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American Journal of Analytical Chemistry 2014年第7期5卷 433-444页

作者： Yoshihiro Kudo Marina Ogihara Shoichi Katsuta yasuyuki takeda Graduate School of Science Chiba University Chiba Japan

Two extraction constants (Kex± and Kex) for extraction of silver picrate (Ag﹢Pic﹣) by benzo-15-crown-5 ether (B15C5) and benzo-18-crown-6 one (B18C6) into 1,2-dichloroethane (DCE) and dichloromethane (DCM) were determined at 298 K and given values of ionic strength. Here, Kex± and Kex were expressed as [AgL﹢]o[Pic﹣]o/[Ag﹢][L]o[Pic﹣] and [AgLPic]o/[Ag﹢][L]o[Pic﹣], respectively: L symbolizes B15C5 or B18C6 and the subscript “o” denotes the organic phase composed of DCE or DCM. Individual distribution constants (KD,Pic) of picrate ion, Pic﹣, into the two diluents were also determined with the determination of Kex. From comparison of these KD,Pic values with those standardized, interfacial potential differences () at extraction equilibria were evaluated. Then, using these values, relations of the experimentally-determined logKex± or logKex values with their electrochemically-standardized ones were precisely discussed. Consequently, it was indicated that logKex± should be expressed as a function of .

关键词： Individual Distribution Constants Interfacial Potential Differences Standardized Extraction Constants Silver Picrate Benzo Crown Ethers Dihaloalkanes

Simple procedure for assessing diffuse subarachnoid hemorrhage successfully created using filament perforation method in mice

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Animal Models and Experimental Medicine 2024年第1期7卷 77-81页

作者： Tatsushi Mutoh Ryota Tochinai Hiroaki Aono Masayoshi Kuwahara yasuyuki Taki Tatsuya Ishikawa Department of Surgical Neurology Research Institute for Brain and Blood VesselsAkita Cerebrospinal and Cardiovascular CenterAkitaJapan Department of Aging Research and Geriatric Medicine Institute of DevelopmentAging and CancerTohoku UniversitySendaiJapan Department of Veterinary Pathophysiology and Animal Health Graduate School of Agriculture and Life SciencesThe University of TokyoTokyoJapan

The murine model of subarachnoid hemorrhage(SAH)is a valuable experimental tool for investigating molecular and cellular mechanisms,and the endovascular filament perforation technique can be used to simulate prominent pathophysiological features observed after human SAH;however,current validation methods for assessing an appropriate SAH model are ***,we introduce a simple procedure for se-lecting a mouse model of diffuse *** was induced in 24 mice using a standard filament perforation *** confirming survival at 24 h,SAH was scored 0-1 based on T2*-weighted images on whole-brain magnetic resonance imaging(MRI)and visual surveillance of the cisterna magna(CM)through the dura *** CM-based SAH grading correlated well with a reference parameter defined by extracted brain(r^(2)=0.53,p<0.0001).The receiver operating characteristic curve revealed a sensi-tivity of 85%and a specificity of 91%for detecting diffuse SAH,with a similar area under the curve(0.89±0.06[standard error of the mean])as the MRI-based grading(0.72±0.10,p=0.12).Our data suggest that confirming an SAH clot in the CM is a valuable way to select a clinically relevant diffuse SAH model that can be used in future experimental studies.

关键词： cisterna magna clot distribution filament perforation mouse model subarachnoid hemorrhage

Elucidation of Abnormal Potential Responses of Cation-Selective Electrodes with Solid-State Membranes to Aqueous Solutions of CuCl2 and CdI2

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American Journal of Analytical Chemistry 2011年第1期2卷 9-17页

作者： Yoshihiro Kudo Daisuke Todoroki Nobukazu Suzuki Naoki Horiuchi Shoichi Katsuta yasuyuki takeda 不详

