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Tytuł:
Pomiary i modelowanie stereometrii ziaren ściernych
Measurements and modelling of grinding grain stereometry
Autorzy:
Tomkowska, A.
Bałasz, B.
Powiązania:
https://bibliotekanauki.pl/articles/156398.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pomiary ziaren ściernych
modelowanie
grinding grains measurements
grains modeling
Opis:
W artykule opisano nowe metody generowania powierzchni ziarna ściernego. Szczegółowo opisano metodę naśladującą naturalne procesy kruszenia ziaren, jako metodę najbardziej zgodną z procesami technologicznymi i łatwą w doborze parametrów stereometrycznych wierzchołków ziaren oraz ich parametrów. Opracowane modele pozwalają opisywać mikrotopografię samego ziarna oraz ukształtowanie jego wierzchołka.
The paper presentss the method of grain stereometry modelling. The grain surface is described by a function whose components determine the grain shape fshape(x,y and its micro-topography (irregularities of the shape) fmtp(x,y). The components of the function are combined in an additive or a multiplicative manner. The models developed have features which enable generation of the grain surface of properties statistically compliant with specified types of grains from different abrasive materials. The models of abrasive grains designed were experimentally verified. Due to the fact that the basic features influencing the nature of the work of the grain are the parameters of the abrasive tool point, a comparative analysis was conducted in order to check the compatibility of the apex angle of the tool point 2e, the radius of the nose radius r of the model grains and the proportion of the height hw of the grain to the width of its base b, in relation to the real grains. The verification process consisted in determining the geometrical parameters of the models of grains generated. The values of the apex angle 2e and of the rounding angle of the vertex r were determined for various penetration depths of the tool point. The verification of the grain shape made it possible to determine the boundary values of the shape coefficients for individual types of grains, owing to which geometrical correctness of the modelled grains was ensured during the simulation process.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 4, 4; 268-271
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of potassium nitrate based solid propellant grains formulation using response surface methodology
Autorzy:
Ogunleye, O O
Hammed, J O
Alagbe, S O
Powiązania:
https://bibliotekanauki.pl/articles/102731.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
propellant grains
specific impulse
grains performance
combustion instability
geometry
Opis:
This study was designed to evaluate the effect of propellant formulation and geometry on the solid propellant grains internal ballistic performance using core, bates, rod and tubular and end-burn geometries. Response Surface Methodology (RSM) was used to analyze and optimize the effect of sucrose, potassium nitrate and carbon on the chamber pressure, temperature, thrust and specific impulse of the solid propellant grains through Central Composite Design (CCD) of the experiment. An increase in potassium nitrate increased the specific impulse while an increase in sucrose and carbon decreased specific impulse. The coefficient of determination (R2) for models of chamber pressure, temperature, thrust and specific impulse in terms of composition and geometry were 0.9737, 0.9984, 0.9745 and 0.9589, respectively. The optimum specific impulse of 127.89 s, pressure (462201 Pa), temperature (1618.3 K) and thrust (834.83 N) were obtained using 0.584 kg of sucrose, 1.364 kg of potassium nitrate and 0.052 kg of carbon as well as bate geometry. There was no significant difference between the calculated and experimented ballistic properties at p < 0.05. The bate grain geometry is more efficient for minimizing the oscillatory pressure in the combustion chamber.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 27; 123-134
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency in Food Grains Production in India Using DEA and SFA
Autorzy:
Mathur, Rajani Neeraj
Ramnath, Swati Raju
Powiązania:
https://bibliotekanauki.pl/articles/14475294.pdf
Data publikacji:
2018-03-15
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
food grains production
food security
Opis:
Aim: Food security is a multi-dimensional issue and is concerned with aspects such as availability, access and utilisation. It would require major interventions that will transform the current patterns and practices of food production, distribution and consumption. Food security can be attained by increasing the level of agricultural productivity and efficiency and improvements in agricultural efficiency are at the core of the quest for food security. This paper seeks to examine the efficiency in food grains production in India for the period 1960-61 to 2013-14.   Design / Research methods: The key idea is to employ the non-parametric Data Envelopment Analysis and the parametric Stochastic Frontier Analysis to measure the efficiency of food grains production in India. We have estimated an input oriented single output, multi – input DEA models (CRS – DEA and VRS- DEA) of agricultural production to measure the efficiency in food grains production for two time periods 1960-61 to 1989-90 and 1991-92 to 2013-14. The analysis of super efficiency was conducted for both these time periods helped identify the years in which food grains production was most efficient.   Conclusions / findings: We find high average efficiency in farming operations for both the frontier methods. However, the range of efficiency obtained varies considerably for the different frontier methods. The period after 1990 has witnessed improved agricultural performance as can be inferred from the frequency distribution of the efficiency scores which indicates that during this period the overall efficiency scores have been higher and there was not a single year in which the efficiency levels have been less than 0.9. The analysis of super efficiency also vindicates the improved performance of the agricultural sector in the post 1990 periods as greater number of years recorded an efficiency score greater than 1 as compared to the previous period. However, the super efficiency scores recorded in the period 1961-1990 were higher than those in the post 1990 years suggesting thereby that there could be a tapering of the positive impact of the Green Revolution. Efficiency estimates obtained by the SFA model are marginally lower than that of the DEA model and the results of the SFA model indicate net sown area, net irrigated area and pesticides to be statistically significant inputs.   Originality / value of the article: This study contributes significantly to the literature on efficiency measurement of agricultural production in India by focussing on efficiency measurement of food grains. Most studies focus on farm level data and /or on individual crops. Implications of the research: This results of this study have implications for the issue of food security in India. Its results indicate that a need to expand irrigation facilities and net sown area to improve efficiency in food grain production which is vital for the issue of food security.
