Temat: grains - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Chemical, Physical, and Sensory Properties of Bread with Popped Amaranth Flour
Autorzy:: Chaquilla-Quilca, Guadalupe
Islas-Rubio, Alma Rosa
Vásquez-Lara, Francisco
Salcedo-Sucasaca, Lourdes
Silva-Paz, Reynaldo Justino
Luna-Valdez, Jesús Guadalupe
Powiązania:: https://bibliotekanauki.pl/articles/31341112.pdf
Data publikacji:: 2024-05-14
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: Amaranthus caudatus
popped grains
pasting properties
bread physical properties
Flash profile
Opis:: This study investigated the effect of substitution of wheat flour with popped amaranth flour in bread formulation on the chemical, physical, and sensory characteristics of breads. The raw and popped amaranth grain flours of four Peruvian varieties: Oscar Blanco, Centenario, Taray, and Imperial, were characterised for chemical composition and pasting properties using Rapid Visco-Analyzer (RVA). Both types of amaranth flour had a high nutritional value, but the peak and final viscosity of popped amaranth flour were closer to the wheat flour. Breads were formulated with the popped amaranth flour, at four substitution levels of 0, 10, 20, and 30%. A significant increase in contents of protein (around 12%) and raw fiber (more than 100%), and a decrease in carbohydrate content (around 6%) in breads at the highest substitution level compared to wheat bread were observed. At this substitution level, the RVA profile parameters, specific volume, pore area, and colour coordinates (L*, a*, and b*) differed significantly. In the sensory analysis using Flash profile technique, consumers identified that the Taray and Imperial bread varieties at 10 and 20% substitution level were similar to the wheat bread. Adding popped amaranth flour to bread improved the nutritional value, ensuring good physical and sensory properties. Popped amaranth flour can, thus, be an alternative to wheat flour in the development of healthy bakery products.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 137-146
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Identification of the Parameters of the Model Generating the Microstructure in the Integrated Heating-Remelting-Cooling Process
Autorzy:: Marynowski, Przemysław
Hojny, Marcin
Dębiński, Tomasz
Cedzidło, D.
Powiązania:: https://bibliotekanauki.pl/articles/27314150.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: heating-remelting-cooling process
Gleeble 3800
Monte Carlo method
grains
ogrzewanie
przetapianie
chłodzenie
Metoda Monte Carlo
ziarna
Opis:: This paper identifies and describes the parameters of a numerical model generating the microstructure in the integrated heating-remelting-cooling process of steel specimens. The numerical model allows the heating-remelting-cooling process to be simulated comprehensively. The model is based on the Monte Carlo (MC) method and the finite element method (FEM), and works within the entire volume of the steel sample, contrary to previous studies, in which calculations were carried out for selected, relatively small areas. Experimental studies constituting the basis for the identification and description of model parameters such as: probability function, initial number of orientations, number of cells and number of MC steps were carried out using the Gleeble 3800 thermo-mechanical simulator. The use of GPU capabilities improved the performance of the numerical model and significantly reduced the simulation time. Thanks to the significant acceleration of simulation times, it became possible to comprehensively implement a numerical model of the heating-transformation-cooling process in the entire volume of the test sample. The paper is supplemented by results of performance tests of the numerical model and results of simulation tests.
Źródło:: Archives of Foundry Engineering; 2023, 23, 2; 72--79
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Integration of Ukrainian Grain Markets with Foreign Markets During Russias Invasion of Ukraine
Integracja ukraińskich rynków zbóż z rynkami zagranicznymi w czasie inwazji Rosji na Ukrainę
Autorzy:: Hamulczuk, Mariusz
Cherevyk, Denys
Makarchuk, Oksana
Kuts, Tetyana
Voliak, Lesia
Powiązania:: https://bibliotekanauki.pl/articles/43194727.pdf
Data publikacji:: 2023-12-22
Wydawca:: Instytut Ekonomiki Rolnictwa i Gospodarki Żywnościowej - Państwowy Instytut Badawczy
Tematy:: integracja przestrzenna rynków
zboża
wojna rosyjsko-ukraińska
spatial market integration
grains
Russian-Ukrainian war
