Fungal community survey of Fraxinus excelior in New Zealand

The European Ash tree (Fraxinus excelsior) is widely grown throughout Europe. As a large deciduous tree species, it grows a tall, domed crown and has an attractive tree shape, so it is considered as a popular amenity tree species. European Ash is planted as an important forestry species in some European countries, and also often used for furniture making, due to its excellent wood quality. Ash species were introduced into New Zealand upon colonization in the 1800s. Recently, ash trees throughout Europe have been observed to become damaged or die due to a severe disease known as ash dieback, caused by the fungus Chalara fraxinea. We are concerned about what will happen to the introduced ash tree in New Zealand. To our knowledge, there have been no studies on the fungi that inhabit ash trees in New Zealand. It is unknown which fungal species were present in ash at the time of the introduction to New Zealand, or which New Zealand fungi colonized ash tree after the introduction. Currently, ash dieback is not believed to be present in New Zealand. The aim of this project was to determine the possible fungal communities on ash trees in New Zealand. We collected bark, bud and wood from three healthy ash trees, and used DNA-based methods to identify the fungi that inhabited these trees. We compared our study with a similar Swedish study to find differences and similarities in the fungi present on New Zealand and European ash trees. In total, we found 90 different fungal species. Of these species found, seven fungi could be species that came to New Zealand with the introduced ash tree. We also found one fungus that could possibly be said to have come from New Zealand. The pathogen causing ash dieback, Chalara fraxinea, was not detected

Nutritional and Defensive Chemistry of Three North American Ash Species: Possible Roles in Host Performance and Preference by Emerald Ash Borer Adults

Black ash (Fraxinus nigra), green ash (F. pennsylvanica), and white ash (F. americana) are the three most abundant ash species in the northeastern USA. We compared emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), adult performance and preference among seedlings of the three ash species, and then related performance and preference to foli- age nutritional quality and defensive compounds. Longevity of EAB adults reared on green and white ash was found to be greater than on black ash. EAB adult females also seemed to show feeding preference among the three species of ash trees because the total foliage area consumption was greater on green ash and white ash compared to black ash in dual-choice tests; however, the total mass of foliage consumed did not differ. The foliage of all ash species was high in nitrogen and in most macro- and micro-nutrients studied. The patterns of EAB performance and preference did not correspond to any of the individual chemical compounds tested (nitrogen, proteins, most macro- and micro-nutrients, or putative defensive compounds of ash seedlings). Never- theless, greater longevity of EAB adults on green and white ash compared to black ash was probably related to unbalanced nutrients (total nitrogen/total non-structural carbohydrate ratio) of black ash. Putative defensive compounds (i.e., phenolics and protease inhibitors) did not contribute to EAB longevity in this study, probably because (1) EAB adults were able to excrete most of these compounds and (2) their effects were alleviated by high nitrogen levels. More research is needed to elucidate the interactions of nitrogen and carbohydrate levels, and the interactions of nutrient balance and defensive plant allelochemicals on EAB performance and preference

Fast and Effective Change Management

{Excerpt} When embarking on a change initiative, one should rapidly implement change that results in the higher levels of performance that were envisioned when the decision to make the changes was made. To make this happen, organizations must first overcome the resistance to change and then secure as much discretionary effort as possible. John Kotter remains one of the most respected experts on the subject of change management. He began writing about change management back in the mid-1990s, when he first declared that only one change initiative in three actually achieved its stated objectives. After more than a decade of research by academics and practitioners, one would think that we are now doing a much better job of managing change. Actually, that does not seem to be the case. In 2008, McKinsey & Company conducted a global survey of change management and found just about the same results as Kotter had 12 years before—only a third of change management attempts are successful. What are we doing wrong

Entrepreneurship resources in US public libraries: website analysis

Purpose – This paper aims to explore the entrepreneurship resources patrons can discover and/or access on the web pages of the largest 46 US public libraries to assess the strength of public libraries’ current support to their entrepreneur-patrons, and where, and by what means, public libraries may wish to expand, or further promote, their support. Design/methodology/approach – The author completed a website analysis of the largest 46 US public libraries, as defined by the criteria in the ALA publication The Nation’s Largest Public Libraries. Website analysis was completed via a standardized checklist assessment of each library website. Findings – Public libraries often have print and electronic resources, meeting spaces and programming that could be of use to entrepreneur-patrons, but these resources are sometimes difficult to discover on library websites. Libraries have strong partnering relationships with other government and nonprofit organizations, but they may wish to expand these partnerships further. Practical implications – Public libraries in the US often have multiple support services to offer entrepreneur-patrons. However, if libraries would like to reach entrepreneur-patrons beyond their walls, as well as within them, they may wish to consider further refining the resources both accessible via their website and promoted on it. Originality/value – While there are research articles exploring how both academic and public libraries support entrepreneur-patrons, as yet, there has been no in-depth research into how public libraries support their entrepreneur-patrons through not only their in-library offerings but also the materials highlighted and/ or available via their website. This research addresses this gap in the literature.Publisher does not allow open access until after publicatio

