Příspěvky z konference

Nejnovější přírůstky:
2018-04-18
16:23
Dokumentace, publikace a interpretace detektorových nálezů na příkladu spon typu Jobst 4F
Komoróczy, Balázs ; Vlach, Marek ; Zelíková, Michaela
Spony představují skupinu nálezů, které byly v průběhu posledních 25 let často předmětem intenzivního zájmu detektorové prospekce. V České republice je v současnosti počet amatérů provozujících tuto aktivitu podstatně větší než profesionálních archeologů. Archeologie jakožto věda nemůže rezignovat na poznatky, které pocházejí z nálezů učiněných detektoráři, bez ohledu na osobní názory. Považujeme proto dokumentaci všech archeologických nálezů v naší zemi za profesní povinnost archeologických institucí, která není zpochybnitelná žádnými smysluplnými argumenty. Naopak, pokud samotní detektoráři či široká veřejnost znemožní archeologům dokumentaci těchto nálezů, způsobují tím postupný proces postupného „oslepnutí“ archeologie.

Úplný záznam
2018-04-18
16:23
Archaeological textile research in the Czech Republic
Bravermanová, M. ; Březinová, Helena
The paper is a synoptical summary of scientific research focused on research of archaeological textiles in the Czech Republic. It maps the development of this discipline from the 19th century to present, lists the most important experts involved in the research of the historical development of textile production and its archaeological evidence.

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2018-04-06
16:29
Thermal induced morphological changes of poly(ethylene oxide) nanofibrous webs
Polášková, M. ; Peer, Petra ; Ponížil, P. ; Čermák, R.
The crystallinity of fibres prepared by electrospinning shows lower level in comparison with samples processed by common technologies such as moulding or film casting. Thus, the attempts to improve the structure of electrospun fibres in order to increase physical and mechanical properties of nonwoven webs are obvious. Post-process thermal treatment is one of the possibilities of the crystallinity enhancement that can be easily included to the finishing operation of final products. For the experiment we used poly(ethylene oxide) representing electrospun-friendly material and two solvents - methanol and water, both ensuring good electrospinnability. It is demonstrated that a choice of polymer solvents plays a significant role in fibre diameter and their capabilities to resist applied heat. However, in all cases the enhancement of crystallinity is detected at the short time of thermal exposure.

Úplný záznam
2018-04-06
16:29
Nanomechanical testing of an a-C:N nanolayer prepared by ion beam assisted deposition on Ti.sub.6./sub.Al.sub.4./sub.V alloy
Vlčák, P. ; Šepitka, J. ; Horaždovský, T. ; Jirka, Ivan ; Gregora, Ivan ; Němec, M.
We applied ion beam assisted deposition for preparing a-C:N nanolayers on Ti6Al4V alloy. A Hysitron TI 950 TriboIndenter (TM) nanomechanical test instrument was used to assess the depth profiles of the mechanical properties on modified titanium substrates. Two methods were employed : a) quasistatic partial unload, and b) dynamic Continuous Measurement of X (CMX). The average nanoindentation hardness increased from HIT similar to 5GPa for a reference sample to HIT similar to 8.6 GPa for a sample coated by an a-C nanolayer, and to HIT similar to 11.5 GPa for a sample coated by an a-C:N nanolayer. The average storage modulus of the sample coated by a-C:N increased from E' similar to 130 GPa (reference sample) to E' similar to 155 GPa. The storage modulus of the sample coated by the a-C nanolayer was less than the storage modulus of the titanium substrate.

Úplný záznam
2018-04-06
16:29
The role of solvents in the preparation of hydrophobic nanofibrous membrane containing fumed silica
Peer, Petra ; Polášková, M. ; Musilová, I. ; Filip, Petr
It is well-known that a type of used fumed silica nanoparticles plays a dominant role in wettability of the corresponding nanofibrous mats. As a result, the desired contact angle can be approximately achieved by a choice of adequate fumed silica nanoparticles. However, less attention has been hitherto paid to an active role of solvents in connection with the tailoring this contact angle. For analysis we used poly(vinyl butyral) representing electrospun-friendly material, various types of fumed silica nanoparticles and two solvents - methanol and ethanol. It is demonstrated that a choice of polymer solvents plays a significant role in contact angle changes. Hence, in combination of the type of fumed silica nanoparticles and the type of solvent it is possible to achieve a finer partition of the required contact angles.

Úplný záznam
2018-03-26
17:54
Current possibilities for quantification and modeling of recreation services
Pechanec, V. ; Cudlín, Pavel ; Machar, I. ; Kilianová, H.
Ecosystems provide settings for a hugely diverse array of recreational activities. Recreational values are among the most well-recognized of all ecosystem services by the public, and human preferences for recreation have been well-studied by economists and other social scientists. From a spatial perspective, we can map sources of recreational value, sinks of recreational value, users of a particular recreation area for a given activity, and the spatial flow that connects users to specific recreational areas. The text presents two key approaches of modelling tools InVEST and ARIES. Methodological approaches are compared with each other and the requirements for data confronted with national data sources.

Úplný záznam
2018-03-26
17:54
Asymmetry of the response probability density of a system with parametric random noises
Náprstek, Jiří ; Fischer, Cyril
Recording of time variable processes is accompanied by various internal disturbing effects as a rule. They influence parameters of the measuring facility, transducer-device transmission, etc. These parasitic processes are usually of the random character and, consequently, they exercise as parametric noises. Moreover, the input signal mostly consists of a useful signal which can be taken as composed from deterministic and random additive part. Various combinations of these noises are the origin of random and also systematic measuring errors which can have under certain circumstances a cumulative character, deteriorate the output signal quality and can lead finally to the stochastic stability loss. These effects can be theoretically described using differential systems with stochastic coefficients and stochastic right hand side considering all input and output processes to be of the Markov type.

Úplný záznam
2018-03-26
17:54

Úplný záznam
2018-03-26
17:54
Living on the Edge: Integration vs. Modularity in the Phonology of Czech Anglicisms
Duběda, Tomáš
The article discusses different aspects of the phonology of Czech Anglicisms, categorizing the adaptation mechanisms into “integrative” and “modular.” The integrative mechanisms include the Phonological Approximation Principle, the Spelling Pronunciation Principle, and different types of analogies. The modular mechanisms, which increase the autonomy of the subsystem of Anglicisms, include the Original Pronunciation Principle, the presence of marked phonemes or phonotactic structures, phonological variability resulting from the competition between adaptation principles, irregular mapping between phonology and spelling, as well as underlying links to English phonology. Quantitative evidence is provided for some of these tendencies, and several psycholinguistic hypotheses are formulated in connection with the adaptation model.

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2018-03-26
17:54

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