Search results for " element"
showing 10 items of 2679 documents
Key challenges of new and small virtual team
2007
The purpose of this thesis is to study the factors must be noticed when building a new and small virtual team. These virtual teams are groups of people who work together without the boundaries of time or space using technology (Lipnack & Stamps 2000, 18). The main goal is to study in detail some of the common challenges faced when working with the small virtual teams, especially in the early stages of team development. With this study and the results of it, the reader is aware of the challenges of virtual teams and the differences and similarities between traditional and virtual teams. In addition the reader knows also some factors that must be noticed when a new small virtual team is suppo…
Addition of Ethylene or Hydrogen to a Main-Group Metal Cluster under Mild Conditions
2015
Reaction of the tin cluster Sn8(Arinline image)4 (Arinline image=C6H2-2,6-(C6H3-2,4,6-Me3)2) with excess ethylene or dihydrogen at 25 °C/1 atmosphere yielded two new clusters that incorporated ethylene or hydrogen. The reaction with ethylene yielded Sn4(Arinline image)4(C2H2)5 that contained five ethylene moieties bridging four aryl substituted tin atoms and one tin–tin bond. Reaction with H2 produced a cyclic tin species of formula (Sn(H)Arinline image)4, which could also be synthesized by the reaction of {(Arinline image)Sn(μ-Cl)}2 with DIBAL-H. These reactions represent the first instances of direct reactions of isolable main-group clusters with ethylene or hydrogen under mild conditions…
Low‐Valent Germanylidene Anions: Efficient Single‐Site Nucleophiles for Activation of Small Molecules
2021
Abstract Rare mononuclear and helical chain low‐valent germanylidene anions supported by cyclic (alkyl)(amino)carbene and hypermetallyl ligands were synthesised by stepwise reduction from corresponding germylene precursors via stable and isolable germanium radicals. The electronic structures of the anions can be described with ylidene and ylidone resonance forms with the Ge−C π‐electrons capable of binding even weak electrophiles. The germanylidene anions reacted with CO2 to give μ‐CO2‐κC:κO complexes, a rare coordination mode for low‐valent germanium and inaccessible for the related neutral germylones. These results implicate low‐valent germanylidene anions as efficient single‐site nucleop…
THE IMPACT OF VOLCANIC EMISSIONS ON ETNA’S SNOW COVER
2011
Solai in legno e gesso
2010
Terzo di una sequenza di tre articoli con i primi esiti di uno studio condotto al fine di sviluppare ipotesi progettuali per una particolare tipologia di solaio con struttura in legno lamellare, casseri di alleggerimento in conglomerato di gesso e aggregati, nonché finiture prevalentemente in gesso e in materiali a basso costo. Si presentano gli esiti progettuali: dal sistema nel suo complesso allo studio dei dettagli più minuti e delle modalità di posa in opera. L’ambito produttivo a cui si riferisce il sistema è soprattutto quello dell’intervento sull’esistente: esso presenta problematiche tecniche specifiche cui il sistema potrebbe far fronte e predilige la scelta di operare nell’ambito …
Numerical simulation of fluid-structure interaction between acoustic and elastic waves
2011
Electron spectra in forbidden β decays and the quenching of the weak axial-vector coupling constant gA
2017
Evolution of the electron spectra with the effective value of the weak axial-vector coupling constant gA was followed for 26 first-, second-, third-, fourth- and fifth-forbidden β− decays of odd-A nuclei by calculating the involved nuclear matrix elements (NMEs) in the framework of the microscopic quasiparticle-phonon model (MQPM). The next-to-leading-order terms were included in the β-decay shape factor of the electron spectra. The spectrum shapes of third- and fourth-forbidden nonunique decays were found to depend strongly on the value of gA, while first- and second-forbidden decays were mostly unaffected by the tuning of gA. The gA-driven evolution of the normalized β spectra was found t…
Acetic acid leaching of neodymium magnets and iron separation by simple oxidative precipitation
2022
Neodymium-iron-boron (NdFeB) has become the most prominent permanent magnet alloy, with a wide variety of applications and an ever-increasing demand. Their recycling is important for securing the supply of critical raw materials used in their manufacturing. The use of organic acids such as acetic acid has been of recent interest for the recycling of waste NdFeB magnets. Despite achieving good leaching efficiencies, the published literature has not properly investigated the effects of key factors influencing the acetic acid leaching process and their respective interactions, which has lead to conflicting findings as to what conditions are optimal. The present work goes to show that no such o…
Atgriezeniskās saites startēģijas mācīšanās kultūras veicināšana pamatskolā
2019
Viena no neatņemamajām sastāvdaļām mācību procesā ir pastāvīgi saņemt atgriezenisko saiti. Izmantojot iegūto informāciju, atgriezeniskā saite palīdz skolēniem labāk saprast, cik lielā mērā mūsu pašu priekšstati par sevi, vai paveikto sakrīt ar citu iesaistīto cilvēku redzējumu, un, kas darāms tālāk. Atgriezeniskā saite palīdz pilnveidoties pamatīgāk iedziļinoties, kā arī labāk aptvert likumsakarības, turklāt, tas atspoguļo skolēnu mācīšanās kultūru, viņu attieksmi pret mācību procesu. Diplomdarba mērķis ir pētīt un apzināties atgriezeniskās saites stratēģiju nozīmi, uzlabojot mācīšanās procesu darbā ar skolēniem pamatskolā.Pētījums tika veikts Rīgas Valda Zālīša pamatskolā, kurā piedalījās …
Spēles elementu izmantošana vārdu krājuma un gramatisko formu apgūšanai krievu valodas kā svešvalodas stundās 4. klasē
2022
Latvijas Izglītības un zinātnes ministrijas apstiprinātajā izglītības programmā, 4.klašu skolēniem tiek piedāvāta otrās svešvalodas apguves izvēle. Skolēni, kuri izvēlas apgūt krievu valodu, bieži vien saskaras ar dažādām grūtībām vārdu krājuma un gramatikas formu apgūšanā, kas saistītas ar alfabēta atšķirībām, izrunas, frāžu un teikumu uzbūves specifiku. Dotajā diplomdarbā, pamatojoties uz teorētisko materiālu un tā praktisko pielietojumu, ir apskatītas spēles elementu izmantošanas iespējas vārdu krājuma un gramatikas formu apgūšanai krievu valodas kā svešvalodas stundās 4.klasē. Saskaņā ar veiktā pētījuma rezultātiem, kurā piedalījās 27 skolēni, tika noteikti spēļu veidi, kurus var ieteik…