IPTEK Journal of Proceedings Series
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Abstract of Invited Speaker : An Overview of Ganoderma lingzhi Constituents on α-Glucosidase and Aldose Reductase Inhibitory Activity
No full textGanoderma lingzhi is the medicinal woody mushroom which have been known to have hundreds bioactive compounds. The lanostane-type triterpenoids with carboxyl group in the side chain or known as ganoderma acids were isolated from the fruiting body of G. lingzhi. Some of these compounds were established as active inhibitors of α- glucosidase and human recombinant aldose reductase in vitro. The research objective is to enlighten the role of structural requirement of ganoderma acids both for α-glucosidase and aldose reductase inhibition. Comparing the inhibitory activity of these two enzymes, the structure–activity studies of ganoderma acids showed that the hydroxyl substituent at C-11 and the carboxylic group in the side chain are an important feature both for the recognition of α-glucosidase and human recombinant aldose reductase inhibitory activity. Furthermore, the double- bond moiety at C-20 and C-22 in the side chain and the hydroxyl substituent at C-3 of ganoderma acids enlarge the inhibitory activity of both enzymes. These outcomes offer an approach which to regard as the structural requirements of lanostane type triterpenoids acids from G. lingzhi. A consideration of these requirements is essential in order to develop a new type for substances that can be improved to prevent the diabetic complication
Model Based Controller With Internal Model Control (IMC) Which Tunning By Set Point and Disturbance on Power Plant Based HYSYS
Get PDFWaste heat recovery generation (WHRG) is a power plant systems which utilize waste gas in process of industrie. To design plant of WHRG need right control parameters for maintain heat and mass balance. The control technique of PID is the methode usually used in all industrie by doing tunning based of changes set point changes. In fact, not only based on the change of set point tunning can generate proper response, but the value based on disturbance change of tunning is also appropriate for used. This is due to value based on tunning disturbance can reduce the nuisance value of direct entry at the output of the process. The tunning of the set point value is given i.e. ± 5%, ± 10% and ± 15% of the design data are used, whereas for tunning of disturbance value that is used i.e., ± 5% of the value of the input parameter used as a disturbance. Based on the resulting control response indicates that the method for use to control the tunning disturbance in this research, it is not appropriate to be applied using methods of IMC-PID. This is due to the characteristics of the resulting response indicates a value that is less good
Study Interpretation Phenomenon Magnetostriction and Noise of Lamination FeSi Sheets for Transformer
Get PDFOne of the main problems using a transformer is the vibration and noise. This phenomenon occurs due to deformation/ magnetostriction of lamination sheets transformer core. In this research, the analysis of difference the hysteresis curve, noise and magnetostriction between the rolling direction & the transverse direction have been done. Magnetostriction was measured by gauge of deformation. Acoustic noise was measured by microphone. Magnetic saturation of the rolling direction was higher than in the transverse direction. In contrast, the magnetostriction & acoustic noise of transverse direction was higher than the rolling direction. Harmonic frequency noise measurement had similarities with harmonic frequency magnetostriction: 100, 200, 300, 400 Hz. With increasing current/voltage, the amplitude of the harmonic frequencies noise and magnetostriction will increase
Abstract of Invited Speaker : Utilization of Local Materials in Green Concrete Technology
No full textSustainable development is a concept in green building, which involves ecological, social and economic objectives. It requires to sustain the integrity of resources exploitation, the orientation of technological development and the direction of investments. Concrete is most used construction material worldwide. However, the concrete also brings a great environmental cost. The billions of tons of natural materials mined and processed every year and huge enormous amounts of energy required to produce the cement as well as 7-8% of CO2 released into the atmosphere in the cement processing. This paper discusses the various efforts to improve the concrete environmental friendliness or as a green building material. The most potential successful effort in this matter is utilize local substitutes for cement, especially those that are byproducts of industrial processes, like fly ash, ground granulated blast furnace slag and silica fum
Microbend in an SMS Fiber Structure
