scholarly journals ON PETROPHYSICAL PARAMETERS’S RELATIONS IN FRACTAL MEDIUM

2019 ◽  
Vol 2 (2) ◽  
pp. 241-247
Author(s):  
Vladimir Filatov
Keyword(s):  
Physical Characteristics ◽  
Petrophysical Parameters ◽  
Core Samples ◽  
Fractal Medium ◽  
Lack Of Information ◽  
Fractal Characteristics ◽  
Saturated Medium

Features of influence of fractal characteristics of the environment on interrelation of petrophysical parameters in heterogeneous fluid-saturated medium on the example of the collection of core samples from the productive horizons of the Devonian and of the Carboniferous are considered. It is shown that the typical characteristics of fractal mediums, connecting physical characteristics with the impedance can be used at the prediction of petrophysical parameters at the lack of information.

scholarly journals Preliminary studies for an integrated assessment of the hydrothermal potential of the Pechelbronn Group in the northern Upper Rhine Graben

2018 ◽  
Vol 45 ◽  
pp. 251-258 ◽  
Author(s):  
Meike Hintze ◽  
Barbara Plasse ◽  
Kristian Bär ◽  
Ingo Sass
Keyword(s):  
Gamma Ray ◽  
Joint Inversion ◽  
Tectonic Setting ◽  
Rock Properties ◽  
Upper Rhine Graben ◽  
Petrophysical Parameters ◽  
Core Samples ◽  
Rhine Graben ◽  
Model Unit ◽  
Upper Rhine

Abstract. The northern Upper Rhine Graben is due to its tectonic setting and the positive geothermal anomaly a key region for geothermal heat and power production in Europe. In this area the Upper Eocene to Lower Oligocene Pechelbronn Group reaches depths of up to 2800 m with temperatures of locally more than 130 ∘C. In order to assess the hydrothermal potential of the Pechelbronn Group a large dataset is compiled and evaluated. Petrophysical parameters are measured on core samples of eight boreholes (courtesy of Exxon Mobil). Additionally, 15 gamma-ray logs, 99 lithology logs as well as more than 2500 porosity and permeability measurements on cores of some of these boreholes are available. The Lower Pechelbronn Beds are composed of fluvial to lacustrine sediments, the Middle Pechelbronn Beds were deposited in a brackish to marine environment and the Upper Pechelbronn Beds consist of fluvial/alluvial to marine deposits. In between the western and eastern masterfaults of the Upper Rhine Graben several fault blocks exist, with fault orientation being sub-parallel to the graben shoulders. During the syntectonic deposition of the Pechelbronn Group these fault blocks acted as isolated depocenters, resulting in considerable thickness and depositional facies variations on the regional and local scale (few tens to several hundreds of meters). Laboratory measurements of sonic wave velocity, density, porosity, permeability, thermal conductivity and diffusivity are conducted on the core samples that are classified into lithofacies groups. Statistically evaluated petrophysical parameters are assigned to each group. The gamma-ray logs serve to verify the lithological classification and can further be used for correlation analysis or joint inversion with the petrophysical data. Well data, seismic sections, isolines and geological profiles are used to construct a geological 3-D model. It is planned to use the petrophysical, thermal and hydraulic rock properties at a later stage to parametrize the model unit and to determine, together with the temperature and thickness of the model unit, the expected flow rates and reservoir temperatures and thus the hydrothermal potential.

scholarly journals PHYSICAL CHANGES IN ESTUARINE SEDIMENTS ACCOMPANYING CHANNEL DREDGING

1974 ◽  
Vol 1 (14) ◽  
pp. 75
Author(s):  
Charles K. Sollitt ◽  
Stephen D. Crane
Keyword(s):  
Bottom Sediments ◽  
Biological Activities ◽  
Physical Characteristics ◽  
Estuarine Sediments ◽  
Low Flow ◽  
Bottom Surface ◽  
Army Corps ◽  
Clay Material ◽  
Partial Recovery ◽  
Core Samples

