Autor: Polak, M.P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Awifauna doliny Belnianki pod Daleszycami [woj.Swietokrzyskie] w okresie zimowania i przelotow w latach 1995-1996
Autorzy:: Wilniewczyc, P.
Polak, M.
Powiązania:: https://bibliotekanauki.pl/articles/32795.pdf
Data publikacji:: 2002
Wydawca:: Mazowiecko-Świętokrzyskie Towarzystwo Ornitologiczne
Tematy:: awifauna
ptaki
Daleszyce
zimowanie zwierzat
przeloty ptakow
dolina Belnianki
Źródło:: Kulon; 2002, 07, 1-2; 41-72
1427-3098
Pojawia się w:: Kulon
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The optimisation of biomass combustion in small boilers
Autorzy:: Polak, M.
Neuberger, P.
Powiązania:: https://bibliotekanauki.pl/articles/59899.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: optimization
biomass combustion
small boiler
boiler
power generation
heat generation
biofuel
Opis:: Biomass contains chemical energy which is a transformed Sun radiation. This energy can be used in many different ways. One of these is a direct combustion which is the most popular. The direct combustion of biomass is a technology which is well proven in large-scale heat and power generation. However, the situation in the small-scale heat generation is not so good. This paper describes results from the experimental combustion with various kinds of biomass in three different combustion devices. Saw dust is used in the experiment described below. The aim is to choose the best biofuel modification and the best way for its combustion from the point of view of power and emission parameters. As for the so far reached results of the experiment, the best in case of saw dust is the combustion with gasification of saw dust briquettes on stable grate without primary air or pellets in bottom supplied burner.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2008, 06
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Heat recuperation from exhaust air in a sports hall with swimming pool
Autorzy:: Nuberger, P.
Sleger, V.
Polak, M.
Powiązania:: https://bibliotekanauki.pl/articles/60995.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Opis:: This paper deals with the determination of several efficiency types of a cross-current recovery exchanger which is a part of the air venting system in the swimming pool hall on the premises of the Czech University of Life Sciences (CULS) in Prague. The product is a cross-current plate exchanger with a heat-exchanging surface of antirust aluminium. According to the manufacturer, the exchanger is fit for temperatures common in air ventilation systems. The air is forced in by fans at a flow quantity of 16,000 m3, maximum speed 2000 rpm, electric motor output 7.5 kW, filters for the air coming from the outside – grade G4, pressure loss from 42 to 200 Pa, filters for the air coming from the inside – grade G3, pressure loss from 46 to 200 Pa. The results presented are derived from in-process measurements taken on 31 January 2007 and 7 February 2007, from 9.15 to 11.30 on both days. Air temperature and air humidity were measured with 9636-51B-type sensors by Ahlborn, connected to the AHLBORN ALMEMO 5990-2 centre. These sensors were placed into each of the four input/output channels, very close to the exchanger itself (Fig. 2). The data measured were saved in the centre memory every minute. Figures 3, 4, 5 and 6 show the temperature and humidity curves at the exchanger inlets and outlets on measurement days as well as outside air temperature (te) and outside air relative humidity (φe) captured by the met station on the CULS premises. Table 2 shows efficiency ranges calculated according to relations (1), (3), (4), (5), and (6) for air parameters ascertained at exchanger inlets and outlets on 31 January and 7 February 2007 and the calculated flow rates (Table 1). The difference between the outside temperature te and outside humidity φe values taken by the met station and the temperature te1 and humidity φe1 values measured at the recuperator inlet can be explained as resulting from the air being drawn in from the premises affected by the building and 8-m air piping situated in the building’s interior. Heat transmission to the surrounding air occurs despite the mineral wool heat insulation applied to the air piping. The slight increase of thermal efficiency observed on 7 February 2007 resulted from throttling down the recuperator feed air inlet flaps. Reducing the heated air discharge volume (see Table 1) resulted in a greater temperature difference te2 – te1. Energetic efficiency η is lower than thermal efficiency ηt because equation 3 takes into account the effect of condensed vapours in the cooled waste air. According to the manufacturers, the efficiency of top-class exchangers exceeds 70 %. This value might suggest that almost all the air energy available in the given space is utilised. Closer examination reveals that what is presented is thermal efficiency, which is always higher than other kinds of efficiency (see Table 2). Low exergetic efficiency is a sign that there still is a potential in terms of transmission of recovered air utilised energy (exergy).
