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Wyświetlanie 1-15 z 167
Tytuł:
Microbial contamination of money sorting facilities
Autorzy:
Górny, R.L.
Gołofit-Szymczak, M.
Wójcik-Fatla, A.
Cyprowski, M.
Stobnicka-Kupiec, A.
Ławniczek-Wałczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/28762870.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 1; 61-71
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of He-Ne laser irradiation and cadmium and lead on changes in cell cycles at Zea mays L.
Wpływ napromieniowania laserem He-Ne oraz kadmu i ołowiu na zmiany w cyklach komórkowych Zea mays L.
Autorzy:
Różanowski, B.
Możdżeń, K.
Wójcik, J.
Nosalski, R.
Zandi, P.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/13097786.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Zea mays
cell cycle
helium-neon laser
mitotic index
plant
photobiomodulation
trace element
cadmium
lead
Źródło:
Agronomy Science; 2020, 75, 1; 75-83
2544-4476
2544-798X
Pojawia się w:
Agronomy Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie wielkości użytkowania rębnego drzewostanów w zależności od przyjętych metod prognozowania rozwoju lasu
Modelling of the size of allowable cutting based on adopted methods of forest development forecast
Autorzy:
Szyc, K.
Borecki, T.
Stępień, E.
Kędziora, W.
Konieczny, A.
Orzechowski, M.
Wójcik, R.
Powiązania:
https://bibliotekanauki.pl/articles/979061.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
forestry use
forest development
modelling of usage regulation
Opis:
Many attempts have been made to develop a strategy for regulating forest use consistent with the multifunctional forest model. In this paper we present two proprietary methodologies of regulation of the allowable cutting size in a multifunctional forest in the 60−year time perspective. We assumed that all restrictions of nature protection and non−productive functions of the forest would still be in force. We based the first method on age class tables (TKW), which is faster but less exact in terms of spatial order of felling. The tree stand method (D−STAN) is based on stands spatial order and the cutting direction basis. In both cases, we based the temporal felling order on species rotation age. Comparing the results, we noticed that they present similar trends in the age structure of tree stands in younger age classes. The main discrepancies of the forecast concerns the share of forest stands in a complex structure: the TKW method gave approximately 12,4%, while the D−STAN one produced 5,1%. The latter approach shows that much smaller areas of stands are used for reconstruction. That marker is influenced by the spatial order of cutting used in the D−STAN model. In conclusion, we suggest to return to the big−area clear−cutting system on fresh coniferous habitats. Medium−area clear−cuttings should be brought back on the least fertile fresh mixed coniferous forests and possibly even fresh mixed deciduous forests.
Źródło:
Sylwan; 2020, 164, 04; 280-291
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Use of the Loud Platform in the Work of the Scientific and Educational Cluster
Autorzy:
Temirbekov, Nurlan M.
Takabayev, Tahir M.
Baigereyev, Dossan R.
Wójcik, Waldemar
Gromaszek, Konrad
Temirbekov, Almas N.
Omirzhanova, Bakytzhan B.
Powiązania:
https://bibliotekanauki.pl/articles/1844458.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
IT infrastructure
cloud solutions
data center
server
Opis:
The process of designing and creating an integrated distributed information system for storing digitized works of scientists of research institutes of the Almaty academic city is analyzed. The requirements for the storage of digital objects are defined; a comparative analysis of the open source software used for these purposes is carried out. The system fully provides the necessary computing resources for ongoing research and educational processes, simplifying the prospect of its further development, and allows to build an advanced IT infrastructure for managing intellectual capital, an electronic library that is intended to store all books and scientific works of the Kazakhstan Engineering Technological University and research institutes of the Almaty academic city.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 629-634
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie składu chemicznego kory szybko rosnącej topoli z korą innych gatunków drzew liściastych
Comparison of chemical composition of bark of fast−growing poplar with bark of other deciduous tree species
Autorzy:
Krutul, D.
Antczak, A.
Radomski, A.
Wójcik, R.
Drożdżek, M.
Zawadzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/978916.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
bark
mineral substances
extractives
cellulose
lignin
soluble substances in 1% NaOH
Opis:
The aim of the study was to compare the content of some chemical substances in a bark of about 3−year−old fast−growing poplars Populus deltoides × maximowiczii and Populus trichocarpa with literature data on the chemical composition of a bark of older deciduous trees. The Populus deltoides × maximowiczii and Populus trichocarpa material were obtained from the Wolica experimental field belonging to the Institute of Biology, Department of Genetics, Plant Breeding and Biotechnology at Warsaw University of Life Sciences. Using the standard laboratory procedures, the chemical composition of the bark was examined, i.e. the content of extractives and mineral substances, cellulose, lignin and the content of soluble substances in 1% NaOH. The cellulose content in the bark of the 3−year−old poplars tested was higher by from 10 to 23% in relation to its content in the bark of older trees. Whereas, the content of lignin in the bark of the 3−year−old poplars was lower by from 10 to 20% compared to its content in the bark of other older trees. It was found that based on the data obtained, it is difficult to clearly determine which of the generally accepted factors affect the content of mineral substances and substances soluble in 1% NaOH in the bark. However, the content of extractives soluble in a mixture of ethanol and benzene (1:1) w/w, chloroform and ethanol (93:7) w/w as well as cellulose and lignin in the bark depends on the species, age, habitat conditions of the trees and the height of the trunk from which the samples were collected.
Źródło:
Sylwan; 2020, 164, 09
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential sources of infection with selected zoonotic agents in the veterinary work environment - pilot studies
Autorzy:
Wójcik-Fatla, A.
Sroka, J.
Zając, V.
Sawczyn-Domańska, A.
Kloc, A.
Zwoliński, J.
Kłapeć, T.
Studzińska, M.B.
Chmura, R.
Dutkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2085448.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
environment
Coxiella burnetii
Toxoplasma gondii
veterinarians
Leptospira spp
Cryptosporidium spp
Giardia duodenalis
Opis:
Introduction and Objective. The problem of occupational biohazards is very important, especially in the field of agriculture and in human and veterinary medicine. The aim of the study was to determine the potential sources of infection in veterinary professionals with selected zoonotic agents, including: Toxoplasma gondii, Giardia duodenalis, Leptospira spp., Cryptosporidium spp. and Coxiella burnetii. Materials and Method. A total of 50 air samples from barns, piggeries and veterinary surgeries were examined for the presence of Leptospira spp. and C. burnetii DNA. Serum samples of 86 pigs and 80 cows were tested for the presence of antibodies to Leptospira spp. and to phase I and II C. burnetii antigens. Serum of 70 cats were tested for the presence of antibodies to T. gondii and 65 samples of cat faeces for the presence of T. gondii oocysts. The presence of G. duodenalis and Cryptosporidium spp. were examined in 50 of dog faeces and 50 of bovine faeces samples. Results. DNA of Leptospira spp. was detected in 2 air samples from the piggeries (4%). C. burnetii DNA was not found in any sample. Anti-Leptospira spp. antibodies were detected in 51 (59.3%) of examined pigs. Neither anti-Leptospira spp. nor anti-C. burnetii antibodies were found among samples of bovine serum. Anti-T. gondii antibodies was found in 52 cat serum samples (74.3%). Among samples of cat faeces, no T. gondii oocysts were detected. In one sample of cattle stool (2%), G. duodenalis was detected and in another (2%) – Cryptosporidium spp. G. duodenalis was detected in 7 samples (14%) and Cryptosporidium spp. in 2 samples (2%) of dog faeces. Conclusions. The results of this study demonstrate the potential risk of infection with Leptospira spp. in veterinarians working with pigs. Veterinarians could be also be at risk of infection with T. gondii and G. duodenalis.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 146-150
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propozycja wielkoobszarowej metody inwentaryzacji jemioły
Proposition of a large-scale mistletoe inventory method
Autorzy:
Kędziora, W.
Bobińska, A.
Wójcik, R.
Powiązania:
https://bibliotekanauki.pl/articles/979313.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
assessment methods
mistletoe rating system
broom volume score
Viscum
Opis:
Mistletoe (Viscum album L.) is a semi−parasitic plant and, as long as it is not present in large quantities, it does not pose a lethal threat to trees. Due to its ability to carry out photosynthesis, its effect on the host is negligible. However, recent droughts have made heavy impact on forests and mistletoe in recent years began to appear on a larger scale in regions and in places where it has never been a threat before. For this reason, there is an urgent need to broaden our knowledge about this species. This work includes a review of the literature on the biology and ecology of mistletoe. The main purpose of this research is to analyze the methods for assessing the number of mistletoe on individual trees and in the stands as well as to prepare new method adapted to Polish conditions. New method that was proposed is based on random sample plots, each consisting of 15 trees on which impact of mistletoe is assessed. On every sample plot the mistletoe occurrence, location in the crown, estimate of the percentage within the crown and the number of mistletoe on a tree is assessed. In addition, for further analysis, information on stand (forest habitat type, site index) as well as measured trees (age, diameter, Kraft class, crown length, loss of assimilation apparatus, crown type) levels is recorded.
