Disinfection of water in swimming pools by combined action of UV-light and ozone

Disinfection of water in swimming pools by combined action of UV-light and ozone / 258st American Chemical Society National Meeting and Exposition «Division of Environmental Chemistry», august 25-29, 2019, San Diego, CA. ENVR 394.P.5

Photodegradation of Polymer-dispersed perylene di-imide dyes

ArticleApplied Optics. 45(16): 3846-3851journal articl

Algorithm of constructing hybrid effective modules for elastic isotropic composites

The algorithm of constructing of new effective elastic characteristics of two-component composites based on the superposition of the models of Reiss and Voigt, Hashin and Strikman, as well as models of the geometric average for effective modules. These effective characteristics are inside forks Voigt and Reiss. Additionally, the calculations of the stress-strain state of composite structures with new effective characteristics give more accurate prediction than classical models do

Algorithm of constructing hybrid effective modules for elastic isotropic composites

The algorithm of constructing of new effective elastic characteristics of two-component composites based on the superposition of the models of Reiss and Voigt, Hashin and Strikman, as well as models of the geometric average for effective modules. These effective characteristics are inside forks Voigt and Reiss. Additionally, the calculations of the stress-strain state of composite structures with new effective characteristics give more accurate prediction than classical models do

Impact of socio-demographic structure of the deaf people communities in prevalence of hereditary hearing loss

Hearing loss caused by environmental or genetic factors concerns more than 10 % of the world population. It leads to disability and considerably reduces the life quality of deaf people. On average, 1 in 1,000 newborns are born deaf, and 50-60 % of cases are due to genetic causes. Nonsyndromic hereditary deafness is a monogenic disease with uniquely high genetic heterogeneity. The prevalence of some forms of genetic deafness varies in different populations and could be determined, as for many other genetic diseases, by the ethnic composition of a population, isolation, founder and «bottleneck» effects, the proportion of consanguineous marriages, and probable heterozygote advantage. It is assumed that high prevalence of hearing loss due to mutations in the GJB2 (Cx26) gene was also influenced by some social factors: a long-standing tradition of assortative marriages between deaf people, combined with growth of their social adaptation and genetic fitness. The start for these events was the breakdown of the deep social isolation of deaf people, which occurred about 300 years ago in Europe, and later in the US, when special schools for the deaf with learning sign language as a common tool for communication were established (linguistic homogamy). Computer simulations and comparative retrospective study showed that over the past 200 years these social processes can have doubled the frequency of deafness in the US caused by the GJB2 gene mutations. Information about the sociodemographic structure of deaf communities in the past is extremely limited by an almost complete lack of relevant archival data. Nevertheless, studies of sociodemographic and medical-genetic characteristics of deaf people’s contemporary communities are important for predicting the prevalence of inherited forms of deafness, as well as for understanding the impact of social factors on the evolutionary processes occurring in human populations

Ultraviolet disinfection of activated carbon and its use for microbiological decontamination

As a water treatment technique, UV-light is known to be an effective disinfectant due to its strong germicidal ability. It is efficient as well for microbiological decontamination of numerous medicinal products, including activate carbon (charcoal).257st American Chemical Society National Meeting in Orlando, FL «Green Chemistry & the Environmental », march 31- April 4, 2019, Orlando, Florida

Ultraviolet disinfection of activated carbon and its use for microbiological decontamination

As a water treatment technique, UV-light is known to be an effective disinfectant due to its strong germicidal ability. It is efficient as well for microbiological decontamination of numerous medicinal products, including activate carbon (charcoal).257st American Chemical Society National Meeting in Orlando, FL «Green Chemistry & the Environmental », march 31- April 4, 2019, Orlando, Florida

Exciton and biexciton signatures in femotosecond transient absorption of {pi}-conjugated oligomers

The authors report femotosecond transient-absorption studies of a five-ring oligomer of polyphenylenevinylene (PPV) prepared in two different forms: as solid-state films and dilute solutions. Both types of samples exhibit a photoinduced absorption (PA) band with dynamics which closely match those of the stimulated emission (SE), demonstrating unambiguously that these features originate from the same species, namely from intrachain singlet excitons. Photo-chemical degradation of the solid-state samples is demonstrated to dramatically shorten the SE dynamics above a moderate incident pump fluence, whereupon the dynamics of the SE and the long-wavelength PA no longer coincide. In contrast to solutions, solid-state films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the efficient formation of non-emissive inter-chain excitons. Correlations in the subpicosecond dynamics of the two PA features, as well as the pump intensity-dependence provide strong evidence that the formation of inter-chain excitons is mediated by intrachain two-exciton states. At high pump levels, the authors see a clear indication of interaction between excited states also in dilute solutions. This is manifested as a superlinear pump-dependence and shortening of the decay dynamics of the SE. They attribute this behavior to the formation of biexcitons resulting from coherent interaction between two excitons on a single chain