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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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The Effect of Aloe vera Extract Variation in Electrospun Polyvinyl Alcohol (PVA)-Aloe vera-Based Nanofiber Membrane

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Journal of Physics: Conference Series 2018年第1期1120卷

作者： D Hikmawati A R Rohmadanik A P Putra Siswanto Aminatun Physics Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya 61110 Indonesia Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya 61110 Indonesia

Electrospinning technique is a method to produce nanofiber with high potential difference. Several main parameters in the electrospinning process are solution parameter, such as viscosity, surface tension and conductivity. Those parameters affect the morphology of nanofiber membrane produced by the electrospinning process. This study used 10% PVA in aquadest with several Aloe vera concentration (0, 2.5, 5, 7.5 and 10 % w/v). The viscosity of the solution increased when the concentration of the Aloe vera increased. SEM image of the nanofiber membrane showed that the diameter of the nanofiber increased with the increase of the Aloe vera concentration, with the highest diameter of 379.80 nm on the membrane with Aloe vera concentration of 10% w/v. The result of DSC test showed that there were shifts on the glass transition (Tg) and melting point (Tm) value along with the addition of Aloe vera in the PVA solution. This results was also emphasized with the result of FTIR test which showed the shift on the wavenumber absorbance due to the crosslinking between PVA and Aloe vera. The degradation test indicated that the presence of crosslinking could maintain the nanofiber structure, thus the membrane was not easily degraded.

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Initial sustainability assessment of tapioca starch production system in Lake Toba area

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IOP Conference Series: Materials Science and engineering 2018年第1期337卷

作者： Asido Situmorang Yosef Manik Engineering Management Study Program Faculty of Industrial Technology Institut Teknologi Del Laguboti 22381 North Sumatera Indonesia

This study aims to explore to what extent the principles of sustainability have been applied in a tapioca industry located in Lake Toba area and to explore the aspects that open the opportunities for system improvement. In conducting such assessment, we adopted the life-cycle approach using Mass Flow Analysis methods that covers all cassava starch production processes from fresh cassava root till dry cassava starch. The inventory data were collected from the company, in the form of both production record and interviews. From data analysis the authors were able to present a linked flow that describes the production process of tapioca starch that quantifies into the functional unit of one pack marketable tapioca starch weighs 50 kg. In order to produce 50 kg of tapioca, 200 kg cassava root and 800 kg of water are required. This production efficiency translates to 25% yield. This system generates 40 kg of cassava peel, 60 kg of pulp and 850 kg of waste water. For starch drying 208.8 MJ of thermal energy is required in the form of heating fuel. The material flow analysis is employed for impact assessment. Several options in improving the operation are proposed includes utilization of pulp into more valuable co-products, integration of waste treatment plant to enable the use of water recycled from the extraction operation for the washing process, and to application of a waste water treatment system that produces biogas as a renewable energy, which reduces the consumption of fuel in dryer unit.

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Inclusive business model in tapioca starch industry in Lake Toba area: a case study

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IOP Conference Series: Materials Science and engineering 2018年第1期337卷

作者： S Tampubolon Y Manik Engineering Management Study Program Faculty of Industrial Technology Institut Teknologi Del Laguboti 22381 North Sumatera Indonesia

The notion of inclusive business calls for additional focus and innovation in the way companies do business which seeks to contribute to poverty alleviation by including Bottom of the Pyramids (BoP) communities within its value chain while not losing sight of the ultimate goal of business. Lake Toba Area has potentials in providing chances for doing businesses. On the other hand, the growth of market size is rather slow and demographically still dominated by BoP. This is a case study which seeks to investigate to what extent the Inclusive Business Model (IBM) is adopted in the strategic planning and applied in the operational management of companies that operate in Lake Toba Area. The study was conducted in qualitative basis. The observation was conducted by gathering data and information through a series of interviews with the top management and desk study of the business plan in a tapioca starch industry in Toba Samosir Regency. The collected data and information were then analyzed qualitatively by comparing them with criteria and parameters of IBM suggested in a vast body of literature. The reference by which the IBM is referred in this study is a series of criteria which is synthesized from a literature review on a vast body of literature about IBM. From data analysis, it is evident that IBM has been incorporated in the strategic plan and applied in the operational activities of the object of this study. However, we also found some rooms for improvement such as expanding the involvement of BoP in their value chain as consumers, by which some innovation in the product diversification is required.

