A5071227005- Geophysics and Gravity Measurements
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- GNSS positioning and interference
- Ear Surgery and Otitis Media
- Solar and Space Plasma Dynamics
- Semiconductor Quantum Structures and Devices
- Geomagnetism and Paleomagnetism Studies
- Geophysical and Geoelectrical Methods
- Ear and Head Tumors
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Software Testing and Debugging Techniques
- Reconstructive Facial Surgery Techniques
- Formal Methods in Verification
- Methane Hydrates and Related Phenomena
- Advanced Optical Sensing Technologies
- Laser Material Processing Techniques
- Optical Coatings and Gratings
- Nasal Surgery and Airway Studies
- Astro and Planetary Science
- Soil Moisture and Remote Sensing
- Nanofabrication and Lithography Techniques
- Congenital gastrointestinal and neural anomalies
Tampere University
2011-2024
University of Helsinki
1983-2024
Finnish Geospatial Research Institute
2004-2018
Tampere University of Applied Sciences
2011-2018
Finnish Meteorological Institute
2010
Biocenter Finland
2007
Helsinki Institute of Physics
2006
Geological Survey of Finland
2006
Tampere University Hospital
1992
South Karelia Central Hospital
1989
The sound conduction method for measurement of the Eustachian tube opening has been studied and modifications made in test procedure to increase its easy performance reliability. By holding source near nostril, mounting microphone into a circumaural ear defender by feeding output through filter with very narrow bandwidth (3.16 Hz) many pitfalls technique described earlier could be removed. Recording transfer function between nasal tip external auditory meatus recording spectrum swallowing...
This letter presents narrow-linewidth 780-nm edge-emitting semiconductor DFB lasers fabricated without re-growth using UV-nanoimprinted surface gratings. The third-order laterally coupled ridge-waveguide gratings enable single mode operation, excellent spectral purity (40-55 dB side suppression ratio and 10-kHz linewidth), good light-current-voltage characteristics in continuous wave operation (~112-mA threshold current, ~1.55-V opening voltage, 28.9-mW output power from one facet at 300-mA...
Background & AimsRET, the receptor for glial cell line–derived neurotrophic factor (GDNF) family ligands, is most frequently mutated gene in congenital aganglionic megacolon or Hirschsprung's disease (HSCR). The leading cause of mortality HSCR HSCR-associated enterocolitis (HAEC), which characterized by altered mucin composition, retention, bacterial adhesion to enterocytes, and epithelial damage, although order these events obscure. In mice, loss GDNF signaling leads a severely...
• Thirteen patients (16 ears) with patulous eustachian tubes were treated pterygoid hamulotomy combined transposition (eight or transection of the tendon tensor veli palatini muscle. Tubal function was tested preoperatively and postoperatively by sonotubometry. Prior to surgery, only one ear showed normal tubal on swallowing at time test. The follow-up period ranged from two months five years. Nine ears yielded sonotubometric results during average years, while opened swallowing, remained...
Abstract If we restrict the spatial resolution to a half-wavelength of about 1500 km and temporal 1 month, GRACE-derived gravity variations can be resolved within μgal (10 -8 m/s2) range. A comparison with ground measurements from selected Superconducting Gravimeter (SG) stations forming Global Geodynamics Project (GGP) provides an independent validation. For this study, five European SGstations were that both cover large test field allow closely located SG-stations studied. Prior...
Twenty-five patients (31 ears) with pathologically patent Eustachian tubes are presented and the symptoms analysed. All ears were examined by sonotubometry two different opening patterns could be separated for patulous tube. The variations in impedance of ear during respiration recorded from nearly all three eardrum perforation also investigated means airpressure equalization method. Only brought out clearly tube examined. It is thus a useful addition diagnosing abnormal patency following up...
Specimens of middle ear effusion and adenoid tissue were studied for bacteria pneumococcal capsular antigen in 107 patients with secretory otitis media. 120 163 samples (73.6%) negative on bacterial culture. Hemophilus influenzae was present 9.2% Streptococcus pneumoniae 1.8%. cultured from 44.8% 35.5% specimens. Free demonstrated 10.4% the fluids this figure rose to 23% when liberated immune complexes by heating. The corresponding figures suspension 27.1% 39%. or lymphoid entire oropharynx...