Źródło:
Central European Review of Economics and Management; 2018, 2, 1; 79-101
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on respiratory allergy problems among local people of Serampore sub-division of West Bengal, India during spring season
Autorzy:
Sermin, Salma
Koley, Dipanwita
Ganguly, Ankita
Ghosh, Nandini
Talukdar, Partha
Powiązania:
https://bibliotekanauki.pl/articles/1076640.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ELISA
Pollen grains
allergy
questionnaire
sensitization
Opis:
Allergic over burden increases at an alarming rate worldwide. In India allergy becomes a major health problem from last decade with increasing urbanization. The study is aimed to know the allergic problems among the common people of Serampore sub division of West Bengal, India. A survey was conducted on 100 randomly selected people of the study area. The allergic patients were asked about their time of onset of allergy, duration, symptoms etc. Most of the patients were found to suffer from allergy mostly at spring season. In the study area Moringaoleifera and Buteamonosperma plants were found in large numbers. The antigenic extracts from pollen grains of these plants were prepared and specific IgE against these allergens in the patient sera were determined. Most of the patient showed high IgE titre against the pollen antigen of Moringaoleifera. This is a potent aero-allergen in the study area.
Źródło:
World News of Natural Sciences; 2019, 26; 29-35
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological aspect of creating abrasion resistance of machine elements
Aspekt tribologiczny kształtowania odporności na ścieranie elementów maszyn
Autorzy:
Nosal, S.
Powiązania:
https://bibliotekanauki.pl/articles/335407.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
abrasive wear
abrasion resistance
anchored grains
abrasive grains
zużywanie ścierne
odporność na ścieranie
ziarna umocowane
ziarna ścierne
Opis:
The article presents the share of particular types of tribological wear and losses caused, with particular regard to abrasion. The wear on anchored grains and abrasion by grains between elements in frictional contact were characterized. General postulates regarding the limitation of abrasive wear depending on the conditions of its occurrence have been proposed.
Przedstawiono udział poszczególnych rodzajów zużywania tribologicznego i strat, które powodują, ze szczególnym uwzględnieniem ścierania. Scharakteryzowano zużywanie o ziarna umocowane i ścieranie przez ziarna obecne między trącymi się elementami. Zaproponowano ogólne postulaty dotyczące ograniczania zużywania ściernego w zależności od warunków jego występowania.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2018, 63, 1; 35-39
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron microscopic studies on structure and microflora of kefir grains
Badania nad strukturą i mikroflorą ziarn kefirowych w mikroskopie elektronowym
Autorzy:
Molska, I.
Kocon, J.
Zmarlicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398329.pdf
Data publikacji:
1980
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
kefir grains
lactic acid bacteria
electron microscopy
Opis:
It was found out that participation of lactobacilli, streptococci and yeasts in kefir grailns' microflora amounted to 66, 16 and 18% respectively. Scanning and transmission microscopy revealed that lactic acid bacteria formed microcolonies mainly inside the grains and yeasts at the surface layers.
W pracy określono proporcje pomiędzy różnymi formami morfologicznymi drobnoustrojów występujących w ziarnach kefirowych oraz badano strukturę i budowę ziarn w mikroskopie elektronowym. Przy liczeniu bakterii jako jednostkę traktowano zarówno komórki pojedyncze, jak też dwoinki i łańcuszki, przy liczeniu drożdży - poszczególne komórki. Liczenie komórek w preparatach barwionych sporządzonych z ziarn kefirowych rozpuszczonych w O, 1 N NaOH wykazało, że liczbowo pałeczki stanowiły średnio 66% mikroflory (wahania 62-69%), zierniaki 16%(wahania 11-22%), a drożdże 18% (wahania 16-20%). Obserwacje przeprowadzone w elektronowym mikroskopie skaningowym pozwoliły stwierdzić występowanie na powierzchni ziarn dużych skupień komórek drożdży i pałeczek,. co sugeruje, że rozwijają się one w mikrokoloniach tworzących masę ziarna. Ziarniaki występowały w obrębie tych skupień jako dwoinki i krótkie łańcuszki (rys. 2). W barwionych octanem uranylu ultracienkich skrawkach z ziarn kefirowych obserwowanych w elektronowym mikroskopie transmisyjnym zaobserwowano wewnątrz ziarn głównie komórki bakterii. Drożdże występowały nielicznie, co wskazuje na fakt silniejszego ich rozwoju w powierzchniowych częściach ziarn. Komórki drobnoustrojów zatopione były w bezpostaciowej substancji (rys. 3 i 4).
Źródło:
Acta Alimentaria Polonica; 1980, 06, 3; 145-154
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passerine birds supporting cross pollination in Erythrina stricta Roxb.
Autorzy:
Khanduri, V.P.
Kumar, K.S.
Sharma, C.M.
Riyal, M.K.
Kar, K.
Singh, B.
Sukumaran, A.
Powiązania:
https://bibliotekanauki.pl/articles/2078260.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Ornithophily
pollination
mating system
geitonogamy
pollen grains
Opis:
Erythina stricta is an ecologically important tree species in the rainforests of India and its nectar within the flowers contributes to birds’ diet and survival. Reports on the pollination of this species have not been published so far. We therefore explore the reproductive system of this tree species which has great significance to its ecosystem. Birds have an important role in the reproduction of trees through pollination particularly in tropical areas where reproductive success mostly depends on animal pollinator interactions. Study of visitation and nectar feeding behaviour of birds alongwith breeding system assessment of Erythina stricta. Birds visiting and foraging behaviour was observed during Erythrina stricta flowering season in an indian tropical rainforest. Reproductive system was assessed through controlled pollination experiments. Thirteen bird species were recorded visiting and foraging nectar from the flowers of Erythrina stricta. The maximum numbers of visits recorded were from the Red-vented Bulbul (Pycnonotus cafer, Pycnonotidae). The nectar feeding birds were, either (i) potential pollinator with long bills (e.g. Pycnonotus spp., Chloropsis aurifrons, and Dicrurus spp.) or (ii) nectar robbers with comparatively shorter bills (e.g. Zosterops palpebrosa, Stachyris ruficeps, Macronous gularis, Heterophasia glaciris). Controlled pollination experiments revealed high degree of cross pollination (xenogamy) and self-incompatibility in E. stricta. Birds were more frequent in early mornings and their foraging activity was also observed during evening hours; the frequency however, declined with respect to nectar availability. Long corolla tubes of E. stricta could restrict access to nectar collecting bees
Źródło:
Dendrobiology; 2021, 85; 117-126
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spore-pollen and phytoplankton analysis of the Upper Miocene depositsfrom Józefina (Kraków-Silesia Upland, Poland)
Autorzy:
Worobiec, E.
Gedl, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059037.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Polska
Miocene
palaeoenvironment
stratigraphy
freshwater algae
pollen grains
Opis:
Pollen grains, spores and phytoplankton from the Neogene succession of a borehole at Józefina (northern part of the Kraków–Silesia Upland, Poland) have been studied. The composition of the pollen spectra and the mutual ratio of palaeotropical and arctotertiary elementssuggest a Late Miocene age. Among the pollen grains, there are significant elements characteristic of riparian forests (Pterocarya, Caryaand Liquidambar) and mixed mesophytic forests (Pinus, Fagus and Carpinus). Such a pollen and spore association suggests a temperateand mid-wet climate, cooler than during the Early and Mid Miocene period, but still warmer than the present-day climate of Poland. Thismakes the pollen-spore association from Józefina comparable with XII climatic phase represented by the Carpinipites-Juglandaceaespore-pollen zone. The occurrence of aquatic plants and freshwater algae (e.g., Sigmopollis, Zygnemataceae and desmids) indicates alacustrine palaeoenvironment.
Źródło:
Geological Quarterly; 2010, 54, 1; 41-54
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Workpiece temperature variations during flat peripheral grinding
Autorzy:
Smirnov, V. A.
