bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Liquid Forming Process of Nickel Superalloys Thin Sheet Metals
Authors: Hyrcza-Michalska M. 
Published: December 2017

AbstractThe paper presents the study of drawability of thin sheet metals made of a nickel superalloy Inconel type. The manufacturing process of axisymmetric cup – cone and a closed section profile in the form of a circular tube were designed and analyzed. In both cases, working fluid-oil was used in place of the rigid tools. The process of forming liquid is currently the only alternative method for obtaining complex shapes, coatings, and especially if we do it with high-strength materials. In the case of nickel superalloys the search for efficient methods to manufacture of the shaped shell is one of the most considerable problems in aircraft industry [1-5]. However, the automotive industries have the same problem with so-called advanced high-strength steels (AHSS). Due to this, both industrial problems have been examined and the emphasis have been put on the process of liquid forming (hydroforming). The study includes physical tests and the corresponding numerical simulations performed, using the software Eta/Dynaform 5.9. Numerical analysis of the qualitative and quantitative forecasting enables the formability of materials with complex and unusual characteristics of the mechanical properties and forming technology. It has been found that only the computer aided design based on physical and numerical modeling, makes efficient plastic processing possible using a method of hydroforming. Drawability evaluation based on the determination of the mechanical properties of complex characteristics is an indispensable element of this design in the best practice of industrial manufacturing products made of thin sheet metals.
Electrochemical Corrosion of Magnesium Alloy AZ31 with Additive Lithium
Authors: Przondziono J. , Hadasik E. , Szala J. 
Published: December 2017

AbstractThe purpose of performed tests was evaluation of resistance to electrochemical corrosion of extruded magnesium alloy AZ31 with additive of 4.5% Li. Corrosion tests were performed in 0.01-2.0 M NaCl solutions. Potentiodynamic tests enabled to register polarisation curves. With application of stereoscopic microscope Nikon SMZ745T and electron scanning microscope Hitachi S-4200, the surface of the alloy was observed after immersion tests performed in 1-6 days. Results of performed tests prove explicitly deterioration of corrosion properties of the alloy with the increase of molar concentration of NaCl solution. It can be seen that corrosion process is intensive and that intensity increases with the increase of solution concentration and extension of exposure time.
Microstructure and Properties of Selected Magnesium-Aluminum Alloys Prepared for SPD Processing Technology
Authors: Cizek L. , Rusz S. , Hilser O. , Śliwa R. , Kuc D. , Tański T. , Tkocz M. 
Published: December 2017

AbstractA growing interest in wrought magnesium alloys has been noticed recently, mainly due to development of various SPD (severe plastic deformation) methods that enable significant refinement of the microstructure and – as a result – improvement of various functional properties of products. However, forming as-cast magnesium alloys with the increased aluminum content at room temperature is almost impossible. Therefore, application of heat treatment before forming or forming at elevated temperature is recommended for these alloys. The paper presents the influence of selected heat treatment conditions on the microstructure and the mechanical properties of the as-cast AZ91 alloy. Deformation behaviour of the as-cast AZ61 alloy at elevated temperatures was analysed as well. The microstructure analysis was performed by means of both light microscopy and SEM. The latter one was used also for fracture analysis. Moreover, the effect of chemical composition modification by lithium addition on the microstructure of the AZ31-based alloy is presented. The test results can be helpful in preparation of the magnesium-aluminum alloys for further processing by means of SPD methods.
Modification of Aluminium-Silicon Near-Eutectic Alloy with Use of Electrolysis of Sodium Salt
Authors: Białobrzeski A. , Pezda J. , Jarco A. 
Published: December 2017

AbstractThe present work discusses results of preliminary tests concerning the technology of continuous dosage of sodium to a metallic bath from the aspect of modification of EN AC-44200 alloy, through the use of a multiple compound (salt) of sodium. The technology consists in continuous electrolysis of sodium salts occurring directly in a crucible with liquid alloy. As a measure of the degree of alloy modification over the course of testing, the ultimate tensile strength (UTS or Rm) and analysis of microstructure are taken, which confirm the obtained effects of the modification on the investigated alloy. Assurance of stable parameters during the process of continuous modification with sodium, taking into consideration the fact of complex physical-chemical phenomena, requires additional tests aimed at their optimization and determination of a possibility of implementation of such technology in metallurgical processes.
The Decopperization and Coagulation by Use the Carbon-N-Ox Method
Authors: Bydałek A.W. , Migas P. , Wołczyński W. , Karwan-Baczewska J. 
Published: December 2017

