Temat: density index - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Springs in the High Bieszczady Mountains
Źródła w Bieszczadach Wysokich
Autorzy:: Wójcik, Sabina
Lasek, Judyta
Siwek, Janusz
Mocior, Ewelina
Peek, Barbara
Plenzler, Joanna
Rzonca, Bartłomiej
Płaczkowska, Eliza
Jaśkowiec, Barbara
Dąbek, Natalia
Opis:: Characteristic of springs occurrence in the High Bieszczady Mountains (Outer Carpathians) is presented. Types of springs, its discharge and spring density index are described. Moreover distribution of springs in relation to geological structures and tectonics of the study area have been analysed. Results of research available in publications of various authors and results obtained from mapping of springs in the Polonina Wetlinska massif which was carried out in 2009-2011 are compared in the paper.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Verification of determination of hydraulic conductivity for coarse soils by empirical formulas based on the density index
Weryfikacja wyznaczania współczynnika filtracji gruntów gruboziarnistych za pomocą wzorów empirycznych z uwzględnieniem stopnia zagęszczenia
Autorzy:: Jaśkiewicz, K.
Godlewski, T.
Tematy:: filtration
hydraulic conductivity
empirical formulas
density index; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/2084034.pdf Link otwiera się w nowym oknie
Opis:: This paper examines the importance of empirical formulas for estimating the hydraulic conductivity of non- -cohesive soils, taking into account their compaction. Empirical formulas are often used in practice to quickly and cost-effectively determine hydraulic conductivity of soil. Verification of calculation of this parameter was performed for five formulas taking into account the characteristic diameters of grains and porosity. The results obtained by calculations were compared with the results of laboratory tests performed on soil samples with the same porosity coefficients (at different density index) as assumed in the calculation method. An empirical formula has been proposed to correct the hydraulic conductivity of soils obtained from the Hazen formula by taking into account the density index of a given soil.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An analytical model to predict water retention curves for granular materials using the grain-size distribution curve
Autorzy:: Bouacida, Linda
Feia, Sadok
Denine, Sid Ali
Della, Noureddine
Tematy:: sand
mean grain size
mean pore size
density index
model
pore size distribution
water retention curve; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2172891.pdf Link otwiera się w nowym oknie
Opis:: The present work aims to propose a new analytical model intended to predict the water retention curves for granular materials based on data from tensiometric tests. Different analytical models have been used for the evaluation of soil water retention curves so far. It should be noted that the proposed model considers only one criterion in the selection of soils. This criterion is the physical property of particle distribution curve that can be used to determine the values of D50 and CU. In this study, the pore-access size distribution is investigated considering the effect of the coefficient of uniformity of sandy soils that were prepared with different density indexes (0.5, 0.7, and 0.9). Moreover, the proposed model equation is based on the physical properties of soil. This equation made it possible to describe the water retention curve and to estimate the pore-access size distribution without performing any experimental tests. The findings allowed asserting that the uniformity of the particle size curves corresponds to a good uniformity of the pore-access size distribution. In addition, it was revealed that the suction increased as the density index went up, which matches well with the experimental data. Moreover, it may clearly be noted that the distinctive retention properties of unsaturated soils can be observed on the above-mentioned curves. Further, it was found that the ratio of the grain size over the pore-access size increased as the uniformity coefficient augmented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: On the applicability of in situ soil probings to geological analyses
Autorzy:: Radaszewski, Robert
Wierzbicki, Jędrzej
Tematy:: dynamic penetration test
static penetration test
soil density index
overconsolidation ratio
sondowanie dynamiczne
sondowanie statyczne
wskaźnik gęstości gleby
współczynnik prekonsolidacji; Pokaż więcej
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/94438.pdf Link otwiera się w nowym oknie
Opis:: Examples of geoengineering methods (static and dynamic probings) that can be applied to analyses of geological environments are presented. The potential is shown by the results of the determination of the values of the soil-density index (ID), the soil-behaviour index (Ic), the constrained modulus (M), the overconsolidation ratio (OCR) and their vertical changes. The values obtained for ID and Ic facilitate the determination of layers with a specific character. This is demonstrated for several aeolian and glacial deposits in Poland. The application of static probings to the analyses of changes in OCR and M made it possible to identify several depositional phases and the effect of postdepositional processes. Usages of the probings can significantly contribute to the interpretation of palaeo-environments (e.g. in the context of geostatistical models), but the results obtained should be handled cautiously.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Geologiczne uwarunkowania rozwoju osuwisk w rejonie Krynicy-Zdroju
Geological conditions of the development of landslides in the Krynica-Zdrój region
Autorzy:: Rycio, E.
