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MODELING NONLINEAR DYNAMICS OF CIRCULATING FLUIDIZED BEDS USING NEURAL NETWORKS

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Particuology 2005年第Z1期 84-89+6页

作者： atsushi tsutsumi Kentaro Otawara Department of Chemical System Engineering The University of Tokyo Tokyo 113-8656 Japan Project Management Division Kureha Technol. Eng. Co. Iwaki 974-8232 Japan

In the present work, artificial neural networks (ANNs) were proposed to model nonlinear dynamic behaviors of local voidage fluctuations induced by highly turbulent interactions between the gas and solid phases in circulating fluidized beds. The fluctuations of local voidage were measured by using an optical transmittance probe at various axial and radial positions in a circulating fluidized bed with a riser of 0.10 m in inner diameter and 10 m in height. The ANNs trained with experimental time series were applied to make short-term and long-term predictions of dynamic characteristics in the circulating fluidized bed. An early stop approach was adopted to enhance the long-term prediction capability of ANNs. The performance of the trained ANN was evaluated in terms of time-averaged characteristics, power spectra, cycle number and short-term predictability analysis of time series measured and predicted by the model.

关键词： circulating fluidized beds (CFBs) hydrodynamics nonlinear dynamics ANNs modeling

High-density circulating fluidized bed gasifier for advanced IGCC/IGFC-Advantages and challenges

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Particuology 2010年第6期8卷 602-606页

作者： Guoqing Guan Chihiro Fushimi atsushi tsutsumi Masanori Ishizuka Satoru Matsuda Hiroyuki Hatano Yoshizo Suzuki Collaborative Research Center for Energy Engineering Deportment of Mechanical and Biolhnctional Systems Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguoro-ku Tokyo 153-8505Japan Clean Gas Group National Institute of Advanced Industrial Science and Technology 16- 1 Onogawa Tsukuba Iboraki 305-8569Japan

Coal-fired Integrated Gasification Combined Cycle （IGCC） and Integrated coal Gasification Fuel-cell Com- bined cycle （IGFC） are being developed as high-efficiency electric power generation technology. However, the highest theoretical gross thermal efficiency of the conventional IGCC]IGFC is still below 52~. In order to obtain higher power generation efficiency, an advanced IGCC （A-IGCC） or advanced IGFC （A-IGFC） sys- tem making use of the exergy recuperation concept by recycling waste heat from gas turbine or fuel cells for steam gasification of coal and biomass was proposed in our laboratory, Corresponding to this system, a novel high-density triple-bed combined circulating fluidized bed （TBCFB） gasifier, composed of a downer pyrolyzer, a bubbling fluidized bed char gasifier, and a riser combustor, was proposed to replace traditional gasifiers such as the entrained flow bed gasifier. The new system is expected to more effectively utilize the waste heat from gas turbines or fuel cells and the heat produced by the combustion of the unreacted char in the riser combustor for pyrolysis and gasification of coal and biomass. In this short review, the advantages and future challenges in the development of high-density TBCFB gasifier are presented and discussed.

关键词： IGCC/IGFC High-density circulating fluidized bed Gasifier Riser Downer Bubbling fluidized bed Exergy recuperation Biomass Coal

用石蜡-CO_2超临界流体快速膨胀在流化床中进行细颗粒包覆

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化工学报 2001年第1期52卷 50-55页

作者：王亭杰堤敦司金涌清华大学化学工程系北京100084 东京大学化学系统工程系

对超临界流体快速膨胀技术在流化床中进行细颗粒的表面包覆进行了研究 ,以实现细颗粒中关键成分的有效控制释放 .实验研究了含有包覆剂———石蜡的超临界二氧化碳流体通过微细喷嘴快速膨胀到装有细颗粒的流化床中 ,膨胀射流中所产生的... 详细信息

