289 research outputs found
A Hedonic Analysis of the Value of Parks and Green Spaces in the Dublin Area [on housing market]. ESRI WP331. November 2009
We use a hedonic house price model to estimate the value of green spaces and parks to homeowners in the Dublin area. Using a dataset of house sales between 2001 and 2006 and combining it with available data on the location of green spaces in Dublin it is possible to assess the different values assigned to green areas by homeowners. We find that the value of green space depends first of all on how far from the property it is located. We also find a difference in the values assigned to open access parks and green spaces. For every 10% increase in the share of green space and park area near a house, its average price increases by 7% to 9%. We also attempted to identify different individual parks and rank them according to their value, however due to spatial multicollinearity the results were mixed
Life Under the Japs: Stories from a Prisoner-of-War Camp
All physical materials associated with the New England Province Archive are currently held by the Jesuit Archives in St. Louis, MO. Any inquiries about these materials should be directed to the Jesuit Archives . Electronic versions of some items and the descriptions and finding aids to the Archives, which are hosted in CrossWorks, are provided only as a courtesy.
Life Under the Japs is the story of Rev. John J. Dugan, S.J., a military chaplain taken as a Japanese prisoner of war in the Philippines after the fall of Bataan in April 1942. His ordeal is relayed through a series of interviews conducted by William de Lue and originally published in the Boston Globe in April 1945. This publication was edited by Joseph P. Duffy, S.J.https://crossworks.holycross.edu/nenprovhistory/1007/thumbnail.jp
A Hedonic Analysis of the Value of Rail Transport in the Greater Dublin Area. ESRI WP264. November 2008
We use a hedonic house price model to estimate the value of transport networks to homeowners in the Dublin area. Using a dataset of house sales between 2001 and 2006 and combining it with available geographical information system data on the train and tram lines in Dublin, it is possible to assess the values assigned to different transport links by homeowners. We find that the value of transport depends on how far from the property it is located and is also affected by the availability of alternative transport options in the area. There are differences in the values assigned to recently constructed tramlines compared to the traditional rapid transit train stations. The study also takes into account house characteristics and other environmental amenities
Involution of the mouse mammary gland is associated with an immune cascade and an acute-phase response, involving LBP, CD14 and STAT3
INTRODUCTION:
Involution of the mammary gland is a complex process of controlled apoptosis and tissue remodelling. The aim of the project was to identify genes that are specifically involved in this process.
METHODS:
We used Affymetrix oligonucleotide microarrays to perform a detailed transcript analysis on the mechanism of controlled involution after withdrawal of the pups at day seven of lactation. Some of the results were confirmed by semi-quantitative reverse transcriptase polymerase chain reaction, Western blotting or immunohistochemistry.
RESULTS:
We identified 145 genes that were specifically upregulated during the first 4 days of involution; of these, 49 encoded immunoglobulin genes. A further 12 genes, including those encoding the signal transducer and activator of transcription 3 (STAT3), the lipopolysaccharide receptor (CD14) and lipopolysaccharide-binding protein (LBP), were involved in the acute-phase response, demonstrating that the expression of acute-phase response genes can occur in the mammary gland itself and not only in the liver. Expression of LBP and CD14 was upregulated, at both the RNA and protein level, immediately after pup withdrawal; CD14 was strongly expressed in the luminal epithelial cells. Other genes identified suggested neutrophil activation early in involution, followed by macrophage activation late in the process. Immunohistochemistry and histological staining confirmed the infiltration of the involuting mammary tissue with neutrophils, plasma cells, macrophages and eosinophils.
CONCLUSION:
Oligonucleotide microarrays are a useful tool for identifying genes that are involved in the complex developmental process of mammary gland involution. The genes identified are consistent with an immune cascade, with an early acute-phase response that occurs in the mammary gland itself and resembles a wound healing process
Exploring Minimal Scenarios to Produce Transversely Bright Electron Beams Using the Eigen-Emittance Concept
Next generation hard X-ray free electron lasers require electron beams with
low transverse emittance. One proposal to achieve these low emittances is to
exploit the eigen-emittance values of the beam. The eigen-emittances are
invariant under linear beam transport and equivalent to the emittances in an
uncorrelated beam. If a correlated beam with two small eigen-emittances can be
produced, removal of the correlations via appropriate optics will lead to two
small emittance values, provided non-linear effects are not too large. We study
how such a beam may be produced using minimal linear correlations. We find it
is theoretically possible to produce such a beam, however it may be more
difficult to realize in practice. We identify linear correlations that may lead
to physically realizable emittance schemes and discuss promising future
avenues.Comment: 7 pages, 2 figures, to appear in NIM
A Parametric Technique for Traps Characterization in AlGaN/GaN HEMTs
A new parametric and cost-effective tech- nique is developed to decouple the mechanisms behind current degradation in AlGaN/GaN HEMTs under a nor- mal device operation: self-heating and charge trapping. A unique approach that investigates charge trapping using both source (IS) and drain (ID) transient currents for the first time. Two types of charge trapping mechanisms are identified: (i) bulk charge trapping occurring on a time scale of less than 1 ms, followed by (ii) surface charge trapping with a time constant larger than a millisecond. Through monitoring the difference between IS and ID, a bulk charge trapping time constant is found to be independent of both drain (VDS ) and gate (VGS ) biases. Surface charge trapping is found to have a much greater impact on a slow degrada- tion when compared to bulk trapping and self-heating. At a short timescale ( 1 ms), the dynamic ON resistance degradation is predominantly limited by surface charge trapping
Specific Heat of the 2D Hubbard Model
Quantum Monte Carlo results for the specific heat c of the two dimensional
Hubbard model are presented. At half-filling it was observed that
at very low temperatures. Two distinct features were also identified: a low
temperature peak related to the spin degrees of freedom and a higher
temperature broad peak related to the charge degrees of freedom. Away from
half-filling the spin induced feature slowly disappears as a function of hole
doping while the charge feature moves to lower temperature. A comparison with
experimental results for the high temperature cuprates is discussed.Comment: 6 pages, RevTex, 11 figures embedded in the text, Submitted to Phys.
