bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigations on Integrated Optical Interference Couplers in PMMA for Visible and Infrared Range Fabricated by “Direct Writing” Excimer Laser Radiation
Authors: Mirza Humza , Wu Bin , Tiedeken Sabine , Braun Volker , Josef Brückner Hans , Teubner Ulrich 
Published: July 2017

Abstract
Optical waveguides were generated in Polymethylmethacrylate using “direct” laser and contact mask structuring. Excimer laser radiation (248 nm) produced a local refractive index increase thereby achieving light guiding in waveguides with widths from 2 to 15
$\mu$m. The near field output images were analyzed using visible and infrared laser light. The mode fields of single mode structures were evaluated to elaborate numerically the parameters of the index profile. An index increase up to 0.01 could be achieved using laser pulses at fluences below
$0.15$
${\textrm{J/cm}^{2}}$. Thus it was possible to design interference couplers of 5
$\mu$m waveguides width for the visible (635 nm to 670 nm) as well as for the infrared range at 1550 nm. The coupling properties as a function of the waveguide separation and the wavelength is investigated and found compatible with numerical simulations for the structure design. The presented approach allows for designing and fabricating single mode couplers in an efficient and simple manner.
Mathematical Modeling of Thermofrictional Milling Process Using ANSYS WB Software
Authors: Sherov K.T. , Sikhimbayev M.R. , Sherov A.K. , Donenbayev B.S. , Rakishev A.K. , Mazdubai A.B. , Musayev M.M. , Abeuova A.M. 
Published: July 2017

Abstract
This article presents ANSYS WB-based mathematical modelling of the thermofrictional milling process, which allowed studying the dynamics of thermal and physical processes occurring during the processing. The technique used also allows determination of the optimal cutting conditions of thermofrictional milling for processing various materials, in particular steel 40CN2MA, 30CGSA, 45, 3sp. In our study, from among a number of existing models of cutting fracture, we chose the criterion first proposed by prof. V. L. Kolmogorov. In order to increase the calculations performance, a mathematical model was proposed, that used only two objects: a parallelepiped-shaped workpiece and a cutting insert in the form of a pentagonal prism. In addition, the work takes into account the friction coefficient between a cutting insert and a workpiece taken equal to 0.4 mm. To determine the temperature in the subcontact layer of the workpiece, we introduced the coordinates of nine characteristic points with the same interval in the local coordinate system. As a result, the temperature values were obtained for different materials at the studied points during the cutter speed change. The research results showed the possibility of controlling thermal processes during processing by choosing the optimum cutting modes.
Influence of Poroelasticity on the 3D Seismic Response of Complex Geological Media
Authors: Wuttke Frank , Dineva Petia , Fontara Ioanna-Kleoniki 
Published: July 2017

AbstractElastic wave propagation in 3D poroelastic geological media with localized heterogeneities, such as an elastic inclusion and a canyon is investigated to visualize the modification of local site responses under consideration of water saturated geomaterial. The extended computational environment herein developed is a direct Boundary Integral Equation Method (BIEM), based on the frequency-dependent fundamental solution of the governing equation in poro-visco elastodynamics. Bardet’s model is introduced in the analysis as the computationally efficient viscoelastic isomorphism to Biot’s equations of dynamic poroelasticity, thus replacing the two-phase material by a complex valued single-phase one. The potential of Bardet’s analogue is illustrated for low frequency vibrations and all simulation results demonstrate the dependency of wave field developed along the free surface on the properties of the soil material.
Theoretical Exploration of Exponential Heat Source and Thermal Stratification Effects on The Motion of 3-Dimensional Flow of Casson Fluid Over a Low Heat Energy Surface at Initial Unsteady Stage
Authors: Sandeep N. , Animasaun I.L. 
Published: July 2017

