Monocentricity and Directional Heterogeneity: A Conditional Parametric Approach

The basic monocentric city model implies a decreasing relationship between distance to the Central Business District and outcome variables such as population density, housing prices, land rent, and income. Implicitly, the monocentric model implies directional homogeneity, that is, the distance effect does not depend on the direction in which it is being measured. Only a few works have analyzed the problem of directional heterogeneity. A new conditional parametric approach is introduced to deal with the issue. We study how this approach performs under different spatial patterns comparing with several other methods. An application to the spatial distribution of wage income in the municipality of Madrid is carried out to illustrate the main characteristics of the method and to show the comparative advantages.     

Polish republicanism of the Four Year Seym at a doctrinal crossroads

The aim of the article is to analyse the most intellectually challenging conceptions of Polish political thought at the time of the Four Year Seym, specifically those of Stanis?aw Staszic and Hugo Ko???taj, when viewed from the perspective of the dilemmas of the republicanism of the period. At its heart, it places the issue so provocatively put forward by Rousseau’s Considérations sur le gouvernement de Pologne, that of reforming a previously noble republic against the monarchical tendencies that prevailed in Europe. The analysis shows that, indeed, in both reformers’ advocacy for the hereditary throne, having no other justification but geopolitical reasons, and especially in some Ko???taj’s later proposals, one can find evidence of their doctrinal compromises. On the other hand, their argumentations revealed an extraordinarily modern approach that could pave the way for new promising prospects of Polish republicanism. Its value lay mainly in the fact that they combined the ideals of more passionate civic (and military) patriotism with those of an economically free and active society. At any rate, all their endeavours can confirm, especially when juxtaposed with those of their political adversaries, that that tradition was approaching perhaps one of its most challenging turning points.     

Estimation of soil erosion on cultivated fields on the hilly Meghalaya Plateau,North-East India

The estimation of soil erosion rates in complex subtropical agricultural systems of hilly environment is difficult and most of the traditional methods have serious limitations. The ¹³⁷Cs technique allows to obtain relatively quickly retrospective medium term soil erosion results. The objective of this study was using ¹³⁷Cs approach to quantify soil loss under agricultural system which develops under growing human pressure on the hilly terrain of the Meghalaya Plateau. The measured values of caesium inventory for all sampling points are between 2% and 63% of the reference value of caesium inventory. The estimated annual soil loss for sampling points located on the slope are between 29 and 79 Mg·ha⁻¹·yr⁻¹ in the case of an improved mass balance model. It means that soil erosion in this manually tilled agricultural area cannot be neglected.     

Working on Rock Art in the Dakhleh Oasis: Some Thoughts on Threats to Petroglyphs and Possibilities of Research in the Western Desert,Egypt

The rock art in Dakhleh, despite being known for more than a century, has been thoroughly investigated only since the late 1980s, and remains far from being well known especially outside of Egypt. At the same time, the consecutive seasons of fieldwork conducted by the Petroglylph Unit (part of the international Dakhleh Oasis Project) have produced a great number of findings and substantially enhanced our knowledge of the petroglyphs of this area. Here, rather than focusing on interpretive aspects of the research, I wish to discuss the threats endangering the petroglyphs in the Oasis. Dakhleh has developed very intensively in the last 100 years. It is, however, the twenty-first century which seems to pose some serious threats to archaeological heritage. Hence, in this paper I wish to report on what has been done so far to document rock art in the Oasis, and try to establish the priorities for potential future work. The agricultural and infrastructural development in the area, and the uncertain political climate in the country, heavily influence the state of rock art preservation and the possibilities of research. The need for documentation and preservation of rock art is larger than ever before, because many changes in the local landscape cannot be stopped. The time is pressing, because more and more rock art is disappearing due to the reasons discussed in this paper. Threats to Egyptian rock art in general will form a background for considerations concerning petroglyphs from the Western Desert.     

Reconstruction of smelting conditions during 16th- to 18th-century copper ore processing in the Kielce region (Old Polish Industrial District) based on slags from Miedziana Góra,Poland

This study presents the first reconstruction of the smelting conditions in 16th- to 18th-century smelters from Miedziana Góra (Holy Cross Mountains, Poland). Based on geochemical (inductively coupled plasma mass spectrometry/emission spectrometry, X-ray fluorescence) and mineralogical analysis (X-ray diffractometry, scanning electron microscopy, electron probe micro-analysis) of historical slags, their chemical/phase composition and the basic smelting parameters (temperature, melt viscosity, and oxygen fugacity) were determined. Due to the differences in chemical and phase composition, slags from different smelting stages have been distinguished: hypocrystalline slags (MG6) from speiss/matte production and glassy (MG1–MG5) from matte conversion. In glassy slags, pyroxenes, quartz/cristobalite grains, and aggregates composed of metallic Cu and PbO are dispersed in the glass. Hypocrystalline slags are composed of wollastonites, anorthites, and metallic Cu. The temperature range at which the slags were formed was from ~1100°C (solidus temperature) to 1150–1200°C (liquidus temperature). The silicate melt's viscosity was from log η = 1.19 to 4.42 Pa s (at 1100–1200°C). The higher viscosity of MG1–MG5 slags indicates that, unlike MG6 slags, they were not formed during gravity separation. Information about the phase composition made it possible to determine the oxygen fugacity in the range of log fO₂ = −4 to −12 atm. High oxygen fugacity indicates the oxidizing nature of the smelting process.