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PRIMA PAGINĂ ECOTERRA NUMĂRUL 10(34)/2013


Ecoterra, no. 34, pp. 1-6, 2013
NEW DEVELOPMENTS IN GRAVITY CONCENTRATION OF CRITICAL RAW MATERIALS
NEW DEVELOPMENTS IN GRAVITY CONCENTRATION OF CRITICAL RAW MATERIALS

Imre Gombkötő, József Bőhm
University of Miskolc, Institute of Raw Material Preparation and Environmental Processing

Nowadays regions of the developed countries (Europe, United States and Japan) suffer from the repeating effects of several crises. Reasons for these crisis phenomena are the disruption of the current balance of raw material sources disposal and the higher cost and insecurity of import which has had easy access so far. The existence of suitable quantity and quality of raw material is essential for the European and Hungarian economy; therefore, EU has required the assessment, exploration and evaluation of strategic importance mineral resources in its member states. The worldwide production of some materials mainly comes from a handful of countries, for example: China - Rare Earths Elements (REE), Russia, South Africa - Platinum Group Elements (PGE), Democratic Republic of Congo – Cobalt, etc. In the EU as well as inside in Hungary the importance of the so called 14 critical elements has been recognized. In the TÁMOP-4.2.2.A-11/1/KONV-2012-0005 project, the Institute of Raw Materials Preparation and Environmental Process Engineering in cooperation with the Institute of Mineralogy and Geology of the University of Miskolc work on the exploration of the primary and secondary raw critical material sources in Hungary. Within the frame of the project, new developments of gravity concentration and their possible role within the processing of critical raw materials are presented.


Ecoterra, no. 34, pp. 7-12, 2013
KURGANS AS LANDSCAPE ELEMENTS PROTECTED BY THE EUROPEAN COMMUNITY
KURGANS AS LANDSCAPE ELEMENTS PROTECTED BY THE EUROPEAN COMMUNITY

Attila Rákóczi
Szent István University, PhD School of Environmental Sciences, Gödöllő, Hungary

Our research aims at overviewing the present and the past of kurgans, which are our national values, furthemore it also aims at throwing light on their future under the new agricultural system of the EU in connection with cross-compliance. We will present both the historical background of the formation of Cumanian mounds, and their relationship with human society in the past centuries. They were of administrative, religious and burial importance in the early centuries. From botanical aspect they are valuable as landscape elements at present because of the specific way they were formed. Unfortunately, the different agricultural activities resulted in their continuous deterioration and their number also decreased over the past centuries. There were remarkable changes in agricultural regulation concerning Cumanian mounds in the EU – and in Hungary too – in 2010. They were declared protected landscape elements therefore they became part of cross-compliance. In our research we will check the results of the new regulation in relation to the changes in the state of Cumanian mounds in Békés County. Although our research has been carried out for a short time, the positive effects of the new regulation can be seen from nature conservation point of view.


Ecoterra, no. 34, pp. 13-19, 2013
GIS ASSESSMENT OF VISUAL QUALITY ALONG THE MAJOR THOROUGHFARES OF PéCS
GIS ASSESSMENT OF VISUAL QUALITY ALONG THE MAJOR THOROUGHFARES OF PéCS

Péter Gyenizse
University of Pécs, Institute of Geography, Pécs, Hungary
Tibor Elekes
University of Miskolc, Department of Geography, Miskolc, Hungary
Zita Bognar, Sándor Németh
University of Pécs, Doctoral School of Earth Sciences, Pécs, Hungary

Good panorama has a positive psychological influence. Numerous methods have been elaborated for aesthetic quality assessment. We apply a GIS method for the assessment of the visual quality of an area of mixed land cover of Pécs (Hungary). Our goal is the establishment of the value for part of a residential area in a diverse environment, based on the visibility of the area from characteristic points. In addition, statistical approaches were also applied for the relationship between elevation above sea level and the visual quality of the landscape. For the purposes of the study the best lookout points were designated along these roads. The localities are arranged on W to E and N to S cross-sections of the town.


Ecoterra, no. 34, pp. 20-27, 2013
MATHEMATICAL MODELING AND SIMULATION OF THE LEVELS AND VOLUMES OF WATER TANKS FOR WATER SUPPLY SYSTEM
MODELAREA MATEMATICă şI SIMULAREA EVOLUţIEI NIVELELOR şI VOLUMELOR DE APă DIN REZERVOARELE UNUI SISTEM DE ALIMENTARE CU APă

Petrică D. Toma
S.C. Apa Nova Bucureşti S.A. , Romania

This paper presents a chain of a water supply system and the mathematical model of the evolution of water levels and volumes of storage tanks at the pumping stations of water supply system. The mathematical model was developed using the program developed by the author of this article in Scilab-Xcos. Also, the paper presents a simulation example.


