Usmena književnost u povijestima hrvatske književnosti

Oral literature exists as long as humankind. Through history, that kind of literature was known as folk, anonymous, folklore, traditional, peasant (during the reign of Croatian Peasant Party). Oral literature is the tradition of written literature. In the past, oral literature was often given more attention than the written, and sometimes it was neglected. A great interest in folk literature emerged in the Renaissance period. Michel de Montaigne was enthusiastic about folk poetry and since his time term folk literature has been in use. The oral literature has reached its peak of popularity during the Romanticism. Approach to the oral literature in Croatian histories of literature is fourfold. Some literary historians barely mention it in their histories. Others speak of it peripherally when dealing with, for example, Petar Hektorović, Ivan Gundulić, Andrija Kačić Miošić, and many others. Some literary historians write about both oral (folk) and written literature in their histories of literature. The final approach is by those authors who have written histories of oral (folk) literature. Some literary historians have written histories of oral literature. Maja Bošković-Stulli in collaboration with Divna Zečević dedicated the first book of 1978 edition Povijest hrvatske književnosti: u sedam knjiga to the oral literature. In that history, the authors wrote about folk literature alongside the oral. In 1990 Tvrtko Čubelić published a monograph Povijest i historija usmene narodne književnosti. Marko Dragić published Poetika i povijest hrvatske usmene književnosti in 2008 and Stipe Botica published Povijest hrvatske usmene književnosti in 2013.

Approximation Formula for Option Prices under Rough Heston Model and Short-Time Implied Volatility Behavior

Rough Heston model possesses some stylized facts that can be used to describe the stock market, i.e., markets are highly endogenous, no statistical arbitrage mechanism, liquidity asymmetry for buy and sell order, and the presence of metaorders. This paper presents an efficient alternative to compute option prices under the rough Heston model. Through the decomposition formula of the option price under the rough Heston model, we manage to obtain an approximation formula for option prices that is simpler to compute and requires less computational effort than the Fourier inversion method. In addition, we establish finite error bounds of approximation formula of option prices under the rough Heston model for 0.1≤H<0.5 under a simple assumption. Then, the second part of the work focuses on the short-time implied volatility behavior where we use a second-order approximation on the implied volatility to match the terms of Taylor expansion of call option prices. One of the key results that we manage to obtain is that the second-order approximation for implied volatility (derived by matching coefficients of the Taylor expansion) possesses explosive behavior for the short-time term structure of at-the-money implied volatility skew, which is also present in the short-time option prices under rough Heston dynamics. Numerical experiments were conducted to verify the effectiveness of the approximation formula of option prices and the formulas for the short-time term structure of at-the-money implied volatility skew.

Petrifying Earth Process: The Stratigraphic Imprint of Key Earth System Parameters in the Anthropocene

The Anthropocene concept arose within the Earth System science (ESS) community, albeit explicitly as a geological (stratigraphical) time term. Its current analysis by the stratigraphical community, as a potential formal addition to the Geological Time Scale, necessitates comparison of the methodologies and patterns of enquiry of these two communities. One means of comparison is to consider some of the most widely used results of the ESS, the ‘planetary boundaries’ concept of Rockström and colleagues, and the ‘Great Acceleration’ graphs of Steffen and colleagues, in terms of their stratigraphical expression. This expression varies from virtually non-existent (stratospheric ozone depletion) to pronounced and many-faceted (primary energy use), while in some cases stratigraphical proxies may help constrain anthropogenic process (atmospheric aerosol loading). The Anthropocene concepts of the ESS and stratigraphy emerge as complementary, and effective stratigraphic definition should facilitate wider transdisciplinary communication.

Numerical study on aerodynamic heat of hypersonic flight

Accurate prediction of the shock wave has a significant effect on the development of space transportation vehicle or exploration missions. Taking Lobb sphere as the example, the aerodynamic heat of hypersonic flight in different Mach numbers is simulated by the finite volume method. Chemical reactions and non-equilibrium heat are taken into account in this paper, where convective flux of the space term adopts the Roe format, and discretization of the time term is achieved by backward Euler algorithm. The numerical results reveal that thick mesh can lead to accurate prediction, and the thickness of the shock wave decreases as grid number increases. Furthermore, most of kinetic energy converts into internal energy crossing the shock wave.

A Penalty Optimization Algorithm for Eigenmode Optimization Problem Using Sensitivity Analysis

This paper investigates the eigenmode optimization problem governed by the scalar Helmholtz equation in continuum system in which the computed eigenmode approaches the prescribed eigenmode in the whole domain. The first variation for the eigenmode optimization problem is evaluated by the quadratic penalty method, the adjoint variable method, and the formula based on sensitivity analysis. A penalty optimization algorithm is proposed, in which the density evolution is accomplished by introducing an artificial time term and solving an additional ordinary differential equation. The validity of the presented algorithm is confirmed by numerical results of the first and second eigenmode optimizations in 1Dand 2Dproblems.