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Study of the Oral Discomfort and Oral Habits in Halitosis Patient
Toshiyuki Shimizu,Mie Tashiro,Michael W. Myers,Kohji Takahashi,Shun-Ichi Honda 대한예방치과학회 2012 International Journal of Clinical Preventive Denti Vol.8 No.1
Objective: Purpose of this study was to clarify the relationship between oral discomfort, oral habits and halitosis. Methods: One hundred and forty patients with halitosis (age range, 13 to 65 years; 93 women, 47 men) who had visited Shimizu dental clinic from October 2003 to August 2008 were compared with a control group who did not have complaints about halitosis (n=56). Oral discomfort (such as sensation of dry mouth and discomfort of the tongue), the amount of saliva secretion, and oral habits (such as bruxism) were analyzed statistically between the halitosis and control group. To compare the halitosis patients with the control group, the Wilcoxon signed-ranks test was used for the analysis of the salivary amount, and a chi-Square test was used for the analysis of oral discomfort and oral habits. Results: Frequency of oral discomfort mouth sensation was significantly higher (p<0.0001) in the halitosis patients (63.5%) than in the control group (10.7%). The occurrence of oral habit was significantly higher (p<0.001) in the halitosis patients (63.6%) than in the control group (37.5%). There was a significant difference (p=0.0009) between the halitosis patients (mean: 1.28 ml) and control group (mean: 1.43 ml) in the amount of unstimulated saliva secretion. For the amount of stimulated saliva secretion, there was no significant difference (p=0.2248) between the halitosis patients (mean: 3.40 ml) and control group (mean: 3.76 ml). Conclusion: These results suggest that the presence of oral discomfort and oral habits, such as bruxism, were associated with halitosis.
Effect of Compression Overload on Fatigue Strength Improved by ICR Treatment
Toshiyuki Ishikawa,Masaru Shimizu,Hajime Tomo,Hirotaka Kawano,Kentaro Yamada 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
ICR (Impact Crack-closure Retrofit) treatment was developed for extending fatigue life of cracked steel structures by closing the fatigue crack opening. By applying the ICR treatment to as-welded condition, compressive stress remains at weld toe. Therefore, ICR treatment can be used for the improvement of fatigue strength of welded joint at the same level of the other fatigue strength improved techniques. If a compression overload is subjected after ICR treatment, however, the residual compressive stress at weld toe will shift the tensile stress region. Accordingly, improved fatigue strength of welded joints by ICR treatment will be reduced after the compression overloaded. In order to investigate the effect of the compression overload on fatigue strength improved by ICR treatment, fatigue tests of out-of-plane gusset specimens were carried out. As the results,fatigue strength improved by ICR treatment was hardly reduced under the compression overload condition of nominal stress of −190 MPa.
Vortex Cavitation from Baffle Plate and Pump Vibration in a Double-Suction Volute Pump
Sato, Toshiyuki,Nagahara, Takahide,Tanaka, Kazuhiro,Fuchiwaki, Masaki,Shimizu, Fumio,Inoue, Akira Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
This study highlights especially the mechanism of vortex cavitation occurrence from the end of the suction duct in a double-suction volute pump and pump oscillation which causes cavitation noise from the pump. In this study, full 3D numerical simulations have been performed using a commercial code inside the pump from the inlet of suction duct to the outlet of delivery duct. The numerical model is based on a combination of multiphase flow equations with the truncated version of the Rayleigh-Plesset model predicting the complicated growth and collapse process of cavity bubbles. The experimental investigations have also been performed on the cavitating flow with flow visualization to evaluate the numerical results.
Experimental Study on Ultimate Strength of Concrete Filled Double Tubular Steel with Shear Connector
Masaru Shimizu,Fumihito Tatsumi,Toshiyuki Ishikawa,Atsushi Hattori,Hirotaka Kawano 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
Concrete Filled Tubular steel (CFT) member, which represents a superb deformability due to well-known confined effectbetween steel tube and concrete, has been used mainly as bridge pier. As a progressive composite member, Concrete FilledDouble tubular steel (CFDT), which is consist of double skin steel tubes and filled concrete between them, has been proposed. Although a lot of reports on mechanical characteristics of the CFDT member are presently published, the necessity of shearconnector for the CFDT member has not been addressed. In this research, the shear connector was installed at the interfacebetween tubes and concrete in the CFDT member. To investigate the effect of the shear connector on the bending characteristics,the four points bending test were carried out. The results show that integrating the steel tubes and concrete enhances its bearingcapacity. Furthermore, the strains of outer and inner tubes were also discussed in this paper.
SOME FORMULAS FOR THE GENERALIZED HARDIE-JANSEN PRODUCT AND ITS DUAL
Oda, Nobuyuki,Shimizu, Toshiyuki Korean Mathematical Society 1999 대한수학회지 Vol.36 No.3
The generalized Hardie-Jansen product and its dual are defined and the fundamental results on these products are obtained. By studying the adjoint maps, we give proofs to them. Moreover we characterize the generalized Hardie-jansen product making use of the ${\Gamma}W$-Whitehead product. We also obtain a characterization of the dual of the generalized Hardie-Jansen product using $({\Gamma}W)$-Whitehead product.
