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Travel time prediction with viscoelastic traffic model

Applied Mathematics and Mechanics(English Edition) 2018年第12期39卷 1769-1788页

作者： Yongliang ZHANG M.N.SMiRNOVA a.i.bogdanova Zuojin ZHU N.N.SMiRNOV Faculty of Engineering Science University of Science and Technology of China Faculty of Mechanics and Mathematics Moscow M.V.Lomonosov State University Scientific Research institute for System Analysis Russian Academy of Sciences

Travel time through a ring road with a total length of 80 km has been predicted by a viscoelastic traffic model(VEM), which is developed in analogous to the non-Newtonian fluid flow. The VEM expresses a traffic pressure for the unfree flow case by space headway, ensuring that the pressure can be determined by the assumption that the relevant second critical sound speed is exactly equal to the disturbance propagation speed determined by the free flow speed and the braking distance measured by the average vehicular length. The VEM assumes that the sound speed for the free flow case depends on the traffic density in some specific aspects, which ensures that it is exactly identical to the free flow speed on an empty road. To make a comparison, the open Navier-Stokes type model developed by Zhang(ZHANG, H. M. Driver memory, traffic viscosity and a viscous vehicular traffic flow model. Transp. Res. Part B, 37, 27–41(2003)) is adopted to predict the travel time through the ring road for providing the counterpart *** the traffic free flow speed is 80 km/h, the braking distance is supposed to be 45 m,with the jam density uniquely determined by the average length of vehicles l ≈ 5.8 m. To avoid possible singular points in travel time prediction, a distinguishing period for time averaging is pre-assigned to be 7.5 minutes. it is found that the travel time increases monotonically with the initial traffic density on the ring road. Without ramp effects, for the ring road with the initial density less than the second critical density, the travel time can be simply predicted by using the equilibrium speed. However, this simpler approach is unavailable for scenarios over the second critical.

关键词： travel time viscoelastic modeling distinguishing period for time averaging spatial-temporal pattern traffic jam

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Traffic flow sensitivity to visco-elasticity

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Theoretical & Applied Mechanics Letters 2016年第4期6卷 182-185页

作者： M.N. Smirnova A.i. bogdanova Zuojin Zhu N.N. Smirnov Faculty of Mechanics and Mathematics Moscow M.V. Lomonosov State University Moscow 119992 Russia Faculty of Engineering Science University of Science and Technology of China Hefei 230026 China Scientific Research institute for System Analysis of Russian Academy of Sciences Moscow 117218 Russia Saint Petersburg State Polytechnical University St. Petersburg 195251 Russia

This letter reports traffic flow sensitivity to visco-elasticity, with the traffic flow modeling briefly described at first and then used to do traffic flow simulations whose results can reflect the properties of spatial-temporal evolution of ring traffic flow. it reveals that visco-elasticity plays crucial role in formation of traffic flow patterns, implying that self-organization of traffic flow is crucial in determining traffic flow status.

关键词： Viscoelastic modeling Self-organization Traffic flow sensitivity Flow pattern formation

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imetit Dihydrobromide and Thioperamide Medication in Cough Hypersensitivity Model—The Role of H₃ Receptors

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Open Journal of Molecular and integrative Physiology 2016年第1期6卷 1-9页

作者： Tomas Buday Eva Kovacova Silvia Gavliakova Natalia Kavalcikova-bogdanova Martina Antosova Jana Plevkova Department of Pathophysiology Biomedicine Centre Jessenius Faculty of Medicine Comenius University Martin Slovak Republic Department of Physiology Biomedicine Centre Jessenius Faculty of Medicine Comenius University Martin Slovak Republic Simulation Educational Center Jessenius Faculty of Medicine Comenius University Martin Slovak Republic

