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Selective removal of Cr(Ⅵ)using polyvinylpyrrolidone and polyacrylamide co-modified MoS_(2) ccomposites by adsorption combined with reduction

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Chinese Chemical Letters 2024年第6期35卷 524-530页

作者： Shuqi Yu Yu Yang Keisuke kuroda Jian Pu Rui Guo Li-An Hou State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Department of Environmental and Civil Engineering Toyama Prefectural UniversityImizuToyama 939-0398Japan Institute for the Advanced Study of Sustainability United Nations UniversityJingumae 5-53-70Shibuya-kuTokyo 150-8925Japan Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China

Cr(Ⅵ),one of the most hazardous metal pollutants,poses significant threats to the environment and human ***,a novel MoS_(2) composite(MoS_(2)/PVP/PAM)modified by polyvinylpyrrolidone(PVP)and polyacrylamide(PAM)was synthesized to enhance the removal of Cr(Ⅵ).Characterization analysis including SEM,XRD,FTIR,and XPS indicated that PVP and PAM could increase the interlayer spacing and the dispersibility of MoS_(2),and introduce pyrrolic N and amino functional *** batch experiments showed that MoS_(2)/PVP/PAM represented excellent Cr(Ⅵ)removal performance over a wide p H range,and exhibited a significantly higher maximum Cr(Ⅵ)adsorption capacity(274.73 mg/g,at p H 3.0,and 298 K)than pure MoS_(2).The adsorption of Cr(Ⅵ)followed Langmuir and pseudo-second-order kinetic model,which was a homogeneous monolayer chemisorption ***_(2)/PVP/PAM showed stable removal of Cr(Ⅵ)in the presence of humic acid(HA),interfering cations and anions at different ***,it had excellent selectivity for Cr(Ⅵ)(K_(d) value of 1.69×10^(7)m L/g)when coexisting with a variety of competing *** characterization revealed that Cr(Ⅵ)was reduced to low toxicity Cr(Ⅲ)by Mo^(4+)and S^(2-),and then chelated on the surface of the adsorbent by pyrrolic *** research expanded the design concept for MoS_(2) composites by demonstrating the potential of MoS_(2)/PVP/PAM as a promising material for selective elimination of Cr(Ⅵ)in water.

关键词： Polyvinylpyrrolidone Polyacrylamide MoS_(2) Cr(Ⅵ)removal Adsorbent Reduction

亚洲高等教育区域化的特征、原则与模式——对话日本早稻田大学黑田一雄教授

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世界教育信息 2024年第5期37卷 3-9页

作者：黑田一雄赵湘钟周早稻田大学研究生院东京169-0051 清华大学教育研究院北京100084

在亚洲高等教育区域化的趋势下,教育合作和学术交流日益密切。当前西方发达国家仍然是国际学生主要留学目的地,而亚洲国家作为留学目的国的影响力也越来越大。在区域教育治理方面,亚洲高等教育具有多样性,不能简单采用像欧洲那样的统一... 详细信息

在亚洲高等教育区域化的趋势下,教育合作和学术交流日益密切。当前西方发达国家仍然是国际学生主要留学目的地,而亚洲国家作为留学目的国的影响力也越来越大。在区域教育治理方面,亚洲高等教育具有多样性,不能简单采用像欧洲那样的统一区域化结构。文章对亚洲高等教育区域化的历史与现状进行剖析,提出有别于欧洲高等教育的区域治理多层次结构,采用“和平”与“发展”作为亚洲高等教育区域化的指导原则,倡导用雁行模式理解亚洲高等教育合作。在当前高等教育区域化形势中,需继续采用和促进亚洲高等教育的区域和机构伙伴关系的多层次结构,以促进亚洲高等教育区域化的多样性和活力,同时需重申全球高等教育的历史使命及其对区域和世界和平与社会经济发展的重要性和意义。

关键词：亚洲高等教育区域化雁行模式多层次结构区域多样性高等教育合作

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Chemically oligomerizable TDP-43:a novel chemogenetic tool for studying the pathophysiology of amyotrophic lateral sclerosis

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Neural Regeneration Research 2022年第11期17卷 2434-2436页

作者： Kohsuke Kanekura Yoshiaki Yamanaka Tamami Miyagi Masahiko kuroda Department of Molecular Pathology Tokyo Medical University

Amyotrophic lateral sclerosis (ALS) is a devastating neurodegenerative disease characterized by the progressive loss of both upper and lower motor *** ALS cases are sporadic,but approximately 5-10%of patients have a f... 详细信息

关键词： sclerosis familial

Effect of mechanical ball milling on the electrical and powder bed properties of gas-atomized Ti-48Al-2Cr-2Nb and elucidation of the smoke mechanism in the powder bed fusion electron b eam melting process

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Journal of Materials Science & Technology 2023年第6期137卷 36-55页

