Capillary pressure of van der Waals liquid nanodrops

The dependence of the surface tension on a nanodrop radius is important for the new-phase formation process. It is demonstrated that the famous Tolman formula is not unique and the size-dependence of the surface tension can distinct for different systems. The analysis is based on a relationship between the surface tension and disjoining pressure in nanodrops. It is shown that the van der Waals interactions do not affect the new-phase formation thermodynamics since the effect of the disjoining pressure and size-dependent component of the surface tension cancel each other.Comment: The paper is dedicated to the 80th anniversary of A.I. Rusano

Valentin Kachev: A Poetry (2017) [In Bulgarian]

In 2017 a new book of poetry was published by Valentin Kachev. The review of the book is given in the present article

The Library "Venets" [In Bulgarian]

The Library "Venets" is an electronic application to the Belogradchik Daily Illustrated Editio

The First Literary Evidence about the Belogradchik Uprising: Skene (1854) [In Bulgarian]

The first evidence in literature for the Belogradchik uprising in 1850 can be found in James Henry Skene's book "The Danubian Principalities, the Frontier Lands of the Christian and the Turk", published in London in 1854 (there exists an earlier edition (1953) with a slight change in the book title). Skene visited Belogradchik several days after the suppression of the revolt and his observations and impressions are described in the book. It is strange that Skene's book has never been cited in the literature about the Belogradchik uprising

Belogradchik: Old Town's Houses [In Bulgarian]

Save the old town houses – they are the key to understand the past and to feel the mystery of the old times. It is of importance for the contemporary generations. Understanding the life in the past is the right way to manage the community in our days. The examples in this paper are from the town of Belogradchik, Nord-West Bulgaria

Model for the Management of State Higher Education Institutions [In Bulgarian]

The Act of Higher Education was adopted in 1995. With it, Bulgaria became part of the European educational area, where higher education is structured in three cycles: (1) the basic one leading to the Bachelor's degree; (2) additional qualification and specialization leading to the Master's degree and (3) scientific training which ends with the educational and scientific degree "doctor". Over the years, this Act has shown defects mainly related to the inability of the state to exercise control over the activities of state higher education institutions, which is often not of public interest. That is why the adoption of a new Act on Higher Education is a pressing necessity. This article offers a new model of state university management

About Chemistry and Physical Chemists [In Bulgarian]

The narrative of Prof. B. V. Toshev, a former head of the Department of Phys-ical Chemistry at the University of Sofia, is on the history of the Bulgarian Physical Chemistry. It is a personal view on the research activity and social life in the Department of Physical Chemistry – a University unit established by the Professors Stranski, Kaischew and Scheludko

Scientific Activity in Higher Education: Personal and Institutional Assessment [In Bulgarian]

Education and research belong together - this expresses the very university idea. Research should provide the new scientific results. These should be published. The system of scholarly journals is organized in two levels. The first level includes the primary research journals and scholarly journals with more expanded audience. The second level includes the secondary research journals. A few Bulgarian journals are presented there. Citation analysis is of an importance mainly because it is heavily used in science policy and research evaluation professionals. The most popular indicators in such considerations are the impact factor (IF), the immediacy index (II) and the response time (t1). The meaning and application of these parameters are explained. The incorrect use of the impact factor in the Bulgarian evaluation practice is mentioned. The new indicators that would characterize quantitatively the scientific achievements of the researchers are proposed: efficiency e=nk, n and k - number of author's publications and thet citations, respectively, and personal impact factor PIF=q/m where q is the number of citations in a given year of m author's publications, published in two previous years. The problem of assessment of higher education institutions is considered in detail. The change of three indicators at least should be identified during the years. These are: S=Q/P (Q stands for the number of citations for a given year for the whole faculty N, which publishes in the year of question P publications), L/M and M/N, M,L - number of prospective/graduated students for a given school year

Illustrated History of Bulgarian Education

We decided each number of the journal to finish with a collection of chosen historical pictures, illustrated different aspects of the Bulgarian education in the past. The present collection is formed with the collaboration with Venets: The Belogradchik Journal for Local History, Cultural Heritage and Folk Studie

Distinguished People of Belogradchik: Zhelev, Mutafchiev, Karakashev, Ladozov, Stoychev, Savchev [In Bulgarian]

Short profiles of famous Belogradchik citizens, jokingly written, were published in the newspaper Vedernik, Belogradchik (1930-1931)