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Search Results: 1 - 10 of 804 matches for " Tracy Polius "
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A New Method of Estimating the Asset Rate of Return  [PDF]
Moawia Alghalith, Tracy Polius
Theoretical Economics Letters (TEL) , 2011, DOI: 10.4236/tel.2011.11001
Abstract: We present a new consumption-based method of estimating the asset rate of return.
Temperature Dependent Surface Resistivity Measures of Commercial, Multiwall Carbon Nanotubes (MWCNT), and Silver Nano-Particle Doped Polyvinyl Alcohol (PVA) Films  [PDF]
Matthew Edwards, Stephen Egarievwe, Afef Janen, Tatiana Kukhtarev, Jemilia Polius, John Corda
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.513093
Abstract: Pure and doped Polyvinylidene difluoride (PVDF) films, for the detection of infrared radiation, have been well documented using the mechanism of pyroelectricity. Alternatively, the electrical properties of films made from Polyvinyl Alcohol (PVA) have received considerable attention in recent years. The investigation of surface resistivities of both such films, to this point, has received far less consideration in comparison to pyroelectric effects. In this research, we report temperature dependent surface resistivity measurements of commercial, and of multiwall carbon nanotubes (MWCNT), or Ag-nanoparticle doped PVA films. Without any variation in the temperature range from 22°C to 40°C with controlled humidity, we found that the surface resistivity decreases initially, reaches a minimum, but rises steadily as the temperature continues to increase. This research was conducted with the combined instrumentation of the Keithley Model 6517 Electrometer and Keithley Model 8009 resistivity test fixture using both commercial and in-house produced organic thin films. With the objective to quantify the suitability of PVDF and PVA films as IR detector materials, when using the surface resistivity phenomenon, instead of or in addition to the pyroelectricity, surface resistivity measurements are reported when considering bolometry. We found that the surface resistivity measurements on PVA films were readily implemented.
Measured and Perceived Physical Fitness, Intention, and Self-Reported Physical Activity in Adolescence  [PDF]
Timo Jaakkola, Tracy Washington
Advances in Physical Education (APE) , 2011, DOI: 10.4236/ape.2011.12004
Abstract: Objective: The aim of this study was to investigate the associations among measured physical fitness, perceived fitness, intention towards future physical activity and self-reported physical activity through junior high school years. Methods: Study participants included 122 Finnish students who were 13 years old during Grade 7. The sample was comprised of 80 girls and 42 boys from 3 junior high schools (Grades 7-9). During the autumn semester of Grade 7, students completed fitness tests and a questionnaire analyzing self-perception of their physical fitness. The questionnaire delivered at Grade 8 included intention towards future physical activity. At Grade 9 students’ self-reported physical activity levels. Results: Structural Equation Modelling revealed an indirect path from physical fitness to self-reported physical activity via perceived physical fitness and intention towards future physical activity. The model also demonstrated a correlation between perceived physical fitness and physical activity. Squared multiple correlations revealed that perceived physical fitness explained 33 % of the actual physical fitness. Conclusions: The results of this study highlight the role of physical and cognitive variables in the process of adoption of physical activity in adolescence.
Collision Resolution MAC Protocols for Wireless Ad Hoc Networks  [PDF]
Xinhua Yang, Tracy Camp
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.51003
Abstract:

In wireless ad hoc networks, nodes cooperatively form a network without any infrastructure such as a BS/AP (base station or access point). The widely-used contention-based MAC protocol, IEEE 802.11b, is inefficient in multi-hop networks due to the hidden and exposed terminal problems. The most popular schedule-based MAC protocol, TDMA (time division multiple access), is difficult to implement in an ad hoc network due to the lack of infrastructure. The contribution of this paper is to provide the community novel and efficient MAC (medium access control) protocols (i.e., a collision resolution protocol) for a wireless ad hoc network without a centralized infrastructure. We propose two new MAC protocols (one distributed algorithm and one cluster-based algorithm) that use a collision resolution scheme for a network with a single BS/AP. We first compare the performance of our distributed algorithm with our cluster-based algorithm. Then, we compare our algorithm that performs better (i.e., our cluster-based algorithm) to TDMA in a two-hop network. The simulation results illustrate that our cluster-based algorithm provides higher throughput and lower delay than TDMA in a two-hop network.


