Peculiarities of formation of water quality of surface sources of water supply as a factor of a choice of a method of water treatment

The current state and formation of water quality in reservoirs that serve as sources of drinking water supply were considered. It was revealed that phytoplankton becomes one of the main factors influencing the formation of water quality in reservoirs in the warm period from June to November, especially during the period of reservoirs “blooming”. Mostly these processes are triggered by the explosive development of blue-green algae (cyanobacteria). The factors accompanying this phenomenon are shown. The characteristic of the influence of global climate change and new composition of wastewater on water quality in surface water supply sources is given. If earlier the sewage contained significant volumes of heavy metals, oil products, phenols, etc., now they are observed to decrease at several times and vice versa - an increase in the volume of biogenic compounds, especially phosphates is observed. The emergence of phosphates is caused both by the ingress of phosphate fertilizers into water bodies, and by household reasons - the massive distribution of phosphate-based detergents and the inability of existing sewage treatment plants to efficiently process them. Screening monitoring of the Dnieper river basin showed extremely high levels of the predicted safe concentration of herbicides, insecticides, fungicides, as well as pharmaceutical substances such as carbomazepine, lopinavir, diclofenac, efavirenz, etc. in water. That is, among organic pollutants, the focus changes from classic petrochemical products to the products related to agricultural and pharmaceutical production, which, in certain concentrations, can stimulate the development of phytoplankton. The effective methods for treating surface water in modern conditions are as follows: - physical retention of coarse fractions of phytoplankton using new designs of water intake structures; - the use of new filter materials that effectively trap finely dispersed phytoplankton fractions at the main treatment facilities and are capable of regenerating the filter media; - the use of new oxidizing agents-disinfectants that do not form toxic organochlorine compounds, with preliminary extraction of phytoplankton masses;

Keeping Meta-Analyses Hygienic During the COVID-19 Pandemic

Despite the massive distribution of different vaccines globally, the current pandemic has revealed the crucial need for an efficient treatment against COVID-19. Meta-analyses have historically been extremely useful to determine treatment efficacy but recent debates about the use of hydroxychloroquine for COVID-19 patients resulted in contradictory meta-analytical results. Different factors during the COVID-19 pandemic have impacted key features of conducting a good meta-analysis. Some meta-analyses did not evaluate or treat substantial heterogeneity (I2 > 75%); others did not include additional analysis for publication bias; none checked for evidence of p–hacking in the primary studies nor used recent methods (i.e., p-curve or p-uniform) to estimate the average population-size effect. These inconsistencies may contribute to contradictory results in the research evaluating COVID-19 treatments. A prominent example of this is the use of hydroxychloroquine, where some studies reported a large positive effect, whereas others indicated no significant effect or even increased mortality when hydroxychloroquine was used with the antibiotic azithromycin. In this paper, we first recall the benefits and fundamental steps of good quality meta-analysis. Then, we examine various meta-analyses on hydroxychloroquine treatments for COVID-19 patients that led to contradictory results and causes for this discrepancy. We then highlight recent tools that contribute to evaluate publication bias and p-hacking (i.e., p-curve, p-uniform) and conclude by making technical recommendations that meta-analyses should follow even during extreme global events such as a pandemic.

A Stochastic Kinetic Type Reactions Model for COVID-19

We propose two stochastic models for the Coronavirus pandemic. The statistical properties of the models, in particular the correlation functions and the probability density functions, were duly computed. Our models take into account the adoption of lockdown measures as well as the crucial role of hospitals and health care institutes. To accomplish this work we adopt a kinetic-type reaction approach where the modelling of the lockdown measures is obtained by introducing a new mathematical basis and the intensity of the stochastic noise is derived by statistical mechanics. We analysed two scenarios: the stochastic SIS-model (Susceptible ⇒ Infectious ⇒ Susceptible) and the stochastic SIS-model integrated with the action of the hospitals; both models take into account the lockdown measures. We show that, for the case of the stochastic SIS-model, once the lockdown measures are removed, the Coronavirus infection will start growing again. However, the combined contributions of lockdown measures with the action of hospitals and health institutes is able to contain and even to dampen the spread of the SARS-CoV-2 epidemic. This result may be used during a period of time when the massive distribution of vaccines in a given population is not yet feasible. We analysed data for USA and France. In the case of USA, we analysed the following situations: USA is subjected to the first wave of infection by Coronavirus and USA is in the second wave of SARS-CoV-2 infection. The agreement between theoretical predictions and real data confirms the validity of our approach.

