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Accelerated biodegradation of nitrophenols in the rhizosphere of Spirodela polyrrhiza

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Journal of Environmental Sciences 2012年第5期24卷 800-807页

作者： Risky Ayu Kristanti Masahiro Kanbe Tadashi Toyama yasuhiro tanaka Kazuhiro Mori Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi 4-3-11 Takeda Kofu Yamanashi 400-8511 Japan

We investigated the biodegradation of 2-nitrophenol （2-NP）, 4-nitrophenol （4-NP）, and 2,4-dinitrophenol （2,4-DNP） in the rhizosphere of Spirodela polyrrhiza plants by conducting degradation experiments with three river water samples supplemented with each nitrophenol （NP）. We then isolated NP-degrading bacteria both from the S. polyrrhiza roots and from the river water. In the river water samples, removal of the three NP was accelerated in the presence of S. polyrrhiza plants. The three NPs persisted in an autoclaved solution with sterile plants suggests that NP removal was accelerated largely by bacterial NP biodegradation rather than by adsorption and uptake by the plants. We isolated 8 strains of NP-degrading bacteria： 6 strains from the S. polyrrhiza roots and 2 strains from river water without the plants. The 2-NP- and 2,4-DNP-degrading bacteria were isolated only from the S. polyrrhiza roots. The 4-NP- degrading bacteria different from those isolated from the river water samples were also found on S. polyrrhiza roots. The 2-NP- and 4-NP-degrading strains isolated from the roots utilized the corresponding NP （0.5 mmol/L） as the sole carbon and energy source. The 2,4-DNP-degrading strains isolated from the roots showed substantial 2,4-DNP-degrading activity, but the presence of other carbon and energy sources was required for their growth. The isolated NP-degrading bacteria from the roots must have contributed to the accelerated degradation of the three NPs in the rhizosphere of S. polyrrhiza. Our results suggested that rhizoremediation with S. polyrrhiza may be effective for NP-contaminated surface water.

关键词： Spirodela polyrrhiza rhizosphere nitrophenol biodegradation

Guest Editorial:Advanced Materials for HVDC Insulation

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High Voltage 2020年第4期5卷 351-352页

作者： Du, Boxue Wang, Qing Tu, Youping tanaka, yasuhiro Li, Jin Institute of High Voltage School of Electrical and Information Engineering Tianjin University China Materials Science and Engineering Department of Materials Science and Engineering Pennsylvania State University United States Department of Electrical Engineering North China Electric Power University China Measurement and Electric Machine Control Laboratory Tokyo City University Japan School of Electrical and Information Engineering Tianjin University China

The rapid increase in both voltage level and capability of HVDC power transmission and transformation equipment poses great challenges to both integration and reliability of power *** insulation systems deployed along with these equipments have to withstand the severe electric field distortion,higher temperature rise and greater mechanical stress,*** insulation materials with unique comprehensive performance provide effective solutions to meet new ***,investigating the dielectric properties,determining the failure mechanisms,and exploring novel insulation materials become the core issues in developing more capable insulation systems.

关键词： insulation dielectric power

Effect of sinusoidal waveform and frequency on space charge characteristics of polyimide

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High Voltage 2021年第5期6卷 760-769页

作者： Hanwen Ren yasuhiro tanaka Hiroaki Miyake Qingmin Li Haoyu Gao Chengqian Li Zhongdong Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Tokyo City University 1-28-1 TamazutsumiSetagayaTokyoJapan School of Electrical and Electronic Engineering The University of ManchesterManchesterUK

The charge phenomena under sine and half‐wave sine voltages within the frequency range of 500 Hz are studied *** on the pulsed electro‐acoustic method,the traditional circuit design under high-frequency voltages is first *** is found that the selection of a 186 pF protection capacitor and a 333 kΩprotection resistor can ensure that the actual voltage applied to the sample is consistent with the expected *** on this design,experimental results show that the polarity of the charge accumulated in the depth of the sample is determined by that of the upper *** results under special voltages with different amplitudes and frequencies indicate that the amount of accumulated charge under sine voltages are larger than those under positive and negative half-wave sine and DC conditions,and the samples under lower-frequency conditions show more charge *** maximum electric field strengths appear at 90 and 270 degrees of the sine voltage with a frequency of 10 Hz,and their values are 68.55 and 81.82 kV/mm,***,the charge characteristics are easily affected by the voltage’s waveform and frequency *** results obtained here can provide guidance for the application of insulating materials under special voltage environments.

