Urban transportation network analysis from a thermodynamic perspective

The paper explores the application of thermodynamic formalism to model and control transportation networks. Specifically, by considering the vehicles as the abstract energy supplied to the system, we show in certain circumstances that certain thermodynamic concepts such as temperature, thermal capacity and thermal equilibrium can have the corresponding notions in transportation context. In addition, despite the lack of a natural principle in transportation context that corresponds to the second law of thermodynamic as we will show, the most important thermodynamic notion, which is the entropy, can be also defined in order to measure the disorder of transportation systems. It is then shown that the state when all lanes have the same occupancy corresponds to the thermal equilibrium arising in isolated thermodynamic system. This equilibrium occupancy leads to a minimum entropy corresponding to a minimal disorder. Besides, by taking the transportation entropy as the storage function, a robust dissipativity based control strategy is presented to reduce the disorder and render the system better organized. Finally, an example is worked out to illustrate the results.     

The influence of history of science courses on students' views of nature of science

This study (a) assessed the influence of three history of science (HOS) courses on college students' and preservice science teachers' conceptions of nature of science (NOS), (b) examined whether participants who entered the investigated courses with a conceptual framework consistent with contemporary NOS views achieved more elaborate NOS understandings, and (c) explored the aspects of the participant HOS courses that rendered them more “effective” in influencing students' views. Participants were 166 undergraduate and graduate students and 15 preservice secondary science teachers. An open‐ended questionnaire in conjunction with individual interviews, was used to assess participants' pre‐ and postinstruction NOS views. Almost all participants held inadequate views of several NOS aspects at the outset of the study. Very few and limited changes in participants' views were evident at the conclusion of the courses. Change was evident in the views of relatively more participants, especially preservice science teachers, who entered the HOS courses with frameworks that were somewhat consistent with current NOS views. Moreover, explicitly addressing certain NOS aspects rendered the HOS courses relatively more effective in enhancing participants' NOS views. The results of this study do not lend empirical support to the intuitively appealing assumption held by many science educators that coursework in HOS will necessarily enhance students' and preservice science teachers' NOS views. However, explicitly addressing specific NOS aspects might enhance the effectiveness of HOS courses in this regard. Moreover, the study suggests that exposing preservice science teachers to explicit NOS instruction in science methods courses prior to their enrollment in HOS courses might increase the likelihood that their NOS views will be changed or enriched as a result of their experiences with HOS. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 1057–1095, 2000     

Bridging identities through religious television contents: Javanese female descendants,Islamic viewing and Malay identity projection

This study explores the uses of Islamic television content in bridging the gap between Javanese and Malay identity among the Malay women of Javanese descent in Malaysia. Malaysian religious television programmes have constantly promoted the Islamic identifications of Malayness, enabling the Malay audience to reconstruct the culturally religious identity. While the reconstruction of Islamic identity through television viewing simply represents a lived experience for the majority of the Malay society, it has some cultural meanings for certain Malay sub-ethnic communities, such as the Javanese. This ethnographic study on a Malaysian Javanese community reveals that the interpretive engagement of this particular community in Islamic television viewing serves the purpose of negotiating Malay identity. The results of this study suggest that religious content can serve as an engaging platform to construct multi-ethnic identities beside popular and ethnic-related contents.     

Dialed In: Continuous Response Measures in Televised Political Debates and Their Effect on Viewers

As a result of emerging debate formats and technological advancements over the years, the media started using continuous response measures (CRMs) in the form of on-screen trackers, allowing select audiences to rate candidate performances in political debates in 2004. Given the limited amount of scholarly research that has tackled this issue, this study aims to investigate the effect of CRMs on college students’ voting choices and perceptions of political candidates. This experimental study has found that these trackers did influence the participants’ evaluations of the political candidates shown in the debate regardless of previously stated political affiliation.     

“Growing together”: A Latvian retrospective of learning opportunities created in the cooperation among Nordic and Baltic adult educators

This article tells the extraordinary story of the cooperation among adult educators in five Nordic and three Baltic countries (NB8) which began in 1991 – the year when Latvia regained its independence. According to individuals who experienced the evolution of this cooperation from the beginning and were actively involved in the process of developing contemporary theories, policies and practices of adult education in Latvia, this cooperation resulted in the creation of a range of unique opportunities for learning and development. Latvian adult educators were engaged in many activities; they learned themselves, taught others, did research on adult education and developed a new system of adult education. What had started out as a “donorship” grew into a “partnership”. With hardly any published information about this cooperation to rely on, the authors of this article build their case using (1) their own memories of participation; (2) the information gained through interviews with key experts; and (3) a number of largely unpublished documents indicated in these interviews. Tracing the evolution of this cooperation, their study seeks to understand how learning opportunities were created and how they were used by adult educators in Latvia. Adopting an ecological (in terms of learning environment, relationships, agency, motivation and identity) sociocultural perspective on learning and learning opportunities, the authors analyse the quality of the learning opportunities created in the context of Nordic-Baltic cooperation, aiming to identify what makes international cooperation successful.     

