A Preliminary Study on Grain Size Analyses of Reservoir Rocks of the Upper Assam Basin

2020 ◽  
pp. 1-28
Author(s):  
Pranab Boral ◽  
Subrata Borgohain Gogoi ◽  
Tapan Jyoti Gogoia ◽  
Arunabh Borpatra Gohainb
Keyword(s):  
Grain Size ◽  
Reservoir Rocks ◽  
Preliminary Study

scholarly journals The Grain Size Influence on the E1' Centre Observed in Quartz of Atmospheric Deposition at Two Japanese Cities: A Preliminary Study

2010 ◽  
Vol 37 (-1) ◽  
pp. 9-12 ◽  
Author(s):  
Yuya Yamamoto ◽  
Shin Toyoda ◽  
Kana Nagasima ◽  
Yasuhito Igarashi ◽  
Ryuji Tada
Keyword(s):  
Grain Size ◽  
Atmospheric Deposition ◽  
Oxygen Vacancies ◽  
Size Fraction ◽  
Mixture Ratio ◽  
Taklamakan Desert ◽  
Dust Sources ◽  
Preliminary Study

The Grain Size Influence on the E1' Centre Observed in Quartz of Atmospheric Deposition at Two Japanese Cities: A Preliminary StudyThe grain size influence on the number of oxygen vacancies in quartz was investigated by ESR in atmospheric deposition collected at two Japanese cities, Fukuoka and Akita, in 1969 and 1971. The finer grain size fraction shows the highest value of concentration of oxygen vacancies, most closely resembling dust originating in the Taklamakan desert. Month to month and year to year variation of the dependence was also observed which could possibly be attributed to the variation of the mixture ratio of at least two dust sources in China, A conclusive statement can not be made at this stage.

Simple petrographic grain size analysis of siltstone reservoir rocks: An example from the Montney tight gas reservoir (Western Canada)

Fuel ◽  
2016 ◽  
Vol 166 ◽  
pp. 253-257 ◽  
Author(s):  
Hamed Sanei ◽  
Omid H. Ardakani ◽  
Amin Ghanizadeh ◽  
Christopher R. Clarkson ◽  
James M. Wood
Keyword(s):  
Grain Size ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Western Canada ◽  
Tight Gas ◽  
Gas Reservoir ◽  
Reservoir Rocks ◽  
Tight Gas Reservoir

scholarly journals Influence of the Microstructure of the Initial Material on the Zn Wires Prepared by Direct Extrusion with a Huge Extrusion Ratio

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 787
Author(s):  
Jaroslav Čapek ◽  
Lukáš Kadeřávek ◽  
Jan Pinc ◽  
Jaromír Kopeček ◽  
Ladislav Klimša
Keyword(s):  
Grain Size ◽  
Mechanical Characteristics ◽  
Extrusion Ratio ◽  
Extrusion Temperature ◽  
Coarse Grained ◽  
Initial Material ◽  
Direct Extrusion ◽  
Final Microstructure ◽  
Preliminary Study ◽  
Bimodal Grain Size

In this study, we prepared zinc wires with a diameter of 250 µm by direct extrusion using an extrusion ratio of 576. We studied the influence of the extrusion temperature and microstructure of the initial Zn billets on the microstructural and mechanical characteristics of the extruded wires. The extrusion temperature played a significant role in the final grain size. The wires extruded at 300 °C possessed a coarse-grained microstructure and the shape of their tensile stress–strain curves suggested that twinning played an important role during their deformation. A significant influence of the initial grain size on the final microstructure was observed after the extrusion at 100 °C. The wires prepared from the billet with a very coarse-grained microstructure possessed a bimodal grain size. A significant coarsening of their microstructure was observed after the tensile test. The wires prepared from the medium-grained billets at 100 °C were relatively coarse-grained, but their grain size was stable during the straining, resulting in the highest ultimate tensile strength. This preliminary study shows that strong attention should be paid to the extrusion parameters and the microstructure of the initial billets, because they significantly influence the microstructure and mechanical behavior of the obtained wires.

Modern sands derived from the Vertiskos Unit of the Serbomacedonian Massif (N. Greece): a preliminary study on the weathering of the Unit

2012 ◽  
Vol 4 (3) ◽  
Author(s):  
Ioannis Georgiadis ◽  
Antonios Koroneos ◽  
Ananias Tsirambides ◽  
Michael Stamatakis
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Mineralogical Composition ◽  
Coarse Grained ◽  
Northern Greece ◽  
Physical Weathering ◽  
Metamorphic Basement ◽  
Preliminary Study ◽  
Active Channels ◽  
Mineral Constituents

AbstractModern sand samples were collected from the Vertiskos Unit of the Serbomacedonian Massif, northern Greece, and were examined for their texture and mineralogical composition. They were collected from active channels and torrents. The textural study demonstrated that these modern sands are moderately to very-poorly sorted, often polymodal in grain size distribution, texturally and mineralogically immature to submature, and consist of coarse-grained gravelly sands to slightly-gravelly muddy sands. The dominant composition is quartzofeldspathic. All samples contain detrital minerals of metamorphic origin, mainly amphibole and garnet, in addition to minor amounts of pyroxene and detrital calcite. These sediments were deposited rapidly and close to their source, the metamorphic basement of the Vertiskos Unit. The mineral constituents of the samples indicate that the Vertiskos Unit is undergoing rapid physical weathering due to the temperate and seasonal climate. The results of this study suggest that these modern sands constitute one sedimentary petrologic province comprised of primarily of amphibole-garnet.