Research Findings Using Mindfulness-Based Interventions for Chronic Pain  [PDF]
Tracy L. Skaer
Pain Studies and Treatment (PST) , 2015, DOI: 10.4236/pst.2015.34005
Abstract: Chronic pain is a complex condition that is very detrimental to physical and psychological wellbeing. It carries a significant level of disability and economic burden. Pain patients frequently experience comorbid mental illness (e.g. depression, anxiety, PTSD, insomnia) and often require psychotherapeutic interventions in addition to medication management. Mindfulness-based interventions (MBIs) have emerged as a means to treat several chronic conditions (e.g. chronic pain, depression, anxiety, substance abuse, stress, insomnia). The objective of this review is to evaluate the current research on the use of MBIs in chronic pain managment. Although there are several controlled trials on the use of MBIs in chronic pain management, only a few studies were found that demonstrated significant effects on pain intensity, quality of life, as well as physical and psychological functioning. Therefore, the current evidence is mixed and there are insufficient data to definitively confirm the full impact of the use of MBIs in chronic pain conditions such as fibromyalgia, chronic low back pain, rheumatoid arthritis, and chronic musculoskeletal pain. The lack of compelling evidence at this time signals a demand for higher quality investigations in this area. Research examining MBIs and concomitant CBT may be of great value in order to synergize and strengthen patient outcomes.
Understanding the Consequences of Property Rights Mismatches: a Case Study of New Zealand's Marine Resources
Tracy Yandle
Ecology and Society , 2007,
Abstract: Within fisheries and natural resource management literature, there is considerable discussion about the key roles that property rights can play in building biologically and socially sustainable resource management regimes. A key point of agreement is that secure long-term property rights provide an incentive for resource users to manage the resource sustainably. However, property rights mismatches create ambiguity and conflict in resource use. Though the term mismatches is usually associated with problems in matching temporal and spatial resource characteristics with institutional characteristics, I expand it here to include problems that can arise when property rights are incompletely defined or incompletely distributed. Property rights mismatches are particularly likely to occur over marine resources, for which multiple types of resource and resource user can be engaged and managed under a variety of regulatory regimes. I used New Zealand's marine resources to examine the causes and consequences of these property rights mismatches. New Zealand is particularly interesting because its property-rights-based commercial fishing regime, in the form of individual transferable quotas, has attracted considerable positive attention. However, my review of the marine natural resource management regime from a broader property rights perspective highlights a series of problems caused by property rights mismatches, including competition for resources among commercial, customary, and recreational fishers; spatial conflict among many marine resource users; and conflicting incentives and objectives for the management of resources over time. The use of a property rights perspective also highlights some potential solutions such as the layering of institutional arrangements and the improvement of how property rights are defined to encourage long-term sustainability.
Doubly damned: the experience of HIV-positive maternity
Tracy Morison
Psychology in Society , 2011,
Abstract:
Les Nations Unies font-elles plus de mal que de bien ? Les abus sexuels dans la République Démocratique du Congo
Tracy Russell
Voix Plurielles , 2010,
Abstract: Une organisation est aussi forte que l’est chacun de ses membres, et si la francophonie se veut une force viable dans l’avenir, il faut qu’elle tienne compte de ces conflits armés qui détruisent plusieurs de ses pays membres, mais aussi qu’elle aide à les résoudre. Toute la population en subit les conséquences néfastes, mais ce sont les femmes et les enfants qui sont les victimes principales de ces conflits. Trop souvent, les violations des droits de la personne commises contre eux sont impunies. Cet article porte sur un tel exemple de conflit, a savoir celui que conna t actuellement le Congo, où des abus sexuels sont perpétrés sur une grande échelle, et dont les auteurs sont, entre autres, les militaires et les civils qui travaillent pour les Nations Unies.
Impaired prosodic discrimination in patients with schizophrenia
Tracy Derek
Annals of General Psychiatry , 2006, DOI: 10.1186/1744-859x-5-s1-s209
Abstract:
Consumer Health Information Sources in the 21st Century
Tracy Daley
Dalhousie Journal of Interdisciplinary Management , 2011, DOI: 10.5931/djim.v7i2.62
Abstract:
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