An empirical solution to abnormal potential responses, showing peaks of emf, of commercial Cu2+- and Cd2+-selective electrodes with solid-state membranes was proposed for aqueous solutions of CuCl2 and CdI2. The two-step processes of Mn+ + Yn? (s: solid phase) MY(s) and MY(s) + 2X? X2MY2?(s) (n = 1, 2) at a test solution/electrode-interface were considered as a model. Here, Mn+, Yn?, and X? refer to a divalent or univalent cation, functional groups of electrode materials, and a halide ion (X? = Cl?, Br?, I?), respectively. By applying electrochemical potentials to these processes at n = 2, we derived an equation. Regression analyses based on the equation reproduced well the plots of emf versus log 2(*[M]t) for the Cd(II) and Cu(II) systems: *[M]t denotes a total concentration of species relevant to M2+ in a bulk of the aqueous solution. Also, we obtained log Ks(CdBr2) = 4.28 ? 0.22, log Ks(CdI2) = 6.98 ? 0.05, log Ks(CuCl2) = 3.96 ? 0.09, and log Ks(CuBr2) = 11.4 at 25?C. The magnitude in ?log Ks reflected that in the logarithmic solubility product, log {*[M2+](*[X?])2}, for bulk water, where *[M2+] or *[X?] denotes a molar concentration of the bulk solu-tion of M2+ or X? at equilibrium, respectively. Moreover, a mixture of CuSO4 with NaCl at the molar ratio of 1:1 yielded a plot similar to that of CuCl2.

关键词： Cation-Selective Electrode Solid-State Membranes Potential Response Solubility Product Potentiometry

Investigation of HO_(2) uptake mechanisms onto multiple-component ambient aerosols collected in summer and winter time in Yokohama,Japan

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Journal of Environmental Sciences 2024年第3期137卷 18-29页

作者： Jun Zhou Yukiko Fukusaki Kentaro Murano Tania Gautam Yu Bai Yoshimi Inomata Hiroaki Komatsu Mayuko takeda Bin Yuan Min Shao Yosuke Sakamoto Yoshizumi Kajii Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation forEnvironmental Quality Guangzhou 511443China Graduate School of Global Environmental Studies Kyoto UniversityKyoto606-8501Japan Yokohama Environmental Science Research Institute Yokohama Kanagawa 221–0024Japan Department of Chemistry University of AlbertaAlbertaEdmonton T6G 2G2Canada Graduate School of Human and Environmental Studies Kyoto UniversityKyoto 606-8501Japan Kanagawa Environmental Research Center Kanagawa 254-0014Japan Center for Regional Environmental Research National Institute for Environmental StudiesIbaraki305-8506Japan

The heterogeneous loss of HO_(2)radicals onto ambient aerosols plays an important role in tropospheric ***,sparse investigation of the dominating parameters controlling the HO_(2)uptake coefficients onto ambient aerosols(γHO_(2))has largely hindered the application of the measuredγHO_(2)to the global spatial *** we induced an offine method using LFP-LIF technique to measure the kinetics of HO_(2)uptake onto ambient aerosols collected in summertime and wintertime in Yokohama city,a regional urban site near Tokyo,*** controlling the dominating parameters which infuenceγHO_(2),we were able to investigate the detailed HO_(2)uptake *** characterized the chemical composition of the collected ambient aerosols,including organics,inorganics,transition metals ions,*** modeledγHO_(2)using different *** show thatγHO_(2)increased with the increase in RH,and the aerosol states(“dry”or wet/aqueous)have large effects onγHO_(2).With fixed RH and aerosol chemical composition,γHO_(2)was highly dependent on pH and inversely correlated with[HO_(2)]_*** combing the measuredγHO_(2)values with the modeled ones,we found that both the HO_(2)self-reaction and transition metal-catalyzed reactions should be accounted for to yield a single parameterization to predictγHO_(2),and different chemical compositions may have collective effects onγHO_(2).Results may serve for extending theγHO_(2)values measured at one observation site to different environmental conditions,which will help us to achieve more accurate modeling results concerning secondary pollutant formation(i.e.,ozone).

