In this paper, we introduce a new method for solving variational inequality problems with monotone and Lipschitz-continuous mapping in Hilbert space. The iterative process is based on well-known ...projection method and the hybrid (or outer approximation) method. However we do not use an extrapolation step in the projection method. The absence of one projection in our method is explained by slightly different choice of sets in the hybrid method. We prove a strong convergence of the sequences generated by our method.
The taxonomic composition, abundance, and diversity of bacterial and fungal communities in the rhizosphere loci and bulk mass of the gray forest soil (Eutric Retisol (Loamic, Aric, Cutanic, Humic)) ...under potatoes, maize, and white mustard grown with the application of mineral and organic fertilizers were compared. Among bacteria,
Bacillus megaterium
and
Paenibacillus polymyxa
species predominated in all the experimental variants. The micromycete community was represented by 39 species belonging to 19 genera. Under the impact of organic fertilizers, the abundance of
Trichoderma harzianum—
an antagonist of many phytopathogens—increased. A decrease in the abundance of representatives of
Fusarium
genus was observed both in the rhizosphere and in the bulk soil. Fertilization was the most significant factor determining the structure and diversity of micromycete communities both in the soil and rhizosphere. The application of mineral fertilizers reduced the diversity of micromycetes in soil, whereas the use of organic fertilizers increased it. In general, organic fertilizers proved to be more favorable for the rhizosphere and bulk soil mycobiomes and for the total soil suppressiveness than the mineral fertilizers.
The early 21st century was marked by several severe winters over Central Eurasia linked to a blocking anti-cyclone centered south of the Barents Sea. Severe winters in Central Eurasia were frequent ...in the 1960s when Arctic sea ice cover was anomalously large, and rare in the 1990s featuring considerably less sea ice cover; the 1960s being characterized by a low, the 1990s by a high phase of the North Atlantic Oscillation, the major driver of surface climate variability in Central Eurasia. We performed ensemble simulations with an atmospheric general circulation model using a set of multi-year Arctic sea ice climatologies corresponding to different periods during 1966-2012. The atmospheric response to the strongly reduced sea ice cover of 2005-2012 exhibits a statistically significant anti-cyclonic surface pressure anomaly which is similar to that observed. A similar response is found when the strongly positive sea ice cover anomaly of 1966-1969 drives the model. Basically no significant atmospheric circulation response was simulated when the model was forced by the sea ice cover anomaly of 1990-1995. The results suggest that sea ice cover reduction, through a changed atmospheric circulation, considerably contributed to the recent anomalously cold winters in Central Eurasia. Further, a nonlinear atmospheric circulation response to shrinking sea ice cover is suggested that depends on the background sea ice cover.
Plants selectively attract particular soil microorganisms, in particular consumers of root-excreted compounds. It is unclear to what extent cultivar type and/or growth stage affect this process.
...DNA-based pyrosequencing was used to characterize the structure of bacterial communities in a field cropped with potato. The rhizospheres of six cultivars denoted Aveka, Aventra, Karnico, Modena, Premiere and Desiree, at three growth stages (young, flowering and senescence) were examined, in addition to corresponding bulk soils. Around 350,000 sequences were obtained (5,700 to 38,000 per sample). Across all samples, rank abundance distributions best fitted the power law model, which indicates a community composed of a few highly dominant species next to numerous rare species. Grouping of the sequences showed that members of the Actinobacteria, Alphaproteobacteria, next to as-yet-unclassified bacteria, dominated. Other groups that were consistently found, albeit at lower abundance, were Beta-, Gamma- and Deltaproteobacteria and Acidobacteria. Principal components analyses revealed that rhizosphere samples were significantly different from corresponding bulk soil in each growth stage. Furthermore, cultivar effects were found in the young plant stage, whereas these became insignificant in the flowering and senescence stages. Besides, an effect of time of season was observed for both rhizosphere and bulk soils. The analyzed rhizosphere samples of the potato cultivars were grouped into two groups, in accordance with the allocation of carbon to starch in their tubers, i.e. Aveka, Aventra and Karnico (high) versus Premiere and Desiree (low) and thus replicates per group were established.
Across all potato cultivars, the young plant stages revealed cultivar-dependent bacterial community structures, which disappeared in the flowering and senescence stages. Furthermore, Pseudomonas, Beta-, Alpha- and Deltaproteobacteria flourished under different ecological conditions than the Acidobacteria.
The 1,3-dipolar cycloaddition reaction of isoquinolinium ylides to nitrostilbenes provides an approach to 1,2-diarylpyrrolo2,1-
isoquinolinium-3-carboxylates and then to a complete hexacyclic ...lamellarin core.
