High frequency dielectric response of the ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide

A study of the room-temperature ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide by dielectric relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addition to the already known lower frequency processes, there is a broad featureless dielectric loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the IL relative to each other, with additional contributions from their fast rotation.

Broadband dielectric response of the ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide

Dielectric relaxation measurements as a function of temperature, and of concentration in a non-coordinating solvent, the first reported for an ionic liquid, indicate a crossover in the relaxation mechanism due to varying levels of ion aggregation and the interplay of formation kinetics and relaxation dynamics of associates.

Characterising material and process variation effects on springback robustness for a semi-cylindrical sheet metal forming process

Variation in the incoming sheet material and fluctuations in the press setup is unavoidable in many stamping plants. The effect of these variations can have a large influence on the quality of the final stamping, in particular, unpredictable springback of the sheet when the tooling is removed. While stochastic simulation techniques have been developed to simulate this problem, there has been little research that connects the influence of the noise sources to springback. This paper characterises the effect of material and process variation on the robustness of springback for a semi-cylindrical channel forming operation, which shares a similar cross-section profile as many automotive structural components. The study was conducted using the specialised sheet metal forming package AutoForm^TM Sigma, for which a series of stochastic simulations were performed with each of the noise sources incrementally introduced. The effective stress and effective strain scatter in a critical location of the part was examined and a response window, which indicates the respective process robustness, was defined. The incremental introduction of the noise sources allows the change in size of the stressstrain response window to be tracked. The results showed that changes to process variation parameters, such as BHP and friction coefficient, directly affect the strain component of the stressstrain response window by altering the magnitude of external work applied to forming system. Material variation, on the other hand, directly affected the stress component of the response window. A relationship between the effective stressstrain response window and the variation in springback was also established.

Effective science teaching and a strategy for its implementation

Is the way being lost in teaching science? Many primary schools do not have a well developed culture of science teaching and learning, there is a declining interest in science over the years 7 to 10, and there are proportionally fewer students continuing onto science in the senior years. In response to these concerns, the Victorian Department of Education, Employment and Training (DEET) established a major initiative, the Science in Schools (SiS) Research Project, to enhance and invigorate science teaching and learning. During 2000 and 2001 the project team has worked with teachers in primary and secondary schools across Victoria to introduce new initiatives into their science programs. Central to the project are the SiS Components, a framework that describes effective science teaching, and the SiS Strategy, a process by which schools implement change. This paper outlines the SiS Components and Strategy and describes some of the findings that have emerged from the project.

Dielectric characterization of conducting textiles using free space transmission measurements: accuracy and methods for improvement

The dielectric behaviour of in-situ polymerized thin polypyrrole (PPy) films on synthetic textile substrates were obtained in the 1–18 GHz region using free space transmission and reflection methods. The PPy/para-toluene-2-sulphonic acid (pTSA) coated fabrics exhibited an absorption dominated total shielding effectiveness (SE) of up to −7.34 dB, which corresponds to more than 80% of incident radiation. The permittivity response is significantly influenced by the changes in ambient conditions, sample size and diffraction around the sample. Mathematical diffraction removal, time-gating tools and high gain horns were utilized to improve the permittivity response. A narrow time-gate of 0.15 ns produced accurate response for frequencies above 6.7 GHz and the high gain horns further improved the response in the 7.5–18 GHz range. Errors between calculated and measured values of reflection were most commonly within 2%, indicating good accuracy of the method.

Partnerships for effective teacher renewal

The Quality Teacher Program (QTP) recently introduced by the Commonwealth Government is a three year program that provides funding to strengthen the skills and understanding of those in the teaching profession.

In Victoria, The Association of Independent Schools of Victoria (AISV) in response to this initiative, has developed a project entitled ‘School-based Teacher Renewal’ involving three independent sector specific strategies and one cross-sectoral strategy.

