132 research outputs found
Representation of Vilis Lacis in the Latvian press (1988 - 2004)
No full textBakalaura darba mērķis ir atsegt, to kā latviešu presē laikposmā no 1988. līdz 2004. gadam tiek reprezentēts rakstnieks un politiķis Vilis Lācis.
Teorija aplūko sociālo atmiņu, reprezentāciju, ietver Viļa Lāča personības izpētes pakāpes apskatu, kā arī publiskās telpas un mediju raksturojumu Trešās Atmodas un atjaunotās Latvijas laikā.
Kontentanalīzes un diskursa vēsturiskās analīzes rezultāti liecina, ka norisinās jauna V.Lāča koncepcijas veidošana, atmetot padomju laikos mākslīgi konstruēto tēlu. Latviešu presē laikposmā no 1988. gadam līdz 2004. gadam Vilis Lācis reprezentēts pretrunīgi, pamatoti argumenti ir gan Lāča aizstāvjiem, gan apsūdzētajiem.
Atslēgvārdi: Vilis Lācis, reprezentācija, latviešu prese, sociālā atmiņaThe aim of the bachelor is to uncover how is represented writer and politician Vilis Lacis during the period from 1988. to 2004. in the Latvian press.
The theory deals with social memory, representation, includes Vilis Lacis personality research level, as well as public space and media characteristics of Third awakening and the renewed Latvian state.
Results of content analysis and discourse historical analysis show that happens a new building of V. Lacis concept, discarding in the Soviet times, artificially constructed image. In the Latvian press during the period from 1988. year to 2004. Vilis Lacis was represented conflicting, reasoned arguments had to V. Lacis defenders and also the accusers.
KEYWORDS: Vilis Lacis, representation, latvian press, social memor
Experimental study of the role of physicochemical surface processing on the IN ability of mineral dust particles
No full textDuring the measurement campaign FROST 2 (FReezing Of duST 2), the Leipzig Aerosol Cloud Interaction Simulator (LACIS) was used to investigate the influences of various surface modifications on the immersion freezing behavior of Arizona Test Dust (ATD) particles. The dust particles were exposed to sulfuric acid vapor, to water vapor with and without the addition of ammonia gas, and heat using a thermodenuder operating at 250 °C. Size selected, quasi monodisperse particles with a mobility diameter of 300 nm were fed into LACIS and droplets grew on these particles such that each droplet contained a single particle. Temperature dependent frozen fractions of these droplets were determined in a temperature range between −40 °C ≤ T ≤ −28 °C. The pure ATD particles nucleated ice over a~broad temperature range with their freezing behavior being separated into two freezing branches characterized through different slopes in the frozen fraction vs. temperature curves. Coating the ATD particles with sulfuric acid resulted in the particles' IN potential significantly decreasing in the first freezing branch (T > −35 °C) and a slight increase in the second branch (T≤ −35 °C). The addition of water vapor after the sulfuric acid coating caused the disappearance of the first freezing branch and a strong reduction of the IN ability in the second freezing branch. The presence of ammonia gas during water vapor exposure had a negligible effect on the particles' IN ability compared to the effect of water vapor. Heating in the thermodenuder led to a decreased IN ability of the sulfuric acid coated particles for both branches but the additional heat did not or only slightly change the IN ability of the pure ATD and the water vapor exposed sulfuric acid coated particles. In other words, the combination of both sulfuric acid and water vapor being present is a main cause for the ice active surface features of the ATD particles being destroyed. A possible explanation could be the chemical transformation of ice active metal silicates to metal sulfates. From an atmospheric point of view, and here specifically the influences of atmospheric aging on the IN ability of dust particles, the strongly enhanced reaction between sulfuric acid and dust in the presence of water vapor, and the resulting significant reductions in IN potential, are certainly very interesting
Characterisation of the Latvian and Swedish Sweet and Sour Cherry Genetic Resources
No full textA wide diversity of cherry varieties are collected in the Latvian and Swedish genetic resources collections, which consists of landraces and selections of local breeders, adapted to the local climate and growing conditions (winter hardy and disease resistant) as well as germplasm that results from years of scientific exchange and co-operation with the world’s leading plant research institutes. The introduction of this material into the breeding programs is largely dependent on the level of characterization. The genetic diversity and internal structure of Latvian and Swedish sweet and sour cherry genetic resources collections has been investigated using phenotypical characterization and evaluation in combination with SSR and self-incompatibility gene specific molecular markers. Phenotypical and molecular characterization revealed high phenotypic and genetic diversity of analysed germplasm as well as the relatedness of Baltic and Scandinavian sweet and especially sour cherry landraces which indicates a possible common historical origin. Local Baltic-Scandinavian cherry varieties were also differentiated from other cherry germplasm by the frequency of self-incompatibility alleles detected using gene specific molecular markers. Self-incompatibility allele information gained from this study will be also useful in breeding programmes for the planning of crosses and conservation of alleles. The use of different characterization methods of cherry genetic resources also facilitated methodological observations, applicable to cherry germplasm characterization. It was concluded that thorough evaluation of genetic diversity and internal structure of cherry genetic resources collections should include both phenotypic and molecular characterization. The information of genetic relatedness revealed by SSR markers did not show direct correspondence with the relatedness information detected by phenotypic characterization, regardless of the number of analysed markers. Therefore a sufficient preliminary description of cherry genetic resources and discovery of internal genetic relatedness of germplasm could be obtained by using phenotypic description in combination with a small set of highly polymorphic SSR markers in combination with available gene specific markers
