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Tytuł:
Assumptions for the proposed method of monitoring deformations in wooden grating casings in the conditions of Wieliczka Salt Mine
Autorzy:
Szpak, M.
Powiązania:
https://bibliotekanauki.pl/articles/89069.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
mining casing
historic excavations
wooden constructions
Wieliczka Salt Mine
Opis:
This article describes a measuring method used for monitoring deformations in wooden grating mining casings. It is intended, in particular, to determine the degree of deflection of load-bearing elements in relation to their original position. It was prepared especially to supplement the technical evaluation of wooden supporting casings in historic mines, underground sections of tourist routes, tunnels etc. The primary reason for the development of this problem were the designs prepared in recent years for large-scale grating constructions at Wieliczka Salt Mine and those for their reconstructions (strengthenings). The article describes the assumptions for the method proposed as well as the measurement system prepared. At Wieliczka Salt Mine two chambers with grating casings were selected and these were equipped with measuring devices. This paper presents the characteristics of these structures, the distribution of the devices installed and the course of the measuring process.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 161-170
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The significance of gamma-and lambda-dislocations in transient states of phyllotaxis: how to get more from less - sometimes
Autorzy:
Zagorska-Marek, B.
Szpak, M.
Powiązania:
https://bibliotekanauki.pl/articles/59112.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
In some plants, developmental changes of phyllotaxis are so frequent that the whole spectrum of phyllotactic patterns becomes available for investigation and thus many unknown subtleties of phyllotaxis come to light. Among these, Magnolia acuminata is the most prominent. In a series of experiments performed in silico with application of a simple geometric model of phyllotaxis, we were able to confront the empirical data on phyllotactic transitions occurring in magnolia flowers with the results of computer simulations. They revealed that in addition to the ratio between the sizes of plant organs, the history of developing pattern was also important, especially for the direction of ontogenetic changes. The parameters of size tolerance and vertical tolerance in positioning a new element in the first available space, brought the effects of simulations closer to the real patterns. They helped especially to resolve the enigma of multiplication of parastichies (γ-dislocations) observed sometimes during determined growth of magnolia floral axes. We conclude that ontogenetic changes in phyllotaxis result mainly from changing sizes of organs in the course of development and that the changes do not always occur with mathematical accuracy.
Źródło:
Acta Societatis Botanicorum Poloniae; 2016, 85, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phyllotaxis instability - exploring the depths of first available space
Autorzy:
Szpak, M.
Zagorska-Marek, B.
Powiązania:
https://bibliotekanauki.pl/articles/56528.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
phyllotaxis
instability
depth
available space
phyllotactic transition
shoot apical meristem
plant
ontogenesis
Opis:
The theoretical analysis of the consequences of the phyllotactic pattern being propagated according to the first available space rule has revealed that all monojugate patterns, with the exception of the main Fibonacci pattern, should become developmentally unstable in their low expressions. This fact explains why the main Fibonacci pattern plays the dominant role among other patterns of spiral phyllotaxis. The probability that the pattern becomes unstable varies for different patterns, which likely makes them more or less frequent, and thus easier or more difficult to encounter in nature. The unstable pattern inevitably transforms into another, as the computer simulations show. Theoretically predicted instability of low order phyllotaxis may be treated as one of the causes of natural ontogenetic transitions, occurring in plants. This, however, still does not explain why in nature some patterns with high order of phyllotaxis also change, quite readily one into the other, in shoot apical meristem’s ontogeny.
Źródło:
Acta Societatis Botanicorum Poloniae; 2011, 80, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania potencjometryczne, ESI-MS i NMR nad kompleksowaniem magnezu(II) i wapnia(II) wybranymi kwasami bisfosfonowymi w roztworze wodnym
Potentiometric, ESI-MS and NMR combined studies on the magnesium(II) and calcium(II) complexation by selected bisphosphonic acids in aqueous solution
Autorzy:
Szpak, M.
Matczak-Jon, E.