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2007, 3
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Oznaczanie poziomu zawartości B(a)P w rynkowych przetworach mięsnych z wykorzystaniem HPLC
Autorzy:: Kubiak, M. S.
Polak, M.
Piszcz, P.
Powiązania:: https://bibliotekanauki.pl/articles/92330.pdf
Data publikacji:: 2010
Wydawca:: Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:: skażenie środowiska naturalnego
zanieczyszczenia artykułów rolno-spożywczych
przetwory mięsne
HPLC
Opis:: Zagadnienia związane ze skażeniem środowiska naturalnego oraz zanieczyszczeniami artykułów rolno-spożywczych wzbudzają zainteresowanie społeczeństwa już od kilku lat. W związku ze wzrostem uprzemysłowienia w ciągu ostatnich kilku dekad, ilość związków chemicznych, wprowadzonych do środowiska naturalnego przez człowieka, osiągnęła ogromne rozmiary.
Źródło:: Camera Separatoria; 2010, 2, (monographs No. 122); 153-167
2083-6392
2299-6265
Pojawia się w:: Camera Separatoria
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The practical experience with adiabatic cooling withfogging systems in the houses for pig breeding
Praktyczne doświadczeniab z adiabatycznym chłodzeniem pomieszczeń chlewni za pomocą systemów zamgławiania
Autorzy:: Neuberger, P.
Sleger, V.
Polak, M.
Powiązania:: https://bibliotekanauki.pl/articles/804334.pdf
Data publikacji:: 2002
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:: Heat stress of domestic animals has the increasing influence on the farming economy in Central Europe. It is not caused only by global warming. Substantial share in this situation has the introduction of new races of animals of higher productivity. On the other hand, breeding of the highly productive animals has a negative influence on moisture and heat increase. These problems can be solved by using direct adiabatic cooling system which is used especially in poultry production nowadays. An effort was made to use this technology for pig breeds too. The paper summarises the results from the observation focused on the comparison of cooled and non-cooled stable for pig breeding. The installation of this cooling system is one of the first example in pig houses in the Czech Republic. The decrease of air temperature by about 2.5-3 K was reached by means of evaporative cooling. However, it should be said, that the system was not adjusted to optimal parameters during the experiment, yet. We can expect the temperature decrease of about 5.5-6 K after the optimal adjustment.
Stres termiczny zwierząt ma rosnące znaczenie dla produkcji zwierzęcej i jej ekonomiki w krajach Europy Centralnej. Wprowadzanie do produkcji nowych ras zwierząt o wyższej produktywności powoduje wzrost wilgotności i temperatury powietrza w budynkach, co jest przyczyną stresu u zwierząt. Ten problem może być rozwiązany przez chłodzenie adiabatyczne, które jest stosowane szczególnie w produkcji drobiarskiej. Istnieje potrzeba zastosowania tej technologii w produkcji trzody chlewnej. Artykuł prezentuje dane porównawcze chlewni chłodzonych i niechłodzonych. Instalacja takiego systemu chłodzenia należy do pierwszych w Czechach. Dzięki chłodzeniu przez odparowanie uzyskano obniżenie temperatury powietrza o 2,5-3 K. Należy stwierdzić, że system nie był optymalnie skonfigurowany. Po jego usprawnieniu można oczekiwać obniżenia temperatury powietrza o 5,5-6 K.
Źródło:: Zeszyty Problemowe Postępów Nauk Rolniczych; 2002, 486, 1
0084-5477
Pojawia się w:: Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Energy sorrel - an alternative fuel for rural areas
Autorzy:: Polak, M.
Neuberger, P.
Sleger, V.
