bluuebunny/crossref_metadata_2025 huggingface dataset:
THE CHEMICAL COMPOSITION OF SOME SORGHUM GENOTIPES FOR GRAINS CULTIVATED IN THE CENTER OF MOLDOVA
Authors: ISTICIOAIA SIMONA – FLORINA , MIRZAN OANA , POPA DIANA , NAIE MARGARETA , VLADUȚ VALENTIN , VOICEA IULIAN
Published: May 2021

In the lab, three sorghum hybrids for grains cultivated in the Center of Moldova were analyzed qualitatively, two of them having white grains, and one having red grains. Two of the hybrids, one with white grains (Albanus) and one with red grains (Alize) came from Euralis SAS France, and the third, with white grains, came from N.A.R.D.I. Fundulea Romania (Fundulea 32). The results obtained from the laboratory investigations indicated that the variation of the chemical composition of the sorghum grain depending on the cultivated hybrid.
A NUMERICAL STUDY REGARDING THE INFLUENCE OF THE LONGITUDINAL EXTENT OF A T-SHAPED CRACK ON THE EIGENFREQUENCY DECREASE OF CANTILEVER BEAMS
Authors: Tufisi Cristian , Gillich GILBERT-RAINER
Published: May 2021

The paper analyzes the effects of T-shaped cracks in beams regarding the manner in which the frequencies of the bending modes change. We determined the eigenfrequencies of the damaged beam involving the finite element method for five lengths of the branched crack’s longitudinal components and numerous crack locations. This permitted plotting the frequency shifts curves and calculating the relative frequency shifts. Afterward, we extracted the damage patterns for all crack types and one crack position. It was found that the patterns are quite similar, just differing by their amplitudes, thus by normalization the damage severity effect can be suppressed.
NEW PYRIDINE-3-SULFONATO TIN (IV), ANTIMONY (III) AND (V) HALO ADDUCTS AND COMPLEXES: SYNTHESIS AND INFRARED STUDY
Authors: GUEYE AÏSSATOU , DIOP MOUHAMADOU BIRAME , DIOP LIBASSE
Published: May 2021

Six new tin (IV), antimony (III) and antimony (V) adducts and complexes have been synthesized. Discrete structures were suggested on the basis of infrared data. Within the structures, the anion behaves as a bidentate, monochelating and monodentate, monodentate and tri O-chelating ligand. The environments around metallic centres are octahedral. Considering preamble of extra hydrogen bonds in compounds containing water molecules and/or OH groups, supramolecular architectures may be given rise.
EVALUATION OF THE MODEL PREDICTION TOXICITY (LD50) FOR SERIES OF 42 ORGANOPHOSPHORUS PESTICIDES
Authors: FIKRI HANANE , FECHTALI TAOUFIQ , MAMOUMI MOHAMED
Published: May 2021

Structure-Toxicity Relationships have been studied for a set of 42 organophosphorous pesticides (OPs) through multiple linear regression (MLR) and artificial neural networks (ANN). A model with three descriptors, including: total lipophilicity [log (P)], widths radicals R1 [(LR1)] and R2 [(LR2)] has achieved good results in phase Training and phase prediction of toxicity [log LD50 (lethal dose 50, Oral rat)]. The linear model (MLR: n=40, r²=0.86, s=40 and q2 = 0.66) and non-linear model with a configuration [3-6-1] (ANN: r²=0.95, s=0.73 and q2 = 0.17) have proved very successful and complementary. The selected descriptors indicate the importance of lipophilicity and widths radicals R1 and R2 in the contribution of the toxicity of pesticides derived from OPs used in this study. This information is relevant for the design of a new model of non-toxic pesticides OPs.
ROUTE FIRST-CLUSTER SECOND METHOD FOR PERSONAL SERVICE ROUTING PROBLEM
Authors: EKİZ MELİKE KÜBRA , BOZDEMİR MUHAMMET , TÜRKKAN BURCU ÖZCAN
Published: May 2021

The Vehicle Routing Problem (VRP), which has many sub-branches, is a difficult problem that cannot be solved using classical methods. This study includes a case study for Service Routing Problem, which is one of the sub-branches of VRP. The case study is a problem of determining service routes for staffs of a company. In this context, we first assigned the employees to the stations, and then we reached a solution using the route first-cluster second heuristic method. We used the Genetic Algorithm (GA) to improve the route and compared the results by creating different scenarios in clustering methods.
VIBRATIONAL CASE STUDY FOR THE MOLD OSCILLATOR WITH HYDRAULIC SERVO SYSTEM
Authors: PARK YONGHUI , CHANGWOO LEE , DONGWOOK KIM
Published: May 2021

We have conducted sensitivity analysis to investigate the two-hydraulic-servo system for the mold oscillator. By modelling mathematical models for operating fluid flow to control a hydraulic cylinder, we changed design parameters and environment conditions including friction, additional spring stiffness and fluid leakage. From the one-hydraulic servo system to the two-hydraulic cylinder, modal analysis was conducted to figure out dynamic characteristics of the real system. Especially, we categorized important natural mode shape. When the system was excited into the natural frequency, the 1st mechanical natural frequency could cause a pressure gain by reducing internal pressure of a hydraulic cylinder, but other natural frequencies were critically dangerous by generating imbalance, over-vibration and distortion. By comparing the results to the experimental data, we could find a dramatic pressure drop near 3 Hz oscillation when the system has the 1st mechanical natural frequency 2.499 Hz. Also, the system has the imbalance near 6 Hz oscillation when the system has 2nd mechanical natural frequency 5.446 Hz. Based on these fact, we have suggested some tips to oscillate a mold efficiently and safely.
CARBOXYLATO ADDUCTS AND DERIVATIVES CONTAINING SnR3 (R = Ph, Me) AND SnMe2 RESIDUES: SYNTHESIS, INFRARED AND MÖSSBAUER STUDIES
Authors: BASSENE SEYDOU , BOYE MOUHAMADOU SEMBENE , SIDIBE MAMADOU , DIOP LIBASSE
Published: May 2021

