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Genetická struktúra deviatich plemien koníMonika Burócziová, J. Říha, R. Židek, J. Trandžík, D. JakabováActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 57-60 | DOI: 10.11118/actaun200856020057 In the present study was estimate the genetic diversity and relationships among nine horses breeds in Czech and Slovak Republic. |
3D vizualizace a tvorba konečně prvkové sítě z anatomických vzorků dřeva, Část II - Algoritmický přístupPetr KoňasActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(1), 79-88 | DOI: 10.11118/actaun200957010079 Paper presents new original application WOOD3D in form of program code assembling. The work extends the previous article "Part I - Theoretical approach" in detail description of implemented C++ classes of utilized projects Visualization Toolkit (VTK), Insight Toolkit (ITK) and MIMX. Code is written in CMake style and it is available as multiplatform application. Currently GNU Linux (32/64b) and MS Windows (32/64b) platforms were released. Article discusses various filter classes for image filtering. Mainly Otsu and Binary threshold filters are classified for anatomy wood samples thresholding. Registration of images series is emphasized for difference of colour spaces compensation is included. Resulted work flow of image analysis is new methodological approach for images processing through the composition, visualization, filtering, registration and finite element mesh formation. Application generates script in ANSYS parametric design language (APDL) which is fully compatible with ANSYS finite element solver and designer environment. The script includes the whole definition of unstructured finite element mesh formed by individual elements and nodes. Due to simple notation, the same script can be used for generation of geometrical entities in element positions. Such formed volumetric entities are prepared for further geometry approximation (e.g. by boolean or more advanced methods). Hexahedral and tetrahedral types of mesh elements are formed on user request with specified mesh options. Hexahedral meshes are formed both with uniform element size and with anisotropic character. Modified octree method for hexahedral mesh with anisotropic character was declared in application. Multicore CPUs in the application are supported for fast image analysis realization. Visualization of image series and consequent 3D image are realized in VTK format sufficiently known and public format, visualized in GPL application Paraview. Future work based on mesh improvement through mesh error statistic, image acquisition and thresholding improvement by more sophisticated filters together with code optimization for fast image analysis is discussed. Also fractal characteristics classification on microscopic scale level is taken into account for further work. |
Vliv exprese genu pro HPPD na obsah vitaminu E v ječmeni jarnímMichal Kosař, Lumila Holková, Natálie Březinová Belcredi, Jaroslava EhrenbergerováActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(4), 13-18 | DOI: 10.11118/actaun200957040013 The enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD) has a very important role in the biosynthetic pathway of vitamin E. Its activity influences the final level of tocols in plant tissues. Seven barley cultivars with different vitamin E level were grown under control conditions and activity of HPPD gene was measured four, eight and twelve days after pollination of ear tissues. It was found that activity of HPPD gene corresponded with vitamin E content detected in grains (r = 0.77*). The relationship between the gene activity for HPPD eight and twelve days after pollination and vitamin E content was also confirmed for analyzed cultivars grown in the field conditions (r = 0.85*). |
Využití konceptu MDA ve vývoji strukturální oblasti prezentační vrstvyJan KryštofActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(6), 123-132 | DOI: 10.11118/actaun200957060123 This paper presents an approach for developing the presentation layer of software applications. The approach is based on the concept of the Model Driven Architecture (MDA) and uses a UML - based model of graphical user interfaces, which is created according to rules defined in a meta - model. The meta - model is not oriented to a particular platform, thus all designed models can be created independently of the programming language and widget library. This platform independent UML based model can be transformed into source - code for an arbitrary programming language and can be used in a software development process. |
