bluuebunny/crossref_metadata_2025 huggingface dataset:
NEW AQUEOUS POLYMER FOR HIGH-TEMPERATURE RESERVOIRS
Authors: SAVINYKH Y. V. , LANG L. D.
Published: August 2021

Polymer flooding is technologically simple and highly effective method of enhanced oil recovery. The method is based on adding a small amount of polymer in conventional water flooding of oil reservoirs. The increase in viscosity and the reduction of the mobility of injected water are to equalize the displacement front by slowing the moving of water in the highly permeable zones and restricting the formation of water finger. These factors help to increase the sweep efficiency and oil-water displacement efficiency during flooding. Polymer flooding has been used successfully in clastic and carbonate reservoirs, as well as in low-permeability reservoirs such as a fractured basement. However, most of the current polymer gel used for control water flows are decayed by a high content of ions Ca2+ and Mg2+ in formation water or in injected water. Similarly, polymer gels lose their stability at high reservoir temperature (above 70°C). Developing water-soluble polymer, which does not change their rheological properties under high salinity and high temperature (over 100°C), is very important when producing offshore, where sea water is commonly used for flooding (high salinity of 30-40 g/L).
FACTORS GENERATORS OF MOTIVATION AND DEMOTIVATION IN THE UNDERGRADUATES OF CHEMISTRY OF A PUBLIC UNIVERSITY IN THE BRAZILIAN NORTHEAST
Authors: JULIAO M. S. S. , DA COSTA I. C. A. , BEZERRA A. C. S.
Published: August 2021

The study of motivation and demotivation in the educational field has contributed greatly in the process of teaching and learning, identifying the points that require attention and study by the family, schools, teachers and students. An approach that studies this continuum is the Theory of Self-Determination, which together with the Academic Motivation Scale understands that men are moved by the satisfaction of basic needs. The importance of this issue has generated interest in developing this work that aims to identify and analyze the factors that motivate and demotivate students during graduation and measure the degree of motivation and demotivation. The survey was conducted through a questionnaire administered to 165 (50%) of the students enrolled in the Bachelor's Degree in Chemistry in the first half of 2017. From the analysis of students' responses, they feel motivated especially by free education and achievement of a diploma. The most cited demotivation factors are: precariousness of the transportation means to the university, influences of self-charging and family pressure. With the results we can say that despite the negatives, students consider themselves motivated to seek development and improvements to their professional and personal.
MINIMIZING MISCONCEPTION OF IONIZATION ENERGY THROUGH THREE-TIER DIAGNOSTIC TEST
Authors: SUPRAPTO N. , ABIDAH A. , DWININGSIH K. , JAUHARIYAH M. N. R. , SAPUTRA A.
Published: August 2021

Research about conception and misconception of specific topics in science education is still sightseen among researchers. Ionization energy is one concept that possible generate mis(understanding) for students. Therefore, this study aimed to investigate the understanding of ionization energy among high school students. Totally, 118 students from East Java-Indonesia were invited to an online-Ionization Energy Diagnostic*Modification (IEDI*M) test through survey study. IEDI*M consisted of 12 multiple choices with three-tier items. The findings mapped the main misconceptions of ionization energy, especially for Group 1, Group 2, Period 2, and Period 3 established on the periodic system. By using three-tier tests, the percentages of misconceptions decreased from one-tier to two-tier and from two-tier to three-tier levels.
USING ANDROID-BASED EQUATION PLOTTERS AS SUPPORTING TOOLS FOR TEACHING AND LEARNING ATOMIC ORBITALS
Authors: TANIA L. , A. SAPUTRA
Published: August 2021

Chemistry undergraduate students are required to master the theory of quantum mechanics as the basic requirement to study the properties of the submicroscopic particle. However, many studies showed the students’ difficulties to bring the quantum mechanical concept to the macroscopic world and vise-versa. The use of computer visualization tool will very useful for teaching and learning the quantum concept, especially electron and its related atomic orbitals. This technological report paper demonstrates some of the Android-based applications i.e FuncXY, TriPlot 3D Graphing, and Graphing calculator to effectively, quickly, and accurately convert wave functions into various hydrogen atomic orbital visualizations. By selecting spherical coordinate and entering wave equation, these smartphone graphical devices visualize three-dimensional atomic orbitals. Users are also easy to rotate, zoom and manipulate the object. Finally, these user-friendly plotters are very recommended to assist chemistry educators in teaching quantum mechanics.
CHIA SEEDS (Salvia hispanica L.) AS AN AGENT IN THE PREVENTION, TREATMENT AND CONTROL OF SOME CHRONIC DISEASES: A REVIEW
Authors: NASCIMENTO S. S. do , ANDRADE JUNIOR F. P. de , ALVES T. W. B. , MENEZES M. E. S.
Published: August 2021

