bluuebunny/crossref_metadata_2025_split huggingface dataset:
Risk management of emergence of dangerous events on the basis of three-planimetric model of reliability of technological systems
Authors: Serdyuk Vitalij , Denisova Elena , Kolpakova Tatiana , Utuganova Valentina , Kovalkovskay Nadezhda 
Published: June 2019

Abstract
The reliability of machine-building industry technological systems of is determined by the risks of hazardous events: failures of technological equipment, production items, executors of specified technological processes. The paper proposes the use of the G. Heinrich pyramid, built on the basis of the risks of technological system failures, which include primary failure, secondary failure, initiated failures, multiple failure, necessary to determine the significance of the influence of failure risks on the possibility of dangerous events. This is necessary for the organization of safe working conditions for workers through risk management of hazardous events based on a three-planimetric model for managing the reliability of technological systems. The authors have developed a three-planimetric model for managing the reliability of technological systems. The incident management process takes place on the first contour. According to the analysis of the statistics of incidents, the failure factors are managed on the second contour of the model. The third contour is process functionality management. The contours use the “Analytics” database, updating it and the database of possible options for technical solutions with the subsequent adjustment of operating conditions or methods for managing failure risks. Based on the obtained statistical information databases, solutions are being developed to manage the indicated risks of dangerous failures of technological systems. The control contour is closed in the cycle of technological system functioning and its risk management. Automation of the management process can be achieved through the use of resources of a machine-building organization and the development of an information management system for a unified technical condition monitoring system (UTCMS) based on the use of the three-planimetric control system.
Summertime thermal regime of water downstream of the Krasnoyarsk hydroelectric power plant
Authors: Shaparev N Ya , Bondarenko E V 
Published: June 2019

Abstract
Summertime hydrothermal regime of the Yenisei River downstream of the Krasnoyarsk hydroelectric power plant is modeled based on a deterministic approach. To that end, the Fourier equation is used and the following physical processes contributing to the heat exchange between water and the surroundings are taken into consideration: absorption of direct and scattered solar radiation by water, absorption of downwelling thermal infrared radiation from the atmosphere by water surface, thermal infrared radiation back from the water surface, convection of heat and heat loss due to evaporation of water. A clearskies river thermal regime under no wind is studied in a 124-km stream reach below the power plant and the obtained results are compared against temperatures recorded at gauging stations.
Restoring of worn-out parts of electrical machines via compositional electrochemical iron-corundum coating
Authors: Panteleev V I , Petukhov R A , Sizganova E Yu 
Published: June 2019

Abstract
Galvanic build-up of iron layer is an effective method of parts restoring during repair works. The productivity of this process is 15-20 times higher than of chroming. The high settling velocity of iron and low costs of the source material determine the economic practicability of this method. Up to 3 mm can be applied by iron plating, which is necessary in case of high parts wear.
Sectional approach to researching of two-phase BLDC motor
Authors: Krivilev A V , Dunich E A , Penkin S S 
Published: June 2019

Abstract
An approach to researching of two-phase brushless DC motor,based on winding’s section is proposed. A classification of control methods by section connectionkind and commutation methods is developed. An example in case of independent windings’ layout is given.Torque-speed curves are obtained. A comparative analysis of them is carried out and recommendations to drive systems’ developers are given.
Quality control of the concrete and corrosion damage of cables of prestressing reinforcement of KA beams, bridge in Chomutov
Authors: Rehacek S , Citek D , Krystov M , Kolisko J 
Published: June 2019

Abstract
The aim of this paper is to assess the condition of the diagnosed bridge structure, at which previous bridge inspections identified corrosion damage of cables of prestressing reinforcement of KA beams, to assess the extent of corrosion damage of prestressing reinforcement, the condition of chloride ions in concrete of the bearing structure, and to draw up a detailed corrosion assessment of the prestressing reinforcement, then to propose a possible method of the bridge renovation with partial use of new materials (UHPC).
The impact of aggregates from recycling, discharge time and mixing technique on the consistency of concrete
Authors: Sicakova A , Urban K 
Published: June 2019

