bluuebunny/crossref_metadata_2025 huggingface dataset:
Braze Welding TIG of Titanium and Aluminium Alloy Type Al – Mg
Authors: Winiowski A. , Majewski D.
Published: March 2016

The article presents the course and the results of technological tests related to TIG-based arc braze welding of titanium and AW-5754 (AlMg3) aluminium alloy. The tests involved the use of an aluminium filler metal (Al99.5) and two filler metals based on Al-Si alloys (AlSi5 and AlSi12). Braze welded joints underwent tensile tests, metallographic examinations using a light microscope as well as structural examinations involving the use of a scanning electron microscope and an X-ray energy dispersive spectrometer (EDS). The highest strength and quality of welds was obtained when the Al99.5 filler metal was used in a braze welding process. The tests enabled the development of the most convenient braze welding conditions and parameters.
Dissolution of Metal Supported Spent Auto Catalysts in Acids
Authors: Fornalczyk A. , Kraszewski M. , Willner J. , Kaduková J. , Mrážiková A. , Marcinčáková R. , Velgosová O.
Published: March 2016

Metal supported auto catalysts, have been used in sports and racing cars initially, but nowadays their application systematically increases. In Metal Substrate (supported) Converters (MSC), catalytic functions are performed by the Platinum Group Metals (PGM): Pt, Pd, Rh, similarly to the catalysts on ceramic carriers. The contents of these metals make that spent catalytic converters are valuable source of precious metals. All over the world there are many methods for the metals recovery from the ceramic carriers, however, the issue of platinum recovery from metal supported catalysts has not been studied sufficiently yet. The paper presents preliminary results of dissolution of spent automotive catalyst on a metal carrier by means of acids: H2SO4, HCl, HNO3, H3PO4. The main assumption of the research was the dissolution of base metals (Fe, Cr, Al) from metallic carrier of catalyst, avoiding dissolution of PGMs. Dissolution was the most effective when concentrated hydrochloric acid, and 2M sulfuric acid (VI) was used. It was observed that the dust, remaining after leaching, contained platinum in the level of 0.8% and 0.7%, respectively.
Determination of γ′+γ / γ Phase Boundary in Ni-Al-Cr System Using DTA Thermal Analysis
Authors: Maciąg T. , Rzyman K.
Published: March 2016

Mechanical properties at elevated temperature, in modern alloys based on intermetallic phase Ni3Al are connected with phase composition, especially with proportion of ordered phase γ′ (L12) and disordered phase γ (A1). In this paper, analysis of one key systems for mentioned alloys - Ni-Al-Cr, is presented. A series of alloys with chemical composition originated from Ni-rich part of Ni-Al-Cr system was prepared. DTA thermal analysis was performed on all samples. Based on shape of obtained curves, characteristic for continuous order-disorder transition, places of course of phase boundaries γ′+γ / γ were determined. Moreover, temperature of melting and freezing of alloys were obtained. Results of DTA analysis concerning phase boundary γ′+γ / γ indicated agreement with results obtained by authors using calorimetric solution method.
Study of Tundish Slag Entrainment Using Physical Modelling
Authors: Michalek K. , Gryc K. , Socha L. , Tkadlečková M. , Saternus M. , Pieprzyca J. , Merder T. , Pindor L.
Published: March 2016

This paper deals with the possibilities of using physical modelling to study the slag entrainment in the tundish. A level of steel in the tundish is changing during sequential continuous casting. The most significant decrease in the steel level occurs when replacing ladles. It is generally known that if the height of steel level in the tundish drops below a certain critical level, it may generate vortexes over the nozzles and as a consequence entrainment of tundish slag into individual casting strands can occur. Thus, it is necessary to identify the critical level of steel for specific operational conditions. In this paper, the development of physical modelling methodology is described as well as physical model corresponding to operational continuous casting machine No. 2 in Třinecké železárny, a.s. The obtained results are discussed.
Influence of Hydrodynamic Structure on Mixing Time of Alloy Additions with Liquid Steel in One Strand Tundish
Authors: Cwudziński A.
Published: March 2016

The knowledge of the hydrodynamic pattern aids in designing new and modernizing existing tundishes. The device under examination is an one-strand tundish of a capacity of 30 Mg. Computer simulation of the liquid steel flow, tracer and alloy addition behaviour in turbulent motion conditions was done using the Ansys-Fluent®computer program. The hydrodynamic conditions of steel flow were determined based on the distribution of the characteristics of tundish liquid steel residence time distribution (RTD). The alloy addition was introduced to the liquid steel by the pulse-step method. Based on computer simulations carried out, steel flow fields and RTD and mixing curves were obtained, and the shares of stagnant volume flow and active flow and the mixing time were computed. Dispersion of the alloy addition in liquid steel during its flow through the tundish is a dynamic process which is determined by the hydrodynamic conditions occurring in the tundish working space.
Silver Matrix Composites - Structure and Properties
Authors: Wieczorek J. , Oleksiak B. , Łabaj J. , Węcki B. , Mańka M.
Published: March 2016

