检索结果-南通市图书馆

维普期刊数据库

MECHANICAL PERFORMANCE OF LIME-CEMENT MORTAR FOR STRAW-BALE CONSTRUCTION

在线全文

学校读者我要写书评

暂无评论

Journal of Green Building 2014年第3期9卷 100-115页

作者： colin MacDougall Dr.Stephen Vardy Department of Civil Engineering Queen’s UniversityKingstonOntarioCanadaK7L3N6 Ottawa OntarioCanadaK1V6E1613-983-2761

Experimental data describing the mechanical performance of Portland cement-hydrated lime mortars used for straw bale construction is *** bale construction uses stacked straw bales plastered on each side to form load-bearing *** used have slumps of approximately 50 mm,compared to slumps up to 279 mm for conventional masonry *** and cube tests of a range of typical straw bale mortar mixes were carried *** mortars had compressive strengths ranging between 0.3 MPa and 13 *** equations describing the relationships between compressive strength and curing time,w/cm ratio,proportions of lime,cement and sand,and modulus of elasticity are *** data show that cement-lime mortars for straw bale construction will have a higher modulus of elasticity and lower failure strain than a conventional mortar of equivalent compressive *** Modulus of Elasticity is on average 818 times the compressive strength of a straw bale mortar,compared to 100 to 200 times as reported in the literature for conventional *** average failure strain for straw bale mortar is 0.00253 compared to 0.0087 to 0.0270 reported in the literature for conventional mortar.

关键词： Straw-bale construction mortar cement hydrated lime compressive strength constitutive model

The k-Nacci Sequences in Some Special Modular Groups

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Algebra Colloquium 2014年第1期21卷 59-66页

作者： Omur Deveci colin M. Campbell Department of Mathematics Faculty of Science and Letters Katlms University 36100 Kars Turkey School of Mathematics and Statistics -University of St Andrews North Haugb St Andrews Fife KY16 9SS Scotland

A k-nacci （k-step Fibonacci） sequence in a finite group is a sequence of group elements x0,x1,x2,...,xn,.., for which, given an initial （seed） set x0,x1,x2,...,xj-1, each element is defined by xn{x0x1…xn-1 forj≤n〈k xn-kxn-k＋1 …xn-1 for n≥kFrom the definition, it is clear that the period of the k-nacci sequence in a group depends on the chosen generating set and the order in which the assignments of x0, x1, x2,…~, xj-1 are made. In this paper we examine the periods of the k-nacci sequences in the groups m2, m2＋ and R2, where each term of the sequence is reduced modulo 2.

关键词： k-nacci sequence period modular group

Feature weighted clustering for user profiling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2017年第4期8卷 245-261页

作者： Ayse Cufoglu Mahi Lohi colin Everiss Department of Engineering University of Westminster 309 Regent StreetW1B 2HWLondonUK Department of Computer Science University of Westminster 309 Regent StreetW1B 2HWLondonUK

Personalization is the adaptation of the services to fit the user’s interests,characteristics and *** key to effective personalization is user *** from traditional collaborative and content-based approaches,a number of classification and clustering algorithms have been used to classify user related information to create user ***,they are not able to achieve accurate user *** this paper,we present a new clustering algorithm,namely Multi-Dimensional Clustering(MDC),to determine user *** MDC is a version of the Instance-Based Learner(IBL)algorithm that assigns weights to feature values and considers these weights for the *** feature weight methods are proposed for the MDC and,all three,have been tested and *** were conducted with using two sets of user profile datasets,which are the training(includes 10,000 instances)and test(includes 1000 instances)*** datasets reflect each user’s personal information,preferences and *** simulations and comparisons with existing weighted and non-weighted instance-based algorithms were carried out in order to demonstrate the performance of proposed *** results using the user profile datasets demonstrate that the proposed algorithm has better clustering accuracy performance compared to other *** work is based on the doctoral thesis of the corresponding author.

