bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Approach to Finding a Risk-Informed Safety Factor for “Fail-Safe” Pressure Vessel and Piping Design
Authors: Fong Jeffrey T. , Heckert N. Alan , Filliben James J. , Marcal Pedro V. , Freiman Stephen W.
Published: April 2015

The purpose of this paper is to present a new approach to finding a risk-informed safety factor for the “fail-safe” design of a high-consequence engineering system. The new approach is based on the assumption of a 99.99 % confidence level and a 99.99 % coverage, and the application of the classical theory of tolerance limits, error propagation, and a method of statistical model parameter estimation known as the bootstrap method. To illustrate this new approach, we first apply the methodology to theUTSdata of six materials ranging from glass, ceramics, to a high-strength steel at both 20 C and 600 C, and then to the fatigue life estimation of a BK-7 glass using two available additional sets of laboratory test data. Significance and limitations of our new approach to the “fail-safe”UTSdesign and fatigue life prediction of an aging PVP or aircraft are presented and discussed.
Why and how Did a Multi-Layered Vessel Explode?
Authors: Wang Wei Qiang
Published: April 2015

The layered cylindrical shell is one of important structures of high pressure vessels. From 1977 to 2005 there were 8 urea synthesis reactors exploded. Seven of them were layered cylindrical shell structure. Therefore, there will be much more issues come out and waiting for us to study and explore. In this paper, we take the urea synthesis reactor exploded in 2005 in China as an example to study why and how a multi-layered exploded. Through the research work, we not only concluded why and how a multilayered vessel exploded but also established a method to analyze the serious explosion accident of complex vessels such as urea synthesis reactors.
Numerical Prediction of Creep Crack Growth Rate in Cr-Mo-V Steel for Specimens with Different Constraints
Authors: Zhang Jing Wei , Wang Guo Zhen , Xuan Fu Zhen , Tu Shan Tung
Published: April 2015

The creep crack growth rate in Cr-Mo-V steel has been numerically predicted for specimens with different constraints for a wide range ofC*by using stress dependent creep model and ductility, and the simulatedda/dt-C*curves were compared and analyzed with experimental data. The results show that the simulatedda/dt-C*curves agree well with experimental data. At low and transitionC*regions, the crack-tip constraint has obvious effect on CCG rates, while at highC*region it almost has no effect. With increasing constraint, the CCG rates and transition region size onda/dt-C*curves increase due to higher stress traxiality ahead of crack tip and stress-regime dependent creep ductility. If the extrapolation CCG rate data of standard high constraint CT specimen from highC*region (above the turning point 2) or from transitionC*region are used in life assessments of the components with various constraints at lowC*region (below the turning point 1), the non-conservative or excessive conservative results may be produced. Therefore, the CCG rate data for considering constraint effect should be obtained for a wide range ofC*by long-term laboratory tests or numerical predictions using the stress dependent creep model and ductility.
Effect of Carbon Black Reinforcing Fillers on Mechanical Properties of NBR Materials Used for the Progressing Cavity Pump
Authors: Pan Long , Tan Jin Zhu , Fan Liu Fei , Han Xue Mei
Published: April 2015

Three kinds of reinforcing fillers (i.e. carbon black N330, carbon black N880 and carbon-white) were used to study effect of the reinforcing fillers on the mechanical properties of NBR materials. The NBR materials with various reinforcing fillers were fabricated, and the mechanical property tests were performed in this work. The results show that the carbon black N330 made the NBR material have better tensile strength, hardness, elongation and compression elastic modulus compared to the carbon black N880 and the carbon-white, while the carbon-white made NBR material have better heat resistance, tear strength and elongation compared to the carbon black N330 and the carbon black N880. In addition, the tensile strength, tear strength, elongation and the heat resistance property of the NBR materials increased significantly with the increase of the carbon-white, but the compression elastic modulus decreased with the increase of the carbon-white.
Trans-Scale Analysis Approach of Fatigue Crack Behavior for Aluminum Alloy LC4 Plate
Authors: Wei Tian Tian , Tang Xue Song
Published: April 2015

Material damage state is described by a restraining stress zone. Then, a macro/micro trans- scale fatigue crack growth model is established. The proposed model is used to simulate the whole fatigue process from a micro-defect to the final macroscopic fracture. Numerical calculations are performed. The fatigue test data for the LC4 aluminum alloy plate specimens are accurately re-produced by the present model. Furthermore, when the microscopic effects are taken into account, the scatter feature of the fatigue test data can also be reflected.
Using Indentation Test to Evaluate the Properties of Metallic Material with Strain Aging
Authors: Tang Jie , Cheng Mao , Huang Guo Gen , Shu Hong , Xu Hui Ting
Published: April 2015

In this paper, research on a testing method of indentation test proposed by F M Haggag is discussed first, and the experimental testing research on metallic material properties with strain aging is carried out and discussed using indentation test. The authors proposed to use indentation test to measure the properties of metallic materials with strain aging embrittlement based on experimental verification. And it provides a possibility to measure the properties of metallic materials with strain aging using nondestructive testing method.
Analysis of Vibration Testing for the Structure with Bolted Flange Joints
Authors: Liu Ming Ming , Zhai Qing Gang , Shi Hong
Published: April 2015

