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Wyświetlanie 1-15 z 17
Tytuł:
Komputerowe wspomaganie konstruowania przeciągaczy do obróbki wąskich głębokich rowków o skomplikowanym kształcie
Computer helping in design of broach tools to cutting narrow deep grooves with complicated shapes
Autorzy:
Feldshtein, E.
Kamieniarz, R.
Powiązania:
https://bibliotekanauki.pl/articles/269730.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
przeciągacz
modelowanie
wytrzymałość
niezawodność
broach tool
modelling
strength
reliability
Opis:
Rozpatrzono zasady podziału ogólnej grubości warstwy skrawanej między pojedynczymi narzędziami i ostrzami zespołu przeciągaczy do obróbki wąskich rowków w elementach z mosiądzu CuZn39Pb2. W celu opracowania konstrukcji uniwersalnego przeciągacza do obróbki rowków o zbliżonym kształcie zaleca się wykorzystanie zasady modułowej. Zaproponowano metodę doboru posuwów na ostrze oraz ich kształtów zapewniającą równomierne obciążenia na poszczególnych sekcjach przeciągacza. Przedstawiono typowe rozkłady jednostkowych i ogólnych sił skrawania między ostrzami i sekcjami. Na podstawie oprogramowania CosmosWorks dokonano modelowania rozkładów naprężeń równoważących według metody Von Misesa oraz obliczono wartości współczynników bezpieczeństwa w ostrzach przeciągaczy wykonanych ze stali szybkotnącej HS 6-5-2 (d. SW7M) tradycyjnie stosowanej na narzędzia skrawające oraz stali szybkotnącej Vanadis 23 wyprodukowanej metodą metalurgii proszków. Zastosowanie stali proszkowej zapewnia wyższe bezpieczeństwo pracy przeciągaczy.
Principles of division of general cutting layer thickness between single tools and teeth of a complete broach tool for cutting of narrow deep grooves in parts from CuZn39Pb2 brass are considered. To work up a universal broach tool construction for cutting of grooves with similar shapes it is recommended using of a modular principle. The method of picking of feed per tooth and shapes of teeth to guarantee a uniform loading on single sections of a broach tool is proposed. Typical distributions of single and general cutting forces between teeth and sections are introduced. On the base of CosmosWorks computer program complete the modeling of equivalent stresses distribution under Von Mises method and factors of safety distribution into teeth of a broach tool produced from high speed steel HS 6-5-2 traditionally used for cutting tools and from powder metallurgical high speed steel Vanadis 23 is realized. It's determined, powder metallurgical high speed steel ensures the higher work safety of broach tools.
Źródło:
Inżynieria Maszyn; 2010, R. 15, z. 1/2; 104-115
1426-708X
Pojawia się w:
Inżynieria Maszyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przebieg lęgów wsiedlonych kuropatw pochodzących z hodowli – badania radiotelemetryczne
Course of breeding of released hand-reared grey partridges – radiotelemetry studies
Autorzy:
Kamieniarz, R.
Panek, M.
Powiązania:
https://bibliotekanauki.pl/articles/973700.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wsiedlenia
kuropatwa
Perdix perdix
samice
przezywalnosc
radiotelemetria
łowiectwo
ptaki łowne
przeżywalność
lęgi ptaków
metody badań
hand−reared grey partridges
perdix perdix
release
nesting
breeding success
Opis:
The aim of the study was to collect information about the course and results of breeding of hand−reared grey partridges. In the years 1997 and 2000−2001, 15 released females were radiotagged in the second half of April and observed to the end of July in western Poland. A half of the hand−reared females died within first several days. No clear differences in the course of nesting between hand−reared and wild partridges were observed, both in the case of clutch sizes and nest locations, as well as in incubation start dates. However, none of the observed hand−reared females achieved breeding success because of their high mortality as well as clutch and chick losses. The main cause of losses during breeding season were carnivores.
Źródło:
Sylwan; 2011, 155, 11; 778-783
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nicienie żołądkowo-jelitowe i kokcydia u saren w latach wyróżniających się upałami letnimi
Gastrointestinal nematodes and coccidia in roe deer in years distinguished by summer heats
Autorzy:
Kamieniarz, R.
Szymański, M.
Włodarek, J.