We present the results of an evaluation where we studied effectiveness automatic test generation for graphical user interface (GUI) testing smartphone applications. To describe context our evaluation, tools and model library have developed are also presented. The contains models basic S60 applications, such as camera, contacts, etc. include on-line generator that produces sequences so called keywords to be executed on targets. In managed find over 20 defects from applications had been market...
We report narrow-linewidth 1180-nm GaInNAs/GaAs distributed Bragg reflector lasers reaching up to ~500-mW continuous-wave output power at room temperature. The employ surface gratings, which avoided the problematic regrowth and enabled a high side-mode suppression ratio over relatively large mode-hop-free tuning range. wavelength rates of 0.1 nm/°C 1 pm/mA were obtained by changing mount temperature drive current, respectively. exhibit narrow emission linewidth (<;250 kHz) even levels. is...
The Eustachian tube function was tested pre-operatively by sonotubometry and the negative pressure equalization test in 87 ears subjected to simple myringoplasty. tympanoplasty alone, or combined with mastoid surgery. relations between tubal results healing were analysed on average 10 months after operation. indicating absent partial ability poorly correlated successful outcome of surgery, while showed a good correlation. Pressure may produce such an unphysiological underpressure that many...
We report the development of superluminescent diodes (SLDs) emitting mW-level output power in a broad spectrum centered at wavelength 2.55 μm. The structure consists two compressively strained GaInAsSb/GaSb-quantum wells placed within lattice-matched AlGaAsSb waveguide. An average more than 3 mW and peak 38 are demonstrated room temperature under pulsed operation. A cavity suppression element is used to prevent lasing high current injection allowing emission with full width half maximum...
We study the influence of non-tidal loading by Baltic Sea on GNSS daily coordinate time series. The momentary sea surface is estimated from hourly tide gauge recordings around and load convolved with Green's functions to determine 3-D deformation, gravity, potential tilt effects at 193 stations Baltic. This paper concentrates deformation a small number continuous stations. Daily series based both Precise Point Positioning (PPP) double differences (DD) were used. find that for east component...
The results of myringoplasty on 172 ears examined after an average follow-up time 1.5 years are reported. fascial underlay technique with swing-door plasty was employed in 78% the cases. graft take successful 150 (87%), three which (2%) later revealed adhesive changes middle ear. Three were reoperated, percentage healed perforations being 89. A high tone hearing loss occurred two and a moderate flat sensorineural another (2%). Successful obtained 92% operations performed by specialists 59%...
• Opinions differ whether simple myringoplasty should be combined with mastoidectomy, which is claimed to provide a large air reservoir for the middle ear. Data are reported on 61 ears, 55 of had reasonably normal tympanic mucosa but distinct chronic mastoid or epitympanic ear disease. Obliteration cavity was performed, tympanoplasty, and patients were followed up an average three years. Normal aeration seen in all cases regardless posterior canal wall saved reconstructed connection...
Current development trends concerning miniaturizing of electronics and photonics systems are aiming at assembly 3D co-integration a broad range technologies including MEMS, microfluidics, wafer level optics, multilayered structures with through-silicon vias connection, silicon photonics. Modern integration processes impose severe requirements on the design functionality research setups their parts. In this work we demonstrate simple, reliable, cost-effective reconfigurable vacuum sample...
The feasibility of using labetalol, an alpha‐ and beta‐adrenergic blocking agent, as a hypotensive agent in combination with inhalation anaesthetics (halothane, enflurane or isoflurane) was studied 23 adult patients undergoing middle‐ear surgery. mean arterial pressure decreased from 86 ± 5 (s.e. mean) mmHg to 52 1 (11.5 0.7 6.9 0.1 kPa) for 98 10 min the halothane (H) group, 79 53 (10.5 7.1 129 11 (E) 80 4 49 (10.7 0.5 6.5 135 15 isoflurane (I) group. H concentration during hypotension...