Corticomotor excitability during precision motor tasks

The aim of this preliminary study was to investigate motor cortex (cortical) excitability between a similar fine visuomotor task of varying difficulty. Ten healthy adults (three female, seven male; 20—45 years of age) participated in the study. Participants were instructed to perform a fine visuomotor task by statically abducting their first index finger against a force transducer which displayed the level of force (represented as a marker) on a computer monitor. This marker was to be maintained between two stationary bars, also displayed on the computer monitor. The level of difficulty was increased by amplifying the position of the marker, making the task more difficult to control. Cortical measures of motor evoked potential (MEP) and silent period (SP) duration in first dorsal interosseous (FDI) muscle were obtained using transcranial magnetic stimulation (TMS) while the participant maintained the ‘‘easy’’ or ‘‘difficult’’ static task. An 11.8% increase in MEP amplitude was observed when subjects undertook the ‘‘difficult’’ task, but no differences in MEP latency or SP duration. The results from this preliminary study suggest that cortical excitability increases reflect the demand required to perform tasks requiring greater precision with suggestions for further research discussed

Reactivity of Nellore steers in two feedlot housing systems and its relationship with plasmatic cortisol

To evaluate reactivity to assess the temperament of Nellore steers in two feedlot housing systems (group pen or individual pen) and its relationship with plasmatic cortisol, 36 experimental units were observed five times at 28-day intervals of weight management during a 112-day feedlot confinement. A reactivity score scale ranging from 1 to 5 was applied when an animal was in the chute system. To the calmest animal, a reactivity score of 1 was ascribed and to the most agitated, 5. Blood samples were collected for cortisol analysis. No differences were found in reactivity and feedlot system. There was a relationship noted between reactivity and feedlot time in both housing systems (Pb0.01). There was a relation between reactivity and cortisol levels for group animals (P=0.0616) and for individual ones (Pb0.01). Cortisol levels varied among housing systems (Pb0.01). Feedlot time influenced the cortisol levels (Pb0.09 individual; Pb0.01 group) and when variable time was included, these levels changed, decreasing in the group pen and increasing in individual pens. The continuous handling reduces reactivity and plasmatic cortisol, and group pen system seems to be less stressfully than individual pens

Two-stage wireless network emulation

Testing and deploying mobile wireless networks and applications are very challenging tasks, due to the network size and administration as well as node mobility management. Well known simulation tools provide a more flexible environment but they do not run in real time and they rely on models of the developed system rather than on the system itself. Emulation is a hybrid approach allowing real application and traffic to be run over a simulated network, at the expense of accuracy when the number of nodes is too important. In this paper, emulation is split in two stages : first, the simulation of network conditions is precomputed so that it does not undergo real-time constraints that decrease its accuracy ; second, real applications and traffic are run on an emulation platform where the precomputed events are scheduled in soft real-time. This allows the use of accurate models for node mobility, radio signal propagation and communication stacks. An example shows that a simple situation can be simply tested with real applications and traffic while relying on accurate models. The consistency between the simulation results and the emulated conditions is also illustrated

Reflections on PATCO’s Legacy: Labor’s Strategic Challenges Persist

[Excerpt] The 1981 strike by over 11,000 members of the Professional Air Traffic Controllers Organization (PATCO) stands out as a symbol of union decline. This dismal legacy is a product of President Ronald Reagan’s harsh response to the job action, an ultimatum for controllers to return to work followed by wholesale permanent replacement of the strikers. Although PATCO’s members were federal employees, their dismissal is typically portrayed as an invitation for all employers to emulate the President. The subsequent sharp drop in private sector strike activity has been traced (both rhetorically and statistically) to PATCO’s demise, and even concessionary bargaining in industries far removed from the federal government and air transportation has been linked to this event. Although the direct negative effect of PATCO has almost certainly been exaggerated, there is no doubt that the strike symbolizes the dramatic shift in labor’s fortunes in the 1980s. In the first half of that decade private sector membership fell by three million, for a loss in union density of nearly one-third (Hirsch and Macpherson, 2006). The decline was caused by a myriad of factors—twin recessions in the early 1980s, globalization, deregulation, a shift in the economy from manufacturing to services, and increased employer anti- unionism facilitated by the Reagan administration’s conservative National Labor Relations Board. Also culpable were unions themselves as they clung to outmoded methods and stubbornly resisted change. PATCO’s only link to this array of forces working against labor was the part it played in Ronald Reagan’s offensive on the labor movement. The penchant of journalists and academics to stigmatize PATCO by focusing exclusively on its role as fodder for the Reagan administration’s anti-unionism detracts from important aspects of the unorthodox strategy of this fascinating labor organization. Although there were fatal tactical flaws in the PATCO game plan, this is one union that refused to be captive to past practices, instead developing creative approaches and pursuing an aggressive change agenda. A review of the organization’s operations and priorities in the years leading up to the 1981 strike will facilitate an assessment of how PATCO’s strategy compares to subsequent initiatives to transform U.S. unions

