REGENERATIVE BURNER DEVICE

SUBSTANCE: invention refers to heat engineering, can be used in metallurgy and other industries for combustion of gaseous fuel at various thermal plants, mainly high-temperature ones. The effect is achieved in regenerative burner device containing a regenerative heat exchanger arranged in the furnace lining and having a nozzle from corundum balls put to the housing mounted in the furnace lining and the walls of which are made at an angle of natural slope of corundum balls, which is 30°-35°. EFFECT: ensuring compactness of regenerative burner device arranged in the furnace lining and its serviceability by replacing corundum balls of the nozzle without stopping the furnace and removing the burner.Изобретение относится к теплоэнергетике, может быть использовано в металлургии и других отраслях для сжигания газообразного топлива в различных тепловых агрегатах, преимущественно высокотемпературных, и обеспечивает при своем использовании компактность размещенного в кладке печи регенеративного горелочного устройства и технологичность его обслуживания путем замены корундовых шаров насадки без остановки печи и демонтажа горелки. Указанный технический результат достигается в регенеративном горелочном устройстве, содержащем размещенный в кладке печи регенеративный теплообменник с насадкой из корундовых шаров, насыпанных в смонтированный в кладке печи корпус, стенки которого выполнены под углом естественного откоса корундовых шаров, составляющим 30°-35°

The results of strengthening the foundation with a bored pile with an enlarged pile base

The article presents the results of static tests of a strip foundation fragment, strengthened with a bored pile, which has an enlarged pile base at its lower end. To evaluate the results obtained, tests were also carried out for the static load of a strip foundation fragment without strengthening with a bored pile with an enlarged pile base and a separately located bored pile with an enlarged pile base. According to the data obtained during tests for static load, dependence graphs were constructed: settlements of a strip foundation fragment without strengthening with a pile with an enlarged pile base from the pressure under its toe and settlement of a bored pile with an enlarged pile base from the static indentation load. As a result, it was found that the use of a bored pile with an enlarged pile base as strengthening of a strip foundation fragment made it possible to increase the maximum allowable pressure under the toe of a strip foundation fragment on the ground by an average of 25% and reduce the settlement of a strip foundation fragment by an average of 43%

Optimizing the multimode Brownian oscillator model for the optical response of carotenoids in solution by fine tuning of Differential evolution

During last twenty years, the Differential evolution algorithm (DE) has proved to be one of the powerful methods to solve minimization problems for multidimensional functions. Being a member of the family of evolutionary optimization algorithms, its main principle is based upon the concepts of natural selection and mutation. In this study, we test the potential of DE to find a proper set of parameters for the multimode Brownian oscillator model, which was then used to simulate absorption lineshapes of carotenoid molecules in solution: spheroidene and spheroidenone. This theory assumes that the correlation function of a particular electronic state of the carotenoid is calculated using the semiclassical spectral density function. Considering our previous studies on photosynthetic pigments, we employed several DE strategies to do fitting of the carotenoid experimental spectra. We found that simulated absorption spectra are very sensitive to several parameters that characterize carotenoid vibronic modes, namely, Huang-Rhys factors. Fine tuning of DE crossover parameter (Cr) and the scaling factor (F) provided acceptable convergence of the algorithm. It appears that to get good convergence of DE, a certain spectral range of carotenoid absorption from 400 nm to 600 nm must be chosen. This fact can be explained by the limitations of the applied theory, which simply does not predict properly the carotenoid absorption at higher frequencies

Carotenoid-dependent singlet oxygen photogeneration in light-harvesting complex 2 of Ectothiorhodospira haloalkaliphila leads to the formation of organic hydroperoxides and damage to both pigments and protein matrix

Earlier, it was suggested that carotenoids in light-harvesting complexes 2 (LH2) can generate singlet oxygen, further oxidizing bacteriochlorophyll to 3-acetyl-chlorophyll. In the present work, it was found that illumination of isolated LH2 preparations of purple sulfur bacterium Ectothiorhodospira haloalkaliphila with light in the carotenoid absorption region leads to the photoconsumption of molecular oxygen, which is accompanied by the formation of hydroperoxides of organic molecules in the complexes. Photoformation of two types of organic hydroperoxides were revealed: highly lipophilic (12 molecules per one LH2) and relatively hydrophobic (68 per one LH2). It has been shown that illumination leads to damage to light-harvesting complexes. On the one hand, photobleaching of bacteriochlorophyll and a decrease in its fluorescence intensity are observed. On the other hand, the photoinduced increase in the hydrodynamic radius of the complexes, the reduction in their thermal stability, and the change in fluorescence intensity indicate conformational changes occurring in the protein molecules of the LH2 preparations. Inhibition of the processes described above upon the addition of singlet oxygen quenchers (L-histidine, Trolox, sodium L-ascorbate) may support the hypothesis that carotenoids in LH2 preparations are capable of generating singlet oxygen, which, in turn, damage to protein molecules