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Recent progress in upgrading metallurgical-grade silicon to solar-grade silicon via pyrometallurgical routes

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 767-782页

作者： Yun Lei Xiaodong Ma Ye Wang Zhiyuan Chen Yongsheng Ren Wenhui Ma kazuki morita Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Sustainable Minerals Institute The University of QueenslandSt Lucia 4072QLDAustralia School of Chemical Engineering Sichuan UniversityChengdu 610065China Separation and Conversion Technology Flemish Institute for Technological ResearchMol 2400Belgium Department of Materials Engineering Graduate School of EngineeringThe University of TokyoTokyo 113-8656Japan

Si-based photovoltaic solar power has been rapidly developed as a renewable and green energy *** widespread use of Sibased solar cells requires large amounts of solar-grade Si(SoG-Si)to manufacture Si *** routes,mainly the modified Siemens process,have dominated the preparation of polycrystalline SoG-Si;however,traditional chemical techniques employ a series of complex chemical reactions involving various corrosive and hazardous *** addition,large amounts of complex waste solar cells and Si kerf slurry waste gradually accumulate and are difficult to recycle using these *** methods are required to meet the demand for SoGSi preparation and Si waste *** metallurgical route shows promise but is hindered by the problem of eliminating B and P from metallurgical-grade Si(MG-Si).Various pyrometallurgical treatments have been proposed to enhance the removal of B and P from *** article reviews Si refining with slag treatment,chlorination,vacuum evaporation,and solvent refining,and summarizes and discusses the basic principles and recent representative studies of the four *** these,solvent refining is the most promising and environmentally friendly approach for obtaining low-cost SoG-Si and is a popular research ***,a simple and green approach,i.e.,a combination of solvent refining,slag treatment,or vacuum directional solidification,is proposed for low-cost SoG-Si preparation using MG-Si or Si wastes as raw materials.

关键词： silicon refining solar-grade silicon solvent refining vacuum evaporation slag treatment Si kerf slurry waste

An Experimental Study on Response and Control of a Flapping-Wing Aerial Robot Under Wind Gusts

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Journal of Bionic Engineering 2024年第1期21卷 209-223页

作者： kazuki Shimura Hikaru Aono Chang-kwon Kang Graduate School of Science and Technology Shinshu University3-15-1 TokidaUedaNagano 3868567Japan Department of Mechanical Engineering and Robotics 3-15-1 TokidaUedaNagano 3868567Japan Department of Mechanical and Aerospace Engineering University of Alabama in HuntsvilleTechnology Hall N266HuntsvilleAL35899USA

Bioinspired flapping-wing micro-air-vehicles(FWMAVs)have the potential to be useful aerial tools for gathering information in various *** recent advancements in manufacturing technologies and better understanding of aerodynamic mechanisms behind of the flapping flight,outdoor flights have become a ***,to fully realize the potential of FWMAVs,further improvements are necessary,particularly in terms of stability and robustness under gusty *** this study,the response and control of a tailless two-winged FWMAV under the wind gusts are *** experiments are conducted with a one-degree-of-freedom gimbal to focus on effects of wind gusts on the rotational motion of the ***-derivative and sliding-mode controls are adopted for the attitude *** present that the body angles changed in time and reached approximately 50°at the maximum due to the wing *** sliding-mode controller can more effectively control the rotational angle in the presence of disturbances and both the wing speed and changes in wind speed have an impact on the effectiveness of attitude *** results contribute to the development of of tailless two-winged,single-motor driven FWMAVs in terms of the design of attitude controller and testing apparatus.

关键词： Flapping-wing micro-air vehicles Sliding-mode control Pitch and roll angle-Wind gus

Aging-induced memory loss due to decreased N1-acetyl-5-methoxykynuramine,a melatonin metabolite,in the hippocampus:a potential prophylactic agent for dementia

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Neural Regeneration Research 2025年第6期20卷 1705-1706页

作者： kazuki Watanabe Atsuhiko Hattori Department of Immunobiology Institute of Development Aging and CancerTohoku UniversitySendaiMiyagiJapan Department of Sport and Wellness College of Sport and WellnessRikkyo UniversityNiizaSaitamaJapan

Melatonin(N-acetyl-5-methoxytryptamine)is known as the hormone of darkness because it is synthesized at night and involved in regulating the circadian *** hormone is primarily synthesized by the vertebrate pineal gland,but is ubiquitous among invertebrates,unicellular organisms,plants,and even cyanobacteria(Hattori and Suzuki,2024).Melatonin is well-conserved evolutionarily and possesses several physiological functions,such as immune response,bone and glucose metabolism,and memory formation besides regulating the circadian rhythm.

