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Tytuł:
Flora of fallow lands of the Podlaski Przelom Bugu mesoregion
Flora odlogow Podlaskiego Przelomu Bugu
Autorzy:
Skrzyczynska, J
Stachowicz, P
Powiązania:
https://bibliotekanauki.pl/articles/27285.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
systematics
species list
locality list
fallow land zob.fallow
fallow
multiaspect analysis
flora
Podlaski Przelom Bugu mesoregion
Opis:
Studies on flora of fallow lands of the Podlaski Przełom Bugu mesoregion were carried out between 2001 and 2003 in the area of 77 localities, situated in 20 communes. A systematic list of fallow land flora was made and its variation with respect to occurrence frequency, biological spectrum, persistence and belonging to geographic-historical and sociological-ecological groups was analyzed. Flora of fallow lands of the Podlaski Przełom Bugu mesoregion includes 442 species included in 60 families and 241 botanical genera. The most numerous group comprises very rare, rare and quite frequent species. In the floristic composition of the analysed flora, apophytes (72.2%) predominate over anthropophytes (2.8%) as well as perennials (61%) over ephemerals (39%). Considering the biological spectrum of flora, hemicryptophytes (49%) and terophytes (32%) predominate over other life forms. Forest and shrub species (18.5%) as well as meadow (17%) and xerothermic sward plants (17.4%) have the largest share in the flora. The abundant occurrence of segetal (15.8%) and long-lived ruderal communities (8.1%) was also noted. Moreover, the occurrence of 25 species endangered with extinction in fallow land communities of the Południowopodlaska Lowland was noted. They are as follows: Nigella arvensis, Potentilla recta, Platanthera chlorantha, Agrostemma githago, Prunella grandiflora, Populus alba, Silene tatarica, Papaver argemone, Papaver rhoeas, Veronica polita, Hieracium floribundum, Bromus secalinus, Polygonum bistorta, Geum alleppicu, Astragalus arenarius, Centaurium erythraea, Veronica agrestis, Veronica verna, Cirsium rivulare. Allium oleraceum, Hierochloë odorata, Chenopodium polyspermum, Vinca minor, Dipsacus silvestris and Campanula latifolia.
Badania flory odłogów Podlaskiego Przełomu Bugu przeprowadzono w latach 2001-2003 na terenie 77 miejscowości położonych w 20 gminach. W pracy przedstawiono systematyczny wykaz gatunków flory odłogów tego terenu oraz jej zróżnicowanie pod względem częstości występowania, spektrum biologicznego, trwałości oraz przynależności do grup geograficzno-historycznych i socjologiczno-ekologicznych. Zinwentaryzowana flora odłogów Podlaskiego Przełomu Bugu liczy 442 gatunków, należących do 60 rodzin i 241 rodzajów botanicznych. Najliczniejszą grupę stanowią gatunki bardzo rzadkie, rzadkie i dość częste. W analizowanej florze przeważają apofity (72,2%) nad antropofitami (27,8%) oraz gatunki wieloletnie (61%) nad krótkotrwałymi (39%). W spektrum biologicznym flory dominują hemikryptofity (49%) i terofity (32%) nad innymi formami życiowymi. Największy ilościowy udział w grupach socjologiczno-ekologicznych mają gatunki leśne i zaroślowe (18,5%), łąkowe (17%) oraz muraw ciepłolubnych (17,4%). Licznie występują również gatunki segetalne (15,8%) i trwałych zbiorowisk ruderalnych (8,1%). W zbiorowiskach odłogów występuje 25 gatunków zagrożonych wyginięciem na Nizinie Południowopodlaskiej. Są to: Nigella arvensis, Potentilla recta, Platanthera chlorantha, Agrostemma githago, Prunella grandiflora, Populus alba, Silene tatarica, Papaver argemone, Papaver rhoeas, Veronica polita, Hieracium floribundum, Bromus secalinus, Polygonum bistorta, Geum alleppicum, Astragalus arenarius, Centaurium erythraea, Veronica agrestis, Veronica verna, Cirsium rivulare, Allium oleraceum, Hierochloë odorata, Chenopodium polyspermum, Vinca minor, Dipsacus silvestris, Campanula latifolia.
Źródło:
Acta Agrobotanica; 2007, 60, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Avena strigosa Schreb. w agrocenozach Podlaskiego Przełomu Bugu
Avena strigosa Schreb. in agrocoenoses of the Podlaski Przelom Bugu mesoregion
Autorzy:
Skrzyczynska, J.
Rzymowska, Z.
Stachowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/27248.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
The research on the localities of Avena strigosa and on its increased occurrence in agricultural crops of the Podlaski Przełom Bugu was carried out in 1994-1998. The documentation of this research consists of 600 phytosociological relevés and the floristic records. The paper presents the composition and structure of the field plant communities where Avena strigosa was found. It occurs frequently on various soil types of the Podlaski Przełom Bugu. However, on the area examined it was found just in small numbers, covering up to 5% of the area, while in the eastern part of the area an increase in its occurrence was observed. In the area of the Podlaski Przełom Bugu Avena strigosa occurred in spring cereals in the communities of Arnoserido-Scleranthetum and Vicietum tetraspermae as well as in the poor field communities, with the character species of Aperion spicae-venti and Panico-Setarion. Additionally, Avena strigosa was also found in the field communities of root crops belonging to Panico-Setarion alliance; however, it was present there just in small numbers.
