bluuebunny/crossref_metadata_2025 huggingface dataset:
A Comparison of the Early Twenty-First Century Drought in the United States to the 1930s and 1950s Drought Episodes
Authors: Heim Richard R.
Published: May 2017

The United States experienced a severe drought that peaked in 2012 and was characterized by near-record extent, record warmth, and record dryness in several areas. For some regions, the 2012 drought was a continuation of drought that began in earlier years and continued through 2014. The 1998–2014 drought episode is compared to the two other major drought episodes of the twentieth century in terms of duration, areal extent, intensity, and spatial pattern using operational datasets produced by the National Oceanic and Atmospheric Administration/National Centers for Environmental Information. It is characterized by more short-term dryness, more concurrent (regional) wetness, and warmer temperatures than the other two drought episodes. The implications of these differences for water resource managers and decision-makers are discussed.
Vernov Satellite Data of Transient Atmospheric Events
Authors: Klimov Pavel , Garipov Gali , Khrenov Boris , Morozenko Violetta , Barinova Vera , Bogomolov Vitaly , Kaznacheeva Margarita , Panasyuk Mikhail , Saleev Kirill , Svertilov Sergey
Published: May 2017

Data on transient atmospheric events (TAEs) were obtained from the Vernov satellite and are presented in this paper. The data are considered in conjunction with previous data obtained by the Universitetsky-Tatiana-1 and Universitetsky-Tatiana-2 satellites. The larger volume of stored scientific data in the Vernov mission and its advanced ultraviolet (UV) and red–infrared (R–IR) radiation detector (DUV) measurements allowed improved TAE-distribution data to be obtained over a wide range of photon numbers. The difference between features of luminous transients and “dim” transients, measured by the Universitetsky-Tatiana-2 satellite, is confirmed by Vernov’s data. There are also interesting dim UV events with no R–IR radiation. Such events are expected to be deep in the atmosphere at the level of thunderstorm clouds. They might be radiated by electric discharges of less power than lightning; in fact, at the preliminary stage of lightning. The observation of repeating dim TAEs in various time intervals, starting from tens of milliseconds and up to minutes, indicates that thunderstorm electric activity is much more variable than pure lightning strikes.
Complementary and Alternative Medicine Use in Uninsured Children in Texas
Authors: Misra Sanghamitra M. , Guffey Danielle , Roth Isabel , Giardino Angelo P.
Published: May 2017

Use of complementary and alternative medicine (CAM) among US children is 12% according to the 2012 National Health Interview Study. Certain pediatric populations have higher CAM use. We studied an uninsured population because limited access to care likely results in higher CAM use. We surveyed 250 uninsured patients in a free pediatric mobile clinic program. In the largely Hispanic population, rate of CAM use in the preceding 12 months was 45% among children and 59% among parents. Ninety-one percent of children who used CAM had parents who used CAM while only 32% of parents used CAM for themselves but did not use CAM for their children ( P < .001). Seven parents (3%) and 4 children (2%) had ever discussed their CAM use with a physician. Since CAM use is significant in this uninsured population and families do not generally discuss CAM with physicians, health care providers must ask about CAM use and provide guidance.
Differential Applicability of Criminological Theories to Individuals? The Case of Social Learning vis-à-vis Social Control
Authors: Ward Jeffrey T. , McConaghy Megan , Bennett Juwan Z.
Published: May 2017

The current study uses finite mixture models (FMMs) to examine whether competing theories—social learning and social control—are differentially applicable to individuals. Posterior probabilities reveal that 85% of individuals are most consistent with social learning theory (“learners”), whereas 15% are most consistent with social bonding theory (“bonders”). Relative to bonders, learners have significantly lower alcohol consumption and alcohol use risk—as denoted by learning and bonding variables. Results reveal generally stronger variable effects in the FMM as compared with the full-sample ordinary-least-squares (OLS) regression, particularly for differential association and belief. OLS regressions among classified subsamples resulted in substantial gains in explained variance among learners but no improvements among bonders. Implications of differential applicability of theories for assessments of theoretical validity and policy development are discussed.
Real-Time Imaging of Gap Progress during and after Composite Polymerization
Authors: Hayashi J. , Shimada Y. , Tagami J. , Sumi Y. , Sadr A.
Published: May 2017

