bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanism of thorium biosorption by the cells of the soil fungal isolate Geotrichum sp. dwc-1
Authors: Ding Congcong , Feng Su , Li Xiaolong , Liao Jiali , Yang Yuanyou , An Zhu , Wu Qiqi , Zhang Dong , Yang Jijun , Tang Jun , Zhang Jie , Liu Ning 
Published: January 2014

Abstract
In order to understand the impact of microorganisms on the
fate of thorium in soils, we investigated the thorium biosorption behavior
and the corresponding mechanisms by the cells of Geotrichum sp. dwc-1, one of the
dominant species of fungal group isolated from 3.5 m depth soil layer in
Southwest China. It was observed that fast thorium adsorption onto cells of
G. sp. dwc-1 could take place, with a high distribution coefficient
K
d (0.93 mL/mg) obtained, when Geotrichum sp. dwc-1and thorium concentrations were
5 g/L and 10 mg/L, respectively. The thorium biosorption behavior was
dependent on the pH value, and the lower pH could disrupt cell membrane of
G. sp. dwc-1. At pH 1, thorium was accumulated in the cytoplasmic region of
the cells. When pH was higher than 1, thorium was adsorbed on the cell
surface of G. sp. dwc-1, like in periplasmic region or in the outer membrane.
FTIR study combined with biosorption experiments further indicated that the
thorium distribution and binding behavior on cell surface were associated
with amino, hydroxyl groups and phosphate or sulphur functional groups, and
might also be governed by electrostatic interaction. Moreover, PIXE and EPBS
showed that ion-exchange mechanism contributed to the thorium biosorption
process, in which the tetravalent thorium ions replaced smaller counter-ions
(K+, Ca2+ and Fe3+) occuring on the cell surface.
Isolation of Cu radionuclides with dithizone impregnated XAD-8
Authors: Dolley S. G. , van der Walt T. N. 
Published: January 2014

Abstract
A novel separation method for Cu radionuclides from proton
bombardment of natZn is presented. A solid phase extraction procedure
using a modified dithizone (diphenylthiocarbazone) XAD-8 chelating resin was
used for the purification of the Cu radionuclides from up to 5 g of
natZn and other radionuclides. More than 95% of the Cu
radionuclides was recovered.
Chemical behavior of neptunium in the presence of technetium in nitric acid media
Authors: Zhou Xianming , Ye Guo-an , Zhang Hu , Li Li , Luo Fangxiang , Meng Zhaokai 
Published: January 2014

Abstract
The chemical behavior of Np is influenced by many factors, such as U(IV), hydrazine, Pu and Tc, which coexist in U/Pu
separation stage of PUREX process. Firstly, the reduction of Np(V) to Np(IV) by Tc(IV) was studied in nitric acid media, and the rate
equation could be expressed as − d[Np(V)]/dt = k[Np(V)][Tc(IV)]0.8[HNO3]1.2,
k = 28.5 ± 0.9 (L/mol)2/min at 25 ℃, the activation energy was
E
a = 70.0 kJ/mol. Thereafter, the chemical behavior of Np was investigated in aqueous nitric acid solution
containing Tc(VII), U(IV) and N2H4. Np(V) was reduced to Np(IV) quickly, Tc(VII) was reduced to Tc(IV) and U(IV) was oxidized
to U(VI) at the same time. Thereafter Np(IV) was entirely reoxidized to Np(V) when U(IV) and hydrazine were completely consumed. The
fast reduction of Np(V) was mainly ascribed to Tc(IV). In addition, Tc(VII) and nitric acid had little influence on the fast oxidation
of Np(IV).
Research on vacuum brazing of W-Cu composite to stainless steel with Cu-Mn-Co brazing metal
Authors: Liang Qiuhui , Xia Chunzhi , Xu Xiangping , Zou Jiasheng 
Published: January 2014