关键词： metabolism primarily agent

Si-Al-Sn合金熔体中块体硅定向生长行为研究

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无机材料学报 2016年第8期31卷 791-796页

作者：李亚琼李佳艳谭毅张立峰森田一樹北京科技大学冶金与生态工程学院北京100083 大连理工大学材料科学与工程学院大连116024 东京大学工学院材料工程学院日本东京1538505

为从Si-Al-Sn合金中有效分离初晶硅,本研究提出并实现了三元合金定向生长块体硅的技术。通过考察冷却速度、合金成分、温度梯度与晶体生长速度比值(G/R)等参数及其影响机制,确定促进块体硅稳定生长的有利条件;对比Si-Al、Si-Sn二元合金... 详细信息

为从Si-Al-Sn合金中有效分离初晶硅,本研究提出并实现了三元合金定向生长块体硅的技术。通过考察冷却速度、合金成分、温度梯度与晶体生长速度比值(G/R)等参数及其影响机制,确定促进块体硅稳定生长的有利条件;对比Si-Al、Si-Sn二元合金体系,采用成分过冷理论分析金属Sn对三元合金中块体硅生长行为的影响;采用电子探针显微分析仪考察块体硅微观组织形貌与杂质分布。研究结果表明:定向凝固方法能有效分离块体硅,同时抑制块体硅内金属夹杂物生成,并将杂质含量控制在其固溶度范围内,成为一种有效分离、回收高纯初晶硅的新途径。

关键词： Si-Al-Sn合金定向凝固块体硅

Myocardial metastasis from ZEB1-and TWIST-positive spindle cell carcinoma of the esophagus:A case report

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World Journal of Gastroenterology 2024年第11期30卷 1636-1643页

作者： Yoshihiro Shibata Hirofumi Ohmura kazuki Komatsu Kosuke Sagara Atsuji Matsuyama Ryuji Nakano Eishi Baba Department of Medical Oncology Fukuoka Wajiro HospitalFukuoka 811-0213Japan Department of Oncology and Social Medicine Kyushu University Graduate School of Medical SciencesFukuoka 812-8582Japan Department of Pathology and Oncology University of Occupational and Environmental HealthKitakyushu 807-8555Japan Department of Diagnostic Pathology Fukuoka Wajiro HospitalFukuoka 811-0213Japan

BACKGROUND Metastatic cardiac tumors are known to occur more frequently than primary cardiac tumors,however,they often remain asymptomatic and are commonly dis-covered on *** tumors with a relatively high frequency of cardiac metastasis include mesothelioma,melanoma,lung cancer,and breast cancer,whereas reports of esophageal cancer with cardiac metastasis are *** SUMMARY The case of a 60-year-old man who complained of dysphagia is *** gastrointestinal endoscopy showed a submucosal tumor-like elevated lesion in the esophagus causing ***-enhanced computed tomography showed left atrial compression due to the esophageal tumor,multiple liver and lung metastases,and a left pleural *** examination of a biopsy speci-men from the esophageal tumor showed spindle-shaped cells,raising suspicion of esophageal *** disease progressed rapidly,and systemic chemotherapy was deemed necessary,however,due to his poor general condition,adminis-tration of cytotoxic agents was considered *** his high Combined Positive Score,nivolumab was administered,however,the patient soon died from the *** autopsy confirmed spindle cell carcinoma(SCC)of the esophagus and cardiac metastasis with similar histological *** stem cell markers,ZEB1 and TWIST,were positive in both the primary tumor and the cardiac *** To the best of our knowledge,there have been no prior reports of cardiac metastasis of esophageal *** case highlights our experience with a patient with esophageal SCC who progressed rapidly and died from the disease,with the autopsy examination showing cardiac metastasis.

关键词： Spindle cell carcinoma Esophagus Myocardial metastasis Epithelial-mesenchymal transition Case report

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

日本旧石器晚期石器技术起源的新考古学与人类学证据（英文）

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人类学学报 2024年第3期43卷 470-487页

作者： Hiroyuki SATO kazuki MORISAKI The University of Tokyo

对日本旧石器时代晚期开端的探讨主要通过两种模式展开，即列岛内旧石器时代中期演化模式和大陆旧石器时代晚期扩散或迁徙模式，然而，最近来自日本和周边国家的考古学证据正对这种简单的模式提出挑战。本文批判性地回顾了包括可能存在... 详细信息

对日本旧石器时代晚期开端的探讨主要通过两种模式展开，即列岛内旧石器时代中期演化模式和大陆旧石器时代晚期扩散或迁徙模式，然而，最近来自日本和周边国家的考古学证据正对这种简单的模式提出挑战。本文批判性地回顾了包括可能存在的早中期在内的日本旧石器时代已有年代序列，并尝试展示有关日本旧石器时代晚期开端的另一种模式。本文列举了一些可能属于旧石器时代早中期的发现，并建议进一步开展地质考古研究，以了解其可信度以及与旧石器时代晚期早段(EUP)之间的文化关系。目前，日本EUP的开端以距今约3.9-3.7万年前古本州岛具有台形石器和锯齿刃器的石片工业为特征。尽管台形石器仅流行于日本EUP阶段，并且可能源自岛内更早的石器传统，但这一石器工业也在一定程度上显示出与同时期中国和朝鲜半岛石器组合的相似之处。石叶技术最早出现于古本州岛中部，比最早的石片技术晚了约1000年。虽然石叶技术可能起源于前一时期的长石片技术，但突然性的同时出现也可能意味着这一技术由朝鲜半岛扩散而来。本文认为，由于区域适应策略的不同，源自朝鲜半岛的石叶技术进入到古本州岛东北部，包括本州西部的日本海沿岸地区，而不是石片技术长期盛行的西南地区。