AbstractWithin the last few decades, experts and scientists dealing with the flow of non-Newtonian fluids (most especially Casson fluid) have confirmed the existence of such flow on a stretchable surface with low heat energy (i.e. absolute zero of temperature). This article presents the motion of a three-dimensional of such fluid. Influence of uniform space dependent internal heat source on the intermolecular forces holding the molecules of Casson fluid is investigated. It is assumed that the stagnation flow was induced by an external force (pressure gradient) together with impulsive. Based on these assumptions, variable thermophysical properties are most suitable; hence modified kinematic viscosity model is presented. The system of governing equations of 3-dimensional unsteady Casson fluid was non-dimensionalized using suitable similarity transformation which unravels the behavior of the flow at full fledge short period. The numerical solution of the corresponding boundary value problem (ODE) was obtained using Runge-Kutta fourth order along with shooting technique. The intermolecular forces holding the molecules of Casson fluid flow in both horizontal directions when magnitude of velocity ratio parameters are greater than unity breaks continuously with an increase in Casson parameter and this leads to an increase in velocity profiles in both directions.
Effects of a low FODMAP diet and specific carbohydrate diet on symptoms and nutritional adequacy of patients with irritable bowel syndrome: Preliminary results of a single-blinded randomized trial
Authors: Vincenzi Massimo , Del Ciondolo Irene , Pasquini Elisa , Gennai Katia , Paolini Barbara 
Published: July 2017

Abstract

Background and Objectives
IBS is the most common functional disease of the low gastrointestinal tract. Recently, the interest towards a diet approach has increased, for example, a diet with low content of fermentable oligosaccharides, disaccharides, monosaccharides and polyols (FODMAPs). The aim of the present study is to evaluate the efficacy of a low FODMAP diet and a specific carbohydrate diet (SCD) conducted for 3 months on symptoms and to evaluate the deficiencies of vitamin D and folic acid in patients affected by IBS, matching the Rome IV criteria.

Methods
We evaluated 73 patients divided into 2 groups: one submitted to low FODMAP diet and one to SCD, for 3 months. Patients were assigned to one of the 2 groups randomly and blinded. All the patients filled a visual analogue scale (VAS) to evaluate the severity of symptoms and a diary to evaluate the number of days with symptoms, and this was repeated after 3 months. Final evaluation was made by a blinded investigator.

Results
In the end, the patients with low FODMAP diet had a significant improvement in bloating and distension (P = 0.000); the group with SCD instead had a low but not a significant improvement. One way ANOVA showed comparable severity of symptoms in the 2 groups pre-diet (P = 0.215), but a difference in the same symptoms after 12 days (P = 0.000). Tukey test showed a significant improvement in the low FODMAP diet group and only a trend of improvement in the second group of SCD. The vitamin D mean value in both groups at the time of enrollment was 38 ng/mL; in the end, the mean value in the low FODMAP diet group was 32 ng/mL and in the SCD group was 22 ng/mL, with a statistically significant difference. The folic acid mean value at the time of enrollment was 18 mg/dL; in the end, the mean value in the low FODMAP diet group was 15 mg/dL and in the SCD group was 8 mg/dL, with a statistically significant difference.

Conclusion
Patients affected by IBS seem to have benefitted from a low FODMAP diet but not from an SCD, and a low FODMAP diet doesn’t seem to cause vitamin D and folic acid deficiencies.
Upper gastrointestinal bleeding in patients with end stage renal disease: causes, characteristics and factors associated with need for endoscopic therapeutic intervention
Authors: Laeeq Syed Mudassir , Tasneem Abbas Ali , Hanif Farina M. , Luck Nasir Hassan , Mandhwani Rajesh , Wadhva Rajesh 
Published: July 2017

Abstract

Background and Objectives
The risk of upper gastrointestinal bleeding (UGIB) is increased among the end-stage renal disease (ESRD) patients. The aim of the current study was to describe the causes and characteristics of UGIB in ESRD patients at our center and to assess the need for endoscopic therapeutic intervention (ETI) using Rockall (RS) and Glasgow Blatchford scores (GBS).

Material and Methods
All patients with ESRD and UGIB with age ≥14 years were included. Frequencies and percentages were computed for categorical variables. Chi square test or Fischer’s exact test was used for statistical analysis.

