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Wyświetlanie 1-50 z 2249
Tytuł:
The interdependenc of parasites in parasitocenoses of the intestine of animals
Wzajemne stosunki między pasożytami w parazytocenozach jelita u zwierząt
Vzaimnye sootnoshenija mezhdu parazitami v parazitocenozakh kishechnika u zhivotnykh
Autorzy:
Kurasvili, B.E.
Powiązania:
https://bibliotekanauki.pl/articles/2165054.pdf
Data publikacji:
1976
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1976, 22, 4-5; 417-418
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Microstructure and Mechanical Properties of Cast Steel Carried out on Cast-on Samples and Samples Cast Separately
Autorzy:
Kalandyk, B. E.
Zapała, R. E.
Powiązania:
https://bibliotekanauki.pl/articles/1837717.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast steel
cast-on samples
heat treatment
mechanical properties
metallography
staliwo
próbki odlewu
obróbka cieplna
właściwości mechaniczne
metalografia
Opis:
The results of microstructure examinations and UTS, YS, El, RA carried out on low-carbon cast steel containing 0.15% C. The tests were carried out on specimens cut out from samples cast on a large-size casting and from samples cast in separate foundry moulds. It has been shown that significant differences in grain size observed in the material of the separately cast samples and cast-on samples occur only in the as-cast. In the as-cast state, in materials from different tests, both pearlite percent content in the structure and mean true interlamellar spacing remain unchanged. On the other hand, these parameters undergo significant changes in the materials after heat treatment. The mechanical properties (after normalization) of the cast-on sample of the tested cast steel were slightly inferior to the values obtained for the sample cast in a separate foundry mould. The microscopic examinations of the fracture micro-relief carried out by SEM showed the presence of numerous, small non-metallic inclusions, composed mainly of oxide-sulphides containing Mn, S, Al, Ca and O, occurring individually and in clusters.
Źródło:
Archives of Foundry Engineering; 2021, 21, 2; 81-88
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study of Optimised Artificial Intelligence Based First Order Sliding Mode Controllers for Position Control of a DC Motor Actuator
Autorzy:
Nyong-Bassey, B. E.
Akinloye, B.
Powiązania:
https://bibliotekanauki.pl/articles/385114.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
adaptive fuzzy control
DC motor position control
genetic algorithm
particle swarm optimization (PSO)
sliding mode control
Opis:
This paper aims at critically reviewing various sliding mode control measures applied to Permanent Magnet DC Motor actuator for position control. At first, a hybrid sliding mode controller was examined with its advantages and disadvantages. Then, the smooth sliding mode controller in the same manner. The shortcomings of the two methods were overcome by proper switch design and also using tanh-sinh hyperbolic function. The sliding mode controller switches on when either disturbance or noise is detected. Genetic Algorithm Computational tuning technique is employed to optimize the gains of the controllers for optimal response.The performance of the proposed controller architecture, as well as the reviewed controllers, have been compared for performance evaluation with respect to several operating conditions. This includes load torque disturbance injection, noise injection in a feedback loop, motor nonlinearity exhibited by parameters variation, and a step change in reference input demand.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 3; 58-71
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Somebody else’s problem? usability in ship bridge design seen from the perspective of different maritime actors
Autorzy:
Danielsen, B. E.
Petersen, E. S.
Powiązania:
https://bibliotekanauki.pl/articles/24201377.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
navigational bridge equipment
ship bridge design
navigational bridge
SOLAS convention
navigational equipment
bridge equipment
maritime actors
different maritime actors
Opis:
Navigation is a complex interaction between human, organizational, environmental, and technological factors on the ship’s bridge. Today, ships bridges include a broad suite of equipment with both digital and analogue interfaces, covering a range of functions and purposes. Suboptimal usability in equipment and interface design as well as layout of the ships bridge has been reported by researchers for decades. This paper aims to contribute to our understanding of why there has been limited progression in usability in ship bridge design over the last decades, by investigating the stakeholders’ different perspectives of their influence, interest and responsibility for usability in ship bridge design. The study is based on interviews with seafarers, shipowners, equipment manufacturers, shipyard, insurance companies, classification societies and a flag state. Usability in navigational equipment and systems on a ship’s bridge is required by the International Maritime Organization (IMO) SOLAS Regulation V/15. We find that this goal-based requirement is challenging to follow up both in design, development, and survey work. To achieve usability in maritime equipment and bridge systems ideally requires the actively involvement of end-users throughout the design and development process. We find that the seafarers, the direct end-users, do not have a clear voice in the ship bridge and bridge equipment design and the associated purchasing processes. The other stakeholders appear to recognize the existing shortcomings, and some do show interest in improvements, but the responsibility for usability seem to be fragmented, and they see the potential solutions as being somebody else’s problem. We conclude by suggesting both long-term and a short-term way forward for improving usability in ship bridge design.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 4; 685--700
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Comparison of Four New ARIMA-ANN Prediction Models on Internet Traffic Data
Autorzy:
Babu, C. N.
Reddy, B. E.
Powiązania:
https://bibliotekanauki.pl/articles/308269.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
ANN
ANN training
ARIMA
Box-Jenkins methodology
hybrid ARIMA-ANN model
Internet traffic forecasting
Opis:
Prediction of Internet traffic time series data (TSD) is a challenging research problem, owing to the complicated nature of TSD. In literature, many hybrids of auto-regressive integrated moving average (ARIMA) and artificial neural networks (ANN) models are devised for the TSD prediction. These hybrid models consider such TSD as a combination of linear and non-linear components, apply combination of ARIMA and ANN in some manner, to obtain the predictions. Out of the many available hybrid ARIMA-ANN models, this paper investigates as to which of them suits better for Internet traffic data. This suitability of hybrid ARIMA-ANN models is studied for both one-step ahead and multistep ahead prediction cases. For the purpose of the study, Internet traffic data is sampled at every 30 and 60 minutes. Model performances are evaluated using the mean absolute error and mean square error measurement. For one-step ahead prediction, with a forecast horizon of 10 points and for three-step prediction, with a forecast horizon of 12 points, the moving average filter based hybrid ARIMA-ANN model gave better forecast accuracy than the other compared models.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 67-75
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Taguchi-Grey Relational Analysis of Gating System Design on Mechanical Properties of Casting
Autorzy:
Ingle, P. D.
Narkhede, B. E.
