Developing Floating Constructed Wetland in Laboratory Scale as Domestic Waste Contaminant Reductor in Urban Waters

Low awareness of sanitation of urban citizens creates negative effects on the environment which varied. The triggering factors of the phenomenon are education and conservation technology. A conservation technology, eco-technology e.g. constructed wetlands, is proposed to solve the problem. Laboratory work is conducted to obtain comprehensive analysis about floating constructed wetland. The research paper aims to illustrate the efficiency performance of constructed wetlands, with domestic species, in the lab-scaled area from urban wastewater. The constructed wetland media is prepared horizontally. The analysis of its performance leads to a discussion of urban water quality. Samplings and laboratory tests are conducted to examine pH, phosphorus, nitrogen, suspended solids, conductivity, COD, and BOD. The benefit of Nasturtium officinale as FTW media reduce phosphate, nitrate, and BOD as 100% in 14 days. The discharge simulation during 14 days reduce TDS and TSS as 100%.

Study on the Suitability of Soils in Ilu Aba Bora Zone for Hydraform Block Production for Low Cost Construction

Due to a high construction material cost in Ethiopia, it is difficult to afford a shelter by most our peoples. The Hydra form block (HFB) has been identified as low-cost building material with its potential and possibility to reverse the housing problem. Laboratory tests were conducted on Mettu, Nopa, Gore, and Hurumu areas soil. Using hydra form machine with average mold size of 29*14*10cm, hydra form blocks were casted with the three percentages increment of cement. Compressive strength and water absorption tests were conducted at 28 days. The investigation has revealed that all the soil sample except Gore soil have significant characteristics that make it suitable for stabilization with recommended soil properties. From the experimental study, all the blocks except blocks produced with Gore soil have 28th day compressive strength values well above most of the recommended minimum values. Water absorption was less than the maximum limit of 15%. But, for control block and for stabilized with 3% cement, water absorption result is out of the recommended values (0-15) %. The cost comparison of Hydra form blocks with hollow concrete block and fired clay brick shows that the Hydra form block is cheapest walling material in terms of production cost and a typical hydra form block production center can create a job for more than 50 peoples.

Flotation classification in closed-circuit grinding as a way of reducing sulphide ore overgrinding

Research object and aim. Flotation classification in closed-circuit grinding is a way of improving copper ore flotation indicators by reducing minerals overgrinding. Due to valuable components froth recovery with their uncovering in the process of grinding, loss of copper in flotation tailings with secondary slime are reduced significantly. The research aims to study the possibility to improve the flotation of copper ore based on the use of flotation classification in the closed-circuit grinding. Methodology. In order to solve the problem, laboratory studies on closed-circuit grinding experimental modeling were carried out in a mode with and without flotation classification of hydraulic classification discharge. In each grinding mode, five stages of closed-cycle simulation have been implemented. Flotation classification was carried out in froth flotation modes with froth treatment with and without the tapered chute. According to experimental results, the loss of copper has been determined with slime in hydraulic classification discharge and flotation classification, and flotation classification end-product balance was calculated when operating in the closed-circuit grinding. Summary. The obtained experimental data prove the possibility of improving copper ore flotation by reducing minerals overgrinding in the course of flotation classification in closed-circuit grinding. The technology of flotation classification with froth treatment in tapered chutes make it possible to obtain prime concentrate with 18% copper mass fraction when extracting 37.7% copper into it, and final tailings in flotation classification discharge with 0.13% copper mass fraction under 2% loss.

Psychological and Pedagogical Resources of Warrior Yoga as a Tool for Musician’s Psychophysical Self-Regulation

The article discusses actual problem of musician’s psychophysical self-regulation in the modern world. The increase in the “degree of extreme” in musician’s profession puts forward increased requirements to his health and psychophysical stability, which is comparable to the requirements in combat sports and martial arts. The answer to these challenges is a “body-oriented” system of psychophysical self-regulation based on warrior yoga adapted for musicians. This system is being developped in the Problem laboratory of the Moscow Conservatory by the author professionally educated in music, sports and martial arts. The essence of the approach is described in the sections of the article, where yogic origins of modern bodyoriented systems, phenomenon and resources of warrior yoga are considered and conceptual guidelines are given, providing “navigation” in the content of adapted “warrior” methods and practices of psychophysical self-regulation.The latter are specified through links to the author’s publications and other sources. In conclusion, we touched upon the conduct of pilot master classes on the adapted complex of warrior yoga in the regions of Russia. It shows the relevance of such practices of psychophysical self-regulation in the musical and pedagogical community. It opens up prospects for their use in targeted consulting programs for teachers and students.

Modeling Results of Gas-Dynamic Characteristics of Low and Medium Flow Rate Model Stages for an Industrial Centrifugal Compressor

The paper presents the results of CFD calculations of two model stages with 2D impellers. The results were compared with the experimental characteristics obtained at the LPI Problem Laboratory. The centrifugal stage of the 2D impeller 0028-056-0373 was calculated for three different Mach numbers, with and without the gaps in the labyrinth seals. Calculations for the sector with one blade were performed using the NUMECA software, those for the full 360-degree model — in the ANSYS CFX software package. CFD calculations in all the cases gave an unacceptably high overestimation of the loading factor compared to the experimental data. It was established that the calculated characteristics of the stage efficiency leant towards high flow rates compared to the measured values. A stage of the 2D impeller 0048-048-029 was calculated for one Mach number without taking into account the gap in the labyrinth seals and for the full 360-degree model. A study of semi-empirical parameters and coefficients included in the SST turbulence model implemented in the ANSYS CFX software was carried out. The calculations showed that their choice for solving this class of problems had little effect on the calculation results, thus it was not possible to influence the loading factor.

Issues of gas dynamic characteristics modeling: a study on a centrifugal compressor model stage

The paper presents the results of CFD-calculations of a centrifugal compressor stage with a high-pressure 3D impeller and a vaneless diffuser. The stage was designed by Prof. A. M. Simonov in the Problem Laboratory of Compressor LPI according to the following design parameters: flow rate coefficient 0.080, loading factor 0.74, and the relative Mach number 0.78. Two design grids were used: 2.4 and 4.4 million cells for the sector with one blade. The entire stage was calculated with a sparser grid. Special “Stage” interface conditions are used to interface the gas-dynamic parameters at the boundary regions. The SST turbulence model was used in the calculations. The results of efficiency characteristics and work coefficient comparison showed the following: in design flow rate all three variants of the calculation overstate the loading factor by 14.3%; the calculated characteristics of polytrophic work coefficient in the staging of 360 degrees are closest to the experimental characteristics, but the absolute value is greater than 12% at a flow rate coefficient of 0.085; the maximum calculated efficiency of a stage (the circle of 360 degrees) is almost equal to the measured maximum efficiency.

PALATINI APPROACH TO MODIFIED GRAVITY: f(R) THEORIES AND BEYOND

We review the recent literature on modified theories of gravity in the Palatini approach. After discussing the motivations that lead to consider alternatives to Einstein's theory and to treat the metric and the connection as independent objects, we review several topics that have been recently studied within this framework. In particular, we provide an in-depth analysis of the cosmic speed-up problem, laboratory and solar system tests, the structure of stellar objects, the Cauchy problem, and bouncing cosmologies. We also discuss the importance of going beyond the f(R) models to capture other phenomenological aspects related with dark matter/energy and quantum gravity.