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E-Tendering Process Within Construction:A UK Perspective

Tsinghua Science and Technology 2008年第S1期13卷 273-278页

作者： Geoff Tindsley Paul stephenson Division of Built Environment Faculty of Development and Society Sheffield Hallam University

E-tendering can be defined as the issue and receipt of tender documentation through electronic means which facilitates the procurement of construction work and the award of contracts. The current paper-based method of tendering has been commonplace within the industry for a significant number of years, but with recent technological advancements, this traditional process is rapidly becoming outdated. Several major projects within the UK are now being procured through the e-tendering process which includes the multibillion pound development for the Olympic Games in London 2012. However, while these prestigious projects are embracing e-tendering technology, it is not certain as to what extent e-tendering is used across the construction sector generally. This research is primarily concerned with establishing the current status, practicalities and resource effectiveness of e-tendering within UK construction. Results are provided from an in-dustry survey which includes both quantitative and qualitative data. A case study implementation is also in-cluded which assesses the utilisation of e-tendering software in practice. The research findings indicated that e-tendering can provide substantial resource savings to a major part of the supply chain, with the key benefits being enhanced communication, time savings and reduced costs. However, a considerable proportion of the industry remains uncertain about embracing new technologies, with reluctance to change being perceived as the greatest barrier. The findings suggest that many professionals within the UK construction industry recognise a requirement for increased implementation of e-tendering, but feel that training, education and support from senior management are essential requirements for e-tendering to become widely accepted in the future.

关键词： construction project data electronic communications e-tendering

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Development of a brownfield inventory for prioritizing funding outreach in Tucson,Arizona

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Geo-Spatial Information Science 2021年第4期24卷 742-754页

作者： Theresa Foley Ann Marie Wolf Chloe Jackson rya. stephenson Sonora Environmental Research Institute Inc.(SERI)TucsonAZUSA Pima County ITD/GIS TucsonAZUSA Pima County Community Development&Neighborhood Conservation TucsonAZUS

Fear of liability from the 1980 Comprehensive Environmental Response,Compensation,and Liability Act(CERCLA or Superfund)has prompted developers to build preferentially upon undeveloped green space rather than potentially contaminated former industrial sites,leading to urban sprawl in the suburban areas while blighted properties in the urban core remain vacant.A brownfield is defined as a property in which the presence or potential presence of a hazardous substance or contaminant poses a barrier to *** often create brownfield inventories by performing a site suitability analysis,using distinguishing features such as ecolo-gically and culturally significant areas or neighborhoods that need *** County,Arizona and the Sonora Environmental Research Institute,Inc.(SERI)developed a brownfield inventory of the large,industrial area directly to the west of Davis-Monthan Air Force *** the brownfield target area has few residential neighborhoods and lacks the distinguish-ing features usually used in a brownfield site suitability analysis,the county and SERI used the official tax assessor database and 11 federal,state and county environmental databases to develop a brownfield *** goal of the project was to prioritize properties that stood to benefit from the grant *** final brownfield inventory contained 531 parcels.

关键词： GIS site suitability analysis brownfield urban planning brownfield inventory

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Effect of forest disturbance on myxomycete assemblages in the southwestern Peruvian Amazon

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Fungal Diversity 2013年第2期59卷 45-53页

作者： Carlos Rojas Steven L.stephenson Instituto de Investigaciones en Ingeniería and Escuela de Biología Universidad de Costa RicaSan Pedro de Montes de Oca 11501-2060Costa Rica Department of Biological Sciences University of ArkansasFayettevilleAR 72701-1201USA

Although the effects of microenvironmental factors on distribution patterns in myxomycetes have been investigated,studies of the responses of this group of organisms to different regimes of forest disturbance are relatively few in *** an effort to understand the implications of forest fragmentation and habitat loss on myxomycetes,the project described herein was carried out at the Los Amigos Biological Station in southeastern *** structure and composition of assemblages of myxomycetes were investigated in relation to three different forest types and climatic periods in the area of *** analysis of the most commonly recorded substrates was carried out as *** results suggested that habitat loss,through differences in forest structure,was the factor determining most of the differences in fruiting body abundance of myxomycetes among forest *** addition,a switch in the ecological strategy of dispersal seemed to be an important factor accounting for differences in the fruiting body abundance and structure of assemblages of myxomycetes between collecting *** study provides evidence indicating that for microbial assemblages to maintain the balance of functional interactions within a particular forest ecosystem,the conservation of the forests themselves should be considered.