作者： Seungkyun Yim Kenta Aoyagi keiji Yanagihara Huakang Bian Akihiko Chiba Institute for Materials Research Tohoku University2-1-1 KatahiraSendaiMiyagi 980-8577Japan

Smoke is unexpected powder-splashing caused by electrostatic force and is one of the main problems hindering the process stability and applicability of the powder bed fusion electron beam(PBF-EB)*** this study,mechanical stimulation was suggested to suppress smoke of gas-atomized(GA)Ti-48Al-2Cr-2Nb powder using Al_(2)O_(3) and WC ball *** deformation mechanism of the GA powder depending on the ball milling media was discussed based on the developed particle morphology distribu-tion map and contact mechanics *** was revealed that the rapid decrement of flowability and packing density after WC ball milling owing to the formation of angular fragments by the brittle *** variation of surface and electrical properties by mechanical stimulation was investigated via XPS,TEM,and Impedance *** electrical resistivity of the ball-milled powders gradually decreased with increasing milling duration,despite the increased oxide film thickness,and the capacitive response disappeared in Al-60 and WC-30 via metal-insulator *** could be due to the accumulation of strain and defects on the oxide film via mechanical *** smoke mechanism of ball-milled powders was discussed based on the percolation *** the smoke experiment,smoke was more suppressed for WC-10 and WC-20 than that for Al-40 and Al-50,respectively,despite the longer charge dissipation *** could be due to the high probability of contact with conductive *** the Al-60 and WC-30 powders,smoke was further restricted by the formation of a percolation cluster with metal-like electrical *** believe that this study will contribute to a better understanding of the smoke mechanism and process optimization of the PBF-EB.

关键词： Metal-insulator transition Electron beam melting additive manufacturing Packing density Flowability Smoke mechanism Percolation theory

Natural hybridization and introgression in sympatric Ligularia species(Asteraceae,Senecioneae)

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Journal of Systematics and Evolution 2011年第5期49卷 438-448页

作者： Chiaki kuroda Department of Chemistry Rikkyo University

The difficulty in clarifying species of genus Ligularia *** been attributed to rapid and continuous allopatric speciation in small and isolated populations,combined with interspecific diploid hybridization in the Qinghai-Tibetan Plateau and adjacent ***,no concrete example has been reported to prove this *** studied a natural mixed population of six species of Ligularia in which some individuals were morphologically intermediate between *** and *** on DNA sequences(trnC-F,trnL-rpL32,trnQ5 rps16,trnK-rps16,and internal transcribed spacer) and inter-simple sequence repeat data,we concluded that putative hybrids are primarily products of hybridization between *** and *** other four species or additional,unknown species may also be involved in *** hybridization is bidirectional but *** individuals were mostly the first generation,but F2 and later-generation hybrids were also ***,the backcrossed individuals detected indicate that natural gene flow occurs among at least three Ligularia *** may become stabilized to form new species or may function as intermediates in evolutionary diversification.

关键词： chloroplast fragments ISSR markers Ligularia natural hybridization nuclear ribosomal ITS.

Chloroplast DNA variation and phylogeography of Ligularia tongolensis (Asteraceae), a species endemic to the Hengduan Mountains region of China

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Journal of Systematics and Evolution 2011年第2期49卷 108-119页

作者： Chiaki kuroda Department of Chemistry Rikkyo University

In this research, we aimed to study the genetic variation and phylogeographic pattern of Ligularia tongolensis, a perennial herb endemic to the Hengduan Mountains region of China. We sequenced two chloroplast DNA (cpDNA) intergenic spacers (trnQ-5 rps16, trnL-rpl32) in 140 individuals from 14 populations of three groups (Jinshajiang vs. Yalongjiang vs. Wumeng) within this species range. High levels of haplotype diversity (Hd = 0.814) and total genetic diversity (Ht = 0.862) were detected at the species level, based on a total of 12 haplotypes identified. Low levels of intrapopulation diversity (Hs = 0.349), high levels of genetic divergence (Gst = 0.595, Nst = 0.614, Fst = 0.597), and the absence of isolation by distance tests were also found in L. tongolensis. Furthermore, H2 and H5, the dominant haplotypes that located at internal nodes and deviated from extinct ancestral haplotype in the network, were found to be shared between Jinshajiang and Yalongjiang groups. These results indicate that past fragmentation may be the important factor responsible for the present phylogeographical pattern of L. tongolensis. Meanwhile, the locations occupied by each group might have served as independent refugia for L. tongolensis during the Quaternary glaciation. Unimodal mismatch distribution and star-like genealogies indicated this species underwent past demographic expansion events, with expansion ages of 274 ka BP.

关键词： genetic variation Ligularia tongolensis phylogeography Quaternary glaciation.