Kurzak, B.
Powiązania:
https://bibliotekanauki.pl/articles/142597.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
bisfosfoniany
kompleksy
równowagi
NMR
potencjometria
ESI-MS
bisphosphonates
complexes
equilibria
potentiometr
Opis:
Przeprowadzono badania nad równowagami w roztworze układów Mg(II)/Ca(II)-L (L= kwas (cykloheksylo)aminometano-1,1-difosfonowy (1), kwas azepan-1-ylo-metano-1,1-difosfonowy (2), kwas azekan-1-ylo-metano-1,1-difosfonowy (3)) metodami pH-potencjometrii, NMR i ESI-MS. Uzyskane wyniki wskazują, że we wszystkich badanych układach preferowane jest tworzenie kompleksów jednordzeniowych o stechiometrii 1:1. Rozpatrywane związki wiążą koordynacyjnie Mg(II) i Ca(II) poprzez atomy tlenu grup fosfonianowych w szerokim zakresie wartości pH.
Solution equilibrium studies on the Mg(II)/Ca(II)-L systems (L= (cyclohexyl)aminomethane-1,1-diphosphonic acid (1), azepan-1-yl-methane-1,1-diphosphonic acid (2), azecan-1-yl-methane-1,1-diphosphonic acid (3) have been performed by pH-potentiometry, NMR and ESI-MS methods. The obtained results suggest preference for the formation of mononuclear complexes of 1:1 stoichiometry in all studied systems. Compounds under consideration coordinate Mg(II) and Ca(II) through oxygen atoms of the phosphonate groups over a broad pH range.
Źródło:
Chemik; 2014, 68, 4; 321-328
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksploatacja złoża w filarze oporowym pochylni centralnych 9-12 - doświadczenia z fazy robót rozcinkowych
Cooper ore exploitation experience in pillar of the central inclined drift 9-12
Autorzy:
Dębkowski, R.
Iwulski, Z.
Kirej, M.
Szpak, M.
Powiązania:
https://bibliotekanauki.pl/articles/348891.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
obserwacje i pomiary
stateczność wyrobisk
ocena stanu górotworu
badania zachowania się górotworu
rock deformation
rock mass stability
measurements methods
Opis:
Przedstawiono analizę wpływu robót górniczych w polu G-15/10 na zachowanie się górotworu w okresie od rozpoczęcia robót rozcinkowych w 2003 roku do września 2009. Zakres analizy obejmuje charakterystykę warunków geologiczno-górniczych, przebieg eksploatacji, charakterystykę rejestrowanej aktywności sejsmicznej oraz ocenę zachowania się górotworu m.in. na podstawie prowadzonych obserwacji i pomiarów.
In the article was described basic geological and mining technology condition in pillar of the Central inclined drift 9-12 Rudna cooper mine. The primary objective was present the exploitation history between 2003-2009, seismic activity in this region and analysis results of rock deformation measurements with different methods.
Źródło:
Górnictwo i Geoinżynieria; 2010, 34, 2; 193-200
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza dokonanej eksploatacji oraz sposobu dalszego prowadzenia robót eksploatacyjnych w polu G-7/5 O/ZG "Rudna"
Analysis of ore exploitation process and future plans in "G-7/5" panel in Rudna Cooper Mine
Autorzy:
Butra, J.
Dębkowski, R.
Iwulski, Z.
Szpak, M.