The seed of Chia (Salvia hispanica L.), originating in Mexico, is included in the cereals group, is considered a functional food. Its physicochemical composition and nutritional properties make it a significant source of fiber, carbohydrates, proteins, minerals, essential amino acids, antioxidants and is rich in polyunsaturated fatty acids (PUFAs). The objective of this study was to gather information that relates Chia seed composition to the prevention, treatment and control of some pathologies, such as obesity, dyslipidemia, cardiovascular disease and diabetes. This review study used the databases Medline/Pubmed, Lilacs, Scielo, a bibliographic collection of the Federal University of Campina Grande and materials from the national and international health committees, from articles published in the last 20 years. Sixty references were found, of which 43 were included in this study, excluding only those that did not have relevant aspects of the proposed theme. Therefore, when adding Chia seeds to the diet, it is possible to notice an improvement in parameters such as blood pressure (BP), lipid profile, glycemic index (GI), increased satiety sensation and delayed gastric emptying, which are direct indicators of these diseases And consequently the quality of life. Thus, Chia seed is only an auxiliary, and healthy living habits are also necessary.
ANÁLISE DE ESTRUTURA CRISTALINA E SUPERFÍCIE HIRSHFELD DE UMA COORDENAÇÃO UNI-DIMENSIONAL HÍBRIDA ORGÂNICA/INORGANICA [(MoO3)(biim)]n
Authors: MORALES Z. , ATENCIO R. , RAMOS M. A. , BRUNO-COLMENÁREZ J.
Published: August 2021

A new one-dimensional organic/inorganic hybrid [(MoO3)(biim)]n has been synthesized by a hydrothermal method in a reactor Parr. Its structure was characterized by FT-IR spectroscopic studies and single-crystal X-ray diffraction. This compound crystallize in the orthorhombic system with space group Cmc21, Z = 4, and unit cell parameters a = 6.9834(4) Å, b = 9.8771(6) Å, c = 13.6740(8) Å, and β = 103.861(1)º, V=1026.64(18) Å3. The molecular structure and crystal packing are stabilized mainly by a strong intermolecular hydrogen bonds with atoms N–H•••O which can be described by graph set symbol R22(9) and its packing arrangement reinforced by π - π stacking. The intercontacts in the crystal structure are analyzed using Hirshfeld surfaces computational method.div>
DEFORMATIONS OF ALUMINUM ALLOYS UNDER THE INFLUENCE OF AN ADDITIONAL LOAD
Authors: SKVORTSOV Arkady A. , PSHONKIN Danila E. , LUK YANOV Mikhail N. Margarita R.
Published: August 2021

Under the influence of a constant magnetic processes in the future lead to destruction. Therefore, the authors investigated these processes in more detail. When studying the creep of the samples, a lever temperature) simultaneously with the application of the load (carried out by steps), an elongation of the sample was recorded with a micrometer (division price 10 load during the measurement, as well as smoo it is found that creeping increases under stable magnetic field; the main features appear at the first creep stage. Thus, preliminary exposure of samples in a constant magnetic field (with induc room temperature) leads to an increase in the absolute deformation of the aluminum alloy to 35%. The material deformation constants are also determined under " constant at the first stage of creep was found to be more than 6 times. Investigation of these processes will help to predict time dependence of creep strain and its rate as well as durability and plasticity at destruction.
EXTRACTION, CHEMICAL CHARACTERIZATION AND ANTIMICROBIAL POTENCY OF ESSENTIAL OIL OF TAHITI LEMON (Citrus latifolia Tanaka)
Authors: EVERTON G. O. , TELES A. M. , MOUCHREK A. N. , MOUCHREK FILHO V. E.
Published: August 2021

The increase in bacterial resistance to antibiotics induce the emergence of more virulent strains, with ability to cross natural barriers of defense of the organism and of becoming pathogenic, even when present in low numbers. Therefore, the use of natural compounds such as essential oils, which have a strong bactericidal property against food pathogens has been widely explored. In this way, the focus study aimed to extract, chemically characterize and evaluate the antimicrobial potential of essential oil from Citrus latifolia Tanaka (tahiti lemon) against the strains of Escherichia coli and Staphylococcus aureus. For extraction of essential oil, we used the hydrodistillation technique, chemical characterisation by Gas Chromatography coupled to Mass Spectrometry (GC/MS) and the antimicrobial potential was evaluated by the Disk Diffusion Method (DDM). It was observed for this oil yield (1,64%), the CG-MS quantified the limonene dioxide (25,93%) as major component and all bacteria were sensitive front of the oil. Therefore, it has the potential of antimicrobial essential oil from Citrus latifolia Tanaka (Tahiti lemon) pointing the same as an ally in applications which depend on the inhibition of microorganisms tested in this study.
CHARACTERISATION OF VOLATILE AND SEMI-VOLATILE COMPOUNDS OF OILS FROM Solanum lycocarpum FRUITS BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY
Authors: SILVA V. C. B. , SIQUEIRA E. P. de , ALVES S. N. , LIMA L. A. R. S.
Published: August 2021

Oils were obtained from unripe and ripe fruits of Solanum lycocarpum. In this study, the volatile and semi-volatile compounds of oils were characterized by gas chromatography-mass spectrometry (GC-MS). Oil of unripe fruits (OUF) of S. lycocarpum exhibited principally fatty acids, esters, hydrocarbons and sterols. However, oil of ripe fruits (ORF) presented the major compounds esters and sterols. In OUF-7, the predominant compound was octadecanoic acid (73.37%), in ORF-2, octadecanoic acid octadecyl ester (59.30%) and in ORF-3, hexadecanoic acid hexadecyl ester (97.98%). Sitosterol, identified in OUF-2 and OUF-6, is predominant sterol found in various species of Solanum can have chemotaxonomy importance for this genus. This is the first time, to the best of our knowledge, that volatile and semi-volatile compounds of oils from S. lycocarpum fruits have been characterized.
CONSTRUCTION OF SOME NOVEL BIOCIDAL N-ALKYLATED QUINAZOLINE-4(3H)- ONE DERIVATIVES USING MICROWAVE ACTIVATION
Authors: EL-BADRY Y. A. , ABDOU S. N.
Published: August 2021