Phase compositions of composite materials determine their performance as well as physical and mechanical properties. Depending on the type of applied matrix and the kind, amount and morphology of the matrix reinforcement, it is possible to shape the material properties so that they meet specific operational requirements. In the paper, results of investigations on silver alloy matrix composites reinforced with ceramic particles are presented. The investigations enabled evaluation of hardness, tribological and mechanical properties as well as the structure of produced materials. The matrix of composite material was an alloy of silver and aluminium, magnesium and silicon. As the reinforcing phase, 20-60 μm ceramic particles (SiC, SiO2, Al2O3and Cs) were applied. The volume fraction of the reinforcing phase in the composites was 10%. The composites were produced using the liquid phase (casting) technology, followed by plastic work (the KOBO method). The mechanical and tribological properties were analysed for plastic work-subjected composites. The mechanical properties were assessed based on a static tensile and hardness tests. The tribological properties were investigated under dry sliding conditions. The analysis of results led to determination of effects of the composite production technology on their performance. Moreover, a relationship between the type of reinforcing phase and the mechanical and tribological properties was established.
Influence of Zinc on the Surface Tension, Density and Molar Volume of (Ag-Sn)eut +Zn Liquid Alloys
Authors: Gąsior W. , Pstruś J. , Moser Z.
Published: March 2016

The dilatometric and maximum bubble pressure methods were applied for the measurements of the density and surface tension of liquid (Ag-Sn)eut+Zn lead-free solders. The experiments were carried out in the temperature range from 515 to 1223 K for the alloys of the zinc concentration equaling 0.01, 0.02, 0.04, 0.05, 0.1 and 0.2 of the mole fraction. It was found that the temperature dependence of both the density and the surface tension could be thought as linear, so they were interpreted by straight line equations. The experimental data of the molar volume of the investigated alloys were described by the polynomial dependent on the composition and temperature.

Calculations of the surface tension by Butler’s equation were conducted and confronted with the experimental data. Some significant deviations between the experimental and the calculated surface tension were observed. They reached almost 40 mNm-1. The observed changes of the density and surface tension caused by the zinc addition to the Ag-Sn eutectic were discussed with the consideration of the thermodynamic properties and the influence of a small quantity of impurities in a protective gas atmosphere.
Ab Initio Study of Structure, Electronic and Magnetic Properties of YFe5 Phase Compound in the DFT Formalism
Authors: Gruszka K. , Nabiałek M. , Noga T.
Published: March 2016

Paper presents results of studies on structural, electronic and magnetic properties of YFe5 compound using density functional theory (DFT) approach. The GGA functional with ultrasoft pseudopotentials were used as implemented in Quantum Espresso software. The structure of YFe5 compound was examined in three different states namely nonmagnetic, antiferromagnetic and ferromagnetic. Also two antiferromagnetic configurations were considered. From the total energy viewpoint the most likely ferromagnetic configuration is favorable. In order to achieve mentioned aims we present projected density of states, electronic band structure and Löwdin population analysis studies results.
The Microstructure of WE43 MMC Reinforced with SiC Particles
Authors: Dybowski B. , Rzychoń T. , Chmiela B. , Gryc A.
Published: March 2016

It is well known that the properties of a metal matrix composites depend upon the properties of the reinforcement phase, of the matrix and of the interface. A strong interface bonding without any degradation of the reinforcing phase is one of the prime objectives in the development of the metal matrix composites. Therefore, the objective of this work is to characterize the interface structure of WE43/SiC particles composite. Magnesium alloys containing yttrium and neodymium are known to have high specific strength, good creep and corrosion resistance up to 250°C. The addition of SiC ceramic particles strengthens the metal matrix composite resulting in better wear and creep resistance while maintaining good machinability. In the present study, WE43 magnesium matrix composite reinforced with SiC particulates was fabricated by stir casting. The SiC particles with 15 μm, 45 μm and 250 μm diameter were added to the WE43 alloy. The microstructure of the composite was investigated by optical microscopy, scanning electron microscopy, scanning transmission electron microscopy and XRD analysis. YSi and Y2Si reaction products are observed at the interfaces between SiC particles and WE43 matrix in the composite stirred at 780°C. Microstructure characterization of WE43 MMC with the 45 μm, stirred at 720°C showed relative uniform reinforcement distribution. Moreover, the Zr-rich particles at particle/matrix interface were visible instead of Y-Si phases. In the case of composite with 15 μm particles the numerous agglomerates and reaction products between SiC particles and alloying elements were observed. The presence of SiC particles assisted in improving hardness and decreasing the tensile strength and plastic properties.
Texture and Microtexture of Pure (6N) and Commercially Pure Aluminum after Deformation by Extrusion with Forward-Backward Rotating Die (Kobo)
Authors: Bieda M. , Boczkal S. , Koprowski P. , Sztwiertnia K. , Pieła K.
Published: March 2016

Pure aluminium (6N) and commercially pure aluminium (99.7) was deformed by KOBO method. Microstructure and texture of both materials after deformation was analyzed by means of scanning and transmission electron microscopy. Advanced methods of crystallographic orientations measurements like Electron Backscatter Diffraction - EBSD (SEM) and microdiffraction (TEM) was used. Grain size distribution and misorientation between grains in cross and longitudinal sections of the samples were analyzed. Differences in size and homogeneity of the grains were observed in both materials. Pure aluminium was characterized by larger grain size in both sections of extruded material. Whereas commercially pure aluminium reveals smaller grain size and more homogeneous and stable microstructure.
Control Optimisation of the New Drive of Small Diameter Knitting Machines
Authors: Skřivánek Josef , Bílek Martin , Kašpárek Michal
Published: March 2016

