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在地震射线层析成象中减少假象出现的一种尝试

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国外油气勘探 1987年第2期 22-26页

作者： hideki saito 张淑敏 OYO Corporation Japan

本文叙述一项关于干扰重建图象的假象的出现和减少的数值试验。假象出现的原因之一是炮一检观测系统的局限性。数值试验表明,这些假像是由炮一检观测系统的几何局限性所引起的。此外,数值试验还表明,假象的出现与所使的重建算法有关。因... 详细信息

本文叙述一项关于干扰重建图象的假象的出现和减少的数值试验。假象出现的原因之一是炮一检观测系统的局限性。数值试验表明,这些假像是由炮一检观测系统的几何局限性所引起的。此外,数值试验还表明,假象的出现与所使的重建算法有关。因此,我们试图用迭代重建法减少这种假象,这种方法包括ILST 和 SIRT 两种不同的算法。一般,这些算法可带来稳定的和微弱的畸变图形,对这些算法都施以某些合理的限制。但在此进行的数值试验的结果表明,联合两种不同的无限制算法的方法(作者称其为"交替法"),在某种程度上可以减少这些假象。进一步研究是必要的,但我们期望对算法施加限制条件的交替法,后来证明是有效的。

关键词：旅行时初至波层析成象基准点交替法限制射线路径纵波射线轨迹射线理论地震射线震源点观测系统

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层析成像技术在工程场地勘察中的应用

勘察科学技术 1991年第1期 61-62,58页

作者： hideki saito Hiromasa Shima 韦宝珠

引言地质层析成像是一种由地球物理技术测得的数据来重构地下介质物性剖面的方法。对不同物理现象和重构物性剖面有不同的层析图像。本文作者发展了下列三种层析成像技术,并将其应用于工程中大坝等场地地基的勘察。地震层析成像地震波... 详细信息

引言地质层析成像是一种由地球物理技术测得的数据来重构地下介质物性剖面的方法。对不同物理现象和重构物性剖面有不同的层析图像。本文作者发展了下列三种层析成像技术,并将其应用于工程中大坝等场地地基的勘察。地震层析成像地震波速度分布的重构雷达层析成像电磁波速度分布的重构电阻率层析成像电阻率分布的重构使用这三种层析成像技术。

关键词：层析成象工程场地勘察

Natural Convection Melting in a Rectangular Heat Storage Tank of Carbon Nanotube Dispersed Latent Heat Storage Material

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA Tomoya saito Kazunori TAKAI Yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

DiffMat:Latent diffusion models for image-guided material generation

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Visual Informatics 2024年第1期8卷 6-14页

作者： Liang Yuan Dingkun Yan Suguru saito Issei Fujishiro Graduate School of Science and Technology Keio UniversityKanagawaJapan School of Computing Tokyo Institute of TechnologyTokyoJapan Department of Information and Computer Science Keio UniversityKanagawaJapan

Creating realistic materials is essential in the construction of immersive virtual *** existing techniques for material capture and conditional generation rely on flash-lit photos,they often produce artifacts when the illumination mismatches the training *** this study,we introduce DiffMat,a novel diffusion model that integrates the CLIP image encoder and a multi-layer,crossattention denoising backbone to generate latent materials from images under various *** a pre-trained StyleGAN-based material generator,our method converts these latent materials into high-resolution SVBRDF textures,a process that enables a seamless fit into the standard physically based rendering pipeline,reducing the requirements for vast computational resources and expansive *** surpasses existing generative methods in terms of material quality and variety,and shows adaptability to a broader spectrum of lighting conditions in reference images.

关键词： SVBRDF Diffusion model Generative model Appearance modeling

Assessment of corrected time-step method for nominal ionospheric gradient calculation: A comparative analysis with spatial approaches

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Earth and Planetary Physics 2024年第4期8卷 641-649页

作者： Slamet Supriadi Prayitno Abadi Susumu saito Harry Bangkit Dwiko Unggul Prabowo Adi Purwono Ginaldi Ari Nugroho Research Center for Smart Mechatronics National Research and Innovation Agency(BRIN)BandungIndonesia Research Center for Climate and Atmosphere BRINBandungIndonesia School of Electrical Engineering Telkom UniversityKab.BandungIndonesia Electronic Navigation Research Institute National Institute of MaritimePort and Aviation TechnologyTokyoJapan Research Center for Space BRINBandungIndonesia