Twelve new carboxylato adducts and derivatives containing SnR3 (R = Ph, Me) and SnMe2 residues have been synthesized and characterized by elemental analyses, infrared and 119Sn-Mossbauer spectroscopies. The proposed structures are discrete or of infinite chain type, the carboxylate anion behaving as a bridging bidentate, a monodentate, a tetradentate or a monochelating ligand.
ANOVA OPTIMIZATION OF DRILL BIT TEMPERATURE IN DRILLING OF PURE AND CARBON BLACK REINFORCED HIGH DENSITY POLYETHYLENE
Authors: UYSAL ALPER
Published: May 2021

High density polyethylene materials have many application areas in automotive, aviation, electrical and electronic etc. industries. In some applications, their mechanical properties need to be improved. For this reason, some particles such as carbon black, graphite, carbon nanotubes, carbon fibers etc. were added to the polymer matrix. Although these types of material can be manufactured in near net shape, some machining operations such as drilling need to be performed. In this study, the drill bit temperatures in drilling of pure and carbon black reinforced high density polyethylene (HDPE) were optimized by using ANOVA (analysis of variance) statistical method.
VARIATION OF HARMONICS EMISSION FROM MODERN LAMPS IN A POWER SUPPLY NETWORK
Authors: ISTÓK RÓBERT
Published: May 2021

The objective of this paper is to prove the relationship between the Total Harmonics Disturbance emission of lamps network and the number of lamps. In the lighting field the LED lighting emission diode is the absolutely winner. The low power consumption and the characteristics of LED made it ideally for most of indoor and outdoor applications. The dimmability of the LEDs which is between 0% and 100% made it ideally for intelligent lighting applications. This large dimmability range could be obtained only with incandescent and halogen bulbs, compare to CFL compact fluorescent lamps where the maximum dimmability is around of 60%. One of the prices of this positive characteristics of modern lamps, is the electromagnetic compatibility EMC. It is well known that the modern lamps have a common part, and this is the electronic ballast. And as all electronics circuits, the electronic ballasts are an important source of EMC noise emission. The noise emission of electronic ballast is mainly conducted emission type. Start from construction of electronic ballast which contains an AC/DC converter and a buffer capacitor the emission of half harmonics is presented too. The emission of half harmonics is proportionally with the cost of lamps, because the cost of lamps depends by the methods used for noise emission rejection too. Typically the cheaper lamps have a higher noise emission than the expensive lamps. Known of noise emission lamps separately is not enough for characterization of low noise emission from lighting network. The low frequency noise emission of a lighting network is lower than in case of a single lamp. The variation of temperature determines a variation of low frequency noise emission too.
USE OF THE MICROWAVE ENERGY FOR ALUMINUM WASTE FOAMING
Authors: PAUNESCU LUCIAN , DRAGOESCU MARIUS FLORIN , AXINTE SORIN MIRCEA , SEBE ANA CASANDRA
Published: May 2021

The paper presents an aluminum foam experimental technique using the microwave energy. The raw material was recycling aluminum waste processed by ecological melting and gas atomizing to obtain the fine powder required in the foaming process. The powder mixture was completed with dolomite as a foaming agent. The products had a fine and homogeneous porous structure (pore size between 0.4-0.9 mm). The density (1.17-1.19 g/cm3), the compressive strength (6.83-7.01 MPa) and the thermal conductivity (5.71-5.84 W/m·K) had values almost similar to the foams made by conventional methods.
AUTOMATED CUTTING TOOLS SELECTION FOR BEARINGS COMPONENTS TURNING PROCESS
Authors: PRUTICA DAN GEORGE , BRABIE GHEORGHE , CHIRITA BOGDAN
Published: May 2021

Due to the high potential of improving efficiency and productivity in machining operations, the automated cutting tools selection and the optimization of cutting parameters has been an area of high interest for many researchers in the frame of CAPP systems development. Through the work presented in this paper an automated cutting tools selection algorithm for roughing and finishing turning has been realized. An example for turning of the outer rings for large-size single row cylindrical roller bearings has been presented to illustrate the application of the proposed algorithm and analyze the results.
USE OF NATURAL DOLOMITE AS A CHEAP FOAMING AGENT FOR PRODUCING GLASS FOAMS FROM GLASS WASTE IN THE MICROWAVE FIELD
Authors: PAUNESCU LUCIAN , DRAGOESCU MARIUS FLORIN , AXINTE SORIN MIRCEA
Published: May 2021