Abstract
Concretes prepared by the application of the triple mixing approach and by the use of both recycled concrete aggregate (RCA) and recycled clay brick aggregate (RBA) were tested in terms of loss of consistency. Fly ash was used to improve the performance of recycled aggregates during mixing – this is a specific aspect of the triple-mixing method. The slump test was performed immediately after mixing, as well as after next 90 minutes. The results were evaluated from the point of view of prolonged discharge time. Concrete consistency changes with time, having the impact on technological processes at construction site. Over the discharge time, the RBA-based concrete achieved the worst result – by 87% slump loss. Discharge time influenced the slump loss more favourably in the case of normal mixing and in the case of using natural aggregate (NA). The substitution of NA with both the RCA and RBA caused the slump loss turned worse, while RCA provided better results than RBA. However, the substitution of NA with both RCA and RBA resulted in more favourable change in the slump loss when concrete was mixed by 3M method.
Wood pulp as a potential raw material source for manufacturing bio-based building materials
Authors: Stevulova N , Hospodarova V , Vaclavik V , Dvorsky T 
Published: June 2019

Abstract
The application of bio-based material such as cellulose fibres derived from renewable source to cement mortars was investigated and the properties of fresh mixtures and hardened mortars were characterized. The mixtures composition consisted of combined addition of the selected kind of cellulose fibres (bleached wood pulp) and superplasticizer (polycarboxylate ester). The aim was to produce a cement mortar with the improved properties for indoor application. The 0.5 wt.% fibre addition (from weight of filler and binder) and superplasticizer dosage of 1% in the mixtures were used. Reference cement mortar did not contain cellulose fibre and superplasticizer. The comparative study of the fresh fibre cement mixture properties has been showed worse flowability behaviour of mixture with plasticizer, as expected. The the beneficial effect of the superplasticizer was not proven even on the compressive and flexural strength of fibre cement mortars after 7, 28 and 90 days of hardening. The performances of the mortars were dependent not only on fibres and superplasticizer nature but also on the organic/inorganic interface.
Testing and mechanical properties of high strength concrete
Authors: Sucharda O , Bilek V , Mateckova P 
Published: June 2019

Abstract
The paper deals with mechanical properties of high-strength concrete, which are illustrated in various laboratory tests. The aim of the paper is to compare the possibilities of concrete compressive and tensile strength assessment and modulus of elasticity assessment. Results of nine type laboratory tests are presented in summary. Tested material properties are complemented with testing of small structural element, the beam without shear reinforcement. The behaviour of structural element is analysed also with a non-linear numerical model that respects the quasi-brittle properties of the concrete, where fracture-plastic model for concrete is used.
Effect of aggregate gradation on lime mortars rheology
Authors: Vyšvařil M , Vozák R 
Published: June 2019

Abstract
The influence of basalt, limestone, and quartz aggregate and their various gradation on rheological properties of air lime mortars with constant water/binder ratio and binder/aggregate ratio is monitored in this work. It was found that the rheology of fine-grained lime mortars is influenced not only by the shape of the aggregate, but also by its granulometry, especially by the content of fines. The lime mortars with basalt, limestone or quartz aggregate are shear-thinning non-Newtonian liquids. Their shear stress, yield stress, and flow index decrease with increasing aggregate fraction. The viscosity of lime mortars is markedly influenced by the amount of lime matrix. The lime mortars with quartz and limestone aggregate are rheopectic suspensions.
Influence of glass and polymer fibres on physical and mechanical properties of cement composites
Authors: Štefunková Z , Ledererová M , Cápayová S , Gregorová V 
Published: June 2019

