检索结果-南通市图书馆

Genetic analysis for geographic isolation comparison of brown bears living in the periphery of the Western Carpathians Mountains with bears living in other areas

引用

Open Journal of Genetics 2013年第3期3卷 174-182页

作者： Jan Graban Jana Kiskova pavol.pepich Robin Rigg Institute of the High Mountain Biology University of Zilina Tatranska JavorinaTatranska JavorinaSlovak Republic Institute of Foreign Languages University of ZilinaZilinaSlovak Republic Slovak Wildlife Society Liptovsky HradokSlovak Republic

Populations of the European brown bear (Ursus arctos L.) differ substantially in size, degree of geographic isolation and level of genetic diversity. Present patterns result from phylogeographic processes and profound human intervention. We assessed the genetic variability of a subpopulation of brown bears near the periphery of their range in the Western Carpathian Mountains and compared their genetic properties with those of bears in the core of the same population and elsewhere. Samples were collected non-invasively in 2007-2008 and2010 in Strázovské Vrchy Protected Landscape Area (PLA) in Slovakia (included in the NATURA 2000 networking programme). Seven polymorphic microsatellite loci (UaMU26, UaMU64, G10B, G1D, G10L, UaMU50 and UaMU51) were amplified using a nested PCR in order to assess the following parameters: variability, allelic combinations, heterozygosity, number of alleles and inbreeding coefficient. Sufficient brown bear DNA for analysis was obtained from 57 out of 140 samples (41%), among which 45 different genotypes were identified. Loci had a mean of 2.71 ± 0.76 alleles. Average observed heterozygosity was 0.59. The inbreeding coefficient was negative for all but one of the analysed loci (2007-2008). In the year 2010 was negative three of seven loci. These results imply that gene flow with other parts of the population has been maintained in the reduced level and the isolation level of bears in the study area was not so low. Nevertheless, the genetic variability of bears in Strázovské Vrchy PLA was lower than that reported from other localities in the Carpathian Mountains. The results are discussed in the context of behavioural ecology and conservation genetics.

关键词： Carpathian Mountains European Brown Bear Ursus arctos L. Genetic Diversity Microsatellite Markers Non-Invasive Sampling

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

Rheology of Poly(vinyl butyral)Solution Containing Fumed Silica in Correlation with Electrospinning

引用

Chinese Journal of Polymer Science 2018年第6期36卷 742-748页

作者： Petra Peer Martina Polaskova pavol Suly Institute of Hydrodynamics of the Czech Academy of Sciences Pod Patankou 5166 12 Prague 6Czech Republic Centre of Polymer Systems Tomas Bata University in Zlintrida Tomase Bati 5678760 O1 ZlinCzech Republic Department of Polymer Engineering Faculty of TechnologyTomas Bata University in ZlinVavreckova 27576001 ZlinCzech Republic

The rheological properties in question are influenced by many factors, ranging from the characteristics of the given polymer or solvent to the flowing conditions. The primary focus of this study is to analyse the rheological behaviour of poly（vinyl butyral）—Mowital B 60 H—（PVB） solutions dissolved in methanol and a blend of these with fumed silica nanoparticles. The preparation of the nanofibrous web and the quality of nanofibres were correlated with the rheology of the polymer solution. It was discerned that drastically intensifying shear viscosity and the elasticity of the solution exerted a negligible effect on the formation of fibres, a finding which has rarely been discussed in the literature. The morphologies and structures of the PVB/silica nanofibrous membranes were investigated by scanning electron microscopy, thermogravimetric analysis and Fourier transform infrared spectroscopy.

关键词： Electrospinning Nanofibres Poly(vinyl butyral) Fumed silica Rheology

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

DNA diagnostics for reliable and universal identification of Helicobacter pylori

引用

World Journal of Gastroenterology 2021年第41期27卷 7100-7112页

作者： pavol Sulo Barbora Šipková Department of Biochemistry Comenius UniversityBratislava 84215Slovakia