The paper presents experimental results obtained in the process of making glass foam from glass waste using a cheap foaming agent (natural dolomite). The originality of the work is the application of the microwave energy, unlike the conventional techniques commonly used in the world. The main advantage highlighted by the experiments is the very low specific energy consumption (below 1.5 kWh/kg), due to the peculiarities of the microwave heating technique. The foamed product has physical, mechanical and morphological characteristics (density between 0.30-0.32 g/cm3, thermal conductivity between 0.064-0.067 W/m·K, compressive strength in the range 2.2-2.6 MPa), which are similar to those of foams made by conventional methods and are suitable for its use as insulating material in construction.
SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF SOME NEW HYDROGENOXALATO ORGANOTIN (IV) COMPLEXES
Authors: BOYE MOUHAMADOU SEMBENE , DIASSE-SARR AMINATA , DIOP LIBASSE
Published: May 2021

The synthesis and spectroscopic studies (infrared and Mössbauer) of new hydrogenoxalato derivatives and adducts containing SnRn (R=Me, Ph; n=2, 3) residues are reported. Based on their spectroscopic data dimeric and polymeric structures containing hexacoordinated or pentacoordinated Sn are suggested, the hydrogenoxolate anion behaving as a monocoordinating or a monochelating ligand. In two studied adducts, supramolecular architectures may be obtained when extra hydrogen bonds involving the free NH groups are considered.
STUDY OF PHYSICOCHEMICAL AND MICROBIOLOGICAL QUALITY OF THE SPRING WATERS OF THE REGION OF OUM TEBOUL WILAYA OF EL TARF- ALGERIA
Authors: BOUCHELAGHEM SABRINA , MOUISSI SAMIA , BENZERAA CHAIMA , KHALFOUN ROUMAISSA
Published: May 2021

The present work aims to assess the physico-chemical and microbiological parameters of the waters of the three sources (Ain Bergougaya, Ain Sigleb and Siporex) in the region of Oum el Teboul wilaya of El Tarf. Parameters such as temperature, pH, conductivity and salinity were measured in situ with a field multimeter. Hardness (62 mg/L to 266 mg/L), salinity (0.01 to 1 mg/L). From a microbiological point of view, there has been no evidence of the complete absence of germs of contamination such as total coliforms and fecal coliforms. This study compared to the drinking water standards shows that the waters in the area studied are of good quality.
COMPARATIVE ANALYSIS OF THE FOAM GLASS GRAVEL TYPES EXPERIMENTALLY PRODUCED BY MICROWAVE IRRADIATION
Authors: COSMULESCU FELICIA , PAUNESCU LUCIAN , DRAGOESCU MARIUS FLORIN , AXINTE SORIN MIRCEA
Published: May 2021

The paper presents an unconventional technique for manufacturing foam glass gravel. The numerous experimental results obtained by the authors in the last year using various manufacturing recipes common in the world industrial production by conventional techniques were selected and subjected to a qualitative and energy efficiency comparative analysis, aiming to determine the best foam glass gravel manufacturing procedure under the conditions of the use of the microwave energy. The optimum recipe was composed of 83% glass waste, 1 % glycerol, 8 % sodium silicate and 8 % water. The maximum heating temperature reached 823 ºC with a very economical energy consumption of 0.88 kWh/kg. The sample characteristics were apparent density-0.24 g/cm3, porosity-89.1% with pore size between 0.3 - 0.6 mm, thermal conductivity-0.063 W/m·K and compressive strength - 5.9 MPa, almost similar to those industrially obtained.
CONSIDERATIONS CONCERNING THE EVALUATION OF TOWING FORCES FOR ROAD TRANSPORTATION OF AGABARITICAL MECHANICAL EQUIPMENT
Authors: IATAN RADU , STATESCU MIHAI , DURBACA ION , ENACHESCU GEORGIANA LUMINITA
Published: May 2021

The full safety of operating industrial mechanical equipment, in particular the over-sized ones, with a complex structure, is ensured by compliance with all necessary requirements, starting with design, fabrication, transportation from the supplier to the recipient and operation within the working parameters. The present article that is continuing the analysis of transportation stages of over-sized and heavy equipment, as can be seen from the attached bibliography, takes into consideration the evaluation of the towing forces, in the case of two distant platforms. The masses of the transported components, the characteristics of the roadways, as well as the character of the movement and the influence of the wind loads are considered.
EXPERIMENTAL INVESTIGATION OF A CONCEPT WAVE ENERGY CONVERTER FOR HARNESSING LOW AMPLITUDE SEA WAVES
Authors: KAYODE OLAKUNLE , AJEWOLE TITUS OLUWASUJI , KOYA OLUFEMI ADEBOLA
Published: May 2021

This paper presents the results from experimental validation of numerical simulation of a concept wave energy converter for low amplitude sea waves. The device was conceived to contain a wave amplifying device (WAD) to magnify the wave height of incident waves while point absorber buoy(s) efficiently harness the wave energy for electricity production. The validation results show that the optimum aperture angle for the WAD is 45±2 degree, and wave height magnification of 170% is possible. The optimal buoy shape for the device was confirmed as concave wedge buoy. The combination of the two in a single device shall make economical the harnessing of low amplitude waves.
A FLUID FLOW ANALYSIS OF A JET EJECTOR SYSTEM USED IN INDUSTRIAL APPLICATIONS
Authors: OLARU IONEL
Published: May 2021