The test was simulated for the thin-walled cylinder structure of aeroengine stator casing. Based on the software of LMS-TEST, the experiment of the structure with bolted flange joints was successfully completed for the vibration test analysis and the paper completed the testing under different pre-tightening force. Through the analysis of the measured data, the corresponding spectrum and difference value curve were obtained, the research results showed that the nonlinear characteristics of the bolted flange joint was significant influence on the dynamic responses of the structure, the various nonlinear vibration phenomenon and the signal asymmetry were obvious under different pre-tightening force, which was closely related to the state of the bolted pre-tightening force. By the information of the spectrum and acceleration difference curve, the extent of the bolt tightness can be determined, which can provide relevant reference information for the diagnosis of bolted joint status in the aeroengine stator casing.
Characteristics and Properties of Reinforced Oil Palm Frond Fibers (OPFF) in Polyvinyl Alcohol (PVA) Composite for Tubular-Shaped Trays
Authors: Sukudom Nawapon , Jarupan Lerpong
Published: April 2015

Effects on characteristics and mechanical properties of oil palm frond fiber (OPFF) as a reinforced element in poly vinyl alcohol (PVA) were investigated in this study. Series of different loading of OPFF were prepared by the following compositions: 5, 10, 15, 20 and 25 part per resin (phr). Glycerol at 35 phr was also compounded using twin-screw extruder to decrease degree of crystallinity and to reduce shear force of PVA to improve the processability. Injection molding was used to produce specimen for testing. The results indicated that the OPFF has an impact on mechanical properties of the composite material. Different scanning calorimeter (DSC) showed that the melting temperature (Tm) of OPFF reinforced PVA blended with glycerol was shifted to having decrease when compared to the pure PVA. Different loading contents of OPFF indicated that the compressive strength and morphological properties performed by a similar fashion. A highest compressive strength and the modulus of OPFF-reinforced PVA at 25 phr were achieved. Scanning electron microscope (SEM) indicated that OPFF-reinforced PVA at 25 phr yielded no accumulation of OPFF fibers but showed the dispersion in the matrix phase. In conclusion, the OPFF derived from oil palm industry can be used as reinforcement for manufacturing of plant pot in the future stage
3D Unsteady Convection-Diffusion-Reaction via GFEM Solver
Authors: Claro Romão Estaner , de Moura Luiz Felipe Mendes
Published: April 2015

In this paper, an important study on the application of the α family of temporal discretization is presented. For spatial discretization the Galerkin Method (GFEM) was used. With the variation of the α coefficient in temporal discretization and through one numerical applications with exact solution, it will be possible to have an initial idea on how each one of the two suggested methods behaves. It is expected that this study can be able to advance several other studies within the domain of numerical simulation of physical problems. It is important to note that for all applications we will use a mesh that is considered gross, with the purpose of presenting a method that is robust, precise and mainly computationally economic.
An Improving Method for Background Correction in Laser Induced Breakdown Spectroscopy
Authors: Zhang Bo , Sun Lan Xiang , Yu Hai Bin
Published: April 2015

Background correction is an essential part in LIBS signal analysis. The interpolation method of background correction has major drawbacks. This paper introduces an interpolation method to overcome the shortcomings of linear and cubic spline interpolation methods. Finally, we compare different interpolation methods to verify the proposed interpolation method.
Low Cost Mobile Robot Kits Design as a Teaching Tool for Education and Research
Authors: Chomyim Chiraphorn , Chaisanit Settachai , Trangansri Apichai
Published: April 2015

Robot technology is important for students to be able to work in 21st century and to share technical knowhow. Learning robot technology is very difficult because the high costs of hardware equipment; it was used mainly in the hi-tech subject’s area such as military affairs, space, medicine, engineering, etc. With the improvements and developments of technology, Robot technology is now open for the general public’s use. In basic education, it is also more and more popular to use robot when teaching science, physics, technology, etc. Unfortunately, the robot equipment also still high costs. This project concentrates on the design and develops a low cost mobile robot kits as a teaching tool for education and research. In this project we developed a tool that will help students to understand technology based on mobile robotics technology and electronic engineering. The robot kit in this project was designed to create modular systems, considering assembly requirements of different types of objects as well as various user activities. Each module of the robot kit takes care of a core function required to operate automata. The modules help students build kinetic sculptures quickly and easily, eliminating the need for unsafe tasks such as soldering. Further, the features of this robot kit can be expanded to allow integration with programming modular and multimedia programming environment, making it possible to develop more creative automata for improve education and research forward.
Reliability of Identification Based on Fingerprints in Dual Biometric Identification Systems
Authors: Nídlová Veronika , Hart Jan
Published: April 2015

