Resolution measures for 3D magnetic inversions

Geophysics ◽  
2016 ◽  
Vol 81 (2) ◽  
pp. J1-J9 ◽  
Author(s):  
Mark Pilkington
Keyword(s):  
Physical Properties ◽  
Theoretical Basis ◽  
3D Models ◽  
Magnetic Data ◽  
Limited Attention ◽  
Resolution Measure ◽  
Calculated Model ◽  
Geologic Information

Inversion of magnetic data into 3D models is becoming commonplace. The theoretical basis of the method is well established and has been extended to include constraints based on physical properties and geologic information. Nevertheless, only limited attention is paid to assessing the reliability of computed models, which usually involves deriving some measure of how well features within the models can be resolved. Resolution lengths determined from resolution matrices can be unrealistically small, suggesting that the recovered models are more reliable than they really are. One cause of this effect is the calculated model itself, which directly influences the character of the resolving functions. We have developed an approximate resolution measure not affected by the calculated model, and we found it to give more realistic resolving lengths. This approximation is computationally less demanding and can be calculated prior to inversion. It suggests that the resolution length is equal to the depth of the parameter or model feature of interest.

THE INTERPRETATION OF GEOPHYSICAL DATA

Geophysics ◽  
1937 ◽  
Vol 2 (2) ◽  
pp. 95-113 ◽  
Author(s):  
Ludwig W. Blau
Keyword(s):  
Physical Properties ◽  
Geophysical Methods ◽  
Present Knowledge ◽  
Geophysical Data ◽  
Surface Mapping ◽  
Contour Maps ◽  
Physical Effects ◽  
Data Result ◽  
Geologic Information

Geophysical data result from measurements of physical properties. The geophysicist postulates certain possible physical causes of the observed effects. The geologist reasons from observed geologic effects to geologic causes. The difficulties confronting the interpretation of physical effects as reflected in geophysical data in terms of geologic causes are pointed out. The author takes the position that geophysical data must be worked up independently. A competent geophysicist‐geologist may combine geophysical and geologic information in the preparation of a report which will then, and only when this procedure is followed, include all present knowledge of the area under investigation. The requirement that geophysical data be immediately translatable into geologic language and furnish material for drawing geologic contour maps is shown to be incompatible with the nature of geophysical data. Attention is drawn to the changing geophysical scene and to the tendency to use geophysical methods after they have ceased to be adequate for the solution of prospecting problems. It is suggested that geology can aid geophysics principally through library reconnaissance and advance surface mapping. Geophysics has become a serious competitor of geology in the search for oil, and the geophysic‐geological ecotone has advanced steadily into geologic territory.

Calculation and Plot of Predominance Area Phase Diagram for Cu-S-O Ternary System

2012 ◽  
Vol 503-504 ◽  
pp. 390-395
Author(s):  
Shang Yong Li ◽  
Yuan Hu ◽  
Gang Xie ◽  
Jun Han Li
Keyword(s):  
Phase Diagram ◽  
Phase Equilibrium ◽  
Physical Properties ◽  
Chemical Reactions ◽  
Phase Point ◽  
Two Phase ◽  
Clear Physical Meaning ◽  
Three Phase ◽  
Calculated Model ◽  
Phase Equilibrium Line

The typical chemical reactions of metal were analyzed in this paper, and the two-phase equilibrium line calculated model was obtained. By use of the physical properties database, the design of chemical reactions and the compounds were to be determined. Through the calculating the two-phase point and three-phase point ,the predominance area phase diagram algorithm based on the physical properties database was formed, which has clear physical meaning and accuracy calculation result, and also whose result was consistent with that of the literature.

Gravity and magnetic inversion with minimization of a specific functional

Geophysics ◽  
1984 ◽  
Vol 49 (8) ◽  
pp. 1354-1360 ◽  
Author(s):  
A. Guillen ◽  
V. Menichetti
Keyword(s):  
Physical Properties ◽  
Magnetic Data ◽  
Constant Density ◽  
Minimum Volume ◽  
Data Inversion ◽  
Gravity And Magnetic ◽  
Magnetic Inversion ◽  
Line Passing ◽  
Susceptibility Contrast ◽  
The Moment

The nonuniqueness of gravity or magnetic data inversion is well known. In order to remove ambiguity, some authors have sought solutions minimizing a functional describing geometrical or physical properties. Last and Kubik (1983), in particular, developed a method explaining the observed anomaly by structures of minimum volume. In this method the domain where anomalous sources are searched is divided into elementary prisms of a constant density or susceptibility contrast. Each elementary contrast is allowed to vary individually. Thus a contrast distribution is computed. The search for this kind of solution leads in general to geologically more appropriate bodies, but exceptions do occur. In this paper, the technique is broadened to include the search for solutions minimizing the moment of inertia with respect to the center of gravity or with respect to a given dip line passing through it. The resulting structures are both deeper and more compact, precisely as is required in specific cases. Theoretical and actual examples illustrate this flexible inversion technique.

