7,598 research outputs found
Nitrogen dynamics in a mature Miscanthus x giganteus crop fertilized with nitrogen over a five year period
peer-reviewedThe objective of this study was to investigate N dynamics and response to N fertilization
in a mature crop of Miscanthus x giganteus. A crop of Miscanthus x giganteus sown
in 1994 was fertilized with five N rates (0, 38, 63, 90 and 125 kg N/ha/year) over a five
year period (2008–2012) in Carlow, Ireland. Foliar chlorophyll concentrations were
directly related to N fertilization level throughout the study and rose after N applications
until July before falling with the onset of N remobilisation. Shoot numbers were
unaffected by N fertilization until the final years of the study when they increased with
N level. Crop height was unaffected by fertilization in the early years of the study but
in the final years of the study, it increased with N level until July after which the effect
diminished. There was a small but significant stimulation of harvested biomass yields
in autumn (average 15 t/ha) with increasing N fertilization, but there was no effect
on harvested yields in spring (average 10.5 t/ha). The N concentration in the rhizome
network gradually built up during the course of the study and was proportional to
N application. Aboveground biomass N content was also proportional to N application.
Nitrogen remobilisation between the October and February harvests was small;
abscissed leaves accounted for most of the N loss over this period. The deleterious environmental
consequences of N fertilizer may outweigh any potential economic benefits if
increases in biomass production are small or non-existent
From smart and corporate to urban and edgy: revitalising organisations in turbulent environments
Purpose: This paper aims to address issues surrounding the revitalising of organisations in turbulent environments.
Design/methodology/approach: The paper contains a discussion of relevant issues and presentation of research which considers how leaders today are choosing to function in a very uncertain environment, that of higher education.
Findings: The characteristics of urban and edgy organisations were all found to be evident in the leaders style in higher education. However, it was identified that this type of leadership rests on two critical axis–Knowledge management (shared and open) and the overarching style of leadership (empowerment and encouragement).
Research limitations/implications: This work is introductory and used a small sample as a pilot–further more extensive work is needed in this area.
Practical implications: This paper has introduced the idea of a new label for organisations which find themselves to be so full of diversity and differences that they can be characterised as being “on the edge” of danger–yet these organisations have found a way to be something which is separate from that of the urban character–important, flexible, dynamic, and playing a central role in development of new ideas.
Originality/value: The contribution made to the discipline of leadership is the introduction of a new way of looking at organisation–the work offers new ways of looking at established ideas, through new lenses which may assist leaders and all who work in large organisations
A colored operad for string link infection
Budney recently constructed an operad that encodes splicing of knots. He
further showed that the space of (long) knots is generated over this operad by
the space of torus knots and hyperbolic knots, thus generalizing the satellite
decomposition of knots from isotopy classes to the level of the space of knots.
Infection by string links is a generalization of splicing from knots to links.
We construct a colored operad that encodes string link infection. We prove that
a certain subspace of the space of 2-component string links is generated over a
suboperad of our operad by its subspace of prime links. This generalizes a
result from joint work with Blair from isotopy classes of knots to the space of
knots. Furthermore, all the relations in the monoid of 2-string links (as
determined in our joint work with Blair) are captured by our infection operad.Comment: Some changes and corrections, mostly suggested by the referee. 38
pages, 14 figures. To appear in Algebr. & Geom. Topo
Localised states in an extended Swift-Hohenberg equation
Recent work on the behaviour of localised states in pattern forming partial
differential equations has focused on the traditional model Swift-Hohenberg
equation which, as a result of its simplicity, has additional structure --- it
is variational in time and conservative in space. In this paper we investigate
an extended Swift-Hohenberg equation in which non-variational and
non-conservative effects play a key role. Our work concentrates on aspects of
this much more complicated problem. Firstly we carry out the normal form
analysis of the initial pattern forming instability that leads to
small-amplitude localised states. Next we examine the bifurcation structure of
the large-amplitude localised states. Finally we investigate the temporal
stability of one-peak localised states. Throughout, we compare the localised
states in the extended Swift-Hohenberg equation with the analogous solutions to
the usual Swift-Hohenberg equation
The Silent Epidemic: Perspectives of High School Dropouts
Presents findings from a survey that examines why some students do not complete their high school education, and what academic and personal supports would have helped them stay in school. Includes recommendations for improving graduation rates
Snakes and ladders: localized solutions of plane Couette flow
We demonstrate the existence of a large number of exact solutions of plane
Couette flow, which share the topology of known periodic solutions but are
localized in space. Solutions of different size are organized in a
snakes-and-ladders structure strikingly similar to that observed for simpler
pattern-forming PDE systems. These new solutions are a step towards extending
the dynamical systems view of transitional turbulence to spatially extended
flows.Comment: submitted to Physics Review Letter
Evolution in cluster cores since z~1
A large fraction of the stellar mass in galaxy clusters is thought to be
contained in the diffuse low surface brightness intracluster light (ICL). Being
bound to the gravitational potential of the cluster rather than any individual
galaxy, the ICL contains much information about the evolution of its host
cluster and the interactions between the galaxies within. However due its low
surface brightness it is notoriously difficult to study. We present the first
detection and measurement of the flux contained in the ICL at z~1. We find that
the fraction of the total cluster light contained in the ICL may have increased
by factors of 2-4 since z~1, in contrast to recent findings for the lack of
mass and scale size evolution found for brightest cluster galaxies. Our results
suggest that late time buildup in cluster cores may occur more through
stripping than merging and we discuss the implications of our results for
hierarchical simulations.Comment: To appear in the Proceedings of IAU Symposium 295 - The intriguing
life of massive galaxie
THE REUNIFICATION OF CRIMEA AND THE CITY OF SEVASTOPOL WITH THE RUSSIAN FEDERATION
Crimea and the City of Sevastopol justifiably separated from Ukraine and reunified with the Russian Federation in 2014. Support for this proposition is found in historic, economic, and political reasoning. Extant principles of public international law, derived from the Treaty of Westphalia, and subsequently developed by Great Powers to facilitate their strategic interests, when applied to the Crimean/Russian reunification, produce absurd results: nailing a population to a cross of misery, oppression, and poverty. In addition, the principles invoked are underdeveloped, prejudiced toward Nation States holding the imprimatur of “Great Powers,” and ignore individual and population preferences. Moreover, scholarly and jurist analyses repose upon an edifice of incomplete facts, and ignore the 1991 illegal annexation of Crimea by Ukraine. Crimea suffered twenty-three years of economic rot under Ukrainian rule. Under the Russian Federation, economic conditions in the peninsula are improving, despite the US/EU sanctions imposed upon the Crimean population, a cruelty that the Great Powers cannot justify. Exceptional circumstances that took place in Ukraine in 2013/14 permitted scheduling a referendum to seek independence from Ukraine. Polls taken after the 2014 referendum unanimously demonstrate that the population of Crimea and the City of Sevastopol prefer reunification with the Russian Federation, as opposed to going back and becoming a subject of Ukraine rule and exploitation under a US installed right wing regime. Repeated calls to “give back” Crimea to Ukraine are based on twisted historical narratives, solely designed to weaken the Russian Federation
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