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Wyświetlanie 1-15 z 885
Tytuł:
Systemic inflammation markers in blood samples of colorectal cancer patients
Autorzy:
Grudzińska, M.
Jakubowska, Katarzyna
Koda, M.
Koda, L.
Kisielewski, W.
Smereczański, N.
Rogoz-Jezierska, N.
Famulski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1918917.pdf
Data publikacji:
2020-06-10
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Colorectal cancer
neutrophil-to-monocyte ratio
monocytetolymphocyte ratio
Opis:
Introduction: Colorectal cancer (CRC) is one of the most common cancers in Poland. The aim of this study was to investigate the clinical significance of absolute monocyte count, neutrophil-to-monocyte ratio (NMR) and monocytetolymphocyte ratio (MLR) in pre- and postoperative blood samples of patients with CRC. Materials and Methods: We retrospectively reviewed medical records of 160 patients diagnosed with CRC who underwent surgery. Blood samples were obtained within 3 days before and after the surgical treatment. Venous blood samples were also obtained from 42 healthy controls. Results: Pre- and postoperative NMR were significantly higher than healthy controls (p<0.0001; p<0.0001). Moreover, MLR in pre-and postoperative blood samples were higher than voluntaries (p<0.001; p<0.001). The area under the ROC curve for pre and postNMR showed that the parameter exhibits strong diagnostic power (1.000). Pre- and postMLR had moderate diagnostic power amount 0.751 and 0.746. There is also correlation between monocyte count in samples obtained before and after surgery and, lymph node metastasis and size of lymph node metastasis in both cases. PreNMR value was significantly associated with venous and lymphatic invasion and the presence of cancer deposits. PostNMR was found to correlate with presence of distant metastasis and cancer cell deposits (R=0.633, p<0.001; R=0.158, p=0.040). Moreover, preMLR value was correlated with only perineural invasion. Conclusions: Analyzed hematologic markers may be useful as simply obtained parameters, next to histopathological examination, that determine a systemic immune response
Źródło:
Progress in Health Sciences; 2020, 10(1); 92-101
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An AC measurement system for use with resistive temperature sensors
Autorzy:
Rybski, R.
Walkowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/114103.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AC resistance thermometry
resistance ratio measurement
complex voltage ratio
Opis:
In the paper, a measurement system based on a universal commercial measuring module of alternating current for accurate temperature measurement by means of resistive temperature sensors is described. There are presented the research results on the basis of which the metrological properties of the system were evaluated. It was shown that this relatively simple measurement system is a competitive solution compared with the most accurate commercial DC measurement systems.
Źródło:
Measurement Automation Monitoring; 2016, 62, 8; 259-261
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pore Fluid and Lithology Discrimination of a Well in the Niger Delta Region using Elastic Parameters
Autorzy:
Agbasi, Okechukwu E.
Chukwu, Godwill U.
Igboekwe, Magnus U.
E. Etuk, E. Etuk
Powiązania:
https://bibliotekanauki.pl/articles/1112773.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Elastic Parameters
Lithology
Poisson’s ratio
Pore Fluids
Velocity ratio
Opis:
With respect to the high uncertainties associated with methods of determining lithology and pore fluid using well logs, quantitative rock physics analyses was used to determine the lithology and pore fluid of a reservoir in the Niger Delta. Inaccurate prediction of lithology and pore fluid results in the inaccurate determination of other petrophysical properties and parameters such as porosity, permeability, net pay, etc. The primary objective of this research is to predict lithology and pore fluid using rock physics analysis. However, reservoir zones were also predicted. Density, compressional wave velocity and shear wave velocity logs were used as input to calculate elastic parameters such as velocity ratio, Poisson’s ratio and Bulk Modulus. The calculated velocity ratio log was used to differentiate between sand and shale. Poisson’s ratio and velocity ratio using the Goodway interpretation template was carried out and used to delineate pore fluid content; gas sand, oil sand and sandstone formation from cross-plot analysis.
