Marek Woźniak

The method of contact angle measurements and estimation of work of adhesion in bioleaching of metals.

In this paper, we present our method for the measurement of contact angles on the surface of minerals during the bioleaching process because the standard deviation obtained in our measurements achieved unexpectedly low error. Construction of a goniometer connected with a specially prepared computer program allowed us to repeat measurements several times over a short time course, yielding excellent results.After defining points on the outline of the image of a drop and its baseline as well of the first approximation of the outline of the drop, an iterative process is initiated that is aimed at fitting the model of the drop and baseline. In turn, after defining the medium for which measurements were made, the work of adhesion is determined according to Young-Dupré equation. Calculations were made with the use of two methods named the L-M and L-Q methods.

Shaping a city and its defenses; fortifications of Hellenistic Berenike Trogodytika

Key information on the location, size and dating of the Ptolemaic fortifications of Berenike Trogodytika comes from archaeological excavations carried out in 2013–2015, following the 2012 season when the presence of military architecture in the Red Sea harbor was first discovered and identified (Woźniak and Rądkowska 2014). Sections of a thick wall constructed of gypsum anhydrite blocks on a wide foundation were recorded in the northern part of the site (trenches BE-13/90 and BE13-93). The wall was part of the defenses protecting the harbor from the north, the only land access to the site through marshy ground on the fringes of the so-called “northern lagoon”. Further work in trenches BE14-97 in 2014 and BE15-104 in 2015 uncovered the remains of a well-preserved early Hellenistic fortified city gate, built of gypsum anhydrite blocks and chunks of coral. The complex has no parallel at present anywhere in the Red Sea region. A series of shallow basins interconnected by pipes made of truncated necks of early Hellenistic amphorae, found east of the gate, probably collected rainwater. The water function? of the gate was confirmed further by a large basin or cistern, about 1 m deep, abutting the complex on the southwest. A subterranean network of four rock-cut chambers was discovered at the bottom of the internal gate chamber. A corridor in the east wall of the gate shaft, with a covered channel in the floor, led off to the northeast, in the direction of a rectangular anomaly observed on the magnetic map, a possible second rock-cut shaft.

Accuracy analysis of a wireless indoor positioning system using geodetic methods

Abstract Ubisense RTLS is one of the Indoor positioning systems using an Ultra Wide Band. AOA and TDOA methods are used as a principle of positioning. The accuracy of positioning depends primarily on the accuracy of determined angles and distance differences. The paper presents the results of accuracy research which includes a theoretical accuracy prediction and a practical test. Theoretical accuracy was calculated for two variants of system components geometry, assuming the parameters declared by the system manufacturer. Total station measurements were taken as a reference during the practical test. The results of the analysis are presented in a graphical form. A sample implementation (MagMaster) developed by Globema is presented in the final part of the paper.

Investigation of Stability of Precise Geodetic Instruments Used in Deformation Monitoring

Abstract Monitoring systems using automated electronic total stations are an important element of safety control of many engineering objects. In order to ensure the appropriate credibility of acquired data, it is necessary that instruments (total stations in most of the cases) used for measurements meet requirements of measurement accuracy, as well as the stability of instrument axis system geometry. With regards to the above, it is expedient to conduct quality control of data acquired using electronic total stations in the context of performed measurement procedures. This paper presents results of research conducted at the Faculty of Geodesy and Cartography at Warsaw University of Technology investigating the stability of “basic” error values (collimation, zero location for V circle, inclination), for two types of automatic total stations: TDA 5005 and TCRP 1201+. Research provided also information concerning the influence of temperature changes upon the stability of investigated instrument’s optical parameters. Results are presented in graphical analytic technique. Final conclusions propose methods, which allow avoiding negative results of measuring tool-set geometry changes during conducting precise deformation monitoring measurements.

Archaeological fieldwork in Berenike in 2014 and 2015: from Hellenistic rock-cut installations to abandoned temple ruins

The report brings a comprehensive summary of archaeological fieldwork and survey carried out in Berenike on the Red Sea coast of Egypt and in the Eastern Desert hinterland over the course of two seasons in 2014 and 2015. The completed magnetic map of the site is discussed in some detail, assessing the potential for future excavations. The report covers the most important discoveries of the two seasons, which include fragments of Middle Kingdom Pharaonic stelae, possibly pushing back the foundation of the harbor, archaeological evidence of a rock-cut watercollection system forming part of the Hellenistic-age fortifications and two inscribed stone bases, one of which records a secretary of an aromatics warehouse at Berenike, discovered undisturbed in the courtyard of the Great Temple of Berenike (also called the Serapis Temple). A previously unknown religious(?) complex was discovered on the western outskirts of the site thanks to work with Corona satellite imagery. In turn, analysis of the magnetic mapping of the city revealed an administrative(?) complex in the northern part of the town; the later, 5th and 6th century layers were examined inside a chamber with niche forming part of this complex. Work also continued in the early Roman harbor, uncovering among others a complete timber ship frame, and a collection of garnets in subsidiary buildings in the late Roman temenos located in the entrance to the southwestern bay.

Berenike Project. Hellenistic fort, Roman harbor, late Roman temple, andother fieldwork: archaeological work in the 2012 and 2013 seasons

Brief overview of two seasons of archaeological survey and excavation carried out in 2012 and 2013 at the site of Berenike on the Red Sea coast and in two sub-projects in the Eastern Desert: the prehistoric cattle cemetery at Wadi Khashab and the Roman-era emerald mines at Sikait and Nugrus. Highpoints of the work at Berenike included discovery of the Hellenistic fort and fortifications that mark the original settlement of the site in the third quarter of the 3rd century BC, continued clearance of harbor-related structures in the southwestern bay interpreted as the early Roman harbor of Berenike and the uncovering of an earlier phase of the late Roman harbor temple (so-called Lotus Temple) of the 5th–6th century AD in the harbor.

Indian steel: a forgotten commodity of the great trade routes

Among numerous exotic goods carried along ancient trade routes the so-called Seric iron is one of the most mysterious and least known. According to ancient sources, it was imported from a half-mythical land of Serica. New discoveries in southern India suggest it should be identified with the kingdom of Chera (in modern Tamilnadu) which existed between 300 BC and AD 300. This metal, one type of which was the patterned Damascene steel, was used mainly in the production of high-quality weapons. From about the 3rd century AD local production centers of crucible steel emerged also outside India.