The article is concerned with the issues of the drive of small diameter knitting machines. In connection to the proposal of optimum structure of the driving systems of the machine, there have been analysed the possibilities of precisely controlled servo drives. An optimised structure of the drives allows for the utilisation of precisely defined position and velocity functions. There is applied here the function of a polynomial of 7th degree, proposed for impact-free course of the acceleration, and it is compared with the results corresponding to the existing structure of drives of knitting machines. At the same time, there is analysis and comparison of the consumption of electric power by the original and optimised systems.
Open-End Yarn Properties Prediction Using HVI Fibre Properties and Process Parameters
Authors: Ghanmi Hanen , Ghith Adel , Benameur Tarek
Published: March 2016

This article provides three models to predict rotor spun yarn characteristics which are breaking strength, breaking elongation and unevenness. These models used noncorrelated raw material characteristics and some processing parameters. For this purpose, five different cotton blends were processed into rotor spun yarns having different metric numbers (Nm10, Nm15, Nm18, Nm22, Nm30 and Nm37). Each count was spun at different twist levels. Response surface method was used to estimate yarn quality characteristics and to study variable effects on these characteristics. In this study, predicting models are given by the analysis of response surface after many iterations in which nonsignificant terms are excluded for more accuracy and precision. It was shown that yarn count, twist and sliver properties had considerable effects on the open-end rotor spun yarn properties. This study can help industrial application since it allows a quality management-prediction based on input variables such as fibre characteristics and process parameters.
Influence of Fabric Parameters on Thermal Comfort Performance of Double Layer Knitted Interlock Fabrics
Authors: Afzal Ali , Ahmad Sheraz , Rasheed Abher , Ahmad Faheem , Iftikhar Fatima , Nawab Yasir
Published: March 2016

The aim of this study was to analyse the effects of various fabric parameters on the thermal resistance, thermal conductivity, thermal transmittance, thermal absorptivity and thermal insulation of polyester/cotton double layer knitted interlock fabrics. It was found that by increasing fibre content with higher specific heat increases the thermal insulation while decreases the thermal transmittance and absorptivity of the fabric. It was concluded that double layer knitted fabrics developed with higher specific heat fibres, coarser yarn linear densities, higher knitting loop length and fabric thickness could be adequately used for winter clothing purposes.
PLA/PHA-Biodegradable Blends for Pneumothermic Fabrication of Nonwovens
Authors: Szuman Krzysztofa , Krucińska Izabella , Boguń Maciej , Draczyński Zbigniew
Published: March 2016

This study presents the results of research concerning fabrication of nonwovens from biodegradable polymer blends using the melt-blown method. The experiments performed within the framework of the research confirmed the possibility of obtaining polymer composites based on polylactide (PLA) with poly(hydroxyalkanoates) (PHA) and another aliphatic-aromatic copolyester. The obtained products were subjected to the analyses of chemical structure using the Fourier Transform Infrared Spectroscopy(FTIR) Attenuated Total Reflectance(ATR) method. The physical and mechanical properties of the fabricated nonwoven layers were also tested, which confirmed a wide spectrum of their applicability, depending on the polymer composition used in production.
The Impact of Political Uncertainty: A Robust Control Approach
Authors: Baumann Robert , Svec Justin
Published: March 2016

We examine how candidate uncertainty affects the policy platforms chosen in a unidimensional, two-candidate Downsian spatial model. The candidates, we assume, do not know the true distribution of voters. Following the robust control literature, candidates respond to this uncertainty by applying a max–min operator to their optimization problem. This approach, consistent with findings within the behavioral economics literature, protects the candidate by ensuring that her expected utility never falls too far, regardless of the true voter distribution. We show that this framework produces a continuum of equilibria upon which the candidates can converge and that the size of this continuum is weakly increasing in each candidate’s uncertainty. We argue that our model can explain movements in political platforms over time. That is, the mere presence of candidate uncertainty, in addition to shifts in attitudes or demographics, can cause political candidates to change their policy positions across elections.
Dynamic change of the systemic immune inflammation index predicts the prognosis of patients with hepatocellular carcinoma after curative resection
Authors: Wang Bei-li , Tian Lu , Gao Xing-Hui , Ma Xiao-Lu , Wu Jiong , Zhang Chun-Yan , Zhou Yan , Guo Wei , Yang Xin-Rong
Published: March 2016

Background:

The aim of the study was to determine the utility of the dynamic change and serial monitoring of the systemic immune inflammation index (SII), which was based on the numbers of patients’ lymphocytes (L), platelets (P), neutrophils (N) and defined as P*N/L, for predicting prognosis of patients with hepatocellular carcinoma (HCC) after curative resection.

Methods:

We conducted a prospective study of 163 patients with HCC who underwent curative resection at Zhongshan Hospital from January 2012 to May 2013. SII was calculated using data acquired before and approximately 1 month after surgery. An optimal cutoff value stratified patients into groups with high or low SII. Patients were classified into unfavorable and favorable groups using the dynamic change of the SII. Two groups that were further divided into four categories within the entire cohort and the low-risk subgroups were serially monitored for ≥6 months. Prognostic values of the SII and other factors were determined using the Kaplan-Meier method, the Cox proportional hazards model, and the receiver operating characteristics (ROC) curve.