Rev.
Challenges for room temperature operation of electrically pumped GeSn lasers
Recent demonstrations of room-temperature lasing in optically pumped GeSn show promise for
future CMOS compatible lasers for Si-photonics applications. However, challenges remain for
electrically pumped devices. Investigation of the processes that limit device performance is therefore
vital in aiding the production of future commercial devices. In this work, a combined experimental
and modelling approach is utilised to explore the dominant loss processes in current devices. By
manipulating the band structure of functioning devices using high hydrostatic pressure techniques
at low temperature, the dominant carrier recombination pathways are identifed. This reveals that
93±5% of the threshold current is attributable to defect-related recombination at a temperature,
T = 85 K. Furthermore, carrier occupation of L-valley states (carrier leakage) is responsible for 1.1±
0.3% of the threshold current, but this sharply increases to 50% with a decrease of just 30 meV in
the L-r separation energy. This indicates that thermal broadening of a similar order may reproduce
these adverse efects, limiting device performance at higher temperatures. Temperature dependent
calculations show that carrier occupation of indirect valley L-states strongly afects the transparency
carrier density and is therefore very sensitive to the Sn composition, leading to an efective
operational temperature range for given Sn compositions and strain values. Recommendations for
future device designs are proposed based on band structure and growth optimisations
Association of Body Mass Index and Extreme Obesity With Long-Term Outcomes Following Percutaneous Coronary Intervention
Background:
Previous studies have reported a protective effect of obesity compared with normal body mass index (BMI) in patients undergoing percutaneous coronary intervention (PCI). However, it is unclear whether this effect extends to the extremely obese. In this large multicenter registryâbased study, we sought to examine the relationship between BMI and longâterm clinical outcomes following PCI, and in particular to evaluate the association between extreme obesity and longâterm survival after PCI.
Methods and Results:
This cohort study included 25 413 patients who underwent PCI between January 1, 2005 and June 30, 2017, who were prospectively enrolled in the Melbourne Interventional Group registry. Patients were stratified by World Health Organizationâdefined BMI categories. The primary end point was National Death Indexâlinked mortality. The median length of followâup was 4.4 years (interquartile range 2.0â7.6 years). Of the study cohort, 24.8% had normal BMI (18.5â24.9 kg/m2), and 3.3% were extremely obese (BMI â„40 kg/m2). Patients with greater degrees of obesity were younger and included a higher proportion of diabetics (P<0.001). After adjustment for age and comorbidities, a Jâshaped association was observed between different BMI categories and adjusted hazard ratio (HR) for longâterm mortality (normal BMI, HR 1.00 [ref]; overweight, HR 0.85, 95% CI 0.78â0.93, P<0.001; mild obesity, HR 0.85, 95% CI 0.76â0.94, P=0.002; moderate obesity, HR 0.95, 95% CI 0.80â1.12, P=0.54; extreme obesity HR 1.33, 95% CI 1.07â1.65, P=0.01).
Conclusions:
An obesity paradox is still apparent in contemporary practice, with elevated BMI up to 35 kg/m2 associated with reduced longâterm mortality after PCI. However, this protective effect appears not to extend to patients with extreme obesity
A comparative study of epitaxial InGaAsBi/InP structures using Rutherford backscattering spectrometry, X-ray diffraction and photoluminescence techniques
In this work, we used a combination of photoluminescence (PL), high resolution X-ray diffraction (XRD), and Rutherford backscattering spectrometry (RBS) techniques to investigate material quality and structural properties of MBE-grown InGaAsBi samples (with and without an InGaAs cap layer) with targeted bismuth composition in the 3%â4% range. XRD data showed that the InGaAsBi layers are more homogeneous in the uncapped samples. For the capped samples, the growth of the InGaAs capped layer at higher temperature affects the quality of the InGaAsBi layer and bismuth distribution in the growth direction. Low-temperature PL exhibited multiple emission peaks; the peak energies, widths, and relative intensities were used for comparative analysis of the data in line with the XRD and RBS results. RBS data at a random orientation together with channeled measurements allowed both an estimation of the bismuth composition and analysis of the structural properties. The RBS channeling showed evidence of higher strain due to possible antisite defects in the capped samples grown at a higher temperature. It is also suggested that the growth of the capped layer at high temperature causes deterioration of the bismuth-layer quality. The RBS analysis demonstrated evidence of a reduction of homogeneity of uncapped InGaAsBi layers with increasing bismuth concentration. The uncapped higher bismuth concentration sample showed less defined channeling dips suggesting poorer crystal quality and clustering of bismuth on the sample surface
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