POROVNÁNÍ UV A VODOU ŘEDITELNÝCH LAKŮ Z POHLEDU MNOŽSTVÍ EMISÍ VOCMilan MelounActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(4), 257-264 | DOI: 10.11118/actaun200856040257 This contribution investigates the problematic of indoor air pollution. There were tested low emitting types of lacquers - UV and waterborne lacquers. The work has been splitted in to two parts. In the first part samples of lacquers were applied on the particle board with beech veneer on the surface. Samples of air with VOCs (Volatile Organic Compounds) from lacquers were taken 3 and 24 hours after application. Tests proved that film layer of UV lacquer emit much smaller volumes of VOCs than acrylic waterborne lacquers or than 2-component epoxide waterborne lacquer. Acrylic waterborne lacquers' materials emitted especially butoxyethylene, epoxide lacquer emitted a lot of butoxyethanol and methoxypropanol and UV lacquers particularly emitted toluene, benzene and xylene. Second part of testing consists of VOCs' measuring of chosen lacquers applied on different base materials - inertial material glass and particle board with beech veneer. Tested criterion was the impact of different base material on emitted amount of VOCs. The results showed that lacquer coated on glass emit much more chemicals than lacquer on wood material. All materials were also tested on total amount of organic compounds emitted in to the air - on the TVOC. Measuring showed the same results as the first parts of research. |
Výnosy vytrvalých trav v létě a na konci vegetačního obdobíJiří Skládanka, Petr Doležal, František Hrabě, Jan Šeda, František MikyskaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(2), 105-114 | DOI: 10.11118/actaun200957020105 The paper deals with the yields of Festulolium, Dactylis glomerata, Arrhenatherum elatius and Festulolium-Dactylis glomerata mixture during the growing season and at the end of the growing season. The yields were assessed in the Bohemian-Moravian upland at 560 m a.s.l. A small-plot experiment was established in three repetitions. The assessment was made in three subsequent years. The experiment was annually fertilized with 50 kg.ha-1 N, 30 kg.ha-1 P and 60 kg.ha-1 K. Evaluated were dry matter yields and RYT values (Relative Yield Total) in the mixture of Festulolium and Dactylis glomerata. In summer, the sward was used either for one cut (harvest in early June) or two cuts (harvests in early June and late July). At the end of the growing season, the stand was harvested in October or in November or in December. Yields of the first cut in early June ranged from 5.90 to 9.12 t.ha-1. Yields of the second cut in late July ranged from 1.05 to 4.60 t.ha-1. Statistic difference between the species was significant (P < 0.05) in the respective cuts. Total yields of dry matter in the growing season ranged from 7.51 to 10.05 t.ha-1. Number of cuts and year showed a statistically highly significant influence (P < 0.01) on DM yields. The mixture of Festulolium and Dactylis glomerata exhibited an additive relation (RYT = 1) in the first cut and an antagonistic relation (RYT < 1) in the second cut. At the end of the growing season, the yields ranged from 0.71 to 2.27 t.ha-1. Average yields of one-cut swards (harvested in summer in early June) were at the end of the growing season 2.27 t.ha-1 and average yields of two-cut swards (harvested in summer in early June and late July) were 0.79 t.ha-1. From October to December, the yields were decreasing from 1.78 to 1.32 t.ha-1. Species, number of cuts in summer, harvest date at the end of the growing season and year showed a statistically highly significant influence (P < 0.01) on dry matter yields. In the first two production years, the mixture of Festulolium and Dactylis glomerata exhibited an antagonistic relation (RYT < 1) at the end of the growing season. In the third production year, the relation between Festulolium and Dactylis glomerata as expressed by the RYT value could be identified as synergic (RYT > 1). |
