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The goal of this paper is to determine and analyze the common geocenter signal from the geocenter coordinates based on four independent techniques: Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), Global Navigation Satellite System (GNSS), Gravity Recovery And Climate Experiment with the ocean bottom pressure model, and Satellite Laser Ranging, and to analyze the residuals as the differences between these geocenter coordinates and their common signal. Another objective of this paper is to compute variable amplitudes and phases of the annual and semi-annual oscillations in the geocenter coordinates of these techniques by the combination of the Fourier Transform Band Pass Filter (FTBPF) with the Hilbert Transform (FTBPF + HT) and to compare their mean values with those obtained by other authors. It was assumed that the geocenter time series of individual techniques consist of the common signal of geocenter motion, systematic errors resulting from orbital modeling and noise. Generally, the annual oscillation amplitudes in these techniques computed by the FTBPF + HT vary in time and their mean values are of the order of 2 mm for the X coordinate, 2.4–3.6 mm for the Y coordinate and 2.8–5.6 mm for the Z coordinate and the semi-annual oscillation amplitude is variable and about two times smaller than the annual one. The phases of these two oscillations are also variable, there are differences in their mean values for different techniques and the semi-annual oscillation phases changes throughout the entire phase range. To detect the common geocenter signal the wavelet-based semblance filtering (WBSF) method was applied. The weighted mean model was computed from all geocenter coordinate pairs from individual techniques assuming weights as inversely proportional to the variances of differences between the geocenter coordinates and their corresponding WBSF outputs. The average and median models computed from these outputs show a good agreement with the weighted mean model and generally, the average amplitudes of the annual signal in these models are of the order of 2 mm in each geocenter coordinate. The FTBPF amplitude spectra of these models reveals the retrograde annual oscillation in the XY equatorial plane. The FTBPF and FTBPF + HT amplitude spectra of geocenter time series and their residuals show mainly the maxima of different heights in the annual frequency band. The annual oscillations left in all residuals and oscillations with period less than ~ 120 days in DORIS and GNSS amplitude spectra may be caused by systematic errors of techniques resulting from mis-modeling of satellite orbits.

The scope of the examination of the actual condition, and the examination of the legal status of real estate property has long raised practical doubts and dilemmas. In particular, the issue of the expert’s obligation to take into account irregularities in construction proceedings raises a number of reservations. In the first part of the article, the concept of illegal construction works (performed without a building permit) had been presented; the duties of the appraiser provided for in the Real Estate Management Act were listed; the consequences of illegal construction works performed without a building permit, and other defects in the construction process were described, as well as difficulties in determining whether a given object had in fact been illegally constructed. Examples of decisions and permits issued in the construction process and their significance for the property appraiser were discussed. The second part of the article analyses the impact of the building permit on the price of the real estate property and discusses the scope of the obligation for the property appraiser to examine the compliance of the valued property with building regulations. Examples of bank’s requirements for property appraisers are indicated, and the problem of the practical significance of clauses included in real estate appraisal reports are presented. The discussion of all the above issues concludes with a summary. As a rule, a real estate property appraiser is not a person authorized to assess whether a given object, in whole or in part, has been built or is being used in accordance with building regulations. The appraiser, due to the statutory duty to exercise special diligence appropriate to the professional nature of his or her activities, is required to collect and use all necessary and available data on the given real estate property. If a discrepancy is found in the analysed documentation, the appraiser should mention it in the report. The appraiser is neither entitled nor obliged to determine the causes of the discrepancies. The indicated circumstances justify the inclusion in the report a clause that the valuation of the property in question may change due to discrepancies revealed, or proceedings being conducted. Failure to provide relevant information and reservations may justify the expert’s liability under the applicable provisions of the Civil Code.

The leaves, inflorescences, and fruits of hawthorn have long been known for their therapeutic properties. A wide range of hawthorn products, including liqueurs, are manufactured, due to the technological potential of the raw material as well as the richness of its volatile compounds. This study aimed to determine the effect of the liqueur production method and various methods of fruit preservation on the quantitative and qualitative composition of volatile compounds in the liqueurs produced. Hawthorn fruits saturated with sucrose and non-saturated with sucrose, fresh or preserved through one of three methods: freezing, air-drying, and freeze-drying, were used for liqueur preparation. The samples were analyzed using a gas chromatograph–mass spectrometer. They were found to contain 54 volatile compounds classified into 12 groups of chemicals. All 54 identified volatile compounds were detected in the liqueur made from hawthorn fruits non-saturated with sucrose and preserved by freeze-drying. In this liqueur type, 12 of the identified volatile compounds occurred in the highest concentration when compared to the other treatments. Among all volatiles, the following compounds were present in the analyzed liqueurs in the highest concentrations: dodecanoic acid ethyl ester (11.782 g/100 g), lactones (6.954 g/100 g), five monoterpenes (3.18 g/100 g), two aromatic hydrocarbons (1.293 g/100 g), isobensofuran (0.67 g/100 g), alcohol—2-methyl-2-propanol (0.059 g/100 g), and malonic ester (0.055 g/100 g). Among all analyzed liqueurs, the one made from the fruits non-saturated with sucrose and frozen was characterized by the smallest diversity of volatiles, which were present in the lowest concentrations in that liqueur.