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Wyświetlanie 1-4 z 4
Tytuł:
Zboża jako składnik rolnictwa i gospodarki Polski
Cereals as a component of agriculture and Polish economy
Autorzy:
Kapusta, Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/569868.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
cereals
area
production
structure
balance
self-sufficiency
Opis:
The aim of this study was to: a) show the place and role of cereals in the Polish economy in the early twenty-first century; b) analyze changes in the area of cereal crops and their share in the structure of crops in the years 1938-2013; c) analyze trends in the size and structure of grain production in the years 1938-2013; d) perform balance of cereals and determination of Polish self-sufficiency in this product; e) characterize trends in destiny cereals; f) present state intervention in the grain market. The analysis is based on sources such as scientific publications, reports of the Institute of Agricultural and Food Economics − National Research and statistical materials. The collected material was developed and interpreted using the methods: a comparison in the horizontal and vertical form, statistical form and determine the Polish self-sufficiency in grain production in terms of technical and economical Kapusta method. Cereals are an important component of agriculture and Polish economy since they are grown by 89.5% of farms, occupy almost three quarters of crop area and are an essential component of crop rotation (2013). 19.1% of global agriculture production and 35.5% of plant production and 13.1% of the agricultural commodity production and 29.1% of crop production form an important source of nutrients, the basis of the food pyramid and a basic component of food security, cereals and their derivatives are the subject of foreign trade and a source of increasing surplus in the trade balance (2012/2013 + 1 150 thousand euros). Already in pre- WWII Poland the position of grain was high, and in post-war Poland variable with a tendency to increase their role in plantings and agricultural production. Under the influence of various factors, mainly economic and natural there are changes to the total cereal cultivation area and the individual species. The universality of cereal crops makes difficulties in disseminating biological and technological progress. Although in the post-war period there was a decrease in areas planted with cereals, their collections are on the rise; also changes its structure in favor of more intensive species at a higher value in use (wheat, barley, triticale, corn). The production is realized in order to satisfy human needs, and therefore a good measure of the production of goods per 1 inhabitant, in this case the grain. From the pre-war years to modern years grain production has increased from 404 kg per capita to 739 kg. In the balance sheet of cereals at the beginning of the twenty-first century, we have two different situations; relatively stable internal consumption is accompanied by high volatility on the production side (changes in acreage and yields), which generates the need for imports in the years of crop failure. In Poland, cereals consumed (average of the years 2000 / 01-2012 / 13, for 13 years) are as follows: grazing − 60.5%, consumption − 22.2%, sowing (reproduction) − 7.2%, industrial processing − 4.5%, other (loss defects) − 3.7%. At the same time Poland exported 15,676 thousand tons of grain, and imported 16, 530 thousand tones, i.e. 854 thousand tons more. In subsequent years, however, there were changing trends in the balance of foreign trade in grain. In the period of Polish membership in the European Union we observe the increased foreign sales of grain and milk (both exports and imports). As a result of well-developed grain processing and export of its products Poland has achieved positive balance of trade with increasing surplus with foreign countries in terms of value for several years. The cereals market in Poland − as in other European Union countries − is regulated, and this action is led the Agricultural Market Agency on behalf of the state.
Źródło:
Ekonomia XXI Wieku; 2016, 2 (10); 121-137
2353-8929
Pojawia się w:
Ekonomia XXI Wieku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gra przestrzenna w kształtowaniu struktury mieszkaniowej
Formation of housing structure using spatial game
Autorzy:
Broma, T.