The aims of this study were to observe the behavior of composite and formation of gaps during and immediately after light polymerization using swept source optical coherence tomography (OCT) and to compare the interfacial integrity of adhesives in cavities through 3-dimensional (3D) image analysis. Forty tapered cylindrical cavities (4-mm diameter, 2-mm depth) were prepared in bovine incisors and restored using Bond Force (BF), Scotchbond Universal Adhesive (SBU), OptiBond XTR (XTR), or Clearfil SE Bond 2 (SE2), followed by Estelite Flow Quick flowable composite. Real-time imaging was performed at the center of restoration by the OCT system (laser center wavelength: 1,330 nm; frequency: 30 KHz) during and up to 10 min after light curing. The 3D scanning was performed 0, 1, 3, 5, and 10 min after light curing. The percentages of sealed enamel and dentin interface area (E%, D%) were calculated using Amira software. In real-time videos, the initial gaps appeared as a bright scattered area mainly on dentin floor and rapidly progressed along the cavity floor. The timing, rate, and extent of gap formation were different among the specimens. From 3D visualization, gap progress could be seen on both enamel and dentin even after irradiation; furthermore, typical toroidal gap patterns appeared at the dentin floor of BF and SBU. XTR and SE2 showed nearly perfect sealing performance on the dentin floor up to the 10 min that images were recorded. From quantitative analysis, SE2 and XTR showed significantly higher E% and D% than other groups. SBU showed the smallest E% and BF showed a significantly smaller D% than other groups ( P < 0.05). In conclusion, real-time observation of composite placement and 3D quantification of interfacial gaps were implemented within the experimental limitations. Interfacial gap formation during polymerization of the composite depended on the adhesive system used. The formed gaps continued to propagate after composite light curing finished.
Formation of Fluorohydroxyapatite with Silver Diamine Fluoride
Authors: Mei M.L. , Nudelman F. , Marzec B. , Walker J.M. , Lo E.C.M. , Walls A.W. , Chu C.H.
Published: May 2017

Silver diamine fluoride (SDF) is found to promote remineralization and harden the carious lesion. Hydroxyapatite crystallization is a crucial process in remineralization; however, the role of SDF in crystal formation is unknown. We designed an in vitro experiment with calcium phosphate with different SDF concentrations (0.38, 1.52, 2.66, 3.80 mg/mL) to investigate the effect of this additive on the nucleation and growth of apatite crystals. Two control groups were also prepared—calcium phosphate (CaCl2·2H2O + K2HPO4 in buffer solution) and SDF (Ag[NH3]2F in buffer solution). After incubation at 37 oC for 24 h, the shape and organization of the crystals were examined by bright-field transmission electron microscopy and electron diffraction. Unit cell parameters of the obtained crystals were determined with powder X-ray diffraction. The vibrational and rotational modes of phosphate groups were analyzed with Raman microscopy. The transmission electron microscopy and selected-area electron diffraction confirmed that all solids precipitated within the SDF groups were crystalline and that there was a positive correlation between the increased percentage of crystal size and the concentration of SDF. The powder X-ray diffraction patterns indicated that fluorohydroxyapatite and silver chloride were formed in all the SDF groups. Compared with calcium phosphate control, a contraction of the unit cell in the a-direction but not the c-direction in SDF groups was revealed, which suggested that small localized fluoride anions substituted the hydroxyl anions in hydroxyapatite crystals. This was further evidenced by the Raman spectra, which displayed up-field shift of the phosphate band in all the SDF groups and confirmed that the chemical environment of the phosphate functionalities indeed changed. The results suggested that SDF reacted with calcium and phosphate ions and produced fluorohydroxyapatite. This preferential precipitation of fluorohydroxyapatite with reduced solubility could be one of the main factors for arrest of caries lesions treated with SDF.
Implementing Instructional Practices to Improve American Indian and Alaska Native Students’ Reading Outcomes: An Exploration of Patterns Across Teacher, Classroom, and School Characteristics
Authors: Vincent Claudia , Tobin Tary , Van Ryzin Mark
Published: May 2017

The Native Community strongly recommends integrating Native language and culture (NLC) into reading instruction to improve outcomes for American Indian/Alaska Native (AI/AN) students. However, little is known about the extent to which recommended practices are used and what might facilitate their implementation. The National Indian Education Study conducted by the U.S. Department of Education surveys teachers of AI/AN students on their instructional practices. This descriptive study builds on previous analysis of survey data, which identified measurable dimensions of NLC in instruction. We now examine (a) the extent to which teachers implement these dimensions and (b) what teacher, classroom, and schoolwide characteristics facilitate implementation. Outcomes suggest that the recommended practices are rarely implemented, and that AI/AN teachers speaking Native language(s) and teaching in classrooms with high AI/AN enrollment located in schools employing AI/AN teachers and staff implement the recommended practices more often. We discuss implications for teacher education and support.
Changing girlhoods – Changing Girl Guiding
Authors: Halls Amy , Uprichard Emma , Jackson Clare
Published: May 2017

This article discusses the changing nature of girlhood over the last century as it is depicted through an empirical study of all editions of Girl Guide handbooks since 1910. The article describes three strands of change, which we describe as ‘stringy’, insofar as they are co-occur together and are difficult to untangle from one another; yet they are also stories of change that are nevertheless visible as strands in and of themselves through the empirical material. We illustrate the importance of incorporating children and childhood into more general theories of social change, in order to better understand how they are intrinsic to the mechanisms of intergenerational change.
Ability and Prior Distribution Mismatch: An Exploration of Common-Item Linking Methods
Authors: LeBeau Brandon
Published: May 2017

