Permatasari A.R.,Trisakti University |
Nazri M.J.M.,University of Technology Malaysia
AIP Conference Proceedings | Year: 2016
The emission from FBC is very dependent on a number of operating conditions (temperature, staged air, fuel feed rate, excess air, etc.) and fuel properties. This paper describes the experimental results taken in a staged air fluidized bed combustion laboratory scale, using palm fiber and palm shell as fuels and silica sand as the inert bed material. In this experiment, a variation of excess air and secondary air were measured. Measurement of gas emissions of CO and CO2 concentrations, combustion efficiency and temperature, were taken along the combustor height as well as in flue gas. The experimental results show that the axial temperature profiles decrease successively along the FBC height. The CO emission obtained was lower for the staged- air condition than for the un-staged-air condition. The combustion efficiencies show satisfactory values. © 2016 Author(s).
Arya A.C.,Trisakti University
Pertanika Journal of Tropical Agricultural Science | Year: 2017
The empty fruit bunch of oil palm (EFB) is the solid waste that is generated at palm oil mills. In 2012 only, it was available in large amounts by more than 50 million tons worldwide. Its utilisation for technical purposes is unfortunately very limited and so far, it is still less value-added. It would be interesting to discover the appropiate technology so that the biomass has an added-value such utilisation for technical and commercial products. Fibre from EFB can be processed to be environmentally-friendly composites by mixing the fbres with renewable binding agents based on starch such as potato starch. There are some options to forming the between product into a composite such as creating a dough base frst that is then laminated and fnally mixed (nonwoven). Experiments to produce possible composites can be done where the combination between product and technology matches so that the fbres are spread randomly and homogenously throughout the body of the composite. The variables for this option of producing a composite with a thickness of 2 mm are a temperature of 180°C, press duration of 5-15 min and pressure of about 10-30 bar where the modulus of elasticity is about 7 GPa. © Universiti Putra Malaysia Press.
Pratiwi D.,Trisakti University |
Ariwibowo A.B.,University of Indonesia
International Journal of Mechanical and Mechatronics Engineering | Year: 2017
Generally, in the diagnosis of dengue fever, the action taken by the doctor is to see the external symptoms that arise. From these actions, to ensure the disease that arises then will be continued by taking blood samples. From these results can be sure what disease is suffered and as bad as what conditions, where the analysis can be done only by a specialist. This is the basis of the researchers to develop a system to analyze dengue fever, where the severity of the disease is determined based on the value of eight components of cells in the blood through the method of Perceptron Artificial Neural Network. This study consists of three main stages, namely laboratory data collection, data normalization with Min-Max method, and severity of dengue disease measurement through neural network. First, all data collection normalized to change the input value interval from eight different blood components to the same interval, which is between 0 to 1. After that, the data is processed into the network training stage to get the weights. These weights are then used in the testing phase along with the testing data to obtain the diagnostic results of the severity of dengue fever. From the testing result of system using parameter of learning rate equal to 0.3, tolerance value of 0.02, 8 input units, 2 output units, binary activation function with threshold equal to 0.5, and number of training sample as much as 20 data, maximum accuracy reached by system le 80%, which 8 out of 10 data successfully predicted the severity level correctly (according to doctor's diagnosis). Therefore, it can be concluded that the application system developed can be applied to help doctors or other medical parties in determining the severity of dengue fever based on the results of blood testing with a fairly good percentage of accuracy, so it can be quickly handled as well as appropriate treatment provided. © June 2017 IJENS.
Rinanti A.,Trisakti University
International Journal of GEOMATE | Year: 2017
Oil content extraction from the rock pores can be very complicated due to the high viscosity of petroleum oil and low degree of reservoir rock porosity as well as its permeability. A research had been carried out with the use of mix populations of indigenous bacteria isolated from formation water (fw), well-site sludge (ws) and well mud (wd). Limestones was used as samples. This cores were soaked for 2 (two) weeks in 550C, a media contained of 1% molasse dissolved in sterillized formation water and 20% crude oil as covering. During the research, there was a change in the pH environment from neutral to acid. Acid production from the reaction result with carbonate in the solution will lower pH of the water that was produced. Changing value of porosity (%) that was injected by bacteria from fw, ws, and wd, increases respectively 23.22, 68.29, 14.89, and changing value of permeability (%) respectively 56.28, 137.83, 35.77. Even though on average there were an increase in value of porosity and permeability, there were also a decrease in the value of porosity and permeability of a few of the limestones samples. Inoculum bacteria from the pollution around the oil well are much more adaptive and give more carbonate dissolving reaction than the other actions. MEOR (microbial enhanced oil recovery) technique is really dependent on the growth of the microbes in site, and the development of the secondary metabolit products that can change the porosity and permeability of the reservoir limestones. © Int. J. of GEOMATE.
