Search results for " VAN"
showing 10 items of 209 documents
First in-situ measurements of plume chemistry at mount garet volcano, island of gaua (Vanuatu)
2020
Recent volcanic gas compilations have urged the need to expand in-situ plume measurements to poorly studied, remote volcanic regions. Despite being recognized as one of the main volcanic epicenters on the planet, the Vanuatu arc remains poorly characterized for its subaerial emissions and their chemical imprints. Here, we report on the first plume chemistry data for Mount Garet, on the island of Gaua, one of the few persistent volatile emitters along the Vanuatu arc. Data were collected with a multi-component gas analyzer system (multi-GAS) during a field campaign in December 2018. The average volcanic gas chemistry is characterized by mean molar CO2/SO2, H2O/SO2, H2S/SO2 and H2/SO2 ratios …
Gustavs Vanags un viņa mantojums
2021
Par godu ķīmiķa organiķa Gustava Vanaga (1891-1965) 130. dzimšanas gada dienai apkopota profesora Vanaga biogrāfija, kurā iekļauta informācija no Gustavam Vanagam veltītajām biogrāfijas grāmatām un Latvijas ķīmijas vēstures muzeja krājumā esošajiem memoriālajiem materiāliem.
Topical application of the Wnt/β-catenin activator methyl vanillate increases hair count and hair mass index in women with androgenetic alopecia
2016
Activation of the WNT/β-catenin pathway has emerged as a potential therapeutic target in androgenetic alopecia (AGA). Methyl vanillate (MV) - a safe plant-derived ingredient - has been recently shown to activate the WNT/β-catenin signaling. Objectives Two distinct substudies were conducted. First, we designed a 6-month, uncontrolled, open-label clinical study to investigate whether topically applied MV may increase hair count and hair mass index (HMI) in female AGA. Second, we conducted a molecular study on the effect of MV on WNT10B mRNA expression in scalp biopsies of women with AGA. A total of 20 Caucasian women (age range: 25-57 years) with AGA (Sinclair grade 1-2) were included. The re…
Covariation of spectral and nonlinear EEG measures with alpha biofeedback.
2002
Item does not contain fulltext This study investigated how different spectral and nonlinear EEG measures covaried with alpha power during auditory alpha biofeedback training, performed by 13 healthy subjects. We found a significant positive correlation of alpha power with the largest Lyapunov-exponent, pointing to an increased dynamical instability of the EEG accompanying alpha enhancement. Alpha power amplification, moreover, was significantly correlated with a decrease of spectral entropy within the alpha range. This outcome reflects a sharpening of the alpha peak during biofeedback training. The fact that the sharpening effect clearly preceded the increase of alpha amplitude could be exp…
Tuning The Selectivity To Aldehyde Via Ph Regulation In The Photocatalytic Oxidation Of 4-Methoxybenzyl Alcohol And Vanillyl Alcohol By Tio2 Catalysts
2021
Abstract The influence of pH on the photocatalytic partial oxidation of 4-methoxybenzyl alcohol (MBA) and vanillyl alcohol (VA) to their corresponding aldehydes in aqueous suspension under UVA irradiation was investigated by using poorly crystalline home-prepared and crystalline commercial TiO2 (BDH, Merck and Degussa P25) photocatalysts. The results clearly show as tuning pH can strongly impart selectivity and activity to photocatalytic processes which are often quite unselective in aqueous suspensions. It was found that pH effect on reaction rate and product selectivity strongly depended on TiO2 crystallinity and substrate type. In the case of MBA oxidation, photoreactivity and selectivit…
Templated growth of smart nanocomposite thin films: Hybrid aerosol assisted and atmospheric pressure chemical vapour deposition of vanadyl acetylacet…
2009
Hybrid aerosol assisted and atmospheric pressure chemical vapour deposition methodology has been utilised to produce nanocomposite thin films of gold nanoparticles and vanadium dioxide from vanadyl acetylacetonate and auric acid. The addition of tetraoctyl ammonium bromide (TOAB) to the precursor Solution gave control of the size and distribution of gold nanoparticles in the vanadium oxide matrix. These reactions led to vanadium dioxide films with reduced crystallite sizes and enhanced thermochromic properties. The films were analysed by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Their optical and thermochromic behaviour was also determined, This h…
Alfredo Baeschlin y la arquitectura popular vanguardista, Ibiza 1933-1934
2011
El artículo pretende reflexionar sobre la casuística profesional y personal de Alfredo Baeschlin como paradigma de una época intrincada en el modo de entender la vida, las relaciones sociales y la profesión vinculada a la arquitectura como vía de aproximación entre la arquitectura tradicional y las corrientes arquitectónicas más vanguardistas. Para ello, se propone un análisis sobre lo que sucedió en Ibiza, isla conocida por sus flirteos con la modernidad, y escuela experimental, vital, emocional, idílica y utópica para intelectuales que buscaron un trance temporal que reordenara o aireara sus percepciones mediante una profunda inmersión en un mundo luminoso, espacioso y ancestral donde sól…
Lammi
Viesnīcas "Hotel Vantis" darbības analīze un attīstības perspektīvas
2016
Bakalaura darba ietvaros, autore, kura ir arī viesnīcas „Hotel Vantis” darbiniece, bija ieinteresēta izpētīt viesnīcas darbību un piedāvāt risinājumus „Hotel Vantis” darbības uzlabošanai. Lai labāk izprastu vai viesnīcas darbība ir veiksmīga vai nē, bija nepieciešams izpētīt arī Latvijas tūrisma nozari kopumā un statistiku par laika periodu 2012.-2014.gadam. Darba gaita izskatīti tūrisma nozares attīstības un kvalitātes noteikšanas institūciju - Latvijas viesnīcu un restorānu aģentūras, Tūrisma attīstības valsts aģentūras – darbības principi un uzdevumi, kā arī izpētītas pamatnostādnes tūrisma nozares attīstībai 2015.-2020.gadam. Veikta viesnīcas „Hotel Vantis” finanšu analīze, lai noskaidr…
Improved composite materials for rechargeable lithium metal polymer batteries
1999
Abstract The performance of several polymer electrolytes for lithium metal batteries for electric vehicle applications are reported. The best performing electrolyte is the composite PEO 20 LiCF 3 SO 3 –γLiAlO 2 , which was prepared by a solvent-free procedure. It showed coulombic efficiency values of the lithium deposition–stripping process of 94%–96%. Electrochemical tests of lithium polymer battery (LPB) prototypes based on a 3 V LiMn 2 O 4 composite cathode material laminated together with the PEO 20 LiCF 3 SO 3 –γLiAlO 2 electrolyte gave promising results for electric vehicle applications. Even under non-optimized battery design, the prototypes delivered, at the C/3 rate and at 94°C, 40…