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低压氩气氛火花放电等离子体中铜的时间分辨发射光谱及其激发机理(英文)

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冶金分析 2007年第1期27卷 24-28页

作者： NAKAMURA Syuya wagatsuma kazuaki Institute for Materials Research Tohoku University

抽真空充氩激发条件下,测定了Cu元素的单次火花脉冲放电时的几种原子线和离子线的放电强度随着氩气气氛压力变化的情况。它的原子谱线和离子谱线的放电信号随时间变化的峰形有很大差异。原子共振线CuⅠ324.75 nm的峰宽要大于离子线CuⅡ2... 详细信息

抽真空充氩激发条件下,测定了Cu元素的单次火花脉冲放电时的几种原子线和离子线的放电强度随着氩气气氛压力变化的情况。它的原子谱线和离子谱线的放电信号随时间变化的峰形有很大差异。原子共振线CuⅠ324.75 nm的峰宽要大于离子线CuⅡ213.60 nm的峰宽。对于CuⅠ324.75 nm谱线,其单次放电寿命几乎与氩气压力无关,在随时间变化的峰形中包含一个初始峰和一个较大的后端拖尾峰,在氩气压力增大时拖尾峰更加明显。对于CuⅡ213.60 nm谱线,其单次放电寿命在不同氩气压力条件下有一定变化,在随时间变化的峰形中包含一个初始峰和一个小的后端拖尾峰。在每一次火花脉冲放电中,激发机理是随时间变化而变化的,因此上述现象就可以从它们的激发机理的不同得以解释。

关键词：减压氩气气氛火花放电等离子体原子发射光谱时间分辨铜激发机理

玻尔兹曼分布研究辉光放电等离子体中铁原子谱线的激发机制

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冶金分析 2015年第1期35卷 13-18页

作者：张蕾 wagatsuma kazuaki 刘鑫日本东北大学未来科学技术共同研究中心日本东北大学金属材料研究所首钢股份公司迁安钢铁公司河北唐山064400

采用玻尔兹曼分布法，通过不同的放电参数，例如外加电压、电流和气压等，研究了辉光放电等离子体中激发能量为4．1-7．0eV的铁原子谱线激发机制。低激发能量曲线很好地拟合了正玻尔兹曼分布，然而较高激发能量的原子谱线与线性玻尔兹... 详细信息

采用玻尔兹曼分布法，通过不同的放电参数，例如外加电压、电流和气压等，研究了辉光放电等离子体中激发能量为4．1-7．0eV的铁原子谱线激发机制。低激发能量曲线很好地拟合了正玻尔兹曼分布，然而较高激发能量的原子谱线与线性玻尔兹曼曲线有很大偏差。其结果可能是由于较低等级激发由热碰撞引起，而另一方面，铁原子高位等级的激发则是铁原子和氩或氖亚稳原子间的碰撞引起的。

关键词：辉光放电等离子体铁原子谱线氖氩玻尔兹曼分布

氦、氩、氪低压激光诱导等离子体激发的空间解析发射图谱的比较

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冶金分析 2009年第3期29卷 5-9页

作者： KITAOKA Chizuru wagatsuma kazuaki 日本东北大学材料研究学院日本仙台980-8577

采用二维成像光谱仪系统,研究了铜(样品)和不同氪、氩或氦气压下激光诱导等离子体气体的发射强度空间分布。发射区的形状和强度完全取决于等离子体气体的种类和气压。这些等离子体气体的发射区基本上集中在样品表面附近,而铜样品的发射... 详细信息

采用二维成像光谱仪系统,研究了铜(样品)和不同氪、氩或氦气压下激光诱导等离子体气体的发射强度空间分布。发射区的形状和强度完全取决于等离子体气体的种类和气压。这些等离子体气体的发射区基本上集中在样品表面附近,而铜样品的发射区则朝周围的气体扩展。氩或氪气压越高,铜线的发射强度越强;而对于氦等离子体,气压越大,铜线的发射强度越弱。上述效应可以通过氪、氩和氦在碰撞激发剖面图上的差别来解释。

关键词：激光诱导等离子体发射光谱法二维图像空间分布铜氪氩氦

Measuring Conditions for the Determination of Lead in Iron-Matrix Samples Using Graphite Atomizers with/without a Platform in Graphite Furnace Atomic Absorption Spectrometry

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American Journal of Analytical Chemistry 2011年第6期2卷 710-717页

