Wireless safety appliance

Cílem práce je zabezpečit objekt např. kolo, kočárek, zboží. Zabezpečovací zařízení se skládá ze senzorové a uživatelské jednotky, pageru. Obě jednotky jsou osazeny tranceiverem, který pracuje v ISM pásmu, a neustále mezi sebou komunikují kvůli kontrole dosahu. Řízení obvodů zajišťuje mikroprocesor AVR s nízkou spotřebou kvůli možnosti napájení z baterií. Senzorová jednotka je připojena na hlídaný objekt, monitoruje stav senzorů a vybití baterie. Jako senzory jsou použity akcelerometr a dva obyčejné kontaktní senzory. Osobní jednotka indikuje alarm opticky i akusticky, dále také stav baterií obou jednotek a upozorňuje na ztrátu spojení.The purpose of this project is to secure an object, for example bicycle, buggy,merchandise. Protecting device consists of a sensor unit and a pager unit. Both of these units contain a transceiver which works in ISM band. Operation circuits drive microprocessor AVR with low power technology because of possible battery supply. Sensor unit is monitoring the state of sensors and battery discharging. This unit can use accelerometer sensor and two contact sensors. The pager unit indicates alarm, the state of battery in both units and signalizes loss of connection.

Numerical Simulation of Joining Ropes by Sewing Stitches

Braided structures are widely used in numerous contexts including everyday practice. In most cases, rope ends are knotted to form various types of loops or tie them to rigid body parts; however, knots take up space that may not be available in some application scenarios, thus making them unsuitable for certain purposes. Hence, this paper introduces first development steps of a method for the numerical simulation of rope ends connected by sewing stitches

Numerical and experimental results from measuring spinal implant stability

Nowadays, there are many diagnostic methods in medicine. A negative effect in implantology has been recognized since the 1980s. In general terms, if an implant is introduced into the body, it is sometimes not accepted by the organism. This effect is usually referred to as low level of implant stability. There are many reasons why such an effect takes place. This paper is focused on the mechanical point of view. There is a relation between mechanical movement of an implant and success of the surgery [1, 2]. Cervical implant was chosen for our research because there is no information about the stability thereof. Such knowledge can benefit surgeons. A device based on measuring response function was designed. This device is connected to an implant. The implant and its surrounding bone are the boundary conditions. It was expected that these boundary conditions can affect frequency response function in a connected structure. A beam with exactly defined mechanical properties was designed for cervical implant. A vibration head was attached to one end of the beam. The vibration head produces transversal vibration. An accelerometer to measure the response was attached to the other end. The vibration head utilizes a piezo actuator and inertia force. This device was tested in vitro on a cervical cadaver in a laboratory. Mechanical stability of the implant was simulated with axial force. The results were obtained in a frequency domain by Fourier transform. The focus is on resonance frequencies and resonance amplitudes. They show that there is a correlation between implant stability and response function evaluation. Further, a numerical model of the device designed was made. The model was built using the finite element method. Finally, the experimental and numerical models were compared

Wireless sensoric network for hop drying facility

Cílem práce je vytvořit bezdrátovou senzorickou síť pro měření teploty a relativní vlhkosti pro sušárnu chmele. Zařízení slouží k monitorování těchto veličin, skládá se z několika senzorových jednotek a jedné zobrazovací. Všechny jednotky jsou napájeny z baterií, je tedy nutné zajistit energetickou nenáročnost celé sítě. Zobrazovací jednotka koordinuje celou síť a umožňuje zobrazovat data na LCD, případně vyčítat data, která byla nasbírána v průběhu sušení do PC. Senzorová jednotka zajišťuje měření relativní vlhkosti, teploty, napětí baterie a data posílá zobrazovací jednotce. U jednotek jsou použity transceivery, které pracují v ISM pásmu 868 MHz. Jako řídící obvod je použit 8-bitový mikrokontrolér s nízkou spotřebou od firmy Freescale.The purpose of this project is to build a wireless sensor network for measuring temperature and relative humidity in hop drying facility. This is a monitoring device, consists of several sensor units and one control and display unit. Display unit coordinates a whole network and can display data on LCD or download collected data to PC. Sensor unit measures a relative humidity, temperature, battery voltage and transmits data to display unit. Units contain a transceiver which operates in ISM band 868 MHz. Circuits are driven by 8-bits microcontroller Freescale.