Results:

The favorable group was likely to have cirrhosis, and the unfavorable group was likely to have larger tumors and a higher recurrence rate. Multivariate analysis revealed that tumor size and dynamic change of the SII were independent risk factors for early recurrence. Moreover, the predictive value of the SII was retained in α-fetoprotein (AFP)-negative and HBeAg-negative-HBV-DNA <2000 IU/mL subgroups. Further, the serial changes of the SII for recurrence and no recurrence groups were statistically significant.

Conclusions:

The dynamic change and serial monitoring of the SII represent new indicators for predicting the early recurrence of HCC determining advance optimal therapy in advance.
Impact of Economic Globalization on Income Inequality: Developed Economies vs Emerging Economies
Authors: Baek Inmee , Shi Qichao
Published: March 2016

This paper studies income inequality and globalization by decomposing economic globalization into trade intensity and financial integration, and also by differentiating the effect of globalization across developed and developing countries. Using panel data on 26 developed countries and 52 developing countries for the 1990–2010 period when globalization was accelerated, this study finds that financial integration affects the income inequality differently from trade intensity and the effect is in contrast across two groups of countries. For example, an increase in trade intensity would widen income inequality in developed countries, but it would reduce the inequality in developing countries. And, a deepening of the financial integration would reduce the income inequality in developed countries but increase the inequality in developing countries. These results suggest that income inequality of developing countries would deteriorate with an imprudent dependence on foreign financing or a rapid opening up of their financial markets to foreign investors, or when faced with more barriers on free international trade.
Fluid evolution and mineralogy of Mn-Fe-barite-fluorite mineralizations at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in Germany
Authors: Majzlan Juraj , Brey-Funke Maria , Malz Alexander , Donndorf Stefan , Milovský Rastislav
Published: March 2016

Numerous small deposits and occurrences of Mn-Fe-fluorite-barite mineralization have developed at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in central Germany. The studied mineralizations comprise the assemblages siderite+ankerite-calcite-fluorite-barite and hematite-Mn oxides-calcite-barite, with the precipitation sequence in that order within each assemblage. A structural geological analysis places the origin of the barite veins between the Middle Jurassic and Early Cretaceous. Primary fluid inclusions contain water vapour and an aqueous phase with NaCl and CaCl2 as the main solutes, with salinities mostly between 24–27 mass. % CaCl2 eq. Th measurements range between 85 °C and 160 °C in barite, between 139 °C and 163 °C in siderite, and between 80 °C and 130 °C in fluorite and calcite. Stable isotopes (S, O) point to the evaporitic source of sulphur in the observed mineralizations. The S,C,O isotopic compositions suggest that barite and calcite could not have precipitated from the same fluid. The isotopic composition of the fluid that precipitated barite is close to the sea water in the entire Permo–Mesozoic time span whereas calcite is isotopically distinctly heavier, as if the fluids were affected by evaporation. The fluid evolution in the siliciclastic/volcanic Rotliegend sediments (as determined by a number of earlier petrological and geochemical studies) can be correlated with the deposition sequence of the ore minerals. In particular, the bleaching of the sediments by reduced Rotliegend fluids (basinal brines) could be the event that mobilized Fe and Mn. These elements were deposited as siderite+ankerite within the Zechstein carbonate rocks and as hematite+Mn oxides within the oxidizing environment of the Permian volcanic and volcanoclastic rocks. A Middle-Jurassic illitization event delivered Ca, Na, Ba, and Pb from the feldspars into the basinal brines. Of these elements, Ba was deposited as massive barite veins.
Rhinocerotidae from the Upper Miocene deposits of the Western Pannonian Basin (Hungary): implications for migration routes and biogeography
Authors: Pandolfi Luca , Gasparik Mihály , Magyar Imre
Published: March 2016

Although the rhinoceros remains have high biochronological significance, they are poorly known or scarcely documented in the uppermost Miocene deposits of Europe. Several specimens collected from the Upper Miocene (around 7.0 Ma, Turolian) deposits of Kávás (Pannonian Basin, Western Hungary), previously determined as Rhinoceros sp., are revised and described in this paper. The postcranial remains of these specimens belong to “Dihoplus” megarhinus (de Christol) on the basis of the morphological and morphometric characters of humerus, radii, metacarpal and metatarsal elements. An overview of rhinoceros remains from several uppermost Miocene localities and the revision of the rhinoceros material from the Pannonian Basin suggest that “D.” megarhinus spread during the latest Miocene from the Pannonian Basin towards Italy. The occurrences of this species in Western Hungary and Italy during the latest Miocene further imply that Rhinocerotini species were biogeographically segregated between Western, Southern and Central Europe.
Neotethyan rifting-related ore occurrences: study of an accretionary mélange complex (Darnó Unit, NE Hungary)
Authors: Kiss Gabriella B. , Oláh Erika , Zaccarini Federica , Szakáll Sándor
Published: March 2016