Ecoterra, no. 34, pp. 28-35, 2013
STUDY ON THE REPRODUCIBILITY OF THE “FISH-HOOK” PHENOMENON AT GAYCO M-92 AIR CLASSIFIER
STUDY ON THE REPRODUCIBILITY OF THE “FISH-HOOK” PHENOMENON AT GAYCO M-92 AIR CLASSIFIER

Krisztina Kaliczné Papp
Institute of Raw Materials Preparation and Environmental Processing University of Miskolc, Hungary

In the ‘80-‘90s the presence of the so-called “fish-hook” effect was under discussion at hydrocyclones because according to several researchers it was a random mistake in the examination. This phenomenon exists in the air classification also, but there is no accessible information about such systematic experiments which deal with the reproducibility of this effect. In frame of a doctoral research work experiments were made with laboratory Gayco M-92 centrifugal air classifier to observe the reproducibility of the separation at given operating parameters. In this paper the results of these experiments are presented related to the standard deviation of the separation functions and the shape of the “fish-hook” at air classification. During the experiments were adjusted optimal ranges of operating parameters based on earlier laboratory examinations and semi-industrial researches which made by the Institute of Raw Materials Preparations and Environmental Processing, University of Miskolc, Hungary. According to the results of the experiments can be concluded, that the reproducibility of the separation was very well in case of each measurement, and the “fish-hook” is not a sporadic phenomenon as several researches claimed.


Ecoterra, no. 34, pp. 36-41, 2013
GERMANY AND ROMANIA - COMPARATIVE ASPECTS FROM AN ECOLOGICAL POINT OF VIEW
GERMANIA şI ROMâNIA - ASPECTE COMPARATIVE DIN PUNCT DE VEDERE ECOLOGIC

Vasile Anton
Universitatea Babeş-Bolyai din Cluj-Napoca, Facultatea de Științe Economice și Gestiunea Afacerilor, Cluj-Napoca, România

This paper aims to identify some aspects concerning the environment of Germany and Romania. We analyzed some energy sources of those two countries and ways to recycle. We also analyzed the effects of acid rain and we give some solutions to combat them.


Ecoterra, no. 34, pp. 42-48, 2013
MODELLING AND SIMULATION NUTRIENT-PHYTOPLANKTON-ZOOPLANKTON INTERACTION IN A LAKE
MODELAREA MATEMATICă şI SIMULAREA INTERACţIUNII NUTRIENT-FITOPLANCTON-ZOOPLANCTON îNTR-UN LAC

Petrică D. Toma
S.C. Apa Nova Bucureşti S.A. , Romania

In this paper is presented the mathematical model of nutrient-phytoplankton-zooplankton interaction in the water of a lake. The mathematical model was developed using Scilab-Xcos program and allows the visualization of the temporal evolution of the following parameters: phytoplankton carbon equivalent Ca, carbon equivalent phosphorus Cp, total zooplankton Z and carbon equivalent Ct. Also in this work is presenting an example of simulation parameters mentioned above under varied process parameters influencing raise or lower (water temperature, water depth lake minimum daily solar radiation intensity, and so on).


Ecoterra, no. 34, pp. 49-53, 2013
SOME CONSIDERATIONS UPON BOTANICAL RESERVATION „LA SăRăTURA” FROM BLăJENII DE JOS, BISTRIţA-NăSăUD COUNTY
CONSIDERAţII ASUPRA REZERVAţIEI BOTANICE ,,LA SăRăTURă” DE LA BLăJENII DE JOS, JUD. BISTRIţA-NăSăUD

Cristina Rusu, Claudiu Gavriloaie
Colegiul Tehnic INFOEL Bistriţa, România

The botanical reservation called „La Sărătură” is situated in Blăjenii de Jos, Şintereag village, Bistriţa-Năsăud county. It is one of the few places from our county where the salt emerges to the soil surface, thus appearing some salt springs, salted efflorescences and specific plant species. This location here is the single natural habitat from our country where we can find the species Armeria maritima (Sea Thrift, Sea Pink, Common Thrift), Plumbaginaceae family. Botanical reservation called „La Sărătură” is a stricted protected area of natioanl interest, being classified in the IVth IUCN category and it is part of Natura 2000 Programme.


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