Browse

The purpose of this research was to evaluate the viability of investment into a waste water treatment plant using electrochemical clean-up technique which could replace the existing waste water treatment plant operating on reverse osmosis principle. The evaluation was performed from the technological and economical point of view. First, a pilot waste water treatment plant was built within the existing facility and operation parameters were optimized. Next, the efficiency of waste water purification was assessed ba...

One of the important factors affecting nutrient uptake by the root system of the plants includes soil reaction. Increased soil acidity may adversely affect the use of biogenic nutrients, such as phosphorus, potassium, calcium, magnesium, sulphur and molybdenum. In soil, nutrients are immobilized to insoluble forms. Although their amount in soil may be sufficient, the plants cannot obtain the optimal quantities, causing a decrease in the yield or production quality. On the other hand, in the metabolism of plants, a...

Novel trends in the market of fermented dairy products are leading to obtain various products with high functional and nutritive but less energy value. The development of new fermented dairy products could be divided into two groups in order to: 1. obtain products with improved physicochemical characteristics, rheology, texture, microstructure and sensory properties; 2. obtain products with pronounced nutritive characteristics and functionality. Yogurt is a very popular dairy product in most countries, it is consi...

Up to 50% of arable land is threatened by water erosion in the Czech Republic. Annually, water erosion causes billions of dollars of damage. It is especially reflected in the reduction in value of agricultural land and yield of the erosion damaged soil. In erosion affected areas, the soil is washed off and depleted of the finest particles binding nutrients and contributing to the formation of humus. In our study, we include five effects of water erosion on the content and quality of humus in chernozem, in topsoil,...

Temperature is a primary factor affecting the rate of plant development. Extreme temperature events have become more intense, more frequent, and longer in recent years. Extremely high and low temperatures may have a detrimental impact on the productivity of trees in critical phases of their development. The work presents the results of phenological observations of two broadleaved tree species: European hazel (Corylus avellana L.) and sessile oak (Quercus petraea Matt.) with the main emphasis on the impact of the t...

The process of Underground Coal Gasification involves risks of uncontrolled/unpredictable course of the gasification process. To minimize the risks of contaminants leaking outside the georeactor zone in the event of emergency is of a significant importance when aiming to maintain safe course of the process. The article presents methods and measures aimed at reducing the risk. These methods are based on reduction of the impact of released gaseous contaminants generated during the process. In order to achieve it, a ...

The reactive oxygen species are usually generated by normal cellular activities of the aerobic metabolism and play the role of a signal molecule and beneficial growth regulator. When plants are exposed to stress conditions the concentration of reactive oxygen species increases. Therefore, to neutralize these free radicals and to protect cells from oxidative damage enzymatic and non-enzymatic antioxidant systems are activated. In this paper it was investigated the effect of drought on the activities of antioxidant ...

Dust is one of the major hazards that affect workers in the mining industry. Currently, there are many technologies that help reduce the dust load on the miners. But looking at the statistics of professional and profession-related diseases, it can be seen that the incidence of diseases caused by various industrial aerosols is not reduced. This indicates that the existing methods are not sufficiently effective. It is not excluded that the very method of estimating the dust load on workers is not correct and needs t...

In the present scientific work assessed current status of question about grinding stage effect to electrochemistry parameters of operation preparation slurry before intermediate selective flotation. Showed needs of more detail study chemical reactions in the slurry preparation and flotation processes.At example of Abiz deposit ores has been offer new methodology. The ores are polymetallic sulphide type and the one are most difficult for mineral processing. The methodology allows increase information base during fl...

This article is about a new data acquisition system and procedure used for electromagnetic pollution assessment and warning, with mobile equipment, placed inside some electric high voltage power stations in the Central Region of Romania, as well as the software involved and interpretation of results. The whole system and procedures, as well as all the measurements were performed by our team from the Politehnica University in Timisoara. The acquisition system and the software involved are developed by our team. Mai...

