检索结果-南通市图书馆

Water Saturation Dependence on CO2Sorption Potential of Sandstones

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Resources 2012年第2期3卷 48-55页

作者： Takashi Fujii Kaori Endo satomi nakagawa Yoshiyuki Sato Hiroshi Inomata Shinsuke Nakao Toshiyuki Hashida Fracture and Reliability Research Institute Tohoku University Sendai Japan Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan Research Center of Supercritical Fluid Technology Tohoku University Sendai Japan Research Center of Supercritical Fluid Technology Tohoku University Sendai Japan.

For the assessment of the carbon dioxide (CO2) storage potential of water-filled reservoir rocks (i.e., saline aquifers), it should be first important step for a thorough understanding of the effect of water content on CO2/water/rock interactions during CO2 injection. The purpose of this study is to examine the CO2 sorption amount for Kimachi sandstone and Berea sandstone at different water content using the manometric method at temperature of 50?C and pressures of up to 20 MPa. Our results document that a significant quantity of CO2 was sorbed on the two types of sandstone on all water-saturated bases, which corresponded to the amount adsorbed on the air-dry basis. Also, all the wet samples had significantly higher sorption capacity than the theoretical values calculated from the solubility model based on dissolution of CO2 in pore water and the pore-filling model, which assumes that the pore volume unoccupied by water is filled with CO2. Furthermore, the observations indicated a certain degree of correlation between the sorbed amount and the water content, except at pressures below the critical point for Berea sandstone. This investigation points out that CO2 sorption is a possible mechanism in CO2 geological storage even under water-saturated conditions and that the mechanism of sorption on silica and silicate minerals plays an essential role in the reliable and accurate estimation of the CO2 storage capacity of water-saturated reservoirs.

关键词： CO2 Water Saturation Sorption Potential Sandstones

A weeding-duration model for Abies sachalinensis plantations in Hok-kaido, northern Japan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2013年第1期24卷 131-136页

作者： Masahiko nakagawa Doto Station Forestry Research InstituteHokkaido Research OrganizationShintoku-choHokkaido081-0038Japan

I developed a weeding-duration model for Sakhalin fir （Abies sachalinensis （Fr. Schmidt） Masters） plantations that employs a generalized linear model. The number of years following planting that weeding is necessary is the response variable, and elevation, slope steepness, maximum snow depth, annual precipitation, geology, soil, site index, slope aspect, and vegetation type are explanatory variables. Among the explanatory variables, geology, soil, slope aspect, and vegetation type are categorical data. A Poisson distribution is assumed for the response variable, with a log-link function. Elevation, slope steepness, maximum snow depth, annual precipitation, site index, and vegetation type had a significant effect on weeding duration. Among the eight models with the smallest Akaike information criterion （AIC）, I chose the model with no multicollinearity among the explanatory variables. The weeding-duration model includes site index, maximum snow depth, slope steepness （angle） and vegetation type as explanatory variables; elevation and annual precipitation were not included in the selected model because of multicollinearity with maximum snow depth. This model is useful for cost-benefit analyses of afforestation or reforestation with Abies sachalinensis.

关键词： Abies sachalinensis plantation snow depth site index weeding

On the Numerical Modeling of the Deep Mantle Water Cycle in Global-Scale Mantle Dynamics:The Effects of the Water Solubility Limit of Lower Mantle Minerals

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2017年第4期28卷 563-577页

作者： Takashi nakagawa Department of Mathematical Science and Advanced Technology Japan Agency for Marine-Earth Science and TechnologyYokohama 236-0001Japan

Water is the most important component in Earth system evolution. Here, I review the current understanding of the fate of water in the mantle dynamics system based on high-pressure and temperature experiments, geochemical analyses, seismological and geomagnetic observations, and nu- merical modeling of both regional- and giobal-scale mantle dynamics. In addition, as a numerical ex- ample, I show that the water solubility of the deep mantle is strongly sensitive to global-scale water cir- culation in the mantle. In a numerical example shown here, water solubility maps as functions of tem- perature and pressure are extremely important for revealing the hydrous structures in both the mantle transition zone and the deep mantle. Particularly, the water solubility limit of lower mantle minerals should be not so large as ~100 ppm for the mantle transition zone to get the largest hydrous reservoir in the giobal-scale mantle dynamics system. This result is consistent with the current view of mantle water circulation provided by mineral physics, which is also found as a hydrous basaltic crust in the deep mantle and the water enhancement of the mantle transition zone simultaneously. In this paper, I also discuss some unresolved issues associated with mantle water circulation, its influence on the onset and stability of plate motion, and the requirements for developing Earth system evolution in mantle dy- namics simulations.

关键词： numerical modeling mantle convection water cycle water solubility limit.

Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第6期13卷 981-982页

作者： Hiroshi nakagawa Masahiko Takada Sobell Department of Motor Neuroscience and Movement Disorders Institute of Neurology University College London Systems Neuroscience Section Primate Research Institute Kyoto University

Spinal cord injury（SCI）leads to permanent disability with motor and sensory *** mature mammalian central nervous system（CNS）possesses a limited capacity to regenerate/regrow after injury.