AbstractThis thesis is a discussion on obtaining a vacuum brazing joint of W-Cu alloy and 18-8 stainless steel with Cu-Mn-Co filler metal under the process parameter of a brazing temperature of 1060°C and holding time of 1 h. Four-point bending strength was tested at room temperature. Microstructure, microhardness, and element distribution near the interface of the brazed seam were observed via micro sclerometer, scanning electron microscope (SEM), and energy disperse spectroscopy (EDS) methods. Finally, analysis of the existence for phase composition near the interface was conducted using X-ray diffraction. Corresponding to a four-point bend strength of 780 MPa, there was a plain-interface, dense microstructure without obvious microdefects that formed. Microhardness values increased near the interface of the brazed joint and decreased gradually to the center of the brazed seam. Element distribution indicated that elements (Cu, Mn, Co) from the filler metal diffused into the interface or even substrates, and Fe and Cu element, together with a little of W element, from the substrates dissolved into the brazed seam region. Fracture morphology of the W-Cu/18-8 steel joint was identified as a mixed feature of fracture type. Moreover, the brazing seam contained mainly a Cu-rich phase, W0.4Cu0.6, α-Fe, and simple substance of W, together with a little of Co0.7Fe0.3.
On adhesive binding optimization of elastic homogeneous rod to a fixed rigid base as a control problem by coefficient
Authors: Jilavyan Samvel H. , Khurshudyan Asatur Zh. , Sarkisyan Areg S. 
Published: January 2014

Abstract
The problem of finite, partially glued to a fixed rigid base rod longitudinal vibrations damping by optimizing adhesive structural topology is investigated. Vibrations of the rod are caused by external load, concentrated on free end of the rod, the other end of which is elastically clamped. The problem is mathematically formulated as a boundary-value problem for onedimensional wave equation with attenuation and variable controlled coefficient. The intensity of adhesion distribution function is taken as optimality criterion to be minimized. Structure of adhesion layer, optimal in that sense, is obtained as a piecewise-constant function. Using Fourier real generalized integral transform, the problem of unknown function determination is reduced to determination of certain switching points from a system of nonlinear, in general, complex equations. Some particular cases are considered.
MULTI-EDIP – an intelligent software package for computer-aided multivariate signal and system identification
Authors: Kasprzyk Jerzy , Figwer Jarosław 
Published: January 2014

Abstract
In the paper an intelligent software package MULTI-EDIP for computer-aided identification of multivariate signals and systems is presented. Purposes and main requirements for computer-aided identification are discussed. A summary of the most important MULTI-EDIP services with a focus on expert advice is described. An example of using the package in electroacoustic plant identification for active noise control system development is presented.
The trace fossil Lepidenteron lewesiensis (Mantell, 1822) from the Upper Cretaceous of southern Poland
Authors: Jurkowska Agata , Uchman Alfred 
Published: January 2014

ABSTRACT
Jurkowska, A. and Uchman, A. 2013. The trace fossil Lepidenteron lewesiensis (Mantell, 1822) from the Upper Cretaceous of southern Poland. Acta Geologica Polonica, 63(4), 611-623. Warszawa.
Lepidenteron lewesiensis (Mantell, 1822) is an unbranched trace fossil lined with small fish scales and bones, without a constructed wall. It is characteristic of the Upper Cretaceous epicontinental, mostly marly sediments in Europe. In the Miechow Segment of the Szczecin-Miechow Synclinorium in southern Poland, it occurs in the Upper Campanian-Lower Maastrichtian deeper shelf sediments, which were deposited below wave base and are characterized by total bioturbation and a trace fossil assemblage comprising Planolites, Palaeophycus, Thalassinoides , Trichichnus, Phycosiphon, Zoophycos and Helicodromites that is typical of the transition from the distal Cruziana to the Zoophycos ichnofacies. L. lewesiensis was produced by a burrowing predator or scavenger of fishes. The tracemaker candidates could be eunicid polychaetes or anguillid fishes.
Vojnovskytesidae – a new family of Mississippian Rugosa (Anthozoa)
Authors: Fedorowski Jerzy , Kullmann Jürgen 
Published: January 2014

ABSTRACT
Fedorowski, J. and Kullmann, J. 2013. Vojnovskytesidae - a new family of Mississippian Rugosa (Anthozoa). Acta Geologica Polonica, 63(4), 657-679. Warszawa.
Two new species of the genus Vojnovskytes Fedorowski, 2009, namely V. marcinowskii and V. arcuatus, and a new genus, Vojnimitor, based on the new species V. proiectus, all from Mississippian strata of northern Spain, are described. Vojnovskytes variabilis (Vojnovsky-Krieger, 1934), the type species for the genus from the lowermost Visean strata of southern Urals, also is discussed and illustrated. Characters displayed by the taxa mentioned permit introduction of a new family Vojnovskytesidae.
SELECTION OF OPTIMAL MACHINING STRATEGY IN THE MANUFACTURE OF ELEMENTS BOUNDED BY CURVILINEAR SURFACES
Authors: Czerech Łukasz 
Published: January 2014