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Analysis backpropagation methods with neural network for prediction of children's ability in psychomotoric

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Journal of Physics: Conference Series 2018年第1期978卷 012085-012085页

作者： Izhari, F Dhany, H W Zarlis, M Sutarman Informatics Engineering Study Program Master Faculty of Computer Science and Information Technology Universitas Sumatera Utara Medan Indonesia

A good age in optimizing aspects of development is at the age of 4-6 years, namely with psychomotor development. Psychomotor is broader, more difficult to monitor but has a meaningful value for the child's life because it directly affects his behavior and deeds. Therefore, there is a problem to predict the child's ability level based on psychomotor. This analysis uses backpropagation method analysis with artificial neural network to predict the ability of the child on the psychomotor aspect by generating predictions of the child's ability on psychomotor and testing there is a mean squared error (MSE) value at the end of the training of 0.001. There are 30% of children aged 4-6 years have a good level of psychomotor ability, excellent, less good, and good enough.

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Increasing students’ problem-solving ability on the pressure concept through model-eliciting activities (MEAs)

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AIP Conference Proceedings 2019年第1期2202卷

作者： Ana Yuniasti Retno Wulandari Ninik Agustina Yunin Hidayati Fatanur Baity Tsulutsya 1Natural Science Education Study Program of Trunojoyo University Jl. Raya Telang PO BOX 2 Kamal Bangkalan 69162 Indonesia 2Engineering Faculty of Trunojoyo University Jl. Raya Telang PO BOX 2 Kamal Bangkalan 69162 Indonesia

Learning in the 21st century is directed at High Order Thinking Skills, one of which is problem-solving. Students still have difficulty understanding and solving problems. Model-Eliciting Activities (MEAs) is a model that helps solve problems with structured and systematic modeling. This research aims to determine whether there are a difference and the magnitude of the increase in students’ problem-solving ability before and after the implementation of MEAs learning on the pressure concept. This research was conducted at SMPN 1 Kamal. The research sample is 32 students of class VIII E. The instrument for collecting data uses an essay test based on Polya’s problem-solving steps. The data analysis technique used paired sample T-test with SPSS 20 software to determine whether there is a difference in students’ problem-solving ability and the N-gain score test to measure the magnitude of improvement in students’ problem-solving ability. Based on the results of data analysis using paired sample T-test obtained a significance value of 0.000 and a value of T count 11.555 with T table 2.040. From these results, it is known that the null hypothesis is rejected. While the results of the N-gain score obtained a value of 0.44 with a medium category. The results of this research can be concluded that there is a difference in students’ problem-solving ability before and after the implementation of MEAs learning on the pressure concept and improvement of students’ problem-solving ability with the medium category. So, MEAs learning is able to train and help students to understand and solve problems in the pressure concept.

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Land-use and road development pattern of downtown makassar since 19th century until now

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Lowland Technology International 2017年第2期19卷 135-144页

作者： Akil, A. Urban and Regional Planning Study Program Engineering Faculty Hasanuddin University Kampus Unhas Tamalanrea Jalan Perintis Kemerdekaan KM 10 Makassar90245 Indonesia

The study aims to determine the development of land use and road patterns in downtown Makassar since 19th century and its influencing factors. The study intends to provide an understanding of the growth and development direction of the city based on the history, to figure out the factors which later can be used as a basis of coastal city planning policy. The collection of information obtained by observation, in-depth interviews, and referring to the city development history. The data were analyzed using GIS-based spatial technique and qualitative analysis to determine factors that affect urban development. The study found that land uses such as residential, trade/services, port, and social facilities have been developing dynamically in the downtown Makassar until nowadays. These phenomenon lead to subsiding or disappearance of other land uses such as paddy fields, township, gardens, open spaces, grave, and jail. The development ware strongly influenced by the dynamics of economic development, science, and urban technology, especially on trade and settlement facilities. The direction of urban development is dominant to the East and South due to the availability of vacant land and access to hinterland. Similarly, the development of roads in the downtown area also occurs dynamically as the loss of some roads as a result of infrastructure and housing construction. It is strongly associated with urban urbanization process due to the modernization. Facing that, it is necessary to maintain urban heritage strategy among others: actualization of local wisdom and heritage, involving each ethnic in development, revitalizing area based on history and culture, and area management.

