bluuebunny/crossref_metadata_2025_split huggingface dataset:
Crossed modules as maps between connected components of topological groups
Authors: Farjoun Emmanuel D. , Segev Yoav 
Published: September 2016

Abstract
The purpose of this paper is to observe that a homomorphism of discrete groups

f
:

Γ
→
G

{f:\Gamma\to G}

arises as
the induced map

π
0

⁢

(
𝔐
)

→

π
0

⁢

(
𝔛
)

{\pi_{0}(\mathfrak{M})\to\pi_{0}(\mathfrak{X})}

on path components of some closed normal
inclusion of topological groups

𝔐
⊆
𝔛

{\mathfrak{M}\subseteq\mathfrak{X}}

if and only if
the map f can be equipped with a crossed module structure.
In that case an essentially unique realization

𝔐
⊆
𝔛

{\mathfrak{M}\subseteq\mathfrak{X}}

exists by homotopically discrete topological groups.
The results here are topological elaboration and exposition using existing simplicial techniques.
Some homological properties of category 𝒪. IV
Authors: Coulembier Kevin , Mazorchuk Volodymyr 
Published: September 2016

Abstract
We study projective dimension and graded length of structural modules in parabolic-singular blocks of the BGG category

𝒪

{\mathcal{O}}

.
Some of these are calculated explicitly, others are expressed in terms of two functions.
We also obtain several partial results and estimates for these two functions and relate them to monotonicity properties for quasi-hereditary algebras.
The results are then applied to study blocks of

𝒪

{\mathcal{O}}

in the context of Guichardet categories, in
particular, we show that blocks of

𝒪

{\mathcal{O}}

are not always weakly Guichardet.
An Analysis of the Impact of Valve Closure Time on the Course of Water Hammer
Authors: Kodura Apoloniusz 
Published: September 2016

Abstract
The knowledge of transient flow in pressure pipelines is very important for the designing and describing of pressure networks. The water hammer is the most common example of transient flow in pressure pipelines. During this phenomenon, the transformation of kinetic energy into pressure energy causes significant changes in pressure, which can lead to serious problems in the management of pressure networks. The phenomenon is very complex, and a large number of different factors influence its course. In the case of a water hammer caused by valve closing, the characteristic of gate closure is one of the most important factors. However, this factor is rarely investigated. In this paper, the results of physical experiments with water hammer in steel and PE pipelines are described and analyzed. For each water hammer, characteristics of pressure change and valve closing were recorded. The measurements were compared with the results of calculations perfomed by common methods used by engineers - Michaud’s equation and Wood and Jones’s method.
The comparison revealed very significant differences between the results of calculations and the results of experiments. In addition, it was shown that, the characteristic of butterfly valve closure has a significant influence on water hammer, which should be taken into account in analyzing this phenomenon. Comparison of the results of experiments with the results of calculations? may lead to new, improved calculation methods and to new methods to describe transient flow.
Possible Applications of Hardening Slurries with Fly Ash from Thermal Treatment of Municipal Sewage Sludge in Environmental Protection Structures
Authors: Falacinski Paweł , Szarek Łukasz 
Published: September 2016

Abstract
In Poland, in recent years, there has been a rapid accumulation of sewage sludge - a by-product in the treatment of urban wastewater. This has come about as a result of infrastructure renewal, specifically, the construction of modern sewage treatment plants. The more stringent regulations and strategic goals adopted for modern sewage management have necessitated the application of modern engineering methodology for the disposal of sewage sludge. One approach is incineration. As a consequence, the amount of fly ash resulting from the thermal treatment of municipal sewage sludge has grown significantly. Hence, intensive work is in progress for environmentally safe management of this type of waste.
The aim of the experiment was to evaluate the possibility of using the fly ash that results from municipal sewage sludge thermal treatment (SSTT) as an additive to hardening slurries. This type of hardening slurry with various types of additives, e.g. coal combustion products, is used in the construction of cut-off walls in hydraulic structures.
The article presents the technological and functional parameters of hardening slurries with an addition of fly ash obtained by SSTT. Moreover, the usefulness of these slurries is analysed on the basis of their basic properties, i.e. density, contractual viscosity, water separation, structural strength, volumetric density, hydraulic conductivity, compressive and tensile strength. The mandated requirements for slurries employed in the construction of cut-off walls in flood embankments are listed as a usefulness criteria.
The article presents the potential uses of fly ash from SSTT in hardening slurry technology. It also suggests directions for further research to fully identify other potential uses of this by-product in this field.
Photoluminescence Properties of Eu3+-activated Silicate Phosphors
Authors: Öztürk Esra 
Published: September 2016