Chronic cough is a troublesome problem and it is frequently associated with diseases such as gastroesophageal reflux, asthma and upper airway diseases—so called diagnostic triade. The magnitude and severity of cough is strongly associated with the ongoing nasal inflammation in subjects with rhinosinusitis and treatment of nasal inflammation leads to the down regulation of pathologically up-regulated cough. Histamine plays a key role in the inflammation of the upper airways of different aetiologies;therefore histamine receptors seem to be promising targets. The aim of our study was to ascertain the effect of H3R agonist imetit and H3R antagonist thioperamide on cough and symptoms of allergic rhinitis (AR) in an animal model of upper airway cough syndrome in ovalbumin sensitized guinea pigs. OVA sensitized guinea pigs (n = 10) were repeatedly challenged with i.n. allergen-OVA to induce allergic rhinitis and to enhance cough reflex according to the validated model of experimental allergic rhinitis. Animals were pre-treated by i.p. administration of imetit (1 mg/kg and 2 mg/kg of body weight) and thioperamide 30 min. prior i.n. OVA administration. Rhinitis evaluation was based on the occurrence of typical symptoms. The effect on cough was assessed from the response to inhalation of citric acid (0.4 M, 10 min), final cough count and cough latency were analysed from the airflow traces, cough motor pattern and the cough sound. AR up-regulated the cough response from 9 ± 2 to 16 ± 1 cough per provocation, med ± iQR, p imetit (1 mg/kg) suppressed nasal symptoms and decreased number of cough from 16 ± 1 to 12 ± 1;however the data did not reach significance. imetit (2 mg/kg) significantly suppressed the nasal symptoms, and number of coughs from 16 ± 1 to 6 ± 2, med ± iQR, p ioperamide (5 mg/kg of body weight) did not have expected effects on tested parameters. H3R agonist imetit, unlike H3R antagonist thiopera

关键词： Chronic Cough Allergic Rhinitis Histamine Antitussive imetit Thioperamide H3 Receptor

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Characterization of human adipose-derived stem cells phenotype as potential cell material for hybrid organ construction

Characterization of human adipose-derived stem cells phenoty...

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第十届中俄双边新材料新工艺研讨会

作者： Surguchenko V.A. Ponomareva A.S. bogdanova N.B. Abramov V.Yu. Sevastianov V.i. Moscow institute of Physics and Technology(State University)141700 9Institutskii per.DolgoprudnyMoscow RegionRussia

＜正＞The immunophenotype of mesenchymal human adipose-derived stem cells is *** methods of isolation,culture and phenotyping are *** analysis has shown that mesenchymal human adipose-derived stem cells were positive for the cell-surface markers CD10,CD13,CD29,CD44,CD59,CD73,CD90,CD105,HLA-ABC and negative for the cell-surface markers CD34,CD45,CD71,CD133,and maintained this phenotype during at least five passages.

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Modulation of protein tyrosine phosphorylation in gastric mucosa during re-epithelization processes

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World Journal of Biological Chemistry 2010年第11期1卷 338-347页

作者： Olena V bogdanova Larysa i Kot Kateryna V Lavrova Volodymyr B Bogdanov Erica K Sloan Tetyana V Beregova Ludmyla i Ostapchenko Department of Biochemistry Taras Shevchenko National University of Kyiv Department of Human and Animal Physiology Taras Shevchenko National University of Kyiv Semel institute for Neuroscience and Human Behavior University of California Los Angeles Department of Pharmaco-physiology Taras Shevchenko National University of Kyiv

