Implementation of lean manufacturing systems

Lean manufacturing allows improving the quality of products and services, ensuring the growth of labor productivity and the level of staff motivation, which affects the growth of the enterprise's competitiveness. Using a lean manufacturing system is very relevant, but lean manufacturing tools do not work without ideology. At the initial stage, it is better to focus on the 5S system, the essence of which is to restore order in the workplace. Lean manufacturing is a tool that can rejuvenate an enterprise and increase management efficiency, allowing it to compete in the global market

The effect of multiple paternity on genetic diversity during and after colonisation

In metapopulations, genetic variation of local populations is influenced by the genetic content of the founders, and of migrants following establishment. We analyse the effect of multiple paternity on genetic diversity using a model in which the highly promiscuous marine snail Littorina saxatilis expands from a mainland to colonise initially empty islands of an archipelago. Migrant females carry a large number of eggs fertilised by 1 - 10 mates. We quantify the genetic diversity of the population in terms of its heterozygosity: initially during the transient colonisation process, and at long times when the population has reached an equilibrium state with migration. During colonisation, multiple paternity increases the heterozygosity by 10 - 300 % in comparison with the case of single paternity. The equilibrium state, by contrast, is less strongly affected: multiple paternity gives rise to 10 - 50 % higher heterozygosity compared with single paternity. Further we find that far from the mainland, new mutations spreading from the mainland cause bursts of high genetic diversity separated by long periods of low diversity. This effect is boosted by multiple paternity. We conclude that multiple paternity facilitates colonisation and maintenance of small populations, whether or not this is the main cause for the evolution of extreme promiscuity in Littorina saxatilis.Comment: 7 pages, 5 figures, electronic supplementary materia

The adaptation of academics to the Covid-19 crisis in terms of work time allocation

Academics have seen their work environment and routines severely affected by the Covid19 pandemic. This topic has been analyzed by the literature, mostly from personal and descriptive perspectives, that highlight the challenging transitions and adaptations that academics have endured concerning their work and life-balance. This research complements those studies, by using a sample of university academics working all around the world in all disciplinary fields and focuses on a longitudinal perspective of workload and task time allocation of academic work. The findings show that academics which in general had long working hours, further increased their time of the week dedicated to work leading possibly to the reported cases in the literature of increasing stress and burnout during the pandemic. These effects were found to be similar to all academics, independently of their gender and disciplinary field. More concerning is that this increased number of hours worked per week appears to have established itself as part of the new normal. The main driver for the increased workload is associated with teaching, and to a lesser extent with administrative duties.info:eu-repo/semantics/publishedVersio

История рүcckοй эмиграции «первой волньі» в Түнисе.

RésuméL’histoire de l’immigration russe en Tunisie commence en hiver 1920-1921 lorsque, après la défaite des armées blanches contre les bolcheviks lors de la guerre civile et l’évacuation de la Crimée, 33 bateaux de l’Escadre impériale russe chargés de 6 000 réfugiés accostent dans le port de Bizerte Cette émigration militaire russe forme ainsi la première colonie russe de Tunisie. Jusqu’à la fin de l’année 1924, la vie de cette communauté s’organise essentiellement autour de la Marine russe. L’article se propose d’étudier l’histoire de cette immigration et de retracer la vie des « Russes blancs » de Tunisie sous ses différents aspects. Il examine en détail les questions liées à la présence de l’Escadre russe dans le port de Bizerte, décrit la vie des marins et de leurs familles, évoque le destin des bateaux, etc. Comment vivaient les Russes dans la Tunisie de l’époque coloniale ? Quelle place ont-ils occupée dans la société tunisienne ? Quel héritage, notamment culturel, ont-ils laissé ? L’auteur étudie à travers ces questions les problèmes sociaux, économiques, juridiques, culturels et religieux liés au processus d’intégration dans le pays d’accueil.AbstractThe History of “White Russian” emigration to Tunisia.The history of Russian emigration to Tunisia started in the winter of 1920-1921, when 33 ships of the Russian Imperial Squadron with 6,000 refugees docked in Bizerte after the White Army’s defeat in the Civil War and the evacuation of the Crimea. That event marked the formation of the first Russian colony in Tunisia, resulting from the emigration of Russian members of the military who had fought against the Bolsheviks during the Civil War. Until the end of 1924, the life of this community essentially organized itself around the Russian navy. The article studies the history of this immigration and describes the various aspects of the lives of Tunisia’s “White Russian” refugees. It closely examines questions related to the presence of the Russian squadron in the Bizerte harbor, describes the lives of sailors and their families, evokes the plight of ships, etc. How did the Russians live in colonial Tunisia ? What was their place in Tunisian society ? What cultural heritage have they left ? These questions guide the author’s study of social, economic, legal, cultural, and religious problems related to their integration into the host country

