检索结果-南通市图书馆

Green and Sustainable Chemistry 2013年第1期3卷 19-25页

作者： Katsuya Konno Kaoru Onoe Yasuyuki Takiguchi tatsuaki yamaguchi Department of Life and Environmental Sciences Faculty of Engineering Chiba Institute of Technology Chiba Japan Hitachi Automotive Systems Ltd. Automotive Systems R&D Laboratory Kawasaki Japan

Methane was decomposed to hydrogen and carbon nanotubes (CNTs) by microwave plasma, using Fe/Si catalyst activated by biased (—150 V) hydrogen plasma for various treatment times. Upon exposure to biased hydrogen plasma, the catalyst surface becomes lumpy within 1 min, coheres between 5 and 10 min and forms particles after 20 min. The methane conversion increased up to 93% over the treatment time of 5 min. The hydrogen yield showed as similar tendency as the methane conversion and kept 83% at treatment time of 5 min. The treatment time up to 1 min increased the amount of deposited carbon, and after treatment time of 5 min it dropped;then again after treatment time of 20 min, it increased to reach a maximum value of 22 gc/gcat. Deposited carbon was found to be consisted of carbon nanotubes. It grew vertically on the catalyst surface and reached a maximum length of 30.7 nm after treatment time of 10 min. Multiple types of CNTs were present, and the CNT diameters decreased with increasing plasma treatment time.

关键词： Hydrogen Methane Decomposition Carbon Nanotubes Microwave Plasma Methane H2 Plasma Treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用木素或其衍生物制造活性炭的方法

林产化工通讯 1992年第1期26卷 37-38页

作者： yamaguchi tatsuaki 钱慧娟

本专利是关于简便制取高性能活性炭的制造工艺,所得产品可作为各种物质的吸附剂,具有多种用途。作者针对以木素或其衍生物为原料制备具有大表面积活性炭的工艺进行了广泛研究,並获得了成功。本发明的活性炭的制造方法是将碱加入木素或... 详细信息

本专利是关于简便制取高性能活性炭的制造工艺,所得产品可作为各种物质的吸附剂,具有多种用途。作者针对以木素或其衍生物为原料制备具有大表面积活性炭的工艺进行了广泛研究,並获得了成功。本发明的活性炭的制造方法是将碱加入木素或其衍生物中,通过热处理制取活性炭。附图指出了由例12所制得的活性炭孔径大小分布和累积孔容曲线。众所周知。

关键词：活性炭木素木素衍生物

Comparison of Cellulose Decomposition by Microwave Plasma and Radio Frequency Plasma

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Green and Sustainable Chemistry 2011年第3期1卷 85-91页

作者： Katsuya Konno Hajime Onodera Kazuhisa Murata Kaoru Onoe tatsuaki yamaguchi 不详

Biomass conversion by plasma has the advantage of mainly producing gaseous products, H2, CO and CO2. Though the thermal plasma has been used for this conversion, the plasma temperature is too high to be unfit for the conversion biomass. The temperature of cold plasma, however, is lower under 3000 K. It expects to be adequate for biomass conversion. Cold plasma can be obtained with irradiation microwave (2.45 GHz) or radio frequency (13.5 MHz) under reduce gas pressure. Therefore, in present study, the effective decomposition of cellulose by microwave plasma (MWP) and radio frequency plasma (RFP) is examined. The conversion of cellulose by MWP (XMWP) is higher than that by RFP (XRFP), irrespective of the reaction time. XMWP and XRFP reach 92.8 wt% at 10 min and 68.1 wt% at 30 min. The maximum yield of gaseous products (Ygas) by MWP is 85.1 wt% at 10 min, higher by 23.2 wt% than Ygas by RFP at 30 min. The amount of H2 and CO obtained by MWP is 18.0 mmol/g and 23.5 mmol/g, it is larger than that obtained by RFP. Comparing the relationship between conversion and yield, Ygas of MWP is slightly higher than that of RFP under X of 60 wt%, and both Ygas is almost same over 60 wt%. The amount of H2 and CO obtained by MWP is larger by 9.3 mmol/g and 9.6 mmol/g than that obtained by RFP. C, H and O element in cellulose is mainly distributed to H2 and CO by MWP. RFP mainly distributes H and O element to the other gases without H2 and CO. In addition, a large amount of C element is remains in the residue. Those results is found that MWP was more suitable for cellulose gasification than RFP, since MWP can highly convert C, H and O element to H2 and CO by higher energy of microwave frequency in comparison with radio frequency.

