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Mechanical Properties, Morphology and Thermal Degradation of PCL (Poly ε - Caprolactone) Biodegradable Polymer Blended Nanocomposites with Aceh Bentonite as Filler

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IOP Conference Series: Materials science and engineering 2019年第1期536卷

作者： Ridwan Basuki Wirjosentono Tamrin Teuku Rihayat Doctoral program of Chemistry Faculty of Mathematics and Natural ScienceUniversitas Sumatera Utara. Departement of Chemical Engineering Politeknik Negeri Lhokseumawe Departement of Chemistry Universitas Sumatera Utara

Polycaprolactone (PCL) is an important polymer due to its mechanical properties, miscibility with a large range of other polymers and biodegradability. Polycaprolactone (PCL) was chosen as the matrix because of its biodegradability characteristics. This paper reports on an investigation of the influence of the presence of bentonite. It was found that of bentonite significantly influenced the mass loss behavior of the nanocomposite because of physical interactions between the clay and the polymer chains and degradation volatiles. Melt drawing of the composite, however, had little influence on the degradation behavior of the investigated samples. Based on mechanical properties results, addition of bentonite significantly enhances the flexibility of PCL blends. TGA showed that the presence of bentonite improves thermal stability of blends.

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The investigation of influence ammonia concentration variations to the performance of a pump less ammonia-water absorption refrigeration system with water flooding evaporator

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AIP Conference Proceedings 2019年第1期2062卷

作者： Hendra Wijaksana I. N. S. Winaya Made Sucipta Ainul. Ghurri 1)Doctoral Study Program in Engineering Science Udayana University Kampus Jendral Sudriran Denpasar Bali-Indonesia 2)Mechanical Engineering Department Engineering Faculty Udayana University Kampus Bukit Jimbaran Denpasar Bali-Indonesia

An experimental investigation of the influences ammonia concentration variation to the performances of pump less ammonia-aqua absorption refrigeration system with water flooding evaporator is described. The heat generated in generator and refrigerating effect in evaporator, cooling capacity, coefficients of performance (COP) are investigated. The objective of this study is to investigate the characteristic and influences of the ammonia concentration variation to the performance of pump less absorption refrigeration system with water flooding evaporator as a refrigeration load.. In this research, the generator temperature has been setting constant in 80°C using electric heater, the ammonia concentration in 500 ml solution would be varied in 18%, 27%, 37%, 47%, and 59%. It is concluded that heat generated in generator and refrigerating effect in evaporator decrease with increasing ammonia concentration, while the cooling capacity and COP would increase with increasing ammonia concentration. As a result, it is found that increasing the ammonia concentration would effect on increasing of cooling capacity and COP. The highest the ammonia concentration, the highest cooling capacity and COP would be resulted. The highest cooling capacity and COP resulted respectively are 0.7180 kW and 0.829 at 59% ammonia concentration.

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Mangrove Conservation Opportunity at Southern Coast of Bangkalan-East Java, Indonesia

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IOP Conference Series: Earth and Environmental science 2020年第1期557卷

作者： M K Wardhani D M Rosyid H D Armono Doctoral Program Department of Ocean Engineering Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia Department of Marine Science Faculty of Agriculture Trunojoyo University Madura Raya Telang PO BOX 2 Kamal Bangkalan 69162 Indonesia Department of of Ocean Engineering Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia

Mangrove ecosystems are resources of landscapes, flora, fauna, and local communities that interact with each other. Mangrove ecosystems have important ecological, economic and social functions for coastal development. Conservation is a means of involving the community in mangrove recovery and management activities as a preservation effort. This paper examines the potential of mangrove ecosystems in the southern coast of Bangkalan as a conservation area. The fact, mangrove ecosystems have a pressure that decreased area significantly. Data collection used the quadratic transect method and satellite image analysis. Mangroves on the southern coast of Bangkalan have increased area over the past 10 years. Mangrove vegetation found consisted of 4 families and 8 species. There are also found fauna i.e. insects, snakes, primates and birds. The observations indicated that conservation of mangrove forests on the southern coast of Bangkalan needs to be done. This effort can be supported by ecotourism activities which are expected to improve the community welfare.

