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- 저자 : Sugimori Hiroyuki (검색결과 2 건)
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Heng Ma,Jun Xu,Hiroyuki Okada,Hiroyoshi Onnagawa,Sigeru Sugimori,Kazuhisa Toriyama 한국물리학회 2013 Current Applied Physics Vol.13 No.5
This paper describes an experimental investigation for physical properties of fluorinated phenyl bicyclohexane liquid crystals (LCs) mixtures. Measurements are reported of the large anisotropic dielectric properties of two structurally similar LCs (1,2-difluoro-4-[trans-4-(trans-4-propylcyclohexyl)cyclohexyl]benzene and 1-cyano-2-fluoro-4-[trans-4-(trans-4-propylcyclohexyl) cyclohexyl] benzene) mixed with a zero dielectric anisotropic LC (1-methyl-2-fluoro-4-[trans-4-(trans-4-ethylcyclohexyl) cyclohexyl]benzene). The results indicate that the mixing proportions strongly influence the dielectric constants along with the longer molecular axis. For two samples which is made from meta-para- or meta-fluorine substituted molecules, the temperature dependence of the anisotropic dielectric striking resemble that of a unitary compound with para-fluorine substituted. The threshold voltage of the mixtures relies on the element that possesses a large dielectric anisotropic. The mixing of the materials leads to a slight increase for splay elastic constants in an anti-parallel measurement cell.
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Manabe Osamu,Oyama-Manabe Noriko,Naya Masanao,Obara Masahiko,Kikuchi Yasuka,Aikawa Tadao,Tomiyama Yuuki,Sugimori Hiroyuki,Katoh Chietsugu,Tamaki Nagara,Anzai Toshihisa 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.1
Objective: Although the relationship between coronary stenosis and myocardial perfusion is well established, little is known regarding the contribution of subendocardial infarction to this relationship. The purpose of this study was to evaluate the effects of obstructive coronary stenosis and subendocardial infarction on myocardial flow reserve (MFR). Materials and Methods: Fifty-four patients with suspected and known coronary artery disease (CAD) who underwent perfusion 3T-MRI and invasive angiography were studied. The time-intensity curves of the left ventricle tissue and cavity were fitted by a single-compartment model to compute myocardial blood flow (MBF). Global MFR and regional MFR were calculated by dividing stress MBF by rest MBF. Myocardial infarction lesions were assessed by late gadolinium enhancement. The effects of obstructive coronary stenosis and subendocardial infarction on the regional MFR were evaluated. Results: Obstructed vessels (≥70% diameter stenosis for main vessels or ≥50% for left main) were observed in 65 out of 162 vessels. Further analysis demonstrated that MFR in obstructed vessels was significantly lower than that in non-obstructed vessels {1.48 [the interquartile range (IQR) : 1.31–2.03] vs. 1.84 (IQR: 1.44–2.46), p=0.01}. After excluding vessels with transmural infarction (n=19), the MFR for vessels with subendocardial infarction (n=20) was significantly lower than the MFR for non-infarction vessels (n=123) [1.48 (IQR: 1.40–1.79) vs. 1.88 (IQR: 1.41–2.48), p=0.02]. Conclusion: Subendocardial infarction in addition to obstructive coronary atherosclerosis might be associated with an impairment of regional MFR in patients with CAD.
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