Distribution of HNCO 505−404_{05}-4_{04} in Massive Star-forming Regions

The goal of this paper is to study the spatial distribution of HNCO in massive star-forming regions, and investigate its spatial association with infrared sources, as well as physical conditions in region of HNCO emission. We have mapped nine massive star-forming regions in HNCO 5$_{05}-4_{04}$ with the Purple Mountain Observatory 13.7m telescope. The C18O maps of these sources were obtained simultaneously. The HNCO emission shows compact distribution, with emission peak centred on water masers. Nearly all the HNCO clumps show signs of embedded mid-infrared or far-infrared sources. The FWHM sizes of HNCO clumps are significantly smaller than C18O clumps but rather similar to HC3N clumps. We also found good correlation between the integrated intensities, linewidths and LSR velocities of HNCO and HC3N emission, implying similar excitation mechanism of these two species. As such, collisional excitation is likely to be the dominant excitation mechanism for HNCO 5$_{05}-4_{04}$ emission in galactic massive star-forming regions.Comment: 9 pages, 4 figures, accepted by A&

Research Progress on Integrated Traditional Chinese and Western Medicine in the Treatment of Post-Cholecystectomy Syndrome

Laparoscopic cholecystectomy (LC) is a highly accepted treatment at this stage, with the increasing incidence of biliary tract disease and the development of endoscopic technique in recent years However, some patients after cholecystectomy still have symptoms similar to preoperative symptoms, such as abdominal pain, diarrhea, indigestion and so on. This series of syndromes has become a common clinical problem at present.This article reviews the research progress of etiology, pathogenesis, diagnosis and treatment of post-cholecystectomy syndrome by reading related literatures

Restricted independence in displacement function for better estimation of cyclicity

Agraïments: The author is partially supported by NSFC grant #11471228 (X. Chen), NSFC grant # 11501083 (Z. Wang), and NSFC grants # 11231001 and # 11221101 (W. Zhang).Since the independence of focal values is a sufficient condition to give a number of limit cycles arising from a center-focus equilibrium, in this paper we consider a restricted independence to a parametric curve, which gives a method not only to increase the lower bound for the cyclicity of the center-focus equilibrium but also to be available when those focal values are not independent. We apply the method to a nondegenerate cubic center-focus variety and prove that the cyclicity reaches its an upper bound