Powiązania:
https://bibliotekanauki.pl/articles/383260.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
gating system design
aluminum casting
Taguchi technique
Grey Relational Analysis
GRA
właściwości mechaniczne
stopy aluminium
techniki Taguchi
Gray Relational Analysis
Opis:
Throughout the casting process, mold filling plays a very significant role in the casting quality control. It is important to study the effect of gating system design on ingate velocity of the metal which affects the mechanical properties of casting. The effect of varying the design of four gating system elements namely pouring cup, sprue height, runner and ingate design on the multiple responses like tensile strength and percentage elongation is studied using a Taguchi’s L9 OA. The Taguchi technique was coupled with a Grey Relational Analysis (GRA) to obtain a Grey Relational Grade (GRG) for evaluating multiple responses. ANOVA has been applied to identify the significance of different parameters and it was found that the pouring cup design and the runner cross-section along its length collectively contributed above 76% of the total GRG value. Finally, the confirmation tests were performed to validate the predicted optimized results and it established an improvement of 9.90% from the initial design.
Źródło:
Archives of Foundry Engineering; 2019, 3; 72-77
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw temperatury przygotowania ekstraktow herbaty bialej na sklad flawan-3-oli i ich oddzialywanie na dostepnosc skladnikow odzywczych z pasztetu miesnego
The impact of preparation temperature of white tea extracts on the composition of flavan-3-ols and their interaction with the digestibility of nutrients contained in meat pate
Autorzy:
Mika, M
Borczak, B E
Wikiera, A
Powiązania:
https://bibliotekanauki.pl/articles/826562.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
pasztety wieprzowe
bialko
lipidy
weglowodany
strawnosc bialka
strawnosc tluszczu
herbata biala
ekstrakty herbaciane
temperatura
polifenole
trawienie
Opis:
Badano wpływ temperatury ekstrakcji herbaty białej na skład flawan-3-oli. W ekstraktach wodnych herbaty białej przygotowanych w temperaturze: 40°C , 60°C , 70°C , 80°C , 100°C oznaczono zawartość flawan-3-oli (EGCG, ECG, EC, GCG, CG, C). Wysoka temperatura ekstrakcji (80 i 100°C ) generowała reakcję epimeryzacji, czyli przejścia (-) epi-form (2R, 3R) w (-) formy (2S, 3R). Następnie sprawdzano wpływ ekstraktów herbaty białej na strawność białek, węglowodanów i lipidów pasztetu wieprzowego. Strawność związków odżywczych badano metodą in vitro symulującą układ trawienny człowieka. Stwierdzono, że dodatek ekstraktów przygotowanych w różnej temperaturze powodował zmniejszenie ilości uwalnianych do dializatu produktów hydrolizy badanych związków odżywczych. Proces epimeryzacji dodatkowo intensyfikował zmniejszenie strawności lipidów.
The impact of white tea extraction temperature on the composition of flavan-3-ols was investigated. In the water extracts of white tea, prepared at 60°C , 70°C , 80°C , and 100°C , the contents of flavan-3-ols (EGCG, ECG, EC, GCG, CG, C) were determined. The high temperature of extraction (80°C , 100°C) generated an epimerization reaction, i.e. the conversion of (-) epi-forms (2R, 3R) into (-) forms (2S, 3R). Next, the impact of white tea extracts on the digestibility of proteins, saccharides, and lipids in pork pâté was studied The digestibility of nutrients was investigated using an in vitro method simulating human digestive system. It was found that the addition of extracts prepared at different temperatures to the pork pâté caused the amount of nutritive compounds being released to the dialyzate of the hydrolysis products of the nutrients studied to decrease. The epimerization process intensified additionally the decrease in the digestibility of lipids.
Źródło:
Żywność Nauka Technologia Jakość; 2008, 15, 3; 123-131
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Vanadium Microaddition on the Strength of Low-Carbon Cast Steel at Elevated Temperatures
Autorzy:
Kalandyk, B. E.
Zapała, R. E.
Pałka, P.
Powiązania:
https://bibliotekanauki.pl/articles/946865.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low-carbon cast steel
microaddition elements
mechanical properties
temperature
staliwo niskowęglowe
elementy mikrododycji
właściwości mechaniczne
temperatura
Opis:
The effect of vanadium microaddition on the strength of low-carbon cast steel containing 0.19% C used, among others, for castings of slag ladles was discussed. The tested cast steel was melted under laboratory conditions in a 30 kg capacity induction furnace. Mechanical tests were carried out at 700, 800 and 900°C using an Instron 5566 machine equipped with a heating oven of ± 2°C stability. Non-standard 8- fold samples with a measuring length of 26 mm and a diameter of 3 mm were used for the tests. It has been shown that, compared to cast steel without vanadium microaddition, the introduction of vanadium in an amount of 0.12% to unalloyed, low carbon cast steel had a beneficial effect on the microstructure and properties of this steel not only at ambient temperature but also at elevated temperatures when it promoted an increase in UTS and YS. The highest strength values were obtained in the tested cast steel at 700°C with UTS and YS reaching the values of 193 MPa and 187.7 MPa, respectively, against 125 MPa and 82.8 MPa, respectively, obtained without the addition of vanadium. It was also found that with increasing test temperature, the values of UTS and YS were decreasing. The lowest values of UTS and YS obtained at 900°C were 72 MPa and 59.5 MPa, respectively, against 69 MPa and 32.5 MPa, respectively, obtained without the addition of vanadium.
Źródło:
Archives of Foundry Engineering; 2020, 20, 2; 79-83
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Y2O3 Nanoparticles on Corrosion Study of Spark Plasma Sintered Duplex and Ferritic Stainless Steel Samples by Linear Sweep Voltammetric Method
Autorzy:
Shashanka, R.
Chaira, D.
Kumara Swamy, B. E.
Powiązania:
https://bibliotekanauki.pl/articles/351754.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
duplex stainless steel
pitting corrosion
spark plasma sintering
linear sweep voltammetry
ball milling
Opis:
The microstructure and corrosion properties of spark plasma sintered yttria dispersed and yttria free duplex and ferritic stainless samples were studied. Spark plasma sintering (SPS) was carried out at 1000°C by applying 50 MPa pressure with holding time of 5 minutes. Linear sweep voltammetry (LSV) tests were employed to evaluate pitting corrosion resistance of the samples. Corrosion studies were carried out in 0.5, 1 and 2 M concentration of NaCl and H2SO4solutions at different quiet time of 2, 4, 6, 8 and 10 seconds. Yttria dispersed stainless steel samples show more resistance to corrosion than yttria free stainless steel samples. Pitting potential decreases with increase in reaction time from 2 to 10 seconds. Similarly, as concentration of NaCl and H2SO4 increases from 0.5 M to 2 M the corrosion resistance decrements due to the availability of more Cl¯ and SO42¯ ions at higher concentration.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 749-763
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of metallic contamination in sediment and mullet fish (Mugil cephalus Linnaeus, 1758) tissues from the East Algerian coast
Ocena zanieczyszczenia metalami osadów i tkanek cefala pospolitego (Mugil cephalus Linnaeus, 1758) ze wschodniego wybrzeża Algierii
Autorzy:
Ouali, N.
