Design and realization of electronic modules

Táto práca sa zaoberá prepojovaním elektronických a mikroelektronických modulov s doskou plošného spoja (DPS). Prvá časť obsahuje definíciu modulu, termomechanického namáhania, rozbor základných materiálov, popis prepojenia pomocou spájkovacích guličiek, pinov, hrany DPS, a novú metódu prepojenia modulov s využitím čipových súčiastok. V praktickej časti je návrh modulu inteligentného spínača a detektoru farby. Modul detektoru farby je prepojený so základnou doskou pomocou hrany DPS, pinov a osadením do pätice PLCC 68.This thesis discusses interconnection electronic and microelectronic modules with Printed Board Circuit(PCB). The first part contains of definition of module, thermomechanical stress, analysis of bacic materials, characterization of interconnection using solder balls, pins, edge PCB, and new method for interconnection using chip component. The practical part is to design an intelligent controller module and color detector. Color detector module is connected to the motherboard using the edge PCB pins and shoulder into the socket PLCC 68.

Estimating Human Movement Using Accelerometers

Tato práce je zaměřena na analýzu lidského pohybu, zejména měření úhlu kolena, co je důležité především při procesu rehabilitace u pacientů s protézy kolenního kloubu nebo po operaci. Pro měření IMU - inerciální měřící jednotky od firmy Xsens jsou použité, přičemž pouze data z 3-osého akcelerometru a gyroskopu jsou zahrnuty. Vhodné umístění jednotek je vybráno, jakož i metody pro kalibraci a následný výpočet úhlu ze zaznamenaných dat. Tyhle metody jsou implementovány a experimentálně ověřeny. Experimenty ukazují, že výsledky jsou docela přesné, a toto řešení je použitelné při analýze pacientů například provedením monitorování chůze.This work is aimed at analysis of human movement, especially measurement of knee angle, which is important data for monitoring in process of rehabilitation on patients with knee arthroplasty or after surgery. For measurement IMUs - Inertial Measurement Units from Xsens are used, while only data from 3-axis accelerometer and gyroscope are gathered. Appropriate unit position is chosen, as well as methods for calibration and angle calculation from stored measured data. These methods are implemented and experimentally validated. Experiments shows, that results are pretty accurate and this solution is useful in analysis of patients for example by doing gait analysis.

Bessel beams of two-level atoms driven by a linearly polarized laser field

We study Bessel beams of two-level atoms that are driven by a linearly polarized laser field. Starting from the Schroedinger equation, we determine the states of two-level atoms in a plane-wave field respecting propagation directions both of the atom and the field. For such laser-driven two-level atoms, we construct Bessel beams beyond the typical paraxial approximation. We show that the probability density of these atomic beams obtains a non-trivial, Bessel-squared-type behavior and can be tuned under the special choice of the atom and laser parameters, such as the nuclear charge, atom velocity, laser frequency, and propagation geometry of the atom and laser beams. Moreover, we spatially and temporally characterize the beam of hydrogen and selected (neutral) alkali-metal atoms that carry non-zero orbital angular momentum (OAM). The proposed spatiotemporal Bessel states (i) are able to describe, in principle, twisted states of any two-level system which is driven by the radiation field and (ii) have potential applications in atomic, nuclear processes and quantum communication.Comment: 13 pages, 5 figures, appeared as a EPJD highlight on Thursday, 01 August 2013 http://www.epj.org/index.php?option=com_content&view=article&id=684%3Aepjd-highlight-novel-beams-made-of-twisted-atoms&catid=112%3Aepj-d&Itemid=466&lang=e

Atomic ionization by twisted photons: Angular distribution of emitted electrons

We investigate the angular distribution of electrons that are emitted in the ionization of hydrogen-like ions by twisted photons. Analysis is performed based on the first-order perturbation theory and the non-relativistic Schr\"odinger equation. Special attention is paid to the dependence of the electron emission pattern on the impact parameter b of the ion with respect to the centre of the twisted wave front. In order to explore such a dependence, detailed calculations were carried out for the photoionization of the 1s ground and 2 py excited states of neutral hydrogen atoms. Based on these calculations, we argue that for relatively small impact parameters the electron angular distributions may be strongly affected by altering the position of the atom within the wave front. In contrast, if the atom is placed far from the front centre, the emission pattern of the electrons is independent on the impact parameter b and resembles that observed in the photoionization by plane wave photons.Comment: 23 pages, 6 figure

Inclined belt conveyor for foundry sand

Bakalářská práce se zabývá návrhem pásového dopravníku pro přepravu slévárenského písku o výkonu 90 000 kg.h-1, s osovou vzdáleností přesypů 30 m a výškovým rozdílem 5,8 m. Práce zahrnuje popis jednotlivých částí, funkční výpočet dopravníku, návrh pohonu, napínacího zařízení a rámu dopravníku a pevnostní kontrolu napínacího zařízení. K práci je přiložena výkresová dokumentace dle zadání.The bachelor´s thesis deals with a draft of belt conveyor for foundry sand with transport capacity 90 000 kg.h-1 , axial distance dunes 30 m and height difference 5,8 m. Thesis includes description of particular parts, functional calculation, draft of a conveyor drive, tensioning device and conveyor frame and strength control of a tensioning device. Drawing documentation according to assignment is enclosed.

Basic digit sets for radix representation

computing reviews categories: 5.30, 6.1, 5.11, 3.15The use of a negative base did not appear until the 1950s when several authors independently introduced the concept. Complement representation also became much discussed in this period as an alternative to sign magnitude for designing the arithmetic unit of a computer. The arithmetic of numbers represented in positional notation has a firm foundation derived from the theory of polynomial arithmetic that readily allows these extensions to negative bases and/or negative digit values, complement representation, and digit values in excess of the base. Our primary concern in this paper is the characterization and computation of those integral valued base and digit set pairs that provide complete and unique finite radix representation of the integersNAsupported in part by the National Science Foundation under Grant GJ-36658 and by the Deutsche Forschungsgemeinschaft under Grant KU 155/5.http://archive.org/details/basicdigitsetsfo00mat

Further Reducing the Redundancy of a Notation over a Minimally Redundant Digit Set

International audienceRedundant notations are used implicitly or explicitly in many digital designs. They have been studied in details and a general framework is known to reduce the redundancy of a notation down to the minimally redundant digit set. We present here an operator to further reduce the redundancy of such a representation. It does not reduce the number of allowed digits since removing one digit to a minimally redundant digit set is a conversion to a non redundant digit set and this is an expensive operation. Our operator introduces some correlation between the digits to reduce the number of possible redundant notations for any represented number. This reduction is visible in small useful operators like the elimination of leading zeros. We also present a key application with a CMOS Booth recoded multiplier. Our multiplier is able to accept both a redundant or a non redundant input with very little modifications and almost no penalty in time or space compared to state-of-the-art non redundant multipliers