Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones

Color-induced changes in stones due to heating can be useful in determining the degree of degradation generated in their components and structure. We evaluate the effect of heating in three types of limestones, useful in building and restoration, corresponding to biomicrite (BC), biosparite (BS), and intramicrite (IM), in the range of temperature from 100°C to 600°C. Our analyses indicate that the strongest changes in reflectance occur in the samples of intramicrite, followed by biomicrite, being biosparite showing the smallest ones. Additionally, IM samples suffer the largest modifications in effective porosity due to the thermal treatment; in contrast, BS and BC samples show smaller temperature-induced alterations associated with smaller changes in reflectance. Moreover, we reveal that most of the thermally induced variations are associated, in this range of temperature, to the dehydroxylation of goethite that transforms into hematite, as well as by the burning and partial release of the organic matter present in the rock. Colorimetry analyses show that the sequence of thermally induced changes can be followed by the evolution of the three coordinates, L ∗ (lightness), a ∗ (red-green), and b ∗ (yellow-blue), of the CIE 1976 L ∗ a ∗ b ∗ space.

Destruction of Chitosan and Its Complexes with Cobalt(II) and Copper(II) Tetrasulphophthalocyanines

Chitosan is a naturally occurring polysaccharide derived from chitin with a wide range of uses. Phthalocyanines are macroheterocyclic compounds that have a number of useful properties such as coloring and catalytic and antioxidant activity. Phthalocyanines are able to immobilize on chitosan, forming complexes with new useful properties. In this work, we evaluated the ability of phthalocyanines to increase the thermal stability of chitosan. Chitosan (CS) forms complexes with copper(II)-(CuPc) and cobalt(II)-(CoPc) tetrasulphophthalocyanines. The processes of destruction of chitosan (CS) and its complexes with sulphophthalocyanines CuPc and CoPc in oxidizing and inert atmospheres have been studied. It was established that, regardless of the atmosphere composition, the first chemical reactions taking place in the studied systems are elimination reactions. The latter ones in the case of chitosan and complex CS-CuPc lead to the formation of spatially crosslinked polymer structures, and it causes the release of CuPc from the polymer complex. It was found that in the case of CS-CoPc elimination reactions did not lead to the formation of crosslinked polymer structures but caused the destruction of the pyranose rings with a partial release of CoPc. Metallophthalocyanines showed antioxidant properties in the composition of complexes with chitosan, increasing the temperature of the beginning of glycosidic bond cleavage reaction by 30–35 °C in comparison with the similar characteristics for chitosan.

STREAMER MODE OF POSITIVE CORONA

One cycle of quasi-periodic streamer mode of positive corona at constant voltage is considered. The calculation results for the streamer propagation at a voltage near to threshold of the streamer mode and for the stage of partial release of the gap from the ions are presented. The simplified model of ionization development near the anode before the start of the next streamer is considered and it is estimated the ionized space size, from which the streamer propagation begins.

Regulatory Mechanisms Underlying the Differentiation of Neotenic Reproductives in Termites: Partial Release From Arrested Development

Eusocial insects exhibit reproductive division of labor, in which only a part of colony members differentiates into reproductives. In termite colonies, the division of labors is performed among multiple types of individuals (i.e., castes), such as reproductives, workers, and soldiers to organize their society. Caste differentiation occurs according to extrinsic factors, such as social interactions, leading to developmental modifications during postembryonic development, and consequently, the caste ratio in a colony is appropriately coordinated. In particular, when the current reproductives die or become senescent, some immature individuals molt into supplementary reproductives, also known as “neotenics,” that take over the reproductive task in their natal colony. Neotenics exhibit variety of larval features, such as winglessness, and thus, immature individuals are suggested to differentiate by a partial release from arrested development, particularly in the reproductive organs. These neotenic features, which have long been assumed to develop via heterochronic regulation, provide us opportunities to understand the developmental mechanisms and evolutionary origin of the novel caste. This article overviews the accumulated data on the physiological and developmental mechanisms that regulate the neotenic differentiation in termites. Furthermore, the evolutionary trajectories leading to neotenic differentiation are discussed, namely the acquisition of a regulatory mechanism that enable the partial release from a developmentally arrested state.

