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    Wyświetlanie 1-7 z 7
    Tytuł:
    Love Styles in the Context of Life History Theory
    Autorzy:
    Marzec, Magdalena
    Łukasik, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2128433.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    love styles
    life history theory
    sexual strategies
    sociosexual orintation
    Opis:
    The evolutionary function of love is to create a strong bond between the partners with reproduction in view. In order to achieve this goal, humans use various sexual/reproductive strategies, which have evolved due to specific reproductive benefits. The use of particular strategies depends on many factors but one of the most important is early childhood experiences, on which life history theory (LHT) focuses. John Lee (1973) identified 6 basic love styles: eros, ludus, storge, pragma, agape, and mania. Our goal was to check whether love styles may be treated as sexual/reproductive strategies in the context of LHT – slow or fast strategy. In our study (N = 177) we found that people who prefer the slow reproductive strategy are inclined to show passionate, pragmatic and friendly love, and those who prefer the fast strategy, treated love as a game. A low level of environmental stress in childhood results in preferring eros, storge and agape love styles, belonging to the slow strategy, and a high one results in preferring ludus, which belongs to the fast strategy. People representing eros, storge or pragma styles have restricted sociosexual orientation so they prefer long-term relationships, whereas those with the ludus style are people with unrestricted orientation, preferring short-term relationships. Besides, storge, agape and pragma seem to determine preferring qualities connected with parental effort in one’s partner, mania – with mating effort, and eros – with both kinds of effort. No correlation was found between the love style and the number of children.
    Źródło:
    Polish Psychological Bulletin; 2017, 2; 237-249
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of CAP Subsidies on the Technical Efficiency of Polish Dairy Farms
    Autorzy:
    Marzec, Jerzy
    Pisulewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2076428.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stochastic frontier analysis
    dairy farms
    Bayesian approach
    panel data
    Opis:
    The main aim of this paper is to analyse the effect of Common Agricultural Policy (CAP) subsidies on technical efficiency of Polish dairy farms. We have distinguished several types of subsidies and provided an analysis to find out which types are most likely to engender systematic differences in technical efficiency. A balanced panel of microeconomic data on Polish dairy farms over an eight-year period (between 2004 and 2011), taken from the Farm Accountancy Data Network (FADN), is used. The translog production function is estimated by employing the Bayesian approach. The empirical results show that the elasticity of production with respect to livestock is the highest, whereas with respect to feed is the lowest. The mean technical efficiency in the covered period is 83%. The research reveals the negative effect of subsidies on technical efficiency.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2017, 3; 243-273
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TECHNICAL EFFICIENCY MEASUREMENT OF DAIRY FARMS IN POLAND: AN APPLICATION OF BAYESIAN VED MODEL
    Autorzy:
    Marzec, Jerzy
    Pisulewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/453896.pdf
    Data publikacji:
    2013
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
    Tematy:
    stochastic frontier models
    Bayesian VED model
    technical efficiency
    dairy farms
    Opis:
    The purpose of this paper is to measure the technical efficiency of Polish dairy farms using a Bayesian Varying Efficiency Distribution (VED) model. In particular, the paper presents the design and assumptions of frontier stochastic production function for panel data. Furthermore, it specifies the microeconomic production function based on panel data, derived from the Polish FADN (Farm Accountancy Data Network). The main part of the paper presents key findings which form the basis of understanding the technological characteristics and average efficiency of Polish dairy farms. Moreover, the exogenous variables affecting the level of average farm efficiency are identified. They are the source of significant differences in levels of efficiency of dairy farmers surveyed.
    Źródło:
    Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 2; 78-88
    2082-792X
    Pojawia się w:
    Metody Ilościowe w Badaniach Ekonomicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New method for quantitative analysis of GD2 ganglioside in plasma of neuroblastoma patients
    Autorzy:
    Czaplicki, Dominik
    Horwacik, Irena
    Kowalczyk, Aleksandra
    Wieczorek, Aleksandra
    Bolek-Marzec, Katarzyna
    Balwierz, Walentyna
    Kozik, Andrzej
    Rokita, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1040532.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    gangliosides
    HPLC
    human blood plasma
    quantitative analysis
    neuroblastoma
    Opis:
    Neuroblastoma, the most common extracranial solid tumour of childhood, is a malignancy of unknown origin and non-specific symptoms. One of the markers of the disease is GD2 ganglioside (disialoganglioside), which is abundantly expressed on the surface of neuroblastoma cells. Gangliosides are known to be shed by tumour cells and this phenomenon can be significant in cancer progression as they inhibit a number of immune responses both in vitro and in vivo. In search for novel markers useful in monitoring and prognosis of neuroblastoma, we developed and validated a new quantitative method of GD2 ganglioside analysis in human blood plasma. We evaluated the level of gangliosides in blood serum of 34 neuroblastoma patients using high-performance liquid chromatography. The technique was used to detect fluorescently labelled oligosaccharides derived from serum glycosphingolipids by enzymatic digestion with ceramide glycanase. The developed method allowed determination of GD2 concentrations at the picomole level and required only 40 µl of plasma, which should be particularly useful when the quantity of clinical material is limiting. Moreover, this method can be applied to study concentration of other gangliosides, as shown for GD3 ganglioside. Analysis of plasma samples from the 34 neuroblastoma patients did not reveal any correlations between the concentration of GD2 ganglioside and clinical parameters, including the results of therapy; it showed, however, that the concentration of GD2 ganglioside in the plasma of neuroblastoma patients decreased substantially in the course of treatment.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 3; 423-431
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal navigation for blind people
    Autorzy:
    Marzec, Paweł