REVIEW оf the monograph V. Yu. Lukyanova “Technical regulation in the system of the Russian legislation”

Objective: to carry out a comprehensive analysis of a monograph by V.Yu. Lukyanova, devoted to one of the main elements of the legal institution of technical regulation - the technical norm.Methods: dialectic approach to the cognition of social phenomena, which enables to analyze them in historical development and functioning in the context of the integrity of objective and subjective factors; it determined the choice of the following research methods: formal-legal, comparative legal, etc. Results: the main approaches of the reviewed monograph were assessed which refer to the nature of technical norm, its position in the legislation on technical regulation. The reviewed monograph consists of an introduction, two sections, conclusion and bibliography. The introduction describes technical regulation at the modern stage of development, substantiates the topicality of the research, and briefly describes its structure. The first section is devoted to the legal nature of technical regulation. It explores such issues as: the development of concepts about the acts stipulating the mandatory requirements to products; the content of technical regulation; the forms of adopting technical regulations and their juridical force. The work also analyzes the role of technical regulation in the legislation system of the Russian Federation. In conclusion, the author proposes a systematic-parametric model of technical regulation in the Russian Federation.Scientific novelty: for the first time, the assessment is given to the provisions of the reviewed monograph, which refer to the nature of technical norm, limitations of its action both in time and space and by the circle of persons, the position in the modern Russian legislation. The conclusion is made that the monograph by V.Yu. Lukyanova should be published. Practical significance: the reviewer concludes that the monograph by V.Yu. Lukyanova can be used by specialists in the sphere of technical regulation and standardization, research workers, judicial authorities, students and post-graduate students

Determination of Au, Pb, Ni and Co in Mineral Raw Materials by Atomic Absorption Spectroscopy with Graphite Furnace

A method for quantitative determination of gold, lead, nickel, cobalt in a range of concentrations from mg/g to ng/g was proposed. Method consists of annealing, treatment with acids followed by extraction. Determination of nickel, cobalt and lead was carried out after the decomposition of the sample, without discharge of the sample matrix. Method was tested by certified reference material and various rock samples. Method can be applied for determination of corresponding metals in ores, rocks and waste mining industry

Physics and chemistry of producing silicon-hydroxylapatite-titanium composite materials

In the research, Si-HA poweders have been synthesized using SBF solution with different content of silicon. It was found that all the samples synthesized from the model solution of extracellular fluid under varying concentration of silicate ions are single-phase and repesent hydroxyapatite. The nature of the reagent containing SiO[44]- ions does not affect the hydroxyapatite structure. In the study of the surface and morphological characteristics of the phosphate coatings modified by silicon ions, it was found that as the degree of phosphate calcium substitution by SiO[44]- ions increases, the surface wettability on the titanium substrates deteriorates and cohesive energy decreases. It is shown that the titanium coating is formed in three stages. After irradiation of titanium substrates coated with Si-HA, the crystals can keep growing and the surface can keep regenerating

Stratigraphy and correlation of Lower-Middle Jurassic sediments in SE West-Siberian petroleum-bearing province

Based on the investigation of Lower-Middle Jurassic sediments in SW Siberia, isochron reference clay and coal horizons confined to the roof of chronostratigraphic units were identified; bed series from pre-Jurassic formation bottom to U[10] coal layer were divided; structural features and distribution of regional cyclites J[10]-J[17] in the sequences and throughout the area were determined