Abstract
This paper focused on the effects of using glass and polypropylene fibres in cement mortars. Were used glass fibres Cem-FIL Anti-Crak HP 12mm long and polymer fibres BeneSteel 55 (shortened to 12mm) in 1wt.%, 3wt% and 5wt% of cement. The water and filler dose were constant. Tests were performed on 40x40x160mm beams. From the results we have found that by the addition of fibres, the shrinkage of hardened cement composites is eliminated, with the use of polymeric fibres for better results. The filaments also positively influenced tensile strength at bending. By adding the fibres, the consistency of the fresh mortar deteriorates, and the bulk density of fresh and hardened mortars decreases, resulting in less compressive strength.
Threshold of the chloride to hydroxide ions ratio in relation to steel reinforcement corrosion
Authors: Rovnaníková P , Vořechovská D 
Published: June 2019

Abstract
A simple method for determining the corrosion dependence of steel reinforcement on the content of chloride and hydroxide ions is described. Steel test specimens were immersed for nine months in solutions with 0.03%, 0.3% and 3% NaCl with increasing concentrations of hydroxide ions, and pH of 8.5 to 13. The test specimens were cleaned of corrosion products and weighed at given time intervals of one month. The dependence of mass loss expressed as a percentage of the concentration of chloride and hydroxide ions was determined. The concentration threshold of the cCl−/cOH− ratio of 0.5 was evaluated from the results. Higher values of this ratio resulted in the formation of corrosion products on the surface of the test specimens.
Study of temperature influence of cement and water on the fresh cement paste consistency
Authors: Figmig R , Estokova A 
Published: June 2019

Abstract
The consistency of a fresh cement paste, which is formed after mixing Portland cement with water, depends significantly on the water to cement ratio (w/c), the cement fineness and its composition, but also on the other parameters as temperature of cement and water. The paper is focused on researching the influence of increased temperature of cement and water on the fresh cement paste consistency. Various cement pastes with different w/c ratio (0.28, 0.32 and 0.36) and different temperatures of water and cement (20±2°C, 40°C, 60°C) were investigated. The consistency of cement paste was measured by Vicat roller penetration method. The tendency of losing the consistency of the fresh cement paste with increasing of its temperature was observed and exhibited as linear correlation with the coefficient of determination R2(0.28) = 0.9695 and R2(0.32) = 0.9147 respectively.
The issue of plastic waste in the environment and its possible uses as a substitute for filler in lightweight concrete
Authors: Ledererová M , Štefunková Z , Gregorová V , Urbán D. 
Published: June 2019

Abstract
The specific nature of plastics causes specific problems in waste management. Plastics are relatively inexpensive and versatile with the potential for versatile use in industry, which has led to their rapid development over the past century, which still persists. The aim is to look for the possibility of reusing plastic waste as one of the lightweight filler fillers. It used plastic recycled material recycled from EVA plastic packaging and polystyrene recycled material in various proportions. All are among the medium-recyclable plastics according to their recycling rate. The experimental part of the work is devoted to the verification of the effect of the filler dose on the monitored physical and sound absorption parameters.
Assessment of the resistance of ventilated facade system by vacuum testing
Authors: Schmid P , Daněk P , Rozsypalová I , Holomek P , Juránek P 
Published: June 2019

Abstract
The aim of this research was to determine experimentally the mechanical resistance of preset ventilated facade systems exposed to wind suction. In accordance with the European ETAG 034 Guideline, Part 1, seven facade assemblies were tested. The wind suction load was simulated in a vacuum test in the AdMaS centre using the universal vacuum loading system. The test was performed with a load increasing in increments, where after each level, the specimens were unloaded. The effect of the density of connections of load-bearing plates with the structure of subframes was demonstrated. Further, the resistance to wind suction of specimens with timber subframe was slightly higher than that of specimens with aluminium subframe.
Test of the tensile load capacity of a timber structure joint with an inserted nail plate
Authors: Schmid P , Daněk P , Rozsypalová I , Plaček V 
Published: June 2019

