Fully vertical AlN-on-SiC Schottky barrier diodes

We demonstrated fully vertical Schottky barrier diodes (SBDs) that have a Si-doped AlN drift layer directly grown on n-type 4H-SiC substrate by metal-organic chemical-vapor deposition. The AlN SBD with a Ni anode showed a clear rectifying characteristic at 300-500 K and rectification ratio of about 102. We found that the leakage current of the vertical AlN-on-SiC devices is affected by defects in the AlN drift layer and Schottky interface.This work was financially supported by JSPS KAKENHI Grants No. 23K26556 and 23K21082, the TRiSTAR program under the Strategic Professional Development Program for Young Researchers by MEXT, and the “Advanced Research Infrastructure for Materials and Nanotechnology in Japan (ARIM)” project of MEXT (No. JPMXP1223BA0011). This work was carried out at the Nano-Processing Facility at AIST and at the open facility at the University of Tsukuba.journal articl

A preliminary test for nitrogen recovery potential of nitrogen fixing cyanobacteria and its granules treating wastewater containing different nitrogen species

Nitrogen compounds in wastewater can be regarded as both troublesome pollutants and nutrients/resources that may be reused and recycled. Currently, nitrogen (N) removal from wastewater in most wastewater treatment plants (WWTPs) is implemented by the destructive methods like nitrification/denitrification processes, and little attention has been paid to recovery and recycle of N resource in WWTPs. In this preliminary study, the granulation of cyanobacteria (i.e., Aphanizomenon flos-aquae Ralfs ex Bornet & Flahault) was achieved, and comparison was made in terms of N recovery/fixation potential when treating wastewater containing different N species. During the granulation process, the settleability indicated by sludge volume index at 5 min (SVI5) and biomass concentration varied from initially > 3000 mL/g and 0.2 g/L to 59 mL/g and 1.2 g/L, respectively. This observation suggests biogranulation may be utilized to effectively and simultaneously cultivate and harvest cyanobacteria, greatly reducing energy consumption and operation costs. Both cyanobacteria and its granules were found to remove 57–100 % of NO3–-N in 5 days under N2 recirculation at an initial NO3–-N of 15.0 mg/L. Compared to the seed cyanobacterial cells, after 3-day batch test the granular biomass contained 83 % higher total N content, about 73.3 mg N in comparison to 40.0 mg N for per gram of biomass under the same N2 recirculation condition, 236 % more proteins, and 115 % times higher N fixation capability. Results from this work can provide a promising solution for N recovery/fixation with reduced N loss/emission from WWTPs and then create nitrogen bioeconomy in wastewater industry.journal articl

a review of Existence of groupoid models for diagrams of groupoid correspondences by Ko Joanna; Meyer Ralf

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SCCmec transformation requires living donor cells in mixed biofilms

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Recent Status of Phase I Clinical Trials for Brain Tumors: A Regulatory Science Study of Exploratory Efficacy Endpoints

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障害科学研究 48巻 : 表紙, 目次, 奥付, 他

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Molecular Design of Naphthalene‐ and Carbazole‐Based Monomers for Regiospecific Synthesis of Poly(arylenevinylene)s via Co‐Catalyzed Hydroarylation Polyaddition

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a review of Duality for positive opetopes and positive zoom complexes by Zawadowski Marek

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<書評>苫野一徳監修、古田雄一・認定 NPO法人カタリバ編著『校則が変わる、生徒が変わる、学校が変わる―みんなのルールメイキングプロジェクト―』学事出版、2022年

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茨城県笠間における稲田石産業の変遷と生産流通構造に関する研究

departmental bulletin pape