对超临界流体快速膨胀技术在流化床中进行细颗粒的表面包覆进行了研究 ,以实现细颗粒中关键成分的有效控制释放 .实验研究了含有包覆剂———石蜡的超临界二氧化碳流体通过微细喷嘴快速膨胀到装有细颗粒的流化床中 ,膨胀射流中所产生的微核在细颗粒表面均匀沉积 ,形成细颗粒表面薄层包覆 .结果分析表明 ,超临界流体快速膨胀前的温度是包覆过程的关键参数。

关键词：包覆控制释放超临界流体快速膨胀细颗粒流化床石蜡二氧化碳造粒

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超临界流体快速膨胀用于细颗粒包覆技术

化工进展 2000年第4期19卷 42-47页

作者：王亭杰堤敦司金涌清华大学化工系北京100084 Department of chemical system Engineering The University of TokyoTokyo

研究超临界流体在快速膨胀过程中的热力学状态变化，超临界流体在喷嘴端部快速膨胀过程中温度急剧降低，在一定条件下，降低的温度与流体体积流率平方成线性关系。超临界流体在快速膨胀射流中产生数十纳米量级的微核颗粒，流体膨胀前温... 详细信息

研究超临界流体在快速膨胀过程中的热力学状态变化，超临界流体在喷嘴端部快速膨胀过程中温度急剧降低，在一定条件下，降低的温度与流体体积流率平方成线性关系。超临界流体在快速膨胀射流中产生数十纳米量级的微核颗粒，流体膨胀前温度对微核粒径有显著影响。通过超临界流体在流化床中的快速膨胀，使包覆剂微核在颗粒表面形成均匀的薄膜色覆，实现颗粒或颗粒中关键组分在溶剂中的控制释放。

关键词：超临界流体包覆流化床细颗粒快速膨胀

New approach to resolve the amount of Quaternary uplift and associated denudation of the mountain ranges in the Japanese Islands

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Geoscience Frontiers 2016年第2期7卷 197-210页

作者： Shigeru Sueoka Hiroyuki tsutsumi Takahiro Tagami Japan Atomic Energy Agency 2-1 Shiraki Tsuruga Fukui 919-1279 Japan Department of Geophysics Division of Earth and Planetary Sciences Kyoto University Oiwake-cho Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan Department of Geology and Mineralogy Division of Earth and Planetary Sciences Kyoto University Oiwake-cho Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan

Low-temperature thermochronology is a widely used tool for revealing denudation histories of mountain ranges. Although this technique has been applied mainly to continental orogens, such as the European Alps, Himalayas, and Andes, recent technological development of low-temperature thermochronology has made it applicable to a wider variety of mountain ranges with various sizes and tectonic histories. The Japanese Islands comprise young and active island arcs, where an early stage of mountain range formation is observed. Numerous attempts have been made to constrain the uplift and denudation histories of the mountains in the Japanese Islands using geologic, geomorphologic, or geodetic methods. However, the number of thermochronometric attempts has been limited primarily due to the small amount of total denudation since the initiation of the uplift. In this review paper, we introduce the tectonic and geomorphic settings of the mountain ranges in the Japanese Islands, and discuss previous attempts to estimate uplift or denudation of the Japanese mountains using methods other than ther- mochronology. Furthermore, we discuss problems of the thermochronometric applications in revealing denudation histories of the Japanese mountains. Finally, we present a case study of the Kiso Range in central Japan and discuss the current effectiveness and applicability of low-temperature thermochronology to the Japanese mountainous areas.

关键词： Low-temperature thermochronology Denudation Japanese Islands Fault-block mountain T-d relationships

Fractionation of gamma-glutamyltransferase in patients with nonalcoholic fatty liver disease and alcoholic liver disease

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World Journal of Hepatology 2016年第36期8卷 1610-1616页

作者： Shigeo Sueyoshi Setsu Sawai Mamoru Satoh Masanori Seimiya Kazuyuki Sogawa atsushi Fukumura Mikihiro tsutsumi Fumio Nomura Department of Molecular Diagnosis Graduate School of Medicine Chiba University Clinical Proteomics Research Center Chiba University Hospital Department of Hepatology Kanazawa Medical University

