Browse

At present, biotesting methods are widely used to assess the toxicity of environmental objects. Priority environmental pollutants include heavy metals and phenolic compounds. The aim of this work is to compare the sensitivity of biotesting methods to determine the toxicity of waters containing heavy metals and phenolic compounds. To achieve this, biotesting methods based on the survival of Daphnia magna crustaceans, changes in the intensity of bioluminescence of the saccharifying bacteria (the "Ecolum" test system...

Climate reconstruction in the Holocene for the Russian Central Chernozemic region with use of palynological and soil research of deep cores in floodplain deposits and archaeological monuments are carried out. In the Preboreal period area was covered by meadow and grass steppes, pine and birch forests were locally spread. In the Boreal period they were dominated, broadleaved species were noted in small content at its beginning, in its middle span oak and hazel appeared, in the final phase ash and maple added. In th...

Complex of researches (chemical, mineralogical, X-ray phase, rare-earth, isotopic analyses) of volcanogenic-sedimentary rocks, composing basal horizon of the Osipayskaya formation of the Carnian stage in the middle course of Lena river ((Bulkur anticline) (Grakhanov, Smelov 2010, Proskurin et al, 2012), where diamonds of V and Vii variety according to L.Y. Orlov classification, was performed. Granite, ilmenite, spinellide, rutile are identified in rocks among minerals of heavy fraction. According to X-ray phase an...

In the case of the close location of various engineering structures to the place of drilling and blasting operations for ensuring the preservation of these structures there is a necessity of the accurate forecast of the level of possible seismic effects. The amplitude of seismic vibrations is influenced by many factors that are not considered in the regulatory method of determining seismically safe distances. Therefore, the only reliable approach to an accurate prediction is the direct instrumental measurements. T...

The purpose of the research is determination and comparison of the porosity values of the whole core obtained by nuclear magnetic resonance (NMR) and X-ray computed tomography (CT) methods. To achieve the purpose of the research, it was necessary to solve the following tasks: a) measurement of porosity of a whole core by NMR; b) obtaining core porosity values using X-ray CT; c) comparison of the obtained values, explanation of the differences in the porosity using these two methods; d) proposal of new approaches i...

This work is initially devoted to study the cracking behaviour of a small composite wind turbine blade. In order to choose material, the blade is manufactured by different materials (glass/epoxy, carbon/epoxy, Aluminium, and PVC). Considering loads and boundary condition, we study in static analysis the stress, strain and displacement, in dynamic analysis the modes shape and naturals frequencies, in fracture analysis the stress intensity factor, crack initiation and crack growth in order give the results by finite...

Due to the increased consumption of S420NL thick steel plates, the world steel price is expected to decrease. The main purpose of this investigation is to find an optimal solution both from a technical and commercial point of view to produce heavy plate 40 mm thick microalloyed S420NL hypoeutectoid steel. The imposed resistance class for this alloy is 420MPa with proven tenacity properties at temperatures up to-50 В°C. The experiment encompasses the necessity of defining a metallurgical route including chemical co...

The aim of the work was the creation of multicomponent protein composition with predetermined biological value and higher functional properties than the original plant based protein products. Initially, studies was made on the extraction of protein concentrate from defatted amaranth flour, for which were studied the fractional protein composition, solubility in various solvents, and the effect of cellulolytic and xylanase enzymes on the yield of proteins from amaranth flour . Were chosen the most effective solvent...

The aim of the work was the creation of multicomponent protein composition with predetermined biological value and higher functional properties than the original plant based protein products. Initially, studies was made on the extraction of protein concentrate from defatted amaranth flour, for which were studied the fractional protein composition, solubility in various solvents, and the effect of cellulolytic and xylanase enzymes on the yield of proteins from amaranth flour . Were chosen the most effective solvent...

