Search for dissertations about: "barrier pressure"

Showing result 1 - 5 of 105 swedish dissertations containing the words barrier pressure.

  2. 1. The Influence of Atmospheric Turbulence on Barrier Sound Reduction

    Author : Jens Forssén; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; traffic noise; barrier; measurements; turbulence; scattering cross-section; substitute sources; outdoor sound propagation; parabolic equation method; random media; numerical modelling;

    Abstract : Numerical modelling and measurements are used for studying the reduced performance of a noise barrier, caused by a turbulent atmosphere. The turbulence scatters the sound, which leads to an increased noise level in the acoustic shadow region behind the barrier. READ MORE

  4. 2. Effects of anasthesia on esophageal sphincters

    Author : Rebecca Ahlstrand; Magnus Wattvil; Johan Ullman; Örebro universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Lower esophageal shincter; Upper esophageal sphincter; Barrier pressure; Manometry; Propofol; Remifentanil; Alfentanil; Rocuronium; Cricoid pressure; MEDICINE; MEDICIN; Surgery; Kirurgi; Anaesthetics; Anestesiologi; Anaesthesiology; Anestesiologi;

    Abstract : The esophageal sphincters constitute the anatomical protection against pulmonary aspiration. The aim of this thesis was to study the esophageal sphincters and how they are affected by different components of emergency anesthesia using high-resolution solid-state manometry.The effect of propofol (0. READ MORE

  5. 3. Taking Pressure of Anaplastic Thyroid Carcinoma : Molecular Studies of Apoptosis and Interstitial Hypertension

    Author : Pernilla Roswall; Nils-Erik Heldin; Kristofer Rubin; Sven Påhlman; Uppsala universitet; []
    Keywords : Medicine; Anaplastic thyroid carcinoma; Apoptosis; Cre recombinase; 2-Methoxyestradiol; Transforming growth factor-β; Transgenic mouse; Tumor-associated macrophages; Tumor interstitial fluid pressure; Medicin;

    Abstract : Molecular mechanisms in the development and progression of thyroid carcinomas are still not fully understood. In the present thesis the highly malignant anaplastic thyroid carcinoma (ATC) was used to study regulation of apoptosis and tumor interstitial fluid pressure (IFP). READ MORE

  6. 4. Effects of anesthesia on esophageal sphincters in obese patients

    Author : Alex de León; Magnus Wattwil; Ola Stenqvist; Örebro universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Lower esophageal sphincter; upper esophageal sphincter; barrier pressure; obesity; high-resolution solid-state manometry; anesthesia; MEDICINE; MEDICIN; Surgery; Kirurgi; Anaesthetics; Anestesiologi; Surgery; Kirurgi; Anaesthesiology; Anestesiologi;

    Abstract : The lower esophageal sphincter (LES) and the upper esophageal sphincter (UES) play a central role in preventing regurgitation and aspiration. The aim of this thesis was to evaluate the UES, LES, esophageal (E) and barrier (Br) pressures (P) using high resolution solid state manometry (HRSM). READ MORE

  7. 5. Characterization of WC-Co tools used for machining of Alloy 718 under the influence of high-pressure coolant supply

    Author : Philipp Hoier; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; erosion; surface-modifications; High-pressure coolant supply; Alloy 718; tool wear; vapor-barrier;

    Abstract : The use of high-pressure jets for supply of coolant to the cutting zone has the potential to significantly increase the productivity and process stability when machining difficult-to-cut materials such as Ni-based superalloys. Apart from better chip-breakability, the jets enable the coolant to reach closer to the cutting edge and hence enhance its capability to dissipate heat. READ MORE