Źródło:
World News of Natural Sciences; 2018, 17; 75-88
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical and operating problems yielded from setting up the optimum value of geometric compression ratio in piston engines
Uwarunkowania techniczne i eksploatacyjne związane z wyborem optymalnej wartości geometrycznego stopnia sprężania w silnikach tłokowych
Autorzy:
Woś, P.
Jaworski, A.
Kuszewski, H.
Lejda, K.
Ustrzycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/133118.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
compression ratio
variable compression ratio engine
VCR
Variable Compression Ratio
stopień sprężania
silnik o zmiennym stopniu sprężania
Opis:
The article discusses the problem of choosing the optimal compression ratio value in internal combustion engines at their design phase, according to today's development trends toward high economy and ecology of road transportation and the divers' expectations in vehicle use and performance. Because the variable compression ratio technology VCR is not yet developed well enough to be implemented into the mass production of engines in the near future, the choice of compression ratio value is always a serious task for constructors to find a compromise between the functional engine properties, operational characteristics, engine efficiency, the powertrain design complexity, and finally the exhaust emission level. Therefore, the paper examines the impact of the compression ratio on the combustion engine parameters mentioned above and presents some innovative designs, where the settings of the compression ratio value beyond the conventional range is connected with using additional solutions in design structure and control systems, with modifications corresponding to the working process in these engines.
W artykule omówiono problem wyboru optymalnej wartości stopnia sprężania przy konstruowaniu silników spalinowych, zgodnie z trendami rozwojowymi w zakresie spełnienia wskaźników ekonomiki i ekologii transportu drogowego oraz ze współczesnymi oczekiwaniami użytkowników pojazdów w zakresie ich osiągów i eksploatacji. Ponieważ technologia zmiennego stopnia sprężania VCR (ang. Variable Compression Ratio) nie jest jeszcze na tyle zaawansowana, aby można było oczekiwać w najbliższym czasie jej wdrożenia do produkcji seryjnej, wybór wartości stopnia sprężania jest dla konstruktorów zawsze zadaniem znalezienia kompromisu pomiędzy założonymi parametrami użytkowymi, cechami eksploatacyjnymi, sprawnością silnika, złożonością konstrukcji i poziomem emisji szkodliwych składników spalin. W artykule przedstawiono zatem przeanalizowany wpływ wartości stopnia sprężania na wymienione wyżej parametry silników spalinowych oraz podano przykłady innowacyjnych konstrukcji, w których ustalenie wartości stopnia sprężania poza konwencjonalnym zakresem uwarunkowane jest zastosowaniem dodatkowych rozwiązań konstrukcyjnych i systemów sterujących, odpowiednio modyfikujących przebieg procesu roboczego w tych silnikach.
Źródło:
Combustion Engines; 2016, 55, 1; 3-12
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Research on the Impact of Thin-Wall Ratio and the Fillet Radius of Forming Roller on the Limiting Spinning Ratio of AMS 5504 Sheets
Autorzy:
Kut, S.
Stachowicz, F.
Ryzińska, G.
Mrugała, T.
Powiązania:
https://bibliotekanauki.pl/articles/355601.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spinning
experiment
AMS 5504 sheet
limiting spinning ratio
thin-wall ratio
Opis:
Results of experimental investigations of metal spinning process of AMS 5504 sheets. cylindrical drawpieces with use of discs-shaped sheet with various diameter and thickness were shown in this work. Tests were performed on two roller metal spinning machine of a vertical axis Leifeld SFC 800 V500. The main objective of the study was to determine the dependence between limiting spinning coefficient, thin wall ratio coefficient and the fillet radius of forming rollers. To realize this aim required the development of an original methodology and experimental research plan. Determined relationship takes into account the occurrence of negative phenomena in the process of spinning such as wrinkling or cracking of material. Due to the possibility of prediction of these negative phenomena, determined relationship is used in the design of a metal spinning processes. On the basis on determined relationship can be done a practical assessment of the possibility of shaping with certain geometrical parameters by spinning. Obtained results were shown graphically on the diagrams and their analysis was carried.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2261-2266
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The profitability of Japanese yen carry trades
Autorzy:
Czech, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/580951.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
foreign exchange market
carry trade
Japanese yen
Sharpe ratio
Calmar ratio
Opis:
The aim of the paper is to examine the profitability of Japanese yen carry trade strategies. It has been shown that for the sample of 11 years, annualized excess return of carry trade strategies are positive. Estimated average excess returns, Sharpe ratio and Calmar ratio turn out to reach the levels similar to those reported by other researchers. Moreover, the paper reports that estimated excess returns and Sharpe, Calmar ratios are high and positive during the period from 01.2006 to 07.2007 and negative during the time of high financial turbulence. Additionally, during the time of turbulence in financial markets, when carry trade performs poorly, low-yielding currencies tends to appreciate against high-yielding currencies. It implies that Japanese yen, as an example of the most popular funding currency, may provide a hedge during unstable times of high price volatility in financial market.
