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Tytuł:
Kalkulacja kosztów budowy nawierzchni betonowych
Autorzy:
Mackiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/343011.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Producentów Cementu
Tematy:
kalkulacja kosztów
metoda obliczania
nawierzchnia betonowa
koszt budowy
koszt bezpośredni
cost calculation
calculation method
concrete pavement
construction costs
direct cost
Opis:
Koszty budowy dróg mają istotny wpływ na wybór technologii ich budowy. W niniejszym artykule zaprezentowano metodę wstępnych obliczeń pozwalających na porównanie między sobą różnych wariantów konstrukcji nawierzchni betonowych. Algorytm obliczeniowy zrealizowano w arkuszu kalkulacyjnym w powszechnie stosowanym programie MS Excel. Prosta forma arkusza kalkulacyjnego pozwala na własną ingerencję i dostosowanie formuł do własnych potrzeb w zakresie technologii i nakładu robót przy realizacji nawierzchni betonowej: górnych warstw oraz dolnych warstw. Na podstawie analizy kosztów budowy analizowanych konstrukcji można dokonywać wyboru odpowiedniej konstrukcji w zależności od możliwości technologicznych i finansowych oraz w dostosowaniu do obciążenia ruchem. „Kalkulator” przydatny jest do szacowania kosztów zarówno na drogach niskich klas oraz na drogach najwyższych klas, tj. autostradach i drogach ekspresowych.
Road construction costs have a significant impact on the choice of construction technology. This article presents a method of preliminary calculations that allows for a comparison of various variants of concrete pavement structures. The calculation algorithm was realized in a spreadsheet in the commonly used MS Excel program. A simple form of a spreadsheet allows to interpose and adapt the formulas to own needs in terms of technology and workload in the implementation of the concrete surface: upper layers and lower layers. Based on the analysis of the construction costs of the analyzed structures, it is possible to choose the appropriate structure depending on the technological and financial possibilities and adaptation to the traffic load. The „calculator” is useful for cost estimation both on low-class roads and high-class roads, ie motorways and expressways.
Źródło:
Budownictwo, Technologie, Architektura; 2020, 3; 48-49
1644-745X
Pojawia się w:
Budownictwo, Technologie, Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie MMA
Test of mineral asphalt mixtures
Autorzy:
Mączka, Eryk
Mackiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/129329.pdf
Data publikacji:
2019
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
mieszanka mineralno-asfaltowa
metoda badania
moduł sztywności
zginanie czteropunktowe
deformacja trwała
mineral-asphalt mix
test method
stiffness modulus
four-point bending
permanent deformation
Opis:
The article presents an experimental method for testing beams made of AC16W mineral-asphalt mix in a static four-point bending test. Tests were performed at a fixed measuring temperature of 25°C and for different load levels. The conditions of the study that specify the variable characteristics of asphalt mixtures were specified. Attention was paid to the material specificity of the mixturesand the variability of the stiffness modulus was analyzed. Different ways of its determination with different load cycles are presented. The obtained results of the modules were compared with the results obtained in the dynamic test. The identification of the secant modulus from the dependence of the load curve between strain and stress for the first cycle was indicated.
Źródło:
Builder; 2019, 23, 1; 68-70
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ROLA PAŃSTWA W ZRÓWNOWAŻONYM ROZWOJU SYSTEMU BANKOWEGO
Development of virtual currency schemes
Autorzy:
Mackiewicz, Piotr
Musiał, Marta
Powiązania:
https://bibliotekanauki.pl/articles/950888.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
virtual money
virtual currency schemes
Bitcoin
Opis:
The whole world conducts a lively discussion about a new creation, namely virtual currency schemes. The questions arise: What differs them from currently known systems? Do those currencies posses any real value? and finally: Do they pose any threat to conventional and current monetary systems and world economy? The interest of European Central Bank and FED into them shows how important they are. The aim of this article is to present opportunities and threats coming from the development of virtual currency schemes. The article is composed of short history of currencies showing the creation of virtual currencies as well as discusses the classification of virtual currency schemes, which is important to analyze the development direction of these schemes, as well as its chances and threats.
Źródło:
Financial Sciences. Nauki o Finansach; 2014, 1(18); 132-141
2080-5993
2449-9811
Pojawia się w:
Financial Sciences. Nauki o Finansach
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of X-ray tomography to assess fatigue structural changes in asphalt mixtures
Autorzy:
Mackiewicz, Piotr
Szydło, A.
