bluuebunny/crossref_metadata_2025_split huggingface dataset:
Histological, histochemical and ultrastructural study of slipped capital femoral epiphysis
Authors: Tresoldi I. , Modesti A. , Dragoni M. , Potenza V. , Ippolito E. 
Published: April 2017

Purpose The purpose of our study was to investigate the histological, histochemical and ultrastructural aspects of the proximal femoral growth plate in slipped capital femoral epiphysis (SCFE). Methods Eight core biopsies of the proximal femoral growth plate were performed during in situ epiphysiodesis in patients with SCFE that was at the pre-slipping stage in two cases and at the mild slipping stage (Southwick angle < 30°) in six cases. After fixation, the specimens were processed for either histological or histochemical or ultrastructural studies. Results The proximal femoral growth plate was thicker than normal in the SCFE cases, and the 3:1 ratio between the thickness of the resting zone and the other zones of the plate was reversed. Chondrocytes of the proliferating, maturation, hypertrophic and degenerating zones were arranged in large clusters rather than in columns, which were separated by loose fibrillary septae that appeared moderately alcian blue positive and metachromatic. The collagen fibrils of the longitudinal septae were uniformly thin, measuring about 200 Å, whereas in the normal plate collagen fibrils were in the range of 300 to 1200 Å in thickness. Chondrocytes were elongated and smaller than normal, with a dark cytoplasm. In the degenerating zone, mineralisation of the longitudinal and transversal septae was scanty and enchondral ossification was impaired, with a few small osteoblasts forming thin bone trabeculae on the cartilage septae of the degenerating zone. Conclusion In SCFE, the proximal femoral growth plate undergoes several histological, histochemical and ultrastructural changes that precede slipping of the epiphysis since they are already present at a pre-slipping stage of the disease. The loss of solidity of the extracellular matrix and the disarrangement of the normal architecture of the physis very likely cause the consequent slipping of the proximal femoral epiphysis. SCFE aetiology remains unknown.
Characterization of Natural Clays from Italian Deposits with Focus on Elemental Composition and Exchange Estimated by EDX Analysis: Potential Pharmaceutical and Cosmetic Uses
Authors: Iannuccelli Valentina , Maretti Eleonora , Sacchetti Francesca , Romagnoli Marcello , Bellini Alessia , Truzzi Eleonora , Miselli Paola , Leo Eliana 
Published: April 2017

AbstractPurification processes performed on natural clays to select specific clay minerals are complex and expensive and can lead to over-exploitation of some deposits. The present study aimed to examine physicochemical (mineralogy, morphology, size, surface charge, chemical composition, cation exchange capacity [CEC], and pH) and hydration (swelling, wettability, water sorption, and rheological behavior) properties of three native clays from Italian deposits for potential pharmaceutical and cosmetic uses due to the presence of phyllosilicate minerals. Particular emphasis was placed on energy dispersive X-ray (EDX) microanalysis coupled with the ‘cesium method’ to assay clay elemental composition and CEC. One bentonite of volcanic origin (BNT) and two kaolins, one of hydrothermal origin (K-H) and another of lacustrine-fluvial origin (K-L), were evaluated in comparison with a commercial, purified bentonite. The CEC assay revealed the complete substitution of exchangeable cations (Na+and Ca2+) by Cs+in BNT samples and CEC values consistent with those of typical smectites (100.64 ± 7.33 meq/100 g). For kaolins, partial substitution of Na+ cations occurred only in the K-L samples because of the interstratified mineral component which has small CEC values (11.13 ± 5.46 meq/100 g for the K-H sample and 14.75 ± 6.58 meq/100 g for the K-L sample). The degree of isomorphous substitution of Al3+by Mg2+affected the hydration properties of BNT in terms of swelling, water sorption, and rheology, whereas both of the poorly expandable kaolins exhibited significant water-adsorption properties. The EDX microanalysis has proved to be of considerable interest in terms of providing more information about clay properties in comparison with other commonly used methods and to identify the role played by both chemical and mineralogical composition of natural clays for their appropriate use in pharmaceutical and cosmetic fields.
Changes in the Use of It Technologies by Students of Agricultural Faculties
Authors: Lorencowicz Edmund , Koszel Milan , Kocira Sławomir , Uziak Jacek 
Published: April 2017

