Társadalmi konfliktusokat generáló ökológiai történések a Balaton életében az utóbbi néhány évtizedben – Halpusztulások

Social Conflict Generating Ecological Developments in the Life of Lake Balaton in Recent Decades – Mass Fish Kills In this paper we summed up the history and causes of the mass fish kill events documented at Lake Balaton during the last 50 years. The first catastrophic fish kill (resulting in 500 t dead fish) was caused by the leaching of PCBs used on the catchment area of the lake in 1965. From the 1970s to the end of the ’90s, in parallel with the increasing eutrophication fish kills became more frequent, which impacted the whole fish fauna and spread over the lake. In the last years with the ongoing oligotrophication the mass kills terminated. Only sporadic species specific deaths were registered.Social Conflict Generating Ecological Developments in the Life of Lake Balaton in Recent Decades – Mass Fish Kills In this paper we summed up the history and causes of the mass fish kill events documented at Lake Balaton during the last 50 years. The first catastrophic fish kill (resulting in 500 t dead fish) was caused by the leaching of PCBs used on the catchment area of the lake in 1965. From the 1970s to the end of the ’90s, in parallel with the increasing eutrophication fish kills became more frequent, which impacted the whole fish fauna and spread over the lake. In the last years with the ongoing oligotrophication the mass kills terminated. Only sporadic species specific deaths were registered

Társadalmi konfliktusokat generáló ökológiai történések a Balaton életében az utóbbi néhány évtizedben – A halfogás csökkenése

Social Conflict Generating Ecological Developments in the Life of Lake Balaton in Recent Decades – Decreasing Fish Catches The fisheries sector was the chief utilizer of fish stocks living in the Lake Balaton for centuries, however with recreational use in the forefront the importance of angling has considerably increased in the last sixty years. Due to the diminishing of spawning areas of native fish species, the unadvised stocking of non native ones (silver carp, eel), and the ongoing oligotrophication during the last fifteen years the fish stock size and composition of the lake has changed significantly. Decreasing fish catches and contrasting intrests generate numerous conflicts between fishermen and recreational anglers.Social Conflict Generating Ecological Developments in the Life of Lake Balaton in Recent Decades – Decreasing Fish Catches The fisheries sector was the chief utilizer of fish stocks living in the Lake Balaton for centuries, however with recreational use in the forefront the importance of angling has considerably increased in the last sixty years. Due to the diminishing of spawning areas of native fish species, the unadvised stocking of non native ones (silver carp, eel), and the ongoing oligotrophication during the last fifteen years the fish stock size and composition of the lake has changed significantly. Decreasing fish catches and contrasting intrests generate numerous conflicts between fishermen and recreational anglers

Particulate Fillers in Thermoplastics

The characteristics of particulate filled thermoplastics are determined by four factors: component properties, composition, structure and interfacial interactions. The most important filler characteristics are particle size, size distribution, specific surface area and particle shape, while the main matrix property is stiffness. Segregation, aggregation and the orientation of anisotropic particles determine structure. Interfacial interactions lead to the formation of a stiff interphase considerably influencing properties. Interactions are changed by surface modification, which must be always system specific and selected according to its goal. Under the effect of external load inhomogeneous stress distribution develops around heterogeneities, which initiate local micromechanical deformation processes determining the macroscopic properties of the composites

FORMATION OF FIXED PARAMAGNETIC SOLITONS IN A POLYACETYLENE ANALOGUE POLYMER MATRIX : ESR STUDIES IN THERMALLY DECOMPOSED PVC

Les auteurs présentent des résultats expérimentaux concernant l'estimation de l'étendue des solitons paramagnétiques SSH dans un polymère analogue au polyacétylène.We present experimental results concerning estimation of SSH paramagnetic soliton width in a polyacetylene analogue polymer