Browse

In this paper, we present the spatial distribution of sedimentological and geochemical characteristics of the bottom sediments of Vouliagmeni lake which is located in the SW Perachora peninsula extending into the eastern Gulf of Corinth, Greece. A total of nineteen (19) samples consisting of upper 1-2cm lake bottom sediments were collected and analyzed. Standard sedimentological analyses were carried out including grain size analysis and the measurement of calcium carbonate content (CaCO3), total organic carbon (T...

The American NASA Apollo missions to the lunar surface, between 1969 and 1972 greatly increased the knowledge of the Moon as well as that of our own Earth's age and origins. Part of the scientific research used geophysical techniques to help define the structure of the Moon, both deep and also regarding the near surface. One such experimentation that was carried out, on both Apollo 14 and Apollo 16, as part of the Apollo Lunar Seismic Experiment Package (ALSEP), was the Active Seismic Experiment (ASE). The ASE com...

The study is based on seismicity data analysis, using seismological data available from published local, regional and global earthquakes catalogues. Seismicity data for Romania, Bulgaria and the Western Black Sea have been compiled into a unique data-base and represented within a georeferenced framework. A large number of seismicity maps at various depths and depth intervals, as well as W-E, N-S and NE-SW in-depth seismicity graphs have been built. The regional structure of interest is the Intramoesian Fault (IMF)...

The Apuseni Mountains are located in the western part of Romania and are limited to the west by the contact with Pannonian Depression and to the east by the Transylvanian Basin. Basically To the south Apuseni Mountains are bounded by the South Transylvanian Fault and in the northern part by the North Transylvanian Fault. Apuseni Mountains represents an isolated massif inside Carpathian arch, consisting of complex folds and thrust belts formed in Cretaceous period as results of interactions between multiples microp...

The Black Sea is the largest marine anoxic basin in the world, connected with the Mediterranean through the Bosporus Strait, Marmara Sea and Dardanelles Strait. During global ocean low-stands, the Black Sea basin was isolated from the Mediterranean evolving as a fresh-brackish giant water body. In the Late Pliocene ? Pleistocene times, the Black Sea experienced periodic influxes of water from the Caspian Sea through the Manych Corridor. These hydrological changes that occurred in the Black Sea basin had greatly in...

This work is related to the analysis of two complicated pipeline sections (section «A» and section «B»). Rheological properties (hydrometer MARS?II Haake) of produced and transported fluids. Hydraulic calculation of the technological process of fluid transportation from the well sites to the oil collection system was performed. Hydraulic modeling carried out with the help of PIPESIM software. The input data for process modeling were the results of investigations of rheological properties of transported fluids and ...

The article describes an effective simulated model of international timber transportation, which is a part of support methodology for the selection of a transportation scheme of international timber transportation. The main objective of the developed model is to increase the economic efficiency of international timber transportation. Using the simulation method is due to its availability and cost-effectiveness. The initial data used in the model are experimental data (time spent on the moving from the loading poin...

The topicality of this study: The corporate social responsibility (CSR) became a particularly topical issue in the field of entrepreneurship since Latvia has joined the European Union in 2004, as well as for Bulgaria as the country joining the EU. All business companies are asked to undertake the strategy of social responsibility and to adopt the principles of social responsibility. In the context of this study, a sustainability strategy is adjusted to the specific economic, social, environmental and cultural fact...

Traditionally, the rural areas are characterized by a lower level of social sphere development, a limited range of services offered, difficult access to part of the population, etc. The demographic resources of these territories have specific features and require target development policies that will limit the depopulation of the rural areas. The social entrepreneurship is seen as a mechanism for solving social problems in rural areas and social enterprises are seen as a way to promote the active integration of vu...

The dolomite problem is very popular among geologists, who are especially working with oil-saturated carbonate rocks. Probably, this is the most common type of diagenetic transformation of limestone. However, the problem of secondary dolomitization is still insufficiently discussed, as a process associated with oil migration and oil-charge. The main purpose of this study is the geological reconstruction of diagenetic changes for the Tournaisian and Visean dolomites based on the application of data from cathodolumi...

