bluuebunny/crossref_metadata_2025 huggingface dataset:
Routing of branched water distribution networks using fractal geometry and graph theory
Authors: Suchorab Paweł , Kowalski Dariusz
Published: January 2019

The necessity of ensuring precise and rigorous requirements of technical infrastructure elements determines development of software tools which should ease and simplify the process of designing. The routing of water distribution network (WDN) is one of the first steps in the design process of the whole water supply system. Similar design steps can be observed in other linear technical infrastructure systems, such as: electric networks or roads. Despite the fact that WDNs routing problem has been widely explored in scientific literature, the universal and optimal routing method is still being sought after. The following paper presents the exemplary application of an original software tool for the WDNs routing. The hybrid structure software, written in C++ and AutoLISP programming languages, is based on elements of fractal geometry and graph theory. Software allows semi-automatic routing process of single-source, branched networks and support a designer with mathematical substantiation of a selected solution. In the following paper, software was tested in conditions of a model settlement unit. The obtained results revealed potential of further application of software as well as disclosed weaknesses of a program.
Computer approximation of air gauge dynamic characteristics using the sine input test rig
Authors: Jakubowicz Michał , Rucki Mirosław , Siemiątkowski Zbigniew
Published: January 2019

The paper describes the test rig dedicated for air gauge dynamical characteristics assessment. The computerised system enables measurement of the amplitudes of back-pressure pk dependent on the input signal circular frequency ω. Dedicated software performs full control on the calibration procedure, which consists of setting a rotational speed and registration of measuring signal, and further data processing. Circular frequency ω was gradually changed with the appropriate step, in order to obtain a series of frequencies in the range from 0.1 to 20 Hz. The response of a measurement system was registered as a sinusoidal curve which after smoothening and interpolation procedures provided an amplitude-frequency graph with its main characteristics, such as time constant and the frequency f0.95 that generated dynamic error 5%. It was demonstrated that sine input dynamic calibration corresponds with real conditions of the in-process measurement with air gauges.
The study of human behaviour in a laboratory set-up with the use of innovative technology
Authors: Szymczyk Tomasz , Skulimowski Stanisław
Published: January 2019

Virtual reality technologies known since the 1990s have virtually disappeared. They have been replaced by their new editions characterised by a very faithful reproduction of details. The laboratory described in the article was created to study the intensity of various sensations experienced by a person in virtual worlds. A number of different scenarios have been developed that are designed to trigger specific reactions, to produce symptoms similar to those observed in arachnophobia, acrophobia or claustrophobia. The person examined can be equipped with a series of non-invasive sensors placed on the body in such a way that they do not interfere with immersion in VR. The laboratory instruments enable the acquisition and synchronisation of many signals. Body movement data is recorded by means of Kinect. Involuntary hand movements are measured with 5DT gloves. In addition, body temperature, ambient temperature and skin moisture are continuously monitored. Apart from recording the image from VR goggles, it is also possible to record the entire session on camera in 4K resolution in order to interpret facial expressions. The results are then analysed in detail and checked for patterns. The article describes both the test set-up itself as well as several test scenarios and presents the results of pilot studies.
Continuous glucose monitoring: review of promising technologies
Authors: Klimek Monika , Tulwin Tytus
Published: January 2019

Despite the progress we have made in the management of diabetes it is still incurable and aggravating disease affecting all domains of quality of life. Uncontrolled diabetes associated with hyperglycemia leads to serious microvascular and macrovascular long-term complications. The proper long-term glycemic control is a key strategy for preventing the development or slowing the progression of diabetes complications, thus there is a crucial role of new technologies in the diabetes care. New technologies in diabetology are developing dynamically in recent years and therefore this is a topical issue. In this paper we describe current and developing continuous glucose monitoring technologies and their usefulness in promoting optimal glycemic control, influence on personalized diabetes managements and the functioning of patients. Moreover we review knowledge about flash glucose monitoring and close-loop system. This review examines studies published before 31st August 2018.
Customer data collection with Internet of Things
Authors: Bojanowska Agnieszka
Published: January 2019

The purpose of this paper is to present the potential of Internet of Things (IoT) for customer data collection for Customer Relationship Management (CRM) systems. The Internet of Things technology finds numerous applications in company operations ranging from scheduling production tasks to supporting marketing activities. This article discusses the possibility of using Internet of Things to collect customer data. Examples have been presented that will allow detection of some dependencies between the use of this technology and the quality of received data, which may be subjected to analyses, inter alia, in the CRM system. There are also examples of solutions that can be successfully used by enterprises that want to process and analyse data about their clients and have difficulty in obtaining this data.
A concept of the air quality monitoring system in the city of Lublin with machine learning methods to detect data outliers
Authors: Cieplak Tomasz , Rymarczyk Tomasz , Tomaszewski Robert
Published: January 2019

