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Durability Properties of Materials and Mixture Composition of Bitumen Stabilized Materials

作者： william j. jenkins

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武汉理工大学学报 2010年第17期32卷 215-226页

作者： TWAGIRA M E jenkins j.K Dept of Civil Engineering Stellenbosch University

Bitumen Stabilized Materials (BSMs) are widely recognized as environmentally friendly through significantly reduced energy consumption,reduced emissions and reuse of high percentage of RAP and recycled pavement materials. In order for these materials to be cost effective,their life-cycle performance needs to be proven. Durability of BSMs is a long-term phenomena that requires consideration during mix design. Time is very important variable for performance consideration under field conditions. The factors that influence durability and long-term performance of BSMs include the mineral aggregates,binder and mixture compositions. In this study,the important,but less understood aspects of durability properties of BSMs were investigated. These include wear and tear of mineral aggregates,age-hardening of binder (foamed bitumen and bitumen emulsion) and moisture susceptibility of typical mix composition. The wear and tear was investigated using Durability Mill Index (DMI) test,binder ageing was investigated for short and long-term effect,and moisture susceptibility was investigated by pulsing water pressures using new device i.e. moisture induction simulation test (MIST). The accelerated moisture conditioning simulates field conditions whereafter retained shear properties are evaluated. The results found that durability of mineral aggregates is significantly influences by the type and nature of mineral composition. The ageing of binder occurred in both short and long-term conditions,with short-term effects being dominating the foamed bitumen properties during laboratory production. Moisture susceptibility is significantly influenced by the mix compositions of aggregates blends with and without RAP,with different bitumen binder types (foamed bitumen or bitumen emulsion) and active filler type (cement or lime) and contents. The evaluation and ranking of mixes which are resistant and susceptible to moisture damage was done using retained cohesion (RC) after dry and wet monoton

关键词： durability properties bitumen stabilized materials moisture susceptibility ageing

Organizational Leadership in a Postmodern World： Practical Implications for Contemporary Religious Leaders

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j.urnalism and Mass Communication 2012年第12期2卷 1139-1148页

作者： j. j.cob jenkins California State University Channel Islands Camarillo USA

We live in an increasingly postmodern society. American Christianity, however, is imbued in a modem---even pre-modern--paradigm. As a result, many contemporary religious leaders find it difficult to communicate with their postmodern constituents, as evidenced by declining attendance rates and religious affiliation. The present study explores this dilemma by offering potential implications for contemporary religious leaders to communicate more effectively with emerging/emergent generation（s）. The author begins this exploration, first, by outlining the philosophical tenants of postmodemism： its epistemological, ontological, and axiological assumptions. Second, the author delineates several key characteristics of postmodern religious communication. Next, the author offers three practical implications for organizational leaders：（1） increased use of personal narrative, （2） removal of hierarchal boundary structures, and （3） increased awareness and appreciation for divergent perspectives. The author concludes this study with directions for future research.

关键词： postmodernism organizational leadership narrative paradigm communication privacy management(CPM) theory coordinated management of meaning (CMM)

An assessment of African lion Panthera leo sociality via social network analysis： prerelease monitoring for an ex situ reintroduction program

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Current Zoology 2017年第3期63卷 301-311页

作者： Emma j. DUNSTON j.ckie ABEL Rebecca E. DOYLE j.cqui KIRK Victoria B. HILLEY Andrew FORSYTH Emma jenkins Rafael FREIRE School of Animal and Veterinary Sciences Charles Sturt University Wagga Wagga NSW 2678 Australia Social and Conservation Psycology Coventry University Coventry CV1 5FB UK African Lion & Environmental Research Trust Melrose Farm Livingstone 23345 Zambia Animal Welfare Science Centre The University of Melbourne Parkville Victoria 3010 Australia African Lion & Environmental Research Trust Antelope Park Gweru Midlands Zimbabwe Siyafunda The Greater Makalali Private Game Reserve Harmony 27 Hoedspruit 0895 South Africa

The wild population of the African lion Panthera leo continues to decline, requiring alternate conservation programs to be considered. One such program is ex situ reintroduction. Prior to release, longterm monitoring and assessment of behavior is required to determine whether prides and coalitions behave naturally and are sufficiently adapted to a wild environment. Social network analysis （SNA） can be used to provide insight into how the pride as a whole and individuals within it, function. Our study was conducted upon 2 captive-origin prides who are part of an ex situ reintroduction program, and 1 wild pride of African lion. Social interactions were collected at all occurrence for each pride and categorized into greet, social grooming, play, and aggression. Betweenness centrality showed that offspring in each pride were central to the play network, whereas degree indicated that adults received （indegree） the greatest number of overall social interactions, and the adult males of each pride were least likely to initiate （outdegree） any interactions. Through the assessment of individual centrality and degree values, a social keystone adult female was identified for each pride. Social network results indicated that the 2 captive-origin prides had formed cohesive social units and possessed relationships and behaviors comparable with the wild pride for the studied behaviors. This study provided the first SNA comparison between captive-bred origin and a wild pride of lions, providing valuable information on individual and pride sociality, critical for determining the success of prides within an ex situ reintroduction program.

