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钙化能否预测甲状腺乳头状癌病人接受131I治疗后淋巴结转移灶131I的浓聚?CT、131I全身扫描和18F-FDG PET/CT比较

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国际医学放射学杂志 2010年第2期 203-203页

作者： K.Kaneko K.Abe s.baba Y.Tanabe H.Yabuuchi M.Hatakenaka 袁瑛 Department of Clinical Radiology Graduate School of Medical SciencesKyushu UniversityFukuokaJapan

研究目的是阐明淋巴结钙化对甲状腺乳头状癌(PTC)病人131I治疗的预测价值。分析了19例PTC病人131I治疗期时CT上淋巴结钙化情况,并与131I全身核素扫描和

关键词：甲状腺乳头状癌淋巴结淋巴组织 FDG PET 病人

高分化甲状腺癌放射碘治疗后(131)~I核素显像联合sPECT/CT的诊断价值

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国际医学放射学杂志 2013年第1期 79-79页

作者： Y.Maruoka K.Abe s.baba T.Isoda H.sawamoto Y.Tanabe 范文骏 Departments of Clinical Radiology Graduate School of Medical SciencesKyushu UniversityMaidashi 3-1-1Higashi-kuFukuoka CityFukuoka 812-8582Japan

目的回顾性比较sPECT/CT和全身131I核素显像联合应用与仅行核素显像对于高分化甲状腺癌放射碘治疗后的新增诊断价值。材料与方法本回顾性研究经单位伦理委员会批准,无需签署知情同意书。研究包括2009年10月—2010年8月经放射碘治疗的高... 详细信息

目的回顾性比较sPECT/CT和全身131I核素显像联合应用与仅行核素显像对于高分化甲状腺癌放射碘治疗后的新增诊断价值。材料与方法本回顾性研究经单位伦理委员会批准,无需签署知情同意书。研究包括2009年10月—2010年8月经放射碘治疗的高分化甲状腺癌病人147例(男53例,女94例,平均年龄51岁)。每例病人均于放射碘治疗的同一天进行全身核素显像和sPECT/CT检查。全身核素显像中的每个放射性浓聚灶,根据甲状腺床内、淋巴结和远隔转移的摄取情况分为阳性和不能确定。采用常规McNemar检验对全身核素显像与sPECT/CT的检查结果进行比较评价。结果 sPECT/CT清晰地确定了甲状腺床内全身核素显像不能确定的全部5个"高摄取"病灶的起源(正常甲状腺残余组织或淋巴结转移)。对于核素显像诊断为转移淋巴结的108个放射性浓聚灶,其中的24个(22.2%)sPECT/CT改变了原来的结论(PsPECT/CT检查中,85个全身核素显像阳性的病灶中有1个证实为阴性(假阳性);在20个全身核素显像不能确定的病灶中,13个证实为阳性,7个证实为阴性。sPECT/CT检查还纠正了3个核素显像为假阴性的病灶。对于远隔转移灶,52个病灶中有24个(40%)的诊断结论被sPECT/CT修正(PsPECT/CT检查中,32个全身核素显像诊断为阳性的病灶中有1个被证实为阴性;20个全身核素显像不能确定的病灶中,11个证实为阳性,9个证实为阴性。对于全部147例病人,通过sPECT/CT检查改变了9例(6.1%)病人的临床分期和3例(2.0%)病人的治疗方案。结论与全身核素显像相比,sPECT/CT提高了131I在淋巴结转移和远隔转移内浓聚的发现和定位准确性。

关键词：放射碘全身病灶核素显像 sPECT/CT 甲状腺癌诊断价值高分化治疗后

THE M/PH/1 QUEUE WITH WORKING VACATIONs AND VACATION INTERRUPTION

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Journal of systems science and systems Engineering 2010年第4期19卷 496-503页

作者： Yutaka baba Faculty of Education and Human sciences Yokohama National University

We study an M/PH/1 queue with phase type working vacation and vacation interruption where the vacation time follows a phase type distribution. The server serves the customers at a lower rate in a vacation period. The server comes back to the regular busy period at a service completion without completing the vacation. such policy is called vacation interruption. In terms of quasi birth and death process and matrix-geometric solution method, we obtain the stationary queue length distribution. Moreover we obtain the conditional stochastic decomposition structures of queue length and waiting time when the service time distribution in the regular busy period is exponential.

