Deciduous Trees of Minnesota: a Winter Key

Keys are provided for the identification in winter condition of Minnesota\u27s native deciduous trees and also those commonly cultivated. A labelled plate of illustrations accompanies the keys, as does a brief selected reference list

To Bat or Not to Bat: An Examination of Contest Rules in Day-night Limited Overs Cricket

The tradition of tossing a coin to decide who bats first in a cricket match introduces a randomly-assigned advantage to one team that is unique in sporting contests. In this paper we develop previous work on this issue by examining the impact of the toss on outcomes of day-night one day international games explicitly allowing for relative team quality. We estimate conditional logit models of outcomes using data from day-night internationals played between 1979 and 2005. Other things equal, we find that winning the toss and batting increases the probability of winning by 31%. In contrast, winning the toss does not appear to confer any advantage if the team choose to bowl first.cricket, contest rules, match results, competitive balance, outcome uncertainty

Low-frequency local field potentials in primate motor cortex and their application to neural interfaces

PhD ThesisFor patients with spinal cord injury and paralysis, there are currently very limited options for clinical therapy. Brain-machine interfaces (BMIs) are neuroprosthetic devices that are being developed to record from the motor cortex in such patients, bypass the spinal lesion, and use decoded signals to control an effector, such as a prosthetic limb. The ideal BMI would be durable, reliable, totally predictable, fully-implantable, and have generous battery life. Current, state-of-the-art BMIs are limited in all of these domains; partly because the typical signals used—neuronal action potentials, or ‘spikes’—are very susceptible to micro-movement of recording electrodes. Recording spikes from the same neurons over many months is therefore difficult, and decoder behaviour may be unpredictable from day-today. Spikes also need to be digitized at high frequencies (~104 Hz) and heavily processed. As a result, devices are energy-hungry and difficult to miniaturise. Low-frequency local field potentials (lf-LFPs; < 5 Hz) are an alternative cortical signal. They are more stable and can be captured and processed at much lower frequencies (~101 Hz). Here we investigate rhythmical lf-LFP activity, related to the firing of local cortical neurons, during isometric wrist movements in Rhesus macaques. Multichannel spike-related slow potentials (SRSPs) can be used to accurately decode the firing rates of individual motor cortical neurons, and subjects can control a BMI task using this synthetic signal, as if they were controlling the actual firing rate. Lf-LFP–based firing rate estimates are stable over time – even once actual spike recordings have been lost. Furthermore, the dynamics of lf-LFPs are distinctive enough, that an unsupervised approach can be used to train a decoder to extract movement-related features for use in biofeedback BMIs. Novel electrode designs may help us optimise the recording of these signals, and facilitate progress towards a new generation of robust, implantable BMIs for patients.Research Studentship from the MRC, and Andy Jackson’s laboratory (hence this work) is supported by the Wellcome Trust

An Empirical Analysis of UK House Price Risk Variation by Property Type

This paper examines the different risk and return profiles of four different property types in England and Wales, both nationally and by region. The property types include flats, terraced houses, semi-detached and detached houses. Motivated by the ICAPM approach of Scruggs (1998) and using an EGARCH in mean model, we find evidence of a positive risk-return relationship, with particular regard to terraced and semi-detached housing, as well as asymmetric adjustment, suggesting that mid-range housing is the property type most like other risk-based assets, which could be due to these property types being the most popular with buy-to-let investors. We also find that this relationship differs across property types, as has previously been found across regions.publishersversionPeer reviewe

Alternative Cropping Systems for Traditional Monoculture Wheat Acres in the Southern Plains for Two Farm Sizes

The economics of five alternative crop production systems for the Southern Plains winter wheat production region, for both conventional tillage and no-till, for two farm sizes, was determined. Yield data were obtained from a three-year experiment conducted on three farm fields in the region. Tillage costs differ across farm size.Crop Production/Industries, Farm Management,

Effects of Vitamin E and Aspirin on Disease in Cattle

Author Institution (Bray): Department of Human Nutrition and Food Management, The Ohio State University; Author Institution (Wittum): Department of Veterinary Preventative Medicine, The Ohio State Universit

The First Spectrum of the Coldest Brown Dwarf

The recently discovered brown dwarf WISE 0855 presents our first opportunity to directly study an object outside the Solar System that is nearly as cold as our own gas giant planets. However the traditional methodology for characterizing brown dwarfs---near infrared spectroscopy---is not currently feasible as WISE 0855 is too cold and faint. To characterize this frozen extrasolar world we obtained a 4.5-5.2 $\mu$m spectrum, the same bandpass long used to study Jupiter's deep thermal emission. Our spectrum reveals the presence of atmospheric water vapor and clouds, with an absorption profile that is strikingly similar to Jupiter. The spectrum is high enough quality to allow the investigation of dynamical and chemical processes that have long been studied in Jupiter's atmosphere, but now on an extrasolar world.Comment: submitted to ApJ

Vacuum polarisation on asymptotically anti-de Sitter spacetimes

This thesis considers a real, massless, conformally coupled scalar field propagating on the covering space of four-dimensional anti-de Sitter space (CadS) and on four-dimensional Schwarzschild-anti de Sitter space (SadS). Numerical results for the vacuum polarisation are obtained in CadS with Robin conditions imposed at the boundary. A proof is given to demonstrate that results approach the same finite limit at the boundary unless Dirichlet conditions are imposed. Numerical results for the vacuum polarisation are obtained in SadS with Dirichlet conditions imposed at the boundary, using the extended coordinates method of renormalisation. These results are then extended for Robin boundary conditions, where we see qualitatively similar behaviour to that observed in CadS