Sökning: "critical pressure"

Visar resultat 1 - 5 av 350 avhandlingar innehållade orden critical pressure.

  1. 1. On the inception of leakage : Effect of hydrostatic pressure on the sealing interface

    Författare :De Huang; Andreas Almqvist; Roland Larsson; Xiang Yan; Alessandro Ruggiero; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; static seal; contact mechanics; hydrostatic; critical pressure; leakage; Maskinelement; Machine Elements;

    Sammanfattning : As the move towards sustainability continues,  attention needs to be paid to the development of new machinery with high performance and low environmental impact. It places increasing demands on low/zero-emission sealing with a long lifetime. LÄS MER

  3. 2. Flow, expansion and processing behaviours of gas-containing filled polyethylene

    Författare :Nabil Khoshaba; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical properties; flow rate; critical pressure; injection moulding; expansion kinetics; fillers; rheological properties; foaming; composite materials; partial pressure; capillary viscometry; Blowing agent;

    Sammanfattning : The utilization of fillers in polymeric materials has exhibited a substantial growth during the last decades. Chalk (calcium carbonate) and glass fibres are two common examples of such fillers. These fillers/reinforcing elements are used in order to reduce the cost of material and change its physical (mechanical) properties. LÄS MER

  4. 3. Macroscopic Volume and Free Volume of Polymer Blends and Pressure-densified Polymers

    Författare :Marcus Schmidt; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; free-volume theories; refractive index; Lorentz-Lorenz equation; loss tangent; Avrami equation; freezing fractions; copolymers; polymer blends; pressure dilatometry; Tait equation of state; free-volume distributions; pressure-densified polymers; entropy of melting; dynamic-mechanical analysis; positronium; positron annihilation; free volume; cavity size; polymers; bulk modulus; PVT; phase separation; compressibility; thermal expansivity;

    Sammanfattning : The macroscopic volume V as a function of pressure P and temperature T is obtained from PVT measurements. PVT data is sensitive to the state of polymers and changes therein. Moreover, PVT data gives access to the free-volume fraction. LÄS MER

  5. 4. Omsorgsarbetets vardag och villkor i Sverige och Danmark : Ett feministiskt kritiskt perspektiv

    Författare :Anneli Stranz; Marta Szebehely; Evy Gunnarsson; Tine Rostgaard; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; care work; eldercare; working conditions; body work; gender justice; Social Work; socialt arbete;

    Sammanfattning : The present study analyses the welfare state as employer by studying eldercare workers’ experiences of their work in Sweden and Denmark.  The Nordic welfare states are often described as potentially women-friendly due to the availability of publicly provided services that enable women to combine paid work and caring responsibilities. LÄS MER

  7. 5. Unga idrottares upplevelser av föräldrapress

    Författare :Christian Augustsson; Göran Patriksson; Annica Löfdahl; Lars-Magnus Engström; Karlstads universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Children and youth; sport milieu; parental pressure; Education; Pedagogik; Pedagogik; Pedagogy;

    Sammanfattning : Over the last decades intense debates have taken place, in the mass media, regarding the child-parent relation within sport. Questions have been raised if parent’s involvement can be a source of pressure for children and youth. In Sweden relatively little research have been undertaken to study this problem. LÄS MER