Powiązania:
https://bibliotekanauki.pl/articles/200931.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue
air voids
fatigue damage
notch
X-ray
zmęczenie
uszkodzenie zmęczeniowe
karb
RTG
Opis:
The article presents an analysis of the change in air voids in asphalt mixtures subjected to fatigue tests at three temperatures of 0°C, 10°C and 25°C. The X-ray computerized tomography imaging method, XCT, was used to identify the air voids in the samples. The research allowed to determine changes in the content of air voids in subsequent fatigue cycles in the sample area. The relationship between air voids volume and the stiffness modulus value was also determined during fatigue for three temperatures. The largest changes were found in samples with notches at 0°C. The analysis of the change in the content of air voids showed that the micro-cracking nucleation processes develop with the number of fatigue cycles. Using the numerical model finite element method we determined the distribution and change in fatigue damage in the extreme areas of the sample during various stages of fatigue. We found clear relationship between the damage and the increased content of air voids.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 307-315
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of high-performance concretes, ultra highperformance concretes, and additive manufacturing technology in increasing the ballistic protection level of field fortifications
Autorzy:
Wysoczański, Andrzej
Partyka, Jacek
Mackiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/28124259.pdf
Data publikacji:
2023
Wydawca:
Towarzystwo Wiedzy Obronnej
Tematy:
high-performance concrete
additive manufacturing
fortification
ballistic protection
Opis:
High-Performance Concretes (HPC) and Ultra High-Performance Concretes (UHPC) allow for the production of extremely durable construction elements when compared to those same elements made of C35/45 concrete. Increased compressive- and flexural strength markedly contribute to ballistic resistance reducing the area and depth of the “crater” which results from a potential impact of a projectile or a fragment. Additionally, the presence of dispersed fibres in these mixtures eliminates the need of using reinforcement bars, which, in turn, reduces the time expenditure and labour. The article compares the results of various ballistic tests of elements made of high-performance concrete mixtures to determine the viability of applying such elements in the defence sector. Furthermore, the authors present the possibility of adapting additive technologies for the performance of field fortification tasks by the military, as part of which the HPCs and UHPCs are used as working mixtures. The authors also show the possibility of fabricating construction elements without the use of formworks, as well as printing construction elements directly at the site of future operation of the buildings.
Źródło:
Wiedza Obronna; 2023, 3
0209-0031
2658-0829
Pojawia się w:
Wiedza Obronna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wolność ku nadziei. Spotkanie z myślą ks. Józefa Tischnera
Autorzy:
Glinkowski, Witold Piotr
Mackiewicz, Witold
Powiązania:
https://bibliotekanauki.pl/books/26850421.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Opis:
Bogaty dorobek filozoficzny ks. Prof. Józefa Tischnera, mimo iż koresponduje z najbardziej reprezentatywnymi dla współczesnej myśli nurtami (fenomenologia, hermeneutyka, filozofia dialogu i inne), opiera się próbom jednoznacznej klasyfikacji podejmowanym wedle wyróżników treściowych bądź metodologicznych. Mając na uwadze zakres zainteresowań ks. Tischnera oraz fakt, że dystansował się od spekulacji, która koncentrowałaby się na zagadnieniach bytu za cenę zapoznania specyfiki rzeczywistości określanej jako „świat człowieka”, należy usytuować tę myśl w przestrzeni, na jaką sama wskazuje: w „aksjologicznym horyzoncie sensu”, a zarazem w „agatologicznym horyzoncie dramatu”.
Dostawca treści:
Biblioteka Nauki
Książka
Tytuł:
Expression of PiT1 and PiT2 retroviral receptors and transduction efficiency of tumor cells*.