Badania rozmieszczenia i nasilenia występowania Avena strigosa w uprawach rolniczych Podlaskiego Przełomu Bugu przeprowadzono w latach 1994-1998. Dokumentację stanowi 600 zdjęć fitosocjologicznych i spisy florystyczne. Opracowanie prezentuje także skład i strukturę zbiorowisk z udziałem Avena strigosa. Avena strigosa na terenie Podlaskiego Przełomu Bugu występuje często, na różnych typach i gatunkach gleb. Pokrycie jego jest niewielkie, w większości płatów nie przekracza 5%. Lokalnie większe nasilenie występowania Avena strigosa stwierdzono we wschodniej części badanego terenu. Na terenie Podlaskiego Przełomu Bugu Avena strigosa występował w uprawach zbóż jarych w płatach Arnoserido-Scleranthetum i Vicietum tetraspermae oraz w płatach zbiorowisk zubożałych z udziałem gatunków charakterystycznych Aperion spicae-venti i Panico-Setarion. Avena strigosa stwierdzono również w zbiorowiskach okopowych należących do związku Panico-Setarion. W zbiorowiskach tych spotykano go rzadko, w niewielkiej liczbie egzemplarzy.
Źródło:
Acta Agrobotanica; 2005, 58, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Floristic variation in communities of fallow lands of the Podlaski Przełom Bugu mesoregion depending on the time of removal of fields from cultivation
Zróżnicowanie florystyczne zbiorowisk odłogów Podlaskiego Przełomu Bugu w zależności od czasu wyłączenia pól z uprawy
Autorzy:
Skrzyczynska, J.
Stachowicz, P.
Rzymowska, Z.
Skrajna, T.
Powiązania:
https://bibliotekanauki.pl/articles/27750.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
A study of fallow lands in the Podlaski Przełom Bugu (Podlasie Bug River Gorge) mesoregion was conducted over the period 2001–2004 in 77 villages belonging to 20 municipalities located in the Bug River valley along the stretch of the river from Terespol to Małkinia Górna. The aim of this study was to carry out a survey of vascular plants in fallow lands and to perform their multifaceted analysis. The study investigated quantitative and qualitative changes taking place in fallow vegetation with the passage of time from the abandonment of purposeful cultivation. Plant patches in 1–2-year, 3–6-year, 7–10-year and more than 10-year fallows were studied. Vascular plants of fallow lands within the study area comprise 442 species. 3–6-year fallows were richest in species (355). With increasing fallow age, the number of species decreased to 205 species in fallows older than 10 years. Hemicryptophytes dominated in plant communities of fallow lands. Therophytes were the co-dominant biological type in the youngest fallows. Chamaephytes and geophytes in all fellow age groups accounted for about 5%. Among vascular plants of fallow lands, native species dominated and their percentage increased with increasing fallow age, while at the same time the proportion of archeophytes decreased. With the increasing age of fallows, the proportion of species characteristic of forest communities also increased, whereas the percentage of segetal species simultaneously decreased. With the passage of time from the abandonment of cultivation, one can observe the evolution of plant cover of fallow fields from segetal communities towards less synanthropic communities.
Badania odłogów Podlaskiego Przełomu Bugu przeprowadzono w latach 2001–2004 w 77 miejscowościach należących do 20 gmin położonych w dolinie Bugu na odcinku rzeki od Terespola do Małkini Górnej. Celem badań była inwentaryzacja roślin naczyniowych terenów odłogowanych i ich wieloaspektowa analiza. Określono zmiany ilościowe i jakościowe zachodzące w roślinności odłogów z upływem czasu od zaprzestania celowych zabiegów uprawowych. Zbadano płaty roślinne odłogów 1–2 letnich, 3–6 letnich, 7–10 letnich i powyżej 10 letnich. Rośliny naczyniowe odłogów terenu badań liczą 442 gatunki. Najbogatsze w gatunki były odłogi 3–6 letnie (355 gatunków). Wraz z wiekiem odłogów liczebność gatunków malała do 205 gatunków na odłogach powyżej 10-letnich. W zbiorowiskach odłogów dominowały hemikryptofity. Na najmłodszych odłogach współdominującym typem biologicznym były terofity. Chamefity i geofity wszystkich grup wiekowych odłogów stanowiły około 5%. Wśród roślin naczyniowych odłogów dominowały gatunki rodzime, których udział wzrastał z wiekiem odłogów, jednocześnie zmniejszał się udział archeofitów. Wraz z wiekiem odłogów wzrasta także udział gatunków charakterystycznych dla zbiorowisk leśnych, równocześnie malał udział gatunków segetalnych. Wraz z upływem czasu od zaprzestania uprawy widoczne jest ewoluowanie szaty roślinnej odłogów od zbiorowisk segetalnych w kierunku zbiorowisk mniej zsynantropizowanych.
Źródło:
Acta Agrobotanica; 2014, 67, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ sposobu nagrzewania i grubości rdzeni pomiarowych wykonanych z oliwinowych mas formierskich z krzemianem sodu na odkształcalność badaną na urządzeniu DMA Hot-Distortion
The influence of heating method and the thickness of measuring cores made of olivine moulding sands with sodium silicate on the deformation tested with a DMA Hot-Distortion device
Autorzy:
Stachowicz, M.
Paduchowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/391413.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
odlewnictwo
oliwinowa masa formierska
uwodniony krzemian sodu
odkształcenie plastyczne
nagrzewanie mikrofalowe
foundry engineering
olivine moulding sand
hydrated sodium silicate
thermal deformation
microwave heating
Opis:
W artykule podjęto tematykę wpływu podwyższonej temperatury na oliwinowe masy formierskie i rdzeniowe ze spoiwem nieorganicznym z grupy niemodyfikowanych gatunków uwodnionego krzemianu sodu. Sporządzone w warunkach laboratoryjnych masy na osnowie piasku oliwinowego formowano w kształtki prostopadłościenne do badania przemieszczenia wolnego końca rdzenia pomiarowego w warunkach otoczenia o podwyższonej temperaturze. W celu utwardzenia, wykonane z mas oliwinowych, kształtki poddawano szybkiemu nagrzewaniu mikrofalowemu w piecu z generatorem częstotliwości fali elektromagnetycznej f = 2,45 GHz i mocy wyjściowej 1000 W, w czasie 180 s. Badania przeprowadzono na kształtkach prostopadłościennych formowanych we wnęce o wymiarach: 25,9 × G × 120,4 mm, gdzie G = 6 lub 8, lub 10 mm. Pomiary przemieszczeń wolnego końca kształtek rdzeni pomiarowych przeprowadzono na zautomatyzowanym urządzeniu laboratoryjnym DMA Hot- Distortion. W trakcie pomiarów zastosowano trzy sposoby ogrzewania powierzchni prostopadłościennych kształtek spotykanych w technice pomiarowej odkształceń H-D (Hot Distortion Test): grzanie od dołu, grzanie od dołu i od góry (Modified Hot Distortion Test) oraz ogrzewanie tylko od góry. Przemieszczenie wolnego końca kształtek prostopadłościennych, w zależności od grubości oraz sposobów ogrzewania ich powierzchni, posłużyło do wstępnej oceny zachowania utwardzonych mikrofalowo mas oliwinowych z krzemianem sodu w warunkach otoczenia o podwyższonej temperaturze.
The article raises the issue of the influence of increased temperature on olivine moulding and core sands with an inorganic binder from the group of unmodified kinds of hydrated sodium silicates. Produced at laboratory conditions, moulding sands with an olivine sand matrix were formed into cuboidal specimens to test the deformation of the free measuring core end at conditions of increased temperature. In order to harden, the measuring cores made of olivine moulding sands fast microwave heating was applied to which used was a furnace with an electromagnetic wave frequency generator f = 2.45 GHz and output power of 1000 W, in the time period of 180 s. Tests were carried out on cuboidal specimens moulded in a cavity with the dimensions 25.9 × G × 120.4 mm, where G = 6 or 8 , or 10 mm. Measurements of deformation of the free specimen end of the measuring cores were conducted on an automated laboratory DMA Hot-Distortion apparatus. During the measurements three techniques were used to heat the surfaces of cuboidal specimens which are applied in the Hot Distortion Test: heating from the bottom, heating from the bottom and the top (Modified Hot Distortion Test), and heating only from the top. The deformation of the free end of cuboidal specimens, depending on the thickness and heating techniques of their surfaces, served for the initial assessment of the behaviour of microwave hardened olivine moulding sands with sodium silicate at conditions of increased temperature.
Źródło:
Prace Instytutu Odlewnictwa; 2018, 58, 4; 277-293
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Good practice in construction of flexible soil-steel structures. Well done installations of buried bridges
Autorzy:
Tomala, P.
Stachowicz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/383572.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
buried structure
water protect
support
drainage
animal overpass
Opis:
The following article raises questions on good practices that should accompany both the design and installation process of corrugated soil-steel bridges. Solutions for crucial elements of soil-steel structures developed over the years of experience and observations are put forward. The authors put special emphasis on issues related to the flexible soil-steel structures protection against water and point to new developments in the waterproof design area. The paper presents examples of properly executed civil engineering facilities, which indicated further development directions. The authors wish to draw attention to the fact that with the popularization of corrugated steel plate bridges the necessity of dissemination of correct and reliable solutions among designers and contractors increases. They provide a guarantee for long and seamless bridge utilization.
Źródło:
Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 269-278
1897-4007
Pojawia się w:
Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability of light-stimulated photoluminescence (PSL) in detection of irradiated food comparison with thermoluminescence method (TL)
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/147688.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
irradiation
detection
food products
spices
herbs
blends
photostimulated luminescence (PPSL)
thermoluminescence (TL)
Opis:
The detection of irradiation of several classes of food products with the use of thermoluminescence (TL) and photostimulated luminescence (PPSL) has been proceeded. The comparison of the results obtained by both methods has been done and reliability of the PPSL method as compared with the TL method evaluated. Conclusion concerning the usefulness of such evaluation to the practice has been drawn.
Źródło:
Nukleonika; 2008, 53, suppl. 1; 25-29
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crevassing of an inland dune during the 1998 flood in upper Vistula river valley (South Poland
Krewasowanie śródlądowej wydmy w dolinie górnej Wisły podczas powodzi w 1998 roku
Autorzy:
Gębica, P.