Microwave-assisted construction of 2-propylquinazolinone1 has been achieved, followed by its subsequent utilities in constructing an attractive series of 2,3-disubstituted functional quinazolinones 2-10. The use of microwave irradiation in performing N-alkylation for the titled quinazolinone 1 was applied as a simple, efficient and eco-friendly green technique. Furthermore, the in vitro antimicrobial screening of the obtained compounds 3-10 has been investigated against four bacterial strains and two fungal strains. The structure of the synthesized molecules was affirmed using analytical and spectral tools.
MOBILITY OF FLUMIOXAZIN IN ARGISOL AT SOUTHERN AMAZON
Authors: YAMASHITA O. M. , CARVALHO R. V. , CARVALHO M. A. C. , TIEPPO R. C. , DALLACORT R.
Published: August 2021

The objective of the present work was to determine the mobility of flumioxazin in Argisol, as a function of two pluviometric indices, as well as possible influences of the chemical and physical properties, on the action of the herbicide. 32 PVC tubes were used (10 cm in diameter by 50 cm in height). These containers were completely filled with the Argisol collected in the arable layer of an area where there was no herbicide application. Once the flumioxazin (50 g i.a. in 200 L/ha) was applied, the treatments were applied. Then, rainfall of 10 mm per day was simulated to reach the desired levels of rainfall (40 and 80 mm), so that the tubes were dismantled and 5 sorghum seeds (Sorghum bicolor) were seeded each depth (2.5; 5; 10; 15 and 30 cm) in the profile of the tubes. These were maintained for 15 days under field conditions to carry out the initial evaluation. Height, dry matter, and phytointoxication were evaluated to analyze possible changes that could be characterized as herbicide effects. Under experimental conditions, flumioxazin was sparingly mobile, remaining in the superficial layer (2.5 cm).
OST WATER VOLUME IN WATER SUPPLY SYSTEM, IN NORTH AND CENTRAL WEST REGION
Authors: SANTOS A. B. dos , DIAS É. C. , SILVA G. P. C. da , RIBEIRO R. P. , SILVA A. M.
Published: August 2021

Due to the events of the last years, when, mainly the Southeast region of Brazil has experienced one of the worst periods of water shortage, there has been a process of national awareness for the need of care with the quality and quantity of water. Therefore, currently in the national and world scenario is seeking to minimize the waste of water, acting mainly in the water supply systems, which have the highest loss rates of this liquid. In this way, the objective is to determine the volume of water (1000m³/year) wasted in SAA (Water Supply System), based on the amount of water produced and consumed in the North and Central-West region of Brazil and, from this, compare the losses in those regions, for the year 2015. Based on the analysis of the datas, it was verified that the water supply in the North and Central-West regions presented high losses rates, 43% and 37%, respectively. Actions such as maintenance of sanitary fittings and elimination of leaks in the residence, more efficient operation and maintenance of the system and improvement in the commercial management of service providers, are measures to combat and reduce water losses.
MEMBRANE TECHNOLOGY FOR THE TREATMENT OF FISH INDUSTRY EFFLUENT
Authors: PONSANO E. H. G. , PIRES H. A. , OLIVEIRA D. L. , GARCIA A. F.
Published: August 2021

Membrane filtration emerges as an alternative for the treatment of fish processing effluent. The aim of this work was to verify the ability of membrane filtration on reducing the pollutant load of tilapia processing effluent. The filtrations were performed with 150, 30 and 10 kDa membranes. The physicochemical parameters of the effluent in natura and the permeates were compared among themselves and with the standards for launching foreseen in the Brazilian legislation to evaluate the possibility of direct disposal in water bodies. The three membranes had the same potential to remove total solids, nitrogen and nitrite from the effluent. Membranes 30 and 10 kDa caused similar effects on the removal of Chemical Oxygen Demand and proteins. Oils and greases, pH and fixed solids did not change with the filtrations. All the membranes were effective in reducing the color of the effluent. The effluent in natura was already in agreement with the standards for discharge regarding to temperature, pH, total nitrogen and nitrite, and the use of the membranes allowed it to meet the standards for floating materials. The color and the content of oils and grease in permeates were above the levels allowed for the discharge in freshwater, so suggesting the use of an additional operation to comply with the legislation.
NEUROIDENTIFICATION WITH NEURO-SELF Tuning TO ENSURE THE OPERATION OF THE CURRENT LOOP OF THE ELECTRIC DRIVE WITH THE DESIRED STATIC ANDDYNAMIC CHARACTERISTICS
Authors: BUYANKIN V. M.
Published: August 2021