关键词： Land use

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The feasibility of BRT corridor VI shelters in Semarang City

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AIP Conference Proceedings 2018年第1期1941卷

作者： Andi Purnomo Moch Fathoni Setiawan Architecture Study Program Civil Engineering Department Engineering Faculty Semarang State University Gedung E12 Kampus UNNES Sekaran Gunungpati Semarang 50229 Indonesia

Like other big cities in Indonesia, Semarang City as the capital of Central Java Province also has various city problems, one of them is the transportation problem. Transportation problems arise due to increased mobility of society that is not in balanced with the public transportation facilities and infrastructure availability. In order to create a better transportation system, the local government of Semarang City held Trans Semarang bus rapid transit (BRT) which began operating in 2010. This study aims to analyze the feasibility of BRT Trans Semarang corridor VI shelters. This research uses descriptive critique technique. The results are expected to be considered in determining the right policy in creating a better transportation system. Based on observations made, the majority of BRT Trans Semarang corridor VI uses non-permanent shelters and is less feasible to be a BRT shelter. Thus, the local government is expected to improve the feasibility of BRT Trans Semarang shelter so that the sense of security and comfort can be obtained by users of BRT. In addition, the local government is also expected to maintain the quality of services provided. These services include ticket service, the condition of buses, speed and waiting time, as well as the placement and condition of shelters.

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Physical and chemical properties of corn, cassava, and potato starchs

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IOP Conference Series: Earth and Environmental Science 2018年第1期160卷

作者： A H D Abdullah S Chalimah I Primadona M H G Hanantyo Research Unit for Clean Technology Indonesian Institute of Sciences Bandung Indonesia Program Study of Material Engineering Faculty of Mechanical and Aeronautical Engineering Institute Technology of Bandung Bandung Indonesia

Starch-based plastic is developed for petroleum-based plastic material replacement. Thus, basic knowledge of starch properties is important. This research aimed to evaluate the physical and thermal properties of various potential starch, i.e. corn, cassava, and potato starch. Granule size, thermal property, and functional group of starch were determined by optical microsopy, DSC, and FTIR, respectively. Our results demonstrated that the properties of starch (e.g. granule morphology and thermal property) varied according to its different sources. Potato starch has a bigger granule size and lower gelatinization temperature compare to corn and cassava starch. This implied that the granule size of starch affected gelatinization temperature. The larger the granule size, the more easily the starch to be gelatinized.

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Vertical Greenery System as the Passive Design Strategy for Mitigating Urban Heat Island in Tropical Area: A Comparative Field Measurement Between Green Facade and Green Wall

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IOP Conference Series: Earth and Environmental Science 2018年第1期213卷

作者： Ratih Widiastuti Chely N. Bramiana I.R.H Bangun Bintang N. Prabowo Mirza Ramandhika Architectural Study Program Vocational School Diponegoro University Semarang Indonesia Department of Architecture Faculty of Engineering Diponegoro University Semarang Indonesia

During the last decade, greenery aspect in the building envelope starts to increase their presence in the building design. Vertical greenery system became the one of alternatives that potential to energy-saving in the building. However, in tropical area, researches related to vertical greenery system are enigmatic since reducing heat in tropical area are crutial for maintaining space in comfort condition. In this study, a comparative thermal analysis between green facade and green wall will present. A model called house miniature set up with climbing plans as model of green facade. While for green wall, data measurement was conducted in the office building with green wall as building envelope. The results showed a high potential for energy savings during peak time in the afternoon for green wall (1.5%) and green facade (1.3%) in comparison to the bare wall. While for interior facade are 2.6% for green wall and 2.2% for green facade. Effect of vertical greenery also found in the outdoor air temperature around greenery system. Results show at the hottest time of the day, the green wall and green facade reduced outdoor temperatures by 3.0°C and 1.2°C, respectively. Based on the analysis, compared to green facade, the cooling effect produced by green wall is faster. Possibility, the substrate properties in the green wall also help to decrease temperature. The reduction can be due to the foliage density as the leaves of green wall is denser than leaves in green facade.

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