Powiązania:: https://bibliotekanauki.pl/articles/61420.pdf
Data publikacji:: 2007
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Opis:: The research is focused on energy sorrel as a fuel for local low-power heating systems with output up to 100 kW. Sorrel is perennial plant surviving in its location nearly 18 years which is very good from the point of crop expenses. It is a robust plant with height of about 2 m in second year of plantation. Dry phytomass is energetically rich fuel with total heating value 17.5 – 18.0 MJ.kg-1 at the average yield of 10 tons per hectare. An experimental combustion of pure sorrel and its blends were done with boiler VERNER A25 – a hot water boiler for pellets. 11 different sorrel fuels consisting of 5 primary kinds were tested during the experiment: sorrel (Rumex tianshanicus x Rumex patientia), Phalaroides arundinacea, Canabis sativa, pine-bark, sorrel (Rumex tianshanicus x Rumex patientia), brown coal. Based on collected data it is possible to obtain an overview of these fuels and their emission properties. Satisfactory values of CO concentration are possible to gain partly by choosing appropriate combustion device and its settings and partly by mixing with other types of fuel. In the case of sorrel the combination of both has been shown very useful. It is very hard to combust sorrel only, and its testing proves unsatisfactory results. But if we combust blend of sorrel and canary grass 1:1 in the same device, the results are somewhat better. The best results can be reached if we burn this blend in more suitable device. By this way it is even possible to fulfil the emission limits. However, if we burn only pure sorrel in another burner, the emissions are very dissatisfactory again. Another possibility of how to burn sorrel effectively is to combine it with brow coal. On the basis of received results, fuel containing 10 to 20 % of coal can be recommended. From point of view of ash properties pure sorrel appears a problematic fuel. During our experiment ash accumulation in combustion chamber was observed. Unburnt fuel blocked air intakes which caused burning deterioration and increase of CO emissions. All above mentioned facts indicate that sorrel burning is possible if we fulfil all demands required for this fuel. Combustion of pure sorrel in any device without special settings means in many cases non effective use of fuel and bad emissions.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2007, 3
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Feasibility of using heat-recovery exchangers in livestock buildings at a site at a specific altitude with a specific average outdoor air temperature
Autorzy:: Sleger, V.
Neuberger, P.
Polak, M.
Powiązania:: https://bibliotekanauki.pl/articles/62353.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: feasibility
heat-recovery exchanger
livestock building
outdoor air temperature
climate condition
Czech Republic
agriculture
air temperature
weather station
ventilation
air exchange
heat exchanger
Opis:: The installation of an energy-saving facility must be preceded by analysis of its financial effectiveness. Among methods enabling such evaluation is the basic net profit calculation method. For this, the annual consumption of electricity for ventilation or of thermal energy for heating must be determined. The calculation formula uses the sum of energies for temperatures within the range from the calculation temperature for the area in question to the long-term average of the maximum temperature at the site, or to the temperature at which the heating power is zero. It is necessary to know the summary time of occurrence of a given temperature during a year. The site data can only be assessed based on long-term meteorological information. In fact, data used by current national standards to describe climatic conditions in the Czech Republic are from the years 1901 to 1950. The dependence of the average yearly temperature on altitude is shown in Fig. 1 for the 1961 1990 and 1991 2000 periods. It is evident that the average temperatures for the latter period are nearly 0.6 K higher than those for the former period, irrespective of the altitude. In this paper the climatic conditions are assessed based on daily data measured throughout the period from 1 January 1991 to 31 December 2000. Weather stations were selected so as to achieve a uniform coverage and continuity of measurement at each site (as far as possible). All the stations lie in the Czech Republic between 48.8° and 50.8° north latitude at altitudes from 158 m to 1324 m. It was the objective of this examination, based on the meteorological data collected to calculate the average number of days and hours during which the temperature during the year is lower than a specific limiting level, in dependence on the average yearly temperature of the site. Fig. 3 shows the average number of days in a year during which a temperature lower than a selected limiting level occurs, as calculated for the 1991 2000 period. The results are presented for 4 areas with average yearly temperatures of 6 °C 7 °C, 7 °C 8 °C, 8 °C 9 °C, and 9 °C 10 °C, respectively. The graphs enables us to ascertain the number of days during which a heating facility is in operation if the facility is activated by outdoor air temperature decrease to below a specific limiting level. If a typical daily temperature wave is considered, the method makes it possible to estimate the number of hours during which the air temperature is lower than the limiting level chosen. The difference between the data for various limiting levels allows us, for an area with a specific average yearly temperature to ascertain the time of occurrence of outdoor temperature within various ranges. The results of calculations are shown in Fig. 4 and Table 1. The method applied enables underlying data to be prepared for the assessment of energy demands for air heating at a given site and for estimation of the energy savings that could be achieved by installing economical air heating facilities in livestock buildings.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Magnetic and Structural Study of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting
Autorzy:: Hawelek, L.
Wlodarczyk, P.
Zackiewicz, P.
Polak, M.
Kaminska, M.
Puźniak, R.
Radelytskyi, I.
Kolano-Burian, A.
Powiązania:: https://bibliotekanauki.pl/articles/1402326.pdf
Data publikacji:: 2015-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Sg
75.30.Kz
61.05.C-
61.66.Fn
Opis:: Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.
Źródło:: Acta Physica Polonica A; 2015, 128, 1; 76-80
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki