bluuebunny/crossref_metadata_2025 huggingface dataset:
Dyeing of Silk Fabric with Natural Colorant from Dimocarpus longan Leaves
Authors: Maha-In Kongkiat , Mongkholrattanasit Rattanaphol , Klaichoi Charoon , Pimklang Wiphawan , Buathong Panida , Rungruangkitkrai Nattadon
Published: July 2016

Natural dye solution from longan leaves was applied to the simultaneous dyeing of silk fabric and using alum, copper sulfate, ferrous sulfate and stannous chloride as a mordanting agents. The dyeing properties and effects of simutaneous-mordanting on the hue, colour strength and colour value were revealed. The results show that The K/S values increased with an increase of metal mordant concentration. The mordant activity sequence was CuSO4> FeSO4> AlK(SO4)2 > SnCl2. The obtained colour values show that silk fabrics dyed without mordant exhibited dark brown colour, while those mordanted with aluminum potassium sulfate (alum), stannous chloride and copper sulfate showed a variety of medium to dark brown shades. With ferrous sulfate, the colour shade was darker and duller. The colour fastness results showed good to very good level.
Evaluating the Influence of Fiber Composition and Structure of Knitting Fabrics on Total Hand Value (THV)
Authors: Jariyapunya Nareerut , Musilová Blažena , Koldinská Marie
Published: July 2016

This paper presents analytical and experimental procedures to evaluate the influence of knitted fabrics on the total hand value (THV) for women’s winter thin dress. We examined and compared its mechanical properties, such as tensile, shear, bending, compression, surface roughness and friction properties, measured by the Kawabata Evaluation System for Fabrics (KES FB-Auto), of knitted fabrics with different fiber compositions and different types of knitted structures. The obtained results showed that the knitted structures have significantly influenced on the total hand value (THV) whereas the fiber compositions have shown a less effect on (THV). The existing results prove that the evaluation by KES FB-Auto system has been more beneficial for its basic of mechanical and surface properties. Moreover, the results could be analyzed for its new designing patterns for a refined, comfortable stretch fit.
The Development of Multimedia and Interactive System, through Network for Learning in Opportunities School
Authors: Singhatham Papatsorn , Panya Nipaporn , Intrapunya Ubolwan
Published: July 2016

This research focused on the development of multimedia and interactive system, through network for learning in the opportunities school. This system was used as a channel for students to learn outside the classroom and as a teaching management tool for teachers. Tools for system development were Microsoft Visual Studio program while the database management system was MySQL. PHP and Java scripts were for writing commands. To evaluate the efficiency of the developed system, sample group and questionnaires were processed. The population of this research was a group of teachers and students of the Bankamwa school (Weboonratsamakee) in total of 97 people. The result of experiment shows that group recognizes the performance of system in the higher level and the system is efficient for its purposes.
Cold Spray Modification of ZnO-Cu Coatings for Bacterial Attachment Inhibition
Authors: Sanpo Noppakun , Tharajak Jirasak
Published: July 2016

This research work describes the processing of antibacterial and hydrophobic feedstock suitable for marine antifouling coatings. A composition of agglomerated ZnO-Cu powder and respective produced coatings were evaluated for fouling properties via antimicrobial activity test. Wettability of coating was also determined by contact angle measurements. These new antifouling coatings aim to prevent the growth of biofilm, reduce biofouling and improve both maintenance cost and fuel efficiency of the maritime structures and vessels. It should be able to extend dry docking cycle by providing an alternative environmentally compliant coating that is long lasting compared to conventional paint coatings. The results showed that ZnO and copper composites inhibit the C. marina attachment on the coating surfaces.
Development of Thai-China Ethnic Clothes Approach to ASEAN Community: A Case Study of Thai Song Dum and Guangxi Zhuang
Authors: Changmuong Wasana , Numahan Pojana , Thangtham Usa , Sutisung Suree
Published: July 2016

This research aims to study the knowledge on costumes of Thai-Chinese minorities in order to develop and integrate on costumes of Thai - Chinese minorities. This study included 10 prototype costumes. The assessment questionnaires were commonly used in developing the study. The sample consisted of 100 interested people from Thai Song Dam Weaving Group in Tambon Donmanow No.39 Moo 2, Tambon Donmanow, Songpeenong District, Suphanburi Province and 2 groups of 20 trainees each from Thai Song Dam group in Tambon Ban Don, Amphoe U Thong, Suphanburi Province and Thai Song Dam group in Tambon Bang rakam, Amphoe Bang rakam, Phitsanulok Province. The statistics tools used in data analyzing were frequency, percentage, mean and standard deviation.
Research Performance Reporting of Rajamangala University of Technology Phra Nakhon
Authors: Singhatham Papatsorn , Eidhed Krittee
Published: July 2016