Many studies have been conducted for jet ejectors used in the recovery of solar energy or for their use in refrigeration systems for various industrial applications. Generally, these types of ejectors are using water as the working fluid because water have a low cost, a chemical stability and is safe to use. Naturally, other refrigerants, with large-scale application for industry, can be used. In such a type of jet ejector, besides selection of the refrigerant, the design of ejector is very important, with strongly influence to the performance, because the compression ratio depends on the geometry of the nozzle and on the geometry of the diffuser. Compared to other refrigeration systems, those with ejector have some advantages: simplicity in construction, high liability and low cost. However, it has a coefficient of performance lower than conventional systems, this limited the widespread application of ejector refrigeration systems.
FORMULATION OF CONCRETE BASED ON PLANT MATERIALS (CASE OF RICINODENDRON HEUDELOTII: AKPI): OPTIMIZATION OF THE PROPORTION OF SHELLS
Authors: SERIFOU MAMERY ADAMA , OUATTARA SOULEYMANE , TRAORE BRAHIMAN , KOUAKOU CONAND HONORE , EMERUWA EDJIKEME
Published: May 2021

The aims of this work is to study the influence of the partial substitution of natural aggregates by the nut shells of Ricinodendron heudelotii known as AKPI, on the physical-mechanical properties of concrete. The substitution rates made are 5%, 10% and 15%. Test results indicate that the presence of Akpi nut shells (ANS) causes increased porosity and reduced compressive strength of concrete. Increasing of porosity and decreasing of strength become important when the quantity of shell increases in concrete. However, the kinetics of hardening at a young age of the concrete is improved from 1% to 7%.
DESIGN AND FABRICATION OF AN ELECTRICALLY POWERED MAIZE PLANTER
Authors: SOYOYE BABATUNDE OLUWAMAYOKUN
Published: May 2021

The correct application of production inputs for environmental and agricultural production sustainability is a key to successful production of maize. An electrically powered maize planter was designed and fabricated. Light reflecting optoelectronic field counter capable of detecting free falling object with equivalent or greater than 0.7 mm distance in planter delivery tube was designed and built to monitor seed drop on the planter. The device accurately counted the falling seeds with the planter forward speed of 1.38 m/s and seed delivery tube of 24 mm. The average number of two seeds was discharged per hole.
THE IMPACT OF THE UNIFIED POWER FLOW CONTROLLER ON MAXIMIZATION OF LOADABILITY OF ELECTRIC POWER GRID
Authors: ADETONA SUNDAY , SALAWU RAIFU , OKAFOR FRANK , ADEYEMI JOSEPH
Published: May 2021

The building of additional transmission network to meet the demand of the ever-increasing load is expensive, and time consuming. An alternative to constructing new lines is the incorporation of the Flexible Alternating Current Transmission System (FACTS); in which a Unified Power Flow Controller (UPFC) is a member of the ménage, which can be modelled as a combination of Static Var Compensator and Thyristor Control Series Compensator. This study determines the optimal location of the UPFC by randomly adding loads to the existing transmission network until the Fast Voltage Stability Index of one of the lines is at a critical point. This is the vital line in which UPFC components are added. The sizing of the components of the UPFC is determined using Artificial Bee Colony algorithm. The IEEE 30-bus network is exploited as the test bed. The results obtained reveal that the optimal positioning and sizing of the UPFC for the purpose of maximizing loadability of the grid when load angles are assumed to be negligible are the same as when the load angles are considered. The loadability of the test bed when UPFC is not injected in the grid is 440.376 MW, whereas, it is 837.915 MW when the UPFC is optimally located and sized; and this represents 90.27 %. The sizes of the shunt and series components of the UPFC that assist in realizing this maximization are -0.2780 pu and 0.1000 pu respectively.
EVALUATION OF GREENHOUSE GAS EMISSIONS FROM SOLID WASTE MANAGEMENT PRACTICES IN STATE CAPITALS OF NORTH EASTERN NIGERIA
Authors: BALTHI MSHELIA RICHARD
Published: May 2021

Greenhouse gas (GHG) emissions due to solid waste management (SWM) techniques being practiced in the North eastern region of Nigeria are unaccounted for as such these emissions cannot be monitored or controlled. This research estimated GHG emissions into the atmosphere from the current SWM technique practiced in the region, GHG emissions from two different waste management techniques – open burning and incineration was also simulated. The research found that incineration with electricity recovery is the most suitable SWM process therefore suggested that the authorities and other stakeholders in the region should give it serious consideration.
APPLICATION OF LEXICOGRAPHIC METHODS IN FINDING NEW SOLUTIONS FOR THE CONSTRUCTION OF SWITCH FAUCETS
Authors: CIUBOTARIU VLAD ANDREI , OLARU IONEL , RADU CRINA MARIA , GRIGORAS COSMIN
Published: May 2021

Methods and techniques to stimulate creativity are indispensable in the process of obtaining more reliable and competitive products. For the elaboration and efficient use of logical-deductive methods and techniques in creativity, it is necessary to know a minimum of combinatorics, which include arrangements, combinations, permutations, graphs and finite networks. From the multitude of methods of orderly enumeration of all ensembles, without omissions or repetitions, the lexicographic method is recommended, according to which, the assemblies are ordered in ascending order according to the sum of the component elements index. The main purpose of this paper is to apply the lexicographic method to obtain a more efficient flow faucet body in terms of working fluid behavior. Thus, the pressure, flow, velocity variation and degree of fluid vorticity have better values for the faucet body obtained by applying the lexicographic method. Therefore, by applying the flow simulation method, it was possible to characterize the behavior of the working fluid.
REMOTELY CONTROLLED CAR SPEED GOVERNOR
Authors: IYIOLA ALONGE OLUWASANMI , ADETUNJI ABIOLA OLURANTI , PETER OKEDIJI ADEBUNMI , OLANREWAJU ALABI ISMAILA
Published: May 2021