AiM:To investigate the role of protein tyrosine phosphorylation in gastric wound formation and repair following ulceration. METHODS:Gastric lesions were induced in rats using restraint cold *** investigate the effect of oxidative and nitrosative cell stress on tyrosine phosphorylation during wound repair,total activity of protein tyrosine kinase(PTK),protein tyrosine phosphatase (PTP),antioxidant enzymes,nitric oxide synthase (NOS), 2',5'-oligoadenylate synthetase,hydroxyl radical and zinc levels were assayed in parallel. RESULTS:Ulcer provocation induced an immediate decrease in tyrosine kinase(40% in plasma membranes and 56% in cytosol,(Pivity (threefold in plasma membranes and 3.3-fold in cytosol),followed by 2.3-2.4-fold decrease (Pin protein phosphotyrosine content in the gastric mucosa. Ulceration induced no immediate change in superoxide dismutase (SOD) activity,30% increase (Pin catalase activity,2.3-fold inhibition (Pione peroxidase,3.3-fold increase (Pin hydroxyl radical content,and 2.3-fold decrease (Pin zinc level in gastric *** activity was three times higher in gastric mucosa cells after cold stress. Following ulceration,PTK activity increased in plasma membranes and reached a maximum on day 4 after stress (twofold increase,Pined inhibited(1.6-3-fold decrease on days 3,4 and 5,Pin the *** phosphatases remained inhibited both in membranes and cytosol(1.5-2.4-fold,Pivity remained increased on days 1,2 and 3(3.8-,2.6-,2.2-fold,respectively,Pivity of SOD increased 1.6 times(Pivity normalized after day 2. Glutathione peroxidase activity and zinc level decreased (3.3-and 2-fold,respectively,Pivity of 2',5'-oligoadenylate synthethase increased 2.8-fold (Pinning,and 1.6-2.3-fold (Ping ulcer recuperation,and normalized on da

关键词： Protein tyrosine kinase Protein tyrosine phosphatase Antioxidants Gastric ulcer Wound repair

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MMS星座对磁层顶磁通量绳内离子惯性尺度结构的观测

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空间科学学报 2018年第2期38卷 147-168页

作者：刘杨濮祖荫谢伦郭瑞龙王晓钢肖池阶史全岐 DUNLOP M bogdanova Y V MOORE T E RUSSELL C T LiNDQViST P A TORBERT R B POLLOCK C ZHAO Cong 北京大学地球与空间科学学院北京100871 中国科学院地质与地球物理研究所北京100029 哈尔滨工业大学物理系哈尔滨150001 北京大学物理学院北京100871 山东大学空间科学与物理学院威海264209 RAL Space Rutherford Appleton LaboratorySTFCDidcotOX11 0QXUK Goddard Space Flight Center NASAGreenbeltMDUSA University of California Los AngelesCAUSA Royal institute of Technology StockholmSweden University of New Hampshire DurhamNHUSA

利用MMS观测数据,对磁层顶通量绳内离子惯性尺度(d_i)的结构进行分析研究.结果发现,许多不同尺度(约1d_i至数十d_i)的通量绳内都存在具有d_i尺度的电流j_m,其方向在磁层顶局地坐标系的-M方向,即与磁层顶查普曼-费拉罗电流同向,由电子在+... 详细信息

利用MMS观测数据,对磁层顶通量绳内离子惯性尺度(d_i)的结构进行分析研究.结果发现,许多不同尺度(约1d_i至数十d_i)的通量绳内都存在具有d_i尺度的电流j_m,其方向在磁层顶局地坐标系的-M方向,即与磁层顶查普曼-费拉罗电流同向,由电子在+M方向的运动(v_(em))携带.这些电流结构具有以下特征:磁鞘与磁层成分混合,磁场为开放形态;离子去磁化,电子与磁场冻结;N方向(即垂直于磁层顶电流片方向)的电场E_n显著增大,幅度达到约20 mV·m^(-1),并伴有明显的尖峰状起伏,该增强和尖峰状起伏的电场对应于霍尔电场.分析表明,电流、电子与离子运动的偏离以及霍尔电场之间遵从广义欧姆定律,三者密切关联.进一步对磁层顶磁重联的探测数据进行分析发现,在很多重联区内也存在与通量绳内相似的结构,其尺度约为d_i量级,其中霍尔电场E_N、电流j_M和电子速度v_(eM)均与通量绳内对应物理量的方向相同且幅度相近.基于上述观测事实,采用经典FTE通量绳模型,对通量绳内电流、电子运动和霍尔电场的起源进行了初步探讨,认为其来源于磁层顶无碰撞磁重联区内的相应结构,并且后者在离子尺度通量绳的形成过程中起到重要作用.

关键词：磁通量绳离子尺度电流霍尔电场磁层顶磁重联

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