Search results for "Loo"
showing 10 items of 7086 documents
Selluloosajohdannaisten rakenteen ja substituutioasteen tutkiminen
2016
Nykyään ympäristöystävällisille, biohajoaville ja uusiutuvista luonnonvaroista valmistetuille tuotteille on suuri kysyntä. Tämän takia erilaiset selluloosan johdannaiset ovat kiinnostavia. Näistä karboksimetyyliselluloosa on eniten käytetty vesiliukoinen selluloosan eetteri. Tässä pro gradu -tutkielmassa käsiteltiin karboksimetyyliselluloosan selluloosarakenteen ja substituutioasteen tutkimuksessa hyödynnettäviä analyysimenetelmiä. Kromatografiset ja spektroskopiset menetelmät ovat tärkeimpiä selluloosarungon tutkimuksessa. Substituutioaste voidaan määrittää esimerkiksi perinteisillä titrausmenetelmillä. Substituutioastejakaumaa puolestaan voidaan tutkia nestekromatografisesti.
Erilaisten selluloosamateriaalien nitraus ja karakterisointi
2016
Selluloosan nitrauksen avulla on valmistettu ruutia jo satoja vuosia. Perinteisen puuvillaselluloosan nitrauksen lisäksi voidaan käyttää vaihtoehtoisia selluloosalähteitä kuten puuselluloosaa sen hyvän saatavuuden vuoksi tai nanoselluloosaa sen puhtauden ja tarkan rakenteen takia. Selluloosalähteiden nitrautuvuuteen vaikuttavat tärkeimmät ominaisuudet ovat selluloosan puhtaus, saatavuus sekä polymeeriketjun pituus. Nitrautuminen on tasapainoreaktio, joka tapahtuu matalissa lämpötiloissa. Nitrausprosesseja operoidaan joko jatkuvana syklinä tai erissä. Sekä lähtöaineena toimiva selluloosa että reaktion lopputuotteena oleva nitroselluloosa ovat heterogeenisiä polymeerejä, mikä aiheuttaa sen et…
Sex differences in correlates of intermediate phenotypes and prevalent cardiovascular disease in the general population
2015
Background: There are marked sex differences in cardiovascular disease (CVD) manifestation. It is largely unknown how the distribution of CVD risk factors or intermediate phenotypes explain sex-specific differences. Methods and Results: In 5000 individuals of the population-based Gutenberg Health Study, mean age 55 ± 11 years, 51% males, we examined sex-specific associations of classical CVD risk factors with intima-media thickness, ankle-brachial index, flow-mediated dilation, peripheral arterial tonometry, echocardiographic, and electrocardiographic variables. Intermediate cardiovascular phenotypes were related to prevalent CVD [coronary artery disease, heart failure, stroke, myocardial i…
Sex Differences in the Physiological Network of Healthy Young Subjects
2021
Within human physiology, systemic interactions couple physiological variables to maintain homeostasis. These interactions change according to health status and are modified by factors such as age and sex. For several physiological processes, sex-based distinctions in normal physiology are present and defined in isolation. However, new methodologies are indispensable to analyze system-wide properties and interactions with the objective of exploring differences between sexes. Here we propose a new method to construct complex inferential networks from a normalization using the clinical criteria for health of physiological variables, and the correlations between anthropometric and blood tests b…
Physiological parameters measurements in a cardiac cycle via a combo PPG-ECG system
2015
In this paper, we present an innovative way to measure some physiological parameters (such as the pre-ejection period, the pulse transit time, the blood pressure) in a cardiac cycle. A combo PPG-ECG system has been developed and employed to extract both the ECG signal from standard limb leads and simultaneously the photoplethysmography signal from the wrist and the forearm, to calculate the pre-ejection period. This system represents an easy and non-invasive technique to determine these biomedical parameters without using expensive impedance cardiography equipment.
Recovering Sicilian Silk Heritage through Digital Technologies: The Case of Piraino’s Collection
2022
Textile conservation has given rise to small and medium-sized museums, usually with scarce resources. In Sicily, the little evidence that remains of silk production and opulent imports by the rich and powerful local aristocracy is kept in museums, parishes, and other cultural institutions. The documentation, dissemination, and enhancement of such a fragile heritage is today possible by means of technological tools that provide novel means to preserve, analyze, and exploit digital information. In this paper, we present some outcomes of the SILKNOW project, a project that applies computing research to the needs of diverse users (museums, educational institutions, the tourism industry, creativ…
Osservazioni fitosociologiche su aspetti di vegetazione a Prunus mahaleb subsp. cupaniana (Rosaceae) dei Monti Madonie (Sicilia)
2010
Zinc Adsorption by Activated Carbon Prepared from Lignocellulosic Waste Biomass
2019
Sawdust was used as a precursor for the production of biomass-based activated carbon. Carbonization and activation are single-stage processes, and steam was used as a physical activation agent at 800 °
H1-antihistamines suppress wheal-and-flare reaction and skin blood perfusion measured by Laser Dopppler flowmetry: randomized, double-blind, placebo-…
2010
H1-antihistamines suppress wheal-and-flare reaction and skin blood perfusion measured by Laser Dopppler flowmetry: randomized, double-blind, placebo-controlled, crossover design study The aim of our study was to compare the influence of pre-treatment with H1-antihistamines (levocetirizine, desloratadine, clemastine, quifenadine, and sequifenadine) and a placebo on the histamine-induced weal and flare reaction, increase of skin blood perfusion and sedation. Thirty healthy volunteers were enrolled in the study. The study design was a prospective, randomised, double-blind, placebo-controlled, crossover, balanced clinical trial. Volunteers in randomised and double-blind order were treated with …
Datortomogrāfijas protokola pielietošana smadzeņu nāves apstiprināšanai
2020
Bakalaura darba tēma ir “Datortomogrāfijas protokola pielietošana smadzeņu nāves apstiprināšanā”. Attīstoties intensīvās terapijas un transplantoloģijas nozarēm, smadzeņu nāves diagnostikā nepieciešams papildus veikt izmeklējumus, kas nodrošina ātru un efektīvu rezultātu, veicot apstiprinājumu smadzeņu nāves diagnozei. Datortomogrāfijas angiogrāfija ir viens no tiem. Bakalaura darba izvirzītā hipotēze ir: datortomogrāfijas protokols smadzeņu nāves apstiprināšanai katrā slimnīcā ir atšķirīgs. Darba mērķis ir noskaidrot datortomogrāfijas protokola pielietošanu smadzeņu nāves apstiprināšanai 3 Latvijas slimnīcās. Pētniecības uzdevumi ir apkopot un analizēt literatūru par galvas smadzeņu anatom…