This study modifies a car speed limiting device with a view to avoiding car over speeding. The speed limiter was modified by incorporating a carrier chip to coordinate the activities of the speed limiter. When the car speed exceeded the designed speed limit, the speed governor came into action and restricted the car from going beyond the pre-set speed by actuating the relay. Warning signal in the form of alarm was activated, and the receiver sent a message to the owner. The study concluded that the modified speed governor design is better, safer and remotely controlled compared to the existing design.
EXPERIMENTAL EVALUATION OF THE SOLID PARTICLES BEHAVIOR IN A VERTICAL AIR FLOW BY USING IMAGING ANALYSIS
Authors: MOSNEGUTU EMILIAN-FLORIN , BARSAN NARCIS , CHITIMUS ALEXANDRA-DANA , TOMOZEI CLAUDIA , RISTEA MIHAIL
Published: May 2021

To analyse the behavior of a solid particle in a vertical ascending air flow a series of studies have been carried out, both theoretical and experimental. This article presents a new method of imaging analysis of the behavior of a solid particle, in order to extend this study through experimental applications. The working algorithm implies the analysis of images in different positions of the solid particle in the vertical ascending air flow, analysis in relation to a reference image. By using the mathematical apparatus, i.e. Mathcad software, the movement of the solid particle in the air flow has been emphasized.
ANALYSIS OF MOBILE TELECOMMUNICATION PATH LOSS IN RURAL COMMUNITIES
Authors: OKANDEJI ALEXANDER , ONAIFO FRANK , OLAJIDE MATHEW , OKUBANJO AYODEJI , FASANYA HEZEKIAH
Published: May 2021

In this work, a cheaper alternative method of determining path loss using Network cell info lite software is proposed. Hata-Okumura model is used in the determination of path loss and signal strength of mobile communication devices within Ibogun and Ifo, a suburban community in Ogun state, Nigeria. Additionally, this paper is also aimed at determining the path loss under transmission line to ensure proper network planning in areas covered by transmission lines. Result obtained shows that areas with pylons have greater path loss compared to areas with no pylons. It is recommended that the power levels of base station operating in this area should be increased.
DESIGN AND FABRICATION OF AN IMPROVED MOTORIZED MAIZE SHELLER/THRESHING MACHINE
Authors: SEDARA ADEWALE , ODEDIRAN EMMANUEL , MANUWA SETH
Published: May 2021

One major essential operation in processing maize is shelling of maize. Maize shelling is one of the most important processing operations carried out in maize processing since it’s among the widely consumed grains all over the world. Shelling bring out good quality of maize which not only prolong its useful life, but also increase the net profit farmers make from its mechanization. Component parts such as: frame, hopper, transmission shaft, cylinder with spikes and blower, concave with sieve, power source, pulley and bearings was designed and fabricated. It can be moved to where it’s needed this would encourage farmers to shell their maize grains on the farm.
Influence of the Copper Smelter in Krompachy (Slovakia) on Atmospheric Deposition
Authors: HANČUĽÁK Jozef , ŠPALDON Tomislav , ŠESTINOVÁ Oľga
Published: May 2021

The contribution deals with the evaluation of atmospheric deposition monitoring in 2009–2017 which was realised in the vicinity of the copper smeltery in Krompachy (Slovakia). The samples were collected from the seven sites, which are located from 1.2 to 10 km from the main pollution source. The atmospheric deposition fluxes of solid particles and elements (Fe, Al, Mn, Zn, Pb, Cu, Cr, Cd, As) were determined separately for “water soluble” and “insoluble” fraction. The detailed analysis of deposition fluxes showed a significant effect of the copper smeltery. In addition to the expected high levels of deposition of copper (21–140), the above-average high deposition of lead (11–124), zinc (86–464) and cadmium (0.6–3.4 μg.m–2.day–1) were measured in comparison with different areas. The highest values of deposition fluxes of these elements were detected at sites near the copper smeltery. The level of zinc deposition disagrees with its registered emissions.
Studies on Physicochemical Properties of Selected Apiproducts as Materials for Preparation of Protein Spheres
Authors: KUDŁACIK-KRAMARCZYK Sonia , GŁĄB Magdalena , DRABCZYK Anna , TYLISZCZAK Bożena , KOŁOCZEK Henryk
Published: May 2021

The main purpose of this work was to determine the impact of the location of bee apiaries in diff erent parts of Poland on the physicochemical properties of selected bee honeys. Studies focused on the determination of the antioxidant properties of apiproducts. Th e water content in honeys as well as their pH values were also analyzed. Four types of honeys (honeydew, linden, buckwheat, acacia) originating from various parts of Poland were selected for the research. Based on the obtained results, it can be stated that the examined honeys differed in physicochemical properties, which was related to the diff erences in their chemical composition. All honeys tested showed antioxidant properties. It can also be found that the water content in analyzed products was related to their origin and variety. Analyzing pH measurements, it can also be observed that all tested samples were characterized by acidic properties.
Mechanochemical Reduction of Synthetic Sulphidic Copper-Bearing Minerals in an Industrial Scale
Authors: TEŠINSKÝ Matej , BALÁŽ Matej , RAJŇÁK Michal , KAŇUCHOVÁ Mária , BALÁŽ Peter
Published: May 2021