AbstractThe silicate-type and Eu3+-activated Sr3SiO5 and Mg3SiO5 were prepared through the high temperature solid state reaction method under an open atmosphere. DTA/TG analysis was conducted to obtain information about the thermal behaviors of the mixed reactants. Using the DTA/TG results, the sintering process was achieved and the phase properties were characterized by X-ray diffraction (XRD). The effects of the same activator (Eu3+) and co-dopant (Dy3+) on the photoluminescence (PL) properties of the host lattices were investigated by using a photoluminescence spectrometer.
Simulation Model for Prediction of Transient Performance Characteristics of Single–Phase Shaded Pole Motor
Authors: Sarac Vasilija , Atanasova-Pacemska Tatjana 
Published: September 2016

Abstract
Paper proposes mathematical model of single phase shaded pole motor suitable for analysis of motor dynamic behavior. Derived mathematical model from d–q reference frame theory is applied at motor simulation model. Derived simulation model enables analysis of transient performance characteristics of motor currents, speed and electromagnetic torque under different operating regimes. Obtained results from the simulation are compared with data from analytical calculations based on method of symmetrical components and data from experiment for the purpose of verification of the simulation model. Simulation model is useful for studying the effect of parameters on motor starting and running characteristics at different types of loads.
Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter
Authors: Polak Josef , Jerabek Jan , Langhammer Lukas , Sotner Roman , Dvorak Jan , Panek David 
Published: September 2016

Abstract
This paper presents the simulations results in comparison with the measured results of the practical realization of the multifunctional second order frequency filter with a Digitally Adjustable Current Amplifier (DACA) and two Dual-Output Controllable Current Conveyors (CCCII +/−). This filter is designed for use in current mode. The filter was designed of the single input multiple outputs (SIMO) type, therefore it has only one input and three outputs with individual filtering functions. DACA element used in a newly proposed circuit is present in form of an integrated chip and the current conveyors are implemented using the Universal Current Conveyor (UCC) chip with designation UCC-N1B. Proposed frequency filter enables independent control of the pole frequency using parameters of two current conveyors and also independent control of the quality factor by change of a current gain of DACA.
Models of Pilot Behavior and Their Use to Evaluate the State of Pilot Training
Authors: Jirgl Miroslav , Jalovecky Rudolf , Bradac Zdenek 
Published: September 2016

Abstract
This article discusses the possibilities of obtaining new information related to human behavior, namely the changes or progressive development of pilots’ abilities during training. The main assumption is that a pilot’s ability can be evaluated based on a corresponding behavioral model whose parameters are estimated using mathematical identification procedures. The mean values of the identified parameters are obtained via statistical methods. These parameters are then monitored and their changes evaluated. In this context, the paper introduces and examines relevant mathematical models of human (pilot) behavior, the pilot-aircraft interaction, and an example of the mathematical analysis.
Identification of Nonlinear Cascade Systems with Noninvertible Piecewise Linear Input and Backlash Output Nonlinearities
Authors: Vörös Jozef 
Published: September 2016

Abstract
The paper deals with the parameter identification of cascade nonlinear dynamic systems with noninvertible piecewise linear input nonlinearities and backlash output nonlinearities. Application of the key term separation principle provides special expressions for the corresponding nonlinear model description that are linear in parameters. A least squares based iterative technique allows estimation of all the model parameters based on measured input/output data. Simulation studies illustrate the feasibility of proposed identification method.
Statistical Properties of Real–Time Amplitude Estimate of Harmonics Affected by Frequency Instability
Authors: Bellan Diego , Pignari Sergio A. 
Published: September 2016

