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Experimental investigation on effective aerosol scavenging using different spray configurations with pre-injection of water mist for Fukushima Daiichi decommissioning

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Nuclear Science and Techniques 2024年第5期35卷 154-172页

作者： Rui-Cong Xu Avadhesh Kumar Sharma Erdal Ozdemir Shuichiro Miwa Shunichi suzuki Department of Nuclear Engineering and Management The University of Tokyo7‑3‑1 HongoBunkyo‑KuTokyo 113‑8656Japan Nuclear Professional School The University of Tokyo2‑2

During the decommissioning of the Fukushima Daiichi nuclear power plant,it is important to consider the retrieval of resolidified debris both in air and underwater *** the subsequent retrieval of debris from the reactor building,the resolidified debris must be cut into smaller pieces using various cutting *** the cutting process,aerosol particles are expected to be generated at the submicron *** has been noted that such aerosols sizing within the Greenfield gap(0.1-1μm)are difficult to remove effectively using traditional spraying ***,to improve the aerosol removal efficiency of the spray system,a new aerosol agglomeration method was recently proposed,which involves injecting water mist to enlarge the sizes of the aerosol particles before removing them using water *** this study,a series of experiments were performed to clarify the proper spray configurations for effective aerosol scavenging and to improve the performance of the water *** experimental results showed that the spray flow rate and droplet characteristics are important factors for the aerosol-scavenging efficiency and performance of the water *** results obtained from this study will be helpful for the optimization of the spray system design for effective aerosol scavenging during the decommissioning of the Fukushima Daiichi plant.

关键词： Fukushima Daiichi decommissioning Aerosol scavenging Multiphase flow Spray system Aerosol-mist agglomeration

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Experimental investigation of Thermal Performance of Novel Finned Radiators for Automotive Cooling System

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Journal of Thermal Science 2024年第5期33卷 1726-1743页

作者： SiNGH Hardeep TiNG David S-K READER Graham ESHTiAGHi Nicky iCHiYANAGi Mitsuhisa suzuki Takashi Turbulence&Energy Laboratory University of WindsorWindsor N9B 3P4Canada Chemical and Environmental Engineering School of EngineeringRMIT UniversityMelbourneVictoria 3001Australia Department of Engineering and Applied Sciences Sophia UniversityTokyo 102-8554Japan

This research investigates innovative fin-type radiators for automobile engine cooling ***-channel and helical radiators,along with straight type,were analyzed for heat transfer characteristics under various *** uniqueness of this study is evident in the design of microchannel and helical *** helical radiators,the inner rod features 4/8 helical-shaped water galleries,while the outer tube frame with embedded fins remains *** contrast,the microchannel radiators have compact trapezoidal-shaped water galleries with separate fin ***,the novelty of the research is enhanced by the utilization of 3D printing technology in the manufacturing *** constant fin height analysis at varied water and air flow rate,Microchannel Water Air Radiator with fin height 10.5 mm(MCWAR10.5)depicted a higher heat transfer rate amongst the *** comparison to Straight Water Air Radiator with fin height 9.5 mm(SWAR9.5),the heat transfer rate is 30.3%and 1.3 times ***,in constant fin surface area analysis,microchannel radiator(MCWAR3.2)illustrates lower heat dissipation than Helical radiator(HWAR138)but higher than HWAR134 and Straight radiator(SWAR6).The examination of pumping loss indicated that the Micro-channel radiator outperformed helical radiators due to its lower pressure *** average pressure loss for Micro-channel radiators was 0.74 kPa,making it 1.2 times higher than that of a straight radiator(0.62 kPa),indicating a better trade-off.