作者： Syun Morimoto Tetsuya Ashino kazuaki wagatsuma 不详

In graphite furnace atomic absorption spectrometry (GF-AAS), the atomization process of lead occurring in graphite atomizers with/without a platform plate was investigated when palladium was added to an iron-matrix sample solution containing trace amounts of lead. Absorption profiles of a lead line were meas- ured at various compositions of iron and palladium. Variations in the gas temperature were also estimated with the progress of atomization, by using a two-line method under the assumption of a Boltzmann distribu- tion. Each addition of iron and palladium increased the lead absorbance in both the atomizers, indicating that iron or palladium became an effective matrix modifier for the determination of lead. Especially, palladium played a significant role for controlling chemical species of lead at the charring stage in the platform-type atomizer, to change several chemical species to a single species and eventually to yield a dominant peak of the lead absorbance at the atomizing stage. Furthermore, the addition of palladium delayed the peak after the gas atmosphere in the atomizer was heated to a higher temperature. These phenomena would be because the temperature of the platform at the charring stage was elevated more slowly compared to that of the furnace wall, and also because a thermally-stable compound, such as a palladium-lead solid solution, was produced by their metallurgical reaction during heating of the charring stage. A platform-type atomizer with palladium as the matrix modifier is recommended for the determination of lead in GF-AAS. The optimum condition for this was obtained in a coexistence of 1.0 × 10–2 g/dm3 palladium, when the charring at 973 K and then the atomizing at 3073 K were conducted.

关键词： Graphite Furnace Atomic Absorption Spectrometry Platform Atomizer Gas Temperature Matrix Modifier Lead Iron Palladium

Dissolution of Rare Earth Elements from Coal Fly Ash Particles in a Dilute H<sub>2</sub>SO<sub>4</sub>Solvent

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Open Journal of Physical Chemistry 2013年第2期3卷 69-75页

作者： Shunsuke Kashiwakura Yuichi Kumagai Hiroshi Kubo kazuaki wagatsuma Institute for Materials Research Tohoku University Sendai Japan

Recently, the worldwide supply of rare earth element (REE) resources will be severely restricted. On the other hand, coal fly ash particles emitted from coal-fired electric power plants contain relatively high concentrations of REEs. The contents of REEs in coal fly ash are regularly several hundreds of ppmw. In order to extract and recover REEs from coal fly ash particles, as a first step, we have investigated their dissolution behavior in a dilute H2SO4 solvent. The REE content of coal fly ash specimens has been precisely determined, and their presence in the ash component of the original coal and their enrichment in coal fly ash particles during coal combustion have been suggested. REEs in coal fly ash dissolve gradually in H2SO4 over time, and this implies two types of occurrences of the REEs in coal fly ash particles. By applying the unreacted core model to the dissolution behavior of REEs in a H2SO4 solvent, we can explain both types of occurrences.

关键词： Coal Fly Ash Rare Earth Elements Dissolution Behavior Unreacted Core Model

Mission of the National Cancer Center Hospital in Japan to promote clinical trials for precision medicine

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Cancer Biology & Medicine 2024年第1期21卷 1-3页

作者： kazuaki Shimada Kenichi Nakamura Noboru Yamamoto Department of Hepatobiliary and Pancreatic Surgery National Cancer Center HospitalTokyo 104-0045Japan Clinical Research Support Offce National Cancer Center HospitalTokyo 104-0045Japan Department of Experimental Therapeutics National Cancer Center HospitalTokyo 104-0045Japan

Precision medicine is a growing field *** its potential benefit to many patients,several major obstacles must be overcome before precision medicine can be more widely used in clinical *** main obstacles are associated... 详细信息

关键词： clinical Cancer overcome

A dynamic database of solid-state electrolyte(DDSE)picturing all-solid-state batteries

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Nano Materials Science 2024年第2期6卷 256-262页

作者： Fangling Yang Egon Campos dos Santos Xue Jia Ryuhei Sato kazuaki Kisu Yusuke Hashimoto Shin-ichi Orimo Hao Li Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan Key Laboratory of Radiation Physics and Technology Ministry of EducationCollege of PhysicsSichuan UniversityChengdu610065People's Republic of China Institute for Materials Research(IMR) Tohoku UniversitySendai980-8577Japan Tohoku Forum for Creativity Tohoku UniversitySendai980-8577Japan

