Star Cross-Identification in Big Catalogs with Significant EPOCH Difference and without proper Motions

Structure of proper motions in a sunspot penumbra

Proper Motions of Oh Masers and Magnetic Fields in Massive Star-forming Regions

We present data of proper motions of OH masers in the massive star-forming regions ON 1, K3-50, and W51 Main/South. OH maser motions in ON 1 are consistent with expansion at approximately 5 km s−1, likely tracing the expanding ultracompact H II region. Motions in K3-50 are faster and may be indicating the final stages of OH maser emission in the source, before the OH masers turn off as the H II...

The Difference of Psychopathology in Patients with Multiple Sclerosis with and without Substance Abuse

Background & Aims: Substance abuse may have different effects on multiple sclerosis. Till now, studies on substance abuse and its correlation with psychopathology, type and severity of multiple sclerosis are limited. We conducted this study to evaluate the psychopathology of patients with multiple sclerosis with and without substance abuse. Methods: In this case-control, cross-sectional study p...

Chest pain and high troponin level without significant respiratory symptoms in young patients with COVID-19

Background: Of all patients infected with COVID-19, 95% have mild symptoms, but 5% may experience severe illness. There are reports of myocardial injury associated with the COVID19 infection in middle aged and old people with baseline cardiac conditions. Acute myocardial injury has been suggested as a marker for disease severity. Sometimes it is hard to differentiate between acute coronary synd...

Determination of proper motions and membership of the open star cluster NGC 2548 ?

Absolute proper motions, their corresponding errors and membership probabilities of 501 stars in the intermediate-age open cluster NGC 2548 region are determined from MAMA measurements of 10 photographic plates. The plates have the maximum epoch difference of 82 years and they were taken with the double astrograph at Zô-Sè station of Shanghai Observatory, which has an aperture of 40 cm and a pl...