The geology of the NE Hungarian Darnó Unit is rather complicated, as it is composed mostly of a Jurassic accretionary mélange complex, according to the most recent investigations. The magmatic and sedimentary rock blocks of the mélange represent products of different evolutionary stages of the Neotethys; including Permian and Triassic sedimentary rocks of marine rifting related origin, Triassic pillow basalt of advanced rifting related origin and Jurassic pillow basalt originated in back-arc-basin environment. This small unit contains a copper-gold occurrence in the Permian marly-clayey limestone, an iron enrichment in the Triassic sedimentary succession, a copper-silver ore occurrence in Triassic pillow basalts and a copper ore indication, occurring both in the Triassic and Jurassic pillow basalts. The present study deals with the Cu(-Ag) occurrence in the Triassic basalt and the Fe occurrence in the Triassic sedimentary succession. The former shows significant similarities with the Michigan-type mineralizations, while the latter has typical characteristics of the Fe-SEDEX deposits. All the above localities fit well into the new geological model of the investigated area. The mineralizations represent the different evolutionary stages of the Neotethyan rifting and an epigenetic, Alpine metamorphism-related process and their recent, spatially close position is the result of the accretionary mélange formation. Thus, the Darnó Unit represents a perfect natural laboratory for studying and understanding the characteristic features of several different rifting related ore forming processes.
Assessment of Equivalence of Small and Large Orifice Computational Models
Authors: Kubrak Michał
Published: March 2016

The aim of this paper was to analyze theoretical aspects of calculating steady water flow through unsubmerged circular orifices. Theoretical analysis shows that the values of discharge obtained by using formulas intended for small orifices are greater than those calculated using formulas for large orifices. These differences attain a maximum value when the water level reaches the upper edge of the orifice, and decrease when water head increases. It has been proven that the volumetric flow rate for circular unsubmerged orifices can be calculated by formulas for small orifices when the water level above the center of gravity is at least four times as high as the diameter of the orifice.
Experimental Analysis of Horizontal Turbulence of Flow over Flat and Deformed Beds
Authors: Termini Donatella
Published: March 2016

Laboratory experiments in a straight flume were carried out to examine the evolution of large-scale horizontal turbulent structures under flat-bed and deformed-bed conditions. In this paper, the horizontal turbulence of flow under these conditions is analyzed and compared. The conditioned quadrant method is applied to verify the occurrence of turbulent events. The distributions of horizontal Reynolds shear stress and turbulent kinetic energy are also presented and discussed. Results show the occurrence of an “initial” sequence of horizontal vortices whose average spatial length scales with the channel width. Under deformed-bed conditions, this spatial length does not change.
Compaction/Liquefaction Properties of Some Model Sands
Authors: Sawicki Andrzej , Mierczyński Jacek , Sławińska Justyna
Published: March 2016

The compaction/liquefaction characteristics of two model sands are determined experimentally. One sand (Istanbul) is used in shaking table investigations, and the other (Dundee) in geotechnical centrifuge experiments. Both types of these highly sophisticated experiments are planned to be applied to test theories of seabed liquefaction. The first step of these experiments is to determine the parameters of model soils, which is the main goal of this paper.
Effect of MgO and MnO on Phosphorus Utilization in P-Bearing Steelmaking Slag
Authors: Lin Lu , Bao Yan-Ping , Wang Min , Li Xiang
Published: March 2016

In order to recycle the phosphorus in P-bearing converter slag and make it used as slag phosphate fertilizer, the effect of MgO and MnO in P-bearing steelmaking slag on phosphorus existence form, P2O5 solubility and magnetic separation behavior were researched systematically. The results show that the phosphorus in slag is mainly in the form of n2CaO · SiO2–3CaO · P2O5 (for short nC2S–C3P) solid solution in the P-rich phase for CaO-SiO2-FetO-P2O5-X (X stands for MgO and MnO, respectively). And the increasing of MgO and MnO content has no influence on precipitation of nC2S–C3P solid solution in slag, MnO and MgO mainly enter into RO phase and base phase to form MnFe2O4 and MgFe2O4, which has little effect on the P2O5 content of P-rich phase, so which has little effect on the degree of phosphorus enrichment and phosphorus occurrence form of the P-bearing slag. And adding MgO and MnO into CaO-SiO2-P2O5-Fe2O3 slag system can break the complex net structure formed by Si–O on certain degree, and also hinder the precipitation of β-Ca3(PO4)2 crystal with low citric acid solubility during the melting–cooling process. Therefore, adding appropriate MgO and MnO content into slag can improve the slag P2O5 solubility, but the effect of different amounts of MgO and MnO on the P2O5 solubility has little difference. Meanwhile, adding MgO and MnO into slag can improve the metallization of slag and magnetism of iron-rich phase, make the magnetic substances content increase and separation of phosphorus and iron incomplete, so it is adverse to phosphorus resources recovery from P-bearing slag by magnetic separation method. In order to recycle the phosphorus in P-bearing converter slag, the MgO and MnO content in the P-bearing slag should be controlled in the steelmaking process.
First–Order Transfer Sections with Reconnection–Less Electronically Reconfigurable High–Pass, All–Pass and Direct Transfer Character
Authors: Sotner Roman , Jerabek Jan , Herencsar Norbert , Prokop Roman , Lahiri Abhirup , Dostal Tomas , Vrba Kamil
Published: March 2016

