 2070, potentially suitable areas with high richness of dominant Castanopsis species will be reduced by 94.5 % on average. No correlation between species niche breadths and distribution ranges is found, which could be due to regional climate stability. Mountains of southwestern and southern Yunnan in China are identified as climatically long-term stable refugia for 7¿9 Castanopsis species. We recommend that these refugia have the highest priority of conservation to prevent their extinction. Our suggested urgent measures include improving the effectiveness of currently protected Castanopsis species and expanding the network of protected areas to cover a larger fraction of the refugia, as well as ensuring Castanopsis species natural regeneration potential in fragmented and natural secondary forest areas.This study received financial support from the Major Program for Basic Research Project of Yunnan Province, China (202101BC070002), the Science and Technology Department of Yunnan University, China (2019YNU002), the Ministry of Science and Technology of China (2015FY210200-15), the Spanish Ministry of Science and Innovation (grant PID2020-119163GB-I00 funded by MCIN/AEI/10.13039/501100011033), the Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency of Japan (JPMEERF20202002), and the Northeastern Research Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Thailand.Keywords
1. Introduction
2. Materials and methods
2.1. Data collection and notations
2.2. Ecological niche modeling
2.3. Data analyses
3. Results
3.1. Dominant Castanopsis species in East Asia today: richness and distribution patterns
3.2. Richness of dominant Castanopsis species shaped by climate change
3.3. Niche groups and niche breadths of dominant Castanopsis species
3.4. Climatically long-term stable refugia
4. Discussion
4.1. Richness of dominant Castanopsis species shaped by climate change
4.2. Niche groups and niche breadths of dominant Castanopsis species
4.3. Long-term stable refugia and conservation strategies
5. Conclusions
CRediT authorship contribution statement
Declaration of competing interest
Acknowledgements
Appendix A. Supplementary material
Reference
Search for Quasi-Periodical Oscillations in Precursors of Short and Long Gamma Ray Bursts
The precursors of short and long Gamma Ray Bursts (SGRBs and LGRBs) can serve
as probes of their progenitors, as well as shedding light on the physical
processes of mergers or core-collapse supernovae. Some models predict the
possible existence of Quasi-Periodically Oscillations (QPO) in the precursors
of SGRBs. Although many previous studies have performed QPO search in the main
emission of SGRBs and LGRBs, so far there was no systematic QPO search in their
precursors. In this work, we perform a detailed QPO search in the precursors of
SGRBs and LGRBs detected by Fermi/GBM from 2008 to 2019 using the power density
spectrum (PDS) in frequency domain and Gaussian processes (GP) in time domain.
We do not find any convinced QPO signal with significance above 3 ,
possibly due to the low fluxes of precursors. Finally, the PDS continuum
properties of both the precursors and main emissions are also studied for the
first time, and no significant difference is found in the distributions of the
PDS slope for precursors and main emissions in both SGRBs and LGRBs.Comment: submitte
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