Sökning: "line source model"

Visar resultat 6 - 10 av 135 avhandlingar innehållade orden line source model.

  1. 6. A Signal Processing Approach to Practical Neurophysiology : A Search for Improved Methods in Clinical Routine and Research

    Författare :Björn Hammarberg; Dick Stegeman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Systemteknik; matched filter; asynchronous detection; Kalman filter; initialization; MHT; Wiener deconvolution; line source model; electromyography; needle EMG; motor unit potential; MUAP; mean fiber concentration; jitter; microneurography; C-fiber; spike sorting; Systemteknik; Systems engineering; Systemteknik; Signal Processing; signalbehandling;

    Sammanfattning : Signal processing within the neurophysiological field is challenging and requires short processing time and reliable results. In this thesis, three main problems are considered.First, a modified line source model for simulation of muscle action potentials (APs) is presented. LÄS MER

  3. 7. Towards Model-Based Condition Monitoring of Railway Switches and Crossings

    Författare :Marko Milosevic; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sleeper void; Switches crossings; condition indicators; embedded sleeper accelerometer; multi-body simulations; dynamic vehicle–track interaction; MBS; S C; wheel–rail contact forces; condition monitoring; crossing rail geometry; displacement reconstruction.; model calibration;

    Sammanfattning : Railway switches and crossings (S&C, turnouts) connect different track sections and create a railway network by allowing for trains to change between tracks. This functionality comes at a cost as the load-inducing rail discontinuities in the switch and crossing panels cause much higher degradation rates for S&C compared to regular plain line track. LÄS MER

  4. 8. Modelling and control of a line-commutated HVDC transmission system interacting with a VSC STATCOM

    Författare :Paulo Fischer de Toledo; Hans-Peter Nee; Gustaf Ohlsson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Keywords : HVDC transmission; LCC – Line-commutated Current-source Converter; STATCOM; VSC – Voltage Source Converter; Space-Vector complex vector ; transfer-function; frequency-domain analysis; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

    Sammanfattning : The interaction of an HVDC converter with the connected power system is of complex nature. An accurate model of the converter is required to study these interactions. The use of analytical small-signal converter models provides useful insight and understanding of the interaction of the HVDC system and the connected system components. LÄS MER

  5. 9. Health for community dwelling older people : trends, inequalities, needs and care in rural Vietnam

    Författare :Le Van Hoi; Lars Lindholm; Truong Viet Dung; Pham Thang; Nguyen Thi Kim Chuc; Zarina Kabir; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; older people; elderly health; health status; life expectancy; health-related quality of life; EQ-5D; mobility; self-care; usual activities; pain; discomfort; anxiety; depression; activity of daily living; basic ADL; instrumental ADL; intellectual ADL; non-communicable diseases; need of care; health service; model of care; mobile team; day care centre; nursing centre; inequalities; cost of care; socioeconomic; education; marital status; living arrangement; household head; working status; living area; wealth quintile; poverty line; community; cohort study; household survey; focus group discussion; qualitative research; rural; Vietnam; developing country; Asia; người cao tuổi; y tế; thực trạng sức khỏe; hy vọng sống; chất lượng cuộc sống; EQ-5D; đi lại; tự chăm sóc; hoạt động thường xuyên; đau; khó chịu; lo lắng; trầm cảm; hoạt động hàng ngày; bệnh không lây nhiễm; nhu cầu chăm sóc; dịch vụ y tế; mô hình chăm sóc; đội lưu động; trung tâm chăm sóc ban ngày; trung tâm dưỡng lão; bất bình đẳng; chi phí chăm sóc; kinh tế xã hội; giáo dục; hôn nhân; sắp xếp cuộc sống; chủ hộ; tình trạng làm việc; khu vực sống; ngũ phân thịnh vượng; chuẩn nghèo; cộng đồng; nghiên cứu theo dõi dọc; điều tra hộ gia đình; thảo luận nhóm tập trung; nghiên cứu định tính; nông thôn; Việt Nam; nước đang phát triển; châu Á; folkhälsa; Public health;

    Sammanfattning : Background InVietnam, the proportion of people aged 60 and above has increased rapidly in recent decades. The majority live in rural areas where socioeconomic status is more disadvantaged than in urban areas.Vietnam’s economic status is improving but disparities in income and living conditions are widening between groups and regions. LÄS MER

  7. 10. Intermodulation Distortion in Active and Passive Components

    Författare :Martin Mattsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Intermodulation distortion; hyperabrupt junction; polynomial model; passive intermodulation; nonlinear analysis; loaded-line phase shifter; varactor modeling;

    Sammanfattning : Wireless communication is growing rapidly, and the demand for higher data rate, low latency, and availability leads to a more complex infrastructure with new challenges. Multiple communication systems have to co-exist in a densely populated frequency-spectrum, where higher power levels and more sensitive receivers are required. LÄS MER