Presented research introduces active filtering circuits which allow change of the transfer type without necessity of reconnection of the input or output terminal that can be very useful for on-chip applications. Our attention is focused on simple first-order filters that allow high-pass response (HP), all-pass response (AP) and also direct transfer (DT) with constant magnitude and phase characteristics between two terminals (input and output) by adjusting of one controllable parameter (current gain B in our case). Useful modification of the well-known current follower transconductance amplifier (CFTA), the so-called Z-copy current-controlled current follower differential input transconductance amplifier (ZC-CCCFDITA) and adjustable current amplifier were utilized in these circuits. Interesting possibilities (crossing between several transfer functions) of presented circuits require different values of B to obtain desired transfer function that is very important for practice and selection of specific way of control. Requirements on value of this continuously controllable gain B differ among presented structures. Theory is supported by simulation and measurement results with behavioral models utilizing commercially available active elements and simulation results with active elements based on CMOS models.
Synchronous Generator Model Parameter Estimation Based on Noisy Dynamic Waveforms
Authors: Berhausen Sebastian , Paszek Stefan
Published: March 2016

In recent years, there have occurred system failures in many power systems all over the world. They have resulted in a lack of power supply to a large number of recipients. To minimize the risk of occurrence of power failures, it is necessary to perform multivariate investigations, including simulations, of power system operating conditions. To conduct reliable simulations, the current base of parameters of the models of generating units, containing the models of synchronous generators, is necessary. In the paper, there is presented a method for parameter estimation of a synchronous generator nonlinear model based on the analysis of selected transient waveforms caused by introducing a disturbance (in the form of a pseudorandom signal) in the generator voltage regulation channel. The parameter estimation was performed by minimizing the objective function defined as a mean square error for deviations between the measurement waveforms and the waveforms calculated based on the generator mathematical model. A hybrid algorithm was used for the minimization of the objective function. In the paper, there is described a filter system used for filtering the noisy measurement waveforms. The calculation results of the model of a 44 kW synchronous generator installed on a laboratory stand of the Institute of Electrical Engineering and Computer Science of the Silesian University of Technology are also given. The presented estimation method can be successfully applied to parameter estimation of different models of high-power synchronous generators operating in a power system.
Organ-specific autoimmunity in relation to clinical characteristics in children with long-lasting type 1 diabetes
Authors: Głowińska-Olszewska Barbara , Michalak Justyna , Łuczyński Włodzimierz , del Pilar Larosa Maria , Chen Shu , Furmaniak Jadwiga , Smith Bernard Rees , Bossowski Artur
Published: March 2016

The aim of this study was to assess the prevalence of diabetes and other organ-specific autoantibodies (Ab) associated with various autoimmune conditions, in Polish children with type 1 diabetes mellitus (T1DM).

In this study 114 patients, aged 13.4 years, with mean diabetes duration 5.2 years were included. Ab to islet cell antigens: glutamic acid decarboxylase (GAD), insulinoma antigen 2 (IA-2), zinc transporter 8 (ZnT8), together with thyroid peroxidase Ab (TPO Ab), thyroglobulin Ab (Tg Ab), tissue transglutaminase Ab (tTG Ab) and 21-hydroxylase Ab (21-OH Ab) were measured.

The prevalence of at least one diabetes associated Ab was found in 87%, with the highest prevalence of 64% for ZnT8 Ab. In patients with disease duration <5 years, at least one antibody was present in 90%, the most prevalent was ZnT8 Ab (72%). In patients with duration >10 years, 50% had at least one antibody. The prevalence of other than islet cell autoimmunity was high (34%). Thyroid Ab were detected in 26% patients, 42% in girls vs. 8% in boys, p<0.001. tTG Ab were found in 11% patients, with a greater prevalence in children with early onset (p=0.01). 21-OH Ab were found in 2.6% T1DM patients.

Islet Ab were found in most T1DM children and remained positive even 10 years after onset. ZnT8 Ab emerged as an important marker for the diagnosis of T1DM in the Polish children. Screening for non-diabetes Ab in T1DM may be helpful in identifying subclinical cases of autoimmune thyroid, celiac or Addison’s disease (AD).
Prooxidant-antioxidant balance in patients with phenylketonuria and its correlation to biochemical and hematological parameters
Authors: Tavana Somayeh , Amini Sabrieh , Hakhamaneshi Mohammad Saeed , Andalibi Pedram , Hajir Mohammd Saleh , Ardalan Azin , Abdi Mohammad , Fathollahpour Asadollah
Published: March 2016

The balance between reactive oxygen species production and antioxidant activity has an important role in oxidative stress associated diseases such as phenylketonuria (PKU). We aimed in this study to evaluate the possible association between oxidative balance and clinical features of PKU patients.

Twenty patients and 50 healthy subjects were selected. Prooxidant-antioxidant balance (PAB) was measured and phenylalanine (Phe), tyrosine (Tyr), Phe/Tyr ratio and hematological indices were determined.

A significantly higher PAB value was observed in the patient group (152.0±14.1 HK unit) compared to the controls (88.1±13.88 HK) (p<0.05). There was significant correlation between PAB with serum Phe, Tyr, Phe/Tyr ratio, white blood cells (WBC) and red blood cells (RBC) counts.

The serum PAB values were higher in patients with PKU and this was associated with the serum Phe and Tyr and Phe/Tyr ratio. Therefore, because of its low cost and simplicity to perform, PAB value might be considered as a useful monitoring marker among the other tools in these patients.
Combined screening test for trisomy 21 – is it as efficient as we believe?
Authors: Wiechec Marcin , Nocun Agnieszka , Knafel Anna , Wiercinska Ewa , Sonek Jiri , Rozmus-Warcholinska Wioletta , Orzechowski Maciej , Stettner Dominika , Plevak Petr
Published: March 2016

Objectives:

To compare two first-trimester screening strategies: traditional combined screening and the one based on ultrasound markers only. We investigated the effect of maternal age (MA) on the screening performance of both of these strategies.