The synthesis of neural regulators for control systems of electric drives is considered in the article. The stable work and features of the application of neural regulators in closed circuits are analyzed. Neuroregulators self-adjust when changing the parameters of the control object. Information on the change in the parameters of the control object is compared with the optimal desired characteristics of the reference model, training signals are generated for the neuroregulators, which provide the necessary optimal static and dynamic characteristics of electric drive.
OPTIMIZATION AND VALIDATION OF SPE-HPLC-DAD-FLD METHOD FOR PSYCHOACTIVE DRUGS IN ENVIRONMENTAL MATRIX
Authors: SIMÃO L. A. , BOGER B. , DOMINGUES M. J. , PERALTA-ZAMORA G. P. , GOMES C. E. , WAGNER R.
Published: August 2021

Recently scientific community has turned its attention to the organic micropollutants such as pharmaceuticals and hormones, because the ecotoxicological effects of chronic exposure are uncertain. These substances are neither completely degraded nor monitored in sewage treatment, which makes the aquatic environment the main disseminant, due to the usual discharge of domestic and industrial sewage. Therefore, the current work aims to develop quantitative method using HPLC-UV-DAD-FLD detection in order to determine the psychoactive drugs fluoxetine and haloperidol, potential environmental contaminants in surface water. The solid phase extraction was performed to preconcentrate of the analytes of interest in aqueous matrices, in which it was evaluated univariate for reconstitution volume and pH, and via factorial planning 23 for the other variables. The best conditions were obtained by conditioning with 5 mL of acetonitrile and 5 mL of water pH 4.0, 100 mL of sample (pH 4.0), eluting with 5 mL of acetonitrile and reconstitution with 1 mL of water. The recovery rate was 73.7% and 87.2% for haloperidol and fluoxetine, respectively. The method was developed in real samples fortified with standards and real samples from three different points of the Belém river in Curitiba-PR.
SCIENTIFIC RESEARCH USING THE APPLICATION SOFTWARE PACKAGE MATLAB
Authors: PIROGOV S. P. , CHERENTSOV D. A.
Published: August 2021

The MATLAB application package accelerates the pace of learning, teaching, and research in engineering disciplines and science, helping to prepare students for a successful career in the industry because it is widely used for research and development. It has received a wide application in such industries as aerospace, automotive, communication, and industrial automation. The concept of model-oriented design is based on the modeling of high-level systems. This allows us to develop a model based on technical tasks and specifications, to design systems using simulation modeling, to automatically generate code, and also test and verify models at stages from project to implementation. Thus, teachers get the opportunity to educate students about the understanding of the system components physics, their interaction and the behavior of systems in general, and all this in a unified environment. In the paper, the main advantages, interfaces of MATLAB application programs are presented. The results of scientific research of authors using MATLAB - investigation of natural frequencies and damping parameters of gauge tubular springs in the viscous medium as well as torsional oscillations of the pump unit shafts are presented. The effect of the geometric characteristics of gauge tubular springs on the natural frequencies of oscillations and attenuation parameters is investigated. Using the MATLAB package, a technique has been developed for calculating the stresses associated with the torsion of the pumping unit shafts.
THE USE OF VIRTUAL LABORATORY WORKS IN THE STUDY OF ENGINEERING DISCIPLINES OF OIL AND GAS TRAINING
Authors: SYZRANTSEV V. N. , CHELOMBITKO S. I. , GAMMER M. D.
Published: August 2021

The effect from the introduction of an interactive form of learning in the study of engineering disciplines is examined, as well as factors that decrease the effectiveness of the results of using modern computer training aids (simulators). Virtual laboratory works are described that are used at the department "Machines and equipment of the oil and gas industry" of the Industrial University of Tyumen in studying general engineering and special disciplines of the area "Oil and gas engineering", profile "Operation and maintenance of technological facilities of oil and gas production". Based on the experience of using simulators at the department, it was concluded that the greatest effect of achieving the required knowledge, abilities, and skills was obtained by using simulators in the form of virtual laboratory works.
MORPHOLOGY AND KINETICS OF PETROLEUM WAX DISSOLUTION IN HYDROCARBON SYSTEMS
Authors: IVANOVA I. K. , DIAKONOV A. A. , SEMENOV M. E. , KORYAKINA V. V.
Published: August 2021

This paper studies the effect of solvent chemical nature on the kinetic parameters of dissolution and the morphology of the petroleum waxes. The kinetics of the petroleum wax dissolution in gas condensate and the hexane-cyclohexane-benzene mixture was examined on the torsion balance within the temperature range from 10 to 40°C. The process was described using the Erofeev-Kolmogorov equation. The following kinetic parameters were calculated: reaction rate, the order of reactions and effective energy for activation the wax dissolution in the studied solvents. It was found that the wax dissolution rate in the ternary composite is an order of magnitude greater and the activation energy is three times less in comparison with the process of wax dissolution in the gas condensate. The morphological features of the wax samples, treated by these solvents, were examined by means of scanning electron microscopy. It was found that in the ternary composite, wax has a porous structure and in the gas condensate, it is compressed. Thus, the identified kinetic and morphological behavior of petroleum waxes indicates the influence of the chemical nature of the solvent. The findings of this study can be useful when choosing a solvent for the paraffin deposits removal.
RATIONALE FOR WATER SOIL WASHING TECHNOLOGIES BY GROWTH REGULATION
Authors: SIETKAZIEV A. S. , KULKAEVA L. A. , SHINYSHEROVA G. B.
Published: August 2021