关键词： Promoting functional recovery by inhibition of repulsive guidance molecule-a after spinal cord injury SCI

Efficacy and safety of endoscopic submucosal dissection for gastric tube cancer:A multicenter retrospective study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第11期27卷 1043-1054页

作者： Takuya satomi Seiji Kawano Tomoki Inaba Masahiro nakagawa Hirokazu Mouri Masao Yoshioka Shoichi Tanaka Tatsuya Toyokawa Sayo Kobayashi Takehiro Tanaka Hiromitsu Kanzaki Masaya Iwamuro Yoshiro Kawahara Hiroyuki OkadaDepartment of Gastroenterology and Hepatology Department of Gastroenterology and Hepatology Okayama University Graduate School of MedicineDentistryand Pharmaceutical SciencesOkayama 700-8558OkayamaJapan Department of Gastroenterology Kagawa Prefectural Central HospitalTakamatsu 760-8557KagawaJapan Department of Endoscopy Hiroshima City Hiroshima Citizens HospitalHiroshima 730-8518HiroshimaJapan Department of Gastroenterology and Hepatology Kurashiki Central HospitalKurashiki 710-8602OkayamaJapan Department of Gastroenterology and Hepatology Okayama Saiseikai General HospitalOkayama 700-8511OkayamaJapan Department of Gastroenterology National Hospital Organization Iwakuni Clinical CenterIwakuni 740-8510YamaguchiJapan Department of Gastroenterology National Hospital Organization Fukuyama Medical CenterFukuyama 720-8521HiroshimaJapan Department of Internal Medicine Fukuyama City HospitalFukuyama 721-8511HiroshimaJapan Department of Pathology Okayama University HospitalOkayama 700-8558OkayamaJapan Department of Practical Gastrointestinal Endoscopy Okayama University Graduate School of MedicineDentistry and Pharmaceutical SciencesOkayama 700-8558OkayamaJapan

BACKGROUND Recent improvements in the prognosis of patients with esophageal cancer have led to the increased occurrence of gastric tube cancer(GTC)in the reconstructed gastric ***,there are few reports on the treatment results of endoscopic submucosal dissection(ESD)for *** To evaluate the efficacy and safety of ESD for GTC after esophagectomy in a multicenter *** We retrospectively investigated 48 GTC lesions in 38 consecutive patients with GTC in the reconstructed gastric tube after esophagectomy who had undergone ESD between January 2005 and December 2019 at 8 institutions participating in the Okayama Gut Study *** clinical indications of ESD for early gastric cancer were similarly applied for GTC after *** specimens were evaluated in 2-mm slices according to the Japanese Classification of Gastric Carcinoma with curability assessments divided into curative and non-curative resection based on the Gastric Cancer Treatment *** characteristics,treatment results,clinical course,and treatment outcomes were *** The median age of patients was 71.5 years(range,57-84years),and there were 34 men and 4 *** median observation period after ESD was 884 d(range,8-4040 d).The median procedure time was 81 min(range,29-334 min),the en bloc resection rate was 91.7%(44/48),and the curative resection rate was 79%(38/48).Complications during ESD were seen in 4%(2/48)of case,and those after ESD were seen in 10%(5/48)of *** survival rate at 5 years was 59.5%.During the observation period after ESD,10 patients died of other *** there were differences in the procedure time between institutions,a multivariate analysis showed that tumor size was the only factor associated with prolonged procedure *** ESD for GTC after esophagectomy was shown to be safe and effective.

关键词： Endoscopic submucosal dissection Gastric tube Gastric cancer Esophagectomy Multicenter study Retrospective study

Taming heterogeneous rhenium catalysis for the production of biomass-derived chemicals

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 Chemical Letters 2020年第5期31卷 1071-1077页

作者： Keiichi Tomishige Yoshinao nakagawa Masazumi Tamura Department of Applied Chemistry School of EngineeringTohoku UniversityMiyagi 980-857Japan

Rhenium is one of important components for heterogeneous catalysts,which has been recently used for the catalytic reactions related to the production of biomass-derived chemicals such as deoxydehydration of vicinal OH groups,C-O hydrogenolysis,and hydrogenation of carboxylic acids,and so *** oxidation state of Re as a catalytic active species is strongly dependent on the catalytic *** control of the oxidation state of Re species on the catalysts is crucial on the catalyst development.

