RUNNING VELOCITIES AND BATON CHANGE-OVERS IN 4 x 100 M RELAY EXCHANGES

In 4 x 100 m relays, the baton exchange happens as an interaction between two athletes running at very high speed. The purpose of this paper was to study this interaction in relay exchanges. Three normal training sessions of the international level male 4 x 100 m relay team was videotaped over one competition season. Athletes' velocities in different parts of the exchanges and the positions at which the baton change-overs occurred were analysed. Although the take-over zone is 20 m long, it seems that it is beneficial to have the changeover as late as possible (the overall performance of athletes in the change-over had a correlation of r = .667 (p < .000) with the position of the baton exchange). Further, the outgoing athlete has a task to accelerate fully. However, the results indicated that the athletes perceive each others velocities and adjust their own running accordingly

On the nature of the barlens component in barred galaxies: what do boxy/peanut bulges look like when viewed face-on?

Barred galaxies have interesting morphological features whose presence and properties set constraints on galactic evolution. Here we examine barlenses, i.e. lens-like components whose extent along the bar major axis is shorter than that of the bar and whose outline is oval or circular. We identify and analyse barlenses in $N$-body plus SPH simulations, compare them extensively with those from the NIRS0S (Near-IR S0 galaxy survey) and the S$^4$G samples (Spitzer Survey of Stellar Structure in Galaxies) and find very good agreement. We observe barlenses in our simulations from different viewing angles. This reveals that barlenses are the vertically thick part of the bar seen face-on, i.e. a barlens seen edge-on is a boxy/peanut/X bulge. In morphological studies, and in the absence of kinematics or photometry, a barlens, or part of it, may be mistaken for a classical bulge. Thus the true importance of classical bulges, both in numbers and mass, is smaller than currently assumed, which has implications for galaxy formation studies. Finally, using the shape of the isodensity curves, we propose a rule of thumb for measuring the barlens extent along the bar major axis of moderately inclined galaxies, thus providing an estimate of which part of the bar is thicker.Comment: 21 pages, 11 figures, revised version as published in MNRA

Main Tendencies of the Nut Market Development in Ukraine and Throughout the World Основные тенденции развития рынка орехов в Украине и мире

The author has determined the peculiarities of functioning and main problems of the nut inland market development, its type and aspect structure, the place of Ukraine in the world’s production and trade with nuts, the tendencies in the formation of price of their varieties as regards different countries as well as the development of nursery practice and establishment of orchards. The processes in the nut world’s market situation formation and current changes have been considered and the purpose fullness of legislative regulating the state support of the industrial nut-growing development proved.Определены особенности функционирования и основные проблемы развития отечественного рынка орехов, его тип, видовая структура и строение. Установлено место Украины в мировом производстве и торговле орехами, тенденции ценообразования на их разновидности в разрезе стран, а также в развитии питомников и закладке насаждений. Рассмотрены процессы формирования и текущие изменения конъюнктуры на мировом рынке орехов. Доказана целесообразность законодательного урегулирования государственной поддержки развития промышленного ореховодства

Alien Registration- Salo, Olga A. (Hebron, Oxford County)

https://digitalmaine.com/alien_docs/21149/thumbnail.jp

Pengaruh Metode Discovery Learning Terhadap Keaktifan Belajar Siswa (Studi Quasi Eksperimen Kelas VII SMPN 6 Banda Aceh)

Penelitian ini bertujuan untuk memperoleh suatu rancangan pembelajaran dengan menggunakan metode discovery learning untuk meningkatkan keaktifan belajar siswa. Penelitian ini dilaksanakan di SMPN 6 Banda Aceh. Metode penelitian yang digunakan adalah quasi eksperimen. Subjek penelitian adalah siswa SMPN 6 Banda Aceh yang berjumlah 60 orang. Analisis dilakukan dengan menggunakan perangkat lunak Ms. Excel dan SPSS. Hasil penelitiaan menunjukan bahwa gambaran umum keaktifan belajar siswa kelas VII SMPN 6 Banda Aceh termasuk pada katagori sedang. Berdasarkan analisis data ditemukan terdapat perbedaan pengaruh keaktifan belajar kelompok eksperimen dan kontrol secara signifikan

A sensitivity analysis of the prediction of the nitrogen fertilizer requirement of cauliflower crops using the HRI WELL_N computer model

HRI WELL_N is an easy to use computer model, which has been used by farmers and growers since 1994 to predict crop nitrogen (N) requirements for a wide range of agricultural and horticultural crops. A sensitivity analysis was carried out to investigate the model predictions of the N fertilizer requirement of cauliflower crops, and, at that rate, the yield achieved, yield response to the fertilizer applied, N uptake, NO3-N leaching below 30 and 90 cm and mineral N at harvest. The sensitivity to four input factors – soil mineral N before planting, mineralization rate of soil organic matter, expected yield and duration of growth – was assessed. Values of these were chosen to cover ranges between 40% and 160% of values typical for field crops of cauliflowers grown in East Anglia. The assessments were made for three soils – sand, sandy loam and silt – and three rainfall scenarios – an average year and years with 144% or 56% of average rainfall during the growing season. The sensitivity of each output variable to each of the input factors (and interactions between them) was assessed using a unique ‘sequential' analysis of variance approach developed as part of this research project. The most significant factors affecting N fertilizer requirement across all soil types/rainfall amounts were soil mineral N before planting and expected yield. N requirement increased with increasing yield expectation, and decreased with increasing amounts of soil mineral N before planting. The responses to soil mineral N were much greater when higher yields were expected. Retention of N in the rooting zone was predicted to be poor on light soils in the wettest conditions suggesting that to maximize N use, plants needed to grow rapidly and have reasonable yield potential. Assessment of the potential impacts of errors in the values of the input factors indicated that poor estimation of, in particular, yield expectation and soil mineral N before planting could lead to either yield loss or an increased level of potentially leachable soil mineral N at harvest. The research demonstrates the benefits of using computer simulation models to quantify the main factors for which information is needed in order to provide robust N fertilizer recommendations

Exponential instability in the fractional Calder\'on problem

In this note we prove the exponential instability of the fractional Calder\'on problem and thus prove the optimality of the logarithmic stability estimate from \cite{RS17}. In order to infer this result, we follow the strategy introduced by Mandache in \cite{M01} for the standard Calder\'on problem. Here we exploit a close relation between the fractional Calder\'on problem and the classical Poisson operator. Moreover, using the construction of a suitable orthonormal basis, we also prove (almost) optimality of the Runge approximation result for the fractional Laplacian, which was derived in \cite{RS17}. Finally, in one dimension, we show a close relation between the fractional Calder\'on problem and the truncated Hilbert transform.Comment: 17 page