scholarly journals Updated Iberian Archeomagnetic Catalogue: New Full Vector Paleosecular Variation Curve for the Last Three Millennia

2018 ◽  
Vol 19 (10) ◽  
pp. 3637-3656 ◽  
Author(s):  
A. Molina-Cardín ◽  
S. A. Campuzano ◽  
M. L. Osete ◽  
M. Rivero-Montero ◽  
F. J. Pavón-Carrasco ◽  
...  
Keyword(s):  
Paleosecular Variation ◽  
Variation Curve ◽  
Full Vector

First archaeointensity reference paleosecular variation curve for South America and its implications for geomagnetism and archaeology

2019 ◽  
Vol 92 (1) ◽  
pp. 81-97 ◽  
Author(s):  
Avto Goguitchaichvili ◽  
Catriel Greco ◽  
Rafael Garcia Ruiz ◽  
Lucas Pereyra Domingorena ◽  
Ruben Cejudo ◽  
...  
Keyword(s):  
South America ◽  
Absolute Intensity ◽  
Quality Parameters ◽  
Reference Curve ◽  
Paleosecular Variation ◽  
Variation Curve ◽  
Catamarca Province ◽  
Radiometric Ages ◽  
The Last Two Millennia ◽  
Good Agreement

AbstractWe report comprehensive rock-magnetic and archaeointensity investigations from 21 well-constrained pottery fragments from the Catamarca province of northwest Argentina. The absolute ages of the studied sites are ascertained by several high-quality radiometric ages and range between 1940 to 114014C yr BP. Magnetic mineralogy experiments indicates that the remanence is carried by thermally stable Ti-poor titanomagnetites. Forty-seven samples belonging to 11 out of 98 studied potsherds yielded reliable absolute intensity determinations judging from the quality parameters associated with the Thellier double-heating experiments. Moreover, we analyzed the available absolute geomagnetic intensities associated with the radiometric ages to construct the first intensity paleosecular variation curve (PSVC) for South America using thermoremanent magnetization carried by burned archaeological artifacts obtained in the present investigation and 79 other selected archaeointensities (out of 213 published in the literature). The dataset is used to build the PSVC reference curve by combined bootstrap and temporal P-spline methods. The variation curve shows significant differences with the global prediction model SHA.DIF.14k mainly based on the GEOMAGIA database. This intensity PSVC curve shows reasonably good agreement with paleosecular variation curves for Europe between 850 through 1150 BC and for Asia between 1000 and 1500 BC. This regional curve may be used as most reliable archaeomagnetic dating tool for the major part of South America (Peru, Brazil, Argentina, Chile, and Bolivia) for the last two millennia.

scholarly journals First archaeointensity reference paleosecular variation curve for South America and its implications for geomagnetism and archaeology – Corrigendum

2020 ◽  
Vol 98 ◽  
pp. 103-103
Author(s):  
Avto Goguitchaichvili ◽  
Catriel Greco ◽  
Rafael Garcia Ruiz ◽  
Lucas Pereyra Domingorena ◽  
Ruben Cejudo ◽  
...  
Keyword(s):  
South America ◽  
Paleosecular Variation ◽  
Variation Curve

Paleosecular variation record of geomagnetic full vector during late Miocene, from the Nayarit area, Mexico

2002 ◽  
Vol 134 (1-2) ◽  
pp. 71-88 ◽  
Author(s):  
Avto Goguitchaichvili ◽  
Luis M Alva Valdivia ◽  
Jose Rosas Elguera ◽  
Jaime Urrutia Fucugauchi ◽  
Miguel Angel Cervantes ◽  
...  
Keyword(s):  
Late Miocene ◽  
Paleosecular Variation ◽  
Full Vector

The first full vector palaeosecular variation curve for Italy based on revised data from archaeological material and volcanic rocks

2020 ◽  
Author(s):  
Evdokia Tema ◽  
Philippe Lanos
Keyword(s):  
Geomagnetic Field ◽  
Western Europe ◽  
Volcanic Rocks ◽  
Quality Data ◽  
Intensity Curve ◽  
High Quality ◽  
Archaeological Material ◽  
Variation Curve ◽  
Full Vector