关键词： Microwave Plasma Radio Frequency Plasma Cellulose

Regioselective Direct Carboxylation of 2-Naphthol with Supercritical CO2in the Presence of K2CO3

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Organic Chemistry 2013年第3期3卷 210-213页

作者： Shigeki Furukawa Kensuke Otokawa Osamu Sasaki Ken Nakayasu tatsuaki yamaguchi College of Industrial Technology Nihon University Chiba Japan Faculty of Engineering Chiba Institute of Technology Chiba Japan Faculty of Engineering Chiba Institute of Technology Chiba Japan Instrumental Analysis Division Center for Supports to Research and Education Activities Kobe University Kobe Japan

A direct regioselective preparation of 2-hydroxynaphthalene-6-carboxylic acid, a useful industrial intermediate of aro-matic polyester from 2-naphthol was conducted by use of excess amount of K2CO3 (10-fold molar to 2-naphthol) under supercritical CO2 at 10 MPa and 473 K. The obtained yield under this condition was ca. 20 mol% to 2-naphthol. The further investigations may provide an alternative process to the conventional Kolbe-Schmitt reaction, because of no use of strong alkali and recoverability of K2CO3. Theoretical explanation about the regioselectivity was achieved by means of DFT calculations.

关键词： Supercritical CO2 CO2 Utilization Kolbe-Schmitt Reaction Carboxylation 2-Naphthol Potassium Carbonate 2-Hydroxynaphthalene-6-carboxylic Acid DFT Calculation

Short-Time Preparation of NaOH-Activated Carbon from Sugar Cane Bagasse Using Microwave Plasma Heating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green and Sustainable Chemistry 2017年第4期7卷 259-269页

作者： Katsuya Konno Yusuke Oike Yasutaka Ohba Osamu Sasaki Yasuyuki Takiguchi Kaoru Onoe tatsuaki yamaguchi Department of Life and Environmental Sciences Faculty of Engineering Chiba Institute of Technology Chiba Japan (Present Address) Hitachi Automotive Systems Ltd. Advanced Development Centre Kawasaki Japan

The microwave induced argon plasma was applied to the preparation of NaOH-activated carbon from sugar cane bagasse. The distinguished feature of the heating technique with this cold plasma is the short operation time. The carbonization and the activation process were finalized in one step within 3 min. The prepared activated carbon with NaOH ratio 3 to bagasse characterized using N2 adsorption of type IV (IUPAC classification) to give specific surface area of 1980 m2/g and mesopore volume of 0.73 ml/g. It also showed a higher specific capacitance of 201 F/g in 1 M H2SO4 solution (with standard three electrodes) than the corresponding one by the conventional heating, previously reported. The other features were the absence of oxygen groups and the presence of carbon centered stable radicals, detected by ESR spectra, on the surface.

关键词： Bagasse Plasma Heating NaOH Activated Carbon EDLC Free Radical

Linking of Chemical Reactions and Silica Nanoparticle Contact Using Synthetic Helical Molecules

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第15期42卷 1781-1796页

作者： Sheng Zhang Ming Bao Mieko Arisawa Masahiko yamaguchi state Key Laboratory of Fine Chemicals Dalian University of TechnologyDalianLiaoning 116024China Department of Bioscience and Biotechnology Graduate Schoolof Bioresource and Bioenvironmental SciencesKyushu UniversityFukuoka 819-0395Japan