One of these strategies, ‘Teacher Renewal Through Partnerships’ is a strategy which focuses on schools establishing a teacher renewal coordinating team being assisted by a university facilitator to address issues of teacher renewal. Schools were required to develop a Quality Teacher Strategic Plan associated with target curriculum area/s. Integral to this strategy is the provision of an external facilitator to support the teacher renewal coordinating team in each school

Approximately 46 academic staff from Faculties of Education at Deakin University and The University of Melbourne are working in partnership with AISV across 50 schools on this three year project.

This project builds on successful teacher professional development outcomes learned from the previous Commonwealth project, the Innovative Links Between Universities and Schools under the National Professional Development Program (NPDP) from 1994 to 1996.

This paper, presented by the Project Directors from Melbourne University and Deakin University will describe outcomes of the ‘Teacher Renewal Through Partnerships’ program and discuss findings gathered from experiences to date of those involved in this partnership program.

Inhibition of platelet aggregation by omega-3 polyunsaturated fatty acids is gender specific — redefining platelet response to fish oils

Existence of gender differences in cardiovascular disease (CVD) following long-chain omega-3 polyunsaturated fatty acid (LCn-3 PUFA) supplementation have suggested that sex hormones play a role in cardio-protection. The objective of this study was to determine gender specific responses in the efficacy of LCn-3 PUFA to inhibit platelet aggregation in vitro. Blood was analyzed for collagen-induced platelet aggregation following pre-incubation with LCn-3 PUFA in healthy adults (n=42). Eicosapentaenoic acid (EPA) was significantly more effective in reducing platelet aggregation compared with docosapentaenoic acid (DPA) and docosahexaenoic acid (DHA). When grouped by gender, this differential pattern was followed in males only. In females, DHA, DPA and EPA were all equally effective. Between group analyses (LCn-3 PUFA vs. gender) showed that both DHA and DPA were significantly less effective in males compared with females. EPA was equally effective in reducing platelet aggregation in both groups. These findings show that significant gender differences exist in platelet aggregation in response to various LCn-3 PUFA treatments.

Response of the child with autism to preferred prosody during instruction

It has been found that incorporating preferences leads to improvements in target skills for children with autism. No studies have been found, however, that assess the preferences of children for prosody of teacher instruction. Prosody has been defined by fluency of speech, modification of pitch and stress of syllables. This research assessed the preference for, and effectiveness of, prosody of instruction by teachers of children with autism. The preferences of children with autism for monotone, conversational and enthusiastic voice prosodies were assessed. The children's teachers made recording of their own voice reading a story passage in the three selected prosodies. The children with autism were requested to listen to these recordings and select a preferred prosody over thirty three trials. Chi square analyses were conducted to determine the significant preferences from these trials. The selections of prosody of the children with autism were compared with the selections of typical children of the same age. Significant preferences were found for three children with autism and seven typical children. The three children with autism with significant preferences were observed in their classrooms. Teachers were cued with flashcards to use the different prosodies and the children's responses were recorded. An additional twenty instructions were recorded in which the teachers were not given a cue for voice prosody Chi square and Fisher's exact tests indicated that children's preferences did not influence their responses to prosody during classroom instruction. In other words the response in class was not related to prosody preference. Overall children were more likely to not respond to the monotone prosody. The enthusiastic and conversational prosodies were equally effective. Therefore it was concluded that continued and varied use of enthusiastic and conversational prosodies during classroom instruction would be effective for children with autism. It was recommended that future research focus on evaluating the effectiveness of variety of prosody for children with autism.

