bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Heat Treatment on Machining Properties of the AlSi9Cu3(Fe) Alloy
Authors: Wieroński P. , Pezda J. , Ponikwia Ł. 
Published: September 2016

Abstract
Automation of machining operations, being result of mass volume production of components, imposes more restrictive requirements concerning mechanical properties of starting materials, inclusive of machinability mainly. In stage of preparation of material, the machinability is influenced by such factors as chemical composition, structure, mechanical properties, plastic working and heat treatment, as well as a factors present during machining operations, as machining type, cutting parameters, material and geometry of cutting tools, stiffness of the system: workpiece – machine tool – fixture and cutting tool.
In the paper are presented investigations concerning machinability of the EN AC-AlSi9Cu3(Fe) silumin put to refining, modification and heat treatment. As the parameter to describe starting condition of the alloy was used its tensile strength Rm. Measurement of the machining properties of the investigated alloy was performed using a reboring method with measurement of cutting force, cutting torque and cutting power. It has been determined an effect of the starting condition of the alloy on its machining properties in terms of the cutting power, being indication of machinability of the investigated alloy. The best machining properties (minimal cutting power - Pc=48,3W) were obtained for the refined alloy, without heat treatment, for which the tensile strength Rm=250 MPa. The worst machinability (maximal cutting power Pc=89,0W) was obtained for the alloy after refining, solutioning at temperature 510 °C for 1,5 hour and aged for 5 hours at temperature 175 °C. A further investigations should be connected with selection of optimal parameters of solutioning and ageing treatments, and with their effect on the starting condition of the alloy in terms of improvement of both mechanical properties of the alloy and its machining properties, taking into consideration obtained surface roughness.
Quality Evaluation of Remelted A356 Scraps
Authors: Yuksel C. , Tamer O. , Erzi E. , Aybarc U. , Cubuklusu E. , Topcuoglu O. , Cigdem M. , Dispinar D. 
Published: September 2016

AbstractA356 is one of the widely used aluminium casting alloy that has been used in both sand and die casting processes. Large amounts of scrap metal can be generated from the runner systems and feeders. In addition, chips are generated in the machined parts. The surface area with regard to weight of chips is so high that it makes these scraps difficult to melt. Although there are several techniques evolved to remedy this problem, yet the problem lies in the quality of the recycled raw material. Since recycling of these scrap is quite important due to the advantages like energy saving and cost reduction in the final product, in this work, the recycling efficiency and casting quality were investigated. Three types of charges were prepared for casting: %100 primary ingot, %100 scrap aluminium and fifty-fifty scrap aluminium and primary ingot mixture were used. Melt quality was determined by calculating bifilm index by using reduced pressure test. Tensile test samples were produced by casting both from sand and die moulds. Relationship between bifilm index and tensile strength were determined as an indication of correlation of melt quality. It was found that untreated chips decrease the casting quality significantly. Therefore, prior to charging the chips into the furnace for melting, a series of cleaning processes has to be used in order to achieve good quality products.
The use of IR thermography to show the mold and part temperature evolution in injection molding
Authors: Bula Karol , Różański Leszek , Marciniak-Podsadna Lidia , Wróbel Dawid 
Published: September 2016

Abstract
This study concerns the application of infrared camera for injection molding analysis by measuring temperatures of both injection molded parts and injection mold cavities in a function of injection cycles. The mold with two cavities, differing in thickness (1 and 3 mm), and a cold direct runner was used. Isotactic polypropylene homopolymer was utilized to produce parts. Mold temperature was set at 22°C and controlled by a water chiller. Five measuring points were determined: SP1, SP2 (placed in the 3 mm cavity), SP3, SP4 (located in the 1 mm cavity) and SP5 around an injection molding gate. Our investigations showed that the highest temperature is localized around SP2 point and the lowest at SP4. Also, it was proved that even after 62 injection molding cycles, temperatures of cavities were not stable, revealing their further increase with each cycle.
Spacelike Graphs of Prescribed Mean Curvature in the Steady State Space
Authors: López Rafael 
Published: September 2016

