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Study to the Effect of Involutional Blepharoptosis Surgery Using Objective and Subjective Parameters
Shinichi Asamura,Yoshitaka Wada,Saiichi Tanaka,Shizuya Saika 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.4
Background We investigate the effect of involutional blepharoptosis (IB) surgery based on dry eye symptoms by analysis using objective and subjective measures. Methods We recorded various parameters from patients that underwent levator advancement surgery for IB, totaling 125 eyes (total 65 patients, 5 unilateral, 60 bilateral). Subjective assessment comprised a questionnaire on dry eye-related quality of life score (DEQS), a summary score calculated from DEQS, and six-grade evaluation, the patient’s own measure of eye comfort. Objective assessment comprised marginalreflex distance-1 (MRD-1), measurement of tear film breakup time, and superficial keratopathy (SPK) existence by slit lamp microscope. Results Subjective assessments showed that IB patients had improvement of dry eye symptoms and eye comfort when surgery increased MRD-1. On the other hand, objective assessments showed that the presence of SPK is suspected when the postoperative MRD-1 level is 3mm or higher. Conclusion IB surgery must not only increase MRD-1 value, but also to perform maintenance of the appropriate ocular surface condition. From our parameters, we suggest postoperative MRD-1 value should be maintained at<3mm to safe and effective of IB surgery.
Microstructure Control of Grain-oriented Barium-titanate Ceramics and Their Piezoelectric Properties
Petr Pulpan,Rintaro Mori,Hiroshi Hayashi,Yoshitaka Nagamori,Yuichi Yamamoto,Satoshi Wada 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
A templated grain growth (TGG) method was used for the preparation of grain-oriented bariumtitanate (BaTiO3, BT) ceramics. [110]-oriented BT plate-like template particles were dispersed in a matrix of hydrothermal BT spherical particles of various sizes. The Lotgering method using the Xray diffraction (XRD) pattern determined the degree of orientation along the [110] direction (F110). An optimization of the preparation conditions was performed in terms of the template-to-matrix weight ratio (T/M), the Ba/Ti ratio, and the sintering temperature and time in order to achieve a high F110 along with a small grain size and a high density. A grain size as small as 10 µm could be reached for Ba/Ti ratios close to the stoichiometric value. Lower values led to an increase in F110 and in the grain size. A T/M bigger than 80% was necessary for F110 to be above 80% and for the grain size lower than 40 µm. The density was almost independent of the T/M and the Ba/Ti ratios. The grain growth was limited by a two-step sintering process. Small grain size, high F110 and high density are essential if the piezoelectric constant d33 is to be increased above the values for standard BT ceramics.
Onigiri Esophagography as a Screening Test for Esophageal Motility Disorders
( Shohei Hamada ),( Eikichi Ihara ),( Kazumasa Muta ),( Masafumi Wada ),( Yoshitaka Hata ),( Hiroko Ikeda ),( Yoshimasa Tanaka ),( Haruei Ogino ),( Takatoshi Chinen ),( Yoshihiro Ogawa ) 대한소화기기능성질환·운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.1
Background/Aims No screening test for esophageal motility disorder (EMD) has been established, the objective of this study is to examine the potential usefulness of our newly developed “Onigiri esophagography” combined with an obstruction level (OL) classification system in screening for EMD. Methods A total of 102 patients with suspected EMDs who underwent both high-resolution manometry (HRM) and Onigiri esophagography between April 2017 and January 2019 were examined. The EMD diagnosis was performed based on the Chicago classification version 3.0 by HRM. Onigiri esophagography was performed using a liquid medium (barium sulfate) followed by a solid medium, which consisted of an Onigiri (a Japanese rice ball) with barium powder. The extent of medium obstruction was assessed by the OL classification, which was defined in a stepwise fashion from OL0 (no obstruction) to OL4 (severe obstruction). Results The patients with OL0 (32.3%), OL1 (50.0%), OL2 (88.0%), OL3 (100.0%), and OL4 (100.0%) were diagnosed EMDs by HRM. The area under the curve, as determined by a receiver operating characteristic analysis, for the OL classification was 0.86. Using the cutoff value of OL1, the sensitivity and specificity were 87.3% and 61.3%, respectively, while using a cutoff value of OL2, the sensitivity and specificity were 73.2% and 90.3%, respectively. Conclusion In conclusion, Onigiri esophagography combined with the OL classification system can be used as a screening test for EMDs with a cutoff value of OL1. (J Neurogastroenterol Motil 2022;28:43-52)