Reliable diagnostics are a major challenge for the detection and treatment of Helicobacter pylori(***)*** at the forefront are non-invasive urea breath test(UBT)and stool antigen test(SAT).Polymerase chain reaction(PCR)is not endorsed due to nonspecific primers and the threat of *** specificity of DNA amplification can be achieved by nested PCR(NPCR),which involves two rounds of *** the primers are properly designed for the variable regions of the 16S rRNA gene,it is not difficult to develop an NPCR assay for the unambiguous identification of *** NPCR for a 454 bp amplicon was validated on 81 clinical biopsy,stool,and saliva samples,each from the same individuals,and compared with available *** assays,namely histology,rapid urease test,SAT,and *** assay was much more sensitive than simple PCR,and it was equally sensitive in biopsy samples as the 13CUBT test,which is considered the gold *** addition,it is sufficiently specific because sequencing of the PCR products exclusively confirmed the presence of ***-specific ***,due to the threshold and lower abundance,the sensitivity was much lower in amplifications from stool or *** detection in saliva also complicates the ability of *** to survive in the oral cavity aside from and independent of the *** reason for the lower sensitivity in stool is DNA degradation;therefore,a new NPCR assay was developed to obtain a shorter 148 bp 16S rRNA *** assay was validated on stool samples from 208 gastroenterological patients and compared to SAT ***,this NPCR revealed the presence of *** in twice the number of samples as SAT,indicating that many patients are misdiagnosed,not treated by antibiotics,and their problems are interpreted as ***,it is unclear how to properly diagnose *** in *** the first approach,SAT or UBT is *** samples are negative,the 148 bp ampl

关键词： Chronic diseases Helicobacter pylori Diagnostics Nested polymerase chain reaction DNA sequencing Detection limit

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

Coordination Control of Power Flow Controller and Hybrid DC Circuit Breaker in MVDC Distribution Networks

引用

Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1257-1268页

作者： Jianquan Liao Niancheng Zhou Zian Qin Pavel Purgat Qianggang Wang pavol Bauer IEEE School of Electrical Engineering Sichuan University State Key Laboratory of Power Transmis-sion Equipment and System Security and New Technology Chongqing University Department of Electrical Sustainable Energy DC SystemsEnergy Conversion andStorage Group

The two main challenges of medium voltage direct current(MVDC)distribution network are the flexible control of power flow(PF)and fault *** this paper,the power flow controller(PFC)is introduced to regulate the PF and inhibit the fault current during the DC *** coordination strategy of series-parallel PFC(SP-PFC)and hybrid DC circuit breaker(DCCB)is *** regulating the polarity and magnitude of SP-PFC output voltage during the fault,the rising speed of fault current can be suppressed so as to reduce the breaking current of hybrid *** access mode of SP-PFC to the MVDC distribution network and its topology are analyzed,and the coordination strategy between SP-PFC and hybrid DCCB is ***,the emergency control and bypass control strategies of SP-PFC are *** this basis,the mathematical model of SP-PFC in different fault stages is *** the equivalent model of SP-PFC,the fault current of the MVDC distribution network can be calculated accurately.A simulation model of the MVDC distribution network containing SP-PFC is established in MATLAB/*** fault current calculation result is compared with the simulation result,and the effectiveness of the proposed coordination strategy is verified.

关键词： Medium voltage direct current(MVDC)distribution network fault current power flow controller(PFC) DC circuit breaker(DCCB)

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

Python Supervised Co-simulation for a Day-long Harmonic Evaluation of EV Charging

引用

Chinese Journal of Electrical Engineering 2021年第4期7卷 15-24页

作者： Lu Wang Zian Qin Lucia Beloqui Larumbe pavol Bauer Department of Electrical Sustainable Energy Delft University of TechnologyDelft 2628 CDNetherlands

To accurately simulate electric vehicle DC fast chargers'(DCFCs')harmonic emission,a small time step,i.e.,typically smaller than 10μs,is required owing to switching ***,in practice,harmonics should be continuously assessed with a long duration,e.g.,a day.A trade-off between accuracy and time efficiency thus *** address this issue,a multi-time scale modeling framework of fast-charging stations(FCSs)is *** the presented framework,the DCFCs'input impedance and harmonic current emission in the ideal grid condition,that is,zero grid impedance and no background harmonic voltage,are obtained based on a converter switching model with a small timescale *** a DCFC's input impedance and harmonic current source are functions of the DCFC's load,the input impedance and harmonic emission at different loads are ***,they are used in the fast-charging charging station modeling,where the DCFCs are simplified as Norton equivalent *** the station level simulation,a large time step,i.e.,one minute,is used because the DCFCs'operating power can be assumed as a constant over a *** this co-simulation,the FCSs'long-term power quality performance can be assessed time-efficiently,without losing much accuracy.

