Evaluation of Cyclic Behavior of Aircraft Turbine Disk Alloys

An evaluation of the cyclic behavior of three aircraft engine turbine disk materials was conducted to compare their relative crack initiation and crack propagation resistance. The disk alloys investigated were Inconel 718, hot isostatically pressed and forged powder metallurgy Rene '95, and as-hot-isostatically pressed Rene '95. The objective was to compare the hot isostatically pressed powder metallurgy alloy forms with conventionally processed superalloys as represented by Inconel 718. Cyclic behavior was evaluated at 650 C both under continuously cycling and a fifteen minute tensile hold time cycle to simulate engine conditions. Analysis of the test data were made to evaluate the strain range partitioning and energy exhaustion concepts for predicting hold time effects on low cycle fatigue

IR-Singularities in Noncommutative Perturbative Dynamics?

We analyse the IR-singularities that appear in a noncommutative scalar quantum field theory on $\mathcal{E}_4$. We demonstrate with the help of the quadratic one-loop effective action and an appropriate field redefinition that no IR-singularities exist. No new degrees of freedom are needed to describe the UV/IR-mixing.Comment: 6 pages, amsLaTe

ECONOMIC IMPACT EVALUATION OF GLOBAL MARKETING SUPPORT SERVICES - AN EXPORTS ASSISTANCE PROGRAM ON THE ECONOMY OF ARKANSAS

This study determines the impact of Global Marketing Support Services (GMSS) - an exports assistance program in assisting 13 small and medium sized businesses to export. The total impact of exports (direct, indirect and induced effects) on added value, employment, labor income and tax impacts in Arkansas are estimated using Impact Analysis for Planning (IMPLAN).International Relations/Trade,

Sport-related head injury and performance anxiety

Head injury in sport is a highly individualized experience; the symptoms and persistence tend to differ widely between athletes. Neurocognitive deficits in head injury may be worsened by the emotional reaction of the athlete to the injury. Athletes that are removed from play due to musculoskeletal injuries tend to be anxious about becoming reinjured are more likely to be depressed and may have low attention and reaction time. Emotions that result from removal from play can have emotional, psychosocial, and career implications for the athletes. Despite this, there is a lack of literature directly examining the impact of head injury on mood, attention and anxiety about returning to play. The present study found that within 20 collegiate athletes (Head injured n=9; control n=11) there were few group differences on self-reported measures of anxiety, depression, self-regulation, or attention. This may suggest that athletes do not become more anxious, depressed, or inattentive as a result of head injuries or at least that they do not perceive any long-term impacts of their injuries. Future research should use larger sample sizes to examine this research question. Clinicians and researchers should also consider adding sport-specific measures of mood to baseline testing for athletes, and periodic updates of these attitudes as awareness, detection, and removal from play becomes more common for sport-related head injury cases

Land management and ecosystem services. How collaborative research programmes can support better policies

Land management, the organisation of the use and development of land, is an important instrument for addressing problems of rising greenhouse gas emissions and loss of natural resources. Yet, natural-social systems in which land management policies are implemented are poorly understood, thus decreasing the effectiveness of these policies. Local studies provide valuable insights, though only for the local conditions prevalent during the investigated period. Synthesising local studies in order to generalise results is impaired by the variety of local conditions. Collaborative research programmes may prevent some of these problems. They support the share of insights across temporal, ecological and spatial-economic contexts. On the basis of existing literature, we identify the challenges which face synthesis and demonstrate how a German research programme attempts to address some of them

Small molecule conjugates with dimetal species for protein inhibition

Methods for targeting a protein by providing an inhibitor covalently linked to a rhodium(II) complex, introducing the inhibitor to the target protein and allowing the inhibitor and protein to interact. The rhodium(II) complex covalently linked to the inhibitor binds the target protein both inorganically and organically and forms stabilizing secondary contacts between the rhodium(II) complex and the protein