AbstractResearch on the selected population of students with a standardized questionnaire method concerning the use of IT technologies has been carried out since 2008/09. Results for the data from the first and the last year of research (2009 and 2016) for agricultural students were compared. It was reported that students use IT technologies in the process of learning. Majority of students − 94% (2009) and 98% (2016) positively assessed the usefulness of these technologies in the learning process. The Internet was used mainly for communication (respectively in the investigated years 82.5% and 99.1%). Usefulness of the Internet in the process of studying was marked very high - in 2009 it was 51% positive answers and in 2016 − 77%.
Energy Properties of Sunflower Seed Husk as Industrial Extrusion Residue
Authors: Maj Grzegorz , Krzaczek Paweł , Kuranc Andrzej , Piekarski Wiesław 
Published: April 2017

Abstract
The paper presents possibilities of using by ‒ products of the agri-food sector, in the form of sunflower husks, for energy purposes. Physical and chemical properties in the form of heat of combustion, calorific value for three moisture levels and ash content for two temperatures of combustion were determined and the carbon content (C), hydrogen content (H) and nitrogen content (N) were calculated pursuant to the PN-EN 15104 standard. Analysis of the heat of combustion and calorific value proved good energy properties of the investigated biomass. For the moisture level of 9%, 16%, 32% the heat of combustion was respectively 19.44 MJ∙kg-1, 17.94 MJ∙kg-1, 15.03 MJ∙kg-1, and the calorific value 18.09 MJ∙kg-1, 16.28 MJ∙kg-1, 13.16 MJ∙kg-1. The average ash content of the investigated biomass for the combustion temperature of 600°C and 815°C was respectively 2.12% and 2.04. In the analyzed biomass the nitrogen content was determined at the level of 1.57%, carbon of 43.87% and hydrogen of 6.29%.
Evaluation of Tribological Properties of Polymer Materials Used for Sliding Bearings in Agricultural Machinery
Authors: Walczak Mariusz , Caban Jacek , Marczuk Andrzej 
Published: April 2017

Abstract
The continuous technological development requires the use of modern materials also in agricultural engineering. Knowledge of the characteristics of tribological materials pairs cooperating with each other is useful for developing sliding nodes of agricultural machinery. Tribological properties of materials should be assessed for selection of technological materials beyond the economic criterion. The article presents analysis of the characteristics of tribological ball-on-disc wear of polymeric materials used as sliding elements for farm machines. Tribological tests were carried out under dry friction for a polymer-metal pair, and a wear rate and friction coefficient of the sample; the signs of wear were submitted to SEM observations.
Analysis of Force in MR Fluids during Oscillatory Compression Squeeze
Authors: Horak Wojciech , Sapiński Bogdan , Szczęch Marcin 
Published: April 2017

Abstract
This study investigates the behaviour of MR fluids in the oscillatory compression squeeze mode. Experiments were performed on commercially available MR fluids in the purpose-built experimental set-up. The influence of MR fluid’s properties and magnetic flux density on the force generated during the squeeze mode was investigated.
Transient Torsional Analysis of a Belt Conveyor Drive with Pneumatic Flexible Shaft Coupling
Authors: Kaššay Peter , Homišin Jaroslav , Urbanský Matej , Grega Robert 
Published: April 2017

AbstractDevelopment and application of pneumatic flexible shaft couplings have been in the center of our department research activities for a long time. These couplings are able to change torsional stiffness by changing pressure in their flexible elements – air bellows. Until now we have dealt with the use of pneumatic flexible shaft couplings for tuning mechanical systems working with periodically alternating load torque at steady state. Some mechanical systems, however, operate with a static load torque at constant speed (e.g. hoists, elevators, etc.), where it is necessary to consider the suitability of shaft coupling in terms of load torque at transient conditions (run-up and braking). Therefore we decided to analyze the use of pneumatic flexible shaft couplings also in this type of mechanical systems on an example of conveyor belt drive.
In situ TEM study of precipitation in a quasicrystal-strengthened AL-alloy
Authors: Bončina T. , Zupanič F. 
Published: April 2017