关键词： Power quality harmonic modeling charging infrastructure for electric vehicles(EVs)

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

医用TC4钛合金激光-化学复合抛光及表面形貌演化

引用

中国表面工程 2024年第2期37卷 227-237页

作者：邵勇孙树峰王萍萍蒙卡·彼得·帕沃尔陈博文张丰云王茜孙维丽青岛理工大学机械与汽车工程学院青岛266520 青岛理工大学信息与控制工程学院青岛266520 斯洛伐克科希策技术大学制造技术学院普雷绍夫08001 青岛黄海学院智能制造学院青岛266427

表面粗糙度是医疗器械构件最重要的质量特征之一,然而现有的激光抛光、化学抛光等单一表面抛光技术存在一定局限性。针对医用TC4钛合金表面的精密抛光需求,设计并搭建一套激光-化学复合抛光系统,通过激光-化学复合加工材料去除机理分析... 详细信息

表面粗糙度是医疗器械构件最重要的质量特征之一,然而现有的激光抛光、化学抛光等单一表面抛光技术存在一定局限性。针对医用TC4钛合金表面的精密抛光需求,设计并搭建一套激光-化学复合抛光系统,通过激光-化学复合加工材料去除机理分析和开展TC4钛合金的激光-化学复合抛光试验,深入探究复合抛光过程中不同抛光阶段材料表面形貌的演变过程及粗糙度变化并进行分析,进而明确激光-化学复合抛光机理。研究结果表明,激光-化学复合抛光材料去除是基于激光热-力效应与激光诱导化学腐蚀溶解共同作用的结果,而且两者具有一定协同效应,在适当的工艺窗口内,化学腐蚀溶解可以完全去除激光烧蚀产生的残渣和重熔物。激光辐照会在工件表面“峰-谷”区域产生温度差,进而导致化学溶解速率差异,即“山峰”区域溶解速率快,“山谷”区域溶解速率慢,从而实现表面粗糙度的降低。最后采用合适的工艺参数,优化了抛光效果,实现了医用TC4钛合金的选择性精密抛光,激光辐照区域表面粗糙度Ra由初始的5.230μm下降至0.225μm,Sa由初始的8.630μm下降至0.571μm,分别下降95.7%和93.4%。研究结果可为钛合金或其他自钝化金属的精密抛光提供参考。

关键词：激光钛合金抛光表面形貌化学腐蚀

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

Period variations of Algol-type eclipsing binaries AD And, TW Cas and IV Cas

引用

Research in Astronomy and Astrophysics 2018年第4期18卷 115-122页

作者： Stefan Parimucha pavol Gajdos Viktor Kudak Miroslav Fedurco Martin Vanko Institute of Physics Faculty of Science University of E J. Safarik 044 01 Kosice Slovakia Astronomical Institute Slovak Academy of Sciences 059 60 Tatranska Lomnica Slovakia

We present new analyses of variations in O-C diagrams of three Algol-type eclipsing binary stars：AD And,TW Cas and IV *** have used all published minima times（including visual and photographic）as well as newly determined ones from our and Super Wasp *** determined orbital parameters of 3^（rd） bodies in the systems with statistically significant errors,using our code based on genetic algorithms and Markov chain Monte Carlo *** confirmed the multiple nature of AD And and the triple-star model of TW Cas,and we proposed a quadruple-star model of IV Cas.

关键词： binaries close — binaries eclipsing — techniques photometric — stars individual(AD And TW Cas IV Cas)

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

Status and outlook of hiking trails in the central part of the Low Tatra Mountains in Slovakia between 1980–1981 and 2013–2014

引用

Journal of Mountain Science 2018年第8期15卷 1615-1632页

作者： HRNCIAROVá Tatiana KENDERESSY pavol SPULEROVá Jana VLACHOVICOVá Miriam PISCOVá Veronika DOBROVODSKá Marta Institute of Landscape Ecology of the Slovak Academy of Sciences Stefanikova 3P.O.Box 254814 99 BratislavaSlovak Republic Institute of Landscape Ecology of the Slovak Academy of Sciences Branch NitraP.O.Box 22Akademicka 2949 01 NitraSlovak Republic

This study presents a methodology for assessment of the condition of hiking trails(HTs) and their impact zones in the central part of the Low Tatra mountain range, based on comparison of two complex data sets gathered in 33 years apart. The first field investigation was performed in 1980 and 1981, and the second in 2013 and 2014. The main goal was to perform a landscape typology in order to assess the susceptibility of landscape complexes to occurrence of anthropogenic and natural destruction processes and to assess the condition and prospects of HTs and their impacts on the adjacent alpine environment. Landscape complexes were characterised by selected abiotic, biotic and technical parameters of HTs and their impact zones. Due to the high variability of these parameters over the length of the HTs, we had to decide on how to map them. This was done using a square grid with 100 m-sized cells. For each cell with HT, the parameters were assigned the typical value within that cell. In total, 26.3 km of HT were studied, stretching over 266 grid cells. On comparison of the two data sets, it was seen that, 64%(171 grid cells) display a generally positive condition, with 54%(143 grid cells) even exhibiting significant improvement or continuously positive state of their condition. 36%(95 grid cells) were in bad condition, including 3%(9 grid cells) whose state had deteriorated, and 2%(6 grid cells) whose state had significantly deteriorated, in the time between the two assessments.