Abstract
We study the Dirichlet problem of the constant mean curvature equation in the steady state space over a bounded domain of a slice. Under suitable conditions on the convexity of the domain, we prove the existence of a spacelike graph with constant mean curvature H, with

-
1

≤
H
<
0

${-1\leq H<0}$

, and constant boundary values.
Influence of RC Element Wiring in Electrical Circuit on Electromechanical Thermostat Contact Wear
Authors: Haas Peter , Kadnár Milan , Rusnák Juraj , Tóth František , Nógli Dušan 
Published: September 2016

Abstract
Contact wear caused by electric arc during electric contact make (cut-in) and break (cut-out) has the direct impact on the contact lifetime. The RC element wired parallelly to the contact will eliminate or reduce the arcing and subsequently extend the lifetime. Comparative tests of the two sets of identical Danfoss 077B electromechanical thermostats have been carried out. In the first batch, standard thermostats were tested. In the second batch, the same thermostat types, but with RC elements wired parallel to thermostats main contacts were tested. Measurement has not proven any improvement of the contact wear. Temperature drift and change of the critical dimension caused by contact wear were very similar in the both cases. Thus, the application of RC element is considered not reasonable measure for reduction of contact wear of electromechanical thermostats.
Factorizations in preduals associated to ρ-contractions
Authors: Chevreau Bernard , Crăciunescu Aurelian 
Published: September 2016

Abstract
We establish directly factorization results for classes of ρ-contractions, corresponding to those obtained for certain classes of contractions. As an example of result which is not an immediate consequence of the fact that any ρ-contraction is similar to an ordinary contraction we give an "optimal" characterization of absolutely continuous ρ-contractions whose associated functional calculus has Property (Aא₀). Along the way we show that a ρ-contraction is absolutely continuous if and only if it admits an absolutely continuous unitary ρ-dilation generalizing a well- known result for usual contractions.
Regularity properties and integral inequalities related to (k; h1; h2)-convexity of functions
Authors: Cristescu Gabriela , Găianu Mihail , Muhammad Uzair Awan 
Published: September 2016

Abstract
The class of (k; h1; h2)-convex functions is introduced, together with some particular classes of corresponding generalized convex dominated functions. Few regularity properties of (k; h1; h2)-convex functions are proved by means of Bernstein-Doetsch type results. Also we find conditions in which every local minimizer of a (k; h1; h2)-convex function is global. Classes of (k; h1; h2)-convex functions, which allow integral upper bounds of Hermite-Hadamard type, are identified. Hermite-Hadamard type inequalities are also obtained in a particular class of the (k; h1; h2)- convex dominated functions.
Fuzzy Riesz subspaces, fuzzy ideals, fuzzy bands and fuzzy band projections
Authors: Hong Liang 
Published: September 2016

Abstract
Fuzzy ordered linear spaces, Riesz spaces, fuzzy Archimedean spaces and σ-complete fuzzy Riesz spaces were defined and studied in several works. Following the efforts along this line, we define fuzzy Riesz subspaces, fuzzy ideals, fuzzy bands and fuzzy band projections and establish their fundamental properties.
Strong convergence of the Ishikawa iteration for Lipschitz α-hemicontractive mappings
Authors: Osilike Micah Okwuchukwu , Onah Anthony Chibuike 
Published: September 2016

Abstract
A new class of α-hemicontractive maps T for which the strong convergence of the Ishikawa iteration algorithm to a fixed point of T is assured is introduced and studied. The study is a continuation of a recent study of a new class of α-demicontractive mappings T by L. Mărușter and Ș. Mărușter, Mathematical and Computer Modeling 54 (2011) 2486-2492 in which they proved strong convergence of the Mann iteration scheme to a fixed point of T. Our class of α-hemicontractive maps is more general than the class of α-demicontractive maps. No compactness assumption is imposed on the operator or it’s domain, and no additional requirement is imposed on the set of fixed points.
Random fixed point theorems for Ciric quasi contraction in cone random metric spaces
Authors: Saluja G. S. 
Published: September 2016

