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Wyświetlanie 1-15 z 7352
Tytuł:
Drying kinetics of dill leaves in a convective dryer
Autorzy:
A. Motevali, A.
Younji, S.
Amiri Chayjan, R.
Aghilinategh, N.
Banakar, A.
Powiązania:
https://bibliotekanauki.pl/articles/25673.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
Thin layer drying characteristics of dill leaves under fixed, semi-fluidized, and fluidized bed conditions were studied at air temperatures of 30, 40, 50, and 60°C. In order to find a suitable drying curve, 12 thin layer-drying models were fitted to the experimental data of the moisture ratio. Among the applied mathematical models, the Midilli et al. model was the best for drying behavior prediction in thin layer drying of dill leaves. To obtain the optimum network for drying of dill leaves, various numbers of multilayer feed-forward neural networks were made and tested with different numbers of hidden layers and neurons. The best neural network feed-forward back-propagation topology for the prediction of drying of dill leaves (moisture ratio and drying rate) was the 3-45-2 structure with the training algorithm trainlm and threshold functions logsig and purelin. The coefficient of determination for this topology for training, validation, and testing patterns was 0.9998, 0.9981, and 0.9990, respectively. Effective moisture diffusivity of dill leaves during the drying process in different bed types was found to be in the range from 7.10 10-12 to 1.62 10-10 m2 s-1. Also, the values of activation energy were determined to be between 75.435 and 80.118 kJ mol-1.
Źródło:
International Agrophysics; 2013, 27, 1
0236-8722
Pojawia się w:
International Agrophysics
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:
Attenuation of ultraviolet irradiance in North European coastal waters
Autorzy:
Aas, E.
Hojerslev, N.K.
Powiązania:
https://bibliotekanauki.pl/articles/48908.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
attenuation
coastal water
fjord
salinity
Europe
optical property
ultraviolet irradiance
Opis:
A total of 439 measurements of downward ultraviolet irradiance in North European coastal waters have been analysed,half of which have been taken from other authors. The depths Z(10%) where the irradiance is reduced to 10% of its surface value vary by one order of magnitude in the open coastal waters,b oth at wavelengths of 310 nm (0.3–10.4 m) and 380 nm (1.2–13.0 m). In the fjords and estuaries the depth ranges are reduced to 0.08–6.1 m at 310 nm and 0.18–7.7 m at 380 nm. Mixing with saline ocean waters can increase these light penetration depths to more than 10 m,while river water can reduce them to a few centimetres.
Źródło:
Oceanologia; 2001, 43, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical water types of the Nordic Seas and adjacent areas
Autorzy:
Aas, E.
Hojerslev, N.K.
Hokedal, J.
Sorensen, K.
Powiązania:
https://bibliotekanauki.pl/articles/47844.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Arctic Sea
Baltic Sea
Barents Sea
Nordic Sea
optical classification
adjacent area
surface layer
weather condition
coastal water
irradiance
Źródło:
Oceanologia; 2013, 55, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges for managing non-technological innovation : a case from Malaysian public sector
Wyzwania dotyczące zarządzania pozatechnologicznymi innowacjami : przypadek malezyjskiego sektora publicznego
Autorzy:
Ab Rahman, Z. N.
Ismail, N.
Rajiani, I.
Powiązania:
https://bibliotekanauki.pl/articles/405375.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska
Tematy:
innovative culture
resources
collaboration
non-technological innovation
kultura innowacyjna
odpowiednie zasoby
współpraca
pozatechnologiczne innowacje
Opis:
The Malaysian government has encouraged public sectors to adopt innovation to create value added that will increase their wealth creation and to enhance their competitive advantage. There are many initiatives have been put forward to encourage the innovative activities, nonetheless, the efforts are rather less fruitful. Thus, this paper aims to discuss the challenges faced in managing non-technological innovation in the organization and suggest ways for improvement particularly in Malaysian public sectors. For that purpose, seven interviewees have been chosen to be interviewed using semi-structured questions from two categories; facilitator and implementer. Thematic approach is implemented to analyse the data collected. This study has identified three critical challenges, which include innovative culture, inadequate resources and lack of collaboration with other institutions.
Rząd Malezji zachęcał sektory publiczne do przyjmowania innowacji w celu tworzenia wartości dodanej, która zwiększy ich dobrobyt i wzmocni przewagę konkurencyjną. Podjęto wiele inicjatyw zachęcających do innowacyjnych działań, jednak uzyskane wyniki nie są najlepsze. Niniejszy artykuł ma na celu omówienie wyzwań stojących przed zarządzaniem pozatechnologicznymi innowacjami w organizacji oraz zaproponowanie sposobów na poprawę aktualnego stanu, szczególnie w malezyjskich sektorach publicznych. W tym celu wybrano siedem osób, z którymi przeprowadzono wywiady, z wykorzystaniem półstrukturalnych pytań z dwóch kategorii; moderator i realizator. W celu analizy zebranych danych wdrożono podejście tematyczne. W badaniu wskazano trzy kluczowe wyzwania, które obejmują innowacyjną kulturę, nieodpowiednie zasoby oraz brak współpracy z innymi instytucjami.
Źródło:
Polish Journal of Management Studies; 2018, 17, 1; 7-16
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of annealing and anisotropic behaviour on tensile and fatigue properties of AA 8090
Autorzy:
Abass, M. H.
Mahmud, F.
