Search results for "Solid"
showing 10 items of 3575 documents
Inquiry of The Kerr Effect Origins in Organic Materials: Experimental Assessment By Z-Scan Method
2020
Šajā darbā tika izmantota Z-scan metode, lai izpētītu organisko materiālu nelineāri optiskās īpašības. Tas ietvēra 27 dažādu organisko savienojumu Kerra un divfotonu absorbcijas (2FA) efektu mērījumus un iegūto rezultātu salīdzināšanu ar kvantu ķīmijas aprēķinu (KĶA) prognozēm, kā arī no polarizācijas atkarīgu Z-scan metodes izmantošanu, lai nošķirtu elektronisko un pārorientācijas ieguldījumu Kerra efektā. Rezultāti paradīja, ka KĶA lineārās polarizējamības vērtības var izmantot, lai prognozētu Kerra efekta pārorientācijas komponentes vērtību. Attiecībā uz elektronisko ieguldījumu, otrās kārtas hiperpolarizējamības, kas raksturo šī ieguldījumu lielumu, eksperimentālo un KĶA vērtību attiecī…
Caurspīdīgu un elektrovadošu pārklājumu uz ZnO bāzes izgatavošanas procesa izstrāde un īpašību pētījumi
2018
Caurspīdīgās un elektrovadošās oksīdu (TCO) kārtiņas tiek izmantotas opto-elektronikā. AZO tiek uzskatīts par alternatīvu dārgajam ITO. Joprojām nav pilnībā izprasta izgatavošanas parametru ietekme uz AZO kārtiņu īpašībām. Ir nepieciešams izgatavot arī kvalitatīvu p-tipa TCO. Šajā darbā ir izgatavotas n-tipa AZO un p-tipa Zn-Ir-O kārtiņas ar magnetrono izputināšanu. Kārtiņas tika raksturotas ar XRF, XRD, XAS, SEM, Ramana un FTIR spektroskopiju, Holla efektu, termoelektriskajiem mērījumiem un redzamās gaismas caurlaidību. Darbā ir nodemonstrēta strauja alumīnija koncentrācijas izmaiņa pie zemas skābekļa plūsmas. Al piemaisījumu elektriskā aktivācija un kārtiņas struktūra mainās atkarībā no i…
Роль туннелирования в процессах накопления радиационных дефектов и в теории диффузионно-контролируемых реакций
1975
Advisor: Тале, Иварс
Intra-Tumour Genetic Heterogeneity and Prognosis in High-Risk Neuroblastoma
2021
Simple Summary Neuroblastoma (NB) is the most common extra-cranial solid paediatric cancer and is responsible for 15% of childhood cancer deaths. Patients with NB are characterized by presenting a very heterogeneous clinic (inter-tumoural heterogeneity) and also both spatial and temporal intra-tumour heterogeneity (ITH) reflected in their genetic aberrations, which may be the consequence of the coexistence of different microenvironments within the tumour. Applying pangenomic techniques to detect genomic aberrations in different biopsies (solid and liquid) of high risk NB (HR-NB) we have detected spatial ITH in a surprisingly high percentage (almost 40%) of the studied cohort. Moreover, a po…
The choice of a solid waste management system using the Electre II decision-aid method
1995
A multicriteria decision-aid method, Electre II, was applied to the real choice process of a solid waste management system in the Uusimaa region, Finland. The criteria used were chosen by a supervision group. The weights of the criteria were defined by the managers of environmental and technical affairs of each municipality in Uusimaa, Finland. The use of the Electre II method leads us to recommend centralized incineration as the best municipal solid waste management system for the planning region. However, the second best alternative, intermediate RDF combustion with intermediate landfilling was finally chosen by the municipalities.
ELECTRE III and IV Decision Aids in an Environmental Problem
1997
This paper gives a description and analysis of the use of ELECTRE III and IV decision aids in the context of choosing a solid waste management system in two different real applications in Finland. Both methods fit this context well in general, since the problem involves many criteria and many ‘decision makers’. The available data are imprecise, which also favours the use of outranking methods. In addition to the real applications, we also study the choice behaviour offered for decision makers in connection with these methods by looking at some test results obtained from randomly generated problems. In general, the results of ELECTRE III and IV do not differ substantially from those from the…
Numerical modeling of the solid-state sintering at the microstructural level: Multiphysics approach and application to metal additive manufacturing
2023
Numerical modeling of the solid-state sintering at the microstructural level: Multiphysics approach and application to metal additive manufacturing
Lietotņu decentralizācija ar saistīto datu tehnoloģiju palīdzību
2018
Bakalaura darbā tiek pētīta sociālā tīmekļa lietotņu decentralizācija ar saistīto datu tehnoloģiju palīdzību, kas tiek piedāvāta kā viens no risinājumiem tīmekļa centralizācijas problēmām, kā arī īsi apskatītas citas pieejas tīmekļa decentralizācijai. Darbā galvenā uzmanība tiek pievērsta projektam Solid, kura ietvaros ir izstrādāti metožu kopa un rīki decentralizētu lietotņu būvēšanai, balstoties uz saistīto datu principiem. Darba praktiskajā daļā tika izstrādāta decentralizēta demonstrācijas lietotne attēlu publicēšanai, izmantojot Solid platformu. Rezultātā tika secināts, ka Solid platformai ir potenciāls decentralizētu tīmekļa lietotņu izveidē.
Determination of phenolic compounds in surface waters using high-performance liquid chromatography and molecularly imprinted solid-phase extraction
2021
An effective and reliable analytical method based on molecularly imprinted solid-phase extraction (MI-SPE) and high-performance liquid chromatography with photodiode array detector was developed to simultaneously determine four phenolic compounds: bisphenol A, 2-phenylphenol, tert-octylphenol and nonylphenol. A molecularly imprinted polymer that can selectively recognize bisphenol A and alkylphenols was developed. A bulk polymerization method using bisphenol A as a template, acrylamide as functional monomer, ethylene glycol dimethacrylate as the cross-linking agent, acetonitrile as porogenic solvent and 1,1’-azobis(cyclohexanecarbonitrile) as initiator was applied. This polymer was applied …
Application of solid-phase microextraction for determining phenylurea herbicides and their homologous anilines from vegetables.
2004
Abstract Residues of metobromuron, monolinuron and linuron herbicides and their aniline homologous were analyzed in carrots, onions and potatoes by solid-phase microextraction (SPME) performed with a polyacrylate fiber. A juice was obtained from food samples that were further diluted, and an aliquot was extracted after sodium chloride (14%) addition and pH control. At pH 4 only the phenylureas were extracted. A new extraction at pH 11 allowed the extraction of phenylureas plus homologous aniline metabolites. Determination was carried out by gas chromatography with nitrogen–phosporus detection (NPD) the identity of the determined compounds was studied by gas chromatography–mass spectrometry.…