Transient release of radioactive iodine from the fission of UF4 in 2LiF–BeF2 salt

The reaction between hot atoms of fission product iodine causes its partial release and is affected by the redox condition of FLiBe salt.

NOVEL TECHNIQUES FOR DIFFICULT AIRWAY MANAGEMENT IN VARIOUS CLINICAL SCENARIOS: CASE SERIES AND REVIEW OF LITERATURE

Difficult airway management has till date been the most fearsome and challenging part of any anaesthetic management. Meticulous planning is always done prior to anaesthetic induction of such patients with multiple back up plans and rescue strategy. Significant advancements in terms of clinical protocols, techniques, and devices / gadgets in this field have led to decreased incidence of airway related complications. We hereby present a case series of 3 clinical cases with different airway scenarios; 1) Patient with huge goiter, who was intubated with the help of an indigenously developed fish mouth valve device, 2) a temporomandibular joint ankylosis case, managed with awake fibreoptic guided intubation 3) Patient with post burn contracture of face and neck, in which fibreoptic intubation was performed after partial release of scar under tumescent anaesthesia. Extensive preoperative airway evaluation and preparation to handle any emergency by multiple backup plans always helps in smooth sailing through these difficult clinical scenarios

SPECTROSCOPIC METHODS TO DETERMINATION OF GEOTHITE IN KAOLINITE

One of the main contaminants of kaolinite, the iron, directly impacts quality in its commercial value. The spectroscopic monitoring, measured the depth of absorption of kaolinite, is compared with the literature in order to identify possible contaminants. The occurrence of kaolinite is due to the formation of primary minerals after the partial release of cations and silicon. This clay-mineral has a simple shape, with variable crystallographic imperfections, especially in the presence of iron, which replaces aluminum in the mineral chain, causing various structural disorganizations. The extraction of industrial minerals combined with geological studies, allows the development of new sources of energy, such as clay minerals, in particular kaolinite. Depending on the origin of the kaolinites, the presence of iron oxides in its structure, Fe2O3 and FeO(OH), are common. By comparing the results of spectroscopy (X-ray fluorescence, X-ray diffraction, RAMAN) and imaging using SEM-EDS, it was possible to identify kaolinite, with a higher determination coefficient, when the proportion of kaolinite reaches 60% or more in the mix. Kaolinite can be identified and quantified with a high correlation in the mixture from the sample absorption. Thus, the method has great potential to assist in quantifying and, consequently, in discriminating the quality of kaolinite.

HISTORY OF ESTABLISHMENT AND DEVELOPMENT OF THE AMNESTY INSTITUTE IN UKRAINIAN LAND

The study deals with the peculiarities of the application and the main periods of formation of the institution of amnesty in the Ukrainian lands. It is noted that in the classical modern sense, amnesty is mostly considered an act of full or partial release from criminal liability and punishment of certain categories of persons guilty of crimes and emphasizes the differences between this term and the concept of “pardon” for specific persons. It is noted that, contrary to the view that amnesty is a common practice in the post-Soviet space, it has been used since ancient times, such as in Athens and Rome (when “full forgiveness and forgetfulness” was used against Roman citizens, and by higher authorities on specific wrongdoings). actions that were considered crimes and those who committed them), and in modern conditions amnesty is applied in some Western European countries (Italy, etc.). It is pointed out that elements of amnesty have been found in Ukrainian lands since the times of Kievan Rus, and later in Ukrainian lands as part of the Polish-Lithuanian Commonwealth and the Russian Empire. It is noted that by the twentieth century. In Ukrainian lands, there was no separate institution of amnesty in the legislation, amnesty was considered an element of pardon and was not separate. The article notes that there are different views on the periodization of the formation and development of the amnesty institution in Ukraine in particular, and criminal science and law in general, and suggests that the periodization may not coincide with the existence of different state systems in Ukraine, as it should be based on scientific opinions and their implementation in regulations in force in the Ukrainian lands. The article emphasizes that during the period of independent Ukraine there is an active process of change and development of the national legal system in general and the institution of amnesty in particular.