At present, the development of biometrics is a widely discussed topic. This research discusses the reliability of the most used category - identification using fingerprints. There are many of these types of systems. The most affordable, and therefore the most common alternative is one that identifies users using an optical sensor. Testing was conducted on two scanners only for fingerprints, and on two systems that recognize users via their fingerprints and also through a facial image. The conclusions from the measurements were that reliability was mainly affected by the characteristics of the scanners, in particular whether the scanner identifies only based on the fingerprint, or in combination with another biometric method. Due to the fact that with combined systems manufacturers focus only on one identification circuit – usually the most modern - and not the potentially safest, i.e. a fingerprint, the results show that it is much easier to sabotage dual biometric identification devices than those that identify solely on the basis of a fingerprint. Reliability values ​​greatly exceed the values specified by the manufacturer. The measurements show that there is a need to continuously improve dual biometric identification systems.
An Outage of Overhead and Underground Distribution Network Evaluation Assessment
Authors: Okorie Patrick U.
Published: April 2015

Frequent and major power interruptions cause many concerns. Assessment of customer power supply reliability is an important part of distribution operation and planning. Many factors are responsible in the reliability of power network; design, construction, operation and maintenance which have their combined effect to overall performance of power network reliability. Analysis of outage data from both OH and UG distribution system of Abuja network is carried out assess their reliability indices. Predictive assessment of distribution reliability indices can be used to identify areas that have poor reliability so that appropriate approach can be taken in the system design and implementation. This paper presents assessment of reliability indices in a practical radial distribution network particularly with the interest of comparison the reliability of OH and UG distribution system. UG is more reliable than OH but takes longer duration in fault restoration.
Research and Establishment of UHV AC Transmission Model
Authors: Yang Hao , Tang Fei
Published: April 2015

There is different applicable transmission capacity and range between 1000kV and 500kV AC transmission. The traditional method is to use the continuous power flow algorithm by BPA simulation software. But this method is complicated and time-consuming. Calculation is particularly large when electricity has a variety of power demand analysis. This paper presents an algorithm based on the AC line transmission capacity, using MATLAB software programming to achieve the establishment of UHV AC transmission model and economical optimization strategy. The method can use thermal limit, voltage limit, landing stability constraints to get the AC line transmission capacity curve by considering the factor of power network strength. On the basis of this method, an UHV AC transmission model can be built combining with unit capacity annual cost algorithm, which can meet the power transmission of arbitrary transmission capacity and the optimal economic of any transmission distance, has an important reference significance and practical value for the planning and construction of electric transmission lines in China.
Performance Verification of Power Quality Signals Classification System
Authors: Abdullah Abdul Rahim , Abidullah N.A. , Shamsudin N.H. , Ahmad N.H.H. , Jopri M.H.
Published: April 2015

Power quality has become a greater concern nowadays. The increasing number of power electronics equipment contributes to the poor quality of electrical power supply. The power quality signals will affect manufacturing process, malfunction of equipment and economic losses. This paper presents the verification analysis of power quality signals classification system. The developed system is based on linear time-frequency distribution (TFD) which is spectrogram that represents the signals jointly in time-frequency representation (TFR). The TFD is very appropriate to analyze power quality signals that have magnitude and frequency variations. Parameters of the signal such as root mean square (RMS) and fundamental RMS, total waveform distortion (TWD), total harmonic distortion (THD) and total non-harmonic distortion (TnHD) of voltage signal are estimated from the TFR to identify the characteristics of the signal. Then, the signal characteristics are used as input for signal classifier to classify power quality signals. In addition, standard power line measurements are also calculated from voltage and current such as RMS and fundamental RMS voltage and current, real power, apparent power, reactive power, frequency and power factor. The power quality signals focused are swell, sag, interruption, harmonic, interharmonic, and transient based on IEEE Std. 1159-2009. The power quality analysis has been tested using a set of data and the results show that, the spectrogram gives high accuracy measurement of signal characteristics. However, the system offers lower accuracy compare to simulation due to the limitation of the system.
The Designing of Data Acquisition Card through PIC18F4550 and an Interface Study
Authors: Terzioğlu Hakan , Herdem Saadetdin , Bal Güngör
Published: April 2015

Since automatic control is used in every field, there is almost no industrial application system which doesn’t employ the sensors. It makes correctly reading the data obtained from sensors in the system with sensors and transmitting this data into the computer more important. In this executed study, a design for an interface which can be easily used with a low cost data processing card and with flexible structure was performed. In the executed system, the PIC18F4550 microcontroller was used and data can be accurately read from 10 different channels. The data read from the designed data acquisition card was transferred into a computer interface program prepared in C# program using a USB and recorded into the database in the Microsoft Access program. The designed interface, the values of read signals and their graphs may be displayed on the screen. Thus, the interface screen may be used as both an indicator and oscilloscope screen.
Analyse of Agricultural Soil Heavy Metals Pollution
Authors: Kralikova Ruzena , Andrejiová Miriam
Published: April 2015

