Results of a study of the structure of porous carbon materials (PCMs) prepared by the carbonization of plant raw materials and the modification of oxidized or thermally expanded graphite have been ...described. It has been experimentally found that the studied materials have a porous fractal structure with an average micropore radius of 17–37 Ǻ. Based on this finding and results of previous studies, it is reasonable to state that the studied materials can be effectively used as supercapacitor electrodes. Adsorption/desorption of vapors and an aqueous solution of ethyl alcohol has revealed that the resulting materials are not inferior to pharmaceutical activated carbon with respect to the studied parameter. At a temperature of 37°C, carbonized sunflower seed shells retain the adsorbate three times longer than activated carbon does; this feature makes it suitable for use in medical applications.
A sector field inductively coupled plasma mass spectrometry method for the determination of Ag, Al, As, Ba, Be, Cd, Co, Cr, Cs, Cu, Fe, Mn, Ni, Pb, Se, Sr, Tl, U, V and Zn in whole blood and urine ...was designed. Microwave-assisted digestion with concentrated nitric acid was used for blood samples. Urine samples were analyzed after 1/50 (v/v) dilution with 5% (v/v) nitric acid. For beryllium the necessity of medium resolution mode (R=4000) was shown. Method validation was performed using blood and urine reference materials and by analyzing of spiked samples. For the designed method relative standard deviation (RSD) for the concentration range 0.01–1.0μg/L was 5–10%. RSD did not exceed 3% when trace elements concentrations were above 1.0μg/L. Method detection limits (3σ): Ag 0.7ng/L, Al 16ng/L, As 3.4ng/L, Ba 0.02ng/L, Be 1.5ng/L, Cd 7.7ng/L, Co 1.0ng/L, Cr 2.8ng/L, Cs 9.8ng/L, Cu 27ng/L, Fe 1.1ng/L, Mn 1.8ng/L, Ni 17ng/L, Pb 13ng/L, Se 0.07ng/L, Sr 5.7ng/L, Tl 0.2ng/L, U 0.1ng/L, V 0.7ng/L and Zn 1.2ng/L.
A developed method was applied for trace element biomonitoring of occupationally exposed workers of a beryllium processing enterprise. For preliminary risk assessment technological surface dust had been analyzed by inductively coupled plasma optical emission spectrometry. Based upon results of 50 blood and 40 urine samples analyses occupational exposure evaluation was performed. Exposure risks were found not to exceed acceptable ranges. Possible health hazards were found for Be and also Al, Cr, Mn. Occupational health and safety recommendations for the biomonitored enterprise medical care unit were issued as a result of the current investigation.
•SF-ICP-MS method for assessment of 20 elements in blood and urine was designed.•Spectral interferences were found for 9Be in both matrices for low resolution.•Medium resolution effectively minimized interferences for Be.•A beryllium processing enterprise was monitored using the developed method.
The development of drilling waste recycling technologies is a crucial task, primarily due to their negative impact on the environment, the increasing need for state control over compliance with ...environmental legislation by oil production companies, and the absence of universal technological solutions for their recycling and neutralization. This article provides a brief overview of various methods to recycle drilling waste for the production of different materials. Using drilling waste located in the Tyumen region as an example, the study demonstrates the potential of incorporating them as additives in fine-grained concrete.
Abstract
The purchase of trade establishments is an important and complex process, on which companies spend a lot of resources in order to get the maximum benefit. There are many well-established ...methods for making a forecast of the required number of goods, but none of them can guarantee an accurate result, because in the matter of forecasting, there cannot be a method that produces a result with 100% accuracy. The object of our research is the process of creating a purchase forecast for trade enterprises. The subject is the analysis of the quality of the purchase forecast for retail outlets. To determine the quality of the purchase forecast of the retail outlets, it is necessary to understand how the purchasing process takes place, as well as highlight the factors that affect the forecast quality.
Background. Diabetes mellitus (DM) became a major problem of the healthcare in Ukraine. The rapid increase in the incidence was noticed especially in recent decade. The treatment of diabetes and its ...complications become a difficult task. From this standpoint the experimental modeling of diabetes is rather essential. Using the experimental models gives the possibility to assess the significance of the activity of pharmacological substances or to find out new mechanism in the action of medicaments. The aim of this review is to light up the most studied and common experimental models of diabetes mellitus type 2 (T2DM) in small rodents and find out their drawbacks. It is known the background of T2DM is the violation of the insulin homeostasis such as the resistance of peripheral tissues to insulin as well as the dysfunction of the pancreatic beta-cells, which both lead to appearance of such phenomena as the glucosetoxicity and the lipotoxicity. In the end they both could result in life threatening vascular complications. Considering the steady growth of T2DM patients, the development both of the drug and non-drug methods of its treatment with the high therapeutically efficiency and the perfect safety profile becomes essential. The most important stage of the search of new ways of influence on pathogenetic links of T2DM is the preclinical stage. From this standpoint the usage of experimental models of T2DM has a huge importance. There are a lot of models of T2DM developed by different scientists. These models could be spontaneous or be induced by different chemical diabetogenic substances, diet or surgical interventions or be a combination of methods listed above. Conclusions. We should underline the adequate modeling of DM2T is the necessary basis for the pre-clinical study of drug-based and not-drug methods of correction of the hyperglycemic states. Using different models makes it possible for infer the obtained experimental results to the society, which suffers from DM2T.