Stachowicz-Rybka, R.
Powiązania:
https://bibliotekanauki.pl/articles/191361.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
flood
inland dune
crevasse splay
Vistula river valley
Polska
Opis:
A relatively small flood in April 1998 inundated stream valleys draining the Tarnów Plateau. The flood water of one of these streams crevassed a dune. An elongated crevasse, an irregular-shaped transport zone and a crevasse splay were formed as a result. The crevasse splay consisted of several lobes, which were separated by crevasse channels. Minor fans formed at the channel outlets. All this forms were the result of rapid processes of erosion and accumulation. The dominant lithofacies in the crevasse splay sediments were fine and medium sand with horizontal (bottomset) and low-angle (topset) stratification. Trough and planar cross-stratified medium- and coarse-grained sands appear in the middle part of the vertical sequence. Most of these sediments were laid down in a high-energy environment of a sheet flow. The phase of vanishing flow left ripple marks, encountered in the highest part of the distal splay.
Źródło:
Annales Societatis Geologorum Poloniae; 2002, 72, No 2; 191-197
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on radiation-induced radicals giving rise to stable EPR signal suitable for the detection of irradiation in L-sorbose-containing fruits
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/146498.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
sorbose
crystallite
electron paramagnetic resonance (EPR)
EPR
irradiation
Opis:
The stable and complex EPR signals produced by the action of ionizing radiation on crystalline L-sorbose (C6H12O6) separated from rowan berries (Sorbus aucuparia) were studied. Isothermal heating of the samples at the temperature close to the melting point of L-sorbose (140°C) results in the modification and simplification of the EPR signal involved. In the EPR signal of heated L-sorbose, the isotropic quartet was distinguished. In the differential spectrum obtained by subtraction of normalized spectra of unheated and heated L-sorbose, the isotropic doublet was identified in addition. The DFT fitting offers the probable assignment of the EPR signals to specifi c radical structures.
Źródło:
Nukleonika; 2016, 61, 4; 461-465
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on organic radicals giving rise to multicomponent EMR spectra in dried fruits expose to ionizing radiation II. D-Glucose
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/147173.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dried fruits
electron magnetic resonance (EMR)
irradiation
glucose
organic radicals
Opis:
Crystalline D-glucose extracted from dried resins was irradiated with 60Co gamma rays. The multicomponent EMR spectra of the samples kept at ambient temperature were compared with those heated at 105°C – the temperature close to the melting point of glucose. Normalized EMR spectra recorded with both samples were subtracted, resulting in a differential EMR spectrum. Spectral analysis of all three spectra has been done resulting in the identification of isotropic doublet of doublets assigned to less stable radical derived from parent glucose molecule.
Źródło:
Nukleonika; 2013, 58, 3; 425-428
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Possibilities of Sodium Silicate Sands Application in Automated Hot-Box Process of Cores Shooting
Autorzy:
Stachowicz, M.
Granat, K.
Obuchowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/382506.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry technology
sodium silicate
core box
core shooting
bending strength
technologia odlewnicza
krzemian sodu
rdzennica
rdzeń wstrzeliwany
wytrzymałość na zginanie
Opis:
The paper presents the results of preliminary research on the use of silica sands with hydrated sodium silicate 1.5% wt. of binder for the performance of eco-friendly casting cores in hot-box technology. To evaluate the feasibility of high quality casting cores performed by the use of this method, the tests were made with the use of a semiautomatic core shooter using the following operating parameters: initial shooting pressure of 6 bar, shot time 4 s and 2 s, core-box temperature 200, 250 and 300 °C and core heating time 30, 60, 90 and 150 s. Matrixes of the moulding sands were two types of high-silica sand: fine and medium. Moulding sand binder was a commercial, unmodified hydrated sodium silicate having a molar module SiO2/Na2O of 2.5. In one shot of a core-shooter were made three longitudinal samples (cores) with a total volume of about 2.8 dm3. The samples thus obtained were subjected to an assessment of the effect of shooting parameters, i.e. shooting time, temperature and heating time, using the criteria: core-box fill rate, bending strength (RgU), apparent density and surface quality after hardening. The results of the trials on the use of sodium silicate moluding sands made it possible to further refine the conditions of next research into the improvement of inorganic warm-box/hot-box technology aimed at: reduction of heating temperature and shot time. It was found that the performance of the cores depends on the efficiency of the venting system, shooting time, filling level of a shooting chamber and grains of the silica matrix used.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 155-160
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microwave Heating on Moulding Sand Properties with Gypsum Binder
Autorzy:
Paduchowicz, P.
Stachowicz, M.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/382976.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry industry
foundry materials
foundry technology
microwave heating
gypsum
binding material
przemysł odlewniczy
materiały odlewnicze
technologia odlewnicza
ogrzewanie mikrofalowe
gips
materiał wiążący
Opis:
The paper presents results of initial research on the possibility of applying microwave radiation in an innovative process of making casting moulds from silica sand, where gypsum CaSO4∙2H2O was acting as a binding material. In the research were compared strengths and technological properties of moulding mixture subjected to: natural bonding process at ambient temperature or natural curing with additional microwave drying or heating with the use of microwaves immediately after samples were formed. Used in the research moulding sands, in which dry constituents i.e. sand matrix and gypsum were mixed in the ratio: 89/11. On the basis of the results of strength tests which were obtained by various curing methods, beneficial effect of using microwaves at 2.45 GHz for drying up was observed after 1, 2 and 5 hours since moisture sandmix was formed. Applying the microwaves for hardening just after forming the samples guarantees satisfactory results in the obtained mechanical parameters. In addition, it has been noted that, from a technological and economic point of view, drying the silica sand with gypsum binder in microwave field can be an alternative to traditional molding sand technologies.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 97-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Density Degree and Grade of Inorganic Binder on Behavior of Molding Sand at High Temperature
Autorzy:
Stachowicz, M.