关键词： Working vacation vacation interruption phase type distribution quasi birth and death process matrix-geometric solution stochastic decomposition

Comparative analysis of the dissolution kinetics of galena in binary solutions of HCl/FeCl_3 and HCl/H_2O_2

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 9-17页

作者： Alafara A.baba Folahan A.Adekola Department of Chemistry University of Ilorin

A comparative study of the dissolution kinetics of galena ore in binary solutions of FeCl3/HCl and H2O2/HCl has been *** dissolution kinetics of the galena was found to depend on leachant concentration,reaction temperature,stirring speed,solid-to-liquid ratio,and particle *** dissolution rate of galena ore increases with the increase of leachant concentration,reaction temperature,and stirring speed,while it decreases with the increase of solid-to-liquid ratio and particle *** activation energy （Ea） of 26.5 kJ/mol was obtained for galena ore dissolution in 0.3 M FeCl3 /8.06 M HCl,and it suggests the surface diffusion model for the leaching reaction,while the Ea value of 40.6 kJ/mol was obtained for its dissolution in 8.06 M H2O2 /8.06 M HCl,which suggests the surface chemical reaction model for the leaching ***,the linear relationship between rate constants and the reciprocal of particle radius supports the fact that dissolution is controlled by the surface reaction in the two ***,the rate of reaction based on the reaction-controlled process has been described by a semiempirical mathematical *** Arrhenius and reaction constants of 11.023 s^-1,1.25×10^-4 and 3.65×10^2 s^-1,8.02×10^ 6 were calculated for the 0.3 M FeCl3/8.06 M HCl and 8.06 M H2O2/8.06 M HCl binary solutions,respectively.

关键词： galena hydrochloric acid chloride compounds hydrogen peroxide dissolution leaching

Awareness as the Most Effective Measure to Mitigate the spread of COVID-19 in Nigeria

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Computers, Materials & Continua 2020年第12期65卷 1945-1957页

作者： Isa Abdullahi baba Dumitru Baleanu Department of Mathematical sciences Bayero UniversityKanoNigeria Department of Mathematics Cankaya UniversityAnkaraTurkey Institute of space sciences BucharestRomania

A mathematical model consisting of a system of four nonlinear ordinary differential equations is *** aim is to study the dynamics of the spread of COVID-19 in Nigeria and to show the effectiveness of awareness and the need for relevant authorities to engage themselves more in enlightening people on the significance of the available control measures in mitigating the spread of the *** equilibrium solutions;Disease free equilibrium and Endemic equilibrium solutions were calculated and their global stability analysis was carried *** reproduction ratio(R0)was also obtained,in this research𝑅𝑅0=*** obtained for Nigeria is used to conduct numerical simulations in order to support the analytic result and to show the significance of awareness in controlling the disease *** the simulation result,it was shown that to mitigate the spread of COVID-19 in Nigeria there is need for serious awareness programs to enlighten people on the available control measures;social distancing,self-isolation,use of personal protective equipment(such as face mask,hand globes,overall gown,etc.),regular hand washing using soap or sanitizer,avoiding having contact with person showing the symptoms and reporting any suspected case.

关键词： COVID-19 model equilibrium solution basic reproduction ratio stability analysis numerical simulation Nigeria

Dissolution kinetics of kaolin mineral in acidic media for predicting optimal condition for alum production

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Journal of Central south University 2017年第2期24卷 318-324页

作者： Folahan A.ADEKOLA Alafara A.baba sadisu GIRIGIsU Department of Industrial Chemistry University of Ilorin

The dissolution kinetics and mechanisms of reaction of Batagbon Kaolin in sulphuric and fluosilicic acids were studied. Leaching temperature, acid concentration, particle size, solid-to-liquid ratio, and stirring speed were selected as process parameters. It is observed that the dissolution rate increases with decreasing particle size and solid-to-liquid ratio, and increases with stirring speed, acid concentration, and leaching temperature. The experimental results indicate that the dissolution rate is of mixed control via hydrogen ion [H＋] action, with reaction order of 0.813 and the reaction kinetics can be expressed as gmt=[1-（1-x）l/3＋y/6[（l-x）l/3＋ 1-2（1-x）2/3]. The activation energy of the process is determined to be 21.6 k J/mol. The level of the product quality is also evaluated.