Ensuring the stability of liquid rate represents a major requirement imposed for sprinkling machinery. This important objective can be materialized only by equipping sprayers with advanced automatic adjustment systems, in order to correlate the two work parameters: displacement velocity and liquid flow. An effective correlation of these parameters can be achieved using adjustment systems of the electronic type. A such adjustment system can not operate efficiently without an adequate comparator circuit. It is also ...

Natural compounds and products are increasingly demanded by the pharmaceutical and cosmetics industries as safer and user friendly alternatives to synthetic variants. Young wheat plantlets, known as wheatgrass, are a valuable source of minerals, vitamins and chlorophyll pigments and the biosynthesis of such compounds may be influenced by the cultivation conditions. The present study focuses onto the chemical profile, mineral and chlorophyll content of cultivated wheatgrass using two different types of water (sprin...

Considered here is the problem of cooling water-cooled reactors in an emergency, including in emergencies involving a blackout. This problem has become particularly important after the events that occurred at the Japanese nuclear power plant, пїЅFukushima-1.пїЅ Here we present a new emergency reactor-cooling system developed at the Department of Energy Problems at the Saratov Scientific Center, Russian Academy of Sciences. We propose a new way to provide redundant, auxiliary power for nuclear power plants (NPPs) t...

This article is referring to a study regarding the energy consumption and data for the internal heat gains and opening hours at a big size commercial building built in Bucharest, Romania. The monitoring was done during the maintenance building period of time starting with the opening day till the present days. It was calculated the energy demand for heating, cooling, ventilation and lightning systems depending on the average daily running hours and on the internal heat gains for each type of area destination (like...

Multipurpose vehicles are trucks that were implemented in order to achieve some different equipment related to road works such as snow removal, sweeping and spraying the streets, roadside mowing, trimming trees etc. Multipurpose vehicles have two operating modes. ? Regime for marching. Rapidly moving vehicles from one location to another. Torque at the drive wheels is small and the speed is high. ? Technological regime. The vehicle traveling at a low speed (max 8 km/h) imposed by technology of working multifunctio...

ShakeMaps are one of the most applicative products of seismological research and monitoring, becoming available minutes after earthquakes. They are maps depicting the ground shaking produced by an earthquake and the estimated intensity distribution, being extremely useful for authorities, population, private sector and researchers too. However, the outcome of the result пїЅ consisting of easy to read maps representing the potential area affected, often hides the fact that many compromise decisions and uncertaintie...

When conducting underground works, it is necessary to take into account their possible consequences for underground and surface objects. The purpose of this work was to identify the need to use three basic methods for estimating and predicting the parameters of subsidence of the earth's surface and deep layers. The process of extracting minerals from the earth's interior leads to an increasing need for underground excavations beneath the area of protected objects (surface and underground). In this regard, engineer...

To comply with European UnionпїЅs rules regarding the environmental protection it is necessary for the all compound feed factories (CFF) to be fitted with modern and performant working equipments, with a high degree of mechanization, automation and computerization, with high productivity and low specific consumption, but also with opportunities for rigorous monitoring of pollutants and dust removed. Taking into account the complexity of the technological flow that takes place in a compound feed factory (CFF), this...

Construction and beginning of operation of reservoirs have significant impact on the environment. Resettlement of residents, flooding of a part of the river valley, changes in the river regime and ecosystems as well as mass movements are the most troublesome types of interactions. Such processes may be a little less noticeable when polders are designed. Management of geological resources i.e. mineral resources accumulated in the reservoir basin or in its vicinity is a significant task. It often happens that minera...

Widespread use of electronic regulators, in order to correlate the working parameters at sprinkling machines imposes making a study to assess the performances of the regulation process in working conditions. To achieve this objective were pursued the following aspects: adequate choice of system components; the achievement in own conception of a electronic regulator for automatic correlation of liquid flow with displacement velocity; choosing and preparing a sprinkling machine on which will be installed the achieve...