Linking of two forms is an important task when using item response theory, particularly when two forms are administered to nonequivalent groups. When linking with characteristic curve methods, the ability distribution and weights associated with that distribution can be used to weight observations differently. These are commonly specified as equally spaced intervals from −4 to 4, but other options or distributional forms can be specified. The use of these different distributions and weights of the ability distributions will be explored with a Monte Carlo simulation. Primary simulation conditions will include sample size, number of items, number of common items, ability distribution, and randomly varying population transformation constants. Study results show that the linking weights have little impact on the estimation of the linking constants; however, the underlying ability distribution of examinees does have significant impact. Implications for applied researchers will be discussed.
Employed Women and Marital Union Stability: It Helps When Men Help
Authors: Mencarini Letizia , Vignoli Daniele
Published: May 2017

A new strand of studies has called into question standard microeconomic predictions of a positive association between women’s economic independence and marital union dissolution. We investigate whether and how the gender division of labor channels the impact of women’s employment on marital union disruption, utilizing data on heterosexual couples from the 2003 and 2007 waves of the Italian nationally representative “Family and Social Subject” survey ( N = 2,871) and applying techniques of mediation analysis. We suggest that women’s employment does not have a negative effect per se on union stability, and that women’s paid work becomes detrimental to the stability of the union only if the men’s contribution to unpaid work is limited.
“Linkedin Is My Office; Facebook My Living Room, Twitter the Neighborhood Bar”
Authors: LaPoe Victoria L. , Carter Olson Candi , Eckert Stine
Published: May 2017

This study grounds 45 interviews with media scholars in liminality theory and analyzes how scholars use social media as they transition to combined offline and online communication. Scholars employ highly personal strategies to decide if and how to integrate social media into their professional lives for peer and public communication. Scholars struggle with a double bind of needing to be social media savvy while worrying about career consequences of posting publicly. Few best practices exist.
Design and implementation of a novel architecture for physical human-UAV interaction
Authors: Rajappa Sujit , Bülthoff Heinrich , Stegagno Paolo
Published: May 2017

Interaction between humans and unmanned aerial vehicles is a promising field for future applications. However, current interfacing paradigms either imply the presence of intermediary hardware as monitors, joysticks and haptic devices, or are limited to visual/auditory channels with hand gestures, voice recognition, or interpretation of face poses and body postures. Another paradigm, physical human–robot interaction, which is based on mutual exchange of forces, is popular when dealing with robotic arms and humanoids, while unmanned aerial vehicles are usually considered too dangerous and lack proper interaction surfaces to exchange forces. In this paper, we address the problem of physical human–unmanned aerial vehicle interaction and we propose a straightforward approach to allow a human to intuitively command an unmanned aerial vehicle through exchanges of forces. Using a residual based estimator, we estimate the external forces and torques acting on the unmanned aerial vehicle. Through the employment of a sensor ring, we are able to separate the human interaction forces from additional disturbances as wind and parameter uncertainties. This knowledge is used inside a control framework where the human is allowed to change the desired trajectory by simply applying forces on the unmanned aerial vehicle. The system is validated with multiple hardware-in-the-loop simulations and experiments in which we try different interaction modalities.
Development and evaluation of two brief group interventions for music performance anxiety in community musicians
Authors: Kenny Dianna T. , Halls Naomi
Published: May 2017

This study presents the development, administration and evaluation of two brief group interventions for music performance anxiety (MPA) aimed at reducing anxiety and improving performance quality. A cognitive behavioural therapy intervention was developed based on an existing empirically-supported treatment Chilled (Rapee et al., 2006), focusing on cognitive, physiological and behavioural symptoms. The second treatment, anxiety sensitivity reduction, targeted primarily physiological symptoms and included relaxation strategies. Interventions were administered in a workshop format over one day with four intervention sessions, preceded by a pedagogic practice skills session that functioned as a control/placebo intervention. A quasi-experimental group randomization design compared the interventions in a heterogeneous sample of community musicians. Sixty-eight participants completed measures of trait anxiety, anxiety sensitivity, depression, and MPA. Participants performed four times (pre- and post-placebo, post-treatment and follow-up) and were assessed for state anxiety and performance quality at each performance. Results indicated that both interventions offered moderately significant gains for the musicians: anxiety was reduced and performance quality improved after each intervention and changes were maintained at follow-up. Anxiety sensitivity reduction showed a trend to exceed the CBT-based interventions, but a larger, higher-powered study is needed to confirm this advantage.
Self-affirmation improves music performance among performers high on the impulsivity dimension of sensation seeking
Authors: Churchill Susan , Jessop Donna C. , Goodwin Sophie , Ritchie Laura , Harris Peter R.
Published: May 2017