In this paper the mechanochemical reduction of binary sulphides chalcocite (Cu2S) and covellite (CuS) by elemental iron wereinvestigated. The composition and properties of nano-powders prepared by high-energy milling were analyzed by X-ray diffraction,X-ray photoelectron spectroscopy and magnetic measurements. The XRD results showed that in case of chalcocite Cu2S the reactiontakes place until 360 minutes, as no elemental iron, could be identified afterwards. In case of covellite CuS, after 480 minutes of mechanochemicalreduction, a significant amount of non-reacted elemental iron could still be observed. The investigation of magneticproperties reveals significant decrease of saturation magnetization as a result of milling. XPS results showed a significant surfaceoxidation in both systems. Unlike the conventional high-temperature reduction of chalcocite and covellite, the mechanochemicalreduction is fast and ambient temperature and atmospheric pressure are sufficient for its propagation.
Cristianismo, uma experiência multicultural: como viver e anunciar a fé cristã nas diferentes culturas
Authors: Azevedo Marcelo
Published: May 2021

Nestes dias do Quinto Congresso Missionário Latino-Americano, começamos a viver juntos um momento muito significativo de nossa vocação cristã...
Envolvimento e Desenvolvimento: introdução à simpatia de todas as coisas
Authors: Mendes Armando Dias
Published: May 2021

Para os fins deste ensaio, defino desenvolvimento como a criação de condições tendentes à promoção do ser humano em sua integridade. É, portanto, um processo plus o sucesso resultante...
“A vida na verdade”
Authors: Trasferetti José Antônio
Published: May 2021

Vaclav Havel é um filósofo que pensa a sociedade a partir de categorias filosóficas delimitadas e circunscritas dentro do seu tempo. A presente dissertação é um estudo filosófico sobre a filosofia que se encontra nos seus textos...
O evangelho nas culturas, caminho de vida e esperança
Authors: Almeida Antônio José de
Published: May 2021

O Quinto Congresso Missionário Latino-Americano - COMLA 5 - realizou-se, de 18 a 23 de julho de 1995, em Belo Horizonte, Minas Gerais, Brasil. Promovido pelas Pontifícias Obras Missionárias e pela Conferência Nacional dos Bispos do Brasil, teve como tema “O Evangelho nas Culturas - Caminho de Vida e Esperança”. Este Relatório não é uma “crônica” dos acontecimentos do Congresso (esta foi providenciada pelo Ir. Ismael Néry). Procura recolher as mensagens, experiências, reflexões e proposições colocadas em comum durante aqueles seis dias de intenso trabalho...
Cluster governance of School-university clusters
Authors: Collin Sven-Olof
Published: May 2021

University-School clusters: Best practices and the prospects for their adaptation to Ukrainian context : the XVIII International Scientific and Practical Conference (14-th Febuary 2020, Kharkiv Univ. of Humanities “People’s Ukrainian Acad”.

The proceedings of the XVIII International Scientific and Practical Conference “University-School clusters: include a variety of articles on the issues of the formation of a cluster-based educational model and its role in the development of the educational space.Covered are the essence of university-school clusters, the conceptual framework for their evolvement, development, and functioning in todays context with special attention paid to the models of the university management under the cluster-based educational system as well as to the problems and prospects of interaction between the key stakeholders in cluster systems.
The main ways to improve the quality of training highly qualified scientific personnel
Authors: Prokopenko I. , Boychuk Yu
Published: May 2021

The article is devoted to improving the quality of highly qualified scientific personnel training in graduate school. It is indicated that necessity of forming the postgraduates’ readiness for innovative activity has become relevant due to the transformation of sociocultural values, exacerbation of globalization processes, the dominance of the innovative way of developing the society. It is the most important indicator of their preparation for future professional scientific and pedagogical activity. Postgraduate’s readiness for innovation activity is considered as a future specialist personal education. It characterizes is ability to professional self-development, practical use of obtained scientific results and quick adaptation to the new professional requirements, taking into account the innovative way of economic development and competitive conditions of the modern labor market. The article identifies the main ways to improve the quality of training highly qualified scientific personnel (strengthening the requirements for the selection of candidates which enter the graduate school, the appointment of scientific advisors, preparation of scientific and educational programs for doctors of philosophy based on the educational fundamentalization, interdisciplinarity, innovation, scientific and practical orientation). It is also important to create special scientific educational environment in the institution of higher education. It provides for the informatization of scientific educational process, organization of joint educational research and development centers, opportunities for the academic mobility and individualization of postgraduate training.
Smartphoneware of the country
Authors: Leonov V.
Published: May 2021

Now in Ukraine it is necessary to introduce new philosophy of management. It should be administered at most from upstream, and at least from top down activities. It sounds a little absurdly, but that is how the management is organized in wildlife. We believe that with that management philosophy it is possible to reach the situation, when in the first place there will be the requirements of a common man, rather than oligarchs needs.

In biological systems the mechanisms of self-regulation, self-management and self-preservation have been generated for millions of years.These mechanisms are based on phenomena of a system of negative and positive feedbacks through upstream signals from cells to the brain. For human society an effective upstream management system can be direct democracy, when the people in the Territories by voting determine how to solve any particular problems of there local life. Referendums and face-to-face interviews with residents are the ways of introducing direct democracy.

In the society the formation of new delibarative and executive structures that would be confirmed by law is necessary for implementation of upstream governance mechanisms. The major purpose of new governing bodies should be the fulfillment of objectives for satisfaing the needs of common people. They could be informed above these needs in an electronic format through smartphones.