The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is generally obtained from Continuously Operating Reference Stations data by using the spatial single-difference method(mixed-pair,station-pair,or satellite-pair)or the temporal single-difference method(time-step).The time-step method uses only a single receiver,but it still contains ionospheric temporal *** introduce a corrected time-step method using a fixed-ionospheric pierce point from the geostationary equatorial orbit satellite and test it through simulations based on the global ionospheric *** also investigate the effect of satellite paths on the corrected time-step method in the region of the equator,which tends to be in a more north–south direction and to have less coverage for the east–west ionospheric *** study also addresses the limitations of temporal variation correction coverage and recommends using only the correction from *** processes are developed under simulations because observational data are still difficult to *** findings demonstrate that the corrected time-step method yieldsσvig values consistent with other approaches.

关键词： ground-based augmentation system nominal ionospheric gradient time-step correction global ionospheric model

Hyperacute experimental model of rat lung transplantation using a coronary shunt cannula

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World Journal of Transplantation 2024年第2期14卷 155-161页

作者： Munehisa Takata Yusuke Tanaka Daisuke saito Shuhei Yoshida Isao Matsumoto Department of Thoracic Surgery Kanazawa UniversityKanazawa 920-8641IshikawaJapan

BACKGROUND Lung transplantation is a well-established treatment of end-stage lung disease.A rodent model is an inexpensive way to collect biological data from a living model after lung ***,mastering the surgical technique takes time owing to the small organ *** To conduct rat lung transplantation using a shunt cannula(SC)or modified cannula(MC)and assess their *** Rat lung transplantation was performed in 11 animals in the SC group and 12 in the MC *** devised a method of rat lung transplantation using a coronary SC for coronary artery bypass surgery as an anastomosis of pulmonary arteri-ovenous vessels and *** same surgeon performed all surgical proce-dures in the donor and recipient rats without using a magnifying *** success rate of lung transplantation,operating time,and PaO2 values were com-pared after 2-h reperfusion after *** Ten and 12 lungs were successfully transplanted in the SC and MC groups,*** the SC group,one animal had cardiac arrest within 1 h after reperfusion owing to bleeding during pulmonary vein *** opera-ting time for the removal of the heart-lung block from the donor and preparation of the left lung graft was 26.8±2.3 and 25.7±1.3 min in the SC and MC groups,respectively(P=0.21).The time required for left lung transplantation in the recipients was 37.5±2.8 min and 35.9±1.4 min in the SC and MC groups,respectively(P=0.12).PaO2 values at 2 h after reperfusion were 456.2±25.5 and INTRODUCTION Lung transplantation is a well-established treatment of end-stage lung *** immune and non-immune mech-anisms in lung transplantation are highly complex,and post-transplant complications such as infections and primary and chronic lung allograft dysfunction must be reduced to improve ***,there is a need for immunological and pathophysiological analyses using animal lung transplantation *** rat lung transplantation model was f

关键词： Lung transplantation Rat Shunt cannula Modified cannula Reperfusion

Evaluating mechanism of banana pseudo-stem retting using seawater:A cost-effective surface pre-treatment approach

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Journal of Bioresources and Bioproducts 2024年第3期9卷 322-335页

作者： Prince Hotor Ahmed H.Hassanin Osbert Akatwijuka Mohamed A.H.Gepreel Mitsuo Yamamoto Yukie saito Ahmed Abdel-Mawgood Egypt-Japan University of Science and Technology Biotechnology ProgramAlexandria GovernorateNew Borg Al Arab 21934Egypt Alexandria University Department of Textile EngineeringAlexandria GovernorateBab Sharqi 5424041Egypt Egypt-Japan University of Science and Technology Material Science and EngineeringAlexandria GovernorateNew Borg Al Arab 21934Egypt Graduate School of Agricultural and Life Sciences The University of TokyoBunkyo-KuTokyo 113-8657Japan