Źródło:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2017, 486; 245-253
1899-3192
Pojawia się w:
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of a combined cycle power plant due to auxiliary heating from the combustion chamber of the gas turbine topping cycle
Autorzy:
Khan, Mohammad Nadeem
Powiązania:
https://bibliotekanauki.pl/articles/1845501.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pressure ratio
air-fuel ratio
supplement heating
exergy analysis
energy analysis
Opis:
Energy demand is increasing exponentially in the last decade. To meet such demand there is an urgent need to enhance the power generation capacity of the electrical power generation system worldwide. A combined-cycle gas turbines power plant is an alternative to replace the existing steam/gas electric power plants. The present study is an attempt to investigate the effect of different parameters to optimize the performance of the combined cycle power plant. The input physical parameters such as pressure ratio, air fuel ratio and a fraction of combustible product to heat recovery heat exchanger via gas turbine were varied to determine the work output, thermal efficiency, and exergy destruction. The result of the present study shows that for maximum work output, thermal efficiency as well as total exergy destruction, extraction of combustible gases from the passage of the combustion chamber and gas turbine for heat recovery steam generator is not favorable. Work output and thermal efficiency increase with an increase in pressure ratio and decrease in air fuel ratio but for minimum total exergy destruction, the pressure ratio should be minimum and air fuel ratio should be maximum.
Źródło:
Archives of Thermodynamics; 2021, 42, 1; 147-162
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of uncertainty on capital structure
Autorzy:
Wennie, Wennie
Nugroho, Vina C
Powiązania:
https://bibliotekanauki.pl/articles/18104683.pdf
Data publikacji:
2023-09-28
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
Tematy:
target leverage ratio
uncertainty
Opis:
The purpose of this study is to determine the effect of uncertainty on the capital structure of public listed companies in Indonesia. This study used asset volatility as a method of measuring uncertainty. The researchers use unbalanced panel data from 2009 to 2019 in order to assess and analyse the effect of uncertainty on the company‘s capital structure. The results of this study indicate a positive relationship between uncertainty and the company‘s target leverage.
Źródło:
Journal of Management and Financial Sciences; 2023, 47; 71-86
1899-8968
Pojawia się w:
Journal of Management and Financial Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On testing the hypothesis of stability of the ratio of two random variables.
O testowaniu hipotezy o stabilności wartości oczekiwanej ilorazu dwóch zmiennych losowych
Autorzy:
Kończak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/907022.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
ratio
testing stability
autoregression
Opis:
The problem of testing the hypothesis of the stability of expected value of the ratio of random variables is considered in the article. The ratio of random variables X and Y under assumptions of the autoregression models is analyzed. A test which makes it possible to verify the mentioned hypothesis is proposed. The problem being considered in the article appears in the statistical quality control when the proportions of dimensions of the product or the proportion of components in mixtures are required to be stable.