关键词： parameters. charge polyimide

How are multiple satellites seen from the ground? Relative apparent motion and formation stabilization

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Astrodynamics 2024年第1期8卷 121-134页

作者： Kenta Nakajima yasuhiro Yoshimura Hongru Chen Toshiya Hanada Department of Aeronautics and Astronautics Kyushu University744 Motooka Nishi-kuFukuoka819-0395Japan

This paper answers how multiple satellites are seen from the ground. This question is inspired by space-advertising, a public exhibition in the night sky using a dot matrix of satellites that are bright enough to be seen by the naked eye. Thus, it is important for space advertisement that the specific dot matrix is seen. Moreover, the stability of the dot matrix during a visible span is very valuable. To stabilize the dot matrix, this study formulates an apparent position of a dot from a representative dot seen from the ground. The formulation, linear functions of a set of relative orbital elements, reveals the appearance of the dot matrix. The proposed relative variable in the formulation drives the instability of the dot matrix, thereby revealing an initial stable configuration of deputies from a chief. The arbitrary dot matrix designed using the configuration is stable even at low elevations without orbital control during the visible span.

关键词： formation flying relative motion stabilization astrodynamics multi-apparent motions space advertisement

Liver biopsy in the post-hepatitis C virus era in Japan

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World Journal of Gastroenterology 2024年第14期30卷 1949-1957页

作者： Yoshihiro Ikura Takako Okubo yasuhiro Sakai Department of Pathology Takatsuki General HospitalTakatsuki 569-1192Osaka PrefectureJapan Department of Pathology Kansai Medical University Medical CenterMoriguchi 570-8507Japan

In Japan,liver biopsies were previously crucial in evaluating the severity of hepatitis caused by the hepatitis C virus(HCV)and diagnosing HCV-related hepatocellular carcinoma(HCC).However,due to the development of effective antiviral treatments and advanced imaging,the necessity for biopsies has significantly *** change has resulted in fewer chances for diagnosing liver disease,causing many general pathologists to feel less confident in making liver biopsy *** article provides a comprehensive overview of the challenges and potential solutions related to liver biopsies in ***,it highlights the importance of considering steatotic liver diseases as independent conditions that can coexist with other liver diseases due to their increasing ***,it emphasizes the need to avoid hasty assumptions of HCC in nodular lesions,because clinically diagnosable HCCs are not targets for ***,the importance of diagnosing hepatic immune-related adverse events caused by immune checkpoint inhibitors is increasing due to the anticipated widespread use of these *** conclusion,pathologists should be attuned to the changing landscape of liver diseases and approach liver biopsies with care and attention to detail.

关键词： Liver biopsy Alteration Post-hepatitis C virus era Steatotic liver disease Hepatic tumors Immune checkpoint inhibitors

Pockels效应表面电荷测量中电荷反演算法的研究

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中国电机工程学报 2011年第13期31卷 135-141页

作者：穆海宝张冠军郑楠田中康宽电力设备电气绝缘国家重点实验室(西安交通大学) 陕西省西安市710049 日本东京都市大学测量与电机控制实验室

Pockels效应表面电荷测量技术以其特有的技术优势逐步用于表面放电和等离子体的研究,然而如何准确获取表面电荷分布仍然是一个重要的研究课题。对Pockels效应表面电荷测量技术中的表面电荷反演算法进行研究,采用二维傅里叶变换将测量信... 详细信息

Pockels效应表面电荷测量技术以其特有的技术优势逐步用于表面放电和等离子体的研究,然而如何准确获取表面电荷分布仍然是一个重要的研究课题。对Pockels效应表面电荷测量技术中的表面电荷反演算法进行研究,采用二维傅里叶变换将测量信号和表面电荷的复杂关系转换到频域中进行计算,并采用维纳滤波算法进行信号处理。计算结果和传统算法的计算结果进行了对比,结果表明,改进算法在数值计算过程中考虑材料厚度、介电特性及不同位置电荷影响等因素,计算方法更为合理。该方法可用于不同材料表面电荷的测量计算。另外,算法中维纳滤波器是计算算法中关键的组成部分,对降低系统噪声,提高数值计算的稳定性能够起到很重要的作用。

