Modified Josephson Relation

For type II superconductors, Josephson has shown that vortices moving with velocity v_L create an effective electric field E'=-v_L x B. By definition the effective electric field is gradient of the electrochemical potential, what is the quantity corresponding to voltage observed with the use of Ohmic contacts. It relates to the true electric field E via the local chemical potential mu as E'=E - grad(mu)/e. We argue that at low temperatures the true electric field in the bulk can be approximated by a modified Josephson relation E=(v_s-v_L) x B, where v_S is the condensate velocity.Comment: 3 page

Vortex induced deformation of the superconductor crystal lattice

Deformation of the superconductor crystal lattice caused by Abrikosov vortices is formulated as a response of the elastic crystal lattice to electrostatic forces. It is shown that the lattice compression is linearly proportional to the electrostatic potential known as the Bernoulli potential. Eventual consequences of the crystal lattice deformation on the effective vortex mass are discussed.Comment: 4 pages 5 figure

Analysis of a plan curved cable stayed and suspension footbridges

Dizertační práce je zaměřena na statickou a dynamickou analýzu půdorysně zakřivených zavěšených a visutých lávek pro pěší, které jsou zavěšeny pouze na vnitřní straně mostovky. První část práce se zabývá analýzou rovnováhy mostovky v příčném směru při jednostranném zavěšení příčného řezu. Cílem je navrhnout průřez a jeho uspořádání tak, aby mostovka nebyla od zatížení vlastní tíhou a stálým zatížením namáhána kroutícím momentem. Pro ověření podmínek rovnováhy v příčném směru s vlivem a bez vlivu předpětí byla vypracována jednoduchá studie. Další část práce se věnuje vytvoření studie půdorysně zakřivené zavěšené lávky pro pěší. Ve studii bylo detailně popsáno nalezení výchozího stavu konstrukce a provedla se základní statická a dynamická analýza za použití dostupného software. Úkolem statické analýzy bylo popsat odezvu konstrukce na nejčastěji působící zatížení, nikoliv však návrh a dimenzování v souladu s platnými normami. Dynamická analýza umožnila ověřit náchylnost konstrukce k vibracím a jiným škodlivým účinkům vynuceného kmitání, které nabývají na významu u lávek pro pěší díky jejich štíhlosti. Dalším cílem práce bylo vypracování studie zakřivené visuté konstrukce zavěšené pouze na vnitřním okraji. Ucelený postup analýzy těchto konstrukcí nebyl obsažen v žádné dostupné literatuře. Zejména nalezení výchozího stavu visutého lana není nikde a nikým zdokumentováno. Studie byla analyzována se stejnou geometrií jako u předchozí zavěšené varianty, aby bylo možné tyto druhy konstrukcí porovnat. Nakonec se provedla statická a dynamická analýza. V poslední části práce se ověřilo na plně funkčním fyzikální modelu v měřítku 1:10 konstrukční řešení, navržený postup hledání výchozího stavu konstrukce, odezva konstrukce na statické zatížení a zjistila se mezní únosnost konstrukce. Důležitým krokem bylo vyhodnocení a srovnání výsledků z provedeného fyzikálního modelu proti výpočtovému matematickému modelu z pohledu výchozího stavu, statické a mezní zatěžovací zkoušky.The aim of the doctoral thesis focuses on the static and dynamic analysis of a plan curved cable stayed and suspension pedestrian bridges suspended on a single-side of their deck. The first part of this thesis deals with an analysis of the equilibrium in the transversal direction of a deck cross section suspended on a single-side. The section and its arrangement should be designed so that the torsion caused by the deck self-weight and dead load would be minimal. This theory was verified on a simple study of a single-sided suspended section with and without prestressing. Second part of the thesis deals with the design of a study of a plan curved cable stayed pedestrian bridge. The study describes in detail a finding of an initial state of the structure and the static and dynamic analysis performed by software ANSYS. The static analysis describes the response of the structure on the most frequent variable loads only, but not design of dimensioning according to the valid codes. The dynamic analysis verifies a predisposition of the structure to the vibrations and others harmful oscillation effects. The next objective of the thesis was to design a study of a plan curved suspension pedestrian bridge suspended on a single-side. A process of an analysis of these structures has not found in any available references. Especially, the finding of an initial state of a suspension cable has not been documented anywhere and by anybody. The study was analyzed with the same geometry as the cable stayed variation in order to compare both structures. The static and dynamic analysis was performed, too. The last part of the thesis describes the verification of structural solution on a fully functional model in a 1:10 scale, proposed process of the initial state finding, response of the structures on the loading and ultimate load test. The important step is the comparison of the results of the completed physical model and the calculation model.