Amran T.G.,Trisakti University |
Fatima Z.,University Tun Hussein Onn Malaysia
AIP Conference Proceedings | Year: 2017
This paper presented Lagrange Muktiplier approach for solving perishable raw material inventory planning considering warehouse capacity. A food company faced an issue of managing perishable raw materials and marinades which have limited shelf life. Another constraint to be considered was the capacity of the warehouse. Therefore, an inventory model considering shelf life and raw material warehouse capacity are needed in order to minimize the company's inventory cost. The inventory model implemented in this study was the adapted economic order quantity (EOQ) model which is optimized using Lagrange multiplier. The model and solution approach were applied to solve a case industry in a food manufacturer. The result showed that the total inventory cost decreased 2.42% after applying the proposed approach. © 2017 Author(s).
Trihandini I.,University of Indonesia |
Wiradidjaja Adiwoso A.,Rehabilitation Center |
Erri Astoeti T.,Trisakti University |
Marks L.,Ghent University
International Journal of Paediatric Dentistry | Year: 2013
Background: Data on the oral situation of young people with intellectual disabilities are scarce, especially data of children from a developing country. Aim: To describe and to evaluate the oral treatment needs of Special Olympics Special Smiles Athletes in Indonesia between 2004 and 2009. Design: A cross-sectional study data were collected through interviews and clinical examinations using the Special Olympics Special Smiles CDC protocol. Participants: Indonesian Special Smiles athletes; their mean age was 13.46 years ± 2.97. Results: More than 70% of athletes had visible untreated decay. Almost 30% (29.8%) of the athletes had gingival inflammation. Pain in the oral cavity was reported by 28.6%. Athletes who had untreated decay reported 6.67 times (95% CI OR; 4.00-11.14) more pain compared to those who did not have untreated decay. Athletes living in provinces on Java Island had 1.54 times (95% CI OR; 1.15-2.07) more untreated decay compared to the athletes who live in provinces in outer Java Island. 21.63% of the screened athletes were referred to the dentist for urgent treatment. Conclusion: The results suggest that there is an elevated oral treatment need in Indonesian Special Smiles population. © 2012 John Wiley & Sons Ltd, BSPD and IAPD.
Moore T.A.,Cipher Consulting Ltd. |
Moore T.A.,University of Canterbury |
Bowe M.,Ephindo Energy Pte Ltd. |
Nas C.,Trisakti University
International Journal of Coal Geology | Year: 2014
The Balikpapan Formation (Miocene age) in Sangatta, East Kalimantan is thick (>1500m) containing abundant coal seams that range in thickness from less than a meter to over 5m. Coal seams are distributed throughout the section and may represent 5 to 7% of the total formation thickness. Measured gas contents range from <1 to 13m3/t (as received basis). The variation is both stratigraphically and geographically controlled. In samples from three drill cores, trends of vitrinite reflectance, calorific value, and moisture content indicate that rank increases down hole. Measured gas content also increases down hole in each core locations. However the rate of change down hole for all of those parameters increases with proximity to the southwestern corner of a geological feature known locally as the Pinang Dome. The Sangatta area has a higher geothermal gradient (50°C/km) than most other parts of East Kalimantan (25-40°C/km). It is well documented that the southwest part of the Pinang Dome has elevated organic maturation levels. It is concluded that there is higher heat flow in this area and thus coal beds in proximity have been thermally altered. This is evident not just in the increased rank and measured gas contents but also in the higher CO2 and C2+ gas composition found adjacent to the southwest corner of the Pinang Dome. It is hypothesized that the gas origin in the higher rank area could be thermogenic while gas isotopes from the well furthest from the Pinang Dome, with the lowest rank coals, indicate biogenic origins. © 2014 Elsevier B.V.