The objective of this research was to survey research data of Rajamangala University of Technology Phra Nakhon that was 1) published, 2) cited, and 3) published with regard to the collaboration of its researchers with those of other universities in both national and international journals during the years 2008-2013. Such related data was collected from journals that appeared in 1) the database of Thailand Journal Citation Index Centre (TCI), 2) Web of Science database (WoS) and 3) RMUTP Research Journal. Analyses applied included social statistics particularly descriptive statistics which were frequency, percentage and weighted score from six indicators. From the survey, it was found that there were 586 lecturers and researchers in the university 118 out of 586 had research work published. The most important findings are as follows. First, during six years (2008-2013), the university had 141 published research articles. 91 percent were published nationally and 9 percent internationally. The weighted score is 61.33. Second, there was only 12 article that was cited in a national journal, representing 8 percent. But could not find article that was cited in international journals. Finally, there were 40 articles, or 28 percent, that were produced under the collaboration with researchers from other universities.
An AHP for Prioritizing and Selecting Industrial Waste Management Method Case Study: Map Ta Phut Industrial Estate
Authors: Boonkanit Prin , Kantharos Seksan
Published: July 2016

The objective of this paper is to present an evaluation method that can aid decision to prioritize and select industrial waste management method. An Analytic Hierarchy Process (AHP) decision structure approaches to measure the relative desirability of disposal alternatives using value judgments as the input of the various stakeholders. The novel of this paper is a ﬂexible analytical program that enables decision makers to ﬁnd the best possible industrial waste management solution to complex problems by breaking down a problem into a systematic hierarchy structure among the various levels and attributes. The process of the evaluation method has been started from analyzing various factors which are used for designs the decision making structure.It is included with necessary data for consideration of management alternatives design that comprised of the technology, economics, environment, and also related regulations. The benefits of this method therefore may not only aid in selecting the best alternative but also help decision makers to understand why an alternative is preferred over the other options. A case study in Industrial Estate Authority of Thailand (IEAT), recommendations, limitations, and further research are also presented.
The Improvement of Metal Stamping Procurement Process
Authors: Boonkanit Prin , Parklumjiek Sansak
Published: July 2016

This research is aimed to improve procurement process in supply chain management with the capability to reduce environmental effect by lean production technique, and 3Rs principle, and to improve supply chain by SCOR model. The research methodology, Value Stream Mapping (VSM)is used to analyze the development of on time delivery of suppliers, and then SCOR model is applied to improve and reduce energy consumption and recycle material in supply chain. The result has been revealed that new development process could be improved on time delivery rate from 38.51% to 93.80%. This procurement process has reduced frequency of supplier's transportation from 40 to 29 times per month so it could reduce fuel consumption on average cost of 45,230.98 Baht per year, packaging cost on average of 158,295.11 Baht per year and reduce total GHG emission about 20.896TCo2e per year. Therefore,the new process can improve supply chain and being environmental friendly or sustainable green supply chain management.
Expert System Software for Production Planning and Quality Control in Bleaching Dyeing and Finishing Process of Textiles Industry
Authors: Boonkanit Prin , Charoenkid Noppawan
Published: July 2016

The objective of this research is to develop the expert software to use for planning the production process and quality control. Starting from collecting the data of knowledge, and expertise experiences, to analyze, design, tests and record in systematic ways. By using the forward chaining inference and knowledge acquisition subsystem, writing with SQL and developing by Oracle to work on Unix server and exporting through Microsoft Excel for the convenient working. Process and decision procedures show after feeding the data into the system, for estimation and sending the results to program page. According to the set up pattern, experts spend 60 minutes for a piece of work manually. After introducing this system, experts are able to reduce time consumption by 98.33 %. Previously they spend 45 minutes/120 yards to check of fabric. Time consumption is reduced 55.55%, this means the increasing production result of 3,072 yards/day and the average cost is 61,440 baht/day. The investment is paid back within 26 days. This system can be used without experts who have estimation experiences. It does not need any specialized persons. This is the way to preserve the knowledge and solve the problems which may occur at the workplace. It is the foundation for managing the value added production system to be stable and sustainable.
Friction Coefficient and Worn Surface of Ferromagnetic Materials under Magnetic Fields
Authors: Tharajak Jirasak , Nicomrat Duongruitai
Published: July 2016

Several machine components including a part of electrical circuit box, an electrical motor and an automotive part were common ferromagnetic materials used under the magnetic fields. In the general, their friction had occurred in the magnetized materials during operation. The friction coefficient of the sample under magnetic fields was different from the sample without magnetic field treatment. Its friction coefficient had correlation with wear behavior of specimens. The wear protection procedures for the ferromagnetic parts during operation are recognized different from others without magnetization. Its friction coefficient was thus used to measure the wear characteristics with a ball on disc friction tester. The microstructure of wear trace and debris was investigated by scanning electron microscope. From the results, the magnetic fields affected the change of friction coefficient. The friction coefficient was decreased with an increasing magnetic intensity. This was because the wear debris was induced and thus decreased the adhesive wear mode during friction test.
The Study of Welding Repair Parameters of Tube 35Cr-45Ni-Nb Alloy of the Ethylene Heating Furnace
Authors: Singhatham Chokchai , Eidhed Krittee
Published: July 2016

The aim of this research is to study the effects of welding repair parameters on weld joint of tube 35Cr-45Ni-Nb alloy by using the Gas Tungsten Arc Welding (GTAW) process of two different base metals. One was a new tube material and other was a used tube treated with carburized condition. The 35Cr-45Ni filler metal was sellected for welding repair experiments. The SEM-EDS analysis was used to observe a segregation of atom in the used tube specimen. The non-destructive examination (NDE) tests were done to check the imperfected area of weldment and heat affect zone (HAZ). Data from this research can be used as the guideline suggestion for the welding procedure specificcation (WPS) and the procedure qualification record (PQR) for the welding repair in the peroid of maintenace.
Microbial Comparison in Synthesizing Gold Nanoparticles for Harvesting Gold in Wastewater System
Authors: Nicomrat Duongruitai , Tharajak Jirasak , Kanthang Paisan
Published: July 2016

Since the green chemistry strategy of the use of biological process is well known for its safe, easy, nontoxic, biocompatible and especially environmental friendly to all users. Recently, more nanomaterials synthesized by the uses of plants and/ or microorganisms are applied in many areas such as electronics, nanotechnology. Especially they are used to synthesize novel materials with unique properties and purposes. In this study, the researchers aimed to isolate microorganisms with the capability in gold nanoparticles (AuNPs) synthesis from the sources that are from gold management process such as leaching and washing process in gold/ jewelry carving factory. Three isolated genera composed of bacteria, yeasts, fungi synthesizing intracellular AuNOs were obtained and characterized for their species by PCR amplification of rDNA genes and sequence analysis and comparisons. They were Pseudomonas sp., Verticillium sp., Aspergillus sp., and Saccharomyces sp. The factors including pH, temperature, reducing agents, duration of AuNP formation were determined. The predominantly extracellular gold formation as a major criterion for synthesis of AuNPs was also chosen. The obtained isolates can be certain potential in future practical application in harvesting AuNPs from the waste water in most gold carving factory.
High Quality Characteristics of Briquette Fuel Based on Physical Appearances and Electrical Induction
Authors: Nicomrat Duongruitai , Somkid Parinya , Chuaiwan Kitti
Published: July 2016

At present, charcoal briquette fuel, a source of heat energy and mostly made from agricultural waste materials, are popular in the markets because of their high constant heat output. It helps reduce pollution, and produce no sparks while burning, but varied due to different types of materials, burning protocols, temperature, and pressure used. In this study, the research team have studied the characteristics of high quality fuel briquettes for possible further development of standard indicators of briquette fuel production process. In the study, key factors of the Charcoal fuel features composed of high qualities of physical characteristics and electrical induction. Activated carbon and coconut shell charcoal types were showed to be great materials. The production process involved aerobic burning at 800-900oC for at least 3 hours, grinding and mixing with starch binder. The briquettes’ electrical conductivity was especially lower than 10 kΩ. High heat production was obtained at least 6000 Cal/g while ground charcoal possessed with the sizes were varied. Under microscopy, the charcoal particle sizes were in a range of 50-100 μm for 30-50% (w/w), size of 10-50 μm for 20-40% (w/w) and distinctive numbers of holes greater than 300 μ to 1 mm were rarely observed. Therefore, with key characteristics of charcoal briquette fuel, it could be further applied for development the indicator as well as instruments to measure the quality of the briquette.
Investigation of Optical Spectroscopic Properties on Fluorescent Creams
Authors: Sukprasong Saksit , Limpichaipanit Apichart , Ngamjarurojana Athipong
Published: July 2016

The optical spectroscopic properties of fluorescent materials were investigated using laser induced fluorescence technique. The fluorescent creams were used in this research. The sample materials were illuminated by UV laser excitation source. Then, the fluorescence spectra were recorded and analyzed by fiber optics spectrometer complied with the CIE 1931 XYZ color space which is essential for color management. The result showed that the characteristics of fluorescence spectra such as intensity, wavelength position and bandwidth in each fluorescent creams exhibited distinct characteristics in each species.
Effect of Hydroxide Concentration and Adding Ascorbic Acid on Morphology Shape of Zinc Oxide Nanostructure Prepared by Simple Chemical Precipitation Method
Authors: Chaithanatkun Natpasit , Onlaor Korakot , Thiwawong Thutiyaporn , Tunhoo Benchapol
Published: July 2016

A chemical precipitation method was used to prepare zinc oxide (ZnO) nanostructure in the present of zinc nitrate and ammonium hydroxide as zinc precursor and hydroxide precursor respectively. The effect of the hydroxide concentration and the effect of adding ascorbic acid as modifier into the mixture solution on the morphology property of zinc oxide was studied. The morphology and the structural of ZnO nanostructures were investigated by field-emission scanning electron microscope (FE-SEM) and X-ray diffractometer (XRD) techniques, respectively. The results showed that the basicity solution and adding stabilizer are important parameters on the morphology and structural properties of ZnO nanostructure. At a low hydroxide concentration, ZnO exhibited flower-like structure with short petal. With a further increase to higher concentration, ZnO crystal have more crystal directional growth. When the ascorbic acid was added, the morphology changed to particle-like structure. ZnO nanostructure with different shape might be used for specific applications such as gas sensor etc.
State Diagrams of Two Thai Rice Varieties Differing in Amylose Contents
Authors: Boonrod Chutamas , Srikaeo Khongsak
Published: July 2016

State diagram is a map of the different states of a food polymer as a function of water or solids content and temperature. The main advantage of drawing map is in identifying different states of a food polymer which helps in understanding the complex changes when food's water content and temperature are changed. It also assists in identifying food’s stability during storage as well as selecting suitable conditions for processing. This research successfully developed the state diagrams of two Thai rice varieties differing in amylose contents (San-pah-tawng and Phitsanulok 2) by measuring the glass line; glass transition temperature (Tg) vs. solids content, freezing curve; initial freezing point vs. solids content by using the differential scanning calorimetry (DSC) method. Rice with different amylose content exhibited similar freezing curves and glass transition patterns. The state diagrams obtained in this study are in agreement with previously published data. They can be useful in optimizing the drying and freezing processes as well as studying the physicochemical changes during storage of rice.
Mechanical Behavior of PLA/Clay Reinforced Nanocomposite Material Using FE Simulations: Comparison of an Idealized Volume against the Real Electron Tomography Volume
Authors: Jimbert Pello , Iturrondobeitia M. , Fernandez-Martinez R. , Guraya T. , Ibarretxe J.
Published: July 2016

The present work describes a methodology to implement microstructural data obtained from TEM tomography into finite element (FE) simulation software. In this first approach the tomographic reconstruction is treated with different software to create a 3D realistic model of the microstructure of the composite. This realistic model is compared against 2D image-based models via FE simulations in order to compare the mechanical behavior achieved with both procedures. After this first study the results obtained with both types of model are similar. These results are a promising starting point for the development of this novel methodology for obtaining nanocomposite FE models from TEM tomography with realistic results.
Valorization of Waste Food Industry for Producing Second Generation Bioethanol
Authors: Capdevila Verónica Elizabeth , Gely María Cristina , Kafarov Viatcheslav , Pagano Ana María
Published: July 2016

The aim of this report is to introduce a simulation model of the process of obtaining second-generation bioethanol from waste food industry (rice husk and whey), using Aspen HYSYS simulator in stationary state. The objective is to add value to this waste for the production of sustainable biofuels, helping to solve two problems shortages of oil and the generation of effluent dairies. The model includes the steps of hydrolysis, fermentation and separation of bioethanol generated from lignocellulosic waste (rice husk) in combination with whey, achieving the equipment design and operating conditions to reach a production of bioethanol of 7.57 t/h with a purity of 91.9% w/w from 28.89 t/h of pretreated biomass and 88 t/h whey.
Studies on Titanium Cenosphere Composite Developed by Powder Metallurgy Route
Authors: Dutta Majumdar Dibyendu , Mondal Dehi Pada , Roy Chowdhury Amit , Rao Harish , Majumdar Jyotsna Dutta
Published: July 2016

The present study concerns detailed microstructural investigation and property evaluation of titanium-cenosphere composite developed by powder metallurgy route. The main process variables for the development of titanium-cenosphere composite were cenosphere particle size, sintering time, and sintering temperature. Followed by sintering, a detailed characterization of the sintered parts in terms of density, microstructure, composition and phase has been carried out. The compressive strength of the sintered component has also been evaluated in details. The density of the sintered pellets varied with process parameters and is significantly reduced (2.5-2.11 g/cm3) as compared to as-received titanium (4.5 g/cm3). The compressive yield strength of the sintered pellet is reduced as compared to as-received Ti-6Al-4V.
Electrochemical Behavior of Cobalt-Chromium Alloy as Biomaterial in Different pH Environments
Authors: Benea Lidia , Dumitraşcu Valentin Marian , Dănăilă Eliza
Published: July 2016

The paper discusses the electrochemical interactions of Co-Cr alloy with different physiological solutions and organic substances, containing different ions and different pH values, which should play a key role in the materials lifetime. The physical and chemical reactions are numerous and the passivity of the Co-Cr alloy is submitted to the influence of the liquid environment. Some electrochemical investigations were carried out for understanding and predicting the passivity and the corrosion resistance of Co-Cr alloy in three types of simulated body fluids (SBF), namely Fusayama Meyer artificial saliva (pH=5), Hank’s solution (pH=7.4), Ringer's solution (pH=6.6) and citric acid as organic solution. The reason of using another type of environment (other than SBF), such as citric acid is that this medium is a powerful oxidant and has a lower pH value (pH=1.8). This acid environment can influence the state (the formation and growth) of the oxide layer on the surface of the alloy. Research has shown different behavior of the cobalt chromium alloy according to the pH, the chloride content and the oxidizing nature of the environment. Co-Cr alloy biomaterial, immersed in four aqueous media reveals that there are different levels of stabilization of the potential and different current densities depending on the pH value. The Co-Cr alloy biomaterial is very sensitive to localized corrosion (pitting) in Hank solution.
Comparative Tribocorrosion Resistance in Physiological Solution of Untreated and Modified Ti-6Al-4V Alloy Surface by Electrodeposition of Hydroxyapatite Coatings into Nanoporous Titania Layers
Authors: Dănăilă Eliza , Benea Lidia
Published: July 2016