Repko, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/409773.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
cutting force
cutting grains
flat grinding
temperature variations
Opis:
The paper presents the results of researches of temperature variations during flat peripheral grinding. It is shown that the temperature variations of the workpiece can reach 25...30% of the average values, which can lead to some thermal defects. A nonlinear two-dimensional thermophysical grinding model is suggested. It takes into account local changes in the cutting conditions: the fluctuation of the cut layer and the cutting force, the thermal impact of the cutting grains, and the presence of surface cavities in the intermittent wheel. For the numerical solution of the problem, the method of finite differences is adapted. Researches of the method stability and convergence are made, taking into account the specific nature of the problem. A high accuracy of the approximation of the boundary conditions and the nonlinear heat equation is provided. An experimental verification of the proposed thermophysical model was carried out with the use of installation for simultaneous measurement of the grinding force and temperature. It is shown that the discrepancy between the theoretical and experimental values of the grinding temperature does not exceed 5%. The proposed ther-mophysical model makes it possible to predict with high accuracy the temperature variations during grinding by the wheel periphery.
Źródło:
Management Systems in Production Engineering; 2018, 2 (26); 93-98
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cooling Conditions on a Slabs Chill Zone Formation During Continuous Casting of Steel
Autorzy:
Dróżdż, P.
Powiązania:
https://bibliotekanauki.pl/articles/353638.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
crystallisation
chilled grains
continuous casting of steel
ProCAST
Opis:
The cooling conditions of a slab during continuous casting of steel have an impact on the crystalline structure formation. Numerical methods allow real processes to be modelled. Professional computer programs are available on the market, so the results of their simulations allow us to understand the processes that occur during the casting and solidification of the slab. The study attempts to evaluate the impact of the intensity of the secondary cooling on the chilled zone size. The calculations show the differences in the structure of a slab cast with various speeds while maintaining industrial cooling parameters during operation of a continuous casting machine.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 911-918
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical characteristics of dietary fibre fractions in the grains of tetraploid and hexaploid triticales: a comparison with wheat and rye
Autorzy:
Cyran, Małgorzata
Łapiński, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2199093.pdf
Data publikacji:
2006-12-22
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
arabinoxylans
cereal grains
dietary fibre
nonstarch polysaccharides
viscosity
Opis:
The contents of water-soluble (SDF) and insoluble dietary fibre (IDF) and DF-associated protein, sugar composition of noncellulosic polysaccharides (NCP) as well as viscosity of cereal slurries were investigated in tetraploid (4x) and hexaploid (6x) triticales compared to wheat and rye. The SDF content found in 4x triticale (3.3% of dry matter) was significantly higher (P
Źródło:
Plant Breeding and Seed Science; 2006, 54; 77-84
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena właściwości paliwowych ubocznego produktu z produkcji bioetanolu
Evaluation of fuel properties of by-product from bioethanol production.
Autorzy:
Latkowska, B.
Fitko, H.
Stelmach, S.
Powiązania:
https://bibliotekanauki.pl/articles/401217.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wywar pofermentacyjny
DDGS
spalanie
distillers grains
fuel
combustion
Opis:
W procesie produkcji bioetanolu powstaje stały produkt uboczny, uzyskiwany z tzw. wywaru pofermentacyjnego. Produkt ten wykorzystywany jest najczęściej jako pasza dla zwierząt hodowlanych. Biorąc pod uwagę możliwe problemy z jego wykorzystaniem (zmienna koniunktura na rynku rolno-hodowlanym), a także przewidywany wzrost produkcji bioetanolu, pojawić się może konieczność alternatywnego zagospodarowania tego produktu.Celem wykonanych badań było określenie właściwości paliwowych ubocznego produktu z produkcji bioetanolu dla oceny możliwości jego zastosowania w charakterze paliwa w różnych procesach termicznych.Przeprowadzone badania próbki ubocznego produktu z produkcji bioetanolu wykazały, że materiał ten charakteryzuje się bardzo dobrymi właściwościami paliwowymi. Produkt ten posiada się niską zawartością wilgoci oraz popiołu, a jednocześnie bardzo dużą zawartością części lotnych. Jego wartość opałowa umożliwia jego bezproblemowe, autotermiczne spalanie. Składem elementarnym nie odbiega on zasadniczo od wielu materiałów biomasowych.W świetle wykonanych badań można stwierdzić, że jedną z najlepszych opcji energetycznego zagospodarowania badanego materiału jest jego współspalanie z węglem w istniejących obiektach energetycznych.
During bioethanol production, solid by-product (distillers grains) is generated. This product is mostly used as animal feed. Taking into account possible problems with its use (changes of agriculture market) and anticipated increase in production of bioethanol, the necessity of alternative use of this product may occur.The aim of this study was to determine fuel properties of by-product from bioethanol production to evaluate the capabilities of its use as a fuel in various thermal processes.The studies of the by-product sample showed that this material has a very good fuel properties. This product has a low moisture and ash content, and very high content of volatiles. Its gross calorific value enables seamless, autothermal combustion. Elemental composition of the by-product does not differ substantially from many biomass materials.In the light of the results of tests it can be stated that one of the best options for energy production using examined material is its co-combustion with coal in existing power plants.