INTERDISCIPLINÁRNÍ VÝZKUM ARCHEOLOGICKÝCH ARTEFAKTŮ POMOCÍ MODERNÍCH TECHNOLOGIÍ

The paper introduces results of projectof interdisciplinary research of artifacts throughmodern technologies based on archaeometricstudy of Prehistoric and Middle Age pottery andon chemical analyses of soils around a desertedmedieval village. Processes of production and useof the ceramic artifacts in the past society may bestudied in a better way through modern archaeometricmethods; chemical analyses of soils enablea non-destructive understanding of inner structureof areas of activities and components on archaeologicalsites. Chemical analyses of soils onthe basis of phosphate analysis were applied onexample of the deserted medieval village calledSloupek (Rokycany region) where it was possibleto defi ne spatial structure of activities in terms ofone farmstead on the basis of phosphate distributionand we were able to interpret processesrelated to abandonment of the site followed byorganic remains. Archaeometric analyses of thesettlement pottery from the Younger Bronze Ageand Middle Age pottery from České Budějoviceenabled us to understand the structure of the ceramicraw material and character of the potteryproduction. It is possible to take into considerationlocal or regional production of Middle Ageas well as Prehistoric pottery on the basis of theidentifi ed characteristics which was not related toany other production spheres

Inhibition of acetylcholinesterase in different structures of the rat brain following soman intoxication pretreated with huperzine A

Acetylcholinesterase (AChE) activities in different brain parts were determined quantitatively in rats treated with huperzine A, soman, and huperzine A followed by soman, using histochemical and biochemical methods. Following soman intoxication ( 1.2 x LD50, i.m.), AChE activity was decreased to 30-80% of control values depending on the brain structure. The most sensitive area was the frontal cortex and the most relatively resistant was ncl.ruber. Huperzine A treatment only caused a change in AChE activity varying from 70 to 100% of control values. In rats pretreated with huperzine A and intoxicated with soman, AChE activity was significantly higher than that observed after soman. In these animals, survival of rats pretreated with huperzine was observed while the mortality of unpretreated animals was near to 80%. The results suggest that huperzine A is good candidate for further study for clinical use as a prophylactic drug against nerve agent poisoning

The regulation of demineralised water level for the climatic chamber

Cílem první části práce je popsat nejpoužívanější způsoby snímání výšky hladiny. Další část se zabývá návrhem a sestrojením zařízení doplňujícího demineralizovanou vodu do nádrže klimatické komory. Z popsaných možností byly pro snímání vody v nádrži vybrány plovákové hladinové spínače. Přístroj je řízen mikropočítačem Atmel ATmega8. Sleduje množství vody v nádrži, po vyprázdnění nádrže se sepne čerpadlo, které vodu doplní. Navíc se na displeji zobrazuje průměrná denní spotřeba vody a po připojení ke stolnímu počítači přes USB je možné získat od zařízení další informace nebo zařízení z počítače ovládat.Katedra aplikované elektroniky a telekomunikacíObhájenoThe target of the first part of this work is to describe the most used methods of level measurement. The next part is concerned with the design and construction of a device for refilling demineralized water into a tank of a climatic chamber. From the described ways to measure water level, the float switches were chosen. The device is driven by a microcomputer Atmel ATmega8. It monitors the amount of water in the tank. When the tank is empty, a pump is switched on and water is refilled. In addition to this, there is an average daily amount of filled water displayed on a LED display. If the device is connected to a PC, it is possible to get more information about filling water or to control the device from the PC