Many informatics tools have been developed based on extensive databases related to terrain modeling and technical objects of the existing hydropower developments. Among them, VAPIDRO-ASTE can be distinguished as a powerful and demonstrated tool, which can be used either for the evaluation of the hydropower potential and the optimization of the complex hydropower development of a river sector, or for the evaluation of an existing hydropower development in order to establish the need of the refurbishment and/or reha...

The aim of this study was to analyzed the effect of calcium ions from gluconate and lactate salt at the level of 100, 150 and 200 mg/100g addition on empirical dough rheological properties from the wheat flour type 1250. Dough empirical rheological properties were analyzed using the Farinograph, Amilograph, Glutograph, Alveograph, and Rheofermentometer devices. These devices allow us to obtain complete informations about dough rheological properties during mixing, pasting and fermentation process of wheat flour do...

Tarnow region is supplied with water from intensively exploited groundwater and surface water intakes located in the small area between Dunajec and Bia?a rivers. Three groundwater intakes are a part of the Tarnow Municipal Water Service, i.e. ?wierczkпїЅw, K?pa Bogumi?owicka and newly constructed Zbylitowska GпїЅra intake, as well as the intake of surface water in Zbylitowska GпїЅra. The chemical company Zak?ady Azotowe in TarnпїЅw has groundwater intake located in TarnпїЅw-Mo?cice, and one of surface water locate...

The problem of stress state evaluation is really actual for the underground structures been exploited for a long time. Stress and deformation monitoring give opportunity for hazard prevention and planning operation mode of the underground facility. One of the most common methods of deformation control is convergence measurement, but transformation of measured data into stress state of underground structures is quite difficult. A technique for stress state evaluation of underground structures on the base of the ana...

The article presents the results of the research carried out in order to assess the possibility of using surface water of the Dniester River in the Halych area, for the public supply of water intended for human consumption. These studies included double sampling of surface water in different seasons and their physicochemical analysis. This assessment was made on the basis of the received data in accordance with the Polish applicable requirements [1]. In addition, an assessment of the water status of the Dniester R...

The need for construction of new buildings is currently still growing. For construction are also used areas that were previously labelled as unsuitable or less suitable in terms of subsoil. The design, construction and implementation of building foundation, including subsoil modifications (foundation base) has a decisive influence on the building lifespan and its safety. This article presents an application of risk analysis method Umra (Universal Risk matrix analysis) to classify different types of subsoil. The me...

One of the main environmental problems nowadays is related to contaminated soils. Soils can be contaminated with different compounds among which, the most widespread being the petroleum hydrocarbons (PH). The contamination of soil with petroleum hydrocarbons (PH) could take place during oil exploration. In this context, contaminated soil remediation is highly necessary. Over the years, different treatment methods for contaminated soil remediation have been applied. The present research illustrates the thermochemic...

The paper deals with the fundamental rule of extensional logics, namely the rule of Existential Generalization. This rule can be applied in the situation when a function f is applied on its argument a to obtain the value of f at a. If the application does not fail, i.e., if the function f is defined at a, then we can existentially quantify, and derive that there is the value f(a). Our system is based on Transparent Intensional Logic (TIL). Since TIL is a hyperintensional, partial, typed lambda calculus, we examine...

Oil and gas complex is one of the key branches of the Russian economy and at the same time its activity is one of the largest sources of environmental damages. Safety of the environment, occupational safety as well as minimization of the technogenic risk are the sphere of regulation of a new management direction пїЅ HSE-management (from Engl. health, safety and environment). It allows us to coordinate the activities in protection of the environment, in safety of the staff and security of the technical objects. Imp...

In industrial power installations are encountered situations on the connection of inductive circuits to alternating voltage sources. These operations are accompanied by the occurrence of specific transitory regimes after which might occur over-voltages peaks which can become hazardous for the components of the circuit. The assessment of these over-voltages and of other specific electrical parameters represents the purpose of this paper. The measurement method is based on the usage of a data acquisition system prod...