Powiązania:
https://bibliotekanauki.pl/articles/978901.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
parasites
body weight
prevalence of invasion
summer heat
Opis:
Parasites are the most common cause of disease in European roe deer (Capreolus capreolus), but prevalence of some invasions was smaller after a dry and hot summer. In the years 2015−2016, which were distinguished by exceptionally high temperature during summer months, the presence of nematodes and protozoa was assessed in the digestive tract of roe deer in western Poland. Studies confirmed that weather conditions may reduce gastrointestinal parasite prevalence in roe deer. In 2016, coccidiosis was not found in the examined species at all and in 2015 – it was rarely recorded. The reason for that could be the oocyst high exposure to sunlight as well as their drying as a consequence of high temperature and low precipitation. Such weather conditions also negatively affect other parasites when they are outside the host. Favourable environmental conditions for parasites probably occur more often in the forest than in the field, hence some gastrointestinal nematodes in the hot period were recorded only in roe deer in forest areas.
Źródło:
Sylwan; 2020, 164, 09; 775-782
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki determinujące aktywność saren polnych
Factors determining the activity of field roe deer
Autorzy:
Kamieniarz, R.
Szymański, M.
Panek, M.
Powiązania:
https://bibliotekanauki.pl/articles/986627.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
zwierzeta lowne
sarna
Capreolus capreolus
sarna polna
aktywnosc zwierzat
aktywnosc dobowa
aktywnosc sezonowa
warunki srodowiska
uprawy polowe
zadrzewienia srodpolne
czynniki meteorologiczne
daily activity
seasonal activity
open farmland
clumps and belts of trees or shrubs
Opis:
Between 2009 and 2011, behaviour of 15 field roe deer living in agricultural landscape in western Poland was studied using the radio telemetry method. Observed animals were active during the entire day with two distinct peaks – at the dawn and at the dusk. Moreover, night activity was greater than the day one. Such activity pattern may result from frequent human presence in the field roe deer habitat. Throughout the year, the activity rate (locations of active roe deer/all locations ratio) was higher in the agricultural lands than in clumps and belts of trees, which the most likely was the consequence of availability of easily digestible food in the crop fields (during growing season as well as after its end). Furthermore, field roe deer activity in open farmlands was the subject to bigger changes – both during warm months and in the winter it was the highest during the lowest temperature. Such changes were not observed in mid−field places with trees. However, in such places the activity rate was higher during periods of snow cover than during snowless ones.
Źródło:
Sylwan; 2018, 162, 03; 258-264
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hunting in Poland as part of the sustained development of rural areas
Autorzy:
Labudzki, L.
Kamieniarz, R.
Gorecki, G.
Skubis, J.
Wierzbicka, A.
Powiązania:
https://bibliotekanauki.pl/articles/38746.pdf
Data publikacji:
2009
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
hunting
Polska
rural development
rural area
tourism
Opis:
Due to state ownership of both free game and most forests in Poland, large hunting districts and low number of hunters, hunting in Polish hunting grounds provides an opportunity to encounter many animal species, often in their almost natural environment. The qualities of Poland’s fauna and flora as well as Poland’s accession to the EU and the resulting ease of movement have contributed to the development of hunt tourism. As a consequence, there has been a rise in the demand for services offered by rural areas inhabitants, which in turn should make local communities recognize the need to preserve the natural environment.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2009, 51, 1
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przydatność danych z wyszukiwarki internetowej do analizy intensywności inwazji biologicznej na przykładzie szopa pracza
Potential of data from the Internet search engine to analyze of biological invasion intensity on the example of Procyon lotor
Autorzy:
Dyderski, M.K.
Biegańska, A.
Królik, K.
Rydzińska, S.
Żychlińska, A.
Kamieniarz, R.
Skubis, J.