So basically, smartphones can became those nerve fibres that connect an individual with public authorities. The useful function of "smartphoneization" can be associated with the fact that with its help it is possible to bring into force the mechanism of direct democracy in Ukraine, and through it an upstream management system.
Innovative technologies of familiarization of children of the senior preschool age with the native land
Authors: Starikova L.
Published: May 2021

The article discusses the use of innovative technologies in the process of familiarizing children of senior preschool age with their native land. The ways of formation of knowledge of senior preschool children about their native land are highlighted.
Studying by M. I. Kostomarov the initial stages of the Ukrainian people history and its influence on the formation of national consciousness
Authors: Yurchenko O.
Published: May 2021

This work is devoted to the analysis of the outstanding domestic scientist and teacher N. I. Kostomarov contribution to the disclosure of the origins of the history of Ancient Russia and the initial stages of the formation of the ethno-national consciousness of its population. The scientific approaches of the scientist to the analysis of the emergence of statehood in the Old Kiev territory theories are considered. The scientific methods that scientists used to analyze this problem are shown, in particular, the analysis of the primary sources, the linguistic approach to the origin of geographical names and others were used. Particular attention is focused on fine-tuning by domestic scientists the lack of Normans influence on the public people’s life. The article emphasizes that the scientists' proof of the fallacy of the origin of Russia Norman theory contributed to the development of student interest in Slavic self-knowledge. The understanding of the contribution of N. I. Kostomarov to the question of dividing the Russian population by type of ethnic community and social organization is of considerable academic interest. It is emphasized that among the inhabitants of Kievan Rus, the scientist singled out the ancestors of modern Ukrainian and Russian, whose historical process and folk characteristics continued to receive a more expressive specificity over time. The conclusion is made about the existence and development of its own Slavic state beginning in the process of the formation of Kievan Rus. The practical importance is the identification of creating a nation in Old Kiev times factors in the work of N.I. Kostomarov. The formation of a territorial community, the unity of the country's population, the power structures of the then society, the development of popular democracy forms, the influence of local self-government on the formation of political unity is of significant. It is noted that the practical importance of studying the national experience combines both with the solution of modern problems of the country and the upbringing of the young generation political development.
SUPERVISOR’S AND TOURISM STUDENTS' EVALUATION OF WORK INTEGRATED LEARNING: A POST PLACEMENT ANALYSIS
Authors:   Walter Sisulu University, Department of Tourism and Hospitality Management, South Africa, RAMUKUMBA Takalani
Published: May 2021

The success of work-integrated learning (WIL) in academic activities is dependent on feedback from supervisors and the students themselves. Feedback from industry supervisors is crucial for the success of WIL activities in ac ademic qualifications. The purpose of this paper is to analyse the evaluations of supervisors of Lerotholi Polytechnic 2019 final year tourism students WIL and the evaluation of WIL by students themselves. This was done by supervisors evaluating the frequency with which they observed certain behaviour from the students. The evaluation questionnaire formed part of the final WIL report that the students submitted back to the institution upon completing the WIL program. The findings of this research indicate that overall observations by supervisors were consistently and often whilst from a student’s perspective, findings show that payment for WIL and gender affect aspects related to how they agreed or disagreed with statements in question.
The predictive powers of organizational trust and justice on enabling school structure: A structural equation modelling approach
Authors:   School of Foreign Languages, Niğde Ömer Halisdemir University, Niğde, Turkey, Arik Soner
Published: May 2021

Organizational structures are an important organizational variable affecting organizational behaviours and individuals' relationships with each other. The structural dimension of schools in terms of educational management is evaluated under two groups in the literature, namely, enabling and hindering school structures. Enabling school structures provide a healthy school climate and help schools be more effective. Individuals' perceptions of organizational trust and justice are also effective in ensuring a healthy school climate and school effectiveness. The aim of this study is to examine the predictive power of teachers' perceptions of organizational trust and justice on their perceptions of the enabling school structure. The structural equation model was used in the study, which is designed in the descriptive survey method. The study group is composed of 1187 teachers working at primary, secondary and high schools. Data were collected through Enabling School Structure Scale (Form-ESS), Organizational Justice Scale, Organizational Trust Scale and a Personal Information Form. The findings revealed that teachers' perceptions of organizational justice and organizational trust predict their perceptions about enabling school structure.
The frequency of excessive bacterial growth and the effectiveness of its treatment in patients with irritable bowel syndrome
Authors: Tkach S. M. , Dorofeev A. E. , Kuzenko Yu. G.
Published: May 2021