Abstract
Precipitation kinetics and mechanisms within an Al-Mn-Be-Cu quasicrystal strengthened alloy at 300°C were studied using in-situ transmission electron microscopy. The alloy was cast into a copper mould. Quasicrystalline precipitates formed throughout the Al-rich solid solution, whilst heterogeneous formations of Al2Cu and T-phase occurred on icosahedral quasicrystalline particles formed during solidification. The formation of quasicrystalline particles and T-phase was limited by manganese diffusivity, whilst that of Al2Cu by copper diffusivity. The precipitation produced only a small hardening effect.
Material factors in relation to development time in liquid-penetrant inspection. Part 3. Testing of model plates
Authors: Irek P. , Słania J. 
Published: April 2017

Abstract
The paper is the continuation of the previous ones entitled „Material factors in relation to development time in liquid-penetrant inspection. Part 1. Material factors“ and „Material factors in relation to development time in liquid-penetrant inspection. Part 2. Investigation programme and preliminary tests“ in which material factors influencing essentially the development time in penetrant testing as well as the range of their values have been specified. These factors are: material kind, surface roughness and imperfection width.
In the paper it has been described how far the development time in colour penetrant testing is influenced by an individual material factor. Moreover, it has been presented the equation being the function of material factors and development time.
Analysis of forming thin titanium panels with stiffeners
Authors: Adamus J. , Winowiecka J. , Dyner M. 
Published: April 2017

Abstract
The growing demand for light and durable products has caused an increase in interest in products formed of thin sheets. In order to ensure sufficient stiffness of the drawn - parts, stiffening is often performed. Unfortunately, during the forming of stiffeners unwanted deformations of the drawn parts very often appear, which prevent them from further exploitation. In the paper, forming thin titanium panels with stiffeners is analysed. The panels are made of sheets of commercially pure titanium: Grades 2, 3 and 4. In the results of numerical analyses which were performed using PamStamp 2G, taking into consideration the impact of the blank holder force and friction conditions on the strain distribution in the drawn parts, sheet thinning and springback values are presented. The numerical analysis results were compared with the experimental tests. It was concluded that in order to prevent panel deformation being a result of residual stresses, it is necessary to ensure adequate friction conditions on the contact surfaces between the deformed material and tools as well as a suitable blank holder force.
Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing
Authors: Roskosz S. 
Published: April 2017

Abstract
The aim of this paper is an assessment of the influence of hot isostatic pressing treatment on porosity of cast samples - turbine blades and vane clusters made of the IN713C superalloy. Two variants of HIP treatments, differing in pressure from each other, have been used.
The quantitative evaluation of the porosity was performed using light microscopy and quantitative metallography methods.
The use of the hot isostatic pressing significantly decreased the volume fraction and size of pores in the test blades, the remaining pores after the HIP process being characterized by a round shape. The increased pressure has caused significant reductions in the area fraction and size of the pores.
Utilisation of mould temperature change in eliminating the Al5FeSi phases in secondary AlSi7Mg0.3 alloy
Authors: Bolibruchová D. , Richtárech L. , Dobosz S. M. , Major-Gabryś K. 
Published: April 2017

Abstract
This article describes the impact of the metal mould temperature change in eliminating the adverse effect of iron in the AlSi7Mg0.3 alloy. The kind of phases based on iron to be formed in aluminium alloys is determined by the alloy chemical composition, the melt overheating temperature prior to casting, and the cooling rate during crystallisation. In the experiment, we used three various mould temperatures, and their impact on the possible change in the adverse Al5FeSi phase, excreted in a needle form to a more compact form of Chinese writing or skeleton units. The experimental part did not use melt overheat that would result in impairment of the melt, for example due to increased gassing of the melt, as well as in a greater load on the smelting unit, thus resulting in increased energy expenditure. We can conclude from the obtained results that the mould temperature change does not have an adequate effect in eliminating the adverse effect of iron in Al-Si-Mg alloys.
Reinforcing cast iron with composite insert
Authors: Dulska A. , Studnicki A. , Szajnar J. 
Published: April 2017