Methods:

This was a prospective observational study based on a non-selected mixed-risk population of 11,653 women referred for first-trimester screening. The study population was divided in two groups: combined screening (CS) and ultrasound-based screening (US). Absolute risk was calculated to determine the influence of MA on screening performance.

Results:

The CS arm comprised 5145 subjects including 51 cases of trisomy 21 (T21), and the US arm comprised 5733 subjects including 87 subjects with T21. Seven hundred and seventy-five subjects were excluded from the study. For a false positive rate (FPR) of 3%, the detection rate (DR) of T21 in CS arm was 78% vs. 90% in US arm. For 5% FPR, DR was 84% and 94% in CS and US arm, respectively. MA had an influence on DR positive rates in CS: both DR and FPR for T21 increased with advance in MA.

Conclusions:

The US protocol showed higher DR of T21 compared to the CS one. It may be considered as a viable alternative to CS for T21 where access to biochemical testing is limited.
Precís of A Natural History of Human Thinking
Authors: Tomasello Michael
Published: March 2016

A précis of Michael Tomasello, A Natural History of Human Thinking (Harvard University Press, 2014).
A Two-Step Theory of the Evolution of Human Thinking
Authors: Satne Glenda
Published: March 2016

Social accounts of objective content, like the one advanced by Tomasello (2014), are traditionally challenged by an ‘essential tension’ (Hutto and Satne 2015). The tension is the following: while sociality is deemed to be at the basis of thinking, in order to explain sociality, some form of thinking seems to be necessarily presupposed. In this contribution I analyse Tomasello’s two-step theory of the evolution of human thinking vis-à-vis this challenge. While his theory is in principle suited to address it, I claim that the specifics of the first step and the notion of perspective that infuse it are problematic in this regard. I end by briefly sketching an alternative.
Replies to Guala and Gallotti
Authors: Epstein Brian
Published: March 2016

This article responds to comments by Francesco Guala and Mattia Gallotti on The Ant Trap. In the replies, I address the relation of new advances in cognitive science to the study of collective attitudes, clarify distinct questions we might ask about grounding and about anchoring in social ontology, defend various forms of pluralism about grounds and about anchors, and discuss the type-token distinction as it applies to social entities.
Crystal structure of diaquabis(μ2-biphenyl-2,2′-dicarboxylato-κ2
O:O′)bis(1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylato)zinc(II), C60H56N6Zn2O16F2
Authors: An Zhe , Zhu Ling , Zhao Xin-Hua
Published: March 2016

C60H56N6Zn2O16F2, triclinic, P1̅ (no. 2), a = 9.4907(15) Å, b = 11.6769(19) Å, c = 13.905(2) Å, α = 110.882(2)°, β = 101.247(2)°, γ = 92.841(2)°, V = 1400.1(4) Å3, Z = 1, R
gt
(F) = 0.0328, wR
ref
(F
2
) = 0.1104, T = 293 K.
Crystal structure of bis(guanidinium) 3,3′-oxybis(6-carboxybenzoate), C18H20N6O9
Authors: Wu Xiangxiang , Liu Xianghua
Published: March 2016

C18H20N6O9, triclinic, P1̅ (no. 2), a = 7.0287(13) Å, b = 10.188(2) Å, c = 15.349(3) Å, α = 86.513(3)°, β = 88.854(3)°, γ = 75.047(3)°, V = 1060.0(3) Å3, Z = 2, R
gt
(F) = 0.0427, wR
ref
(F
2
) = 0.1409, T = 296(2) K.
Comparison of phytoremediation potential of three grass species in soil contaminated with cadmium
Authors: Gołda Sylwia , Korzeniowska Jolanta
Published: March 2016

The aim of the study was to compare the toleration of Poa pratensis, Lolium perenne and Festuca rubra to cadmium contamination as well as the phytoremediation potential of these three species of grass. The pot experiment was conducted in four replications in pots containing 2.0 kg of soil. The soil was contaminated with three doses of Cd – 30, 60 and 120 mg·kg−1. After two months, the aerial parts of plants were harvested. The roots were dug up, brushed off from the remaining soil and washed with water. The biomass was defined and the cadmium concentration was determined in aerial parts and roots. The phytoremediation potential of grasses was evaluated using biomass of grasses, bioaccumulation factor (BF) and translocation factor (TF). All three tested species of grasses had TF < 1 and BF-root > 1. It indicates their suitability for phytostabilisation and makes them unsuitable for phytoextraction of Cd from the soil. Comparing the usefulness of the tested grasses for phytoremediation has shown that the phytostabilisation potential of P. pratensis was lower than that of L. perenne and F. rubra. P. pratensis was distinguished by higher TF, smaller root biomass and lower tolerance for Cd excess in the soil in comparison with the two other test grasses. At the same time, L. perenne was characterised by the smallest decrease in biomass and the largest Cd accumulation in roots at the lowest dose of Cd. It indicates good usefulness for phytostabilisation of soils characterised by a relatively small pollution by cadmium.
Phytoplankton in the ecological status assessment of European lakes – advantages and constraints
Authors: Pasztaleniec Agnieszka
Published: March 2016