AbstractThis paper discusses the impact of complex chemical reagents during the process of decopperisation of slag. The beneficial effect of carbide response factors with the participation of nitrogen was indicated as well as the role of stimulators surfactants. Based on the results of the research the basic structure of the slag during decopperisation was systematized. The effects of coagulation of droplets of copper in the slag were shown in this paper.
Spectrophotometric Analysis of the Kinetic of Pd(II) Chloride Complex Ions Sorption Process from Diluted Aqua Solutions Using Commercially Available Activated Carbon
Authors: Wojnicki M. 
Published: December 2017

AbstractIn this paper, results of adsorption kinetic studies of Pd(II) chloride complex ions on activated carbon Organosrob 10 CO are presented. Spectorphotometrical method was applied to investigate the process. Kinetic model was proposed, and fundamental thermodynamic parameters were determined. Proposed kinetic model describes well observed phenomenon in the studied range of concentration of Pd(II) chloride complex ions as well, as concentration of activated carbon.
Fault Diagnosis of Three Phase Induction Motor Using Current Signal, MSAF-Ratio15 and Selected Classifiers
Authors: Glowacz A. , Glowacz W. , Glowacz Z. , Kozik J. , Gutten M. , Korenciak D. , Khan Z. F. , Irfan M. , Carletti E. 
Published: December 2017

AbstractA degradation of metallurgical equipment is normal process depended on time. Some factors such as: operation process, friction, high temperature can accelerate the degradation process of metallurgical equipment. In this paper the authors analyzed three phase induction motors. These motors are common used in the metallurgy industry, for example in conveyor belt. The diagnostics of such motors is essential. An early detection of faults prevents financial loss and downtimes. The authors proposed a technique of fault diagnosis based on recognition of currents. The authors analyzed 4 states of three phase induction motor: healthy three phase induction motor, three phase induction motor with 1 faulty rotor bar, three phase induction motor with 2 faulty rotor bars, three phase induction motor with faulty ring of squirrel-cage. An analysis was carried out for original method of feature extraction called MSAF-RATIO15 (Method of Selection of Amplitudes of Frequencies – Ratio 15% of maximum of amplitude). A classification of feature vectors was performed by Bayes classifier, Linear Discriminant Analysis (LDA) and Nearest Neighbour classifier. The proposed technique of fault diagnosis can be used for protection of three phase induction motors and other rotating electrical machines. In the near future the authors will analyze other motors and faults. There is also idea to use thermal, acoustic, electrical, vibration signal together.
Changes in Structure of CuCr0.6 Alloy After Repetitive Corrugation Process
Authors: Jung T. , Kwaśny W. , Rdzawski Z. , Głuchowski W. , Matus K. , Pawlyta M. , Szindler M. 
Published: December 2017

AbstractThis paper presents the study of repetitive corrugation process influence on the strengthening of annealed alloy. Based on the results of mechanical properties of deformed sample, it has been found that the microhardness, ultimate tensile strength, yield strength and apparent elastic limit are significantly increased in relation to annealed sample. Examination on transmission electron microscopy confirmed the effect of intensive plastic deformation on structure fragmentation in the nanometric scale. This work confirmed the possibility of using the repetitive corrugation process to increase mechanical properties of CuCr0.6 alloy.
The Early Repolarization ECG Pattern – An Update
Authors: Szabó István Adorján , Fárr Annamária , Kocsis Ildikó , Máthé Lehel , Szilágyi László , Frigy Atilla 
Published: December 2017

Abstract
Early repolarization pattern (ERP), a form of J-wave syndromes, was considered long time a benign ECG phenomenon. However, recent data confirmed that certain phenotypes of ERP are related to an increased risk of sudden cardiac death (idiopathic ventricular fibrillation). Our paper gives a short and practical update regarding the main issues related to ERP: epidemiological data, molecular and electrophysiological background, clinical significance and risk stratification. At the end, the future directions of research and clinical management related to ERP are presented.
Validation of High Performance Liquid Chromatography Methods for Determination of Meloxicam and Tenoxicam from Transdermal Therapeutic Systems
Authors: Antonoaea Paula , Cârje Anca Gabriela , Ciurba Adriana , Todoran Nicoleta , Vlad Alexandru Robert , Muntean Daniela Lucia 
Published: December 2017

Abstract

Objective: The aim of this study was to develop and validate two HPLC methods for the quantification of meloxicam and tenoxicam from transdermal therapeutic systems.