关键词： Biogeography Microbial ecology Mycetozoans Myxogastrids Restoration ecology

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The role of Ca,Al and Zn on room temperature ductility and grain boundary cohesion of magnesium

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Journal of Magnesium and Alloys 2021年第5期9卷 1536-1551页

作者： Supriya Nandy Shao-Pu Tsai Leigh stephenson Dierk Raabe Stefan Zaefferer Max-Planck Institut für Eisenforschung Düsseldorf 40237Germany

It is know from literature that small additions(<1 wt%)of Ca,Al and Zn significantly improve the intrinsic ductility of *** exact role of each element,both qualitatively and quantitatively,and their combined effects,however,are poorly *** we achieved a much clearer view on the quantitative role of each element with respect to ductility improvement and on the collaborative effect,particularly of Ca and Zn in *** of our findings and conclusions are in disagreement with data and interpretation found in *** different alloys,namely,Mg-0.1 Ca,Mg-0.1 Ca-1 Al,Mg-0.05 Ca-1 Al,Mg-0.1 Ca-2 Al-1 Zn(all are in wt%)were selected for this *** alloys were treated such that *** grain sizes and textures were *** largely excludes the effect of extrinsic factors on ***-guided slip trace analyses reveal that the addition of Ca eases activation of prismatic and pyramidal II slip *** in-situ deformation experiments in SEM and atom probe tomography observations of grain boundaries direct evidence is given for the individual and synergetic effects of Ca and Zn on grain boundary cohesion as an important contribution to improve the ductility of these *** conclude that Ca reduces the slip anisotropy and ameliorates ductility,however,the weak grain boundary cohesion in the Mg-0.1 wt%Ca alloy limits the material’s tensile *** addition of Zn alters the Ca segregation at the grain boundaries and helps to retain their cohesive strength,an effect which thus enables higher ductility and *** further addition of Al primarily improves the *** results show that the balanced influence of reduced slip anisotropy on the one hand and increased grain boundary cohesion on the other hand allow to design a high strength high ductility rare-earth free Mg alloy.

关键词： Magnesium–Calcium–Zinc alloys Ductility Slip system determination grain boundary cohesion

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Myxomycetes associated with grasslands of the western central United States

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Fungal Diversity 2013年第2期59卷 147-158页

作者： Adam W.Rollins Steven L.stephenson Department of Biology Lincoln Memorial UniversityHarrogateTN 37752USA Department of Biological Sciences University of ArkansasFayettevilleAR 72701USA

The assemblages of myxomycetes associated with the three types of temperate grasslands(tall grass,mixed grass and short grass)found across the western central United States were examined by collecting samples for isolation of these organisms from nine study *** consisted of two types of ground litter,two types of aerial litter(dead but still attached plant parts)and *** were brought back to the laboratory and used to prepare a series of moist chamber *** cultures yielded 1,301 collections of myxomycetes representing 59 species in 18 *** collections could be identified only to genus and one in particular(Lepidoderma sp.)appears to be an undescribed *** spectabile was recorded for the first time in North ***,only eight species(Badhamia melanospora,Didymium anellus,***,***,Perichaena depressa,Physarum cinereum,***,and Stemonitis fusca)were recovered from all nine study sites and thus are considered to represent a core component of the myxomycete biota of temperate grasslands.

关键词： Community ecology Ecological distribution Grasslands Microhabitat Myxogastrids

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The Serpent Column

The Serpent Column

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作者： stephenson Paul

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Myxomycete colonization on translocated and non-translocated dead leaves from temperate and tropical forests

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Studies in Fungi 2020年第1期5卷 462-470页

作者： Rojas C stephenson SL Rojas PA Finca Experimental Interdisciplinaria de Modelos Agroecológicos University of Costa RicaTurrialba30502-Costa Rica Engineering Research Institute University of Costa RicaSan Pedro de Montes de Oca11501-Costa Rica Department of Biological Sciences University of ArkansasFayettevilleAR 72701USA

