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Synthesis and Characterization of a Novel SCPC-CO3Ap Cement for Pulp Capping Application in Dentistry

Key engineering Materials 2017年第1期758卷 29-33页

作者： Cahyanto, Arief Rezano, Andri Zakaria, Myrna Nurlatifah El-Ghannam, Ahmed Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia Department of Anatomy Physiology and Cell Biology Faculty of Medicine Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia Department of Endodontology and Operative Dentistry Program Study of Dentistry Faculty of Medicine Universitas Jenderal Achmad Yani Jl. Terusan Jenderal Sudirman PO BOX 148 Cimahi Indonesia Department of Mechanical Engineering and Engineering Science University of North Carolina at Charlotte CharlotteNC28223 United States

Silica-calcium phosphate composite (SCPC) and carbonate apatite (CO3Ap) have several superior properties as they are bioactive, bioresorbable and elicit excellent tissue response. The CO3Ap surface layer and hydrated silica developed on the surface of the SCPC may be a key factor for achieving dentin regeneration. On the other hand, calcium hydroxide [Ca(OH)2] have antibacterial properties and biocompatible to dental tissue. Therefore, the combination of CO3Ap, SCPC, and Ca(OH)2 in a bone cement may be favorable as a pulp capping agent that enhances pulp tissue formation and dentin regeneration. The aim of the present study is to synthesize and characterize a novel SCPC-CO3Ap cement for pulp capping application in dentistry. The cement is composed of dicalcium phosphate anhydrous (DCPA), vaterite, Ca(OH)2 and SCPC. The set cement was further characterized by Fourier transform infrared (FT-IR). The microstructure of set cement was examined by scanning electron microscopy (SEM) and the mechanical strength was evaluated by diametral tensile strength (DTS). The FT-IR analyses revealed that the additional bands of carbonate were detected in each sample. The SEM samples of set cement showing more compact surface microstructure of group II compared to other groups. Furthermore, the combination of 5% SCPC and 5% Ca(OH)2 in the cement facilitated a compact structure with superior mechanical strength. The novel SCPC-CO3Ap cement has great potential to be used for pulp capping to facilitate dentin regeneration. © 2017 Trans Tech Publications, Switzerland.

关键词： Microstructure

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Sustainability Challenge of Micro Hydro Power Development in Indonesia

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IOP Conference Series: Earth and Environmental Science 2018年第1期147卷

作者： H Didik P N Bambang S Asep Y A Purwanto Study Program of Natural Resources and Environmental Management Bogor Agricultural University Indonesia Department of Mechanical and Biosystem Engineering Bogor Agricultural University Indonesia Department of Civil and Environmental Bogor Agricultural University Indonesia

Rural electrification using renewable energy is the best choice for many locations that far away from national grid. Many renewable energy project have been built for rural electrification such as micro hydro power plant (MHPP) and solar photovoltaic (SPV). Sustainability still the main challenge of off-grid renewable energy development for off-grid rural electrification in Indonesia. The objective of this paper is to review sustainability of micro hydro power development in Indonesia. The research method was done by field observation, interview with MHPP management, and reviewing some research about MHPP in Indonesia. Sustainability issues include various aspects that can be classified into 5 dimensions: technical, economic, socio-cultural, institutional, and environmental. In technical factors that lead to sustainability problem are: improper MHPP design and construction, improper operation and maintenance, availability of spare parts and expertise. In the economic dimension are generally related to: low electricity tariff and utilization of MHPP for productive use. In the social dimension are: the growth of consumer's load exceeding the capacity, reduced number of consumers, lack of external institutional support. In the institutional side, it is generally related to the ability of human resources in managing, operating and maintaining of MHPP. Environmental factors that lead the sustainability problems of MHPP are: scarcity of water discharge, conflict of water resources, land conversion over the watershed, and natural disasters.

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Using conjoint and cluster analysis in developing new product for micro, small and medium enterprises (SMEs) based on customer preferences (Case study: Lampung province’s banana chips)

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AIP Conference Proceedings 2017年第1期1867卷

作者： Wilson Kosasih Lithrone Laricha Salomon Reynaldo Hutomo 1Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia 2Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia 3Study Program of Industrial Engineering Department of Mechanical Engineering Faculty of Engineering University of Tarumanagara Jakarta Indonesia

This paper discusses the development of new products of Micro, Small and Medium Entreprises (SMEs) to identify what attributes are considered by consumers, as well as combinations of attributes that need to be analyzed into the main preferences of consumers. The purpose of this research is to increase the added value and competitiveness of SMEs through product innovation. The object of this study is banana chips produced by SMEs from the province of Lampung which it considered to be unique souvenirs of the province. The research data were collected by distributing questionnaires in Jakarta which has heterogeneous population, in order to develop banana chip’s marketing and increase its market share in Indonesia. Data processing was performed using conjoint analysis and cluster analysis. Segmentation was performed using conjoint analysis based on the importance level of attributes and part-worth of level attributes of each cluster. Finally, characteristics and consumer preferences of each cluster will be a consideration in determining the product development and marketing strategies.

