Search results for " engineering"

Photoluminescence properties of S2 molecule trapped in Melanophlogite

2015

We studied the photoluminescence properties of a sample of SiO2-clathrate Melanophlogite, a crystalline microporous material which is found in nature as a rare mineral. Upon β irradiation, the material displays an intense light emission under near-UV illumination. We studied in detail this optical activity by steady-state and time-resolved photoluminescence measurements as a function of temperature. The spectroscopic properties we find can be ascribed to a population of quasi-free molecules trapped within each of the two different types of cage available in the structure of this clathrate, although the spectroscopic properties of the guest molecules are affected by their interactions with t…

Ground and first excited electronic state interaction of FAD with some β-carboline derivatives

1987

Abstract The spectrophotometric and thermodynamic properties of molecular complexes of flavine adenine dinucleotide (FAD) with some dihydro β-carboline derivatives have been investigated in aqueous solution. The molecular associations have been examined by means of electronic absorption spectra, since in each a new charge-transfer band has been located, and also the variation of the fluorescence emission of FAD on the solutions has been observed. The formation constants for the molecular complexes were determined from absorption data, using the Foster-Hammick-Wardley method. The quenching fluorescence phenomena observed in FAD is related to the concentration of the dihydro β-carboline deriv…

Что сдѣлано и что дѣлается нашимъ городскимъ управленіем?

1913

Краткая историческая справка развития и переустройства Рижского железнодорожного узла к открытию Александровского Путепровода в городе Риги

1905

Nosaukums uz vāka: Къ открытію Александровскаго путепровода въ гор. Ригѣ, 1904-1905.

Записка о проведении железной дороги через Лифляндскую губернию

1875

Содержание: Записка о проведеніи желѣзной дороги чрезъ Лифляндскую губернію : Лифляндская хлѣбная промышленность ; Вывозъ зерна ; Вывозъ льна и льнянаго сѣмени ; Стоимость провоза ; Лифляндское винокуреніе ; Денежное хозяйство и аренды ; Цѣнность и доходность земли. Подати ; Перновъ ; Ввозъ ; Торговый оборотъ Риги ; Кенигсбергскій портъ ; Лифляндская фабричная промышленность ; Производительность ; Винокуреніе и пивовареніе ; Направленіе линій желѣзныхъ дорогъ ; Значеніе различныхъ линій ; Направленіе Риго-Псковской желѣной дороги и вѣтьвь къ Дерпту ; Направленіе отъ Дерпта чрезъ Островъ на Вязьму ; Общія замѣчанія ; Стратегическое значеніе линіи ; Доходность.

О разрѣшеніи производства работъ по улучшенію Рижскаго порта: въ Государственную думу, изложеніе дѣла и соображенія [О разрешении производства работ …

1909

Teksts mašīnrakstā.

Tar ekun fabrika

1933

Apskats par rūpniecību sociālisma un kapitālisma sistēmā. Tulkojums no krievu valodas evenku valodā.

The impact of different nations and cultures on the development of latvian cuisine. The materials from the Academic Library of the University of Latv…

2021

Underground investigation of extensive air showers spectra at high energy range of cosmic rays and other research in the Pyhäsalmi mine

2020

Abstract High energy particles reaching the Earth’s atmosphere are known as cosmic rays. As a result of interactions with nuclei of air molecules, cosmic rays induce showers of secondary particles, which can be divided into 3 components: electromagnetic, hadronic and muonic components. The Experiment with Multi Muon Array (EMMA), located at the depth of 75 m in the Pyhäsalmi mine in Finland, investigates the muonic component of the Extensive Air Showers (EAS) to deduce the direction, energy, and the mass of the primary cosmic ray particles. In this paper we give a concise description and methodology used by EMMA followed by a brief review of the C14 experiment. Finally, we review the feasib…

On-Demand Security Framework for 5GB Vehicular Networks

2023

Building accurate Machine Learning (ML) at-tack detection models for 5G and Beyond (5GB) vehicular networks requires collaboration between Vehicle-to-Everything (V2X) nodes. However, while operating collaboratively, ensuring the ML model’s security and data privacy is challenging. To this end, this article proposes a secure and privacy-preservation on-demand framework for building attack-detection ML models for 5GB vehicular networks. The proposed framework emerged from combining 5GB technologies, namely, Federated Learning (FL), blockchain, and smart contracts to ensure fair and trustedinteractions between FL servers (edge nodes) with FL workers (vehicles). Moreover, it also provides an ef…