Powiązania:
https://bibliotekanauki.pl/articles/989496.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zwierzeta lowne
gatunki obce
gatunki inwazyjne
szop pracz
Procyon lotor
liczebnosc
dane statystyczne
wyszukiwarki internetowe
model ARIMA
raccoon
invasive species
predators
hunting
arima
Opis:
Biological invasions are one of the most important problems of nature conservation, which affect several branches of forestry and game management. In case of recent invasions, there is a problem with assessment of invasion intensity due to insufficient quantity of data. In Poland, eight of 31 game species are alien and three small predators are serious threat to biological diversity. The most recent of them is raccoon (Procyon lotor L.). Similarly to studies about rodents and flu, we tested potential of Google search engine to assess whether it may be used as a proxy for species abundance, by downloading search index of phrase 'szop pracz' (i.e. raccoon). We decomposed time series of search intensity in weak intervals into trend, seasonal and remainder, and identified sources of variability within these elements. We also proved, that this time series may be modeled using four moving average model, according to ARIMA technique. Seasonal element was connected with species biology – raccoon was recorded less frequently in winter, due to its lower activity in this time. Remainder was connected with entertainment and law regulation news in most popular websites, which resulted the peak of search index in 2009, when there was a change in length of hunting season for raccoon. Moreover, we proved that annual sums of search indices were positively correlated with hunting gain of raccoon (p<0.05; R²=0.34), thus studied time series is connected with biological phenomena of raccoon invasion. Our results show that search engine queries may be useful in predicting and reconstruction of biological invasions.
Źródło:
Sylwan; 2016, 160, 10; 822-828
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective Field Methods for Magnetic Systems
Autorzy:
Kamieniarz, G.
Dekeyser, R.
Musiał, G.
Powiązania:
https://bibliotekanauki.pl/articles/1930600.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.Cn
64.60.Fr
05.50.+q
75.10.Dg
75.10.Hk
75.10.Jm
75.40.Cx
75.40.Mg
Opis:
The self-consistency conditions inherent in the mean-field approximation are extended to take into account some pair correlations. Ii is shown that this extension is systematically improvable and applicable to the spin systems with short-range interactions in the entire temperature region. With two correlations included and the renormalization-group ideas implemented, the critical properties of the Ising model are satisfactorily revealed. Moreover, the improved estimates of the thermodynamical quantities for the quantum linear XY model from the finite-size calculations are found down to very low temperatures.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 413-417
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mapping of the DFT Spin Configuration Energies of Cr8Cd Molecular Ring onto the Energy Structure of Falicov-Kimball Model
Autorzy:
Wojciechowski, M.
Brzostowski, B.
Lemański, R.
Kamieniarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1386266.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Xx
71.15.Mb
73.22.-f
75.30.Et
31.15.E-
71.10.-w
Opis:
A comprehensive study of electronic and magnetic properties of a recently synthesized nonametalic chromium-based heteronuclear molecule Cr₈CdF₉(O₂C-C(CH₃)₃)₁₈ is presented, using DFT and Falicov-Kimball (FK) model approach. The magnetic moments are calculated and the spin charge density map is discussed. The exchange coupling parameters between transition metals ions are extracted, taking into account all the nonequivalent spin configurations. It is demonstrated that the energies of the spin configurations can be reproduced by the FK model with a set of parameters consistent with that for the parent Cr8 molecule. For molecular ring considered, the ground state corresponds to the antiferromagnetic configuration and the ferromagnetic configuration yields the highest energy.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 410-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Behaviour of Some 2D Lattice Models
Autorzy:
Kamieniarz, G.
Blöte, H. W.J.
Dekeyser, R.
Powiązania:
https://bibliotekanauki.pl/articles/1930586.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.50.+q
64.60.-i
64.60.Cn
64.60.Ak
64.60.Fr
75.40.Mg
Opis:
The density series of the non-interacting hard-square lattice gas model are reanalyzed by the ratio, Dlog Padé and differential approximant methods. The problem of poor consistency between series and other results is resolved. Transfer matrix calculations are performed, implementing both finite-size scaling and conformal invariance. Very accurate estimates of the critical exponents y$\text{}_{t}$, and y$\text{}_{h}$ are obtained in agreement with Ising universality. Furthermore, an improvement of the value of the critical density ρ$\text{}_{c}$ is found. In addition, the universal critical-point ratios of the square of the second and the fourth moment of the magnetization for ferromagnetic Ising models on the square and on the triangular lattice with periodic boundary conditions are reported.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 389-393
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Effects and Critical Behavior in Low-Dimensional Spin-1/2 Systems
Autorzy:
Kamieniarz, G.
Musial, G.
Dębski, L.
Bieliński, M.
Dekeyser, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964803.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
64.60.-i
75.10.Hk
75.10.Jm
Opis:
The critical coupling and spontaneous magnetization curve for the 2D-Ising model are calculated using the effective-field method with correlations. An application of the method to the quantum S=1/2 1D-Heisenberg model is presented and reliable low-temperature estimates of the specific heat are evaluated.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 445-447
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Phase Diagrams of Ashkin-Teller Model
Autorzy:
Pawlicki, P.