Metallic biomaterial are the most suitable for replacing failed hard tissue up to now and for that is important to know the tribocorrosion resistance of these materials before use in biomedical applications. Surface engineering can play a significant role in extending the performance of medical implants made of titanium and its alloys. In this work was chosen electrodeposition of hydroxyapatite (HA) coatings into nanoporous titania layer formed by anodic oxidation as modified Ti-6Al-4V alloy surface. The comparative tribocorrosion behavior of untreated Ti-6Al-4V alloy surface, anodic nanoporous TiO2 surface and electrodeposited hydroxyapatite (HA) coatings into nanoporous TiO2 layers has been investigated in a bio-simulated fluid solution. The results of these investigations have shown that both surface treatments applied have improved the tribocorrosion resistance and friction coefficients as compared to the untreated Ti–6Al–4V alloy surface.
Characterization and Corrosion-Resistance Performance of Hybrid Co/UHMWPE Composite Biocoatings
Authors: Benea Lidia , Bounegru Iulian , Chiriac Alexandru
Published: July 2016

Novel hybrid Co/UHMWPE biocoatings were obtained by electrochemical deposition of cobalt from a cobalt sulfate plating bath with ultra high molecular weight polyethylene (UHMWPE - particle size of 10 μm) as dispersed particles in order to provide possible biomedical coatings applications. The surface morphology and topography, roughness and chemical composition were investigated, as a function of UHMWPE particles concentration in the plating bath by scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive X-ray analysis (EDX). Electrochemical corrosion resistance investigations were carried out in simulating body fluid solution (SBF), using electrochemical impedance spectroscopy (EIS) method at different exposure times. The results proved a good corrosion resistance of the obtained hybrid Co/UHMWPE coatings.
A Review of Use FEM Techniques in Modeling of Human Knee Joint
Authors: Sahu Nitin Kumar , Kaviti Ajay Kumar
Published: July 2016

The human knee joint is very critical and complex joint of human body which is responsible for our optimal daily functions. It consists of various bones – femur, tibia, patella, fibula, different ligaments, cartilages, menisci and muscles. FEM is a very useful tool for the analysis of knee joint and various knee replacement products. In the knee replacement surgery a proper understanding of knee joint biomechanics is essential. Because of certain limitations of experimental studies, FEM analysis process is playing a significance role for prominent understanding of knee biomechanics and produced an effective and impressive tool for total knee replacement (TKR/TKA) or partial knee replacement (PKR/PKA). The aim of this paper is to give a review on FEM analysis of human knee joint and knee prosthesis devices and how much adequate this method for these type of analysis.
Bactericidal Coatings for Bone Implant Applications
Authors: Mediaswanti Kun
Published: July 2016

Infections after bone implant surgeries have remained one of the leading underlying cause of revision surgery due to implant failure. Despite careful and improved surgery procedures and systemic antibiotic prophylaxis are well practised, the possibility of infection still exists. Many strategies have been studied to prevent post-implant infections, such as anti-bacterial coatings, adhesion resistant coatings, and anti-microbial alloying element. To respond on the challenge of reducing the risks of infections after bone implantations, a review that focused on the effectiveness of anti-bacterial coatings on metallic implants are briefly presented.
Hollowfiber Polyurethane-Collagen Coating Chitosan as Nerve Graft for Therapy of Peripheral Nerve Injury in Extreme Paralysis
Authors: Nur Maulida Hendita , Qulub Fitriyatul , Rosdiani Azizah Fresia , Purnama Disca Sandyakala , Dwi Saraswati Karina , Widiyanti Prihartini
Published: July 2016

Peripheral nerve injury with gaps between 5 and 30 mm can result in permanent paralysis because axons are cut. The distance between axons, which is more than 1-2 cm, needs graft in the form of nerve connecting pipe in order to repair the defects. A synthesis of hollowfiber polyurethane-collagen coated by chitosan was carried out to identify its potential as treatment accelerator for peripheral nerve injury. The result of Fourier Transform Infrared (FTIR) analysis showed multiple links between chitosan and glutaraldehyde, which can be seen in wavenumber shift from 1080-1100 cm-1 to 1002 cm-1. The degradation test result revealed that the sample displayed mass loss after it was soaked in simulated body fluid(SBF) for seven days. Polyurethanecan be degraded in the body after 30 days. This converges with the nerve mechanism that regenerates at the rate of 1 mm/day or 1 inch/month. The result of tensile test indicated that modulus values of chitosan coating variation of 1%, 1.5%, and 2% were 4.75 MPa, 4.74 MPa, and 7.67 Mpa respectively. The outcome of scanning electron microscope(SEM)showed that hollow fiberhas a diameter of 2.021-2.032 mm, which matches the diameter of peripheral nerves ranging from 1.5 to 3 mm and the membrane pore size of 31.33-39.65 μm. The result of MTT assay demonstrated that the percentage of viable fibroblastBHK-21cells was exceeding 50%, which means that the sample does not have toxic properties. The result of this study is expected to provide theoretical basis for the utilization of polyurethane-collagen coating chitosan as nervegraft for theraphy of peripheral nerve injury. The utilization is possible due to the fact that the composite exhibits biocompatible, regenerative, and easily degradable characteristics. Moreover, it could become an alternative solution to answer the need of a more affordable and easier-to-produce nerve graft, so it can be mass-produced in Indonesia.
Influence of Different Coupling Agent Type on Processibility and Applicability of Polymer Composites
Authors: Seidl Martin , Habr Jiří , Bĕhálek Luboš , Šafka Jiří , Ackermann Michal , Bobek Jiří
Published: July 2016

