A TORQUE OF EARLY ROMAN TIME FROM KALINOVO (KALININGRAD REGION, RUSSIA): THE COMPOSITION OF ENAMEL AND DATA ON CHRONOLOGY AND ORIGIN

В статье рассмотрен химический состав и техника нанесения красной эмали гривны, производной от типа Хавор, происходящей из могильника Калиново самбийско-натангийской культуры (Калининградская обл.). Гривна датирована второй половиной I - второй третью II в. н. э. Установлено, что эмаль была изготовлена по «кельтскому» рецепту с высоким содержанием меди и свинца. Однако если состав в данном случае является скорее хронологическим, чем культурноопределяющим признаком, то его сочетание с техникой нанесения эмали (в прорезные углубления-насечки) заставляет искать прототипы данного украшения среди образцов кельтского эмальерного ремесла. Данные о хронологии и технологической традиции, в которой изготовлена гривна, полученные на основании стилистического анализа и состава эмали, хорошо согласуются с результатами комплекса исследований, посвященных данной находке. The article considers the chemical composition and technique of applying the red enamel on the torque derived from the Havor type, originating from the cemetery of Kalinovo of Sambian-Natangian culture (Kaliningrad region). The torque dates back to the second half of I - second third of II c. AD. The enamel was produced using «Celtic» recipe with high copper and lead content. The composition of the enamel in this case is rather chronological than a culturally determining indication. However, its combination with the technique of enamelling (in the slotted recessing notches) gives grounds to search for the prototypes of this decoration among the samples of the Celtic enamel craft. The data on the chronology and technological tradition in which the torque was made, obtained on the basis of stylistic analysis and data on the enamel composition, well agree with the results of a comprehensive studies of this find.

Diatomite Dynamic Membrane Fouling Behaviour during Dewatering of Chlorella pyrenoidosa in Aquaculture Wastewater

Combined microalgal and membrane filtration could effectively treat aquaculture wastewater; however, the membrane fouling induced by extracellular organic matter (EOM) during the dewatering process is an issue. This study investigated diatomite dynamic membrane (DDM) fouling behaviour during the dewatering of Chlorella pyrenoidosa under the influence of copper ions. The results indicate that copper ion heavy metals in aquaculture wastewater significantly affected purification and algae dewatering by DDM. Aquaculture wastewater with a high copper concentration (1 and 0.5 mg/L) could induce serious DDM fluxes and cake layer filtration resistance (Rc), whereas fewer filtration fluxes were induced when aquaculture wastewater had a low copper concentration, particularly that of 0.1 mg/L, at which the Rc was lowest and the concentration effect was highest. Macromolecular organics of EOM, such as biopolymers, polysaccharides, and proteins, were responsible for DDM fouling and accumulated mostly in the slime layer, whereas only a small amount of them accumulated in the diatomite layer. The DDM rejected more protein-like organics of EOM in the slime layer when dewatering algae at low copper concentrations (<0.1 mg/L); however, when using the DDM to dewater algae at high copper concentrations, more polysaccharides of EOM were rejected (0.5 < Cu2+ < 5 mg/L). This result has significant ramifications for aquaculture wastewater treatment as well as algae separation and concentration by the DDM.

The Chilean economy, an analysis of the dynamics of profits, investments and production: A Marxist approach

This article aims to examine the dynamics of the Chilean economy as a consequence of actions taken by companies whose aim is to make profits. As such, the economic analysis used is Marxist and makes use of those classical indicators described in Capital (Rate of Surplus-Value, Organic Composition of Capital and Rate of Profit). It is maintained that with the Marxist method, we can discover that behind the accumulation of incomes lies the fact that out of each 8 hours worked, only 3 finance wages and 5 benefit the owners of capital. That fraction of the unpaid labour received by capital but invested back as new capital, plus that ‘excess’ surplus value that is consequence of high copper prices, raises the physical, but not necessarily the value, capital-per-worker ratio. As a consequence, that relation of exploitation to capital accumulation, which Marx called the Rate of Profit, is found to fall, rise and then fall again. We understand that various approaches have been made to calculate the classical indicators and include some of them as alternative methods in our results.

Disease Prevention through Lifestyle: A Case of the Copper to Zinc Ratio and Insulin Sensitivity

Both type 2 diabetes mellitus and a high ratio of copper to zinc are independently associated with comorbidities involving multiple organs. Separately, patients with poor insulin sensitivity are often reported as having high copper and low zinc. This article reports the case of a 46-year-old male patient interested in reversing his insulin resistance and high copper to zinc ratio, therefore reducing his long-term risk of Alzheimer’s disease. Over a period of 16 weeks, through lifestyle changes and controlling for copper in the patient’s food and water supply, the patient’s copper to zinc ratio improved from 1.91 to a healthy level of 0.55 and his HOMA-IR score improved from 2.0 to a nondiabetic level of 1.2.

Copper Recovery and Reduction of Environmental Loading from Mine Tailings by High-Pressure Leaching and SX-EW Process

The flotation tailings obtained from Bor Copper Mine contain pyrite (FeS2) and chalcopyrite (CuFeS2), these sulfide minerals are known to promote acid mine drainage (AMD) which poses a serious threat to the environment and human health. This study focuses on the treatment of mine tailings to convert the AMD supporting minerals to more stable forms, while simultaneously valorizing the mine tailings. A combination of hydrometallurgical processes of high-pressure oxidative leaching (HPOL), solvent extraction (SX), and electrowinning (EW) were utilized to recover copper from mine tailings which contain about 0.3% Cu content. The HPOL process yielded a high copper leaching rate of 94.4% when water was used as a leaching medium. The copper leaching kinetics were promoted by the generation of sulfuric acid due to pyrite oxidation. It was also confirmed that a low iron concentration (1.4 g/L) and a high copper concentration (44.8 g/L) obtained in the stripped solution resulted in an improved copper electrodeposition current efficiency during copper electrowinning. Moreover, pyrite, which is primarily in the mine tailings, was converted into hematite after HPOL. A stability evaluation of the solid residue confirmed almost no elution of metal ions, confirming the reduced environmental loading of mine tailings through re-processing.