283 research outputs found
FEDGE - A general-purpose computer program for Finite Element Data Generation. Volume 1 - User's manual
Users manual for /FEDGE/ Finite Element Data Generation computer program - Vol.
ELAS - A general purpose computer program for the equilibrium problems of linear structures
Digital computer program ELAS handles the equilibrium problems of linear structures of one, two, or three dimensional continuum. ELAS generates the governing equations for the unknown deflections of the mesh points that define the stationary point of the total potential energy function associated with the given loading and unknown deflections
VISCEL, a general-purpose computer program for analysis of linear viscoelastic structures. Volume 1 - User's manual
VISCEL computer program user manual for analysis of linear viscoelastic structure
ELAS - A general purpose computer program for the equilibrium problems of linear structures. Volume 1 - User's manual
ELAS general purpose digital computer program for equilibrium problems of linear structure
Viscel: A general purpose computer program for analysis of linear viscoelastic structures, volume 2
The VISCEL program is a general purpose computer program developed for equilibrium analysis of linear viscoelastic structures. The program is written in FORTRAN 5 language to operate on the Univac 1108 computer under the EXEC 8 operating system. The program, an extension of the linear equilibrium problem solver ELAS, is an updated and extended version of its earlier form written for the IBM 7094 computer. Finite element matrix displacement approach coupled with the synchronized material property concept, utilizing incremental time steps, was adopted for the solution presented. The step-by-step procedure involves solution of recursive equations in the time domain, which takes into account the memory of material properties. Incremental and accumulative displacements and stresses are obtained at the end of each time step. In order to minimize the extent of computations resulting from accumulative effects of material memory, the program provides an option which enables the employment of constant time steps in the logarithmic scale. Program documentation is presented
FEDGE - A general-purpose computer program for Finite Element Data Generation. Volume 2 - Program manual
Program manual for /FEDGE/ Finite Element Data Generation computer program - Vol.
VISCEL: A general-purpose computer program for analysis of linear viscoelastic structures (user's manual), volume 1
This program, an extension of the linear equilibrium problem solver ELAS, is an updated and extended version of its earlier form (written in FORTRAN 2 for the IBM 7094 computer). A synchronized material property concept utilizing incremental time steps and the finite element matrix displacement approach has been adopted for the current analysis. A special option enables employment of constant time steps in the logarithmic scale, thereby reducing computational efforts resulting from accumulative material memory effects. A wide variety of structures with elastic or viscoelastic material properties can be analyzed by VISCEL. The program is written in FORTRAN 5 language for the Univac 1108 computer operating under the EXEC 8 system. Dynamic storage allocation is automatically effected by the program, and the user may request up to 195K core memory in a 260K Univac 1108/EXEC 8 machine. The physical program VISCEL, consisting of about 7200 instructions, has four distinct links (segments), and the compiled program occupies a maximum of about 11700 words decimal of core storage
The Transient Ultra-luminous X-ray Source, ULX-4, in M51
We present the results of a temporal and spectral analysis of the transient
source ULX-4 in the galaxy M51. The data used were drawn from Chandra,
XMM-Newton and Swift-XRT archives, spanning the years 2000-2019. The X-ray flux
of the source is seen to vary by two orders of magnitudes within a month but a
short-term variability was not observed over the time intervals of 100-2000
second in the 0.3-10 keV energy band. We find some evidence for the existence
of bi-modality feature in the flux distribution of ULX-4. We identified two
optical sources as possible counterparts within an error radius of 0."18 at 95%
confidence level for ULX-4 based on the archival HST/ACS and HST/WFC3 data.
Blackbody fits of the spectral energy distributions (SEDs) indicate the
spectral type to be B-type stars. One of these counterparts exhibits a
low-amplitude optical periodicity of 264 days in the F606W filter; if we assume
this apparent periodicity is associated with the orbital motion of the donor,
then it is more likely that the donor is a red supergiant satisfying the long
periodicity and accretion via Roche-lobe overflow. Consequently, the SED would
then have to be interpreted as a superposition of emissions from a cold donor
and a hot flow component, most likely from an accretion disk. If, on the other
hand, the periodicity is super orbital in nature i.e., due to possible
interactions of the compact object with a circumstellar disk, the donor could
then be a Be/X star hosting a neutron star.Comment: Accepted for publication in MNRAS. 16 pages, 12 figures, 6 table
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