Biological cells exhibit diverse phenomena induced through linking of chemical reactions of molecules and solid surface *** is then a significant topic in the field of chemistry to study phenomena induced through this linking using synthetic systems,which can promote our understanding of biological phenomena and can be applied to the development of novel *** nanoparticles(sNPs),which are synthetic inorganic materials,are attractive for such purposes,because of their following characteristics:they can adsorb large amounts of molecules on their surfaces,they can aggregate through contact between SNPs as well as contact between molecules and SNPs,and the molecules can be easily removed from solutions by *** contact of sNP surfaces with molecules then affects chemical reactions of molecules and also behaviors of *** article describes systems derived from synthetic helical molecules and sNPs,which exhibit notable phenomena including selective adsorption and molecular recognition,equilibrium shift,step kinetics with induction period,precipitation with flow and sweeping,and disaggregation and desorption by sonication,in which the high affinity of helical molecules with sNP surfaces plays important *** models that explain the phenomena are *** applications are also discussed,including the separation of molecules,capture of intermediates,the storage and release of molecules,equilibrium shift,clocking,and the translation of mechanical stimulations into chemical reactions.

关键词： Silica nanoparticles Chemical reactions Molecular recognition Linking Nanoparticles Adsorption Chirality Precipitation

A plant growth chamber system equipped with aerosol generators for studying aerosol-vegetation interactions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第2期85卷 122-132页

作者： Masao Gen Seiji Ikawa Masahiro yamaguchi Fong Zyin Lim Takeshi Izuta I.Wuled Lenggoro Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyo184-8588Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai980-8577Japan Faculty of Agriculture Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509Japan Graduate School of Fisheries and Environmental Sciences Nagasaki UniversityNagasaki852-8521Japan Institute of Agriculture Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509 Japan Department of Applied Physics and Chemical Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyo184-8588Japan Institute of Global Innovation Research Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509Japan

Understanding aerosol-vegetation interactions is vital in ***,the interactions remain elusive partly due to the lack of suitable plant growth chamber ***,deposition of submicron particles on leaf surfaces is challenging due to its low deposition velocities compared to larger *** this work,we present a plant-growth chamber that was used to study the effect of sub-micron black carbon(BC)particles on the growth and photosynthesis of *** chamber system simultaneously enables the growth of multiple plants in pots and the deposition of submicron particles onto *** spraying methods assisted by ultrasonic and electrostatic forces were employed as aerosol generators to realize the particle *** flow regime inside the chamber was numeri-cally calculated to predict the transportation of aerosol particles,suggesting the optimal operating conditions of the *** gas-phase particle size distribution measurements showed that gener-ated BC particles were suspended in submicron diameter *** aerosol generators were examined in the chamber using three conductor and insulator substrates as a model of plant *** observations and spectroscopic analysis ascertained that submicron BC particles generated from our generators were deposited on all substrate *** the developed chamber system,systematic studies can be performed to advance the fundamental understanding of aerosol-vegetation interactions.

关键词： Aerosol Exposure chamber Spray drying Black carbon

Computer-controlled ultra high voltage amplifier for dielectric elastomer actuators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomimetic Intelligence & Robotics 2024年第1期4卷 14-23页

作者： Ardi Wiranata Zebing Mao Yu Kuwajima Yuya yamaguchi Muhammad Akhsin Muflikhun Hiroki Shigemune Naoki Hosoya Shingo Maeda Department of Mechanical and Industrial Engineering University of Gadjah MadaYogyakarta 55281Indonesia Department of Mechanical Engineering Tokyo Institute of TechnologyTokyo 152-8550Japan Department of Engineering and Science Shibaura Institute of TechnologyTokyo 135-8548Japan Department of Electrical Engineering Shibaura Institute of TechnologyTokyo 135-8548Japan Department of Engineering Science and Mechanics Shibaura Institute of TechnologyTokyo 135-8548Japan Living Systems Materialogy(LiSM)Research Group International Research Frontiers Initiative(IRFI)Tokyo Institute of TechnologyYokohama 226-8501Japan

