Akcent

Akcent (pronounced "ascent", not "ak-cent"), originally a wordplay on accent is a multi-certified, award-winning Romanian dance pop act whose members sing in Romanian, English, Polish and Spanish. The group consists of Adrian Sînă, the creator of the group. In late 1998, he was joined by Romanian pop singer Ramona Barta to create the duo called Akcent. The two released their debut single — "Ultima vara" (The last summer) along with the debut album, entitled Senzatia - The Sensation. After a spare of time, the duo disbanded and Sina brought Marius Nedelcu, Mihai Gruia and Sorin Brotnei to the group, changing it from a mixed duo to a boyband. They came to prominence once with the release of their hit single "Ti-am promis" (I promised you).

The climax of the group's career was the international release of their breakthrough single "Kylie", the English version of their internal hit "Dragoste de inchiriat". The song reached the peak position in many European charts and fared well enough in countries such as the Netherlands and France. They even participated in the Selecția Națională, with hopes of representing Romania in the Eurovision Song Contest. They united with pop singer Nicoleta Matei and entered the song "Jockero" which failed to win. Nevertheless, it became yet another number-one single on the Romanian Top 100 for the band. All through late 2000s and early 2010s, their success was continued.

Adrian Sînă

Adrian Claudiu Sînă (born April 18, 1977), better known as Adrian Sina or simply Adi Sina is a Romanian singer-songwriter, record producer, radio DJ and entertainer. He is best known for creating, producing and singing in the dance group Akcent and also for writing and producing mainstream hit songs for himself and other international artists. He started out as a disc jockey in the 1990s and then created a group with his fellow musician Ramona Barta. He came to prominence as a member of Akcent with the song "Ultima varǎ" (The Last Summer) in 1999. His group was joined by Marius Nedelcu, Sorin Brotnei and Mihai Gruia. Together they scored multiple number-one hits both in Romania and throughout Eastern Europe, especially in the mid-2000s. Their albums have been certified multi-Platinum by the Uniunea Naţională a Producătorilor de Fonograme din România and were sold in millions of copies worldwide. Their signature song was "Kylie", released in 2005.

In the early 2010s, Sina decided to release himself in a solo career and co-opted various recording artists on his side. He started his own record label, Premium Artist (formerly known as Sisterhoodlive Records) and he recorded some solo hits, such as "Hold On", "I Can't Live Without You" or "Angel". In 2011 he was also on the judging panel of the Romanian X Factor where he coached the over 25s. In the meantime, he managed to produce and write several number-one and top-ten hits for up-and-rising artists such as boyband Maxim and songstress Lidia Buble. He released a single, entitled "Arde ceva" (Something Burning) which was released in 2013. Songs "Lacrimi curg" and "Tu m-ai dat gata" followed, and his latest release is a collaboration with Cojo, namely "Zile bune, zile rele".

Roton

In theoretical physics, a roton is an elementary excitation, or quasiparticle, in superfluid helium-4. The dispersion relation of elementary excitations in this superfluid shows a linear increase from the origin, but exhibits first a maximum and then a minimum in energy as the momentum increases. Excitations with momenta in the linear region are called phonons; those with momenta close to the minimum are called rotons. Excitations with momenta near the maximum are sometimes called maxons.

The term "roton" is also used for the quantised eigenmode of a freely rotating molecule.

Models

Originally, the roton spectrum was phenomenologically introduced by Lev Landau. Currently there exist different models which try to explain the roton spectrum, with a different degree of success and fundamentality. The requirement for any model of such kind is that it must explain not only the shape of the spectrum itself but also other related observables, such as the speed of sound and structure factor of superfluid helium-4. Microwave and Bragg spectroscopy has been conducted on helium to study roton spectrum.

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