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Analysis of Diesel Combustion Flames with Highly Oxygenated Fuels
Hideyuki Ogawa,Noboru Miyamoto,Noritaka Kimura,Yasunobu Hamada,Kim Bong-Seock 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
With highly oxygenated fuels the smoke emissions decreased sharply and linearly with increases in the fuel oxygen content and entirely disappeared at an oxygen content of 38 wt-% even at stoichiometric mixture conditions. The NOx also decreased monotonically with increases in oxygen content, and thermal efficiency slightly improved because of a reduction in cooling loss and improvement in the degree of constant volume combustion. The mechanisms of the significant reductions in emissions and improvement in engine performance were analyzed with a bottom view type DI diesel engine. Together with direct flame images. flame images were taken through an optical filter passing only two wavelengths for use in 2-D two-color analysis. The results showed that luminous flame decreased significantly with increases in oxygen content and was not detected for neat dimethoxy methane (DMM). The decrease in flame luminosity with highly oxygenated fuels corresponds with decreases in soot and cooling losses, including those due to heat radiation. The 2-D two-color flame analysis indicated that the high temperature flame and high KL factor areas apparently decreased with increasing fuel oxygen content. These results correspond strongly with decreases in NOx, smoke, and cooling loss with increases in oxygen content.<br/> <br/>
Alkoxysilane Compound Coating on Mortar Surfaces and Evaluation of Its Anti-biofilm Properties
Hideyuki Kanematsu,Dana M. Barry,Akiko Ogawa,Takeshi Kogo,Risa Kawai,Hidekazu Miura,Nobumitsu Hirai,Akihiro Maegawa,Yuki Murakami,Kaori Omata,Katsuhiko Tsunasima,Katsuhiko Sano,Akira Suzuki,Yoshiaki S 한국표면공학회 2023 한국표면공학회 학술발표회 초록집 Vol.2023 No.11-1
Biofilms formation of polymeric materials and its new quantitative evaluation
Hideyuki Kanematsu,Dana M. Barry,Akiko Ogawa,Takeshi Kogo,Risa Kawai,Hidekazu Miura,Nobumitsu Hirai,Takehito Kato,Toshio Kamijo,Michiko Yoshitake,Takeshi Hagio,Ryoichi Ichino 한국표면공학회 2023 한국표면공학회 학술발표회 초록집 Vol.2023 No.11-1
Transaplantation of neural stem cells into the spinal cord after injury
Okano, Hideyuki,Ogawa, Yuto,Nakamura, Masaya,Kaneko, Shinjiro,Iwanami, Akio,Toyama, Yoshiaki 한림대학교 환경·생명과학연구소 2003 [일송 국제심포지엄] 노화와 만성퇴행성 신경질환 Vol.- No.5
Thanks to advances in the stem cell biology of the central nervous system (CNS), the previously inconceivable regeneration of the damaged CNS is approaching reality. The availability of signals to induce the appropriate differentiation of the transplanted and/or endogenous neural stem cells(NSCs) as well as the timing of the transplantation are important for successful functional recovery of the damaged CNS. Because the immediately post-traumatic microenvironment of the spinal cord is in an acute inflammatory stage, it is not favorable for the survival and differentiation of NSC transplants. On the other hand, in the chronic stage after injury, glial scars form in the injured site that inhibit the regeneration of neuronal axons. Thus, we believe that the optimal timing of transplantation is 1-2 weeks after injury.
Analysis of Diesel Combustion Flames with Highly Oxygenated Fuels
Kim Bong-Seock,Ogawa Hideyuki The Korean Society of Marine Engineering 2005 한국마린엔지니어링학회지 Vol.29 No.6
With highly oxygenated fuels the smoke emissions decreased sharply and linearly with increases in the fuel oxygen content and entirely disappeared at an oxygen content of $38wt-\%$ even at stoichiometric mixture conditions The NOx also decreased monotonically with increases in oxygen content. and thermal efficiency slightly improved because of a reduction in cooling loss and improvement in the degree of constant volume combustion. The mechanisms of the significant reductions in emissions and improvement in engine performance were analyzed with a bottom view type DI diesel engine. Together with direct flame images, flame images were taken through an optical fetter passing only two wavelengths for use in 2-D two-color analysis. The results showed that luminous flame decreased significantly with increases in oxygen content and was not detected for neat dimethoxy methane(DMM). The decrease in flame luminosity with highly oxygenated fuels corresponds with decreases in soot and cooling losses, including those due to heat radiation. The 2-D two-color flame analysis indicated that the high temperature flame and high KL factor areas apparently decreased with increasing fuel oxygen content. These results correspond strongly with decreases in NOx. smoke. and cooling loss with increases in oxygen content.