Źródło:
Sylwan; 2020, 164, 07; 568-575
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TEACHING ENGLISH AS A FOREIGN LANGUAGE: A CASE STUDY FROM POLAND
Autorzy:
ROMANIUK, JAROSLAW R.
MILLER, KRISTIN
PIESKI, MARY KAY
WOJCIK, TERESA G.
FARKAS, KATHLEEN J.
Powiązania:
https://bibliotekanauki.pl/articles/1036099.pdf
Data publikacji:
2020-12-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Teaching English
immersion language
language program history
Polish-United States exchange
Opis:
This article presents a detailed history of the development of a particular immersion program to teach English to young Polish students. The program draws support from two organizations, the Kościuszko Foundation and the Polish Scouting Organization. Kościuszko Foundation is dedicated to strengthening the ties between the United States and Poland as well as to increase knowledge of Poland’s history and culture in the United States. The cooperation of these two organizations developed an experience of immersion in language and cultural exchange. Both the teachers and the students in this program benefited from the opportunity to engage in a number of different types of language activities and cultural events through a summer camp experience. This program is, of course, unique, but the elements of context, culture and immersion could be used in other programs to develop English skills and knowledge in the context American culture.
Źródło:
Society Register; 2020, 4, 4; 167-182
2544-5502
Pojawia się w:
Society Register
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury i wilgotności powietrza w stajni na podstawowe parametry fizjologiczne koni
Effect of air temperature and humidity in a stable on basic physiological parameters in horses
Autorzy:
Janczarek, I.
Wilk, I.
Wisniewska, A.
Kusy, R.
Cikacz, K.
Fratczak, M.
Wojcik, P.
Powiązania:
https://bibliotekanauki.pl/articles/2119680.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Zootechniczne
Tematy:
onie
stajnia
parametry powietrza
parametry fizjologiczne
Opis:
Celem pracy była analiza wybranych parametrów technicznych powietrza w stajni (mikroklimat) i podstawowych parametrów fizjologicznych koni utrzymywanych w tej stajni w różnych porach roku. Materiał badawczy stanowiło 12 dorosłych koni gorącokrwistych utrzymywanych w murowanej stajni boksowej. Parametry techniczne powietrza w stajni (temperatura na korytarzu, temperatura w boksie w dwóch punktach, wilgotność względna na korytarzu, wilgotność względna w boksie w dwóch punktach) określono w pierwszym dniu kalendarzowego lata, jesieni, zimy i wiosny tego samego roku. Pomiary za pomocą LB-518 – bezprzewodowego termohigrometru bateryjnego Bluetooth BLE-LOGGER były przeprowadzone o godzinie 12.00 w pięciu punktach stajni oddalonych od siebie o 300 cm. Pomiary parametrów fizjologicznych koni, czyli temperatury wewnętrznej ciała (termometr weterynaryjny Veterinär – Thermometer S.C. 12), częstości rytmu serca (mierniki Polar ELECTRO OY - RS800CX z programem PolarProTrainer 5.0.), częstości oddechów (stoper ręczny) przeprowadzono o godzinie 6.00 i 18.00 w każdym dniu badań. Stwierdzono, że pora roku wywiera znaczący wpływ na kształtowanie mikroklimatu stajennego. Ze względu na utrzymanie optymalnego poziomu wilgotności względnej powietrza, jedynie zimą i okresowo jesienią powinno się ograniczać przewietrzanie stajni. Warto również podkreślić, że mikroklimat stajni wyraźnie oddziałuje na podstawowe parametry fizjologiczne koni. Wysoka temperatura i wilgotność względna powietrza stajni może spowodować niekorzystne zmiany w postaci wieczornego wzrostu temperatury wewnętrznej ciała koni w porze letniej i spadku w porze zimowej. Pozostałe parametry, czyli częstość rytmu serca i liczba oddechów może wówczas również niekorzystnie wzrosnąć, głównie w okresie letnim. Zimą, konie powinny mieć mniej problemów z utrzymaniem prawidłowego poziomu parametrów fizjologicznych, jeszcze mniej jesienią, a najmniej wiosną.
Źródło:
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego; 2020, 16, 3; 55-65
1733-7305
Pojawia się w:
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza identyfikacyjna niestabilnych przedsięwzięć budowlanych
Identification analysis of unstable construction projects
Autorzy:
Kasprowicz, T.
Wojcik, R.R.
Powiązania:
https://bibliotekanauki.pl/articles/887480.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2019, 28, 2[84]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drzewostany przejęte z Państwowego Funduszu Ziemi – stan i problemy zagospodarowania
Forest stands acquired from the State Land Fund – the condition and management problems
Autorzy:
Kędziora, W.
Orzechowski, M.
