Processing of rare metals containing waste of copper production

The article presents the research results processing rare metal-containing waste to produce osmium, rhenium concentrate using technical sulfur. Installed, the optimum leaching conditions sulfided waste. Presented results of microstructural analysis of electron-rhenium-osmium concentrate

Processing of rare metals containing waste of copper production

The article presents the research results processing rare metal-containing waste to produce osmium, rhenium concentrate using technical sulfur. Installed, the optimum leaching conditions sulfided waste. Presented results of microstructural analysis of electron-rhenium-osmium concentrate

Charge and Discharge Behaviour of Li-Ion Batteries at Various Temperatures Containing LiCoO2 Nanostructured Cathode Produced by CCSO

There are technical barriers for penetration market requesting rechargeable lithium-ion battery packs for portable devices that operate in extreme hot and cold environments. Many portable electronics are used in very cold (-40 °C) environments, and many medical devices need batteries that operate at high temperatures. Conventional Li-ion batteries start to suffer as the temperature drops below 0 °C and the internal impedance of the battery increases. Battery capacity also reduced during the higher/lower temperatures. The present work describes the laboratory made lithium ion battery behaviour features at different operation temperatures. The pouch-type battery was prepared by exploiting LiCoO2 cathode material synthesized by novel synthetic approach referred as Carbon Combustion Synthesis of Oxides (CCSO). The main goal of this paper focuses on evaluation of the efficiency of positive electrode produced by CCSO method. Performance studies of battery showed that the capacity fade of pouch type battery increases with increase in temperature. The experimental results demonstrate the dramatic effects on cell self-heating upon electrochemical performance. The study involves an extensive analysis of discharge and charge characteristics of battery at each temperature following 30 cycles. After 10 cycles, the battery cycled at RT and 45 °C showed, the capacity fade of 20% and 25% respectively. The discharge capacity for the battery cycled at 25 °C was found to be higher when compared with the battery cycled at 0 °C and 45 °C. The capacity of the battery also decreases when cycling at low temperatures. It was important time to charge the battery was only 2.5 hours to obtain identical nominal capacity under the charging protocol. The decrease capability of battery cycled at high temperature can be explained with secondary active material loss dominating the other losses

Processing of rare metals containing waste of copper production

The article presents the research results processing rare metal-containing waste to produce osmium, rhenium concentrate using technical sulfur. Installed, the optimum leaching conditions sulfided waste. Presented results of microstructural analysis of electron-rhenium-osmium concentrate

Metabolic syndrome and angiotensin II receptor antagonists

Aim. To investigate the effects of angiotensin II receptor antagonist irbesartan on blood pressure (BP), tissue insulin sensitivity, carbohydrate and lipid metabolism, cerebral perfusion parameters in patients with arterial hypertension (AH), metabolic syndrome (MS), and Type 2 diabetes mellitus (DM-2). Material and methods. The study included 20 patients with AH only, 20 participants with AH + MS, and 20 individuals with AH + DM-2. At baseline and 24 weeks later, physical examination and measurement of body weight, blood glucose, immune-reactive insulin levels, insulin sensitivity index (intravenous insulin4modified glucose tolerance test) were performed. Cerebral perfusion was assessed by single-photon emission computed tomography with 99mTc-HMPAO. Results. Irbesartan therapy demonstrated good antihypertensive effect: target BP levels were achieved in 80% of AH patients, 70% of AH + MS participants, and 50% of AH + DM-2 individuals. Waist circumference reduced in all participants; blood glucose and lipid levels, initially increased, reduced significantly in AH + MS and AH + CD-2 patients. Blood insulin level, increased at baseline, decreased in AH + MS individuals, and insulin secretion improved in AH + DM-2 patients. Insulin sensitivity improved in all participants, but only in AH + MS it was statistically significant. Irbesartan therapy also improved cerebral perfusion, initially reduced, in all patient groups. Conclusion. Irbesartan demonstrated not only good anihypertensive effectiveness, but also positive metabolic and organo-protective effects

Determination and substantiation of parameters of the self-cleaning sowing device for seeding of the granulated and powdery mineral fertilizers

The self-cleaning sowing device for seeding of the granulated and powdery mineral fertilizers which can also work at increases of their humidity is offered. For this purpose, elastic scrapers are fixed in fillets of the coil. The differential equation of the fourth order which describe the oscillating motion of a scraper is received. Its solution has allowed establishing time dependences of amplitude, frequency and oscillation period of a scraper