检索结果-南通市图书馆

Determining the influence of the physicochemical parameters of urban soils on As availability using chemometric methods：A preliminary study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2016年第9期28卷 183-192页

作者： christophe waterlot aurélie pelfrêne francis douay Civil and geo-Environmental Engineering Laboratory (LGCgE) ISA Lille 48 boulevard Vauban 59046 Lille cedex France

An initial exploration was conducted using mathematical and statistical methods to obtain relevant information about the determination of the physicochemical parameters capable of controlling As uptake by ryegrass grown on contaminated *** of As in the soils were from 10 to 47 mg/kg,mainly in the As（V） form（57%–73%）.Concentrations of As in water extracts were very low（61–700 μg/kg）.It was suggested that As（Ⅲ） was mainly in the uncharged species and As（V） in the charged *** methods revealed that the values of the ratio As（Ⅲ）/As（V） depended on the assimilated-phosphorus,the pseudo-total and water-extractable Fe contents and the soil p *** concentrations measured in ryegrass shoots ranged from 119 to 1602 μg/*** linear correlations were obtained between As in ryegrass shoots and water *** transfer coefficient of As correlated well with the ratio assimilated-phosphorus/***（Ⅲ）uptake by the shoot of ryegrass was controlled by the organic matter and Fe-oxide contents.

关键词： Arsenic Speciation Water extracting solution Phytoavailability Ryegrass Contaminated urban soils

Is the expansion of the pine processionary moth, due to global warming, impacting the endangered Spanish moon moth through an induced change in food quality?

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2012年第2期7卷 147-157页

作者： Charles-Edouard IMBERT francis GOUSSARD Alain ROQUES Forest Ecology INRAOrleansFrance

Recent climate change is known to affect the distribution of a number of insect species,resulting in a modification of their range *** newly colonized areas,novel interactions become apparent between expanding and endemic species sharing the same *** pine processionary moth is a highly damaging pine defoliator,extending its range northwards and upwards in response to winter *** expansion in the Alps has resulted in an invasion into the range of the Spanish moon moth,a red listed species developing on Scots *** processionary moth larvae develop during winter,preceding those of the moon moth,which hatch in late *** pine trees planted in a clonal design,we experimentally tested the effect of previous winter defoliation by pine processionary moth larvae upon the survival and development of moon moth *** on foliage of heavily defoliated trees(>50%)resulted in a significant increase in the development time of moon moth larvae and a decrease in relative growth rate compared to feeding on foliage of undefoliated *** weight of pupae also decreased when larvae were fed with foliage of defoliated trees,and might,therefore,affect imago perfor***,lower defoliation degrees did not result in significant differences in larval performances compared to the *** a high degree of defoliation by pine processionary moth is to be expected during the colonization phase,its arrival in subalpine pine stands might affect the populations of the endangered moon moth .

关键词： Actias isabellae climate change competition conservation expansion Pinus Thaumetopoea pityocampa

Chemical Availability of Cd, Pb and Zn in Anthropogenically Polluted Soil: Assessing the Geochemical Reactivity and Oral Bioaccessibility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2017年第3期27卷 616-629页

作者： Christophe WATERLOT francis DOUAY Aurélie PELFRENE Yncréa Hauts-de-France Laboratoire Génie Civil et géo Environnement (LGCgE)

The most recent in vitro tests used to determine metal bioaccessiblility are generally time-consuming and expensive. This study aimed at determining potential relationships between the concentrations of metals extracted using single-extraction methods and the concentrations of bioaccessible metals assessed by a harmonised in vitro test, the Unified BARGE Method （UBM）. A total number of 27 soil samples were collected from kitchen gardens and lawns with various physicochemical parameters and contamination levels. Significant relationships were obtained between Cd, Pb and Zn extracted in gastric and gastrointestinal phases and using single extractions. The best relationhips were established using acetic and citric acids for Cd, whereas for Pb, citric acid and ethylenedi- aminetetraacetic acid （EDTA） were identified as the best extractants. These relationships were improved by means of a linear multiple regression with a downward stepwise procedure involving agronomic parameters （soil cation exchange capacity and assimilated P）. This method highlighted the fact that the cation exchange capacity and P contents in soils were the two main parameters that controlled the human bioaccessibility of Cd, Pb and Zn in the gastric phase. Besides, the metal concentrations extracted with the acetic and citric acids correlated well with the metal concentrations in the gastric and gastrointestinal phases, suggesting that the bioaceessible metals were mainly in a soluble form, weakly bound to the organic matter and associated with the carbonates and the Fe and Mn oxides/hydroxides in soils.