The disconnection of inductive circuits from an alternating voltage source is accompanied by the occurrence of over-voltages, which often are hazardous for the components of the electrical circuit. In this paper is described a modern method for studying transitory regimes which occur at the disconnection of inductive circuits, based on a data acquisition system type NI-USB 6003. The software used is LabView and it is also developed by National Instruments, the developer of the data acquisition system. The paper ap...

In 2008, a new polymer substance FIRESORBпїЅ, used both as a fire extinguishing agent as well as a fire retardant, especially at wildland fires, was placed on the Slovak market. FIRESORBпїЅ gel, in general, due to its high density affects burning materials by even uniform cooling effect, reducing the rate of evaporation. This cooling effect is a dominant one at fires with origin of very high temperatures, where applying water streams would be ineffective due to near immediately water evaporation. The paper is deal...

New building materials were obtained in the last decades by using different types of cements, aggregates, additives or additions. Additions such as s powder, aggregate, fiber, etc. were tested for obtaining new properties of concrete or for finding a way to consume the wastes. The paper presents the experimental results obtained on fly ash concrete with waste fibers. The concrete was prepared with substitution of cement with fly ash in different dosages (10%, 15%, 20%, 30% and 40%) and two types of fibers (hemp an...

The growing demand for wastewater treatment encourages the development of alternative processes. Some of the main characteristics required of these alternative processes are a small footprint, ease of operation, low sludge generation and improved efficiency. Among the current technologies, the Membrane Bioreactor (MBR) and the Moving Bed Biofilm Reactor (MBBR) are alternatives that combine some of these required characteristics. On the other hand, ever since 1959, when the term пїЅnanotechnologyпїЅ was introduced,...

Modern buildings require energy-efficient heating and cooling method for the both parts of the system, the heating/cooling source and the heating/cooling distribution system. Modern heating and cooling systems typically combine a reversible heat pump with a low temperature radiant system. Thermally activated building systems (TABS) use the large thermal mass of concrete from building structure as a buffer for lowering the cooling and heating loads during the day. In this paper we illustrate the floor covering infl...

The paper deals with the implementation of photovoltaic system in specific extraterrestrial area. It is focused on proposal of photovoltaic system for new international space station. Authors use in the analysis knowledge of NASA (National Aeronautics and Space Administration) space researches, information about of ISS (International Space Station) and proposal of first piece of new space station situated in cislunar area (space between Earth and Moon). Analysis of space deals with finding suitable location for ne...

This paper describes the optimized algorithm for searching Hamiltonian path in graph. Formerly a similar algorithm was developed for the finding of the optimized path in terrain for finding of the precise positioning of Global Navigation Satellite Systems (GNSS) via Real Time Kinematics (RTK) method. The aim of this method is to achieve quality GNSS observation on all the points in question, so that the total length of the path within all these points can be minimized. There are nodes of two types in the graph: 1)...

Development of Fibre Engineered Cementitious Materials with Self-Healing Capacity (SH-FECM) was an important goal of the recent research programmes conducted in NIRD пїЅURBAN-INCERCпїЅ Cluj-Napoca Branch. Several theoretical and experimental studies were performed in order to improve the composites, considering both, fresh and hardened state properties and also the performance as filling material of the narrow spaces at the beam to column interface within the Hybrid spatial joint model [1]. Present studies are foc...

Fatigue damage is determined from time signals of loading, usually in the form of stress or strain. However, there are many design scenarios when the loading, or fatigue damage process, cannot easily be defined using time signals. In these cases the design/operation engineer usually has to use a test based approach to evaluate the fatigue life of the structure or the component. Alternatively, a frequency based fatigue calculation can be used where the loading and response are represented using Power Spectral Densi...

The main purpose of the construction of flood protection measure is to protect the urban area. Flood strategy should cover the entire river basin area and promote the coordinated development and management of actions regarding water, land and related resources. Structural measures (defence structures) will remain important elements and should primarily focus on the protection of human health and safety, and valuable goods and property. Intensive rainfall and springпїЅs snow melting occurrence leads to floods almos...

