Microstructure-failure mode correlations in braided composites

Explication of the fracture processes of braided composites is needed for modeling their behavior. Described is a systematic exploration of the relationship between microstructure, loading mode, and micro-failure mechanisms in carbon/epoxy braided composites. The study involved compression and fracture toughness tests and optical and scanning electron fractography, including dynamic in-situ testing. Principal failure mechanisms of low sliding, buckling, and unstable crack growth are correlated to microstructural parameters and loading modes; these are used for defining those microstructural conditions which are strength limiting

'Moderate Islam': Defining the Good Citizen

On 23 August 2005, John Howard, then Prime Minister, called together Muslim ‘representatives’ from around the nation for a Muslim Summit in response to the London bombings in July of that year. One of the outcomes of the two hour summit was a Statement of Principles committing Muslim communities in Australia to resist radicalisation and pursue a ‘moderate’ Islam. Since then the ill-defined term ‘moderate Muslim’ has been used in both the political and media discourse to refer to a preferred form of Islamic practice that does not challenge the hegemony of the nation state and that is coherent with the principles of secularism. Akbarzadeh and Smith conclude that the terms ‘moderate’ and ‘mainstream’ are used to describe Muslims whom Australians should not fear in contrast to ‘extremists’. Ironically, the policy direction towards regulating the practice of Islam in Australia in favour of a state defined ‘moderate’ Islam signals an attempt by the state to mediate the practice of religion, undermining the ethos of secularism as it is expressed in the Australian Constitution. It also – arguably – impacts upon the citizenship rights of Australian Muslims in so far as citizenship presents not just as a formal set of rights accorded to an individual but also to democratic participation: the ability of citizens to enjoy those rights at a substantive level. Based on the findings of research into how Australian Muslims and members of the broader community are responding to the political and media discourses on terrorism, this article examines the impact of these discourses on how Muslims are practicing citizenship and re-defining an Australian Muslim identity

Evaluation of Flashover Voltage on Hydrophobic Polymer Insulators with Artificial Neural Network

This paper presents an experimental measurement of ac 50 Hz flashover voltage (kV) of hydrophobic polymer insulators. Hundred thirty five different testing conditions were used to evaluate the electrical performance of hydrophobic surfaces of composite polymer insulators. The study of flashover voltages depend on the silicone rubber (SiR) content (%) in Ethylene propylene diene monomer (EPDM) rubber, water conductivity (µS/cm), volume of water droplet (ml) and number of water droplets on the surface of polymer insulators. Artificial neural network (ANN) is used successfully to model nonlinear functions which are difficult to model using classical methods. ANN can estimate the values of flashover voltage (kV) for different polymer insulators. The proposed network is trained using different environmental wet condition such as; water conductivity, volume of water droplet and number of water droplets on the surfaces of composite different polymer. After training, the network can estimate the flashover voltage for different inputs. A comparison between the laboratory measurements of flashover voltages and computational results of ANN were convergent. The results obtained from applying ANN show that it can be used to model the data with accuracy of 96%. These results prove that ANN can be considered a successful model to evaluate the electrical performance of hydrophobic polymer insulators and predicts the best hydrophobic composite surface that withstands higher flashover voltage under wet contaminated weather condition.DOI:http://dx.doi.org/10.11591/ijece.v2i4.58

Development of a novel clinical scoring system for on-farm diagnosis of bovine respiratory disease in pre-weaned dairy calves.