Źródło:
Inżynieria Ekologiczna; 2011, 25; 222-230
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palynology of Oligocene lignites in two karst palaeosinkholes at Górażdże, Upper Silesia, Poland
Autorzy:
Worobiec, Elżbieta
Szulc, Joachim
Powiązania:
https://bibliotekanauki.pl/articles/1836250.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
palynostratigraphy
palaeokarst
sinkhole deposits
coal
pollen grains
Palaeogene
Opis:
A palynological analysis was carried out on about 115 samples from two borehole cores, containing the infills of two palaeosinkholes at Górażdże. In both sinkholes, well preserved palynofloras were found in several lignite samples. A total of 54 fossil species, including 5 species of cryptogam spores, 7 species of gymnosperm pollen and 42 species of angiosperm pollen, were identified. No marine palynomorphs or microremains re-deposited from older sediments have been found in these samples. The spore-pollen assemblage made it possible to date the sinkhole deposits. The composition of the assemblage (e.g., abundance of small tricolporate pollen grains of the Fagaceae family, including Cupuliferoipollenites pusillus, Fususpollenites fusus, and Quercoidites microhenricii) indicates that the age of the lignites in both sinkholes is early Oligocene. Thus, the deposits at Górażdże correspond to the 5th Czempiń lignite seam group. The 5th seam occurs mainly in northwestern Poland and its lignites were deposited in isolated wetland basins with marine influences. The terrestrial Górażdże palynoflora without any marine influence shows mainly local early Oligocene vegetation from the surrounding area. The results are also direct evidence of the multiphase palaeokarst of the Silesian-Cracow Upland, including the deposition of lignites of various ages.
Źródło:
Annales Societatis Geologorum Poloniae; 2020, 90, 4; 495-504
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photochemical investigation of elements in Oryza sativa
Autorzy:
McKenzie, Feanna
Verma, Vishwa N.
Powiązania:
https://bibliotekanauki.pl/articles/1192076.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Oryza Sativa
Rice Grains
Human Consumption
Trace Elements
AAS
Opis:
Short white rice grains produced locally from Mahaica, Guyana were collected from the rice farm and analyzed for ten trace elements by flame atomic absorption spectrometer. The concentrations of the trace elements investigated are as follows: - Ca (76.81), Mg (54.30), Fe (28.2), Cu (4.90), Zn (71.16) and Mn (14.33) mg/Kg. There had been controversial reports about the toxic elements normally present in the rice produced in different areas and conditions. The other four toxic elements As, Co, Pb and Al were also analyzed but not detected. With reference to the literature on the maximum daily intakes for human consumption, the concentration levels were all below the literature except for zinc and manganese
Źródło:
World Scientific News; 2016, 37; 50-60
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sedimentary successions in the Middle-Upper Oxfordian reef deposits from the southern part of the Kraków-Częstochowa Upland (Southern Poland)
Autorzy:
Krajewski, M.
Olchowy, P.
Rudziński, D.
Powiązania:
https://bibliotekanauki.pl/articles/2060435.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
microbialites
non-skeletal grains
reef
carbonate ramp
Oxfordian
Polska
Opis:
The sedimentary succession of the largest example of an Upper Oxfordian reef located in the southern part of the Polish sector of the northern Tethys shelf is described. Detailed sampling of exposures enabled characterization of the full succession of facies and microfacies diversity, documenting the reef evolution. The succession studied represents the maximum development of Upper Jurassic reefs in Poland corresponding to the upper Transversarium and the Bifurcatus zones, and followed by drowning of the carbonate platform in the lower Bimmamatum Zone. The reef succession comprises three types of facies, in which eight important microfacies types were distingushed, reflecting several stages of reef development. Mid-ramp, microbial-sponge frame-reefs represent a transgressive depositional sequence, up to tens of metres thick. A microbial-Crescentiella-ooid and ooid-intraclast-bioclast facies form numerous, decimetre- to metre-scale, sequences corresponding to higher-order, transgressive/regressive sea level changes. These facies represent a mid-inner ramp setting when sedimentation was dominated by bioclasts and non-skeletal grains (mainly ooids, oncoids, aggregate grains and intraclasts). The grains were stabilized by microbialites and cemented in early diagenesis, which created grain-dominated, microbial-cement supported reefs. As a result, both the mid-ramp, microbial-sponge frame-reefs and the shallow-water, grain-dominated, microbial-cement supported reefs form extensive, strongly lithified Oxfordian reef complexes in the Kraków-Częstochowa Upland.