Abstract
The purpose of this paper is to establish a common random fixed point theorem by using Ciric quasi contraction for two random operators in the framework of cone random metric spaces and also to obtain some random fixed point results as corollaries. Our results extend and generalize the corresponding recent result from the current existing literature.
Ball convergence for Traub-Steffensen like methods in Banach space
Authors: Argyros Ioannis K. , George Santhosh 
Published: September 2016

Abstract
We present a local convergence analysis for two Traub-Steffensen-like methods in order to approximate a locally unique solution of an equation in a Banach space setting. In earlier studies such as [16, 23] Taylor expansions and hypotheses up to the third Fréchet-derivative are used. We expand the applicability of these methods using only hypotheses on the first Fréchet derivative. Moreover, we obtain a radius of convergence and computable error bounds using Lipschitz constants not given before. Numerical examples are also presented in this study.
Integral inequalities for (Orlicz, Breckner) co-ordinated convex functions on rectangles
Authors: Cristescu Gabriela , Noor Muhammad Aslam , Awan Muhammad Uzair , Găaianu Mihail 
Published: September 2016

Abstract
The concept of (Orlicz, Breckner) co-ordinated (s, σ)-convexity is introduced for two variables real functions. Upper and lower sharp integral boundary properties of Hermite-Hadamard type are proved on rectangles.
The fundamental group of the orbit space
Authors: Hattab Hawete 
Published: September 2016

Abstract
Let G be a subgroup of the group Homeo(X) of homeomorphisms of a topological space X. Let

G
¯

$\bar G$

be the closure of G in Homeo(X). The class of an orbit O of G is the union of all orbits having the same closure as O. We denote by

X
/

G
˜

$X/\widetildeG$

the space of classes of orbits called the orbit class space. In this paper, we study the fundamental group of the spaces X/G,

X
/

G
¯

$X/\bar G$

and

X
/

G
˜

$X/\widetildeG$
Uniqueness of a Polynomial and a Differential Monomial Sharing a Small Function
Authors: Banerjee Abhijit , Ahamed Molla Basir 
Published: September 2016

Abstract
In this paper taking a question in [1] into background we investigate the uniqueness of a non-constant polynomial with the differential monomial generated by a non-constant mermorphic function f. Our result will also extend a result of Banerjee-Majumder[2] given earlier. An open question is also posed, in the paper, for future investigation.
Positive Solutions of a Nonlinear Fourth-order Integral Boundary Value Problem
Authors: Benaicha Slimane , Haddouchi Faouzi 
Published: September 2016

Abstract
In this paper, the existence of positive solutions for a nonlinear fourth-order two-point boundary value problem with integral condition is investigated. By using Krasnoselskii’s fixed point theorem on cones, sufficient conditions for the existence of at least one positive solutions are obtained.
Polish Democracy Under Threat? An Issue of Mere Politics or a Real Danger?
Authors: Jankovic Sava 
Published: September 2016

Abstract
Poland has recently experienced a constitutional crisis. The crisis involves the role of the Law and Justice Party (PiS) in the election of judges and amendments to the Constitutional Tribunal Act which threatens the independence of the Tribunal. The situation is exacerbated by changes in the media, civil service, police, and prosecution laws introduced by the ruling party. This article analyses the changes, as well as the domestic and international reactions to the crisis, and considers whether the heavy criticism of the PiS is justified, or whether it results from, for instance, specific characteristics of the Polish political system and an unfavourable opinion in Europe about the Law and Justice party.
Application of graph databases for transport purposes
Authors: Czerepicki A. 
Published: September 2016

Abstract
The article presents an innovative concept of applying graph databases in transport information systems. The model of a graph database has been presented together with implementation of data structures and search operations in a graph. The transformation concept of relational model to a graph data model has been developed. The schema of graph database has been proposed for public transport information system purposes. The realization methods have been illustrated by the use of search function based on the Cypher query language.
Dual synthesis of Petri net based application specific logic controllers with increased safety
Authors: Tkacz J. , Bukowiec A. , Adamski M. 
Published: September 2016

