Histomorphometric parameters of parathyroid glands after 60 days of sodium benzoate administration

The aim of this work is to study the effect of 60-day sodium benzoate administration on the histomorphometric parameters of the parathyroid gland in rat

Ultrastructure of tibia regenerate in rats after 60-day administration of sodium benzoate and justification of sodium selenite effectiveness

The aim of this work is to study the effectiveness of sodium selenite as a corrector of untoward changes in bone regenerate ultrastructure caused by the 60-day sodium benzoate administratio

The effect of 60-day administration of sodium benzoate and mexidol on the ultrastructure of the regenerate formed in the rat's tibiae

The aim was to study the possibility of correction of changes in the ultrastructure of the rat's tibiae regenerate caused by 60-day administration of sodium benzoate with mexidol by using the X-ray diffraction analysi

The Kola Peninsula: Geography, History and Resources

The Kola Peninsula in northwest Russia is one of the most important economic regions in the circumpolar North. The region contains valuable natural resources, including a wide variety of mineral and fish resources, and is proximate to the large gas fields of the Barents Sea. A large population, industrial complexes, and military infrastructure are also characteristic of the region. The Kola Peninsula developed rapidly during the Soviet period (1917-92) under the principles of socialist development policy. This policy favoured extensive resource extraction and industrialization and resulted in increased northern settlement, much of it involuntary. Soviet development policy prompted the opening of new mines and the construction of smelters and refining facilities, while Soviet military policy necessitated the establishment of large military basing operations. Resource development and processing have led to severe environmental damage in the region and beyond. This paper describes the geographical features of the Kola Peninsula and the region's development history and contains data on natural and labour resources.Key words: Kola Peninsula, Murmansk Region, Murmansk, Russian Arctic, Soviet Arctic, natural resources, economic development, militarizationLa presqu'île de Kola dans le nord-ouest de la Russie est l'une des plus importantes zones économiques du Grand Nord circumpolaire. La région contient de précieuses ressources naturelles, y compris une grande variété de ressources minières et de poisson, et elle est proche des champs gaziers de la mer de Barents. Cette région se caractérise aussi par une forte population, ainsi que par la présence de complexes industriels et d'une infrastructure militaire. La presqu'île de Kola s'est développée rapidement au cours de l'ère soviétique (1917-1992), selon les principes des politiques socialistes de développement. Ces dernières, qui mettaient l'accent sur une intensification de l'exploitation des ressources et de l'industrialisation, ont accru la colonisation - en grande partie forcée - dans le Nord. Les politiques soviétiques de développement ont amené l'ouverture de nouvelles mines et la construction de fours de fusion et de raffineries, tandis que les politiques militaires soviétiques ont rendu nécessaire l'édification d'importantes installations pour des bases militaires. L'exploitation et le traitement des ressources ont causé dans la région immédiate et au-delà de sérieux dommages écologiques. Cet article décrit les caractéristiques géographiques de la presqu'île de Kola et l'histoire du développement de la région, et il présente des données sur les ressources naturelles et en main-d'oeuvre.Mots clés : presqu’île de Kola, région de Mourmansk. Mourmansk, Arctique russe, Arctique sovibtique, ressources naturelles, développement économique, militarisatio

Influence of palm oil enriched diet on the morphofunctional condition of rats mandibular condylar cartilage

The aim of the study was to establish the morpho-functional condition of mandibular condylar cartilage in white rats of different ages under conditions of excessive use of palm oil and to assess the possibility of correcting the identified changes using the Garcinia Cambogia extrac

Microstructure and residual stress evolution during cyclic elastoplastic deformation of AISI316L fabricated via laser powder bed fusion

In metal additive manufacturing (MAM), microstructural properties such as texture, residual stresses, and dislocation density have emerged as key factors ruling the resulting mechanical performances. In this study, cylindrical AISI 316L specimens, fabricated with laser powder bed fusion (LPBF), were tested under cyclic elastoplastic (EP) deformation using a constant strain amplitude to highlight the evolution of residual stresses (RS), dislocation density and texture with increasing number of EP cycles, N, across the hardening-softening (H–S) transition stage, in the attempt to find correlations between relevant microstructural parameters and macroscopic properties. The structural and microstructural analysis is carried out through whole powder pattern modeling (WPPM) of neutron diffraction (ND) data and Electron Back-Scattering Diffraction (EBSD) analysis. The H–S transition is found to occur within 7–9 cycles, with RS fading out already after 5 cycles. Across the H–S transition, the trend of the maximum tensile stress correlates closely with the trend of WPPM-calculated total dislocation density, suggesting a major role of dislocations’ characteristics in the evolution of macroscopic mechanical properties. EBSD analysis reveals the rearrangement of geometrically necessary dislocations (GND) into cellular structures, and moderate grain refinement, which are deemed to be responsible for the quick fading of RS in the very early stage of EP loading. ND-based texture analysis reveals a (220) preferential orientation retained throughout the EP tests but with orientation density functions (ODFs) changing non-monotonically with N, suggesting preliminary partial randomization of grains around the deformation axis followed by the recovery of crystallographic anisotropy and more localized ODFs

The influence of constitutive material models on accumulated plastic strain in finite element weld analyses

Recent studies in computational weld mechanics have revealed the importance of the material plasticity model when predicting weld residual stresses. The present work seeks to extend this level of understanding to include the effects of the assumed material annealing behaviour, particularly when modelling multi-pass welds that comprise several thermo-mechanical loading cycles. A series of numerical analyses are performed to examine the variability in predicted residual stress profiles for different material models, using a validated finite element model for a three-pass slot weld in AISI 316LN austenitic steel. The material models consider both the work hardening and annealing assumptions for the chosen material. Model sensitivity is established not only from a weld residual stress perspective, but also from an assessment of the post-weld plastic strain accumulated in the weldment. Predictions are compared with indirect measurements acquired using cross-weld micro-hardness maps taken from benchmark specimens. Sensitivity studies reveal that the choice of annealing behaviour will have a significant impact on plastic flow predictions, which is dependent on the annealing temperature specified. Annealing assumptions will have a varying impact on the weld residual stress predictions, such that the extent of sensitivity is dependent on the plasticity model chosen. In contrast, the choice of plasticity model will have a significant effect on the predicted weld residual stresses, but relatively little effect on predictions of equivalent plastic strain