A study of the stored energy in titanium under deformation and failure using infrared data

The work is devoted to the experimental study of heat dissipation caused by plastic deformationand failure processes taking place in a titanium alloy Ti-4.2Al-1.6Mn. To investigate the spatial and timeevolution of temperature, a set of experiments has been carried out on plane titanium smooth specimens andspecimens with pre-grown centered fatigue cracks. The original mathematical algorithm for experimental dataprocessing has been applied to obtain the rate of heat dissipation generated by plastic deformation and storedenergy. It is shown that the stored energy is accumulated in titanium specimens undergoing fatigue tests, and atthe time of damage to fracture transition it is equal to zero

Infrared thermography study of the fatigue crack propagation

The work is devoted to the experimental study of heat dissipation process caused by fatigue crack propagation. To investigate a spatial and time temperature evolution at the crack tip set of experiments was carried out using specimens with pre-grown centered fatigue crack. An original mathematical algorithm for experimental data treatment was developed to obtain a power of heat source caused by plastic deformation at crack tip. The algorithm includes spatial-time filtration and relative motion compensation procedures. Based on the results of mathematical data treatment, we proposed a way to estimate the values of J-integral and stress intensity factor for cracks with pronounced the plastic zone

Infrared thermography study of the fatigue crack propagation

The work is devoted to the experimental study of heat dissipation process caused by fatigue crack propagation. To investigate a spatial and time temperature evolution at the crack tip set of experiments was carried out using specimens with pre-grown centered fatigue crack. An original mathematical algorithm for experimental data treatment was developed to obtain a power of heat source caused by plastic deformation at crack tip. The algorithm includes spatial-time filtration and relative motion compensation procedures. Based on the results of mathematical data treatment, we proposed a way to estimate the values of J-integral and stress intensity factor for cracks with pronounced the plastic zone

CO oxidation activity of Pt/CeO2 catalysts below 0ºC: Platinum loading effects

Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO oxidation activity at sub-ambient temperatures is reported for Pt/CeO2 catalysts with high content of Pt in the form of dispersed Pt2+ and Pt4+ centers. Whereas the reference 1 wt%Pt catalyst was active for CO oxidation only above 100ᵒC, the 8 and 20 wt%Pt catalysts converted 60 and 90 % of CO, respectively, below 0ᵒC. Ionic platinum was shown to facilitate oxygen release from ceria and lower the light-off temperature of the reaction occurring through the Mars-van-Krevelen mechanism. However, the remarkable activity observed at sub-ambient temperatures for the ≥8 wt%Pt catalysts is proposed to involve O2 and CO reactants weakly adsorbed on PtOx clusters. The synergies between ionic platinum and nanostructured ceria reported in this work advance the knowledge-driven design of catalysts for low-temperature oxidation reactions

The stable fly

The paper provides literature review on the relationship among climatic conditions, ecological characteristics of the stable fly (Stomoxys calcitrans L.) and the observed spread of lumpy skin disease across the Russian Federation in 2015-2019. This study was carried out to gain an insight into a role of this potential vector in LSDV transmission. Data analysis shows that the flight activity of the stable fly mainly fits into the seasonal pattern of LSD outbreaks. However, there were outbreaks that occurred outside the period of the stable fly flight activity, pointing to other routes of transmission

VARIANTS OF NONSPECIFIC ULCERATIVE COLITIS COURSE IN CHILDREN: PREDICTION AND TREATMENT

Nonspecific ulcerative colitis has different masks, which make it hard for diagnostics. The course of the disease has many variants depending on the kind of therapy, its efficiency. prediction the course of the ulcerative colitis is very important to define the long term treatment management in order to increase the therapy efficiency and improve life quality.Key words: nonspecific ulcerative colitis, prediction the course of the disease, therapy, children

SORPTION РATHOGENETIC THERAPY OF ENDOGENOUS INTOXICATION OF PEDIATRIC CHRONIC INFLAMMATORY BOWEL DISEASES

Gut endotoxicosis caused by penetration of bacterial and metabolic toxins from chime on the background of increasing permeability of gut wall is of great importance in pathogenesis of chronic inflammatory bowel diseases (nonspecific ulcerative colitis — NUC and Crohn’s disease). It is accompanied by disturbance of regulating homeostasis system with the following disturbances of organs and systems of toxication. Developed endotoxicosis accordingly contributes to maintain and to progress of metabolic and immunological changes. To obtain the precise degree and phase of development of endotoxicosis we estimated quantitative and qualitative changes of metabolic status in accordance with content in erythrocytes, plasma and urine LMMWP (low and medium molecular weight peptides). Taking into concideration the peculiarities of children endotoxicosis with, we suggested patogenetical absorption therapy. Therefore, the therapeutic complex was added enterosorbent ensoral, which absorb eczo and endogenic toxins and, moreover, positive influence for composition of intestinal microflora. Prominent clinical effect was accompanied by positive dynamics of laboratory-instrumental parameters.Key words: endogenous intoxication, inflammatory bowel diseases, nonspecific ulcerative colitis, Crohn’s disease, low and medium molecular weight peptides, enterosorbents, children