关键词： HO_(2)uptake kinetics Offine method Impacting factors Mechanism

Initial decrease in the lipoprotein(a)level is a novel prognostic biomarker in patients with acute coronary syndrome

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World Journal of Cardiology 2024年第6期16卷 329-338页

作者： Yasuhiko Saeki Jun Sawaguchi Satori Akita Taka-aki Takamura Kosuke Fujibayashi Minoru Wakasa Hironobu Akao Michihiko Kitayama yasuyuki Kawai Kouji Kajinami Department of Cardiology Kanazawa Medical UniversityUchinada 9200293Japan Trans-catheter Cardiovascular Therapeutics Kanazawa Medical UniversityUchinada 9200293Japan

BACKGROUND Lipoprotein(a)[Lp(a)]is a causal risk factor for atherosclerotic cardiovascular diseases;however,its role in acute coronary syndrome(ACS)remains *** To investigate the hypothesis that the Lp(a)levels are altered by various conditions during the acute phase of ACS,resulting in subsequent cardiovascular *** From September 2009 to May 2016,377 patients with ACS who underwent emergent coronary angiography,and 249 who completed≥1000 d of follow-up were ***(a)levels were measured using an isoform-independent assay at each time point from before percutaneous coronary intervention(PCI)to 48 h after *** primary endpoint was the occurrence of major adverse cardiac events(MACE;cardiac death,other vascular death,ACS,and non-cardiac vascular events).RESULTS The mean circulating Lp(a)level decreased significantly from pre-PCI(0 h)to 12 h after(19.0 mg/dL to 17.8 mg/dL,P<0.001),and then increased significantly up to 48 h after(19.3 mg/dL,P<0.001).The changes from 0 to 12 h[Lp(a)Δ0-12]significantly correlated with the basal levels of creatinine[Spearman’s rank correlation coefficient(SRCC):-0.181,P<0.01]and Lp(a)(SRCC:-0.306,P<0.05).Among the tertiles classified according to Lp(a)Δ0-12,MACE was significantly more frequent in the lowest Lp(a)Δ0-12 group than in the remaining two tertile groups(66.2%vs 53.6%,P=0.034).A multivariate analysis revealed that Lp(a)Δ0-12[hazard ratio(HR):0.96,95%confidence interval(95%CI):0.92-0.99]and basal creatinine(HR:1.13,95%CI:1.05-1.22)were independent determinants of subsequent *** Circulating Lp(a)levels in patients with ACS decreased significantly after emergent PCI,and a greater decrease was independently associated with a worse prognosis.

关键词： Lipoprotein(a) Acute coronary syndrome Percutaneous coronary intervention Major adverse cardiac events Prognosis

A backpropagation neural network improved by a genetic algorithm for predicting the mean radiant temperature around buildings within the long-term period of the near future

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Building Simulation 2022年第3期15卷 473-492页

作者： Yuquan Xie yasuyuki Ishida Jialong Hu Akashi Mochida Department of Architecture and Building Science Graduate School of EngineeringTohoku UniversityJapan Institute of Technology Tokyu ConstructionJapan

This study aimed to develop a neural network(NN)-based method to predict the long-term mean radiant temperature(MRT)around buildings by using meteorological parameters as training *** MRT dramatically impacts building energy consumption and significantly affects outdoor thermal *** NN-based long-term MRT prediction,two main restrictions must be overcome to achieve precise results:first,the difficulty of preparing numerous training datasets;second,the challenge of developing an accurate NN *** overcome these restrictions,a combination of principal component analysis(PCA)and K-means clustering was employed to reduce the training data while maintaining high prediction ***,three widely used NN models(feedforward NN(FFNN),backpropagation NN(BPNN),and BPNN optimized using a genetic algorithm(GA-BPNN))were compared to identify the NN with the best long-term MRT prediction *** performances of the tested NNs were evaluated using the mean absolute percentage error(MAPE),which was≤3%in each *** findings indicate that the training dataset was reduced effectively by the PCA and *** the three NNs,the GA-BPNN produced the most accurate results,with its MAPE being below 1%.This study will contribute to the development of fast and feasible outdoor thermal environment prediction.

