Using the concrete-representational-abstract teaching sequence to increase algebra problem-solving skills

Researchers have demonstrated the effectiveness of using direct instruction, learning strategy instruction and the concrete-representational-abstract teaching sequence for teaching a variety of basic math skills, but little research has been conducted related to their effectiveness for teaching more complex skills such as algebra. This study investigated the effects of teaching secondary school students with and without mild disabilities a strategy for solving algebra equations and word problems using the concrete-representational-abstract (CRA) teaching sequence. There were 169 secondary students who participated in this study. Of the 169 participants, 79 were male and 90 were female, they ranged in age from 11 to 19, and 61 had mild disabilities (i.e., learning disabilities and emotional disturbances). Students in the treatment group participated in 11 algebra lessons using the CRA teaching sequence. Students in the control group participated in 11 algebra lessons using traditional textbook-based instruction. Both groups of students received the same practice problems during their respective lessons. Student scores were compared across Teacher-Made Pretests, Posttests, and Maintenance tests. All students increased their ability to solve the algebra problems. The CPA approach and the traditional teaching method were equally effective. The results from, this research show that both general education and special education students can learn to solve algebra problems

Heart rate variability analysis in sheep affected by transmissible spongiform encephalopathies

<p>Abstract</p> <p>Background</p> <p>The function of the autonomic nervous system can be assessed by determining heart rate variability (HRV), which is impaired in some brainstem diseases in humans. Transmissible spongiform encephalopathies (TSEs) in sheep are diseases characterised by accumulation of disease-associated prion protein in the brainstem, including nuclei of the parasympathetic nervous system. This study was undertaken to assess whether analysis of HRV can be used as an aid in the diagnosis of TSEs in clinically affected, naturally or experimentally infected sheep.</p> <p>Findings</p> <p>When HRV indices were compared between 41 clinical TSE cases (18 sheep infected with scrapie and 23 sheep infected with bovine spongiform encephalopathy), 11 control sheep and six sheep reported as scrapie suspects or dosed with BSE brain homogenate, which were not confirmed as TSE cases by postmortem tests, no significant differences were found between the groups. Median heart rate was significantly different but only when sheep were grouped by gender: it was higher in female TSE cases than in control sheep and higher in female than castrated male ovine classical BSE cases.</p> <p>Conclusions</p> <p>HRV analysis was not useful as a diagnostic aid for TSEs of sheep.</p

The Great Discrepancy: Political Action, Sustainable Development and Ecological Communication

The term ‘sustainable development’ was coined to denote a political goal some 40 years ago; debates about sustainability date back considerably further. These debates reflect the growing awareness of the destructive effects of human activities on the natural foundations of life. Numerous initiatives have been launched to trigger a turnaround, with the 2030 Agenda and the SDGs being the latest attempt. However, substantial progress has been rather limited thus far. This discrepancy is the subject of the article. Starting from a historical overview of sustainability politics, the argument develops in three steps. First, it is shown that conventional conceptions to promote environmental change fall short in depicting the broader societal context. To provide a comprehensive picture of the challenges related to transformation processes, a theory of the functional differentiation of societies is presented in a second step. A systems theory perspective offers a convincing theoretical explication of the problem. Third, this approach is scrutinized with regard to the political system and the politics of sustainability. The key finding is that the specific functional logics of the different social subsystems must be taken into account when analysing sustainable development and the discrepancy between the aims and ambitions of (global) environmental policy and the visible consequences. On the one hand, the functional differentiation of modern society guarantees its high degree of effectiveness and flexibility. On the other hand, implementing fundamental change, such as a transition towards sustainability, is not simply a question of strategy or of political willingness and steering. Rather, there is a need for more elaborate explanatory instruments. As a result, we argue for a linking of theories of sustainable development and advanced social theory

Moderated Mediation Analysis: A Review and Application to School Climate Research

Moderated mediation analysis is a valuable technique for assessing whether an indirect effect is conditional on values of a moderating variable. We review the basis of moderation and mediation and their integration into a combined model of moderated mediation within a regression framework. Thereafter, an analytic and interpretive illustration of the technique is provided in the context of a substantive school climate research question. The illustration is based on a sample of 318 high schools that examines whether school-wide student engagement mediates the association between the prevalence of teasing and bullying (PTB) and academic achievement on a state-mandated reading exam; and whether this indirect effect was moderated by student perceptions of teacher support