X-Ray Imaging and Measurement of Cavitation Flow in Fuel Injector Nozzles with Various Geometries
( Rubby Prasetya ),( Takumi Kasahara ),( Kazuya Kotani ),( Takashi Miwa ),( Akira Sou ),( Seoksu Moon ),( Yoshitaka Wada ),( Yoshiharu Ueki ),( Hideaki Yokohata ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
Studies of in-nozzle cavitation are commonly carried out by conducting visualization experiments with optically accessible nozzle and visible spectrum light sources. However, multiple scattering occurs at the interface of in-nozzle cloud cavitation and discharged liquid jet, which prevents image acquisition of clear cavitation profile and liquid jet. In this study, X-Ray Phase Contrast Imaging (XPCI) is utilized to obtain a clear image of cavitation in several two-dimensional nozzles, as well as the discharged liquid jet of each nozzle. The XPCI was conducted at SPring-8 synchrotron light source. The nozzles used in this study have a width of 1 mm, with ratio of length and width LAV = 4. Upstream geometries of the nozzle are varied, with symmetrical and mini-sac upstream geometries. As a result, we can clearly capture the development of cavitation in the nozzle, from the start of nucleation to the formation of cavitation film in the nozzle. While cavitation film on symmetrical nozzle are relatively stable, mini-sac nozzle produces unstable cavitation film which moves laterally relative to the streamwise direction. The XPCI method also makes it possible to visualize individual bubbles in cloud cavitation, which clarified the collapse and rebound process of cavitation bubble. Finally, visualization of discharged jet from the nozzle under different cavitation regimes prove that wavy structure of the jet’s interface also becomes finer in accordance with cavitation growth in the nozzle.
String Cavitation and 3D PIV in Multi-Hole Injector
( Hiroaki Nakano ),( Rubby Prasetya ),( Shinichiro Deguchi ),( Takashi Miwa ),( Akira Sou ),( Keiya Nishida ),( Akira Nakashima ),( Yoshitaka Wada ),( Yoshiharu Ueki ),( Hideaki Yokohata ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
It is essential to control fuel spray characteristics in diesel engines for cleaning up exhaust gases and improving combustion efficiency. Turbulent cavitating flow in fuel injectors plays an important role in fuel spray characteristics. String cavitation may occur in a sac and nozzles of multi-hole fuel injectors, which strongly affects fuel spray characteristics. It should be caused by the vortex flow in the sac. However, the occurrence mechanism of string cavitation has not been clarified yet. The purpose of this study is to clarify the mechanism and condition of string cavitation occurrence by conducting a high-speed visualization experiment in a transparent injector of cavitation and a discharged liquid jet at various needle lifts and flow rates. We also measure the three-dimensional flow field in the sac by 3D PIV. The transparent acrylic multi-hole mini-sac nozzle is designed to visualize cavitation. Sodium iodide aqueous solutions or diesel oil with α-methyl naphthalene is used as a working fluid to avoid the refraction at the surface of the acrylic walls and these liquids. As a result, it is found that at low needle lift string cavitation often occurs which is surrounded by a vortical flow in the sac and increases the discharged hollow-cone liquid jet angle, while at high needle lift thin and short string cavitation may occur, which does not strongly influence discharged liquid jet and spray. The probability of the string cavitation appearance under various conditions as well as the transient motion of string cavitation and liquid jet is also clarified.