Abstract
Increasing machining accuracy realized on CNC machine tools causes that the more frequently surfaces machined with this technique are not subject to further finishing processing and directly affects on the final quality of the product. Achieving geometric accuracy established by the constructor is the problem that modern technologists and CAD/CAM programmers have to faced with. The paper presents the influence of toolpath tolerance and machining strategy available in CAD/CAM software on the constituting process of technological surface layer for elements limited with curvilinear surfaces. The impact of the above mentioned parameters on the location and direction of geometrical deviations were also analyzed. Following article is part of research of the impact of selected technological parameters on the freeform surfaces geometric structure manufactured on CNC machines
SIMPLIFIED COLLISION DETECTION IN 4R SERIAL MANIPULATORS
Authors: Handke Artur 
Published: January 2014

Abstract
This paper concerns the problem of designating criteria for assessing the possibility of a collision between the elements of serial manipulators with three rotary joints allowing to flex the segments in common plane oriented by rotating the fourth connection. The issue of contactless and efficient functioning of described group of manipulators has been considered in the spatial system. Equations were derived determining the possibility of a collision between selected segments of both manipulators. Collision detection model isn’t based on the information from the tactile sensors, but only on the relative position between the segments of manipulators. Based on the parameters defining the collision, the search for method of impossible collision was set on designing level, in order to minimize the time needed to examine all possible scenarios of collisions between segments. The results were included in development of methods and algorithms for planning and controlling movements of finger modules in anthropomorphic manipulator during grasping objects of indeterminate shape.
DOUBLY PERIODIC SETS OF THIN BRANCHED INCLUSIONS IN THE ELASTIC MEDIUM: STRESS CONCENTRATION AND EFFECTIVE PROPERTIES
Authors: Sulym Heorhiy , Pasternak Iaroslav , Kutsyk Serhiy , Grodzki Wojciech 
Published: January 2014

Abstract
This paper considers the doubly periodic problem of elasticity for anisotropic solids containing regular sets of thin branched inclusions. A coupling principle for continua of different dimension is utilized for modeling of thin inhomogeneities and the boundary element technique is adopted for numerical solution of the problem. The branches of the inclusion can interact both inside the representative volume element and at the interface of neighbor representative elements. A particular example of the elastic medium reinforced by a doubly periodic set of I-beams is considered. Stress intensity and stress concentration inside and outside thin inclusions are determined. The dependence of the effective mechanical properties of the reinforced composite material on the volume fraction of the filament and its rigidity is obtained.
INFLUENCE OF SALIVA AND ITS SUBSTITUTES ON CORROSION OF SOME IMPLANT ALLOYS
Authors: Andrysewicz Edyta , Mystkowska Joanna , Dąbrowski Jan Ryszard , Och Ewa , Skolimowska Katarzyna , Klekotka Marcin 
Published: January 2014

Abstract
The purpose of this paper is evaluation of the influence of human saliva and its substitutes on the corrosion resistance of some implant alloys used in stomatology, which included: austenitic steel (316L), titanium alloy (Ti6Al4V), and cobalt alloy (CoCrMo). Corrosion studies were conducted by means of the potentiodynamic method with the application of the VoltaLab 21 kit with VoltaMaster 4 software. The reference electrode was a saturated calomel electrode (SCE), whereas the counter electrode was a platinum electrode. The results of conducted studies indicate an increased current density in the passive range on potentiodynamic curves of studied alloys in the environment of human saliva, and also in a commercial saliva solution - Mucinox. On the basis of conducted corrosion studies, it can be stated that in terms of corrosion resistance the developed saliva substitutes may constitute competitive solutions to commercial saliva substitutes. The prepared substitutes should be studied further from the perspective of practical application for patients. The original value of the paper is a proposition of new saliva substitutes.
REAL FLIGHT DEMONSTRATION OF PITCH AND ROLL CONTROL FOR UAV CANYON FLIGHTS
Authors: Kownacki Cezary 
Published: January 2014