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Indoor Air Pollution in Non Ac Passenger Bus 2

Indoor Air Pollution in Non Ac Passenger Bus

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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Husna, Iksiroh El Yan El Rizal Unzilatirrizqi, D. Karyanto, Yudi Sunoko, Henna R. Doctoral Program of Environmental Science School of Post. Stu. Diponegoro University Semarang Indonesia Nautical Departement Merchant Marine Polytechnic Semarang Jingosari 2A Semarang Indonesia Automotive Engineering Polytecnic of Ro. Safety Transport Jl. Semeru No. 3 Tegal50125 Indonesia Faculty of Medicine Diponegoro University Jl. Prof Sudharto SH Semarang5027 Indonesia

Passenger buses have been one of favorite means of transportation in Indonesia due to its affordability and flexibility. Intensity of human activities during the trip in the buses have a potential of causing indoor air pollution (polusi udara dalam ruang;PUDR). The indoor air pollution has an impact of 1000-time bigger than outdoor air pollution (polusi udara luar ruang;PULR) on lung. This study aimed to find out indoor air pollution rate of non air conditioned buses using an approach to biological agent pollutant source. The study applied an analysis restricted to microorganisms persistence as one of the sources of the indoor air pollution. The media were placed in different parts of the non AC buses. This study revealed that fungs were found in the non AC buses. They became contaminants and developed pathogenic bacteria that caused air pollution. © 2018 The Authors, published by EDP sciences.

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Enhancing the yield and quality of Kemiri Sunan crude oil by preliminary extraction of feedstock

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Journal of Physics: Conference Series 2019年第1期1295卷

作者： S Supriyadi P Purwanto P H Hermawan Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang- Indonesia Department of Mechanical Engineering Universitas PGRI Semarang Semarang- Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang – Indonesia

Biodiesel is an alternative fuel produced by chemical reaction between vegetable oil or animal fat with alcohol and catalyst. The preliminary treatment in extraction of biodiesel feedstock is an important process to obtain maximum yield of crude oil. This study aims to find optimal preliminary treatment on extraction of Kemiri Sunan seed in order to produce crude oil with maximum yield and quality. The research investigated the effects of screw press machine rotation and duration of steaming process. Three levels of duration of steaming used were 30, 60 and 90 minutes. Observations of crude oil yield, moisture content, free fatty acid content, kinematic viscosity, density and color were done. The result suggested that the rotation of screw press machine affected the crude oil yield. The duration of steaming process affected the oil yield, free fatty acid content, kinematic viscosity, density and color. The best oil yield result of 70.3% was obtained from the combination of heating duration of 60' and screw rotation of 25 RPM.

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The analysis of thermal performance of vernacular building envelopes in tropical high lands using Ecotect

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IOP Conference Series: Earth and Environmental science 2020年第1期423卷

作者： Hermawan Sunaryo A Kholil Department of Architecture Qur'anic Science University Jl. Hasyim Asy'ari Km.03 Wonosobo 56351 Indonesia Doctoral Program in Architecture Diponegoro University Jl. Prof Sudarto Semarang 50275 Indonesia Department of Mechanical Engineering Qur'anic Science University Jl. Hasyim Asy'ari Km.03 Wonosobo 56351 Indonesia Department of Post Graduate Qur'anic Science University Jl. Hasyim Asy'ari Km.03 Wonosobo 56351 Indonesia

Climate change affects all areas, including those with low temperature. Wonosobo belongs to highland areas with low temperature. The thermal performance of buildings is influenced by micro-environment climate so that the climate change will affect the thermal performance of buildings. Vernacular buildings are believed to be able to make the occupants comfortable. The vernacular buildings in tropical highlands have either exposed stone walls or wooden walls. The present research seeks to analyze the thermal performance of building envelopes with wooden walls and exposed stone walls in highland areas. Simulation method using the Ecotect software was applied. There are 12 building models with a variety of roofing and flooring were selected. The results of the simulation indicate that the difference between indoor and outdoor temperatures of one model and other models is not significant. Warm temperature mostly occurs in houses with exposed stone walls. Highland areas need much warmth so that cold temperature will not disturb occupants.