AIM To assess how serum gamma-glutamyltransferase(GGT) fractions vary in patients with alcoholic liver disease(ALD) and non-alcoholic fatty liver disease(NAFLD). METHODS Serum samples were obtained from 14 patients with biopsy-proven alcoholic liver diseases and 9 patients with biopsy proven non-alcoholic fatty liver disease. In addition to these biopsy-proven cases, 16 obese(body mass index > 25) patients without any history of alcohol consumption but with a fatty liver on ultrasound examination and with elevated GGT were included for an additional analysis. Serum GGT fractionation was conducted by high-performance gel filtration liquid chromatography and was separated into the four fractions, big-GGT, medium-GGT, small-GGT(s-GGT), and free-GGT(f-GGT).RESULTS The results were expressed as a ratio of each fraction including the total GGT(t-GGT). The s-GGT/t-GGT ratioswere lowest for the control group and highest for the ALD group. The differences between the control and NAFLD groups and also between the NAFLD and ALD groups were statistically significant. In contrast, the f-GGT/t-GGT ratios were highest in the control group and lowest in the ALD group, with the differences being statistically significant. As a result, the s-GGT/f-GGT ratios were markedly increased in the NAFLD group as compared with the control group. The increase of the s-GGT/t-GGT ratios, the decrease of the f-GGT/t-GGT ratios, and the increase of s-GGT/F-GGT ratios as compared with the control group subjects were also found in obese patients with clinically diagnosed fatty change of the *** Serum GGT fractionation by high-performance gel filtration liquid chromatography is potentially useful for the differential diagnosis of ALD and NAFLD.

关键词： Gamma-glutamyltransferase f-GGT/t-GGT ratios Alcoholic liver disease Non-alcoholic fatty liver disease Gel filtration liquid chromatography

-449 C>G polymorphism of NFKB1 gene,coding nuclear factor-kappa-B,is associated with the susceptibility to ulcerative colitis

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World Journal of Gastroenterology 2012年第47期18卷 6981-6986页

作者： Ranji Hayashi Tomomitsu Tahara Tsukasa Yamaaki Takashi Saito Kazuhiro Matsunaga Nobuhiko Hayashi atsushi Fukumura Kazuaki Ozaki Masakatsu Nakamura Hisakazu Shiroeda Mikihiro tsutsumi Tomoyuki Shibata Tomiyasu Arisawa Department of Gastroenterology Kanazawa Medical UniversityIshikawa 920-0293Japan Department of Gastroenterology Fujita Health University1-98 Dengakugakubo Katsukake-ChoToyoakeAichi 470-1192Japan

AIM:To clarify the association between a polymorphism-449 C>G(rs72696119) in 5'-UTR of NFKB1 with ulcerative colitis(UC).METHODS:The studied population comprised 639 subjects,including patients with UC(UC cases,n = 174) and subjects without UC(controls,n = 465).We employed polymerase chain reaction-single strand conformation polymorphism to detect the gene ***:The rs72696119 G allele frequencies in controls and UC cases were 33.4% and 38.5%,respectively(P = 0.10).Genotype frequency of the GG homozygote in UC cases was significantly higher than that in controls(P = 0.017),and the GG homozygote was significantly associated with susceptibility to UC [odds ratio(OR),1.88;95%CI,1.13-3.14].In male subjects,the GG homozygote was associated with an increased risk for UC(OR,3.10;95%CI,1.47-6.54;P = 0.0053),whereas this association was not found in female *** addition,the GG homozygote was significantly associated with the risk of non-continuous disease(OR,2.06;95%CI,1.12-3.79;P = 0.029),not having total colitis(OR,2.40;95%CI,1.09-3.80,P = 0.040),disease which developed before 20 years of age(OR,2.80;95%CI,1.07-7.32,P = 0.041),no hospitalization(OR,2.28;95%CI,1.29-4.05;P = 0.0090) and with a maximum of 8 or less on the UCDAI score(OR,2.45;95%CI,1.23-4.93;P = 0.022).CONCLUSION:Our results provide evidence that NFKB1 polymorphism rs72696119 was significantly associated with the development of *** polymorphism influences the susceptibility to and pathophysiological features of UC.