Aluminium Surface Grain Size Analysis on RIE Treatment

2013 ◽  
Vol 404 ◽  
pp. 67-71 ◽  
Author(s):  
Zaliman Sauli ◽  
Vithyacharan Retnasamy ◽  
Fairul Afzal Ahmad Fuad ◽  
Phaklen Ehkan ◽  
Moganraj Palianysamy ◽  
...  
Keyword(s):  
Grain Size ◽  
Aluminum Film ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Important Process ◽  
Microelectronic Fabrication ◽  
Mean Grain Size ◽  
Before And After ◽  
The Mean ◽  
Preliminary Study

Reactive Ion Etch (RIE) has been an important process in the world of microelectronic fabrication. Focus of this preliminary study is on how RIE affects the grain size of aluminum film which is fabricated on substrates. RIE parameters are varied to obtain 16 different recipes which are done using Design of Experiment. Grain size of the samples is recorded for all 16 samples before and after RIE treatment. This produces results that can be compared to obtain the effect of RIE on the aluminum film. Results show that RIE affects the mean grain size of the aluminum film as it increases after RIE treatment.

Computed Tomography Analysis of Representative Elementary Volume (REV) of Porous Medium

2013 ◽  
Vol 868 ◽  
pp. 234-237 ◽  
Author(s):  
Da Yong Wang ◽  
Hu Shan Xu ◽  
Xiao Jing Ma
Keyword(s):  
Computed Tomography ◽  
Grain Size ◽  
Porous Medium ◽  
Numerical Modeling ◽  
Representative Elementary Volume ◽  
Elementary Volume ◽  
Reservoir Rocks ◽  
Grain Sizes ◽  
Ct Measurement ◽  
Tomography Analysis

Representative Elementary Volume (REV) is not only a necessary measure for studying heterogeneous pore structure of reservoir rocks but also an important parameter for core-scale numerical modeling. In this paper, we accordingly analyze the REV for different porous media with different grain sizes based on computed tomography (CT) measurement. Our results show that that CT measurement is a relible method for REV analysis and that there is an appropriate linear relationship between grain size and REV.

Estudo dos Sedimentos de Fundo do Alto Rio Grande: Município de Nova Friburgo

1979 ◽  
Vol 3 ◽  
pp. 82-92
Author(s):  
Sandra Baptista da Cunha
Keyword(s):  
Grain Size ◽  
Rio Grande ◽  
Central Tendency ◽  
Bed Sediments ◽  
Base Level ◽  
River Bed ◽  
Granulometric Analysis ◽  
Mean Grain Size ◽  
Preliminary Study ◽  
The Relationship

The present paper is a contribution to the study of the Upper Grande River, Nova Friburgo. It is a preliminary study of the relationship between the river-bed sediments and the declivity of the river profile. Granulometric analysis were performed on channel sediments in attempt to find a sedimentological caracterization of the river. The following parameters were computed: central tendency (median grain size (Md;) and mean grain size (M Z) , dispersion (σI) , assimetry (SK I) and curtosis (K G).The data analysed shows two distinct environments: that of the headwaters and that of the base level. Both environments are composed of poorly selected sediments.

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

The Ultrastructure of Metastatic Human Mammary Carcinoma After Prolonged Estrogen Therapy

1967 ◽  
Vol 25 ◽  
pp. 180-181
Author(s):  
John H.L. Watson ◽  
John L. Swedo ◽  
R.W. Talley
Keyword(s):  
Mammary Carcinoma ◽  
Osmium Tetroxide ◽  
Estrogen Therapy ◽  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Human Mammary Carcinoma ◽  
Surgical Biopsy ◽  
Lead Hydroxide ◽  
Preliminary Study ◽  
Hormonal Therapies

A preliminary study of human mammary carcinoma on the ultrastructural level is reported for a metastatic, subcutaneous nodule, obtained as a surgical biopsy. The patient's tumor had responded favorably to a series of hormonal therapies, including androgens, estrogens, progestins, and corticoids for recurring nodules over eight years. The pertinent nodule was removed from the region of the gluteal maximus, two weeks following stilbestrol therapy. It was about 1.5 cms in diameter, and was located within the dermis. Pieces from it were fixed immediately in cold fixatives: phosphate buffered osmium tetroxide, glutaraldehyde, and paraformaldehyde. Embedment in each case was in Vestopal W. Contrasting was done with combinations of uranyl acetate and lead hydroxide.

Aspects of microanalysis in a transmission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 510-511
Author(s):  
R. Sinclair ◽  
B.E. Jacobson
Keyword(s):  
Grain Size ◽  
Electron Beam ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Transmission Electron Microscope ◽  
Vapor Deposition ◽  
Critical Currents ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron

INTRODUCTIONThe prospect of performing chemical analysis of thin specimens at any desired level of resolution is particularly appealing to the materials scientist. Commercial TEM-based systems are now available which virtually provide this capability. The purpose of this contribution is to illustrate its application to problems which would have been intractable until recently, pointing out some current limitations.X-RAY ANALYSISIn an attempt to fabricate superconducting materials with high critical currents and temperature, thin Nb3Sn films have been prepared by electron beam vapor deposition [1]. Fine-grain size material is desirable which may be achieved by codeposition with small amounts of Al2O3 . Figure 1 shows the STEM microstructure, with large (∽ 200 Å dia) voids present at the grain boundaries. Higher quality TEM micrographs (e.g. fig. 2) reveal the presence of small voids within the grains which are absent in pure Nb3Sn prepared under identical conditions. The X-ray spectrum from large (∽ lμ dia) or small (∽100 Ǻ dia) areas within the grains indicates only small amounts of A1 (fig.3).

Sign in / Sign up

Export Citation Format

Share Document