关键词： Classification clustering mining methods and algorithms user profiling and personalization

Non-surgical factors influencing lymph node yield in colon cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2016年第5期8卷 466-473页

作者： Patrick Wood colin Peirce Jurgen Mulsow Department of Colorectal Surgery Mater Misericordiae University Hospital

There are numerous factors which can affect the lymph node(LN) yield in colon cancer *** aim of this paper was to identify both modifiable and nonmodifiable factors that have been demonstrated toaffect colonic resection specimen LN yield and to summarise the pertinent literature on these topics.A literature review of Pub Med was performed to identify the potential factors which may influence the LN yield in colon cancer resection *** terms used for the search were:LN,lymphadenectomy,LN yield,LN harvest,LN number,colon cancer and colorectal *** nonmodifiable and modifiable factors were *** review identified fifteen non-surgical factors:(13 nonmodifiable,2 modifiable) which may influence LN *** yield is frequently reduced in older,obese patients and those with male sex and increased in patients with right sided,large,and poorly differentiated *** ethnicity and lower socioeconomic class may negatively influence LN ***-operative tumour tattooing appears to increase LN *** are many factors that potentially influence the LN yield,although the strength of the association between the two varies *** oncological resection and pathological analysis remain the cornerstones to achieving good quality and quantity LN yields in patients with colon cancer.

关键词： Lymph node Number Factors Yield Colon cancer

CLE and RGF Family Peptide Hormone Signaling in Plant Development

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2012年第6期5卷 1173-1175页

作者： colin D. Leasure Zheng-Hui He Department of Biology 1600 Holloway Avenue San Francisco State University San Francisco CA 94132 USA

Since the discovery of Systemin in tomatoes in 1991, many additional peptide hormones have been discovered in plants. Plant peptide hormones typically start as small precursor pro- teins （-100a.a.）, which include N-terminal secretory or anchor sequences, and are post-translationally processed into a smaller hormonally active peptide （on the range of 5-18 a.a.）. To date, peptide hormones have been shown to have diverse functions in plants, including nearly every aspect of develop- ment and morphogenesis. Here, we discuss recent reports regarding the CLV3/ESR-RELATED （CLE） and ROOT GROWTH FACTOR （RGF） families of peptide hormones.

关键词：

THERMAL PERFORMANCE OF PANELS WITH HIGH DENSITY,RANDOMLY ORIENTED STRAW BALES

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 Green Building 2018年第1期13卷 31-55页

作者： Sarah Seitz Kyle Beaudry colin MacDougall Dept.of Civil Engineering Queen’s UniversityKingstonOntarioCanada

This paper describes the hot-box testing(based on ASTM C1363-11)of seven straw bale wall panels to obtain their thermal conductivity *** panels were con-structed with stacked bales and cement-lime plaster skins on each side of the *** panels were made with traditional,2-string field bales of densities ranging from 89.5 kg/m^(3)-131 kg/m^(3) and with the bales on-edge(fibres perpendicular to the heat flow).Three panels were made with manufactured high-density bales(291 kg/m^(3)-372 kg/m^(3)).The fibres of the manufactured bales were randomly *** key conclusion of this paper is that within the experimental error,there is no difference in the thermal conductivity value for panels using normal density bales and manufactured high density bales up to a density of 333 kg/m^(3).However,because of lack of precision of the hot-box,no conclusions can be made on the true thermal conductivity of the high density bale *** addition,the panels tested were found to have significant voids between bales,and this is believed to have con-tributed to higher measured thermal conductivity values compared to those reported in the literature for normal density bale *** properties may be affected for bales with higher densities than 333 kg/m^(3),therefore further testing is suggested.

关键词： straw bale construction thermal testing thermal conductivity hot-box apparatus high-density bales

Ecological Status and Uses of Juniper Species in the Cold Desert Environment of the Lahaul Valley, North-western Himalaya, India

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 Mountain Science 2012年第5期9卷 676-686页

作者： Yashwant S.RAWAT colin S.EVERSON School of Agricultural Earth and Environmental SciencesUniversity of KwaZulu-Natal