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Calculation of energy consumption for sustainable machining through turning mild carbon steel

Calculation of energy consumption for sustainable machining ...

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International Conference on Mechanics,Materials and Structural engineering 2016(ICMMSE 2016)

作者： Rusdi Nur Musrady Mulyadi Asmeati Department of Mechanical Engineering State Polytechnic of Ujung Pandang Study Program of Mechanical Engineering Fajar University

Sustainable development will become importance issues for many fields, including production, industry, and manufacturing. In order to achieve sustainable development, industry should be able to perform of sustainable production processes and environmental friendly. Therefore, there is need to minimize the energy consumption(electric) in the machining process. This paper presents a calculation method of energy consumption in machining process, especially turning process which calculated by summing the number of energy consumption, such as the electric energy consumed during the machining preparation, the electrical energy during the cutting processes, and the electrical energy to produce a cutting tool. A case study was performed on dry turning of mild carbon steel using coated carbide. This approach can be used to determine the total amount of electrical energy consumed in the specific machining process. It concluded that the energy consumption will be increase for using the high cutting speed as well as for the feed rate was increase.

关键词： Calculation of energy consumption for sustainable machining through turning mild carbon steel

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Analysis of Porosity Defects in Aluminum as Part Handle Motor Vehicle Lever Processed by High-pressure Die Casting

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IOP Conference Series: Materials Science and engineering 2018年第1期367卷

作者： L. Anggraini Sugeng Faculty of Engineering President University Jalan Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia. Undergraduate Study Program of Mechanical Engineering President University Jalan Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia.

This research discusses the testing and analysis of cracking Aluminum (Al) material. Al as a handle lever was used for a braking device on a motor vehicle. Cracking of handle lever due to the part content of porosity from hydrogen gas. The existence of the H2 can be caused by the casting process and dies design that is less perfect, especially at the gate or brisket and overflow. This research is to optimize the process of making Al part handle lever, and the construction dies by following the standard. The results of these improvements were reevaluated through the chemical and mechanical testing properties stages, such as density test and tensile test on the workpiece as part handle lever. The loads on the tensile test are 25 kg and 35 kg, and the tensile test result has met the standard set by the motor vehicle company. The optimization result has the porosity defect can be reduced by 99 %. Therefore the best part handle lever can be produced.

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The Development of Bank Application for Debtors Selection by Using Naïve Bayes Classifier Technique

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IOP Conference Series: Materials Science and engineering 2018年第1期407卷

作者： S L B Ginting J Adler Y R Ginting A H Kurniadi Computer System Study Program Universitas Komputer Indonesia Jl. Dipati Ukur 112-116 Bandung 40132 Indonesia Department of Mechanical Engineering Universitas Riau Kampus Bina Widya KM 125 Simpang Baru Pekanbaru 28293 Indonesia

The purpose of this study is to create an application that functions automatically with high accuracy when analyzing bank customer data. This needed due to non-performing loans occurring frequently caused by the inaccuracy of credit analysts in the assessment of creditworthiness. This can be seen in the incident occurred in a public bank located in Bandung. This bank does not have the database that serves to accommodate data history and the method used in assessing creditworthiness is merely based on the simple statistical analysis. This leads to reduced accuracy and speed in the decision-making process. This research applies Naïve Bayes Classifier (NBC) method, a Data Mining technique. This helps credit analysts to select customers who are truly eligible to be given credit so that non-performing loan can be avoided. NBC calculates the probability of one class from each group of attributes and determines which class is most optimal. The accuracy of the NBC sampling test from 500 data is 95% compared to the decision made by a credit analyst. It can be concluded that this application is very helpful for credit analysts in recommending customers who are eligible for a loan to the bank's decision maker.

