3,475 research outputs found
Remote monitoring of impacts of ENSO related drought areas on Sabah rainforests
No full textThe performance of the NOAA AVHRR derived V13 vegetation index, relative to the NDVI, for monitoring impacts of the 1997-1998 ENSO related drought stress on Sabah rainforests was explored. Results demonstrated that the V13 index, which incorporates MIR reflectance, was more strongly correlated to rainfall values of this ENSO event than the more widely used NDVI. Moreover, maximum correlation was achieved at a longer lag period using the V13 than the NDVI, demonstrating its possible utility in a forecasting and monitoring system of ENSO related drought impacts on Sabah rainforest
Exploring the utility of NOAA AVHRR middle infrared reflectance to monitor the impacts of ENSO-induced drought stress on Sabah rainforests
No full textThe ever-wet tropics are under threat from ENSO events and there is a need for a monitoring system to analyse and describe their responses to such events. This letter explores the relative value of using NOAA AVHRR middle infrared (MIR) reflectance data and NDVI data for the monitoring of ENSO-related drought stress of a tropical forest ecosystem in Sabah, Malaysia. Relationships between rainfall and MIR reflectance were examined. Correlation coefficients are generally large and significant (at 0.1 level) while those between rainfall and NDVI were small and insignificant. This letter concludes that there is potential in using MIR reflectance for monitoring the effects of ENSO-induced drought stress on these forests and this has a bearing on how NOAA AVHRR data may be used to further our knowledge on the impacts of ENSO events on tropical forest environments
Towards a simplified approach to international price comparisons: A case for the Multilateral Walsh Index
No full text25 February, 2022We offer a simple alternative to the Gini-Eltetö-Köves-Szulc and Geary-Khamis methods used for international price and real expenditure comparisons. We show that the only symmetric average fixed basket price index that satisfies transitivity, country symmetry, and invariance to proportional changes in quantities is the multilateral Walsh index, a generalization of the superlative bilateral Walsh index (Diewert, 2001). Simplicity and its superior axiomatic properties, including identity and monotonicity, compared to current International Comparison Program (ICP) and Penn World Table (PWT) methods and plausibility and comparability of results based on the 2017 ICP data make the multilateral Walsh method an ideal choice.Abe’s work was supported by JSPS KAKENHI, 19H01467, 16H06322, and 18H00864.Rao acknowledges support from Hitotsubashi Institute for Advanced Study (HIAS) which facilitated visits to HIAS and funding from the Australian Research Council Discovery Project DP170103559
New (Probabilistic) Derivation of Diaz-Metcalf and Pólya-Szegő Inequalities and Consequences
No full textClassical inequalities of Diaz - Metcalf and Pólya - Szegő are generalized to
probabilistic setting which covers the initial deterministic (both discrete and integral) variants.
From these two inequalities, by the probabilistic derivation method further well -
known inequalities are obtained (that ones by Kantorovich, Rennie and Schweitzer)
Transitivity, Substitution Bias and the Fixed Basket Multilateral Walsh Index for International Price and Real Expenditure Comparisons
No full text7 May, 2022We advocate the multilateral Walsh index as a viable alternative to the Gini-Eltetö-Köves-Szulc (GEKS) and Geary-Khamis methods used in the Penn World Table and the International Comparison Program (ICP). We show that it is the only symmetric average fixed basket price index that satisfies transitivity, country symmetry, and invariance to proportional changes in quantities. Simplicity and its superior axiomatic properties including identity and monotonicity, and with associated substitution bias comparable to that of the GEKS_Fisher index, and plausibility and comparability of results based on the 2017 ICP data make the multilateral Walsh method an ideal choice for international price comparisons.Abe’s work was supported by JSPS KAKENHI, 19H01467, 16H06322, and 18H00864.Rao acknowledges support from Hitotsubashi Institute for Advanced Study (HIAS) which facilitated visits to HIAS and funding from the Australian Research Council Discovery Project DP170103559
Mouvance and the medieval author: re-editing Ancrene Wisse
No full textThe paper discusses the theoretical and practical problems of editing the early thirteenth-century guide for anchoresses, Ancrene Wisse, which (in Paul Zumthor's phrase) is an 'oeuvre mouvante', modified repeatedly from an early stage by its author and others
Tele-operated climbing and mobile service robots for remote inspection and maintenance in nuclear industry
No full textD.S. Merezhkovsky and C.G. Jung: General and Special
No full textВ статье рассмотрены особенности трактовки символа в творчестве Д.С. Мережковского и К.Г. Юнга. Показано влияние идей Мережковского на формирование воззрений К.Г. Юнга, проведен сопоставительный анализ их концепций символа как многозначной и универсальной категории, подчеркнуто значение творчества мыслителей для интерпретации исторических событий и осмысления современной общественной ситуации.The article describes the features of the interpretation of the symbol in the works of D.S. Merezhkovsky and K.G. Jung. The author focuses the attention on the influence Merezhkovsky's ideas on the formation of views of Jung, conducted a comparative analysis their conceptions of symbolism as a multi–valued and universal category, stressed the importance thinkers’ works for the interpret historical events and understanding the contemporary social situation
Fully localised edge states in boundary layers
No full textInvestigation of the laminar-turbulent boundary is performed in a boundary-layer flow. Constant homogeneous suction is applied at the wall in order to prevent the spatial growth of the layer, leading to the parallel Asymptotic Suction Boundary Layer (ASBL). Edge tracking is performed in a large computational domain allowing for full spatial localisation of the structures on the laminar-turbulent separatrix. The obtained dynamics of the state goes through calm and bursting phases. During the latter the structure grows in size, shedding vortices downstream of its core which viscously decay during the calm phases. Comparison with the computation in spatially growing boundary layer is made. The influence of the Reynolds number and the path leading from the edge state to turbulent flow are considered
Bypass transition in boundary layers as an activated process
No full textWe consider the spatio-temporal aspects of the transition to turbulence in a boundary layer above a flat plate exposed to free-stream turbulence. Combining results from the receptivity to free-stream turbulence with the observation of a double threshold from transition studies in e.g. pipe flow we arrive at a physically motivated prediction for the spatial distribution of nucleation events in boundary layers. We use a cellular automaton to implement a complete model for the spatial and temporal evolution of turbulent patches and show that the model reproduces the statistical features of the boundary layer remarkably well. The success of the modeling shows that bypass transition occurs as a spatiotemporally activated process, where transition is triggered by critical fluctuations imported from the free-stream turbulence
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