Sökning: "mass loss rate"

Visar resultat 1 - 5 av 122 avhandlingar innehållade orden mass loss rate.

1. 1. Mass Loss of Evolved Stars : Improving Mass-Loss Rates and Distances

   Författare :Miora Andriantsaralaza; Paul Barklem; Elvire De Beck; Susanne Höfner; Jacco van Loon; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AGB stars; Mass loss; Distance; Circumstellar matter; Radio interferometry; Stellar evolution; Fysik med inriktning mot astrofysik; Physics with specialization in Astrophysics;

   Sammanfattning : In the final stages of their lives, low to intermediate-mass stars enter the Asymptotic Giant Branch (AGB) phase, where they experience significant mass loss through dusty stellar winds. This mass loss is pivotal, not only for the chemical enrichment of the interstellar medium, setting the stage for new stars and planets to form, but also in dictating the evolution and the ultimate fate of the stars themselves. LÄS MER

3. 2. Molecules and Dust around AGB stars : Mass-loss rates and molecular abundances

   Författare :Sofia Ramstedt; Hans Olofsson; Fredrik Schöier; José Cernicharo; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; AGB stars; mass-loss; circumstellar abundances; Formation and development of stars; Stjärnors bildning och utveckling; Astronomy; astronomi;

   Sammanfattning : All stars with a stellar mass of about 0.8–8 MSun will end their lives as asymptotic giant branch (AGB) stars. Through their extensive mass loss the AGB stars constitutes an important source of nuclear processed material. LÄS MER

4. 3. Lumbar spinal stenosis : Body mass index and the patient's perspective

   Författare :Björn Knutsson; Karl Michaëlsson; Bengt Sandén; Göran Sjödén; Paul Gerdhem; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Antonovsky; back pain; BMI; body mass index; Bygghalsan; cohort study; coping; EQ-5D; excess weight; leg pain; LSS; lumbar spinal stenosis; obesity; ODI Oswestry disability index; overweight; patient-centered; patient-physician relationship; patient-perspective; patient-related-outcome-measure; PROMs; qualitative study; spinal stenosis; salutogenesis; salutogenic; sciatica; spine surgery; suffering; Swedish spine register; Swespine; VAS; weight loss; weight change; Orthopaedics; Ortopedi;

   Sammanfattning : During recent decades, lumbar spinal stenosis (LSS) has become the most common indication for spine surgery, a change that coincides with a higher worldwide prevalence of overweight and obesity. Thus, surgical treatment of LSS in the overweight and obese population is common and increasing in scope. LÄS MER

5. 4. Stellar Winds of Cool Giants : Investigating the Mass-Loss Mechanism of AGB Stars

   Författare :Sofie Liljegren; Susanne Höfner; Kjell Eriksson; Bernd Freytag; Hans Olofsson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; late-type stars; AGB stars; stellar winds; stellar atmospheres; dust; stellar pulsation; hydrodynamics; radiative transfer;

   Sammanfattning : Asymptotic giant branch (AGB) stars are luminous cool giants of low to intermediate mass that are strongly pulsating and non-spherical, with heavy mass loss through a stellar wind. The mass loss makes these stars important for galactic chemistry, as the wind enriches the interstellar medium with new elements and dust, and it determines the final fate of these stars. LÄS MER

7. 5. Fire behaviour of selected polymeric materials : Numerical modelling and validation using microscale and bench scale test methods

   Författare :Abhishek Bhargava; Avdelningen för Brandteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DAEM; pyrolysis modelling; Polymer flammability; mass loss rate; Heat release rate HRR ;

   Sammanfattning : The ability to predict fire behaviour of materials is of key interest to building materials industry. Themain reason for it is expensive fire testing and certification costs borne by the manufacturers to bring a finished product to market. LÄS MER