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231.
232.
Jan Laštovička 《Studia Geophysica et Geodaetica》1994,38(2):206-212
Summary The nighttime LF radio wave absorption in the lower ionosphere measured at two frequencies in central Europe over 1963–1985
is used to infer planetary wave activity and its long-term trend in the upper middle atmosphere (∼90–100 km). The observed
positive trend is roughly consistent with results based on daytime absorption. Nighttime results are less pronounced and less
statistically significant probably due to perturbing effects of geomagnetic activity. The observed trends, which are probably
of anthropogenic origin, are together with the daytime results [3,4] the first evidence of long-term trends in planetary wave
activity in the upper middle atmosphere. 相似文献
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236.
Modelling magnetization processes in single-and multi-domain rock samples using the preisach diagram
Summary The paper presents the results of identifying a model of the Preisach type for haematite grains of the single-domain as well as multi-domain size. Due to the phenomenological conception of the model, the relations between the parameters of the model and actual parameters are very complex, however, impressive accuracy and stability of the modified model indicate the need to resume studies of this problem. The model parameters also confirm the adequate properties of the vibrating-sample magnetometr (VSM) used and developed in our laboratories. 相似文献
237.
Summary The paper deals with a non-linear regression model, linear in parameters. The least-squares adaptation method has been used
to determine the model parameters. The conditionality problem in solving equations, which follows from the dependent predictors,
has been suppressed by singular decomposition. This model is especially suitable for treating meteorological problems because
non-linear processes, e.g. changes of air masses, changes of circulation patterns, etc., can be treated. The model has been
tested in connection with the forecast of daily maximum and minimum temperatures. The RMS error lies in the range of 1–2°C,
if the principal PPM is supposed.
Резюме Оnuсывеamся мamемamuческuŭ annaрam нелuнеŭноŭ ре?rt;рессuонноŭ мо?rt;елu, лuнеŭноŭ оmнос umельно naрaмеmров. Для оnре?rt;еленuя naрaмеmров мо?rt;елu uсnользуеmся меmо?rt; нauменьщuх квa?rt;рamов. Плохaя обусловленносmь сuсmемы нauменьщuх квa?rt;рamов, коmорaя вызвaнa взauмноŭ зaвuсuмосmью nре?rt;uкmоров, всmрaняеmся nрu nомощu сuн?rt;улярноŭ ?rt;екомnозuцuu. Эma мо?rt;ель nо?rt;хо?rt;um ?rt;ля nрuмененuя в меmеороло?rt;uu, maк кaк онa nозволяеm рaбоmamь с нелuнеŭносmямu, кaк нanрuмер uзмененuе воз?rt;ущных мaсс, uзмененuе хaрaкmерa цuркуляцuu u m. n. Мо?rt;ель nроверяеmся нa nро?rt;нозе ?rt;невных мuнuмaльных u мaксuмaльных mемnерamур. Сре?rt;няя квa?rt;рamuческaя ошuбкa нaхо?rt;umся в uнmе?rt;рaле оm 1 ?rt;о 2° (uсnользовaн nрuнцun РРМ).相似文献
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Unkašević Miroslava 《Theoretical and Applied Climatology》1991,44(3-4):223-228
Summary For practical applications both the parent distribution of rainfall intensities and the distribution of their annual maxima are of interest. The relationship between these two distributions cannot be obtained from classical extreme value theory because of seasonal variation and serial correlation in the data. Mathematical results for the distribution of maxima in m-dependent sequences are presented to illustrate the effect of local dependence on the extreme value distribution. The average number of exceedances in a cluster is an important parameter in the relationship between the parent and the extreme value distribution. For 5-min rainfall data from Belgrade, quantiles of the annual maxima are overestimated by about 10 mm h–1 if the effect of serial correlation is ignored. This bias can easily be removed by taking the local clustering of large rainfall intensities in a rainy spell into account.With 4 Figures 相似文献
240.
The rate of compositional and isotopic exchange between minerals may be enhanced significantly if the rock is deformed simultaneously.
The enhanced exchange rate may result from a reduction in grain size (shorter distance for volume diffusion), dissolution
and growth of grains by diffusion creep (pressure solution), or the movement of high-angle grain boundaries through strained
grains during recrystallization in the dislocation creep regime. The migration of high-angle grain boundaries provides high
diffusivity paths for the rapid exchange of components during recrystallization. The operation of the latter process has been
demonstrated by deforming aggregates consisting of two plagioclases (An1 and An79) at 900°C, 1 GPa confining pressure, and a strain rate of ∼2x10-6s-1. The polygonal, recrystallized grains were analyzed using an analytical transmission electron microscope and have a variable
but often intermediate composition. At the conditions of these experiments, the volume interdiffusion rate of NaSi/CaAl is
too slow to produce any observable chemical change, and microstructural-chemical relations indicate that the contribution
from diffusion creep was insignificant except for initially fine-grained (2–10 μm) aggregates. These results indicate that
strain-induced recrystallization can be an effective mechanism for enhancing the kinetics of metamorphic reactions and for
resetting the isotope systematics of minerals such as feldspars, pyroxenes, and amphiboles. 相似文献