All-solid-state batteries(ASSBs)are a class of safer and higher-energy-density materials compared to conventional devices,from which solid-state electrolytes(SSEs)are their essential *** date,investigations to search for high ion-conducting solid-state electrolytes have attracted broad ***,obtaining SSEs with high ionic conductivity is challenging due to the complex structural information and the less-explored structure-performance *** provide a solution to these challenges,developing a database containing typical SSEs from available experimental reports would be a new avenue to understand the structureperformance relationships and find out new design guidelines for reasonable ***,a dynamic experimental database containing>600 materials was developed in a wide range of temperatures(132.40–1261.60 K),including mono-and divalent cations(e.g.,Li^(+),Na^(+),K^(+),Ag^(+),Ca^(2+),Mg^(2+),and Zn^(2+))and various types of anions(e.g.,halide,hydride,sulfide,and oxide).Data-mining was conducted to explore the relationships among different variates(e.g.,transport ion,composition,activation energy,and conductivity).Overall,we expect that this database can provide essential guidelines for the design and development of high-performance SSEs in ASSB *** database is dynamically updated,which can be accessed via our open-source online system.

关键词： Solid-state electrolyte(SSE) All-solid-state battery(ASSB) Ionic conductivity Dynamic database Machine learning

Co-infection with Neisseria mucosa in a patient with tuberculous otitis media

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Journal of Otology 2024年第1期19卷 1-4页

作者： Tatsuya Hioki kazuaki Soejima Yuki Goto Makoto Sugiura Takumi Umemura Yoshimi Ishihara Yoshikazu Mutoh Daisuke Sakanashi Hiroshige Mikamo Department of Clinical Laboratory Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Respiratory Medicine and Allergy Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Otolaryngology Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infection Control Team Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infectious Diseases Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infection Prevention and Control Aichi Medical University Hospital1-1 YazakokarimataNagakuteAichi480-1195Japan Department of Clinical Infectious Diseases Aichi Medical University1-1 YazakokarimataNagakuteAichi480-1195Japan

Tuberculous otitis media(TOM) is a rare manifestation caused by Mycobacterium tuberculosis with low incidence rates among extrapulmonary tuberculosis cases. Diagnosis is often delayed because of the presence of several clinical manifestations and the high prevalence of secondary bacterial infections. Few reports have attributed secondary bacterial infections in patients with TOM to commensal Neisseria. Thus, understanding the pathogenic mechanisms and clinical features of commensal Neisseria is important, considering its recent presentation as an infection-causing pathogen. Neisseria mucosa is a commensal inhabitant in humans and is generally considered non-pathogenic but can cause infection in rare cases. Here, we report an atypical secondary infection caused by Neisseria mucosa in an 81-year-old woman with TOM being treated for pulmonary tuberculosis. Direct purulent otorrhea smear microscopy revealed no acid-fast bacilli using Ziehl-Neelsen staining, whereas the phagocytosis of gram-negative cocci by white blood cells was confirmed using Gram staining. Otorrhea culture revealed the growth of N. mucosa. Subsequently, M. tuberculosis infection in the otorrhea was identified using a culture-based method. Vigilance is critical for the early detection of TOM to prevent further complications. This report raises awareness regarding TOM and provides insight into the pathogenicity of N. mucosa in otitis media.

关键词： Commensal neisseria Miliary tuberculosis Mycobacterium tuberculosis Neisseria mucosa Tuberculous otitis media

Data-Driven Viewpoint for Developing Next-Generation Mg-Ion Solid-State Electrolytes

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电化学（中英文） 2024年第7期30卷 38-49页

作者： Fang-Ling Yang Ryuhei Sato Eric Jianfeng Cheng kazuaki Kisu Qian Wang Xue Jia Shin-ichi Orimo Hao Li Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai980-8577Japan College of Physics Sichuan UniversityChengdu610065China Institute for Materials Research(IMR) Tohoku UniversitySendai980-8577Japan College of Materials Science and Engineering Sichuan UniversityChengdu610064China

Magnesium(Mg)is a promising alternative to lithium(Li)as an anode material in solid-state batteries due to its abundance and high theoretical volumetric ***,the sluggish Mg-ion conduction in the lattice of solidstate electrolytes(SSEs)is one of the key challenges that hamper the development of Mg-ion solid-state *** various Mg-ion SSEs have been reported in recent years,key insights are hard to be derived from a single literature ***,the structure-performance relationships of Mg-ion SSEs need to be further unraveled to provide a more precise design guideline for *** this viewpoint article,we analyze the structural characteristics of the Mg-based SSEs with high ionic conductivity reported in the last four decades based upon data mining-we provide big-data-derived insights into the challenges and opportunities in developing next-generation Mg-ion SSEs.

关键词： Data mining Magnesium-ion solid-state electrolytes All-solid-state batteries Magnesium-ion conductivity