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Program for the free space optical link power budged calculation
Vaculík, Jakub ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
With increasing demands for transit capacity of data networks as well as communication network optical networks seem to be the suitable solution. Light beam is attractive to use for data transmission . Transmitted data can be expressed by means of light impuls.. For execution of the project we need the whole optical telecommunical system which consists of transmitter, transmission link and receiver. The target of transmission link is to transfer optical beam from its resourse to detector with minimal losses. The optical fibre or optical freespace optical link FSO are used for this purpose. Connection to internet by optical fibre is out of reach for most households and plants, it is very expensive and so far it isn´t in the offer of network operators and service providers. (at lest in our condition). But there is still the posibility to obviate optical fibre networks and reach high permeability and safety of communication by means of freespace optical links. It is much easier to implement, but only for short distance. FSO enables quick and even ecological communication which is in the world of more famous radio frequency networks very pleasant message.
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Energy consumption of equipressure and various pressures technical alcohol distillation
Audy, Dan ; Leštinský, Pavel (referee) ; Smejkal, Quido (advisor)
This hork compares the heat consumption of two units for the production of technical alcohol. The aim is to compare ordinary arrangement of rectifying distillery with an alternative arrangement, based on a modified pressure device profile. The first unit is based on the classic arrangement brewhouse, working at atmospheric pressure. The alternative unit works with different pressures in columns. In this case, the pressures are chosen so that it was possible to use heat from the head of overpressure rectification column for reboiler of vacuum mash column. The principle of pressure differences between the two columns and appropriate choice for this difference also allows the beneficial use of surplus heat. It also reduces the risk of clinkering incrusts in reboiler mash column because this works at lower temperatures than the mash column atmospheric embodiment. The comparisons of the media in this work are: The amount of steam used for reboilers of both columns, the amount of cooling water used for condensation and cooling of process streams. Furthermore, an approximate estimate of electricity consumption for pumps and other machinery. For both units is considered the same amount of mash and the same amount of product of comparable quality. The product was a technical alcohol 96.4% aa at a temperature of 25 ° C.
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Alternative pellets production
Janíček, Jakub ; Lisý, Martin (referee) ; Baláš, Marek (advisor)
This bachelor thesis contains a review of possible technologies for the production of pellets and briquettes. Emphasis is placed on technology for the treatment of biomass for further use. Easy to biomass use is subject to the homogenization and adjusting to the wood chips, pellets or briquettes. The final part of thesis is concerned with energy and economic balance of a specific production line pellets.
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Balance of import and export of foodstuffs CZ-Poland in the last decade (focused on meat products)
Hrubá, Andrea ; Olšanová, Květa (advisor) ; Kubů, Martin (referee)
The bachelor thesis is focused on import and export balance of foodstuffs, mainly meat products, between the Czech Republic and Poland in years 2003 -- 2013. It analyses foreign trade with foodstuffs, especially with meat products of these countries and evaluates ascertained data in terms of time span of ten years. It describes the effect of major events on the imports and exports. They are: The entry of both countries into the European Union in 2004, the global financial crisis in 2008 and problems with the quality of foodstuff originating from Poland in year 2013. The aim of the bachelor thesis is to map, evaluate and summarize ascertained data and highlight the results and consequences.
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Hodnocení systému hospodaření zemědělského podniku se souběžnou ekologickou a konvenční produkcí
Filip, Václav
The aim of the thesis was to evaluate the enterprise management system with organic and conventional production. In 2013, the company Jamenská a.s., Jamné nad Orlicí cooperatives cultivated 542,14 ha of agricultural land the conventional way and 205,21 ha of agricultural land organically. Farms in the southeastern part of the Orlické Mountains at an altitude of 450 up to 730 meters, in the production area is the mountain (H1). On the basis of the data obtained from the period 2008 to 2012 have been calculated for both the Centre's basic environmental, economic and social indicators of sustainability evaluation. Overall evaluation of the agronomic indicators, both parts of the company for the entire reference period is very good, above the limit of sustainability. For conventional land balance has reached average values of N 46,89 kg.ha-1 (P) 5,8 kg.ha-1, (K) -29,77 kg.ha-1, the average supply of organic matter into the soil shall be 5,15 t.ha-1, the specific energy consumption 153,7 MJ.OJ-1, the intensity of plant protection is 54,49% of the average of the CZECH REPUBLIC and evaluation of biodiversity at 0,74. For erosion indicator was found violating the GAEC standards I and II. For the eco-farmed land balance N -3,2 kg.ha-1 (P) -5,7 kg.ha-1, (K) -38,63 kg.ha-1, the annual supply of organic matter into the soil is 3,5 t.ha-1, the specific energy consumption of 127 MJ.OJ-1, the intensity of plant protection 0% of the average of the CZECH REPUBLIC and evaluation of biodiversity 0,78. Also in the organic part of the GAEC standards have been infringed, I and II. Evaluation of economic indicators was also positive, the sales achieved by conventional parts were 22.021 CZK.ha-1 and in the ecology of 21.863 CZK.ha-1. The liquidity of the company for the whole of the reference period amounted to 3,65 and the debt ratio was 26,7%. From the social indicators were monitored, remuneration, working hours, holidays, health and safety at work, employee involvement in company management and social commitment. The values of sustainability was achieved for the rewards for work, vacation and employee involvement. Both parts of the company Jamenská a.s., work well and are sustainable.
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Bilance dusíku v půdě ve víceletých polních experimentech
Prchalová, Renáta
The objective of the present study was to evaluate the effect of various forms of fertilisers (mineral, organic, and their combinations) with graded rates of N (N0, N1, N2, N3) on yields of crops (peas, winter wheat, root and tuber crops, spring barley) and the N content in the staple product (HP) and by-product (VP); subsequently to assess the nitrogen balance (uptake and output) in the individual crops in 2009 -- 2012. Experiments involving 9 combinations of fertilisation were established in 1996 at 13 ÚKZÚZ (Central Institute for Supervising and Testing in Agriculture) stations lying in different soil and climate conditions (potato growing region - BVO, sugar-beet growing region - RVO). Yields differed according to region and crop. As a general rule the yields increased with the rates of nitrogen (various rates for the respective crop). Fertiliser application increased potato yields (BVO) much more than yields of sugar-beet (ŘVO). The application of the fertiliser to potatoes increased the yields of subsequently grown spring barley, while after the application of organic fertiliser to sugar-beet the differences in barley yields were minimal. The contents of N in the staple product and by-product usually increased with the N rate; the N contents in grain and straw of both cereals were higher in the ŘVO than in BVO. The total and/or average annual N balance (uptake, output) in both regions was negative in 8 out of the 9 treatments (-- 2 to -- 62 kg N/ha and -- 6 to -- 86 kg N/ha in BVO and ŘVO, respectively). There is no doubt that the application of the fertiliser considerably improved the N balance, but a positive balance was achieved only in combination with the highest N rate in the mineral fertiliser. As the results show, it is necessary to select the adequate rate of N considering the uptake by the yields.
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