Periodicals of Engineering and Natural Sciences (PEN - International University of Sarajevo)
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Design for Additive Manufacturing: Benefits, Trends and Challenges
Get PDFIn past five years, there has been a rapid increase in the publication on additive manufacturing (AM). Many technologies have been introduced in a rapidly growing market. The designers are confronted with many challenges in designing products for additive manufacturing. AM offers significant advantages, but there are also many constraints for AM to be used in its full potential. This paper explores trends, issues and challenges in design for AM, including associated costs, design options, quality considerations. It has been found that AM is in its infancy, there is insufficient understanding of the process, method, strategies, tools applied in design for additive manufacturing process, while process quality and capabilities are continuously improving
Compression Properties of Woven Carpet Performance under Dynamic Loading
Get PDFAlthough carpets are seen as decorative products for consumers, it is important that they must have optimum quality performance. The most important features affecting quality performance are pile fiber, pile yarn, pile height, pile density, carpet surface structure (cut pile or loop pile), carpet construction etc. During usage the carpet are exposed to a number of forces due to compressional loading such as dynamic or static. To counteract these forces, the resilience of pile yarn is vital. This paper demonstrates the influence of pile density and pile height of structure parameters on compression performance which was exposed to dynamic loading. In that respect, acrylic fiber was used as pile to manufacture Wilton face-to-face cut-pile carpets at two pile densities (2400 piles/dm2, 2880 piles/dm2) and three pile heights (7 mm, 11 mm and 16 mm). To determine the compression properties, carpets were subjected to dynamic loading at 50, 100, 200 and 1000 impacts. Thickness of carpets was taken at each of these four impacts. Finally, thickness loss of carpets as well as compression performance was detected. In order to identify the effect of pile density, pile height and number of impact on thickness loss of carpet after dynamic loading, analysis of variance was performed statistically. Results showed that pile height, pile density and number of impact have statistically significance on compression performance of carpet samples
Treatability of Tannery Wastewater by Electrocoagulation Process
Get PDFThis study investigated the treatability of tannery industry wastewater by electrocoagulation (EC). The wastewater sample was taken from a leather factory of Mixed Organized Industrial District in Bor-Niğde, Turkey. Treatment of the wastewater was carried out by an electrochemical batch reactor equipped with aluminum electrodes, which were connected parallel to each other. In the EC of the wastewater, the effects of pH, current density and electrolysis time were examined. The optimum operating conditions were determined and applied to the process. The optimum current density for removal of COD and TSS in the tannery wastewater were 18.9 mA/cm2 and 22.7 mA/cm2 at 20 min electrolysis time and pH 6, respectively. The obtained results indicate that EC reactor is the applicable option to treat tannery industry wastewater in terms of removal efficiency and operating cost
Optimization of Wear Parameters of Polyamide-6 Composite Materials Filled with Wollastonite Particles
Get PDFWeight loss and friction coefficient prediction models for polyamide-6 (PA-6) composites filler with 0,5 and 10 wt.%wollastonite (W) particles was developed using Taguchi method by considering the parameters of sliding speed,applied load and filler ratio. The wear behavior of the specimen was investigated using pin-on-disc arrangement wherethe samples sliding against a AISI 4140 steel disk under different conditions. The wear tests were realized at the slidingspeeds of 1.0, 1.5 and 2.0 ms-1 and under the loads of 6, 10, and 20 N. The obtained weight loss for with 5 and 10 wt.%wollastonite (W) particles PA-6 composites are lower than pure PA-6 weight loss under the same test conditions. Theorthogonal array, signal-to-noise ratio (S/N) and analysis of variance (ANOVA) were employed to study the optimaltesting parameters on composite samples. The estimated S/N ratio using the optimal testing parameters for specific wearrate were calculated and a good agreement was observed between the predicted and actual weight loss for a confidencelevel of 90%
Testing the random walk hypothesis of stock indexes through varianceratio
Get PDFThe Random Walk is considered to be a tool trying to explain the characteristic of movement of prices in the financial markets. It can also be seen in the form of a trial to demonstrate the non-predictability of futurechanges in the financial markets through reliance on the characteristics identified based on past price changes. In this paper used is the variance-ratio test initiated by Lo and MacKinlay to test the Random Walk Hypothesis for a more recent data of eleven Stock Indexes, seen as main indexes of the current market
Multi-version representation of historical event
