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DOT.COM BUBBLE, CAUSES, CONSEQUENCES, PRESENT
Cakl, Martin ; Titze, Miroslav (advisor) ; Pfeifer, Lukáš (referee)
Topic of this thesis is crisis which has developed in year 2000. Thesis is divided into two main fractions and then into multiple sub chapters. First part is focused on theoretical basis on which thesis later develops. Second part analyzes causes and implications dot.com crisis had and finally uses the same analysis for current situation at internet market segment. Thesis argues that main causes of the bubble were analytics, speculation, monetary policy and overall positive environment towards investing into internet companies. Furthermore thesis implies, that there might be another bubble arising as internet companies, especially so called social media companies, have highly overvalued stock prices and thus might cause downfall upon eventual correction.
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Financial frictions, bubbles, and macroprudential policies
Derviz, Alexis
Writer explores the ability of a macroprudential policy instrument to dampen the consequences of equity mispricing (a bubble) and the correction thereof (the bubble bursting), as well as the consequences for real activity in a production economy. In the model, producers are financed by both bank debt and equity, and face a mix of systemic and idiosyncratic uncertainty.
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Measurement of the impulsive force generated by colapsing bubble close to a solid boundary
Müller, M. ; Unger, J. ; Holata, J. ; Zima, Patrik
The article presents experimental results of the acoustical and optical study of cavitation bubble collapse close to a solid boundary in water. The bubble was generated by discharge of low-voltage capacitor into a couple of wires closing a simple circuit. Different distances from the solid wall and different maximum bubble radii were studied. The bubble radius was studied using time-resolved photography and by PVDF film sensor glued on the solid boundary. The illumination was provided by high-power led diode. Synchronization of the system was provided by pulse generator connected to an oscilloscope. The impact power of the bubble to the wall was estimated from the time-resolved photography of the bubble and from the PVDF film sensor signal. The PVDF film sensor calibration was performed by a pendulum test to estimate the impact force.
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Oscillation of Interfacial Meniscus during the Formation of Bubbles
Stanovský, Petr ; Růžička, Marek
A closer look at the interphase meniscus in the model system with a transparent plate using a high-speed camera has showed that after detachment of the bubble the meniscus moves to the lower orifice rim. On that rim the meniscus oscillate dumped by increasing pressure in the space below the plate. In the description of the bubble growth at the orifice during so called waiting period accrue the equations describing the oscillatory behavior of the meniscus. Together with the nonlinear Rayleigh-Plesset equation it results in a bifurcation behavior - the volume of bubbles differ by up to 50% from the mean at certain values of the gas flow. This phenomenon has not been previously identified as the time-averaged values of bubble sizes conceal this effect.
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Kavitační bublina v blízkosti pevné stěny
Müller, M. ; Zima, Patrik
The article presents the results of the calculation of the cavitation bubble collapse near a solid boundary. The solution is obtained using the FLUENT CFD software. The VOF (Volume Of Fluid) model is applied to study the behavior of the interphase between the liquid and the bubble content. The calculations were performed for three different distances of the bubble from the solid wall. The evolution of the bubble radius is obtained from the phase interface contours. The bubble jet velocity and its thickness are determined for all bubble positions.
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Experimentální výzkum kavitační bubliny ve vodě
Müller, M. ; Zima, Patrik
The article presents the results of experimental investigation of laser-induced cavitation bubble in water. The cavitation bubble is generated using the Q-switched Nd-YAG laser and recorded by a multi-exposure method, which allows to record the bubble at different phases into single frame.
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Bubble Production Controlled by Needle Movement
Vejražka, Jiří ; Stanovský, Petr ; Zedníková, Mária
For the research of multiphase flows, it is often needed to produce bubbles of well-defined size. Examples of such a research are studies of bubble acoustic emission, bubble interactions with solid particles (e.g. in flotation process) or interactions between bubbles. To produce a well-defined bubble is, however, rather difficult, and it is even more difficult to vary the bubble size between different experimental runs. For this reason, we have produces an instrument ("bubble generator", which produces bubbles in a controlled manner, enableng to set indepedently the bubble size, bubbling frequency and total number of bubbles. The bubbling control is achieved by moving the needle, on which the bubbles are produced.
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Stock Price Bubbles
Li, Xiaokun ; Musílek, Petr (advisor) ; Veselý, Marek (referee)
Economic bubbles are playing an increasingly significant role in the current global economy. We believe these bubbles are to a certain extent dominating the real economy, and, therefore, research based on this specific economic phenomenon is becoming increasingly popular and important. The focus of this master's thesis is based upon analysis of stock price bubbles. This thesis contains author analyzed historical cases representative of stock price bubbles; summarizations of their traditional features; common factors causing their formation; and reasons leading to their bursting. Solutions to the dilemma of stock price bubbles are discussed in depth, and emphasis is placed upon clearly deciphering different theoretical approaches regarding this phenomenon-not only from the efficient market hypothesis viewpoint but also from the perspective of behavioral finance. The research contains testing and measuring methodologies of stock price bubbles, and the author's view concerning them is strongly supported by the results within the empirical data-testing chapter. Upon reading, one can expect to achieve a basic overview of this forefront science.
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