Lecsökkent a számítási teljesítménye az új MS-EXCEL-nek? Has the computational performance of the new MS-EXCEL decreased?

Microsoft Office products are known and used all around the world. One of the most significant application in this package is MS-Excel, which is used by almost every company’s spreadsheet manager. In an update of August 2020 the SOLVER add-on of Excel has become much slower without any additional features. It is a built-in set of general problem-solving methods for smaller tasks. This work will track the performance decline and quantify observations through tasks in different versions of MS-Excel. Kivonat Az Microsoft Office termékeket a világ minden táján ismerik és használják. Ebből az egyik legjelentősebb alkalmazás az MS-Excel, amelyet szinte minden vállalat táblázatkezelőként használ. 2020. augusztusában történt nagyobb frissítés után, a SOLVER bővítmény nagyon lassú és kiszámíthatatlan lett, amely egy beépített általános problémamegoldó módszergyűjtemény kisebb feladatokra. Jelen mű ezt a teljesítmény beli visszaesést fogja bemutatni számszerűsített feladatokon keresztül különböző MS-Excel verziókban. &nbsp

Modeling the early multiwavelength emission in GRB130427A

One of the most powerful gamma-ray bursts, GRB 130427A was swiftly detected from GeV $\gamma$-rays to optical wavelengths. In the GeV band, the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope observed the highest-energy photon ever recorded of 95 GeV, and a bright peak in the early phase followed by emission temporally extended for more than 20 hours. In the optical band, a bright flash with a magnitude of $7.03\pm 0.03$ in the time interval from 9.31 s to 19.31 s after the trigger was reported by RAPTOR in r-band. We study the origin of the GeV $\gamma$-ray emission, using the multiwavelength observation detected in X-ray and optical bands. The origin of the temporally extended LAT, X-ray and optical flux is naturally interpreted as synchrotron radiation and the 95-GeV photon and the integral flux upper limits placed by the HAWC observatory are consistent with synchrotron self-Compton from an adiabatic forward shock propagating into the stellar wind of its progenitor. The extreme LAT peak and the bright optical flash are explained through synchrotron self-Compton and synchrotron emission from the reverse shock, respectively, when the ejecta evolves in thick-shell regime and carries a significant magnetic field.Comment: Accepted in ApJ (10 Pages, 4 figures

External Inverse-Compton Emission from Low-Luminosity Gamma-Ray Bursts: Application to GRB 190829A

The detection of TeV gamma-ray bursts (GRBs) brought new opportunities for studying the physics of particle acceleration at relativistic shocks. The \hess telescopes recently observed very-high-energy (VHE) emission from a nearby low-luminosity GRB, GRB 190829A. Follow-up observations with, e.g., Swift-XRT, revealed unusual flare activities at $\sim 10^3\rm~s$, which can be caused by a long-lasting central engine. We show that the VHE emission during the H.E.S.S. observation time is naturally produced in the external inverse-Compton (EIC) scenario, where seed photons supplied by the flares or other late-time dissipation are upscattered to VHE energies by the non-thermal electrons accelerated at the external forward shock. Our calculations show that the EIC flare nearly coincides with the late-prompt flare, but extends $\sim3-4$ times longer than the duration of the late-prompt flare. The preferred kinetic energy and initial Lorentz factor used in our model are $\sim 10^{52}\rm~erg$ and $\sim 20$, respectively. Understanding the mechanisms of the VHE emission from low-luminosity GRBs will help us constrain the properties of the outflow and the central engine activities, as well as the particle acceleration mechanism.Comment: 12 pages, 6 figures, accepted for publication in ApJ. HESS data are added, figures are updated, appendix is extended, main conclusions unchange