Keerthi Katam,Debraj Bhattacharyya,Satoshi Soda,Toshiyuki Shimizu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
In this study, the efficiency of a trickling photo-bioreactor (TPBR), seeded with activated sludge andmicroalgae, was evaluated for domestic wastewater treatment. TPBR was operated completely on naturalaeration at 2-, 4-, and 6-h hydraulic retention time (HRT) with a 12:12 h light: dark cycle. The totalorganic carbon (TOC) and total nutrient (TN) removal were negatively affected by decreasing the HRTfrom 6 to 2 h. The TPBR was able to reduce TOC from 93 to 9 mg/L, TN from 34 to 18 mg/L, and phosphorusfrom 23.5 to 4 mg/L at 6-h HRT. The chlorophyll concentration (5 – 7 mg per liter of sponge volume)was observed to be highest in the middle of the reactor. Altogether, 106 organic micropollutants of differentclasses like pharmaceutical, personal care products, pesticides, herbicides, and fungicides weredetected in the influent wastewater sample. However, in the treated effluent, only 17 micropollutantswere detected at 6-h HRT. This shows that the algal-bacterial consortia are capable of removing micropollutantsfrom wastewater. The energy input was 0.06 kWh/kg COD removed which is much less than theconventional activated sludge processes. The results indicate that this novel system is capable of providinga sustainable wastewater treatment solution.
EMISSION LINE VELOCITY FIELD OF THE MAGELLANIC IRREGULAR GALAXY NGC 4449
SASAKI MINORU,OHTANI HIROSHI,SAITO MAMORU,OHTA KOUJI,YOSHIDA MICHITOSHI,SHIMIZU TASUHlRO,KOYANO HISASHI,KOSUGI GEORGE,AOKI KENTARO,SASAKI TOSHIYUKI The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
The imaging spectroscopic observations of the Magellanic irregular galaxy NGC 4449 were made to show the detailed kinematic structure of the galaxy. Many filamentary structures and Several bubble-like structures are recognized in a 3D data cube of H$\alpha$ emission line. Velocity field shows the kpc-scale mosaic structure and counter- rotation of ionized gas.
Tumor necrosis factor-α converting enzyme is a key mediator of abdominal aortic aneurysm development
Kaneko, Hidehiro,Anzai, Toshihisa,Horiuchi, Keisuke,Kohno, Takashi,Nagai, Toshiyuki,Anzai, Atsushi,Takahashi, Toshiyuki,Sasaki, Aya,Shimoda, Masayuki,Maekawa, Yuichiro,Shimizu, Hideyuki,Yoshikawa, Tsu Elsevier 2011 Atherosclerosis Vol.218 No.2
<P><B>Abstract</B></P><P><B>Objective</B></P><P>Tumor necrosis factor (TNF)-α is known to be elevated in plasma and the aorta in abdominal aortic aneurysm (AAA) patients. We sought to clarify the role of TNF-α converting enzyme (Tace), which cleaves the transmembrane precursor of TNF-α, in AAA development.</P><P><B>Methods</B></P><P>We obtained aortic sample of AAA during surgical operation to assess the histological features and protein expression of human AAA. AAA was induced in mice with temporal systemic deletion of Tace by the inducible Mx-1 Cre transgene (TaceMx1) and in wild-type littermates (CON) by periaortic application of CaCl<SUB>2</SUB> (AAA/TaceMx1, AAA/CON).</P><P><B>Results</B></P><P>Tace expression was increased in human AAA samples as compared with normal aorta. Six weeks postoperatively, aortic diameter in AAA/TaceMx1 was decreased than in AAA/CON in association with attenuated TNF-α expression and extracellular matrix disruption. Increased activities of matrix metalloproteinase (MMP)-9 and MMP-2, numbers of Mac-2-positive macrophages, CD3-positive T lymphocytes and CD31-positive vessels in periaortic tissues, mRNA expression of CD68, monocyte chemotactic protein-1, TNF-α, vascular endothelial growth factor-A, p47 and glutathione peroxidases, and protein expression of phospho-c-Jun N-terminal kinase in AAA were all attenuated by Tace deletion. Protein expression of transforming growth factor (TGF)-β1 was upregulated by Tace deletion in sham-operated mice. TGF-β1 expression was further increased in AAA/TaceMx1.</P><P><B>Conclusions</B></P><P>Tace was overexpressed in the aortic wall in human and experimental AAA. Temporal systemic deletion of Tace prevented AAA development in association with attenuating inflammation, oxidative stress, neoangiogenesis and extracellular matrix disruption, suggesting a crucial role of Tace in AAA development.</P>