Abstract
This work deals with the statistical characterization of real-time digital measurement of the amplitude of harmonics affected by frequency instability. In fact, in modern power systems both the presence of harmonics and frequency instability are well-known and widespread phenomena mainly due to nonlinear loads and distributed generation, respectively. As a result, real-time monitoring of voltage/current frequency spectra is of paramount importance as far as power quality issues are addressed. Within this framework, a key point is that in many cases real-time continuous monitoring prevents the application of sophisticated algorithms to extract all the information from the digitized waveforms because of the required computational burden. In those cases only simple evaluations such as peak search of discrete Fourier transform are implemented. It is well known, however, that a slight change in waveform frequency results in lack of sampling synchronism and uncertainty in amplitude estimate. Of course the impact of this phenomenon increases with the order of the harmonic to be measured. In this paper an approximate analytical approach is proposed in order to describe the statistical properties of the measured magnitude of harmonics affected by frequency instability. By providing a simplified description of the frequency behavior of the windows used against spectral leakage, analytical expressions for mean value, variance, cumulative distribution function, and probability density function of the measured harmonics magnitude are derived in closed form as functions of waveform frequency treated as a random variable.
Extra Mass Flux in Fluid Mechanics
Authors: Ván Peter , Pavelka Michal , Grmela Miroslav 
Published: September 2016

Abstract
The conditions of existence of extra mass flux in single-component dissipative nonrelativistic fluids are clarified. By considering Galilean invariance, we show that if total mass flux is equal to total momentum density, then mass, momentum, angular momentum and booster (center of mass) are conserved. However, these conservation laws may be fulfilled also by other means. We show an example of weakly nonlocal hydrodynamics where the conservation laws are satisfied as well although the total mass flux is different from momentum density.
Texture and composition of the Rosa Marina beach sands (Adriatic coast, southern Italy): a sedimentological/ecological approach
Authors: Moretti Massimo , Tropeano Marcello , Loon A.J. (Tom) van , Acquafredda Pasquale , Baldacconi Rossella , Festa Vincenzo , Lisco Stefania , Mastronuzzi Giuseppe , Moretti Vincenzo , Scotti Rosa 
Published: September 2016

Abstract
Beach sands from the Rosa Marina locality (Adriatic coast, southern Italy) were analysed mainly microscopically in order to trace the source areas of their lithoclastic and bioclastic components. The main cropping out sedimentary units were also studied with the objective to identify the potential source areas of lithoclasts. This allowed to establish how the various rock units contribute to the formation of beach sands. The analysis of the bioclastic components allows to estimate the actual role of organisms regarding the supply of this material to the beach. Identification of taxa that are present in the beach sands as shell fragments or other remains was carried out at the genus or family level. Ecological investigation of the same beach and the recognition of sub-environments (mainly distinguished on the basis of the nature of the substrate and of the water depth) was the key topic that allowed to establish the actual source areas of bioclasts in the Rosa Marina beach sands. The sedimentological analysis (including a physical study of the beach and the calculation of some statistical parameters concerning the grain-size curves) shows that the Rosa Marina beach is nowadays subject to erosion.
Isotope characterisation of deep aquifers in the Gwda catchment, northern Poland
Authors: Kotowski Tomasz , Satora Stefan 
Published: September 2016