Abstract
The paper presents results of an experiment prepared to validate the autonomous control of obstacle avoidance designed for a micro UAV to fly in urban canyons. The idea of the obstacle avoidance assumes usage of two miniature laser rangefinders responsible for obstacle detection and range measurement. Measured ranges from obstacles placed on both sides of UAV can be used to simultaneous control of desired roll and pitch angles. Such combination of controls allows achieving high agility of UAV, because during a maneuver of obstacle avoidance UAV can make a turn and climb at the same time. In the experiment, controls of roll and pitch angles were verified separately to ensure high reliability of results and clearance of UAV behavior in the real flight. Because of lack of appropriate objects, which can be used as obstacles, laser rangefinders were directed vertically to the ground instead of the original horizontal configuration. So sensors determine ranges from the ground during a descent flight of UAV, and if their values are lower than defined threshold, it could be interpreted as obstacle detection. The experiment results present UAV behavior adequate to designed controls of roll and pitch angle. The vehicle turns in the opposite direction to the sensing axis of laser rangefinder detecting an obstacle and starts climbing when both sensors detect obstacles at the same range below the threshold.
CFD MODEL OF A MAGNETORHEOLOGICAL FLUID IN SQUEEZE MODE
Authors: Sapiński Bogdań , Szczęch Marcin 
Published: January 2014

Abstract
The study briefly outlines a CFD model of a magnetorheological (MR) fluid operated in squeeze mode with a constant interface area using the CFD (Computational Fluid Dynamics) approach. The underlying assumption is that the MR fluid is placed between two surfaces of which at least one can be subject to a prescribed displacement or a force input. The widely employed Bingham model, which fails to take into account the yield stress variations depending on the height of the gap, has been modified. Computation data obtained in the ANSYS CFX environment are compared with experimental results.
The use of Weibull Statistics to Quantify Property Variability in Fe-3Mn-0.8C Sinter-Hardened Structurally Inhomogeneous Steels
Authors: Cias A. , Czarski A. 
Published: January 2014

Abstract
Low carbon ferro-manganese and graphite powders were admixed to Hoganas sponge, NC100.24, and water atomised, ABC 100.30 and ASC 100.29, iron powders - to produce three variants of sintered Fe-3Mn-0.8C steel. These were pressed into tensile and bend specimens at 660 MPa, sintered in semi-closed containers for 1 hour in dry nitrogen or hydrogen at 1120 or 1250°C and cooled at 64°C/min. Both tensile strength and transverse rupture strength were examined using Weibull statistics. This paper presents the results of a study to develop and evaluate goodness of fit tests for the two- and three-parameter Weibull distributions. The study was initiated because of discrepancies in published critical values for two-parameter Weibull distribution goodness of fit tests and the lack of general three-parameter Weibull distribution goodness of fit tests for properties of PM steels.
Carbidic Bainitic and Ausferritic Ductile Cast Iron
Authors: Gumienny G. 
Published: January 2014

Abstract
This article presents new kinds of carbidic ductile cast iron with different microstructures of the metal matrix. This cast iron was obtained using the Inmold method nodularisation which guarantees strong refining of graphite and the metal matrix components. A different microstructure of the metal matrix of the cast iron was obtained without any thermal treatment (unwrought) by a suitable composition of alloy additives. It was shown that by adding molybdenum, chromium, nickel and copper it is possible to obtain in the cast iron metal matrix consisting of upper bainite, its mixture with lower bainite or ausferrite in the casts with the wall thickness of 3/25 mm. The process of cast iron crystallization is presented and described with the help of the thermal and derivative analysis (TDA) curves. It also shows the thermal effects from transformation of austenite in solid state.
The Effect of Dynamic Compression on the Evolution of Microstructure in Aluminium and its Alloys
Authors: Leszczyńska-Madet B. , Richert M. 
Published: January 2014

Abstract
In the work, the microstructure and selected properties of aluminium and its alloys (AlCu4Zr0.5, AlMg5, AlZn6Mg2.5CuZr) deformed with high strain rate were investigated. The cylindrical samples were compressed by a falling - weight-type impact-testing machine at the strain rate ranging from 1.77-6.06x102 s-1 in order to attain true strains between Φ = 0 - 0.62. After compression, the microhardness of the samples was tested and the microstructure was examined by means of both optical (LM) and transmission electron microscopy (TEM). Additionally the misorientation of selected microstructural elements using proprietary KILIN software was determined. The large density of shear bands, bands and microbands was the characteristic feature of the microstructure. The statistical width of the microbands observed in the microstructure was calculated using the mean chord method. The obtained data demonstrate reduction of the microbands width with the increase of deformation. The main object of investigations concerns the microstructure elements refinement affected by dynamic compression.
Perforation Test as an Accuracy Evaluation Tool for a Constitutive Model of Austenitic Steel
Authors: Moćko W. , Kowalewski Z.L. 
Published: January 2014