It is known that clastic material originated as a result of the transformation and translocation of rocks and minerals is the major constituent element of soil. Its genesis and petro-chemical composition essentially determines the formation of the soil of some or other taxon. The field and laboratory studies accomplished by us showed that soil-forming rocks in Interior Mountainous Ajara are andesite and andesite-basalt elluviums with intense magmatic instructive fracturing with various mechanisms and directions of...

The article deals with the problem of ownership of lands necessary for the operation of SHP by different entities. Several variants of solutions leading to the settlement of ownership relations to immovable property were elaborated. To ensure access, it was necessary to propose a range of service. The non-standard assessment also included solving problems related to the valuation of a flat in a small hydroelectric power plant, pricing and runoff and other engineering structures related to the hydroelectric power p...

In the environment are present heavy metals such as Cu2+ and Pb2+. Metal-processing industries, mineral processing, the manufacturers of inorganic products and large scale coal users, such as public utilities are the major sources of heavy metal pollution. These heavy metals are toxic, are non-biodegradable, and they pose potentially lethal risks at high levels. Chemosorption is emerging as a potential alternative to the existing conventional technologies for the removal and/or recovery of heavy metal ions from aq...

In Latvia, land is the key natural resource, and the use of it for production purposes is of great importance. The utilised agricultural area in Latvia totalled 1.93 mln.ha, of which 47% or 905 thou.ha was grassland. Meadows and pastures had a 70% proportion, while permanent grasses had a 30% proportion in the cropping pattern for grassland. Therefore, the overall aim of the present research is to identify the grassland area and the geographic locations of and the cropping pattern for grasslands in Latvia. To achi...

Soils are the foundation of food production and food security. Many agricultural practices can potentially mitigate greenhouse gas emissions (GHG). Managed organic soils are the largest sources of GHG emissions from agriculture. In Latvia, organic soils have been little researched to date. Therefore, the overall aim of the present research is to identify the geographical locations, quality and uses of organic soils in Latvia. To achieve the aim, the following specific research tasks are defined: 1) to analyse the ...

Competition in air transport is growing and is a significant factor influencing airlines in the development of the strategy. In this article, we analyse the Bucharest-Tel-Aviv line which is operated by three airlines Tarom, EL AL and Blue Air, which are not allied and have no bilateral agreements. These companies are therefore direct competitors, and in our analysis, we are more closely examining their pricing policy over the reference period. By analysing the data we compared the possibilities of the aforemention...

The results of the field studies of heavy metals in snow cover presented in this work for urbanized territory of Almaty agglomeration first time. Seventy-five samples were collected during the period from February 5 to March 10, 2018 at 25 permanent monitoring sites. Samples of snow were analyzed for heavy metals (Cu, Zn, Pb, Cd) using ??S-7000 (Shimadzu). The obtained quantitative data were used to assess the nature of the spatial distribution of metals in the snow cover of the study area and based on them were p...

High qualitative and quantitative requirements for dimension stone on the building materials market make producers update the methods used currently to assess natural fracturing in areas of interest at various levels when prospecting potential zones. As most well-exposed areas are already being quarried, new areas are most efficiently prospected using statistical and mining-geometric methods and the data obtained are analyzed. Locating dimension stone prospects is a multi-stage process. Analysis of large areas per...

This paper describes the results of the project which uses information from core lab studies in reservoir simulation in order to improve the quality of the forecasting ability. Samples of core were selected for each of the rock type in order to study wettability. Studies on the determination of the contact angle of wetting were carried out by the device, which allows determining the surface tension and contact angle in the formation conditions. The obtained values were applied for each of the five rock types for f...

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...

The term smart growth is defined as developing an economy based on knowledge and innovations (EC, 2010). According to Eurostat (Eurostat regional yearbook 2014, Eurostat yearbook 2018, etc.), an expansion of the knowledge-based economy segment is observed in the European Union, which leads to a structural redeployment of the economy. Accordingly, growth in the knowledge-based economy segment becomes an important research problem in each EU Member State. The authors analysed this process in three Baltic States, pla...