Opis:: Celem artykułu jest ocena wpływu konfliktu rosyjsko-ukraińskiego na siłę i charakter integracji ukraińskich rynków zbożowych z rynkami światowymi. Badania empiryczne odwołują się do teoretycznych podstaw przestrzennej integracji rynków i modelu równowagi przestrzennej. Zgodnie z nimi zmiany w integracji ukraińskich i światowych rynków pszenicy, kukurydzy i jęczmienia są oceniane za pomocą przepływów towarowych, kosztów wymiany handlowej i badania współzmienności cen. W celu oceny implikacji handlowych miesięczne przepływy towarowe, udziały w handlu i miary koncentracji handlu podczas konfliktu porównano z wartościami oczekiwanymi zakładającymi brak wojny. Aby ocenić wpływ konfliktu na koszty wymiany handlowej, przeanalizowano różnice między cenami zbóż w Ukrainie i na świecie. Opierając się na tygodniowych szeregach czasowych, współzmienność cen została oceniona za pomocą modelu ARDL i testu natychmiastowej przyczynowości Grangera. Wyniki pokazują, że siła integracji ukraińskich rynków zbożowych z rynkami światowymi osłabła w wyniku konfliktu. Potwierdza to spadek wolumenu eksportu zbóż z Ukrainy, wzrost różnic cenowych oraz brak istotnej transmisji cen między ukraińskimi i światowymi rynkami zbóż od momentu wybuchu wojny. Dodatkowo zmienił się charakter integracji rynków. Obserwujemy rosnącą rolę krajów Unii Europejskiej (UE) w udziale eksportu zbóż z Ukrainy oraz zmiany w koncentracji eksportu. Takie zachowanie jest zgodne z teoretycznymi podstawami modelu równowagi przestrzennej oraz teorią integracji międzynarodowej.
The paper aims to evaluate the implications of the Russian-Ukrainian conflict for the strength and nature of the integration of Ukrainian grain markets with world markets. The empirical research is based on the theoretical foundations of spatial market integration and the spatial market equilibrium model. According to them, changes in the integration of Ukrainian and world wheat, corn, and barley markets are evaluated via fluctuations in trade flow volumes, changes in trade costs and price co-movement. To analyze trade implications, monthly trade flow volumes, trade shares, and trade concentration measures during the conflict were compared with expected values assuming no war. To evaluate the implications of the conflict for trade costs, the authors analyzed differences between Ukrainian and world grain prices. Relying on the weekly price series, the price co-movement was assessed using the autoregressive distributed lag model (ARDL) and Granger instantaneous causality test. The results show that the strength of the integration of Ukrainian grain markets with world markets has deteriorated due to the conflict. It is confirmed by the decrease in the grain export volumes from Ukraine, the increase in price differences, and the lack of significant price transmission between Ukrainian and global grain markets since the war outbreak in February 2022. Moreover, the nature of the market integration has changed. One can observe a growing role of the European Union countries in the Ukrainian grain export share and changes in the Ukrainian grain export concentration. Such behaviour is in line with the theoretical foundation of the spatial market equilibrium model and theory of international integration.
Źródło:: Zagadnienia Ekonomiki Rolnej; 2023, 377, 4; 1-25
0044-1600
2392-3458
Pojawia się w:: Zagadnienia Ekonomiki Rolnej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Provenance of quartz debris in the Central Western Carpathians at the end of the Triassic, as indicated by cathodoluminescence colours
Autorzy:: Vďačný, Marek
Michalík, Josef
Powiązania:: https://bibliotekanauki.pl/articles/24024716.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: aeolian quartz grains
cathodoluminescence
provenance
Fatra Formation
Zliechov Basin
Upper Triassic
Slovakia
ziarna kwarcowe
ziarna eoliczne
katodoluminescencja
pochodzenie
formacja Fatry
Kotlina Zliechowska
górny trias
Słowacja
Opis:: Lithic fragments including quartz grains occur infrequently in the shallow-marine limestone sequence of the Fatra Formation deposited in the tensional intra-shelf depression of the Central Western Carpathians during the Rhaetian. Nevertheless, their study can bring data answering questions of sources, palaeogeodynamic arrangement, and processes at the end of the Triassic. In this study, we examined optically the cathodoluminescence (CL) colours of single quartz grains from the Kardolína section (Tatra Mts, Slovakia). These colours reveal a dominance of grains derived from regionally metamorphosed and plutonic rocks. Grains of hydrothermal and pegmatite origin are less frequent. Some of the quartz grains show recycled cement rims suggesting at least a second cycle origin. This sedimentary basin was situated near to the passive margin formed by the Variscan consolidated terrains of the Vindelician Highlands. Our study of the CL colours of quartz grains contributes to the elucidation of the nature of the rocks of the vanished Vindelician mountain belt.