Keisuke Yonamine,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Hiroaki Kusunose,Toshitaka Sakai,Kazuaki Miyamoto,Fumisato Kozakai,Hideyuki Anan,Haruka Okano,Masaya Oikawa,Takashi Tsuchiya,Takashi Sa 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.4
Background/Aims: We aimed to investigate (1) promising clinical findings for the recognition of focal type autoimmune pancreatitis (FAIP) and (2) the impact of endoscopic ultrasound (EUS)-guided tissue acquisition (EUS-TA) on the diagnosis of FAIP. Methods: Twenty-three patients with FAIP were involved in this study, and 44 patients with resected pancreatic ductal adenocarcinoma (PDAC) were included in the control group. Results: (1) Multivariate analysis revealed that homogeneous delayed enhancement on contrast-enhanced computed tomography was a significant factor indicative of FAIP compared to PDAC (90% vs. 7%, p=0.015). (2) For 13 of 17 FAIP patients (76.5%) who underwent EUS-TA, EUS-TA aided the diagnostic confirmation of AIPs, and only one patient (5.9%) was found to have AIP after surgery. On the other hand, of the six patients who did not undergo EUS-TA, three (50.0%) underwent surgery for pancreatic lesions. Conclusions: Homogeneous delayed enhancement on contrast-enhanced computed tomography was the most useful clinical factor for discriminating FAIPs from PDACs. EUS-TA is mandatory for diagnostic confirmation of FAIP lesions and can contribute to a reduction in the rate of unnecessary surgery for patients with FAIP.
함산소계 및 파라핀계 혼합 경유 및 저질유 액적의 연소특성에 관한 연구
김봉석,소천영지,Kim Bong-Seock,Ogawa Hideyuki 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.5
The single droplet combustion characteristics of diesel fuel and low quality oil with additive oxygenate and paraffin under high ambient temperature and atmospheric pressure were investigated in the study. The results of the study may are concluded as follows: In the combustion of diesel fuel and low quality oil droplet with additive of oxygenate and paraffin. the dimensionless droplet size of $(D/Do)^2$ was linearly decreased with time. A fuel droplet with low boiling temperature additives and in high boiling temperature base fuel evaporates and burns faster than usual base fuel. Especially. these trends were remarkably obtained by decreasing boiling point and increasing blending contents of additives in case of oxygenated agents rather than n-paraffin agents. This rapid burning may result from so-called 'micro-explosion' and its burning intensity varies with the types of additives. The results above may suggest that rapid evaporation of oxygenate additive in the middle stage of combustion can contribute much to combustion improvement of blended fuels.
Hiroaki Kusunose,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Toshitaka Sakai,Keisuke Yonamine,Kazuaki Miyamoto,Fumisato Kozakai,Hideyuki Anan,Kazuki Endo,Haruka Okano,Masaya Oikawa,Takashi Tsuchiy 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.3
Background/Aims: This study aimed to clarify the efficacy and safety of pancreatic duct lavage cytology combined with a cell-block method (PLC-CB) for possible pancreatic ductal adenocarcinomas (PDACs). Methods: This study included 41 patients with suspected PDACs who underwent PLC-CB mainly because they were unfit for undergoing endoscopic ultrasonography-guided fine needle aspiration. A 6-Fr double lumen catheter was mainly used to perform PLC-CB. Final diagnoses were obtained from the findings of resected specimens or clinical outcomes during surveillance after PLC-CB. Results: Histocytological evaluations using PLC-CB were performed in 87.8% (36/41) of the patients. For 31 of the 36 patients, final diagnoses (invasive PDAC, 12; pancreatic carcinoma in situ, 5; benignancy, 14) were made, and the remaining five patients were excluded due to lack of surveillance periods after PLC-CB. For 31 patients, the sensitivity, specificity, and accuracy of PLC-CB for detecting malignancy were 94.1%, 100%, and 96.8%, respectively. In addition, they were 87.5%, 100%, and 94.1%, respectively, in 17 patients without pancreatic masses detectable using endoscopic ultrasonography. Four patients developed postprocedural pancreatitis, which improved with conservative therapy. Conclusions: PLC-CB has an excellent ability to detect malignancies in patients with possible PDACs, including pancreatic carcinoma in situ.