Abstract
The paper presents a proprietary method of making composite cast iron (eutectic) locally reinforced with ceramics. The research included making casts with a ceramic layer, its percentage of the surface was 30%. The research included abrasive wear resistance according to ASTM G 65-00. As a result of the research it has been found that the infiltration of the molten metal into the ceramic preform mainly affects the correct production of the cast with local reinforcement. The research results also have proven that the application of a lattice ceramic insert placed in the mould is the most appropriate option, due to the even distribution of the particles in the cast and obtaining a sound cast.
Shaping optimal zinc coating on the surface of high-quality ductile iron casting. Part II – Technological formula and value of diffusion coefficient
Authors: Kopyciński D. , Guzik E. , Szczęsny A. 
Published: April 2017

Abstract
The completed research presented in the first part of the article has allowed linking the manufacturing technology of ductile iron castings with the process of hot dip galvanizing. On the basis of these data simulations were carried out to examine the behaviour of zinc diffusion coefficient D in the galvanized coating. The adopted model of zinc coating growth helped to explain the cases of excessive growth of the intermetallic phases in this type of coating. The paper analyzes covered the relationship between the roughness and phase composition of the top layer of product and the thickness and kinetics of zinc coating growth referred to individual sub-layers of the intermetallic phases.Roughness and phase composition in the surface layer of product were next related to the diffusion coefficient D examined in respective sublayers of the intermetallic phases.
Silver Matrix Composite Reinforced by Aluminium-Silver Intermetallic Phases
Authors: Wloch G. , Skrzekut T. , Sobota J. , Woznicki A. , Błaż L. 
Published: April 2017

AbstractSilver and aluminum powders (82 mass % Ag and 18 mass % Al) were mixed and hot extruded at 673 K with extrusion ratio λ = 25. Performed X-ray diffraction analysis of as extruded rod revealed the development of Ag3Al and Ag2Al-type intermetallic phases. Structural observations and both chemical and diffraction analysis of structural components confirmed the growth of mentioned phases in the vicinity of elementary Al and Ag granules. No pores or voids were observed in the material. Mechanical properties of the composite, UTS = 490MPa, YS = 440 MPa, HV2 = 136, were relatively high if compared to commercial Ag and Cu products. Hot compression tests pointed to the good hot workability of the composite at deformation temperature range 473 K - 773 K.The differential scanning calorimetry tests were performed in order to estimate structural processes during heating of Ag/Al composite that lead to thermodynamically stable liquid state. It was found that characteristic temperature of three endothermic peaks correspond to (1) peritectoid transformation μ-Ag3Al → ζ-Ag2Al + (Ag), (2) the eutectic melting ζ-Ag2Al + (Al) → L, (3) melting of the ζ-Ag2Al phase.The Vickers hardness of the samples annealed at 673 K, for the time range up to 6900 minutes, was also determined. It was concluded that mutual diffusion of elements between Ag and Al granules and the growth of μ-Ag3Al and ζ-Ag2Al grains during annealing at 673 K result in a slight hardening of the composite.
Properties on a subclass of univalent functions defined by using a multiplier transformation and Ruscheweyh derivative
Authors: Alb Lupaş Alina 
Published: April 2017

Abstract
In this paper we have introduced and studied the subclass ℛ𝒥 (d, α, β) of univalent functions defined by the linear operator

RI

n
,
λ
,
l

γ

f
(
z
)

$RI_{n,\lambda ,l}^\gamma f(z)$

defined by using the Ruscheweyh derivative Rnf(z) and multiplier transformation I (n, λ, l) f(z), as

RI

n
,
λ
,
l

γ

:
𝒜
→
𝒜

$RI_{n,\lambda ,l}^\gamma :{\cal A} \to {\cal A}$

,

RI

n
,
λ
,
l

γ

f
(
z
)
=
(
1
−
γ
)

R
n

f
(
z
)
+
γ
I
(
n
,
λ
,
l
)
f
(
z
)

$RI_{n,\lambda ,l}^\gamma f(z) = (1 - \gamma )R^n f(z) + \gamma I(n,\lambda ,l)f(z)$