Źródło:: Acta Geologica Polonica; 2023, 73, 1; 103--114
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Assessment of exposure to nickel intake with selected cereal grains and cereal-based products
Autorzy:: Mania, M.
Rebeniak, M.
Orshulyak, O.
Postupolski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2087247.pdf
Data publikacji:: 2021
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:: nickel
cereals grains
cereal-based products
intake
exposure assessment
Tolerable Daily Intake
TDI
Opis:: Background. Cereal grains and their products are among the basic components of the diet all over the world. Their consumption varies depending on the dietary habits in each country. Apart from ingredients valuable from a health point of view, these products can also be a source of contaminants. The European Food Safety Authority (EFSA) included these foodstuffs in the group of main contributors to the dietary exposure to nickel by different groups of the population. Objective. The aim of the studies was to determine the nickel content in cereal grains and selected cereal products commercially available in Poland and to assess the exposure of consumers to nickel intake with these foodstuffs. Material and methods. A total of 56 samples of cereal grain and cereal products from trade were tested. Nickel content was determined after microwave mineralization of the samples by atomic absorption spectrometry with a graphite furnace atomization (GFAAS). The estimated exposure for the different groups of the population was assessed and compared with the Tolerable Daily Intake (TDI) value established by the European Food Safety Authority based on an updated risk assessment at 13 μg/kg body weight (b.w.) per day. Results. The mean (MB) and 95th percentile (MB) nickel content in investigated samples of cereal grains and their products were 0.66 mg/kg and 1.93 mg/kg. The mean content of Ni in the analyzed samples of grains was 1.16 mg/kg. Obtained results in this group of products ranged from 0.10 mg/kg for rye to 4.80 mg/kg for millet. In the group of grain products, the mean (MB) concentration of nickel was 0.61 mg/kg (95th percentile (MB) 1.84 mg/kg). The highest nickel level was determined in the samples of bran, groats, and flakes compared to other grain-based products. The highest content of Ni in the group of cereal products was found in the samples of roasted buckwheat 1.81 mg/kg and oat flakes 2.53 mg/kg. Significantly lower nickel content was observed in barley groats as well as for pasta and flour. The estimated average exposure of adults and children to nickel intake with grains and grain-based products ranged from 1.1% to 13.4% of TDI and it does not pose a health risk for consumers. Conclusions. Based on the obtained results, it was found that the nickel content in the tested samples of cereals and their products does not pose a health risk, even though the contamination of individual samples was significant
Źródło:: Roczniki Państwowego Zakładu Higieny; 2020, 71, 4; 371-376
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effective removing of light impurities from an aggregate in SEL separator
Efektywne usuwanie frakcji lekkiej z kruszywa w separatorze SEL
Autorzy:: Gawenda, Tomasz
Surowiak, Agnieszka
Stempkowska, Agata
Krawczykowska, Aldona
Saramak, Daniel
Powiązania:: https://bibliotekanauki.pl/articles/1841510.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: mineral aggregate
SEL separator
chalcedonite
regular grains
pilot plant
kruszywo mineralne
separator SEL
chalcedonit
ziarna foremne
instalacja pilotażowa
Opis:: The aim of the paper is a work characteristics of innovative technological circuit for production and beneficiation of minerals aggregates. Investigative programme included separation of chalcedonite aggregate with particle size range 2-4 mm, 2-8 mm and 8-16 mm, upstream separated into regular and irregular particles. Tests were conducted in a dedicated separation device of light fractions (SEL) constructed in in HTS Gliwice, within the frames of “Formator Puls” project.
Celem artykułu jest charakterystyka pracy innowacyjnego układu technologicznego służącego do produkcji i uszlachetniania kruszyw mineralnych. W ramach badań przetestowano proces uszlachetniania kruszywa chalcedonitowego o uziarnieniu 2-4 mm, 2-8 mm i 8-16 mm rozdzielonego na frakcje z ziarnami foremnymi i nieforemnymi w specjalnie skonstruowanym i zabudowanym w laboratorium separatorze frakcji lekkiej – SEL zbudowanym przez HTS Gliwice w ramach projektu Formator Plus.
Źródło:: Inżynieria Mineralna; 2021, 1; 53-60
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

