Percentage of surface increasing when passing from 2D to 3D-space used as a morphologic parameter. Application to the study and characterization of the Sierra Norte de Puebla geological formations (Mexico)

2012 ◽  
Author(s):  
V. Ochoa-Tejeda ◽  
J-F Parrot ◽  
P. De Frapoint
Keyword(s):  
3D Space ◽  
Geological Formations ◽  
2D To 3D

scholarly journals From 2D to 3D Characterization of Ceramic Membranes

2012 ◽  
Vol 44 ◽  
pp. 517-520
Author(s):  
J. Vicente ◽  
Y. Wyart ◽  
P. Moulin
Keyword(s):  
Ceramic Membranes ◽  
2D To 3D

Mineralogical and physicochemical characterization of selected Portuguese Mesozoic-Cenozoic muddy/clayey raw materials to be potentially used as healing clays

Clay Minerals ◽  
2010 ◽  
Vol 45 (2) ◽  
pp. 229-240 ◽  
Author(s):  
M. Rebelo ◽  
F. Rocha ◽  
E. Ferreira Da Silva
Keyword(s):  
Physicochemical Properties ◽  
Mineral Water ◽  
Raw Materials ◽  
Physicochemical Characterization ◽  
Mineralogical Composition ◽  
Exchange Capacity ◽  
Water Mixture ◽  
X Ray Diffraction ◽  
Geological Formations

AbstractThe use of pelitic geological materials for the treatment of muscle-bone-skin pathologies, by application of a cataplasm made of clay and mineral water mixture, is currently receiving attention and interest from the general public and scientific community. In Portugal there are several natural occurrences of clays/muds which are used for pelotherapy and/or geotherapy. These are carried out either indoors (thalassotherapy and thermal centres) or outdoors, in natural sites generally located near the seaside. The aim of this study is to assess the mineralogical and physicochemical properties of Portuguese raw materials for therapeutic purposes. These materials were collected from different Portuguese Mesozoic-Cenozoic geological formations located in the neighbourhood of thermal centres or at beaches known from their empirical applications. X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS) were used to assess the mineralogical composition of these clays. Physicochemical properties, such as specific surface area, cation exchange capacity, plasticity/abrasiveness indices and heat diffusiveness were also determined. Having distinct geological ages and genesis, the materials examined are mainly illitic. Less abundant kaolinite and smectite are also present. With respect to their physicochemical properties, all samples have good thermal properties which make them potentially suitable for therapeutic or aesthetic purposes.

Methodology of preliminary safety assessments in the site selection procedure in Germany

2020 ◽  
Author(s):  
Wolfram Rühaak ◽  
Phillip Kreye ◽  
Eva-Maria Hoyer ◽  
Johanna Wolf ◽  
Florian Panitz ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Site Selection ◽  
Reactive Transport ◽  
Selection Procedure ◽  
Transport Modelling ◽  
Safety Requirements ◽  
Safety Assessments ◽  
High Level ◽  
Geological Formations

<p><span>In Germany, the site selection for a repository for radioactive waste in deep geological formations was (re-) started in 2017 with the Repository Site Selection Act coming into force. The Site Selection Act envisages preliminary safety assessments as a measure to ensure the safety of a considered site.</span></p><p><span>The focus of the presentation will be the methodology of the preliminary safety assessments as it is derived from the legal requirements. In this context, the Federal Ministry for Environment, Nature Conservation and Nuclear Safety published the draft of the regulation on the safety requirements for the disposal of high-level radioactive waste in summer 2019. Article 2 of this regulation contains the requirements for the implementation of preliminary safety assessments in the site selection procedure. One essential aspect is the systematical identification and characterization of uncertainties. We will discuss the key features of the handling of uncertainties in the site selection procedure, especially with regard to numerical reactive transport modelling. The German Site Selection Act is divided into several steps with increasing level of detail. The identification and quantification of uncertainties plays a major role to improve quality and plausibility in each step. Well-prepared explorations for instance, need to be addressed in a way to minimise data uncertainties. In addition, the handling of uncertainties in safety assessments on an international level is evaluated. </span></p>

Field Scale Characterization of Geological Formations Using Percolation Theory

2011 ◽  
Vol 92 (2) ◽  
pp. 357-372 ◽  
Author(s):  
Saeid Sadeghnejad ◽  
Mohsen Masihi ◽  
Akbar Shojaei ◽  
Mahmoudreza Pishvaie ◽  
Peter R. King
Keyword(s):  
Percolation Theory ◽  
Field Scale ◽  
Scale Characterization ◽  
Geological Formations

Application of generalized multifractal analysis for characterization of geological formations

2002 ◽  
Vol 14 (9) ◽  
pp. 2347-2352 ◽  
Author(s):  
Pham Ngoc Khue ◽  
Olaf Huseby ◽  
Antoine Saucier ◽  
Jiri Muller
Keyword(s):  
Multifractal Analysis ◽  
Geological Formations

scholarly journals OSCAR: a framework to identify and quantify cells in densely packed three-dimensional biological samples

2021 ◽  
Author(s):  
Mario ledesma-terron ◽  
Diego perez-dones ◽  
david G Miguez
Keyword(s):  
Biological Samples ◽  
Object Segmentation ◽  
Three Dimensional ◽  
Cell Types ◽  
Biological Tissues ◽  
Nuclear Marker ◽  
Quantitative Characterization ◽  
3D Space ◽  
Immunofluorescence Labeling

