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灌区多孔质生态河床的改良及净污效果试验研究

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三峡大学学报（自然科学版） 2008年第1期30卷 44-48页

作者：罗朝晖王超平山公明陈丹山梨大学大学院医学工学综合教育部环境社会创生工程系日本山梨县甲府市河海大学环境科学与工程学院南京210098 河海大学农业工程学院南京210098

将多孔质生态河床技术引入生态型灌区受损水体修复中.在冬季低温条件下,通过室内试验,延续了前期研究,采用仿生植物填料丝改良了块石多孔质生态河床,并与碎石多孔质生态河床对比,分析了两种河床模型对污染水体的净化效果.结果表明:采用... 详细信息

将多孔质生态河床技术引入生态型灌区受损水体修复中.在冬季低温条件下,通过室内试验,延续了前期研究,采用仿生植物填料丝改良了块石多孔质生态河床,并与碎石多孔质生态河床对比,分析了两种河床模型对污染水体的净化效果.结果表明:采用仿生植物填料丝改良的块石多孔质生态河床是修复受损水体较理想的方法,它可以有效地降低由于水力条件的改变对河床的扰动,减轻由于底质污染物向上覆水体的再释放而导致的二次污染程度,还有利于增加河床的比表面积,增加微生物的数量和种类,提高河流的自净能力.此外,对比分析了两种河床模型对TP,TN、NH4+-N和CODMn去除机制.

关键词：生态型灌区多孔质河床仿生植物填料丝块石碎石净化

Nanotwin-assisted nitridation of quenched FeNi alloy nanopowders for rare-earth-free magnets

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Journal of Materials Science & Technology 2023年第34期165卷 244-252页

作者： Jian Wang Yusuke hirayama Kazuyuki Suzuki Kwangjae Park Zheng Liu Kenta Takagi Kimihiro Ozaki Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology4-205SakurazakaMoriyamaNagoya463-8560Japan

L1_(0)-ordered FeNi alloy with a high uniaxial magnetic anisotropy and large magnetic moment is a promising candidate for rare-earth-free permanent magnets ***,the synthesis of this chemically ordered phase remains a longstanding challenge because of its low chemical order-disorder transition temperature(200-320℃).Although a non-equilibrium synthetic route based on a nitrogen topotactic reaction has been proposed as a valid approach,the volume fraction and degree of chemical ordering of the product phase are ***,we propose a promising approach that promotes the efficient formation of L1_(0)-ordered nitride phase in FeNi nanopowders by introducing a quenching treatment during a low-oxygen induction thermal plasma *** quenched FeNi nanopowders possessed much smaller powder sizes(40.4 vs 74.0 nm),exhibited higher number densities of nanotwins(39.8%vs 24.1%)and formed much larger volume fraction(33.6 wt.%vs 0.6 wt.%)of ordered phase than the unquenched ***,quenching-induced high-density nanotwins led to the dominant coverage of serrated{001}crystal facets over the surfaces of the FeNi *** unique features substantially accelerated the formation of the L1_(0)-ordered nitride phase in the FeNi nanopowders because the{001}crystallographic orientation had the highest nitrogen *** work provides not only a valid synthetic approach for mass production of the L10-ordered nitride phase in FeNi nanopowders but also novel insights into the crystal-defect-assisted nitridation of nanomaterials.

关键词： Rare-earth-free Permanent magnet FeNi Nitridation Nanotwin

A 2-D mesoscopic model for the evaluation of creep damage induced by void growth in polycrystalline metals

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Acta Metallurgica Sinica(English Letters) 2011年第3期24卷 213-219页

作者： Tao YU kimiaki YOSHIDA Huiji SHI Key Laboratory of Applied Mechanics Department of Engineering Mechanics Tsinghua University Beijing 100084 China v Research Laboratory Ishikawajima-Harima Heary Industries Co. Ltd. Tokyo Japan

At elevated temperature, creep failures of polycrystalline metals after long-term constant loading are often caused by the nucleation, growth and coalescence of creep voids on the grain boundaries. Void h＇action is an important parameter for the evaluation of creep damage level of structural materials operating at high temperature. In this paper, a 2-D numerical simulation method was developed for analyzing the void fraction evolution during the process of creep, based on some hypothesis from experiments. The model was implemented and then was used to predict the evolution of void fraction in the 2.25Cr-1Mo steel of uniaxial creep experiment at 570 ℃, in which the simulation results showed good agreement with the experimental results.