Phase change material based accumulation panels in combination with renewable energy sources and thermoelectric cooling

The article deals with the use of modern materials and technologies that can improve the thermal comfort in buildings. The article describes the design and usage of a special accumulation device, which is composed of thermal panels based on phase change materials (PCMs). The thermal panels have an integrated tube heat exchanger and heating foils. The technology can be used as a passive or active system for heating and cooling. It is designed as a "green technology", so it is able to use renewable energy sources, e.g., photovoltaic (PV) panels, solar thermal collectors and heat pumps. Moreover, an interesting possibility is the ability to use thermoelectric coolers. In the research, measurements of the different operating modes were made, and the results are presented in the text. The measurement approves that the technology improves the thermal capacity of the building, and it is possible to use it for active heating and cooling. © 2017 by the authors; licensee MDPI.CZ.1.05/2.1.00/03.0089, ERDF, European Regional Development Fund; MŠMT, Ministerstvo Školství, Mládeže a Tělovýchovy; IGA/CEBIA-Tech/2016/001, UTB, Univerzita Tomáše Bati ve ZlíněMinistry of Education, Youth and Sports of the Czech Republic [LO1303 (MSMT-7778/2014)]; European Regional Development Fund under the project CEBIA-Tech [CZ.1.05/2.1.00/03.0089]; Tomas Bata University in Zlin [IGA/CEBIA-Tech/2016/001

Thermal energy storage in the form of heat or cold with using of the PCM-based accumulation panels

This article describes the usage of thermal energy storage in the form of heat and cold with an adaptation of the special device which is composed of the thermal panels. These panels are based on the phase change materials (PCM) for normal inner environment temperature in buildings. The energy for the thermal energy storage is possible to get from built-in electric heating foil or from the tube heat exchanger, which is build in the thermal panels. This technology is able to use renewable energy sources, for example, solar thermal collectors and air-to-water heat pump as a source of heat for heating of the hot water tank. In the cooling mode, there is able to use the heat pump or photovoltaics panels in combination with thermoelectric coolers for cooling.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [L01303, MSMT-7778/2014]; European Regional Development Fund [CZ.1.05/2.1.00/03.0089]; internal grant agency of Tomas Bata University in Zlin [IGA/CEBIATech/2016/001

Bayesian Geographical Profiling in Terrorism Revealing

A significant part of research in terrorism studies focuses on the analysis of terrorist groups. An important issue for this type of research is that a large number of attacks are not attributed to a specific group. As an appropriate approach to solve the problem of attributing group responsibility we applied the geographic profiling theory. We analyzed several terrorist organizations which typically commit attacks far away from their headquarters. We proposed an innovative method based on Bayesian approach to find the organization’s base and to attribute responsibility to perpetrators of terrorist attacks. We compared the results with classical techniques used in criminology. The real data analysis shows rationale for the proposed approach. Analyzed data comes from the Global Terrorism Database which is currently the most extensive database on terrorism ever collected

Boundary condition for Ginzburg-Landau theory of superconducting layers

Electrostatic charging changes the critical temperature of superconducting thin layers. To understand the basic mechanism, it is possible to use the Ginzburg-Landau theory with the boundary condition derived by de Gennes from the BCS theory. Here we show that a similar boundary condition can be obtained from the principle of minimum free energy. We compare the two boundary conditions and use the Budd-Vannimenus theorem as a test of approximations.Comment: 6 pages, 4 figure

Shifts of the nuclear resonance in the vortex lattice in YBa2_2Cu3_3O7_7

The NMR and NQR spectra of $^{63}$Cu in the CuO$_2$ plane of YBa$_2$Cu$_3$O$_7$ in the superconducting state are discussed in terms of the phenomenological theory of Ginzburg-Landau type extended to lower temperatures. We show that the observed spectra, Kumagai {\em et al.}, PRB {\bf 63}, 144502 (2001), can be explained by a standard theory of the Bernoulli potential with the charge transfer between CuO$_2$ planes and CuO chains assumed.Comment: 11 pages 7 figure

The concept of correlated density and its application

The correlated density appears in many physical systems ranging from dense interacting gases up to Fermi liquids which develop a coherent state at low temperatures, the superconductivity. One consequence of the correlated density is the Bernoulli potential in superconductors which compensates forces from dielectric currents. This Bernoulli potential allows to access material parameters. Though within the surface potential these contributions are largely canceled, the bulk measurements with NMR can access this potential. Recent experiments are explained and new ones suggested. The underlying quantum statistical theory in nonequilibrium is the nonlocal kinetic theory developed earlier.Comment: 14 pages, CMT30 proceeding