关键词： heat exchangers multi-channel helical heat exchanger heat transfer 3D printing

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Therapeutic potential of stem cells in subarachnoid hemorrhage

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Neural Regeneration Research 2025年第4期20卷 936-945页

作者： Hideki Kanamaru Hidenori suzuki Department of Neurosurgery Mie University Graduate School of MedicineTsuJapan

Aneurysm rupture can result in subarachnoid hemorrhage,a condition with potentially severe consequences,such as disability and *** the acute stage,early brain injury manifests as intracranial pressure elevation,global cerebral ischemia,acute hydrocephalus,and direct blood–brain contact due to aneurysm *** may subsequently cause delayed cerebral infarction,often with cerebral vasospasm,significantly affecting patient *** complications such as brain volume loss and chronic hydrocephalus can further impact *** the mechanisms of subarachnoid hemorrhage-induced brain injury is paramount for identifying effective *** cell therapy,with its multipotent differentiation capacity and anti-inflammatory effects,has emerged as a promising approach for treating previously deemed incurable *** review focuses on the potential application of stem cells in subarachnoid hemorrhage pathology and explores their role in neurogenesis and as a therapeutic intervention in preclinical and clinical subarachnoid hemorrhage studies.

关键词： delayed cerebral ischemia early brain injury matricellular protein neurogenesis stem cell therapy subarachnoid hemorrhage

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Non-improvement of atrophic gastritis in cases of gastric cancer after successful Helicobacter pylori eradication therapy

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World Journal of Clinical Cases 2024年第14期12卷 2342-2349页

作者： Yuto suzuki Yasumi Katayama Yo Fujimoto ikuhiro Kobori Masaya Tamano Department of Gastroenterology Dokkyo medical University Saitama Medical CenterKoshigayaSaitama 343-8555Japan Endoscopy Center Dokkyo Medical University Saitama Medical CenterKoshigayaSaitama 343-8555Japan

BACKGROUND Helicobacter pylori(***)infection is closely related to the development of gastric cancer(GC).However,GC can develop even after *** ***,it would be extremely useful if GC could be predicted after *** Kyoto classification score for gastritis(GA)is closely related to cancer ***,how the score for GC changes after eradication before onset is not well *** To investigate the characteristics of the progression of Kyoto classification scores for GC after *** *** Eradication of *** was confirmed in all patients using either the urea breath test or the stool antigen *** Kyoto classification score of GC patients was evaluated by endoscopy at the time of event onset and three years *** ad-dition,the modified atrophy score was evaluated and compared between the GC group and the control GA *** in total,30 cases of early GC and 30 cases of chronic GA were *** pathology of the cancer cases was differentiated adenocarcinoma,except for one case of undifferentiated *** total score of the Kyoto classifi-cation was significantly higher in the GC group both at the time of cancer onset and three years earlier(4.97 vs 3.73,P=0.0034;4.2 vs 3.1,P=0.0035,respectively).The modified atrophy score was significantly higher in the GC group both at the time of cancer onset and three years earlier and was significantly improved only in the GA group(5.3 vs 5.3,P=0.5;3.73 vs 3.1,P=0.0475,respectively).CONCLUSiON The course of the modified atrophy score is useful for predicting the onset of GC after *** with severe atrophy after *** eradication require careful monitoring.

关键词： Helicobacter pylori Kyoto classification Gastritis Eradication therapy Gastric cancer

Experimental study on the effect of micro-carbon additives in vegetable oils for aquifer thermal energy storage

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CLEAN ENERGY 2024年第2期8卷 48-59页

作者： suzuki, Takashi ichiyanagi, Mitsuhisa Yilmaz, Emir Maxwell, Archie G. K. Anggraini Handoyo, Ekadewi Sophia Univ Dept Engn & Appl Sci 7-1 Kioi ChoChiyoda Ku Tokyo 1028554 Japan Sophia Univ Grad Sch Sci & Technol 7-1 Kioi ChoChiyoda Ku Tokyo 1028554 Japan Petra Christian Univ Dept Mech Engn Siwalankerto 121-131 Surabaya 60291 Indonesia