Abstract
We present the results of isotope measurements (δ18O, δ D, δ13CDIC and 14C) and chemical analyses (TDS, TOC, HCO3
-, SO4
2-, Cl-, NO3
-, NH4
+, Ca2+, Mg2+ Na+ and K+) conducted on groundwater samples collected from deep Cenozoic aquifers. These aquifers are the basic source of drinking water at numerous localities within the study area in northern Poland. Most of the δ18O determinations are characterised by low variability (i.e., > 70 per cent of δ18O are between -9.5‰ and -9.2‰). In most cases tritium activity was not detected or its content slightly exceeded the uncertainty of measurement (from ±0.3 T.U. to ± 0.5 T.U.). On average, 14C activity is twice higher than that under similar conditions and in hydrogeological systems. The δ13CDIC values fall within the -13.6‰ to -12.8‰ range. A slight variability is observed when considering all isotope and chemical data within the study area and under these hydrogeological conditions. In general, the results of isotope and chemical analyses seem to be homogeneous, indicating the presence of closely similar groundwaters in the system, irrespective of geological formation. It is likely that there is a significant hydraulic connection between shallow and deep aquifers in the Gwda catchment, which indicates the potential for seepage of pollutants from shallow Pleistocene to deep Miocene aquifers. This can endanger the latter by e.g., high concentrations of NO3
-, SO4
2- and Cl- ions from shallow aquifers within the Gwda catchment.
The Influence of Preload on the Work of Angular Contact Ball Bearings
Authors: Kaczor Jarosław , Raczyński Andrzej 
Published: September 2016

Abstract
Optimum values of preload can be achieved in well-tried constructions and then applied in similar structures. For new structures, it is recommended to calculate the preload force and to test the correctness of calculation by means of experiments. In practice it may be necessary to introduce corrections, because not all real work parameters can be precisely known. Credibility of calculations depends, first of all, on the consistence between the assumptions concerning temperature conditions during work and elastic deformations of cooperating elements – first of all of a holder – and the real work conditions. The aim of the study is to determine how preload influences the work of a system of angular ball bearings, in relation to durability of bearing, moment of friction and rigidity of the bearing.
Performance Comparison of the Optimized Inverted Joined Wing Airplane Concept and Classical Configuration Airplanes
Authors: Sieradzki Adam , Dziubiński Adam , Galiński Cezary 
Published: September 2016

Abstract
The joined wing concept is an unconventional airplane configuration, known since the mid-twenties of the last century. It has several possible advantages, like reduction of the induced drag and weight due to the closed wing concept. The inverted joined wing variant is its rarely considered version, with the front wing being situated above the aft wing. The following paper presents a performance prediction of the recently optimized configuration of this airplane. Flight characteristics obtained numerically were compared with the performance of two classical configuration airplanes of similar category. Their computational fluid dynamics (CFD) models were created basing on available documentation, photographs and some inverse engineering methods. The analysis included simulations performed for a scale of 3-meter wingspan inverted joined wing demonstrator and also for real-scale manned airplanes. Therefore, the results of CFD calculations allowed us to assess the competitiveness of the presented concept, as compared to the most technologically advanced airplanes designed and manufactured to date. At the end of the paper, the areas where the inverted joined wing is better than conventional airplane were predicted and new research possibilities were described.
Evaluation of Early Surgical Treatment Results Considering Venous Leg Ulcers
Authors: Andrejuk Paulina , Błach Justyna , Dudek Ewa , Nogalski Adam 
Published: September 2016

AbstractLower leg ulcers are characterized by a chronic and recurrent course, being considered as a difficult therapeutic problem. Based on epidemiological data chronic ulcers concern 0.2 to 2% of the Western European population. The above-mentioned problem affects women more often than men, and increases with age. Treatment and recurrence prevention methods remain under discussion and research.The aim of the study was to evaluate the early surgical treatment results of venous leg ulcers at the Department of Traumatology and Emergency Medicine, Medical University of Lublin.Material and methods. We evaluated patients hospitalized at the Department of Traumatology and Emergency Medicine, Medical University of Lublin during the period between 2009-2014. Inclusion criteria were as follows: venous leg ulceration, full documentation. The study group comprised 62 patients subjected to treatment for leg ulcerations, including 35 women and 27 men, aged between 30 and 94 years. The treatment method included the excision of the ulcers with the deep fascia, and the implantation of the mesh graft (thickness of skin) directly into the exposed muscle.Results. Amongst patients evaluated at discharge, the healing of the transplant was as follows: in case of 44 patients 90-100%, in 8 patients - 75-89%, in 5 patients 50-74% and in 5 patients less than 50%. The predominating bacteria collected from ulceration samples was Pseudomonas aeruginosa (32%) and Staphylococcus aureus (35%).Conclusions. The patient outcome shows that surgery is an effective method considering treatment of venous leg ulcers. Earlier qualification for this type of surgery will improve patient outcome.
Evaluation of the Surgery Wound Healing Process Using Self–Adaptive Skin Suture or Mechanical Stapler
Authors: Sztuczka Ewa , Jackowski Marek , Żukowska Wioletta 
Published: September 2016