关键词： Creep damage Grain boundary Void fraction Voronoi tessellation

Molecular evidence for biochemical diversification of phenolamide biosynthesis in rice plants

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Journal of Integrative Plant Biology 2016年第11期58卷 903-913页

作者： kimiaki Tanabe Yuko Hojo Tomonori Shinya Ivan galis Institute of Plant Science and Resources Okayama University Kurashiki 710-0046 Japan

Two phenolamides （PAs）, p-coumaroylputrescine and feruloylputrescine strongly accumulate in rice （Oryza sativa cv. Nipponbare） leaves subjected to attack of chewing and sucking herbivores. Here we identified and characterized in vitro three novel rice genes that mediated coumaroyI-CoA/ feruloyI-CoA conjugation to polyamines, putrescine and agmatine. Interestingly, two genes were highly specific for their polyamine substrates, encoding putresdne N-hydrox- ycinnamoyltransferase and agmatine N-hydroxycinnamoyl- transferase, while the third enzyme could use both polyamines and it was therefore annotated as putrescine/ agmatine N-hydroxycinnamoyltransferase. All genes were preferentially expressed in rice roots and developing flowers, and in addition, the putrescine/agmatine N-hydroxycinnamoyl- transferase transcripts were strongly induced by wounding in the young rice leaves. Because the wound response of this gene was only partially suppressed in the jasmonoyI-L-isoleucine deficient plants （Osjarl）, it suggests that its upregulation （as well as inducible PAs in rice） may be largely independent of jasmonoyI-L-isoleucine signaling pathway. The finding of three closely related genes with a similar and/or overlapping activity in PA biosynthesis provides another striking example of rapid diversification of plant metabolism in response to environmental stresses in nature.

关键词： Acyltransferase p-coumaroylputrescine defense feruloylputrescine phenolamides rice (Oryza sativa)

Atomically precise thiolate-protected gold nanoclusters:Current status of designability of the structure and physicochemical properties

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聚集体(英文)

聚集体(英文) 2023年第2期4卷 1-41页

作者： Sakiat Hossain Daisuke hirayama Ayaka Ikeda Mai Ishimi Sota Funaki Arpan Samanta Tokuhisa Kawawaki Yuichi Negishi Research Institute for Science and Technology Tokyo University of ScienceShinjuku-kuJapan Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceShinjuku-kuJapan

Thiolate(SR)-protected gold nanoclusters(Aun(SR)m NCs)are a rare type of material capable of simultaneously exhibiting multiple physicochemical properties well-suited to specific applications,including photoluminescence,thermocatalysis,electrocatalysis,photocatalysis,magnetism,and optical *** the past several decades,there has been tremendous progress in our understanding of the structure and physicochemical properties of Aun(SR)m NCs,resulting in the ability to fine-tune the characteristics of these *** is therefore helpful to examine the extent to which the properties of Aun(SR)m and related metal NCs can now be adjusted based on *** review presents representative examples of previous studies concerning the geometry,electronic structure,luminescence properties,catalysis,magnetism and optical activity of Aun(SR)m and related metal NCs and discusses the current status of the designability of these NCs to impart specific structural and physicochemical *** information is expected to accelerate the fabrication of highly functional materials based on Aun(SR)m and related metal NCs.

关键词： atomically precise metal nanoclusters gold nanoclusters physicochemical properties structures thiolate

On large scale CFD-DEM simulation for gas-liquid-solid,three-phase flows

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Particuology 2021年第6期19卷 2-15页

作者： kimiaki Washino Ei L.Chan Tetsushi Kaji Yoshiaki Matsuno Toshitsugu Tanaka Department of Mechanical Engineering Osaka UniversitySuitaOsaka 565-0871Japan

Particulate flows in a mixture of gas and liquid,***-liquid-solid three-phase flows,are frequently encountered both in nature and *** such flows,complex interactions between multiple phases,***-particle interactions,fluid-particle interactions and interfacial interactions(such as surface tension and particle wetting),play a crucial *** literature,simulations of three-phase flows are sometimes performed by incorporating interface capturing methods(*** method)into the CFD-DEM coupling ***,it is practically impossible to perform large(industrial)scale simulation because of the high computational *** of the strategies often employed to reduce the computational cost in CFD-DEM is to upscale particle size,which is applied mainly to particle single-phase and fluid-solid two-phase *** present work is focused on the scaled-up particle model for gas-liquid-solid three-phase *** interaction forces between multiple phases are scaled using the general criteria derived from the continuum assumption of particulate flow.A colour function based interface-capturing method with improved interface smoothness is developed,and the diffusion based coarse graining is employed to ensure sufficient space resolution in CFD even when particle size is *** is shown that the model developed is capable of predicting the both particles and fluid behaviour in the original system.