The contribution deals with the processibility and applicability of polymer composite systems based on polypropylene matrix. The composites were filled with vegetable fibres (particularly the cotton fibres, coir fibres, hemp fibres and jute fibres) and the interface between the polymeric matrix and the natural fibres was modified using two types of coupling agents (the organosilane coupling agent and maleic anhydride grafted polypropylene). For evaluation of the final impact of all three phases presence on the processibility of the polymer composite the melt flow behaviour was analyzed (MFI analysis according to ISO 1133) for the filler concentration of 10, 20 and 30 wt. %. This study involves also the natural fibre surface profile analyses (based on SEM observation) and the applicability of created composite materials was determined using the heat deflection temperature (HDT analysis according to ISO 75).
Analysis of Parameters with Influence on Material Shrinkage PLA and PLLA
Authors: Kučerová Monika , Lenfeld Petr
Published: July 2016

The Paper deals with problematics of analysis of shrinkage biodegradable polymer materials PLA and PLLA in consequence with setup of parameters. Samples for analysis were prepared by technology of injection molding with parameters set according to Taguchi method. The parameters setting consist of injection speed, holding pressure, temperature and wall thickness. Dependency of parameters measured inside of the mold was compared to parameters set on molding machine. By this comparison we have received data for material processing in praxis.
Thermal Degradation of the Thermoplastic Elastomers during the Injection Moulding Process
Authors: Bĕhálek Luboš , Habr Jiří , Seidl Martin , Lenfeld Petr , Boruvka Martin
Published: July 2016

The thermal degradation of the thermoplastic elastomers (TPEs) during the injection moulding process – depending on the melt temperature and residence time of the processed material within the barrel of the injection unit, was studied on the basis of oxidation induction time evaluation (isothermal OIT) of the moulded parts (according to ISO 11357-6) and their physical and mechanical properties, according to ISO 1183-1, ISO 37 and ISO 7619-1. TPEs with different chemical compositions intended for automotive, industrial and medical applications were analysed during the study of the thermal degradation process.
Dynamic-Mechanical Properties of Polymer Composites with the Short and Long Glass Fibers
Authors: Lenfeld Petr , Bĕhálek Luboš , Boruvka Martin , Prusek Jan
Published: July 2016

Nowadays the use of glass fibers in development of polymer composites creates a very interesting research area aiming to achieve multiple outputs to different applications. The use of thermoplastic composites reinforced with glass fibers in engineering applications like automotive industry has increased considerably in the last few decades. These composites combine high mechanical strength properties, reduced mass, easy processing and corrosion resistance. The shifting from metals to engineering composites pushes towards lightweighting benefits which results in improved fuel efficiency. This paper is focused on the assessment of polymer composites properties on the basis of polyamides (PA6.6) with the short (GF) and long glass fibres (LGF). The bulk characterization of all samples has been made by Dynamic Mechanical Analysis (DMA) depending on temperature, stress frequency and the weight percentage of reinforcement in matrix.
Use of Composite Materials for FDM 3D Print Technology
Authors: Šafka Jiří , Ackermann Michal , Bobek Jiří , Seidl Martin , Habr Jiří , Bĕhálek Luboš
Published: July 2016

This article deals with specific polymer composites modified for the Fused Deposition Modelling (FDM) which is a 3D print technology. These two phase systems involve thermoplastic matrix filled with natural fibres. The crucial demand of this progressive technology is put on the accuracy of the semi-product formed into the filament shape. To reach the smooth production of 3D prototypes the filament should have a constant diameter. In the article, individual steps of the polymer composite pelletization and following pre-processing and processing activities are described. Among these steps the extrusion of the filaments belongs and subsequent print test on “RepRap” device accompanied by optimization of building parameters. Tensile specimens were chosen for print with regard to maps mechanical properties of this newly developed material which was the final stage of this work. Tensile test curves were then compared with those graphs which can be found for the material produced by conventional technologies such as injection moulding.
Optimal Cutting Conditions for Surface Finishing of Parts Made of Photopolymers
Authors: Keller Petr
Published: July 2016