Calibrations of liquid flow meters are performed with primary standards that are based on measurements of the fundamental quantities; mass and time. Flow meters calibration are accomplished by timed collection of the measured mass of water flowing through the meter under test. Static gravimetric liquid flow meters calibration method is used as primary liquid flow standards. The method is based on the principle of measuring flow rate by static weighing and consists in: determining the initial mass of the weighing t...

We analyzed the dynamics of Lake Teletskoye water level and attempted to use data on bottom sediment geochemistry in combination with Siberian larch (Larix sibirica) tree-ring width chronology to reconstruct it for late Holocene. In particular, we studied the links among the water level characteristics, precipitation amount, bottom sediment geochemistry, and tree-ring width chronology available for Russian Altai. A correlation analysis revealed the annual water level fluctuations to correlate closely with mean ann...

Renewable energy is a key factor in the sustainable development of any modern society. The development of renewable energy project must continue to be part of a competitive economy and the research and innovation of this domain should be a priority. One of the renewable energy sources (RES) that are reliable, provides predictable energy, assures the energy supply in remote areas and at the end of the power transmission lines, are small hydro power plants (SHPP). In Romania SHPP are not new, being part of the devel...

The benefit of recycling industrial by-products in the construction industry led to growing interest in exploring and potentially exploiting these by-products, in the context of sustainable development, and in creating new materials. Fly ash is a type of byproduct waste, having enjoyed considerable attention, especially from the perspective of creating and perfecting fly ash based geopolymer concrete. In Romania, over 80% of industrial waste is deposited, this being the most widely used method of waste disposal. T...

After 1990, when Romania changed its political regime, many changes registered in the economic field. The new economic system had to experience the new form of transition from a Centralized to the Capitalism new one. The forestry field had been affected too, and it should adapt to the new conditions of the economic market demand. In the new economic conditions, it should adapt the offer with the demand. Taking into account the natural conditions, the tradition of wood processing and the predominance of the forest ...

The main goal was to define basic forms of propagation oriented at internet media and mainly for propagation oriented at social media for product entering at market. Nowadays, social media represent important marketing channel appropriate almost for every products at market. The advantage of propagation on social networks is low financing cost, what is good mainly for companies which are not so known at market. Because of that, we should consider social networks as information channel rather than means which will ...

The mineral deposits are important for the Russian Arctic. The resources of PGE minerals and gold, nickel and titanium are more than 10% of global significance. Meanwhile, the most arctic territory is out of availability for detail geological and geophysical prospecting due to severe climatic situation and difficult accessibility. The spatial relations of ore deposits and bearing formations of different geodynamic nature at Russia territory show that the geological sequences are of three basic types of geodynamic ...

By the example of the new highway project in Moscow, the paper scrutinizes in detail the evaluation procedure of the differential and integral economic risk caused by geological hazards. Based on the analysis of engineering geological conditions at the construction site as well as the projected design for highway and bridges, the hazard of landslides, karst and suffusion processes and waterlogging was assessed. It is proved that for any scenario of landslide process (either deep or shallow landslides), the risk of...

With the development of space technologies, satellite information and data from ground geophysical observatories are increasingly being used in scientific studies of various physical processes and, in particular, to identify effects in geophysical fields during periods of seismic activity. In this paper, we recommend to create the geographic information system (GIS) based on modern computer software for collection, processing, visualization and analysis of experimental geophysical terrestrial and satellite data du...

An evaluation of dinas quartzitesпїЅ deposits was carried out. Quartzites, quartzite sandstones and quartz sands with SiO2 content more than 96% are used are used for production of metallurgical furnaces. Objects of study were probable and proved reserves and resources of monomineralic quartzites of Vasylkivske and Tovkachivske deposits. Deposits are distinguished by mineralпїЅs quality, significant reserves and favourable conditions for open-pit mining. Reserves were calculated by the method of geological blocks ...