Alali, M. S.
Abood, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/378497.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
AA 8090
anisotropic behavior
annealing
tensile strength
fatigue strength
AA8090
zachowanie anizotropowe
wyżarzanie
wytrzymałość na rozciąganie
wytrzymałość zmęczeniowa
Opis:
Purpose: This paper aims to assess microstructures and mechanical properties of annealed and un-annealed Al-Li alloys (AA8090) and provide valid information regarding influence of anisotropy on tensile properties, fatigue lives. Design/methodology/approach: The methodology included investigating the influence of annealing on grain size, tensile strength and fatigue lives of AA8090. Optical microscope, scanning electron microscope and X-ray diffraction were utilized to analyse the crystallographic texture. Findings: The results showed that the un-annealed alloy exhibited much finer grain structure in three directions, namely longitudinal (L) rolling direction, L-45° and Long transverse (LT) combined with stronger crystallographic texture. Regarding to mechanical properties, un-annealed alloy presented superior tensile strength with strong anisotropic behaviour. L and LT grains direction showed highest tensile strength value of 550 MPa and L-45° showed lowest tensile strength value of 420 MPa. Results of fatigue test revealed that annealed Al-Li alloy has lower fatigue lives with high influence of test direction on fatigue properties. Higher variation in fatigue life to failure links with un-annealed alloy over annealed alloy. Examination of fractured surface showed that the morphology of fractured surface is a mixture of ductile and brittle fractures in both annealed and un-annealed alloys with more brittle behaviour in un-annealed alloy. Research limitations/implications: The main challenge of this work is the determination of the test direction (test angle in respect to rolling direction), which is necessary to provide correct information regarding mechanical properties. Further study of low cycle fatigue can be done in future, which will be an excellent indication to mechanical properties of this alloy since it provides more understanding to the behaviour of the material and better comprehend crack propagation and strain stress concentration. Practical implications: AA8090 alloy is an important candidate for aerospace and aircraft industries. Influence of annealing heat treatment and rolling direction on mechanical properties of AA8090 alloy provides more accurate information to the manufacturers who deal with this alloy. Originality/value: This study is affording a significant information regarding the effect of annealing and anisotropic behaviour on mechanical properties of AA8090. To our knowledge, there are few reports that study this combination of factors on AA8090 alloy.
Źródło:
Archives of Materials Science and Engineering; 2019, 99, 1/2; 5-12
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Release and Microstructure of $MgH_{2}$ Based Composite Powders Containing a Relevant Amount of $LaNi_{5}$
Autorzy:
Abazović, N.
Aurora, A.
Contini, V.
Mancini, M.
Montone, A.
Vittori Antisari, M.
Powiązania:
https://bibliotekanauki.pl/articles/1538131.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.82.Bg
65.40.-b
68.37.Hk
Opis:
Micro-composite materials based on $MgH_{2}$ with the addition of a relevant amount of $LaNi_{5}$ have been synthesized by reactive ball milling. The powder microstructure has been studied by a combination of X-ray diffraction and scanning electron microscopy, while the decomposition behaviour and the hydrogen release properties have been obtained by differential thermal analysis and thermo-gravimetric measurements. Both temperature scans and constant temperature isotherms have been used to this purpose. Experimental results allow identifying optimum processing condition for synthesis of material that shows the onset of hydrogen release at temperatures as low as 450 K. The decomposition kinetics has been studied by isothermal measurements which show that the whole process cannot be described by just one mechanism limiting the reaction velocity. In fact in the first decomposition step the reaction is kinetically limited by the second phase nucleation, while, for partially decomposed samples the bulk diffusion appears to limit the process. On the basis of the experimental results we propose a mechanism of phase transformation where a percolating network of the two phases is formed.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 841-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of hepatitis B virus infection among barbers and their knowledge, attitude and practices in the district of Sukkur, Sindh
Autorzy:
Abbasi, Imran N.
Fatmi, Zafar
Kadir, Muhammad M.
Sathiakumar, Nalini
Powiązania:
https://bibliotekanauki.pl/articles/2178888.pdf
Data publikacji:
2014-10-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
hepatitis B
barbers
peri-urban
Sukkur
knowledge
attitude and practices
Opis:
Objectives: Several occupations in developing countries lag behind in ensuring the safety of their workers in occupational settings. Lack of implementation of safety guidelines at workplaces can expose workers to health risks. In Pakistan, barbers are one of the un-regulated occupational groups. Low literacy, increased frequency of direct skin contact and blade/razors use can expose barbers to body fluids including blood of the customers. We conducted this study in order to determine hepatitis B virus (HBV) prevalence among barbers and their knowledge, attitude and practices in a peri-urban district of Sindh. Material and Methods: Three hundred eighty-five barbers from the Sukkur district were interviewed using a structured questionnaire. Blood samples were collected and tested for HBsAg. A scale was built to determine the proportions of responses to knowledge, attitude and practice items. Results: The prevalence of HBV among barbers was 2.1%. The barbers’ knowledge on HBV and its transmission routes was poor. The response to attitude items was good, except that only 35.1% of the participants agreed to have vaccination against HBV. The overall performance on the knowledge and practice scales was poor compared to the attitude scale on which 80% of the barbers performed well. Conclusion: The prevalence of HBV among barbers was lower compared to the available national figures for the prevalence among the general population.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2014, 27, 5; 757-765
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 7352

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