The article describes the newly diagnosed incidence of the musculoskeletal system in the regions of the Republic of Kazakhstan (East Kazakhstan region) with the identification of risk levels, mapping, correlation of environmental factors and clinical and laboratory data on osteopenia diagnostics with the Omnisense-7000. A high incidence rate was detected in the Borodulikha district, close to the former Semipalatinsk nuclear test site and in the industrial city of Ridder, the center of the mining and metallurgical ...

The article deals with the problem of embedded computing systems testing and debug. The embedded systems design process, actual problems and existing solutions are analyzed from this perspective. The method of testing and debug based on model-oriented record and replay of the computational process is proposed, as well as the corresponding specification model for real-time computational processes. The specification model is a modified control flow graph. The key advantage of the proposed method is an abstract defin...

The aim of the present paper is to give a brief review of results of computer simulating observations of the lunar rotation from the lunar surface. The simulation of physical libration of the Moon using the lunar telescope was performed on the basis of multiparametric analysis. High expectations in terms of obtaining accurate data on physical libration of the Moon are linked with SELENE Japanese project. The project implies an installation of the optical telescope at one of the Poles of the Moon. The observation o...

Modern tendency for cities development in suburb areas for civil, commercial, and industrial use is one of the reasons for constructions in territories that are not fully suitable for this purpose. It leads to changes in the stressed-strained state (SSS) of soil bases which may result from the damage or destruction of buildings constructed on the territory, that is significant financial and material losses in future. In order to determine the stability and reliability of different structures the term of their oper...

Flow lines are one of the key elements of oil field facilities as they ensure safe transport of raw multiphase mixtures of gas, oil and water from reservoir to reception facilities. The growth of oil extraction in Russia makes the issue of developing new deposits and maintaining high production of oil and gas from existing ones particularly important. Therefore, maintenance of flow lines in service is of great significance. Most of Russia?s oil production originates in West Siberia . The territory is characterized...

The paper presents model-in-the loop simulation results of the roadheader cutting speed control system. The roadheader is equipped with an 132kW induction motor supplied from the frequency inverter. The output frequency is calculated by a PI speed controller on the basis of speed error (signal difference between a reference signal from the load controller and the measured signal from the incremental speed encoder). The whole control system model (involving an inverter model, sensor model, induction motor linearize...

The aim of the current research is to present an actual and overall picture of the arsenic (As) contamination of the soils in the Bulgarian part of the Danube floodplain between the Timok River and the Vit River including the following lowlands: Bregovo-Novoselska, Vidinska, Archaro-Orsoiska, Dolnotsibarska, Kozloduyska, Ostrovska and Chernopolska. One sampling campaign was carried in October 2017. The concentrations of As (mg/kg) were measured in <0.063 mm size fractions of 102 soil samples (56 samples from 0-20 ...

Small kettle holes filled with water are commonly found objects in damp lowland landscape. Their location within an agricultural and forest area may cause, irrespective of the land use, the enrichment in biogenic substances. Deficiency of data about the phosphorus and nitrogen content in the sediments of small water bodies, which makes the discussion of this subject more difficult and restricting it only to large water reservoirs. The chemistry of the surface layer of bottom sediments (organic matter, phosphorus, ...

A comprehensive, three-year (2013 ? 2015) geochemical analysis of soils has been conducted within impact areas of the main Russian and Norwegian coal mining centers in Svalbard. This study was focused on identifying both natural and technogenic trace elements and rare earth elements within a variety of landscapes with location of emission sources and natural factors of contaminants' distribution having been taken into account. The concentrations of macro, micro elements, Trace Elements (TM) and Rare Earth Elements...

The management system of technological processes at open pits is a system for planning and managing mining and transport operations and includes such types of planning as perspective, current and operational. The most difficult to implement and requiring the highest degree of accuracy, and also the most responsible is the shift operational planning. This stage is also characterized by the fact that it requires maximum interconnection and co-ordination of mining planning and management systems. Within the scope of ...