Tematy:: osuwiska
nachylenie warstwy
nachylenie powierzchni terenu
trzęsienie ziemi
wskaźnik powierzchni osuwisk
wskaźnik gęstości osuwiska
landslides
layer slope
ground-surface slope
earthquakes
landslide surface index
landslide density index; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2075823.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the final results of mapping work of the Polish Geological Institute - National Research Institute, carried out in the Krynica-Zdrój area in 2010-2012. In the Beskid Niski and Sądecki there are numerous landslides of surface sediments. They also occur in the spa zone of Krynica-Zdrój, posing a threat to its functioning. The basic problem is to recognise the nature of these geohazards and their occurrence in this region. For these reasons, a landslide inventory map was constructed for the whole study area (urban-rural commune). As a result of the analysis, a large variation in the distribution, type and range of landslides has been documented. The landslide surface index and the landslide density index were calculated, concluding that the two indexes differ from each other depending on the geographical position of the analysed area. Both indicators are 2.5-3 times higher for the Krynica-Zdrój town area than for the rural commune area. This variability is associated with different lithologies, tectonics, and geomorphologic features in the area. Krynica-Zdrój lies in the area predisposed to the development of landslides, where the overlapping effects of several passive factors causes mass movements. The Krynica-Zdrój area is composed of thick-bedded sandstones of the Krynica Sandstone Member and the Piwniczna Sandstone Member. They are underlain by variegated shales and thin-bedded turbidites of the Zarzecze Formation. In addition, tectonics of the deep basement is very important. Under the town, there is a deep Krynica fault zone additionally cut by sets of strike-slip faults that altogether cause severe disintegration of the subsurface material and the weakening of cohesive force. The area with the dense sets of faults is an active stress zone. Epicentres of earthquakes probably clustered along all these faults, causing the development and rejuvenation of many landslides in the Krynica-Zdrój area.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Correlation Between K-value, Density Index and Bifilm Index in Determination of Liquid Al Cleanliness
Autorzy:: Tigli, Ahmed
Tokatli, M.
Uslu, Emin
Colak, M.
Dispinar, Derya
Tematy:: A206 alloy
K-mold method
density index
alloy quality
RPT
Reduced Pressure Test
secondary aluminum
stop A206
indeks gęstości
jakość stopu
aluminium wtórne; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111537.pdf Link otwiera się w nowym oknie
Opis:: Aluminum alloys are widely used in the industry thanks to its many advantages such as light weight and high strength. The use of this material in the market is increasing day by day with the developing technology. Due to the high energy inputs in the primary production, the use of secondary ingots by recycling from scrap material are more advantageous. However, the liquid metal quality is quite important in the use of secondary aluminum. It is believed that the quality of recycled aluminum is low, for this purpose, many liquid metal cleaning methods and test methods are used in the industry to assess the melt cleanliness level. In this study, it is aimed to examine the liquid metal quality in castings with varying temperature using K mold. A206 alloy was used, and the test parameters were selected as: (i) at 725 °C, 750 °C and 775 °C casting temperatures, (ii) different hydrogen levels. The hydrogen level was adjusted as low, medium and high with degassing, as_cast, and upgassing of the melt, respectively. The liquid metal quality of the cast samples was examined by the K mold technique. When the results were examined, it was determined that metal K values and the number of inclusions were high at the as-cast and up-gas liquid with increasing casting temperatures. It has been understood that the K mold technique is a practical method for the determination of liquid metal quality, if there is no reduced pressure test machine available at the foundry floor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Zmienność stopnia zagęszczania w profilach aluwiów na przykładzie doliny Sierpienicy
Variability of density index in alluvial profiles of Sierpienica Valley
Autorzy:: Sokołowska, M.
Tematy:: aluwia
grunt niespoisty
właściwości fizyczne
zagęszczanie
stopień zagęszczenia
Dolina Sierpienicy
badanie laboratoryjne
sondowanie dynamiczne
wyniki badań
DPL
alluvia
noncohesive soil
Sierpienica Valley
density index
laboratory test
borehole
test results; Pokaż więcej
Wydawca:: Instytut Techniki Budowlanej
Powiązania:: https://bibliotekanauki.pl/articles/183090.pdf Link otwiera się w nowym oknie
Opis:: Przedstawiono analizę zmienności stopnia zagęszczenia w profilach aluwiów na przykładzie doliny Sierpienicy. Wykorzystano do tego zbiór danych uzyskanych w trakcie opracowywania warunków geologiczno-inżynierskich doliny Sierpienicy na potrzeby planowania przestrzennego. Analizie poddano wyniki badań sondą dynamiczną lekką (DPL) oraz dane z wierceń i badań laboratoryjnych.
