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Azure DevOps Server (previously known as TFS) allows you to work in the cloud or on-premises using Azure DevOps Services. This book will help you iteratively develop high quality secure software using Agile techniques. You will also learn to develop your own extensions and release them to millions of developers in the Visual Studio Marketplace

Optical properties of Eu3+ doped lead borate tellurite and zinc borate tellurite glasses

This paper describes the synthesis and optical absorption studies of the glass system 20PbO-20TeO2-(60-x)B2O3-xEu 2O3 (x=0,1mol) and 20ZnO-20TeO2-(60-x)B 2O3-xEu2O3 (x=0,1mol). These glass systems have been successfully prepared by the melt quenching technique. The X-ray diffractograms show broad peaks indicating glasses are amorphous. DSC thermograms show glass transition temperatures around 655K for PbO content and around 675 K for ZnO content glass samples. In the UV-Visible spectra, several absorption lines are observed. The absorption peaks are around 362, 375, 393 and 464 nm for both Eu3+ doped PbO and ZnO content glass systems. These correspond to transitions from ground state of 7F0 to the excited state of 5D4, 5G4, 5L6 and 5D2 respectively for both Eu3+ doped PbO and ZnO content glass systems. These glasses are expected to give interesting applications in the area of optical devices. © 2011 American Institute of Physics

Optical and radiative properties of Nd3+-doped lead tellurite borate glasses

Glass samples of composition (in mol) 20PbO-20TeO2-(60-x)B 2O3-xNd2O3 (x = 0, 1, 2, 3, 4) were prepared by melt quenching. The glassy nature of as-quenched samples was established via differential scanning calorimetry. The amorphous nature of the glasses was confirmed via powder X-ray diffraction measurements. Judd-Ofelt (JO) analysis based on UV-visible absorption spectra was performed to determine JO parameters Ωλ (λ = 2, 4, 6). The observed trend is Ω2 > Ω6 > Ω4. The large value of Ω2 indicates the presence of covalent bonding between the Nd3+ ions and the surrounding ligands. Radiative properties, such as radiative transition probabilities, branching ratios, and radiative lifetimes are estimated. The glass samples have relatively high branching ratio, and their emission (Aem) to excited state absorption (AESA) intensity ratio is higher than one for the 4F 3/2 â 4I11/2 transition, indicating that the prepared glasses may have potential laser applications. © 2013 Published by NRC Research Press