关键词： Genetic polymorphism NFKB1 Ulcerativecolitis

Clinical differences between alcoholic liver disease and nonalcoholic fatty liver disease

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World Journal of Gastroenterology 2014年第26期20卷 8393-8406页

作者： Nobuyuki Toshikuni Mikihiro tsutsumi Tomiyasu Arisawa Department of Gastroenterology Kanazawa Medical University Department of Hepatology Kanazawa Medical University

Alcoholic liver disease(ALD)and nonalcoholic fatty liver disease(NAFLD)are serious health problems *** two diseases have similar pathological spectra,ranging from simple hepatic steatosis to steatohepatitis,liver cirrhosis,and hepatocellular *** most subjects with excessive alcohol or food intake experience simple hepatic steatosis,a small percentage of individuals will develop progressive liver ***,both ALD and NAFLD are frequently accompanied by extrahepatic complications,including cardiovascular disease and *** survival of patients with ALD and NAFLD depends on various disease-associated *** review delineates the clinical characteristics and outcomes of patients with ALD and NAFLD by comparing their epidemiology,the factors associated with disease susceptibility and progression,and the predictors and characteristics of outcomes.A comprehensive understanding of the characteristics and outcomes of ALD and NAFLD is imperative in the management of these chronic liver diseases.

关键词： Alcoholic liver disease Nonalcoholic fatty liver disease Clinical characteristics Outcomes Chronic liver disease

Petrology,geochemistry,and zircon U-Pb geochronology of the Zambezi Belt in Zimbabwe:Implications for terrane assembly in southern Africa

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Geoscience Frontiers 2019年第6期10卷 2021-2044页

作者： Yusuke Kuribara Toshiaki Tsunogae Yusuke Takamura Yukiyasu tsutsumi Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The Zambezi Belt in southern Africa has been regarded as a part of the 570-530 Ma Kuunga Orogen formed by a series of collision of Archean cratons and Proterozoic orogenic ***,we report new petrological,geochemical,and zircon U-Pb geochronological data of various metamorphic rocks(felsic to mafic orthogneiss,pelitic schist,and felsic paragneiss)from the Zambezi Belt in northeastern Zimbabwe,and evaluate the timing and P-T conditions of the collisional event as well as protolith *** data of felsic orthogneiss indicate within-plate granite signature,whereas those of mafic orthogneiss suggest MORB,ocean-island,or within-plate *** P-Testimates for orthogneisses indicate significant P-T variation within the study area(700-780 C/6.7-7.2 kbar to 800-875 C/10-11 kbar)suggesting that the Zambezi Belt might correspond to a suture zone with several discrete crustal *** cores from felsic orthogneisses yielded two magmatic ages:2655±21 Ma and 813士5 Ma,which suggests Neoarchean and Early Neoproterozoic crustal growth related to within-plate *** zircons from metasediments display various ages from Neoarchean to Neoproterozoic(ca.2700-750 Ma).The Neoarchean(ca.2700-2630 Ma)and Paleoproterozoic(ca.2200-1700 Ma)zircons could have been derived from the adjacent Kalahari Craton and the Magondi Belt in Zimbabwe,*** Choma-Kalomo Block and the Lufilian Belt in Zambia might be proximal sources of the Meso-to Neoproterozoic(ca.1500-950 Ma)and early Neoproterozoic(ca.900-750 Ma)detrital zircons,*** detrital zircons from adjacent terranes possibly deposited during late Neoproterozoic(744-670 Ma),and subsequently underwent highgrade metamorphism at 557-555 Ma possibly related to the collision of the Congo and Kalahari Cratons during the latest Neoproterozoic to *** contrast,670-627 Ma metamorphic ages obtained from metasediments are slightly older than previous reports,but consistent with^68

关键词： Geothermobarometry Detrital zircon Neoproterozoic Congo Craton Kalahari Craton Gondwana