Dědičnost rezistence meruněk k viru šarky švestky u potomstev odrůdy 'Harlayne'Petra Pilařová, Boris KrškaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 243-250 | DOI: 10.11118/actaun200957050243 Natural resistance to Plum pox virus (PPV), the agent of sharka disease, is one of the most important traits of interest to stone fruit breeders, although few sources of resistance have been identified. One of the few apricot cultivars which does show resistance, 'Harlayne', was chosen for a study of the genetics of PPV resistance. It was crossed with three different cultivars, two susceptible ('Vestar' and 'Strepet') and one immune ('Orangered'). Four different lines (since there was one reciprocal combination) were established and the F1 crosses were subsequently inoculated with the PPV-M and PPV-D strains by grafting infected buds. A woody indicator Prunus persica 'GF 305' was then also top-grafted onto the plants of three of these F1 populations. The observations of leaf symptoms and accompanying ELISA tests were performed over three, or in one case five, growing seasons and then hybrids were classified accordingly, as either resistant or susceptible. The resistant : susceptible ratios were calculated and compared with expected theoretical ratios using the χ2-test. The ratios of resistant to susceptible plants in the progeny derived from the four apricot crosses are compatible with the hypothesis of three dominant genes being responsible for PPV resistance, with 'Harlayne' being heterozygous for all three genes. However, the possibility that resistance is controlled by just two dominant genes can not be ruled out just yet. |
POROVNÁNÍ ZÁKLADNÍCH TĚLESNÝCH MĚR ACHALTEKINSKÝCH KONÍ CHOVANÝCH V ČESKÉ REPUBLICE, RUSKU A KAZACHSTÁNUMichaela Prausová, Iva Jiskrová, Eva Sobotková, Libor MajvelderActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 181-186 | DOI: 10.11118/actaun200856050181 Our research object was to record and to measure as much as possible Akhalteke horses, which are bred in Czech Republic, Russia and Kazakhstan. We measured and recorded 3 basic body measures - Height at withers, chest girth and girth of cannon. The only condition we have was the age of horses determined on to 3.5 years and older. At the end we recorded 260 horses. We divided the values to the groups according to state, sex and age cathegory. We use the GLM method and Tukey-B test to evaluate the results. The results of the analyse of the Height at withers (HW) shew the statistically conclusively lower values of Czech horses than in horses from Russia and Kazakhstan. The average of the HW of Czech Akhalteke horses is 154.0385cm, in comparison with Russia 157.94 cm and Kazakhstanu 156.53 cm. Next we found the statistically conclusive differencies of the values of the Girth of Chest (GCh) between Akhalteke horses from Russia (179.65 cm), Czech Akhalteke horses (177.08 cm) and horses from Kazakhstan (174.82 cm). Also the Akhalteke mares (180.06 cm) had the statistically conclusivelly higher the GCh than stallions (176.58 cm). |
HODNOCENÍ VLIVU KAPKOVÉ ZÁVLAHY NA KVALITU HROZNŮPatrik BurgActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 31-36 | DOI: 10.11118/actaun200856010031 Drip irrigation constitute one of the general factor by viticulture production. Their wide utilization it is possible expect in warm south exposed regions of southern Moravia. Gist is deficienty of rainfall during the vegetation (about 500 mm), which espressivo yield and qualities performance. Principal aim research design solving on constitution horticultural techniques is verify and valorize influence drip irrigation on growth vine guilty and qualities her performance in climatic and soil conditions of southern Moravia. Subsequently formulate valid findings for users of drip irrigation, which enable their efficient utilization behind contemporary reservation regular, high-quality harvest. |
Vyhodnocení produkce mléčného tuku a bílkovin inbredních a outbredních holštýnských kravJiří Bezdíček, Jan Šubrt, Radek Filipčík, Jan ŘíhaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 19-26 | DOI: 10.11118/actaun200957050019 The aim of this study was to explore the depression effects of level of inbreeding on kg of fat and protein presented in the form of breeding values. The data included cows calved in the years 1990-2006 at farms in the Czech Republic. Inbred cows were grouped according to Fx coefficients (Fx = 1.25%, Fx = 2.0-3.125%, Fx = 4.0-12.5% and Fx = total). The breeding values for inbred cows were compared with their outbred equals (2689 equals in sum) - half-sisters, sharing the same sire, dam reaching the same breeding value (± 5%) and their first calving occurring at the same farm, at the same time (±2 month). The PROC GLM of SAS® with fixed effects (age at first calving, year of calving, number of lactations, first calving interval and relative breeding value of sire and dam were applied to all data). |
VLIV VÝUKY NA VNÍMÁNÍ VYBRANÝCH TYPOGRAFICKÝCH VLASTNOSTÍ DOKUMENTŮPetra Talandová, Jiří RybičkaActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 189-198 | DOI: 10.11118/actaun200856060189 This paper concentrates on the problems of documents quality evaluation and perception. It presents the results of our own research which was made at our faculty in last months. The research was aimed at marketing materials, their quality and their evaluation by customers. After another comparative research we have concentrated on the question of typography and its evaluation by customers. It has been proved that typography, although not very visible for many readers, does influence readers' evaluation of the whole document. |