Community Advanced Data and Research Analysis: A Mixed Methods Capstone Project

The Community Advanced Data and Research Analysis project, or CADRA, is project that houses an interdisciplinary research team located at the University of Nevada, Las Vegas. The vision of CADRA, as defined by its stakeholders, is to create positive community outcomes by encouraging and engaging nonprofit organizations, as well as student and professional researchers, to develop and evolve their data management practices. CADRA offers three program options including Nonprofit Audits, Program Development and Grant Writing, and Community Data Mining. The purpose of this program evaluation will be to evaluate the Community Advanced Data and Research Analysis (CADRA) Project, with a specific assessment of their access and obtainability to data in the Las Vegas community

Influence of Cattle Stocking Rate on Browsing of Norway Spruce in Subalpine Wood Pastures

In the Swiss Alps, 15% of Swiss mountain forests are grazed during summer, mainly by cattle. The forest laws of various Swiss cantons characterise forest grazing as a detrimental form of land use and stipulate that this grazing practice should be restricted. However, little is known about tree damage actually caused by cattle. Seven subalpine ranges in the Swiss Canton Grisons, grazed by cattle at different stocking rates, were investigated. The condition of naturally regenerated young trees (Picea abies (L.) Karst.) was assessed before and after the cattle grazing period. In order to characterise the influence of wild ungulates on the young trees during winter, the assessment of tree condition was repeated in the proximate spring. In total, 4% of the young trees were browsed on the apical shoot, 10% were browsed on lateral shoots, 13% of the trees showed other damage. The variation among ranges could almost completely be explained by the cattle stocking rate (livestock units per hectare). During winter, wild ungulates browsed 3 times as many young trees as the cattle during summer. The results suggest that cattle stocking rates on subalpine wood pastures should not exceed one livestock unit per hectare in order to avoid intensive browsing and other damage by cattle on young Norway spruce

Time and frequency domain analysis of heart rate variability in cattle affected by bovine spongiform encephalopathy

<p>Abstract</p> <p>Background</p> <p>Heart rate variability (HRV) analysis is a method to assess the function of the autonomic nervous system. Brainstem nuclei that influence HRV are affected by vacuolar changes and accumulation of disease-associated prion protein (PrP^d) in bovine spongiform encephalopathy (BSE) resulting in clinical signs suggestive of an increased parasympathetic tone. It was hypothesised that BSE in cattle causes changes in the autonomic nervous system; this was tested by comparing HRV indices derived from 1048 electrocardiograms, which were recorded from 51 naturally or experimentally infected cattle with BSE confirmed by postmortem tests, 321 clinical suspect cases or cattle inoculated with potentially infectious tissue without disease confirmation and 78 BSE-free control cattle.</p> <p>Findings</p> <p>Statistically significant differences were found for low or high frequency power, their normalised values and ratio when the last recording prior to cull or repeated recordings were compared but only between male and female cattle of the three groups and not between groups of the same gender, even though BSE cases of each gender appeared to be more nervous during the recording. The same findings were made for heart rate, deviation from the mean RR interval and vasovagal tonus index when repeated recordings were compared. BSE cases with severe vacuolar changes in the parasympathetic nucleus of the vagus nerve had a significantly lower low:high frequency power ratio but not a lower heart rate than BSE cases with mild vacuolation, whereas severity of vacuolar changes in the solitary tract nucleus or intensity of PrP^daccumulation in both nuclei did not appear to have any affect on either index. Abnormalities in the electrocardiogram were detected in 3% of the recordings irrespective of the BSE status; sinus arrhythmia was present in 93% of the remaining recordings.</p> <p>Conclusions</p> <p>HRV analysis was not useful to distinguish BSE-positive from BSE-negative cattle grouped by gender, and HRV indices appeared to be mainly influenced by gender. There is agreement with earlier studies that vacuolar changes in the brainstem may be associated with an increased parasympathetic tone in BSE and that abnormalities in an electrocardiogram can be detected in cattle without evidence of heart disease.</p