Were described a quartz-veins zones which localized within metamorphosed rock of South Muya block Northeast part of Western Transbaikalia. During the research was received structural and material characteristics quartz veins different orientation of the creeks an Otvesny, a Krivoy and a Bambukoy river. Based of kinematic analysis, crack paragenesis highlighted and genetic nature is determined structural deformations. Thus was found out that paragenesis of quartz veins which has been studied was educated as a resul...

The oil fields of the Vereysky horizon (C2vr) are regional oil saturated on the Tatarstan Republic and located in the oil-and-gas-bearing Serpukhovsky-Vereysky basinal complex. In the sections are interbedding of various facial types of limestone with marls, clays, and sandstones. From below upwards along the section, the proportion of the clastic component increases and the carbonate component decreases. In the anticline structure, Vireysky oil-saturated reservoirs form multilayers series. Oil reservoirs are conf...

A characteristic feature of fuel cells is a weak dependence of their energy efficiency on the scale of the installation and the ability to provide the required level of power by simply increasing the number of fuel cells. The use of fuel cells, including in combination with renewable energy sources, can mean a technological revolution in the transport sector and energy, will reduce the negative impact on the environment to a minimum level. In this paper, a review of the current state of problems and trends in the ...

The long-term response of aquatic vegetation of shallow freshwater ecosystems to the anthropogenic impacts (water level changes, pollution by heavy metals) was studied in 1999-2018 at two water bodies of Leningrad region, Russia: the Rakovye lakes and Neva bay of the Gulf of Finland, the Baltic Sea. The researches included the analysis of satellite images from 1970 to 2018, and the study of the characteristics of the aquatic plants of different ecological groups (halophytes, floating and submerged plants) -the spa...

In this work, novel sorption material based on cellulose and polyvinyl alcohol cross-linked by calcium ions is obtained. In order to increase the oil capacity of the sorbent, the mineral glauconite, which has a natural sorption capacity concerning oil, was introduced into the cross-linked polymer matrix. The structure of the obtained polymer sorbent was studied: the method of infrared spectroscopy was used to study the effect of calcium chloride on the cross-linking of polymer components, optical microscopy was us...

This paper examines the level of vibrations transmitted to the crew on a river ship. This ship made a test cruise on the Danube, between Braila and Galati, round-trip (32Km). This cruise was done before the ship was repaired, to compare the levels of vibrations before and after the repairs and to check their efficiency. There were determined both the vibrations produced by the ship's equipment (engine, generator) and those to which crew members are subjected in the areas where they spend most of their time. To det...

This paper presents a study on deployment of policy based quality of service management at the mobile network edge. The requirements of fifth generation (5G) services for high bandwidth, low latency, reliability and availability can be fulfilled by Multi-access Edge Computing (MEC) former Mobile Edge Computing, which distributes cloud capabilities in the Radio Access Network. The paper studies the MEC potential for monitoring of accumulated usage of network resources based on data traffic volume on per session or ...

Construction and subsequent operation of port complexes leads to increased anthropogenic load on coastal and marine areas. An effective compensatory measure for load reduction is the organization in the neighboring parts of the shores of protected nature areas. We present the study results of the impact of nature protected areas to stabilize the ecological situation in the anthropogenic transformed coastal zone on the example for the port of Bronka, commissioned in 2015. The objects of study are the territory of t...

It is known that the solar-moon tides (SMT) influence often serves as a trigger releasing seismic energy in a prepared area of the earth's crust. The regular increase in the number of earthquakes during the syzygy and perigee was empirically determined at the end of the 19th century by A. Perret [1]. The tidal force reaches its highest value when the perigee coincides with syzygy, which occurs once a year. The such pattern is observed for rock bursts (RB) also. However, it should be noted that the most tide influe...