VLIV SUMY EFEKTIVNÍCH TEPLOT NA AKUMULACI ZÁSOBNÍCH LÁTEK V KOŘENOVÉM SYSTÉMU VOJTĚŠKY SETÉ (MEDICAGO SATIVA L.)Josef Hakl, Jaromír Šantrůček, Pavel Fuksa, Josef KalistaActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 81-86 | DOI: 10.11118/actaun200856020081 The aim of this study was to investigate the relation between growing degree day method and accumulation of root reserve saccharides before over wintering by alfalfa (Medicago sativa L.) in the condition of Czech Republic. In 2002-2004, the field experiment was conducted at the Research station of the Czech University of Life Sciences in central Bohemia. The interval between summer and last autumn harvest was 40-50 days or 60-70 days, respectively. These intervals were expressed as cumulative growing degree-days (GDD) for each year. The plants were sampled in each autumn with four replicates for each variant; the average depth of sampling was 150 mm. The weight of roots, amount of starch, and water soluble saccharides (WSC) per m2 was determined. The total accumulation of root reserve saccharides was determined mainly by conditions during all vegetation period. The length of the interval or cumulative GDD influenced only variation of this basic amount. The GDD was corresponded better with starch content whilst WSC was more related to length of the interval. In central Bohemia condition, the GDD 600-700 °C was preliminary determined for maximal accumulation of root reserve saccharides. The GDD above this level did not significantly increase the root reserve accumulation. For exact verify of this model, other experiments in more sites are needed. |
Rozšíření a biologie jestřába lesního (Accipiter gentilis L.) v ChřibechMartin Tomešek, Petr ČermákActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(1), 153-164 | DOI: 10.11118/actaun200957010153 In 2002-2006, mapping the goshawk (Accipiter gentilis L.) population was carried out at the SE edge of the Chřiby Upland, the Czech Republic. At the same time, the food spectrum of the predator was determined in detail in 2004. The studied area amounted to about 30 km2. In the area, 5 nest localities occurred. Each year five occupied nests were observed. The food spectrum was analysed according to leftovers of food in nests and in the vicinity of the nests. In total, 387 leftovers of food were found. Birds represented 52%, mammals 42% and other animals (insect, reptiles etc.) 6% of prey. The population of goshawk was monitored from the period of a wedding flight to a period when young birds left their nest during the period of five years. The number of eggs was on average 2.9 per one nest. The total number of laid eggs was 73 during five years. The number of brood was on average 2.7 per one nest. Sex ratio was 47/53 per cent in favour of males. The total number of hatched birds was 68 during five years, out of the number 32 females and 36 males. Moreover, dimensions of nests at particular localities were also determined. The diameter of nests was on average 72.2 cm and the mean height of the actual nest was 48 cm. Nests occurred at an average height of 21.3 m. |
Chování vybraných stolních tuků při dynamickém zatěžováníŠárka NedomováActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(4), 43-54 | DOI: 10.11118/actaun200957040043 The new method of the evaluation of the mechanical behaviour of fats has been designed. This method is based on the evaluation of the fat response to dynamic loading. Dynamic loading has been realized by fall of bar impact. Response function has been represented by the time history of the fat surface displacement. Response of the tested table fats have been evaluated both in the time and frequency domain. Two factors affected rheology of the examined fat products: temperature of the measurement and product origin. The influence of fat content can be described namely in the frequency domain. The results obtained between 14 and 20 °C showed significant differences in the fat rigidity. |
