Search results for "MT"

Strongly Coupled Coherent Phonons in Single-Layer MoS 2

2019

We present a transient absorption setup combining broadband detection over the visible-UV range with high temporal resolution ($\sim$20fs) which is ideally suited to trigger and detect vibrational coherences in different classes of materials. We generate and detect coherent phonons (CPs) in single layer (1L) MoS$_2$, as a representative semiconducting 1L-transition metal dichalcogenide (TMD), where the confined dynamical interaction between excitons and phonons is unexplored. The coherent oscillatory motion of the out-of-plane $A'_{1}$ phonons, triggered by the ultrashort laser pulses, dynamically modulates the excitonic resonances on a timescale of few tens fs. We observe an enhancement by…

Melleņu rametu struktūras raksturojums dažādās mežaudzēs

2016

Bakalaura darbs – ‘’Melleņu rametu struktūras raksturojums dažādās mežaudzēs’’ izstrādāts laika posmā no 2014. gada augusta līdz 2016. gada maijam Latvijas Universitātes, Bioloģijas fakultātes, Botānikas un ekoloģijas katedrā un Latvijas Valsts mežzinātnes institūtā ‘’Silava’’. Darbā izmantoti Lindas Robaltes maģistra darba laikā ievāktie melleņu rametu struktūru dati (vecums, diametrs un augstums) (Robalte 2014). Par pētījuma vietu izvēlētas divas dažādas teritorijas – dabas liegums ‘’Gruzdovas meži’’ vecāko apzināto egļu dēļ (~ 273 gadi) un Slīteres nacionālā parka teritorija, jo arī tajā koki sasnieguši līdzīgu vecumu, bet tajā ir tipiskāki augšanas apstākļi mellenēm. Katrā no teritorijā…

Population et territoire: une incessante recomposition

2001

Un an après la parution des premiers résultats du recensement général, que dire de l'évolution de la population en Franche-Comté ? Au-delà des chiffres agrégés qui fournissent une image incomplète d'une réalité rendue toujours plus complexe par les migrations, interrogeons-nous sur quelques indicateurs capables de traduire l'extrême diversité des situations communales tout en conservant une approche géographique permettant de mettre en évidence des régularités spatiales.

Mīts par Tristānu un Izoldi 20.gs. pirmās puses krievu literatūras kontekstā

2014

Anotācija Promocijas darbā pētīta Tristana un Izoldes mīta recepcija 20. gadsimta pirmās puses krievu kultūrā. Darbā apkopoti un analizēti poētiskie teksti (vairāk nekā 25), kas veidojuši Tristana un Izoldes sižeta konceptuāli vienoto krievisko invariantu. Īpaša uzmanība pievērsta divām galvenajām problēmām: pieprasījumam pēc šī sižeta 19.gadsimta beigas un 20.gadsimta sakuma krievu kultūrā un leģendas avotu, svarīgu krievu sabiedrībai, noskaidrošanai. Pētījums atklāj, ka šī mīta recepcija krievu kultūrā ir sarežģīts un heterogēns process, kam par impulsu kalpojuši krievu autoru personiskie kontakti ar Vāgneru, neomītisma ietvarā aktualizētā interese par pagājušo laikmetu literatūru, kā arī…

Photocycle of point defects in highly- and weakly-germanium doped silica revealed by transient absorption measurements with femtosecond tunable pump.

2022

AbstractWe report pump-probe transient absorption measurements addressing the photocycle of the Germanium lone pair center (GLPC) point defect with an unprecedented time resolution. The GLPC is a model point defect with a simple and well-understood electronic structure, highly relevant for several applications. Therefore, a full explanation of its photocycle is fundamental to understand the relaxation mechanisms of such molecular-like systems in solid state. The experiment, carried out exciting the sample resonantly with the ultraviolet (UV) GLPC absorption band peaked at 5.1 eV, gave us the possibility to follow the defect excitation-relaxation dynamics from the femto-picosecond to the nan…

Ladoix-Serrigny (Côte-d’Or). Chapelle Notre-Dame du Chemin [notice archéologique]

2019

La chapelle Notre-Dame du Chemin est un site emblématique de la côte viticole, à environ 5 km au NE de Beaune, sur le territoire de la commune de Ladoix-Serrigny en Côte-d’Or. Le diagnostic archéologique réalisé au pied de l’actuel édifice s’est déroulé du 5 au 9 mars 2018. En dépit d’une emprise limitée au fuseau d’un futur réseau de drainage, l’opération a permis de documenter l’évolution de l’environnement de la chapelle depuis la fin du premier Moyen Âge jusqu’à nos jours. La sépulture d’un individu adulte, aménagée de dalles de calcaire, datée par radiocarbone des XIe-XIIe s., constitue le témoignage le plus ancien de l’occupation humaine du site [...]

DEVELOPMENT OF A NEW SATURATED VAPOUR-ANODE, SATURATED VAPOUR-CATHODE AMTEC-LIKE DEVICE

Grāmatniecība un bibliogrāfija Latvijā 20. un 21. gadsimtā: nozīmīgākie sasniegumi

2018

A methodology for the control of the residual lifetimes of carbon fibre reinforced composite pressure vessels

2005

International audience; Pressure vessels must be periodically proof tested. Traditional techniques for metal vessels are inapplicable for composite vessels as the latter do not break by crack propagation so that the reasoning behind the traditional testing procedures is not appropriate. Damage accumulation leading to the degradation of a composite vessel is by fibre failure. Fibres show a wide distribution in strengths and loading a composite inevitably breaks some. The method which has been developed is supported by an analysis of delayed fibre failure due to the relaxation of the resin around fibre breaks. This provokes overloading of intact fibres neighbouring breaks. The time until a cr…

A novel microtubule de-stabilizing complementarity-determining region C36L1 peptide displays antitumor activity against melanoma in vitro and in vivo

2015

AbstractShort peptide sequences from complementarity-determining regions (CDRs) of different immunoglobulins may exert anti-infective, immunomodulatory and antitumor activities regardless of the specificity of the original monoclonal antibody (mAb). In this sense, they resemble early molecules of innate immunity. C36L1 was identified as a bioactive light-chain CDR1 peptide by screening 19 conserved CDR sequences targeting murine B16F10-Nex2 melanoma. The 17-amino acid peptide is readily taken up by melanoma cells and acts on microtubules causing depolymerization, stress of the endoplasmic reticulum and intrinsic apoptosis. At low concentrations, C36L1 inhibited migration, invasion and proli…