Źródło:
Geological Quarterly; 2018, 62, 3; 653--668
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Solution and Aging Treatment Conditions on the Formation of Ultrafine-Grained Structure of CuFe2 Alloy Processed by Rolling with Cyclic Movement of Rolls
Autorzy:
Urbańczyk-Gucwa, A.
Radwański, K.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/355872.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CuFe2 alloy
severe plastic deformation
ultrafine-grains
EBSD
Opis:
The effect of second phase particles on grain refinement in CuFe2 alloy has been investigated by using rolling with the cyclic movement of rolls (RCMR) method. Two different population of second phase particles of Fe: coherent, about 10 nm in diameter and about 100 nm in size were obtained by applying aging treatment followed at 500°C for 2 h and at 700°C for 24 h respectively. In addition, solution treated samples were deformed by RCMR method at the same parameters. The microstructures of the CuFe2 alloy were analyzed using light microscope (LM), electron backscattered diffraction (EBSD) microscope technique and scanning transmission electron microscope (STEM). The presence of high-density of coherent Fe particles in the matrix inhibits recovery process and in the result obtained grain/subgrain boundaries have diffused character and are weakly visible. The largest particles which are not coherent with the matrix act as an effective barrier against the boundary motion.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1235-1240
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of fine coal grains from post-mining wastes with use of autogenous suspending bed technology
Autorzy:
Kowol, Daniel
Kurama, Haldun
Powiązania:
https://bibliotekanauki.pl/articles/409862.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
classification
fine grains
post-mining wastes dump sites
suspending bed
Opis:
In addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a twochamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.
Źródło:
Management Systems in Production Engineering; 2020, 4 (28); 220-227
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depositional environments of loesses from the Sandomierz section, SE Poland, based on lithological and SEM studies
Autorzy:
Kenig, K.
Powiązania:
https://bibliotekanauki.pl/articles/2060219.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
SE Poland
Sandomierz site
loesses
lithology
quartz grains by SEM
Opis:
The litology of the Sandomierz section deposits have been examined, with SEM analysis performed on 4 quartz grain-size classes. All of the Sandomierz deposits contain predominant quartz grains with signs of aeolian transport. This refers both to morainic till and muds underlying the loess section as well to loesses them selves along with soil complexes. A much smaller, although significant contribution comprises redeposited grains with features of a high energy beach environment. Their content in creases up section. During sedimentation of the LMg (younger upper loess) deposits (later part of the Vistulian Glaciation) wind strength was in creasing. This is indicated by the upwards increasing content of coarser fractions within the interval, with simultaneously improved sorting, as well as by the increased contribution of garnets and the greater content of zircon and rutile at the top. The increasing contribution of aeolian quartz grains, the considerable content of grains redeposited from a beach environment and the decreasing amount of post-sedimentary features all suggest increased wind speed. Low variability in the shape of the 1–0.5 mm quartz grains from the LMg horizon indicates short transport and a similar nearby source of material. Alimentary areas for this horizon were composed of young Pleistocene muds and tills. A change in depositional conditions is observed at the LMs/LMg boundary (upper part of the Vistulian Glaciation). During deposition of the LMs (younger middle loess) horizon, wind strength decreased, as shown by the content of heavy minerals and the smaller mean grain-size along with the reduced content of aeolized quartz grains.
Źródło:
Geological Quarterly; 2008, 52, 2; 169-169
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Refinement of Al-5%Cu and Al-25%Cu Alloys by Means of KoBo Methods
Autorzy:
Rodak, K.
Brzezińska, A.
Sobota, J.
Powiązania:
https://bibliotekanauki.pl/articles/351350.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Cu alloys
severe plastic deformation
ultrafine-grains
microstructure
STEM
Opis:
This study was undertaken to investigate the effect of severe plastic deformation (SPD) by extrusion combined with reversible torsion (KoBo) method on microstructure and mechanical properties of Al-5Cu and Al-25Cu alloys. The extrusion combined with reversible torsion was carried out using reduction coefficient of λ = 30 and λ = 98. In this work, the microstructure was characterized by light microscopy (LM), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). Compression test and tensile test were performed for deformed alloys. The binary Al-5Cu and Al-25Cu alloys consist of the face cantered cubic (FCC) α phase in the form of dendrites and tetragonal (C16) θ-Al2Cu intermetallic phase observed in interdentritic regions. The increase of Cu content leads to increase of interdentritic regions. The microstructure of the alloys is refined after applying KoB deformation with λ = 30 and λ = 98. Ultimate Tensile Strength (UTS) of Al-5Cu alloy after KoBo deformation with λ = 30 and λ = 98 reached about 200 MPa. UTS for samples of Al-25Cu with λ = 30 and λ = 98 increased compared to Al-5Cu alloy and exceed 320 MPa and 270 MPa respectively. All samples showed increase of plasticity with increase of reduction coefficient. Independently of reduction coefficient, the compressive strain of Al-5Cu alloys is about 60%. The Al-25Cu alloy with λ = 98 showed the value of compressive strain exceed 60%, although for this same alloy but with λ = 30, the compressive strain is only 35%.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1477-1482
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Solid Solution and Aging Treatment Conditions on the Formation of Ultrafine-Grained Structure of CuCr0.6 Alloy Processed by Compression with Oscillatory Torsion
Autorzy:
Urbańczyk-Gucwa, A.