关键词： gastric phase gastrointestinal phase linear multiple regression single extractant urban soil

在线全文

学校读者我要写书评

暂无评论

Of Fame （unfinished）

中国翻译 2013年第3期34卷 115-116页

作者： francis Bacon

Stationary phase and practical numerical evaluation of ship waves in shallow water

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 Hydrodynamics 2017年第5期29卷 817-824页

作者：张晨亮王金宝朱怡 francis Noblesse Marine Design and Research Institute of China Shanghai 20011China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

A simple and highly-efficient method for numerically evaluating the waves created by a ship that travels at a constant speed in calm water, of large depth or of uniform depth, is given. The method, inspired by Kelvin＇s classical stationary-phase analysis, is suited for evaluating far-field as well as near-field waves. More generally, the method can be applied to a broad class of integrals with integrands that contain a rapidly oscillatory trigonometric function with a phase function whose first derivative（and possibly also higher derivatives） vanishes at one or several points, commonly called points of stationary phase, with the range of integration.

关键词： Ship waves fourier integral numerical evaluation stationary phase

A field parcel-oriented approach to evaluate the crop cover-management factor and time-distributed erosion risk in Europe

在线全文

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2023年第1期11卷 43-59页

作者： francis Matthews Gert Verstraeten Pasquale Borrelli Panos Panagos European Commission Joint Research Centre(JRC)IspraItaly Department of Earth and Environmental Sciences KU LeuvenBelgium Department of Science Roma Tre University00146RomeItaly

The crop cover-management(C-)factor in arable landscapes describes the soil erosion susceptibility associated with seasonally cultivated *** informatic and computational limitations have led many modelling studies to prescribe C-factor values and assume spatial and temporal ***,the multiple influencing factors ranging from parcel-scale crop cultivation and management to regional-scale rainfall regimes motivates new methods to capture this variation when identifying at-risk ***,we define a multi-component method to derive the C-factor by associating time series of canopy and residue surface cover from Sentinel-2 and climate-specific rainfall erosivity with Integrated Administration and Control System(IACS)field parcel data from European Union member states.A scalable and standardised method is emphasised to increase the future interoperability and inter-comparability of soil erosion modelling studies deploying the ***,field parcel simu-lation units with associated crop declarations provide a new reference scale to link predictions of soil erosion risk with specific management decisions and declarations by *** implementing the method on a homogenised subsample of 8600 field parcels covering available IACS regions,several key findings are outlined:1)time series information provides new opportunities to predict the time-criticality of erosion in specific crop cultivations,2)the varying(a-)synchronicity between seasonal crop canopy cover and heavy rainstorms means that spatial variability is inherent within the C-factor across Europe,and 3)the addition of agricultural management practices(*** practice de-scriptions)to open-access IACS repositories can facilitate more comprehensive evaluations of the C-factor and soil erosion risk.

关键词： C-factor Soil erosion Modelling Remote sensing Crop-phenology IACS data Soil conservation Europe

Towards a Unified Framework of Syntax, Semantics and Logic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中山大学学报（社会科学版） 2003年第S1期43卷 20-33页

作者： francis Yunqing Lin St Hugh's College University of Oxford & Department of Computing Goldsmiths College University of London

1. IntroductionHumans have the ability (or competence) to think logically, and this is an undeniable fact. However,what this ability consists in is a difficult question. It might be said that logical ability consists ... 详细信息

关键词： of work on it as that Semantics and Logic Towards a Unified Framework of Syntax

Organ transplantation in China——the 21st century

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2012年第4期11卷 346-348页

作者： francis L Delmonico Department of Surgery Massachusetts General HospitalHarvard UniversityBostonMassachusettsUSA

Introduction China has emerged as an economic power internationally and it now naturally seeks to influence the conduct of medical affairsto improve the condition of the Chinese people;

关键词： the 21st century Organ transplantation in China

Wittgenstein on Reading

在线全文

学校读者我要写书评

暂无评论

Frontiers of Philosophy in China 2021年第1期16卷 67-85页

作者： francis Yunqing LIN School of English Beijing International Studies UniversityBeijing 100024China

The section on reading occupies quite a large amount of space in the Philosophical Investigations(PI)and Wittgenstein makes little changes to it in the course of composing the *** shows that the section on reading is *** paper analyzes Wittgenstein’s treatment of the philosophical problem of reading in *** shows that Wittgenstein rejects six philosophical ideas about what reading is and employs three different *** paper also shows that the section on reading is not only important for grasping Wittgenstein’s discussion on understanding,but also for comprehending the whole of PI.

关键词： reading understanding family-resemblance word use philosophical problem dissolution