Although the phytoplankton indices describing the response of phytoplankton to the eutrophication have been developed and used for many years in the routine lake monitoring programme in some countries, the implementation of the Water Framework Directive (WFD) [EC, 2000] stimulated the development and improvement of quite a number of the current WFD-compliant phytoplankton-based methods. This paper is a review of the current phytoplankton-based methods for assessing the ecological status of European lakes. The particular attention was paid to the ways of solving problems arising from the need to reflect the complex and dynamic plankton algal communities on a numerical scale in order to gain reliable information about the state of the ecosystem.
Toxicity of coke wastewater treated with advanced oxidation by Fenton process supported by ultrasonic field
Authors: Kwarciak-Kozłowska Anna , Krzywicka Aleksandra
Published: March 2016

The aim of the presented study was to determine the toxicity of wastewater from the production of coke. The wastewater was treated with advanced oxidation involving ultrasonic field with Fenton’s reagent (the amplitude was 61.5 μm and sonication time 8 min). Two doses of iron and four doses of hydrogen peroxide were used. The amount of hydrogen peroxide was proportional to the value of the chemical oxygen demand of raw wastewater, ranging from COD/H2O2 ratio of 1:2.5 to 1:20. Two tests were used to determine the toxicity (algae growth inhibition test and Lepidium test). It was found that more toxic to algae was wastewater treated by Fenton’s reagent containing a higher dose of iron. A similar inhibitory effect was observed on the germination of cress seeds.
Qualitative analysis of irregular fields delivered with dual electron multileaf collimator: A Monte Carlo study
Authors: Inyang Samuel Okon , Chamberlain Alan
Published: March 2016

The use of a dual electron multileaf collimator (eMLC) to collimate therapeutic electron beam without the use of cutouts has been previously shown to be feasible. Further Monte Carlo simulations were performed in this study to verify the nature and appearance of the isodose distribution in water phantom of irregular electron beams delivered by the eMLC. Electron fields used in this study were selected to reflect those used in electron beam therapy. Results of this study show that the isodose distribution in a water phantom obtained from the simulation of irregular electron beams through the eMLC conforms to the pattern of the eMLC used in the delivery of the beam. It is therefore concluded that the dual eMLC could deliver isodose distributions reflecting the pattern of the eMLC field that was used in the delivery of the beam.
Prevalence of Obesity and Newly Diagnosed Diabetes in the Roma Population from a County in the South Part of Romania (Călăraşi County) -Preliminary Results
Authors: Enache Georgiana , Rusu Emilia , Ilinca Alexandra , Rusu Florin , Costache Adrian , Radulian Gabriela
Published: March 2016

Background and Aims: This study’s aim was to evaluate the prevalence of obesity and new cases of diabetes in Roma population compared to ethnic Romanian Caucasians from Călăraşi County in the south part of Romania.

Material and Methods: The population included in this study is part of a larger project that aims to evaluate the prevalence of obesity, prediabetes and diabetes in the Roma population from Călăraşi County. So far we have included 344 people: 180 Roma (119 female/61 male), and 164 non-Roma (108 female/56 male) aged between 18 and 85.

Results: In Roma population, the prevalence of underweight, normal weight, overweight and obesity was 4.4% (n=8), 37.2% (n=67), 26.7% (n=48) and 31.7% (n=57) respectively. In Romanian Caucasians, the prevalence of overweight and obesity was 37.2% (n=61) and 32.3% (n=53) respectively. Diabetes was diagnosed in 14.6% (n=24) of Romanian Caucasians and in 11.7% (n=21) of Roma population. Risk factors for obesity in Roma population were: lower socio-educational level, smoking, physical inactivity (active less than 30 min/day).

Conclusions: High prevalence of overweight (26.7%), obesity (31.7%) and new cases of diabetes (11.7%) among the Roma population in the south part of Romania, Calarasi County was an important finding of our study. We observed a negative effect of lifestyle behaviours on health-related outcomes: smoking, sedentariness, lower socio-educational level.
Odontoid fracture that is not listed in the existing classifications A new subtype of odontoid fracture: case report
Authors: Adam D. , Cergan R. , Iftimie D. , Moisescu Cristiana
Published: March 2016

Background: There is a significant variety of odontoid fracture classifications along with corresponding treatment strategies. There are though cases which cannot be framed within the existing classifications.

Clinical presentation: We report the case of a 91 years old female patient who suffered a cervical trauma secondary to a ground level fall. The cervical CT scan revealed a particular type of odontoid fracture, unframeable within existing classifications. The fracture line was at the base of the odontoid process and continued in an oblique trajectory through the right pedicle of the axis. As treatment strategy, we opted for external immobilization in a Minerva jacket and, after 3 months, the patient is symptom free, with partial bone fusion.

Conclusion: We named this rare case of odontoid fracture type II B for which external immobilization seems sufficient.
Subarachnoid hemorrhage mimicking acute myocardial infarction: case presentation
Authors: Ungureanu Raluca , Iacob Gabriel
Published: March 2016

We present a patient with a subarachnoid hemorrhage (SAH) on the computed tomography and electrocardiogram changes compatible with myocardial infarction. SAH is a medical emergency, but it can be initially misdiagnosed. Diagnosis may be delayed due to atypical presentations of SAH and this may endanger the life of the patient. Electrocardiogram abnormalities have been described previously in SAH and may obscure the correct diagnosis.