Between 1990 and 2015, the annual global amount of CO 2 emission generated by transport has increased by 68%, from around 4.6 GtCOGtCO2 to aroaround 7.7 GtCOGtCO2. Technological advances towards eco -friendly vehicles and policy incentives promoting environmentalenvironmental-friendly modes of transport have thus been offset by economic growth and increasing mobility. This study questions the relationship between ec onomic growth and sustainability performance of transport sector. It adds to the literature new ins...

The Niedzwiedzia Cave is one of the longest and deepest caves in Poland. The object is protected by the Nature 2000 Program, its natural value was the reason for creating there the area of Nature Reserve as well. Part of the cave has been available for tourists from 1983. In 2010 the entrance into the new route of the Cave was discovered, the length of which was over 1000 m. In the new discovered cave spaces many different, unique dripstones: stalagmites, stalactites, cascades, draperies and domes are present. Bec...

The influence of material resource flows in geosystems on formation of consumer value and the cost of high-tech products has been studied. For example, the flow of energy resources obtained indicators of impact of reducing their cost on the prices of high-tech goods. The occurrence of a cumulative effect in high-tech industries with multistage processing of resources is shown. Cumulation of reduced costs is formed. As a result, synergy of economic efficiency arises in geosystems. A mathematical model of the synerg...

Biochar samples were obtained by hydro-pyrolysis (600-800oC) of spent algae material, remaining after extraction of the liquid substances from algae for biodiesel production. The pore structure of the obtained carbon was studied by nitrogen adsorption at -196oC. The most prospective algae biochar sample obtained is distinguished by moderate surface area of 490 m2/g, as well as considerable microporosity (0.15 cm3/g) and mesoporosity (0.13 cm3/g). Pore size distribution show that the pores with size 1-3 nm prevail....

In this paper, we present an area, from the NV of the Transylvanian Basin, which has a particular geological structure. The complex geological aspects begin to be clarified once the Geological Maps 1: 50,000 were made. There is a marginal area in the North-East part, which is a monocline which sinks to the South and South-East. This marginal area is delimited by the sloping area through an important fracture, in the direction of Valley Calda - Gadalin - Gherla. Southwest of this fracture is the area with salt. The...

The modern world faces serious challenges related to environmental protection, such as climate change, depletion of natural resources or loss of biodiversity. New economic and social models, as well as technologies are needed to bring significant benefits to the environment. Entrepreneurs also face the challenge of introducing changes and carrying out restructuring processes to effectively implement eco-innovations. One of the tools to determine the company's development potential in the area of eco-innovation is ...

In recent decades the crisis of obtaining natural organic raw materials attracts the attention of researchers to the use of renewable plant resources, to their deep processing in order to obtain the maximum yield of useful products. One of the most promising types of organic raw materials is spruce wood. Special attention of researchers to spruce wood is determined by its large reserves in Russia, the characteristics of its physicochemical properties and the composition of components. In this regard, studies have ...

3D plastic is a modern three-dimensional printing material that is very popular among home and professional 3D printers using layer-by-layer fusing technology (FDM). Today, in professional three-dimensional modeling, two main types of plastic thread are used - synthetic ABS and biodegradable PLA, which are converted into finished products in industrial FDM printers. Products from 3D printer are usually single-action models, which must be disposed of after use. However, synthetic polymers are not able to decompose ...

The purpose of this paper is to investigate the environmental effects of the telecommunications usage, residential and business, by assessment of the changes in the energy consumption in Bulgaria during the period 1994-2018. Bulgaria is one of the EU countries with the largest decline in energy consumption during the last decades. Many factors influence the amount and efficiency of energy consumption. The present research is based on the assumption that telecommunications cause energy consumption. The change and t...

Loop heat pipe is ingenious cooling device to remove waste heat from power electronic elements used in the specific applications e. g. where does not require forced cooling and where is not space for placement a big air cooler. Loop heat pipe transfer heat through the phase change of the working medium circulating in closed loop of the loop heat pipe. Ingenious of this device is in the heat transport without using any moving elements and gravity field. This work deal with experimental evaluation of cooling efficie...