Soil represents a decisive natural resource and economic and eco-social potential of the every country. Soil pollution is one of the biggest environmental problems. Contamination in the soil environment has a significant impact on the use of land resources and can cause high levels of exposure for people living near the site of contamination. Therefore, the risk elements soil pollution assessment is one of the most important resources for comprehensive evaluation of contaminated areas.The paper investigates the degree of heavy metal contamination of agricultural soil in selected Slovakian districts over a monitored period of time. Selected multidimensional statistical methods were applied to analyse and evaluate the degree of soil contamination.
Project Acquaponia - Designing Sustainable Equipment for Treating Gray School Waters for Irrigation and Food Growing
Authors: Uribe Ricardo Victoria , León Ricardo Victoria , Ortega Arturo Santamaría , Rubio Toledo Miguel Ángel
Published: April 2015

The objective of this paper is to present a brief report of a project for water recycling and treatment for a second use applied at the Academic Unit of Amecameca, part of the Autonomous University of the State of Mexico (UAEMex). It presents the local problems that gave origin to the project as well as the development and structure of the system developed for such project. Finally it presents the lessons learned from its development as well as further venues of research for new developments and improvements. It is the researchers' consideration that this project can represent a viable option for sustainable use of residual water in remote locations.
Analysis on Current State on Safety Education of Korean Construction Sites in Overseas
Authors: Shin Yoon Seok , Kim Gwang Hee
Published: April 2015

Heinrich (1980) claimed that safety education primarily relates with 88 percent of safety accidents, and secondarily relates with safety accidents. For this reason, safety education is of critical importance. However, while many studies have been performed on safety education in Korea for the prevention of safety accidents, few studies have been done on safety education currently performed in other countries. Therefore, in this study, a comparative analysis was conducted on the safety education cases of three different construction companies that are currently carrying out overseas construction projects. With this study, we identified four shared features and some differences in the safety education of each company.
Study on Spending for Safety Management Cost in Korean Construction Sites
Authors: Shin Yoon Seok , Kim Gwang Hee
Published: April 2015

While safety in the construction industry has been acknowledged as an important issue, there has yet to be a decrease in the number of disasters. For this reason, to manage and control construction disasters, a study should be conducted on the distribution and use of money allocated to safety management at construction sites. Thus, through an analysis of the current state of safety management cost, a distribution plan was sought, by accident type. In this study, the current state of accidents and safety management cost of four construction sites were analyzed. In the findings of this study, it was found that crash accidents, which have been reported as the accident type most frequently occurring, can be cut by increasing the safety facility cost for the prevention of crashes by more than 50 percent
Modeling Design of Plastic Bottles Based on Laser Scanner and Rapid Prototyping Technology
Authors: Ni Hong Jun , Chen Qing Qing , Chen Lei , Huang Ming Yu , Wang Xing Xing
Published: April 2015

Accurate surface modeling of washing liquid bottle is to get through RP technology. Point cloud data of washing liquid bottle is obtained by hand-held laser scanner and processed by Imageware software, 3D model is got by Pro/E. Rapid prototyping machine is used to print solid model. High precision model built by ABS is easily got without complex processes.
Performance Evaluation of Real Power Quality Disturbances Analysis Using S-Transform
Authors: Rahim Abdullah Abdul , Ahmad Nur Hafizah Tul Huda , Abidullah N.A. , Shamsudin N.H. , Jopri M.H.
Published: April 2015

Power quality is main issue because of the impact to electricity suppliers, equipments, manufacturers and user.To solve the power quality problem, an analysis of power quality disturbances is required to identify and rectify any failures on power system. Most of researchers apply fourier transform in power quality analysis, however the ability of fourier transform is limited to spectral information extraction that can be applied on stationary disturbances. Thus, time-frequency analysis is introduced for analyzing the power quality distubances because of the limitation of fourier transform. This paper presents the analysis of real power quality disturbances using S-transform. This time-frequency distribution (TFD) is presented to analyze power quality disturbances in time-frequency representation (TFR). From the TFR, parameters of the disturbances such as instantaneous of root mean square (RMS), fundamental RMS, total harmonic distortion (THD), total nonharmonic distortion (TnHD) and total waveform distortion (TWD) of the disturbances are estimated. The experimental of three phase voltage inverter and starting motor are conducted in laboratory to record the real power quality disturbances. The disturbances are recorded via data logger system which is mplemented using LabVIEW while the analysis is done using Matlab in offline condition. The results show that S-transform gives good performance in identifying, detecting and analyzing the real power quality disturbances, effectively.
Data Preprocessor for Order Preserving Encryption
Authors: Jo Suhyung , Lee Sang Su , Choi Doo Ho
Published: April 2015

Sensitive data such as personal telephone number, address, social security number at database is prevented to access by SQL search query. In order to prevent security problems it needs to encrypt database. Order preserving encryption (OPE) is a method of encrypting data so that it's possible to make efficient inequality comparisons on the encrypted items without decrypting them. OPE data of database is available to make index without decryption. In this paper, the data preprocessor by reducing plaintext range, the performance of OPE is increased and sensitive data are protected at database.
The Combination Method for the Service Parameters of Product-Service Systems
Authors: Zhang Fei , Xu Yang
Published: April 2015