AbstractWound healing is a complex and time-phased process. The occurrence of numerous negative conditions as well as external factors have a significant influence on the risk of potential complications. Preparing the patient for surgery, attention should be paid to a number of factors determining the proper healing process.The aim of the study was to compare the results of the early period of surgical wound healing process with access via laparotomy using techniques, which are self-adaptive sutures and mechanical staplers used for skin closure.Material and methods. The study included 120 patients divided into three groups, according to the degree of wound continence, in accordance with the CDC (Center for Disease Control and Prevention). Exclusion criteria based on objective analysis were applied for patients with a higher risk of complications. In all cases the skin layer was closed with monofilament suture or single-patient use stapler. A ten-day observation of the wound healing process was implemented. The study was randomized.Results. In the case of patients groups identified as a “Clean Wound” and “ Clean / Infected Wound” no significant differences were discovered. In the group “Contaminated/Infected Wound” significantly higher percentage of wound-healing complications were reported (p < 0.05) for which monofilament sutures was used.Conclusions. The study showed, that mechanical stapler is recommended for contaminated/infected surgical wounds due to significantly lower risk of complications. In the case of wounds divided as a “Clean” and “Clean/Infected” type of suturing material has no significant effect on wound healing.
Assessment of Abdominal Belts Impact on the Lungs Ventilation and Their Application in Early Physiotherapy after Major Abdominal Surgery – Prospective Trial
Authors: Czyżewski Piotr , Hryciuk Dominika , Dąbek Aneta , Szczepkowski Marek 
Published: September 2016

AbstractEarly physiotherapy is an important part of the comprehensive treatment of patients after major abdominal surgery (MAS). Accelerated mobilization should be safe and requires the use of appropriate techniques. Most of the physiotherapists and surgeons recommends using abdominal belts. Opponents claim that belts have an adverse effect on lungs ventilation.The aim of the study was to determine the effect of abdominal belt on lung ventilation efficiency in the early period after MAS.Material and methods. The study involved 20 patients after MAS. Including 9 women and 11 men, aged between 40 to 90 years (x̅ 66.7). In the scheduled 7 patients and urgent 13. All of them were in the early period after surgery. Dynamic spirometry was performed twice in the postoperative period. For the first time wearing a belt, and then without the belt in the same group. Evaluated the forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and peak expiratory flow (PEF). For the analysis uses the Wilcoxon matched-pairs test and Spearman’s rank correlations. P values <0.05 were considered significant.Results. The value of the ventilation indicators measured wearing abdominal belt were slightly lower than the values evaluated without the belt. The results are shown in percent predicted for age and gender, FEV wearing belt 52%, without belt 53%; FEV1 59% vs 61%; PEF 46% vs 51%. There were no statistically significant differencesConclusions. There were no significant negative influence of abdominal belt on lungs ventilation in early period after MAS. There was no correlations between age, body mass index and changes in ventilation indicators.
Unity to the Greater Glory of God. Promising Paradigms in Current Ecumenism
Authors: Raedel Christoph 
Published: September 2016

Abstract
Rather than lamenting a crisis of the Ecumenical movement the author suggests that the reader look at promising paradigms that become apparent within the present changes and challenges of World Christianity. He identifies six promising trends, as Christians of different traditions recognize partners in common witness beyond their own church traditions (1), evangelical and Pentecostal churches rise in significance (2), ecumenism becomes increasingly shaped by biographical experience and personal encounter (3), a spiritual ecumenism for the witness in the world emerges (4), the reality of martyrdom deepens the sense of Christian unity (5) and the search for the truth of the Gospel is not given up (6). In their overlapping and sometimes contradictory evidence these paradigms prove Ecumenism to be alive and, therefore, changing its face.