Belabed, B. E.
Zeghdoudi, F.
Rachedi, M.
Powiązania:
https://bibliotekanauki.pl/articles/292672.pdf
Data publikacji:
2018
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
fish
heavy metals
sediment
toxicity
water depth
głębokość wody
metale ciężkie
osad
ryby
toksyczność
Opis:
The present work was designed to assess the contamination level in the coastal of Annaba, following the spectrophotometric determination of the level of some metallic elements (Fe, Cu, Pb, Zn, Ni and Cd) in the sediments along an increasing bathymetric gradient (10 m and 20 m), as well as in the biological indicator grey mullet (Mugil cephalus) muscle. During the winter period (2014), 12 surface sediment samples, and a total of 24 fish were collected. Once the samples are dried, crushed and sieved, 0.5 g dry weight of each sample was added to concentrated acids. The results showed that the levels of some metals are superior to the recommended guideline values, and consequently the sediment of this bay is contaminated by iron, lead and copper. The contamination index (CI) showed a general tendency in the concentration of the studied metals as follows: Fe > Pb > Cu > Zn > Ni > Cd, since the most studied metals occurred at higher concentration in depth (20 m). However, the average concentrations of metals in fishes were found to be as the following order: Fe > Zn > Pb > Cu > Ni > Cd. The consumption of fish from some contaminated sites can be dangerous because concentrations of lead, cadmium and zinc exceed the international standards. Moreover, the strong positive correlation observed between the metallic elements of sediments and fishes confirm that these metals resulted from the similar sources of the anthropic activities, such as domestic, port, industrial and agricultural waste discharges. This is confirmed by the determined of pollution load index (PLI) parameter. Conclusively, a regular monitoring program of heavy metal is recommended for protecting these organisms, and to reduce the environmental risks.
W pracy oceniono poziom zanieczyszczenia strefy przybrzeżnej w okolicach Annaby na podstawie spektrofotometrycznych analiz metali (Fe, Cu, Pb, Zn, Ni and Cd) w osadach na różnej głębokości (10 i 20 m) i w mięśniach cefala pospolitego (Mugil cephalus) jako organizmu wskaźnikowego. W okresie zimowym (2014 r.) zebrano 12 próbek osadów powierzchniowych i łącznie 24 ryby. Po wysuszeniu, pokruszeniu i przesianiu próbek do stężonych kwasów dodano 0,5 g suchej masy każdej próbki. Wyniki dowodzą, że stężenie niektórych metali przekracza dopuszczalne normy, a osady w zatoce są zanieczyszczone żelazem, ołowiem i miedzią. Wskaźnik zanieczyszczenia (CI) kształtował się następująco: Fe > Pb > Cu > Zn > Ni > Cd, przy czym większe stężenie większości metali notowano na głębokości 20 m. Średnie stężenie metali w mięśniach ryb układało się natomiast w porządku: Fe > Zn > Pb > Cu > Ni > Cd. Konsumpcja ryb z niektórych skażonych stanowisk może być niebezpieczna, ponieważ stężenie ołowiu, kadmu i cynku przekracza międzynarodowe standardy. Ponadto, silna dodatnia korelacja między stężeniem metali w osadach i w rybach dowodzi, że metale te pochodzą z tych samych antropogenicznych źródeł takich jak zrzuty ścieków bytowych, portowych, przemysłowych i rolniczych. Potwierdza to oznaczony wskaźnik ładunku zanieczyszczeń (PLI). W podsumowaniu zaleca się wdrożenie regularnego programu monitoringu w celu ochrony organizmów wodnych i ograniczenia ryzyka środowiskowego.
Źródło:
Journal of Water and Land Development; 2018, 38; 115-126
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expanding the possibilities of AIS data with heuristics
Autorzy:
Smestad, B.B.
Rødseth, Ø.J.
Asbjjørnslett, B.E.
Powiązania:
https://bibliotekanauki.pl/articles/116611.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Automatic Identification System (AIS)
AIS Data
heuristics
commercial ship data registers
heuristic training
heuristic testing
satellite AIS Data
commercial vessel database
Opis:
Automatic Identification System (AIS) is primarily used as a tracking system for ships, but with the launch of satellites to collect these data, new and previously untested possibilities are emerging. This paper presents the development of heuristics for establishing the specific ship type using information retrieved from AIS data alone. These heuristics expand the possibilities of AIS data, as the specific ship type is vital for several transportation research cases, such as emission analyses of ship traffic and studies on slow steaming. The presented method for developing heuristics can be used for a wider range of vessels. These heuristics may form the basis of large-scale studies on ship traffic using AIS data when it is not feasible or desirable to use commercial ship data registers.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 2; 279-286
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advancements in near-surface seismicreflection acquisition
Autorzy:
Miller, B. E.
Tsoflias, G. P.
Steeples, D. W.
Powiązania:
https://bibliotekanauki.pl/articles/115499.pdf
Data publikacji:
2010
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
near-surface seismology
near-surface seismic refl ection
near-surface seismic acquisition
Opis:
3-D seismic refl ection methods have been established as the predominant seismic method for hydrocarbon exploration. While this is true for exploration scale surveys the same is not yet true for near-surface seismic refl ection investigations. While the benefi ts of employing 3-D methods have been documented they are yet to be fully adopted by the near-surface community. There are a number of reasons for this; primary among them is the labor involved with planting and re-cabling large numbers of geophones. The amount of time and labor involved in these operations has been a direct hindrance for 3-D investigations of the near-surface. To help overcome these limitations The University of Kansas geophysics group has developed a portable, automated seismic data acquisition system, known as the autojuggie. The autojuggie allows for effi cient ultra-shallow seismic imaging and is capable of quickly performing non-invasive, high-resolution 2-D or 3-D seismic surveys by deploying a dense array of geophones.
Źródło:
Challenges of Modern Technology; 2010, 1, 1; 14-18
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Problem with Longtermism
Autorzy:
Hyde, B.V.E.
