Fillers for improved graphite fiber retention by polymer matrix composites

The results of a program designed to determine the extent to which elemental boron and boron containing fillers added to the matrix resin of graphite/epoxy composites prevent the release of graphite fibers when the composites are exposed to fire and impact conditions are described. The fillers evaluated were boron, boron carbide and aluminum boride. The conditions evaluated were laboratory simulations of those that could exist in the event of an aircraft crash and burn situation. The baseline (i.e., unfilled) laminates evaluated were prepared from commercially available graphite/epoxy. The baseline and filled laminates' mechanical properties, before and after isothermal and humidity aging, also were compared. It was found that a small amount of graphite fiber was released from the baseline graphite/epoxy laminates during the burn and impact conditions used in this program. However, the extent to which the fibers were released is not considered a severe enough problem to preclude the use of graphite reinforced composites in civil aircraft structure. It also was found that the addition of boron and boron containing fillers to the resin matrix eliminated this fiber release. Mechanical properties of laminates containing the boron and boron containing fillers were lower than those of the baseline laminates. These property degradations for two systems: boron (5 micron) at 2.5 percent filler loading, and boron (5 micron) at 5.0 percent filler loading do not appear severe enough to preclude their use in structural composite applications

The development and evaluation of the paediatric index of emotional distress (PI-ED)

Purpose: Current measures of anxiety and depression for children and young people (CYP) include somatic symptoms and can be lengthy. They can inflate scores in cases where there is also physical illness, contain potentially distressing symptoms for some settings and be impractical in clinical practice. The present study aimed to develop and evaluate a new questionnaire, the paediatric index of emotional distress (PI-ED), to screen for emotional distress in CYP, modelled on the hospital anxiety and depression scale. Methods: A school-based sample (n = 1026) was employed to examine the PI-ED’s psychometric properties and a clinical sample of CYP (n = 143) was used to establish its sensitivity and specificity. Results: Exploratory and confirmatory factor analyses identified a bi-factor model with a general emotional distress factor (‘cothymia’) and anxiety and depression as co-factors. The PI-ED demonstrated good psychometric properties and clinical utility with a cutoff score of 20. Conclusion: The PI-ED is a brief, valid and reliable clinical screening tool for emotional distress in CYP

Development, Evaluation, and Implementation of an Interfaith Pastors\u27 Peer Coaching Group in the Gentry, Arkansas Area

Problem During my first ten years of ministry I discovered that I was in a lonely work with little peer-interaction or stimulation. Sporadic attempts to find peer- support and friendship among other pastors left me feeling only slightly encouraged. I was concerned that I was not being challenged by another peer or group of peers or held accountable to any particular goals personally or professionally. Method This research presents a model where pastors came together from various churches and denominations in a small town setting, and developed peer-coaching relationships for the purpose of improving their personal and ministry goals. Peer coaching is a relation based process through which two or more professional colleagues work together to assess current challenges. Through collaboratively learned coaching skills they apply goal setting, action steps and accountability exercises in order to help each other experience greater fruitfulness and fulfillment in their lives. In order to determine if the participating pastors also desired a collaborative and accountable relationship with other pastors I administered a questionnaire at the beginning of the process. Another questionnaire was administered at the end of the four month experimentation time. Next I explored what the Bible said about accountability and peer relationships to determine that what we were doing was according to Scripture. I also researched any guidelines from Adventist theology of the church and Ellen White counsel to find support for interfaith collaboration. Results The six participants of the Interfaith Pastors’ Peer Coaching Group were very positive about their experience and indicated that they would like to continue similar peer-coaching accountable relationships for the sake of experiencing greater fruitfulness and fulfillment in their professional and personal lives. Conclusion In my opinion pastors of all Protestant denominations would benefit from developing peer-coaching relationships with other pastors in their local vicinity. Whether the pastor would be in a one-on-one peer partnering or in a peer-coaching group with several pastors, the result would be a clearer understanding of what God has called the individual to do in their life and perish. There would be a safety net of support and accountability that would sustain continued positive, healthy growth both personally and professionally

Insights from unifying modern approximations to infections on networks

Networks are increasingly central to modern science owing to their ability to conceptualize multiple interacting components of a complex system. As a specific example of this, understanding the implications of contact network structure for the transmission of infectious diseases remains a key issue in epidemiology. Three broad approaches to this problem exist: explicit simulation; derivation of exact results for special networks; and dynamical approximations. This paper focuses on the last of these approaches, and makes two main contributions. Firstly, formal mathematical links are demonstrated between several prima facie unrelated dynamical approximations. And secondly, these links are used to derive two novel dynamical models for network epidemiology, which are compared against explicit stochastic simulation. The success of these new models provides improved understanding about the interaction of network structure and transmission dynamics