Results
A total of 59 subjects had a mean age of 47.25 ± 15 years.The most common endoscopic findings seen were erosions in 33 (55.9%) patients, followed by ulcers in 18 (30.3%) patients. ETI was required in 33 (55.9%) patients, which included adrenaline injection in 19 (32.3%), hemoclip in 9 (15.2%) and argon plasma coagulation in 5 (8.4%) patients. Factors associated with the need of ETI were identified as: a combined presentation of hematemesis and melena (P=0.033), ulcer (P=0.002) and associated chronic liver disease (P=0.015). Six (10.1%) patients died. Death was more common if ETI was not performed (P=0.018).

Conclusion
ETI was more commonly required in patients on maintenance hemodialysis with UGIB, who had presence of combined hematemesis and melena, ulcers and associated chronic liver disease. A Glasgow Blatchford score of >14 was helpful in assessing the need for ETI in these patients.
Costs of lactation to body condition and future reproduction of free-ranging mule deer Odocoileus hemionus (Cervidae)
Authors: Bender Louis C. , Hoenes Brock D. 
Published: July 2017

Abstract
We compared indices of nutritional condition and size between lactating and dry ≥2.5-year-old mule deer Odocoileus hemionus from three free-ranging populations in the Southwestern USA to quantify the energetic costs of lactation on endogenous energy reserves, determine whether differences persisted over winter, and assess carryover effects on future reproduction. In autumn, dry and lactating females differed in 77% of comparisons of condition and 20% of comparisons of size among population-years. In all significant comparisons, dry females were in better condition than lactating, and were smaller. Accrual of fat reserves was affected by lactation more than were protein reserves or size, but of those variables in which dry females differed from lactating in autumn, differences were lost by spring in 100% of cases. Accrual of some indices of condition was negatively affected by consecutive years of full lactations, but this effect was small compared to the overall magnitude of the lactation effect. Neither pregnancy, litter size, birth mass, nor survival of fawns to 30 days or to weaning were affected by previous successful reproduction, while birth date showed a weak positive effect. Likely because of convergence in condition overwinter, the negative influence of lactation on condition did not have a significant carryover effect on future reproduction. Because our study populations experienced moderate to severe nutritional stress, lack of a carryover effect is likely valid for most mule deer populations.
Effect of ADC Resolution on Low-Frequency Electrical Time-Domain Impedance Spectroscopy
Authors: Namin Reyhaneh L. , Ashtiani Shahin J. 
Published: July 2017

AbstractIn this paper, the effect of the resolution of an analogue-to-digital converter (ADC) on the accuracy of timedomain low-frequency electrical impedance spectroscopy is examined. For the first time, we demonstrated that different wideband stimuli signals used for impedance spectroscopy have different sensitivities to the resolution of ADC used in impedance spectroscopy systems. We also proposed Ramp and Half-Gaussian signals as new wideband stimulating signals for EIS. The effect of ADC resolution was studied for Sinc, Gaussian, Half-Gaussian, and Ramp excitation signals using both simulation and experiments. We found that Ramp and Half-Gaussian signals have the best performance, especially at low frequencies. Based on the results, a wideband electrical impedance spectroscopy circuit was implemented with a high accuracy at frequencies bellow 10 Hz.
Verification of a Novel Method of Detecting Faults in Medium-Voltage Systems with Covered Conductors
Authors: Mišák Stanislav , Hamacek Štefan , Bartłomiejczyk Mikołaj 
Published: July 2017

AbstractThis paper describes the use of new methods of detecting faults in medium-voltage overhead lines built of covered conductors. The methods mainly address such faults as falling of a conductor, contacting a conductor with a tree branch, or falling a tree branch across three phases of a medium-voltage conductor. These faults cannot be detected by current digital relay protection systems. Therefore, a new system that can detect the above mentioned faults was developed. After having tested its operation, the system has already been implemented to protect mediumvoltage overhead lines built of covered conductors.
Modelling of Mechanical Behaviour of High-Frequency Piezoelectric Actuators Using Bouc-Wen Model
Authors: Kędra Rafał , Rucka Magdalena 
Published: July 2017