Phosphorus is the most important biogenous element that is fundamentally necessary for biological reproduction in all its forms. The occurrence of phosphorus, in the Earth?s crust like carbon, is an example of geochemical relations. Approximately 170 known phosphor minerals in nature. The basic supplies of phosphorus in the earth crust concentrates in apatite that bonds about 95% of the total quantity of phosphorus in the lithosphere. Phosphates - of world production (80%) comes from sedimentary deposits. We have ...

The agri-environmental policy of the CAP is not new to the EU. It has been developing for over twenty-five years, as agriculture is the sector directly dependent on abiotic and biotic environmental factors. On the eve of the new programming period (2021-2027), challenges in relation to the environment, climate and sustainable agriculture are increasing. In the context of deepening environmental changes, the risks to agriculture are limited to: changes in agricultural land; reduction of agricultural productivity; r...

The research of some features of the population distribution in the North of Russia has been presented in the paper. The aim of the research is to reveal systemic and prospective problems of population density estimating in Russia?s northern regions. The objects of the research were the subjects of the Russian Federation, fully or partially located in the Zone of the North. The population density in the North of Russia has been analyzed in the paper. The information concerning the area of the Russian Federation?s ...

Operations conducted by petroleum industry generate a whole range of drilling waste materials. In oil & gas industry, the most common wastes consist of used oil or water-based drilling fluids, bore dusts, and cuttings. The chemical composition of drilling waste and its toxicity depend primarily on the geological and technological conditions of drilling, the type of drilled rock deposits, type and composition of the spent drilling mud and also on solids control equipment. Sustainable waste management became one of ...

In modern conditions of waste disposal is extremely relevant. Issues arising from the disposal of waste material, even in small quantities, are relevant to most countries of the world. In mining, they entail the solution of a whole complex of problems associated with the disposal of waste mining enterprises, rational use of underground waste space, preventing negative effects on the environment (natural and urban). The use of underground waste space makes it possible to utilize the waste of mining enterprises, to ...

The authors studied the change in the content of dissolved total iron, pH, Eh and mineralization of water bodies of the Azov sea catchment were constructed according to the megaprofile "Mine waters of the coal mining area, sedimentation and aerators ponds, small rivers (Eastern Donbass) ? Don River - Taganrog Bay - Azov Sea". The content of total dissolved iron decreased when moving from the area of mine waters to the Azov Sea, and the values of the hydrogen index, in the same direction, increased. For mineralizat...

Here we report immobilization of GOx on magnetic silica: (i) nanoparticles Fe3O4 with silica coating (Fe3O4-SiO2) and (ii) mesoporous silica with incorporated nanoparticles Fe3O4 (SiO2-Fe3O4) functionalized with amino groups using glutaraldehyde as a linker. Magnetic support based biocatalysts demonstrate high catalytic activity in D-glucose oxidation to D-gluconic acid at pH 5-7.5 and temperature of 30-50?C with the best activities of 95% and 94% for SiO2-Fe3O4-GOx and Fe3O4-SiO2-GOx, respectively. A comparison o...

The energy system is an area which requires a large enough attention in the process of automation and the use of all the possibilities of producer of energy from renewable sources. It is not enough to produce energy but also to collect and trade to the true value, without being used intermediate bodies for recouping. Drop is a technology that allows users to collect data, information from one or more establishments located remotely and send instructions with limited control by them. The article presents a study wh...

The world today is characterized by globalization, the development of information technologies and diversity of values, so people's activities in a wide variety of fields are expanding, but the boundaries between them are becoming more and more uncertain. Different fields are converging. Today, knowledge transfer is not possible an individual must be able to apply knowledge, use skills and show attitudes in complex ways to solve problems in real life situations. The current competence is the ability to adequately ...

Plant biodiversity is important in economic terms in Romania, as well as for the ecosystem aspect maintaining and giving spiritual value and comfort. As a result, the article aims to focus attention on the appreciation of plant species in the center of an inexhaustible source of renewable energy. Agricultural holdings in Romania mainly cultivate cereals, some with records in production (for example maize production in 2018). Cereals are well known for their food potential and animal feed. At the same time, after h...