Štatistická analýza zmesí v pravdepodobnosti ruinovaniaRastislav Potocký, Milan StehlíkActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(6), 209-214 | DOI: 10.11118/actaun200957060209 If the hypothesis on exponentially distributed claims in a risk (or surplus) model is untenable then, in many cases, the assumption that they are mixtures of two (or more) exponentials is a suitable substitute. In the first part of the paper tests of homogeneity for exponentially distributed claims are discussed and their properties are stated. The statistical properties of parameter estimations for such claims are also mentioned. In the second part the classical Cramer-Lundberg ruin model is discussed when claims are distributed as mixtures of exponentials. Our attention is focussed primarily on assesment of accuracy of approximations obtained. Then our results are compared to those already known. |
VÝVOJ REGIONÁLNÍHO HDP V KRAJÍCH ČR SE ZAMĚŘENÍM NA METODICKÉ ASPEKTYMonika Nováková, Luděk KoubaActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 77-92 | DOI: 10.11118/actaun200856060077 The regional GDP is used in the European Union as the important indicator to the distribution of the European funds. However in the Czech Republic this indicator has had only a short history because regional GDP started to be constructed in the half of the ninetieth. The aims of the paper are to present and evaluate the progress in the process of the regionalization of the GDP in the Czech Republic, review economic productivity of the Czech regions (level NUTS 2 and NUTS 3) and finally point out the persisting weaknesses of the regionalization of the GDP in the Czech Republic. First part of the paper describes problematic beginnings of the process of the regionalization of the GDP, evaluates changes of the methodology and discusses the actual state of this affair. Second part of the paper describes the variability of GDP among the Czech regions at level NUTS 2 and NUTS 3. Alternative modifications of the indicator GDP (for example GDP, GDP per capita, rate of growth) are used in this regional analysis. Consecutively relative positions of individual regions in the Czech Republic are discussed. There are pointed out some contradictions in the Czech regional statistics in this paper. The defined drawbacks indicate possible way of the research into the future. |
Vliv tvorby superplodných linií na velikost vrhu v rozmnožovacích chovechZdeněk Tvrdoň, Petr HumpolíčekActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(2), 151-154 | DOI: 10.11118/actaun200957020151 The hyperprolific line is considered to be maximally effective in pursuit of progress in sow's reproduction. Hyperprolific line efficiency is commonly evaluated in regard of breeding herd progress. We decided to study how effective it is with respect to increasing of litter size in multiplication herd. Our study is specific by using the data from practice, concretely it is based on the information about the ancestor of sows in multiplication herd. The ancestors could be the member either hyperprolific line or normal line. The information about performances of sows breed in multiplication herd was known. The mixed linear models in SAS for Windows 9.1.2. were conducted to statistical analysis. Our results indicated that no significant effect on litter size was achieved by selection criteria used in the hyperprolific line creation. In studied population no differences between TNB, NBA or NW were found on the 1st as well as on the 1st-5th litters. As we have mentioned above, the study is specific by using the data from practice. Therefore the studied population size is limited. It is necessary to take into consideration when the results are applied. Nevertheless, the results shown that other studies with larger population should be done to reevaluate the selection criteria. |
MOŽNOSTI VYUŽITÍ USMĚRŇOVACÍCH STAVEB V RÁMCI REVITALIZACE TOKUJana SynkováActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 279-284 | DOI: 10.11118/actaun200957050279 Directing and concentrating structures are used mainly on water coursers with unstable channel and major sediment transport or in areas with major bank erosion. The main purpose of these structures is to redirect water flow from the stressed and very often eroded bank to the centre of the channel or other parts of the channel, where the water flow may be used e.g. for dispersion of unsuitable deposit before its eventual stabilization by natural succession. |
Analýza faktorů kvality výřezů vyráběných harvestoryJan Honsa, Jindřich NerudaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 131-140 | DOI: 10.11118/actaun200957050131 Increasing demands of the present society lead to an effort to rationalize logging operations in forest management. Therefore, multi-function logging machines are increasingly used in the course of timber harvesting. Nevertheless, the economic effectiveness of these machines is affected not only by their productivity or environmentally friendly operations but also the quality of performed work. It can be evaluated by the assessment of the quality of produced assortments. Decreasing quality of produced logs can result in the reduction of marketability and wood price. Thus, the aim of this paper is to determine some defects originating at the harvester production of assortments and specification of their potential causes. |