Abstract
In the paper, design flow of the application specific logic controllers with increased safety by means of Petri nets is proposed. The controller architecture is based on duplicated control unit and comparison results from both units. One specification of control algorithm is used by means of Petri net for both units. The hardware duplication is obtained during dual synthesis process. This process uses two different logic synthesis methods to obtain two different hardware configurations for both control units. Additionally, the dual verification is applied to increase reliability of the control algorithm. Such design flow simplifies the process of realization of control systems with increased safety.
Analysis of dynamical properties of object tracking system elements
Authors: Kuś Z. 
Published: September 2016

Abstract
The goal of this paper was to determine necessary dynamical conditions for the object tracking task. Developing these conditions required examining dynamical relationships between the UAV, camera head, disturbances and tracked object. This analysis was conducted in order to assess whether a given UAV-camera head set was suitable for a given object tracking task. The study assumed that the UAV was equipped with a flight trajectory control system. We discussed the methods of the dynamical properties description and finding a range of application for a particular set “UAV-camera head”. For each dynamical element of the examined system, we proposed a method of computing the parameters of the simulation model which corresponded to the behaviour of the real elements. In order to describe the range of the applications for the UAV-camera head set, we defined the space Ω – all combinations of the parameters which characterized the dynamics of the disturbance and object. Moreover, this study developed the method of selecting the subspace Ωs which described acceptable parameters of the object’s and disturbance’s dynamics. This paper presented the example of proper object tracking in the case of meeting the dynamical conditions and the example of losing the object in the opposite case.
Analysis of positivity and stability of fractional discrete-time nonlinear systems
Authors: Kaczorek T. 
Published: September 2016

Abstract
The positivity and asymptotic stability of the fractional discrete-time nonlinear systems are addressed. Necessary and sufficient conditions for the positivity and sufficient conditions for the asymptotic stability of the fractional nonlinear systems are established. The proposed stability tests are based on an extension of the Lyapunov method to the positive fractional nonlinear systems. The effectiveness of tests is demonstrated on examples.
Si/ZnO nanorods with Ag nanoparticles/AZO heterostructures in PV applications
Authors: Gwóźdź K. , Płaczek-Popko E. , Gumienny Z. , Zielony E. , Pietruszka R. , Witkowski B. S. , Wachnicki Ł. , Gierałtowska S. , Godlewski M. , Chang L. B. 
Published: September 2016

Abstract
Our studies focus on test structures for photovoltaic applications based on zinc oxide nanorods grown using a low-temperature hydrothermal method on a p-type silicon substrate. The nanorods were covered with silver nanoparticles of two diameters – 20–30 nm and 50–60 nm – using a sputtering method. Scanning electron microscopy (SEM) micrographs showed that the deposited nanoparticles had the same diameters. The densities of the nanorods were obtained by means of atomic force microscope (AFM) images. SEM images and Raman spectroscopy confirmed the hexagonal wurtzite structure of the nanorods. Photoluminescence measurements proved the good quality of the samples. Afterwards an atomic layer deposition (ALD) method was used to grow ZnO:Al (AZO) layer on top of the nanorods as a transparent electrode and ohmic Au contacts were deposited onto the silicon substrate. For the solar cells prepared in that manner the current-voltage (I-V) characteristics before and after the illumination were measured and their basic performance parameters were determined. It was found that the spectral characteristics of a quantum efficiency exhibit an increase for short wavelengths and this behavior has been linked with the plasmonic effect.
Facile preparation of copper impregnated aluminum pillared montmorillonite: nanoclays for wastewater treatment
Authors: Tepmatee P. , Siriphannon P. 
Published: September 2016

