Search results for " EMU"
showing 10 items of 83 documents
Development of accurate mass spectrometric routine and reference methods for the determination of trace amounts of iridium and rhodium in photographi…
1999
For the determination of trace amounts of iridium and rhodium in photographic emulsions different sample treatment procedures were coupled with inductively coupled plasma mass spectrometry (ICP-MS) and, for iridium, also with negative thermal ionisation isotope dilution mass spectrometry (NTI-IDMS) and ICP-IDMS. IDMS determinations of iridium were carried out using an enriched 191Ir spike solution. Elimination of the silver matrix was established for both mass spectrometric methods, which prevents corresponding memory effects in the ICP-MS system and is essential for the formation of IrO2 - thermal ions, respectively. For NTI-MS measurements, the gelatine matrix of the emulsion must also be…
Joaquín Catalá i l'oritgen de la investigació experimental en física nuclear i de partícules a Espanya
2008
Agustín Ceba Herrero: aguscebe@yahoo.es Experimental nuclear and particle physics was initiated in Spain in 1950 by the physicist Joaquín Catalá. In a stay in Bristol in 1949-1950 Catalá learned the technique of photographic emulsions in Cecil Powell’s laboratory. In few years Catalá succeeded in creating a stable group, links were established with the most important laboratories and many scientific papers were produced.
Emulsions based on fatty acid from vegetable oils for cosmetics
2022
Vegetable oils are sources of saturated, monounsaturated and polyunsaturated fatty acids. In this work, we studied the suitability of a mixture of vegetable oils and some fatty acids (similar to the those of the human skin) as a cosmetic emulsion. Hypericum (Hypericum perforatum L.) – 1 %, thistle (Silybum marianum (L.) Gaertn.) – 42 %, linen (Línum usitatíssimum L.) – 1.1 %, wheat germ (Triticum aestivum L.) – 1 %, sesame (Sésamum índicum L.) – 1 %, mustard (Sinápis álba L.) – 2%, pumpkin (Cucúrbita p é po L.) – 5 %, – were selected as vegetable oils. The emulsion based on the proposed mixture of vegetable oils has a higher antioxidant activity (1.623 OD) compared with that based on minera…
Sociālais medijs YouTube: sponsorēšana kā reklāmas veids skaistuma, modes un dzīvesstila video emuāros
2016
Bakalaura darba “Sociālais medijs YouTube: sponsorēšana kā reklāmas veids skaistuma, modes un dzīvesstila video emuāros” galvenie pētnieciskie jautājumi ir - vai YouTube video emuāru sponsorēšanas tendences Latvijas un ārzemju gadījumos ir atšķirīgas, un vai auditorijas attieksmi pret video sniegto informāciju ietekmē tā sponsorētais saturs? Darba teorētiskajā daļā aplūkoti sociālo mediju sponsorēšanas, līdzdalības kultūras koncepti un dramaturģiskā pieeja, sniegts digitālās reklāmas raksturojums. Metodoloģiskajā daļā pamatota tādu metožu kā kvantitatīvās kontentanalīzes, daļēji strukturētās intervijas un interneta aptaujas izvēle. Empīriskajā daļā analizēti 233 YouTube video, 2130 tiem pie…
Hydroxypropyl Cellulose Films Filled with Halloysite Nanotubes/Wax Hybrid Microspheres
2021
The design of novel nanocomposite films based on hydroxypropyl cellulose (HPC) and wax/halloysite hybrid microspheres has been reported. In particular, we first prepared wax/clay Pickering emulsions which were characterized by thermogravimetric analysis and microscopy. SEM images allowed more detailed insights on the nanotubes disposition at the wax/water interface, acting as an outer stabilizing shell. Therefore, the cellulosic biopolymer was added, and it was found that HPC enhances the colloidal stability of the particles, preventing their coalescence and sedimentation. The preparation of the composite films was carried out by the solvent casting method, which enabled the development of …
effect of the extraction of proteins from hemp press-cakes on their functionalities
2019
Plant proteins are a coherent option to feed the planet while limiting global warming. Common proteins (wheat, soya and maize) will soon no longer be sufficient to meet the increased demand for proteins. This thesis focuses on the development of a new source of plant protein for human consumption, based on a co-product of the oil mill: hemp proteins from press-cake. To meet this objective, the three main lines of action are: the definition of extraction conditions, the study of the physico-chemical properties of the isolates extracted under the defined conditions and the study of their emulsifying properties. The data in the literature on the extraction of hemp proteins are limited and not …
Surface active and emulsifying properties of casein micelles compared to those of sodium caseinate
1999
Emulsions prepared using casein micelles and sodium caseinate as the emulsifying agent are compared. It is found that the ultrastructure of the casein proteins influences the properties of the emulsion.
Aizguvumu lietojums ceļojumu emuāros
2020
Šajā bakalaura darbā tiek pētīts aizguvumu lietojums ceļojumu emuāros. Aizguvumi ir pētīti iepriekš, taču to lietojums ceļojumu emuāros nav pētīts tik plaši. Šī pētījuma mērķis ir izpētīt aizguvumu izcelsmi un lietošanas biežumu ceļojumu emuāros, un noteikt visplašāk izmantotos semantiskos laukus pie kuriem šie vārdi pieder. Pētījumu metodes ietver gan kvalitatīvos, gan kvantitatīvos. Analizētajā materiālā ietilpst trīssimt sešpadsmit aizguvumu no pieciem ceļojumu emuāriem, kuri tika analizēti pēc to izcelsmes un lietošanas biežuma. Pētījuma rezultāti rāda, ka starp visām divdesmit četrām izcelsmes valodām, aizguvumi no latīņu valodas angļu valodā dominē. Kā arī divi dominējošie semantiskie…
Retorisku jautājumu lietojums ceļojumu emuāros
2020
Gandrīz divdesmit gadus atpakaļ, emuāru rakstīšana ieguva savu popularitāti, tomēr to skaits ar katru gadu pieaug. Šī pētījuma mērķis ir analizēt retorisko jautājumu biežumu, veidus un to lietojumu ceļojumu emuāros. Lai sasniegtu šo mērķi, tika izpētīti sešdesmit ceļojumu emuāru vietnēs atrastie retoriskie jautājumi, tie izskaitīti, sagrupēti, pēc to piemītošajām īpašībām, un tad analizēti. Šajā darbā bija pielietotas četras pētījumu metodes, teorētiskās izpētes metode, kvantitatīvā analītiskā metode, klasteru analīze un diskursa analīze. Rezultāti liecina, ka retoriskie jautājumi ceļojumu emuāros parādās arvien biežāk. Turklāt, emuāru autori izmanto retoriskos jautājums, lai izstāstītu sav…
High pressure processing of food-grade emulsion systems: Antimicrobial activity, and effect on the physicochemical properties
2019
Abstract The use of high pressure processing (HPP) for development of stable emulsion-based delivery systems has been recently increased. Under adequate conditions, application of high pressures modifies the functionality of protein and polysaccharide molecules and significantly promotes the emulsifying activities. Application of high pressures also modulates the emulsion microstructure without any destabilization and gelation of protein molecules. The lipid oxidation in HPP-treated emulsions can be accelerated, particularly with higher pressure levels, while the HPP utilization on emulsions in acidic conditions can highly inhibit the growth of spoilage and pathogenic microorganisms. In thi…