To realize the optimum parameters combination of product-service systems, a method based on the customer demands was referred. Firstly the customer demands and characteristic were divided into three types. Secondly using the combination of quantitative and qualitative method, the model of different customer satisfaction function to meet the various demands was established through data fitting. Finally more accurate and reasonable parameter combination model was achieved by building the optimal design model to meet the customer demands. Taken the grader company as an example, the validity of this method was proved.
Characterization of Multiple Functional Solid Line of Graphite Ink Surface Printed by Micro-Flexographic
Authors: Maksud M.I. , Yusof Mohd Sallehuddin , Embong Zaidi
Published: April 2015

The purpose of this paper is to study a ink surface morphology, quantify the chemical composition involved in processing of graphite ink printed by flexographic printing. The methodology is to use surface sensitive technique, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) and Field Emission Scanning Electron Microscopy (FESEM). As a finding we successfully achieved 25 micron lines array using PDMS printing plate. The Originality and value of this work is surface sensitive techniques like XPS, AFM and FESEM were exclusively used in order to characterize graphite inks printed by flexographic method, using PDMS printing plate.
Design and Rapid Prototyping of S-Shape Push-Ups Frame Based on Laser Scanning
Authors: Ni Hong Jun , Chen Qing Qing , Pei Yi , Lv Yi , Wang Xing Xing
Published: April 2015

Model design and rapid prototyping are utilized to manufacture push-ups frame. Point cloud data can be obtained by scanning parts with hand-held laser scanner, and imported into the Imageware to process. The varied points are removed, the missing points are repaired, and then the 3D model is designed through the Pro/E. Finally, the frame model is completed by rapid prototyping printers. The manufacturing period is shorten through the way of putting two technologies in the field of manufacturing together, the production requirements are met, and the business efficiency is improved.
Formulation of Nanofiltration Flat Sheet Membrane Using Cellulose from Kenaf Core
Authors: Abdullah Sharifah , Abdullah Nor Munirah , Mohd Tajuddin Ramlah
Published: April 2015

This study was conducted in order to determine the suitable formula in developing a nanofiltration membrane using additive from kenaf core. Kenaf core was processed and analyse the suitable component to be used as the additive in formulation the nanofiltration membrane. Kenaf taken from National Kenaf and Tobacco Board (NKTB) Malaysia with code reference of V36 was used in this study. Cellulose of Kenaf core was extracted using Microcrystalline Cellulose (MCC) process at the Forestry Research Institute of Malaysia (FRIM). From few percentage of Kenaf cellulose with analyses using Flux Purewater Test, NaCl Test (Rejection Test), Molecular Weight Cut Off (MWCO) Test, Scanning Electron Microscopy (SEM) and Fourier Transform Infra Red (FTIR), the suitable percentage of Kenaf cellulose for nanofiltration flat sheet membrane was obtained.
Application of Neural Networks in Perishable Inventories Management
Authors: Assawawongmethee Wichittra , Laosiritaworn Wimalin
Published: April 2015

Classifying inventories into different groups based on the importance of each category of material is necessary for inventory management when there are a large number of inventories to be managed. In order to plan and determine effective policies in the management of each material, it is essential that the inventories be properly classified. One of the most popular methods used in classifying inventories is the ABC analysis, which is the classification of inventories based on their actual values. In the food-processing industry, for example, where inventories are often of perishable goods, the quality of inventories will decrease with storage time. Storage time is therefore considered a major factor when managing this inventory. In this research, the criterion of storage time was considered alongside others, including prices of materials per unit, amount of use, worth of use, and duration. However, since the classification of the inventories in this study was based on various complicated criteria, neural networks were applied. By using previous classifications as the input variables, we were able to apply a neural network to produce output variables and classify each inventory category into group A, B, or C. Neural networks were used to manage 105 inventories of the processing and product developing plant of the Royal Project Foundation. The findings showed that the neural network could effectively classify those inventories into groups A, B, and C, and that the accuracy of this classification was 84.35%.
Analysis of Research Trends in Water Resource Management Using Network Analysis
Authors: Jeong Dae Hyun , Koo Young Duk
Published: April 2015

This study was conducted to investigate the research trends in water resource management using authors' keywords of papers in this area. For this purpose, networks of keywords were constructed through the analysis of social networks and the degree centrality was used as a measure for analyzing the water resource management areas in which research is being conducted most actively. Based on this analysis, the research trends in water resource management during the 1990s, 2000s, and after 2010 were investigated. As a result, the most active research areas in water resource management were found to be integrated water resource management system, water policies, and the development of programs for optimizing water resources. As a result of the analysis by period, the central subjects of research that emerged as new trends were found to be the acquisition of water resources such as ground water development during the 1990s, water resource management during the 2000s, and water resource management measures and government policies to cope with climate change after 2010. The significance of the present study is that the research trends were examined around the correlations among keywords by using social network analysis, rather than analyzing research trends simply by using the frequencies of papers and citations in water resource-related papers.
Synthesis of Superhard Coatings Using Pulsed Beams of High-Energy Gas Molecules
Authors: Grigoriev Sergey Nikolaevich , Seleznev Anton Evgenievich
Published: April 2015