The article deals with finishing parts manufactured by means of PolyJet 3D Printing additive technology using Objet500 Connex made of polymers with trade names "Vero White Plus" and "Digital ABS". A turning technology on a CNC turning lathe was used for finishing the surface of the parts. The goal of this article is to find optimal cutting conditions for finishing operations by turning of these materials with regard to the best surface quality possible even during interrupted cutting.
Finite Element Simulation of Physical Phenomena in Real Conditions of a Single Grain Cutting Process
Authors: Forysiewicz Monika , Kukielka Leon , Gotowala Katarzyna
Published: July 2016

The cutting process was presented as a real object as well as its physical and mathematical modelling. For the description of the non-linear phenomena, at the typical increment ratio, the updated Lagrange's description was used. Adequate deformation and stress increments measurements were used, e.g. Green-Lagrange's deformation tensor increment and the increment of the Piola-Kirchhoff's second symmetrical tensor. Nonlinearity of the material was described by means of the increment model taking into consideration the deformation and deformation rate records. The workpiece is treated as a body in which there may be elastic deformation (in the range of reversible deformation) and visco and plastic (in terms of irreversible deformation), with nonlinear hardening. For the construction of the material model Huber-Mises-Hencky's non-linear plasticity condition was used, associated principle of flow as well as mixed hardening (isotopic-kinematic). The condition of the material after pre-machining processes was also taken into account by means of implementation of initial conditions of: displacement, strain and stress. Yield stress of the body was described by a Cowper-Symonds' model allows for linear-isotropic, kinematic or mixed plastic strain hardening and the effect of the intensity of plastic strain velocity. The applications in ANSYS program and results of numerical calculations were presented. A method of generating a three-dimensional abrasive grain with a geometry close to actual were describes. The influence of the process parameters on the states of strains and stresses and on the quality of the product was presented. Numerical calculations of cutting process with single abrasive grain were made and investigated the deformation and stress occurring in the workpiece. The experimental test stand of single abrasive grain cutting process, the test plan and the verifications of results of numerical simulations were describes. The results were statistically developed and that’s give the models in the regression function form.
Determining of Shear Modulus for the Samples Circular and Hollow Circular Cross-Section
Authors: Labašová Eva , Ďuriš Rastislav , Labaš Vladimír
Published: July 2016

The contribution is focused on estimating the shear modulus of the samples of circular and hollow circular sections by static method. The samples were loaded by simple torsion, individual sections were stressed by shear stress. Theoretical basis are determined by linear elasticity and strength theory and they define the relation between shear modulus, maximum shear stress and relative strains. Relative strains are determined by using measurement apparatus and measurement system Quantum X MX 840.
Modeling the Failure Tree Analysis for Safety-Critical Systems in the Production of Hazardous Materials
Authors: Gabriska Darja
Published: July 2016

During a manufacturing process of automotive clutch an explosive substance – xenon is produced. Concentration of this substance must be monitored. Implementation of controls is performed by a safety-critical functions control system.Among main role during the process of risk assessment analysis belong determination of danger and dangerous events associated with the devices. Proactive planning errors and the use of appropriate standards can greatly reduce formation disorders thereby reducing the probability of dangerous consequences. The standard safety subsystems architectures and computation methods for determining the failure intensity is listed in the standards IEC 61508 and IEC 61511. These standards contain information tables with the results of these computations for selected parameter values.We propose a complete failure probability model for the safety functions of the control system. This model is designed to compute the intensity of the critical failure for the standard channel architectures.These architectures were designed with respect to the standard IEC 61508 and were implemented in Matlab.
Influence of Machining and Heat Treatment on Deformations of Thin-Walled Bearings
Authors: Stancekova Dana , Steklac Dušan , Petru Jana , Zlámal Tomáš , Sadilek Marek , Janota Miroslav , Kordik Marek
Published: July 2016

Paper deals with identification of the main causes of deformations of the thin-walled bearings and comprehensive analysis of the causes of bearing deformation and suggestion of the possible solutions. It deals with the analysis of bearing steel, its characteristics and causes of deformation of bearing rings during heat treatment and manufacturing process. Provides experimental measurement and report of uniformities on the surface of bearing rings - called oval and cradle, metallographic analysis of rings, as well as an analysis of various processes affecting the formation of deformations.​
The Effects of Cutting Parameters on Surface Texture of Hybrid Composite CFRP/AL2024
Authors: Mohamed Saiful Bahri , Mohamad Wan Noor Fatihah , Muhamad Martini , Ismail Jailani , Yew Been Seok , Mohd A. , Ibrahim Zakaria , Musanih Muhamad Ruzlan
Published: July 2016

The use of hybrid composite materials has increased due to their special mechanical and physical properties. However, machining of these materials is extremely difficult due to non-homogeneous, anisotropic and highly abrasive characteristics. The performance of machined surface quality of CFRP/Al2024 was described using two level factorial methodology. This research aims to study the interaction effects and significant factors of cutting parameters on the surface quality and optimise the cutting parameter for the surface quality of CFRP/Al2024 1μm to 2μm. The trimming process test was performed under dry conditions using burr tools 6mm diameter of end mills. The factors investigated were spindle speed (N), feed rate (fr) and depth of cut (dc), meanwhile profile roughness parameters (Ra) of CFRP and Al2024 were the response variables. Results show that the best estimated value of fr should be 500 mm/min to 530 mm/min, N is between and 2313.870 rpm to 2336.042 rpm. For both responses, N is the most significant effect followed by fr and dc.
Formation and Transport Mechanism of Hydrogen Sulfide in Coal Seam
Authors: Huang Liu Ke , Wu Yu Liang , Fan Kai Xiang , Wang Ying Jie
Published: July 2016

