THE NILES-MERTON SONGS: A PERFORMANCE GUIDE OF SELECTED SONGS

The Niles-Merton Songs is a two-opus collection of twenty-two songs by John Jacob Niles setting the poetry of Thomas Merton. The songs are beautiful but contrast from his more popular works in poetry and composition. This project explores reasons why these songs are rarely performed, and gives an overview and analysis of ten selected pieces. The document includes a brief introduction, biographies of Niles and Merton, information detailing Niles’s compositional process, and the technical and artistic requirements for performing the songs, including appropriate age and voice type

Compensation of sampled-data systems

"November 8, 1958.""Reprinted from Proceedings of the National Electronics Conference, Volume XIII, Hotel Sherman, Chicago, Illinois, October 7, 8, 9, 1957.""Compensation of sampled-data systems is straight forward if the compensation network can be separated from the rest of the system by samplers. However, use of directly connected continuous networks presents more of a problem. Existing theory does not adequately cover such compensation. This paper examines the above situation using z-transform theory and continuous network realizability conditions. Lack of a general correlation between the number of z-plane and s-plane zeros presents the major problem. This difficulty becomes apparent when attempting to find a principle Laplace transform for the final system impulse response following z-plane compensation. By imposing certain restrictions on z-plane pole locations and by approximating the desired system impulse response in the s-plane, this paper demonstrates the use of directly connected RC networks in lieu of discrete networks or digital computers for compensating sampled-data systems. Studies are, also, made concerning the requirements necessary to eliminate the need for approximating the final impulse response. Graphs are presented to allow the solution of this problem for third order systems."--Page 1

The Effects of Gender and Implicit Theories on Science Achievement and Interest in Elementary-Aged Students

The current study set out to determine the relationship between student gradelevel, implicit views of science ability, science achievement and science interest.Differences by grade level were also explored. The study also considered the differences in male and female implicit theories of science ability, science interest, and science achievement. Participants in the current study consisted of a total of 1910 students from six elementary schools from one south-central Kentucky district that participate in Project GEMS (Gifted Education in Math and Science). Data were analyzed by means of analysis of variance and Pearson correlations. Younger students evidenced lower scores on the implicit theories measure. No gender differences were observed in implicit theories of science ability or science interest. Females did evidence lower achievement in science than males. Implicit theories of science ability were significantly and positively correlated with science achievement. Conversely, no such relationship existed between implicit theories of science ability and interest. Limitations of the current study are discussed and possible future directions are offered. Findings from the current study underscore the importance of considering domain-specific views of ability when addressing poor science performance and when considering gender gaps in science achievement

Traumatic rupture of the descending thoracic aorta

The management of acute traumatic rupture of the descending thoracic aorta at Groote Schuur Hospital between January 1984 and December 1989 is reviewed. Aortic rupture was diagnosed angiographically in 18 of 150 patients (12%), who underwent aortography because this injury was suspected. However. 3 of these patients had false-positive angiograms. The diagnosis was initially missed in 31% of patients, and this contributed to morbidity and mortality. Simple aortic crossclamping (N = 8) was used before September 1988 and 3 patients died - 1 intra-operatively from cardiac arrhythmia and 2 postoperatively, where major peri-operative haemorrhage had occurred. In contrast, partial heparin-less bypass (N = 5) using a centrifugal vortex pump was used after September 1988, and there were no haemorrhagic or paraplegic complications or mortality in this group. This technique is safe and appears to be superior to simple aortic crossclamping in managing this condition

Response of neural reward regions to food cues in autism spectrum disorders

BACKGROUND: One hypothesis for the social deficits that characterize autism spectrum disorders (ASD) is diminished neural reward response to social interaction and attachment. Prior research using established monetary reward paradigms as a test of non-social reward to compare with social reward may involve confounds in the ability of individuals with ASD to utilize symbolic representation of money and the abstraction required to interpret monetary gains. Thus, a useful addition to our understanding of neural reward circuitry in ASD includes a characterization of the neural response to primary rewards. METHOD: We asked 17 children with ASD and 18 children without ASD to abstain from eating for at least four hours before an MRI scan in which they viewed images of high-calorie foods. We assessed the neural reward network for increases in the blood oxygenation level dependent (BOLD) signal in response to the food images RESULTS: We found very similar patterns of increased BOLD signal to these images in the two groups; both groups showed increased BOLD signal in the bilateral amygdala, as well as in the nucleus accumbens, orbitofrontal cortex, and insula. Direct group comparisons revealed that the ASD group showed a stronger response to food cues in bilateral insula along the anterior-posterior gradient and in the anterior cingulate cortex than the control group, whereas there were no neural reward regions that showed higher activation for controls than for ASD. CONCLUSION: These results suggest that neural response to primary rewards is not diminished but in fact shows an aberrant enhancement in children with ASD

Sifiso Mzobe’s Young Blood: Spaces of getting and becoming in post-apartheid Durban

Sifiso Mzobe’s Young blood (2010) generates much of its energy, this article will argue, through its representation of social and physical mobility and its articulation of space with modes of consumption in post-apartheid South Africa. The novel is set chiefly in the township of Umlazi, the city of Durban and some of its middle- class suburbs. The chief protagonist, a young car thief, moves between township, city and suburb with ease in stolen cars. The open space of the highway separates township and suburb, but also connects them. The novel shows how the spatial arrangements of power and control associated with apartheid are increasingly undermined and reconfigured by new practices of everyday life. Young blood suggests that a certain style of driving can offer new ways of inhabiting the South African city and of bringing its disparate parts together. The ability to move between places in the novel provides opportunities for upward mobility and also enables new forms of symbiosis, trade and consumption. Stealing and driving cars enable Sifiso and his friends to bridge the divide between township and suburb and turn the distance between the two places into a domain of attainment and performance. But the rapid upward social mobility that high-level criminal activity allows is exposed as uncertain and ephemeral by the end of the novel, and the slower route offered by education to self-improvement and class mobility is proffered in its place

