Advanced Materials Research Vols. 1025-1026

Abstract: In this study, the fatigue damage progress is analyzed both theoretically and experimentally. The cyclic loading causes damage, reducing the strength until the material can no longer sustain even the service loading. The theoretical analysis is associated with the definition of the damage parameter. The detailed analysis is mainly devoted to the consideration of two structural elements, i.e. a rectangular composite plate (made of glass fibre/epoxy resin) with a centrally located circular hole subjected to cyclic tensile and a square plate (made of aramid fiber/epoxy resin) subjected to shear loading. The experiments demonstrate the scatter of results. The fuzzy set analysis has been proposed in order to estimate the uncertainty in the evaluation of critical number of cycles corresponding to the final fatigue damage..

Abstract: Fuel cells having a high energy conversion efficiency with low restriction of installation space is rising as a new eco-friendly renewable energy source. Fuel cells are largely divided into MCFC, SOFC, PEMFC, DMFC, etc. according to the type to be transferred. In this study the four fields were analyzed from a diversity aspect, a social network aspect and a distance aspect. Results showed PEMFC and MCFC to apply the most diverse technology, and catalyst technology and hydrogen fuel manufacturing areas were observed developing in all four fields. In addition, many studies were found to be commonly conducted for fuel cell vehicles in the PEMFC and SOFC fields. PEMFC is expected to have the highest effect with technology development, specifically commercialization of the Fuel Cell Vehicles through an active technology development. Development in the SOFC and MCFC fields are expected to promote home fuel cell use.

Abstract: An approach for modeling and numerical simulation of planar components using the edge line concept is developed. With this method, we develop an efficient modeling technique for microstrip discontinuities. The structure presents an arbitrary number of ports, each one with different orientation and dimensions. This article presents a hybrid method based on multimode contour integral and mode matching techniques. The process is based on segmentation and dividing the structure into key building blocks. We use the multimode contour integral method to analyze the blocks including irregular shape discontinuities. Finally, the multimode scattering matrix of the whole structure can be found by cascading the blocks. Therefore, the new method is suitable for analysis of a wide range of waveguide problems. Therefore the present approach can be applied easily to the analysis of any multiport junctions and cascade blocks. The accuracy of the method is validated comparing with results for several complex problems found in the literature. CPU times are also included showing the efficiency of the new method proposed.

Abstract: Stones are major materials for various civil engineering works and architectural construction areas and various kinds of stones are being used in construction sites and those areas are also very diverse. Even though the size of domestic stone market size is currently increasing, production volume cannot meet the demand because the production method is still highly dependent on manual work. In addition, as China is rising as the center of world stone market which emphasized the strong price competitiveness, imports from China are currently increasing because China is gradually securing the quality competitiveness as well. This seems because the quality of Chinese stones does not fall behind than the quality of domestic stones and in order to recover this situation, it is considered important to maximize the productivity of domestic stone working companies through the automation of production environment and to secure the price competitiveness through quality equalization to deal with low labor costs which China is emphasizing as their strength. Based on these reasons, this development was conducted and tried to secure the competitiveness of stone working by developing automatic control technology and stone working technology using air pressure and PLC, preventing risk factors and environmental problems caused by manual work in stone working site, removing working risk factors through automation and reducing dust and noise. And accordingly, automatic corner stone trimming working machine for boundary stones was developed, and production environments were improved and productivity could be maximized through the automation of manpower dependent works.

Abstract: This study departs from the thought that the implementation of new technology should consider the local context or the concept of “genius loci”. Based on this conception, this study is aimed to investigate whether the implementation of the current technology (here is PV technology) can be in accordance with the initial local traditional architectural form. To accommodate that objective, the roof form of the Sundanese traditional house called “Julang Ngapak”, located in West Java, was studied to analyse its particular orientation, North and South in regards to the solar incident level. The campus building of Bina Nusantara University, located in Jakarta, was selected for the study of PV roof implementation. The method of the study is simulation by applying the EnergyPlus software. There are three types of PV roof which were simulated to investigate the electricity production of the solar cell. The final deliveries of this study are to compare and to analyse the solar irradiance arrive on each type of roof and to define the most appropriate roof form in terms of orientation for implementing the BIPV concept on building particularly in Jakarta region.

