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Dita Vořechovská,Martina Šomodíková,Jan Podroužek,David Lehký,Břetislav Teplý 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.1
Service life assessments which do not include the synergy between mechanical and environmental loading are neglecting a factor that can have a significant impact on structural safety and durability assessment. The degradation of concrete structure is a result of the combined effect of environmental and mechanical factors. In order to make service life design realistic it is necessary to consider both of these factors acting simultaneously. This paper deals with the advanced modelling of concrete carbonation and chloride ingress into concrete using stochastic 1D and 2D models. Widely accepted models incorporated into the new fib Model Code 2010 are extended to include factors that reflect the coupled effects of mechanical and environmental loads on the durability and reliability of reinforced concrete structures. An example of cooling tower degradation by carbonation and an example of a bended reinforced concrete beam kept for several years in salt fog are numerically studied to show the capability of the stochastic approach. The modelled degradation measures are compared with experimental results, leading to good agreement.
Indonesian art market : A study of indonesian contemporary art development
Dita Uulandari Utomo 신라대학교 (부산여자대학교) 2013 예술연구 Vol.18 No.-
Indonesian contemporary art is growing and now being themost demanded art market after a period where Chinese art led the high prices of artworks in the global market. The rapid growth of Indonesian art is accelerated by various factors such as politic and economy situation. In this study, the Indonesian art scene will be identified to get a broader view of the development of the visual art in Indonesia. It will be identified in four periods of times which are the colonial era, Old Older of Sukarno (1945- 1966), New Order of Suharto (1966-1998) and the Reformation (1998–present). I will also discuss about the development of the visual art market in Indonesia, how the art market operates and influences the production of visual art in Indonesia, the validation of art and also the role of the Indonesian government, especially in the contemporary visual art. At the end, this study will discuss about the recent phenomenaof Indonesian contemporary art market in the international market and the prospect of the market.
Iqmal Tahir,Karna Wijaya,Mudasir,Dita Krismayanti,Aldino Javier Saviola,Roswanira Abdul Wahab,Amalia Kurnia Amin,Wahyu Dita Saputri,Remi Ayu Pratika 한국재료학회 2024 한국재료학회지 Vol.34 No.2
The optimization of deacetylation process parameters for producing chitosan from isolated chitin shrimp shell waste was investigated using response surface methodology with central composite design (RSM-CCD). Three independent variables viz, NaOH concentration (X1), radiation power (X2), and reaction time (X3) were examined to determine their respective effects on the degree of deacetylation (DD). The DD of chitosan was also calculated using the baseline approach of the Fourier Transform Infrared (FTIR) spectra of the yields. RSM-CCD analysis showed that the optimal chitosan DD value of 96.45 % was obtained at an optimized condition of 63.41 % (w/v) NaOH concentration, 227.28 W radiation power, and 3.34 min deacetylation reaction. The DD was strongly controlled by NaOH concentration, irradiation power, and reaction duration. The coefficients of correlation were 0.257, 0.680, and 0.390, respectively. Because the procedure used microwave radiation absorption, radiation power had a substantial correlation of 0.600~0.800 compared to the two low variables, which were 0.200~0.400. This independently predicted robust quadratic model interaction has been validated for predicting the DD of chitin.
Sagita Diang,Kristanti Dita,Setiaboma Woro,Kumalasari Rima,Ekafitri Riyanti,Yulianti Lista Eka,Putri Devry Pramesti,Ardiansyah Raden Cecep Erwan,Desnilasari Dewi,Hariadi Hari 한국농업기계학회 2023 바이오시스템공학 Vol.48 No.3
Purpose Fermentation in the form of green coffee beans has the potential to alter the flavor and even produce new flavor profiles. However, existing coffee fermentations were still performed traditionally and used ineffective fermenter equipment. In this study, ohmic heating (OH) was first applied to the green coffee bean fermentation. The impact of ohmic heating on the fermentation of green coffee beans was examined. Methods The experiments were performed using green coffee beans, water, and a 1% of instant dry yeast (S. cerevisiae). Three voltage gradient (VG) levels were used as follows: 4, 8, and 12 V/cm. Non-OH fermentation (0 V/cm) and coffee beans without fermentation were also evaluated as controls. The observed parameters included voltage, electrical current, electrical conductivity (EC), power, total energy consumption, coffee bean temperature, environmental temperature, pH of the fermentation medium, and the fermentation index of coffee beans. Results The results showed that OH was effective in generating heat for the green coffee bean fermentation process. The set point temperature was reached faster with increasing VG. The coffee bean temperature was successfully maintained throughout the fermentation process for all VG variations. The variation in VG significantly impacted the electrical current, power, and time needed to reach the set point temperature but did not have a significant effect on total energy consumption and EC. During fermentation, the EC of the green coffee beans with instant yeast solution increased due to an increase in electrical current. The final pH value was significantly different between OH and non-OH fermentation, with OH fermentation resulting in the highest fermentation index. Conclusions The findings of this study indicate that OH treatment can significantly improve the fermentation process of green coffee beans indicated with lower pH and higher fermentation index.
Effect of Several Exterior Adhesive Types on Dimensional Stability of Bamboo Oriented Particleboard
Iswanto, Apri Heri,Munthe, Rensus,Darwis, Atmawi,Azhar, Irawati,Susilowati, Arida,Prabuningrum, Dita Sari,Fatriasari, Widya Materials Research Society of Korea 2019 한국재료학회지 Vol.29 No.5
The objective of this research is to evaluate the effect of adhesive types on dimensional stability of bamboo-oriented particleboard. The materials used in this research are bamboo tali(Gigantochloa apus J.A & J.H. Schult. Kurz), UF/MDI(8, 10, 12 % level), and MF, MDI, and PF at 7 % level. Particle and adhesive are mixed using a blending machine; then, mat forming and hot pressing processes are performed using adhesive-suitable temperature and time references. MDI resin is set at $160^{\circ}C$ temperature for 5 minutes. PF resin and MF resin are pressed at $170^{\circ}C$ for 10 minutes, and $140^{\circ}C$ for 10 minutes, respectively, while UF/MDI sets at temperature of $140^{\circ}C$ for 10 minutes. The results show that particleboard using PF resin produces the lowest thickness swelling value. The particleboard using UF/MDI resin also produces good response for thickness swelling value. Interesting things happen in that UF/MDI adhesive produces a thickness swelling value better than that of MDI resin. FTIR analysis on particleboard bonded by UF/MDI resin combination shows the presence of carbonyl group C=O vibration on multi substitution of urea at wave number of around $1,700cm^{-1}$.