Powiązania:
https://bibliotekanauki.pl/articles/29433378.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Effective altruism
longtermism
historiosophy
ethical calculus
existential risk
future
William MacAskill
Opis:
Moral circle expansion has been occurring faster than ever before in the last forty years, with moral agency fully extended to all humans regardless of their ethnicity, and regardless of their geographical location, as well as to animals, plants, ecosystems and even artificial intelligence. This process has made even more headway in recent years with the establishment of moral obligations towards future generations. Responsible for this development is the moral theory – and its associated movement – of longtermism, the bible of which is What We Owe the Future (London: Oneworld, 2022) by William MacAskill, whose book Doing Good Better (London: Guardian Faber, 2015) set the cornerstone of the effective altruist movement of which longtermism forms a part. With its novelty comes great excitement, but longtermism and the arguments on its behalf are not yet well thought out, suffering from various problems and entailing various uncomfortable positions on population axiology and the philosophy of history. This essay advances a number of novel criticisms of longtermism; its aim is to identify further avenues for research required by longtermists, and to establish a standard for the future development of the movement if it is to ever be widely considered as sound. Some of the issues raised here are about the arguments for the moral value of the future; the quantification of that value with the longtermist ethical calculus – or the conjunction of expected value theory with the ‘significance, persistence, contingency’ (SPC) framework; the moral value of making happy people; and our ability to affect the future and the fragility of history. Perhaps the most significant finding of this study is that longtermism currently constitutes a shorterm view on the longterm future, and that a properly longterm view reduces to absurdity.
Źródło:
Ethics in Progress; 2023, 14, 2; 130-152
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przejście do statusu zatrudnionego na pełny etat: analiza empiryczna z wykorzystaniem dwurównaniowego i trójrównaniowego modelu probitowego z endogenicznym przełączaniem
Autorzy:
A, Natalia N E H R E B E C K
Powiązania:
https://bibliotekanauki.pl/articles/701591.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Ekonomista; 2011, 2
0013-3205
2299-6184
Pojawia się w:
Ekonomista
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition, antioxidant and antimicrobial activities of Moroccan species of Psidium guajava extracts
Autorzy:
Lahlou, J.
Amraoui, B.E.
El-Wahidi, M.
Bamhaoud, T.
Powiązania:
https://bibliotekanauki.pl/articles/2082864.pdf
Data publikacji:
2022
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
antibacterial activity
antifungal activity
polyphenol
medicinal plant
essential oil
Opis:
Background. During the recent years, appropriate attention has been paid to the oxidative stress which damages the body’s cells, proteins, and DNA. Therefore, the need of antioxidants becomes a therapeutic and preventive priority. In addition, microbial infections also constitute a public health problem. Objective. To find efficient, reliable and safe alternatives sources to synthetic antioxidants, antibiotics and antifungals drugs. Materials and methods. Extract and essential oil of Psidium guajava were screened for their antioxidant and antimicrobial activities against gram positive bacteria (Enterococcus faecalis and Staphylococcus aureus), gram negative bacteria (Citrobacter freundii, Escherichia coli and Pseudomonas sp) and fungi (Candida albicans,Candida tropicalis and Cryptococcus neoformans), as well as to determine the functional groups of phytochemicals present in the essential oil by Fourier transform infrared spectroscopy (FTIR). Results. The results indicate that P. guajava leaves extract demonstrated very high antioxidant activity and P.guajava essential oil showed the highest polyphenols content. The antioxidant capacity showed a significant negative linear correlation to total polyphenolic content (TPC) with Pearson’s correlation coefficients. P. guajava essential oil shows high antibacterial and antifungal activity against all the studied bacteria and fungi.The FTIR analysis of P. guajava essential oil showed the presence of several functional groups (ethers, esters, ketones, terpenes, alkanes, aldehydes, aromatic hydrocarbons, alcohols, and phenols). The relationship between the chemical composition and antimicrobial activity of P.guajava essential oil suggests that the attribution of its antimicrobial activity to a particular compound or a synergistic effects between its different constituents remains difficult. Conclusions. The present study demonstrated that Psidium guajava is a valuable source of active compounds with anti- oxidant and antimicrobial activities. This finding suggests the new use of the fruits and the leaves extracts of this plant in the treatment of bacterial and fungal infections, as well as for the extraction of new antioxidants. Therefore, it is necessary to be carried out in another study to identify the active(s) compound(s) in P.guajava essential oil with respect to their mechanisms and synergistic actions.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2022, 73, 1; 65-77
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The GSI Heavy Ion Microbeam: A Tool for the Investigation of Cellular Response to High LET Radiations
Autorzy:
Barberet, Ph.
Heiss, M.
Du, G.
Fischer, B. E.
Taucher-Scholz, G.
Powiązania:
https://bibliotekanauki.pl/articles/2044671.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.Ak
87.50.-a
Opis:
Since the mid 1990's, an increasing number of charged particle microbeams have been designed to deliver a preset number of ions to individual living cells with the micron resolution. These tools provide a powerful technique to investigate the cellular response to low doses of radiations. During the last years, the single ion hit facility in operation on the GSI microbeam since 1987 has been upgraded for the irradiation of individual living cells in vitro. This setup presents two main peculiarities compared to the microbeams used up to now for cell irradiation. First, the beam's micrometric size is obtained by magnetic focusing and not by a simple collimation. This allows obtaining a smaller beam spot, a better defined linear energy transfer, and a high irradiation throughput. Then, the GSI microbeam is able to focus ions from carbon to uranium with energies between 1.4 MeV/u to 11.4 MeV/u. The range of accessible linear energy transfer is thus considerably extended compared to light ions microbeam in operation today. The design of the GSI microbeam is described, including the beam control, the online cell localisation, the cell dish designed specifically for microbeam irradiation, and the cell irradiation procedures. Experimental tests performed to check the global aiming accuracy as well as the first cellular irradiations are presented.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 329-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical properties and fatty acid composition of Lagneraria siceraria seed oil
Autorzy:
Magu, T. O.
Sunday, E. A.
Louis, H.
Upla, P. U.
Ukpanah, M. A.
Nyong, B. E.