When irrigation of land in the arid zone, one of the mandatory elements for maintaining the water-salt balance is soil washing. At present, washing standards are calculated and recommended for different soils. However, these calculations are based mainly on experimental data. To increase the efficiency of washing, and also to save irrigation water, it is necessary to investigate the mechanism of desalinization of the soil during washing. In this paper, we propose a method for calculating the rate and degree of desalination of soils based on the analysis of the motion of salt particles. The main calculation element is the velocity and range of the particle’s salt in solution. This method makes it possible to justify and determine the technology of clock leaching of saline soils. The paper presents the results of applying mathematic modeling methods to the example of the left-bank Tentek Irrigation Massif. The basis of the modeling was laid the basic equation of salt transfer with the calculation of the coefficients included in it according to the actual data. As a result, net wash rates were obtained for saline lands, depending on the physicochemical properties of the soils of the investigated massif.
BIOMARKERS AS A TOOL TO EVALUATE ENVIRONMENTAL QUALITY OF AQUATIC ECOSYSTEMS SUSCEPTIBLE TO PESTICIDE CONTAMINATION
Authors: SALVO L. M. , SANTIAGO M. R. , SILVA DE ASSIS H. C.
Published: August 2021

Biomarkers or biological markers are measurable biological responses of living organisms which can indicate the presence of environmental pollutants and, eventually, contamination levels. Usage and development of new environmental contamination biomarkers are increasingly widespread in biological monitoring and water resource management programs in developed countries. Recent studies indicate poor quality of water bodies as a result of pollution from agricultural effluents has increased considerably. Current practices in food production often result in the use of an indiscriminate mixture of classes of pollutants such as organochlorines, organophosphates, carbamates and pyrethroids, among others, which can produce serious impacts to the water environment. Some of these substances are bioaccumulative, that is, they tend to increase in concentration in upper trophic levels. Studies using multiple environmental contamination biomarkers are increasingly relevant. The present work aims to discuss and compare the use of chemical, biochemical and cellular environmental contamination biomarkers in continental freshwater fish species exposed to sublethal concentrations of various contaminants. Among the results, we can highlight a significant increase in the total concentration of CYP450 in carps (Cyprinus carpio) sublethally exposed to the endosulfan, and increased levels of EROD activity in armored catfish (Ancistrus multispinis) exposed to sublethal concentrations of deltamethrin.
NUMERICAL SIMULATION OF HEAT TRANSFER PROCESSES IN LINING AND OPTIMIZATION OF HEAT WORK OF THE UNIT
Authors: UNASPEKOV B. A. , BAZAROV R. , AUELBEKOV S. S. , IRGIBAEV T. I. , SEITKAZINOV O. D. , KYZYLBAEV N. K.
Published: August 2021

The features of heat and mass transfer inlining of high-temperature tunnel kiln for the burning of refractory materials are revealed by numerical simulation of heat transfer processes. Use of modern computer calculation programs permits to choose optimal constructions of trolley walls and heart lining. This ensures improved hermeticity of workspace and 15-20% reduction of heat loss. We studied the operation of a hightemperature of the unit with a combined system that ensured efficient burning of natural gas as well as regulation of temperature regime in the thermal aggregate workspace. A procedure was advanced to calculate consumption of fuel by gas burners and hot air over burning zone positions of high-temperature tunnel kilns when using a combined system of natural gas burning. The heat work of a tunnel kiln was optimized. This permitted to supply maximal quantity of hot air and natural gas into the initial positions of burning zone of tunnel kiln and to ensure technologically required temperatures of products burning (1780-1800ºС).
EXPERIMENTAL RESEARCH OF CHARACTERISTICS OF CRUSHERS WITH CYCLOIDAL MOTION OF WORKING BODIES
Authors: RABAT O. Zh. , SALMANOVA A. N.
Published: August 2021

The use of different crushers to obtain the required size of the stone material. This work presents experimental studies of the characteristics of a crusher with a complex movement of working organs. The objectives of the study are, a sieve analysis of the obtained product (crushed stone) and the determination of the optimal speed of the working bodies (rolls) to obtain high-quality cubic shape crushed stone. In the experiment, the raw material is fed into the working space (into the crushing chamber) through the hopper and moves by a flat flow between the rollers. The edges of the rolls roll symmetrically from two sides to the flow of material, approaching in the area of the crushing zone and diverging in the region of the unloading zone. The authors determined the optimal rolls for obtaining high-quality cubiform crushed stone (over 80%). As a result, of the research, it was established that the grain composition of the fraction is within the standard of the Republic of Kazakhstan 1225-2003 t.3 – is obtained cubiform crushed stone, with an rotational speed of rolls of 100-120 rpm.
CHARACTERIZATION AND STUDY OF THE KINETICS OF SEDIMENTATION OF REJECT OF THE IRON ORE INDUSTRY
Authors: SANTOS J. H. M. , SANTOS P. C. M. , VIEIRA F. T. , FABRIS J. D. , REIS A. B. , SILVEIRA J. V. W. da
Published: August 2021

