Suorasanaisia kirjoitelmia

Sisältää: Virsiä / suom. Alpo Noponen. En voi: kaksinäytöksinen perhekuvaus / suom. O. Manninen. Salamiin kuninkaat: viisinäytöksinen murhenäytelmä / suom. O. Manninen. Suorasanaisia kirjoitelmia / suom. Juhani Ah

Few-electron quantum dots and disks in zero magnetic field: Possible indications on a liquid-solid transition

Exact-diagonalization studies of few-electron quantum dots and disks are performed, with the aim to investigate a Wigner cluster -- Fermi liquid crossover in zero magnetic field at varying strength of Coulomb interaction. A clear indication of a transition of a liquid-solid type in the ground state is found in a more adequate quantum-disk model.Comment: 4 pages, incl 3 figures, contribution to the Proceedings of EP2DS-14, submitted to Physica E, one figure is updated, with corresponding changes in the text, typos are remove

Study of strange particle production in pp collisions with the ALICE detector

ALICE is well suited for strange particles production studies since it has very good reconstruction capabilities in the low transverse momentum ($p_{t}$) region and it also allows to extend the identification up to quite high $p_{t}$. Charged strange mesons (\kp, \km,) are reconstructed via energy loss measurements whereas neutral strange mesons (\ks) and strange hyperons (\lam, $\Xi$, $\Omega$) are identified via vertex reconstruction. All these particles carry important information: first, the measurement of production yields and the particle ratio within the statistical models can help to understand the medium created and secondly the dynamics at intermediate $p_{t}$ investigated via the baryon over meson ratio (\lam / \ks) allows a better understanding of the hadronization mechanisms and of the underlying event processes. We present these two aspects of the strange particles analysis in pp collisions using simulated data.Comment: Proceeding SQM (2009), 5 figures, 6 page

Periodic giant-persistent current in sharp pulses on a ring

We show here a mesoscopic device based on a narrow ring containing an electron. In the device, an amount of energy is stored in advance. Similar to the pendulum, an exact periodic motion of the electron is thereby initiated afterward. The motion appears as a series of sharp pulses, and is in nature different from the well known Aharonov-Bohm (A-B) oscillation. In particular, the pulses of current can be tuned to be very strong (say, more than two orders stronger than the usual A-B current). Related theory and numerical results are presented.Comment: 5 pages, 5 figure

Gaming techniques and the product development process : commonalities and cross-applications

The use of computer-based tools is now firmly embedded within the product development process, providing a wide range of uses from visualisation to analysis. However, the specialisation required to make effective use of these tools has led to the compartmentalisation of expertise in design teams, resulting in communication problems between individual members. This paper therefore considers how computer gaming techniques and strategies could be used to enhance communication and group design activities throughout the product design process

Hartree-Fock dynamics in highly excited quantum dots

Time-dependent Hartree-Fock theory is used to describe density oscillations of symmetry-unrestricted two-dimensional nanostructures. In the small amplitude limit the results reproduce those obtained within a perturbative approach such as the linearized time-dependent Hartree-Fock one. The nonlinear regime is explored by studying large amplitude oscillations in a non-parabolic potential, which are shown to introduce a strong coupling with internal degrees of freedom. This excitation of internal modes, mainly of monopole and quadrupole character, results in sizeable modifications of the dipole absorption.Comment: 4 pages, 4 embedded figure