In the light of evidence that self-affirmation can mitigate the negative effects of stress on outcomes, this study tested whether a self-affirmation manipulation could improve undergraduate students’ achievement in a formal musical performance examination. The study also investigated the association between impulsivity and music performance and explored whether impulsivity moderated any impact of self-affirmation on exam performance. At baseline, participants provided demographic information and completed the UPPS-P Impulsive Behaviour Scale (short-form), which assesses five dimensions of impulsivity (negative and positive urgency, lack of premeditation, lack of perseverance, and sensation seeking). In the subsequent 14 days, participants ( n = 65) completed either a self-affirmation manipulation or a control task, before reading a message about the impact of practice on music performance. Music performance was formally assessed 14 days later. Sensation seeking was the only dimension of impulsivity associated with exam performance, with participants high in sensation seeking receiving lower grades. Critically, self-affirmation promoted better music performance among those high in sensation seeking. Self-affirmation may provide a useful intervention to augment the performance of musicians who would otherwise perform worse than their counterparts under formal evaluative circumstances, such as those high in sensation seeking.
Analyzing wind speed data and wind power density of Tetouan city in Morocco by adjustment to Weibull and Rayleigh distribution functions
Authors: Ouahabi Mohamed Hatim , Benabdelouahab Farid , Khamlichi Abdellatif
Published: May 2017

Several statistical distributions have been considered to model wind speed data. However, Weibull and Rayleigh statistical distributions are the most widely used methods for analyzing wind speed measurements and determining wind energy potential. In this work, these statistical distributions were applied in order to evaluate the wind resources in the northern Moroccan city of Tetouan. Adjustment of wind measurement data was performed. Then, the obtained results were compared with the provided wind data to test their accuracy based on common statistical indicators for performance. It was found that the Weibull and Rayleigh distribution models provide adequate description of the frequencies of actual wind records in Tetouan. They can be advantageously used to assess wind resource characteristics in this region.
How scientific research instruments change: A century of Nobel Prize physics instrumentation
Authors: Marcovich Anne , Shinn Terry
Published: May 2017

This article explores structures of intellectual, operational and institutional transformations of scientific research instrumentation in the 20th century. The study of 26 Nobel Prizes in physics instrumentation between 1901 and the present yields abundant and systematic information related to change and stability of instrument function, instrument trajectory and the social organization of instrument-related work. This yields three configurations: ‘bounded’, ‘extensionist’ and ‘linked’. One can observe for the late 20th century the emergence of an unprecedented form of instrumented-related cognitive operation that we dub ‘instrument knowledge’.
Doing Sexual Responsibility: HIV, Risk Discourses, Trust, and Gay Men Interacting Online
Authors: Robinson Brandon Andrew
Published: May 2017

This study draws from interviews with HIV-negative gay men to show how they are doing sexual responsibility online and how their actions uphold moralizing discourses around HIV. The analysis shows how gay men often engage in boundary work through stating their HIV status and “safe sex” practices on their online profile and through screening other people’s profiles for similar information. The gay men also avoid interactions with HIV-positive people, maintaining the stigmatization of HIV-positive people and constructing an HIV-positive serostatus as a status distinction. However, although the HIV-negative gay men are often invested in doing sexual responsibility, they eschew condom use with people they trust. This study then demonstrates the limitations and unintended consequences of discourses that often focus on risk and individual responsibility. These discourses ignore the relational and emotive components of sexual interactions, and hence fail to capture the complexities of people’s lives.
The effect of sexual violence on negotiated outcomes in civil conflicts
Authors: Chu Tiffany S , Braithwaite Jessica Maves
Published: May 2017

Combatants used sexual violence in approximately half of all civil conflicts since 1989. We expect that when groups resort to sexual violence they are organizationally vulnerable, unlikely to win, and as such they are inclined to salvage something from the conflict by way of a settlement. Using quantitative analysis of data on civil conflicts in the post-Cold War period, we find that a higher prevalence of sexual violence perpetrated by government forces precipitates negotiated outcomes. This is particularly true in contexts where both government and rebel forces utilize comparable levels of wartime rape and other forms of sexual abuse.
Painting too “Rosie” a picture: The impact of external threat on women’s economic welfare
Authors: Tir Jaroslav , Bailey Maureen
Published: May 2017

Why is the economic status of women better in one country than another? We maintain that the answer lies in part in the extent of external threat to the homeland territory a country faces. To respond to the threat, states centralize their decision-making, invest more in the military and decrease citizens’ liberties. Associated restrictions and emphases on more “masculine” values create an environment where women’s welfare takes a back seat to the ostensible priority of defending the homeland. Utilizing measures of women’s unemployment from across the world, 1981–2001, we demonstrate that higher levels of territorial threat decrease women’s economic welfare.
The social origins of female combatants
Authors: Thomas Jakana L , Wood Reed M
Published: May 2017

