778 research outputs found
Study on Turbulent Boundary Layer with Injection and Combustion
Results are presented of the calculation of the velocity field and of the experiments of mean profile measurements in the turbulent boundary layer with injection and combustion. The agreement between the present calculation, which is the extension of the Economos' method, and the experimental results of other investigators is not very good. Thus, the cause of this disagreement is discussed by making use of the results of the present measurements. Through further examination of the same experimental results, some characteristics of the flow are clarified, and the important points to be considered during future study are pointed out
Usefulness of three-dimensional computed tomography of the larynx for evaluation of unilateral vocal fold paralysis before and after treatment: technique and clinical applications
Laryngoplasty is well-known technique for unilateral vocal fold paralysis (UVFP). However, operation result are sometimes not as good as expected before surgery. Three-dimensional Computed tomography (3DCT) is useful for visualizing complicated intralaryngeal structures. Moreover, 3DCT is suited for analyzing the movement of the vocal fold and arytenoid cartilage because the technique is based on actual data from live patients. We have been used 3DCT of the Larynx for evaluation of UVFP before and after treatment. We uncovered some new findings about UVFP and reasons of unsatisfactory outcomes after operation. Technique and clinical applications of 3DCT for UVFP are outlined in this paper
Endoscopic Laser Treatment for Pediatric Nasal Allergy
We have used the carbon dioxide (CO2) laser and the gallium aluminium arsenide (GaAlAs) diode laser with flexible fiber delivery instruments for vaporization of the inferior nasal
turbinate in pediatric patients since 1993. Under endoscopic control, the whole inferior
turbinate was vaporized by 5–10 W laser output delivered via an optical fiber. Generally, the
nasal mucosa changes into normal mucosa, and symptoms improve. The greatest symptomatic
improvement was in nasal obstruction. The results obtained by the two laser devices
were similar although they have had different characteristics. Endoscopic laser surgery is
effective in the treatment of pediatric nasal allergy
Headache Associated with Myasthenia Gravis: The Impact of Mild Ocular Symptoms
Myasthenia gravis (MG) patients visiting outpatient clinics frequently complain of headache. However, there have been few reports on the relation between chronic headache and myasthenia gravis (MG). We aimed to investigate whether MG symptoms affect the development or worsening of chronic headache. Among the 184 MG patients who were followed at the MG clinics, tension-type headache was observed in 71 (38.6%) patients and 9 (4.9%) complained of migraine. Twenty-five (13.6%) complained that headache appeared or was exacerbated after the MG onset. The investigation into differences in the clinical characteristics of the MG patients showed that women tended to suffer from MG-associated headache more often than men. Logistic regression analyses revealed that female gender and mild ocular symptoms were independently predictive of headache associated with MG. Our results suggest that treatment of chronic headache should be required to improve the quality of life in MG patients
Influence of Substrate Surface Roughness on Synthesized Diamond Films by Flame Combustion on Ti Substrate for Dental Implants
The flame combustion method enables the synthesis of diamonds via acetylene-oxygen gas flame combustion in ambient air, and this method has various advantages over other methods. However, most diamond films synthesized by this method delaminate because of thermal stress during cooling. Titanium (Ti) has recently been utilized as a dental implant in the dental industry. In this study, to improve the strength, wear resistance, and biocompatibility of dental implant surfaces, diamond films were synthesized on a Ti substrate, a dental implant material, by the flame combustion method. Moreover, to obtain high-quality diamond films and achieve good adhesion on the Ti substrate, as a pretreatment of the substrate to prevent delamination, scratch processing, in which a substrate is ground with emery paper in one direction, was performed to roughen the surface. The surface roughness of the Ti substrates was varied by scratching with emery paper of #180, #400, and #1500 grain sizes. According to these results, diamond films were synthesized on the Ti substrate surface by flame combustion. The surface morphology of the synthesized films could be altered by varying the scratching process using emery paper. Delamination of the synthesized films during the scratching process with emery paper #180 (Case A) and #400 (Case B) grain size was completely prevented. However, delamination occurred during the scratching process with a grain size of emery paper #1500 (Case C). To investigate the reason for this result, the surface roughness of the pretreated Ti substrate was observed, and it affected the surface roughness of pretreated Ti substrate affected the surface morphology and delamination of the synthesized diamond films
Luminosity Functions of the Host Galaxies of Supernova
We present the luminosity functions and stellar mass functions of supernova
(SN) host galaxies and test if they differ from the functions of normal field
galaxies. We utilize homogeneous samples consisting of 273 SNe Ia ()
and 44 core-collapse (CC) SNe () from the Sloan Digital Sky Survey
(SDSS) II Supernova Survey and the high-signal-to-noise-ratio photometry of
galaxies from the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP). SN
hosts are classified into star-forming and passive galaxy groups based on the
spectral energy distribution (SED) fitting. We find that the SN host luminosity
functions and stellar mass functions deviate from those of normal field
galaxies. Star-forming galaxies dominate the low-mass end of the SN Ia host
mass function, while passive galaxies dominate the high-mass end. CC SNe are
predominantly hosted by star-forming galaxies. In addition, intermediate-mass
hosts produce CC SNe with the highest efficiency, while the efficiency of
producing SNe Ia monotonically increases as the hosts become more massive.
Furthermore, We derive the pseudo mass normalized SN rates (pSNuM) based on the
mass functions. We find that the star-forming component of pSNuM is less
sensitive to the changes in stellar mass, in comparison with the total rate.
The behavior of pSNuM suggests that the CC rate is proportional to the
star-forming rate
Characteristics of Gelation by Amides Based on trans-1,2-Diaminocyclohexane: The Importance of Different Substituents
Six diamides were prepared from trans-(1R,2R)-1,2-diaminocyclohexane and the corresponding racemate and were subsequently used as gelators. Three chiral compounds and their racemates were prepared. One of the chiral compounds and its racemate contained two n-dodecanoylamino groups as the same substituents. The other two chiral compounds and their racemates contained different substituents: 10-undecenoylamino and 2-heptyl-undecanoylamino groups, and 5-hydroxypentanoylamino and 2-heptylundecanoylamino groups. Their gelation abilities were evaluated on the basis of the minimum gel concentration using eight solvents. The thermal stability and transparency of the gels were investigated by UV-vis spectroscopy using three-component mixed solvents of hexadecyl 2-ethylhexanoate, liquid paraffin, and decamethyl cyclopentasiloxane (66 combinations). The gel-to-sol phase-transition temperatures were also studied. The viscoelastic behavior of the gels was studied by rheology measurements in the strain sweep mode. Aggregates constructing three-dimensional networks were studied by transmission electron microscopy and circular dichroism spectroscopy. The molecular packing of the gels was evaluated by small angle X-ray scattering (SAXS).ArticleBULLETIN OF THE CHEMICAL SOCIETY OF JAPAN.90(3):312-321(2017)journal articl
Clinical Course of Laryngeal Granuloma Without Surgical Treatment
Laryngeal granuloma is a rather common pathological entity, but its therapeutic strategy is
still controversial. In general, therapeutic strategy consists of medications such as steroids or
tranilast, in addition to vocal hygiene and surgery. Surgical removal is most commonly
performed. However, it has recently been reported that recurrence after surgery is high
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