Methods: Based on 1.0% hydroxypropyl methylcellulose 15000, transdermal patches containing meloxicam or tenoxicam were prepared by solvent evaporation technique. Analytical performances of the HPLC methods for the quantification of meloxicam and tenoxicam from such systems were assessed in terms of specificity, linearity, detection limit, quantification limit, recovery and precision.

Results and discussion: The linearity of the method was assessed through a calibration curve in the 1.0 - 75.0 μg∙mL−1 concentration range, with a regression coefficient higher than 0.999. The detection limit and the quantification limit were found to be 0.46 μg∙mL−1 and 1.39 μg∙mL−1, for meloxicam; and 0.88 μg∙mL−1, respectively 2.64 μg∙mL−1 for tenoxicam. According to the European Pharmacopeia 5.0 the mean recovery was found to be between 75% and 125%. As performance criteria for precision was used the RSD% which were lower than 2.0% for both methods.

Conclusions: The proposed liquid chromatography methods provide selective, linear and precise results for the quantification of meloxicam and tenoxicam from transdermal therapeutic systems. The presence of a single peak in the chromatograms of the analyzed transdermal patches with meloxicam or tenoxicam, certify the successful determination of the active pharmaceutical ingredient in the prepared patches.
Simultaneous Extrahepatic Portal and Iliac Veins Thrombosis After Abdominal Surgery - A Case Report and Review of Literature
Authors: Tilea Ioan , Negovan Anca Elena , Tatar Cristina Maria , Ardeleanu Elena , Neagoe Radu Mircea , Marginean Raluca , Varga Andreea 
Published: December 2017

Abstract

Introduction: Extrahepatic portal vein thrombosis (EPVT) is the most frequent cause that leads to portal hypertension in non-cirrhotic patients. This condition is related to systemic and local risk factors (such as inflammatory lesions, injuries to portal venous system by surgery, vascular procedures).

Case presentation: A case of extended extrahepatic portal vein thrombosis and simultaneous thrombosis of left common iliac vein and inferior vena cava, appeared after abdominal surgery in a hypertensive, diabetic, 50 y.o. man is presented. An acute episode of abdominal pain was interpreted as an emergency and a surgical (initially laparoscopic and then open) procedure was planned in order to perform an appendectomy. Discharge diagnosis was hemoperitoneum secondary to iatrogenic rupture of sigmoid mesocolon provoked by trocar manipulation. Repeated imaging studies performed later revealed the thrombosis of portal vein with extension into right portal branch associated with superior mesenteric thrombosis and free-floating thrombus into left common iliac vein extended towards inferior vena cava. Surgical manoeuvres are considered as triggers of these thrombotic events. After 4 weeks of parenteral anticoagulation a partial recanalization of thrombi was identified, without bleedings.

Conclusions: Acute EPVT needs a carefully management. Case is linked to abdominal surgery and requires prolonged anticoagulation related to simultaneous portal and iliac vein thrombosis. Associated conditions (hypertension and diabetes mellitus) must have an appropriate approach. After our knowledge this is the first case published in literature.
Lifetime Performances of Modernized GLONASS Satellites: A Review
Authors: Sarkar Shreya , Bose Anindya 
Published: December 2017