It is proposed to use for synthesis of superhard and fracture tough nanocomposite coatings on dielectric products with deep cavities a source of metal atoms accompanied by pulsed beams of high-energy neutral gas molecules. Slow and fast particles are produced by one and the same plasma emitter of ions and trajectories of their movement from a common emissive grid to the product surface coincide.
Investigation of Optimal Silk Film Thickness in Silk Microneedle Fabrication
Authors: Jiruedee S. , Luangweera W. , Sookyu B. , Patoomvasna K. , Pimpin A. , Rattanasumawong C. , Palaga T. , Damrongsakkul Siriporn , Srituravanich W.
Published: April 2015

Injection is one of the most commonly used methods for delivering drugs or vaccines into human bodies. It is rapid, low-cost and compatible with almost any drugs. However, the major drawbacks of the injection by hypodermic needles are the pain associated with the injection and the disposal of used needles. Microneedles have then received wide attention since they can overcome such drawbacks, especially dissolving microneedles. Recently, silk fibroin has been used to fabricate dissolving silk microneedles for transdermal drug delivery at low temperature. In the fabrication process, the quality of the silk microneedles relies on the solidification of silk fibroin solution. This research aims to study the role of silk fibroin concentration (silk film thickness) in the formation of silk microneedles. In the experiment, silk microneedles were fabricated using various concentrations of silk fibroin solution from 3 to 7% while the volume of the silk fibroin solution was fixed. According to the experimental resuls, it was found that the concentrations of 4-5% were suitable for producing silk microneedles (silk film thickness of 470 μm) while the concentrations of 6-7% caused wrinkles on microneedle patch due to mismatch of upper and lower layers of microneedles. Furthermore, the concentration of 3% had a problem with the demolding step of microneedles since it caused mold damage due to strong adhesion force between microneedles and mold.
Microstructural Stability and Creep Behavior of Directionally Solidified MgAl2O4/Y3Al5O12 Eutectic Composite
Authors: Abali Serkan
Published: April 2015

In the present work, compressive creep characteristics of directionally solidified MAS-YAG (MgAl2O4/Y3Al5O12) were investigated at high temperature. The compressive creep strength of a crystal grown at a rate of 5 mm/min and a flow rate of 1.2 mm/min at 1500 °C under a strain rate of 1.0 × 10-4 was only 400 MPa, which is slightly higher than that of crystals grown under different conditions. The compressive creep strength of an oxide eutectic fabricated by the directional solidification method is higher than that of a polycrystalline sintered eutectic with the same composition. The creep behavior at high temperature was studied and the mechanisms of deformation by dislocation motion were revealed by Transmission Electron Microscopy (TEM) observations.
Complex Formation of Polyacrylic Acid with Surfactants of Different Hydrophobicity
Authors: Tazhibayeva Sagdat , Musabekov Kuanyshbek , Kusainova Zhenis , Sapieva Ardak , Musabekov Nurlan
Published: April 2015

Complex formation processes of polyelectrolytes with surfactant ions are close model to protein - lipid interactions in living organisms. Furthermore, polymer – surfactant complexes are widely used as stabilizers of industrial dispersions and structurants of soil. When using the polymer-surfactant complexes the hydrophilic-lipophilic balance has the great importance. The interaction of polyacrylic acid with alkylammonium salts of different hydrophobicity: cetyltrimethylammonium bromide, dilaurildimethylammonium bromide and dioctadecyldimethylammonium chloride was studied by potentiometry, spectrophotometry, viscometry and electrophoresis methods. It was established that the complex formation of polyacrylic acid with cationic surfactants is carried out due to the electrostatic interaction between carboxyl groups of the polymer and cations of surfactants, which stabilized by hydrophobic interactions between their non-polar parts. The phenomenon of hysteresis in the change of the reduced viscosity of system surfactant /polyacrylic acid with temperature variation in the range of 20-60 °C was found. The possibility of using the complex formation process for water purification from CTAB has been shown. The degree of purification is 99.6-99.8%.
Luminescence and Morphology Control of Phosphor Materials Synthesized by Melt Synthesis Method
Authors: Toda Kenji , Ishigaki Tadashi , Kamei Shinnosuke , Kim Sun Woog , Uematsu Kazuyoshi , Sato Mineo , Yoshimura Masahiro
Published: April 2015

Efficient and well-grown SrAl2O4:Eu,Dy phosphors were synthesized by an innovative melt synthesis method. The luminescent intensity and after-grow intensity of the SrAl2O4:Eu,Dy phosphors synthesized by the melt synthesis method are comparable to those of the sample synthesized by a conventional solid state reaction. Sintered phosphor balls with excellent luminescent characteristics were obtained.
Magnetic Condition Flat Core/Shell Nanoparticles
Authors: Afremov Leonid , Elovskii Artur
Published: April 2015