Wójcik, R.
Wrzosek, E.
Borecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/985718.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy prywatne
grunty lesne
przejmowanie gruntow
zagospodarowanie lasu
fragmentacja lasu
Nadlesnictwo Siedlce
Panstwowy Fundusz Ziemi
private forests
land transfer
forest fragmentation
Opis:
In this paper, we present problems with the management of the forests acquired by the State Forests from the State Land Fund. This was particularly an issue in forest districts with a significant share of private forests, e.g. eastern part of Poland. The problem becomes more and more valid because of the latest amendment of the Forest Act in 2016. It gives the State Forests the right of the first purchase of private forests attributed to sale. They may receive forest stands that will generate specific economic problems related to care, conservation, felling maintenance, etc. These are mostly stands with typical features of private forests, resulting from abandoning economic operations, selective acquisition, as well as from the size, shape and neighbourhood of the plots. This study presents the characteristics of almost 2,000 tree stands acquired from the State Land Fund between 1992−2016 by the Siedlce Forest District (SFD), which is a part of the Regional Directorate of the State Forests in Warsaw. SFD has low forest cover (18%), a strong fragmentation of forest complexes and a very large share of private forests (over 75%). The analysis was based primarily on the descriptions of forest stands and the quantitative and qualitative characteristics, presenting at the same time the problems that SFD has with conducting rational forest management in acquired plots. The current status of the forests transferred from the State Land Fund was assessed as unsatisfactory. The main problems in local conditions are: (i) inadequate fixation in acquired parcels next to private forests (difficulty in locating treatments and custody over the State property), (ii) depleted tree stands, (iii) inadequate parcels (too narrow) and (iv) complications related to co−ownership of parts seized plots. The need to carry out joint−assembly works (mainly land consolidation) or to introduce land communities that would facilitate the management of these forests was demonstrated.
Źródło:
Sylwan; 2019, 163, 08; 665-674
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Freeze-dried elderberry and chokeberry as natural colorants for gluten-free wafer sheets
Autorzy:
Różyło, R.
Wójcik, M.
Dziki, D.
Biernacka, B.
Cacak-Pietrzak, G.
Gawłowski, S.
Zdybel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082495.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
natural colorant
elderberry
chokeberry
gluten-
free
wafer
Opis:
Freeze-dried elderberry and chokeberry were proposed as natural colorants for gluten-free wafers. In addition to colour, other physical and sensorial properties of wafer sheets were also evaluated. The elderberry powder was significantly darker (L* equal 37.61) than the chokeberry powder (L* equal 41.01), and it was characterized by a considerably lower a* value (4.21 in comparison with 12.32). These powdered fruits were added in the range from 0 to 5 %. A new indicator of wafer batter delamination was developed, which can also be proposed for other liquids. Significant and favourable changes were noted in the colour of both batter and wafers, with an increased content of fruits from 1 to 5%. Gluten-free wafers with a 5% addition of fruits were characterized by L*, a*, b* values, respectively, equalling 35.73, 6.05 and 3.24 for elderberry, and 39.74, 7.15 and 5.05 for chokeberry. Wafers with a 5% addition of chokeberry and elderberry, in comparison to control wafers, had significantly higher contents of minerals, including iron, potassium, calcium, magnesium and sodium. The freeze-dried elderberry powder, as compared to the chokeberry powder, was found to significantly increase the content of these minerals. In addition, the total flavonoids content was higher in the wafers containing elderberry. Freeze-dried chokeberry and elderberry can be proposed as natural colorants and valuable functional components for wafers.
Źródło:
International Agrophysics; 2019, 33, 2; 217-225
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Missions of the Helicopter Emergency Medical Service in rural and urban areas in Poland - a comparative retrospective analysis
Autorzy:
Rzońca, P.
Gałązkowski, R.
Wójcik-Fatla, A.
Panasiuk, L.
Gotlib, J.