The article proposed the technology of monitoring the process control system the man-machine-environment. Machine Health Monitoring Center uses technology to identify trends that will help improve the service, support, and overall design of equipment. Technology specialists handle hundreds of alerts per day, either contacting the customer directly or passing the information on to a service manager or field dispatcher. Hardware-software automated monitoring enables structural studies and monitoring algorithms of te...

This paper deals with the evaluation of the hydrogeological hazard in the archaeological site of Castelseprio (northern Italy). Based on the geological, hydrogeological and geomorphological setting of the site, the failure modes and their causative factors were identified, and a proper conceptual model was reconstructed, identifying piping processes as the main phenomena ruling the slopes evolution and the landslides triggering. Afterwards, the hydrogeological hazard was assessed applying numerical modelling both ...

Effective territorial organization of Moscow and the rational use of its territory are impossible without taking into account the natural component of the city as well as the properties and potential of the landscape complexes that integrate all natural features in specific areas. The formation of the ecological framework of the city is particularly important. It should be a single system of interrelated and complementary components that make up a single environmental space: habitat-forming cores (junctions), ecol...

Sources of magnetic field are often approximated by dipoles or current loops, however it this work they are approximated by magnetized prisms instead, which is possible due to equivalency between magnetized objects and currents. Distribution of effective magnetization is then obtained by solving inverse magnetometry problem using the adaptive method of refining the unknown values based on discrepancy between initial values and model values. Z-components of Earth?s magnetic field in IGRF-2005 model in geocentric co...

The article describes the concept connected vehicle remote diagnostic system intended to increase the useful life of the vehicle and provide a simple interaction with the service center. In article the substantiation of mathematical model of communications in system of diagnostics of an electric equipment of cars in a kind, suitable for mathematical processing is resulted. It is offered to use model at which all making systems are represented in the form of structure of final automatic machines. By means of large-...

Establishing of pore fluids pressure is one of the critical challenges encountered in the formations opening in drilling. Pores fluids pressure evaluation through geophysical methods involves live recordings of the collector parameters using LWD (Logging While Drilling)/MWD (Measurements While Drilling) techniques. Empirical relationships of the dependence of pore pressure and the measured parameters use exponents whose values are accepted as constant. These exponents were determined on the basis of experimental d...

The forecast of a convective situation is achieved not only through the analysis of the synoptic situation as well as with the help of instability indicators. These are determined either by means of data obtained from aerologic surveys or by using numerical models. The data presented in the paper are obtained using the model ALADIN (Aire Limit?e Adaptation Dynamique D?veloppement InterNational) model. Run instability indicators were KI, TTI (Total Totals Index) and CTI (Cross Totals Index) CAPE and MOCON. The anal...

One of the most essential tools to protect nature, environment and biodiversity is to ensure the proper policy and environmental legislation in the creation of protected areas. Nowadays, green economy and environmentally friendly technologies play a major role for sustainable development. The purpose of this paper is to provide a detailed picture of the Romanian policy and environmental legislation regarding biodiversity and protected areas and to outline the importance of the institutional framework, global appro...

In Romania, the European technical standards concerning the quality control of the primary materials and asphalt mixtures used in road and highway works have been harmonized. In the same time, Romanian norms were adopted. These norms set limits within which every characteristic must range, without the possibility of adopting other values, even if laboratory tests prove, in many cases, that the imposed limits do not correspond to the practical reality. Also, most Romanian road laboratories own automatic Marshall eq...

The paper presents the theoretical analysis concerning the realization conditions of the capping layer in Romania, in comparison with the stipulations of other technical norms, especially the French ones. The authors aim at emphasizing the technical solutions which can be applied in different situations to obtain a high bearing capacity at the bottom of the pavement, with beneficial effects on the reduction of the road layer thickness and a better operational behavior. The comparative analysis will show that sever...

This paper analyzes the management of meteoric waters on the hearth of the localities taking into considerations the climatic changes. The proposed solutions follow the new European requirements for the promotion of the separative sewerage system concept. Also, localities that currently have a unitary sewerage system have to implement the European requirements for rainwater separation from domestic waters according to the available funds. Along with climate changes, the localities in Romania are facing high risk o...