ARCHIVES OF THE RUSSIAN FEDERATION CONCERNING HISTORY OF THE MOSCOW INSTITUTE OF NATIONAL ECONOMY
No full textOn the basis of source analysis of archive documents the author studies work of the Moscow Plekhanov Institute of National Economy during the most difficult period of institution history and history of Russian higher education in general, i. e. the pre-war time from mid- late- 1930s of the 20th century. He raises the question of the faculty and employees functioning as well as the institution management, its directors M. I. Lacis, A. K. Abolin, A. V. Morozov. The author points out the necessity to highlight contribution of the Plekhanov Russian University of Economics academics to the process of establishing and developing the Russian state system, public, political and cultural life of the country at various stages of its history
EVALUATION OF GREEN LASER SOURCE ADDITIVE MANUFACTURING TECHNOLOGY FOR ACCELERATOR APPLICATIONS WITH ULTRA-HIGH VACUUM REQUIREMENTS
No full textAdditive Manufacturing (AM) offers different benefits such as efficient material usage, reduced production time and design freedom. Moreover, with continuous technological developments, AM expands in versatility and different material usage capabilities. Recently new energy sources have been developed for AM – green wavelength lasers, which provide better energy absorption for pure copper. Due to high thermal and electrical conductivity of copper, this novel AM technology is highly promising for various industries, particularly, there is a huge interest to use it for accelerator applications. In particular, these AM produced accelerator components should reach the associated Ultra High Vacuum (UHV)
requirements. In this study, vacuum membranes of pure copper were produced by AM using a green laser source, in different thicknesses and built angles. Furthermore, a vacuum membrane helium leak tightness test was performed at room temperature by using a high-sensitivity mass spectrometer. Comparison of these test results was performed with previously established results. Through this study, novel knowledge and initial results are provided
for green laser source AM technology usage for applications for UHV accelerator components
Random Coefficient State Model. Approximated Densities Filtering
No full textThe Kalman Filtering applies to state models with noisy linear equations which
describe the state evolution and with noisy linear equations of observations. This
filtering recursively computes the a posteriori state law given the present and
past observations. The approximated densities filtering allows ta process either
nonlinear state equations or equations with non Gaussian noises.
For a random dynamical coefficient, typical situation of models abrupt changes,
this paper introduces bi-modal parameted laws of probability whichh are used to
approach the a posteriori suite laws at any time by adapting parameters . These
are recursively computed at each updating and prediction.Le filtrage de Bucy-Kalman s'applique au modèle d'état comprenant des équations
linéaires bruitées, décrivant l'évolution de l'état et des équations linéaires bruitées
d'observation . Ce filtrage consiste dans le cas gaussien, à calculer de façon
récursive, la loi de probabilité, a posteriori, de l'état, au vu de l' observation actuelle
et des observations passées . Le filtrage par densités approchées permet de traiter
des équations d'état, non linéaires ou à bruits non Gaussiens .
Pour un coefficient de rappel aléatoire, cas typique d'une situation de changements
de modèles, l'article introduit une famille de lois de probabilité, paramétrées,
bimodales servant, par ajustement des paramètres, à approcher les lois a posteriori
de l'état aux divers instants . Les paramètres sont recalculés récursivement, lors
des mises à jour et des prédictions
Multiple-scattering calculations for layered phononic structures of nonspherical particles
No full textWe present an extension of the layer-multiple-scattering method to phononic crystals of nonspherical particles
in a homogeneous host medium by employing the extended-boundary-condition technique for the description
of the individual scatterers. The efficiency of the method is demonstrated on specific examples of two- and
three-dimensional periodic assemblies of spheroidal polymer particles in water and in silicon. We report a
thorough analysis of the acoustic properties of these composites and emphasize aspects of the underlying physics
that relate to the nonspherical shape of the particles
Comparison of Solar and Other Influences on Long-term Climate
No full textExamples are shown of climate variability, and unforced climate fluctuations are discussed, as evidenced in both model simulations and observations. Then the author compares different global climate forcings, a comparison which by itself has significant implications. Finally, the author discusses a new climate simulation for the 1980s and 1990s which incorporates the principal known global climate forcings. The results indicate a likelihood of rapid global warming in the early 1990s
- …