Hyperhydration using different hydration agents does not affect the haematological markers of the athlete biological passport in euhydrated volunteers

ABSTRACT

Athlete Biological Passport (ABP) is an indirect approach, implemented by WADA, aimed at detecting blood manipulation based on abnormal changes in haematological markers. Cases report the use of hyperhydration as masking method during anti-doping urine sample collection which could potentially mask suspicious fluctuations on ABP profiles. This study investigated the hyperhydration effect on haemoglobin concentration, reticulocyte percentage and OFF-hr score (an algorithm based on haemoglobin concentration and reticulocyte percentage), with and without recombinant human erythropoietin (rHuEPO) administration. A five-week clinical study performed; Baseline and rHuEPO Phase. Water and a sports drink were used as hyperhydration agents. To examine the hyperhydration effect on the normal ABP profile per volunteer, hyperhydration was implemented at 0, 24 and 48 hours during the baseline. During the rHuEPO phase, volunteers received Epoetin beta (3000 IU) with hyperhydration to be implemented at 0, 24 and 48 hours after drug administration. Blood and urine samples were collected and analysed according to WADA guidelines. No significant effect on ABP markers was observed due to hyperhydration at any time during the study. Pre- and post-hyperhydration data were not statistically different compared to individual baseline data. In conclusion, hyperhydration does not affect the ABP haematological markers under the examined conditions.     

The ‘[h]unt for new Canadians begins in the classroom*’: the construction and contradictions of Canadian policy discourse on international education

In Canada’s first-ever strategy, international education (IE) is linked to immigration policy with international students (IS) recruited as ‘ideal’ immigrants. This paper engages in policy sociology and Ball's concepts of 'policy as text' and 'policy as discourse' (10). It follows three stages of critical policy discourse analysis. The first a simple tally of the most commonly used words/phrases in the Strategy; the second analyses it using Van Leeuwen’s framework and the third presents results from a study on the perception and experiences of IS, exposing the gap between policy rhetoric and practice. The paper concludes that critical discourse analysis is a powerful tool to uncover policy values/ideologies, identify legitimation strategies and reveal perpetuation of power relations/status quo within Canadian society.     

Polymorphisms within the COL5A1 gene and regulators of the extracellular matrix modify the risk of Achilles tendon pathology in a British case-control study

Several genetic loci have been associated with risk of Achilles tendon pathology (ATP) within South African and Australian populations. The aim of this study was, therefore, to evaluate eight previously implicated genetic variants in an independent British population. A total of 130 asymptomatic controls (CON) and 112 participants clinically diagnosed with ATP comprising 87 individuals with chronic Achilles tendinopathy (TEN) and 25 with Achilles tendon ruptures (RUP) were included. All participants were genotyped for variants within the COL5A1, MIR608, IL-1β, IL-6 and CASP8 genes. Primary findings implicated COL5A1 and CASP8. Three inferred allele combinations constructed from COL5A1 rs12722, rs3196378 and rs71746744 were identified as risk modifiers. The T–C–D combination was associated with increased risk of ATP (P = 0.023) and RUP (P < 0.001), the C–A–I combination was associated with increased risk of ATP (P = 0.011), TEN (P = 0.011) and RUP (P = 0.011) and the C–C–D combination was associated with decreased risk of ATP (P = 0.011) and RUP (P = 0.004). The CASP8 rs3834129 DD genotype was associated with decreased risk of TEN (P = 0.020, odds ratio: 0.45, 95% confidence interval: 0.22–0.90) and the CASP8 I–G (rs3834129–rs1045485) inferred allele combination was associated with increased risk of TEN (P = 0.031). This study further highlights the importance of polymorphisms within COL5A1 and CASP8 in the aetiology of ATP.     

Influence of a Reflective Explicit Activity‐Based Approach on Elementary Teachers' Conceptions of Nature of Science

This study assessed the influence of a reflective, explicit, activity‐based approach to nature of science (NOS) instruction undertaken in the context of an elementary science methods course on preservice teachers' views of some aspects of NOS. These aspects included the empirical, tentative, subjective (theory‐laden), imaginative and creative, and social and cultural NOS. Two additional aspects were the distinction between observation and inference, and the functions of and relationship between scientific theories and laws. Participants were 25 undergraduate and 25 graduate preservice elementary teachers enrolled in two sections of the investigated course. An open‐ended NOS questionnaire coupled with individual interviews was used to assess participants' NOS views before and at the conclusion of the course. The majority of participants held naive views of the target NOS aspects at the beginning of the study. During the first week of class, participants were engaged in specially designed activities that were coupled with explicit NOS instruction. Throughout the remainder of the course, participants were provided with structured opportunities to reflect on their views of the target NOS aspects. Postinstruction assessments indicated that participants made substantial gains in their views of some of the target NOS aspects. Less substantial gains were evident in the case of the subjective, and social and cultural NOS. The results of the present study support the effectiveness of explicit, reflective NOS instruction. Such instruction, nonetheless, might be rendered more effective when integrated within a conceptual change approach. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 295–317, 2000.