Powiązania:
https://bibliotekanauki.pl/articles/1118076.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cucurbitaceae
Lagenaria siceraria
Linoleic acid
fatty acid
seed oil
Opis:
Oil was extracted from the dehulled seeds of Lagneraria siceraria (bottle gourd) and analysed for physico-chemical properties, as well a fatty acid composition. Standard procedures were employed in all analysis. The seed oil was liquid at room temperature with percentage yield (23.65%). The oil was characterized in terms of specific gravity (0.918 g/cm3), refractive index (1.34), viscosity (26.46 X 103 poise), melting point (11-14.5 °C), moisture content (0.18%), saponification value (203.36 mg KOH/g), unsaponifiable matter (7.13%), iodine value (46.1 g/100g), peroxide value (7.5 meq/kg), free fatty acid value (18.42%), acid value (60.02 mg KOH/g) and ester value (143.34 mg KOH/g). It was also classified as non- drying (iodine value ˂115 g/100 g). The peroxide value indicates that the oil is less prone to rancidity with iodine value less than 30meq/kg. The high saponification value qualifies it for use in the manufacture of soaps and shampoos. Four classes of fatty acid were identified in the oil: palmitic acid (C16:1) (13.5 ± 0.21), stearic acid (C18:1) (6.5 ± 0.96), oleic acid (C18:1) (11.6 ± 0.62) and linoleic acid (C18:2) (68.4 ± 0.13). Linoleic acid was the most abundant fatty acid in the oil. The fatty acid content of the oil reveals that L. Siceraria seed oil could be a rich source of oil for domestic and industrial purposes if exploited.
Źródło:
World News of Natural Sciences; 2017, 10; 70-79
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence and antimicrobial susceptibility of Klebsiella pneumoniae isolated from hospitalized patients at General Hospital, Etim Ekpo, Akwa Ibom State, Nigeria
Autorzy:
Anosike, I. Kelechi
Edet, U. Okon
Umoafia, G. E.
Agbo, B. E.
Ejelonu, V. O.
Onyesoro, V.
Powiązania:
https://bibliotekanauki.pl/articles/1030832.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antibiotic susceptibility
Klebsiella pneumonia
Nosocomial
Prevalence
Resistance
Opis:
Klebsiella pneumoniae (KP) was investigated in respondents presenting signs and symptoms of urinary tract infection (UTI) in a rural community. Using simple random sampling, a total of 360 respondents (144 males and 216 females) were recruited into the study following informed consent and ethical approval. Mid-stream urine samples were collected from all the respondents aseptically using standard protocol. Isolation of K. pneumoniae was done using morphological characteristics and various biochemical tests while antibiotic sensitivity testing using various antibiotics was done using guidelines of Clinical and Laboratory Standard Institute. A total of 16 samples gave positive culture representing an overall prevalence of 4.4%. Furthermore, prevalence rates of 2.8%, 5.6%, 47.82%, 4.9%, 3.50%, and 8.60% for males, females, diabetics, in-patients, out-patients, and respondents above 60 years of age respectively were obtained. Resistance to antibiotics ranged from 37.50 to 56.25% for gentamycin and nalidixic, and tarivid, respectively. There is need for preventive measures aimed at sensitization of dwellers in community settings.
Źródło:
World Scientific News; 2020, 145; 222-233
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Relationship Between Shift Work Schedules and Spillover in a Sample of Nurses
Autorzy:
Kunst, J. R.
Lrset, G. K.
Hosry, D.
Bjorvatn, B.
Moen, B. E.
Magerry, N.
Pallesen, S.
Powiązania:
https://bibliotekanauki.pl/articles/90710.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
work–family spillover
nurse
strain
stress
rotating shift
shift work
personel pielęgniarski
stres
praca zmianowa
obciążenie
Opis:
The aim of the present study was to estimate spillover effects between the work and the family sphere in a sample of nurses (N = 2058). Hierarchical regression analyses investigated whether shift work schedules were associated with negative or positive spillover, both from family to work and vice versa, controlling for demographic factors, job demands and decision latitude. With daytime work as a reference group, all types of shift work (day and evening shift, night shift only and rotating 3 shift) were associated with higher negative work–to–family spillover.Night work was associated with significantly less negative family–to–work spillover. None of the different shift work schedules were related to any type of positive spillover. The results indicate that working outside of daytime hours is less compatible with workers’ family lives, compared to working ordinary day shifts. On the other hand, working night shifts only was associated with reduced negative family–to–work spillover.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 139-147
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High prevalence of immunoglobulin E [IgE] sensitization among sisal [Agave sisalana] processing workers in Tanzania
Autorzy:
Kayumba, A V
Van-Do, T.
Florvaag, E.
Bratveit, M.
Baste, V.
Mashalla, Y.
Eduard, W.
Moen, B.E.
Powiązania:
https://bibliotekanauki.pl/articles/51120.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
skin prick test
sisal processing
sisal
Tanzania
total immunoglobulin E
sensitization
allergy
immunoglobulin E
respiratory symptom
Agave sisalana
Źródło:
Annals of Agricultural and Environmental Medicine; 2008, 15, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhibition studies of Spondias mombin L. in 0.1 HCl solution on mild steel and verification of a new temperature coefficient of inhibition efficiency equation for adsorption mechanism elucidation
Autorzy:
Magu, T. O.
Bassey, V. M.
Nyong, B. E.
Obono, O. E.
Nzeata-Ibe, N. A.
Akakuru, O. U.
Powiązania:
https://bibliotekanauki.pl/articles/1118802.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Corrosion
Freundlich adsorption isotherm
Inhibition coefficient
Inhibitor
Spondias mombin
Opis:
This research investigated the inhibition behavior of Spondias mombin leaf (SML) extracts in 0.1 M HCl solution on mild steel at various concentrations and temperatures. The result reveals that the inhibition efficiency of the extract on the mild steel sheet increases with increasing concentration of the extract and decreases with increase in temperature. Therefore, the adsorption mechanism of the extract on the mild steel surface is physical. Calculated Correlation Coefficient (R2) values show that the process follows a Freundlich adsorption isotherm. The proposed temperature coefficient equation of adsorption mechanism was found to be appropriate.
Źródło:
World News of Natural Sciences; 2017, 8; 15-26
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trichinellosis of animals in Georgia
Włośnica zwierząt w Gruzji
Trikhinellez zhivotnykh v Gruzii
Autorzy:
Kurashvili, B.E.
Rodonaja, T.E.
Matsaberidze, G.V.
Gurchiani, K.R.
Savateeva, I.A.
Japaridze, Z.A.
Petrashvili, I.I.
Powiązania:
https://bibliotekanauki.pl/articles/2177512.pdf
Data publikacji:
1970
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1970, 16, 1; 76-77
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epidemiology of tree-hole breeding mosquitoes in the tropical rainforest of Imo State, South-East Nigeria
Autorzy:
Anosike, J C
Nwoke, B.E.B.