scholarly journals Digitalization of garment in the context of circular economy

2021 ◽  
Vol 72 (01) ◽  
pp. 102-107
Author(s):  
ADINA VICTORIA ALBU ◽  
TUDOR CACIORA ◽  
ZHARAS BERDENOV ◽  
DORINA CAMELIA ILIES ◽  
BOGDAN STURZU ◽  
...  
Keyword(s):  
Physical Properties ◽  
Circular Economy ◽  
3D Models ◽  
Future Generations ◽  
Digital Method ◽  
Transmission Of Information ◽  
Different Ages ◽  
The Creation ◽  
Textiles And Clothing ◽  
Modern Artists

One of the principles of the circular economy is to recycle used or unused materials, in order to reuse them in the creation of new objects or the restoration of old ones. But due to the fragility, some of these materials, such as old textiles and clothing, are quite difficult to handle. This study presents a completely digital method with the help of which two pieces of clothing of different ages and physical properties, have been restored and stylized; the two pieces are made up of a traditional Romanian women’s shirt about 100 years old and a modern sports t-shirt. For the application of the principles of the circular economy, the restoration-stylization processes of the pieces were based on the material and ornaments collected digitally from a series of old Romanian towels, which are currently no longer used. For this we considered the creation of 3D models of all the materials considered by the method of photogrammetry in Agisoft Metashape 1.6.2 Professional Edition and their processing in MeshLab 2020.2, as well as the vectorization of traditional motifs in ArcGis 10.6. Such an approach limits to the minimum the numbers of attempts that the restores have at their disposal while also allowing the obtaining, storage and transmission of information about traditional textiles, aimed at capturing the imagination of modern artists and designers to restore them for future generations.

scholarly journals The Convective Rainfall Rate from Cloud Physical Properties Algorithm for Meteosat Second Generation Satellites: Microphysical Basis and Intercomparisons using an Object-Based Method

2019 ◽  
Author(s):  
Francisco J. Tapiador ◽  
Cecilia Marcos ◽  
Juan Manuel Sancho
Keyword(s):  
Physical Properties ◽  
Real Time ◽  
Theoretical Basis ◽  
Short Range ◽  
Second Generation ◽  
Rainfall Rate ◽  
Convective Rainfall ◽  
Object Based

The Convective Rainfall Rate from Cloud Physical Properties (CRPh) for Meteosat Second Generation Satellites is a day-only precipitation algorithm developed at the Spanish Meteorological Agency (AEMET) for EUMETSAT’ Satellite Application Facility in support to Nowcasting and Very Short Range Forecasting (NWC SAF). It is therefore mainly intended to provide input for monitoring and near-real-time forecasts for the next few hours. This paper critically discusses the theoretical basis of the algorithm with special emphasis in the empirical values and assumptions in the microphysics of precipitation and compares the performances of the CRPh with its antecessor, the Convective Rainfall Rate algorithm (CRR), using an object-based method. The analyses show that AEMET’s CRPh is physically consistent and that outperforms the CRR. The applicability of the algorithm for nowcasting and the challenges to evolve the product to an all-day algorithm are also presented.

scholarly journals Amorphous materials based on perovskite ferroelectrics

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
S.A. Gridnev ◽  
L.N. Korotkov
Keyword(s):  
Thin Film ◽  
Physical Properties ◽  
Structural Relaxation ◽  
Perovskite Structure ◽  
Theoretical Basis ◽  
Amorphous Materials ◽  
Ferroelectric Phase ◽  
Glassy State ◽  
Crystalline Solids ◽  
Bulk State

The methods of preparation, as well as the structure and most relevant physical properties of amorphous materials based on ferroelectrics with perovskite structure are reviewed. The theoretical basis for the possibility of ferroelectricity in non-crystalline solids is discussed. The structural relaxation in a glassy state and the crystallization processes leading to the formation of a ferroelectric phase are considered. The structure and physical properties of thin-film amorphous ferroelectrics that demonstrate noticeable differences from the properties of the same materials in bulk state are discussed separately

scholarly journals The Convective Rainfall Rate from Cloud Physical Properties Algorithm for Meteosat Second-Generation Satellites: Microphysical Basis and Intercomparisons using an Object-Based Method

2019 ◽  
Vol 11 (5) ◽  
pp. 527 ◽  
Author(s):  
Francisco Tapiador ◽  
Cecilia Marcos ◽  
Juan Sancho
Keyword(s):  
Physical Properties ◽  
Real Time ◽  
Theoretical Basis ◽  
Short Range ◽  
Second Generation ◽  
Rainfall Rate ◽  
Convective Rainfall ◽  
Object Based

The convective rainfall rate from cloud physical properties (CRPh) algorithm for Meteosat second-generation satellites is a day-only precipitation algorithm developed at the Spanish Meteorological Agency (AEMET) for EUMETSAT’ Satellite Application Facility in support of nowcasting and very short-range forecasting (NWC SAF). It is therefore mainly intended to provide input for monitoring and near-real-time forecasts for a few hours. This letter critically discusses the theoretical basis of the algorithm with special emphasis on the empirical values and assumptions in the microphysics of precipitation, and compares the qualitative performances of the CRPh with its antecessor, the convective rainfall rate algorithm (CRR), using an object-based method applied to a case-study. The analyses show that AEMET’s CRPh is physically consistent and outperforms the CRR. The applicability of the algorithm for nowcasting and the challenges of improving the product to an all-day algorithm are also presented.

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