W artykule zaprezentowano propozycję testu pozwalającego na weryfikację hipotezy o stabilności wartości oczekiwanej ilorazu zmiennych losowych. W rozważaniach przyjęto, że w kolejnych n okresach czasowych dokonywane są pomiary wartości zmiennych losowych Y i X. Przedmiotem analizy jest iloraz zmiennych losowych Z = Y/Х przy założeniu modelu autoregresji. Problem przedstawiony w artykule jest spotykany w zagadnieniach statystycznej kontroli jakości, gdy niezbędne jest zachowanie odpowiedniej proporcji np. dla wymiarów produktu czy proporcji składników w mieszaninach.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new confidence interval for the odds ratio
Autorzy:
Zielińska-Kolasińska, Zofia
Zieliński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/14785942.pdf
Data publikacji:
2023-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
confidence interval
odds ratio
Opis:
We consider the problem of interval estimation of the odds ratio. An asymptotic confidence interval is widely applied in economics, medicine, sociology, etc. Unfortunately, this confidence interval has a poor coverage probability, significantly smaller than the nominal confidence level. In this paper, a new confidence interval is proposed. Its construction requires only information on the sizes of samples and the sample odds ratio. The coverage probability of the proposed confidence interval is at least the nominal confidence level.
Źródło:
Statistics in Transition new series; 2023, 24, 2; 113-128
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cost-effectiveness ratio for comparing social and health policies
Autorzy:
Galeone, Carlotta
Pollastri, Angiola
Powiązania:
https://bibliotekanauki.pl/articles/433961.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
incremental cost-effectiveness ratio
distribution of the ratio of two correlated normal r.v.
confidence intervals for the ratio
Opis:
The analysis of the incremental cost-effectiveness ratio (ICER) is an important part of the social and health decision-making process, because ICER is used to obtain simultaneous information on the cost and effectiveness of a new intervention when compared to another one. Despite the increasing use of the ICER, studies on its statistical methodology have still not been sufficiently developed. In particular, the calculation of the confidence interval for the ICER is fundamental to take into account the uncertainty due to differences in samples. In this paper, a new parametric technique for the construction of confidence intervals for the ICER is proposed. It is based on the distribution of the ratio of two correlated normal variables. The method discussed has always existed, despite the degenerate cases of the classical parametric method proposed by Fieller, for which the classical region is not an interval. The computation of the confidence intervals proposed in the present paper may also be achieved in a feasible way.
Źródło:
Śląski Przegląd Statystyczny; 2013, 11(17); 123-131
1644-6739
Pojawia się w:
Śląski Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of rare earth elements in the Baba Ali magnetite skarn deposit, western Iran – a key to determine conditions of mineralisation
Autorzy:
Zamanian, H.
Radmard, K.
Powiązania:
https://bibliotekanauki.pl/articles/94484.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Almoughlagh
Ce/Ce ratio
Eu/Eu ratio
La/Y ratio
stosunek Ce/Ce
stosunek Eu/Eu
stosunek La/Y
Opis:
The Baba Ali skarn deposit, situated 39 km to the northwest of Hamadan (Iran), is the result of a syenitic pluton that intruded and metamorphosed the diorite host rock. Rare earth element (REE) values in the quartz syenite and diorite range between 35.4 and 560 ppm. Although the distribution pattern of REEs is more and less flat and smooth, light REEs (LREEs) in general show higher concentrations than heavy REEs (HREEs) in different lithounits. The skarn zone reveals the highest REE-enriched pattern, while the ore zone shows the maximum depletion pattern. A comparison of the concentration variations of LREEs (La–Nd), middle REEs (MREEs; Sm–Ho) and HREEs (Er–Lu) of the ore zone samples to the other zones elucidates two important points for the distribution of REEs: 1) the distribution patterns of LREEs and MREEs show a distinct depletion in the ore zone while representing a great enrichment in the skarn facies neighbouring the ore body border and decreasing towards the altered diorite host rock; 2) HREEs show the same pattern, but in the exoskarn do not reveal any distinct increase as observed for LREEs and MREEs. The ratio of La/Y in the Baba Ali skarn ranges from 0.37 to 2.89. The ore zone has the highest La/Y ratio. In this regard the skarn zones exhibit two distinctive portions: 1) one that has La/Y >1 beingadjacent to the ore body and; 2) another one with La/Y < 1 neighbouring altered diorite. Accordingly, the Baba Ali profile, from the quartz syenite to the middle part of the exoskarn, demonstrates chiefly alkaline conditions of formation, with a gradual change to acidic towards the altered diorite host rocks. Utilising three parameters, Ce/Ce*, Eu/Eu* and (Pr/Yb)n, in different minerals implies that the hydrothermal fluids responsible for epidote and garnet were mostly of magmatic origin and for magnetite, actinolite and phlogopite these were of magmatic origin with low REE concentration or meteoric water involved.
