The conditions of coal seam mining in the mines of Ukraine have been considered. The problem of conducting coal mining by longwalls in the conditions of soft adjoining rocks, which concerns the ...protection of mine roadways located near the face, has been revealed. In such conditions, the existing protective constructions are ineffective due to the fact that they yield and get pressed into the soft rocks of the footwall. This indicated the need for research into the geomechanical state of soft rocks of the footwall. According to the results of known studies on the mechanism of rock mass failure around roadways and the data of physical and mechanical properties of the coal mass, which is represented by soft rocks, the correlation dependence has been obtained, the use of which allowed for the determination of the parameters of the rock deformation diagram and the establishment of the stability criterion of footwall rocks under the protection means and stability conditions of the geotechnical system “protective construction – adjoining rocks.” They are the basis of a new approach to ensure the stability of the roadways, which are supported behind the faces, by controlling the stress state in the system “protective construction – adjoining rocks.” This may be the basis for the development of new methods of protecting roadways in conditions of soft adjoining rocks.
In the context of Russia’s current war against Ukraine, the need for the European world to disseminate systematic knowledge about the culture and art of Ukraine, which for a long time has been ...considered by Europeans exclusively in the context of the culture of the aggressor country, is becoming more urgent. Thus, it is crucial to distinguish Ukrainian culture/mentality and restore and strengthen Ukraine’s positive image on the world stage, in particular, by promoting the identity of Ukrainian culture. The purpose of the research is to identify and substantiate the priorities of personal and professional development of a socially responsible subject of cultural and artistic diplomacy in Ukraine, based on the value of national art education, which can reveal/form humanity in a person. The study used the methods of analysis, synthesis, deduction, comparison, and abstraction. The scientific value of the research results lies in an updated understanding of the professional formation of the subject of cultural diplomacy – a cultural ambassador who meets the needs of the modern world community for a new vision and new motivation for the system of training artistic and creative personnel. First of all, a trinity of such basic directions as developing a case of new knowledge that will determine the creative potential of art education in the processes of democratisation of Ukrainian society; justifying the feasibility of creating strategies of dialogue through respect for the Other; refuting the arguments introduced by authoritarian systems that tend to produce hybrid war hysteria. The study reveals the importance of training artists as cultural ambassadors to establish the true significance of Ukraine’s culture at the international level and identifies ways to improve the image of the state through the implementation of effective art education. The conclusions of the study will be useful for scholars in an in-depth study of the concept of “cultural diplomacy”, as well as for politicians and cultural critics in choosing approaches to restoring a positive emotional colouring of the image of Ukraine in the world public consciousness through Ukrainian culture and art.
Purpose is to identify regularities of miners’ injuries in the process of manufacturing operations based upon assessment of labour conditions in terms of energy intensity of a body. Methods. Analysis ...of the basic manufacturing operations, monitoring of a working process and functional conditions of bodies of miners, involving methods of mathematical statistics, determined the probability of injury of miners according to the value of their energy losses. Findings. It has been proved that to avoid potentially hazardous situation it is required to take into consideration energy cost of the performed operations which should correspond to psychophysical potential of miners. Conditional boundary of difficult continuous restless activities has been identified. It is 290 W being the upper boundary of energy losses. If the difficulty index is more than 290 W then the probability of injury of miners is 74%. If the index is 290 up to 464 W then the probability is 60%. Originality. A relationship between injury level of miners and difficulty of the performed operations has been identified; the relationship is assessed with the help of energy losses by their bodies. Methods to analyze accidents in terms of their situational patterns have been proposed. The methods rely upon a workplace analysis as well as activities before an adverse event and labour conditions in terms of energy losses by victims. Practical implications. Methods to identify difficulty of labour of miners and duration of compensatory breaks during work performance have been developed. The methods may be quite useful while investigating accidents, assessing labour conditions of miners, and technical documenting. Moreover, they are necessary for the development of measures making labour of miners safe.
Razmatrani su uvjeti kod otkopavanja ugljena u rudnicima Ukrajine. Problem je otkopavanje ugljena metodom širokoga čela kada su stijene male tvrdoće („mekane”), je je time otežana zaštita rudničkih ...prostorija i cesta smještenih u blizini radilišta. U takvim slučajevima zaštitne konstrukcije postaju beskorisne jer se utiskuju u podinske stijene na radilištu. U radu su uspoređeni rezultati studija koje su ispitivale uvjete loma stijena ispod rudničkih prostorija (potkopa) te fizička i mehanička svojstva ugljena i okolnih stijena male tvrdoće. Iz toga je bilo moguće izračunati varijable stijenske deformacije te odrediti kriterije stabilnosti podinskih stijena. Zatim su utvrđeni uvjeti stabilnosti za geotehnički sustav „zaštitne konstrukcije – okolne stijene”. On je temelj za novi pristup u održavanju rudničkih prostorija, poglavito u prostoru iza čela radilišta, a uz kontrolu pritiska na i u stijenskome sustavu. Tako se mogu kontrolirati i uvjeti u rudničkim prostorijama, posebno onima koje služe za odvoz sirovine, a okružene su stijenama male tvrdoće.
In this work, we study the effect of the various substrates on the growth and superconducting properties of NbN thin films grown by using pulsed laser ablation in a N
+ 1%H
atmosphere on MgO, Al
and ...Si substrates. Structural and superconducting analyses of the films demonstrate that using MgO and Al
substrates can significantly improve the film properties compared to Si substrate. The X-ray diffraction data indicate that MgO and Al
substrates produce highly oriented superconducting NbN films with large coherent domain size in the out-of plane direction on the order of layer thickness and with a superconducting transition temperature of 13.1 K and 15.2 K, respectively. On the other hand, the NbN film grown on the Si substrate exhibits random polycrystalline orientation. Together with the smallest coherent domain size it leads to the lower critical temperature of 8.3 K. Finally, by using a passivation surface layer we are able to improve superconducting properties of NbN thin film and we observe superconducting transition temperature 16.6 K, the one of the highest value reported so far for 50 nm thick NbN film on sapphire.
Oncologic outcomes of radical prostatectomy in 106 patients with clinically locally advanced prostate cancer were demonstrated. The mean follow-up was 50.6 (12-129) months. 5-year recurrence-free ...survival was 47.7 %, 5-year cancer-specific and overall survival - 85.8 %. Patients were devided into three different risk groups: low risk patients had PSA level <20 ng/ml, biopsy Gleason score ≤6 and absence of the seminal vesicle invasion of cancer; intermediate risk was noted when the patient had only one of poor prognostic factors (PSA ≥20 ng/ml or biopsy Gleason score≥7 or presence of cancer invasion to the seminal vesicle) and high risk patients had 2 or 3 poor prognostic factors. For patients of low, intermediate and high risk the biochemical reccurence rates were 14.3 %, 37.1 % and 70.2 %, respectively (p=0.002). The patients of intermediate and high risk had clinically significant higher risk of biochemical reccurence than those of low risk with odds ratio 3.0 and 8.5, respectively. Such grouping may help in guiding the individualized treatment for these patients.
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