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Search Results: 1 - 10 of 6402 matches for " Edward Helmes "
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Development of a Canadian Adaptation of the Facts on Aging Quiz  [PDF]
Edward Helmes
Advances in Aging Research (AAR) , 2016, DOI: 10.4236/aar.2016.53007
Abstract: Accurate knowledge about older adults is desirable for research into aging populations. The Palmore Facts on Aging Quiz (FAQ) has been one of the most widely used measures of knowledge about aging that has been used in English-speaking countries. The original true-false version has largely been replaced by the current multiple-choice format. Here I present data on a Canadian multiple-choice FAQ from 172 older adult residents in the community with a mean age of 70.3 years old (SD = 8.88). The mean percentage correct on the Canadian FAQ-2C was 54.4%, a proportion higher than the recent Australian data and some older American data on older adults. The Canadian adaptation of the modified Australian multiple-choice version demonstrates the value of the local verification of FAQ items’ scoring key if the knowledge assessed by the FAQ is to be used accurately in a different country or if the local scoring key was developed several years earlier.
Personality change in older adults with dementia: Occurrence and association with severity of cognitive impairment  [PDF]
Edward Helmes, Maria C. Norton, Truls ?stbye
Advances in Aging Research (AAR) , 2013, DOI: 10.4236/aar.2013.21004

Personality change is among criteria for the diagnosis of dementia. We examine first whether personality changes are related to severity of cognitive impairment in a linear or an inverted-U fashion in 1132 demented older people from the Canadian Study of Health and Aging (CSHA) and 921 unimpaired older people. The proportion with reported change was larger for all measures in the demented group than in the cognitively unimpaired group, and was more consistent with a linear increase in personality change with increasing cognitive impairment than with an inverted-U relationship, as seen in only one variable. In our second (longitudinal) study, we evaluate which aspects of personality change most in dementia; changes in mood and an exaggeration of existing traits were the variables most closely related to the development of dementia.

Does Exercise in Older Adults Predict Problem Solving? The Role of Personality  [PDF]
E. Helmes, J. Brown
Advances in Aging Research (AAR) , 2016, DOI: 10.4236/aar.2016.52004
Abstract: Research suggests that physical fitness is positively associated with cognitive functioning in older adults, and that executive functions may be associated in particular. This study explored whether personality supplemented the relationship between physical activity and problem-solving. A computerized version of the Tower of London provided number of errors and time to completion as dependent variables using a sample of 65 community-dwelling older people. The NEO-FFI assessed the Big 5 dimensions of personality. Choice reaction time was used to control for changes in speed of processing with increased age. Age remained a significant predictor of both dependent variables, with neuroticism and agreeableness also showing predictive ability. Aerobic fitness was not associated with either outcome measure, suggesting that there might be differential effects of exercise on measures of different executive functions. Personality factors appear to have a stronger association with the cognitive function that has been reported previously.
Engaged, Practical Intellectualism: John Porter and ‘New Liberal’ Public Sociology
Richard Helmes-Hayes
The Canadian Journal of Sociology , 2009,
Abstract: Michael Burawoy’s plea for a “legitimate” public sociology that would help to realize a progressive, social democratic political project, in particular by contributing to the spread of human rights, has rekindled a very old, heated, and divisive debate over the nature and purpose of the discipline. My paper focuses on the contribution to this debate made by John Porter (1921–1979), probably Canada’s most famous and influential English-language sociologist to date. Following in a tradition of “New Liberal” scholarship developed in England near the end of the 19th century by Leonard Hobhouse and others, and introduced into Canadian academia and public service in the early decades of the 20th century, Porter developed and practised a type of methodologically sophisticated, “scientific” sociology that rejected the doctrine of value neutrality and advocated a form of “engaged practical intellectualism” intended to create a more thoroughgoing democracy in Canada. His approach is significant not only because it is an important and undocumented development in Canadian intellectual history, but because it has current relevance. My comparison of Porter’s notion of New Liberal sociology and Burawoy’s public sociology reveals many parallels between the two and demonstrates that a rereading of Porter’s work would add to the current debate on what a “legitimate public sociology” might look like.