Preparation, characterization and dielectric properties of temperature stable SrTiO3/PEEK composites for microwave substrate applications

Poly(ether ether ketone) (PEEK) is a potential candidate for electronic applications due to its low permittivity, low loss, high melting point, better chemical resistance, excellent insulating properties and easy processibility. Present paper discusses the preparation and characterization of SrTiO3 filled PEEK composite for microwave substrate applications. The dielectric constant, dielectric loss and temperature variation of dielectric constant of the composites have been studied up to 1 MHz using an Impedance Analyzer. Different theoretical approaches have been employed to predict the effective permittivity of composite systems and the results are compared with that of the experimental data. The crystallinity of the bulk composite is studied by X-ray diffraction studies. Scanning electron microscopic technique has been employed to study the dispersion of the particulate filler in PEEK matrix. Vickers hardness of pure and filled PEEK composite has been measured using Microhardness Tester. The effect of particle size on the dielectric as well as mechanical properties of SrTiO3/PEEK composite system is also studied by incorporating micronsize and nanosize fillers. Present study shows that a temperature stable composite can be realized by judiciously selecting appropriate filler concentration in the PEEK matrix.

Influence of dietary modifications on the blood pressure response to antihypertensive medication

Identifying dietary modifications that potentiate the blood pressure (BP)-lowering effects of antihypertensive medications and that are practical for free-living people may assist in achieving BP reduction goals. We assessed whether two dietary patterns were effective in lowering BP in persons on antihypertensive therapy and in those not on therapy. Ninety-four participants (38/56 females/males), aged 55.6 (sd 9.9) years, consumed two 4-week dietary regimens in random order (Dietary Approaches to Stop Hypertension (DASH)-type diet and low-Na high-K (LNAHK) diet) with a control diet before each phase. Seated home BP was measured daily for the last 2 weeks in each phase. Participants were grouped based on antihypertensive drug therapy. The LNAHK diet produced a greater fall in systolic BP (SBP) in those on antihypertensive therapy ( - 6.2 (sd 6.0) mmHg) than in those not on antihypertensive therapy ( - 2.8 (sd 4.0) mmHg) (P = 0.036), and this was greatest for those on renin-angiotensin system (RAS) blocker therapy ( - 9.5 (sd 6.4) mmHg) (interaction P = 0.007). The fall in SBP on the DASH-type diet, in those on therapy (overall - 1.1 (sd 6.2) mmHg; renin-angiotensin blocker therapy - 4.2 (sd 4.7) mmHg), was not as marked as that observed on the LNAHK diet. Dietary modifications are an important part of all hypertension management regimens, and a low-Na and high-K diet enhances the BP-lowering effect of antihypertensive medications, particularly those targeting the RAS.

Malwise-an effective and efficient classification system for packed and polymorphic malware

Signature-based malware detection systems have been a much used response to the pervasive problem of malware. Identification of malware variants is essential to a detection system and is made possible by identifying invariant characteristics in related samples. To classify the packed and polymorphic malware, this paper proposes a novel system, named Malwise, for malware classification using a fast application-level emulator to reverse the code packing transformation, and two flowgraph matching algorithms to perform classification. An exact flowgraph matching algorithm is employed that uses string-based signatures, and is able to detect malware with near real-time performance. Additionally, a more effective approximate flowgraph matching algorithm is proposed that uses the decompilation technique of structuring to generate string-based signatures amenable to the string edit distance. We use real and synthetic malware to demonstrate the effectiveness and efficiency of Malwise. Using more than 15,000 real malware, collected from honeypots, the effectiveness is validated by showing that there is an 88 percent probability that new malware is detected as a variant of existing malware. The efficiency is demonstrated from a smaller sample set of malware where 86 percent of the samples can be classified in under 1.3 seconds.

Australia's response to sexualised or sexually abusive behaviours in children and young people.

Responding to children and young people with sexualised or sexual offending behaviours presents significant challenges across the allied health, child protection, education and juvenile justice sectors. This report maps the specialised therapeutic services designed to effect positive behavioural change and thus divert young people with sexualised behaviours from the juvenile justice system. Accurate numbers on children with sexualised or sexual offending behaviours are difficult to determine. There are several factors contributing to this gap in understanding. These include entrenched ideals about children as inherently innocent, widespread ignorance about developmental sexuality, and the tendency of both young people and parents to deny or minimise incidents when they do occur.