The physical characteristics of estuarine sediments provide useful information about sediment sources, the nature of bottom surface stresses and sediment transport mechanisms. Changes in sediment composition and state are also useful indicators for estimating the effects of unnatural stresses on dependent chemical and biological activities. In this study, the changes in several sediment properties have been monitored for an isolated estuarine dredging project. The effect of estuarine hopper dredge activities has been evaluated for an Army Corps of Engineers project at Coos Bay, Oregon. The project included suction head dredging at a shoal area within the navigation channel and in bay spoiling at a deep section of channel one mile downstream from the dredge site. Core samples were taken five days before dredging and two, thirteen and seventy days after dredging at the dredge and spoil sites. Subsequent laboratory analysis of the core samples revealed that dredging induced redistribution of bottom sediments produced significant changes in several physical characteristics of the dredged material. Repeated resuspension of bottom sediments during the dredging and spoiling operations caused a net loss of fine grained sediments and light organic constituents. Several symptomatic changes were observed which validate this finding, including: an increase in median grain size and decrease in uniformity of dredge spoils due to loss of fine fractions; a decrease in volatile solids in the dredge spoils due to a net loss of organics; a decrease in porosity at the spoils site due to the ability of the coarse grain sediments to resist resuspension; and a decrease in hygroscopic moisture content due to loss of porous organics and silt-clay material from the spoils. Conditions following dredging were observed for a period of seventy days. Partial recovery of the sediment system was observed after two weeks with no further recovery in two months. The initial recovery came about due to the availability of local sources of resuspended sediment adjacent to the dredge site. This occured under low flow conditions in early fall. Complete recovery of the system was not observed and probably requires the relatively large sources of sediment which accompany heavy winter and spring runoff. Thus, the immediate effects of dredging may persist until the annual cycle of sediment erosion and deposition have occurred.

Physical Characteristics and Physiological Attributes of Adolescent Volleyball Players—A Review

2010 ◽  
Vol 22 (1) ◽  
pp. 114-134 ◽  
Author(s):  
Ronnie Lidor ◽  
Gal Ziv
Keyword(s):  
Vertical Jump ◽  
Physical Characteristics ◽  
Lower Body ◽  
Careful Selection ◽  
Male Adolescent ◽  
Lack Of Information ◽  
Volleyball Players ◽  
Physiological Attributes ◽  
Physiological Tests ◽  
Selection Of

The purpose of this article was to review a series of studies (n = 31) on physical characteristics, physiological attributes, and volleyball skills of female and male adolescent volleyball players. Among the main findings were (a) that male national players were taller and heavier than state and novice players, while female national players showed lower body fat values compared with state and novice players, and (b) vertical jump values were higher in starters versus nonstarters. Among the methodological concerns based on the reviewed studies were the lack of information on maturational age and lack of longitudinal studies. It was recommended that a careful selection of physiological tests should be made when assessing the abilities of adolescent volleyball players.

scholarly journals PEMETAAN KARAKTERISTIK FISIK SEDIMEN DI PANTAI BERMANGROVE DI PESISIR DESA TIMBULSLOKO, KABUPATEN DEMAKPEMETAAN KARAKTERISTIK FISIK SEDIMEN DI PANTAI BERMANGROVE DI PESISIR DESA TIMBULSLOKO, KABUPATEN DEMAK

2018 ◽  
Vol 6 (3) ◽  
pp. 283-292
Author(s):  
Rania Widia Hapsari ◽  
Boedi Hendrarto ◽  
Max Rudolf Muskananfola
Keyword(s):  
Principal Component Analysis ◽  
Relative Density ◽  
Mangrove Forest ◽  
Coastal Region ◽  
Principal Component ◽  
Component Analysis ◽  
Coastal Areas ◽  
Physical Characteristics ◽  
Jar Test ◽  
Lack Of Information

ABSTRAK Karakteristik fisik sedimen dan dinamika pergerakannya mempunyai peranan penting bagi stabilitas suatu kawasan pesisir. Desa Timbulsloko, Kabupaten Demak merupakan salah satu desa di kawasan pesisir yang memiliki pantai yang bermangrove. Sama dengan daerah pesisir lainnya, daerah ini juga mendapat pengaruh faktor lingkungan dari darat dan laut yang dikhawatirkan dapat menyebabkan perubahan garis pantai. Penelitian ini dilakukan guna menjawab permasalahan belum banyaknya informasi mengenai karakteristik fisik sedimen dalam hubungannya dengan mangrove di kawasan tersebut. Penelitian dilaksanakan pada Bulan Maret 2017 bertempat di Desa Timbulsloko, Kabupaten Demak. Penelitian bertujuan untuk mengetahui kondisi kawasan pesisir Desa Timbulsloko ditinjau dari karakteristik fisik sedimen dan kondisi kerapatan relatif hutan mangrovenya. Sampling sedimen dilakukan disepanjang pantai sejauh 775m. Beberapa metode yang dilakukan pada penelitian yaitu Metode Soil Jar Test, Haphazard, Point Centered Quarter, dan Principal Component Analysis. Hasil penelitian menunjukkan bahwa sedimen didominasi oleh fraksi lumpur (92,50%), sedimen memiliki warna coklat muda hingga kehitaman dengan nilai HUE 28,53-36,61o, salinitas sedimen berkisar antara 13,60-25‰. Jenis mangrove yang mendominasi kawasan tersebut yaitu Rhizophora sp.. Berdasarkan analisa PCA, fraksi liat dan lumpur dalam sedimen berkorelasi positif dengan kerapatan total mangrove. Kata Kunci : Karakteristik Fisik Sedimen; Kerapatan Relatif Hutan Mangrove; Desa Timbulsloko ABSTRACT The physical characteristics of sediment and the dynamics of its movement have an important role for the stability of a coastal region. Timbulsloko Village, Demak Regency is one of the villages in the coastal area overgrown by mangroves.  Similar to other coastal areas, this area also has the effect of environmental factors from land and sea that are feared can cause coastline shifts. This research was conducted to answer the problem of the lack of information about the physical characteristics of sediment in relation to the mangroves in the area. The research was conducted in March 2017 at Timbulsloko Village, Demak Regency. This study aimed to determine the condition of coastal areas of Timbulsloko Village in terms of physical characteristics of sediment and relative density of mangrove forest conditions. Sediment sampling was done along the coast as far as 775m. Some method that used in this study are Soil Jar Test, Haphazard, Point Centered Quaretr, and Principal Component Analysis. The results showed that sediment was dominated by mud fraction (92,50%), sediment had light brown to blackish with HUE value 28,53-36,61o, sediment salinity was between 13,60-25 ‰. Type of mangrove that dominates the area is Rhizophora sp.. Based on PCA analysis, clay and mud fraction in the sediment correlated positively with the total relative density of mangrove. Keyword : Physical Characteristic of Sediment; Relative Density of Mangrove Forest; Timbulsloko Village

