检索结果-南通市图书馆

Predicting effects of tunnel throttling of annular freeway vehicular flow by a continuum model

Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 733-746页

作者： Zhongmin Huang m.N.smirnova N.N.smirnov Zuojin Zhu Faculty of Engineering science University of Science and Technology of ChinaHefei 230026China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Faculty of mechanics and mathematics Lomonosov Moscow State UniversityMoscow 119992Russia

Fluid flow throttling is common in industrial and building services *** tunnel throttling of vehicular flow is caused by the abrupt number reduction of roadway lane,as the tunnel has a lower lane number than in the roadway normal *** predict the effects of tunnel throttling of annular freeway vehicular flow,a three-lane continuum model is ***Ⅲof the tunnel is completely blocked due to the need of tunnel rehabilitation,*** exists mandatory net lane-changing rate from laneⅢto laneⅡjust upstream of the tunnel entrance,which is described by a model of random number generated through a golden section *** net-changing rate between adjacent lanes is modeled using a lane-changing time expressed explicitly in algebraic *** paper assumes that the annular freeway has a total length of 100 km,a two-lane tunnel of length 2 km with a speed limit of 80 km/*** free flow speeds on lanesⅠ,ⅡandⅢare assumed to be 110,100 and 90 km/h *** on the three-lane continuum model,numerical simulations of vehicular flows on the annular freeway with such a tunnel are conducted with a reliable numerical method of 3rd-order *** results reveal that the vehicular flow has a smaller threshold of traffic jam formation in comparison with the case without tunnel *** fuel consumption can be estimated by interpolation with time averaged grid traffic speed and an assumed curve of vehicle *** vehicle fuel consumption is lane number dependent,distributes with initial density concavely,ranging from 5.56 to 8.00 *** throttling leads to an earlier traffic jam formation in comparison with the case without tunnel throttling.

关键词： Effects of tunnel throttling Vehicle fuel consumption Travel time Threshold of traffic jam formation Continuum model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diversity of Botryosphaeriaceae species associated with grapevine and other woody hosts in Italy,Algeria and Tunisia,with descriptions of Lasiodiplodia exigua and Lasiodiplodia mediterranea ***

引用

Fungal Diversity 2015年第2期71卷 201-214页

作者： B.T.Linaldeddu A.Deidda B.scanu A.Franceschini s.serra A.Berraf-Tebbal m.Zouaoui Boutiti m.L.Ben jamâa A.J.L.Phillips Dipartimento di Agraria Sezione di Patologia vegetale ed EntomologiaUniversitàdegli Studi di Sassarivia E.De Nicola 107100 SassariItaly Département des Biotechnologies Facultédes Sciences de la Vie et de la TerreUniversitéSaad Dahleb09000 BlidaAlgeria INRGREF Laboratoire de Gestion et de Valorisation des Ressources ForestièresB.P.N 22080 ArianaTunisia Centro de Recursos microbiológicos Departamento de Ciências da VidaFaculdade de Ciências e TecnologiaUniversidade Nova de Lisboa2829-516 CaparicaPortugal

The diversity of Botryosphaeriaceae species associated with“Botryosphaeria dieback”of grapevine was investigated in 18 vineyards in sardinia,*** isolates obtained from different woody hosts including holm oak,sweet orange and broom bush in Italy,Algeria and Tunisia were also *** and cultural characteristics as well as ITs and EF1-αsequence data were used to identify the fungal ***-eight botryosphaeriaceous isolates were obtained from 113 symptomatic grapevine samples,from which ten species were *** seriata was the dominant species(25%of isolates),followed by Neofusicoccum parvum(21.7%).Two species,Diplodia olivarum and *** are reported for the first time on *** addition,two new species namely Lasiodiplodia mediterranea *** grapevine,holm oak and sweet orange and Lasiodiplodia exigua *** broom bush are *** artificial inoculation experiments conducted on excised green grapevine shoots and lignified canes as well as holm oak seedlings,*** was shown to be an aggressive pathogen.

