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# Geometric interpretation and precision analysis of algebraic ellipse fitting using least squares method

Acta Geodaetica et Geophysica Hungarica
Authors: O. Kurt and O. Arslan

This paper presents a new approach for precision estimation for algebraic ellipse fitting based on combined least squares method. Our approach is based on coordinate description of the ellipse geometry to determine the error distances of the fitting method. Since it is an effective fitting algorithm the well-known Direct Ellipse Fitting method was selected as an algebraic method for precision estimation. Once an ellipse fitted to the given data points, algebraic distance residuals for each data point and fitting accuracy can be computed. Generally, the adopted approach has revealed geometrical aspect of precision estimation for algebraic ellipse fitting. The experimental results revealed that our approach might be a good choice for precision estimation of the ellipse fitting method.

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# A strategy for optimum designing of the geodetic networks from the cost, reliability and precision views

Acta Geodaetica et Geophysica Hungarica
Authors: M. Eshagh and R. Kiamehr

There are different criteria for designing a geodetic network in an optimal way. An optimum network can be regarded as a network having high precision, reliability and low cost. Accordingly, corresponding to these criteria different single-objective models can be defined. Each one can be subjected to two other criteria as constraints. Sometimes the constraints can be contradictory so that some of the constraints are violated. In this contribution, these models are mathematically reviewed. It is numerically shown how to prepare these mathematical models for optimization process through a simulated network. We found that the reliability model yields small position changes between those obtained using precision respectively. Elimination of some observations may happen using precision and cost model while the reliability model tries to save number of observations. In our numerical studies, no contradictions can be seen in reliability model and this model seems to be more suitable for designing of the geodetic and deformation networks.

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# U-series dating and isotope geochemical study of the Gellért Hill (Budapest) travertine

Central European Geology
Authors: Sándor Kele, Gyula Scheuer, Attila Demény, Chuan-Cou Shen, and Hong-Wei Chiang

.W. Taylor G.J. Wasserburg 1988 Dating earthquakes with high-precision thorium- 230 ages of very young corals Earth and Planetary Science Letters

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# Stable isotope compositions of the Penninic ophiolites of the Kõszeg-Rechnitz series

Central European Geology
Authors: Attila Demény, Torsten W. Vennemann, and Friedrich Koller

M.J. Spicuzza 1995 UWG-2, a garnet standard for oxygen isotope ratios: Strategies for high precision and accuracy with laser heating Geochimica et Cosmochimica Acta

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# New chronological and malacological data from the Quaternary of the Sárrét area, Transdanubia, Hungary

Acta Geologica Hungarica
Author: Pál Sümegi

8 11 12 Hertelendi, E., É. Csongor, L. Záborszky, I. Molnár, I. Gál, M. Győrffy, S. Nagy 1989: Counting system for high precision C-14 dating

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# A new paleobotanical method for the description of Late Quaternary organic sediments (Mire-development pathways and paleoclimatic records from S Hungary)

Acta Geologica Hungarica
Authors: Gusztáv Jakab, Pál Sümegi, and Enikő Magyari

53 191 201 Hertelendi, E., E. Csongor, L. Záborszky, I. Molnár, I. Gál, M. Györffy, S. Nagy 1989: Counting system for high precision C-14 dating

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# Stable isotope compositions of bivalve shells and geochemistry of bulk sediments in a 5–20 ky fluvial section at Körösladány, SE Hungary: Sedimentary changes vs. climate signals

Central European Geology
Authors: Attila Demény, Gabriella Schöll-Barna, Pál Sümegi, Péter Sipos, István Fórizs, Brigitta Réka Balázs, Bernadett Bajnóczi, and Gordon Cook

. Nagy 1989 Counting system for high precision C-dating Radiocarbon 32 399 408 . E

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# Recently forming stalagmites from the Baradla Cave and their suitability assessment for climate–proxy relationships

Central European Geology
Authors: Attila Demény, Alexandra Németh, Zoltán Kern, György Czuppon, Mihály Molnár, Szabolcs Leél-Őssy, Mihály Óvári, and József Stieber

, the variations are close to the analytical precision, hence these are not significant. The average values are more negative than the annual average of amount weighted precipitation compositions, suggesting more contribution from cold season

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# On the use of nominally anhydrous minerals as phenocrysts in volcanic rocks: A review including a case study from the Carpathian–Pannonian Region

Central European Geology
Authors: Zsófia Pálos, István János Kovács, Dávid Karátson, Tamás Biró, Judit Sándorné Kovács, Éva Bertalan, Anikó Besnyi, György Falus, Tamás Fancsik, Martina Tribus, László Előd Aradi, Csaba Szabó, and Viktor Wesztergom

about 150 μm. The thicknesses were measured with a Mitutoyo Digital micrometer with a precision of ±1 μm in the range of 0–20 mm. The thin sections were removed from the glass slides with acetone. To remove the traces of acetone, the samples were heated

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# Statistical process control in the evaluation of geostatistical simulations

Central European Geology
Author: János Geiger

) the aspect of uncertainty or the “statistic” being quantified and (b) the precision required for the uncertainty assessment. They used two parameters in their analysis: (a) the deviation, Δ F , in units of cumulative probability, from the reported quantile

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