This year marks the 21th anniversary of the completion of the tallest building in Romania, the 351.5 m smoke chimney in Baia Mare. The Surveying-Geodesy team of the North University of Baia Mare, at present a structure belonging to the Faculty of Civil Engineering of the Technical University of Cluj Napoca, monitored the verticality of the structure, immediately after completion, and then periodically, with a frequency of 1-2 years. This paper presents an analysis of the evolution of the vertical axis of the struc...

In the eastern area of Romania, a hill area and a plateau, there is a very large number of small dams. These were an average age of about 40 years and were made from local materials. In the period between their implementation and 1989, these accumulations were centrally managed by local governments. Generally, these accumulations were used for irrigation, fish farming, and in secondary, they had the role of mitigating the flood waves. The fact that the accumulations were exploited by the local administrations allo...

Geological storage of CO2 provides a way of reducing CO2 emissions into the atmosphere, by capturing CO2 from major industrial CO2 sources, transporting and injecting it into suitable deep brine aquifer rock formations. The selection of the potential site for the CO2 storage is based on the analyses of all the available geological and geophysical data (well data, seismic lines, gravimetric and magnetic maps, outcrops, geological cross sections, pressure and geothermal regimes, mechanical rock proprieties, chemical...

In case of using equipment in areas classified as with hazard of potentially explosive atmospheres, this shall be designed so as to avoid the ignition of the surrounding explosive atmosphere in which it is intended to operate. Equipment designed for use in potentially explosive atmospheres have to be assessed according the provisions of the ATEX Directive 2014/34/EU regarding the ensuring of explosion protection characteristics. In case of electrical equipment this assessment usually uses the provisions of some sp...

This article outlines the steps to be taken to ensure that the old Land Book Plans can work together with the current Land Plans and the Orthophoto Plans. For this purpose, scanning steps, georeferencing, must be performed. Then compare the old plans with the current ones by overlapping them over orthophoto maps. Following this stage, we can find out if there are differences between the older and the current plans or the current situation in the field. By overlapping, in the same reference system, we can very easi...

There is a continuing need to improve the quality of stochastic models for quantitative river flow modelling and forecasting. Since these time series are nonlinear in general, it is also possible to explore the fitting, forecasting and simulation performance of models, which account for the potential of heteroscedasticity in these series. Due to the nonlinearity of the runoff process such analysis needs to be conducted on a case-by-case basis. The goal of this case study is to test a methodology for stochastic mod...

Climate change is affecting forests both directly ? via increased frequency and/or severity of meteorological conditions, impacting tree growth and/or survival (e.g. wind storms, drought spells etc.) ? and indirectly ? via improved conditions for diseases and pests. Also interaction between the biotic and abiotic factors plays an important role. It is important to consider these circumstances in forest management policies to ensure that forest owners remain interested (financially motivated) in forest management. ...

For one motorway project in Romania, the alignment has to cross an artificial lake that was made for drying a former swamp. The alternatives considered were crossing the lake with a bridge or with an embankment. According to the geotechnical investigations, the soil in the area consisted of soft saturated clays of 10-18m followed by marle. Crossing the lake with a bridge involved raising the vertical alignment of the motorway to nine meters above ground level in order to ensure the clearance for the maintenance of...

Carrying out scientific experiments and field observations requires systematization, coordinated storage and possibility of online analytical processing of primary data to obtain consistent results and to discovery new knowledge. The article presents an approach to building a model-driven system based on the software platform of primary data collection and analysis. An approach to the constructing the control model of the data consolidation system based on the analysis of data description in the context of the sta...

Ionosphere is one of the most important sources of the errors in positioning of the Global Navigation Satellite System (GNSS), navigation and time. The standard methodology for estimating the state of the ionosphere (total electron content - TEC) that uses terrestrial or space receivers, which can effectively process the signals from the GNSS-satellites using the synchronous observations by the carrier phase and group delay, does not depend on pseudo-distances, a priori values or other external information. The on...