关键词： Citrus×sinensis Diplodia Lasiodiplodia Neofusicoccum Quercus ilex Retama raetam

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Gorgan Bay： a microcosm for study on macrobenthos speciesenvironment relationships in the southeastern Caspian sea

引用

Acta Oceanologica sinica 2016年第4期35卷 82-88页

作者： GHAsEmI Amir Faraz TAHERI mehrshad FOsHTOmI maryam Yazdani NORANIAN majid mIRA seyed sahab jam Armin Iranian National Institute for Oceanography and Atmospheric science (INIOAs) Tehran *** Iran Department of the Environment Golestan Province Gorgan *** Iran

The relationship between spatial patterns of macrobenthos community characteristics and environmental conditions（salinity, temperature, dissolved oxygen, organic matter content, sand, silt and clay） was investigated throughout the Gorgan Bay in June 2010. Principal components analysis（PCA） based on environmental data separated eastern and western stations. The maximum（4 500 ind./m2） and minimum（411 ind./m2） densities were observed at stas 1 and 6, respectively. Polychaeta was the major group and streblospio gynobranchiata was dominant species in the bay. According to Distance Based Linear models results, macrofaunal total density was correlated with silt percentage and salinity and these two factors explaining 64% of the variability while macrofaunal community structure just correlated with salinity（22% total variation）. In general, western part of the bay showed the highest number of species and biodiversity while, the highest density was found at sta. 1 and in the middle part of the bay. Furthermore, relationship between diversity indices and macrobenthic species with measured factors is also discussed. Our results confirm the effect of salinity as an important factor on distribution of macrobenthic fauna in south Caspian brackish waters.

关键词： salinity macrobenthos species-environment relationship Gorgan Bay Caspian sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Estimation of Hourly and Daily Global solar Radiation at Clear Days Using an Approach Based on modified Version of Gaussian Distribution

引用

Advances in Atmospheric sciences 1996年第3期13卷 349-358页

作者： s.m EI shazly Department of Physics.Faculty of science South Valley UniversityQenaA.R.Egypt

The performance of two models,jam and Baig,based on the modified version of Gaussian distribution function in estimating the daily total of global solar radiation and its distribution through the hours of the day from sunrise to sunset al any clear day is evaluated with our own measured data in the period from June 1992 to may 1993 in Qena Egypt The results show a high relative deviation of calculated values from measured ones,especially for Jain model,in the most hours of the day,except for those near to local *** misfit behavior is quite obvious in the early morning and late afternoon A new approach has been proposed in this paper to estimate the daily and hourly global solar radiation This model performs with very high accuracy on the recorded data in our *** validity of this approach was verified with new measurements in some clear days in June and August *** resultant very low relative deviation of the calculated values of global solar radiation from the measured ones confirms the high performance of the approach proposed in this work

关键词： Glohal solar radiation,. measurements models Gaussian distribution function statistical treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative study of Anaplasma parasites in tick carrying buffaloes and cattle

引用

Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2005年第11期6卷 1057-1062页

作者： RAJPUT Z.I. 胡松华 ARIJO A.G. HABIB m. KHALID m. Directorate of Animal Husbandry Shahbaz Building Block-A Sindh Hyderabad Pakistan Department of Veterinary medicine School of Animal Science Zhejiang University Department of Parasitology Sindh Agriculture UniversityTando Jam Pakistan Department of Veterinary microbiology University of Agriculture Faisalabad Pakistan Department of Biological sciences Quaid-e-Azam University Islamabad Pakistan

A comparative study on the prevalence of Anaplasma parasite was conducted on ticks carrying buffaloes and cattle. Five hundred blood samples of both animals (250 of each) were collected during February, march and April. Thin blood smears on glass slides were made, fixed in 100% methyl alcohol and examined. microscopic examination revealed that 205 (41%) animals had Anaplasma parasites, out of which 89, 44 and 72 animals had Anaplasma marginale, Anaplasma centrale and mixed infection respectively. Infected buffaloes and cattle were 75 and 130 respectively. The infection in female was 53 and 92 in buffaloes and cattle respectively. Twenty-two and 92 blood samples of male were found positive in buffaloes and cattle respectively. Com- parative study revealed that the cattle were 26.82% more susceptible than buffaloes. The parasite prevailing percentage in female of both animals was slightly higher than that of the male. This investigation was aimed at studying the comparative prevalence of Anaplasma parasite in tick carrying buffaloes and cattle.

