检索结果-南通市图书馆

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空中英语教室（高级版．彭蒙惠英语） 2024年第1期 1-1页

作者： peter B.Brown 不详

Dearreaders,Happy New Year!It is the beginning of the year *** you or someone you know will use this time to develop a new habit or behavior to improve your life-a"New Year's resolution,"as they *** you can simply loo... 详细信息

关键词： someone plenty YOUR

Conserving our global botanical heritage:The PSESP plant conservation program

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Plant Diversity 2020年第4期42卷 319-322页

作者： peter Crane Oak Spring Garden Foundation 1776 Loughborough LaneUppervilleVA20184USA School of Forestry and Environmental Studies Yale UniversityNew HavenCT06511USA

It is a fundamental truth of ecology that most species are *** this rarity extends beyondmeasures of abundance to geographic *** a global context,very few species are truly abundant,and most are more or less restricted *** the world of plants,where there are several hundred thousand species,the number of species with especially small population sizes and small fragmentary ranges is extremely *** recent assessment,the most exhaustive undertaken so far,based on 200 million observations taken from herbarium records,ecological surveys and other sources,suggests that of the more than 400,000 species of land plants,ca.36%are“exceedingly rare”(Enquist et al.,2019).

关键词： Plants Conservation Paleobotany PSESP program

Hypervelocity Impacts and Exposed Lithospheric Mantle: A Way to Recognize Large Terrestrial Impact Basins?

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Journal of Earth Science 2019年第3期30卷 451-459页

作者： peter Olds Chemistry Faculty College of Alameda

On the Moon and Mars olivine of probable mantle origin is detected at rims of large Late Heavy Bombardment(LHB) age impact basins for which excavation depth estimates exceed crustal thickness estimates. But lunar Crisium size impact basins are not recognized on Earth nor expected in the Phanerozoic from conventional interpretations of crater size frequency distributions. In this study several large circular to elliptical basin structures on Earth, for which hypothesized impact excavation depth would greatly exceed crustal thickness, are examined for the presence of exposed lithospheric mantle, expressed as ophiolite, at the rims. Three Phanerozoic impact basins, modified by plate tectonics and tentatively correlated with "ophiolite obduction" plus global extinction events, are proposed here. These tentatively suggested Phanerozoic impact basins are:(1) Yucatan Basin/Puerto Rico Trench with a Greater Antilles ophiolite rim. Cretaceous-Paleogene Boundary global extinction may correlate with Maastrichtian ophiolite obduction in Southeast Cuba.(2) Loyalty Basin with a New Caledonia ophiolite plus d’Entrecasteaux Ridge rim. Late Eocene global extinction may correlate with obduction of the New Caledonia Peridotite Nappe.(3) Sulu Sea Basin with a Palawan, Sabah etc. ophiolite rim. The Middle Miocene Disruption Event may correlate with ophiolite obduction plus ophiolitic mélange emplacement in Sabah and in Palawan. These originally circular to elliptical belts of exposed lithospheric mantle may serve as strain markers for relative plate motions in the vicinity of plate boundaries during post-impact geologic times. It is further speculated that plate boundaries may be initiated and/or modified by such impacts.

关键词： olivine mantle impact basin ophiolite obduction mass extinction

Diapause induction and termination in a commonly univoltine leaf beetle （ Phratora vulgatissima）

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Insect Science 2011年第4期18卷 443-450页

作者： peter Dalin Department of Ecology Swedish University of Agricultural Sciences Uppsela Sweden

TheleafbeetlePhratoravulgatissima（Linnaeus 1758）iscommonlyunivoltine in south-central Sweden but may sometimes initiate a partial second generation. The current study was set out to investigate under what abiotic conditions the beetles initiate a second generation. Using climate chamber experiments, the beetles were shown to have a facultative reproductive diapause induced by declining day-length. The critical day-length （CDL） for diapause induction was estimated to be 18 h and 10 min. In the field, firstgeneration beetles developing to adulthood before August in 2009 became reproductively active and produced a second generation, but most individuals emerged later and were in reproductive diapause. P vulgatissima overwinter as adults and diapause was shown to be maintained until mid-winter in 2008/2009. The cumulative temperature requirement for oviposition after diapause termination was estimated to be 222 day-degrees with a 5.5℃ temperature threshold. Three different day-degree models that were developed to predict the phenology of female oviposition in the spring were validated by comparing model results with field data on the timing of oviposition in previous years. The study suggests that P vulgatissima may initiate a second generation in Sweden if development of the first generation is completed before August. Warmer spring and summer temperatures due to ongoing climate change may cause advanced insect phenology and faster completion of insect life-cycles at northern latitudes, which will affect the proportion of insects that initiate a second generation.

关键词： climate change diapause insect pests population dynamics seasonal adaptations voltinism

Genetic climatic regionalization of the Balkan Peninsula using cluster analysis

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Journal of Geographical Sciences 2017年第1期27卷 43-61页

作者： peter NOJAROV National Institute of Geophysics Geodesy and Geography Bulgarian Academy of Sciences Akad. G. BonchevStr. BI.3 Room 327 1113 Sofia Bulgaria

Sea Level Pressure（SLP） data for the period 1950–2012 at 61 stations located in or around the Balkan Peninsula was used. The main concept is that intra-annual course of SLP represents the best different air masses that are situated over the Balkan Peninsula during the year. The method for differentiation of climatic zones is cluster analysis. A hierarchical clustering technique–average linkage between groups with Pearson correlation for measurement of intervals was employed in the research. The climate of the Balkan Peninsula is transitional between oceanic and continental and also between subtropical and temperate climates. Several major changes in atmospheric circulation over the Balkan Peninsula have happened over the period 1950–2012. There is a serious increase of the influence of the Azores High in the period January–Marchwhich leads to an increase of SLP and enhances oceanic influence. There is an increase of the influence of the north-west extension of the monsoonal low in the period June–September. This leads to more continental climatebut also to more tropical air masses over the Balkan Peninsula. Accordinglythe extent of subtropical climate widens in northern direction. There is an increase of the influence of the Siberian High in the period October–December. This influence covers central and eastern part of the peninsula in October and Novemberand it reaches western parts in December. Thusthe climate becomes more continental.

