Search results for "SO 2"
showing 5 items of 5 documents
On the Derivatization of Drugs Using 1-Nitroso-2-naphthol, 4-aminoantipyrine and 2,6-Dihaloquinone Chlorimides
1992
Coupling of 1-nitroso-2-naphthol (1N2N), 4-aminoantipyrine (4-AAP), 2,6-dichloroquinone chlorimide (DCQC) and 2,6-dibromoquinone chlorimide (DBQC) with several bioactive substances, including adren...
Ground-Based measurements of the 2014-2015 holuhraun volcanic cloud (Iceland)
2018
he 2014–2015 Bárðarbunga fissure eruption at Holuhraun in central Iceland was distinguished by the high emission of gases, in total 9.6 Mt SO2, with almost no tephra. This work collates all ground-based measurements of this extraordinary eruption cloud made under particularly challenging conditions: remote location, optically dense cloud with high SO2 column amounts, low UV intensity, frequent clouds and precipitation, an extensive and hot lava field, developing ramparts, and high-latitude winter conditions. Semi-continuous measurements of SO2 flux with three scanning DOAS instruments were augmented by car traverses along the ring-road and along the lava. The ratios of other gases/SO2 were …
Long-term ISO 23936-2 sweet oil ageing of HNBR
2021
Abstract A hydrogenated nitrile butadiene rubber (HNBR) compound is subjected to ageing in a simulated oil and gas environment in accordance with ISO 23936-2 standard at two elevated temperatures (130 °C and 150 °C) for a period of up to 9 months. Shore D hardness, thermal expansion, dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR) spectroscopy, compression and compression set (CS) measurements are made before and after the chemical exposure. The hardness, modulus at short times, degree of relaxation and CS increases while the coefficient of thermal expansion in HNBR tends to decrease with ageing time and temperature. Temperature is shown to impose a greater effect on th…
Joaquín Sorolla y su paso por el Ateneo de Madrid
2018
Informāciju tehnoloģiju drošības pārvaldības uzlabošana uzņēmumā
2017
Mūsdienās informācijas tehnoloģiju drošībai tiek pievērsta arvien lielāka uzmanība uzņēmējdarbības vidē, saistībā ar pieaugošo incidentu skaitu. Drošības pārvaldībai ir ļoti svarīga loma, lai uzņēmumi varētu nodrošināt biznesa nepārtrauktību, informācijas neizpaušanu, kā rezultātā nestu papildus pievienoto vērtību klientiem un veicinātu uzticamību investoru vidū. Bieži vien uzņēmumi uzbrukumu rezultātā cieš zaudējumus, taču neizpauž šo informāciju publiski, tādējādi pakļaujot riskam ne tikai uzņēmumu, bet arī tā klientus. Diplomdarba mērķis ir, pamatojoties uz informācijas tehnoloģiju pārvaldības drošības standartiem, veikt uzņēmuma drošības novērtēšanu un izstrādāt priekšlikumus informācij…