AbstractThe paper presents application of a modified, symmetrical Bouc-Wen model to simulate the mechanical behaviour of high-frequency piezoelectric actuators (PAs). In order to identify parameters of the model, a two-step algorithm was developed. In its first stage, the mechanical parameters were identified by taking into account their bilinear variability and using a square input voltage waveform. In the second step, the hysteresis parameters were determined based on a periodic excitation. Additionally, in order to reduce the influence of measurement errors in determination of selected derivatives the continuum wavelet transform (CWT) and translation-rotation transformation (TRT) methods were applied. The results proved that the modified symmetrical Bouc-Wen model is able to describe the mechanical behaviour of PAs across a wide frequency range.
Modelling of Influence of Hypersonic Conditions on Gyroscopic Inertial Navigation Sensor Suspension
Authors: Korobiichuk Igor , Karachun Volodimir , Mel’nick Viktorij , Kachniarz Maciej 
Published: July 2017

AbstractThe upcoming hypersonic technologies pose a difficult task for air navigation systems. The article presents a designed model of elastic interaction of penetrating acoustic radiation with flat isotropic suspension elements of an inertial navigation sensor in the operational conditions of hypersonic flight. It has been shown that the acoustic transparency effect in the form of a spatial-frequency resonance becomes possible with simultaneous manifestation of the wave coincidence condition in the acoustic field and equality of the natural oscillation frequency of a finite-size plate and a forced oscillation frequency of an infinite plate. The effect can lead to additional measurement errors of the navigation system. Using the model, the worst and best case suspension oscillation frequencies can be determined, which will help during the design of a navigation system.
Novel Variable Structure Measurement System with Intelligent Components for Flight Vehicles
Authors: Shen Kai , Selezneva Maria S. , Neusypin Konstantin A. , Proletarsky Andrey V. 
Published: July 2017

AbstractThe paper presents a method of developing a variable structure measurement system with intelligent components for flight vehicles. In order to find a distinguishing feature of a variable structure, a numerical criterion for selecting measuring sensors is proposed by quantifying the observability of different states of the system. Based on the Peter K. Anokhin’s theory of functional systems, a mechanism of “action acceptor” is built with intelligent components, e.g. self-organization algorithms. In this mechanism, firstly, prediction models of system states are constructed using self-organization algorithms; secondly, the predicted and measured values are compared; thirdly, an optimal structure of the measurement system is finally determined based on the results of comparison. According to the results of simulation with practical data and experiments obtained during field tests, the novel developed measurement system has the properties of high-accuracy, reliable operation and fault tolerance.
Impedance Sensors Made in PCB and LTCC Technologies for Monitoring Growth and Degradation of Pseudomonal Biofilm
Authors: Chabowski Konrad , Junka Adam F. , Piasecki Tomasz , Nowak Damian , Nitsch Karol , Smutnicka Danuta , Bartoszewicz Marzenna , Moczała Magdalena , Szymczyk Patrycja 
Published: July 2017

AbstractThe suitability of low-cost impedance sensors for microbiological purposes and biofilm growth monitoring was evaluated. The sensors with interdigitated electrodes were fabricated in PCB and LTCC technologies. The electrodes were golden (LTCC) or gold-plated (PCB) to provide surface stability. The sensors were used for monitoring growth and degradation of the reference ATCC 15442 Pseudomonas aeruginosa strain biofilm in invitro setting. During the experiment, the impedance spectra of the sensors were measured and analysed using electrical equivalent circuit (EEC) modelling. Additionally, the process of adhesion and growth of bacteria on a sensor’s surface was assessed by means of the optical and SEM microscopy. EEC and SEM microscopic analysis revealed that the gold layer on copper electrodes was not tight, making the PCB sensors susceptible to corrosion while the LTCC sensors had good surface stability. It turned out that the LTCC sensors are suitable for monitoring pseudomonal biofilm and the PCB sensors are good detectors of ongoing stages of biofilm formation.
Leakage Current Degradation Due to Ion Drift and Diffusion in Tantalum and Niobium Oxide Capacitors
Authors: Kuparowitz Martin , Sedlakova Vlasta , Grmela Lubomir 
Published: July 2017