    Kos, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2090710.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blind/visually impaired person
    GPS
    infrared matrix
    infrared sensors
    low-energy measurement systems
    mobile robots
    satellite navigation
    thermal navigation
    osoba niewidoma
    osoba niedowidząca
    matryca podczerwieni
    czujniki podczerwieni
    systemy pomiarowe niskoenergetyczne
    roboty mobilne
    nawigacja satelitarna
    nawigacja termiczna
    Opis:
    This article presents a system of precise navigation for a visually impaired person which uses GPS navigation and an infrared sensor in the form of an infrared matrix. The presented system allows determining the orientation and distance of a blind person relative to a selected object, e.g. a wall or road edge. The application of the above solution facilitates a significant increase in the accuracy of determining the position of a blind person compared to the accuracy offered by commonly used ground satellite devices. The system uses thermal energy accumulated in the environment without the need to generate additional signals. The main parts of the system are a simple infrared matrix, data processing system and vibrating wristband. Messages and navigation warnings are sent to a blind person in the form of a vibration code. The article describes the method of determining the path of a specified width and distance from the wall of a building, curb, etc., along which a blind person should move. The article additionally describes the method of determining the orientation of a blind person depending on the selected object. Such a method facilitates verifying whether the visually impaired person is moving according to the indicated direction. The method can also be used to navigate mobile robots. Due to the use of natural energy for data registration and processing, the mobile navigation system can be operated for a long time without the need to recharge the battery.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136038, 1--11
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal navigation for blind people
    Autorzy:
    Marzec, Paweł
    Kos, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2173567.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blind/visually impaired person
    GPS
    infrared matrix
    infrared sensors
    low-energy measurement systems
    mobile robots
    satellite navigation
    thermal navigation
    osoba niewidoma
    osoba niedowidząca
    matryca podczerwieni
    czujniki podczerwieni
    systemy pomiarowe niskoenergetyczne
    roboty mobilne
    nawigacja satelitarna
    nawigacja termiczna
    Opis:
    This article presents a system of precise navigation for a visually impaired person which uses GPS navigation and an infrared sensor in the form of an infrared matrix. The presented system allows determining the orientation and distance of a blind person relative to a selected object, e.g. a wall or road edge. The application of the above solution facilitates a significant increase in the accuracy of determining the position of a blind person compared to the accuracy offered by commonly used ground satellite devices. The system uses thermal energy accumulated in the environment without the need to generate additional signals. The main parts of the system are a simple infrared matrix, data processing system and vibrating wristband. Messages and navigation warnings are sent to a blind person in the form of a vibration code. The article describes the method of determining the path of a specified width and distance from the wall of a building, curb, etc., along which a blind person should move. The article additionally describes the method of determining the orientation of a blind person depending on the selected object. Such a method facilitates verifying whether the visually impaired person is moving according to the indicated direction. The method can also be used to navigate mobile robots. Due to the use of natural energy for data registration and processing, the mobile navigation system can be operated for a long time without the need to recharge the battery.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136038
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence oF 3D Printing Technology of Automotive Parts Made of Plastics on their Tribological Properties
    Wpływ technologii drukowania 3D samochodowych części z tworzyw sztucznych na ich właściwości tribologiczne
    Autorzy:
    Posmyk, Andrzej
    Marzec, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1857804.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    3D printing
    sunroof slider
    tribological properties
    sliding contact
    druk 3D
    ślizgacz rozsuwanego dachu
    właściwości tribologiczne
    skojarzenie ślizgowe
    Opis:
    This paper presents results of tribological examinations of chosen automotive subassemblies made of plastics by using of 3D-printing. The influence of chosen technological parameters, i.e. plastic temperature, the velocity of printing head, and the height of deposited simple layer on wear of samples produced of PA 12 polymer rubbing against hard anodised sliding guide of car sunroof is defined. It was found that samples printed at minimal temperature (t = 240°C), a minimal height of deposited simple layer (h = 0,1 mm), and a minimal (40 mm/s) and maximal (v = 60 mm/s) deposition velocity show the minimal wear. Examining under similar conditions (p = 0.4 MPa, v = 2.5 m/s, reciprocating movement) of samples made by using press moulding cut out from car sub-assemblies for a comparison were carried out. As a result of experiments, it was concluded that the wear intensity of roller stretching drive belt made from composite (PA15GF) and the wear intensity of the belt itself during sliding, caused by seizure of bearing, is so high that menaces engine with damage.
    W artykule przedstawiono wyniki badań tribologicznych wybranych podzespołów samochodowych z tworzyw sztucznych wykonanych metodą drukowania 3D. Określono wpływ wybranych parametrów technologicznych drukowania, tj. temperatury tworzywa, prędkości ruchu głowicy oraz wysokości osadzanej warstwy na zużycie próbek wykonanych z tworzywa PA 12 współpracującego z anodowaną prowadnicą odsuwanego dachu samochodu. Stwierdzono, że najmniejsze zużycie wykazują próbki drukowane w minimalnej temperaturze (t = 240°C) i przy najmniejszej wysokości osadzanej warstwy (h = 0,1 mm) oraz przy minimalnej (40 mm/s) i maksymalnej prędkości osadzania (v = 60 mm/s). Dla porównania wykonano w podobnych warunkach (p = 0,4 MPa, v = 2,5 m/s, ruch posuwisto-zwrotny) badania próbek wykonanych techniką prasowania wyciętych z podzespołów pojazdów. W wyniku badań stwierdzono, że intensywność zużywania termicznego adhezyjnego wykonanej z kompozytu (PA+15%GF) rolki napinacza paska osprzętu i samego paska podczas poślizgu, np. spowodowanego zacieraniem łożyska, jest tak duża, że zagraża uszkodzeniem silnika.
    Źródło:
    Tribologia; 2020, 294, 6; 65-70
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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