Global trends in the development of modern electrical devices include also eco-friendly demands. One of the areas is seen in environmentally friendly batteries (electrochemical power sources) which do not contain poisonous and heavy metals. Modern structures based on coated textile materials are an alternative to the current all-metal electrodes. The use of environmentally friendly metals often entails the necessity to apply multiple layers of metals, which negatively affects the lifetime of the electrodes and battery cells. Accordingly, this paper focuses on the design and manufacture of monometallic textile electrodes for "green" batteries, i.e. the use of ecological technologies for eco-friendly electronics, especially the new-generation electrochemical power sources. The proposed technological processes were verified by realization of specimens and measurement in laboratory conditions with good results. Industrially applicable technologies were used for applying a thick monometallic deposit to create the specimens. This will allow future mass production and deployment in electrical engineering applications.
Present production of electronic devices requires gently handling with raw materials, whereas production costs and demands on environmental friendliness increase. This lack largely solves modern conductive textile materials that can be used as a barrier against electromagnetic and electrostatic fields as well as functional electrically conductive structures for use in the manufacture of textile antennas. The basic parameter of these materials is electrical conductivity, which is determined by resistance measurement of the fabric. Production therefore precedes measurement. This paper focuses on optimization of consumption of raw materials by the method of modelling of conductive textile structures so that electrical conductivity can be calculated preferentially to the fabric production. Model focuses on the calculation of resistance of the fabric to derive the electrical conductivity according to the methods specified in the standard EN 1149-1.
Electrically conductive textile materials can be successfully used also as textile conductors. Electrical heating system consists of power supply, supply conductors and the appliance which is formed by electrically conductive textile material with the ability of heat production. The paper presents modelling principles of these materials. Preparation of samples is discussed. Measurement techniques are described and the results show specific conditions for advantageous use of these materials especially in the area of medical applications.
Surface conductance is one of the main parameters which describes basic characteristics of specific textile materials. These textile materials are used, for example, in environments with higher requirements on hardware electrostatic protection during their production process. Published measurement standardized methods are followed by modeling methods which do not reach satisfactory results. This paper is therefore focused on the modeling of surface conductance of textile materials. The results show that the structure of textile materials can be seen as serial-parallel connections of resistors. A derivation of this model is described.
The implementation of femtocells introduces many technical challenges that must be solved in order to fully exploit their potentials. This deliverable primarily focuses on control procedures for radio resource management addressing the most critical issues. issues.
Antarctica is an area without wired networks. The main instruments for data transfers are wireless networks, especially satellite ones. Their number is naturally limited. In the area of Antarctica there are special conditions such as yearlong low temperatures, limited power sources or period without human presence in the case of Czech base station. The scientists from all over the world try to research land, ice, different kinds of animals and plants, air or UV radiation. They naturally use a lot of kind of devices which help them in their research. The paper describes communication system which ensures yearly data transfer from Antarctica to Czech Republic respectively Internet.
This paper investigates influence of femtocells to the traditional mobile network hierarchy and their features. This upcoming technology is supposed to be widely deployed in the upcoming wireless and mobile networks. These small base stations are designed to improve indoors capacity, reducing macro cell traffic or to provide services in locations without signal or with weak coverage. The paper discusses usage of femtocell and related challenges, such as interferences, frequency spectrum planning, handovers or integration of femtocells into mobile networks.
A Core Network of UMTS has a very long development. The first version of Core Network corresponds to an improved GSM/GPRS core network. The interfaces are changed and later all conception. The main changes are in using Internet Protocol, adding IMS functionality and finally in complete new Packet Core of technology called Long Term Evolution. From user point of view it means increasing bit rates from tens kbit/s to tens Mbit/s, offering multimedia services, access to Internet, etc. This paper gives an overview about evolution of UMTS Core Network.