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Digital Dictionary Using Binary Search Algorithm

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Journal of Physics: Conference Series 2019年第1期1255卷

作者： Riski Muhamad Fitrian Insan Taufik Muhammad Sabir Ramadhan Neni Mulyani Jeperson Hutahaean Arjon Samuel Sitio Hengki Tamando Sihotang Teknik Informatika STMIK Pelita Nusantara Medan Sumatera Utara Indonesia Doctoral Program Vocational Technology Education Postgraduate Engineering Faculty Padang State University Padang West Sumatera Indonesia Sistem Informasi STMIK Royal Kisaran Sumatera Utara Indonesia Doctoral Program Faculty of Computer Science and Information Technology Universitas Sumatera Utara Medan-Indonesia

Digital Dictionary of Computer and Network engineering can be used in the learning process of computer and nerwork enginering students. Dictionaries are generally book-shaped is hard to carry because of their thick and heavy, now can be accessed anywhere by development of web technology. Digital dictionaries can be accessed through computers, laptops dan cellphones, this is make student easily in learning process. The digital dictionary can not only be used by students of computer and network engineering, but can also by general public, as long as you have an internet connection, anyone can be use this digital dictionaries. The main process in this digital dictionary is the search process. Binary search algorithm used in the search process of binary search algoritm. Binary search algoritm search is applied to word search in this digital dictionary, because this algoritm is intended for sequintal data. program language that will be used to build this digital dictionary is PHP and MySQL.

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Optimization of hybrid PVA/hFDM scaffold preparation

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AIP Conference Proceedings 2021年第1期2344卷

作者： Rizqa Inayati Muhammad Suhaeri Nuzli Fahdia Melinda Remelia Radiana Dhewayani Antarianto 1Master Program in Biomedical Science Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia 2Rumah Sakit Universitas Indonesia Kampus Universitas Indonesia Depok West Java 16424 Indonesia 3Stem cell and Tissue Engineering Research Cluster Indonesian Medical Education and Research Institute (IMERI) Universitas Indonesia Salemba Raya Jakarta West Java 10430 Indonesia 4Doctoral Program in Biomedical Science Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia 5Department of Basic Biomedicine Faculty of Medicine Universitas Kristen Indonesia Jl Mayjen Sutoyo No 2 DKI Jakarta 13630 Indonesia 6Department of Histology Faculty of Medicine Universitas Indonesia Jl. Salemba Raya No. 6 Central Jakarta DKI Jakarta 10430 Indonesia

Osteogenic differentiation from Mesenchymal Stem Cell (MSC) to osteoblast has a clinical significance which is very important for treating bone injuries, in the form of femoral fractures with the most cases in Indonesia. Various studies have been conducted to find the best scaffold that can improve osteogenic differentiation, one of which is the development of a hybrid scaffold made from natural biomaterials in the form of the extracellular matrix, and from synthetic biomaterials. The discovery of the best scaffold is not only focused on the source of the scaffold but also requires optimization of the method in making the scaffold. Therefore, the aim of this study is to find out the optimum method for making hybrid scaffolds that support osteogenic differentiation from MSC. Materials and methods: human Fibroblast-derived Matrix (hFDM) as a hybrid scaffold material collected from decellularized fibroblasts cultures from post-cleft-surgery reconstruction palatal skin. Fibroblast cell cultures were divided into two groups of cultures, cultures without Platelet Rich Plasma (PRP), and cultures with the addition of PRP. For decellularization, we performed optimization at the preparation stage of the decellularization solution, and the time of culture for decellularization. In the preparation of the decellularization solution, we divided it into two groups, NH4OH as material from the decellularization solution was diluted with PBS before mixing with 0.25% Triton X-100, and NH4OH was diluted directly in 0.25% Triton X-100. In optimizing the culture time for decellularization, we divided it into three groups, decellularization on the day when cell growth reached 100% confluent, decellularization on the 3rd day after 100% confluent (H + 3) cells, and decellularization on the 4th day after 100% confluent (H + 4) cells. Next, the hFDM matrix is collected and added Polyvinyl Alcohol (PVA) solutions to form a hybrid PVA / hFDM scaffold in the form of a hydrogel. Observations on h