AbstractCopper impregnated aluminum pillared montmorillonites (Cu-iAlpill-MMTs) were prepared by adding Cu2+solution into dried aluminum polyohydroxy cation intercalated montmorillonite using various Cu2+concentrations, i.e. 4, 7, 10 and 13 wt% and then calcining at 500°C. The Cu-iAlpill-MMTs possessed slit-liked mesopores with pore diameters of 3.3–3.8 nm and ~6–35 nm as observed from the nitrogen adsorption isotherms. The mesopore quantities of Cu-iAlpill-MMTs gradually decreased with the increase of impregnated Cu2+concentrations. The impregnated CuO occupied not only the interior interlayers, but also the exterior surfaces of Cu-iAlpill-MMTs. The Cu-iAlpill-MMTs with 10 and 13 wt% of impregnated Cu2+could inhibit the growth ofEscherichia coli. The Cu-iAlpill-MMTs effectively acted as the heterogeneous catalyst for removal reactive orange 16 (RO16) in Fenton or photo-Fenton oxidation treatments. The higher impregnated Cu2+and/or the longer treatment time brought about the higher percentage of RO16 removal.
Analytical description of power losses in a transformer operating in the dual active bridge converter
Authors: Barlik R. , Nowak M. , Grzejszczak P. , Zdanowski M. 
Published: September 2016

AbstractThe paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz’s and Dowell’s equations. The analytical results have been verified experimentally.
Diophantine equation based model of data transmission errors caused by interference generated by DC-DC converters with deterministic modulation
Authors: Bojarski J. , Smolenski R. , Lezynski P. , Sadowski Z. 
Published: September 2016

AbstractThe assurance of the electromagnetic compatibility of sensitive smart metering systems and power electronic converters, which introduce high-level electromagnetic interference is important factor conditioning reliable operation of up to date power systems. Presented experimental results have shown that currently binding, frequency domain tests are ineffective for the evaluation of data transmission error hazards. The proposed in this paper mathematical, time-domain model, based on Diophantine equation, enables evaluation of data transmission errors caused by interference introduced by DC-DC power electronic interfaces with deterministic modulation. In the paper there have been presented possible application areas for the proposed model.
Sensitivity of transient temperature field in domain of forearm insulated by protective clothing with respect to perturbations of external boundary heat flux
Authors: Mochnacki B. , Ciesielski M. 
Published: September 2016

AbstractThe problem discussed in the paper is numerical modeling of thermal processes in the domain of biological tissue secured by a layer of protective clothing being in thermal contact with the environment. The cross-section of the forearm (2D problem) is treated as non-homogeneous domain in which the sub-domains of skin tissue, fat, muscle and bone are distinguished. The air gap between skin tissue and protective clothing is taken into account. The process of external heating is determined by Robin boundary condition and sensitivity analysis with respect to the perturbations of heat transfer coefficient and ambient temperature is also discussed. Both the basic boundary-initial problem and the sensitivity problems are solved by means of control volume method using Voronoi polygons.
Experimental studies of the quality of embossed characters of the Braille alphabet
Authors: Barczyk R. , Jasińska-Choromańska D. 
Published: September 2016

Abstract
The paper presents studies pertaining to the quality of embossed characters of the Braille alphabet used, among other applications, for tagging drug labels. The following parameters of embossed inscriptions were measured: height, diameter of the dots and surface roughness (18 samples with various combinations of their values). 48 blind individuals assessed the quality of the printed text. Statistical analysis proved that a text with dots having height of 0.9 millimeter, diameter of 1.6 millimeters and roughness Ra of about 1 micrometer to be the best. The samples had been made using two different methods of rapid prototyping: PolyJet and SLS. 3D printing is increasingly popular and the studies proved the usefulness of these methods for labeling with embossed inscriptions, due to the repeatability, durability and quality they ensure. The assessing group of blind individuals was comprised of 24 persons 14–17 years old and other 24 persons aged over 60 who were not proficient in reading Braille alphabet, This allows to conclude that a text featuring the above values of the parameters will be easy to read for the majority of blind persons.