Search results for "Diagram"
showing 10 items of 795 documents
Interfacial tension between coexisting polymer solutions in mixed solvents and its correlation with bulk thermodynamics: phase equilibria (liquid/gas…
2002
Abstract Vapor pressures, phase equilibria and interfacial tensions σ were measured for solutions of poly(dimethylsiloxane) (PDMS, M w [equals]75 kg/mol and M n [equals]50 kg/mol) in mixed solvents of toluene (TL) and ethanol (EtOH) at 30, 40, 50 and 60 °C. The experimental ternary phase diagrams can be modeled quantitatively from the determined concentration and temperature dependent binary interaction parameters χ ij if the experimentally inaccessible composition dependence of χ EtOH/PDMS is adjusted. The relations between σ and the equation of state of the system differ from that applying to single solvents. The exponents as well as the amplitude prefactors of the corresponding scaling l…
QENS from polymeric micelles in supercritical CO[sub 2]
2000
We report QENS measurements from PS-b-PFOA aggregates in supercritical CO2. These consist of dense cores of CO2-insoluble polystyrene surrounded by a ‘corona’ of PFOA surfactant molecules whose CO2-philic groups interface with supercritical CO2. Lineshapes are dominated by localized diffusive modes and segmental dynamics of the anchored, finite-length PFOA chains. For Q∼0.6 A−1, we obtain effective diffusion coefficients of ≈0.8×10−6 cm2/sec. At higher Q, a single component is not sufficient as shown by excess intensity on the flanks. For Q>1.5 A−1, the wings reflect contributions due to a distribution of faster, more localized chain modes.
Bulk pre-reactional transformations preceding the thermal decomposition of calcium hydroxide into oxide
1990
The present paper is an extended abstract which should be considered as an introduction to the papers already published by us on this new topic. An extended synthesis of these papers was given in the lecture. The original information introduced here is the figure. It is a PH2O vs. T diagram which gives the pre-reactional domain between the stability domains of calcium hydroxide and calcium oxide. Chemical reactions are proposed as an interpretation of the observed pre-reactional transformations.
Ab initio molecular orbital study of the substituent effect on phosphine–borane complexes
1998
Abstract Ab initio molecular orbital calculations have been used to study the substituent effect on H 3 BPH n Me 3− n and Me 3− n H n BPH 3 ( n =0–3) phosphine–borane complexes. The ab initio results show that successive methyl substitution on the phosphine favours complex formation, contrary to successive methyl substitution on the borane. The natural bond orbitals partitioning scheme suggests that, in general, there is no correlation between the charge transfer and the complexation energies. It also shows the shortening of the P–H and P–C bond lengths, upon complexation, is due to the increasing `s' character of these bonds.
Datu vizualizācija tīmekļa vietnēs
2015
Mūsdienas ir daudz iespējas iegūt lielu datu daudzumu, kurus var analizēt un veidot dažadas statistikas par pašreizējam tendencēm un notikumiem. Lidz ar šo lielo datu daudzumu ir problēma ka tos attēlot, lai cilvēkam, kas tos skatas būtu interesanti un datus varētu viegli uztvert. Darba mērķis ir esošam projektam ar daudz datiem atrast piemērotu datu vizualizacijas riku. Darba uzdevumi ir izvirzit kritērijus kadiem jaatbilst rikam un salidzinat esošos rikus pēc šiem kritērijiem. No apskatitajiem rikiem jaizvērtē, kurš ir piemērotaks un tas jaievieš esošaja projekta. Rezultata tika izveidotas vairakas datu vizualizacijas, kuras ir ievietotas projekta timekļa vietnē. Izstradatas vizualizacija…
Onomatopea e fonosimbolismo
2016
National audience
ViziQuer rīka realizācija tīmekļa vidē
2016
Kvalifikācijas darbā “Viziquer rīka realizācija tīmekļa vidē” izstrādāta programmatūra, kas nodrošina ViziQuer rīka tīmekļa vides versijas darbības ar izvēlnēm, vaicājuma diagrammas papildināšanu ar saistītajiem elementiem, kā arī SPARQL valodā rakstītā vaicājuma ģenerēšanu. Darbs ir izstrādāts Latvijas Universitātes Matemātikas un Informātikas Institūtā. Darbs sastāv no sekojošām nodaļām: programmatūras prasību specifikācija, programmatūras projektējuma apraksts, projekta organizācija, kvalitātes nodrošināšana, konfigurāciju pārvaldība, testēšanas dokumentācija un darbietilpības novērtējums. Pielikumā ir pievienots izstrādātas programmatūras kods.
Decentralized Deployment of Mobile Sensors for Optimal Connected Sensing Coverage
2008
In this paper, we address the optimal connected sensing coverage problem, i.e., how mobile sensors with limited sensing capabilities can cooperatively adjust their locations so as to maximize the extension of the covered area while avoiding any internal “holes”, areas that are not covered by any sensor. Our solution consists in a distributed motion algorithm that is based on an original extension of the Voronoi tessellation.
VEBO: Validation of E-R diagrams through ontologies and WordNet
2012
In the semantic web vision, ontologies are building blocks for providing applications with a high level description of the operating environment in support of interoperability and semantic capabilities. The importance of ontologies in this respect is clearly stated in many works. Another crucial issue to increase the semantic aspect of web is to enrich the level of expressivity of database related data. Nowadays, databases are the primary source of information for dynamical web sites. The linguistic data used to build the database structure could be relevant for extracting meaningful information. In most cases, this type of information is not used for information retrieval. The work present…
Computational procedures for plastic shakedown design of structures
2004
The minimum volume design problem of elastic perfectly plastic finite element structures subjected to a combination of fixed and perfect cyclic loads is studied. The design problem is formulated in such a way that incremental collapse is certainly prevented. The search for the structural design with the required limit behaviour is effected following two different formulations, both developed on the grounds of a statical approach: the first one operates below the elastic shakedown limit and is able to provide a suboptimal design; the second one operates above the elastic shakedown limit and is able to provide the/an optimal design. The Kuhn–Tucker conditions of the two problems provide usefu…