Several clinical scoring systems for diagnosis of bovine respiratory disease (BRD) in calves have been proposed. However, such systems were based on subjective judgment, rather than statistical methods, to weight scores. Data from a pair-matched case-control study on a California calf raising facility was used to develop three novel scoring systems to diagnose BRD in preweaned dairy calves. Disease status was assigned using both clinical signs and diagnostic test results for BRD-associated pathogens. Regression coefficients were used to weight score values. The systems presented use nasal and ocular discharge, rectal temperature, ear and head carriage, coughing, and respiratory quality as predictors. The systems developed in this research utilize fewer severity categories of clinical signs, require less calf handling, and had excellent agreement (Kappa > 0.8) when compared to an earlier scoring system. The first scoring system dichotomized all clinical predictors but required inducing a cough. The second scoring system removed induced cough as a clinical abnormality but required distinguishing between three levels of nasal discharge severity. The third system removed induced cough and forced a dichotomized variable for nasal discharge. The first system presented in this study used the following predictors and assigned values: coughing (induced or spontaneous coughing, 2 points), nasal discharge (any discharge, 3 points), ocular discharge (any discharge, 2 points), ear and head carriage (ear droop or head tilt, 5 points), fever (≥39.2°C or 102.5°F, 2 points), and respiratory quality (abnormal respiration, 2 points). Calves were categorized "BRD positive" if their total score was ≥4. This system correctly classified 95.4% cases and 88.6% controls. The second presented system categorized the predictors and assigned weights as follows: coughing (spontaneous only, 2 points), mild nasal discharge (unilateral, serous, or watery discharge, 3 points), moderate to severe nasal discharge (bilateral, cloudy, mucoid, mucopurlent, or copious discharge, 5 points), ocular discharge (any discharge, 1 point), ear and head carriage (ear droop or head tilt, 5 points), fever (≥39.2°C, 2 points), and respiratory quality (abnormal respiration, 2 points). Calves were categorized "BRD positive" if their total score was ≥4. This system correctly classified 89.3% cases and 92.8% controls. The third presented system used the following predictors and scores: coughing (spontaneous only, 2 points), nasal discharge (any, 4 points), ocular discharge (any, 2 points), ear and head carriage (ear droop or head tilt, 5 points), fever (≥39.2°C, 2 points), and respiratory quality (abnormal respiration, 2 points). Calves were categorized "BRD positive" if their total score was ≥5. This system correctly classified 89.4% cases and 90.8% controls. Each of the proposed systems offer few levels of clinical signs and data-based weights for on-farm diagnosis of BRD in dairy calves

On the use of low-cost computer peripherals for the assessment of motor dysfunction in Parkinson’s disease – Quantification of bradykinesia using target tracking tasks

The potential of computer games peripherals to measure the motor dysfunction in Parkinson’s diseases is assessed. Of particular interest is the quantification of bradykinesia. Previous studies used modified or custom haptic interfaces, here an unmodified force feedback joystick and steering wheel are used with a laptop. During testing an on screen cursor moves in response to movements of the peripheral, the user has to track a continuously moving target (pursuit tracking), or move to a predetermined target (step tracking). All tasks use movement in the horizontal axis, allowing use of joystick or steering wheel. Two pursuit tracking tasks are evaluated, pseudo random movement, and a swept frequency task. Two step tracking tasks are evaluated, movement between two or between two of five fixed targets. Thirteen patients and five controls took part on a weekly basis. Patients were assessed for bradykinesia at each session using standard clinical measures. A range of quantitative measures was developed to allow comparison between and within patients and controls using ANOVA. Both peripherals are capable of discriminating between controls and patients, and between patients with different levels of bradykinesia. Recommendations for test procedures and peripherals are given

Coupling Between Periodic and Aperiodic Variability in SAX J1808.4-3658

We detect a significant broadening in the wings of the 401 Hz peak in the power spectrum of the accreting millisecond binary pulsar SAX J1808.4-3658. This feature is consistent with the convolution of the red noise present in the power spectrum with the harmonic line. We conclude that the flux modulated by the spin period shows aperiodic variability similar to the red noise in the overall flux, suggesting such variability also originates at the magnetic caps close to the neutron star surface. This is analogous to the results found in some longer period, higher magnetic field pulsators in high mass X-ray binaries.Comment: 16 pages, 3 figures, to be published in The Astrophysical Journa

The effects of primary care–based parenting interventions on parenting and child behavioral outcomes: a systematic Review

Behavioral parenting interventions can enhance positive parenting practice, which is crucial in preventing maltreatment and promoting child well-being. Primary care has been increasingly recognized as an underutilized platform to widely disseminate evidence-based parenting interventions, given parents’ ongoing access to primary care without stigma and the perceptions toward health-care providers as a trustworthy source of information about positive parenting. This study sought to explore the effects of primary care–based parenting interventions on parenting practice and child behavioral outcomes while examining the types of and the theories of change underlying these interventions. The review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guideline. Randomized controlled trials or quasi-experimental studies of interventions targeting caregivers of children aged between 1 and 17 were included in the review. Information sources included electronic databases, relevant government and private organizational websites, and expert consultations. The final sample included 17 studies focusing on 10 interventions. Positive results were found in knowledge gain, locus of control, monitoring, parent–child interactions, and negative discipline. Child behavior outcomes were inconsistent as most studies reported nonsignificant changes while one study reported significant intervention effects on various externalizing behaviors. A limited number of studies described the process of adapting, installing, and implementing the interventions in primary care. Future studies should examine the types, dosages, and delivery formats that are most suitable and sustainable in the context of primary care to maximize its utility in promoting child well-being while preventing maltreatment through integrated behavioral parenting interventions