Brzezińska, A.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/947582.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CuCr0.6 alloy
severe plastic deformation
ultrafine-grains
STEM
Opis:
The samples of the CuCr0.6 alloy in the solution treated and additionally in aging states were severely plastically deformed by compression with oscillatory torsion (COT) method to produce ultrafine – grained structure. The samples were processed by using process parameters as: frequency of torsion (f = 1.6 Hz), compression speed (v = 0.04 mm/s), angle torsion (α = ±6°), height reduction (Δh = 7 mm). The total effective strain was εft = 40. The microstructure has been analyzed by scanning transmission electron microscope (STEM) Hitachi HD-2300A equipped with a cold field emission gun at an accelerating voltage of 200 kV. The quantitative microstructure investigations as disorientation angles were performed using a FEI INSPECT F scanning electron microscope (SEM) equipped with a cold field emission gun and a electron backscattering diffraction (EBSD) detector. The mechanical properties were determined using MST QTest/10 machine equipped with digital image correlation (DIC). The COT processed alloy previously aged at 500°C per 2h shows high mechanical strength, ultimate tensile strength UTS: 521 MPa and yield tensile strength YS: 488 MP attributed to the high density of coherent precipitates and ultrafine grained structure. Keywords: CuCr0.6 alloy, severe plastic deformation, ultrafine-grains, STEM
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 2061-2066
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quartz grain features in modern glacial and proglacial environments: A microscopicstudy from the Russell Glacier, southwest Greenland
Autorzy:
Kalińska-Nartiša, Edyta
Lamsters, Kristaps
Karušs, Jānis
Krievāns, Māris
Rečs, Agnis
Meija, Raimonds
Powiązania:
https://bibliotekanauki.pl/articles/2042159.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Greenland
modern glacial environment
Quartz grains
Scanning electron microscopy
Źródło:
Polish Polar Research; 2017, 38, 3; 265-289
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Levels of intelligent grinding system
Poziomy inteligentnego system rozdrabniania
Autorzy:
Flizikowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2071576.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
integracja rozdrabniania
efektywność rozdrabniania ziaren
comminution integration
grains' grinding efficiency
Opis:
The paper describes assumptions, model and procedure of intelligent grinding by means of quasi-cutting of special biomatcrials, plastics and fibre grains/granules according to the theory of integrated optimization of grinding engineering. Mathematical foundations of analysis and a special system of optimal grinding solution are also presented.
W pracy przedstawiono założenia, model i procedurę inteligentnego rozdrabniania przez ąuasi-ścinanie ziaren biologicznych, granulatów tworzyw polimerowych i aglomeratów włóknistych według teorii zintegrowanej optymalizacji przestrzeni inżynierii rozdrabniania. Przedstawiono matematyczne uwarunkowania badawcze i specjalny system techniczny do realizacji zadań optymalnych.
Źródło:
Inżynieria i Aparatura Chemiczna; 2011, 3; 24-26
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alkilorezorcynole ziarna zbóż — ich znaczenie w żywności i paszy
Alkylresorcinols of cereal grains — their importance in food and feed
Autorzy:
Boros, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/2198767.pdf
Data publikacji:
2015-09-30
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
alkilorezorcynole
ziarno zbóż
właściwości bioaktywne
alkylresorcinols
cereal grains
bioactive properties
Opis:
Alkilorezorcynole (AR), stanowią grupę lipidów fenolowych, których znaczne ilości znajdują się w całym ziarnie zbóż. Największą zawartością tych związków charakteryzuje się ziarno żyta (360–2180 mg/kg), mniejsze ilości są znajdowane w ziarnie pszenżyta (294–1145 mg/kg) i pszenicy (268-943 mg/kg), a znacznie mniejsze w ziarnie jęczmienia (32–152 mg/kg). Na ogół nie stwierdza się ich obecności w ziarnie owsa. W latach sześćdziesiątych i siedemdziesiątych ubiegłego stulecia z uwagi na stwierdzoną wysoką zawartość AR w życie oraz niską wartość paszową tego zboża przypisano AR rolę składnika antyżywieniowego. Intensywne prace wielu zespołów wykazały w późniejszych latach, że czynnikiem odpowiedzialnym za niską strawność i przyswajalność wszystkich składników pokarmowych w przewodzie pokarmowym zwierząt monogastrycznych, w szczególności związków energetycznych w dietach opartych na ziarnie żyta jest wysoka zawartość frakcji arabinoksylanów rozpuszczalnych w wodzie, odznaczająca się dużą wodochłonnością i wysoką lepkością w środowisku wodnym. W dzisiejszych czasach AR budzą ponownie duże zainteresowanie jako ważny składnik bioaktywny żywności i potencjalny biomarker spożycia produktów całoziarnowych. Z uwagi na różnice w składzie homologicznym AR pomiędzy pszenicą a żytem, rozważana jest możliwość użycia ich do identyfikacji rodzaju spożytego ziarna. Jako grupa związków fenolowych AR wykazują silne właściwości antyoksydacyjne, ale także antybakteryjne i antymutagenne.