Okere, A.N.
Oku, E.E.
Asor, J.E.
Emmy-Egbe, I.O.
Adimike, D.A.
Powiązania:
https://bibliotekanauki.pl/articles/50771.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
ecology
South-East Nigeria
yellow fever
mosquito
epidemiology
tree hole
Nigeria
human disease
Imo State
forest reserve
disease vector
rural area
tropical region
Opis:
The study of tree-hole breeding mosquitoes was carried out in the tropical rainforest of Imo State Nigeria (two rural areas and two forest reserves in some parts of Orlu Senatorial Zone) between May – October 2002. Using standard entomological procedures, two macrohabitats (natural tree-holes and bamboo traps) and two microhabitats (leaf axils of cocoyams/pineapples and leaf axils of plantain/banana) were sampled for various mosquito species. Mosquitoes were recovered from all the various biotypes sampled. Types of mosquitoes species encountered, their relative abundance, as well as genera varied signifi cantly during the study (p<0.05). Four genera of mosquitoes: Aedes, Culex, Anopheles and Toxorhynchites were recovered while 16 species of mosquitoes encountered include: Aedes aegypti, Ae. africanus, Ae. simpsoni, Ae. albopictus, Ae. stokesi, Ae. taylori, Ae. apicoargenteus, Culex quinquefasciatus, Cx. nebulosus, Cx. trigripes, Cx. decens, Anopheles gambiae, An. funiestus, An. coustani and Toxorhynchites viridibasis. Most of the mosquitoes showed oviposition preferences for one or more habitats. The presence of Ae. africanus, Ae. simpsoni and Ae. aegypti indicate that the study areas were at risk of yellow fever epidemic. The presence of Anopheles and Culex species ensured endemicity of malaria and fi lariasis, while the recovery of Ae. albopictus in this region suggests a possible outbreak of dengue fever in future if not properly controlled.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of instructional materials in physical education to enhance the students’ knowledge and skills in swimming and life-saving techniques
Autorzy:
Germo, R. R.
Sarinas, B. G. S.
Coo, E. C.
Teruñez, M. R.
Gavadan, B. E.
Jardenil, C. Y.
Flores, J.R.P.V.
Powiązania:
https://bibliotekanauki.pl/articles/2172495.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime education and training
physical education
instructional materials
swimming techniques
life saving techniques
bachelor of Science in marine transportation
life saving appliances
Opis:
John B. Lacson Foundation Maritime University (Arevalo), Inc. is mandated to offer aquatic-sports courses such as paddling, rowing, sailing, and swimming to equip students with needed skills essential for survival in case of emergencies. Since, there is a dearth of instructional materials in Physical Education 2 (Advanced Swimming and Life-saving Techniques), the JBLFMU-Arevalo was given a research grant by the CHED (Commission on Higher Education) known as DARE TO (Discovery Applied Research and Extension Trans/Inter-Disciplinary Opportunities) to address the problem. This DARE TO grant aimed to develop instructional materials in PE 2 that will enhance the swimming performance and life-saving techniques of students. That is why the researchers would like to test for the effectiveness of this instructional material in the form of modules over the traditional approach which is lecture in improving the students’ swimming performance and life-saving techniques in terms of their knowledge and skills. This non-equivalent control group under quasi-experimental study was utilized among the BSMT (Bachelor of Science in Marine Transportation) students. A pretest was used to determine swimming performance of the experimental and control groups. An intervention through the use of instructional materials was employed in the experimental group for the whole semester (five months) while the control group was exposed to lecture as a traditional method of instruction. After a semester, the posttest was administered. The statistical tools used were mean, standard deviation, Mann-Whitney test, and Wilcoxon-signed ranks test. The findings of the study revealed that the instructional material is effective in enhancing the swimming performance and life-saving techniques of students both in the aspects of knowledge and skills. Both the experimental and control groups were “Fair” in their knowledge pretest scores but during the posttest, the experimental group was “Good” and the control group was “Fair”. On the other hand, both the experimental and control groups were “Fair” in their skills’ pretest scores but during their posttest, the control group was “Good” while the experimental group was “Excellent”. The experimental group who used the module showed significantly better performance during the posttest both for knowledge and skills compared to the control group who did not use the module (lecture only). The study further showed significant differences in the mean gains between the experimental and control groups after the conduct of pretest and posttest in favor of the experimental group. It can be gleaned from the results that the module can enhance the knowledge and skills in swimming performance and life-saving techniques of the experimental group. It is highly recommended that this module be utilized among maritime schools offering swimming and life-saving courses.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 233--240
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new characterization on Peano continua
Autorzy:
Fraser, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/746931.pdf
Data publikacji:
1972
Wydawca:
Polskie Towarzystwo Matematyczne
Opis:
The article contains no abstract
Źródło:
Commentationes Mathematicae; 1972, 16, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspects of decrease of some soil pathogens of sugar beet by Bacillus subtilis and Streptomycetes
Badanie możliwości ograniczania rozwoju wybranych glebowych patogenów buraka cukrowego przez Bacillus subtilis oraz Promieniowce
Autorzy:
Moliszewska, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/127510.pdf
Data publikacji:
2011
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
sugar beet
biological methods of plant protection
burak cukrowy
biologiczna ochrona roślin
Opis:
Soil-borne pathogens of sugar beet (Beta vulgaris L.) are often responsible for its poor quality and yield loss. Protection against the group of pathogens is possible only in the early stage of plant development, later there is no possibility for application of chemicals into the soil. This is a reason of the importance of biological methods of plant protection as well as the natural occurrence in the soil of some potentially antagonistic microorganisms. In the laboratory experiments some interactions between pathogens and potentially antagonistic microorganisms were tested as well as their influence on the sugar beet seedlings. Pathogens (Aphanomyces cochlioides, Rhizoctonia solani, Fusarium oxysporum and Streptomyces scabies) were isolated from diseased sugar beet root tissues. The antagonists were Bacillus subtilis, Streptomyces griseoviridis and two isolate of streptomycetes A-2003 and II-2003. Antagonistic microorganisms could not or could only slightly limit development of pathogens. The best result was observed in the case of R. solani which was limited by S. griseoviridis. In vitro B. subtilis and S. griseoviridis could decrease also growth of S. scabies. F. oxysporum showed very low pathogenic ability against sugar beet seedlings, but isolates of A-2003 and II-2003 decreased the number of diseased seedlings in the soil inoculated by F. oxysporum. The microorganisms tested as the antagonists did not injury seedlings of sugar beets. The strongest pathogenicity showed A. cochlioides and any one of antagonistic bacteria could not protect the seedlings against it. They also could not protect seedlings against R. solani, but in the case of soil infected by S. scabies they showed the possibility to protect seedlings.