Využitelnost biomasy pro proces zplyňováníJosef Spěvák, Miroslav HavlíčekActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 147-156 | DOI: 10.11118/actaun200856020147 Biomass as one of the renewable resources of energy has bright future in utilization, especially in obtaining various forms of energy (heat, electrical energy, gas). |
Porovnání bachorové degradovatelnosti škrobu kukuřičného zrna a kukuřičných siláží in vitro metodouOlga Tománková, Petr HomolkaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(1), 165-170 | DOI: 10.11118/actaun200957010165 The objective of this experiment was to determine the ruminal degradability of starch using the in vitro method. Maize silages from whole plants (MS), maize cob silage prepared by ensiling of the cobs with bracts (MCS), and maize grain silages (MGS) were compared with maize grain (MG). The tested feeds differed in total starch contents. Averaged starch contents with standard deviation values were 343.3 ± 18.7 g/kg for MS; 522.0 ± 8.9 g/kg for MCS; 727.9 ± 16.9 g/kg for MGS; and 682.8 ± 22.6 g/kg dry matter for MG. The in vitro ruminal degradability of starch was determined by the feed incubation period - for 2, 4, 6, 16 and 24 hours. The higher degradation was observed at the 4-h of incubation for maize silage from whole plants (46.6 ± 4.9 %), maize cob silage (41.2 ± 1.6 %) and maize grain silage (39.7 ± 1.4 %) as compared to maize grain (32.0 ± 1.0 %). Enhanced values of the in vitro ruminal degradability of starch continued to increase until the 24-h of incubation, when the differences between silages and maize grain were balanced. A significant difference of the curves of degradability profile was found between silages and maize grain (P < 0.0001) but was not significant between MS, MCS and MGS. |
Odezva Eidamu na nedestruktivní rázŠárka NedomováActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(4), 55-62 | DOI: 10.11118/actaun200957040055 The behaviour of the Edam cheese during its maturation under dynamic loading has been studied. The block of tested cheese has been loaded by the impact of an aluminium bar. The force between bar and cheese has been recorded. The surface displacements as well as the surface velocities have been obtained at the different points from the point of the bar impact using of the laser vibrometers. Response functions have been evaluated both in the time and frequency domains. It has been found that the degree of the cheese maturity is well characterized by the attenuation of the surface displacement maximum. This maturation is also described by the maximum of the impact force. The spectral analysis of the response functions revealed that there was a dominant frequency, which depends only on the degree of the cheese maturity. The developed method represents a promising procedure for the continuous recording of the cheese ripening. |
VYUŽITÍ DISTRIBUČNÍCH A KORELAČNÍCH TESTŮ PRO TESTOVÁNÍ HYPOTÉZY EFEKTIVNOSTI ČESKÉHO KAPITÁLOVÉHO TRHUPetra Střelcová, Luboš StřelecActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(6), 241-252 | DOI: 10.11118/actaun200957060241 This paper deals with efficiency testing of the Czech stock market. In this work there are defined different forms of efficiency, whereas key attention is focused on the weak-form of market efficiency. The goal of this paper is to find the weak-form of efficiency with the help of various tests. We have used some basic methods for our analysis: the autocorrelation coefficient, the Ljung-Box test and selected tests of normality - some classical normality tests (the Shapiro-Wilk test, the Jarque-Bera test, the Lilliefors test) and some robust normality tests (the robust Jarque-Bera test, the directed SJ test and medcouple MC-LR test). Source data for purpose of testing of weak-form of efficiency include years from 2000 to 2008, whereas daily and monthly logarithmic returns of the stock exchange market index PX are analyzed. In this paper we also analyze the daily and monthly logarithmic returns of the U.S. stock exchange market index DJI for purposes of comparison. |