We investigate the factors that lead some rebel organizations to deploy women in combat roles while others restrict women’s participation to non-combat roles or exclude them entirely. Our argument focuses on the influence of the scope and frequency of women’s prior participation in social, political, and economic activities on groups’ decisions to employ women in combat roles and women’s desire to pursue such roles when they are made available. We evaluate our hypotheses using a new dataset on women’s combat participation in rebel movements active from 1979 to 2009. Our results provide support for our central hypothesis.
The internationalization of security sector gender reforms in post-conflict countries
Authors: Huber Laura , Karim Sabrina
Published: May 2017

With the passing of several UN Security Council Resolutions related to Women, Peace and Security, gender balancing security sector reforms (SSR)—or policies that ensure the equal participation of women in the security sector—have received increased global attention over the past two decades. However, to date, there is no explanation for variation in their adoption. This paper examines the internationalization of SSR gender reform, arguing that the presence of a peacekeeping mission within a post-conflict country affects the state’s resources and political will to adopt gender balancing reforms. We explore the effect of multidimensional peacekeeping using an original dataset on SSR in post-conflict countries, the Security Sector Reform Dataset, from 1989 to 2012. We find that peacekeeping missions increase the probability that a state will adopt gender balancing reforms in SSR. As the first cross-national quantitative examination of gender balancing reforms, these findings also shed light on the conditions under which states adopt security sector reforms more generally.
The effect of carbon nanoparticles on biological properties of polyester nanocomposites
Authors: Staniszewski Zygmunt , Piegat Agnieszka , Okroj Wieslawa , Walkowiak-Przybylo Magdalena , Jakubowski Witold , Walkowiak Bogdan , Budner Boguslaw , Mroz Waldemar , Sobolewski Peter , El Fray Miroslawa
Published: May 2017

The aim of present study was to determine the hemocompatibility, cellular response of endothelial cells and bacterial adhesion to a new polyester nanocomposite. The carbon nanoparticle nanocomposite was prepared via in situ polymerization of monomers to obtain material of hardness 55 Sh D similar to polyurethanes used in medical applications, for example, in heart-assisting devices. The carbon nanoparticle-containing polyester exhibits markedly reduced bacterial colonization, as compared to commercially available polyurethanes. Further the nanocomposite possesses markedly improved hemocompatibility, as determined by flow cytometry, and robust endothelialization. Possible explanations for these beneficial properties include surface nanoroughness of carbon nanoparticle-containing nanocomposites and presence of fatty acid sequences within polymer structure.
“If She Refuses to Have Sex With You, Just Make Her Tipsy”: A Qualitative Study Exploring Alcohol-Facilitated Sexual Violence Against Nigerian Female Students
Authors: Dumbili Emeka W. , Williams Clare
Published: May 2017

Most research on alcohol consumption and related sexual violence focuses on Western societies. Drawing on traditional masculinity scripts, this article contributes to the culturally specific understanding of how Nigerian sociocultural constructions of alcohol consumption facilitate sexual violence against women. In-depth interviews were conducted with 31 male and female undergraduate students (aged 19-23 years), exploring how the gendering of alcoholic beverages facilitates men’s perpetration of sexual violence against women in a Nigerian university. Thematic analysis was conducted using NVivo 10 software. Men were found to exclude women from consuming beer, which they described as “inappropriate” feminine behavior, confining them to drinking sweetened/flavored alcoholic beverages. To maintain a notion of “respectable” femininity, women consumed these drinks, but this created gender-specific risks. In comparison with beer, sweetened alcoholic beverages have a higher alcohol content, which many of the men were aware of, unlike the women interviewed. Some men admitted buying such drinks for women, pressuring them to drink above their limits and raping them when they were inebriated. Public health interventions that focus on the deep-seated gendered consumption rituals anchored in patriarchal beliefs, the commodification of women’s bodies, and the stigmatization of rape victims should be pursued more vigorously in Nigeria and other non-Western societies.
Enzymatic modification of jute fabrics for enhancing the reinforcement in jute/PP composites
Authors: Dong Aixue , Li Fan , Fan Xuerong , Wang Qiang , Yu Yuanyuan , Wang Ping , Yuan Jiugang , Cavaco-Paulo Artur
Published: May 2017

In this work, laccase was employed to improve the properties of lignocellulosic jute fabrics and then the modified jute was used as the fiber reinforcement of polypropylene (PP) matrix composites to improve its reinforcing effect on the polymer resins and obtain composite materials with better performance. The decrease in the –C–O–H component and the increase in the –C–O–C component on the surface of laccase-treated jute fabrics suggested that phenolic hydroxyl groups of lignins on the jute fiber surface were oxidized by laccase and the produced phenoxyl radicals were coupled to form ether structures. The laccase-treated jute fiber surface became smooth with lignins attached tightly. Moreover, the surface hydrophobicity and tensile properties of the jute fabrics were increased via the laccase-mediated reactions of lignins. PP composites reinforced by the laccase-treated jute fabrics showed higher breaking strength, storage modulus, and melting temperature than the control. The fracture surface of the laccase-treated jute fabric/PP composites was neat and jute fibers on the section surface were surrounded by PP resins closely, which indicated better interfacial adhesion between the modified jute reinforcement and PP matrix.
The idea of policy design: Intention, process, outcome, meaning and validity
Authors: Colebatch HK
Published: May 2017