Abstract
GLONASS, successfully operating during 1990s became unusable by early 2000s. Following a revitalization and modernization plan since 2004, GLONASS constellation has been completed again by the end of 2011 and the use of GLONASS is gaining popularity. Because of the previous experience, some scepticism exists among the stakeholders in using GLONASS for reliable solution and application development. This paper critically reviews the operational lifespan of GLONASS satellites launched between 2004 and 2016, as this is an important contributor towards reliability and sustained operation of the system. For popularization and extracting full benefits of GLONASS as stand-alone system or as an active component of multi-GNSS, major issues of assuring the minimum sufficient GLONASS constellation (of 24…23 satellites), efficient design implementation and the modernized ground control segment development and operation need to be properly taken care of by the system operators.
EGNOS Monitoring Prepared in Space Research Centre P.A.S. for SPMS Project
Authors: Swiatek Anna , Jaworski Leszek , Tomasik Lukasz 
Published: December 2017

Abstract
The European Geostationary Overlay Service (EGNOS) augments Global Positioning System (GPS) by providing correction data and integrity information for improving positioning over Europe. EGNOS Service Performance Monitoring Support (SPMS) project has assumed establishment, maintenance and implementation of an EGNOS performance monitoring network.
The paper presents preliminary results of analyses prepared in Space Research Centre, Polish Academy of Sciences (Warsaw), as one of partners in SPMS project.
A “Stranger” Researching Narratives in Southern Slovakia: Hungarian Minority Research by an Anthropologist Who Is Not “At Home”
Authors: Kambara Yuko 
Published: December 2017

Abstract
This paper considers methodological questions regarding cultural/social anthropological research in multiethnic fields. Specifically, I attempt to reconsider the possibility of anthropological research by a “stranger” based on a research that I—a Japanese anthropologist—conducted in southern Slovakia. Anthropology originally developed as the study of other cultures; in some European countries, however, most anthropological research is conducted by anthropologists who are “at home”. For Slovak and Hungarian researchers, the Hungarian minority has been a common research target; therefore, many inhabitants, both ethnic Hungarians and Slovaks, have already experienced social research as subjects. Some interviewees get use to present a narrative expressing how they think about a certain topic. This research condition points to a fundamental question in the interviews of anthropological research. In this paper, therefore, my research experience is described to analyze reflexively my research position in the field.
In fact, it is difficult to theoretically define the boundary between “at home” and “stranger”; the difference depends on the context of each study. Anthropologists need to interpret their narratives by considering the results of participant observation and reflexivity in the research. “Stranger” anthropologists might have the advantage of noticing informants’ reflexivity in their narratives. This discussion can, in turn, become part of an ongoing process by which inhabitants’ interactions with researchers create new master narratives in the field.
Individualized identification of disturbed pathways in sickle cell disease
Authors: Lu Chun-Juan , Wang Yan , Huang Ya-Li , Li Xin-Hua 
Published: December 2017

AbstractBackgroundSickle cell disease (SCD) is one of the most common genetic blood disorders. Identifying pathway aberrance in an individual SCD contributes to the understanding of disease pathogenesis and the promotion of personalized therapy. Here we proposed an individualized pathway aberrance method to identify the disturbed pathways in SCD.MethodsBased on the transcriptome data and pathway data, an individualized pathway aberrance method was implemented to identify the altered pathways in SCD, which contained four steps: data preprocessing, gene-level statistics, pathway-level statistics, and significant analysis. The changed percentage of altered pathways in SCD individuals was calculated, and a differentially expressed gene (DEG)-based pathway enrichment analysis was performed to validate the results.ResultsWe identified 618 disturbed pathways between normal and SCD conditions. Among them, 6 pathways were altered in > 80% SCD individuals. Meanwhile, forty-six DEGs were identified between normal and SCD conditions, and were enriched in heme biosynthesis. Relative to DEG-based pathway analysis, the new method presented richer results and more extensive application.ConclusionThis study predicted several disturbed pathways via detecting pathway aberrance on a personalized basis. The results might provide new sights into the pathogenesis of SCD and facilitate the application of custom treatment for SCD.
Effect of lithium nitrate on the reaction between opal aggregate and sodium and potassium hydroxides in concrete over a long period of time
Authors: Zapała-Sławeta J. , Owsiak Z. 
Published: December 2017

