The paper informs about a foundation of seismic observatory at Arctowski's Station in the beginning og 1978. Descriptions of the object and of registration seismic instruments are included. Conditions of registration and parameters of instruments are noted. Registration sequence of seismic tremors from March 1978 to October 1979 is described. A preliminary statistics of tremors is also announced.
Today there are two separate regimes of liability for oil pollution damage: the international regime, which is based on multilateral conventions, and the autonomous United States regime. After the US Administration’s decision to withdraw from the international system (1989), the US Congress enacted the 1990 Oil Pollution Act (OPA). This piece of legislation was passed in the aura of public demand for stringent regulation of oil pollution damage to marine environment. The OPA allows states to enact laws that would furnish greater protection to the injured parties than federal law.
The US is a known critic of the international regime due to its low liability limits and exclusion of environmental damage. Accordingly, there are numerous differences between the US regime and the international one. The OPA has a wider scope as it covers also oil spilled from facilities and bunker oilspills. Furthermore, the US legislation offers superior protection to the injured as it adopts a wider definition of oil pollution damage. Thus, the Author argues, the OPA embodies the polluter pays principle (PPP) to a greater extent than the international system
This investigation is concerned with the extraction of nugget copper particles from copper recovery plant slag which recycled of copper scrap. For this purpose, the Falcon concentrator was used because of its enhanced gravity properties. The Falcon concentrator has a fast spinning bowl which creates a centrifugal force to separate fine size minerals on the basis of their density differences. In the tests, the tailings of the copper recovery plant were used and the test sample was divided into two groups and one of them was classified in narrow particle sizes. The operational parameters were determined as particle size, centrifugal force and washing water pressures. The water pressure and centrifugal force have an inversely proportional relationship. Because of this phenomenon, the G/P parameter was created. The test conditions were applied to the whole distribution sample and narrow size distribution samples in the same way.
The test results indicate that the average grade was elevated from 1.04% to 6.50% with the recovery of 15.07% and 619% enrichment ratio for narrow sizes, whereas grade was elevated to 4.36% with 13.24% recovery and 415.94% enrichment ratio for the whole distribution. As a result, the recovery and grade values of concentrates are not good enough for gravity concentration process for both samples. However, this process was applied to the double recycled material and the lower recovery, grade values can be tolerated because of concentrate is nugget copper metal. The concentrate can also be washed in cleaning table for increasing the grade value for adding to initial feed of plant. This process can, therefore, supply important earnings not only economically but also environmentally.