Powiązania:
https://bibliotekanauki.pl/articles/2083142.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
Helicopter Emergency Medical Service
rural and urban areas
prehospital care
Opis:
Introduction. Mortality due to various causes, despite continuous efforts to improve the quality of medical services, is a serious problem for modern healthcare systems. Ischaemic heart disease and stroke are the cause of over 15 million deaths annually, and are therefore known as the world’s number one killer. Objective. The aim of this study is to characterise the missions and the most common reasons for dispatching Helicopter Emergency Medical Service (HEMS) crews, with special emphasis on the differences between urban and rural areas. Materials and method. The study was conducted using a retrospective analysis of HEMS missions, including flights to accidents and diseases carried out by HEMS crews in Poland from January 2014 – December 2018. The final analysis included 35,213 cases of HEMS missions. Results. The study group consisted mainly of male patients (66.40%), aged 50–64 (22.06%), mean age of the entire analysed group – 47.71 (SD: 25.96). The main reason for HEMS missions were strokes (21.63%). Analysis of patients’ clinical status revealed that the clinical status of patients treated in rural areas was more severe, which was indicated by the Glasgow Coma Scale – GCS (12.03 vs 12.35) and the Revised Trauma Scale – RTS (10.14 vs 10.60) scores. When assessed by the National Advisory Committee for Aeronautics (NACA) score, body injuries and fatal diseases were observed more often in patients in rural areas (NACA 7 6.12% vs 3.46%) (p<0.05). Conclusions. Multi-organ injuries, head traumas, sudden cardiac arrest, traumatic brain injuries, collapse and epilepsy, were more frequent reasons for HEMS missions in rural areas than in urban areas.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 355-360
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regionalne zróżnicowanie potrzeb i pilności przebudowy drzewostanów
Regional diversity of the need and the urgency of stands conversion
Autorzy:
Stępień, E.
Kędziora, W.
Orzechowski, M.
Wójcik, R.
Borecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/985680.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany
przebudowa drzewostanow
potrzeby przebudowy
zroznicowanie regionalne
regionalne dyrekcje Lasow Panstwowych
stand classification
regional heterogeneity
conversion necessity
state forests
Opis:
Nowadays in forestry, we observe an increase in threats that rise the uncertainty and risk of the forest management. This is caused, inter alia, by increasing intensity of forest and environmental damage as well as by the conflict of expectations for the use of forest resources. As a result, there is a problem of achieving the goals of sustainable development and adaptation of the forest ecosystems to new challenges. The aim of the presented study was to assess the regional variety of the need and the urgency of stands conversion. The feature was determined for all stands of the State Forests older than 20 years. Three assessment criteria were selected: (A) silvicultural target (compatibility of the species composition with the planned one), (B) stands stability (resultant from 5 auxiliary sub−indices), and (C) stock level (including 2 auxiliary sub−indices). The majority of stands has consistent species composition (over 60% in total), however only a small fraction of stands was found with a species composition incompatible with the planned one (average 6.34%). Stands with medium stability accounted for about 70%, while those with poor growing stock status make up about 70% of stands under analysis. The regional diversification of the needs for stands reconstruction seems to be strongly correlated with the incompatibility of stand’s species composition with habitat conditions. The largest fraction of stands requiring conversion was observed in Wrocław, Kraków and Katowice regional directorates of the State Forests. This situation may change in the future due to dynamic changes resulting from modifications of the climate and the deterioration of health condition of dominant Scots pine stands in central and north parts of Poland. Private forests were not taken into consideration in this research. It may impact the overall picture in regions of the high share of private forest ownership.
Źródło:
Sylwan; 2019, 163, 04; 267-278
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface roughness of the Ti-6Al-4V ELI titanium alloy after the turning process
Autorzy:
Rosik, R.
Kępczak, N.
Sikora, M.
Witkowski, B.
Wójcik, R.
Midera, S.
Powiązania:
https://bibliotekanauki.pl/articles/379242.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
statistic methods
titanium alloy
surface roughness
turning
metody statystyczne
stop tytanu
chropowatość powierzchni
toczenie
Opis:
Purpose: The purpose of this article is discussing the methods of determining the surface roughness of the Ti-6Al-4V ELI titanium alloy obtained after longitudinal turning. The method of determining the mathematical model used for determining the Rz roughness parameter and then the results obtained were compared with values measured and calculated on the basis of equations available in the literature. Design/methodology/approach: The mathematical model in the form of multiple regression function of exponential polynomial was determined using the algorithm of the acceptance and rejection method. The data for calculations was obtained by measuring the surface roughness after turning with different machining parameter values. Findings: A mathematical model was elaborated in the form of a multiple regression function, enabling calculation of the Rz parameter describing the Ti-6Al-4V ELI titanium alloy surface roughness after longitudinal turning. The verification of the dependence obtained confirmed its accuracy. Research limitations/implications: Further research should encompass other values of machining plate geometry, as well as other types of cooling and lubricating fluids and method of applying them. Practical implications: The mathematical model can be helpful when choosing the conditions in which the turning process will be carried out. It also constitutes a basis for further optimisation of that process. Originality/value: The results of this research are a novelty on a worldwide scale. No research of this type has been conducted with regard to analyses and optimisation of longitudinal turning of the Ti-6Al-4V ELI titanium alloy.
Źródło:
Archives of Materials Science and Engineering; 2019, 98, 2; 74-80
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 167

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