关键词： African lion Panthera leo conservation ex situ reintroduction social interactions.

Methodology of Single Crystal Growth and Microstructure Analysis of CoTi(Zr) Intermetallic Compounds

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j.urnal of Materials Science & Technology 2005年第6期21卷 817-821页

作者： Mike L.jenkins Glyn TAYLOR Department of Materials University of Oxford Parks Road Oxford OX1 3PH UK

The effects of preparation and crystal growth methods on the microstructure, composition, and oxidation of CoTi（Zr） intermetallics were dealt with . A group of methods has been used to produce CoTi and CoTi（Zr） crystals to prevent the formation of titanium oxide particles during melting and crystal growth. The results show that more oxides formed when using powdered starting materials even though the metals handled were and melted under an inert gas atmosphere; using bulk starting materials produced alloys showed less oxidation than powders, but adding a small amount of AI to getter the oxygen was not sufficient to prevent TiO2 formation. However, using a slightly reducing atmosphere during initial melting was highly effective in reducing the formation of oxide. Crystal growth carried out in Ar did not reduce the amount of oxide but only redistributed the particles. TiO2 particles were found only in the grain boundaries after crystal growing, where they obstructed grain growth. Crystal growth in a vacuum was found to be essential in producing oxide free crystals. A seed selection technique was developed and used in growing CoTi single crystals. The microstructures of the samples were determined using optical microscopy, scanning electron microscopy and transmission electron microscopy, including the morphologies, grain sizes, oxide distributions and crystal structure confirmation.

关键词： CoTi CoTi(Zr) Intermetallics Crystal growth Nicrostructure

Landslide Research at the British Geological Survey:Capture,Storage and Interpretation on a National and Site-Specific Scale

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 991-999页

作者： Catherine PENNINGTON Claire FOSTER j.nathan CHAMBERS Gareth jenkins British Geological Survey KeyworthNottinghamshireNG12 5GGUK

Landslide research at the British Geological Survey （BGS） is carried out through a number of activities, including surveying, database development and real-time monitoring of landslides. Landslide mapping across the UK has been carried out since BGS started geological mapping in 1835. Today, BGS geologists use a combination of remote sensing and ground-based investigations to survey landslides. The development of waterproof tablet computers （BGS＇SIGMAmobile）, with inbuilt GPS and GIS for field data capture provides an accurate and rapid mapping methodology for field surveys. Regional and national mapping of landslides is carried out in conj.nction with site-specific monitoring, using terrestrial LiDAR and differential GPS technologies, which BGS has successfully developed for this application. In addition to surface monitoring, BGS is currently developing geophysical ground-imaging systems for landslide monitoring, which provide real-time information on subsurface changes prior to failure events. BGS＇s mapping and monitoring activities directly feed into the BGS National Landslide Database, the most extensive source of information on landslides in Great Britain. It currently holds over 14 000 records of landslide events. By combining BGS＇s corporate datasets with expert knowledge, BGS has developed a landslide hazard assessment tool, GeoSure, which provides information on the relative landslide hazard susceptibility at national scale.

关键词： landslide National Landslide Database GeoSure hazard LiDAR geophysics

Innovative approaches to genome editing in avian species

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j.urnal of Animal Science and Biotechnology 2018年第2期9卷 278-284页

作者： Caitlin A.Cooper Timothy j.Doran Arj.n Challagulla Mark L.V.Tizard Kristie A.jenkins CSIRO Health and Biosecurity Australian Animal Health Laboratory

The tools available for genome engineering have significantly improved over the last 5 years, allowing scientist to make precise edits to the genome. Along with the development of these new genome editing tools has come advancements in technologies used to deliver them. In mammals genome engineering tools are typically delivered into in vitro fertilized single cell embryos which are subsequently cultured and then implanted into a recipient *** avian species this is not possible, so other methods have been developed for genome engineering in birds. The most common involves in vitro culturing of primordial germ cells(PGCs), which are cells that migrate through the embryonic circulatory system to the developing gonad and colonize the gonad, eventually differentiating into the gonadocytes which produce either sperm or ova. While in culture the PGCs can be modified to carry novel transgenes or gene edits, the population can be screened and enriched, and then transferred into a recipient embryo. The largest drawback of PGC culture is that culture methods do not transfer well across avian species, thus there are reliable culture methods for only a few species including the chicken. Two newer technologies that appear to be more easily adapted in a wider range of avian species are direct inj.ction and sperm transfection assisted gene editing(STAGE).The direct inj.ction method involves inj.cting genome engineering tools into the circulatory system of the developing embryo j.st prior to the developmental time point when the PGCs are migrating to the gonads. The genome engineering tools are complexed with transfection reagents, allowing for in vivo transfection of the PGCs. STAGE utilizes sperm transfection to deliver genome engineering tools directly to the newly fertilized embryo. Preliminary evidence indicates that both methodologies have the potential to be adapted for use in birds species other than the chicken, however further work is needed in this area.