Choroby korzeni buraka cukrowego (Beta vulgaris L.) powodują znaczne obniżenie ilości oraz jakości plonu tej rośliny. Zwalczanie patogenów glebowych ograniczone jest tylko do fazy siewek buraka, w późniejszym czasie nie ma możliwości chemicznej walki z patogenami glebowymi. Dlatego bardzo ważna jest obecność w glebie naturalnych antagonistów mikroorganizmów patogennych. Organizmy antagonistyczne można także wprowadzać sztucznie do środowiska glebowego, co umożliwia rozwój metod biologicznej ochrony roślin. W przeprowadzonych doświadczeniach, w warunkach laboratoryjnych, zbadano wzajemne oddziaływanie, w warunkach in vitro, pomiędzy patogenami otrzymanymi z zainfekowanych korzeni buraka cukrowego: Aphanomyces cochlioides, Rhizoctonia solani, Fusarium oxysporum oraz Streptomyces scabies a potencjalnymi antagonistami: Bacillus subtilis, Streptomyces griseoviridis oraz dwoma wybranymi izolatami promieniowców (A-2003 i II-2003) otrzymanymi z ranek parchowych na korzeniach buraka. Zbadano także ich wpływ na rośliny buraka w infekcyjnym doświadczeniu wazonowym. Stwierdzono, że wpływ antagonistów na rozwój patogenów był niejednakowy. Obserwowano niewielki stopień ograniczenia wzrostu patogenów przez S. griseoviridis i przez B. subtilis, szczególnie w odniesieniu do R. solani. F. oxysporum wykazywał bardzo nikłe właściwości patogenne wobec siewek buraka, a badane promieniowce A-2003 i II-2003 w niewielkim stopniu ograniczały rozwój jego grzybni oraz w odniesieniu do kombinacji kontrolnej zmniejszały liczbę chorych roślin w teście wazonowym. Wykazano, że żaden z potencjalnych antagonistów nie powodował uszkodzeń siewek buraka. Siewki hodowane w wazonach zainokulowanych antagonistami oraz A. cochlioides nie były chronione przed tym patogenem, podobnie jak w przypadku wazonów infekowanych R. solani, natomiast B. subtilis i S. griseoviridis dobrze chroniły siewki przed S. scabies.
Źródło:
Proceedings of ECOpole; 2011, 5, 2; 401-405
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Higher-dimensional weak amenability
Autorzy:
E. Johnson, B.
Powiązania:
https://bibliotekanauki.pl/articles/1220098.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Bade, Curtis and Dales have introduced the idea of weak amenability. A commutative Banach algebra A is weakly amenable if there are no non-zero continuous derivations from A to A*. We extend this by defining an alternating n-derivation to be an alternating n-linear map from A to A* which is a derivation in each of its variables. Then we say that A is n-dimensionally weakly amenable if there are no non-zero continuous alternating n-derivations on A. Alternating n-derivations are the same as alternating Hochschild cocycles. Since such a cocycle is a coboundary if and only if it is 0, the alternating n-derivations form a subspace of $H^n(A,A*)$. The hereditary properties of n-dimensional weak amenability are studied; for example, if J is a closed ideal in A such that A/J is m-dimensionally weakly amenable and J is n-dimensionally weakly amenable then A is (m+n-1)-dimensionally weakly amenable. Results of Bade, Curtis and Dales are extended to n-dimensional weak amenability. If A is generated by n elements then it is (n+1)-dimensionally weakly amenable. If A contains enough regular elements a with $∥a^m∥ = o(m^{n/(n+1)})$ as m → ±∞ then A is n-dimensionally weakly amenable. It follows that if A is the algebra $lip_α(X)$ of Lipschitz functions on the metric space X and α < n/(n+1) then A is n-dimensionally weakly amenable. When X is the product of n copies of the circle then A is n-dimensionally weakly amenable if and only if α < n/(n+1).
Źródło:
Studia Mathematica; 1997, 123, 2; 117-134
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can DIPPR Database be Used for an Estimation of the Speed of Sound? A Case Study of Liquid Hydrocarbons
Autorzy:
Postnikov, E. B.
Powiązania:
https://bibliotekanauki.pl/articles/177811.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed of sound
DIPPR
reduced bulk modulus
internal pressure
Opis:
The paper analyses a possibility of utilising the information which is contained in DIPPR database for a calculation of the speed of sound, which is absent there. As an example, liquid hydrocarbons are considered: n-hexane, 1-hexene, cyclohexane, cyclohexene, benzene, and 1-hexanols, as well as representatives of n-alkanes with various hydrocarbon chain lengths. It is shown that the Brelvi-O’Connell correlation for the reduced bulk modulus, supplied with the correlations for the internal pressure at the normal boiling temperature, results in the values having accuracy comparable with other DIPPR data for the region below the boiling point bounded by the values of the reduced density around pr ≈ 3.5. The source of errors originated from the Brelvi-O’Connell correlation for larger reduced densities is discussed.
Źródło:
Archives of Acoustics; 2016, 41, 4; 713-719
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie modelu LISEM w badaniach naturalnych przekształceń środowiska
The application of LISEM in studies of natural environment transformations
Autorzy:
Kruczkowska, B.
Kolaczkowska, E.
Regulska, E.
Powiązania:
https://bibliotekanauki.pl/articles/87100.pdf
Data publikacji:
2014
Wydawca:
Polska Asocjacja Ekologii Krajobrazu
Tematy:
srodowisko przyrodnicze
przeksztalcenia srodowiska
przeksztalcenia naturalne
gleby
dekompozycja
erozja gleb
model LISEM
Źródło:
Problemy Ekologii Krajobrazu; 2014, 38
1899-3850
Pojawia się w:
Problemy Ekologii Krajobrazu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mg(OTf)2 + ionic liquid – recyclable catalytic system in diels-alder reaction
Autorzy:
Bittner, B.
Milchert, E.
Janus, E.