This paper presents a concept of the air quality monitoring system design and describes a selection of data quality analysis methods. A high level of industrialisation affects the risk of natural disasters related to environmental pollution such ase.g.air pollution by gases and clouds of dust (carbon monoxide, sulphur oxides, nitrogen oxides). That is why researches related to the monitoring this type of phenomena are extremely important. Low-cost air quality sensors are more commonly used to monitor air parameters in urban areas. These types of sensors are used to obtain an image of the spatiotemporal variability in the concentration of air pollutants. Aside from their low price , which is important from a point of view of the economic accessibility of society, low-cost sensors are prone to produce erroneous results compared to professional air quality monitors. The described study focuses on the analysis of outliers as particularly interesting for further analysis, as well as modelling with machine learning methods for air quality assessment in the city of Lublin.
Application of neural network in determination of parameters for milling AZ91HP magnesium alloy with surface roughness constraint
Authors: Kulisz Monika , Zagórski Ireneusz
Published: January 2019

This paper presents the model for milling AZ91HP magnesium alloy with TiAlN coated carbide end mill. The model was developed on the basis of experimental data from the neural network training data set. The milling process was conducted at constant parameters of tool geometry, workpiece strength properties, technological machine properties, radial and axial depth of cut. The range of changeable machining parameters specified in this study included cutting speed, feed per tooth, and the output variable: the arithmetical mean roughness parameter (Ra). The process was modelled by means of MatLab software and its Neural Network Toolbox. The developed model was implemented in the algorithm designed to determine optimal milling conditions, exploring the space of acceptable parameters in search of those which would meet the specified roughness parameter at maximum efficiency.
Comparative Overview of Rough Set Toolkit Systems for Data Analysis
Authors: Pięta Piotr , Szmuc Tomasz , Kluza Krzysztof
Published: January 2019

Inconsistency, lacking values of attributes or parameters, as well as discrepancies between records caused by insufficient precision cannot always be managed in the initial phases of knowledge discovery,i.e., data preparation and refinement. The theory of rough sets aims to overcome problems that are caused by uncertainty and lack of precision within the gathered data sets. This approach is a useful tool that operates on a formal model using relational algebra, elementary operations on finite sets and first-order logic. In this paper, we present an analysis of existing rough set tools, namely: Rough Set Exploration System, Rough Sets Data Explorer, Rough Set Data Analysis Framework, Waikato Environment for Knowledge Analysis and Rough Set Toolkit for Analysis of Data. Our comparison is performed only theoretically and covers the available algorithms, preparation of input data, licensing, as well as installation requirements.
Optimisation Studies of Cylinder Water Channel Geometry in an Internal Combustion Engine
Authors: Biały Michał , Pietrykowski Konrad
Published: January 2019

This paper presents an analysis of the results of simulation studies of optimisation of water channel geometry placed in the head of an opposed-piston three-cylinder engine. For this purpose, six computation cases were prepared, differing in shape and cross-section field of channels located along the axis of one of the cylinders. The research was conducted by means of Ansys Flutent software. The conditions of initiation and boundary have been obtained from previous studies using AVL Boost RT software. A fixed temperature was assumed on the cylinder wall and a fixed temperature was assumed for the coolant at the inlet to the model. The studies were carried out for the model of the designed engine, which carries out a two-stroke diesel cycle. The engine will be equipped with direct injection of diesel fuel. On the basis of the conducted analysis of the test results, the flow velocity distributions and distributions of speed fields of the working medium in the critical cross-sections, the distribution of temperature and heat flow fields were prepared. Pressure drops and heat dissipation were also determined for individual models. This provided the basis for the determination of the influence of the rib's transverse geometry shape on the amount of heat received from the cylinder's smoothing walls.
Computational fluid dynamics simulation of thermal comfort in naturally ventilated room
Authors: Raczkowski Andrzej , Suchorab Zbigniew , Brzyski Przemysław
Published: January 2019

The paper presents experimental measurements and numerical simulation of thermal environment in naturally ventilated room by a fresh air valve. For the aim of Computer Fluid Dynamics (CFD) simulations, a model room was created. The fresh air valve is located in an occupied space, at the external wall. It has a major effect on mixing indoor and outdoor air, temperature profiles, thermal condition and indoor air quality of the rooms during the heating period. To determine the thermal condition of a naturally ventilated building, PN-EN 15251:2012 standard was used. According to the standard, using PMV/PPD is suitable for evaluating the thermal environment. In the naturally ventilated buildings, the following criteria are very important for local thermal discomfort: draught, radiant temperature asymmetry and vertical air temperature differences. To compare the simulation results, real air temperatures were measured by the thermocouples in a day room having the same geometry. A series of simulations has been carried out to determine the profiles of temperature and velocity of indoor air. Obtained results prove correlation with calculations of profiles of indoor air temperature, estimated using the thermocouples.
Computational analysis of solid particle-erosion produced by bottom ash slurry in 90° elbow
Authors: Singh Jashanpreet , Singh Jatinder Pal , Singh Mandeep , Szala Miroslaw
Published: January 2019