Powiązania:
https://bibliotekanauki.pl/articles/350470.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
górnictwo podziemne
metody obserwacji i pomiarów
ocena stateczności górotworu
underground mining
observations and measurements methods
rating of rock mass stability
Opis:
Scharakteryzowano warunki geologiczno-górnicze prowadzonej eksploatacji, występujące w rejonie pola G-7/5. Opisano przebieg robót górniczych od momentu rozpoczęcia eksploatacji w 2002 r. Przeanalizowano wyniki prowadzonych badań i obserwacji zachowania się górotworu oraz dokonano oceny stanu zagrożenia sejsmicznego w polu. Złoże rud miedzi w polu G-7/5, zlokalizowane jest na głębokości około 870 m, w skrzydle wiszącym uskoku "Biedrzychowa". W polu wydzielono trzy bloki eksploatacyjne. Bardzo trudne warunki geologiczno-górnicze w polu, zwłaszcza w bloku "A", powodowały wielokrotne zmiany kierunku prowadzenia robót, w tym na zroby i strefy upodatnione. Obecnie prowadzone są roboty likwidacyjne w bloku "A" i roboty rozcinkowe w bloku "B", które uruchomiono w sierpniu 2010 roku. Ze względu na poziom aktywności można wyróżnić trzy okresy podczas prowadzonej eksploatacji od października 2009 do września 2010 roku, które odpowiadają specyfice prowadzonych robót wybierkowych oraz stosowanej profilaktyce zagrożenia sejsmicznego. Lokalizacja ognisk silnych wstrząsów wskazuje, że większość z nich występowała w liniach uskoków, przebiegających przez strefę roboczą pola G-7/5 oraz na krawędziach prowadzonej rozcinki złoża. Dotychczasowej eksploatacji towarzyszył stosunkowo wysoki poziom zagrożenia tąpaniami i zawałami, głównie ze względu na zaangażowanie tektoniczne.
In the paper geological and mining technology conditions in "G-7/5" panel of Rudna Cooper Mine was described. The mining process started in 2002 is presented as well. The results of rock mass observations and measurements were characterized and seismic hazard in "G-7/5" panel was evaluated. Ore body in "G-7/5" panel is located at a depth of 870 m in the downthrown side of "Biedrzychowa" fault. "G-7/5" panel is composed of three smaller excavation blocks. Hard geological and mining conditions in this panel, especially in block "A", often result in mining direction changes e.g. toward old workings and yielding zones. At present in block "A" liquidation works are carried out. In block "B" face-entry drivage was started in August 2010. Depending on activity level, during mining in that area between October 2009 and September 2010, three different periods can be distinguished. They correspond with the specific character of mining works and prevention methods against seismic activity hazard. Location of mining tremors indicate that many of them occurred in faults lines running through the working area in "G-7/5" panel and on the block development edges. Due to tectonic dislocations in this area, mining in "G-7/5" panel was connected with relatively high level of bumps and roof falls hazard.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 2; 121-128
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radon in drinking water in the Białystok region of Poland
Autorzy:
Karpińska, M.
Kapała, J.
Mnich, Z.
Szpak, A.
Powiązania:
https://bibliotekanauki.pl/articles/148370.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radon in water
Białystok region
liquid scintillation
Opis:
Water is one of the indoor sources of 222Rn. As radon is soluble in water, it is carried indoor by water supply and there it is released. The presence of radon in groundwaters is caused by direct migration of 222Rn from rocks and soil to waters as well as by radium content in water. Radon inflow indoor is possible in the areas where drinking water shows high radon concentration. Radon concentration changes significantly from low in natural surface water to relatively high from water in drilled wells. It is estimated that out of 10,000 Bq·m–3 of radon contained in water supply we can obtain radon concentration increase by 1 Bq·m–3 indoor. The aim of the study was to measure radon in water supply in the Białystok region and also estimation of doses and investigation how the treatment influenced radon concentration in water. Water was collected from rural and municipal waterworks as well as from home wells. Measurements of radon concentration in particular stages of drawing and treatment of water in Białystok waterworks were also conducted. A liquid scintillation method was used in the study. The arithmetic mean of radon concentrations in the samples was equal to 5800 Bq·m–3, median – 4800 Bq·m–3, and geometric mean – 4600 Bq·m–3. The lowest values of radon concentration were observed in surface waters (from surface intake). Radon concentrations in waters from drilled wells, shallow home wells and surface intake were compared and statistically significant differences were obtained at p < 0.05. The results of radon concentrations in drinking water in the Białystok area revealed radon-poor waters (88%) and low-radon waters (12%).