The flow of a gas or liquid can be visualized by recording and analyzing successive images of the particle distribution on the surface of the object determining the parameters of motion. However, ...this approach allows visualizing the distribution of solid particles without evaluating particle mass and density. The paper outlines results on determining the mass and density of suspended particles through exposing the particle flow to acoustic radiation. We used the method of visual image processing in flow of particles entrained by an acoustic field having known frequency and amplitude during at least two periods of acoustic oscillations. We also took into account the relaxation of particles in the measuring plane confined using a light sheet. The basic mathematical expressions are derived from estimating the mass, density, velocity field, and shape of particles using digital image processing and temperature measurement in the flow region. A schematic diagram is constructed and the design of a device to implement the diagnostic method is outlined. The approach proposed can be applied to determine parameters of suspended particles in medicine, biology, ecology, powder metallurgy, and other areas of science and technology.
In this review, our current understanding of the species Escherichia coli and its persistence in the open environment is examined. E. coli consists of six different subgroups, which are separable by ...genomic analyses. Strains within each subgroup occupy various ecological niches, and can be broadly characterized by either commensalistic or different pathogenic behaviour. In relevant cases, genomic islands can be pinpointed that underpin the behaviour. Thus, genomic islands of, on the one hand, broad environmental significance, and, on the other hand, virulence, are highlighted in the context of E. coli survival in its niches. A focus is further placed on experimental studies on the survival of the different types of E. coli in soil, manure and water. Overall, the data suggest that E. coli can persist, for varying periods of time, in such terrestrial and aquatic habitats. In particular, the considerable persistence of the pathogenic E. coli O157:H7 is of importance, as its acid tolerance may be expected to confer a fitness asset in the more acidic environments. In this context, the extent to which E. coli interacts with its human/animal host and the organism's survivability in natural environments are compared. In addition, the effect of the diversity and community structure of the indigenous microbiota on the fate of invading E. coli populations in the open environment is discussed. Such a relationship is of importance to our knowledge of both public and environmental health.
PurposeAdvertising intensity is treated either as a resource that allows firms to create competitive advantages (intangible asset view) or as an investment to build advertising resource (investment ...expense view). This current research supports the investment expense view. The authors do so by examining the moderating role of firm age (a proxy for knowledge) in the relationship between advertising intensity and performance as well as the influence of cultural communication styles on this moderation.Design/methodology/approachSecondary data were collected from multiple sources. With a sample of 262 companies from 10 countries (149 firms from high-context cultures and 113 firms from low-context cultures), ordinary least squares was used to estimate the regression coefficients to test the hypotheses. An instrumental variable approach with two-stage least squares estimates was used to address an endogeneity bias. Average industry advertising intensity excluding the focal firm was used as an instrumental variable.FindingsThe findings demonstrate that firm age significantly moderates the advertising intensity/performance relationship, but this moderation is only significant in high-context cultures. These findings imply that firms within high-context cultures must continually invest in advertising expenditures, while firms in low-context cultures may not need to do so to increase performance.Practical implicationsThe results of this study provide insight into the debate of whether advertising expenditures boost performance, as well as provide international marketing managers with a clearer picture on how to invest in advertising within their respective markets.Originality/valueA majority of the studies that examine the advertising intensity/performance link rely solely on the resource-based view. The authors utilize a multi-theoretical perspective to provide a fine-grained understanding of this relationship. Moreover, the authors apply the investment expense view to examine advertising intensity as an investment to build advertising resources, rather than a resource. This investment must be incorporated with the knowledge to properly employ the investment to develop advertising resources. Further, the authors find that firms expanding into high-context cultures must devote more effort into developing advertising capabilities to properly employ advertising resources than firms in low-context cultures.
We describe theoretically the depairing effect of a microwave field on diffusive s-wave superconductors. The ground state of the superconductor is altered qualitatively in analogy to the depairing ...due to a dc current. In contrast to dc depairing, the density of states acquires, for microwaves with frequency ω_{0}, steps at multiples of the photon energy Δ±nℏω_{0} and shows an exponential-like tail in the subgap regime. We show that this ac depairing explains the measured frequency shift of a superconducting resonator with microwave power at low temperatures.
The cross section for absorption of neutrinos from the artificial neutrino sources
37
Ar,
51
Cr, and
65
Zn by
82
Se nuclei is calculated. The experimental data on
82
Se(
3
He,
t
)
82
Br ...charge-exchange reaction are used in calculations. It is shown that
82
Se is a perspective isotope for setting up the calibration experiments aimed at searching for new types of neutrinos.
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