0000000000302833
AUTHOR
Mariana Dumitru
showing 12 related works from this author
STRUCTURE AND DEVELOPMENT OF THE RURAL TOURISM NETWORK „BIENVENUE A LA FERME”
2014
This paper presents the main rural tourism networks in France and the forms of rural tourism encountered in this country. In the data presented lies a bibliographic study on the development of rural tourism network "Bienvenue a la ferme" between 1996 and 2013. Data analysis presented highlights rural tourism forms with the most dynamic development in the period considered, given that France is the first European country where the level of organization, diversification and promotion of rural tourism took place.
Studies on Using Sugar Beet for Bio-Ethanol for Vehicle Motors
2011
The paper presents some researches on using sugar beet for producing bio-ethanol, considering the advantages which this raw material presents compared to other materials from which bio-ethanol can be obtained. One of the reasons of using bio-ethanol for motors as a fuel is the goal to reduce of 20% of greenhouse gases and it is established that the emissions of CO2 are much reduced in the case of bio-ethanol than that of conventional fuels.
RESEARCHES ON THE DIGESTERS AND REACTORS WHICH CAN BE USED IN A FARM SCALE BIOGAS PLANT
2014
In the general context of searching integrated system of renewable energy production, this paper present some researches on the reactors and the digesters, as a main part of a biogas plant at a farm scale. After we present the most used types of digesters, we also concentrated over the processes which take place into a digester, one of them being the removal of H2S from biogas (desulphurisation), which can be made by various methods, either biological or chemical, taking place inside or outside the digester. In the case of biological desulphurization outside the digester, we concentrate on the types of reactors which can be used in this case. Beside the well known types of reactors, we pres…
STUDY ON WASTE WATER TREATMENT PLANTS
2015
Biogas is more and more used as an alternative source of energy, considering the fact that it is obtained from waste materials and it can be easily used in cities and rural communities for many uses, between which, as a fuel for households. Biogas has many energy utilisations, depending on the nature of the biogas source and the local demand. Generally, biogas can be used for heat production by direct combustion, electricity production by fuel cells or micro-turbines, Combined Hest and Power generation or as vehicle fuel. In this paper we search for another uses of biogas and Anaerobe Digestion substrate, such as: waste water treatment plants and agricultural wastewater treatment, which are…
Researches on Grain Harvesting Machines
1970
The purpose of the paper is to present some researches made on the mechanisms of the combine for cutting, feeding and threshing. There are presented the floating cutter bar, the combine with a spike-tooth cylinder and rotary separation, the combine with dual threshing and separating rotors.
 Some of the adjustments are made on the finger sensors for cutter bar. One of the most important adjustment is that made in order to reduce harvest loss. Forward speed is one of the main factor in optimizing the performance of a combine harvester. The method used in the paper is that of direct observing and measuring made on different component parts of combines.
Researches on the Alternative Fuels Which Can Be Used to Motors
2010
The alternative fuels are substances or materials used as fuel, other than the old conventional fuels (oil, natural gases and coals). 
 The paper analyses the most important alternative fuels, such as: bio-diesel, alcohols and hydrogen, presenting at each category the main important characteristics, the advantages and disadvantages presented by them. 
 The methyl-ester which is known as bio-diesel can be used in all motors with ignition by compression, alone or mixed in any proportion with oil, with minor modifications at the injection system. Bio-diesel fuel assures the same motor power as oil does, having even a bigger cetanic number than the usual oil. After tests, it was obser…
STUDIES AND RESEARCHES CONCERNING THE POSSIBILITY OF USING HYDROGEN IN TURBO ENGINES
2014
The paper aims to study the main aspects related to using Hydrogen as fuel in thermal engines, the advantages and disadvantages of using it as fuel and the technical posibilities of adjusting it, Hydrogen used as supplement at the main fuel and Hydrogen used as working fluid. As a perspective, it can be considered using Hydrogen as thermical agent in a closed energetic flux with thermo- chemical compression of Hydrogen in a hybrid heat changer, based on the heat of burning products of thermical engines. The experiments made showed that using such a way of using the heat of burning products of turbo engines can assure the increase of power and efficiency of the whole instalation with 20 %, w…
DEVELOPMENT TRENDS OF BIOGAS
2015
All over the world, researches are made in order to improve the technologies, the operational and process stability and performance of biogas plants, because the world markets for biogas increased considerably in Europe and all over the world. In this paper we studied the most important parameters related to a biogas plant, starting from the ecologic landfill of Cristian, Sibiu, a landfill which storages industrial and household waste. In this respect, we studied operational parameters, such as organic load and hydraulic retention time, and parameters for evaluation of a biogas plant. Also, we made a case study concerning the evaluation of used waters in the landfill described above under t…
CONSIDERATIONS OVER A BIOGAS PLANT COMPONENTS
2014
This paper starts from the conviction that one of the main environmental problems of today’s society is the continuously increasing production of organic wastes. In many countries, sustainable waste management have become major political priorities in order to reduce pollution and greenhouse gas emissions and to avoid, as much as possible, global climate changes. This problem becomes more and more present in our country too. Production of biogas through anaerobic digestion of animal manure and slurries as well as of a wide range of digestible organic wastes, converts these substrates into renewable energy and offers a natural fertiliser for agriculture. That is why we consider that biogas p…
Researches on the Advantages for the Environment of Using Bio-Fuels to Vehicles
2011
The paper presents researches on the possibilities and advantages for the environment of using bio-fuels , especially bio-ethanol and bio-gas. The international context is favorable to using bio-fuels, considering that a direction of European Union establishes that in 2020, 20% of the energy consumption of Romania must be provided by rechargeable energy. One source for producing bio-fuels, not so much used until now is sugar beet. Sugar beet wastes are estimated as 1.22 times sugar production, since the total dry matter of processing wastes and field wastes exceed the weight of sugar in the ratio of 55:45. The novelty of the present paper approach is the fact that sugar beet is less used fo…
Researches on the Hydraulic Systems of Actioning the Suspension Mechanisms at Tractors
2010
SUMMARY The agricultural machines are coupled to tractor th rough the suspension mechanism in three points. The actioning of the suspension mechanisms is made by some hydraulic systems, which have the following component parts: tank, pu mp, distributer, valves, hydraulic cylinders, filters and hydraulic prizes. These systems must assure, between others, lifting in a convenient time of the carried machine from the work position to that of transport position, to allow the maintaining of the machine in any intermediary position, between the l owest limited position and the upper limited position and to assure the posibility to th e carried machine to follow the irregularities of the ground dur…
STUDIES ON THE CONSTRUCTION AND FUNCTIONING OF MACHINES FOR FERTILIZER DISTRIBUTION
1970
SUMMARY The researches were made on the machine of fertiliz er distribution MA 3,5, which has a capacity of 3,5 m 3 . It is used for transport and spreading solid chem ical fertilizers. It is tracted by tractor U 650 and is actioned from the p ower prize of tractor and from the right support wheels. This machine is formed of frame with catching equipment, bin, distribution equipment, transmision and mechanisms of adjustment and getting in function. The metal frame is supported by 2 pairs of wheels w ith tires, which afford a big mobility during work to the machine . . The distributor is of centrifugal type, formed of a horizontal disc with 6 pallets with adjusted position. Above the disc is…