In terms two-phase nanoparticles model, dependence equilibrium position of magnetic moments of parameters size and elongation nanoparticles core is investigated. Phase diagrams of magnetic states were shown and determine geometrical parameters core, in equilibrium states.
“Average Spin” Approximation in the Heisenberg Model
Authors: Afremov Leonid L. , Petrov Aleksandr A.
Published: April 2015

The “average spin” method was developed in terms of Heisenberg model. The average magnetic moment’s depending average of the temperature, the number of the nearest neighbors and spin of the atom has been calculated. It’s shown that the Curie temperature decreases with the spin of the atom.
Designing of Details Taking into Account Degradation of Structural Ceramics at Exploitation
Authors: Kuzin Valery V. , Grigoriev S.N. , Volosova Marina , Fedorov Mike
Published: April 2015

Composite character of ceramics is a base for creating new generation materials. It is established that the rational choice of the basic structural elements allows to control stress-strain state of the "loaded" ceramics and to slow down process of its degradation. The developed method of designing of details taking into account ceramics degradation at exploitation is described.
Structural and Optical Analysis of Eu3+ Doped BiVO4 Nanophosphor by Combustion Method
Authors: Yadav R.S. , Dwivedi Y. , Rai S.B.
Published: April 2015

Present article report synthesis and spectroscopic analysis of BiVO4 nanophosphor doped with trivalent Eu ions. It was observed that BiVO4 nanocrystals shows higher yield in comparison with the as-made nanocrystals on 266 nm laser excitation. On 266 nm excitation, emission composed of red dominated wide spectrum in the range of 400-950 nm was reported. Emission intensity enhanced five times on annealed sample than the counterpart. Time resolved analysis explores significant alteration in excited state relaxation process due to annealing. Detailed photo physics involved to improve optical emissions has also been explained.
Experimental Characterization of Multiaxial Glass Laminates for Front End Cab
Authors: Fojtl Ladislav , Rusnáková Soňa , Žaludek Milan , Rusnák Vladimír
Published: April 2015

This research paper deals with an experimental investigation of mechanical properties of prepared composite panels. Flexural behavior in three-point bending test is measured. Composites are prepared in order to satisfy requirements for transport industry. Totally, three material compositions are tested with different multiaxial reinforcing fabric and polyester resin. All samples are produced by low-pressure vacuum infusion mainly used for large-scale composite parts. Furthermore, fire resistance of prepared laminates is tested and appropriate classification into corresponding categories is also done. Experimental results proved suitability of prepared glass fiber composites for application in transport industry.
Material Properties of PA6/rPA6x Blend
Authors: Navratil Jan , Manas Miroslav , Stanek Michal , Manas David , Bednarik Martin , Mizera Ales
Published: April 2015

This research paper suggests a possible solution for a growing problem of irradiated materials ́ waste processing. Recycled radiation crosslinked polyamide 6 (rPA6x) was used as a filler into non-modified polyamide 6 (PA6) in several concentrations. Influence of the amount of the filler on mechanical properties of resulting blends was investigated. Tensile test was carried out at two temperatures to determine mechanical behavior. Results show that there is a little difference at all observed material characteristics in comparison with non-modified PA6. According to the results it was proven that there is a possible utilization of such modified materials after the end of their service life but some other properties have to be examined.
Influence of Non-Newtonian Behavior Index on Curing Rate when Injection Molding
Authors: Stanek Michal , Kyas Kamil , Manas David , Manas Miroslav , Ovsik Martin , Senkerik Vojtech , Skrobak Adam
Published: April 2015

Right used computational analyses are commonly good tool for technical industry to improve process. This paper shows using computational analysis during injection molding process and shows using computational analysis to improve the injection molding process. The main aim of the paper is presenting differences between effects on non-Newtonian behavior on cure rate in final product in rubber process. It was found that for specific geometry and processing conditions, increase in the index of non-Newtonian behaviour increases the curing rate due to viscous dissipation taking place at the flow domain walls. It was shown for variable flow rate.
In Vitro Antimicrobial Properties of Propolis against Caries-Associated Microorganisms
Authors: Thaweboon Boonyanit , Thaweboon Sroisiri , Kaypetch Rattiporn , Muadcheingka Thaniya
Published: April 2015

Natural products have attracted much attention in recent years as a useful substance used in medicine and dental products. Propolis is a lipophilic resinous mixture collected from various plant sources by honeybees. It has been known for many biological activities including antimicrobial properties. Objective: To evaluate the in vitro antimicrobial activity of propolis against caries-associated microorganisms, Streptococcus mutans, Lactobacillus casei and Candida albicans. Materials and methods: The antimicrobial activity was initially screened using agar disc diffusion and then the minimum lethal concentrations (MLCs) were determined using broth dilution technique. Chlorhexidine (0.2%) and dimethyl sulfoxide (5%) were used as positive and negative controls, respectively. Results: Propolis exhibits the zones of inhibition ranged from 15 to 18 mm for S. mutans, and from 10 to 12 mm for L. casei, but presented no activity against C. albicans. The MLC against S. mutans was 2.86 mg/mL and those against L. casei were 11.44 mg/mL and 12.87 mg/mL. Conclusion: Propolis shows a potent antimicrobial effect against S. mutans and L. casei. This could provide a scientific basis to its application of usage in oral care products for the prevention of dental caries. However, further studies are necessary to evaluate other biological activities and molecular mechanisms of action as well as its cytotoxic effect.
Dependence of Relaxation Time on the Core Size Two-Phase Nanoparticles Magnetite/Titanomagnetite
Authors: Iliushin Ilia , Afremov Leonid Lazarevich , Anisimov Sergey
Published: April 2015