Currently the mining industry plays an important role in the generation of wealth of a country through the exploitation of natural resources of the earth, and in some cases, responsible for a significant fraction of the economic matrix. Like any other industrial activity, mining has a negative impact on the environment, which leads the industry to constantly face the challenge of achieving the sustainability of its activities. The study aimed to characterize the iron ore reject seeking the feasibility of reprocessing and water recovery. The reject sample was characterized using Scanning Electron Microscopy with Dispersive Energy Spectrometer. Studies of the sedimentation kinetics of the tailings were carried out to implement techniques to recover the iron present in the tailings and recycle water in the mineral processing. In the sedimentation tests it was possible to recover approximately 50% of water without compromising the transport operations of the material. It can be concluded that the ore reject analyzed is composed mainly of Fe and Si respectively, showing that the reject has reprocessing potential, and recovery of water present in the clarified.
ELECTRONIC POLARIZABILITIES OF DIHYDRATED URANYL ACETATE UO2(H3CCOO)2.2H2O IN AQUEOUS SOLUTION
Authors: LIMA F. J. S. , COSTA L. H. M. da , SILVA A. O. da
Published: August 2021

Electronic studies in molecular systems have been used to evaluate the possibility of improvements in the efficiency of physicochemical processes of interest in electronic devices. We have studied complex molecular systems prototypes in our research area, especially involved in intra- and intermolecular electron transfer. In this work, we performed the spectral recording of uranyl acetate dihydrate in aqueous solution to characterize its spectral properties, related to the deformation of the electronic configuration, against the incidence of uv-visible radiation, in order to functionalize the spectral properties of uranium, by the insertion of donor species of electron pairs. For this we evaluate the electronic polarizabilities, by the use of the program POLAZ-F2.
RELATIVE SUSTAINABILITY OF THE ALTAI TRANSBORDER ECOSYSTEMS
Authors: ZHURAVLEVA O. V. , SUKHOVA M. G. , KARANIN A. V. , MALKOV P. Y.
Published: August 2021

Mountainous natural complexes of Altai cross-border territory is a unique object of studies into their durability against an external impact since they represent a complex mosaic structure. Authors used an integral characteristic as an assessment factor, which allowed to determine the durability of their soil cover. First, the river layer was converted into the scanning pattern. Next, all characteristics were translated into relative values, During the research, it was established that those ecosystems that formed on terrain consisting of steep slopes were more susceptible to adverse natural phenomena. It was discovered that the landscape is an optimal unit for determining the durability of ecosystems. The article provides results of an integral assessment of the degree of ecosystem’s ecological durability against an external impact.
SIMULATION OF THE STRESS-STRAIN STATE FOR LONG-LENGTH FLEXIBLE PIPES
Authors: YAKUBOVSKAYA S. V. , KRASOVSKAYA N. I. , SILNITSKAIA N. Y.
Published: August 2021

An algorithm for calculating the stress-strain state for a system of long-length flexible pipes on a drum is proposed. The material which the pipe is made of operates in the area of plastic deformation due to the relative small drum diameter. To take into account the nonlinear properties of the construction material, the concept of a variable (secant) module is used. The algorithm for calculating the stress-strain state of a flexible reinforced long-length pipe was compiled on the basis of the iteration method in terms of the magnitude of the change in the secant modulus. A block diagram is given. Numerical results of the stress analysis of a flexible pipe made of reinforced polyethylene are presented in the form of graphs and tables.
OPTIMIZATION OF SEMICONDUCTOR PRESSURE TRANSDUCER WITH SENSITIVE ELEMENT BASED ON “SILICON ON SAPPHIRE” STRUCTURE
Authors: GAVRYUSHIN S. S. , SKVORTSOV P. A. , SKVORTSOV A. A.
Published: August 2021

The paper is devoted to the study of the process of optimizing the semiconductor strain-gauge transducer on the structure of the SOS. As an object of the study, an elastic membrane-type element with a semiconductor strain-gauge in the form of a silicon-on-sapphire structure was used. To study the surface of sapphire, the optical photolithography method was used. In the framework of this task, the control parameters and the quality parameters of the serially-manufactured strain gauge were determined. The paper describes the methodology for multicriteria optimization, and also an optimization calculation for the strain-gauge on the SOS. The main result is the obtaining of Pareto-optimal design variants that exceed the basic variant by all quality criteria.
BIOGLYCEROL ELECTROCHEMICAL OXIDATION: TECHNOLOGICAL PROSPECTION
Authors: VIÉGAS D. S. S. , SILVA L. M. S. , MARQUES E. P. , MARQUES A. L. B.
Published: August 2021

The significant increase experienced by the biodiesel industry also brings with it the concomitant increase in the amount of glycerol as a by-product. In this sense, in order to avoid future problems arising from this accumulation, but also to make the production of biodiesel more competitive, it is necessary to seek economically viable solutions for the use of this by-product for applications in Brazil or even in the international market. In this context, the technological trends related to glycerol oxidation were carried out through the mapping of patents in different databases: INPI, European Patent Office (EPO), United States Patent and Trademark Office (USPTO), The World Intellectual Property Organization (WIPO) and revealed that there is a technological interest in the development of technology as well as found that the number of patents related to the use of electrochemical methods for the oxidation of glycerol is still little explored, consisting of opportunities for research and development with the potential to generate innovation.
ALBUMIN NANOPARTICLES: AN INTERESTING ALTERNATIVE FOR THE CONTROLLED RELEASE OF DRUGS
Authors: CAPARICA R. , MACENA J. C. , CAMARGO L. E. A.
Published: August 2021