Kamieniarz, G.
Kozlowski, P.
Dekeyser, R.
Rogiers, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964805.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.10.Hk
64.60.Ak
Opis:
The phase diagram of the Askhin-Teller model in two dimensions is determined. Numerical calculations are performed for the simple square L × L lattice using transfer matrix technique. Exploiting finite-size scaling all unknown critical lines were obtained with good accuracy. An extended version of the Ashkin-Teller model is also considered within the molecular field renormalization group method and the critical surface for three-parameter odd-parity Hamiltonian is calculated.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 453-456
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DFT and Falicov-Kimball Model Approach to $Cr_{9}$ Molecular Ring
Autorzy:
Brzostowski, B.
Wojciechowski, M.
Lemański, R.
Kamieniarz, G.
Timco, G.
Tuna, F.
Winpenny, R.
Powiązania:
https://bibliotekanauki.pl/articles/1368686.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Xx
71.15.Mb
73.22.-f
75.30.Et
Opis:
Based on density functional theory (DFT) calculations, we present electronic and magnetic properties of nanometallic homo-nuclear chromium-based molecular rings $Cr_{9}F_{9}Cl_{2}(O_{2}C-C(CH_{3})_{3})_{17}$ recently synthesized. The magnetic moments are calculated, the spin density maps are discussed and the exchange interaction parameter is extracted. The complementary studies are carried out using the Falicov-Kimball model which reproduces very well the energy levels determined by different magnetic broken symmetry configurations obtained by DFT.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 270-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct Simulations of the Quantum Model for CsNiF$\text{}_{3}$
Autorzy:
Caramico D'Auria, A.
Esposito, F.
Esposito, U.
Kamieniarz, G.
Dekeyser, R.
Powiązania:
https://bibliotekanauki.pl/articles/1930597.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.Cn
75.10.Dg
75.10.Jm
75.40.Cx
75.40.Mg
Opis:
We address the problem of reliability of a finite-chain technique for CsNiF$\text{}_{3}$. We investigate the effect of the boundary conditions, completely neglected so far, and apply a new extrapolation procedure appropriate for quantities showing non-monotonic behaviour. From a detailed analysis of the specific heat existing theoretical estimates for the model parameters are discriminated and a strong evidence for the reliability of the direct finite-chain technique predictions is presented.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 409-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Mesoscopic Rings: Exact Simulations and Experiment
Autorzy:
Kamieniarz, G.
Matysiak, R.
Caramico D'Auria, A.
Esposito, F.
Benelli, C.
Powiązania:
https://bibliotekanauki.pl/articles/2014557.pdf
Data publikacji:
2000-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.40.Cx
75.10.Jm
Opis:
A numerical transfer-matrix approach and an exact diagonalization technique exploiting the point-group symmetry are worked out in the framework of quantum statistical mechanics and group theory for finite rings. They are applied to spin models of the high nuclearity cyclic clusters [Mn(hfac)$\text{}_{2}$NITPh]$\text{}_{6}$ and Ni$\text{}_{12}$(O$\text{}_{2}$CMe)$\text{}_{12}$(chp)$\text{}_{12}$(H$\text{}_{2}$O)$\text{}_{6}$(THF)$\text{}_{6}$. The microscopic parameters of both molecules (J/k$\text{}_{B}$=350±10 K and J/k$\text{}_{B}$=8.5 K±0.5, g=2.23±0.01, respectively) are then obtained from a fit of the theoretical susceptibility curves to the experimental results which are supplemented for Ni$\text{}_{12}$ by new low-temperature measurements.
Źródło:
Acta Physica Polonica A; 2000, 98, 6; 721-727
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulations of Linear S=1 Ferro- and Antiferromagnets
Autorzy:
Kamieniarz, G.
Matysiak, R.
Caramico D'Auria, A.
Esposito, F.
Esposito, U.
Powiązania:
https://bibliotekanauki.pl/articles/1964696.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.-i
75.10.Hk
75.40.Mg
Opis:
The finite-temperature static properties of the spin S=1 antiferromagnetic Heisenberg chains are extensively simulated using the quantum transfer matrix method. The zero-field susceptibility and specific heat as well as the field-dependent magnetization data are evaluated to select the microscopic parameters of a number of real quasi-one-dimensional compounds and to verify some theoretical approaches.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 387-389
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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