Search results for "Satu"
showing 10 items of 1367 documents
Testing Soil Encasing Materials for Measuring Hydraulic Conductivity of a Sandy-Loam Soil by the Cube Methods
2008
The Cube Method (CM) and the Modified Cube Method (MCM) were developed for measuring vertical (K v ) and horizontal (K h ) saturated hydraulic conductivity of a single soil sample. By these methods, a cube of soil is carved out in situ and a suitable material is applied to enclose the cube in a tightly fitting casing before moving the sample to the laboratory. Problems may be associated with the use of gypsum, originally used to encase soil. The suitability of molten wax and expandable polyurethane foam to encase a soil cube was tested for a sandy-loam soil. Wax-treated samples yielded lower conductivity results than untreated samples by a maximum factor of 3.7. The observed discrepancies w…
Structure of longitudinal chromomagnetic fields in high energy collisions
2014
We compute expectation values of spatial Wilson loops in the forward light cone of high-energy collisions. We consider ensembles of gauge field configurations generated from a classical Gaussian effective action as well as solutions of high-energy renormalization group evolution with fixed and running coupling. The initial fields correspond to a color field condensate exhibiting domain-like structure over distance scales of order the saturation scale. At later times universal scaling emerges at large distances for all ensembles, with a nontrivial critical exponent. Finally, we compare the results for the Wilson loop to the two-point correlator of magnetic fields.
Mācību satura integratīvais aspekts ģeogrāfijas stundās mācīšanās motivācijas paaugstināšanai
2015
Pētījuma problēmas būtība ir Skolēnu nepietiekamās spējas iegūtās zināšanas vienā mācību priekšmetā izmantot jaunās situācijās, attīstīt un pielietot citos priekšmetos. Skolēnu izzinās spējas pilnveidošanos mācīšanas motivācijas paaugstināšanai skolotājs ierosina Skolēnu pamatojumu atbildēt uz jautājumiem: Kāpēc jāmāca? Kāpēc jāzina? Pētījuma mērķis ir izpētīt mācību satura integratīvo aspektu Skolēnu izziņas spēju pilnveidošanai un mācīšanās motivācijas paaugstināšanai. Pētījumā tika integrēti pieci mācību priekšmeti: ģeogrāfija, bioloģija, ķīmija, vēsture, angļu valoda un informātika. Integrētās stundas realizācijai Tehnikumā tika aprobētas daudzveidīgas mācību metodes: C.L.I.L., WebQuest…
Two relaxation times and thermal nonlinear waves along wires with lateral heat exchange
2021
Abstract We propose a model for studying several nonlinear waves for heat transport along a cylindrical system with lateral non-linear heat transfer to the environment. We consider relaxational equations, each with its own relaxation time, for longitudinal heat transfer and for lateral heat transfer across the wall. We consider two kinds of nonlinear lateral heat transport: radiative heat transport, and flux-limited heat transport. This work generalizes our previous studies in which the relaxation time for the lateral heat transfer was considered equal to that of the longitudinal heat flux. We explore the influence of both relaxation times on the propagation speed of linear and nonlinear wa…
Encapsulation of Xenon by a Self-Assembled Fe4L6 Metallosupramolecular Cage
2015
We report (129)Xe NMR experiments showing that a Fe4L6 metallosupramolecular cage can encapsulate xenon in water with a binding constant of 16 M(-1). The observations pave the way for exploiting metallosupramolecular cages as economical means to extract rare gases as well as (129)Xe NMR-based bio-, pH, and temperature sensors. Xe in the Fe4L6 cage has an unusual chemical shift downfield from free Xe in water. The exchange rate between the encapsulated and free Xe was determined to be about 10 Hz, potentially allowing signal amplification via chemical exchange saturation transfer. Computational treatment showed that dynamical effects of Xe motion as well as relativistic effects have signific…