Nanotechnology presents a tool, which controls the nanoscale matter to change itsphysicochemicalproperties. The Nanotechnology application is varied, observing an increase in the pharmaceutical area. There are several methods of obtaining; the different nanoparticles obtained provide controlled and sustained release of the encapsulated compound as well as the biocompatibility of the body system. The biocompatibility an harmless ness depends on the polymer choice. In the present study we highlight the use of bovine serum albumin as a polymer, anorigin natural protein, homologous to human serum albumin Among the advantages of using this protein as a polymer for pharmaceutical nanotechnology, we highlight its easy obtaining methodology, besides the absence of toxic organic solvents and low cost to prepare them.
BIOTECHNOLOGICAL APPROACHES IN PROCESSING OF SECONDARY RAW MATERIALS OF MEAT INDUSTRY
Authors: KURCHAEVA E. E. , MANZHESOV V. I. , MAKSIMOV I. V. , PASHCHENKO V. L. , CHURIKOVA S. Y. , GLOTOVA I. A.
Published: August 2021

The radical change in the quality of the processed meat raw materials, which does not meet the standards, calls for the necessity to apply biotechnology methods in order to improve the quality and obtain high nutritional and biological value of manufactured products in compliance with the requirements set for functional food. The use of starter cultures to perform biomodification of cattle by-products makes it possible to provide the rationale for the use of low-value secondary meat raw materials in order to expand the manufacturing range and increase the economic efficiency of meat-processing plants. This article aims to, first, review the approaches towards the development of new forms of biologically complete and environmentally safe sources of raw materials to increase the economic efficiency and reduce costs at meat-processing plants of the agro-industrial complex of the Central Black Earth region and, second, to substantiate the selection and purposefully apply bifidobacteria as part of the consortium for biotransformation of proteins of the rumen of farm animals. As a result of the research, the technology of rumen modification was suggested aimed at its further use as part of meat products, primarily, minced convenience meat products. The article data can be used to develop manufacturing formulas at meat-processing plants and also be useful for process engineers and scientists working in the food industry.
SPATIAL EVALUATION OF THE WATER QUALITY FROM THE VELHAS RIVER CHANNEL, IN THE STATE OF MINAS GERAIS
Authors: PINTO C. C. , ALMEIDA K. B. , OLIVEIRA S. C.
Published: August 2021

This study presents an evaluation of the water quality variability of 19 monitoring stations located in the channel of the Velhas river, using multivariate statistical techniques - Cluster Analysis (CA) and Principal Component Analysis/Factor Analysis (PCA/FA). Sixteen physical-chemical parameters were evaluated between January 2009 and June 2016, totalizing 27,232 valid observations. The CA grouped the nineteen monitoring stations into three groups based on the pollution levels. The PCA/FA resulted in six latent factors for group 1, four for group 2 and five for group 3, accounting for 71.44%, 65.32% and 61.69% of the total variance in the respective water quality. The factors indicated that the parameters responsible for the variations in water quality are mainly related to the release of sanitary sewage and industrial effluents and also to agriculture and livestock activities. These results reflect different water quality conditions of the Velhas River in its extension but, in fact, it is verified a greater variability of the water in the Metropolitan Region of Belo Horizonte and its downstream, justified by the different loads of pollutants received in this region, mainly the releases of domestic sewage and industrial effluents.
DOMESTIC SEWAGE EFFLUENT’S USED IN FERTIGATION OF FORAGE PLANTING CHEMICAL AND PHYSICAL CHARACTERISTICS
Authors: PENIDO D. L. A. , MARQUES M. V. A. , MATOS A. T. , COSTA M. T. M. , SILVÉRIO T. H. R.
Published: August 2021

Fertigation of agricultural crops using raw domestic sewage (RDS) has proven to be an excellent choice as opposed to conventional treatment. In this context, this work’spurpose was to evaluate the characteristics of the RDS to be applied in elephant grass fertirrigation as to its possible nutrients and pollutants. RDS was submitted to chemical (pH, COD, BOD5, Na, macronutrients and micronutrients) and physical (EC, TS, TFS and TVS) laboratory analyzes. Sodium was the referential chemical element for the definition of the RDS’s sheet to be applied to the ground, which was 215 mm of RDS at 26 cultivation weeks. NTK and P concentrations in RDS were 137 and 19.9 mg L-1, corresponding to the applied load of 296 and 43.9 kg ha-1 respectively, values that can be considered high. Furthermore, the mean concentrations of BOD5 and COD were 433 and 743 mg L-1 respectively, which leads to a COD/BOD5 ratio of 1,7, signaling a high biodegradability of organic matter in the RDS, indicative of good quality for agricultural purposes. Based on the applied sheet, it can be concluded that the RDS provided the availability of sufficient quantities of nutrients, ensuring good conditions for forage grass development.
DO LABORATORY ACTIVITIES CONTRIBUTE TO A CONTEMPORARY CONCEPTION OF SCIENCE IN INITIAL TEACHER TRAINING?
Authors: VALENCIA K. , SANJOSÉ V. , TORRES T.
Published: August 2021