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Activated carbon characteristics of tabah bamboo that physically activated under different activation time

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IOP Conference Series: Materials science and engineering 2019年第1期539卷

作者： D N K P Negara T G T Nindhia I W Surata M Sucipta F Hidajat Doctoral Study Program of Engineering Science Faculty of Engineering Udayana University Kampus Sudirman Denpasar-Bali Indonesia Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Badung Bali Indonesia PPPTMGB 'Lemigas' Jl. Ciledug Raya Kav. 109 Jakarta Selatan 12230

Activated carbon is a versatile porous material that widely applied to purify, deodorize, decolorize, remove or reduce some gases harmful constituents and storage of gas. For different application different characteristics of activated carbon is required. This paper concerns to find out the characteristics of activated carbons derived from tabah bamboo (Gigantochloc nigrociliata) that physically activated with different activation holding time. Prepared tabah bamboo was carbonized by heating up to the temperature of 800 °C for two hours. The char produced was powdered and then activated physically by heating up to 800 °C, soaked at that temperature during each 1, 1.5 and 2 hours under 100 mL/min N2 flow. Activated carbons manufactured were characterized by proximate and ultimate analyses and SEM observation. The results show that the highest fix carbon (82.52%) and lowest ash (5.91 %) was obtained at 1 hour soaking time with moisture and volatile contents were 3.56% and 8.00 % respectively; the highest carbon (C) content of 84.16 % was yielded at soaked time of 1.5 hours; SEM observation shows that there were significant differences of morphology structure between raw material and activated carbons for all of the soaking time variations. The pores structures have been formed in the activated carbons produced.

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Implementation of Apriori Algorithm for Analysis of Consumer Purchase Patterns

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Journal of Physics: Conference Series 2019年第1期1255卷

作者： Suprianto Panjaitan Sulindawaty Muhammad Amin Sri Lindawati Ronal Watrianthos Hengki Tamando Sihotang Bosker Sinaga Teknik Informatika STMIK Pelita Nusantara Medan Sumatera Utara Indonesia Doctoral Program Faculty of Computer Science and Information Technology Universitas Sumatera Utara Medan-Indonesia Program Doctoral Vocational Technology Education Postgraduate Engineering Faculty Padang State University Padang West Sumatera-Indonesia Manajemen Informatika AMIK Logika Sumatera Utara Indonesia Manajemen Informatika AMIK Labuhan Batu Sumatera Utara indonesia

Consumer purchasing patterns are a form of purchases made by consumers, whether someone or a lot of people to get the desired item by making a purchase transaction. One characteristic of the purchase pattern is the existence of acquiring something through exchanging money. This study aims to create an application that is used in determining consumer purchasing patterns by applying a priori algorithms and using Visual Basic 2010 as a tool for determining consumer purchase patterns. This application uses a priori algorithm calculation method where the sample consumer purchase data will be sorted and calculated by providing the value of the minium support and configuration parameters and based on the results of confidence the largest number of conclusions such as: can be used as information for determining sales, the application of a priori algorithms can provide information pattern combination item set from consumer purchase data that is with support above 15% and confidence above 50% on item set.

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