Paduchowicz, P.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/106947.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
foundry
hydrated sodium silicate
hot-distortion
thermal deformation
molding sands
Opis:
This paper discusses the impact of high temperatures (up to 900°C) on molding and core sand with inorganic binders selected from among the group of unmodified grades of hydrated sodium silicate (water-glass). Molding sands with medium quartz sand were made under laboratory conditions and compacted at the different energy inputs necessary for obtaining various apparent densities (ϱ0). Due to the different composition and apparent density of molding mixtures hardened via microwaves at a frequency of 2.45 GHz, it was possible to assess their deformation (L) at a high temperature above the binder’s eutectic temperature. For this purpose, an apparatus for hot distortion tests was used whose construction and equipment allows us to measure the thermoplastic deformations in molding sand in many aspects; i.e., in its time of annealing. The article proposes new possibilities of interpreting the hot distortion phenomena in comparative studies of molding materials and mixtures. The application of this new measurement method revealed the differences between molding mixtures made with five inorganic binders with a molar module ranging from 2.0 to 3.4 and apparent density ranging from 1.34 to 1.57 g/cm3. It was established that distortions under the influence of high temperatures last the longest in molding sand with a binder with the highest molar module (3.4). Research also revealed that the density of molding sand is significant for increasing/decreasing the rate of thermoplastic deformations following the heating of samples only if the molding sand includes binders with a molar module of between 3.0 to 3.4. For molding sand with binders with molar modules from 2.0 to 2.5, it was established that this is excessively susceptible to thermoplastic deformation.
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 3; 64-69
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Higher Temperature on Quartz Moulding Sand with Gypsum Binders
Autorzy:
Paduchowicz, P.
Stachowicz, M.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/382554.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
building gypsum
gypsum putty
pH
LOI
odlewnictwo
gips
spoiwo gipsowe
Opis:
This paper presents initial findings from research into the possibility of using gypsum binders in quartz moulding sand that could be used in the production of casting moulds and cores. For the purposes of the research two commercial types of gypsum were used as binders: building gypsum and gypsum putty. Dry components of moulding sand i.e. medium quartz sand and gypsum were mixed in proportion of 89/11 parts by weight. In order to achieve bonding properties for the binders, 5 parts by weight of water was added to the mixture of dry components. After 24 hours of adding water and mixing all the components, the moulding sand, naturally hardened, was subjected to high temperature. The moulding sand thus produced, i.e. with cheap and environmentally-friendly gypsum binders, was eventually analysed after heating (at temperatures of 300oC, 650oC and 950oC) and cooling in order to determine changes in the following parameters: LOI – loss on ignition, chemical composition and pH. Moreover, investigated were bonding bridges, before and after the moulding sand was roasted. The research results revealed differences in the structure of bonding bridges and the occurrence of automatic adhesive destruction for both types of gypsum binders. For two types of moulding sands under the investigation of the LOI exceeded 2.59wt.% (with building gypsum) or 2.84wt.% (with putty gypsum) and pH increased to ca. 12 as a result of increasing roasting temperature from 300oC to 650oC. Next, roasting at 950oC decrease value of LOI in both types of moulding sands. Moulding sand with builoding gypsum roasted at 950oC revealed a return to the value of pH parameter measured prior to annealing.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 81-86
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Źródła zagrożeń strategicznych specyficznych dla przedsiębiorstw innowacyjnych wysokiej technologii
The sources of strategic threats that are specific to high-tech innovative companies
Autorzy:
Stachowicz, J.
Krannich, M.
Kordel, P.
Powiązania:
https://bibliotekanauki.pl/articles/321681.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
innowacje
przedsiębiorczość technologiczna
podejście sieciowe
innovation
entrepreneurship
technology
network approach
Opis:
W artykule zawarto wyniki badań sondażowych, dotyczących zagrożeń dla przedsiębiorstw innowacyjnych wysokich technologii oraz zagrożeń jako sytuacji kryzysowych oraz sformułowano wyjściowe, podstawowe rekomendacje dla doskonalenia zarządzania strategicznego w tych organizacjach. Wnioski i postulaty sformułowano na podstawie badań sondażowych, prowadzonych w trakcie realizacji projektu - grantu badawczego.