关键词： Anaplasma marginale Anaplasma centrale Buffaloes Cattle Ticks

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diverse outcomes of species interactions in an invaded annual plant community

引用

Journal of Plant Ecology 2017年第6期10卷 918-926页

作者： Claire E.Wainwright John m.Dwyer Richard J.Hobbs margaret m.mayfield The Ecology Centre School of Biological SciencesBuilding 8The University of QueenslandSt LuciaQueensland 4072Australia Commonwealth scientific and Industrial Research Organisation Land and WaterEcoSciences PrecinctDutton ParkQueensland 4001Australia school of Plant Biology The University of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia

Aims Despite acknowledgement that interactions among native and exotic species are important for determining the structure and diversity of novel communities,directed experiments using mul-tiple exotics from the same system are *** observational studies have highlighted distinct ways that exotic species interface with resident natives across invaded *** correlative nature of these studies,however,has provided few details about the mechanisms driving distinct interaction outcomes within the same *** aim was to determine how three exotic annual plant species with distinct relationships with local plant diversity impact the performance of a co-occurring native annual in the York gum-jam woodlands of Western *** We grew species in experimental communities in growth chambers at varying total planting densities to assess how interaction out-comes varied among natives and exotics across a gradient of com-petition *** measured a variety of performance responses,including survival,biomass and population-level and individual-level reproductive *** Findings Overall,the effects of interspecific versus intraspecific competi-tion on performance varied with the identity and density of exotic *** exploitative exotic grass Bromus madritensis was dominant in polyculture,whereas the diminutive grass Pentameris airoides conferred weak intraspecific competition and interspe-cific facilitation on native Waitzia *** exotic broadleaf forb,Hypochaeris glabra,suppressed growth and survival of ***,while *** had weakly negative,neutral or positive effects on all *** outcomes highlight the complexity of interac-tions impacting the diversity,stability and structure of novel plant *** few of these communities contain a single exotic species,understanding the competitive dynamics occurring in diverse novel communities is critical for their conservation and restoration.

关键词： annual plants biotic interactions competition invasion novel ecosystems

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Travel time prediction with viscoelastic traffic model

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

stabilization of Traffic Flow Based on the multiple Information of Preceding Cars

引用

Communications in Computational Physics 2008年第4期3卷 899-912页

作者： D.F.Xie Z.Y.Gao X.m.Zhao state Key Laboratory of Rail Traffic Control and safety Beijing Jiaotong UniversityBeijing 100044China. Institute of system science School of Traffic and TransportationBeijing Jiaotong UniversityBeijing 100044China.

To enhance the stability of traffic flow,a new car-following model is proposed by taking into account the support of intelligent transportation system(ITs)information,which includes both the headway and the velocity difference of multiple preceding *** new model is based on the Optimal Velocity(OV)model and its extended *** stability condition of the model is obtained by using the linear stability *** nonlinear analysis,the modified Korteweg-de Vries equation is constructed and solved,and the traffic flow is classified into three types,***,metastable,and *** jam phase can thus be described by the kink-antikink soliton solution for the mKdV *** numerical simulation results show that compared with previous models considering only one of the ITs information,the proposed model can suppress traffic jams more efficiently when both headway and velocity difference of arbitrary preceding cars are taken into *** results of numerical simulation coincide with the theoretical ones.