关键词： Rhenium Oxidation state Deoxydehydration Hydrogenolysis Hydrogenation

Prediction of Photosynthetic Carbon Assimilation Rate of Individual Rice Leaves under Changes in Light Environment Using BLSTM-Augmented LSTM

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第12期133卷 557-577页

作者： Masayuki Honda Kenichi Tatsumi Masaki nakagawa Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyKoganei City184-8588Japan Institute of Agriculture Tokyo University of Agriculture and TechnologyFuchu City183-0054Japan Institute of Engineering Tokyo University of Agriculture and TechnologyKoganei City184-8588Japan

A model to predict photosynthetic carbon assimilation rate(A)with high accuracy is important for forecasting crop yield and *** short-term memory(LSTM),a neural network suitable for time-series data,enables prediction with high accuracy but requires mesophyll *** addition,for practical use,it is desirable to have a technique that can predict A from easily available *** this study,we propose a BLSTM augmented LSTM(BALSTM)model,which utilizes bi-directional LSTM(BLSTM)to indirectly reproduce the mesophyll variables required for *** most significant feature of the proposed model is that its hybrid architecture uses only three relatively easy-to-collect external environmental variables—photosynthetic photon flux density(Q_(in)),ambient CO_(2) concentration(C_(a)),and temperature(T_(air))—to generate mesophyll CO_(2) concentration(C_(i))and stomatal conductance to water vapor(g_(sw))as intermediate ***,A is predicted by applying the obtained intermediate outputs to the learning ***,in this study,1)BALSTM(Q_(in),C_(a),T_(air))had a significantly higher A prediction accuracy than LSTM(Q_(in),C_(a),T_(air))in case of using only Q_(in),C_(a),and T_(air);2)BALSTMC_(i),g_(sw),which had C_(i) and g_(sw) as intermediate products,had the highest A prediction accuracy compared with other candidates;and 3)for samples where LSTM(Q_(in),C_(a),T_(air))had poor prediction accuracy,BALSTMC_(i),g_(sw)(Q_(in),C_(a),T_(air))clearly improved the ***,it was found that incorrect predictions may be formed when certain factors are not reflected in the data(e.g.,timing,cultivar,and growth stage)or when the training data distribution that accounts for these factors differs from the predicted data ***,a robust model should be constructed in the future to improve the prediction accuracy of A by conducting gasexchange measurements(including a wide range of external environmental values)and by increasing the

关键词： Hybrid prediction model assimilation rate leaf internal variables recurrent neural network fluctuating light environments rice

Feature-aware regularization for sparse online learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第5期57卷 65-85页

作者： OIWA Hidekazu MATSUSHIMA Shin nakagawa Hiroshi Graduate School of Information Science and Technology The University of Tokyo Information Technology Center The University of Tokyo

Learning a compact predictive model in an online setting has recently gained a great deal of *** combination of online learning with sparsity-inducing regularization enables faster learning with a smaller memory space than the previous learning *** optimization methods and learning algorithms have been developed on the basis of online learning with L1-regularization.L1-regularization tends to truncate some types of parameters,such as those that rarely occur or have a small range of values,unless they are emphasized in ***,the inclusion of a pre-processing step would make it very difficult to preserve the advantages of online *** propose a new regularization framework for sparse online *** focus on regularization terms,and we enhance the state-of-the-art regularization approach by integrating information on all previous subgradients of the loss function into a regularization *** resulting algorithms enable online learning to adjust the intensity of each feature’s truncations without pre-processing and eventually eliminate the bias of *** show theoretical properties of our framework,the computational complexity and upper bound of *** demonstrated that our algorithms outperformed previous methods in many classification tasks.

关键词： online learning supervised learning sparsity-inducing regularization feature selection sentiment analysis

Reductive Conversion of Biomass-Derived Furancarboxylic Acids with Retention of Carboxylic Acid Moiety

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2021年第3期27卷 165-179页

作者： Yoshinao nakagawa Mizuho Yabushita Keiichi Tomishige Department of Applied Chemistry School of EngineeringTohoku University6-6-07 AobaAramakiAoba-kuSendai 980-8579Japan Research Center for Rare Metal and Green Innovation Tohoku University468-1AobaAramakiAoba-kuSendai 980-0845Japan

Catalytic reduction systems of 2-furancarboxylic acid(FCA)and 2,5-furandicarboxylic acid(FDCA)with H 2 without reduction of the carboxyl groups are *** and FDCA are produced from furfural and 5-hydroxymethylfurfural which are important platform chemicals in biomass *** ring hydrogenation to tetrahydrofuran-2-carboxylic acid(THFCA)and tetrahydrofuran-2,5-dicarboxylic acid(THFDCA)easily proceeds over Pd *** of one C–O bond in the furan ring produces 5-hydroxyvaleric acid(5-HVA)and 2-hydroxyadipic acid.2-Hydroxyvaleric acid is not produced in the reported systems.5-HVA can be produced as the lactone form(δ-valerolactone;DVL)or as the esters depending on the *** reactions proceed over Pt catalysts with good yields(~70%)at optimized *** of two C–O bonds in the furan ring produces valeric acid and adipic acid,the latter of which is a very important chemical in industry and its production from biomass is of high *** acid from FDCA can be produced directly over Pt-MoO_(x) catalyst,indirectly via hydrogenation and hydrodeoxygenation as one-pot reaction using the combination of Pt and acid catalysts such as Pt/niobium oxide,or indirectly via two-step reaction composed of hydrogenation catalyzed by Pd and hydrodeoxygenation catalyzed by iodide ion in acidic *** the two-step method can give good yield of adipic acid at present.

关键词： Biomass Hydrogenolysis Furanic compound Carboxylic acid