Tytuł:: Impact of chemical and physical properties on flowability characteristics of corn distillers dried grains with solubles
Autorzy:: Pekel, A.Y.
Calik, A.
Kuter, E.
Alatas, M.S.
Oklen, S.B.
Kizil, A.
Bulat, M.
Cengiz, O.
Powiązania:: https://bibliotekanauki.pl/articles/2082879.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: angle of repose
bulk density
compressibility
distillers dried grains with solubles
flowability
Opis:: The influence of the physical and chemical composition of corn distillers dried grains with solubles on its flowability was evaluated in the current study. The samples were evaluated for angle of repose, compressibility, Hausner ratio, tapped density, bulk density, mean bulk density, colour and nutrient content. PROC CORR and REG procedures were used to determine correlations. The ether extract was negatively correlated with crude protein and redness (a*), while crude protein was negatively correlated with yellowness (b*). Acid detergent fibre and neutral detergent fibre were negatively correlated with a* and positively correlated with lightness (L*), respectively. Compressibility showed a negative correlation with bulk density. Bulk density, tapped density and mean bulk density did not impact the angle of repose. The angle of repose was positively correlated with the compressibility and Hausner ratio. Apart from the correlation between acid detergent fibre and tapped density, the angle of repose and other physical parameters were not affected by the nutrient composition of the distillers dried grains with solubles samples. In conclusion, the results of this study indicate that nutrient composition has little influence over the flowability of distillers dried grains with solubles but compressibility and the Hausner ratio can be used to predict the potential flow characteristics of corn distillers dried grains with solubles.
Źródło:: International Agrophysics; 2020, 34, 2; 195-202
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Metodyka badań genezy złota okruchowego
Detrital gold origin research methodology
Autorzy:: Kania, Marcin
Powiązania:: https://bibliotekanauki.pl/articles/2030611.pdf
Data publikacji:: 2020
Wydawca:: Poltegor-Instytut Instytut Górnictwa Odkrywkowego
Tematy:: złoto okruchowe
badania genezy
metodyka
analizamorfologii ziaren
analiza EDS
detrital gold
genesis research
methodology
grains morphology analysis
EDS analysis
Opis:: Zaprezentowano sprawdzoną metodykę badań genezy złota okruchowego. Nadrzędną rolę w metodyce pełnią analizy obecnych w złocinach mikrowrostków, w szczególności niezwietrzałego okruszcowania. Analizy morfologiczne złocin oraz ich składu chemicznego pełnią rolę uzupełniającą. Zaproponowano nową, autorską metodę badań morfologii złocin na podstawie analizy ich kształtu w przekroju.
Verified methodology of the detrital gold’s genesis research has been presented. Analysis of the microinclusions occured within gold grains, especially these ones of the unweathered ore minerals, are superior part in presented methodology. Chemical analysis and assays of the grains morphology constitute the complementary parts. New, original method of the gold grains morphology research has been proposed, which is based on the analysis of the grains shape in cross-section.
Źródło:: Górnictwo Odkrywkowe; 2020, 61, 4; 25--34
0043-2075
Pojawia się w:: Górnictwo Odkrywkowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

