scholarly journals Integrated geophysical survey for the geological structural and hydrogeothermal study of the North-western Gargano promontory (Southern Italy)

1996 ◽  
Vol 39 (1) ◽  
Author(s):  
M. Loddo ◽  
R. Quarto ◽  
D. Schiavone
Keyword(s):  
Three Dimensional ◽  
Flow Characteristics ◽  
Data Interpretation ◽  
Geophysical Survey ◽  
The North ◽  
Gargano Promontory ◽  
Fluid Flow Characteristics ◽  
Integrated Geophysical Survey ◽  
Self Potential ◽  
North Western

A multimethodological geophysical survey was performed in the north-western part of the Gargano promontory to study the geological structural setting and the underground fluid flow characteristics. The area has a complex tectonics with some magmatic outcrops and shallow low-enthalpy waters. Electrical, seismic reflection, gravimetric and magnetic surveys were carried out to reconstruct the geological structures; and in order to delineate the hydrogeothermal characteristics of the area, the self-potential survey was mainly used. Moreover magnetic and self-potential measurements were also performed in the Lesina lake. The joint three-dimensional interpretation of the geophysical data disclosed a large horst and graben structure covering a large part of the area. In the central part of the horst a large ramified volcanic body was modelled. The models show some intrusions rising from it to or near to the surface. The main structures are well deep-seated in the Crust and along them deep warm fluids rise as the SP data interpretation indicates.

scholarly journals Integrated geophysical surveys to assess the structural conditions of a karstic cave of archaeological importance

2005 ◽  
Vol 5 (1) ◽  
pp. 17-22 ◽  
Author(s):  
G. Leucci ◽  
L. De Giorgi
Keyword(s):  
Carbonate Rock ◽  
Data Interpretation ◽  
Geophysical Survey ◽  
Resistivity Tomography ◽  
Scattered Energy ◽  
Geophysical Surveys ◽  
The Stability ◽  
Geotechnical Tests ◽  
Ground Penetrating ◽  
Integrated Geophysical Survey

Abstract. An integrated geophysical survey using both the electrical resistivity tomography (ERT) and ground-penetrating radar (GPR) methods was undertaken over a cave of great archaeological interest in southern Italy. The survey was performed to assess the stability of the carbonate rock roof of the cave. A geophysical survey was preferred to boreholes and geotechnical tests, in order to avoid the risk of mass movements. The interpretation of integrated data from ERT and GPR resulted in an evaluation of some of the electromagnetic (EM) characteristics (such as the EM wave velocity) and the detection of discontinuities (fractures) in the carbonate rock. It is well known that rock fractures constitute a serious problem in cave maintenance, and progressive cracking within the bed rock is considered to be one of the main causes of collapse. An analysis of the back-scattered energy was also required for the GPR data interpretation. Cracks within the bedrock were detected to a depth of about 2 m by using GPR, which allowed for the identification of the loosened zone around the cave.

scholarly journals Mathematical Modelling of the Initial Mold Filling with Utilization of an Angled Runner

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 693 ◽  
Author(s):  
Jun Yin ◽  
Mikael Ersson ◽  
Huahai Mao ◽  
Pär G. Jönsson
Keyword(s):  
Mathematical Model ◽  
Flow Pattern ◽  
Mold Flux ◽  
Effective Means ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Metallic Inclusion ◽  
Filling Stage ◽  
Runner Design ◽  
Fluid Flow Characteristics

The flow pattern plays a crucial role in the uphill teeming process. The non-metallic inclusion generation due to interaction with the mold flux is believed to be influenced by the flow pattern. In this study, a three-dimensional mathematical model of the filling of a gating system for 10, 20, and 30 degrees angled runners was used to predict the fluid flow characteristics. Moreover, a mathematical model with a horizontal runner was applied as a reference. The predictions indicate that the angled-runner-design decreases the hump height during the initial filling stage, which results in less entrapment of mold flux into the mold. Nevertheless, increasing the angle of runner can result in a lower hump height, while the 30 degree angled runner gives a much more stable increase of the hump height during the initial filling stage. Besides CFD calculations, some thermodynamic calculations are taken into account for the chemical reactions between liquid steel and gas. The results show that the bubble shrinks due to the fact that N and O are dissolved into steel. The present findings strongly suggest that changing the horizontal runner to an angled runner would be an effective means of reducing flow unevenness during the initial filling of ingots, if the added steel losses are deemed acceptable.