Pusparini,Trisakti University |
Yenny,Trisakti University |
Hidayat A.,Trisakti University
Endocrine, Metabolic and Immune Disorders - Drug Targets | Year: 2015
Dietary isoflavones are considered to be cardioprotective because of their structural similarity to estrogen. Equol is a metabolite of daidzein that is more potent than daidzein itself. The effect of equol on endothelial function and oxidative stress remains unclear. The objective of this study was to determine the effect of 100 mg/day soy isoflavone supplementation on the following markers: vascular cell adhesion molecule-1 (VCAM-1) and nitric oxide (NO) as markers of vascular endothelial function, and malonyldialdehyde (MDA) as oxidative stress marker in equol-producing postmenopausal women. A stratified randomized double blind controlled trial was conducted among 190 postmenopausal Indonesian women aged 47 to 60 years. They were stratified into equol producers and equol nonproducers. The random allocation of intervention was carried out separately in each stratum. The intervention group received tablets consisting of 100 mg soy isoflavones and calcium carbonate 500 mg, and the control group received 500 mg calcium carbonate. The concentrations of VCAM-1, NO and MDA were measured at baseline and post-supplementation at 6 months. After 6 months of supplementation the MDA concentrations were significantly lower in the soy-isoflavone equol producers compared with equol nonproducers (p=0.021). Similar results were also found for VCAM-1 and NO concentrations, but these were statistically not significant (p = 0.413 and p= 0.724, respectively). This study demonstrates that isoflavone supplementation in postmenopausal women with equol-producer status had a more beneficial effect by decreasing the MDA concentration, but did not improve VCAM-1 and NO concentrations. © 2015 Bentham Science Publishers.
Amin J.J.A.,Trisakti University
51st World Congress of the International Federation of Landscape Architects, IFLA 2014 | Year: 2014
This writing investigates the above phenomena and aimed to introduce the Indonesian Javanese ways of thinking and 'reading' their natural and human-made landscapes through narratives and rituals of the shadow puppet (wayang) which conveys the meaningful and rich cultural memories (context, history, tradition and local wisdom) about earth, land and landscape. The Javanese culture is a dominant one in Indonesia. Wayang is a popular puppet shadow play, or better, a ritual in traditional Java; a living tradition that can be used as a tool to dig up the people's ideas and concept of nature and landscape. UNESCO in 2003 has decided wayang as 'Masterpiece of Oral and Intangible Heritage of Humanity' in 2003. Almost every aspect of wayang is imbued with symbolic meaning. For instance, the noncharacter wayang, the kayon, represents center of the Javanese ordered cosmos, a reflection of the wishing tree - symbol of the cosmic order. This is a reflection of the old primordial binary concept with addition of the center element - to create a balanced world. Earth becomes land when people start to work on it or put they imprint on it for living, Land becomes landscape when it is crafted in a way that fulfils the functional and aesthetic needs of the people. It is argued that narrative of this kind can be used to trace creative efforts in space and place-making in traditional landscape and as a way to tell stories that link people to place and how their design can become important vehicle for making values of conservation visible. The understandings gained can address the multiple and complex issues in sustainable development to reveal a sense of identity on creation of space and place which now becomes a necessity in this globalization era.
Kadri T.,Trisakti University
WIT Transactions on Ecology and the Environment | Year: 2011
There are nine major rivers flowing through Jakarta, the capital city of Indonesia. The total extent of the nine watersheds in Jakarta and its vicinity is about 106,000 ha. The average annual rainfall of three stations (1972-2008) throughout the watersheds is 2973 mm. The growing population and business activities have caused a tremendous conversion of land use. This problem is likely to cause an increase of surface run-off which in turn causing floods in rainy seasons. One of the rivers which floods frequently is Sunter River. It vicinity is about 73 184 092 m2 and water flow 83.8 m3/s at rainfall 100 mm. The land use in this area is very populated, so the rainfall with high intensity always causes floods. Many efforts have been made to solve the flooding but have not yet given optimum results. One effort to solve flooding is the rehabilitation of existing small lakes and building new lakes to accommodate the surface run-off. There are 5 lakes that already exist in that area (37.2 ha) and 11 alternative new small lakes to be built with 163.74 ha area. To evaluate potency of the lakes to reduce flood risk in the Sunter river area, a hydrology simulation is done. This research showed comparative study and how effective the small lakes are in reducing flood risk. © 2011 WIT Press.