While policy design is a relatively recent term in the social science literature, the concept itself is ancient. The modernist incarnation, from the mid-20th century onwards, is grounded in the applied social sciences: the systematic calculation of problems, values, practices and outcomes. But in many ways, the confidence of the faith in systematic design was not borne out by experience. It became clear that rather than finding expert designers advising authoritative decision-makers and perhaps monitoring the activities of subordinate ‘implementers’, the world of policy was populated by multiple participants in distinct organisational locations, with divergent framings, continuing negotiation on practice, and ambiguity in the understanding of outcomes. There is clearly a tension between the image of policy design and the experience of the activity. The response to this tension in the literature on policy design has largely been aimed at reconciling the experience of practice with the norms of instrumental rationality. It has tended to give little attention to the interpretive significance of ‘design talk’ in the process of governing. This paper argues that ‘policy design’ is an exercise in giving meaning – framing activity in a way that makes practices and outcomes appropriate and valid – and develops a more comprehensive analysis of ‘policy design’ as a concept in use in both policy practice and the analysis of that practice.
Heat dissipation from a stationary brake disc, Part 1: Analytical modelling and experimental investigations
Authors: Stevens Kevin , Tirovic Marko
Published: May 2017

The main aim of the research is to support the development of the commercial vehicle electric parking brake. Though nowadays widely used on passenger cars, electric parking brake applications on commercial vehicles present completely different challenges. With the brake mass, thermal capacity and required clamp forces an order of magnitude higher, safe parking demands much more attention. In the first instance, the priority is placed upon predicting heat dissipation from the brake disc only. The research is presented in two parts; part one (presented here) focuses on analytical modelling and experimental verification of predicted disc temperatures over long cooling periods, with part two investigating the air flow, velocities and convective heat transfer coefficients using computational fluid dynamics modelling, also followed by experimental validations. To begin the analytical analysis, a study was conducted into the variance in mean local convective heat transfer coefficients over a simplified brake disc friction surface, by investigating typical dimensionless air properties. A nonlinear equation was derived for the average surface convective heat transfer coefficient ([Formula: see text]) variability with temperature drop for the entire cooling phase. Starting from fundamental principles, first-order differential equations were developed to predict the bulk disc temperature. By including variation of the convective and radiative heat dissipation throughout the cooling period, a good correlation was achieved with measured values, to within 10%. Experiments were conducted on a specifically designed thermal rig which uses 15 kW induction heater to heat the disc. Numerous experiments proved the results are very repeatable, throughout the cooling period. It was established, for the grey cast iron brake disc with a fully oxidised surface, the emissivity value are practically constant at ɛ = 0.92. Although the research is being conducted on a brake disc, the results have generic application to any disc geometry, whatever the application.
Coupled thermo-electro-mechanical analysis of sandwiched hybrid functionally graded elastic material and piezoelectric plates under thermal loads
Authors: Wu Chih-Ping , Ding Shuang
Published: May 2017

Based on Reissner’s mixed variational theorem, a weak-form formulation of finite layer methods is developed for the three-dimensional coupled thermo-electro-mechanical analysis of simply-supported, functionally graded elastic material plates integrated with surface-bonded piezoelectric layers and under thermal loads. The material properties of the functionally graded elastic material core are assumed to obey the power-law distributions varying through-the-thickness coordinate of the core according to the volume fractions of the constituents, and those of the functionally graded elastic material core and piezoelectric face sheets are also temperature dependent. The effective material properties of the functionally graded elastic material are estimated using the Mori-Tanaka scheme. Two different thermal conditions, i.e. the convection conditions and specified temperature conditions, on the top and bottom surfaces of the plate are considered. The accuracies and convergence rates of the finite layer methods with various orders used for expanding the elastic and electric variables in the thickness direction are assessed by comparing their solutions with the exact three-dimensional ones available in the literature.
Bioethical analysis to the therapeutic use of Cannabis: Integrative review
Authors: Vasconcelos Selene Cordeiro , Silva Antonia Oliveira , Moreira Maria Adelaide Silva Paredes , Correia Analine de Souza Bandeira , Guerra Ana Luisa Antunes Gonçalves , Santos Adrielle Rodrigues dos , Frazão Iracema da Silva
Published: May 2017

Introduction:

Despite being considered as a contravention under some countries’ legislation, the therapeutic use of Cannabis sativa has been growing in Brazil, due to the promising results observed in many pathologies. Such a scenario has fostered the need to deepen discussions on the subject and possibly revise legislation governing the substance use and access.