Out-of-School Time Policy Commentary #3: Reflections on System Building: Lessons from the After-School Movement

On February 3, 2003, the Bush Administration unveiled its request to cut funding for the 21st Century Community Learning Centers program by 40 percent in fiscal year 2004. This date also marked the administration's release of When Schools Stay Open Late: The National Evaluation of the 21st-Century Learning Centers Program, First Year Findings, the first report from the federally-funded evaluation being undertaken by Mathematica Policy Research. With these events as the backdrop, this commentary addresses the potential for, and threats to, the development of a healthy, connected out-of-school time system. When and how are evaluations useful? What does the 21st Century evaluation tell us? How do the findings square with other studies? What is the state of system building in out-of-school time? What challenges lie ahead

Spatio-temporal mapping of variation potentials in leaves of Helianthus annuus L. seedlings in situ using multi-electrode array.

Damaging thermal stimuli trigger long-lasting variation potentials (VPs) in higher plants. Owing to limitations in conventional plant electrophysiological recording techniques, recorded signals are composed of signals originating from all of the cells that are connected to an electrode. This limitation does not enable detailed spatio-temporal distributions of transmission and electrical activities in plants to be visualised. Multi-electrode array (MEA) enables the recording and imaging of dynamic spatio-temporal electrical activities in higher plants. Here, we used an 8 × 8 MEA with a polar distance of 450 μm to measure electrical activities from numerous cells simultaneously. The mapping of the data that were recorded from the MEA revealed the transfer mode of the thermally induced VPs in the leaves of Helianthus annuus L. seedlings in situ. These results suggest that MEA can enable recordings with high spatio-temporal resolution that facilitate the determination of the bioelectrical response mode of higher plants under stress

School of music showcase recital

Nikolai Kapustinarr. Mark HayesDouglas HillOsvaldo GolijovGaspar Cassad

Current trends in global demographic processes

Current local and national demographic trends have deepened the existing and formed new global demographic processes that have received a new historical reasoning that requires deep scientific research taking into account the influence of the multifactorial global dimension of the modern society development. The purpose of the article is to study the development of global demographic processes and to define the causes of their occurrence, manifestations, implications and prospects for implementation in the first half of the 21st century. The authors have identified and characterized four global demographic processes, namely population growth, migration, increase of tourism, and change in population structure. It is projected that in the 30’s of the 21st century, the number and growth rates of the world population will reach the objective growth and these dynamics over the next two decades will begin to change in the direction of reducing the growth rates, which will lead to gradual stabilization, and eventually reduce the size of the world population. By the middle of the 21st century, one can observe the preservation of the growth rates of international and domestic migration, the growth of international migration flows from the South to the North and from the East to the West, the strengthening of new economically developed centers of gravity (Canada, Australia and New Zealand), the increase in migration of rural population to cities, as well as urbanization and activation of the metropolises development. The share of international tourists in comparison with the world population will be constantly increasing, and the annual growth rate of the number of international tourists will significantly depend on the world economy and may vary at the several percent level. Permanent change will occur in the age, religious-cultural and socio-economic structure of the population

Functional Skills Support Programme: Developing functional skills in history

This booklet is part of "... a series of 11 booklets which helps schools to implement functional skills across the curriculum. The booklets illustrate how functional skills can be applied and developed in different subjects and contexts, supporting achievement at Key Stage 3 and Key Stage 4. Each booklet contains an introduction to functional skills for subject teachers, three practical planning examples with links to related websites and resources, a process for planning and a list of additional resources to support the teaching and learning of functional skills." - The National Strategies website