关键词： Traffic flow car-following model stability analysis ITs information

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Long-Term Oral Corticosteroid-Therapy: Description of the Practice of Adjuvant measures by Dakar medical specialists

引用

Open Journal of Rheumatology and Autoimmune Diseases 2020年第2期10卷 70-78页

作者： m. Dieng B. Djiba m. sow B. s. Kane J. T. Ahouandogbo m. Ba m. A. Ndour B. C. Fall m. Niasse N. Diagne A. C. Ndao A. Faye s. Ndongo A. Pouye Department of Internal medicine Aristide Le Dantec Hospital Dakar-Etoile Senegal Department of Internal medicine Dalal Jam Hospital Dakar Senegal Department of Rheumatology Aristide Le Dantec Hospital Dakar-Etoile Senegal

Introduction: The extended administration of corticoids by oral way for a length of more than 3 months defines the long-term-corticosteroid-therapy. This one, used in numerous indications, displays most often at the risk of undesirable effects linked sometimes to the habits of prescription of the doctors. Patients and methods: In order to study the prescription modalities of this treatment, we conducted a cross-sectional, multicentric and descriptive study from June 1st, 2017 to August 1st, 2017, over a period of 2 months. It involved a questionnaire given to medical specialists of all medical specialties and practicing in the University Hospital of Dakar. Results: 170 doctors were interviewed. Dermatologists and internists were mostly found 19.4% and 18.8% or 33% and 34% doctors. systemic autoimmune diseases alone accounted for 48% of prescription reasons. Prednisone was prescribed in 88% of cases. The immunosuppressive dose of 1 mg/kg was most often prescribed. Practitioners very heterogeneously prescribe most adjuvant measures to prolonged systemic corticosteroid therapy. Thus, the recommendation of a low-sodium diet (38% of physicians), and the systematic prescriptions of proton pump inhibitors (44.7% of physicians) and vitamin-calcium supplementation were frequently performed by physicians (34% of physicians). While the low carbohydrate diet was advocated by less than a quarter of doctors and the prevention of pneumocystosis and osteoporosis were rare (respectively 61% and 52% of prescribers did not). Conclusion: The global analysis of the habits of our medical specialists concerning the use of long-term glucocorticoids reflected a diversity of indications, heterogeneity of practices, with certain habits not in accordance with the usual recommendations.

关键词： Corticosteroid Long-Term Oral Corticosteroid systemic Disease Adjuvant measures

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effectivity of Thromboprophylxie in Dakar’s medical Areas

引用

Open Journal of Internal medicine 2020年第1期10卷 35-43页

作者： B. Djiba m. Dieng C. m. A. Halim m. sow B. s. Kane m. A. Ndour B. C. Fall N. Diagne A. C. Ndao A. Faye s. Ndongo A. Pouye Department of Internal medicine Aristide Le Dantec Hospital Dakar-Étoile Senegal Department of Internal medicine Dalal Jam Hospital Dakar Senegal

Introduction: Venous thromboembolic disease (VTE) is a real public health problem worldwide. The practice guide produced periodically by the American College of Chest Physicians (ACCP) has become the international standard. However, thromboprophylaxis remains underused. methodology: We carried out a descriptive cross-sectional study. The goals of that study were to evaluate the effectiveness of the practice of thromboprophylaxis in the various medical services of the Dakar Public Hospitals. Our investigation was conducted for two weeks in september 2017. Results: 160 patients were included (81 men and 79 women) in our series, with male predominance: sex ratio of 1.02. The average age was 48. Infectious pathologies were the predominant clinical pictures (35% of cases). The thromboembolic risk factors (RF) mainly found were represented by prolonged bed rest, followed by cardiovascular (RF): age greater than 60 years (31.2%), hypertension (8.8%), obesity (4.4%) and diabetes (3.8%). The thromboembolic RF of patients hospitalized in these medical services has been evaluated empirically. We noted a lack of use of the VTE risk assessment scores. 40.9% (n = 56) of patients received overall VTE prophylaxis, a rate corresponding to almost half of those at risk (51.4%). This result reflects an under-use of thromboprophylaxis in the Dakar medical environment and a low level of adherence by practicians to the guidelines on VTE prophylaxis. Conclusion: It is therefore recommended to develop a national strategy to assess patients at risk for VTE, as well as measures to educate and inform doctors about the appropriate forms of thromboprophylaxis.

关键词： Thromboprophylaxis Anticoagulant Thromboembolic Disease

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：