Autorzy:
Grabarczyk, Piotr
Wysocki, Piotr
Gryska, Katarzyna
Mackiewicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1043759.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
renal carcinoma
retroviral vectors
PiT1 and PiT2 retroviral receptors
human melanoma
Opis:
Recombinant retroviral vectors are still the most common gene delivery vehicles for gene therapy purposes, especially for construction of genetically modified tumor vaccines (GMTV). However, these vehicles are characterized by relatively low titre and in the case of many tumor cell lines, low transduction efficiency. We constructed bicistronic retroviral vector pseudotypes of amphotropic murine leukemia virus (A-MuLV) and gibbon ape leukemia virus (GaLV), encoding enhanced green fluorescent protein (EGFP) as a rapid and easily detectable reporter gene. Transduction of five different human melanoma and four renal carcinoma cell lines by these two virus pseudotypes revealed differences in transduction efficiency, which wase markedly lower for the renal carcinoma cell lines. Stimulation of retroviral receptor expression (PiT1 and PiT2) by phosphate depletion induced a limited increase of receptor mRNA levels, but did not improve the gene transfer efficiency. In contrast, simultaneous transduction with both vector pseudotypes markedly increased the transduction efficiency, compared to GaLV or A-MuLV alone. The same effect could be achieved by several repeated exposures of target cells to fresh vector preparation. Overexpression of GaLV receptor (PiT1) in target cells significantly increased the transduction rate and enabled retrovirus mediated gene transfer into the cells which normally are not transducible by GaLV pseudotypes. We demonstrated that, using different transduction strategies, the relatively inefficient, widely used retroviral vector systems could be significantly improved.
Źródło:
Acta Biochimica Polonica; 2002, 49, 2; 333-339
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cancer immunotherapy using cells modified with cytokine genes.
Autorzy:
Kowalczyk, Dariusz
Wysocki, Piotr
Mackiewicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1043434.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cancer
cancer vaccines
cytokines
dendritic cells
gene therapy
Opis:
The ability of various cytokines to hamper tumor growth or to induce anti-tumor immune response has resulted in their study as antitumor agents in gene therapy approaches. In this review we will concentrate on the costimulation of antitumor immune responses using modification of various cell types by cytokine genes. Several strategies have emerged such as (i) modification of tumor cells with cytokine genes ex vivo (whole tumor cell vaccines), (ii) ex vivo modification of other cell types for cytokine gene delivery, (iii) delivery of cytokine genes into tumor microenvironment in vivo, (iv) modification of dendritic cells with cytokine genes ex vivo. Originally single cytokine genes were used. Subsequently, multiple cytokine genes were applied simultaneously, or in combination with other factors such as chemokines, membrane bound co-stimulatory molecules, or tumor associated antigens. In this review we discuss these strategies and their use in cancer treatment as well as the promises and limitations of cytokine based cancer gene therapy. Clinical trials, including our own experience, employing the above strategies are discussed.
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 613-624
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znak towarowy a percepcja wartości towaru. Eksperymentalne badania wyrobów
Trademark and the Perception of the Value of Merchandise. An Experimental Study of Trade Goods
Autorzy:
Falkowski, Andrzej
Mackiewicz, Robert
Podrazka, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2106667.pdf
Data publikacji:
1992
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Opis:
The purpose of the work was to carry out an experimental study on the significance of the value of trademark in the perception of a particular type of trade goods. The subject-matter of the study consists of hypothetical situations in which people choose the same cars but labeled with the trademark of some highly valued firms, such as Peugeot, and those labeled with the trademark of less renown firms, eg. FSM. The results of the experiments allowed, in the light of the cognitive-motivative conception of trademark, to present data from the point of view of the relation of similarity which was defined by the incidence of choices. From the letter the coefficient of the preference rate has been deduced. It has been reported that articles labeled in the same manner with the well-known and valuable trademark become more similar in the consumer’s cognitive representation than the articles with an unknown trademark, even if the articles in question seem to be barely similar. The results are very much in line with the contemporary investigations into the making of concepts. There is a tendency to blur the differences between trade goods and to make eminent their similar qualities in the process of forming the cognitive scheme. The paper has also drawn out attention to some practical consequences of the obtained results. The latter refers to the use of norms concerning coming up against dishonest competition for the sake of the protection of trademarks. In view of the latter the methodology of research have been worked out would allow to decide the ability to differentiate trademark in the cognitive structure of the recipient. The empirical research embraces a very narrow range of the situations of choice. Despite that, in the light of the broad, taken in its adaptive approach, analysis of the market and of the psychological mechanisms which contribute to the making of a cognitive representation of trademark, those researches may be treated as an exemplification of general laws which define the relation between trademark and trade goods in the consumer’s reaction.
Źródło:
Roczniki Filozoficzne; 1992, 39-40, 4; 93-115
0035-7685
Pojawia się w:
Roczniki Filozoficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
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