Reduced memory skills and increased hair cortisol levels in recent Ecstasy/MDMA users: significant but independent neurocognitive and neurohormonal deficits

Objectives The goals of this study were to measure the neurocognitive performance of recent users of recreational Ecstasy and investigate whether it was associated with the stress hormone cortisol. Methods The 101 participants included 27 recent light users of Ecstasy (one to four times in the last 3 months), 23 recent heavier Ecstasy users (five or more times) and 51 non-users. Rivermead paragraph recall provided an objective measure for immediate and delayed recall. The prospective and retrospective memory questionnaire provided a subjective index of memory deficits. Cortisol levels were taken from near-scalp 3-month hair samples. Results Cortisol was significantly raised in recent heavy Ecstasy users compared with controls, whereas hair cortisol in light Ecstasy users was not raised. Both Ecstasy groups were significantly impaired on the Rivermead delayed word recall, and both groups reported significantly more retrospective and prospective memory problems. Stepwise regression confirmed that lifetime Ecstasy predicted the extent of these memory deficits. Conclusions Recreational Ecstasy is associated with increased levels of the bio-energetic stress hormone cortisol and significant memory impairments. No significant relationship between cortisol and the cognitive deficits was observed. Ecstasy users did display evidence of a metacognitive deficit, with the strength of the correlations between objective and subjective memory performances being significantly lower in the Ecstasy users

MDMA and brain activity during neurocognitive performance: An overview of neuroimaging studies with abstinent 'Ecstasy' users.

MDMA/Ecstasy has had a resurgence in popularity, with recent supplies comprising higher strength MDMA, potentially leading to increased drug-related harm. Neurocognitive problems have been widely reported in ecstasy users, equally some studies report null findings, and it remains unclear which factors underlie the development of neurocognitive impairments. This review covers the empirical research into brain activity during neurocognitive performance, using fMRI, fNIRS, and EEG. Our main conclusion is that chronic repeated use of recreational ecstasy can result in haemodynamic and electrophysiological changes that reflect recruitment of additional resources to perform cognitive tasks. Findings are consistent with serotonergic system changes, although whether this reflects neurotoxicity or neuroadaptation, cannot be answered from these data. There is a degree of heterogeneity in the methodologies and findings, limiting the strengths of current conclusions. Future research with functional neuroimaging paired with molecular imaging, genetics or pharmacological challenges of the serotonin system may help to decipher the link between serotonergic and cognitive changes in ecstasy users

Linking cognitive measures of response inhibition and reward sensitivity to trait impulsivity

Impulsivity is regarded as a multifaceted construct that comprises two dimensions: rapid-response impulsivity and reward-delay impulsivity. It is unclear, however, which aspects of trait impulsivity, as assessed by self-report measures are related to rapid-response impulsivity and/or to reward-delay impulsivity, as different results have been reported in studies using both self-report and cognitive measures. This study aimed to directly relate self-report measures of impulsivity to cognitive measures of impulsivity in individuals at low- or high-levels on two impulsivity dimensions, specifically rapid-response impulsivity and reward-delay impulsivity. Participants were classified into high- or low-impulsivity groups based on (1) level of rapid-response impulsivity (determined by BIS-11 Motor subscale scores); (2) level of reward-delay impulsivity (determined by BIS/BAS subscale scores); and (3) a combination of rapid-response impulsivity and reward-delay impulsivity levels. Impulsivity was assessed using Go/No-Go, Stop-Signal and Delay-Discounting tasks and self-report measures. The high rapid-response impulsivity group showed significantly higher reward-delay impulsivity on both, the Delay-Discounting tasks and on self-report measures assessing reward-delay impulsivity, than the low-risk group. Based on the level of reward-delay impulsivity, the high reward-delay impulsivity group scored significantly higher on task-based (cognitive) and self-report measures assessing rapid-response inhibition than the low reward-delay impulsivity group. Combining both dimensions of impulsivity showed that the high-impulsivity group performed significantly worse in rapid-response paradigms and temporally discounted significantly more impulsively than the low-impulsivity group. Thus, combined impulsivity factors provide better assessment of impulsivity than each dimension alone. In conclusion, robust differences in impulsivity can be identified in non-clinical young adults

Bisphenol A and Triclosan: Emerging Environmental Pollutants in Western Kentucky Watershed: Study 1: (Benningfield) Triclosan Concentrations in Western Kentucky Watershed

Triclosan (2,4,4’-trichloro-2’-hydroxyphenyl ether) is considered as one of the emerging new pollutants in the environment. In this study, triclosan contamination levels were measured in water samples collected from Murray Wastewater Treatment Plant (WWTP), Bee Creek, Clarks River and Kentucky Lake. Enzyme-linked immunosorbent assay method was used to determine triclosan concentrations in the samples. The results revealed that detectable concentrations of triclosan were found in all samples analyzed. The concentrations of triclosan exhibited the following trend: Influent \u3e Effluent \u3e Downstream Bee Creek \u3e Upstream Bee Creek ≥ Clarks River \u3e Kentucky Lake (Hancock Biological Station site). Removal efficiency calculations revealed that about 40% of triclosan enter the receiving waters (Bee Creek). Clarks River and Kentucky Lake water samples contained relatively lower levels of triclosan than WWTP samples. For comparison, water samples from Mayfield Creek and Red Duck Creek were analyzed for triclosan concentrations