关键词： CFD-DEM Three-phase flow Scaled-up particle Surface tension and wetting

Exact Bosonic Solutions of the Truncated Skyrme Model

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Chinese Physics Letters 2010年第6期27卷 35-36页

作者： SHI Chang-Guang hirayama Minoru Department of Mathematics and Physics Shanghai University of Electric Power Shanghai 200090 Department of Physics University of Toyama Gofuku 3190 Toyama Japan

A model defined by half the Lagrangian （the highly nonlinear part） of the Skyrme model is investigated. Two classes of bosonic solutions are obtained. It is shown that, although the field configurations of these two... 详细信息

关键词： Models Solutions Model

Machine Learning in Predicting Printable Biomaterial Formulations for Direct Ink Writing

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Research 2023年第4期2023卷 105-115页

作者： Hongyi Chen Yuanchang Liu Stavroula Balabani Ryuji hirayama Jie Huang Department of Mechanical Engineering University College LondonLondonUK Department of Computer Science University College LondonLondonUK Wellcome-EPSRC Centre for Interventional Surgical Sciences(WEISS) University College LondonLondonUK.

Three-dimensional(3D)printing is emerging as a transformative technology for biomedical *** 3D printed product can be patient-specific by allowing customizability and direct control of the *** trial-and-error approach currently used for developing the composition of printable inks is time-and resource-consuming due to the increasing number of variables requiring expert *** intelligence has the potential to reshape the ink development process by forming a predictive model for printability from experimental *** this paper,we constructed machine learning(ML)algorithms including decision tree,random forest(RF),and deep learning(DL)to predict the printability of biomaterials.A total of 210 formulations including 16 different bioactive and smart materials and 4 solvents were 3D printed,and their printability was *** ML methods were able to learn and predict the printability of a variety of inks based on their biomaterial *** particular,the RF algorithm has achieved the highest accuracy(88.1%),precision(90.6%),and F1 score(87.0%),indicating the best overall performance out of the 3 algorithms,while DL has the highest recall(87.3%).Furthermore,the ML algorithms have predicted the printability window of biomaterials to guide the ink *** printability map generated with DL has finer granularity than other *** has proven to be an effective and novel strategy for developing biomaterial formulations with desired 3D printability for biomedical engineering applications.

关键词： printing formulation biomaterials

Evaluation of gut dysbiosis using serum and fecal bile acid profiles

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World Journal of Clinical Cases 2022年第34期10卷 12484-12493页

作者： Tadakuni Monma Junichi Iwamoto Hajime Ueda Makoto Tamamushi Fumio Kakizaki Naoki Konishi Shoichiro Yara Teruo Miyazaki Takeshi hirayama Tadashi Ikegami Akira Honda Department of Gastroenterology and Hepatology Tokyo Medical University Ibaraki Medical CenterInashiki-Gun 300-0395Japan Joint Research Center Tokyo Medical University Ibaraki Medical CenterInashiki-Gun 300-0395Japan

Dysbiosis in the intestinal microflora can affect the gut production of microbial metabolites,and toxic substances can disrupt the barrier function of the intestinal wall,leading to the development of various *** levels of Clostridium subcluster XIVa(XIVa)are associated with the intestinal dysbiosis found in inflammatory bowel disease(IBD)and Clostridium difficile infection(CDI).Since XIVa is a bacterial group responsible for the conversion of primary bile acids(BAs)to secondary BAs,the proportion of intestinal XIVa can be predicted by determining the ratio of deoxycholic acid(DCA)/[DCA+cholic acid(CA)]in feces *** example,serum DCA/(DCA+CA)was significantly lower in IBD patients than in healthy controls,even in the remission *** results suggest that a low proportion of intestinal XIVa in IBD patients might be a precondition for IBD onset but not a consequence of intestinal *** report showed that a reduced serum DCA/(DCA+CA)ratio could predict susceptibility to ***,the BA profile,particularly the ratio of secondary to primary BAs,can serve as a surrogate marker of the intestinal dysbiosis caused by decreased XIVa.

关键词： Gut dysbiosis Clostridium subcluster XIVa Bile acids HPLC-MS/MS Inflammatory bowel diseases Clostridium difficile infection