关键词： Hiking trails Degradation Tourist pressure Monitoring hiking trail changes Low Tatras Mountains Slovakia

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

High-resolution genome-wide association study of a large Czech collection of sweet cherry (Prunus avium L.) on fruit maturity and quality traits

引用

Horticulture Research 2023年第1期10卷 113-127页

作者： Kateřina Holušová JanaČmejlová pavol Suran RadekČmejla JiříSedlák Lubor Zelený Jan Bartoš Centre of the Region Hanáfor Biotechnological and Agricultural Research Institute of Experimental Botany of the Czech Academy of Sciencesšlechtitelu 31Olomouc77900Czech Republic Research and Breeding Institute of Pomology Holovousy Ltd. Holovousy 129Holovousy50801Czech Republic

In sweet cherry(Prunus avium L.),quantitative trait loci have been identified for fruit maturity,colour,firmness,and size to develop markers for marker-assisted ***,resolution is usually too low in those analyses to directly target candidate genes,and some associations are *** contrast,genome-wide association studies are performed on broad collections of accessions,and assemblies of reference sequences from Tieton and Satonishiki cultivars enable identification of single nucleotide polymorphisms after whole-genome sequencing,providing high marker *** hundred and thirty-five sweet cherry accessions were sequenced and phenotyped for harvest time and fruit colour,firmness,and ***-wide association studies were used to identify single nucleotide polymorphisms associated with each trait,which were verified in breeding material consisting of 64 additional accessions.A total of 1767106 single nucleotide polymorphisms were *** that density,significant single nucleotide polymorphisms could be linked to co-inherited haplotype blocks(median size∼10 kb).Thus,markers were tightly associated with respective phenotypes,and individual allelic combinations of particular single nucleotide polymorphisms provided links to distinct *** addition,yellow-fruit accessions were sequenced,and a∼90-kb-deletion on chromosome 3 that included five MYB10 transcription factors was associated with the ***,the study confirmed numerous quantitative trait loci from bi-parental populations using high-diversity accession populations,identified novel associations,and genome-wide association studies reduced the size of trait-associated loci from megabases to kilobases and to a few candidate genes per ***,a framework is provided to develop molecular markers and evaluate and characterize genes underlying important agronomic traits.

关键词： fir breeding maturity

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

On the helium bubble swelling in nano-oxide dispersion-strengthened steels

引用

Journal of Materials Science & Technology 2022年第10期105卷 172-181页

作者： Vladimir Krsjak Tielong Shen Jarmila Degmova Stanislav Sojak Erik Korpas pavol Noga Werner Egger Bingsheng Li Vladimir Slugen Frank A.Garner Slovak University of Technology Faculty of Electrical Engineering and Information TechnologyInstitute of Nuclear and Physical EngineeringIlkovicova 3Bratislava 81219Slovakia Chinese Academy of Sciences Institute of Modern PhysicsLanzhou 730000China Slovak University of Technology Faculty of Materials Science and TechnologyAdvanced Technologies Research InstituteJana Bottu 2781/25Trnava 91724Slovakia Universität der Bundeswehr München Institut für Angewandte Physik und Messtechnik LRT2Werner-Heisenberg-Weg 39Neubiberg85577Germany Southwest University of Science and Technology State Key Laboratory for Environment-friendly Energy MaterialsMianyangSichuan 621010China Texas A&M University Nuclear Engineering DepartmentCollege StationTX 77843USA Radiation Effects Consulting LLC Richland WA 99354USA

The development of structural materials resistant to harsh radiation environments requires an in-depth understanding of the early stage of the aging *** radiation environments with high transmutation helium production rates such as in fusion and spallation applications,even materials with otherwise acceptable radiation stability may suffer from radiation embrittlement related to helium bubble *** theoretical modeling of helium-assisted cavity nucleation in pure metals and simple alloys provides some useful guidelines at the atomic scale level,these,however,do not overlap with the size resolution of available experimental *** this study,we employed slow positron beam spectroscopy to characterize the nucleation and growth of nano-scale helium bubbles in martensitic steels strengthened by thermodynamically stable nano-oxide *** combination with transmission electron microscopy,we experimentally characterized the evolution of helium bubbles from small clusters of radiation-induced vacancies to large cavities well resolvable by *** radiation resistance of oxide-dispersion strengthened steels dominates only in the early stages of bubble evolution,where positron lifetime measurements provide a missing piece of the microstructural puzzle conventionally constructed by TEM.

关键词： Ion irradiation Bubble swelling Helium Positron annihilation spectroscopy Oxide dispersion strengthened steels

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

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：