Get PDFThe digital humanities are a field of research, teaching and engineering at the crossroads of computer science and the arts, literature, human and social sciences. Historical disciplines focus on digital tools, especially databases. Current interests and efforts focus on the representation of historical knowledge in order to facilitate the diffusion, sharing and exploitation of collective knowledge. In this context, we propose in this article a representation model of historical event. The particularity of our model is to represent simultaneously multiple versions of the same event from different sources. Furthermore, we discuss our model as a field of expertise for new research and investigation problems
The impact of internet of things on customer service: A preliminary study
Get PDFThe study discuss about internet of Things on serving passengers at Queen Alia International Airport in Amman, Jordan, by knowing its importance and how to minimize its shortcomings in order to improve customer service at the airport. This research allowed us to understand the fears that travelers had, which, if provided, would ensure greater service improvement. Search results show that there is a great impact on Internet things on customer service. The results showed that the variables (safety and scalability) have a statistically significant impact on customer service. While the cost has a clear positive effect, it is not statistically significant. The study also showed that there is a significant impact on the cost of customer service. Security plays an important role in customer service, meaning that there is a significant security impact on customer service. It shows that the most important factor in customer service is security. Extensibility is the key to a successful Internet object system and it is important to focus on it
Cooperation scenarios in multi-agent water monitoring platform
Get PDFMonitoring as well as achieving related water quality goals for rivers is a challenge on several scales of both space and time. There are several factors influencing the most effective actions to implement, when it comes to water quality. Collecting water quality data can be challenging and expensive as maintaining specialized equipment can raise costs over time. Within the MultiMonD2 project, a multi-agent platform of micro-laboratories specialized in the water quality monitoring of the Danube river and Delta is being developed. Aerial and surface water vectors are used as carrier systems for sensor-based detection equipment along with a technical solution that allows the cooperation between the robotic vectors. To this end the paper presents architectural solutions for realizing the multi-agent monitoring platform as well as analyzes different possible scenarios for cooperation between aerial and surface water vectors
Analysis of flow dynamics on Buslaev contour networks
Get PDFTraffic flow models on networks are relevant because of exponential growth of road transport in megalopolises worldwide. But there are not enough adequate approaches to describe such processes. Buslaev A.P. with co-authors had introduced networks of contours with common nodes, local particles movement on each contour in given direction and competition resolution rules in common nodes. The problem is to study limit system behavior in dependence on initial conditions. In mathematical models of communication systems and computer networks, particles correspond to messages or information blocks (message packages). Behavior of particles on a contour chain with two cells on each contour is similar to behavior of Ising model used in quantum mechanics. In particular, Ising model is used for modeling of behavior of experimental computers based on principles of quantum mechanics. Contour network models can be used for study of spectral quantization. We study a behavior contour networks of Buslaev type for regular cases depending on rules of competition resolutions in common nodes. Exact results were obtained for closed chain with opposite and odd-even resolution rules, and stochastic version of left-priority rule with non-zero probability of indecisive movement
Use of language games in advertising texts as a creative approach in advertising management
Get PDFThe article analyzes the essence of language game, different approaches to the interpretation of this category, its potential for creating the effect of communicative influence on the consumer in the advertising text. Language game is seen as conscious violation of language norms, rules of linguistic behavior, distortions of language cliche in order to provide more expressive power to the text of an advertisement. Game strategies are implemented in three types of advertising such as advertising texts, slogans and advertising names. Authors use descriptive method, which includes observation, generalization, interpretation and classification of the test material, component analysis method. A totality of gaming techniques was found to help present an advertising product as attractive as possible. It is stated that virtually all levels of language have a significant potential for implementing the functions of the language game in the advertising text. Examples of various techniques of use of the phonetic and graphic game, methods of lexical and word-building games are revealed. The game potential of grammatical tools is shown. Particular attention is paid to the handling of case-law texts as one of the most widely used methods of speech game advertising. The combination of different types of speech games has become a common phenomenon for its implementation in advertising. It is concluded that the language game allows to realize the fundamental principle of creating a bright advertising message. Use of these tools reflects one of the main trends in modern advertising language which means installation of originality, creativity, and extraordinary