Present work is devoted to investigation of the slurry erosion wear in a 90° elbow by using commercial Computational fluid dynamics (CFD) code FLUENT. Discrete phase erosion wear model was used to predict erosion in 90° elbow by solving the governing equations through Euler-Lagrange scheme. Particle tracking was considered by using standard k-ε turbulence scheme for the flow of bottom ash slurry. Erosion wear in elbow was investigated along with velocity distribution and turbulence intensity. The radius-to-diameter (r/D) ratio was taken as 1.5. Results show that erosion rate increases with increase in velocity. Present numerical simulation model holds close agreement with previous studies. Distorted patterns appeared at low velocities. The V-shape pattern appeared on the outer wall of elbow at high velocities. The low velocity region occurs around circumference of elbow wall at outer wall of elbow due to stimulation of the drag forces near the wall region.
Electromagnetic simulation of low-pass birdcage coil
Authors: Mańko Monika
Published: January 2019

Magnetic resonance imaging (MRI) is a widely used non-invasive imaging modality that provides a variety of high-resolution soft-tissue contrast and functional information. The development of imaging technique employing the phenomenon of nuclear magnetic resonance is focused on obtaining the best possible tissue contrast, maximisation of ratio defined by signal-to-noise-ratio (SNR) and improving the image quality. SNR can be improved by the use of contrast agents and higher-field scanners, however these are better RF coils that often provide more significant gains. Using full-wave analysis and design tools becomes especially important when the coil dimensions approach a significant fraction of a wavelength. In this paper, modelling of RF coil is presented by using special-purpose software for electromagnetic simulations. The methodology of the research assumes making numerical calculations of RF coil. The presented approach of a design of radiofrequency (RF) coils for MRI scanners using lumped circuit modelling based techniques begins to fail at high frequencies, and therefore more accurate models based on the electromagnetic field calculations must be used. This paper presents simple simulations of the electric and magnetic field in LP birdcage coil.
Energetic Analysis of the Aircraft Diesel Engine
Authors: Grabowski Łukasz , Pietrykowski Konrad , Karpiński Paweł
Published: January 2019

The analysis of the distribution of thermal energy generated during the combustion process in internal combustion engines and the estimation of individual losses are important regarding performance and efficiency. The article analyses the energy balance of the designed two-stroke opposed piston diesel engines with offset, i.e. the angle by which the crankshaft at the side of exhaust ports is ahead of the crankshaft at the side of intake ports. Based on the developed zero-dimensional engine model, a series of simulations were performed in steady-state conditions using the AVL BOOST software. The values of individual energy losses, including cooling losses, exhaust gas losses, friction losses were obtained. The influence of decreasing and increasing the offset on the performance of the tested engine was analysed.
Green designing of solar hot water systems using computer simulations
Authors: Żelazna Agnieszka , Pawłowski Artur , Zdyb Agata
Published: January 2019

Solar thermal installations are one of the popular types of renewable energy sources. This paper presents the comparison of the considered design variants of the typical solar hot water installation on the basis of Life Cycle Assessment. The simulations and the design criteria included:- optimal angle of inclination and orientation of collectors for the selected location (simulations in GetSolar),- optimal type of collectors (simulations in SimaPro).Life cycle analysis of solar hot water systems shows that this technology has the potential to reduce the environmental impact of hot water preparation while compared to the conventional energy sources. However, the optimisation criteria used for green designing in the life cycle perspective can significantly improve the environmental balance of the analysed technologies.
The simulation model of the grapple loader operation
Authors: Tucki Karol , Bączyk Anna , Mruk Remigiusz , Wielewska Izabela , Radziszewski Piotr
Published: January 2019

The main objective of the study was to develop a simulation model for the operation of the T-214 CYKLOP grapple loader using the MATLAB package. The created model allowed assessment of the behaviour of the real object in the operating conditions under variable loads and in the system overload. The simulation of the boom operation was carried out in four combinations: (1) at power take-off speed = 1000 rpm without load and (2) at 1000 kg load, (4) at power take-off speed = 540 rpm without load and (4) at 1000 kg load. The results show that the system works properly. The correct functioning of the system is evidenced by the fact that changes in force and acceleration occur on both pistons when only one of the cylinders is operating (the cylinder at rest acts as a shock absorber for the forces resulting from the inertia of the arms and the load). Apart from the increased forces on the pistons of the hydraulic cylinders, the additional load resulted in a slight reduction in acceleration values and an increase in the time needed to change the arm tilt angles.
Reconstruction of road accident using video recording
Authors: Tarkowski Sławomir , Nieoczym Aleksander , Caban Jacek , Gardyński Leszek , Vrabel Jan
Published: January 2019

Presented was the procedure of reconstructing a motorcycle-motor car collision with both vehicles moving in the same direction and performing simultaneous manoeuvres: a left turn and overtaking. Because of the conflicting reports of witnesses, the procedure also involved recordings from a stationary video camera. These data allowed us to retrace the movement and manoeuvres of vehicles as a function of time and then to identity the perpetrator of the accident.
Analysis of the velocity distribution in the UVC module
Authors: Dumała Sławomira , Skwarczyński Mariusz , Staszowska Amelia
Published: January 2019

