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Jan Krynski, Tomasz Olszak, Marcin Barlik and Przemyslaw Dykowski

., Dykowski P., Walo J., Zak L., Szpunar R., Jerzejewska A., Marganski S., Prochniewicz D. & Drozdz M. (2011). Design and control survey of gravity control in Poland - first stage (in Polish). Technical report. Warsaw: Head Office of Geodesy and Cartography. Barlik, M., Krynski J., Olszak T., Sas A., Pachuta A., Cisak M., Prochniewicz D., Walo J. & Szpunar R. (2010). Modernization of Absolute Gravity Zero Order Network in Poland. IAG Symposium on Terrestrial Gravimetry: Static and Mobile Measurements (TG-SMM2010), 22-25 June 2010 (pp. 112-115). Saint

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Jan Krynski

-012-0009 Bogusz, J., Klos, A. and Kosek, W. (2013). Wavelet decomposition in the earth’s gravity field investigation. Acta Geodynamica et Geomaterialia, Vol. 10, No 1(169), 47-59, DOI 10.13168/AGG.2013.0004 Dykowski, P. (2012a). Vertical gravity gradient determination for the needs of contemporary absolute gravity measurements - first results. Reports on Geodesy, Vol. 92, No 1, 23-36. Dykowski, P. (2012b). Calibration of Relative Spring Gravimeters with the Use of the A10 Absolute Gravimeter, Symposium Gravity. Geoid and Height Systems GGHS2012

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Marek Kaczorowski, Tomasz Olszak, Janusz Walo and Marcin Barlik

and L. Xing.,2010, Results of the European Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2007. Gravity, Geoid and Earth Observation, Springer Berlin Heidelberg, Ed. Stelios, P. Mertikas, vol. 135, 31-35, 2010. Kaczorowski, M., 2006, High-Resolution Wide-Range Tiltmeter: Observations of Earth Free Oscillations Excited by the 26 December 2004 Sumatra -Andaman Earthquake. Monograph: - Earthquake Source Asymmetry, Structural Media and Rotation Effects. pp. 493- 520, Springer-Verlag Berlin Heidelberg

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Robert Tenzer, Hamayun and Peter Vajda

References Bassin C., Laske G., Masters G., 2000: The current limits of resolution for surface wave tomography in North America. EOS, Trans AGU 81:F897. Hackney R. I., Featherstone W. E., 2003: Geodetic versus Geophysical Perspectives of the 'Gravity Anomaly', Geophys. J. Int. , 154, 35-43. Mooney W. D., Laske G., Masters T. G., 1998: CRUST 5.1: A global crustal model at 5° × 5°. J. Geophys. Res. , 103B, 727-747. Pavlis N. K., Holmes S. A., Kenyon S. C

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Michal Mikolaj and Branislav Hábel

References Arnoso J., Vieira R., Vélez E. J., Van Ruymbeke M., Venedikov A. P., 2001: Studies of Tides and Instrumental Performance of Three Gravimeters at Cueva de los Verdes (Lanzarote, Spain). Journal of Geodetic Society of Japan, 47 , 70-75. Baker T. F., Bos M. S., 2003: Validating Earth and ocean tide models using tidal gravity measurements. Geophysical Journal International, 152 , 468-485. Crossley D., Hinderer J., Casula G., Francis O., Hsu H.-T., Imanishi Y., Jentzsch G., Kaarianen J., Merriam

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Hrvoje Jošić and Matej Metelko

References 1. Arnon, A., Weinblatt, J. (1998). Linder's hypothesis revisited: income similarity effects for low income countries. Applied Economics Letters, Vol. 5, No. 10, pp. 607-611. 2. Atabay, R. (2015). Validity of Linder Hypothesis in BRIC countries. Journal of International Trade, Logistics and Law, Vol. 1, No. 2, pp. 85-92. 3. Bo, P. (2013). Bilateral trade of China and the Linder hypothesis: A gravity model approach. Bachelor Thesis within Economics. Available at https

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G. Barbato, G. Genta, A. Germak, R. Levi and G. Vicario

. (1967). Statistical Models in Engineering. New York, USA: Wiley. Johnson, N. L. (1949). Systems of frequency curves generated by methods of translation. Biometrika , 36 (1/2), 149-176. Pearson, K. (1895). Contributions to the mathematical theory of evolution. II. Skew variation in homogeneous material. Philosophical Transactions of the Royal Society of London A , 186, 343-414. D'Agostino, G. (2005). Development and metrological characterization of a new transportable absolute gravimeter

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Jaroslaw Bosy and Jan Krynski

absolute gravity measurements - first results. Reports on Geodesy, Vol. 92, No 1, pp. 23-35. Dykowski, P. and Krynski, J. (2014). Quality assessment of the new gravity control in Poland - first estimate. The 3rd International Gravity Field Service (IGFS) General Assembly, Shanghai, China, 30 June - 6 July 2014; IAG Symposia Vol. 145, (ed.) P. Willis (submitted). Dykowski, P., Krynski, J. and Sekowski, M. (2013a). Gravimetric investigations at Borowa Gora Geodetic - Geophysical Observatory, Geophysical Research Abstracts, Vol. 15, EGU2013

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Mahmood Farzaneh-Gord and Hamid Rahbari

Developing novel correlations for calculating natural gas thermodynamic properties

Natural gas is a mixture of 21 components and it is widely used in industries and homes. Knowledge of its thermodynamic properties is essential for designing appropriate processes and equipment. This paper presents simple but precise correlations of how to compute important thermodynamic properties of natural gas. As measuring natural gas composition is costly and may not be effective for real time process, the correlations are developed based on measurable real time properties. The real time properties are temperature, pressure and specific gravity of the natural gas. Calculations with these correlations are compared with measured values. The validations show that the average absolute percent deviation (AAPD) for compressibility factor calculations is 0.674%, for density is 2.55%, for Joule-Thomson coefficient is 4.16%. Furthermore, in this work, new correlations are presented for computing thermal properties of natural gas such as enthalpy, internal energy and entropy. Due to the lack of experimental data for these properties, the validation is done for pure methane. The validation shows that AAPD is 1.31%, 1.56% and 0.4% for enthalpy, internal energy and entropy respectively. The comparisons show that the correlations could predict natural gas properties with an error that is acceptable for most engineering applications.

Open access

Branislav Hábel and Bruno Meurers

/POSEIDON altimetry. Eos, Transactions American Geophysical Union, 75, 16, 108 p. Egbert G. D., Erofeeva L., 2002: Efficient inverse modeling of barotropic ocean tides. Journal of Atmospheric and Oceanic Technology, 19, 2, 183-204. Francis O., 1997: Calibration of the C021 superconducting gravimeter in Membach (Belgium) using 47 days of absolute gravity measurements. In: International association of Geodesy Symp., Gravity, Geoid and Marine Geodesy, 117, 212-219. Francis O., Melchior P., 1996: Tidal loading in south