We have developed an Object Segmentation, Counter and Analysis Resource (OSCAR) that is designed specifically to quantify densely packed biological samples with reduced signal-to-background ratio. OSCAR uses as input three dimensional images reconstructed from confocal 2D sections stained with dies such as nuclear marker and immunofluorescence labeling against specific antibodies to distinguish the cell types of interest. Taking advantage of a combination of arithmetic, geometric and statistical algorithms, OSCAR is able to reconstruct the objects in the 3D space bypassing segmentation errors due to the typical reduced signal to noise ration of biological tissues imaged in toto. When applied to the zebrafish developing retina, OSCAR is able to locate and identify the fate of each nuclei as a cycling progenitor or a terminally differentiated cell, providing a quantitative characterization of the dynamics of the developing vertebrate retina in space and time with unprecedented accuracy.

scholarly journals Amplitude Recovery and Deconvolution of Chirp and Boomer Data for Marine Geology and Offshore Engineering

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5704
Author(s):  
Eleonora Denich ◽  
Aldo Vesnaver ◽  
Luca Baradello
Keyword(s):  
Wave Equations ◽  
Real Data ◽  
Image Resolution ◽  
Source Spectrum ◽  
Marine Geology ◽  
Data Types ◽  
Full Waveform ◽  
Source Signal ◽  
Geological Formations

The processing of Chirp data is limited by the usual recording of the signal envelope, which enhances its immediate visibility but prevents applying methods based on wave equations. This is normally not the case for Boomer data. However, both systems are monochannel instruments, which cannot estimate properly the propagation velocity of the signal in the rocks. In this paper, we present two theorems: the first one links the Chirp or Boomer source spectrum with an expected amplitude decay curve; the second one defines conditions for the deconvolution stability of the enveloped Boomer signal when the full waveform of the source signal is known. In this way, we can jointly process and integrate heterogeneous surveys including both data types. We validated the proposed algorithms by applying them to synthetic and real data. The presented tools can improve the image resolution and the characterization of geological formations in marine surveys by reflectivity anomalies, which are distorted by standard equalization methods.

scholarly journals Isolation and Characterization of Urease-Producing Soil Bacteria

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Eshetu Mekonnen ◽  
Ameha Kebede ◽  
Asefa Nigussie ◽  
Gessese Kebede ◽  
Mesfin Tafesse
Keyword(s):  
Gene Sequence ◽  
Growth Conditions ◽  
Rrna Gene ◽  
Bacterial Isolates ◽  
Isolation And Characterization ◽  
Urease Production ◽  
Profile Characteristics ◽  
Geological Formations ◽  
Ethiopian Soils

Urease is an enzyme produced by ureolytic microorganisms which hydrolyzes urea into ammonia and carbon dioxide. Microbial urease has wide applications in biotechnology, agriculture, medicine, construction, and geotechnical engineering. Urease-producing microbes can be isolated from different ecosystems such as soil, oceans, and various geological formations. The aim of this study was to isolate and characterize rapid urease-producing bacteria from Ethiopian soils. Using qualitative urease activity assay, twenty urease-producing bacterial isolates were screened and selected. Among these, three expressed urease at high rates as determined by a conductivity assay. The isolates were further characterized with respect to their biochemical, morphological, molecular, and exoenzyme profile characteristics. The active urease-producing bacterial isolates were found to be nonhalophilic to slightly halophilic neutrophiles and aerobic mesophiles with a range of tolerance towards pH (4.0–10.0), NaCl (0.25—5%), and temperature (20–40°C). According to the API ZYM assays, all three isolates were positive for alkaline phosphatase, leucine aryl amidase, acid phosphatase, and naphthol_AS_BI_phosphohydrolase. The closest described relatives of the selected three isolates (Isolate_3, Isolate_7, and Isolate_11) were Bacillus paramycoides, Citrobacter sedlakii, and Enterobacter bugandensis with 16S rRNA gene sequence identity of 99.0, 99.2, and 98.9%, respectively. From the study, it was concluded that the three strains appear to have a relatively higher potential for urease production and be able to grow under a wider range of growth conditions.

scholarly journals Characterization of Fibrous Mordenite: A First Step for the Evaluation of Its Potential Toxicity

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 769 ◽  
Author(s):  
Dario Di Giuseppe
Keyword(s):  
Surface Characteristics ◽  
International Agency ◽  
Precautionary Approach ◽  
Adverse Health Effects ◽  
In Vivo Tests ◽  
Pathogenic Agents ◽  
Geological Formations

In nature, a huge number of unregulated minerals fibers share the same characteristics as asbestos and therefore have potential adverse health effects. However, in addition to asbestos minerals, only fluoro-edenite and erionite are currently classified as toxic/pathogenic agents by the International Agency for Research on Cancer (IARC). Mordenite is one of the most abundant zeolites in nature and commonly occurs with a fibrous crystalline habit. The goal of this paper is to highlight how fibrous mordenite shares several common features with the well-known carcinogenic fibrous erionite. In particular, this study has shown that the morphology, biodurability, and surface characteristics of mordenite fibers are similar to those of erionite and asbestos. These properties make fibrous mordenite potentially toxic and exposure to its fibers can be associated with deadly diseases such as those associated with regulated mineral fibers. Since the presence of fibrous mordenite concerns widespread geological formations, this mineral fiber should be considered dangerous for health and the precautionary approach should be applied when this material is handled. Future in vitro and in vivo tests are necessary to provide further experimental confirmation of the outcome of this work.

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