The study presents the capabilities of the AutoCad CFD 2016 program as an auxiliary tool in the design of indoor air purification devices. The purpose of this work was to verify the location of UVC lamps and the elements enabling equal distribution of the air in the sterilisation module. The analysis was carried out in two-dimensional space. Three air streams of 100, 200 and 300 m3/h were assumed. The research considered the construction of a module with three and four UVC lamps in different configurations and with the module being additionally equipped with an injector, a steering device, an injector and a stream obstructer. The results suggest that the equal air distribution in the module is guaranteed with the variation of 4 UVC lamps additionally equipped with the injector and steering device at the angle of 30o, as well as the variation with the injector and stream obstructer with the height of 9.5 mm.
Analysis of a dimensional tolerances’ series of 2PW-SE gear pumps using multi valued logical trees
Authors: Deptuła Adam , Osiński Piotr , Partyka Marian A.
Published: January 2019

Gear pumps of a prototype series 2PW-SEW belonging to II group were the research object. Wrocław University of Technology in co-operation with the company HYDROTOR S.A. designed the units. The experimental pump has been designed with taking into consideration technological possibilities of the company HYDROTOR S.A. The innovation of the prototype unit is based on using oblique gears with an involute tooth modified in the lower and upper part of the profile. The modification in the lower part was made using the so-called tooth root undercutting. Multivalent logic trees with designated rank of importance parameters structural/operational were used, considering the effect of tolerances construction. The area has been increased by cutting the oblique teeth. In order to determine the influence of the manufacturing technology on the level of the emitted noise, it has been decided to make gears using the shaving technology.
Gearbox damage identification using Ensemble Empirical Decomposition method
Authors: Jonak Kamil , Syta Arkadiusz
Published: January 2019

In this article, we have conducted a comparative analysis of vibration signals from helicopter aircraft propulsion transmissions, registered on an industrial research stand. We compared acceleration vibrations in the case of gears without physical damage and gears with one tooth missing. Based on recorded signals, we determined the values of indicators based on the statistical properties of signals and compared them with each other. For a more exact comparison, the distribution of the tested signals to the empirical modes using the EEMD (Ensemble Empirical Mode Decomposition) method was performed. This allows to treat individual modes as components of a signal at specific frequencies, and also prevents mixing of modes in individual components, which may take place in the classic EMD analysis. It should be noted that individual modes may correspond to characteristic frequencies for the operation of the transmission. When comparing the values of the most frequently used indicators, modes/frequencies in which the damage was most visible were indicated.
SCFs study of tubular T/Y steel joints under inplane loading
Authors: Kumar Lalitesh , Kumar Ajay , Barnat-Hunek Danuta , Szczygielska Elżbieta , Garbacz Monika
Published: January 2019

Stress concentration factors (SCFs) at welded tubular joints are one of the prime factors that affect the fatigue life of a structure. In the present work, finite element analysis (FEA) is used to find the hot spot stress and subsequently the stress concentration factors of Tubular T/Y steel Joints. Static axial tensile loading case is used in the present work. The circular hollow sections (CHS) are considered. The parametric study of the variation in SCF, with the change in joint angle (ϴ) and geometrical parameters such as β, τ, γ for T/Y-Joints subjected to inplane axial loading, is done. The validation of FE modelling technique of present work is done by comparing with the various SCFs equations available in the literature
The modelling and strength analysis of the endoprosthesis of the knee joint
Authors: Kępa Patrycja , Gajewski Jakub
Published: January 2019

The knee joint is the largest of all in the human body. It connects the femur, tibia and patella. It is a double-angled joint reinforced with ligaments and surrounded by a joint capsule. Because of the bandy leg or knock-knee, cartilage wear due to age or defective joint load, alloplastic surgery is required. This is a procedure planned individually for each patient depending on their age, gender or weight. To assess the scale of wear, knee cartilage was scanned using computed tomography. CT scans were processed into a 3D model using Materialize Mimics. Based on obtained bone models, a model of the endoprosthesis was designed using the Catia V5 software. Strength analysis was carried out based on the selection of appropriate materials and theoretically accepted loads.
Strength Analysis of the CNG Direct Injector for the Combustion Ignition Engine in Real Driving Conditions
Authors: Magryta Paweł , Gęca Michał , Biały Michał
Published: January 2019

