Swimmers' experiences of organizational stress: Exploring the role of cognitive appraisal and coping strategies

This study investigated sport performers’ coping strategies in response to organizational stressors, examined the utility of Skinner, Edge, Altman, and Sherwood’s (2003) categorization of coping within a sport context, determined the short-term perceived effectiveness of the coping strategies used, and explored appraisal-coping associations. Thirteen national standard swimmers completed semi-structured, interval-contingent diaries every day for 28 days. Results revealed 78 coping strategies, which supported 10 of Skinner et al.’s (2003) families of coping. Twenty-four different combinations of coping families were identified. The perceived most effective coping family used in isolation was self-reliance and in combination was escape and negotiation. Stressful appraisals were associated with varied coping strategies. The results highlight the complexity of coping and point to the importance of appraisal-coping associations. Skinner et al.’s (2003) categorization of coping provides a promising conceptual framework for the development of coping research in sport

Speech Transmission Index from running speech : a neural network approach

Speech Transmission Index (STI) is an important objective parameter concerning speech intelligibility for sound transmission channels. It is normally measured with specific test signals to ensure high accuracy and good repeatability. Measurement with running speech was previously proposed, but accuracy is compromised and hence applications limited. A new approach that uses artificial neural networks to accurately extract the STI from received running speech is developed in this paper. Neural networks are trained on a large set of transmitted speech examples with prior knowledge of the transmission channels' STIs. The networks perform complicated nonlinear function mappings and spectral feature memorization to enable accurate objective parameter extraction from transmitted speech. Validations via simulations demonstrate the feasibility of this new method on a one-net-one-speech extract basis. In this case, accuracy is comparable with normal measurement methods. This provides an alternative to standard measurement techniques, and it is intended that the neural network method can facilitate occupied room acoustic measurements

Generation of unique mono-hydroxy-eicosatetraenoic acids from arachidonic acid by human neutrophils.

Incubation of [3H]arachidonic acid with the 17,000-g supernatant from homogenates of human neutrophils in the presence of indomethacin generated the unique metabolites 9-OH-5,7,11,14-eicosatetraenoic acid (9-HETE) and 8-HETE, in addition to 12-HETE, 11-HETE and 5-HETE. The human neutrophil chemotactic activity of the HETE products exhibited a rank-order of potency with 5-HETE greater than 8-HETE = 9-HETE greater than 11-HETE = 12-HETE. The expression of chemokinetic activity as well as chemotactic activity suggested that the endogenous production of these principles may influence the mobility of human neutrophils

How robust is the ring stain for evaporating suspension droplets?

The ring stain is commonly seen when droplets containing particles, such as coffee, are left to dry on a surface: a pinned contact line leads to outward radial flow, which is enhanced by the diverging evaporative flux at the contact line. As shown by Deegan et al. (1997) particles are swept outwards in this flow and create a ring which grows according to a simple power law with time. The final dried width and height of the ring should also be given by power laws of concentration, with both exponent equal to 0.5 provided all particles are in the ring, and the packing factor and ring profile are constant. We use suspensions of polystyrene particles in water with sizes ranging from 200 to 500 nm and initial concentrations c 0 from 0.009% to 1% deposited on glass substrates to investigate these scaling predictions. We vary the drying rate from 0.5 to 5 nl/s using humidity and reduced pressure, use a range of substrates to vary the initial contact angle between 5° and 35°, and invert the droplets to change the direction of gravity. We find that for all but the very lowest pressures, the ring height follows the predicted power law, with exponent equal to 0.50 ± 0.04 and the ring width having an exponent of 0.33 ± 0.05. The discrepancy between the measured and predicted width exponent is accounted for by an observed variation of droplet radius with concentration, and the presence of particles in the center of the droplet. In addition, for low pressures (fast evaporation) the scaling laws no longer hold: the ring is much narrower and there is significant deposition in the center of the droplet, possibly due to reduced particle-enhanced pinning

Crystal structure of the 3C protease from South African Territories type 2 foot-and-mouth disease virus