Source shape and data analysis procedure effects on hydraulic conductivity of a sandy-loam soil determined by ponding infiltration runs
2017
Performing ponding infiltration runs with non-circular sources could represent a good means to sample completely an area of interest. Regardless of the shape of the source, predicting the expected reliability of the collected data by infiltrometers should facilitate soil hydraulic characterisation and also allow a more conscious use of the field data. The influence of the shape of the infiltration source (i.e., circular or square) and the analysis procedure of the steady-state infiltration data on the saturated hydraulic conductivity, Ks, of a sandy-loam soil was tested in this investigation. Circular and square surfaces sampled with the pressure infiltrometer (PI) yielded similar estimates…
SMAP Multi-Temporal vegetation optical depth retrieval as an indicator of crop yield trends and crop composition
2017
Vegetation Optical Depth (VOD) is related to Vegetation Water Content (VWC). This provides new and highly valuable information for ecological and agricultural studies. In this work, VOD from the Soil Moisture Active-Passive (SMAP) satellite has been retrieved with the new Multi-Temporal Dual-Channel Algorithm (MT-DCA). Then, it has been applied to the study of crop yield trends and crop composition. The increase on VOD (¿VOD) during crop development has been compared to yield data in two selected regions located in the United States. The first region presents a heterogeneous crop composition and weak ¿VOD-yield relationship (r2=0.21). The second region presents a highly homogenous cover and…
Youtube kā televīzijas satura izvietošanas platforma - kanāla “LTV_16 plus” analīze
2020
Bakalaura darba “Youtube kā televīzijas satura izvietošanas platforma— kanāla “LTV_16plus” analīze” mērķis ir veicot kvalitatīvo kontentanalīzi, padziļināto interviju un anketēšanu rast priekšstatu, kāda ir jauniešu attieksme par televīzijas satura izvietošanu platformā Youtube. Darbs sastāv no piecām nodaļām. Teorētisko daļu sastāda apakšnodaļas par bērniem un jauniešiem digitālajā vidē, jauniešu un bērnu izpratni par medijpratību, televīziju kā satura veidotāju, video koplietošanas vietni Youtube. Metodoloģijas daļā tiek apskatītas izmantotas pētniecības metodes un pētījumā plāns. Darbā tika secināts, ka jauniešu attieksme par televīzijas satura izvietošanu platformā Youtube ir pozitīva, …
Physicochemical Investigation of the Solubilization of Ytterbium Nitrate in AOT Reverse Micelles and Liquid Crystals
2006
A wide investigation of the solubilization of the water-soluble salt Yb(NO3)(3) in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles and AOT liquid crystals has been carried out. After saturation of water/AOT/organic solvent w/o microemulsions with pure Yb(NO3)(3), the Yb(NO3)(3)/AOT composites were prepared by complete evaporation under vacuum of the volatile components (water and organic solvent) of the salt-containing microemulsions. It was observed that these composites can be totally dissolved in pure n-heptane or CCl4, allowing the solubilization of a noticeable amount of Yb(NO3)(3) in quite dry apolar media. By UV-vis-NIR, FT-IR, and H-1 NMR spectroscopies, some informati…
Ķīmisko elementu saturs zivju konservos
2019
Ķīmisko elementu saturs zivju konservos. Ērgle R., zinātniskais vadītājs Dr. ķīm. Rudoviča V. Bakalaura darbs, 42 lappuses, 16 attēli, 8 tabulas, 65 literatūras avoti, 9 pielikumi. Latviešu valodā. Bakalaura darba ietvaros tika apkopota un izvērtēta zinātniskā un mācību literatūra par ķīmisko elementu saturu zivju konservos, konservu iepakojuma veidiem un ķīmisko elementu šķīšanu konservētā ēdienā. Paraugu sagatavošanā izmantota mineralizācija mikroviļņu enerģijas tehnikā. Ķīmisko elementu (Pb, Fe, Sn, Al, Cd, Cu, As un Hg) saturs Latvijā ražotos zivju konservos kvantitatīvi noteikts ar divām instrumentālām analīzes metodēm – induktīvi saistītās plazmas masspektrometriju un elektrotermālo a…