A note on the derivation of the mesh admittance matrix of networks with branch voltage sources by application of diakoptics

In this paper the computation of the mesh admittance matrix of networks with branch voltage sources is derived by the application of diakoptics. It is assumed that the networks are divided into subnetworks such that the mutual inductive coupling exist only in each subnetworks or between the cut branches connecting the subnetworks.     

From Musical Expressivity to Public Political Discourse Proper: The Case of Karpe Diem in the Aftermath of the Utøya Massacre

Musical communication is widely understood to be too elusive and abstract to have any discernible significance for political public discourse. However, in the aftermath of the Utøya massacre there have been several instances where hip hop music and performances have been subjected to politicised debate in the Norwegian public sphere. Based on a qualitative case study of the media reception of the Norwegian hip hop group Karpe Diem, this study finds that their music both provoked and fed into extensive public debates concerning topical cultural and political issues. Moreover, this study outlines the process through which Karpe Diem and their music came to be publicly identified, and responded to, as politically significant. Based on the evidence of the findings, this article further argues that hip hop music fills a peripheral (yet significant) function in the model of the political system as outlined by Habermas (2006).     

Differential time responses in inflammatory and oxidative stress markers after a marathon: An observational study

ABSTRACT

Acute and adaptive changes in systemic markers of oxidatively generated nucleic acid modifications (i.e., 8-oxo-7,8-dihydro-2?-deoxyguanosine (8-oxodG) and 8-oxo-7,8-dihydroguanosine (8-oxoGuo)) as well as inflammatory cytokines (i.e., C-reactive protein, interleukin-6, interleukin-10, and tumour necrosis factor alpha), a liver hormone (i.e., fibroblast growth factor 21 (FGF21)), and bone metabolism markers (sclerostin, osteocalcin, C-terminal telopeptide, and N-terminal propeptide of type 1 procollagen) were investigated following a marathon in 20 study participants. Immediate changes were observed in inflammatory cytokines, FGF21, and bone metabolism markers following the marathon. In contrast, no immediate changes in urinary excretion of 8-oxodG and 8-oxoGuo were evident. Four days after the marathon, decreased urinary excretion of 8-oxodG (-2.9 (95% CI -4.8;-1.1) nmol/24 h, P < 0.01) and 8-oxoGuo (-5.8 (95% CI -10.3;-1.3) nmol/24 h, P = 0.02) was observed. The excretion rate of 8-oxodG remained decreased 7 days after the marathon compared to baseline (-2.3 (95%CI -4.3;-0.4) nmol/24 h, P = 0.02), whereas the excretion rate of 8-oxoGuo was normalized. In conclusion marathon participation immediately induced a considerable inflammatory response, but did not increase excretion rates of oxidatively generated nucleic acid modifications. In fact, a delayed decrease in oxidatively generated nucleic acid modifications was observed suggesting adaptive antioxidative effects following exercise.     

Meta-Representation in an Algebra I Classroom

We describe how 1 Algebra I teacher and her 8th-grade students used meta-representational knowledge when generating and evaluating equations to solve word problems. Analyzing data from a sequence of 4 lessons, we found that the teacher and her students used criteria for evaluating equations, in addition to other types of knowledge (e.g., different interpretations of the equal sign) previously reported in the literature. Moreover, the teacher and her students had trouble understanding one another's proposed algebraic models of problem situations due to differences in the criteria that each applied, and this impeded learning. These findings (a) extend an accumulating body of evidence for the role meta-representation plays in mathematics and science learning and (b) add a new dimension to researchers' growing understanding of what teachers must know in order to teach algebra and other complex mathematics and science topics effectively.     

The effects of different motivational climates on students' achievement goals,motivational strategies and attitudes toward physical education☆

The aim of this study was to analyse whether conducting physical education lessons according to different motivational climates leads to a significant difference between students' achievement goals, motivational strategies and attitudes towards physical education. Participants (81-ninth grade students) were allocated to one of three experimental groups. The researchers conducted a 12-week programme of physical education lessons with the experimental groups. The programme used the same lesson plans; however, in each experimental group, the researchers created different motivational climates (mastery, performance approach or performance avoidance) according to the Motivational Climate Observer Control List. The students' achievement goals, motivational strategies and attitudes towards physical education were measured at the beginning and end of the semester. Consequently, it was observed that the mastery-and performance-approach focused-motivational climates within physical education lessons produced positive outputs in terms of cognitive and affective scores.     

Forefoot and heel take-off strategies result in different distribution of lower extremity work during landings

ABSTRACT

Previous research suggests that landing mechanics may be affected by the mechanics of the preceding jump take-off. The purpose of the present study was to investigate whether jump take-off mechanics influence the subsequent landing mechanics. Female volleyball (n = 17) and ice hockey (n = 19) players performed maximal vertical jumps with forefoot and heel take-off strategies. During forefoot and heel jumps, participants were instructed to shift their weight to their forefoot or heel, respectively, and push through this portion of the foot throughout the jump. Jump mechanics were examined using 3D motion analysis, where lower extremity net joint moment (NJM) work, NJM, and segment angles were compared between forefoot and heel jumps using multivariate ANOVA. During jump take-off, participants performed more positive ankle plantar flexor and knee extensor NJM work in forefoot compared to heel jumps (P < 0.05). From initial foot contact to foot flat, participants performed more negative ankle plantar flexor and hip extensor NJM work during heel compared to forefoot jumps (P < 0.05). The present results demonstrate that using a heel take-off strategy results in a different distribution of lower extremity NJM work and NJM during landing compared to landings following forefoot jumps.     

Designing Deliberation Systems

In a liberal democracy, the evolution of political agendas and formation of policy involves deliberation: serious consideration of political issues. Modern-day political participation is dependent on widespread deliberation supported by information and communication technologies, which also offer the potential to revitalize and transform citizen engagement in democracy. Although the majority of Web 2.0 systems enable these discourses to some extent, government institutions commission and manage specialized deliberation systems (information systems designed to support participative discourse) intended to promote citizen engagement. The most common examples of these are political discussion forums. Although usually considered trivial adaptations of well-known technologies, these types of deliberative systems are often unsuccessful, and present a distinct set of design and management challenges. In this article, the authors analyze the issues involved in establishing political deliberation systems under four headings: stakeholder engagement, Web platform design, service management, political process reshaping, and evaluation and improvement. We review the existing literature and present a longitudinal case study: the Norwegian Demokratitorget (Democracy Square). We define key issues in each of the four areas, which need to be understood to design and manage a successful net-based deliberation forum.     

A hybrid approach for extracting informative content from web pages

Eliminating noisy information and extracting informative content have become important issues for web mining, search and accessibility. This extraction process can employ automatic techniques and hand-crafted rules. Automatic extraction techniques focus on various machine learning methods, but implementing these techniques increases time complexity of the extraction process. Conversely, extraction through hand-crafted rules is an efficient technique that uses string manipulation functions, but preparing these rules is difficult and cumbersome for users. In this paper, we present a hybrid approach that contains two steps that can invoke each other. The first step discovers informative content using Decision Tree Learning as an appropriate machine learning method and creates rules from the results of this learning method. The second step extracts informative content using rules obtained from the first step. However, if the second step does not return an extraction result, the first step gets invoked. In our experiments, the first step achieves high accuracy with 95.76% in extraction of the informative content. Moreover, 71.92% of the rules can be used in the extraction process, and it is approximately 240 times faster than the first step.