Entanglement entropy scaling in the bilayer Heisenberg spin system
Johannes Helmes,Stefan Wessel
Physics , 2014, DOI: 10.1103/PhysRevB.89.245120
Abstract: We examine the entanglement properties of the spin-half Heisenberg model on the two-dimensional square-lattice bilayer based on quantum Monte Carlo calculations of the second R\'enyi entanglement entropy. In particular, we extract the dominant area-law contribution to the bipartite entanglement entropy that shows a non-monotonous behavior upon increasing the inter-layer exchange interaction: a local maximum in the area-law coefficient is located at the quantum critical point separating the antiferromagnetically ordered region from the disordered dimer-singlet regime. Furthermore, we consider subleading logarithmic corrections to the R\'enyi entanglement entropy scaling. Employing different subregion shapes, we isolate the logarithmic corner term from the logarithmic contribution due to Goldstone modes that is found to be enhanced in the limit of decoupled layers. At the quantum critical point, we estimate a contribution of $0.016(1)$ due to each $90^{\circ}$ corner. This corner term at the SU(2) quantum critical point deviates from the Gaussian theory value, while it compares well with recent numerical linked cluster calculations on the bilayer model.
Correlations and entanglement in quantum critical bilayer and necklace XY models
Johannes Helmes,Stefan Wessel
Physics , 2014, DOI: 10.1103/PhysRevB.92.125120
Abstract: We analyze the critical properties and the entanglement scaling at the quantum critical points of the spin-half XY model on the two-dimensional square-lattice bilayer and necklace lattice, based on quantum Monte Carlo simulations on finite tori and for different subregion shapes. For both models, the finite-size scaling of the transverse staggered spin structure factor is found in accord with a quantum critical point described by the two-component, three-dimensional $\phi^4$-theory. The second R\'enyi entanglement entropy in the absence of corners along the subsystem boundary exhibits area-law scaling in both models, with an area-law prefactor of $0.0674(7)$ [$0.0664(4)$] for the bilayer [necklace] model, respectively. Furthermore, the presence of $90^{\circ}$ corners leads to an additive logarithmic term in both models. We estimate a contribution of $-0.010(2)$ [$-0.009(2)$] due to each $90^{\circ}$ corner to the logarithmic correction for the bilayer [necklace] model, and compare our findings to recent numerical linked cluster calculations and series expansion results on related models.
Public Sociology in Canada: Debates, Research and Historical Context
Rick Helmes-Hayes,Neil Mclaughlin
The Canadian Journal of Sociology , 2009,
Transport in Almost Integrable Models: Perturbed Heisenberg Chains
P. Jung,R. W. Helmes,A. Rosch
Physics , 2005, DOI: 10.1103/PhysRevLett.96.067202
Abstract: The heat conductivity kappa(T) of integrable models, like the one-dimensional spin-1/2 nearest-neighbor Heisenberg model, is infinite even at finite temperatures as a consequence of the conservation laws associated with integrability. Small perturbations lead to finite but large transport coefficients which we calculate perturbatively using exact diagonalization and moment expansions. We show that there are two different classes of perturbations. While an interchain coupling of strength J_perp leads to kappa(T) propto 1/J_perp^2 as expected from simple golden-rule arguments, we obtain a much larger kappa(T) propto 1/J'^4 for a weak next-nearest neighbor interaction J'. This can be explained by a new approximate conservation law of the J-J' Heisenberg chain.
Observation on Mercury Concentration in Kao Bay (Halmahera) and Anggai Waters (Obi Island), North of Maluku
Makara Seri Sains , 2008,
Abstract: Observation on Mercury Concentration in Kao Bay (Halmahera) and Anggai Waters (Obi Island), North of Maluku. Observation on merkuri concentration in territorial waters of Kao Bay and Anggai have been done in January 2005. The result showed that mercury concentration in seawater and sediment in territorial waters of Kao Bay and Anggai waters still lower and still in line with peaceful threshold value for waters biota life. This data indicate that waste of mercury coming from activity of gold mining by PT Nusa Halmahera Raya (NHR) and illegal gold mining by society not yet polluted both of that waters.
Kondo proximity effect: How does a metal penetrate into a Mott insulator?
R. W. Helmes,T. A. Costi,A. Rosch
Physics , 2008, DOI: 10.1103/PhysRevLett.101.066802
Abstract: We consider a heterostructure of a metal and a paramagnetic Mott insulator using an adaptation of dynamical mean field theory to describe inhomogeneous systems. The metal can penetrate into the insulator via the Kondo effect. We investigate the scaling properties of the metal-insulator interface close to the critical point of the Mott insulator. At criticality, the quasiparticle weight decays as 1/x^2 with distance x from the metal within our mean field theory. Our numerical results (using the numerical renormalization group as an impurity solver) show that the prefactor of this power law is extremely small.
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