Non-prosthetic treatment using segmental osteotomy and bone grafting in a patient with cleft lip and palate

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Plastic and Aesthetic Research 2022年第1期9卷 654-660页

作者： Atsuhiro Inoue Michiko Tsuji Yoshiyuki Baba keiji Moriyama Department of Maxillofacial Orthognathics Graduate School of Medical and Dental SciencesTokyo Medical and Dental University1-5-45 YushimaBunkyo-kuTokyo 113-8549Japan Division of Pedodontics and Orthodontics Department of Surgical SpecialtiesNational Center for Child Health and Development2-10-1 OkuraSetagaya-kuTokyo 157-8535Japan

This case report aimed to present the course of surgically combined comprehensive orthodontic treatment of a male adult with cleft lip and palate,showing a left alveolar cleft,lateral deviation of the major segment of the maxilla,and palatal transposition of the lateral ***,the midline of the upper central incisors was shifted by 7.0 mm to the right,the right lateral incisor showed palatal transposition,and the residual alveolar cleft was 6.5 *** Le Fort I osteotomy of the major segment,and simultaneous bone grafting into the extended alveolar bone and former cleft region were performed at 18 years and 4 months of ***,midline correction,alignment of the right lateral incisor,and cleft closure were achieved;no further prosthetic treatment was required.

关键词： Cleft lip and palate palatal transposition segmental Le Fort I osteotomy bone grafting

Indian monsoon variability in the Mahanadi Basin over the last two glacial cycles and its implications on the Indonesian throughflow

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Geoscience Frontiers 2023年第1期14卷 215-229页

作者： Jongmin Lee Sunghan Kim Minoru Ikehara keiji Horikawa Yoshihiro Asahara Chan Min Yoo Boo-Keun Khim Department of Oceanography Pusan National UniversityBusan 46241South Korea Deep-sea Mineral Resources Research Center Korea Institute of Ocean Science&TechnologyBusan 49111South Korea Division of Glacial Environment Research Korea Polar Research InstituteIncheon 21990South Korea Center for Advanced Marine Research Kochi UniversityKochi 783-8502Japan Graduate School of Science and Engineering for Research University of ToyamaToyama 930-8555Japan Department of Earth and Planetary Sciences Nagoya UniversityNagoya 464-8601Japan

The orbital-scale variability of the Indian summer monsoon(ISM)has been influenced by multiple factors,such as atmospheric CO_(2)concentration,global ice volume,and *** for weathering activity and paleo-productivity provide potential insights into the driving forces of its *** documented multi-proxy data at IODP Site U1445,located in the Mahanadi Basin of the northwestern Bay of Bengal,to find out ISM variability over the last 200 *** proxy records,such as Nd/Sr isotopes of detrital particles,clay mineral compositions of the fine-grained sediments,biogenic opal and CaCO_(3),organic carbon contents,and carbon isotopes of organic matter,represent sediment sources,weathering patterns,and paleo-productivity related to the ISM *** Nd/Sr isotope data and clay mineral compositions suggest that the sediments at Site U1445 originated mainly from the Ganges,Brahmaputra,and Meghna rivers without dramatic provenance change between the glacial and interglacial *** weathering activity inferred from clay mineral compositions and the paleo-productivity shift reconstructed by biogenic opal and CaCO_(3)contents suggest that the land-sea interactions were closely linked to the ISM precipitation between the glacial and interglacial *** precipitation by the strong ISM resulted in intense chemical weathering and dominant biogenic opal deposition during the interglacial *** contrast,low precipitation by the weak ISM led to reduced chemical weathering and predominant CaCO_(3)deposition during the glacial ***,the ISM variability driving the land-sea interactions in the Mahanadi Basin was modulated by the Indonesian throughflow(ITF).Our study emphasizes the role of low-latitude forcing of climatic changes in the strong relationship between the ISM and ITF over orbital periods,providing a base for future investigations.

关键词： Provenance Weathering activity Paleo-productivity Indian summer monsoon Bay of Bengal Indonesian throughflow

PREPARATION OF MICRON-SIZED NONSPHERICAL POLYSTYRENE/POLY(STYRENE-co-ETHYLENEGLYCOL DIMETHACRYLATE) PARTICLES BY SEEDED SOAP-FREE EMULSION POLYMERIZATION

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Chinese Journal of Polymer Science 2011年第5期29卷 634-638页

作者：石山 Shin-ichi kuroda Key Laboratory of Applied Technology of Polymer Materials College of Materials Science and EngineeringShenyang University of Chemical Technology Department of Production Science and Technology Faculty of EngineeringGunma UniversityOta 373-0057Japan

Micron-sized nonspherical polymer particles having different morphologies were synthesized by seeded soap-free emulsion polymerization of styrene （St） and ethyleneglycol dimethacrylate （EGDMA, used as a crosslinker） on spherical, linear polystyrene （PS） seed particles. The morphology of the resulting PS/poly（St-co-EGDMA） particles was dependent on the crosslinker concentration and polymerization temperature.

关键词： Nonspherical Polymer particles Seeded soap-free emulsion polymerization Crosslinking.