1,771 research outputs found
Parameter Estimation of Stellar Mass Binary Black Holes under the Network of TianQin and LISA
We present a Bayesian parameter estimation progress to infer the stellar mass
binary black hole properties by TianQin, LISA, and TianQin+LISA. Two typical
Stellar-mass Black Hole Binary systems, GW150914 and GW190521 are chosen as the
fiducial sources. In this work, we establish the ability of TianQin to infer
the parameters of those systems and first apply the full frequency response in
TianQin's data analysis. We obtain the parameter estimation results and explain
the correlation between them. We also find the TianQin+LISA could marginally
increase the parameter estimation precision and narrow the area
compared with TianQin and LISA individual observations. We finally demonstrate
the importance of considering the effect of spin when the binaries have a
non-zero component spin and great derivation will appear especially on mass,
coalescence time and sky location.Comment: 17 pages, 6 figures, comments welcom
Diagnosis and surgical treatment of multiple endocrine neoplasia type 2A
BACKGROUND: This study aims to introduce the diagnosis and surgical treatment of the rare disease multiple endocrine neoplasia type 2A (MEN 2A). METHODS: Thirteen cases of MEN 2A were diagnosed as medullary thyroid carcinoma (MTC) and pheochromocytoma by biochemical tests and imaging examination. They were treated by bilateral adrenal tumor excision or laparoscopic surgery. RESULTS: Nine patients were treated by bilateral adrenal tumor excision and the remaining four were treated by laparoscopic surgery for pheochromocytoma. Ten patients were treated by total thyroidectomy and bilateral lymph nodes dissection and the remaining three were treated by unilateral thyroidectomy for MTC. Up to now, three patients have died of MTC distant metastasis. CONCLUSIONS: We confirmed that MEN 2A can be diagnosed by biochemical tests and imaging examination when genetic testing is not available. Surgical excision is the predominant way to treat MEN 2A; pheochromocytoma should be excised at first when pheochromocytoma and MTC occur simultaneously
Near Real-Time Gravitational Wave Data Analysis of the Massive Black Hole Binary with TianQin
Space-borne gravitational wave detectors can detect sources like the merger
of massive black holes. The rapid identification and localization of the source
would play a crucial role in multi-messenger observation. The geocentric orbit
of the space-borne gravitational wave detector, TianQin, makes it possible to
conduct real-time data transmission. In this manuscript, we develop a search
and localization pipeline for massive black hole binaries with TianQin, under
both regular and real-time data transmission modes. We demonstrate that with
real-time data transmission, it is possible to accurately localize the massive
black hole binaries on-the-fly. With the approaching of the merger, the
localization rapidly shrinks, and the data analysis can be finished at a speed
comparable to the data downlink speed
Measuring the Hubble Constant Using Strongly Lensed Gravitational Wave Signals
The measurement of the Hubble constant plays an important role in the
study of cosmology. In this letter, we propose a new method to constrain the
Hubble constant using the strongly lensed gravitational wave (GW) signals. By
reparameterizing the waveform, we find that the lensed waveform is sensitive to
the . Assuming the scenario that no electromagnetic counterpart of the GW
source can be identified, our method can still give meaningful constraints on
the with the information of the lens redshift. We then apply Fisher
information matrix and Markov Chain Monte Carlo to evaluate the potential of
this method. For the space-based GW detector, TianQin, the can be
constrained within a relative error of 0.3-2\%, using a single strongly
lensed GW event. Precision varies according to different levels of
electromagnetic information.Comment: 8 pages, 4 figure
Prognostic significance of the number of tumors and aggressive surgical approach in colorectal cancer hepatic metastasis
Impact of combinations of time-delay interferometry channels on stochastic gravitational wave background detection
The method of time delay interferometry (TDI) is proposed to cancel the laser
noise in space-borne gravitational-wave detectors. Among all different TDI
combinations, the most commonly used ones are the orthogonal channels A, E and
T, where A and E are signal-sensitive and T is signal-insensitive. Meanwhile,
for the detection of stochastic gravitational-wave background, one needs to
introduce the overlap reduction function to characterize the correlation
between channels. For the calculation of overlap reduction function, it is
often convenient to work in the low-frequency approximation, and assuming the
equal-arm Michelson channels. However, if one wishes to work on the overlap
reduction function of channels, then the low-frequency approximation
fails. We derive the exact form of overlap reduction function for
channels. Based on the overlap reduction function, we calculate the sensitivity
curves of TianQin, TianQin I+II and TianQin + LISA. We conclude that the
detection sensitivity calculated with channels is mostly consistent
with that obtained from the equal-arm Michelson channels.Comment: 18 pages,10 figure
Hydrocarbon Detection Based on Phase Decomposition in Chaoshan Depression, Northern South China Sea
Located in the northern South China Sea, Chaoshan Depression is mainly a residual Mesozoic depression, with a construction of Meso-Cenozoic strata over 7000m thick and good hydrocarbon accumulation conditions. Amplitude attribute of -90°phase component derived by phase decomposition is employed to detect Hydrocarbon in the zone of interest (ZOI) in Chaoshan Depression. And it is found that there are evident amplitude anomalies occurring around ZOI. Phase decomposition is applied to forward modeling results of the ZOI, and high amplitudes occur on the -90°phase component more or less when ZOI is charged with hydrocarbon, which shows that the amplitude abnormality in ZOI is probably caused by oil and gas accumulation
Difference in the regulation of IL-8 expression induced by uropathogenic E. coli between two kinds of urinary tract epithelial cells
Bacterial adherence to epithelial cells is a key virulence trait of pathogenic bacteria. The type 1 fimbriae and the P-fimbriae of uropathogenic Escherichia coli (UPEC) have both been described to be important for the establishment of urinary tract infections (UTI). To explore the interactions between the host and bacterium responsible for the different environments of UPEC invasion, we examined the effect of pH and osmolarity on UPEC strain J96 fimbrial expression, and subsequent J96-induced interleukin-8 (IL-8) expression in different uroepithelial cells. The J96 strain grown in high pH with low osmolarity condition was favorable for the expression of type 1 fimbriae; whereas J96 grown in low pH with high osmolarity condition was beneficial for P fimbriae expression. Type 1 fimbriated J96 specifically invaded bladder 5637 epithelial cells and induced IL-8 expression. On the contrary, P fimbriated J96 invaded renal 786-O epithelial cells and induced IL-8 expression effectively. Type 1 fimbriated J96-induced IL-8 induction involved the p38, as well as ERK, JNK pathways, which leads to AP-1-mediated gene expression. P fimbriated J96-induced augmentation of IL-8 expression mainly involved p38-mediated AP-1 and NF-κB transcriptional activation. These results indicate that different expression of fimbriae in J96 trigger differential IL-8 gene regulation pathways in different uroepithelial cells
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