The Untruthful Source: Writings, official and reform documentation 1900 - 1930

Ash’s article, ‘The untruthful source: Prisoner’s writings, official and reform documentation, 1900–1930’, published following her 2009 book on prison dress, questions how myths arose about the history of prisoners’ clothing in Britain in the first half of the 20th century. Ash shows that, although there was little critical writing about prisoners’ clothing in this period, the inmates’ own writing and archival documentation provide us with the means to achieve a new understanding of the political encounters played out in courtrooms. Ash’s research material included interwar Home Office circulars that announced the abolition of ‘broad arrow’ prison uniforms in 1920 and responses of prison governors that reveal their continuance after this date. Other key reform documents consulted by the author included those of Sidney and Beatrice Webb, Fenner Brockway’s 1922 Prison System Enquiry Committee Report, later published as English Prisons Under Local Government, which proposed radical prison reforms including the abolition of prison dress as criminal stigmatisation, and inmate testimonials of the continuance of the broad arrow uniform. The article demonstrates the difficulty for design historians investigating prison dress in establishing the truth about specific penal reform dates and practices on the basis of official government documents alone. Ash argues that the publications of penal reformers and the prison writings of inmates at the time also need to be read, in order to establish the clothing prisoners actually wore in confinement. Ash first presented this research as a paper to the 2009 Design History Society annual conference hosted by the theorising Visual Art and Design (tVAD) Research Group, School of Creative Arts, University of Hertfordshire. It was then selected to be peer reviewed and published in the University of Hertfordshire Working Papers on Design web-based journal

Environmentally Friendly Pervious Concrete for Treating Deicer-Laden Stormwater: Phase I

A graphene oxide-modified pervious concrete was developed by using low-reactivity, high-calcium fly ash as sole binder and chemical activators and other admixtures. The density, void ratio, mechanical strength, infiltration rate, Young’s modulus, freeze-deicer salt scaling, and degradation resistance of this pervious concrete were measured against three control groups. The test results indicate that graphene oxide modified fly ash pervious concrete is comparable to Portland cement pervious concrete. While the addition of 0.03% graphene oxide (by weight of fly ash) noticeably increased the compressive strength, split tensile strength, Young’s modulus, freeze-deicer salt scaling, and degradation resistance of fly ash pervious concrete, it reduced the void ratio and infiltration rate. The fly ash pervious concrete also showed unfavorable high initial loss during the freeze-deicer salt scaling test, which may be attributed to the low hydration degree of fly ash at early age. It is recommended that durability tests for fly ash concrete be performed at a later age

Water absorption and salt attack resistance of coal ash brick made of different percentage of foam content

Coal ash which constitute of fly ash and bottom ash were proved to be used as main component in brick production. However, published work on the coal ash brick with addition of foam in order to produce lightweight brick is still lacking. This thesis reports the effect of variation in foam content in coal ash brick on the density, water absorption and salt attack resistance. Comparison of those parameters was made between the coal ash bricks and conventional brick. The coal ash brick mixes were formulated using industrial by-product, ground granulated blastfurnace slag (GGBS) which is activated with an alkaline (hydrated lime or Portland cement) combined with coal ash from coal-fired thermal power plant. The blended binder comprising of hydrated lime (HL) – GGBS and Portland cement (PC) –GGBS were used to stabilize the coal ash brick. Foam was used to produce lightweight brick. The percentage of foam added to the brick mixes are 25%, 50% and 75%. A total of sixty (60) brick specimen subjected to ten (10) series of mix proportion were cast and put in air curing condition for at least 28 days before testing. The density measurement in accordance with AS/NZS 4456.8, water absorption test in accordance with BS EN 772-21 and salt attack resistance in accordance with AS/NZS 4456.10 were evaluated on the brick specimens. The results indicated that the density of coal ash brick decreases with the increase in foam content. Also for bricks composed of both blended binder, the water absorption were directly proportional to the amount of foam. Thus, the water absorption of foam brick increases with the reduction in density. Higher foam content leads increase of pores and capillaries in brick structure, therefore the brick become weaker to resist on salt attack. XRD pattern of formed brick with 75% of foam addition on HL-GGBS coal ash brick portrays ettringite formation were attributed to disruption of brick structure. The use of coal ash with HL–GGBS and PC-GGBS combination as binder agent has been observed to be lightweight, low in water absorption, and advantageous in protection to salt attack compare to the conventional brick. The optimum proportion respected to the foam content is 50% in balance condition with approximately 1-2% of mass loss due to salt attack, 12-13% of water absorption and density significantly reduced to 1600kg/m3 . Keywords – fly ash; bottom ash; hydrated lime; Portland cement; ground granulated blastfurnace slag (GGBS); foam; brick; density; water absorption; salt attack resistanc

Topological Speedups

Given a dynamical system $(X,T)$ one can define a speedup of $(X,T)$ as another dynamical system conjugate to $S:X\rightarrow X$ where $S(x)=T^{p(x)}(x)$ for some function $p:X\rightarrow\mathbb{Z}^{+}$. In $1985$ Arnoux, Ornstein, and Weiss showed that any aperiodic, not necessarily ergodic, measure preserving system is isomorphic to a speedup of any ergodic measure preserving system. In this paper we study speedups in the topological category. Specifically, we consider minimal homeomorphisms on Cantor spaces. Our main theorem gives conditions on when one such system is a speedup of another. Furthermore, the main theorem serves as a topological analogue of the Arnoux, Ornstein, and Weiss speedup theorem, as well as a 'one-sided" orbit equivalence theorem