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

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Skocz do pozycji: 11.

Tytuł:: Probabilistyczny model dyskretnego rozkładu gęstości warstw w łożu osadzarki
Probabilistic Model of Discrete Distribution of Layer Density in the Jig Bed
Autorzy:: Glowiak, Stanisław
Powiązania:: https://bibliotekanauki.pl/articles/318347.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: wzbogacanie węgla kamiennego
osadzarka
modelowanie osadzania
krzywe rozdziału
rozpraszanie ziaren
hard coal enrichment
jig
modeling of the jig operation
dispersion of grains
separation curves
Opis:: W artykule przedstawiono szczegółowy opis probabilistycznego modelu dyskretnego rozkładu gęstości warstw w łożu osadzarki opracowanego na podstawie założeń przedstawionych w pracy (Głowiak 2019). Opis ten zawiera wszystkie wzory opisujące zależności istniejące w tym modelu. Podano także te szczegóły założeń, których jasne przedstawienie korzystniej było połączyć ze szczegółami obliczeń. Wykonany model wykorzystano do obliczeń rozkładu gęstości cząstek w poszczególnych warstwach. Obliczenia te wykazują istnienie znacznych różnic w tych rozkładach w stosunku do innych znanych modeli. Także całościowy obraz procesu wzbogacania w osadzarce przyjmowany na podstawie dotychczasowych badań eksperymentalnych i rozważań teoretycznych znacznie różni się od obrazu wynikającego z przedstawianego modelu. Różnice te okazują się ważne także dla praktyki wzbogacania węgla wskazując wyraźnie na wybór kierunku modernizacji osadzarek istotnie różny od tendencji aktualnie panujących wśród konstruktorów tych maszyn. Z przedstawionego modelu wynika także niepoprawność obecnie używanych obliczeń do przewidywania wyników wzbogacania z zastosowaniem krzywych rozdziału spowodowaną głównie dowolnością wyboru gęstości rozdziału, która w rzeczywistym procesie osadzania jest znacznie ograniczona przez gęstości tworzących się warstw. Przedstawiony model pokazuje także, że matematyczna aproksymacja krzywych rozdziału przyjmowana w tych obliczeniach nie jest poprawna.
Presented paper is the detailed description of probabilistic model of discrete distribution of layer density in the jig bed, developed on the basis of its assumptions presented in the paper (Głowiak 2019). This elaboration contains all formulas describing the relationships existing in this model. The details of the assumptions were also given, which clear presentation was more advantageous to combine with the details of the calculations. The model was used to calculate the density distribution of particles in individual layers. These calculations show that there are significant differences in these distributions compared to other known models. Also the overall picture of the enrichment process in the jig adopted on the basis of previous experimental research and theoretical considerations is significantly different from the picture resulting from the presented model. Observed differences also turn out to be important for the practice of coal enrichment, indicating clearly the choice of the direction of jigs modernization significantly different from the trends currently prevailing among the designers of these machines. The presented model shows also incorrectness of currently used calculations to predict separation results using separation curves mainly due to the free choice of separation density. The choice of separation density in the actual jig operation process is significantly limited by the densities of the layers formed. The presented model shows that the mathematical approximation of the separation curves in the currently used calculation is not correct.
Źródło:: Inżynieria Mineralna; 2020, 1, 1; 187-198
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

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

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

Tytuł:: Ultrasonic cleaning of catalytic mass grains from a pressure filter
Autorzy:: Dobrzański, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/2065634.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska
Tematy:: ultrasonic cleaning
filtration
morphology of grains
catalytic mass
czyszczenie ultradźwiękowe
filtrowanie
morfologia ziaren
masy katalityczne
Opis:: The article presents pilot research on the use of ultrasound during pressure filter backwashing to improve the efficiency of removing impurities from the surface of grains. Ultrasound is widely used in various fields for removing impurities, breaking or crushing. A low-frequency ultrasonic cleaning method was used to remove accumulated iron hydroxide deposits from the catalytic mass grains; this method did not remove manganese from the water. As the preliminary research has shown, the method gives satisfactory results. An improvement in manganese removal efficiency of around 40% was obtained.
Źródło:: Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 2; 53--60
2299-8535
2544-963X
Pojawia się w:: Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

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

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