Aquifer thermal energy storage is a versatile method for regulating building temperatures, utilizing groundwater as a medium for both summer cooling and winter heating. Water has high thermal conductivity and specific heat but is corrosive, creating a mineral build-up that causes scaling. Additionally, its high freezing point presents operational challenges. Vegetable oils emerge as a promising alternative, owing to their lower freezing points. in light of environmental concerns, researchers are exploring vegetable oils as substitutes for petroleum-derived mineral oils. This paper is intended as an initial study using vegetable oils, i.e. coconut and sunflower oil, as the heat-transfer medium in aquifer thermal energy storage. The experiments assess the heat-transfer coefficient of coconut, sunflower, mineral, and synthetic oils when exposed to the same heat source. The study also evaluates the impact of introducing micro-carbon (graphite and charcoal) to the oils. Results indicate that sunflower oil has the highest heat-transfer coefficient of 374.4 W/m2 K among the oils, making it suitable for aquifer thermal energy storage applications. Furthermore, augmenting sunflower oil with charcoal powder enhances its performance by increasing the heat-transfer coefficient to 474.9 W/m2 K, or a 27% increase. in contrast, coconut oil proves unsuitable for aquifer thermal energy storage deployment because of its low heat-transfer coefficient of 293.7 W/m2 K. The heat-transfer coefficient of synthetic oil increases with graphite powder but decreases with charcoal powder introduction. The use of vegetable oils as the heat-transfer medium in aquifer thermal energy storage is studied experimentally to assess the heat-transfer coefficients of coconut, sunflower, mineral and synthetic oils. The study also evaluates the impact of introducing micro-carbon (graphite and charcoal) to the oils. Graphical Abstract

关键词： sunflower oil aquifer thermal energy storage charcoal graphite vegetable oil COCONUT OiL PERFORMANCE

Japanese Sign Language Recognition by Combining Joint Skeleton-Based Handcrafted and Pixel-Based Deep Learning Features with Machine Learning Classification

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 2605-2625页

作者： Jungpil Shin Md.Al Mehedi Hasan Abu Saleh Musa Miah Kota suzuki Koki Hirooka School of Computer Science and Engineering The University of AizuAizuwakamatsu965-8580Japan Department of Computer Science&Engineering Rajshahi University of Engineering&TechnologyRajshahi6204Bangladesh

Sign language recognition is vital for enhancing communication accessibility among the Deaf and hard-of-hearing *** Japan,approximately 360,000 individualswith hearing and speech disabilities rely on Japanese Sign Language(JSL)for ***,existing JSL recognition systems have faced significant performance limitations due to inherent *** response to these challenges,we present a novel JSL recognition system that employs a strategic fusion approach,combining joint skeleton-based handcrafted features and pixel-based deep learning *** system incorporates two distinct streams:the first stream extracts crucial handcrafted features,emphasizing the capture of hand and body movements within JSL ***,a deep learning-based transfer learning stream captures hierarchical representations of JSL gestures in the second ***,we concatenated the critical information of the first stream and the hierarchy of the second stream features to produce the multiple levels of the fusion features,aiming to create a comprehensive representation of the JSL *** reducing the dimensionality of the feature,a feature selection approach and a kernel-based support vector machine(SVM)were used for the *** assess the effectiveness of our approach,we conducted extensive experiments on our Lab JSL dataset and a publicly available Arabic sign language(ArSL)*** results unequivocally demonstrate that our fusion approach significantly enhances JSL recognition accuracy and robustness compared to individual feature sets or traditional recognition methods.

关键词： Japanese Sign Language(JSL) hand gesture recognition geometric feature distance feature angle feature GoogleNet

External defects and severity level evaluation of potato using single and multispectral imaging in near infrared region Author links open overlay panel

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information Processing in Agriculture 2024年第1期11卷 80-90页

作者： Dimas Firmanda Al Riza Slamet Widodo Kazuya Yamamoto Kazunori Ninomiya Tetsuhito suzuki Yuichi Ogawa Naoshi Kondo Laboratory of Biosensing Engineering Graduate School of AgricultureKyoto UniversityKitashirakawaKyoto 6068267Japan Department of Biosystems Engineering Faculty of Agricultural TechnologyUniversitas BrawijayaJl.VeteranMalang 65145Indonesia Department of Mechanical and Biosystem Engineering Bogor Agricultural UniversityJl.Raya Darmaga Kampus IPB DarmagaBogor 16680Indonesia Technology Development Department Shibuya Seiki Co.Ltd.66Takaoka-choMatsuyamaEhime 7918036Japan