ROZBOR CHOVÁNÍ SPOTŘEBITELE PŘI NÁKUPU VYBRANÝCH KOMODITNÍCH SKUPIN Z POHLEDU VLIVU CENY, ZVYKU, SLEVY A VLASTNOSTI VÝROBKUJitka Poměnková, Zuzana ToufarováActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(6), 93-102 | DOI: 10.11118/actaun200856060093 The aim of the paper is consumer behaviour analysis when purchasing selected commodity groups concerning the effect of price, habit, discount and product characteristics. Analysis proceed from the Czech household marketing research, where 726 households were electronically questioned. As mentioned above, selected factors for the analysis were habit, products' characteristics, price and discount actions. |
VLIV ZATÍŽENÍ SPALOVACÍHO MOTORU NA ENERGETICKÉ A VÝKONNOSTNÍ PARAMETRY TRAKTOROVÝCH SOUPRAVMilan Vojáček, František Bauer, Pavel Sedlák, Tomáš ŠmerdaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(2), 155-166 | DOI: 10.11118/actaun200957020155 The objective of this paper is to demonstrate possibilities how to reduce consumption of Diesel fuel on the one hand and to increase the performance of tractor aggregates on the other. Measurings were performed on a field with clayey-loamy soil, after the harvest of spring barley as forecrop and treatment of soil surface with disc harrowing. At the moment of measuring, the upper soil layer (till 10 cm) contained 16.5 % of humidity. Measured were the following parameters: consumption of Diesel fuel, engine revolutions, total time of ploughing, time of turning, depth of ploughing, and the swath of tractor aggregate. The specific consumption of diesel fuel Qm,1 and the efficiency (performance) of the aggregate W1 were calculated using the aforementioned parameters. The experimental tractor operated always with the full dose of fuel. Measurings were performed within zones A - economic revolutions of the engine (1 580-1 800 min-1) and B - maximum working revolutions of the engine (1 800-2 000 min-1). Basing on measured values it was found out that in zones A and B, the ploughing aggregate Case Magnum MX 285 plus a combined cultivator Köckerling Exaktgrubber - Vario showed 9.1 % of fuel saving. Values of efficiency increased by 11.5%. For the ploughing aggregate Case Magnum MX 285 plus the disc harrow Väderstad Excellent XT 620 the corresponding fuel saving was 17.2 %) while the value of efficiency increased by 7.2 %). |
Kvantifikace konkurenčních hodnot dokumentůPavel Šimek, Jiří Vaněk, Jan JarolímekActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 285-290 | DOI: 10.11118/actaun200957050285 The majority of Internet users use the global network to search for different information using fulltext search engines such as Google, Yahoo!, or Seznam. The web presentation operators are trying, with the help of different optimization techniques, to get to the top places in the results of fulltext search engines. Right there is a great importance of Search Engine Optimization and Search Engine Marketing, because normal users usually try links only on the first few pages of the fulltext search engines results on certain keywords and in catalogs they use primarily hierarchically higher placed links in each category. Key to success is the application of optimization methods which deal with the issue of keywords, structure and quality of content, domain names, individual sites and quantity and reliability of backward links. The process is demanding, long-lasting and without a guaranteed outcome. A website operator without advanced analytical tools do not identify the contribution of individual documents from which the entire web site consists. If the web presentation operators want to have an overview of their documents and web site in global, it is appropriate to quantify these positions in a specific way, depending on specific key words. For this purpose serves the quantification of competitive value of documents, which consequently sets global competitive value of a web site. Quantification of competitive values is performed on a specific full-text search engine. For each full-text search engine can be and often are, different results. According to published reports of ClickZ agency or Market Share is according to the number of searches by English-speaking users most widely used Google search engine, which has a market share of more than 80%. The whole procedure of quantification of competitive values is common, however, the initial step which is the analysis of keywords depends on a choice of the fulltext search engine. |