The paper presents the results of strength test simulations of the CNG injector structure for direct injection of compression-ignition engines. This article is a continuation of the works presented in paper [1]. Life cycles estimation of particular parts of the injector were calculated using the Kocańda relation. The simulation tests of injector strength carried out earlier have allowed us to determine the stress concentration points. On the basis of NEDC driving tests carried out in three different cars, engine load histograms were made for subsequent runs and an average load profile was determined. For the points most exposed to damage,i.e.the needle and injector housing, the stress curve was generated as a function of time. This dependence was the base for fatigue calculations with the use of MatLab program in order to calculate the limit number of repetitions for a given injector element. All the calculation works have served to determine the maximum number of work cycles of a given injector design.
Statistical analysis of the water pollution indicators pertaining to treated municipal sewage introduced to the river
Authors: Majerek Dariusz , Duda Sylwia , Babko Roman , Widomski Marcin K.
Published: January 2019

The assessment of the ratio of self-purification processes in the natural environment, including the water bodies of streams and rivers is possible by the means of the numerical modelling. Nonetheless, the reliability of results of the qualitative numerical calculations may be affected by the quality of the collected input data and efficiency of the model calibration. The commonly required input data include pollutants characteristics and coefficients for empirical equations of their transport and decay, while calibration of a model requires series of measurements of selected pollutants concentration in water. This paper presents studies of concentration of pollutants measured in the treated sanitary wastewater discharged to the Bystrzyca river from municipal wastewater treatment plant, and their concentrations measured directly in the river, above and below the location of discharge point. The performed qualitative measurements of treated sewage discharged from municipal wastewater treatment plant and water of the Bystrzyca river included determination of COD, BOD5, N-NH4, N-NO2, N-NNO3, TKN, TN, TP and TSS concentration. The presented results of measurements are the first step in development and calibration of the model, allowing to successfully predict the influence of discharged sanitary wastewater on quality of water in the river.
Residual Stress Distribution Analysis in Advanced Materials by Neutron Diffraction: The Case of Spherical Storage Tank Butt Weld
Authors: Hervoches Charles , Vrána Miroslav , Mikula Pavol , Mráz Ľuboš , Baksa Peter , Baláž Milan
Published: January 2019

The two-axis diffractometer SPN-100 at the Center of Accelerators and Nuclear Analytical Methods (CANAM) in Řež, is a neutron diffraction instrument dedicated to residual stress analyses in polycrystalline materials, it has recently been equipped with a new two-dimensional position sensitive detector (2D-PSD) and a six-axis robotic arm for sample positioning. Recent results of strain/stress distribution measurements with the upgraded tools are presented. The measured materials are made of C-Mn unalloyed steel used for spherical storage tank. Welding-induced residual stresses have direct influence on ductility and toughness of both weld metal and heat affected zone of the weld area, which affect the service life time of structures. Normal, transversal and longitudinal components of the stresses obtained in the vicinity of the butt weld from a spherical storage tank were measured by neutron diffraction at CANAM.
Repair Delaminations in Carbon/epoxy Laminates
Authors: Amaro A.M. , Neto M.A. , Loureiro A.J.R. , Silva M.P. , Reis P.N.B.
Published: January 2019

Delaminations are the most typical damage in composite laminates, and the industrial community is continually searching new techniques to combine efficiency with cost benefits. Therefore, this work intends to analyse the application of screws on repair of composite laminates containing delaminations. It was found that this technique is beneficial for delaminations with lengths higher than 15 mm. For example, considering delaminations with 20 mm, the compressive load increases around 46.4% relatively to the delaminated samples. However, for small lengths, this technique is not viable due to the stress concentration induced by the hole.
Models of Geometrically “Stabilized” Laser Cavity
Authors: Aissani A. , Leghmizi S. , Battou K.
Published: January 2019

The Lamb-dip characterizing the line shape emitted by a gas laser is often used in spectroscopy of materials as a reference for frequency measurements. For such lasers, the frequency control is performed on the Lamb-dip. It is therefore essential, for accurate measurements, that its frequency matches with the laser resonance frequency. This is only possible if the emitted line shape is symmetrical, which is not usually the case. Indeed, the lens effects induced in the laser amplifying medium, which are due to the population and the saturation inhomogeneities, generally produce an asymmetrical emitted line shape. So, the frequency of the Lamb-dip is shifted compared to the central frequency.

In this work, we will first revisit the model given in the literature, in order to highlight the limit of its validity, and then we will propose through an appropriate choice of the cavity geometry, a "stabilized" cavity model giving rise to a symmetrical line shape even when the control parameters vary.
Experimental Evaluation and Numerical Modelling Residual Stresses in Glass Panel
Authors: Majak Jüri , Anton Johan , Õunapuu Erko , Auriemma Fabio , Pohlak Meelis , Eerme Martin , Klauson Aleksander
Published: January 2019

During last decade increased usage of laminated composite glass structures, also annealed and tempered glass can be observed in civil engineering, automobile and space structures, solar panels, etc. Latter trend is caused by high strength properties of laminated glass, also sound and vibration attenuation capabilities. However, heat treatment of glass causes residual stresses, which are not often covered in structural analysis. Current study is focused on experimental evaluation and numerical modelling of residual stresses in glass panels.
Effect of Fiber Volume Fraction on Behavior of Concrete Beams Made with Recycled Concrete Aggregates
Authors: Alnahhal Wael , Aljidda Omar
Published: January 2019

