REKORD: An Animated Short

http://deepblue.lib.umich.edu/bitstream/2027.42/83814/1/seandgt_1303274843.pd

Interlaminar Tensile Properties of Unidirectional and Woven Carbon Fiber Reinforced Toughened Epoxy Laminates

This project aims to develop a dataset on interlaminar tensile strength comparing unidirectional and woven thermoset matrix carbon fiber composites keeping ply count, matrix material, and fiber diameter constant. The interlaminar tensile strength is an important property relating to the delamination failure mode. Interlaminar tensile strength is determined using the ASTM D6415 testing standard. This test is a modified four-point bend test using a 90° curved beam test specimen. Laminates were produced by laying up pre-impregnated carbon fiber sheets onto a curved beam tooling. The unidirectional laminate was produced with 20 plies in a [0,0,90,0,0]4 layup pattern. The woven fiber laminate was produced with 20 plies of a 2x2 twill weave fabric in the 0° orientation. Both laminates were cured in an autoclave. The laminate panels were machined into the test specimens with a width of 1 inch. The ASTM D6415 tests were performed with a crosshead displacement rate of 2.0 mm/min until there was a drop in load indicating initial delamination. The unidirectional specimens had an average interlaminar tensile strength of 8.72 Ksi. The woven fabric specimens had an average interlaminar tensile strength of 9.52 Ksi. After testing, the specimens were sectioned and imaged using optical microscopy and scanning electron microscopy (SEM). The specimens for SEM were gold sputter coated and imaged under high vacuum mode. Imaging indicated that for unidirectional specimens, delamination started in the matrix then propagated along the ply boundary. Woven specimens appeared to fail in regions of excess matrix material at intersections of fiber orientations. It is recommended for continuing work to use a test fixture that does not need to be offset. It would also be beneficial to have adjustable span lengths for the top and bottom jaws to increase specimen compatibility. Lastly, increasing matrix toughness would increase failure loads where stress concentrations are common in components

Paediatrics : how to manage scabies

This narrative review addresses scabies, a highly contagious, pruritic infestation of the skin caused by the mite Sarcoptes scabiei var hominis. Scabies is a common disorder that has a prevalence worldwide estimated to be between 200 and 300 million cases per year. Infestation is of greatest concern in children, the elderly, immunocompromised people and resource-poor endemic populations at risk of chronic complications. A diagnosis of scabies involves a clinical suspicion, a detailed targeted history, clinical examination and contact tracing. Dermoscopy and microscopy, where available, is confirmatory. Due to its infectivity and transmissibility, the management for scabies requires a multimodal approach: topical antiscabetic agents are the first line for most cases of childhood classic scabies and their contacts, which must also be identified and treated to prevent treatment failure and reacquisition. Environmental strategies to control fomite-related reinfestation are also recommended. Oral ivermectin, where available, is reserved for use in high-risk cases in children or in mass drug administration programmes in endemic communities. The prevention of downstream complications of scabies includes surveillance, early identification and prompt treatment for secondary bacterial infections, often superficial but can be serious and invasive with associated chronic morbidity and mortality. Postscabetic itch and psychosocial stigma are typical sequelae of the scabies mite infestation. The early identification of patients with scabies and treatment of their contacts reduces community transmission. Although time consuming and labour intensive for caregivers, the implementation of appropriate treatment strategies usually results in prompt cure for the child and their contacts. Here, we provide a summary of treatments and recommendations for the management of paediatric scabies

Negotiation, bargaining, and discounts:generating WoM and local tourism development at the Tabriz bazaar, Iran

This paper examines the effects of negotiation intention, bargaining propensity, and discount satisfaction on word-of-mouth (WoM) behaviours for tourists visiting Tabriz bazaar, Iran. Data from 615-survey respondents highlight that tourists are motivated to conduct WoM behaviour when they are experientially satisfied with the opportunity to negotiate and bargain, and when they are satisfied with the discount they receive. This paper makes theoretical contributions to social exchange theory and presents managerial implications for policy-makers to generate tourism development

Exploring the Antecedents of Shadow Information Security Practices

Employees are both the first line of defence in organisations as well as a significant source of vulnerability. Behavioural research in information security (InfoSec) has studied compliance of employees with organisational directives. Less understood are ‘shadow security practices’–a related category of behaviour where employees invent InfoSec workarounds albeit with the intention of still complying with organisational InfoSec directives. In this research-in-progress paper, we present the theoretical development of a model, by conducting in-depth reviews of the relevant and multidisciplinary literatures, to identify the potential antecedents of the employees\u27 intention to perform shadow security

Evaluation of Terrestrial Laser Scanning and Ground Penetrating Radar for Field-Based High-Throughput Phenotyping in Wheat Breeding

Targeted adaptive physiological trait introgression, a method by which breeders seek to introduce specific characteristics into breeding germplasm in a specific and targeted manner, is one of the primary methods breeders are using to develop cultivars optimized for performance and yield under heat and drought conditions. In traditional breeding platforms, this is carried out in a stepwise fashion, with the crossing of parental lines and the phenotype-driven selection of offspring. As with other adaptive physiological traits, rapid field-based high-throughput phenotyping of early season aboveground biomass and ideal root architecture is limited by our inability to accurately and nondestructively characterize these important traits. Terrestrial laser scanning (TLS) and ground penetrating radar (GPR) have the potential to fill this gap by non-invasively estimating biomass and mapping three-dimensional above- and below-ground vegetation. The research objective was to evaluate the use of TLS to estimate aboveground wheat (Triticum aestivum L.) biomass. Linear regressions comparing mean canopy height and total plot forage yield for each experimental plot across four replications was poorly correlated (R^2 0.08). Mean plot normalized difference vegetation index measurements were evaluated against total plot forage biomass with limited correlation (R^2 0.036). The mean value of the TLS elevation points had the highest correlation with both plot (R^20.09458) and sub plot (R^2 0.37984) forage yield as compared to traditional platforms. GPR is a remote sensing technology that has been successfully used in the evaluation of coarse tree root biomass. Incorporating GPR into current crop phenotyping methodologies could potentially provide a long awaited solution to the current inability to efficiently phenotype roots under realistic field conditions. Here, the utility of using GPR to estimate root biomass of wheat was evaluated. GPR ability to predict root presence and absence was tested and GPR was able to differentiate root mass from soil significantly (α = 0.95, t = 1.96022). Linear regression between Log10 of the mean GPR amplitude return at the 0-3 ns range was compared with agronomic breeding traits. Overall increased amplitude was observed in plots scoring higher with regard to overall yield and yield components