关键词： Pockels效应表面电荷测量二维傅里叶变换维纳滤波

Geomorphological evidence inconvenient for the antecedent rivers of the Arun and Tista across the Himalayan range

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Journal of Mountain Science 2024年第9期21卷 3001-3017页

作者： NAKATA Takashi KUMAHARA yasuhiro NAIK Sambit Prasanajit SAKAI Harutaka Graduate School of Humanities and Social Sciences Hiroshima UniversityHigashi-Hiroshima 739-8522Japan Active Fault and Earthquake Hazard Mitigation Research Center Pukyong National UniversityBusan 48513South Korea Department of Petroleum Engineering and Earth Sciences University of Petroleum and Energy StudiesDehradun 248007India Graduate School of Science Kyoto UniversityKyoto 606-8502Japan

The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan *** clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan *** southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher *** 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m *** Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by *** the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting *** fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.

关键词： Himalaya Antecedent river Geomorphology AW3D30 DSM Glacier piracy

环氧树脂/富勒烯纳米复合材料空间电荷注入特性

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中国电机工程学报 2022年第13期42卷 4974-4981页

作者：李进王雨帆杜伯学孔晓晓杨威尹立田中康宽智能电网教育部重点实验室(天津大学电气自动化与信息工程学院) 天津市南开区300072 先进输电技术国家重点实验室(全球能源互联网研究院有限公司) 北京市昌平区102209 东京都市大学测量与电机控制实验室日本东京158-8557

高温与强电场作用下环氧树脂绝缘空间电荷注入诱发电场畸变,加剧绝缘劣化甚至引起击穿放电故障,严重威胁电力、电子设备安全稳定运行。纳米掺杂在提升环氧树脂复合材料介电性能方面表现优异,但高温与强电场下纳米复合材料的空间电荷注... 详细信息

高温与强电场作用下环氧树脂绝缘空间电荷注入诱发电场畸变,加剧绝缘劣化甚至引起击穿放电故障,严重威胁电力、电子设备安全稳定运行。纳米掺杂在提升环氧树脂复合材料介电性能方面表现优异,但高温与强电场下纳米复合材料的空间电荷注入抑制效果及机理仍有待进一步证实与分析。该文制备了不同含量富勒烯(C_(60))掺杂的环氧树脂纳米复合材料,采用改进的电声脉冲法研究其在高温(80℃、150℃)和强电场(100、150kV/mm)条件下空间电荷注入与积聚特性。结果表明,C_(60)的引入对高温、强电场下环氧树脂绝缘电荷注入和积累有明显的抑制作用。基于密度泛函理论计算分析环氧树脂和富勒烯的分子轨道能级和3D电势分布规律,发现C_(60)量子点能够调控EP/C_(60)纳米复合材料电荷输运行为,抑制载流子的注入,减少空间电荷的积累。上述试验和仿真结果证明,掺杂C_(60)可以有效改善环氧树脂绝缘高温和强电场下空间电荷注入特性。

关键词：高温强场环氧树脂空间电荷富勒烯分子能级 3D静电势量子点

Geomorphological evidence inconvenient for the antecedent rivers of the Arun and Tista across the Himalayan range

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Journal of Mountain Science 2024年第09期 3001-3017页

作者： NAKATA Takashi KUMAHARA yasuhiro NAIK Sambit Prasanajit SAKAI Harutaka Graduate School of Humanities and Social Sciences Hiroshima University Active Fault and Earthquake Hazard Mitigation Research Center Pukyong National University Department of Petroleum Engineering and Earth Sciences University of Petroleum and Energy Studies Graduate School of Science Kyoto University

The Arun and Tista Rivers, which flow across the Himalayas, are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan ranges. To clarify whether the idea of antecedent rivers is acceptable, we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan Himalayas. The southern part of Tibetan Plateau, extending across the Himalayas as tectonically un-deformed glaciated terrain named as 'Tibetan Corridor,' does not suggest the regional uplift of the Higher Himalayas. The 8,000-m class mountains of Everest, Makalu, and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m high. The Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by glaciation. For the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range, it is hard to collect enough water for the power of down-cutting their channels against the uplifting Himalayas. The fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma, and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.

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