The paper contains the results of surveys regarding the risks for innovative companies, high-tech and threats as emergencies and formulated output, basic recommendations for improving the strategic management of these organizations. Conclusions and proposals were formulated on the basis of surveys conducted during the project - a research grant.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2015, 80; 229-237
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR study on sugar radicals utilized for detection of radiation treatment of food
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/146706.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
density functional theory (DFT)
dried fruits
electron paramagnetic resonance (EPR)
irradiation
mannose
sorbose
Opis:
Radicals produced by ionizing radiation in sugars, the components of dried and raw fruits give rise to stable multicomponent electron paramagnetic resonance (EPR) signals unidentified so far. The subject of the present EPR study is to identify the radicals stabilized in gamma-irradiated crystalline sugars, D(+)mannose and L(-)sorbose extracted from cranberries (Vaccininum oxycoccos) and rowan berries (Sorbus aucuparia), respectively. EPR measurements and density functional theory (DFT) simulations were employed for that purpose.
Źródło:
Nukleonika; 2012, 57, 4; 545-549
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on stable radicals produced by ionizing radiation in dried fruits and related sugars by electron paramagnetic resonance spectrometry and photostimulated luminescence method – I. D-fructose
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/147212.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fructose
PPSL
EPR
irradiation
detection
food products
Opis:
Stability of sugar born radicals separated from irradiated Iranian dried raisins and from D-fructose by Sigma Aldrich has been studied at room temperature by EPR and PPSL methods in a period of 360 days. It has been proven for the first time experimentally that the complex EPR spectrum of irradiated sugars is changed in time and after heating. Hence, this made it possible to distinguish spectral lines of two specific radicals contributing to the formation of multicomponent spectra, recorded in both time dependent and heating experiments. The radicals measured by EPR and energy traps detected by PPSL decay at room temperature in a similar way, suggesting a similar distribution of both species in sugar crystallites. We think that our experimental approach might be useful to study interrelation between the formation and trapping of radicals and energy accumulated in crystalline matrices. In order to achieve the isolation of individual sugars from fruits the extraction and specific separation procedures have been adapted with the use of methanol, ethanol and water solvents. Our results clearly show that radicals induced by radiation in fruits (with fructose born radicals as major constituent) are stable enough at room temperature for easy identification of irradiated raisins using the EPR method.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 89-94
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on irradiated D-mannose isolated from cranberry
Autorzy:
Guzik, Grzegorz P.
Stachowicz, Wacław
Michalik, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/147508.pdf
Data publikacji:
2019
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
crystallite
electron paramagnetic resonance
EPR
irradiation
mannose
Opis:
The stable EPR signal produced by ionizing radiation in crystalline D-mannose (C6H12O6) and separated from cranberries (Vaccinium oxycoccus) was studied. The isothermal heating of irradiated sample at 95°C for 10 minutes (melting point of D-mannose is 132°C) resulted in the modifi cation and simplifi cation of the EPR signal involved. The isotropic quartet has been recognized in the EPR signal of heat-treated sample. Molecular structure of the isotropic quartet identifi ed in the complex EPR signal of D-mannose crystallite is proposed.
Źródło:
Nukleonika; 2019, 64, 4; 139-143
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of irradiated dried fruits using EPR spectroscopy
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/148844.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dried fruits
electron paramagnetic resonance (EPR)
fructose
glucose
irradiation
Opis:
The dominating carbohydrates in fruits are monosaccharides like fructose, glucose, sorbose and mannose. In dehydrated fruits, concentration of monosaccharides is higher than in fresh fruits resulting in the formation of sugar crystallites. In most of dried fruits, crystalline fructose, and glucose dominate and appear in proportion near to 1:1. Irradiation of dried fruits stimulates radiation chemical processes resulting in the formation of new chemical products and free radicals giving rise to multicomponent EPR signal which can be detected for a long period of time. For that reason, it is used as a marker for the detection of radiation treatment of dried fruits. It has been found that EPR spectra recorded in dried banana, pineapple, papaya, and fig samples resemble the EPR spectrum obtained by computer addition of fructose and glucose spectra taken in proportion 1:1. The decay of radiation induced EPR signals proceeds in dried fruits fast during the first month of observation and becomes much slower and almost negligible after prolonged storage. However, it remains intense enough for EPR detection even one year after processing. The radiation induced EPR signal is easily detected in dried fruits exposed to 0.5 kGy of gamma rays. Thus, the EPR method of the detection of irradiated fruits can be used for the control of dried fruits undergoing quarantine treatment with 200–300 Gy of ionizing radiation.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 627-631
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reclamation of Polish lignite open pits by flooding
Autorzy:
Szczepiński, J.
Fiszer, J.
Stachowicz, Z.
Szczepanik, P.
Powiązania:
https://bibliotekanauki.pl/articles/2062979.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pit lakes
lignite open pit
hydrogeological conditions
Opis:
This paper presents reclamation of post-mining lignite open pits by flooding in Poland. Besides, it provides some data on hydrogeological conditions of Polish lignite mines. Reclamation by flooding is presently used in post-mining voids in the Adamów Lignite Mine and the Konin Lignite Mine, and it is anticipated to be used in the future, in the case of large-space abandoned open pits in the Turów Lignite Mine and the Bełchatów Lignite Mine, whose volume will exceed one billion cubic meters. Pit lakes in Poland are formed deliberately as a planned part of the after-use of lignite surface mine voids and they are used as wildlife habitats, fisheries, water sports venues or other forms of amenity. In each case the mine voids are flooded by natural groundwater inflow, water pumped out from dewatering system and water from rivers and courses. In the existing and abandoned Polish lignite open pits there are favorable conditions in terms of water quality formation, so the water in pit lakes is of a good quality. However, the studies indicate a potential threat to the water quality in pit lakes, where they are recharged only by groundwater. Therefore, additional recharge the void with surface water or water pumped out from dewatering wells reduces the probable pit lakes deterioration.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 441 Hydrogeologia z. 10; 167--174
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Mechanical Properties of Braze Welded Joints of Copper with Austenitic Steel Made by CMT Method
Autorzy:
Wojdat, T.