SROVNÁNÍ VYBRANÝCH METOD DIGITÁLNÍ KLASIFIKACE DŘEVINNÉ SKLADBY Z LETECKÝCH SNÍMKŮMartin GabzdylActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(5), 279-292 | DOI: 10.11118/actaun200856050279 This article describes a comparison of various programs for the automatic supervised classification used for identification of forest tree species representation from the aerial photographs. These programs were represented by American software Erdas Imagine 8.4, Czech products LuciaG 4.0 and TopoL DMT 6.014. The study displays a minor production forest area with proportion of four most frequently occurring tree species - spruce, larch, oak and ash in the research area of the forest region around Bystřice pod Hostýnem, the Czech Republic. For the reason of lower quality of spectrozonal photographs it was necessary to use some corrections; such as highlighting pen techniques, namely Kernel Processor Low-Frequency and High-Frequency filters, belonging to space operations. Photographs, modified in this way, served for a construction of individual training sets, which were consequently used within individual classification methods of directed classification in each comparative software. Self-classification took place at the level of a particular tree species. Classification accuracy was determined by comparison of results and reference data from the terrain research. |
Posouzení odolnosti materiálů na bázi dřeva se skelným vláknem vůči oděruPavel Král, Jaroslav HrázskýActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(1), 117-122 | DOI: 10.11118/actaun200856010117 The aim of this paper is to examine the abrasive resistance of the plywood formatted by fiberglass. Our methodology for the evaluation of the newly designed material was developed so that it corresponds to the related European standards. It is complemented with the sampling method and the preparation of the samples for examination including their climatization. According to our design, we carried out the measurements of the selected structures of fire-proof multi-layered veneer materials with coats of different surface weight in combination with the fiberglass. The gained data about the abrasive resistance can be considered as reliable. The rates of abrasive resistance were examined in reference to the EU current standards which set their area of application. This research is part of the MSMT project No. MSM 6215648902 "Les a dřevo" (Forest and Wood). |
Vliv předplodiny a diferencovaného hnojení na výnos a obsah N-látek v zrnu jarního ječmeneLuděk Hřivna, Rostislav Richter, Pavel Ryant, Michal PříkopaActa Univ. Agric. Silvic. Mendelianae Brun. 2009, 57(5), 141-148 | DOI: 10.11118/actaun200957050141 In small-plot experiments established in 2001-2004 we studied the effect of the chemical composition of the plant dry matter of spring barley, varieties Kompakt and Jersey, on grain yields. A relatively strong correlation was confirmed between the chemical composition of the plant dry matter and yields. The correlation was most intensive in the case of nitrogen (r = 0.536), phosphorus (r = 0.503), magnesium (r = 0.464) and sulphur (r = 0.431) at the beginning of shooting (DC 30); in the case of potassium (r = 0.557) at the beginning of tillering (DC 23) and calcium (r = 0.530) during ear formation (DC 55). A relatively strong correlation remained from the beginning of tillering to the beginning of ear formation and later decreased. The weather conditions of the year and variety significantly affected grain yields and also the previous crop was important. Grain yields of the variety Kompakt were statistically significantly lower than of the variety Jersey (6.02 t.ha-1 and 6.45 t.ha-1, respectively). The yields of barley grown after sugar-beet were the highest (6.30-6.79 t.ha-1); the grain yields of barley after maize decreased by 9.1-9.7 %. Higher grain yields of the Jersey variety resulted in levels of N-substances (11.35 %) lower than in the Kompakt variety (11.35 % and 11.60 %, resp.). No correlation was discovered between the nitrogen level in the plant dry matter during vegetation and the content of N-substances in barley grain. |
VLIV POVRCHOVÉ ÚPRAVY NA RYCHLOST ŠÍŘENÍ ULTRAZVUKU VE DŘEVĚTomáš Špaček, Mária Kotlínová, Michal Kloiber, Josef PolášekActa Univ. Agric. Silvic. Mendelianae Brun. 2008, 56(2), 211-216 | DOI: 10.11118/actaun200856020211 Non-destructive diagnostic methods are very useful for monumental buildings. This paper deals with one of these technique, namely with ultrasound testing and influence of surface finishing on ultrasound velocity measured by means of device the Arborsonic Decay Detector. Surface finishing (Primalex - thick synthetic film of the surface finishing, Luxol - Extra - thin synthetic film of the surface finishing and Impranal Profi SL - thick acryl film the surface finishing) were selected and tested in this research. The transmittion time was measured and velocity was converted from it. This was compared before and after application of surface finishing. |