关键词： kaolin alum sulphuric and fluosilicic acid leaching kinetic model mixed control

selective extraction of In(Ⅲ),Ga(Ⅲ) and Zn(Ⅱ) using a novel extractant with phenylphosphinic acid

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Chinese Journal of Chemical Engineering 2016年第2期24卷 232-236页

作者： Yuji sasaki Naoki Matsuo Tatsuya Oshima Yoshinari baba Department of Applied Chemistry Faculty of EngineeringUniversity of Miyazaki

A new extractant, [N,N-di（2-ethylhexyl）aminolmethylphenylphosphinic acid （DEAPP）, was synthesized to de- velop the mutual separation techniques of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ）. The extraction selectivity for In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2EHPA and PC-88A. The extraction selectivity for metal ions in 1 mob L 1 aqueous ammonium nitrate solution with DEAPP was in the following order： In（Ⅲ）〉 Ga（Ⅲ）〉 Zn（Ⅱ）. These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of ln（Ⅲ）, Ga（Ⅲ） and Zn（ll）. The extraction equilibria of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP （ = HR） were expressed by the following reactions： In3＋＋ 2（HR）2 InR3（HR）＋ 3H＋, Ga3＋＋ 1.5（HR）2 ＋ N- = GaR2（HR）（NO3）＋ 2H＋, and Zn2＋ 4- 2（HR）2 ZnR2 （HR） 2 determined 4- 2H＋. The extraction equilibrium constants of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP were to be Kex, M = 1.7 × 104 [*** 1], 4.17 [（***-1）s], and 1.55 × 10 2 [-], respectively.

关键词： Liquid-liquid extraction Phosphinic acid Indium(Ⅲ) Gallium(Ⅲ) Zinc(Ⅱ) Mutual separation Extraction equilibrium

Experiment and simulation of turbulent flow in local scour around a spur dyke

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International Journal of sediment Research 2009年第1期24卷 33-45页

作者： Hajime NAKAGAWA Kenji KAWAIKE Yasuyuki baba Disaster Prevention Research Institute Kyoto University

The turbulent flow in the local scour hole around a single non-submerged spur dyke is investigated with both experimental and numerical methods. The experiments are conducted under clear-water scour regime with an impermeable spur dyke. The scour geometry and flow velocities are measured in details with a high-resolution laser displacement meter,electro-magnetic velocimetries and PIV(Particle image velocimetry). A 3D non-linear k-ε model is developed to simulate the complex local flow field around the scour area. The numerical model is formulated using FVM(Finite volume method) on a collocated unstructured mesh,capable of resolving complex geometries and boundaries. It is found that the simulation results are reasonably consistent with those of the experimental measurements. Based on the study results,the nature of the flow structure around a spur dyke with local scour hole is analyzed.

关键词： spur dyke Local scour 3D flow Non-linear k-ε model Unstructured mesh

synchrotron radiation studies of the orientation of thin silicon phthalocyanine dichloride film on HOPG substrate

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Chinese Physics C 2008年第9期32卷 769-772页

作者：邓居智陈荣 sEKIGUCHI Tetsuhiro baba Yuji HIRAO Norie HONDA Mitsunori Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology) Ministry of Education synchrotron Radiation Research Center Japan Atomic Energy Agency

Thin silicon phthalocyanine dichloride films on HOPG were prepared and the sample was heated in the vacuum with laser. The thickness of the thin sample on HOPG was checked by X-ray photoemission spectroscopy. The orientation of the molecules in respect to the substrate plane was investigated by measuring the silicon K-edge near edge X-ray absorption fine structure （NEXAFs）. In the NEXAFs spectra of the thin sample, two clear peaks which were assigned to Is → σ^＊si-N and 1s→ σ^＊si-Cl appeared around 1847.2 eV and 1843.1 eV respectively. The intensities of the resonance peaks showed strong polarization dependence. A quantitative analysis of the polarization dependence revealed that the si-N bond tended to lie down while the si-Cl bond was out of the molecular plane.

关键词： near edge X-ray absorption fine structure (NEXAFs) orientation silicon phthalocyanine dichloride polarization dependence