Social encounter networks : characterizing Great Britain

A major goal of infectious disease epidemiology is to understand and predict the spread of infections within human populations, with the intention of better informing decisions regarding control and intervention. However, the development of fully mechanistic models of transmission requires a quantitative understanding of social interactions and collective properties of social networks. We performed a cross-sectional study of the social contacts on given days for more than 5000 respondents in England, Scotland and Wales, through postal and online survey methods. The survey was designed to elicit detailed and previously unreported measures of the immediate social network of participants relevant to infection spread. Here, we describe individual-level contact patterns, focusing on the range of heterogeneity observed and discuss the correlations between contact patterns and other socio-demographic factors. We find that the distribution of the number of contacts approximates a power-law distribution, but postulate that total contact time (which has a shorter-tailed distribution) is more epidemiologically relevant. We observe that children, public-sector and healthcare workers have the highest number of total contact hours and are therefore most likely to catch and transmit infectious disease. Our study also quantifies the transitive connections made between an individual's contacts (or clustering); this is a key structural characteristic of social networks with important implications for disease transmission and control efficacy. Respondents' networks exhibit high levels of clustering, which varies across social settings and increases with duration, frequency of contact and distance from home. Finally, we discuss the implications of these findings for the transmission and control of pathogens spread through close contact

Lipopolysaccharide and toll-like receptor 4 in dogs with congenital portosystemic shunts

Surgical attenuation of a congenital portosystemic shunt (CPSS) results in increased portal vein perfusion, liver growth and clinical improvement. Portal lipopolysaccharide (LPS) is implicated in liver regeneration via toll-like receptor (TLR) 4 mediated cytokine activation. The aim of this study was to investigate factors associated with LPS in dogs with CPSS. Plasma LPS concentrations were measured in the peripheral and portal blood using a limulus amoebocyte lysate (LAL) assay. LPS concentration was significantly greater in the portal blood compared to peripheral blood in dogs with CPSS (P = 0.046) and control dogs (P = 0.002). LPS concentrations in the peripheral (P = 0.012) and portal (P = 0.005) blood of dogs with CPSS were significantly greater than those of control dogs. The relative mRNA expression of cytokines and TLRs was measured in liver biopsies from dogs with CPSS using quantitative PCR. TLR4 expression significantly increased following partial CPSS attenuation (P = 0.020). TLR4 expression was significantly greater in dogs that tolerated complete CPSS attenuation (P = 0.011) and those with good portal blood flow on pre-attenuation (P = 0.004) and post-attenuation (P = 0.015) portovenography. Serum interleukin (IL)-6 concentration was measured using a canine specific ELISA and significantly increased 24 h following CPSS attenuation (P < 0.001). Portal LPS was increased in dogs with CPSS, consistent with decreased hepatic clearance. TLR4 mRNA expression was significantly associated with portal blood flow and increased following surgery. These findings support the concept that portal LPS delivery is important in the hepatic response to surgical attenuation. Serum IL-6 significantly increased following surgery, consistent with LPS stimulation via TLR4, although this increase might be non-specific

Trust in the US-EU fruit and vegetable chain: Do US exporters understand EU importers?

Research on organizational and inter organizational trust has become an important field in management and marketing literature, as it is perceived as a pivotal aspect of business transactions. However, clarifications are still needed on the issue of whom we trust; is the person whom we are trading with trusted, or the organization, or just the product‐quality? Not only has this question not been answered within this field of research, neither have cultural differences have been described to any great extent. Additionally, if the perceived factors important to establish trusting relationships may or may not be the same on the buyers and the sellers side in international business transaction in food chains. The primary objective of this research study therefore is to identify how well US exporters understand the elements of trust that establish strong relationships with EU importers. The Analytical Hierarchy Process was used to evaluate the importance of different trust elements in interviews conducted with US exporters and EU importers of fruits and vegetables. Results are compared, providing both a picture of the important facets of trust, as well as whether the partners understand the perspectives of the other partner

Fourth annual Science in the House exhibition at the new parliament building

Members of Parliament, the House of Representatives and researchers were in attendance at the 4th annual Science in the House exhibition in the New Parliament Building in Valletta at noon of Thursday 24th September 2015. The event was inaugurated under the auspices of the Off ce of the Speaker by Ray Scicluna. Following comments by Prof. Alex Felice, speeches were presented by MPs Deborah Schembri and Claudio Grech. A few comments were made on behalf of the Faculty of Science by Prof. Emmanuel Sinagra to commemorate the 100th anniversary of the founding of the Faculty of Science at the University of Malta. The formal opening of the event concluded with enlightening words from the University Rector, Prof. Juanito Camilleri. The exhibition consisted of 12 posters representative of various research projects at the University of Malta from the Faculties of Science, Medicine and Surgery, Dental Surgery and Health Sciences. A commemorative poster was also dis played by the Faculty of Science to celebrate its 100th anniversary, which coincides with the centennial of Einstein's theory of relativity. Science in the House is organised by the Malta Chamber of Scientists, the University Research Trust (RIDT) and the Science in the City, European Researchers' Night consortium. Science in the City, European Researchers Night is mainly funded by the EU Marie Sklodowska-Curie Action of the Horizon 2020 (H2020) Programme. It is recognised by Europe for Festivals, Festivals for Europe (EFFE).peer-reviewe

Industry-Academic Partnerships – Benefit or Burden?

In an applied discipline such as agribusiness management, there are many opportunities for collaboration between academia and industry. This article highlights opportunities for industry-academic partnerships through research, sabbatical leaves, consulting, outreach, student enrichment activities, and industry advisory boards. The principal benefits and pitfalls associated with each type of collaboration are discussed along with tips for managing industry-academic partnerships.industry partnerships, industry collaboration, Industrial Organization, Teaching/Communication/Extension/Profession, Q10,