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Promoting global education in science and engineering: An experience in Indonesian high schools

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Journal of Physics: Conference Series 2019年第1期1175卷

作者： F Triawan M K Biddinika S Hanaoka F Takahashi M Aziz Mechanical Engineering Study Program Sampoerna University Jl. Raya Pasar Minggu Kav 16 Jakarta Selatan 12780 Indonesia Department of Transdisciplinary Science and Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro Tokyo 152-8550 Japan School of Environment and Society Tokyo Institute of Technology 4259 Nagatsuta Midori Yokohama 226-8503 Japan Center for Waste Management and Bioenergy Universitas Janabadra Jl. Tentara Rakyat Mataram 58 Bumijo Jetis Yogyakarta 55231 Indonesia Institute of Innovative Research Tokyo Institute of Technology 2-12-1 Ookayama Meguro Tokyo 152-8550 Japan

Japan has initiated higher education reform in which internationalization is one of the challenges as a way to improve excellence in research and competitiveness within Asia and the world. In becoming the 'Asian Gateway' to the rest of the world, Japan also invites students from Asian countries to pursue higher education in Japan. However, language problem is often considered as one of the barriers faced by international students – not only from Asian countries – in Japan, especially for undergraduate program since the program is mostly held in Japanese language. The Global Scientists and Engineers program (GSEP) is the international bachelor of engineering degree program in Tokyo Institute of Technology (Tokyo Tech). It does not require any Japanese language ability since the whole program would be taught in English. This paper presents the experience of promotional activities of the program in Indonesia in order to identify the challenges, to document the method, and to outline some recommendations for improvement. The promotion was held by presentation in front of 13 (thirteen) high schools in Jakarta and nearby. After the promotional presentation, participants were also requested to express their interest in applying the program as well as their perceived usefulness of the presentation.

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Compact localized states and flat-band generators in one dimension

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Physical Review B 2017年第11期95卷 115135-115135页

作者： Wulayimu Maimaiti Alexei Andreanov Hee Chul Park Oleg Gendelman Sergej Flach Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34051 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea Faculty of Mechanical Engineering Technion Haifa 3200003 Israel New Zealand Institute for Advanced Study Center for Theoretical Chemistry & Physics Massey University Auckland 0745 New Zealand

Flat bands (FB) are strictly dispersionless bands in the Bloch spectrum of a periodic lattice Hamiltonian, recently observed in a variety of photonic and dissipative condensate networks. FB Hamiltonians are fine-tuned networks, still lacking a comprehensive generating principle. We introduce a FB generator based on local network properties. We classify FB networks through the properties of compact localized states (CLS) which are exact FB eigenstates and occupy U unit cells. We obtain the complete two-parameter FB family of two-band d=1 networks with nearest unit cell interaction and U=2. We discover a novel high symmetry sawtooth chain with identical hoppings in a transverse dc field, easily accessible in experiments. Our results pave the way towards a complete description of FBs in networks with more bands and in higher dimensions.

关键词： Electronic structure 1-dimensional systems Electron-correlation calculations Lattice models in condensed matter

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Heuristic regression method for descriptive data analysis 16

Heuristic regression method for descriptive data analysis

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16th International Conference on Environment and Electrical engineering, EEEIC 2016

作者： Gomes, Flavio A. Gomes, Viviane M. Assis, Alfredo De O. Reis, Marcio R. Da C. Da Cruz, Gelson Calixto, Wesley P. Electrical Mechanical and Computer Engineering School University of Goias Brazil Experimental and Technological Research and Study Group Federal Institute of Goias Brazil Program in Electronic Systems and Automation University of Brasilia Brazil

ISBN: (纸本)9781509023196

The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Three case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced. © 2016 IEEE.

关键词： Heuristic methods

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Casting and Welding of Aluminium Matrix Composite Materials Reinforced by SiC Particles

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IOP Conference Series: Materials Science and engineering 2018年第1期434卷

作者： P H Tjahjanti F Hermansyah L H Prasetya M P T Sulistyanto Department of Mechanical Engineering Universitas Muhammadiyah Sidoarjo Kampus 2 Jalan Raya Gelam nomer 250 Candi Sidoarjo Jawa Timur Indonesia Informatics Study Program Universitas Kanjuruan Malang Jalan S. Supriadi no.48 Malang Jawa Timur Indonesia

Aluminium casting is often done, but for the casting of composite materials base on aluminium is very rare. The purpose of this research is make composite material based on aluminium reinforced by SiC particles by casting. This research method use three different casting molds that are permanent cast, ceramic (chamotte sand / Al2O3-SiO2) molds and sand molds. The best casting product that has a small porosity is the AlMg10Si make of permanent molding. The small porosity effect causes the AlMg10Si material to become harder. The oxy-acetylene welding results show that the AlMg10Si + composite material reinforced by 15% SiC particles, has a fine discontinuity when the liquid penetrant test, which means that very small cracks occur, and potholes result from casting. This composite material has enormous energy to break is 0.94 Joule at impact test.

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