, z ∈ U, where 𝒜
n
={f ∈ ℋ(U) : f(z) = z + an

+1
zn

+1 + . . . , z ∈ U}is the class of normalized analytic functions with 𝒜1 = 𝒜. The main object is to investigate several properties such as coefficient estimates, distortion theorems, closure theorems, neighborhoods and the radii of starlikeness, convexity and close-to-convexity of functions belonging to the class ℛ𝒥(d, α, β).
A simulation algorithm for a single server retrial queuing system with batch arrivals
Authors: Florea Ion , Nǎnǎu Corina-Ştefania 
Published: April 2017

Abstract
Many systems of real word are modeled by retrial queuing system with batch arrivals. Analytical formulas for this class of systems are complicated and address only particular cases. The paper presents a study approach for this kind of systems, based on discrete event simulation. It is shown that the given algorithm has a polynomial complexity. Also, the object-oriented design we used for implementation is sketched.
A novel approach of the conformal mappings with applications in biotribology
Authors: Florea Olivia 
Published: April 2017

Abstract
In this paper, the flow of an incompressible non Newtonian fluid between two eccentric cylinders is considered. The aim of this study is to determine the flow in the case of the stationary movement of some viscous fluids between two eccentric cylinders with the generators parallel with Oz axis. Using the Mobius conformal mapping are obtained two concentric cylinders. The expression of velocity is deduced with the separation of variable method.
Measurability of Social Development. Reflections on the Applicability of Social Progress Indices with Reference to Brexit
Authors: Ivanyos János , Sándor-Kriszt Éva 
Published: April 2017

Abstract
The question is how the global and local economic actors’ innovation-based local social and environmental objectives and results can modify the social cohesion strategies, how the disparities in economic and social development can be measured and evaluated at regional level in addition to a comparison across countries. We have seen that any one indicator in itself is not enough since it does not provide sufficient explanation for either the development disparities or their reasons. Anyway, in addition to GDP per capita, it is worth applying - and it is important to apply - such indicators as SPI and Well-Being, and various indices of social progress.
Fast Matrix Multiplication with Big Sparse Data
Authors: Somasekhar G. , Karthikeyan K. 
Published: April 2017

Abstract
Big Data becameabuzz word nowadays due to the evolution of huge volumes of data beyond peta bytes. This article focuses on matrix multiplication with big sparse data. The proposed FASTsparse MULalgorithm outperforms the state-of-the-art big matrix multiplication approaches in sparse data scenario.
A Two-Stage Placement Algorithm with Multi-Objective Optimization and Group Decision Making
Authors: Borissova Daniela , Mustakerov Ivan 
Published: April 2017

Abstract
Atwo-stage placement algorithm with multi-objective optimization and group decision making is proposed. The first stage aims to determineaset of design alternatives for objects placement by multi-objective combinatorial optimization. The second stage relies on business intelligence via group decision-making based on solution of optimization task to makeachoice of the most suitable alternative. The design alternatives are determined by means of weighted sum and lexicographic methods. The group decision making is used to evaluate determined design alternatives toward the design parameters. The described algorithm is used for wind farm layout optimization problem. The results of numerical testing demonstrate the applicability of the proposed algorithm.
Empirical Study of Job Scheduling Algorithms in Hadoop MapReduce
Authors: Gautam Jyoti V. , Prajapati Harshadkumar B. , Dabhi Vipul K. , Chaudhary Sanjay 
Published: April 2017

Abstract
Several Job scheduling algorithms have been developed for Hadoop-Map Reduce model, which vary widely in design and behavior for handling different issues such as locality of data, user share fairness, and resource awareness. This article focuses on empirically evaluating the performance of three schedulers: First In First Out (FIFO), Fair scheduler, and Capacity scheduler. To carry out the experimental evaluation, we implement our own Hadoop cluster testbed, consisting of four machines, in which one of the machines works as the master node and all four machines work as slave nodes. The experiments include variation in data sizes, use of two different data processing applications, and variation in the number of nodes used in processing. The article analyzes the performance of the job scheduling algorithms based on various relevant performance measures. The results of the experiments are evident of the performance being affected by the job scheduling parameters, the type of applications, the number of nodes in the cluster, and size of the input data.