The replication of foot-and-mouth disease virus (FMDV) is dependent on the virus-encoded 3C protease (3Cpro). As in other picornaviruses, 3Cpro performs most of the proteolytic processing of the polyprotein expressed from the single open reading frame in the RNA genome of the virus. Previous work revealed that the 3Cpro from serotype A – one of the seven serotypes of FMDV – adopts a trypsin-like fold. Phylogenetically the FMDV serotypes are grouped into two clusters, with O, A, C, and Asia 1 in one, and the three South African Territories serotypes, (SAT-1, SAT-2 and SAT-3) in another. We report here the cloning, expression and purification of 3C proteases from four SAT serotype viruses (SAT2/GHA/8/91, SAT1/NIG/5/81, SAT1/UGA/1/97, and SAT2/ZIM/7/83) and the crystal structure at 3.2 Å resolution of 3Cpro from SAT2/GHA/8/91)

Power transfer allocation for open access using graph theory - fundamentals and applications in systems without loopflow

In this paper, graph theory is used to calculate the contributions of individual generators and loads to line flows and the real power transfer between individual generators and loads that are significant to transmission open access. Related lemmas are proved which present necessary conditions required by the method. Based on ac load flow solution a novel method is suggested which can decide downstream and upstream power flow tracing paths very fast and calculate the contribution factors of generations and loads to the line flows efficiently. The power transfer between generators and loads can also be determined. The suggested method is suitable for both active and reactive power tracings of real power systems.published_or_final_versio

Olympic and International Level Sports Coaches’ Experiences of Stressors, Appraisals, and Coping

The aim of this study was to use the cognitive-motivational-relational theory (CMRT) of stress and emotions as a lens to explore psychological stress with Olympic and international level sports coaches. In particular, the study aimed to explore situational properties of stressors and coaches’ appraisals to address voids in the published literature. Guided by my constructionist epistemological position that contains traces of post-positivism and my relativist view of reality, I conducted semi-structured interviews with six women and nine men. I applied abductive logic during latent thematic analyses to organise and analyse the data. The findings suggest that the coaches experienced many stressors that related to 10 themes (e.g. athlete concerns, performance) and that these stressors were underpinned by seven situational properties (e.g. ambiguity, imminence, novelty). The coaches reported challenge and threat appraisals and, to a lesser extent, benefit and harm/loss appraisals. The ways of coping that were discussed with the coaches related to seven families of coping (e.g. dyadic coping, support seeking) that each play a different role in adaptive processes. Collectively, the findings shed new light on the explanatory potential of situational properties and appraisals and go some way towards understanding coaches’ diverse experiences. The CMRT was a useful framework for understanding high level coaches’ stress transactions and, thus, could be used in future research with this unique population. Coaches, practitioners, and researchers should attend to the ways that coaches appraise and cope with stressors to facilitate their adaptation to the potentially stressful nature of coaching at the highest levels

HAT veertig jaar — 'n persoonlike oorsig

In 2005 was dit 40 jaar sedert die verskyning van die eerste uitgawe van HAT (Verklarende Handwoordeboek van die Afrikaanse Taal), onder redakteurskap van P.C. Schoonees, C.J. Swanepoel, S.J. du Toit en C.M. Booysen. Die ontwikkeling voor hierdie publikasie en daarna van HAT 2 en 3 onder die alleenredakteurskap van F.F. Odendal en van HAT 4 en 5 onder die gesamentlike redakteurskap van Odendal en R.H. Gouws, word oorsigtelik geskets. Sleutelwoorde: HAT (VERKLARENDE HANDWOORDEBOEK VAN DIE AFRIKAANSE TAAL), WAT (WOORDEBOEK VAN DIE AFRIKAANSE TAAL

Exotic neutrinoless double beta decay with Majoron-like emission

We discuss a novel mode of neutrinoless double-β decay with emission of a light Majoron-like scalar particle φ which couples via an effective 7-dimensional operator with a (V + A) lepton current and (V ± A) quark currents leading to a long-range contribution. Future double-β decay searches are sensitive to scales of the order ΛNP ≈ 1 TeV for the effective operator. In a left-right symmetric model, this mode can probe right-handed W boson masses up to 25 TeV