The Imaging of Crystal Structures and Crystal Defects

1978 ◽  
Vol 36 (3) ◽  
pp. 207-217
Author(s):  
J.M. Cowley
Keyword(s):  
Electron Microscope ◽  
Crystal Structures ◽  
Phase Contrast ◽  
Crystal Defects ◽  
Atom Density ◽  
Lack Of Information ◽  
Spatial Frequencies

The problem of "understandinq" electron microscope imaqes becomes more acute as the resolution is improved. The naive interpretation of an imaqe as representinq the projection of an atom density becomes less and less appropriate. We are increasinqly forced to face the complexities of coherent imaqinq of what are essentially phase objects. Most electron microscopists are now aware that, for very thin weakly scatterinq objects such as thin unstained bioloqical specimens, hiqh resolution imaqes are best obtained near the optimum defocus, as prescribed by Scherzer, where the phase contrast imaqe qives a qood representation of the projected potential, apart from a lack of information on the lower spatial frequencies. But phase contrast imaqinq is never simple except in idealized limitinq cases.

Toward an alignment of the actin molecule within the actin filament

1983 ◽  
Vol 41 ◽  
pp. 450-451
Author(s):  
P.R. Smith ◽  
W.E. Fowler ◽  
U. Aebi
Keyword(s):  
Actin Filament ◽  
Diffraction Data ◽  
Quantitative Estimate ◽  
Molecular Model ◽  
Quantitative Comparison ◽  
Regulatory Proteins ◽  
Essential Information ◽  
X Ray ◽  
Maximum Resolution ◽  
Lack Of Information

An understanding of the specific interactions of actin with regulatory proteins has been limited by the lack of information about the structure of the actin filament. Molecular actin has been studied in actin-DNase I complexes by single crystal X-ray analysis, to a resolution of about 0.6nm, and in the electron microscope where two dimensional actin sheets have been reconstructed to a maximum resolution of 1.5nm. While these studies have shown something of the structure of individual actin molecules, essential information about the orientation of actin in the filament is still unavailable.The work of Egelman & DeRosier has, however, suggested a method which could be used to provide an initial quantitative estimate of the orientation of actin within the filament. This method involves the quantitative comparison of computed diffraction data from single actin filaments with diffraction data derived from synthetic filaments constructed using the molecular model of actin as a building block. Their preliminary work was conducted using a model consisting of two juxtaposed spheres of equal size.

The innervation of toad lymph hearts: An ultrastructural study

1992 ◽  
Vol 50 (1) ◽  
pp. 898-899
Author(s):  
A.M. Pucci ◽  
C. Fruschelli ◽  
A. Rebuffat ◽  
M. Guarna ◽  
C. Alessandrini ◽  
...  
Keyword(s):  
Ultrastructural Study ◽  
Neuromuscular Junctions ◽  
Nerve Fibers ◽  
Lack Of Information ◽  
Lymph Heart ◽  
Muscular Pump ◽  
Structure And Ultrastructure ◽  
Heart Wall

Amphibians have paired muscular pump organs, called “lymph heart”, which rhythmically pump back the lymph from the large subcutaneous lymph sacs into the veins. The structure and ultrastructure of these organs is well known but to date there is a lack of information about the innervation of lymph hearts. Therefore has been carried out an ultrastructural study in order to study the distribution of the nerve fibers, and the morphology of the neuromuscular junctions in the lymph heart wall.

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