H2S gas would pose a threat to coal mine safety. This article from the biodegradation, microbial sulfate reduction, thermal decomposition chemistry, chemical sulfate reduction and magmatic 5 aspects to analyze the formation mechanism of hydrogen sulfide gas in coal mine, a coal mine combined with field data, analysis of hydrogen sulfide gas in the coal mining the transport mechanisms. Research for the comprehensive management of coal mine hydrogen sulfide gas has certain significance.
Down Milling Cutting Parameters Optimization Utilizing the Two Level Full Factorial Design Approach
Authors: Ismail Jailani , Muhamad Martini , Mohamed Saiful Bahri , Mohd A. , Mohamad Wan Noor Fatihah , Ibrahim Zakaria , Musanih Muhamad Ruzlan
Published: July 2016

The direction of feeding the work piece and cutter rotation determines the type of machining mode either it is up milling or down milling. Each of this machining mode affects the quality of machined surface produced. This paper described the experimental design of down milling operation on a stack of multidirectional CFRP/Al2024. Three cutting parameters were considered namely, spindle speed (N), feed rate (fr) and depth of cut (dc). Two level full factorial design was utilized to plan systematic experimental methodology. The analysis of variance (ANOVA) was used to analyse the influence and the interaction factors associated to surface quality. The results show that the depth of cut is the most significant factor for Al2024, and for CFRP the spindle speed and feed rate are significant. Surface roughness of CFRP is found to be at 0.594 μm at the setting of N = 11750 rpm, fr = 750 mm/min and dc = 0.255 mm. Meanwhile for Al2024, the surface roughness is found to be at 0.32 μm. The validation test showed average deviation of predicted to actual value surface roughness is 3.11% for CFRP and 3.43% for Al2024.
Endothelial Dysfunction in Idiopathic Sudden Sensorineural Hearing Loss: A Review
Authors: Quaranta Nicola , De Ceglie Vincenzo , D’Elia Alessandra
Published: July 2016

An endothelial dysfunction has been described in idiopathic sudden sensorineural hearing loss (ISSHL) patients. The purpose of our review was to: i) identify, evaluate and review recent research about cardiovascular risk factors involvement and signs of endothelial dysfunction in ISSHL; ii) implication of these discovering in clinical practice and future research. A Medline literature search was conducted to identify any study on the involvement of endothelial dysfunction in ISSHL, published in the English language in the last decade. The following MEDLINE search terms were used: sudden sensorineural hearing loss (SSHL) and endothelial dysfunction (text words). Additional studies were identified by hand searching the references of original articles and review articles. Studies were not excluded on the basis of the qualitative or quantitative definitions of SSHL, treatment regimens, or outcome measures. Data were extracted from included papers by a reviewer. Information on the patients, investigations, methods, interventions, and outcomes were systematically analyzed. Characteristics and results of all included studies were reviewed systematically. High levels of adhesion molecules, hyperhomocysteinemia and lower folate levels, unbalanced oxidative status, a lower value of flow-mediated dilatation of brachial artery and a reduced percentage of circulating endothelial progenitor cells in patients affected by ISSHL support the hypothesis that this syndrome should be considered as a microcirculation disorder based on endothelial dysfunction and drive clinicians to implement all the traditional strategies used for preventing cardiovascular events, to also reduce the likelihood of ISSHL occurrence.
The biological reducing agent Oxyrase improves the resuscitation of dormant Mycobacterium smegmatis and Mycobacterium avium subsp. paratuberculosis
Authors: Rock Kelly E. , Kinkead Lauren C. , Secott Timothy E.
Published: July 2016

Mycobacterium avium subsp. paratuberculosis (MAP) is the etiologic agent of Johne’s disease, a chronic intestinal disease of cattle and other ruminants. Diagnostic culture for MAP is typically unrewarding until latter stages of the disease. This may be a consequence of oxidative damage to dormant organisms, which results from culture. The purpose of this investigation was to determine the effect of the commercial reducing agent Oxyrase® for Broth (OB) on the recovery of dormant Mycobacterium smegmatis (MS) and MAP. Dormant organisms were inoculated into medium only or that supplemented with media containing serial dilutions of OB. Growth was monitored by optical density for up to 21 days. Treatment of MAP and MS with OB led to significant increases in recovery and growth yield. However, the concentration of OB necessary to promote recovery was dependent on the number of viable organisms present in seed cultures. Mitigating oxidative damage by using OB can facilitate the recovery of dormant mycobacteria. Whether this is a direct or indirect effect has yet to be be established.