The article deals with geodetic works connected with the construction of the space position of the track together with the measurement of the 3D axis of the track on the section 2363 (the state border between the Slovak Republic and the Czech Republic and the railway station Horn? Lide?, which is located in the territory of the Czech Republic). In the introduction, the purpose of measurement and site description are briefly described. In the core of the article, there is a way of creating SPT (spatial position of ...

Constructive details of welded steel industrial structures involve critical areas in the structure. A welded steel structure behaves differently toward a steel structure made of laminated steel profiles in a pervasive corrosive environment. Details of the joining of the steel elements must correspond primarily to the strength of the welded steel structure but also to the impact of the corrosive environment, that is to say, some details must be chosen to fade the effect of the corrosive environment. The paper will ...

Assessment of selected (trace) elements and nitrate along the 26.7 km long Radonja River (Croatia) was examined with the purpose of testing the ability for small rivers to serve as a model for identification of sources and dispersion of common environmental contaminants. The Radonja River rises and flows through specific geological region of the Petrova Gora Mt. (507 m a.s.l.). It is located in the middle part of Croatia, with the Vojni? town (~5,000 inhabit.) as the largest settlement along the whole river course...

The article presents problems associated with attempts at introducing renewable materials into general use in architecture, with a particular focus on timber. The full implementation of this process will make it possible to significantly lower waste production as a result of the functioning of the contemporary economy. The results of these actions involving the use of new sustainable solution systems in terms of the manner of designing cities and buildings include the use of existing material resources to the maxi...

Belt conveying belongs to high-performance, economically and energy efficient continuous system. Optimization of this conveying systems makes possible reducing the total operating costs up to 30%. For this reason is necessary to choice of the suitable structural elements. Conveyor belt is the most important element of this system and quality of its strength properties is a needful prerequisite for a smooth operation of belt conveyors. Insufficient quality of strength properties has a negative effect on the reliabi...

The reliable determination of solid material thermal properties (thermal conductivity, thermal diffusivity and heat capacity) are significant for various industries. Knowledge of thermophysical characteristics of reservoir rocks is essential in developing high viscous oil deposits by thermal methods. One of the biggest problems in experimental investigation of thermophysical properties concerns with measurement errors due to multidimensional character of thermal flow (generally, in most cases, one-dimensional theo...

Agricultural production is expected to increase in the world, which will be determined by the growing population and the rising demand for food, feed, fibre and energy. However, an increase in agricultural output could result in an increase in greenhouse gas (GHG) emissions from the agricultural sector. In order to avoid it, emissions have to be ?decoupled? from agricultural production, i.e. it is necessary to decrease the GHG emissions per unit of agricultural production. This is particularly important for Latvia...

The research study analyzes the state of degradation of Kula Izvoranu - Geblescu - heritage building from Oltenia Region and proposes solutions for its rehabilitation and introduction into the cultural circuit. The influence of the known parameters - construction period, used materials, is analyzed. The building being in precollapse stage is mandatory to be rehabilitated. The methods used are non-invasive and are based on visual inspection, historical analysis of buildings. There were performing a lot of compressi...

Coatings based on microspheres are internationally recognized for their heat insulation characteristics, due to the specific properties of their nanoparticles ? ceramic, glass, silicon microspheres - even when the layer thickness has only 1-2 millimetres. Taking into account the high price of such products, the research studied, through specific experimental laboratory works, the possibility of obtaining a new and cheaper heat insulating product, by introducing kaolin as a filler. The experimental results showed n...

Paper presents a new process of refurbishing by metal deposition in different zones of the used parts, the refurbishment by welding in the ultrasonic field. A comparative analysis of the main defects is made, that occur in the case of welding in the protective gas comparing with the process of refolding by welding in protective gas medium with the ultrasonic activation of the additive material. In the case of the refurbishment by ultrasonic welding of used parts, the problem that concerns most is the appearance an...