AbstractHigh temperature and high electric field applications in tantalum and niobium capacitors are limited by the mechanism of ion migration and field crystallization in a tantalum or niobium pentoxide insulating layer. The study of leakage current (DCL) variation in time as a result of increasing temperature and electric field might provide information about the physical mechanism of degradation. The experiments were performed on tantalum and niobium oxide capacitors at temperatures of about 125°C and applied voltages ranging up to rated voltages of 35 V and 16 V for tantalum and niobium oxide capacitors, respectively. Homogeneous distribution of oxygen vacancies acting as positive ions within the pentoxide layer was assumed before the experiments. DCL vs. time characteristics at a fixed temperature have several phases. At the beginning of ageing the DCL increases exponentially with time. In this period ions in the insulating layer are being moved in the electric field by drift only. Due to that the concentration of ions near the cathode increases producing a positively charged region near the cathode. The electric field near the cathode increases and the potential barrier between the cathode and insulating layer decreases which results in increasing DCL. However, redistribution of positive ions in the insulator layer leads to creation of a ion concentration gradient which results in a gradual increase of the ion diffusion current in the direction opposite to the ion drift current component. The equilibrium between the two for a given temperature and electric field results in saturation of the leakage current value. DCL vs. time characteristics are described by the exponential stretched law. We found that during the initial part of ageing an exponent n = 1 applies. That corresponds to the ion drift motion only. After long-time application of the electric field at a high temperature the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5. Here, the equilibrium between the ion drift and diffusion is achieved. The process of leakage current degradation is therefore partially reversible. When the external electric field is lowered, or the samples are shortened, the leakage current for a given voltage decreases with time and the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5, thus the ion redistribution by diffusion becomes dominant.
Controllability of the Strongly Damped Wave Equation with Impulses and Delay
Authors: Leiva Hugo 
Published: July 2017

Abstract
Evading fixed point theorems we prove the interior approximate controllability of the following semilinear strongly damped wave equation with impulses and delay in the space Z1/2 = D((−Δ)1/2)×L2(Ω),where r > 0 is the delay, Γ = (0, τ)×Ω, ∂Γ = (0, τ) × ∂Ω, Γr = [−r, 0] × Ω, (ϕ,ψ) ∈ C([−r, 0]; Z1/2), k = 1, 2, . . . , p, Ω is a bounded domain in ℝℕ(ℕ ≥ 1), ω is an open nonempty subset of , 1 ω denotes the characteristic function of the set ω, the distributed control u ∈ L2(0, τ; U), with U = L2(Ω),η,γ, are positive numbers and f , Ik ∈ C([0, τ] × ℝ × ℝ; ℝ), k = 1, 2, 3, . . . , p. Under some conditions we prove the following statement: For all open nonempty subsets Ω of the system is approximately controllable on [0,τ]. Moreover, we exhibit a sequence of controls steering the nonlinear system from an initial state (ϕ (0), ψ(0)) to an ε-neighborhood of the final state z1 at time τ > 0.
Playing the game and speaking the right language: Language policy and materiality in a bilingual preschool activity
Authors: Martín-Bylund Anna 
Published: July 2017

AbstractWhat are the material-semiotic relationships between a language policy and a table game activity in a bilingual preschool? Using Actor-Network Theory (ANT), the aim of this article is to explore this question, working with both human and nonhuman aspects of the activity, symmetrically, at the same level. The game playing activity takes place at a bilingual, Spanish-Swedish preschool in Sweden, which adopts a 50-50 approach in daily interaction. In interplay with video recordings, field notes and Actor-Network Theory, four different actor-network scenes of the activity are produced. Children, teacher, game pieces, die, cards, linguistic and other elements are described in the same language, as well as symmetrically drawn together in material-semiotic relations. The results indicate that the activity revolves mainly around two different, multilayered, and sometimes conflicting interests: to play the game and to speak the right language. The article describes the interrelatedness between these interests and how bilingualism emerges, transforms and becomes temporarily different in the relations of the actor-network. The approach opens up new avenues for understanding different constructions of bilingualism not in terms of a flexible-separate dichotomy but as entangled with one another in material-semiotic relations, which may illuminate creative potentials in the relations of policy and practice rather than implementation.