Soft robotics is a breakthrough technology to support human-robot *** soft structure of a soft robot can increase safety during human and robot *** of the promising soft actuators for soft robotics is dielectric elastomer actuators(DEAs).DEAs can operate silently and have an excellent energy *** simple structure of DEAs leads to the easy fabrication of soft *** simplicity combined with silent operation and high energy density make DEAs interesting for soft robotics *** actuation follows the Maxwell-pressure *** pressure produced in the DEAs actuation depends much on the voltage *** DEAs requires high voltage to gain an *** the power consumption of DEAs is in the milli-Watt range,the current needed to operate the DEAs can be *** commercially available DC-DC converters can convert the volt range to the kV *** order to get a voltage in the 2-3 kV range,the reliable DC-DC converter can be pricy for each *** problem hinders the education of soft actuators,especially for a newcomer laboratory that works in soft electric *** paper introduces an entirely do-it-yourself(DIY)Ultrahigh voltage amplifier(UHV-Amp)for education in soft ***-Amp can amplify 12 V to at a maximum of 4 kV *** a demonstration,we used this UHV-Amp to test a single layer of powdered-based *** strategy to build this educational type UHV-Amp was utilizing a Cockcroft-Walton circuit structure to amplify the voltage range to the kV *** its current state,the UHV-Amp has the potential to achieve approximately 4 *** created a simple platform to control the UHV-Amp from a personal *** near future,we expect this easy control of the UHV-Amp can contribute to the education of soft electric actuators.

关键词： Dielectric elastomer actuators Electric amplifier Soft actuators Soft robotics Soft actuator education

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

草炭与风化炭改良盐碱土的生态效应

生态农业研究 2000年第2期8卷 34-37页

作者：吴龙华王桂荣张春兴西崎泰山口达明中国科学院沈阳应用生态研究所沈阳110015 日本千叶工业大学

采用草炭和风化炭进行改良盐碱土的盆栽试验。结果表明,施用草炭、风化炭使土壤盐分略有上升,主要使Ca^(2+)和Na^+增加;土壤有机质含量因草炭、风化炭的施用而增加,且与有机物料的用量呈正相关关系;土壤速效氮、速效磷、速效钾含量也均... 详细信息

采用草炭和风化炭进行改良盐碱土的盆栽试验。结果表明,施用草炭、风化炭使土壤盐分略有上升,主要使Ca^(2+)和Na^+增加;土壤有机质含量因草炭、风化炭的施用而增加,且与有机物料的用量呈正相关关系;土壤速效氮、速效磷、速效钾含量也均随有机物料的施用而增加。水稻株高、穗长和每穗粒数均有所增加,水稻籽实产量显著提高。

关键词：草炭风化炭盐碱土盐分养分水稻产量

东北地区内陆苏打盐渍土旱作玉米实施泥炭改良的研究

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

生态学杂志 1998年第1期17卷 16-21页

作者：金凤鹤西崎泰山口达明尹怀宁白鸿祥郑应顺千叶工业大学工学部辽宁师范大学地理系

东北地区内陆苏打盐渍土旱作玉米实施泥炭改良的研究金凤鹤西崎泰山口达明尹怀宁白鸿祥郑应顺（千叶工业大学工学部，日本）（辽宁师范大学地理系，大连１１６０２９）ＳｔｕｄｙｏｆＡｐｐｌｙｉｎｇＰｅａｔＡｍｅｌｉｏｒａｔｉｏｎ... 详细信息

东北地区内陆苏打盐渍土旱作玉米实施泥炭改良的研究金凤鹤西崎泰山口达明尹怀宁白鸿祥郑应顺（千叶工业大学工学部，日本）（辽宁师范大学地理系，大连１１６０２９）ＳｔｕｄｙｏｆＡｐｐｌｙｉｎｇＰｅａｔＡｍｅｌｉｏｒａｔｉｏｎｉｎＳｏｄａ＿ＳｏｌｏｎｃｈａｋＣ...

关键词：玉米盐渍土苏打泥炭土地改良旱地