检索结果-南通市图书馆

Dirac operator on the sphere with attached wires

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第4期25卷 335-338页

作者： E N Grishanov D A Eremin D A Ivanov I yu.popov Ogarev Mordovia State University Bolshevistskaya Str. 68 Saransk Russia ITMO University Kroverkskiy pr. 49 St. Petersburg 197101 Russia

An explicitly solvable model for tunnelling of relativistic spinless particles through a sphere is suggested. The model operator is constructed by an operator extensions theory method from the orthogonal sum of the Dirac operators on a semi- axis and on the sphere. The transmission coefficient is obtained. The dependence of the transmission coefficient on the particle energy has a resonant character. One observes pairs of the Breit-Wigner and the Fano resonances. It correlates with the corresponding results for a non-relativistic particle.

关键词： Dirac operator nanostructure tunnelling solvable model

A Model of Irregular Impurity at the Surface of Nanoparticle and Catalytic Activity

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第7期58卷 55-58页

作者： I.V.Blinova V.V.Gusarov I.yu.popov St.Petersburg National Research University of Information Technologies Mechanics and OpticsKronverkskiy49St.Petersburg 197101Russia St.Petersburg State Technological Institute (Technical University) Moskovskiy26St.Petersburg 190013Russia

A problem of nanocatalyst improvement is considered. The existence of irregularities at the surface of nanoparticle leads to the increasing of the surface/volume ratio and, correspondingly, to the improvement of the catalytic activity. But this impurity gives one an additional effect due to the change of the electronic density at the surface. We suggest simple model for the description of this effect. The model allows one to find the discrete spectrum of the Schrdinger operator for nanoparticle. Due to this impurity induced bound states the electron density increases near the surface. It leads to the increase of the catalytic activity of nanoparticles with surface impurities.

关键词： semi-infinite crystal operator spectrum impurity catalytic activity nanoparticle

Heterogeneity of Heterotrophic Bacteria Dominating in Brackish Lake Shira (Republic of Khakasia, Russia) Subjected to Anthropogenic Impact

在线全文

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2010年第5期2卷 389-395页

作者： Tatiana I. Lobova yu.iy V. Barkhatov Olga V. Salamatina ludmila yu. popov. 不详

In this work data on heterogeneity in halotolerance and the resistance to antibiotics of heterotrophic bacteria dominating in Lake Shira (Republic of Khakasia, Russia) were presented. It was established that halotoler-ance of the bacteria is determined by genetic and epigenetic mechanisms. Influence of anthropogenic factor (entering the ecosystem allochthonous bacteria) on the appearance of multiple antibiotic resistance appear-ance by dominating bacterial species is discussed.

关键词： Anthropogenic Impact Antibiotic Resistance Halotolerance Heterotrophic Bacteria Heterogeneity

Regulation of dipeptidyl peptidase 8 and 9 expression in activated lymphocytes and injured liver

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第19期19卷 2883-2893页

作者： Sumaiya Chowdhury Yiqian Chen Tsun-Wen Yao Katerina Ajami Xin M Wang yu.y popov.Detlef Schuppan Patrick Bertolino Geoffrey W McCaughan Denise MT yu.Mark D Gorrell Centenary Institute and Sydney Medical School University of SydneySydneyNSW 2006Australia Division of Gastroenterology and Hepatology Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMA 02215United States Molecular Hepatology Centenary InstituteNewtownSydneyNSW 2042Australia

AIM:To investigate the expression of dipeptidyl peptidase(DPP) 8 and DPP9 in lymphocytes and various models of liver ***:DPP8 and DPP9 expression were measured in mouse splenic CD4 + T-cells,CD8 + T-cells and B-cells(B220 +),human lymphoma cell lines and mouse splenocytes stimulated with pokeweed mitogen(PWM) or lipopolysaccharide(LPS),and in dithiothreitol(DTT) and mitomycin-C treated Raji ***8 and DPP9 expression were measured in epidermal growth factor(EGF) treated Huh7 hepatoma cells,in fibrotic liver samples from mice treated with carbon tetrachloride(CCl 4) and from multidrug resistance gene 2(Mdr2 /Abcb4) gene knockout(gko) mice with biliary fibrosis,and in human end stage primary biliary cirrhosis(PBC).RESULTS:All three lymphocyte subsets expressed DPP8 and DPP9 ***8 and DPP9 expression were upregulated in both PWM and LPS stimulated mouse splenocytes and in both Jurkat T-and Raji B-cell ***8 and DPP9 were downregulated in DTT treated and upregulated in mitomycin-C treated Raji ***9transfected Raji cells exhibited more annexin V + cells and associated ***8 and DPP9 mRNA were upregulated in CCl 4 induced fibrotic livers but not in the lymphocytes isolated from such livers,while DPP9 was upregulated in EGF stimulated Huh7 *** contrast,intrahepatic DPP8 and DPP9 mRNA expression levels were low in the Mdr2 gko mouse and in human PBC compared to non-diseased ***:These expression patterns point to biological roles for DPP8 and DPP9 in lymphocyte activation and apoptosis and in hepatocytes during liver disease pathogenesis.

