We report our attempts to locate the progenitor of the type Ic SN 2004gt in NGC 4038. We use high resolution HST ACS images of SN 2004gt and have compared them with deep pre-explosion HST WFPC2 F336W, F439W, F555W and F814W images. We identify the SN location on the pre-explosion frames with an accuracy of 5mas. We show that the progenitor is below the detection thresholds of all the pre-explos...

I track the history of star count estimates of the Milky Way field star and open cluster IMFs, concentrating on the neglected mass range from 1 to 15 M⊙. The prevalent belief that the IMF is universal appears to be without basis for this mass range. Two recent estimates of the field star IMF using different methods and samples give values of the average logarithmic slope Γ between -1.7 and -2.1...

CONTEXT Core training specifically for track and field athletes is vague, and it is not clear how it affects dynamic balance and core-endurance measures. OBJECTIVE To determine the effects of a 6-week core-stabilization-training program for high school track and field athletes on dynamic balance and core endurance. DESIGN Test-retest. SETTING High school in north central West Virginia. ...

We present the localization and host galaxies of one repeating two apparently non-repeating Fast Radio Bursts. FRB20180301A was detected localized with Karl G. Jansky Very Large Array to a star-forming galaxy at $z=0.3304$. FRB20191228A, FRB20200906A were by Australian Square Kilometre Pathfinder $z=0.2430$ $z=0.3688$, respectively. combine these 13 other well-localized FRBs in literature, anal...

investigations on vibration behaviors of railway track systems were attempted in this research. this was made by conducting a comprehensive field investigation into the free vibration of track systems and response of tracks to train moving loads. in-situ modal analysis was used in a railway track field as an efficient method of investigating dynamic properties of railway track systems. natural ...

A 22-year-old Malay female presented with left eye floaters for 2 weeks, associated with temporal visual field defect and metamorphopsia for 3 days. She has a guinea pig and a hedgehog at home, but denied being bitten or scratched by them. Her visual acuity at presentation was 6/12 on the left eye and 6/6 on the right eye. Her left eye relative afferent pupillary defect was barely positive with...

in this paper, the main factors in the analysis of the railway concrete sleepers areinvestigated and new recommendations are made in order to improve the accuracy of the currentpractices in analysis of the railway track system. first, a comprehensive literature survey isconducted, then, fem models for a railway track system are developed and used to discuss andevaluate the assumptions commonly ...