Abstract
The aim of this paper was to determine the axial tensile load capacity of timber structure elements with inserted metal plates with welded nails. The tests were performed on three specimens in the laboratory of the AdMaS centre of the Faculty of Civil Engineering, Brno University of Technology. The tensile force was applied on the specimen by increasing the force up to the specimen failure. The inductive displacement transducers continuously measured the displacement of the inserted joint plates with regard to timber prisms. The tensile load-bearing capacity of the tested joint was determined at 205.0 kN. Due to the advantages, the tested joints with inserted nail plates seem to be appropriate for joining suitable timber elements.
Comparison of material properties of steel fiber reinforced concrete with two types of steel fiber
Authors: Marcalíková Z , Procházka L , Pešata M , Boháčová J , Čajka R 
Published: June 2019

Abstract
The work is focused on the area of mechanical properties of two types of Steel Fibers for reinforced concrete. In both cases, the same concrete mixture is used. The Steel Fibers used differ in shape. The first one is short and straight fiber and the second one is 3D steel fiber. Steel Fiber Reinforced Concrete was prepared at a dosage of 40 and 75 kg steel fibers/m3. The experiment includes determination of strengths, concretely compressive strength, a three-point flexural test and Splitting Tensile Strength test. The results are summarized; fracture mechanics parameters necessary for structural modeling are also included.
Moisture sorption and thickness swelling of wood-based materials intended for structural use in humid conditions and bonded with melamine resin
Authors: Böhm M , Kobetičová K , Procházka J , Černý R 
Published: June 2019

AbstractWhen used in construction, the properties of wood-based materials they are mainly affected by moisture. Moisture sorption and the associated swelling has an impact on the resistance of materials to biocidal attacks, on their mechanical properties or air permeability, and on comfort of use and durability of the structure. Equilibrium moisture content (EMC) and thickness swelling (TS) depending on the relative humidity for plywood (PW), particleboard (PB) and oriented strand board (OSB), for load-bearing purposes in humid environments and bonded with melamine-urea-formaldehyde resin (MUF), are studied in detail in this paper. Equilibrium moisture content and thickness swelling are influenced by the type of material, density, quantity of adhesive composition, and paraffin. The highest values of equilibrium moisture content were found in plywood, whilst the highest thickness swelling was achieved by OSB. A high dependency of nonrecoverable thickness swelling on the equilibrium moisture of the material was also ascertained. The proportion of nonrecoverable thickness swelling increases exponentially, in particular if the material’s equilibrium moisture content exceeds 12%.
Experimental study of the modulus of elasticity of concrete at different ambient temperature
Authors: Bujnakova P , Jost J , Farbak M , Kotes P 
Published: June 2019

Abstract
The structural performance of concrete construction and bridges is directly influenced by the strength and the modulus of elasticity of concrete. The modulus of elasticity is an input parameter to the creep compliance important especially in design calculation of large concrete bridges. The development of strength and modulus of elasticity at the early ages depends also on the temperature of the environment during casting and curing of concrete. The effect of ambient temperature on modulus of elasticity is however not assessed by the EN 1992-1-1 [1]. The experimental program was focused on determination of static modulus of elasticity and compressive strength cast and cured at ambient temperature +20°C and temperature -5°C at different time. The paper also formulates preliminary design recommendations applicable in practice.
Update on Neuroendocrine Carcinomas of the Larynx
Authors: Strosberg Carolina , Ferlito Alfio , Triantafyllou Asterios , Gnepp Douglas R , Bishop Justin A , Hellquist Henrik , Strojan Primoz , Willems Stefan M , Stenman Göran , Rinaldo Alessandra , Hernandez-Prera Juan C 
Published: June 2019