Objectives:

Identify the types of stigma related to the therapeutic use of Cannabis and describe the strategies people use to overcome stigma.

Methods:

This integrative review was carried out in the databases PubMed, Scopus, CINAHL, MEDLINE, PsycINFO, Web of Science, and Cochrane Library, with 565 articles being retrieved. Triads’ cross-check were done, first maintaining the “cannabis” and “therapeutic use” pair, added by “stigma,” “bioethics,” “ethics,” “social consequences,” and “legal consequences.” The final selection resulted in six articles.

Ethical Consideration:

However, the ethical issues that pervade and regulate decisions on this subject must be considered.

Results:

Different dimensions and types of stigma related to the therapeutic use of Cannabis have been identified. The bioethical principle of autonomy was an expression of citizenship and human rights, mitigating internal conflicts related to self-stigma and the effects of external stigma on the person’s life.

Conclusion:

It was possible to identify the types of stigma related to the therapeutic use of Cannabis is an internal dimension represented (self-stigma) and an external dimension, represented (social and structural stigmas) and to identify strategies adopted to face this stigma: skills training group for users, elaboration of laws and specific programs to clarify the therapeutic use of Cannabis with a greater social scope, and support for family members. Thus, contributing to the building of people’s autonomy in a broader context of decision-making autonomy and executive autonomy will provide the development of people’s capacity to perform complex tasks of self-management and, consequently, to continue promoting and preserving their decision-making process and their capacity to plan and perform tasks associated with managing their lives and their treatments.
Tunable friction performance of magneto-rheological elastomer induced by external magnetic field
Authors: Li Rui , Ren Dejun , Wang Xiaojie , Chen Xiang , Chen Shiwei , Wu Xuan
Published: May 2017

In order to investigate the magnetic-induced friction properties of magneto-rheological elastomers, isotropic and anisotropic magneto-rheological elastomers are fabricated, tribological testing setup is built, and the friction experiment is carried out. The experimental results show that the isotropic magneto-rheological elastomer has a decreasing friction coefficient with magnetic field applied, which is also affected by particle volume fraction. The influence of magnetic field on friction coefficient of the anisotropic magneto-rheological elastomers is not monotonic. The experimental results also show that the friction coefficient of magneto-rheological elastomers decreases with the increase in load for both isotropic and anisotropic magneto-rheological elastomers in most circumstances. The volume fraction of carbonyl iron powders being around 10% is the best for magneto-rheological elastomers in tuning friction. The tunable range of friction could be as high as 25% under a magnetic field of 0.25 T. Images of the magneto-rheological elastomer interfaces show that the surface roughness is reduced by about 20.7% when a magnetic field of 0.5 T is applied. The aggregation phenomenon is observed on the surface of the magneto-rheological elastomer under a magnetic field. On the basis of three-dimensional surface topography, a preliminary model for the aggregation of micro asperities on the surface of the magneto-rheological elastomer is built to interpret the influence of the magnetic field on the tribological properties of magneto-rheological elastomers.
Nudging for Prevention in Occupational Health and Safety in South Africa Using Fiscal Policies
Authors: de Jager Pieter , Rees David , Kisting Sophia , Kgalamono Spo , Ndaba Mpume , Stacey Nicolas , Tugendhaft Aviva , Hofman Karen
Published: May 2017

Currently, in some countries occupational health and safety policy and practice have a bias toward secondary prevention and workers’ compensation rather than primary prevention. Particularly, in emerging economies, research has not adequately contributed to effective interventions and improvements in workers’ health. This article, using South Africa as a case study, describes a methodology for identifying candidate fiscal policy interventions and describes the policy interventions selected for occupational health and safety. It is argued that fiscal policies are well placed to deal with complex intersectoral health problems and to focus efforts on primary prevention. A major challenge is the lack of empirical evidence to support the effectiveness of fiscal policies in improving workers’ health. A second challenge is the underprioritization of occupational health and safety partly due to the relatively small burden of disease attributed to occupational exposures. Both challenges can and should be overcome by (i) conducting policy-relevant research to fill the empirical gaps and (ii) reconceptualizing, both for policy and research purposes, the role of work as a determinant of population health. Fiscal policies to prevent exposure to hazards at work have face validity and are thus appealing, not as a replacement for other efforts to improve health, but as part of a comprehensive effort toward prevention.
Higher-order approximate steady-state solutions for strongly nonlinear systems by the improved incremental harmonic balance method
Authors: Niu Jiangchuan , Shen Yongjun , Yang Shaopu , Li Sujuan
Published: May 2017