In Australia, data on children with sexualised behaviours are not collected uniformly and nondisclosure contributes to what might be large numbers of offences going undetected. Mandatory reporting requirements apply where children display sexualised behaviours and are thought to be at risk of harm. Yet a general lack of knowledge as to what constitutes appropriate behaviour means that many may respond inappropriately to incidents of sexualised behaviours. This context of confusion, denial and non-disclosure creates a hidden population of children that continues to be at risk. Attention to redressing the contexts for non-disclosure is urgently required to ensure that children in need are provided with specialised therapeutic care.

This report presents qualitative data from interviews with specialised clinicians as well as submissions from service providers in both community and youth justice settings. In mapping the availability of therapeutic services, this report highlights a number of geographic and demographic gaps in service provision, including difficulties with eligibility criteria, referral pathways, funding arrangements and specialised workforce development. There are multiple challenges facing the tertiary services sector, yet the comprehensive provision of specialised services is just one part of the response required. This study emphasises the need for effective primary and secondary prevention to effect a reduction in the numbers of young people requiring counselling in the future. Consistent with the public health model, this report prioritises professional and community education strategies that would ultimately necessitate fewer tertiary services for young people and fewer places in juvenile detention centres.

Response rates in Australian market research

RICA commissioned Deakin University to “establish whether response rates are in decline in the Australian market research industry and to identify, as far as possible, the reasons for these declines if they exist. This is likely to involve a review of previous research, a literature review and collection of data on response rates provided on a confidential basis and with the assistance of AMSRO to facilitate data provision.”

Attempts were made to contact all listed market research companies in Australia, including all major internet panel companies. While industry co-operation was not high with the study, sufficient data was provided to depict current response rates and to show how they had declined over time. Because of the low contactability issues, this Report proposes the use of better methods to compute the reliability of survey estimates by taking account of past survey results.

The literature review revealed a wealth of recent studies, with the main emphasis being on studies of telephone and internet surveys. This review of the research produced 34 evidence-based guidelines for social researchers. While some of these reflect current practice, the emergence of the internet as the main survey method raises a number of disclosure and sampling issues. Esomar (2012) has produced 28 issues to be raised with providers, which sets the basis for good industry practice. This suggests an opportunity for the industry to adopt these standards as its own and to conduct training courses for major clients and suppliers. There are many panel providers, some of whom are not AMSRO members. AMSRO may need to examine what role it can play in mandating or encouraging adherence to these standards as a way of promoting the industry.

Talks with key industry people, as well as the literature, have revealed the importance of blended surveys, where multiple contact and response mechanisms are used. Particularly where an internet panel is used as one source, this poses representativeness and weighting issues which are difficult to resolve. The Report recommends that where blended survey methods are used, measures be taken to measure contactability in the other contact media, along with more sophisticated weighting schemes. The industry should examine its training courses to ensure that industry expertise keeps pace with these developments.
Summary of Results

The results focus on two main collection methods – the telephone and the internet. As far as the telephone is concerned response rates have been in a gradual decline the last decade. This outcome is hard to detect because the data show considerable fluctuations from one survey wave to the next. Among cold-calling surveys, telephone response rates are typically below 10%, for a range of topics and survey types. Co-operation rates, (the ratio of obtained interviews to refusals) are typically below 0.2 (that is below one interview to five refusals). Telephone interviews with clients have a higher response rate – typically above 20% with co-operation rates above 1.0. It would appear that some topics, such as financial services, may induce a lower level of co-operation. Government sponsored surveys have higher response rates, at times over 50%, but even here a sharp decline in response rates over time for one long running monitor was observed. Co-operation rates were also higher in government sponsored surveys.

One long data series from a telephone omnibus suggested that the “Do Not Call Register” which began in May, 2007 had some positive effects for the industry. Initially there was a spike in both response rates and co-operation. Although this was relatively short-lived, response rates thereafter declined more slowly and co-operation rates were somewhat higher and remained stable. These conclusions should be regarded as tentative as more data series would really be necessary to see if similar trends occurred elsewhere.