A method to measure three-dimensional substratum rugosity for ecological studies: an example from the date-mussel fishery desertification in the north-western Mediterranean

2006 ◽  
Vol 86 (4) ◽  
pp. 689-690 ◽  
Author(s):  
Valeriano Parravicini ◽  
Alessio Rovere ◽  
Marco Donato ◽  
Carlo Morri ◽  
Carlo Nike Bianchi
Keyword(s):  
Analysis Of Variance ◽  
Three Dimensional ◽  
Western Mediterranean ◽  
Ecological Studies ◽  
The North ◽  
And Control ◽  
The Impact ◽  
North Western ◽  
Italian Coast

The impact of date-mussel fishery on substratum rugosity was evaluated at Capo Noli and Isola di Bergeggi (Savona, north-western Italian coast) in the summer of 2004. A new measure of substratum rugosity was used as a surface-dependent index of complexity. The results were compared between impact and control sites using two-way analysis of variance and suggested that the mussel fishery reduces substratum complexity.

Three-Dimensional Laminar Heat Transfer and Fluid Flow Characteristics in the Entrance Region of a Rhombic Duct

1988 ◽  
Vol 110 (4a) ◽  
pp. 855-861 ◽  
Author(s):  
Y. Asako ◽  
M. Faghri
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Entrance Region ◽  
Perfect Agreement ◽  
Entry Length ◽  
Uniform Wall Temperature ◽  
Uniform Wall ◽  
Fluid Flow Characteristics

A solution methodology is developed to obtain three-dimensional fluid flow and heat transfer characteristics in the entrance region of a rhombic duct. Owing to the complexity of the geometry, the literature results are limited to the fully developed values. The numerical methodology is based on an algebraic coordinate transformation technique, which maps the complex cross section onto a rectangle, coupled with a calculation procedure for three-dimensional parabolic flows, which reduces the problem to a series of two-dimensional problems. The Nusselt number and friction factor results are obtained for boundary conditions of uniform wall heat flux and uniform wall temperature. The asymptotic values of the Nusselt numbers and friction factors approach the available fully developed results. The entry length results for the limiting case of φ = 90 deg are in perfect agreement with the available experimental and numerical results for a rectangular duct.

scholarly journals Remote Sensing of a Roman Pottery Workshop. Report on a Geophysical Survey Carried out in Crikvenica (Ancient Ad Turres, Croatia)

2017 ◽  
Vol 34 (2) ◽  
pp. 119-130 ◽  
Author(s):  
Fabian Welc ◽  
Goranka Lipovac Vrkljan ◽  
Ana Konestra ◽  
Tea Rosić
Keyword(s):  
Ground Penetrating Radar ◽  
Geophysical Survey ◽  
Anthropogenic Activity ◽  
The North ◽  
Magnetic Methods ◽  
North Eastern ◽  
Underground Infrastructure ◽  
Ancient Times ◽  
Ground Penetrating ◽  
North Western

Abstract The paper presents results of a geophysical survey conducted in Crikvenica, a town located at the north-eastern Adriatic Sea coast in Croatia. The main aim was to identify extent of a Roman pottery workshop discovered to the north of the present town, at the site known as “Igralište”. The performed magnetic and GPR surveys within the area of the modern playground in Crikvenica revealed a large number of anomalies that may be connected with anthropogenic activity during different periods, both in modern and ancient times. The first group consists of anomalies generated by remnants of the modern underground infrastructure. Magnetic and ground-penetrating radar maps revealed anomalies in the north-western part of the modern playground that can be very likely interpreted as remains of a large ceramic kiln dated back to the Roman Period, similar to the kiln discovered during the excavations located further to the north. Finally, the survey performed within the Crikvenica football stadium clearly indicates that the integration of different Ground Penetrating Radar and magnetic methods allows for a detailed and effective identification of buried archaeological structures in large areas.

High Resolution Microscopy of Multi-Layered Biological Crystals

1982 ◽  
Vol 40 ◽  
pp. 80-83
Author(s):  
H.A. Cohen ◽  
T.W. Jeng ◽  
W. Chiu
Keyword(s):  
High Resolution ◽  
Low Dose ◽  
Three Dimensional ◽  
Data Interpretation ◽  
Two Dimensional ◽  
Biological Objects ◽  
Density Maps ◽  
Density Map ◽  
Complex Crystal ◽  
High Resolution Microscopy

This tutorial will discuss the methodology of low dose electron diffraction and imaging of crystalline biological objects, the problems of data interpretation for two-dimensional projected density maps of glucose embedded protein crystals, the factors to be considered in combining tilt data from three-dimensional crystals, and finally, the prospects of achieving a high resolution three-dimensional density map of a biological crystal. This methodology will be illustrated using two proteins under investigation in our laboratory, the T4 DNA helix destabilizing protein gp32*I and the crotoxin complex crystal.

Sign in / Sign up

Export Citation Format

Share Document