Combining the harmonic balance method with the incremental harmonic balance approach, an improved incremental harmonic balance method is presented to obtain the higher-order approximate steady-state solutions for strongly nonlinear systems, which can simplify the calculation process for high-order nonlinear terms. Taking a strongly nonlinear Duffing oscillator with cubic nonlinearity and a strongly nonlinear Duffing oscillator with quintic nonlinearity as examples, the forced vibrations under harmonic excitation are investigated. Based on the first-order approximate analytical solutions obtained by the harmonic balance method, the higher-order approximate solutions are obtained by the improved incremental harmonic balance method. The correctness of the approximate analytical results is verified by the numerical results. The comparison results show that the approximations obtained by the improved incremental harmonic balance method agree with the numerical solutions well, and the improved method is effective to analyze the dynamical response for strongly nonlinear systems.
After the Stop: Exploring the Racial/Ethnic Disparities in Police Use of Force During Terry Stops
Authors: Morrow Weston J. , White Michael D. , Fradella Henry F.
Published: May 2017

Questions surrounding stop, question, and frisk (SQF) practices have focused almost exclusively on racial and ethnic disproportionality in the rate of stops, and whether police are engaged in racial profiling. This near-sole focus on the stop decision has overshadowed important questions about the use of force during Terry stops, resulting in a major gap in our understanding of the dynamics of SQF encounters. The current study addresses this issue through an examination of the nature, prevalence, and predictors of use of force during Terry stops using the 2012 SQF database of New York Police Department (NYPD; N = 519,948) and data from the U.S. Census Bureau. Results indicate that use of force was an infrequent event in NYPD stops (14%), and weapon force was quite rare (.01%). However, hierarchical multinomial logistic regression models show that Black and Hispanic citizens were significantly more likely to experience non-weapon force than White citizens, while controlling for other relevant situational and precinct-level variables. The findings suggest that minority citizens may be exposed to a racial or ethnic “double jeopardy,” whereby they are subjected to both unconstitutional stops and disparate rates of force during those stops. The study highlights the importance of expanding the focus on SQF beyond the racial profiling lens, as questions about the dynamics of police use of force decision-making raise equally important social and legal concerns.
The end into the beginning: Prolepsis and the reconstruction of the collective past
Authors: Brescó de Luna Ignacio
Published: May 2017

Prolepsis – or the narrative manoeuver consisting of narrating or evoking a future event in advance – is a concept borrowed from literary theory that has been used in Psychology for studying the contribution of culture and meaning to development. Cole applies the notion of prolepsis to upbringing insofar as parents’ imagined goals vis-à-vis their offspring guide their educational childrearing, thus channelling the child’s present towards the parents’ imagined future. This view coincides with cultural psychology in that humans are considered as future-oriented beings, constructing cultural tools that mediate the way we interpret the world and act within it. Drawing from this theoretical framework, this paper applies the notion of prolepsis to collective memory in order to examine how imagined futures are brought into the present by means of particular ways of reconstructing the past, thus mobilizing collectives towards certain political goals. Along these lines, the narrative, pragmatic and normative dimensions of collective memory are discussed. The paper concludes with some reflections on the role of politics of imagination in promoting different ways of relating past, present and future.
The role of collective memory in protracted conflict
Authors: Nicholson Cathy
Published: May 2017

This paper examines the role of interpretations of historical events when discussing the Israeli–Palestinian conflict, by those with a lived experience of it. The research literature relating to representations of collective memory and perceived intractable conflict is presented before discussing how a theoretical lens of dialogicality, through exploring the role of themata, can add to the discussion. Open-ended depth interviews with both Palestinians and Jewish Israelis revealed historical narratives without any direct questioning concerning this. Subsequent thematic analysis demonstrated the significance of these to justify and legitimise their positioning frameworks in relation to both their own and the others group's perspectives. The subsequent discussion examines how the quoted examples of perceived interpretations of the past can offer an understanding of foundational themes that remain omnipresent, yet not exclusive. Social representations of collective memories can play a significant role in the discussion of protracted conflict where frozen representations of the past can act as barriers to change, yet as will be discussed, resistance to them can lead to new perspectives that herald a shift away from a perceived intractability towards an alternative, more collaboratively imagined future.
Therapeutic alliance in youth with autism spectrum disorder receiving cognitive-behavioral treatment for anxiety
Authors: Kerns Connor M , Collier Amanda , Lewin Adam B , Storch Eric A
Published: May 2017

Symptoms of autism spectrum disorder may influence alliance in psychotherapy. This study examined therapeutic alliance and its relationship with child characteristics and anxiety treatment outcomes in youth with autism spectrum disorder. Youth ( N = 64) with autism spectrum disorder and co-occurring anxiety (7–16 years, IQ > 70) received 16 sessions of modular cognitive-behavioral therapy. Post-treatment therapist, youth and parent ratings of alliance as well as pre- and post-treatment ratings of child behavior were gathered. Ratings of alliance were commensurate to ratings seen in children without autism spectrum disorder. Measures of treatment outcome, but not pretreatment characteristics, were significantly associated with therapist ratings of alliance strength. Data suggest that therapeutic alliance may not be impaired in anxious youth with autism spectrum disorder and may be associated with treatment outcome.