Retting has been employed to extract natural fibers from agricultural wastes as a biological and cost-effective approach for *** its global abundance,banana pseudo-stem is a promising agro-waste for lignocellulosic fiber *** this study,fibers were extracted from the pseudo-stems after being pre-treated under four conditions using seawater at room temperature for up to 35 d Bacterial isolation from the fresh seawater sample and screening for ligninolytic ability were *** load as well as laccase and manganese peroxidase enzyme activity profile assay during the retting duration were *** transform infrared(FT-IR)and X-day diffraction(XRD)analyses were also examined for both pre-treated and untreated extracted *** results shows that six out of the eight bacterial isolates had the ability to degrade *** treatments(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)recorded the highest viable bacterial load of 9.24×102 and 4.46×102 CFU,respectively,on the 14th day of the retting ***,the highest laccase and manganese peroxidase enzymes activity was recorded for(Raw stem+Raw seawater)and(Autoclaved stem+Raw seawater)treatments in the second to the third *** FT-IR spectra of the pre-treated fibers revealed relative reductions in peaks attributed to polysaccharides and other amorphous substances for all retting *** XRD diffractogram revealed that the crystallinity index(CI)of pre-treated fibers increased in all seawater retting treatment ***,the CI for fibers pre-treated under enzymatic conditions were enhanced even after five *** analysis for selected bacterial isolates showed homology to sequences of Bacillus velezensis,Shewanella sp.L8–5,and Citrobacter amalonaticus and Bacillus subtilis j8 *** these findings,it was suggested that physical,biological,and chemical actions were collectively involved in the seawater retting process of banana ps

关键词： Seawater retting Banana pseudo-stem Natural fiber Enzyme activity Colony forming unit

Ultrasound-guided peripheral nerve blocks for anterior cutaneous nerve entrapment syndrome after robot-assisted gastrectomy: A case report

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World Journal of Gastrointestinal Surgery 2024年第8期16卷 2719-2723页

作者： Yukiko saito Hirohisa Takeuchi Joho Tokumine Ryuji Sawada Kunitaro Watanabe Tomoko Yorozu Department of Anesthesiology Kyorin University School of MedicineTokyo 181-8611Japan Department of Surgery Kyorin University School of MedicineTokyo 181-8611Japan

BACKGROUND Anterior cutaneous nerve entrapment syndrome(ACNES)is a condition mani-festing with pain caused by strangulation of the anterior cutaneous branch of the lower intercostal *** case report aims to provide new insight into the selection of peripheral nerve blocks for the ACNES *** SUMMARY A 66-year-old woman manifested ACNES after a robot-assisted distal *** ultrasound-guided rectal sheath block was effective for pain triggered by the port ***,the sudden severe pain,which radiated laterally from the previous site,remained.A transversus abdominis plane block was performed for the remaining pain and effectively relieved *** In this case,the trocar port was inserted between the rectus and transverse abdominis *** intercostal nerves might have been entrapped on both sides of the rectus and transversus abdominis ***,rectus sheath and transverse abdominis plane blocks were required to achieve complete pain *** the best of our knowledge,this is the first report on use of a combination of rectus sheath and transverse abdominis plane blocks for pain relief in ACNES.

关键词： Anterior cutaneous nerve entrapment syndrome Rectus sheath block Trans-verse abdominal plane block Hydrodissection Robot-assisted gastrectomy Case report

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基于离子液体的深度除湿技术及应用探索

工程热物理学报 2024年第10期45卷 2958-2964页

作者：曹博文殷勇高 Giannetti Niccolo saito Kiyoshi 东南大学能源与环境学院南京210096 低碳型建筑环境设备与系统节能教育部工程研究中心南京210096 早稻田大学基础科学与工程研究生院东京169-0072 早稻田大学早稻田高等研究所东京169-8050 早稻田大学应用力学和航空航天工程系东京169-8555

液体深度除湿是实现低湿度行业低碳转型的一种有效途径。目前,具有深度除湿潜力(极低蒸气压、非结晶和无腐蚀)的离子液体是传统盐溶液的理想替代。本研究搭建了离子液体深度除湿实验平台,并分析了不同运行工况下的除湿性能。结果表明:降... 详细信息

液体深度除湿是实现低湿度行业低碳转型的一种有效途径。目前,具有深度除湿潜力(极低蒸气压、非结晶和无腐蚀)的离子液体是传统盐溶液的理想替代。本研究搭建了离子液体深度除湿实验平台,并分析了不同运行工况下的除湿性能。结果表明:降膜/鼓泡吸收方式均能实现较高的深度除湿效果,最低出风含湿量可降至2.0 g/kg(da)以下。同时,对于进口含湿量为3.3 g/kg(da)的低湿工况,降膜装置的除湿效率仅为40%左右。然而,鼓泡装置的除湿效率可达到81%,有效开发了离子液体的深度除湿潜力。此外,总结了两种吸收方式的先进性与适用性,为离子液体深度除湿技术的应用提供指导。

关键词：深度除湿离子液体除湿性能实验研究