关键词： genetic classification regionalization Balkan Peninsula cluster analysis Sea Level Pressure circulation indices

Spatially enabling Australia-the next decade

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International Journal of Digital Earth 2010年第1期3卷 91-107页

作者： peter Woodgate Australian Cooperative Research Centre for Spatial Information 723 Swanston StreetUniversity of MelbourneMelbourneVIC 3010Australia

A strategy for the development of the Australian spatial information industry called‘Spatially Enabling Australia’has recently been developed by the Cooperative Research Centre for Spatial *** comprises three fundamental research programs and an integrated applications *** Program 1,‘Positioning,’underpins a full framework of continuous operating reference stations to ultimately enable all of continental Australia to be capable of realtime precise positioning services based on global navigation satellite *** Program 2,‘Automated Spatial Information Generation,’addresses complex processing of multiple remote sensing *** Program 3,‘Spatial Infrastructures,’helps form the foundation for development of an Australian Spatial Marketplace that will make accessible vast amounts of government held data under a new licensing and access regime which supports combination with user-generated content from the mass *** three core programs are integrated with Program 4,‘Applications,’to support users from the Health,Defense and Security,Energy and Utilities,Urban Development,and Agriculture-Natural Resources-Climate Change *** 4 drives outputs from the three core research programs in sector-specific deployments for high *** will see a rapid acceleration of the use and value adding of information products and services that utilize spatial *** are considerable research and development challenges that must be met in order to achieve the strategic outcomes.

关键词： Australia spatial information positioning marketplace research

Generic principles of crack-healing ceramics

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Journal of Advanced Ceramics 2012年第4期1卷 249-267页

作者： peter GREIL Department of Materials Science(Glass and Ceramics) University of Erlangen-NuernbergMartensstr.5Erlangen 91058Germany

Ceramic materials able to heal manufacture or damage induced microstructure defects might trigger a change in paradigm for design and application of load bearing *** work reviews thermodynamic and kinetic aspects governing the regeneration of solid contact able to transfer stress between disrupted crack surfaces in *** crack healing processes include perturbation of crack-like pores followed by sintering of isolated pores,as well as reaction with an environmental atmosphere and filling of the crack space with an oxidation *** thermally activated solid state reactions require elevated temperatures which may exceed 1000℃,processes able to trigger crack healing at lower temperatures are of particular interest for transferring into engineering *** principles of microstructure modifications able to facilitate crack repair at lower temperatures will be considered:(i)acceleration of material transport by grain boundary decoration and grain size reduction,and(ii)reduction of thermal activation barrier by repair filler *** demonstrating crack healing capability include oxidation reaction of low energy bonded intercalation metal from nano-laminate MAX phases and catalyzed surface nitridation of polymer derived ceramics containing repair fillers.

关键词： crack healing microstructure modifications oxidation healing MAX phases preceramic polymers

Nonlocal Nonlinear Advection-Diffusion Equations

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Chinese Annals of Mathematics,Series B 2017年第1期38卷 281-292页

作者： peter CONSTANTIN Department of Mathematics Princeton UniversityPrincetonNJ 08544USA.

The author reviews some results about nonlocal advection-diffusion equations based on lower bounds for the fractional Laplacian.

关键词： Nonlocal Advection Diffusion Fractional Laplacian

Technology Provides Better Document Search Results on Slovak Legislation Webpage as Result of a Simulation of Webpage Performance Parameters

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Computers, Materials & Continua 2021年第4期67卷 159-170页

作者： peter Kvasnica Ministry of Justice of the Slovak Republic Bratislava81311Slovak Republic

This article acquaints the public with the insights gained from conducting document searches in the Slovak public administration information system,when supported by knowledge of its ***,it discusses the advantages of simulating performance parameters and comparing the obtained results with the real parameters of the eZbierka(eCollection)legislation *** comparison was based upon simulated results,obtained through the Gatling simulation tool,versus those obtained from measuring the properties of the public administration legislation *** sets of data(simulated and real),were generated via the the document search technologies in place on the eZbierka legislation *** webpage provides users with binding laws and bylaws available in an electronically signed PDF file *** is free open *** order to simulate the accessing of documents on the webpage,the Gatling simulation tool was *** tool simulated the activity,performed in the background of the information system,as a user attempted to read the data via the steps mentioned in the *** settings of the simulated environment corresponded as much as possible to the hardware parameters and network infrastructure properties used for the operation of the respective information *** on this data,through load changing,we determined the number of users,the response time to queries,and their number;these parameters define the throughput of the server of the legislation *** required parameter determination and performance of search technology operations are confirmed by a suitable hardware design and the webpage property parameter *** used the data from the eZbierka legislation webpage from its operational period of January 2016 to January 2019 for comparison,and analysed the relevant data to determine the parameter values of the legislation webpage of the slov-lex information *** basic elements of the design solution include the tech

关键词： Legislation webpage simulation tool search tool performance testing