<p>A new full-vector palaeosecular variation curve for Italy is presented based on a selection of high-quality data from sites within a 1000 km radius around Viterbo. The intensity and direction curves were calculated separately, using an updated compilation of Italian archaeomagnetic data from both archaeological material and volcanic rocks. The quality of the data was carefully evaluated, with particular attention on the reliability of the dating of the volcanic rocks and on the quality of the archaeointensity determinations. Only data from volcanic rocks of undisputable age have been considered. The new curves were calculated using Bayesian statistics and cover the last three millennia. The directional curve is very well constrained whilst the intensity curve is characterized by a larger error envelope, highlighting the need for new high-quality intensity data from Italy. Despite the limited number of reference data, the Italian intensity curve confirms periods with high intensity values of around 80 μT at 800-700 BC and 700-800 AD, in accordance with the geomagnetic intensity spikes previously identified in Middle East and Western Europe. Thanks to the privileged geographical position of the Italian peninsula, situated almost in the center of the Mediterranean, the Italian secular variation (SV) curves were used to analyze the evolution of the geomagnetic field in Europe by comparing them with other recently published SV curves for Western and Eastern Europe and with geomagnetic field models. The new curves can be used for archaeomagnetic dating not only in Italy but also in other countries of Europe such as Croatia, Slovakia and Serbia where no local SV curves are available so far.</p>

scholarly journals Addressing the challenges in projects of water treatment plants and storage of potable water: a case studies of the water supply system in the state of Goiás, Brazil

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Anne Louise de Melo Dores ◽  
Felipe Corrêa Veloso dos Santos
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
Treatment Plant ◽  
Water System ◽  
Treatment Phase ◽  
Water Treatment Plant ◽  
Operating Efficiency ◽  
Water Supply Systems ◽  
Storage Tanks ◽  
Variation Curve

AbstractTo elaborate efficient and economical water supply systems is one of the main objectives in the sanitation companies water system projects. In order to address the challenges faced in reaching this objective, this study aims to identify, first, the relation between the percentage of non-conformed samples in treated water and the inefficiency of the filtering units installed in the water treatment plant, and second, if, by drawing the consumption variation curve it is the most efficient way to predict the storage tanks volume—comparing necessary capacity, determined by the consumption curve, and installed capacity, predict by the outdated Brazilian normative. In order to reach answers for these two questions, this study measured the operating efficiency of the treatment plant as well as have set a quantitative comparison between the two dimensioning criteria for storage tanks volume present in the literature. As a result, the analysis provided the authors to detect a focus of contamination in the single-layered filtering units, limited by the filtering capacity of 2–6 m3/(m2 day), whilst operating at 333.13 m3/(m2 day). As well as to detect by the drawing of the consumption variation curve an oversize of 68% and 60% in the dimensioning of the studied storage tanks. With the results provided by this analysis approach, it was possible to efficiently detect and correct critical impairments in the treatment phase and to conclude that a long-term analysis should be drawn in order to affirm if the consumption variation curve is the best design methodology for the reservoirs.

Educational Model for the Kinematic Study of Non-Circular Gears

2013 ◽  
Vol 332 ◽  
pp. 297-304
Author(s):  
Liviu Ciupitu
Keyword(s):  
Numerical Methods ◽  
Industrial Applications ◽  
Point Of View ◽  
Spur Gears ◽  
Test Rig ◽  
Educational Model ◽  
Educational Test ◽  
Kinematic Study ◽  
Variation Curve ◽  
Noncircular Gears

The noncircular gears are used more and more in industrial applications. The paper presents an educational test rig for the kinematic study of non-circular gears. Two gears are studied from kinematic theoretically point of view: a gear with identically oval spur gears and another gear with identically elliptical spur gears, and simulation diagrams are presented. As for the testing rig, a gear with identically oval spur gears has been used. The researchers are able to draw with high precision the variation curve of output angle with respect to input angle. By using numerical methods for integration and differentiation other diagrams could be drawn and a comparation with simulation diagrams could be made.

Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina)

2011 ◽  
Vol 55 (2) ◽  
pp. 279-309 ◽  
Author(s):  
Mabel Mena ◽  
Avto Goguitchaichvili ◽  
Miguel Cervantes Solano ◽  
Juan Francisco Vilas
Keyword(s):  
Early Cretaceous ◽  
Paleosecular Variation
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