关键词： backpropagation neural network principal component analysis mean radiant temperature K-means clustering genetic algorithm long-term prediction

Effect of dissolved oxygen on methane production from bottom sediment in a eutrophic stratified lake

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Journal of Environmental Sciences 2023年第3期125卷 61-72页

作者： yasuyuki Maruya Keisuke Nakayama Masafumi Sasaki Katsuaki Komai Graduate School of Engineering Kyushu University744 MotookaNishi-KuFukuoka 819-0395Japan Graduate School of Engineering Kobe UniversityRokkodai-Cho 1-1Nada-KuKobe 657-8501Japan Department of Engineering Kitami Institute of TechnologyKohen-Cho 165Kitami 090-8507Japan

Clarifying the role of sulfate and dissolved oxygen (DO) in methane production may allow for precise and accurate modeling of methane emissions in eutrophic *** conducted field observations of sulfate,methane,and DO concentrations in Lake Abashiri,a typical brackish and eutrophic lake in a cold region,to develop a DO-based method for quantitively estimating methane production in a eutrophic lake and analyzed the *** found that sulfate concentrations decreased rapidly from 900.0 mg/L in water overlying the sediments to nearly 0.0 mg/L in the bottom *** production was almost uniform across sediment depths of 0.05 to 0.25 m,ranging from 1400 to 1800μmol/m^(2)/***,methane production was found to be a function of DO concentrations in water overlying the bottom and could be modeled by a logistic function:constant production at 1,400μmol/m^(2)/day for DO concentrations of 0.0 to 3.0 mg/L,rapidly decreasing to 0μmol/m^(2)/day for DO concentrations of 3.0 to 6.0 mg/*** methane model was verified using a simple one-dimensional numerical model that showed good agreement with field *** results thus suggest that the proposed methane model reduces uncertainty in estimating methane production in a eutrophic lake.

关键词： Dissolved oxygen(DO) Stratification Methane Anoxia Numerical simulation

Goblet cell carcinoid of the appendix:Six case reports

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World Journal of Clinical Cases 2024年第22期12卷 5217-5224页

作者： Toshiaki Toshima Ryo Inada Shinya Sakamoto Eri takeda Takahiro Yoshioka Kento Kumon Naoki Mimura Nobuo Takata Motoyasu Tabuchi Kazuyuki Oishi Takuji Sato Kenta Sui Takehiro Okabayashi Kazuhide Ozaki Toshio Nakamura Yuichi Shibuya Manabu Matsumoto Jun Iwata Department of Gastroenterological Surgery Kochi Health Sciences CenterKochi 781-8555Japan Department of Diagnostic Pathology Kochi Health Sciences CenterKochi 781-8555Japan

BACKGROUND Goblet cell carcinoid(GCC)of the appendix is a rare tumor characterized by neuroendocrine and adenocarcinoma *** preoperative diagnosis is very difficult,with most patients complaining mainly of abdominal *** tomography shows swelling of the appendix,so diagnosis is usually made incidentally after appendectomy based on a preoperative diagnosis of *** if a patient undergoes preoperative colonoscopy,accurate endoscopic diagnosis is very difficult because GCC shows a submucosal growth pattern with invasion of the appendiceal *** SUMMARY Between 2017 and 2022,6 patients with GCC were treated in our *** presenting complaint for 5 of these 6 patients was abdominal *** 5 patients underwent appendectomy,including 4 for a preoperative diagnosis of appendicitis and the other for diagnosis and treatment of an appendiceal *** sixth patient presented with vomiting and underwent ileocecal resection for GCC diagnosed from preoperative *** 2 patients with GCC underwent colonoscopy,no neoplastic changes were *** of the six patients showed lymph node metastasis on pathological *** of the last followup(median:15 mo),all cases remained alive without *** As preoperative diagnosis of GCC is difficult,this possibility must be considered during surgical treatments for presumptive appendicitis.

