Search results for "Star"

Post-post-Newtonian effects on a clean nearly-Newtonian binary

1983

Etude du taux de changement temporel moyen de l'energie newtonienne et du moment d'une binaire presque newtonienne, ponctuelle. On trouve qu'il faut ajouter quelques termes post-post newtoniens non seculaires aux flux radiatifs seculaires standards. Les termes post-post newtoniens tendent vers zero pour l'observateur du centre de masse newtonien dans le cas de l'energie mais pas dans le cas du moment. Du fait de la longue periode de ces termes ils sont observationnellement significatifs, c'est-a-dire qu'ils vont apparaitre comme s'ils etaient des effets seculaires

Gravitational-wave Constraints on the Equatorial Ellipticity of Millisecond Pulsars

2020

We present a search for continuous gravitational waves from five radio pulsars, comprising three recycled pulsars (PSR J0437-4715, PSR J0711-6830, and PSR J0737-3039A) and two young pulsars: the Crab pulsar (J0534+2200) and the Vela pulsar (J0835-4510). We use data from the third observing run of Advanced LIGO and Virgo combined with data from their first and second observing runs. For the first time, we are able to match (for PSR J0437-4715) or surpass (for PSR J0711-6830) the indirect limits on gravitational-wave emission from recycled pulsars inferred from their observed spin-downs, and constrain their equatorial ellipticities to be less than 10-8. For each of the five pulsars, we perfor…

First narrow-band search for continuous gravitational waves from known pulsars in advanced detector data

2017

Spinning neutron stars asymmetric with respect to their rotation axis are potential sources of continuous gravitational waves for ground-based interferometric detectors. In the case of known pulsars a fully coherent search, based on matched filtering, which uses the position and rotational parameters obtained from electromagnetic observations, can be carried out. Matched filtering maximizes the signal-to-noise (SNR) ratio, but a large sensitivity loss is expected in case of even a very small mismatch between the assumed and the true signal parameters. For this reason, {\it narrow-band} analyses methods have been developed, allowing a fully coherent search for gravitational waves from known …

Green Design of Novel Starch-Based Packaging Materials Sustaining Human and Environmental Health

2021

A critical overview of current approaches to the development of starch-containing packaging, integrating the principles of green chemistry (GC), green technology (GT) and green nanotechnology (GN) with those of green packaging (GP) to produce materials important for both us and the planet is given. First, as a relationship between GP and GC, the benefits of natural bioactive compounds are analyzed and the state-of-the-art is updated in terms of the starch packaging incorporating green chemicals that normally help us to maintain health, are environmentally friendly and are obtained via GC. Newer approaches are identified, such as the incorporation of vitamins or minerals into films and coati…

Очерки истории грузино-балтийских взаимоотношений

2015

Askēzes fenomenoloģija vācu un bizantiešu misticismā. Meistera Ekharta un Gregora Palamasa meditācijas doktrīnas salīdzinošā analīze

2022

Šis darbs ir veltīts vācu un bizantiešu lielajiem mistiķiem J. Ekhartam un Gr. Palamas, kuru piemērā tiek salīdzināta teoloģiskā un filozofiskā izpratne par askēzes fenomenu kā mistiskas Dieva izziņas pieredzi. Pētot askētisko prakšu īpatnības, autors pievēršas askēzes mistiskajiem pamatiem, lai Ekharta un Palamas mācībās atklātu kopīgu priekšstatu par dievišķo elementu cilvēkā, kas nav atrodams bez īpašiem "garīgajiem vingrinājumiem" – askēzes.

Cytosolic Ca2+ and Phosphoinositide Hydrolysis Linked to Constitutively Active α1d-Adrenoceptors in Vascular Smooth Muscle

2003

In the present study, we analyzed changes in intracellular Ca2+ levels and inositol phosphate accumulation related to a population of alpha 1d-adrenoceptors in rat aorta resembling constitutively active receptors. Following intracellular Ca2+ store depletion by noradrenaline in Ca2+-free medium and removal of the agonist, restoration of extracellular Ca2+ induced four signals: a biphasic (transient and sustained) increase in [Ca2+]i, inositol phosphate accumulation, and a contractile response in the aorta. The transient increase in Ca2+, the inositol phosphate accumulation, and the contractile response were not observed in aortae incubated with prazosin or BMY 7378 [8-[2-[4-(2-methoxyphenyl…

Con el hambre a las puertas. El abastecimiento de Valencia durante la Guerra de los Dos Pedros (1356-1366)

2017

Este artículo pretende contribuir a la corriente de renovación intelectual que en los últimos años se ha abierto con la llamada nueva historia política. Específicamente, pretende abordar la problemática del hambre en una ciudad durante un conflicto bélico (la Guerra de los Dos Pedros) y, sobre todo, las políticas que sus dirigentes aplicaron y si estas fueron efectivas o no . This article aims to contribute to the intellectual renewal trend that has opened in recent years with the so-called new political history. Specifically, it aims to address the problem of hunger in a city during a war (the war of the Two Peters) focusing on the policies that their leaders applied and whether they were …

Hidroksilapatītu analītiskās raksturošanas metožu izstrāde

2018

Hidroksilapatītu analītiskās raksturošanas metožu izstrāde. Grebņevs V., zinātniskais vadītājs Dr. chem., prof. Vīksna A. Bakalaura darbs, 100 lappuses, 24 attēli, 59 tabulas, 79 literatūras avoti, 12 pielikumi. Latviešu valodā. Darbā apkopota literatūra par hidroksilapatītiem, to īpašībām, veidiem, izmantošanu un sintēzi, par klasiskajām un modernajām kalcija un fosfora kvantitatīvās noteikšanas metodēm tajos. Eksperimentālajā daļā veikta kalcija un fosfora kvantitatīvā noteikšana hidroksilapatīta paraugā no ražotāja Cambioceramics. Abi elementi tika kvantificēti ar gravimetriju, fotometriju, viļņu dispersīvo rentgenfluorescences spektrometriju, induktīvi saistītās plazmas optiskās emisija…

Constraints on Minute-Scale Transient Astrophysical Neutrino Sources

2019

High-energy neutrino emission has been predicted for several short-lived astrophysical transients including gamma-ray bursts (GRBs), core-collapse supernovae with choked jets, and neutron star mergers. IceCube's optical and x-ray follow-up program searches for such transient sources by looking for two or more muon neutrino candidates in directional coincidence and arriving within 100 s. The measured rate of neutrino alerts is consistent with the expected rate of chance coincidences of atmospheric background events and no likely electromagnetic counterparts have been identified in Swift follow-up observations. Here, we calculate generic bounds on the neutrino flux of short-lived transient so…