Sökning: "skull"

Visar resultat 16 - 20 av 125 avhandlingar innehållade ordet skull.

  1. 16. A Finite Element Model of the Human Head for Simulation of Bone-conducted Sound

    Författare :You Chang; Stefan Stenfelt; Namkeun Kim; Frank Böhnke; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; bone conduction; finite element model，bone-conduction devices;

    Sammanfattning : Bone conduction is usually understood as the hearing sensation based on the vibrations of the skull bone and surrounding tissues. The fact that vibration of the skull bones can result in a sound percept has been known for a long time. However, it is difficult to give a general definition of BC sound. LÄS MER

  3. 17. Hearing by Bone Conduction. Physical and Physiological Aspects

    Författare :Stefan Stenfelt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Bone conduction as a phenomenon, physically and physiologically, is of vital importance in both the diagnosis of a hearing impairment and the development of bone conduction hearing aids. Understanding hearing by bone conduction is difficult, involving sound transmission by wave motion in a complex geometrical structure of layered bone covered with soft tissue and cartilage, finally received by the highly delicate cochlea. LÄS MER

  4. 18. The braincase of Youngolepis, a Lower Devonian crossopterygian from Yunnan, south-western China

    Författare :Mee-mann Chang; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fiskar; Paleozoologi;

    Sammanfattning : The endocranium and skull roof of Youngolepis, a Lower Devonian crossopterygian from south-western China, is described based on some 40 specimens of which one was investigated by serial grinding. In cranial structure Youngolepis Chang et Yu, 1981, shows affinity to Powichthys Jessen, 1975, from the Lower Devonian of the Canadian Arctic. LÄS MER

  5. 19. The Bone Conduction Implant (BCI) - Preclinical Studies, Technical Design and a Clinical Evaluation

    Författare :Hamidreza Taghavi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bone conduction implant; Amplitude modulation; Bone anchored hearing aid; Radio frequency power amplifier and inductive link; Long-term implantation.; Low-power systems; Implanted transducer;

    Sammanfattning : The Bone Conduction Implant (BCI) system has been developed as an alternative to the percutaneous bone anchored hearing aid (BAHA) with the advantage that the skin is kept intact. The transducer is permanently implanted and attached to the skull via a flat surface contact to the temporal bone. LÄS MER

  7. 20. Physical activity and regional bone mass

    Författare :Håkan Magnusson; Malmö Institutionen för kliniska vetenskaper; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; orthopaedics; Surgery; medial tibial stress syndrome; hip fracture; weight-loaded and unloded skeletal regions; physical activity; Bone mineral density; dual X-ray absorptiometry; ortopedi; Kirurgi; traumatology; traumatologi;

    Sammanfattning : This thesis considers the effect of physical activity on bone mass in weight-loaded and unloaded regions of the skeleton. Bone mass was measured by Dual X-ray Absorptiometry (DXA) and by Quantitative Ultrasound (QUS). LÄS MER