The juniper species Juniperus polycarpos C. Koch, J. indica Bertol. and J. communis L. var. saxatilis （Pallas） are important elements of the forest vegetation in Lahaul valley in the north-western Himalaya. Their ability to grow under the barren and xeric conditions of cold deserts makes them particularly suited for afforestation programmes under these eeologieal conditions. In the Lahaul valley, juniper species are used as subsistence resources and for religious purposes. Excessive removal of juniper wood and leaves by the local population, overgrazing, habitat fragmentation and low regeneration potential are the main obstacles to eonservation of juniper forests in this region. The present study was carried out to assess density, basal area and importance value index （WI） of the local vegetation as well as uses and amounts of juniper wood and leaves removed from the local forests. Pressure on relict juniper forests due to grazing animals and intensive removal of wood and leaves by the loeal population was found to be greater at an altitude above 3,00o m. The results of the study demonstrated that the different juniper speeies were adapted to specific altitude ranges. A higher species density was recorded at lower altitude except for J. indica which was only present at high altitude （〉3,200 m） on south-facing slopes. Density, basal area and IVI of J. polycarpos were higher at Hinsa （2,7oo m） than at Jahlma （3,000 m）. The rapid loss of vegetation due to overuse and habitat degradation has made the eonservation of juniper forests an important priority in the Lahaul valley. J. polycarpos at loweraltitude and J. indica at higher altitude are ecologically the more suitable species for the successful implementation of conservation programmes. The support of rehabilitation programmes by regional authorities is essential for the reestablishment of the local juniper forests.

关键词： Juniper Distribution Utilization Pattern Agroforestry Forest Conservation

维普期刊数据库

Improved bridge pier collar for reducing scour

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2022年第1期37卷 37-46页

作者： Christopher Valela colin David Rennie Ioan Nistor Department of Civil Engineering University of Ottawa

This study performed a bridge pier collar comparison for the purpose of reducing scour,while introducing a new collar *** new collar,referred to as Collar Prototype Number 3,was designed based on an equilibrium scour hole and provides a method of controlling the horseshoe *** modelling was utilized to show the flow field and bed shear stress as a result of using Collar Prototype Number 3.A prototype model of Collar Prototype Number 3 and a flat plate collar were constructed for the purpose of comparing both experimentally under different flow *** Prototype Number 3 proved to be an effective device as it reduced scour in terms of the maximum depth downstream of the pier and overall volume,in some instances,by up to 69.7%and 75.7%,***,Collar Prototype Number 3 outperformed the flat plate collar,especially because,unlike the flat plate collar,Collar Prototype Number 3 did not experience undermining.

关键词： Bridge pier Scour Horseshoe vortex Pier collar Scour countermeasure

Availability and Use of Willow Species in Representative Cold Desert Areas of Northwestern Himalaya,India

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2013年第3期10卷 472-481页

作者： Yashwant S.RAWAT colin S.EVERSON Centre for Water Resources Research School of AgriculturalEarth and Environmental SciencesUniversity of KwaZuluNatal

Willow species （Salix fragilis L. and S. alba L.） are important elements of cold desert agroforestry systems in the Lahaul valley, north- western Himalaya. Their ability to grow through shoot-cuttings plantations under extreme and xeric climatic conditions of cold deserts, makes them ecologically suited and socially accepted for forestry programmes. Willow species in cold deserts may combat desertification and can thrive well in these areas as compared to any other species. Salixfragilis L. and S. alba L. are under cultivation in the Lahaul valley. However, S. fragilis is widely cultivated under the agroforestry and plantation forestry systems. In the Lahaul valley, willow species are used as subsistence resources and for socio-religious purposes. The present study was carried out to examine the vegetation analysis, density, diversity and distribution of willow species, present status and potential willow plantation sites and uses. The results of present study revealed that a higher species density was recorded at middle altitude villages （Jahlma-3,ooo m asl and Hinsa-2,7oo m asl）, except, a higher density of S. fragilis was at Khoksar （3,200 m asl） in plantation forestry on south-facing slopes. In forests, S. fragilis was planted mainly along the water channels, resulted a low density. The shrubby willow species occurred naturally in the entire Lahaul valley up to an altitude of 3,850 m asl. 81% of households felt the scarcity of willow trees, whereas, 19% of households were satisfied with the willow trees they owned. The majority of willow species were planted in middle altitudes on privately owned irrigated lands. It was rated most potential prospective willow planting siteby the farmers. Small size of land-holdings was one of the main constraints for establishing a large number of willow plantations. Commercial aspects of willow species need to be investigated to encourage the farmers to plant more willows further.

关键词： Willow Agroforestry Forestry Speciesdiversity Himalaya

维普期刊数据库