Evaluating the effectiveness of integrated marketing communications while implementing a CRM system in the agricultural industry

This article deals with the problem of insufficient objective characteristics for determining the productivity of integrated marketing communications in business and organizations of various fields of activity, including those involved in ecology, energy, etc. The relevance of the work is due to the massive distribution of various marketing communications tools, often customized and used today through CRM systems. The aim of the study is to determine the criteria for evaluating the effectiveness of integrated marketing communications tools, reflected in CRM systems. The author uses methods of the structural and functional approach. The research is based on the descriptive and analytical method. The result of the work is a list of parameters reflected in the CRM system. They can help consider the degree of effectiveness of integrated marketing communications used in business and organizations of various fields of activity, including those involved in the field of ecology, energy, etc. Moreover, the list of criteria can be used to determine the degree of successful implementation of a CRM system and individual tools of integrated marketing communications.

A Stochastic Compartmental Model for COVID-19

We propose two stochastic models for the Coronavirus pandemic. The statistical properties of the models, in particular the correlation functions and the probability density function, have duly been computed. Our models, which generalises a model previously proposed and published in a specialised journal, take into account the adoption of the lockdown measures as well as the crucial role of the hospitals and Health Care Institutes. To accomplish this work we have analysed two scenarios: the SIS-model (Susceptible ⇒ Infectious ⇒ Susceptible) in presence of the lockdown measures and the SIS-model integrated with the action of the hospitals (always in presence of the lockdown measures). We show that in the case of the pure SIS-model, once the lockdown measures are removed, the Coronavirus will start growing again. However, in the second scenario, beyond a certain threshold of the hospital capacities, the Coronavirus is not only kept under control, but its capacity to spread tends to diminish in time. Therefore, the combined effect of the lockdown measures with the action of the hospitals and health Institutes is able to contain and dampen the spread of the SARS-CoV-2 epidemic. This result can be used during a period of time when the massive distribution of delivery of a limited number of vaccines in a given population is not yet feasible. By way of example, we analysed the data for USA and France where the intensities of the noise have been estimated by Statistical Mechanics. In particular, for USA we have analysed two possible hypotheses: USA is still subject to the first wave of infection by and USA is in the second (or third) wave of SARS-CoV-2 infection.The agreement between theoretical predictions and real data confirms the validity of our approach.

K počátkům peněžní směny v Čechách / Notes to the beginning of the monetary exchange in Bohemia

Since the break of the 8th and 9th centuries, the people in Bohemia were in intensive contacts with the Western Christian world represented by the powerful Frankish Empire. This is well documented by activities of the Bavarian missionaries in Bohemia and objects of the Western provenance found there (e.g. weapons, various decorations, etc.). Also the number of the Carolingian deniers registered in Bohemia significantly increased recently. Territorial expansion, engagement of the Přemyslid Bohemia in the profitable long-distance trade in the 10th century and the close Přemyslid contacts with the Bavarian milieu led to the production of the Bohemian coins at the beginning of the 960s – the deniers copying the BavarianSwabian prototypes. Introduction of these coins into the local exchange was not that simple. The coins struck in the 9th and 10th centuries were predominantly used by traders in long-distance trade and by ruling elites. Their larger and massive distribution can be taken into consideration since the beginning of the 11th century.

A Survey Study on the Defects Found in Low-Income Housing: Case Study Seongnam City Korea

The purpose of this study is to understand what health and safety hazards low-income households are subject to by surveying the real conditions of the defective housing of low-income households, and to find improvement strategies. For this purpose, we visited the concentrated areas of the multi-dwelling unit (MDU) (also known as multi-family residential) housing in Jungwon-gu and Sujeong-gu in Seongnam City, Kyunggi-do, one of the representative areas in Korea with a massive distribution of the low-income class. Based on the survey data, the level of housing defects were comparison analyzed per income decile (decile 1, decile 2, deciles 3–4), and per housing location, in the categories of subsidence, cracks in the wall, delamination, water leakage/infiltration, condensation, and contamination. The housing condition per income class was more defective in the decile 2 households rather than in the decile 2 households, and in the substructure more than in the superstructure. Among the six defects, contamination problems, caused by sub-standard living conditions, were the most frequent cases. Structural defects, subsidence and cracks in the wall, were found in the main living areas—the bedrooms and the living rooms. It was confirmed in this study that the conditions of low-income housing are serious, and that it is necessary to explore specific countermeasures in the near future.

Visual Center of Gravity and Ratio of the Split Screen

the Divine Proportion has a dominant position in the picture composition; however, the picture perfect dichotomy screen out by its reasoning can not solve the massive distribution. In traditional quickly composition, due to the impact of 4:3 TV format, people are accustomed to the screen is divided into nine cells, because they are used by equipment manufacturers to provide the average split-screen "Well-shaped" dividing line; With the prevalence of 16:9 high-definition TV and panoramic photography, photography cameraman shooting 16:9, this average segmentation approaches have failed to provide the composition with the help of. If you are still using the Divine Proportion different screen geometry segmentation, we can draw a dividing line position proportion that is consistent with the Divine Proportion in line with the physiological visual center of gravity of the human eye: 28:44:28; The new segmentation photography cameraman will provide a more convenient and quick reference picture composition.