关键词： Goblet cell carcinoid Appendix Preoperative diagnosis Endoscopic diagnosis Surgical treatment Case report

Analysis for Effects of Temperature Rise of PV Modules upon Driving Distance of Vehicle Integrated Photovoltaic Electric Vehicles

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Energy and Power Engineering 2024年第4期16卷 131-150页

作者： Masafumi Yamaguchi yasuyuki Ota Taizo Masuda Christian Thiel Anastasios Tsakalidis Arnulf Jaeger-Waldau Kenji Araki Kensuke Nishioka Tatsuya Takamoto Takashi Nakado Kazumi Yamada Tsutomu Tanimoto Yosuke Tomita Yusuke Zushi Kenichi Okumura Takashi Mabuchi Akinori Satou Kyotaro Nakamura Ryo Ozaki Nobuaki Kojima Yoshio Ohshita Toyota Technological Institute Nagoya Japan Faculty of Engineering Miyazaki University Miyazaki Japan Toyota Motor Corporation Susono Japan European Commission— Joint Research Centre Ispra Italy Sharp Corporation Nara Japan Toyota Motor Corporation Toyota Japan Nissan Motor Corporation Yokosuka Japan

The development of vehicle integrated photovoltaics-powered electric vehicles (VIPV-EV) significantly reduces CO2 emissions from the transport sector to realize a decarbonized society. Although long-distance driving of VIPV-EV without electricity charging is expected in sunny regions, driving distance of VIPV-EV is affected by climate conditions such as solar irradiation and temperature rise of PV modules. In this paper, detailed analytical results for effects of climate conditions such as solar irradiation and temperature rise of PV modules upon driving distance of the VIPV-EV were presented by using test data for Toyota Prius and Nissan Van demonstration cars installed with high-efficiency InGaP/GaAs/InGaAs 3-junction solar cell modules with a module efficiency of more than 30%. The temperature rise of some PV modules studied in this study was shown to be expressed by some coefficients related to solar irradiation, wind speed and radiative cooling. The potential of VIPV-EV to be deployed in 10 major cities was also analyzed. Although sunshine cities such as Phoenix show the high reduction ratio of driving range with 17% due to temperature rise of VIPV modules, populous cities such as Tokyo show low reduction ratio of 9%. It was also shown in this paper that the difference between the driving distance of VIPV-EV driving in the morning and the afternoon is due to PV modules’ radiative cooling. In addition, the importance of heat dissipation of PV modules and the development of high-efficiency PV modules with better temperature coefficients was suggested in order to expand driving range of VIPV-EV. The effects of air-conditioner usage and partial shading in addition to the effects of temperature rise of VIPV modules were suggested as the other power losses of VIPV-EV.

关键词： Vehicle Integrated Photovoltaics (VIPV) VIPV-Powered Electric Vehicles Driving Distance PV Modules Solar Irradiation Temperature Rise Radiative Cooling

Chemical Interpretation on the Multi-Stage Oxidation of Diethyl Ether

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Journal of Thermal Science 2023年第2期32卷 513-520页

作者： SAKAI yasuyuki NAKAMURA Hisashi SUGITA Toru TEZUKA Takuya UYGUN Yasar Department of Mechanical Systems Engineering Ibaraki UniversityIbaraki 316-8511Japan Institute of Fluid Science Tohoku UniversityMiyagi 980-8577Japan Graduate School of Engineering Tohoku UniversityMiyagi 980-8579Japan Mathematics and Logistics Jacobs University BremenBremen 28759Germany

Multi-stage ignition and/or double NTC(negative temperature coefficient)behavior resulted from the low-temperature oxidation of ether compounds are still not clearly *** have investigated the oxidation mechanism of a stoichiometric DEE(diethyl ether)/air mixture by using a micro flow reactor with a controlled temperature profile to see the detail of low-temperature weak flame *** simulation was also performed to understand the chemical kinetics mechanism of observed weak flame *** measurement showed separated weak flame in the temperature range of 600 K-800 *** simulation also qualitatively reproduced this separated weak flame,and showed four peak of heat *** the reaction flow analysis,it was found that(1)O-O bond scission reaction of keto-hydroperoxide produced by DEE,(2)O-O bond scission reaction of CH3O2H,CH3CO3H,and C2H5O2H,(3)O-O bond scission reaction of H2O2,and(4)H+O2=O+OH are key chain branching reactions to explain the multi-stage oxidation.

关键词： diethyl ether micro flow reactor weak flame multi-stage oxidation reaction path