This study investigates the effect of using different volume fractions of basalt macro fibers (BMF) on the flexural behavior of concrete beams made with 100% recycled concrete aggregates (RCA) experimentally. A total of 4 reinforced concrete (RC) beam specimens were flexural tested until failure. The parameter investigated included the BMF volume fraction (0%, 0.5%, 1%, and 1.5%). The testing results of the specimens were compared to control beam specimen made with no added fibers. The experimental results showed that adding BMF improves the flexural capacity of the tested beams.
Antibacterial Effect of Ginseng/polyaniline Encapsulated in Poly(Lactic-co-glycolic Acid) Microcapsules Coating on Stainless Steel 316L
Authors: Lukman Siti Khadijah , Saidin Syafiqah
Published: January 2019

Implant infection is one the current complications of implant restoration. Incorporation of a material that possesses antibacterial property is crucial in combating implant infection. In this study, polyaniline (PANI) is incorporated in ginseng encapsulated poly (lactic-co-glycolic acid) (PLGA) microcapsules to equip the microcapsules with an antibacterial effect. The microcapsules are intended for drug delivery purpose as the ginseng is comprised of abundant therapeutic values and the PLGA is known for its degradation property. The microcapsules were coated on stainless steel 316L using an electro-deposition technique. The chemical composition, morphology and antibacterial activity of the samples were analyzed through ATR-FTIR, SEM and bacterial count test. A greater volume of microcapsules was coated on the stainless steel 316L with the addition of PANI through the appearance of intense ginseng (O–H and C=C bands) and PLGA (C=O) peaks on the ATR-FTIR spectra and through the visualization of spherical morphology of microcapsules on the pre-treated metal. The incorporation of PANI also has induced the antibacterial efficacy of the microcapsules to 87.64%. Therefore, PANI has served as an antibacterial agent that could be useful in the development of implant coating materials while driving the formation of ginseng encapsulated PLGA microcapsules.
The Corrosion Studies of Electron Beam Welded Nickel Alloy
Authors: Sroka M. , Jonda E. , Węglowski M. , Błacha S.
Published: January 2019

The paper presents the influence of electron - beam (EB) remelting effect on the surface layer electrochemical parameters obtained from potentiodynamic anodic polarization studies and impedance spectroscopy measurements for a set of Inconel 617 electron beam remelted obtained for different process parameters. The correlation between EBW process parameters and characteristic of surface oxide layer properties and resistance to the acidic environment were discussed. The electrochemical studies were supported by microstructural analysis of the remelted zone (RZ), heat affected zone (HAZ), native metal and observed precipitates formed under rapid solidification process. Both electrochemical technics applied to evaluate corrosion properties of remelted Inconel 617 evidenced a strong influence of the electron beam current on the corrosion resistance.
Oxidation Resistance of Modified Aluminide Coatings
Authors: Romanowska Jolanta , Zagula-Yavorska Maryana , Kolek Łukasz
Published: January 2019

The application of protective aluminide coatings is an effective way to increase the oxidation resistance of the treated parts and prolongs their lifetime. The addition of small amount of noble metals (platinum or palladium) or reactive elements such as: hafnium, zirconium, yttrium and cerium has a beneficial effect on oxidation behavior. This beneficial effect includes an improvement of adhesion of alumina scales and reduction of oxide scale growth rate. Platinum and hafnium or zirconium modified aluminide coating were deposited on pure nickel using the electroplating and CVD methods. The coatings consisted of two layers: an outer, β-NiAl phase and the interdiffusion γ’-Ni3Al phase. Palladium dissolved in the whole coating, whereas hafnium and zirconium formed inclusions on the border of the layers. Samples were subjected to cyclic oxidation test at 1100 °C for 200h. Oxidation resistance of the palladium, Hf+Pd and Zr+Pd modified coatings deposited on pure nickel does not differ significantly, but is better than the oxidation resistance of the non-modified one.
Study on the Psychotherapy of Martial Arts Yin-Yang Balance Mode for Negative Emotional Energy Conversion of Neurogenic Depression
Authors: Bilai Zhong
Published: January 2019

Objective:The Psychotherapy of Martial Arts’ Yin- Yang Balance mode to convert the negative Emotional Energy of neurodepressive patients was studied. Methodes: By using the self-rating depression scale (SDS) and self-rating anxiety scale (SAS) for pre-test and post-test. Results: The results showed that there were significant differences in depression and anxiety in patients with neurodepression before and after the test, and the emotions of depression and anxiety go from being serious back to normal state. The Psychotherapy of Martial Arts’ Yin- Yang Balance mode has significant effect on the negative emotional energy conversion of neurogenic depression.
The influence of chess training on pupils’ self-efficacy， self-esteem and social anxiety
Authors: Jianguo Peng , Wenying Jia , Zhigang Hu , Zhou Niu
Published: January 2019