Alkylresorcinols (AR) are a group of phenolics lipids, found in substantial amounts in whole grain of cereals. Rye grain is characterised with the greatest content of these compounds (360–2180 mg/kg), while lower content has been found in triticale (294–1145 mg/kg) and wheat (268–943 mg/kg), and much lower in barley (32–152 mg/kg). In general, alkylresorcinols are not present in oat. In years of the sixties and seventies of the previous century, AR have been assigned a role of antinutrients in animal feeding, which was related to their high content and poor feeding quality of rye grain. The studies of many scientific groups, conducted later on, have shown that low digestibility and availability of all nutrients and in particular the energetic compounds in the intestinal tract of monogastric animals, in diets based on rye grain is a result of very high content of water-soluble fraction of arabinoxylans, that are characterized by a great water holding capacity and high viscosity in the aquatic environment. Nowadays, AR have been arousing again a great interest, as an important bioactive component of food and potential biomarker for consumption of wholegrain products. Due to the differences in the homologue composition between wheat and rye, AR are considered to be used to identify the type of grain consumed. As a group of phenolic compounds the AR are a strong antioxidant, but they have also antibacterial and antimutagenic properties.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2015, 277; 7-20
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nano-Investigations on Surface Topology and Structural Suitability of Gramicidine Drug
Autorzy:
Elsabawy, Khaled M.
Powiązania:
https://bibliotekanauki.pl/articles/1192704.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
3D-AFM
Cream
Grains Size
Gramicidin
Nano-Structural Features
Surface
Opis:
The present studies discuss the 3D-AFM nano-structural features of gramicidine – A trying to link between its nano-structural properties and its applications. The branching of polypeptide linkage of gramicidine needs special stereo – orientation to be applied as therapeutic antibacterial cream or ointment. The present 3D-AFM- investigations introduce important conclusive remarks enhance scientific community to understand why gramicidin family as antibiotic cream or ointment are structurally suitable with special surface topography enhance it to be applied as cream or ointment. Poly-peptide linkage chains have high flexibility factor with maximum degree of freedom to be bend or rotates.
Źródło:
World Scientific News; 2016, 30; 57-67
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Features and Mechanical Properties after Applying Rolling with Cyclic Movement of Rolls of an Al-Li Alloys
Autorzy:
Brzezińska, A.
Urbańczyk-Gucwa, A.
Molak, R.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/352162.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Li alloy
severe plastic deformation
ultrafine-grains
STEM
SEM/EBSD
Opis:
Two strength-age hardening aluminum-lithium alloys: Al-2.3wt%Li and Al-2.2wt%Li-0.1wt%Zr in two different heat treatment conditions: solution state (S) and additionally in aging state (A) were severely plastically deformed by rolling with cyclic movement of rolls (RCMR) method to produce ultrafine - grained structure. Two thermo-mechanical treatments were used: (S+A+RCMR) and (S+RCMR+A+RCMR). To investigate the combined effect of plastic deformation and heat treatment, tensile tests were performed. Microstructural observations were undertaken using scanning transmission electron microscopy (STEM), and scanning transmission electron microscopy (SEM) equipped with electron backscattering diffraction detector (EBSD). Based on the obtained results, it can be deduced that maximum mechanical properties as: yield strength (YS) and ultimate tensile strength (UTS) couldbe achieved when the microstructure of alloys is in (S+A+RCMR) state. For samples in (S+RCMR+A+RCMR) state, ductility is higher than for (S+A+RCMR) state. The microstructural results shows that the favourable conditions for decreasing grain size of alloys is (S+A+RCMR) state. Additionally, in this state is much greater dislocation density than for (S+RCMR+A+RCMR) state. The microstructure of alloys in (S+RCMR+A+RCMR) state is characterized by grains/subgrains with higher average diameter and with higher misorientation angles compared with (S+A+RCMR) state.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1533-1540
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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