AbstractAlkali-silica reaction (ASR) is a reaction between amorphous or poorly crystallized siliceous phase, present in aggregates, and sodium and potassium hydroxides in the pore solution of concrete. Chemical admixtures such as lithium compounds are known to have high potential of inhibiting ASR. The aim of this study was to determine the effect of lithium nitrate on ASR in mortars containing high reactive opal aggregate over a long period of time. Mortar bar expansion tests were performed and microstructures of mortar bars were observed by scanning electron microscopy coupled with an energy dispersive X-ray microanalyser. Results from this study showed that effectiveness of lithium nitrate in mitigating ASR was limited over a long period of time. A larger amount of ASR gel which was formed in the presence of lithium nitrate indicated that the deterioration processes intensify within longer periods of time, which so far has not been observed in literature. Microscopic observation confirmed the presence of alkali-silica gel and delayed ettringite in mortars with lithium nitrate.
Test-supported numerical analysis for evaluation of the load capacity of thin-walled corrugated profiles
Authors: Piekarczuk A. 
Published: December 2017

Abstract
The paper concentrates on a quantitative evaluation of the load capacity of thin-walled, curved steel profiles used as arched roofs in building structures. Corrugation of a profile surface formed by cold rolling changes its load capacity as compared to thin-walled profiles. The paper presents a comparative evaluation of the influence of a sample profile corrugation on its ability to transfer internal forces. The results of the study are presented as limit curves describing load capacity at simultaneous bending and compression. The analysis was conducted using a numerical computational method supported by a study of elements in natural scale. The paper presents a methodology of test-supported calculations and guidelines for practical use by designers.
Iterative sliding mode observer for sensorless control of five-phase permanent magnet synchronous motor
Authors: Yang J. , Dou M. , Zhao D. 
Published: December 2017

AbstractDue to the star connection of the windings, the impact of the third harmonic which does not exist in three-phase permanent magnet synchronous motor (PMSM) cannot be ignored in five-phase PMSM. So the conventional sensorless control methods for three-phase PMSM cannot be applied for five-phase PMSM directly. To achieve the sensorless control for five-phase PMSM, an iterative sliding mode observer (ISMO) is proposed with the consideration of the third harmonic impact. First, a sliding mode observer (SMO) is designed based on the fivephase PMSM model with the third harmonic to reduce the chattering and obtain the equivalent signal of the back electromotive force (EMF). Then, an adaptive back EMF observer is built to estimate the motor speed and rotor position, which eliminates the low-pass filter and phase compensation module and improves the estimation accuracy. Meanwhile, by iteratively using the SMO in one current sampling period to adjust the sliding mode gains, the sliding mode chattering and estimation errors of motor speed and rotor position are further reduced. Besides, the stability of the SMO and the adaptive back EMF observer are demonstrated in detail by Lyapunov stability criteria. Experiment results verify the effectiveness of the proposed observer for sensorless control of five-phase PMSM.
Multi-spark modeling of very fast transient overvoltages for the purposes of developing HV and UHV gas-insulated switchgear and of conducting insulation co-ordination studies
Authors: Szewczyk M. 
Published: December 2017

AbstractVery fast transient overvoltages (VFTO) originate from steep voltage breakdowns in SF6gas that are inherent to operation of any switching device of the gas-insulated switchgear (GIS) type. For power stations with voltage ratings exceeding 500 kV, the ratio between equipment rated- and withstand-voltage levels becomes relatively low, which causes the VFTO peak values to reach the component’s insulation withstand-voltage levels, thus becoming a design factor for high- and ultra-high voltage GIS. While well-established approach to VFTO analyses involves only single VFTO events (the so-called single-spark approach), there is often the need to analyze the entire VFTO generation process, for which the multi-spark approach to VFTO modeling is to be employed. The multi-spark approach allows one to evaluate the VFTO impact on the GIS disconnector design along with the impact of the VFTO on selection and dimensioning of the VFTO damping solutions. As the multi-spark approach to VFTO modeling is now being increasingly used in UHV GIS developments as well as for the insulation co-ordination studies of power stations, the present paper is motivated by the need to report on the VFTO multi-spark modeling approach and to lay a common ground for development works that are supported extensively with VFTO simulations. The paper presents physical assumptions and modeling concepts that are in use in such modeling works. Development of the multi-spark GIS disconnector model for VFTO simulations is presented, followed by an overview of examples of the model application for the GIS development works and for insulation co-ordination studies.