Kustroń, P.
Margielewska, A.
Stachowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/354652.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
arc welding-brazing
CMT method
dissimilar joint
Opis:
This paper outlines issues associated with gas-shielded braze welding of CU-ETP copper with austenitic steel X5CrNi18-10(1.4301) using a consumable electrode. The possibilities for producing joints of this type using innovative low-energy welding methods are discussed. The paper provides an overview of the results of metallographic and mechanical (static shear test, microhardness) tests for braze welded joints made on an automated station using the Cold Metal Transfer (CMT) method. Significant differences in the structure and mechanical properties are indicated, resulting from the joint configuration and the type of shielding gas (argon, helium).
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1411-1420
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Chemical Composition, TG – DTA and Tensile Strength Tests of Commercial Gypsum Kinds for Foundry Sandmixes Application
Autorzy:
Paduchowicz, P.
Stachowicz, M.
Baszczuk, A.
Hasiak, M.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/947630.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry
gypsum
binding material
derivatographic method
odlew
gips
materiał wiążący
badania derywatograficzne
Opis:
The paper presents the preliminary results of research on determining the possibilities of using available on the market commercial gypsum kinds as a binder for foundry moulding and core sandmixes. Construction gypsum and plaster gypsum, finishing coat and jewelry casting gypsum were tested. Elemental composition of gypsum kinds were carried out using a scanning electron microscope (SEM) with EDS/EDX probe, their crystal structure and phase composition was determined by analyzing the results of X-ray diffraction measurements (XRD) and thermogravimetric studies (TG-DTA). Evaluation of the mechanical properties of selected materials was carried out at the tensile strength test of the dog-bone samples after initial hardening of gypsum mortar at 25°C for 5 h and drying at 110°C for 24 hours. The impact of the properties of the used commercial gypsum kinds on the possibility of their use as a valuable binders in the manufacture of the foundry sandmixes for moulds and cores was evaluated. Construction gypsum and finishing coat have the highest tensile strength. Plaster gypsum and finishing coat have the longest setting time. In all tested types of gypsum, the initial water loss during heating occurs at a temperature of about 200°C. The lowest valuable properties as a binder for sand moulding mixtures has jewelry casting gypsum mass.
Źródło:
Archives of Foundry Engineering; 2020, 20, 2; 59-64
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plant macrofossils and malacocoenoses of Quaternary mineral-organic sediments at Starunia palaeontological site and vicinity (Carpathian region, Ukraine)
Autorzy:
Stachowicz-Rybka, R.
Gałka, M.
Alexandrowicz, W. P.
Alexandrowicz, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/191567.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Upper Pleistocene
Holocene
palaeoenvironment
plant macroremains
malacology
Starunia
Ukrainian
Carpathians
Opis:
The unique nature of the Starunia palaeontological site, where near-perfectly preserved large mammals were discovered at the beginning of the 20th century, and incomplete knowledge on the development of palaeoenvironment in the Velyky Lukavets River valley in the Late Pleistocene and Holocene were the reasons for undertaking new comprehensive palaeobotanical and malacological studies. Starunia is also one of the sites bearing Pleistocene fossil flora, rare in this part of Europe. The results of plant macrofossil analysis show that in the Weichselian Middle Pleniglacial the landscape was dominated by steppe and tundra plant communities, being represented mostly by various grass and sedge species. Areas of higher humidity were covered with shrub tundra with Betula nana. The temperature requirements of taxa which are cool climate indicators show that the minimum July temperature amounted to at least 10°C. The record of Late Weichselian malacofauna confirms the dominance of an open landscape, mostly with steppe and steppe-tundra communities, as well as the presence of a dry, continental climate. At the beginning of the Holocene, an improvement of climatic and humidity conditions led to a fast local expansion of plant communities of the low and transition peat bog type, in the surroundings of shallow, periodically drying-up water pools. From the Middle Pleniglacial up to the present day, the area has been characterized by the presence of species tolerating an increased amount of salt in the environment. Their presence should be associated with natural brine effluences derived from Miocene strata in the bedrock.
Źródło:
Annales Societatis Geologorum Poloniae; 2009, 79, No 3; 297-313
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena stanu innowacyjności i warunków rozwoju przemysłu wyrobów medycznych w Polsce
Evaluation of the state of innovation and condition for the further development of biomedical engineering industry in Poland
Autorzy:
Gacek, A.
Bąk, P.
Blacha-Stachowicz, B.
Augustyniak, P.
Liebert, A.
Podbielska, H.
Maniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/262123.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:
wyrób medyczny
innowacyjność
perspektywy rozwoju
medical instrumentation
innovations
development trends
Opis:
W pracy podjęto próbę identyfikacji potencjału badawczego i technologicznego-produkcyjnego producentów wyrobów medycznych. Mając na względzie te grupę firm, przeprowadzono analizę SWOT, która była podstawą do oszacowania poziomu innowacyjności producentów wyrobów medycznych w Polsce. W tej analizie szczególną uwagę zwrócono na firmy z obszaru zaawansowanych technologii w dziedzinie inżynierii medycznej. Jako rezultat dokonanych analiz wskazano istotne bariery rozwoju innowacyjności w sektorze produkcji wyrobów medycznych. Określone zostały również uwarunkowania i perspektywy rozwojowe tego sektora w ciągu najbliższych lat.
The presented work is an attempt to identify research and technological potential of Polish producers, active on market of medical products, especially specializing in the medical devices. The SWOT analysis was performed in order to estimate the innovation level in this sector. The special emphasis was placed on advanced technologies in the field of Biomedical Engineering. The limitations of the innovation development, were pointed out, along with perspectives and conditions for further expansion in the nearest future.
Źródło:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2013, 19, 4; 165-175
1234-5563
Pojawia się w:
Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new stratigraphic position of some Early Pleistocene deposits in central Poland
Autorzy:
Bujak, Ł.
Woronko, B.
Winter, H.
Marcinkowski, B.
Werner, T.
Stachowicz-Rybka, R.
Żarski, M.
Woźniak, P. P.
Rosowiecka, O.
Powiązania:
https://bibliotekanauki.pl/articles/2060173.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Late Miocene
Early Pliocene
Early Pleistocene
pollen analysis
palaeomagnetism
mineralogy
Central Poland
Opis:
A new borehole in Rożce (SW Mazovian Lowland) drilled in 2012, combined with a wide variety of research methods (palaeomagnetism, palynological analysis, studies of plant macroremains and textural features of deposits) shed new light on the age and stratigraphic position of the Early Pleistocene deposits, formerly assigned as the Lower Pleistocene. The study focuses on the deposits from 50.7-104.0 m depth, between glacial till of the Nidanian Glaciation (ca. 0.9 Ma) and the Poznań Clays (ca. 5.322 Ma). The deposits situated directly underneath the till (50.7-60.2 m) are related to the Nidanian Glaciation and show a reversed polarity and correlate with the end of the Matuyama Epoch. The deposits from 60.2-104.0 m depth were accumulated during the Early Pliocene, i.e. approximately 5.332-4.6 million years ago. They appear to correlate with the middle part of the Gilbert Palaeomagnetic Epoch and thus they are considerably older than previously thought. The cored section indicates a stratigraphic gap of about 3.5 Ma from the Lower Pliocene to the first advance of the Scandinavian ice sheets into Poland, which are thought to have occurred in the early Middle Pleistocene. The analysed deposits accumulated under variable climatic conditions showing two periods with significant aridity alternated with two periods of increased humidity. Deposits of the arid periods contain no pollen, butaeolian sand quartz grains are found. During periods of more humid climate the area was covered by various types of mixed forest.
Źródło:
Geological Quarterly; 2016, 60, 1; 238--251
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of postglacial palaeoenvironmental changes on the properties of sediments in the kettle hole at Jurki (NE Poland)
Autorzy:
Karasiewicz, T. M.
Hulisz, P.
Noryśkiewicz, A. M.
Stachowicz-Rybka, R.
Michalski, A.
Dąbrowski, M.
Gamrat, W. W.
Powiązania:
https://bibliotekanauki.pl/articles/2060388.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
young glacial landscape
kettle hole
end moraines
geochemical analysis
biogenic deposits
Opis:
This research is focused on a small kettle hole located within the Morąg moraines (Iława Lake District, NE Poland). The study objective was to determine the impact of palaeoenvironmental changes in sedimentation and properties of sediments filling the bottom of the kettle hole. Sedimentological, geochemical, and palaeobotanical studies enabled us to distinguish several development phases of the kettle hole, and cluster analysis performed on physicochemical data yielded seven local geochemical zones (JuI/I to JuI/VII). The beginning of biogenic sedimentation in the conditions of a small water body, functioning in the Late Glacial period (4.20–4.10 m), was determined on the basis of palaeobotanical research. Sediments deposited in the lake during its further evolution were rich in microelements such as Ca, Na, Mg, and K, and to a smaller extent – Fe and Mn (JuI/I–III local geochemical zones). The Late Glacial lacustrine period ended with the accumulation of very silty, pollen-free gyttja, with a stratigraphic hiatus (JuI/IV, 3.40–3.20 m). The sediments were enriched with SiO2ter, which indicates an increased rate of slope erosion, and concretions of Fe-Mn occurring below this layer (JuIII) provide evidence for lowering of the water level and even desiccation. In the Holocene, the lacustrine period ended with the accumulation of coarse detrital gyttja (3.20–2.60 m). Palaeobotanical data indicate that the next group of sediments were deposited in the Late Subboreal and Subatlantic periods (2.60–0.0 cm, JuI/V–VII; sedge peat). Their properties were varied and related to hydrologic conditions, limited denudation, and vegetation succession. There was also a significant change in the trophic conditions of the water and consequently in the sediments of the kettle hole, which changed during the lacustrine period from basic to acid, and strongly acid in the surface layer. This reaction may be related to a change in the water regime as well as to human impact in the environment, which led to the colonization of the peat bog by Sphagnum moss.
Źródło:
Geological Quarterly; 2017, 61, 2; 319--333
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
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