Browse

Snow cover is an indicator of the fluctuating climate, resulting from the change in the regime of winter precipitations and air temperatures. Our previous studies have revealed significant decreasing of the seasonal snow cover maxima and the precipitation amounts in the highest mountainous regions of Bulgaria, which is however not so strong at lower altitudes. Current research summarizes our last findings about one other characteristic of the snow cover - its duration. This is presented as annual number of days wi...

Drought is a complex weather and climate-related phenomenon with significant ecological and socioeconomic consequences. In light of the increasing severity and frequency of droughts in Europe in recent years, this study focuses on assessing the spatiotemporal evolution of drought in Bulgaria during the period 2014-2022. To achieve this, the Standardized Precipitation Index (SPI) is calculated at different time scales (1, 3, and 6 months) for both the country's territory and individual municipalities using software...

In this paper, we propose a mathematical model and an appropriate algorithm that allows one-time measurement of the frequency response and phase response of the MET sensor under normal conditions to construct a complex transfer function of the MET at any other temperatures from the allowable range of -35 + 55 °C with the experimental accuracy not worse than a few percent. This model and the algorithm for setting up and selecting thermocompression circuits of electronic amplification and filtration circuits introdu...

The work is devoted to the synthesis of epoxy derivatives based on hexachlorocyclotriphosphazene. The aim of this study is to synthesize a new epoxyphosphazene binder with reduced functionality, due to which the mass fraction of phosphorus in the synthesized compound increases, as well as its viscosity decreases, which makes it possible to fine-tune the density of the network formed during the curing of the binder. To achieve this aim, the tasks of choosing of mono- and difunctional substituents of chlorine atoms ...

In the mountain zone, the slope exposure plays important role in the process of soil formation. The aim of the work was to assess the impact of slope exposure on the soil properties of agricultural terraces in the Eastern Caucasus. A study of soil properties of agricultural terraces in the mountainous zone of the Eastern Caucasus (Dagestan, Russian Federation) was carried out. The purpose of the study was to compare the soils of agricultural terraces on the slopes of the northern and southern exposure. The content...

This paper presents the results of the sea water heavy metals (Hg, Pb, Cd, As, Zn, Fe, Ni, Cu) content examination in the coastal area of the Sevastopol. The water pollution index was calculated using 4 parameters with the obligatory inclusion of dissolved oxygen. Determination of metal content in water samples was performed by the method of inductively coupled plasma mass spectrometer PlasmaQuant MS Elite (Analytik Jena, Germany). The determination of the concentration of each of the chemical elements in seawater...

The ability of a moving charge to create a vortex magnetic field around itself is well known. This phenomenon formed the basis for the creation of electromagnets. The reverse process is electromagnetic induction, when a magnet moving with acceleration becomes a source of electric current in a closed conducting circuit. In this regard, ferromagnetic fluids are of some interest. Ferromagnetic fluid is an aggregatively stable colloidal system consisting of nanosized particles of a dispersed phase uniformly distribute...

The paper discusses the conceptual issues of creating and using the information infrastructure of a multi-satellite system for Earth remote sensing (MS RS) to address a wide range of problems in the oil and gas industry. We analyzed the information needs arising from monitoring the state of oil and gas production, storage, transportation, and refining facilities, as well as the possibilities of meeting these needs in the framework of a promising MS RS created on the basis of a small spacecraft constellation. The c...

During an earthquake, a strong ground motion arises not only in the focus, but it also extends over long distances. Strong motion data have to be used in the Earthquake Early Warning (EEW) for a quick response of rescue services and monitoring of building structures. As the speed of the waves propagation in the ground is sufficiently high (about a few km/s), the warning time must be little, but sufficient to alert the people. Structural and earthquake engineers can use strong motion data to verify or improve desig...

Further development of digital economy requires researching the limits of some algorithms applicability. These algorithms are based on the mechanisms obtained as a result of investigating the processes of ?alive? nature. Such algorithms were called the bio-inspired algorithms and are widely used in practice, for example, for solving the problems of multi-agent systems coordinated control. Application of coordinate descent, a type of gradient method ? extends the description of the existing shepherd dog algorithm. ...

This work is devoted to obtaining and characterization of wood-mineral composites based on wood debarking waste and basalt screenings, which have improved ecological,strength, sound and heat insulation properties. To achieve this goal, the following tasks were solved: the regularities of the process of spontaneous filling of the porous space of the wood matrix with mineral fine particles due to the capillary forces of plant raw materials were established; simulation models of the structure and functional propertie...

The existence of old unused buildings, called brownfields is one of the major urban problems today. In addition to the well-known environmental or social problems, the existence of brownfields is linked to economic problems, including, among other things, the decline in the prices of surrounding, especially residential, properties because of a reduction in social status and the prestige of the site. This article attempts to quantify this problem in a framework. On the example of several locations in the Moravian-S...

The so-called Karolina area is situated very close to the center of Ostrava - the third largest city in the Czech Republic. It is an area of several hectares on the main entrance to the city center. Urbanistically, it is one of the most attractive areas of the city. Due to the industrial past of Ostrava, this area has long been used as a coking plant in the past. Upon completion, the objects became a full-fledged brownfield with all the negatives associated with this phenomenon, including the environmental burden....

The aim of this study is certainly not to include and introduce various types of civic amenity buildings in terms of functionality and hierarchy, nor to investigate in detail particular types of civic amenity buildings. The aim of this study is rather to focus on the current trends in building types within the new public facilities, which are based on current problems, namely the lack of services and facilities which are being either supplemented with new ones or are completely replacing the existing, nowadays unu...

Hlucin town, together with its surrounding area, is a typically historically- rich example of the region, which undoubtedly has influenced the historical development of its entire area - an area characterized by its frequent changes and various political, ethnic, economic, social, cultural and spiritual impact. Some historic moments are therefore reflected even in the present day, whether the actual location, structure of the city centre, the emergence of a fortification and its current state, changes in the ethni...

There are summarized findings from research-and-development (R&D) study of environmental communication (EC) development in Liepaja town municipality, based on case studies research methodics following applications during 2006пїЅ2015, and, summarizing, all stakeholders semi-structured interviews conducted in 2016. Liepaja is one of the most active pro-environmentally oriented municipalities in Latvia, where the complete collaboration communication model approach of all four EC complementary instruments has been int...

DelPat program makes possible to design of blasting operations and cost estimation with ground vibration analysis arising from blasting. In this study, these applications of DelPat program were used for blasting works in excavation of Boyabat Dam and H.P.P. (Hydroelectric Power Plant) construction and the results were researched extensively. Blasting design was done and the results of planned blasting works and ground vibration measurements were analyzed by use of DelPat. At the end of some shots, 35 events were r...

Today Environmental management is an essential element of successful firm management. In this paper is an environmental management concept in “Mini Mariza Iztok”EAD presented. The benefits of the environmental management system include an increased focus on the most imminent ecological risks, improving team participation and prevention.