Abstract: The purpose of this study was to deduce the major construction wastes to be managed using environmental impact assessment for construction wastes generated in the construction phase. To accomplish this, the amount of construction waste discharged in the construction phase was analyzed using loss rate and weight conversion factor in the Standard of Estimate for Construction Works. Based on the result of construction waste generation deduced, major construction wastes were extracted with consideration on 6 comprehensive environmental impacts including potential, abiotic depletion potential, acidification potential, eutrophication potential, ozone depletion potential, and photochemical ozone creation potential. As a result, 5 major building materials such as concrete, concrete block, rebar, cement and polystyrene panel were deduced as major cpmstruction wastes in construction phase.

Abstract: The purpose of this study is to assess greenhouse gas (GHG) emission reduction performance among certification criteria constituting “materials and resources” category, as a part of study that configures weighted values of categories for the Korea Green Building Scheme (G-SEED). For this purpose, the subjects of assessment were classified into “reference apartment house” newly constructed without application of certification criteria and “assessed apartment house” newly constructed with reflection of certification criteria. In addition, direct and indirect GHG emission reduction performance of the assessed apartment house was assessed from life cycle perspective in comparison to the reference apartment house, reflecting the purpose of assessment according to certification criteria within the “materials and resources” category. As a result, GHG emission reduction performance of “displaying carbon emission of material” and “recycling” were deduced to be extremely excellent. GHG emission reduction performance of “flexibility” and “reducing food waste” ware analyzed to be relatively satisfactory. On one hand, GHG emission reduction performance of “appropriateness of measure to reduce furniture materials” and “use of eco-friendly products” ware assessed to be relatively insufficient.

Abstract: The purpose of this study is to analyze CO₂ emission based on computation of construction waste which occurs during new constructions. To accomplish the purpose, Basic unit data of existing construction wastes was analyzed and basic unit of construction wastes generated during new constructions was proposed. In addition, basic unit of CO₂ in the disposal process of construction waste established as the national LCI DB of Korea was applied to analyze CO₂ emission during the disposal process of waste (landfill, incineration, recycling) generated during new constructions. As a result, flammable materials showed relatively high emission of 17.75kg-CO₂/kg and 2.40kg-CO₂/kg for the landfill process and recycling process, and inflammable materials had high emission of 0.74kg-CO₂/kg for the incineration process. As a result of analysis for each waste, emission was found to be in decreasing order of landfill and recycling processes for concrete, recycling, landfill and incineration processes for metals, incineration, recycling and landfill processes for wood and flammable materials, and landfill, recycling and incineration processes for inflammable materials.

Abstract: This Paper is a review within a number of the planned articles devoted to finding out and determining a range of scientific activity of the Republic of Latvia on a global scale of nanotechnologies. Purpose of the current Paper is to provide a review on the legal fundamentals in creating a local scientific environment for development of the advanced technologies in Latvia. The main methods applied by the authors are analysis of the scientific and professional literature and official documentation, and logical approach. A focus on the local documentation through integration into the European Union is accepted limitation of the Paper. The main findings ensuring the value of the Paper are: Latvia is not named among the priority regions in the newest EU’s smart specialisation platform. Despite for the nearest years the nanotechnologies are announced in the second priority for the Latvian science development, an international collaboration of Latvia is at very high rate - 70% on average and 77% of the investment volume to the scientific projects is assigned from the EU, limitations in local tooling and professionalism are obvious, it cause currently our country is still at the foundation stage.

Abstract: Compressor is the heart of refrigeration system, and the most valuable part in a refrigerator from the perspective of recycling. So the recycling progress (remanufacturing or recycling) is critical for taking full advantage of the compressors that run out of use. This paper introduces a method to decide whether to remanufacture or to recycle a compressor based on Naïve Bayes.