关键词：日本列岛旧石器时代晚期早段迁徙路线台形石器锯齿刃器石叶技术

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金属硅中杂质元素的熔渣氧化研究

金属硅中杂质元素的熔渣氧化研究

Aszonapyrone A Isolated from Neosartorya spinosa IFM 47025 Inhibits the NF-κB Signaling Pathway Activated by Expression of the Ependymoma-Causing Fusion Protein ZFTA-RELA

2010年全国冶金物理化学学术会议

作者：伍继君马文会刘大春杨斌戴永年王烨 kazuki morita 昆明理工大学冶金与能源工程学院真空冶金国家工程实验室东京大学工业科学研究院

光电工业正面临多晶硅原料短缺的严峻考验,全球光伏产品以每年30%的速度持续增长。金属硅中主要含有Fe,Al,Ca,Ti,B,P,O等杂质,通过定向凝固可以去除硅中的大部分金属杂质,但对分凝系数较大的杂质元素不起作用。本文采用熔渣精炼的方法,... 详细信息

光电工业正面临多晶硅原料短缺的严峻考验,全球光伏产品以每年30%的速度持续增长。金属硅中主要含有Fe,Al,Ca,Ti,B,P,O等杂质,通过定向凝固可以去除硅中的大部分金属杂质,但对分凝系数较大的杂质元素不起作用。本文采用熔渣精炼的方法,探讨了金属硅中杂质元素的氧化作用,重点分析了硅中杂质元素硼的氧化去除过程。在感应炉中向金属硅粉中添加40%CaO-60%SiO的渣进行熔渣精炼实验,通过SEM,EDS分析手段研究并讨论了硅中硼等杂质元素的氧化去除,结果表明:经熔渣精炼,金属硅中分布在晶界处的杂质得到明显去除,但铁的杂相不能被氧化,钙的杂相与CaO-SiO渣的反应性较差,凝固过程熔渣容易附着在硅与坩埚之间的内壁上,渣与硅液能得到很好的分离。

关键词：金属硅熔渣氧化精炼硼

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Advances in Microbiology 2024年第9期14卷 448-467页

作者： kazuki Ishikawa Nao Kamiya Masaki Ishii Takashi Yaguchi Koji Ichinose Shinya Ohata Faculty of Pharmaceutical Sciences Teikyo Heisei University Nakano Tokyo Japan Research Institute of Pharmaceutical Sciences Faculty of Pharmacy Musashino University Nishitokyo-Shi Tokyo Japan Medical Mycology Research Center Chiba University Inohana Chiba Japan

Ependymoma is a rare and chemotherapy-resistant brain tumor, which has resulted in a delay in the development of drugs to treat it. A subclass of supratentorial ependymomas (ST-EPN), designated ST-EPN-zinc finger-translocation-associated (ZFTA, ST-EPN-ZFTA), exhibits the expression of a fusion protein comprising ZFTA and v-rel reticuloendotheliosis viral oncogene homolog A (RELA), an effector transcription factor of the nuclear factor-kappa B (NF-κB) pathway (ZFTA-RELA). The expression of ZFTA-RELA results in the hyperactivation of the oncogenic NF-κB signaling pathway, which ultimately leads to the development of ST-EPN-ZFTA. To identify inhibitors of the NF-κB signaling pathway activated by the expression of ZFTA-RELA, we used a doxycycline-inducible ZFTA-RELA-expressing NF-κB reporter cell line and found that extracts of the fungus Neosartorya spinosa IFM 47025 exhibited NF-κB inhibitory activity. We identified eight compounds [aszonapyrone A (2), sartorypyrone A (3), epiheveadride (4), acetylaszonalenin (5), (R)-benzodiazepinedione (6), aszonalenin (7), sartorypyrone E (8) and (Z, Z)-N,N’-(1,2-bis[(4-methoxyphenyl)methylene]-1,2-ethanediyl)bis-formamide (9)] from N. spinosa IFM 47025 culture extract using a variety of chromatographic techniques. The structures of these compounds were identified through the analysis of various instrumental data (1D, 2D-NMR, MS, and optical rotation). The NF-κB responsive reporter assay indicated that compounds 2, 3, 5, 7, and 9 exhibited inhibitory activity. We further evaluated the inhibitory activity of these compounds against the expression of endogenous NF-κB responsive genes (CCND1, L1CAM, ICAM1, and TNF) and found that compound 2 showed significant inhibitory activity. Further studies are required to elucidate the mechanism of action of compound 2, which may serve as a lead compound for the development of a novel therapy for ST-EPN-ZFTA.

关键词： Aszonapyrone A Neosartorya spinosa NF-κB Signaling Pathway Ependymoma ZFTA-RELA