This work reports the main findings of the studies related to the problem of liquid radioactive waste utilization conducted at the Institute of Chemistry, Far Eastern Branch, Russian Academy of ...Sciences, in 2013–2018. It has been shown that, during the electrochemical treatment of model aqueous solutions containing Co-EDTA, the complex is destroyed and cobalt precipitates in the form of oxides, hydroxides, and spinel of variable compositions.
An optimized magnetic specification has been searched for a PM quadrupole constructed for the DC-140 cyclotron in JINR, Dubna. The field inhomogeneity should be reduced to come closer to an ideal ...distribution. The quad parameters should be determined with very high mechanical and magnetic precision in order to reach the specified gradient. Results of the analytic study based on a 2D model gave initial values for the PM blocks dimensions and orientations. To ensure stringent performance criteria, parametrized 2D and 3D models of the quad were built. These models were used to optimize the magnet configuration, analyze its sensitivity to various errors and derive parameter tolerances. Additional adjustment to suitable field quality is foreseen using results of a trajectory analysis and acceptance inspection. The design parameters for the best suited magnet configuration are presented and the performance criteria are defined. However, an electromagnetic analysis of the selected configuration has revealed that the relative field error adopted previously as the optimization criterion gives low accuracy estimate. Alternative estimations are proposed utilizing the field gradient error as the basic criterion to satisfy the constraint on the field inhomogeneity.
A new species of monstrilloid copepod, Monstrillopsis ferrarli n. sp., based on four adult female specimens collected in the White Sea, northern Russia, is described and illustrated. The new species ...is most closely related to M. dubia Scott from Scotland and the Mediterranean and M. dubia (sensu Sars, 1921) from Norwegian fjords. The latter is considered to represent a distinct species, described herein as M. dubioides n. sp. It differs from M. dubia in characters related to antennule length compared to body length, but mainly to the shape and relative size of the genital double somite and other urosomal somites. Records of M. dubia in Norway and off Lisbon are referable to M. dubioides n. sp. On the other hand, M. ferrarli n. sp. differs from M. dubia, M. dubioides, and the other species of the genus by a combination of characters, including 1) two rounded protuberances in the cephalic area, flanking the ocelli; 2) a wide zone of transverse cuticular striations encircling the cephalic area; 3) very long exopodal setae on the fifth legs, with no distal elongation of the exopodal lobe beyond the setal bases; 4) a relatively long genital double somite with the margins of the anterior half produced laterally; and 5) the nearly equal sizes of the anal somite and the preceding somite. It is considered that M. dubia and related forms represent a species complex with subtle morphological differences and a wide distribution. This is the first record of a species of Monstrillopsis in Russia and the sixth species of this order to be recorded in polar environments. /// On décrit et illustre une nouvelle espèce de copépode de la famille des monstrillidés, Monstrillopsis ferrarli n. sp., établie d'après quatre spécimens femelles adultes prélevés dans la mer Blanche (Russie septentrionale). Cette nouvelle espèce est très proche de M. dubia Scott qui vit au large de l'Ecosse et en Méditerranée, et de M. dubia (sensu Sars, 1921) présente dans les fjords norvégiens. On considère que cette dernière représente une espèce distincte, décrite ici sous le nom de M. dubioides n. sp. Elle se différencie de M. dubia par certains éléments liés à la longueur de l'antennule par rapport à la longueur corporelle, mais surtout par la forme et la taille relative du double somite génital et d'autres segments de l'urosomite. Les observations de M. dubia en Norvège et au large de Lisbonne portent en fait sur M. dubioides n. sp. D'un autre côté, M. ferrarli n. sp. se différencie de M. dubia, M. dubioides et des autres espèces appartenant à ce genre par une combinaison de caractéristiques qui comprennent: 1) deux protubérances arrondies dans la zone céphalique, situées de part et d'autre des ocelles; 2) une large zone de stries cuticulaires transversales entourant la partie céphalique; 3) de très longues soies exopoditiques sur la cinquième paire de pattes, sans elongation distale du lobe de l'exopodite au-delà de la partie basilaire des soies; 4) un double somite génital relativement long dont les bords de la moitié antérieure se développent latéralement; et 5) une taille presque similaire du somite anal et du somite qui le précède. On considère que M. dubia et les formes apparentées représentent une espèce complexe qui témoigne de différences morphologiques subtiles et d'une large distribution. Il s'agit là de la première observation de Monstrillopsis en Russie et de la sixième espèce de cet ordre à être observée dans un environnement polaire.
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