The article contains the analysis of variability of density index in alluvial profiles of Sierpienica Valley (Poland). For this purpose the set of data obtained during geological and engineering characteristics of Sierpienica Valley for spatial management has been used. The analysis comprises the set of results obtained by means of DPL (light dynamic probe) as well as data from boreholes and laboratory tests.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Ellipsometric spectroscopy studies of compaction and decompaction of Si-SiO2 systems
Autorzy:: Rzodkiewicz, W.
Panas, A.
Tematy:: Si-SiO2 system
density
refractive index
spectroscopic ellipsometry; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308667.pdf Link otwiera się w nowym oknie
Opis:: The influence of the strain on the optical properties of Si-SiO2 system has been investigated by spectroscopic ellipsometry (SE), interferometry and weighing methods. Subtle changes of densification (compaction degree) in silicon dioxide layers on silicon substrates have been determined by weight technique (relying on measurements of the silicon dioxide layer mass and calculations of the volume). Elastic stress in the oxide layers has been measured by Fizeau fringes image analysis method. A comparison is made between the density of the silicon dioxide (r) and the results of calculations made using r = f = (n) relations (where n is the refractive index) given in the literature.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Lung density analysis using quantitative computed tomography in children with pectus excavatum
Autorzy:: Sarioglu, Orkun
Sarioglu, Fatma C.
Gezer, Naciye S.
Odaman, Huseyin
Ulusoy, Oktay
Ates, Oguz
Guleryuz, Handan
Opis:: Purpose: To evaluate the mean lung density in children with pectus excavatum (PE) and to assess the correlation between the cardiac rotation angle, Haller index, pulmonary function test, and lung density. Material and methods: This retrospective study included 33 children with PE and 31 healthy controls. The densities of lung parenchyma were evaluated by quantitative computed tomography (CT). Three lung levels were determined: T4 vertebra level, T10 vertebra level, and the level of the measurement of the cardiac rotation angle. The cardiac rotation angle and the Haller index were calculated. All measurements were done by 2 radiologists, independently. Student's t-test or the Mann-Whitney U test, intraclass correlation coefficients, Pearson or Spearman's rank correlation coefficient, and Kruskal-Wallis test were used for statistical analysis. A p-value less than 0.05 was considered as statistically significant. Results: All the lung levels in the PE group had lower mean densities than healthy children, with statistical significance in the right lung at the T10 vertebra level (−818.60 ± 33.49 HU, −798.45 ± 40.24 HU; p = 0.028). There was a correlation between the cardiac rotation angle and the Haller index (r = 0.593; p < 0.001). There were no correlations between mean lung density and cardiac rotation angle, Haller index, and pulmonary function tests. Conclusions: The lower mean lung densities were found in PE, especially in the right lower lobe. The parenchymal aeration should be considered independently from the severity of PE.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Density Effect of Mangrove Vegetation on Gastropods on Pandansari Mangrove Ecotourism Forest, Kaliwlingi Village, Brebes Central Java
Autorzy:: Nurfitriani, Siska
Lili, Walim
Hamdani, Herman
Sahidin, Asep
Tematy:: Brebes
Clavatulidae
Diversity Index
Ellobiidae
Gastropods
Mangrove Density
Mangroves
Naticidae
Nerithidae
Potamididae
Thiaridae
Uniformity Index; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1062746.pdf Link otwiera się w nowym oknie
Opis:: This research was conducted on November 2018 - January 2019. The method used was the survey method by making direct observations on the stations that have been determined. The results of the research include two types of mangroves found, they are Rhizophora stylosa and Aviciena marina. The highest mangrove density was found at station 1, as many as 2302 ind / ha which dominated by R. stylosa. Gastropods found were Casidulla aurisfelis, Cerithidea sp., C. cingulate, C. alata, C. obtusa, Polinices sp., Puperita sp., Tarebia sp., Telescopium telescopium, and Turricula flammea. The Diversity Index obtained is 0.998 - 2.547, indicating moderate diversity. The uniformity index obtained is 0.10 - 0.27, indicating that there was a dominant community. While the relation between mangrove vegetation density and gastropods was 0.95, this shows that there is a very strong relation between the density of mangroves and gastropods.
Dostawca treści:: Biblioteka Nauki

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