Źródło:
Nukleonika; 2010, 55, 2; 177-180
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ptasi teatr
Autorzy:
Olszowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/847007.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Tematy:
ornitologia
ptaki
sojka
Garrulus glandarius
szpak
Sturnus vulgaris
drozd spiewak
Turdus philomelos
gasiorek
Lanius collurio
skowronek polny
Alauda arvensis
spiew ptakow
Źródło:
Wszechświat; 2017, 118, 07-09
0043-9592
Pojawia się w:
Wszechświat
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waiting time for treatment of women with breast cancer in Podlaskie Voivodeship (Poland) in view of place of residence. A population study
Autorzy:
Maslach, D.
Krzyzak, M.
Szpak, A.
Owoc, A.
Bielska-Lasota, M.
Powiązania:
https://bibliotekanauki.pl/articles/50218.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction: Treatment delay is a major problem of contemporary oncology. Knowing the time interval between diagnosis and initiation of treatment, together with monitoring this adverse prognostic factor, is an important element of the treatment planning process in the population and can contribute to the improvement of patients’ curability. Objective: To assess the waiting time for first treatment of women diagnosed with breast cancer in 2001-2002 in Podlaskie Voivodeship. Materials and methods: During 2001-2002, there were 709 cases of women with breast cancer who reported to the Voivodeship Cancer Registry in Bialystok. 659 women were diagnosed with a primary invasive breast tumour. A cohort of 499 women who were treated with a curative intent was selected from this group. The waiting time in the created cohort was calculated as the number of days between the date of the breast cancer diagnosis and date of the first treatment. Results: The average time between the date of diagnosis and date of the first treatment was 38 days. The median was 14 days. 28.6% of patients from the selected cohort waited longer than 28 days. The treatment of rural women was initiated faster than the treatment of urban patients.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of an anti-tobacco programme of health education on changes in health behaviours among junior high school adolescents in Białystok, Poland
Autorzy:
Kanicka, M.
Poniatowski, B.
Szpak, A.
Owoc, A.
Powiązania:
https://bibliotekanauki.pl/articles/49901.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction. School health education programmes are among the instruments for the prevention of tobacco smoking among children and adolescents. Knowledge obtained in evaluation studies of these programmes indicates the degree of their effectiveness and serves to improve their quality. Objective. Recognition and evaluation of the effect of two-year anti-tobacco programme of health education on the changes in the level of knowledge, attitudes and behaviours of adolescents. Materials and method. An intervention study was originated in May 2007, and covered 859 first-year schoolchildren from eight public junior high schools in Białystok in Poland, from among 3,318 schoolchildren attending 33 schools. The sample was selected by means of two-stage stratified sampling with consideration of two groups: an intervention group covered with educational actions (417 schoolchildren), and a control group (442 schoolchildren), where anti-tobacco education was not carried out. Before the educational programme and after its completion an evaluation of knowledge, attitudes and behaviours of junior high school adolescents was performed with respect to nicotinism, based on a survey. The educational part consisted in conducting within 2 years, 4 educational classes and 2 competitions concerning tobacco-related problems. Results. After two years, in the group of adolescents covered by the educational programme a significant increase was observed – by 11.6% – in the percentage of schoolchildren who were familiar with the negative effects of tobacco smoking, and an increase by 4.4% of those who were convinced that smoking is harmful. With respect to adolescents’ attitudes, the effect of the programme was noted in only one of six components analyzed. After completion of the two-year educational programme, both in the group covered by this programme and the control group, the percentage of smokers significantly increased (by 12.8% and 12.7%, respectively). Conclusions. It is necessary to evaluate the health education programme from the aspect of both the actual hard effects of the anti-nicotine programme (changes in behaviour), and indirect effects – soft (knowledge, skills) which are a basis for the potential verification of the programme in order to increase its effectiveness.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 28

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