Samples of dead leaves on the forest floor were collected from a locality in central Costa Rica and another locality in northwest Arkansas in the United States and then were placed in fine-mesh nylon bags,autoclaved and left out in the field for four *** of the bags prepared with sterile material from each country were placed out in the country where they were collected,and the other half were placed in the other country.A characterization of forest structure and ground leaf chemistry was carried out for both localities and both leaf *** recollected,all samples were processed for myxomycetes with the use of the moist chamber culture *** cultures yielded a total of 156 records of myxomycetes representing 16 species,but only 13 records and six species were isolated from the samples left out in Costa *** hundred percent of cultures placed out in Arkansas produced myxomycetes,whereas only 68%of those placed out in Costa Rica were positive for these *** in species richness and number of records were observed across forests where the samples were placed out,and no differences were observed based on the origin of the *** suggested that myxomycete colonization in the studied areas is primarily affected by the dynamics of the forest type and secondarily by substrate *** myxomycete species recorded on leaves with poorer chemical values are also consistent with field *** the present study,the more open character of the temperate forest in Arkansas without a film of water layer covering the leaves on the ground seemed to have played a role in the establishment of myxomycete propagules in the sterile material during the time of the investigation.

关键词： Arkansas Costa Rica myxogastrids Pea Ridge slime molds Turrialba

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Surgical management of non-syndromic ectopia lentis

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1156-1160页

作者： Kirk AJ stephenson Michael O’Keefe David J Keegan Retinal Research Group Mater Misericordiae University Hospital&Mater Private HospitalDublin 7Ireland

AIM:To compare whether aphakic contact lenses or secondary iris-claw intraocular lenses are superior in the refractive management post-pars plana vitreolensectomy in a pedigree with an FBN1 mutation causing non-syndromic ectopia lentis(NSEL)with retinal detachment(RD).METHODS:Eight affected individuals had pars plana vitreolensectomy for bilateral ectopia lentis(EL).Twelve eyes of 6 patients had secondary iris-claw intraocular lenses inserted and 4 eyes of 2 patients were managed with contact *** retinal detachment(RRD)was treated when ***-and post-operative assessment included visual acuity,endothelial cell count and dilated fundal ***:Macula-on RRD was present in all individuals>18 y,64%(7/11 eyes)presenting post-vitreolensectomy with 57%having bilateral non-synchronous *** aphakia was managed with iris-fixated intraocular lenses(IOL group,n=6),or contact lenses(CL group,n=2).Visual acuity≥0.3 log MAR(driving standard)was achieved in 75%of IOL group eyes and 25%of the CL group *** loss of corneal endothelial cell count in the IOL group was 4%at 2 y ***:In this cohort,refractive management with iris-claw IOLs provided superior outcomes to contact lenses and the authors recommend this as the optimal refractive correction in EL patients.

关键词： FBN1 isolated ectopia lentis retinal detachment iris-claw intraocular lenses

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Restoration of the Western Himalaya： implications for metamorphic protoliths, thrust and normal faulting, and channel flow models

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Episodes 2007年第4期30卷 242-257页

作者： Michael P. Searle Ben stephenson James Walker Christian Walker Dept. Earth Sciences Oxford University Parks Road Oxford OX1 3PR UK Shell Canada Energy 400 - 4th Ave. SW Calgary Alberta T2P 2H5 Canada Imperial Oil Resources ExxonMobil 237 4th Ave. SW Calgary Alberta T2P 3M9 Canada CHP Consulting London EC2N 2HA UK

The Greater Himalayan Sequence （GHS） is composed of a sequence of Barrovianfacies metamorphic rocks up to kyanite or sillimanite ＋ K-feldspar grade, migmatites, layered stromatic migmatites and leucogranite sheets. These rocks were metamorphosed during the late Eocene to early Miocene, and are bounded below by a large-scale SW-vergent ductile shear zone-thrust fault （Main Central Thrust; MCT）, and above by a NE-dipping low-angle normal sense shear zone and fault （Zanskar Shear Zone; ZSZ）,

关键词：变形原岩喜玛拉雅山断层作用地质模型

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The Uses and Benefits of Big Data for Geological Surveys

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Acta Geologica Sinica(English Edition) 2019年第S01期93卷 64-65页

作者： Michael H.stephenson British Geological Survey NottinghamNG125GGUK

’Long tail’data is the difficult-to-get-at data that sits in libraries,institutes and on the computers of individual *** specialists like to contrast it with the smaller number of large,more accessible data sets(*** et al.,2013).The name’long tail’derives from graphs drawn of the size of data sets against their number:there are relatively few large datasets and a lot of smaller ones.

关键词： long tail data informatics biostratigraphy geological survey

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