关键词： Dipeptidyl peptidase CD26 Lymphocytes Liver fibrosis Biliary fibrosis

Potential role of peripheral blood mononuclear cell' s mitochondrial respiratory dysfunction in heart failure severity prediction in patients with cardioverter-defibrillator implantation indications

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 Geriatric Cardiology 2024年第10期21卷 981-991页

作者： Tariel A Atabekov Sergey N Krivolapov Mikhail S Khlynin Viacheslav A Korepanov Tatiana yu.Rebrova Elvira F Muslimova Sergey A Afanasiev Roman E Batalov Sergey V popov Cardiology Research Institute Tomsk National Research Medical CenterRussian Academy of SciencesTomskRussia

Background It has been reported that the mitochondrial respiratory dysfunction (MRD) is important mechanisms affecting the heart failure (HF) *** sought to evaluate the potential role of MRD of peripheral blood mononuclear cells (PBMC) in HF severity prediction in patients with cardioverter-defibrillator implantation *** In this single-center study patients with HF of New York Heart Association (NYHA) Ⅰ-Ⅲ functional class (FC) and cardioverter-defibrillator implantation indications underwent transthoracic echocardiography (TTE) and MRD assessment using *** respiration rate (MRR) indicators (pyruvate+malate+adenosine diphosphate;succinate+adenosine diphosphate;pyruvate+malate–adenosine diphosphate[V4.1];succinate–adenosine diphosphate) were *** between HF NYHA FC,TTE and MRR indicators were *** on our data,we developed a risk model regarding HF *** Of 53 (100.0%) HF patients,33 (62.3%) had mild exercise intolerance (1stgroup) and 20 (37.7%) had moderate-to-severe exercise intolerance (2ndgroup).Patients with mild exercise intolerance were likely to have a higher V4.1(P<0.001) values.V4.1was independently associated with moderate-to-severe exercise intolerance in univariate and multivariate logistic regression (OR=0.932,95%CI:0.891–0.975,P<0.001).Conclusions The severity of HF is associated with PBMC mitochondrial respiratory dysfunction in patients with cardioverter-defibrillator implantation *** HF severity risk model including V4.1parameters is able to distinguish patients with mild and moderate-to-severe exercise *** investigations of their predictive significance are warranted.

关键词： severity patients indications

Web service for biodiversity estimation using remote sensing data

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2008年第4期1卷 367-376页

作者： Mikhail A.popov.Nataliia N.Kussul Sergey A.Stankevich Anna A.Kozlova Andrii yu.Shelestov Oleksii M.Kravchenko Mykhailo B.Korbakov Serhiy V.Skakun Scientific Centre for Aerospace Research of the Earth KievUkraine Department of Space Information Technologies and Systems Space Research Institute NASU-NSAUKievUkraine

This paper presents a technique for the assessment and mapping of land biodiversity by using remote sensing *** proposed approach uses a fuzzy model that encapsulates different ecological factors influencing *** imple... 详细信息

关键词： potential biodiversity index remote sensing data product pre-Black Sea region of the Ukraine web service

Measurement of Angular Distribution and Cross Section for ^(58)Ni(n,α)^(55)Fe Reaction at 5.1 MeV

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 nuclear physics 1995年第1期17卷 45-48页

作者： Tang Guo-you Bai Xin-hua Shi Zhao-min Chen Jin-xiang (Institute of Heary Ion Physics.Peking University.Beijing 100871)yu.M.Gledenov G.Khuuhenhuu yu.P.popov.(Joint Institute for Nuclear Research,Dubna 141980.Russia) *** Institute of Heavy Ion Physics Peking University Beijing 100871

The α-particle angular distribution of 58Ni（n,α）55Fe was measured at incidentneutron energy 5.1 MeV using a grid ionization *** fluence was deter-mined by fission of 238*** present results were compared with the t... 详细信息

关键词： Grid ionization chamber Fission chamber Angular distribution Cross section

THE USES OF APPLICATION OF SULFUR ORGANIC APROTIC SOLVENTS IN LITHIUM ENERGETICS

在线全文

学校读者我要写书评

暂无评论

THE USES OF APPLICATION OF SULFUR ORGANIC APROTIC SOLVENTS I...