Non-invasive potato defects detection has been demanded for sorting and grading *** on the classification of the defects has been available,however,investigation on the severity level calculation is *** the detection of the common scab,it has been found that imaging in the infrared region provide an interesting characteristic that could distinguish defected area to normal ***,investigations on this wavelength range is interesting to add more knowledge and for *** this research,the multispectral image has been obtained and investigated especially at three wavelengths(950,1150,1600 nm).image pre-processing and pseudo-color conversion techniques were explored to enhance the contrast between defects,normal background skin area and soil *** show that external defects,such as common scab and some mechanical damage types,appear brighter in the near infrared region,especially at 1600 nm against the normal skin *** has been found that pseudo-color images conversion provides more information regarding type if surface characteristics compared to grayscale single *** segmentation using pseudo-color images after multiplication operation pre-processing could be used for common scab and mechanical damage detection excluding soil deposits with a Dice Sorensen coefficient of *** addition,image segmentation using single image at 1600 nm shown relatively better results with Dice Sorensen coefficient of 0.72 with note that thick soil deposits will also be *** severity level evaluation had an R2 correlation of 0.84 against standard measurements of severity.

关键词： Multispectral imaging Pseudo-color Common scab External defects Near infrared

Nitrogen-based fertilizers differentially affect protist community composition in paddy field soils

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Soil Ecology Letters 2024年第3期6卷 35-44页

作者： Seda Ozer Bodur Solomon Oloruntoba Samuel Kazuki suzuki Naoki Harada Rasit Asiloglu Graduate School of Science and Technology Niigata UniversityNiigataJapan Department of Plant and Microbial Biology North Carolina State UniversityRaleighNCUSA institute of Science and Technology Niigata UniversityNiigataJapan

Protists are one of the most diverse and dominant microbial groups and they play critical roles in the soil *** nitrogen fertilizers have a profound impact on protist communities,still less is known about how different nitrogen fertilizer types affect protist community composition in different soil *** we investigated the effects of six inorganic nitrogen fertilizers(urea,ammonium nitrate,ammonium sulfate,potassium nitrate,ammonium chloride,and diammonium hydrogen phosphate)and an organic fertilizer(a mixture of rice husk and cow manure)on protist community composition in three paddy field soils using a high-throughput sequencing *** effect of the fertilizers on the functional groups of protists,namely consumers(predators and decomposers),photoautotrophs,and parasites(plant pathogens and animal parasites)was also *** results showed that nitrogen fertilizers had distinctive effects on the beta diversity of the protists,while we also observed that the same fertilizer had slightly different effects depending on the soil *** and Rhizaria were the most affected protist taxonomical groups,while predatory protists were the main functional groups that were affected by nitrogen *** forest analysis showed that most of the fertilizer-affected protists were predators,among which Cercozoa was the most affected *** conclusion,our results provide important insights into the impact of nitrogen fertilizers on soil protist communities.

关键词： nitrogen fertilizer bottom-up paddy field predatory protist soil protist community

JR East aims for driverless Shinkansen operation

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High-speed Railway 2024年第03期 197-201页

作者： Yasuaki suzuki Mobility Service Department Railway Business Headquarters East Japan Railway Company

East Japan Railway Company(JR East) is aiming to “realize driverless train operation” as one of the key measures to respond to rapid changes in the business environment. Currently, Automatic Train Operation(ATO)equipment is not installed on the Shinkansen, but there are plans to introduce ATO or driverless operation in the near future. From 2018–2021, the Ministry of Land, infrastructure, Transport and Tourism(MLiT) held the “ATO Technology Study Group for Railways” in which the concept of technical requirements necessary for driverless operation was discussed. in 2021, JR East conducted the GOA4 demonstration test on the Joetsu Shinkansen. in this test, we were able to confirm the basic functions of Shinkansen vehicles such as automatic departure control,speed control, fixed position stop control, and remote stop control using ATO. We aim to realize unattended operation(GOA4) for deadhead trains between Niigata Station and the Niigata Shinkansen Rolling Stock Center by the end of the 2020 s, and driverless operation(GOA3) for passenger trains of the Joetsu Shinkansen by the mid-2030s and continue to develop the necessary technologies and build systems.

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