Powiązania:
https://bibliotekanauki.pl/articles/294283.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
gra
parcelacja
samoorganizacja
struktura
habitat
game
parcellation
self-assembly
structure
Opis:
W artykule zaprezentowano grę przestrzenną o nazwie Parcelacja kubaturowa, która została opracowana na potrzeby projektu dyplomowego S’lowtecture: struktura mieszkaniowa. Gra jest algorytmem, który pozwala na generowanie wariantowych układów jednostek mieszkaniowych oraz ich osadzenie w bloku urbanistycznym. Jej zasady samoorganizują przestrzennie strukturę, gwarantują dostęp jednostek mieszkaniowych do niezbędnej infrastruktury, a mieszkańcom zapewniają możliwość indywidualizacji domostwa i jego elastycznego dopasowania do aktualnych potrzeb. Parcelacja kubaturowa jest próbą stworzenia algorytmu zarządzającego strukturą mieszkaniową, który ma na celu eliminację blokad, konfliktów i innych niekorzystnych zjawisk przestrzennych. Jednocześnie jego zadaniem jest pozostawienie mieszkańcom jak największej niezależności w tworzeniu jednostek mieszkaniowych. Artykuł stanowi szczegółowy opis zasad Parcelacji kubaturowej oraz symulacji przeprowadzonej na fragmencie struktury mieszkaniowej.
The article presents a spatial game called Cubic parcellation, which was created for the diploma project S’lowtecture: housing structure. The game is an algorithm that allows generating variant housing structures plans and their placement in the urban block. Its rules spatially self-assemble the structure, guarantee housing units access to the necessary infrastructure and residents the opportunity to individualize their houses and its flexibility to adapt to current needs. Cubic parcellation is an attempt to create an algorithm that will be managing the housing structure, which aims to eliminate blockages, conflicts and other negative spatial phenomena. At the same time its task is to leave to the inhabitants as much independence as it is possible while creating housing units. The article is a detailed description of the Cubic parcellation rules and the simulation carried out on a piece of a housing structure.
Źródło:
Architectus; 2017, 4 (52); 89-98
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Evaluation of the Wear Mechanism of High-Carbon Hardfacing Layers
Autorzy:
Winczek, J.
Gucwa, M.
Mičian, M.
Koňár, R.
Parzych, S.
Powiązania:
https://bibliotekanauki.pl/articles/354160.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hardfacing
self shielded flux cored arc welding
cast iron
erosion
wear
structure
Opis:
Materials based on cast irons are often used for protection against wear. One of the methods of creating protective surface with cast iron structures is hardfacing. The application of hardfacing with self shielded flux cored wire with high carbon content is one of the economical ways often used to protect machinery parts exposed to both abrasion and erosion. The wear resistance of hardfacings depends on their chemical composition, structure obtained after hardfacing, parameters of depositing process andspecific conditions of wear. As the base material in the investigation the steel grade S235JR was used. The wear behavior mechanism of hardfacings made with one type of self shielded flux cored wire and different process parameters were evaluated in thispaper. Structures obtained in deposition process were different in hardness, amount of carbides and resistance to wear with two investigated impingement angles. The erosion tests showed that impingement angle 30° gives lower erosion rate than angle 60°.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1111-1115
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structuration investigation of fast-setting self leveling underlayment based on ettringite binder
Autorzy:
Lam, Ngoc Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/1853670.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
badanie struktury
podkład samopoziomujący
podkład szybkoschnący
etryngit
structuration
structure
self-levelling underlayment
SLU
fast-setting underlayment
ettringite
Opis:
Self – Levelling Underlayment (SLU) is one of the high-performance new materials used in the construction industry. Besides the strength, other characteristics of SLU such as workability, rapid drying, rapid hardening, shrinkage compensation, smooth nature, etc. are required depending on the application. The aim of this study is to evaluate the structuration with the time of SLU through some important characteristics such as the evolution of rheological properties, ettringite, and gibbsite phase development. To this purpose, a rheometer with rotation mode and oscillation mode was used to determine the yield stress, plastic viscosity, rheological dynamic modulus (storage modulus and loss modulus). The use of these techniques is considered to be a method for monitoring structuration development in cement materials. The result shows that during the hydration process, increased plastic viscosity, yield stress, and dynamic modulus of the SLU were identified from just 5 minutes after mixing until the setting period when the transition from a fluid state to a solid-state of SLU takes place. By using a rheometer in oscillation mode, the beginning of the transition process from the liquid-state to the solid-state of SLU was identified, this method is more precise when compared to traditional Vicat method.
Źródło:
Archives of Civil Engineering; 2021, 67, 1; 513-525
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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