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Hernawan,Rifki Septawendar,Naili Sofiyaningsih,Suhanda Sutardi 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.5
Nano-ZrO2 was succesfully prepared by calcining a precursor of a zirconium gel-emulsion in oleic acid. The gel-emulsion process was started with the preparation of a gel zirconium hydroxide. The hydroxide gel was then mixed with oleic acid at various ratios and heated at 200 oC to give zirconia precursors. These precursors were succesfully calcined at 800 oC, 1000 oC,and 1200 oC, to give zirconia powder. The crystal structure and the particle morphology of the calcined powder were identified using XRD, SEM, and TEM. The XRD results show that monoclinic zirconia is formed dominantly with crystallite sizes ranging from 46.2 to 55.3 nm at 800 oC. Meanwhile, the SEM micrographs of the zirconia calcined at 800 oC show particles with a homogenous morphology having sizes below 100 nm. The TEM results indicate that that the individual grain diameters of ZrO2 were less than 60 nm. A lower oleic acid concentration leads to a more alkaline condition and more monoclinic zirconia formed; and a higher calcination temperature leads to a larger size of crystallites.
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Dede Taufik,Mikrajuddin Abdullah,Hernawan,Suhanda Sutardi,Rifki Septawendar 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
Nanocrystallines of calcia-stabilized zirconia are known to reveal excellent mechanical and high ionic conductivity propertieswhose depend on the calcia concentration. In this work, nanocrystallines of calcia-stabilized zirconia were synthesized fromzircon precursor and 7.5 weight % CaO at 1000 oC, 1200 oC, and 1400 oC. Phase transformation and microstructure evolutionwere investigated by an X-ray diffraction and a scanning electron microscopy. Another un-doped zirconia was also synthesizedfrom the local zircon by following the same procedure for comparison. A fully cubic form of the calcia-stabilized zirconia andcalcium zirconate were obtained at 1200°C having the crystallite sizes ranging from 55 to 87 nm and remained stable at1400 oC. Meanwhile, un-doped zirconia consisted of pure the monoclinic zirconia at 1200 oC and 1400 oC. High agglomerationis found in the calcia-stabilized zirconia particles at 1000 oC, whereas grain boundaries and interconnect are observed at1400 oC. The cubic crystal of zirconia has specific and different finger print characteristics in the infra-red spectrum comparedto the monoclinic zirconia.
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Suharto Abdul Majid,Prasadja Ricardianto,Yosi Pahala,Euis Saribanon,Sonya Sidjabat,Mochamad Arif Hernawan,Abdullah Ade Suryobuwono,Ryan Firdiansyah Suryawan 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.2
Customers are now constantly linked and communicate extensively with each other utilizing technology-enabled media, such as online social networks. Therefore, when making buying decisions, customers are often subjected to social influence. The strategic orientation to face the crisis due to the pandemic is not enough to rely solely on market capabilities and dynamics driven by incentives from the government. The advantages that are built on values that become market attractiveness need to be explored so that they become the basis for developing concepts that serve as frameworks for solving problems. The purpose of this study is to calculate customer lifetime value (CLV) in a space such as Marketplace (with the presence of buyers and sellers) considering network relations and the communication that takes place between them. These communications are in the form of interactions between buyers and buyers (verbal advertising), buyers and sellers (each number affects the other) and sellers with sellers (verbal advertising). In addition to calculating CLV in this study, optimal marketing strategies (for buyers) and pricing (for suppliers) are determined. In fact, this research primarily aims to determine the optimal marketing and pricing strategies in order to maximize the profit and CLV of the customers over time. For modeling, an optimal control model is suggested and finally a numerical example and sensitive analysis are provided to demonstrate the proposed model. The research objective is to analyze the attractiveness and market-based strategies to increase competitiveness in the aviation industry. Descriptive research verification survey of 32 airlines with the observation unit leaders and employees and customers. Data analysis used variant-based structural equations (Structural Equation Modeling - SEM). The results show that market attractiveness remains a value for customers to be man-aged by the company. The implementation of company strategy with customer focus, competitor intelligence, cross-functional intelligence, and performance implications encourages the excellence of the company's position in terms of both price and quality, including innovation in providing services to customers
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Assessing Carbon Stock and Sequestration of the Tropical Seagrass Meadows in Indonesia
A’an J. Wahyudi,Susi Rahmawati,Andri Irawan,Hadiyanto Hadiyanto,Bayu Prayudha,Muhammad Hafizt,Afdal Afdal,Novi S. Adi,Agustin Rustam,Udhi. E. Hernawan,Yusmiana P. Rahayu,Marindah Y. Iswari,Indarto H. 한국해양과학기술원 2020 Ocean science journal Vol.55 No.1
Seagrass meadows provide critical ecosystem services for coastal areas, e.g., as nursery habitats for various fish species, help with water filtration of suspended sediment, and provide food for dugongs (Dugong dugon). Their role as “blue carbon” and their capacity to mitigate climate change, by means of Natural mechanism of Carbon Dioxide Removal (NCDR) from the atmosphere, has recently gained increased attention. However, available scientific methods such as guidelines and manuals to measure carbon stock and sequestration still rely heavily on field sampling activities and laboratory analyses. Despite their accuracy, neither of these methods are applicable for large-scale carbon inventories nor are they practical in areas with limited carbon-related data and laboratory resources. Thus, it is necessary to determine whether any of the seagrass-related variables (e.g., coverage, density and biomass) may be treated as a proxy that are both robust and practical to assess the capacity of seagrass to store and sequester carbon. We developed formulas, assessed their robustness, and used both the formulas and the proxy to estimate carbon stock and the sequestration potential of the seagrasses. Furthermore, this study aims to elucidate the carbon stock and sequestration potential capacity of the seagrass ecosystems in Indonesia. We used the data of seagrass- and carbon-related variables obtained from eleven study sites and developed several candidate formulas using the Robust Linear Mixed Models (rLMMs). We found that the best formulas are comprised of multiple seagrassrelated variables that consistently include biomass and coverage. This suggests that a combination of biomass and coverage is the best proxy to estimate carbon stock; however, a single proxy of seagrass coverage is recommended for practical seagrass monitoring purposes by the local government. Estimations of carbon stock and sequestration subsequently follow the formulas in the present study. Here we estimated, using a single proxy of seagrass coverage, that the above- and below-ground carbon stock, and carbon sequestration capacity of seagrass ecosystems in Indonesia reached 80–314 ktC, 196–696 ktC, and 1.6–7.4 MtC/year, respectively.
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