In this study, It was analyzed the implementation of laboratory activities in the pre-service science teacher’s training and how they contribute to the construction of a contemporary epistemic vision of the nature of science. A cross-sectional study was developed in two different undergraduate programs of pre-service science teacher training in a university in Colombia of. We analyzed the way laboratory activities are developed in nine science subjects of physics, chemistry, and biology, apart from the first to the eight semesters of the curriculum (10 semesters in total). Results indicate that the laboratory activities focused on the development of pre-defined techniques and procedures, giving little prominence to creativity, doubt, discussion, planning, and application, even though they are also characteristic activities of scientific work. This kind of laboratory activities does not
seem to favor th e construction of a contemporary conception of the nature of science in future science teachers.
POPULATION STUDY OF THE AEDES AEGYPTI MOSQUITO AND MEASURES OF INTERVENTION IN THE FIELD WITH USE OF ESSENTIAL OIL OF CROTON RHAMNIFOLIOIDES WITH DETERRENT EFFECT
Authors: SALES J. B. R. , OLIVEIRA E. J. A. , NAVARRO D. M. A. F. , AMORIM L. B. , RODRIGUES S. S. F. B.
Published: August 2021

The control of the mosquito from larvicides has been the most used form in the prevention of diseases, however, populations of Aedes spp. have become resistant to these compounds, requiring more efficient and less aggressive forms of control to the environment. The objective of this work was to carry out a mosquito population study and to test the efficiency in Croton rhamnifolioides essential oil field as an oviposition deterrent in 30 traps installed in the Várzea-Recife cemetery. The traps were randomly divided into two groups, using 15 test traps containing essential oil and another 15 for control. The essential oil was obtained by hydrodistillation with a content varying from 0.58% to 1.4% (w/w) and its chemical constituents identified by gas chromatography coupled with mass spectrometry, presenting 1,8-cineol (16.57% ) and (E) -Caryophyllene (11.32%) as major constituents. The test of deterrence was repeated 25 times over a period of 12 months. The oil was used at a concentration of 100 μg · mL-1. The detergency response to oviposition was evaluated by counting and comparing the number of eggs placed in each set of traps. As results, 110,157 eggs were collected, presenting an infestation index of 99.8%. Of the 2,964 larvae analyzed, 96% were A. aegypti and only 4% A. albopictus. The oviposition delayed effect was observed in 17 (68%) of the 25 analyzed cycles, with ovitraps with oil showing a quantity of eggs 39% smaller than the number found in the control ovitrampas. The T-student test showed significant difference between test and control ovitrampas (p 0.002). It was concluded that the Várzea cemetery had a high rate of infestation of Aedes spp. and that the essential oil emulsion tested had deterrent power, despite the adverse conditions encountered in the field and the volatility of essential oil. It is recommended, however, additional studies aiming at enhancing its deterrent oviposition power in the field.
BUILDING A SPECTROPHOTOMETER WITH RECYCLED MATERIALS. PART I
Authors: CERVELIN A. , DE BONI L. A. B.
Published: August 2021

The present work addresses the possibility of reusing obsolete components for the elaboration of didactic quality laboratory equipment. Recycling computers, which still work but no longer deliver the performance expected for their primary functions, is an interesting way to extend the life of electronics. Also, the possibility of reusing MDF (Medium Density Fiberboard) residues was successfully explored. A functional spectrophotometer with recycled materials was built. The quality and quantity of software available on the internet for the visualization of the obtained spectra is high. The simplified optical system has limitations but maintains sufficient quality to be used as a didactic tool. Improvements that can be made to this equipment include, but are not limited to, inclusion of a more suitable optical system with a focal lens array, more defined diffraction grating, and replacement of the imaging system with a filterless system. UV, making it possible to obtain spectra outside the visible light range. During the construction of the apparatus and its tests in the classroom (outside the didactic chemistry environment), it was possible to observe the students interest in science, indicating that this type of experiment can be further explored in the education system.
USE OF PHYSIOLOGICAL-BIOCHEMICAL, CELLULAR AND SUB-CELLAR CHARACTERISTICS OF BETULA PENDULA AS MARKERS OF SEED GERMINATION AND MONITORING TERRITORY POLLUTION
Authors: VOSTRIKOVA T. V. , ZEMLYANUKHINA O. A. , KALAEV V. N.
Published: August 2021

The amount of total soluble protein cytogenetic indices, germination ability in the seed progeny of Betula pendula in areas with different levels of anthropogenic pollution was studied. The seed progeny of Betula pendula has an increased germination ability and total protein in areas with low pollution levels as compared to the control group (seeds collected in the ecologically clean territory) and to the same parameters for the areas with high levels of anthropogenic pressure. A high positive correlation was established between seed germination and the amount of total soluble protein. The parameter “amount of total protein” is characterized as a marker of seed germination, which determines the possibility of their germination. Cytogenetic parameters (mitotic activity, percentage ratio of cell number at mitosis stages, level of mitosis pathologies, level of cells with persistent nucleoli at metaphase - anaphase mitosis stage) of seed seedlings of weeping birch were studied as marker signs of anthropogenic pollution of territories. Relations between cytogenetic and biochemical characteristics were found. The impact of the environment, caused mainly by heavy metal pollution, on birch trees and their seed progeny, can be defined as hormesis by biochemical and cytogenetic indices. A comprehensive study of cytogenetic and biochemical parameters can allow a quick and adequate evaluation of the seed quality of unknown origin which is especially important for plant industry and forestry as it allows selecting stable planting material and for the collection of material for pharmacognostic purposes in areas with different ecological pressure. Determining cytogenetic indices and the amount of total protein allows forecasting the germination capacities and germination abilities of the seeds of the weeping birch.