Powiązania:
https://bibliotekanauki.pl/articles/779322.pdf
Data publikacji:
2010
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
reakcja Dielsa-Aldera
ciecze jonowe
kwasy Lewisa
pochodne norbornenu
Diels-Alder reaction
ionic liquids
Lewis acids
norbornene derivatives
Opis:
A comparative study of Diels-Alder reaction between cyclopentadiene and dimethyl maleate in catalytic system is reported. The catalytic system was formed from ionic liquid which was made of N-hexylpyridinium bis(trifluoromethylsulfonyl)imide and magnesium trifluoromethanesulfonate. The yields, TONs, TOFs and endo:exo ratios were calculated. The optimal catalyst concentration was found in order to obtain the mixture of endo, exo isomers with the highest yields. Moreover recycling of the catalytic system consisting of Mg(OTf)2 (2 mol%) and ionic liquid was performed. The distillation was noticed to be a better product removal method than extraction by organic solvent, taking into consideration both the TON and TOF values.
Źródło:
Polish Journal of Chemical Technology; 2010, 12, 3; 3-5
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości fizyczne bezglutenowego pieczywa chrupkiego
Physical properties of gluten-free crisp bread
Autorzy:
Gondek, E.
Jakubczyk, E.
Wieczorek, B.
Powiązania:
https://bibliotekanauki.pl/articles/796175.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
pieczywo chrupkie
pieczywo bezglutenowe
wlasciwosci fizyczne
wlasciwosci sorpcyjne
zawartosc wody
wspolczynnik dyfuzji wody
pieczywo kukurydziane
pieczywo ekstrudowane
maka ryzowa
maka gryczana
maka z szarlatu
crisp bread
gluten-free bread
physical property
sorption property
water content
water diffusivity coefficient
corn bread
extruded bread
rice flour
buckwheat flour
amaranth flour
Opis:
W pracy badano wpływ składu pieczywa bezglutenowego na jego wybrane właściwości fizyczne. Przedmiotem badań było pieczywo ekstrudowane wyprodukowane na bazie kaszki kukurydzianej bez dodatków oraz pieczywo kukurydziane z dodatkiem mąki ryżowej, gryczanej oraz mąki z nasion amarantusa. Wykazano, że skład ekstrudowanej mieszanki w niewielkim stopniu wpływał na zawartość i aktywność wody uzyskanego pieczywa, jak również na współczynnik ekspansji, który wynosił średnio 152%. Dodatek mąki gryczanej spowodował istotny, prawie dwukrotny, wzrost współczynnika adsorpcji wody. Wskaźnik rozpuszczalności skrobi w wodzie wahał się w przedziale 18,56–24,57% i był najniższy w pieczywie z dodatkiem amarantusa. Pieczywo wzbogacone o dodatek mąki z amarantusa cechowało się też najniższą gęstością pozorną (0,144 g·cm–3) i najwyższą porowatością (94%). Pomiary dynamiki adsorpcji pary wodnej wykazały, że pieczywo kukurydziano-gryczane chłonie wodę najintensywniej spośród badanych. Współczynnik dyfuzji wody pieczywa wyznaczony na podstawie równania Ficka wynosił 4,12–7,02·10–9 m2·s–1 a wilgotność równowagowa wyznaczona z tego równania 18,23–24,24 gH2O·(100 g s.s.)–1.
In this work, the effect of composition of gluten-free bread on its selected physical properties was investigated. The extruded bread of corn grits without additives, the corn crisp bread with addition of rice fl our, buckwheat fl our or amaranth fl our were evaluated. The composition of extrusion blend affected the water content and water activity to a small extent. The similar tendency was observed for expansion index (with its average value of 152%). Water solubility index of starch was in the range from 18.56 to 24.57%, the highest value of WSI was observed for amaranth-corn bread. The bread supplemented with amaranth fl our characterised the lowest apparent density (0.144 g·cm–3) and the highest porosity (94%). The measurements of the water vapour sorption dynamics showed that the moisture absorption ability of buckwheat – corn bread was more intense than observed for other breads. The moisture diffusion coeffi cient determined by solving Fick’s equation was within the range of 4.12–7.02·10–9 m2·s–1 and the equilibrium moisture content (calculated from the same equation) ranged from 18.23 to 24.24 g H2O·(100 g s.s.)–1.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2013, 574
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of fungi and fungus-like organisms in the Horodnianka River in the vicinity of Bialystok, Poland
Autorzy:
Kiziewicz, B.
Zdrojkowska, E.
Gajo, B.
Godlewska, A.
Muszyńska, E.
Mazalska, B.
Powiązania:
https://bibliotekanauki.pl/articles/2143381.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
fungal community
Horodnianka River
landfill
vicinity of Białystok
Polska
Opis:
Studies of fungi and fungus- like organisms in the northeastern Poland have mainly concentrated on running waters in the vicinity of Białystok, including the Horodnianka River. The main objective was to investigate biodiversity of fungi and fungus-like organisms which take part in decomposition of organic matter commonly found in inland waters. To obtain a complete picture of species composition of fungi and fungus-like organisms in running waters we decided to explore representative sites of the Horodnianka River such as Olmonty, Hryniewicze and Horodniany with close localization of landfill. Fungal species were isolated using baiting technique. Baits of onion skin (Alium cepa), hemp-seeds (Cannabis sativa), impregnated cellophane and snake skin (Natrix natrix) were applied to isolate fungi from water of the Horodnianka River. The fungal community consists of 26 species, 10 species of fungi belonging to class Chytridiomycetes (3), anamorphic fungi (6), and Zygomycetes (1). 16 species belong to fungus-like organisms from class Oomycetes. Most of the recognized species have already been found in other running waters. From all the examined habitats the fungi belonging to 26 species of 18 genera Achlya, Alternaria, Aphanomyces, Aspergillus, Catenophlyctis, Dictyuchus, Fusarium, Karlingia, Lagenidium, Leptomitus, Olpidiopsis, Penicillium, Phlyctochytrium, Pythium, Saprolegnia, Scoliognia, Thraustotheca and Zoophagus were obtained. Certain fungal species like Aphanomyces laevis, Fusarium aqueductum, F. moniliforme, F. oxysporum, Leptomitus lacteus, Saprolegnia feax and S. parasitica were found at all the study sites. Among fungi potentially pathogenic and allergogenic for humans the genera Alternaria, Aspergillus, Fusarium, Lagenidium and Penicillium have already been described. However, the species Lagenidium giganteum and Achlya androgyna are new in the fungal biota of Poland. The greatest number of fungal species occurred in Olmonty (24), the smallest in Horodniany (13). Presence of fungi such as Leptomitus lacteus, Fusarium aqueductum in the water of the Horodnianka River offers the possibility of using them as indicators of water quality.
Źródło:
Wiadomości Parazytologiczne; 2011, 57, 3; 159-164
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 2249

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