关键词： Avian CRISPR Genome engineering PGCs Sperm TALEN

Immunology of a unique biological structure:the Echinococcus laminated layer

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Protein & Cell 2023年第2期14卷 87-104页

作者： Álvaro Díaz Anabella ABarrios Leticia Grezzi Camila Mouhape Stephen j.jenkins j.dith E.Allen Cecilia Casaravilla Área Inmunología Departamento de Biociencias(Facultad de Química)and Cátedra de InmunologíaInstituto de Química Biológica(Facultad de Ciencias)Universidad de la RepúblicaMontevideoUruguay Centre for Inflammation Research Queen's Medical Research InstituteUniversity of EdinburghEdinburghEH89JUUK Lydia Becker Institute of Immunology and Inflammation School of Biological SciencesUniversity of ManchesterManchester Academic Health Sciences CentreManchesterM139NQUK

The larval stages of the cestode parasites belonging to the genus Echinococcus grow within internal organs of humans and a range of animal *** resulting diseases,collectively termed echinococcoses,include maj.r neglected tropical diseases of humans and *** larvae are outwardly protected by the laminated layer(LL),an acellular structure that is unique to this *** LL is based on a fibrillar meshwork made up of mucins,which are decorated by galactose-rich *** addition,in the species cluster termed *** sensu lato,the LL features nano-deposits of the calcium salt of myo-inositol hexakisphosphate(Insp_(6)).The main purpose of our article is to update the immunobiology of the *** recent advances in this area are(i)the demonstration of LL“debris”at the infection site and draining lymph nodes,(ii)the characterization of the decoy activity of calcium Inp6 with respect to complement,(iii)the evidence that the LL mucin carbohydrates interact specifically with a lectin receptor expressed in Kupffer cells(Clec4F),and(iv)the characterization of what appear to be receptor-independent effects of LL particles on dendritic cells and *** information is missing on the immunology of this intriguing structure:we discuss gaps in knowledge and propose possible avenues for research.

关键词： mucin complement Echinococcus macrophage dendritic cell Clec4F

New insights into the in-process densification mechanism of cold spray Al coatings: Low deposition efficiency induced densification

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j.urnal of Materials Science & Technology 2019年第3期35卷 427-431页

作者： Richard jenkins Shuo Yin Barry Aldwell Morten Meyer Rocco Lupoi Trinity College Dublin The University of Dublin Department of Mechanical and Manufacturing Engineering

This work details new insights into the in-process densification mechanism of cold spray Al coatings. The results show a trend counter to common observations: coating plastic deformation levels and coating density decreases with an increase in particle impact velocity. A lower particle impact velocity and the consequent lower deposition efficiency(DE) results in greater tamping energy per unit volume of deposit,which is the primary reason for the observed trend. This is the first time that DE has been shown to have a non-linear impact on the density of a cold spray coating, with particle in-process tamping being the primary mechanism for coating densification.

关键词： Coating Hardness test Plastic deformation Tamping

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同时性传入刺激引起大鼠体感皮层的功能重组

中国医学科学院学报 1991年第4期13卷 278-282页

作者：恽君惕 Michael M.Merzenich Tracy j.Woodruff william M.jenkins 基础医学研究所 University of California at San Francisco USA

将大鼠的一对面部须毛粘合以便提供对须毛的同时刺激,4～8d后利用微电极在初级体感皮层测定各须毛的代表区,发现粘合须毛与正常对照大鼠须毛及自身的未粘合须毛相比,其皮层代表区有了显著的改变,主要是该对须毛代表区会聚面积的扩大。... 详细信息

将大鼠的一对面部须毛粘合以便提供对须毛的同时刺激,4～8d后利用微电极在初级体感皮层测定各须毛的代表区,发现粘合须毛与正常对照大鼠须毛及自身的未粘合须毛相比,其皮层代表区有了显著的改变,主要是该对须毛代表区会聚面积的扩大。这一发现支持过去的假设;皮层代表区及感受野的形成是由输入的相对强度及输入的时间结构决定的。

关键词：可塑性体感皮层大鼠