AbstractObjectivesLaryngeal neuroendocrine carcinomas are heterogeneous neoplasms characterized by neuroendocrine differentiation. Their prognoses are dependent on tumor type, therefore different classifications have been developed. Moreover, other tumors have overlapping pathologic features posing a range of diagnostic possibilities.MethodsA review of the literature was performed to comprehensively understand the classification and diagnosis of these tumors.ResultsWe review the past and present classification systems, with emphasis to the latest 2017 World Health Organization Classification of Head and Neck Tumors. We highlight salient clinicopathologic features and discuss the presumptive etiologic role of human papilloma virus. We share a practical algorithmic approach to the diagnosis of suspected neuroendocrine neoplasms of the larynx including a novel marker for neuroendocrine differentiation, insulinoma-associated protein 1.ConclusionsAccurate diagnosis and grading of laryngeal neuroendocrine carcinomas is critical for prognostication and therapeutic decision making. The use of an algorithm is instrumental in assuring the exclusion of mimickers.
Association Between Intra-arterial Invasive Central and Peripheral Blood Pressure and Endothelial Function (Assessed by Flow-Mediated Dilatation) in Stable Coronary Artery Disease
Authors: Park Kyoung-Ha , Park Woo Jung , Han Sang Jin , Kim Hyun-Sook , Jo Sang Ho , Kim Sung-Ai , Suh Sang Won 
Published: June 2019

Abstract

Background
Endothelial function is an independent predictor of coronary artery disease (CAD) and is regulated by a number of factors, including blood pressure.

Objectives
The current study was designed to test the hypothesis that intra-arterial invasive central blood pressure is strongly associated with endothelial function in patients with CAD.

Methods
In patient with CAD (diameter stenosis ≥30%), invasive central (aortic) and left peripheral (brachial) blood pressures were determined during transradial coronary angiography. The endothelial function was evaluated by way of flow-mediated dilatation (FMD) of the brachial artery.

Results
We enrolled 413 consecutive patients. There were 260 patients with significant CAD (sCAD, diameter stenosis ≥50%) and 153 patients with nonsignificant CAD (nsCAD, diameter stenosis &lt;50% and ≤30%). FMD was significantly and inversely correlated with central and peripheral parameters in terms of systolic blood pressure, mean arterial pressure, and pulse pressure (PP) (r = −0.332, r = −0.184, and r = −0.407, respectively, all P &lt; 0.001) and (r = −0.303, r = −0.190, and r = −0.319, respectively, all P &lt; 0.001). Compared with sCAD, there was closer correlation between central PP with FMD in nsCAD (r = −0.548 vs. r = −0.345, both P &lt; 0.001). After adjusting potential confounders such as age, body mass index and high-sensitivity C-reactive protein, multivariate analysis showed that FMD remained independently associated with central PP, degree of coronary artery stenosis, and brachial-ankle pulse wave velocity in all patients. In patients with nsCAD, the multivariate analysis showed that only central PP was independently correlated with FMD.

Conclusions
In patients with stable CAD, a decline in endothelial function is most closely associated with invasive central pulse pressure.
Whole-Body Vibration Associated with Dozer Operation at an Australian Surface Coal Mine
Authors: Lynas Danellie , Burgess-Limerick Robin 
Published: June 2019

AbstractBulldozers are used extensively on surface mine sites and have been previously identified as being associated with high amplitude whole-body vibration exposures. Previous investigations of this equipment have involved either a very small number of measurements, or measurements of very short duration (or both); or the data obtained were incompletely reported. This research reports 69 measurements (median duration 440 min) obtained from 15 different dozers during operation at a surface coal mine. More than one-third of vertical vibration measurements exceeded the ISO2631.1 Health Guidance Caution Zone when expressed as VDV(8). Considerable variability in measurement amplitudes was found. This was also true within measurements obtained from the same dozers on different shifts suggesting, by a process of elimination, that the remaining variability in whole-body vibration amplitude is a function of some combination of task characteristics, geology, and operator behaviour; rather than equipment-related variability, such as maintenance, suspension, seating, or track design. Short-comings in the evaluation methods provided by ISO2631.1 are highlighted.