In this paper, depending of the blocking temperature on magnetite core size for core/shell nanoparticles has been carried out using our theoretical model. Nanoparticles has size of 100nm, and magnetite core increases from 0nm to 100nm. Systems were studied with different values of exchange constant. The data obtained indicate that exchange constant increases the blocking temperature. However, the sign of the constant does not matter.
The Study of Deep-Hole Drilling BTA Drill Whirl Caused by Cutting Fluid
Authors: Chen Zhen Ya , Dong Zhen , Huang Xiao Bin , Li Yan Lan
Published: April 2015

The relationships between drill speed, whirl, squeeze effect and fluid force drill suffered is got by using cutting fluid Reynolds equation. Principle of deep-hole drilling drill whirl is studied, pointing out the promotion of positive precession cutting fluid component is drill whirl’s reason. Simulated and studied of drill whirl round shape at different times, suggesting that only when BTA drill suffered by the fluid force, stable motion can be obtained. Analysis of the anti-precession of drill, and the squeeze film damper work principle is revealed. Comparative studied the movement of the drill by using MATLAB software simulation before and after adding squeeze film damper.
Failure Modes and Acceptance Criteria of Reinforced Prestressed Concrete Railway Sleepers Based on Dynamic Loading Tests
Authors: Karmazínová Marcela
Published: April 2015

The paper is focused on the problems of the dynamic behaviour, failure and resistance of reinforced prestressed concrete railway sleepers, developed and verified continuously in the period of several last years. The results of dynamic loading tests are presented for the sleepers for both wide and narrow track gauge. The test results have been evaluated using the criteria for the acceptance based on the load corresponding to the prescribed crack width and the load at the moment of total fracture.
Numerical Models of End-Plate Assembling Bolt Connection of Angle Profiles
Authors: Jurčíková Anežka , Pařenica Přemysl , Rosmanit Miroslav
Published: April 2015

The aim of this work was to create numerical models of the common truss-type assembling joints of L-profiles. Two different models were created – basic (simplified) model of joint and more accurate model which corresponds to the experimental specimens in preparation. Models with different end-plate thicknesses and consequently with different failure modes were solved. The results obtained from numerical models were compared with the analytical solution of such joints using the Eurocode procedure recommended in EN 1993-1-8. These results are planned to be verified and further developed based on planned experiments.
Conditioned and Orthogonalised Reverse Path Nonlinear Methods on Multi-Degree-of-Freedom System
Authors: Norfazrina H.M.Y. , Muhamad P. , Aminudin B.A. , Raihan M.R. , Azella A.W. , Zetty R.M.S.
Published: April 2015

Practical engineering structures commonly display nonlinear dynamic response when damage is present in the system. Hence, the studies on nonlinear system identification have increased within these past few years. Current study is aimed on the structural identification of nonlinear systems based on the extraction of underlying linear frequency response function (FRF). The methods chosen to obtain the FRF are the Conditioned Reverse Path (CRP) and the Orthogonalised Reverse Path (ORP) method. The well-known frequency-domain CRP method has been recognised for its ability in solving nonlinear problems; detecting and quantifying nonlinearities in structures. In contrary, the ORP is a new algorithm developed in time-domain which gives simpler formulation for describing the underlying linear dynamics of nonlinear systems. Results show that the performance of the new ORP algorithm in handling nonlinearities is as good as the CRP method. The ability of ORP method has become the aim of the current study to assess the robustness of both algorithms towards nonlinear system identification of structures with multi-degree-of-freedom (MDOF) system.
Research of Methods of Accuracy Increase of Building Weld-Fabricated Constructions
Authors: Parlashkevich Valentina
Published: April 2015

Investigation of methods of quality improvement of weld-fabricated building constructions. It is emphasized, this issue is subject to economical, social-psychological and technical factors. To the maximum extent, quality of weld-fabricated building constructions is affected by observance of requirements for accuracy of size and shapes. Accuracy of size and shapes is subject to the values of welding deformation resulting from nonuniform heating of work-pieces in the welding process and of welding heat input. The maximum heat input is observed in the process of manual (MMA) welding, the minimum heat input is a feature of mechanized (Mig/Mag) welding). Use of mechanized methods of welding will reduce welding deformation level and improve accuracy to size of construction.Experimental investigations of butt and fillet shapes have verified the conclusion.