Background With the 2001 announcement about three chess games in school, go, Chinese chess and chess, the three upsurge of popularity is set off in the country. Chess started late in China and was originally considered as an intellectual sport related to intelligence. Its role in psychological characteristics has not received enough attention from people. Objective In order to study the influence of chess training on pupils' self-efficacy, self-esteem and social anxiety. Methods 121 pupils from Jinding No.1 primary school are selected as study subjects and divided into experimental group and control group. The experiment group is the community group of 31 pupils, and the control group is the non-community group of 90 pupils. Using General Self-Efficacy Scale, Self-Esteem Scale, and Social Anxiety Scale for Children, the scales are used to test, and the pupils are observed and the teachers and parents are interviewed. Results
There are significant differences in self-efficacy, self-esteem and social anxiety between the community and the non-community pupils. Conclusion It shows that a certain intensity of chess training has a greater impact on pupils' self-efficacy, self-esteem and social anxiety.
Construction of School-based Mental Health Records System
Authors: Zhang Xinhua , Jia Yifan , Wang Juanjuan
Published: January 2019

With the extraordinary advancement of Chinese society, primary and secondary school students are currently facing increasingly serious mental health problems, and an effective and easy-to-use system needs to be constructed to promote students’ mental health in school. Here, we present theschool-based mental health records system, includingtesting and recording, detailed assessment, interventionandmental health training,based on psychological theories and empirical studies. Besides, techniques and theories of play therapy was adopted to construct this system. We also explore the operability and effectiveness of this system by testing it at a school in Guangzhou. In conclusion, it is a feasible way for schools in China constructing this system to solve students’ mental health problems.
Applying Play Therapy in Mental Health Services at Primary School
Authors: Zhang Anna , Jia Yifan , Wang Juanjuan
Published: January 2019

With Chinese economy developing rapidly, the pressure put on individuals and the number of special family type has been increasing dramatically, mental health problems therefor plaguing an increasing number of children. Because the school plays an important role on children’s psychological development, the social issue above can be solved most effectively in the school environment. Play therapy, a psychological therapy which is most suitable for children, can tackle students' cognitive, social and behavioral problems when applied at school. We also provide an idea of how to apply play therapy in the school environment.
Research on the Model of E-commerce Precision Poverty Alleviation Based on the Universities
Authors: Liu Xiyu , Wang Yisheng , Zheng Shi
Published: January 2019

The model of e-commerce precision poverty alleviation based on the universities emphasizes the important role of the combination of university platforms and e-commerce in precision poverty alleviation. It aims to solve the problems of talent shortage and unstable sales of poverty-reducing products in the precise poverty alleviation, and to form an effective method for poverty alleviation in poverty-stricken areas radiated by poor students in colleges and universities. This paper discusses the e-commerce precision poverty alleviation model based on universities by analyzing the existing research results and challenges of e-commerce poverty alleviation in colleges and universities.
Mid-term results of impaction bone grafting in tibial bone defects in complex primary knee arthroplasty for severe varus deformity
Authors: Tanwar Yashwant Singh , Kharbanda Yatinder , Bhargava Harsh , Attri Kulbhushan , Bandil Anoop
Published: January 2019

Introduction: Bone defects are a challenging problem encountered occasionally during primary knee arthroplasty. These defects should be meticulously addressed so as to avoid malalignment and premature loosening and failure. Out of the many options available to deal with these defects, impaction bone grafting provides a more biological solution, which is especially important in case of primary knees.

Materials and methods: A retrospective analysis was done and patients with severe varus deformity of more than 20 degrees who had undergone primary knee arthroplasty with impaction bone grafting of the tibial condyle defect were followed up.

Results: Between 2008 and 2014, out of the 1124 patients who underwent primary total knee arthroplasty, only 26 knees in 23 patients met the inclusion criteria. The amount of varus deformity ranged from 20 to 35 degrees. Follow-up ranged from 3 to 8 years with an average of 6 years. The average pre-operative Knee Society Score (KSS) and Western Ontario McMaster Universities (WOMAC) score were 24.2 and 78, respectively. There were significant improvements in the post-op scores, with the average KSS being 90.2 and the WOMAC being 38.

Conclusion: Impaction bone grafting provides an invaluable option to the orthopedic surgeon for managing bone defects, especially in case of primary knee arthroplasty as it reconstitutes the bone stock.
Study on foamy oil development effect in horizontal wells based on a novel inflow performance relationship model and a five-component model
Authors: Xue Yongchao , Du Mengge , Li Xingmin , Yang Yanwei , Shen Yang , Cao Meng
Published: January 2019