Abstract
In this paper, a new method for assessing the accuracy of a constitutive model is proposed. The method uses perforation test done by drop weight tower. The assessment is carried out by comparison of striker velocity curve obtained using experiment and FEM simulation. In order to validate proposed method the various constitutive equations were applied i.e. Johnson-Cook, Zerilli-Armstrong and the extended Rusinek-Klepaczko to model mechanical behaviour of X4CrMnN16-12 austenitic steel. The steel was characterized at wide range of strain and strain rates using servo-hydraulic testing machine and split Hopkinson pressure bar. The relative error calculated as a difference between measured and constitutive model based stress-strain curve was applied as a reference data (classic approach). Subsequently, it was compared with relative error determined on the basis of experimental and FEM calculated striker velocity (new approach). A good correlation between classic and a new method was found. Moreover, a new method of error assessment enables to validate constitutive equation in a wide range of strain rates and temperatures on the basis of a single experiment.
Diffusion of Boron in Cobalt Sinters
Authors: Borowiecka-Jamrozek J. , Lachowski J. 
Published: January 2014

Abstract
The paper describes the process of diffusion taking place at the surface of sinters produced from Co Extrafine powder after saturation with boron. Boronizing was performed at a temperature of 950°C for 6 and 12 hours by applying B4C powder as a depositing source, NH4Cl + NaF as an activator and Al2O3 as an inert filler. The study involved determining the diffusion coefficient, which required analyzing the microstructure and thickness of the layers and the process time. The images obtained with a Leica DM-4000 optical microscope revealed a two-phase structure of the boride layers. The presence of the two phases, i.e. CoB and Co2B, was confirmed by X-ray diffraction (XRD). A model of diffusion of boron atoms into the cobalt substrate was developed assuming the reaction diffusion mechanism. This model was used to calculate the diffusion coefficient. It required taking account of the interatomic potentials of boron and cobalt. The calculation results were compared with the experimental data concerning the diffusion of boron in other materials.
Quasi-Static and Dynamic Tensile Properties of Ti-6Al-4V Alloy
Authors: Wojtaszek M. , Sleboda T. , Czulak A. , Weber G. , Hufenbach W.A. 
Published: January 2014

Abstract
Ti-6Al-4V alloy is widely used, mainly in aircraft industry, due to its low density, excellent corrosion/oxidation resistance and attractive mechanical properties. This alloy has relatively low formability, so forming parts of complex geometries out of this alloy requires precisely controlled thermomechanical processing parameters. In industrial conditions Ti-6Al-4V alloy is usually processed by forging or extrusion. Ti-6Al-4V alloy is applied for structural parts of aircrafts, which are often exposed to variable loads and high or cyclically changing strain rates. Moreover, Ti-6Al-4V alloy is often used for structural parts providing good ballistic performance. That is why the knowledge of the mechanical behaviour of this alloy under dynamic conditions is important. This work is aimed at the analysis of Ti-6Al-4V alloy behaviour under quasi-static and dynamic deformation conditions. Both dynamic and quasi-static tensile tests were performed in this research. Moreover, ARAMIS system, a non-contact and material independent measuring system providing accurate 2D displacements, surface strain values and strain rates, was applied. The influence of tensile test strain rate on chosen mechanical properties of the investigated alloy was also discussed. The investigations showed a significant influence of processing strain rate on the mechanical behaviour of Ti-6Al-4V alloy.
Computer Modelling of Thermomechanical Phenomena in Pipes Welded using a Laser Beam
Authors: Piekarska W. , Kubiak M. , Saternus Z. , Rek K. 
Published: January 2014

Abstract
This study concerns numerical modelling and computer simulation of thermomechanical phenomena accompanying spiral welding of pipes made of stainless steel X5CrNi18-10 using a laser beam. Based on Abaqus FEA software, 3D numerical analysis was performed. Power distribution of spirally moving heat source was implemented into additional DFLUX subroutine, written in Fortran programming language. Thermomechanical properties of steel changing with temperature were taken into account in the analysis. The efficiency of material melting by different welding sources as well as the influence of heat load on the shape of melted zone, deformation of welded pipe and residual stress were examined.