As far as the internet is concerned, panel response rates are around the 20% mark and appear to be relatively stable over the last few years. In this case, the gross response rate is the number of interviews divided by the number of invitations sent. As the number of invitations may be a function of the need to fill a survey quickly, it should be considered a gross indicator of response. In order to capture this phenomenon, a further measure has been devised, termed the “attempt rate” which measures the percentage of people who attempt to participate once sent the invitation. The available data suggests that it is relatively stable. However, it is also somewhat susceptible to the time the survey was left open. Finally, a co-operation rate was also calculated. It measures the ratio of completed to terminated interviews, typically at least five interviews to each termination, but often much higher. This measure is not directly comparable with the co-operation rate in telephone surveys because it cannot take account of the number of eligible people on the panel who open the invitation, see the company doing the survey or its length and decide not to take the survey. For internet client studies, response rates were typically somewhat higher than shown for the panels, but there was marked variability.

There was only one study provided of intercept interviews. It showed response rates of over 60% and co-operation rates of nearly 2 interviews per refusal. A strength and a weakness of intercept interviewing is the ability to be selective in who is asked to participate. As for mail, one government sponsored mail survey from 2010 is reported, with a response rate over 50%. The previous review contains more data, as mail appears to be infrequently used within the industry for commercial surveys.

While surveys remain a major and highly effective tool for the industry and its clients, issues with contactability and co-operation mean that even closer attention is needed to survey design, sampling, weighting and analysis than was previously the case.

Dielectric screening in atomically thin boron nitride nanosheets

Two-dimensional (2D) hexagonal boron nitride (BN) nanosheets are excellent dielectric substrate for graphene, molybdenum disulfide, and many other 2D nanomaterial-based electronic and photonic devices. To optimize the performance of these 2D devices, it is essential to understand the dielectric screening properties of BN nanosheets as a function of the thickness. Here, electric force microscopy along with theoretical calculations based on both state-of-the-art first-principles calculations with van der Waals interactions under consideration, and nonlinear Thomas-Fermi theory models are used to investigate the dielectric screening in high-quality BN nanosheets of different thicknesses. It is found that atomically thin BN nanosheets are less effective in electric field screening, but the screening capability of BN shows a relatively weak dependence on the layer thickness.

Integrating multibeam backscatter angular response, mosaic and bathymetry data for benthic habitat mapping

Multibeam echosounders (MBES) are increasingly becoming the tool of choice for marine habitat mapping applications. In turn, the rapid expansion of habitat mapping studies has resulted in a need for automated classification techniques to efficiently map benthic habitats, assess confidence in model outputs, and evaluate the importance of variables driving the patterns observed. The benthic habitat characterisation process often involves the analysis of MBES bathymetry, backscatter mosaic or angular response with observation data providing ground truth. However, studies that make use of the full range of MBES outputs within a single classification process are limited. We present an approach that integrates backscatter angular response with MBES bathymetry, backscatter mosaic and their derivatives in a classification process using a Random Forests (RF) machine-learning algorithm to predict the distribution of benthic biological habitats. This approach includes a method of deriving statistical features from backscatter angular response curves created from MBES data collated within homogeneous regions of a backscatter mosaic. Using the RF algorithm we assess the relative importance of each variable in order to optimise the classification process and simplify models applied. The results showed that the inclusion of the angular response features in the classification process improved the accuracy of the final habitat maps from 88.5% to 93.6%. The RF algorithm identified bathymetry and the angular response mean as the two most important predictors. However, the highest classification rates were only obtained after incorporating additional features derived from bathymetry and the backscatter mosaic. The angular response features were found to be more important to the classification process compared to the backscatter mosaic features. This analysis indicates that integrating angular response information with bathymetry and the backscatter mosaic, along with their derivatives, constitutes an important improvement for studying the distribution of benthic habitats, which is necessary for effective marine spatial planning and resource management.