Quantitative tracking of trans-synaptic nose-to-brain transport of nanoparticles and its modulation by odor,aging,and Parkinson’s disease

5th International Meeting on Lithium Batteries

作者： V.S.Kolosnitsyn A.V.popov.yu.E.Nikitin Institute of Chemistry Bashkirian Research CentreUSSR Acad.Sci.Ural DepartmentUfaU.S.S.R.

＜正＞This paper is a brief summary of systematic investigations carried out to study the physico-chemical and electrochemical characteristics of the known and some new sulfur organic aprotic solvents and their electrolyte systems and,besides,to clear up the regularities of transport and electrode events and the energy properties of some model lithium batteries with liquid and solid ***,sulfones, and sulfates were selected the subjects of research.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 7119-7133页

作者： Alexander V.Romashchenko Dmitrii V.Petrovskii Sergey yu.Trotsky Ksenia N.Morozova Nina B.Illarionova Maria V.Zhukova Elena V.Kiseleva Marina B.Sharapova Daniil S.Zuev Konstantin E.Kuper Sergey yu.Taskaev Anna I.Kasatova Dmitrii A.Kasatov Olga I.Solovieva Ivan A.Razumov ludmila A.Gerlinskaya Mikhail P.Moshkin yu.i M.Moshkin The Federal Research Center Institute of Cytology and Genetics SB RASAcademician Lavrentiev Avenue10Novosibirsk 630090Russia International tomography center Institutskaya st.3ANovosibirsk 630090Russia G.K.Boreskov Institute of Catalysis SB RASAcademician Lavrentiev Avenue5Novosibirsk 630090Russia The Federal Research Center Budker Institute of Nuclear Physics SB RASAcademician Lavrentiev Avenue11Novosibirsk 630090Russia Institute of Computational Technologies Academician M.A.Lavrentiev avenue6Novosibirsk 630090Russia Institute of Gene Biology Russian Academy of SciencesMoscow 117334Russia Institute of Molecular and Cellular Biology SB RASAcad.Lavrentiev Ave8/2Novosibirsk 630090Russia Federal Research Centre of Biological Systems and Agrotechnologies RASst.January 929Orenburg 460000Russia

Nanoparticles(NPs)can be transported via the nose-to-brain(N_(2)B)***,quantitative data on their spatiotemporal dynamics and regulation of the N_(2)B transport are largely *** surveyed metal oxide/hydroxide NPs as magnetic resonance imaging(MRI)contrasts for quantitative N_(2)B *** containing divalent transition metals were the only ones capable of N_(2)B *** T1-weighted(T1W)MRI,we showed that Mn_(3)O_(4)-NPs were readily engulfed by olfactory receptor neurons(ORNs)without disrupting olfactory sensing,we mapped their N_(2)B *** neurons,the Mn_(3)O_(4)-NPs were localized to the cytosol,mitochondria,vesicles,moved at mixed fast and slow axonal transport velocities intraand extra-vesicularly through *** NPs’axonal transport is dependent on neuronal activity and microtubule *** Mn_(3)O_(4)-NPs were trans-synaptically transmitted through at least four synapses across the olfactory ***-synaptic transmission of the NPs was dependent on N-type Ca^(2+)channels and NMDA receptors but blocked by GABAB receptor activation.A five-parameter Weibull signal increase/decrease model fitted to the T1W MRI data allowed for estimating kinetic parameters of Mn_(3)O_(4)-NP accumulation/*** and relative accumulation rates,but not elimination,correlated negatively with the number of synapses from ORNs,indicating a coupling of the NPs’N_(2)B transport with spontaneous neuronal ***,olfactory stimuli(2,5-dimethylpyrazine and acetophenone)significantly modulated and rerouted the Mn_(3)O_(4)-NP N_(2)B transport odor ***,the NPs’trans-synaptic transmission was impaired by aging and the onset of Parkinson’s *** data suggest new approaches to diagnostics,functional neuroimaging,controlling N_(2)B drug delivery.

关键词： Mn_(3)O_(4)nanoparticles magnetic resonance imaging(MRI) nose-to-brain transport trans-synaptic transmission olfactory stimulation