Objective — to study the frequency of the syndrome of intestinal bacterial overgrowth (SIBO) and to establish the effects of its eradication on the clinical course of various subtypes of the irritable bowel syndrome (IBS).
Materials and methods. The examinations in an open comparative randomized study involved 88 patients with IBS (35 men, 53 women) aged 26 to 56 years (mean age — 40 ± 14 years). The IBS diagnosis in all patients was established on the basis of Roma criteria IV. The IBS with diarrhea (IBS‑D) was established in the majority of patients (47 subjects, 53.4 %), a mixed subtype of IBS (IBS‑M) was revealed in 30 (34.1 %) patients, and IBS with constipation (IBS‑C) in 11 (12.5 %). The following IBS duration was defined: less than 5 years in 37 (42 %) of patients, 5 ‑ 10 years in 35 (39.8 %) subjects, more than 10 years in 16 (18.2 %) patients. The IBS course was mild in 30 (34.1 %) patients, mild to moderate in 45 (51.1 %) and severe disease was in 13 (14.8 %). The control group consisted of 30 clinically healthy people (18 women, 12 men, the mean age (33 ± 12) years).  Diagnosis of SIBO was performed using the H2‑breath test with lactulose (H2‑LDT).
Results. The overall frequency of SIBO detection (positive H2‑LDT) in patients with IBS (73.9 %) significantly exceeded its frequency in the controls (6.6 %, p < 0.005). The frequency of SIBO was significantly higher in IBS‑D and IBS‑M (78.7 % and 73.3 %, respectively) compared to IBS‑C (54.3 %, p < 0.005). Also, SIBO frequency was significantly higher in women with a history of the disease up to 5 years, in most patients a moderate course of IBS‑D was observed. The SIBO eradication after treatment with rifaximin was achieved in 73.8 % of cases, and eradication frequency in IBS‑D patients (78.4 %) significantly exceeded this parameter in patients with IBS‑C (66.6 %). Moreover, it was established that rifaximin at a dose of 1600 mg/day for 14 days was slightly more effective (eradication in 76.6 % of cases) than rifaximin at a dose of 1200 mg/day (eradication in 71.4 % of cases, p = 0.63).
Conclusions. The results of the study indicate that SIBO is very often present in patients with IBS, and its elimination is accompanied by an increase in both clinical and anti‑relapse effects. Rifaximin is an effective agent for the eradication of SIBO, and increase of its dosage (from 1200 mg/day to 1600 mg/day) correlates with some increase in clinical and antibacterial efficacy. Clinical improvement and reduction of recurrence rates after eradication of SIBO suggests that the latter may play a pathogenetic role in IBS.
Etiopathogenetic aspects of formation of functional diseases of the gastrointestinal tract: an emphasis on changes of intestinal permeability
Authors: Zhuravlyova L. V. , Shekhovtsova Yu. O.
Published: May 2021

Irritable bowel syndrome (IBS) and functional dyspepsia (FD) are known to be among the most common digestive pathologies. In present paper, the literature data have been analyzed related to the study of intestinal permeability disorders as an etiopathogenetic factor in the development of functional gastrointestinal diseases. The intestinal mucosa is a barrier, performing many functions, and above all a protective function, which is to prevent the transition of intrinsic substances into the internal environment of the body. Recently, more and more scientific evidence has been accumulating that impaired permeability of the intestinal mucosa is an important factor in the development and progression of functional diseases of the gastrointestinal tract, in particular, IBS and FD. In these pathologies, the weakening of the barrier function of the intestinal mucosa is observed, which is the result of changes in the number of proteins of tight cell contacts, which affects the change in permeability, thus stimulating the transition of pathogenic factors from the intestinal lumen into the intestinal mucosa and causing activation of immunocompetent cells. In the pathogenesis of IBS the main place is given to the activation of mast cells in the mucosa of both small and large intestine, and in FD — to mast cells and eosinophils of the duodenal mucosa. Mast cells, which are cells of the immune system, in response to activation, produce certain inflammatory cytokines, the action of which is aimed at changing the sensitivity of nerve endings in the mucosa, causing the phenomenon of visceral hypersensitivity and changes in the tone and motor function of the gastrointestinal tract.Correction of the changes in intestinal permeability of the gastrointestinal mucosa at this stage of development of medical science is potentially one of the pathogenetic areas in the treatment of IBS and FD. Необходимо провести исследования эффективности препаратов, влияющих на функционирование кишечной стенки, относительно нормализации кишечной проницаемости при заболеваниях ЖКТ. Further researches are needed to study the efficacy of medications affecting the functions of intestinal wall, in regards intestinal permeability at gastrointestinal diseases.
Kemampuan Pemecahan Masalah Matematika Ditinjau Dari Minat Belajar Peserta Didik
Authors: Yuliati Ikha
Published: May 2021

Kemampuan pemecahan masalah matematika peserta didik menjadi bekal dalam menghadapi perkembangan zaman saat ini, sementara minat belajar matematika peserta masih terbilang rendah. Penelitian ini bertujuan untuk mengetahui pengaruh minat belajar peserta didik terhadap kemampuan pemecahan masalah matematika peserta didik dan bagaimana hubungan antara minat belajar peserta didik terhadap kemampuan pemecahan masalah matematika. Penelitian dilakukan pada peserta didik kelas VIII MTs Daarul Hikmah Kota Tangerang Selatan dan MTs Mathlaul Anwar Kota Tangerang Selatan. Hipotesis penelitian yang diuji yaitu pengaruh minat belajar peserta didik terhadap kemampuan memecahkan masalah matematika dan hubungan antara minat belajar peserta didik dengan kemampuan pemecahan masalah matematika peserta didik. Penelitian dilakukan dengan metode korelasional dengan pendekatan kuantitatif. Analisis data menggunakan regresi linier dengan menggunakan penghitungan softwawe SPSS 23. Hasil pengujian hipotesis menyimpulkan bahwa terdapat pengaruh yang signifikan minat belajar peserta didik terhadap kemampuan pemecahan masalah matematika. Dibuktikan dengan sig. 0,000 <0,05 dan Fh = 203,459 > Ftab = 0,004. Oleh karena itu diperlukan peran aktif guru dan orang tua/wali murid untuk mengawasi minat belajar peserta didik guna meningkatkan keterampilan didik peserta didik dalam memecahkan persoalan matematika.