Źródło:
Geologos; 2016, 22, 1; 33-47
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exhaust emission features of variable compression ratio (VCR) diesel engine
Autorzy:
Woś, P.
Kuszewski, H.
Ustrzycki, A.
Powiązania:
https://bibliotekanauki.pl/articles/247640.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diesel engine
compression ratio
variable compression ratio VCR
exhaust emission
toxic compounds
Opis:
One of the important design parameters for internal combustion engines is the geometric compression ratio epsilon. It is defined by the ratio of the maximum volume of the combustion chamber Vmax at the bottom dead centre (BDC) piston position and a minimum volume of the combustion chamber Vmin at the top dead centre (TDC) piston position. Conventional engines have this parameter set unchangeable, what is not the solution ensuring optimal benefits coming from the heat release in the combustion process, especially under altering conditions of load and speed in which they perform powering the road vehicles. It is reflected mainly in exhaust emission problem. Despite a considerable progress, further improving the ecological and energetic performances of the piston engines faces severe system limits, elimination of which requires major changes in engine design, including conversion the fixed compression ratio into the flexible one. For such innovative engine designs with so-called variable compression ratio VCR feature the geometric compression ratio parameter is as the one of the operation regulators. Due to the new development prospect the paper scope is an analysis and showing some results for the impact of compression ratio on the emissions of selected exhaust harmful components for a direct injection diesel engine. The schematics and prototype solutions for VCR technology are briefly presented too.
Źródło:
Journal of KONES; 2010, 17, 3; 521-526
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity ratios of thorium isotopes in living species compared with other environmental samples
Autorzy:
Kierepko, R.
Mietelski, J. W.
Gaca, P.
Tomankiewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/146760.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
activity ratio 228Th/232Th
activity ratio 230Th/232Th
Opis:
The paper presents the results of alpha spectrometric measurements of 228Th/232Th and 230Th/232Th activity ratios for many samples of some living species analyzed within last years in our laboratory within different projects. The results were compared with typical values for soil or other non-biological samples. All results were obtained by means of alpha spectrometry.
Źródło:
Nukleonika; 2008, 53, 1; 27-30
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Buckling stability assessment of plates under uniaxial compression
Autorzy:
Riahi, Farhad
Zirakian, Tadeh
Ghaderi, Vahed Mam
Arya, Souran
Powiązania:
https://bibliotekanauki.pl/articles/102344.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
plates
buckling
support conditions
aspect ratio
design ratio
slenderness ratio
numerical simulation
płyty
wyboczenie
współczynnik proporcji
współczynnik smukłości
symulacja numeryczna
Opis:
Buckling of thin-walled and load-bearing elements of a structure can have devastating consequences. Hence, buckling checks are an integral part of strength analysis of structures. The buckling problem of thin rectangular plates subjected to in-plane compressive and/or shear loading is of great importance in building, bridge, aerospace, marine, and shipbuilding industries. When buckling occurs, thin plates undergo large out-of-plane deflections, which in turn results in the development of large bending stresses and eventually complete failure of the structure. This paper deals with the buckling stability assessment of uniaxially-compressed plates with different support conditions within the framework of classical plate theory. The main objective of this research is to explore some uncovered aspects of buckling stability of plates by considering the effects of support conditions, aspect ratio, and slenderness ratio, which will consequently result in efficient design of such thin-walled structures. To this end, in addition to validation of the numerical simulation, some case studies have been performed in order to gain a better understanding of different aspects of buckling stability of such thin-walled structures.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 2; 97-105
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 885

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