In this paper we present a method for optical paper surface roughness measurement, which overcomes the disadvantages of the traditional methods. Airflow-based roughness measurement methods and profilometer require expensive special equipment, essential laboratory conditions, are contact-based and slow and unsuitable for on-line control purposes methods. We employed an optical microscope with a built-in CCD-camera to take images of paper surface. The obtained image is considered as a texture. We applied statistical brightness measures and fractal dimension analysis for texture analysis. We have found a strong correlation between the roughness and a fractal dimension. Our method is non-contact-based, fast and is suitable for on-line control measurements in the paper industry.

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"This article explores the little studied and partially unpublished literary corpus of Kallistos Angelikoudes, one of the most fascinating late Byzantine hesychast authors. It addresses some of the problems associated with the manuscript tradition of his writings and offers a new approach to the systematization of his oeuvre. Despite the uncertainty regarding the identification of the two groups of texts that make up the “books” of Angelikoudes’ literary corpus, that is, the Hesychastic Education and the Hesychastic Consolation, this article advances an argument with regard to the possible composition of these works. Keywords: Kallistos Angelikoudes, Discourses, Chapters, Byzantine hesychasm, Mount Athos, Philokalia, manuscript tradition, genres of Byzantine theological literature, ascetic miscellanea "

The article deals with one of the oldest manuscripts containing a significant part of the theological chapters of Kallistos Angelikoudes, one of the most important hesychast authors of the late Byzantine period. Codex Vatopedinus gr. 610 was written in the late 14th c. It contains a great amount of quotations excerpted from Patristic literature. In the second part of the codex, one can find the chapters of Kallistos Angelikoudes; these 92 chapters were retrieved from a greater collection containing now about 200 chapters. The article discusses the content of the Vatopedi manuscript, pointing out to the use of many Patristic fragments included there in different works by Kallistos Angelikoudes. This may shed light on the origin and purpose of the manuscript. A further study of the history of the text of these chapters allows us to assess the place of the Vatopedi codex in the manuscript tradition of Kallistos Angelikoudes’ literary legacy. The Church Slavonic translation of this collection of Angelikoudes’ chapters made by Paisius Velichkovsky in the 1770—1790s reproduces many peculiarities of the Greek text contained in the Vatopedi manuscript and was presumably based on a copy of that codex.