In this paper, a novel inflow performance relationship (IPR) model and a five-component simulation model are presented for the evaluation of the foamy oil development effect in horizontal wells. First, considering the production characteristics of foamy oil including single-phase flow, foamy oil phase flow, and two-phase flow, a novel IPR model is proposed for predicting the primary production of foamy oil. Then, the five-component model is proposed to simulate the development of foamy oil. Finally, sensitivity analysis and evaluation of the development effect are conducted. The results show that (1) the novel IPR model is in good agreement with the field data, which can be used for predicting the primary production of foamy oil. (2) The five-component model is better than the four component model for simulating the foamy oil. (3) Permeability and reservoir thickness play a key role in the recovery rate of foamy oil. (4) The recovery rate of single-phase flow, foamy oil stage, and two-phase flow stage is 1.69%, 4.59%, and 4.12%, respectively. This paper provides the engineers a novel insight into the production of foamy oil in horizontal wells and also provides an optimization method of productivity evaluation for the oil field.
Dynamics of a polymer under multi-gradient fields
Authors: Singh Sadhana , Kumar Sanjay
Published: January 2019

Effects of multi-gradient fields on the transport of a polymer chain are investigated using Langevin dynamics simulations. We observe that the natural frequency of tumbling follows Wi0.66 scaling, where Wi is the Weissenberg number. The distribution of angular tumbling time has exponentially decaying tails, and at high Wi, it deviates from Poisson behavior. Competition between the velocity gradient, which results in a shear flow in the system, and the solvent quality gradient arising due to the interaction among monomers reveals that there is another scaling associated with the angular tumbling time distribution. Moreover, at low temperature, we observe unusual behavior that at intermediate shear rates, the decay rate ν decreases with Wi.
Rheological investigation of gels formed by competing interactions: A numerical study
Authors: Ruiz-Franco José , Gnan Nicoletta , Zaccarelli Emanuela
Published: January 2019

A transition from solid-like to liquid-like behavior occurs when colloidal gels are subjected to a prolonged exposure to a steady shear. This phenomenon, which is characterized by a yielding point, is found to be strongly dependent on the packing fraction. However, it is not yet known how the effective inter-particle potential affects this transition. To this aim, we present a numerical investigation of the rheology of equilibrium gels in which a short-range depletion is complemented by a long-range electrostatic interaction. We observe a single yielding event in the stress-strain curve, occurring at a fixed strain. The stress overshoot is found to follow a power-law dependence on the Péclet number, with an exponent larger than that found in depletion gels, suggesting that its value may depend systematically on the underlying colloid-colloid interactions. We also establish a mapping between equilibrium states and steady states under shear, which allows us to identify the structural modifications induced by the presence of the shear. Remarkably, we find that steady states corresponding to the same Péclet number, obtained by different combinations of shear rate and solvent viscosity, show identical structural and rheological properties. Our results highlight the importance of understanding the coupling between colloidal interactions, solvent effects, and flow to be able to describe the microscopic organization of colloidal particles under shear.
Time-dependent characteristics of secondary electron emission
Authors: Li C. , Mao S. F. , Ding Z. J.
Published: January 2019

The recent development of the time-resolving capability for scanning electron microscopy (SEM) enables it to be a real 4D space-time imaging technique, which is extremely suitable for investigating the ultrafast dynamic processes concerned with secondary electron emission (SEE). This paper attempts to investigate the dynamic SEE process with the aid of a Monte Carlo method; the understanding of the mechanism will surely benefit the construction and application of various kinds of time-resolved SEMs. Our simulation modeling is based on the use of the Mott cross section and a dielectric function approach for the respective description of the electron elastic and inelastic scattering. One secondary electron is assumed to be produced in an inelastic scattering event, and the owned kinetic energy enables it to transport and produce other secondary electrons, forming the cascade production process. From the simulation, not only the time delay of SEE from the incidence instant of primary electrons but also the time dependences of the involved physical quantities, including the energy-, depth-, direction-, emission site-, and production site-distributions can be theoretically derived. The calculations provide useful knowledge on the time dependence of SEE from the theoretical perspective for the applications to the available time-resolved SEMs.
Highly methylated Xist in SCNT embryos was retained in deceased cloned female goats
Authors: Deng Mingtian , Liu Zifei , Ren Caifang , An Shiyu , Wan Yongjie , Wang Feng
Published: January 2019

X (inactive)-specific transcript (Xist) is crucial in murine cloned embryo development, but its role in cloned goats remains unknown. Therefore, in this study we examined the expression and methylation status of Xist in somatic cell nuclear transfer (SCNT) embryos, as well as in ear, lung, and brain tissue of deceased cloned goats. First, the Xist sequence was amplified and a differentially methylated region was identified in oocytes and spermatozoa. Xist methylation levels were greater in SCNT- than intracytoplasmic sperm injection-generated female 8-cell embryos. In addition, compared with naturally bred controls, Xist methylation levels were significantly increased in the ear, lung, and brain tissue of 3-day-old female deceased cloned goats, but were unchanged in the ear tissue of female live cloned goats and in the lung and brain of male deceased cloned goats. Xist expression was significantly increased in the ear tissue of female live cloned goats, but decreased in the lung and brain of female deceased cloned goats. In conclusion, hypermethylation of Xist may have resulted from incomplete reprogramming and may be retained in 3-day-old female deceased cloned goats, subsequently leading to dysregulation of Xist.