Get PDFWe present a numerical and experimental model of microbend in an SMS fiber structure. We obtain the numerical model by using several boundary conditions in SMS fiber structure. These conditions divided into transmission of light in a straight multimode fiber and in a bend multimode fiber. The microbend in multimode fiber affects the radius of curvature of the fiber. Thus, causes radiation several modes and then re-distribution of guided modes. The guided modes itself will vary in MMI and bring out different output power. The numerical result compare well with the experimental result from variation of the radius of curvature of the fiber (R) and the arc length
Prediction of Ternary Vapor-Liquid Equilibria for Alcohols + Glycerol + Water Systems to Enhance the Quality of Glycerol as Biodiesel Side Product
Get PDFFossil fuels as the primary energy resources around the world cause significant negative effect on atmosphere. Recently, biodiesel, which primarily produced from renewable resources, has received great attention because of its environmental benefits. Higher chain of alcohols, such as butanol, may be used as solvent to produce biodiesel with glycerol as byproduct. In order to enhance the quality of glycerol as biodiesel side product which meets food and pharmaceutical standards, vapor-liquid equilibria (VLE) data for ternary systems consisting of 1-butanol, 2-methyl-1-propanol, glycerol and water are required to design and optimize the separation process of glycerol. In this work, the prediction of ternary VLE for (1-butanol / 2-methyl-1-propanol + glycerol + water) using UNIFAC model were determined at various temperatures and compositions and compared with the experimental data giving Average Absolute Deviations (AAD) less than 5.7%. The results indicated that UNIFAC was a reliable model for phase equilibria predictions in the mixtures containing of glycero
An Analysis of E-Commerce Adoption for Small and Medium Enterprises in Indonesia
Get PDFThe amount of small and medium enterprises (SME) is the largest number of business actor in Indonesia. But the contribution of SME is very small compared with large business. Some researchers found that the most influencing factor cause the condition is the use of information technology. May of the SMEs have not seen the power of information technology such as e-commerce. Author uses the qualitative method to gather deep information from informant that unfound in the recent quantitative research. This research will conduct how to implement the e-commerce based on some successful experiences in SME
Acoustic Performance of Live Music Café as Broadcasting Studio Concept at Shop Houses in Surabaya
Get PDFThe development of the business sector, cafe with live music performance in particular, is increasing in urban areas. In general, live music performance in the cafe was followed by a process of event recording, which then be broadcasted for marketing purposes. From this sequence of activities, arise the need of acoustic quality to meet the standard of acoustic comfort for cafe buildings. The selection of research subjects started by sampling a wide variety of cafe buildings in Surabaya, including the type of building, the volume and the ratio of the facade material. Field measurement depends with sampling data and existing circumstances. This paper is a preliminary study that focus to show the field studies. So the final result of this paper is the method and the results of field studies were applied in research workflo
Kinect Depth Image Processing for Hand Motion Recognition using Backpropagation Neural Network
Get PDFKinect RGB-D Camera is a sensor for human gesture recognition. Kinect has built-in infrared array sensor which produces a depth image data. In this research, the depth image data is used to recognize human hand condition. The depth images of human right hand are processed by normalized central moment method. Furthermore, the moment value of hand depth image is used for backpropagation artificial neural network data training. A great training result is yielded by 70% accuracy. In addition, the output of neural netwok model is used to control a robot hand
Implementation of Navigation Target Seeker Mobile Robot Based on Pattern Recognition with Fuzzy Kohonen Network (FKN) Methods
Get PDFNavigation is a technique for determining the position and direction of travel in the actual environment. This navigation system can be implemented on a mobile robot to accomplish a specific task, in this paper is used in order to navigate the robot can move toward a specific target while avoiding obstacles exist. One of the control techniques used in mobile robot navigation is based on pattern recognition techniques. With a pattern that has been previously implanted in the “brains” of the robot, the mobile robot can take action in accordance with the movement of the pattern. This paper used method of Fuzzy Kohonen Network (FKN) in order to be able to navigate a mobile robot to recognize patterns in the environment. The target used is a specific point designated position using a camera support (GPS Ad-hoc). Based on test results using this method, the obtained results are satisfactory, precisely to the targets and fast search time target