Formiranje polarona: studij malih nakupina

The effect of electron-phonon coupling on the formation of bipolarons is considered in both adiabatic and antiadiabatic regimes. Within the two-site Holstein-Hubbard model, it is shown that fast phonons can influence the formation for both repulsive and attractive effective on-site interactions.Učinak elektron-phonon vezanja na formiranje bipolarona razmatra se kako u adijabatskom tako i u antiadijabatskom režimu. U okviru Holstein-Hubbardovog modela s dva centra pokazano je da brzi fotoni mogu utjecati na ovo formiranje kako za odbojna tako i za privlačna međudjelovanja među česticama jednog centra

Unusual conductance of polyyne-based molecular wires

We report a full self-consistent ab initio calculation of the current-voltage curve and the conductance of thiolate capped polyynes in contact with gold electrodes. We find the conductance of polyynes an order of magnitude larger compared with other conjugated oligomers. The reason lies in the position of the Fermi level deep in the HOMO related resonance. With the conductance weakly dependent on the applied bias and almost independent of the length of the molecular chain, polyynes appear as nearly perfect molecular wires.Comment: 4 pages, 5 figures, 3 table

The Non-Ideal Organic Electrochemical Transistors Impedance

Organic electrochemical transistors offer powerful functionalities for biosensors and neuroinspired electronics, with still much to understand on the time dependent behavior of this electrochemical device. Here, we report on distributed element modeling of the impedance of such microfabricated device, systematically performed under a large concentration variation for KCl(aq) and CaCl2(aq). We propose a new model which takes into account three main deviations to ideality, that were systematically observed, caused by both the materials and the device complexity, over large frequency range (1 Hz to 1 MHz). More than introducing more freedom degree, the introduction of these non redundant parameters and the study of their behaviors as function of the electrolyte concentration and applied voltage give a more detailed picture of the OECT working principles. This optimized model can be further useful for improving OECT performances in many applications (e.g. biosensors, neuroinspired devices) and circuit simulations.Comment: Full paper with supporting informatio

Postoji li dodatna skala u frakcionalnom kvantnom Hallovom efektu?

We reanalyse theoretical considerations and experimental data, in an attempt to decide whether there is another scale in the fractional quantum Hall effect problem, in addition to the magnetic scale defined by the magnetic length ac or the cyclotron energy(h/2p)wc. We then discuss possible implications of a new scale on the formulation of a theoretical model of the fractional quantum Hall effect.U nastojanju da se utvrdi postoji li u frakcionalnom kvantnom Hallovom efektu dodatna skala, pored magnetske skale određene magnetskom dužinom ac ili ciklotronskom energijom ¯hωc, preispitani su neki postojeći teorijski rezultati i eksperimentalni podaci. Zatim se razmatraju moguće posljedice nove skale na formuliranje teorijskog modela frakcionalnog kvantnog Hallovog efekta

Retailer pricing strategies on the business example

U diplomskom radu obrađene su cjenovne strategije kojima se maloprodavači koriste prilikom određivanja cijena maloprodajne robe. Kroz temeljne odrednice maloprodajnih cijena definiraju se koncepti i metode formiranja cijena te kakve su razine maloprodajnih cijena u Hrvatskoj. Metode određivanja cijena i cjenovnih strategija predstavljaju ključan zadatak za efikasno poslovanje prodavaonice, no prilikom njihovog određivanja menadžment mora odabrati odgovarajuću strategiju koja će privući kupce i ostvariti pozitivan poslovni rezultat. Prikupljeni rezultati analize poslovanja na poslovnom primjeru daju odgovore koji svjedoče činjenici da su cijene predmet konkurentske prednosti u rastućoj tržišoj konkurenciji. Ipak, kroz poslovan primjer evidentno je kako prodavaonice s pogrešnom tržišnom nišom, niskom razinom opremljenosti te nedovoljnim ulaganjem u marketinške promocije ne mogu konkurirati na tržištu.This thesis defines pricing strategies that retailers use while setting prices of the retail goods. The basic determinants of the retail prices define main pricing concepts and methods but also price level in the Republic of Croatia. Pricing methods and pricing strategies are the key for the efficient store dealings so management need to choose the right strategy that will attract customers and make positive business results. Case study results testify the fact that prices are competitive strenght in the increasing market competition. However, case sudy shows that the reatil stores with the wrong market niche, low equipment level and insufficient marketing investment cannot compete in the market

Retailer pricing strategies on the business example

U diplomskom radu obrađene su cjenovne strategije kojima se maloprodavači koriste prilikom određivanja cijena maloprodajne robe. Kroz temeljne odrednice maloprodajnih cijena definiraju se koncepti i metode formiranja cijena te kakve su razine maloprodajnih cijena u Hrvatskoj. Metode određivanja cijena i cjenovnih strategija predstavljaju ključan zadatak za efikasno poslovanje prodavaonice, no prilikom njihovog određivanja menadžment mora odabrati odgovarajuću strategiju koja će privući kupce i ostvariti pozitivan poslovni rezultat. Prikupljeni rezultati analize poslovanja na poslovnom primjeru daju odgovore koji svjedoče činjenici da su cijene predmet konkurentske prednosti u rastućoj tržišoj konkurenciji. Ipak, kroz poslovan primjer evidentno je kako prodavaonice s pogrešnom tržišnom nišom, niskom razinom opremljenosti te nedovoljnim ulaganjem u marketinške promocije ne mogu konkurirati na tržištu.This thesis defines pricing strategies that retailers use while setting prices of the retail goods. The basic determinants of the retail prices define main pricing concepts and methods but also price level in the Republic of Croatia. Pricing methods and pricing strategies are the key for the efficient store dealings so management need to choose the right strategy that will attract customers and make positive business results. Case study results testify the fact that prices are competitive strenght in the increasing market competition. However, case sudy shows that the reatil stores with the wrong market niche, low equipment level and insufficient marketing investment cannot compete in the market