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Published by Institut Sains dan Teknologi AKPRIND

ISSN : 19798415 EISSN : - DOI : -

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Search results for , issue "Technoscientia Vol 5 No 2 Februari 2013" : 15 Documents clear

OPTIMASI KONDISI PROSES PENGAMBILAN ASAM ALGINAT DARI ALGA COKLAT Purwanti, Ani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Seaweed is a marine product that has been widely used as a food ingredient. In addition, seaweed can also produces carrageenan and alginate which is an important compound in the industry. It is important to know the influential factors and the optimum process conditions to get the maximum alginate yield. In this study, it is to be obtained the optimum process conditions of taking alginate from brown algae (Sargassum cymosum). The seaweed powder was analyzed the water content and the ash content. To get alginate, this material is soaking in acid and to be extracted. It is continued with the process of gel formation and the process of conversion of alginic acid to sodium alginate to obtain dry Na-alginate. The variabel of the experiments are variation of the concen-tration and immersion time in hydrochloric acid solution, the variation of temperature, time, and concentration of sodium carbonate solution that used in the extraction process, the influence of the degree of acidity of the deposition process of alginic acid into alginic acid gel. The optimum conditions that obtained are the immersion time in 0.5M of hydro-chloric acid is 90 minutes, the extraction process conditions are 400C for 90 minutes with the sodium carbonate concentration 0.5 M. The solution acidity of the deposition rate is 3.

CRITICAL REGION - SEMAPHORE MUTEX DALAM CPU OS SIMULATOR V.7.2.27. Hariningsih, S P
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Operating system is a in computer program that regulates the resourcein a computer . The operating systems should monitor the status of each resource, decide which process has to get those resources, allocate resources, and claim back when it has done. To implement the process model, the operating system use a table / array called table with one entry for each process. Each entry contains the status of the process, the program counter, stack pointer, memory allocation, file status, scheduling information, etc. Wich from employment to ready status. In multiprogramming system, the processor also switch from one program to another program, run the program in a few milliseconds. At any given time, the processor is actually just did a program, but in a second of accumulation time, the processor was working on several programs, so the program look run in parallel. Critical region is a port of a program being access memory accordingly. Critical region happere on a mutual exclussion process, which is only one process being execute. Neverthless, there is a certain that we call race condition. It is a situation where some processes are access and manipulate the data accordingly. Thos, we have to pind some methode to prevent leftover process in writing process and reading process for data shared accordingly, at is mutual exclussion. It will examined on OS CPU simulator. Althought it can prevent the race conditions, it isnâ€™t enough to do cooperation between some proces in parallel efficiently in using data shared.

OPTIMASI ALGORITMA SUPER ENKRIPSI UNTUK MENINGKATKAN PENGAMANAN DATA CITRA DIGITALDALAM PENGIRIMAN MMS PADA PIRANTI CERDAS Setyaningsih, Emy; Iswahyudi, Catur; Widyastuti, Naniek
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Advances in technology have made communication and information technology functions into convergent and known as ICT (Information and Communication Technology). Internet and smart devices have an important role as a medium for multimedia convergence at this time. Mobile communications technology also developed rapidly, as well as the development of features that support services in the GSM system, among others, is MMS (Multimedia Messaging Service) that allows data transmission such as images, audio, and video.Computational complexity becomes an important concern in the development of cryptographic techniques on smart devices in the limited of bandwidth on wireless networks, also limited processing, memory, and time. This paper will discuss the security of image message using the concept of super encryption to optimize security of encryption key that adopts the concept of steganography method called End Of File (EOF). Applications built able to combine the speed, security, and flexibility so as to produce a good combination of speed, high security, complexity, reasonable computational overhead, and computational power.Image encryption algorithm is successfully implemented on a smart device with Android based operating system. Application also has the fastprocess and efficient computing resource. These are evidenced by the average time of encryption for image size of 256 x 256 pixels at 0.75 seconds and the image with a size of 480 x 640 pixels at 2.09 seconds. Average time decryption to image size of 256 x 256 pixels by 0.58 seconds and the image with a size of 480 x 640 pixels of 1.66 seconds.

OPTIMASI KONSENTRASI ASAM SULFAT DAN KECEPATAN PENGADUKAN PADA PROSES HIDROLISIS AMPAS TEBU MENJADI FURFURAL Andaka, Ganjar
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

ABSTRACT Hydrolysis of bagasse in the presence of sulfuric acid catalyst to produce furfural was studied. This objective of this work was to study the effects of catalyst consentration and stirrer speed on yield of furfural. The experiment were conducted by reacting bagas-se with sulfuric acid in a three neck flask sized 500 mL equipped with stirrer, heater, condenser, and thermometer. The reaction condition studied were catalyst concentration ranging from 4% to 20% and stirrer speed from 100 rpm to 500 rpm at reaction temperature 100ÂºC and reaction time 120 minutes. The concentration of furfural was analyzed to calculate the yield of furfural. The analysis of bagasse obtained that the water content of 6.76% and pentosan content of 18.86%. The results show that yield of furfural reached a maximum at the catalyst concentration of 8% is 5.79% and the yield of furfural reached an optimum at the stirrer speed of 400 rpm is 6.29%.

MANAJEMEN PORTOFOLIO SEBAGAI STRATEGI KEBERHASILAN PROYEK TEKNOLOGI INFORMASI Setiawan, Herri; N, Ashari S
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

IT project portfolio managementis acomplex phenomenonin portfolio manage-mentasanew concept of knowledge management.Projects whichare toorestricting the us-age of resources without a risk calculation will be have effect to expectations ofthe success of a project.Strong leadership is needed to overcome these barriers, facilitating the new processes, and create a portfolio of projects with appropri at managemment. Knowledgeand understanding of the importance of project portfolio management especially in IT projects is required.The study discusses the descriptionof information technology project portfolio management, portfolio management models, problems and benefits of the implementation of IT project portfolios. The results explain several methods for calculating the economic value ofthe project and the steps in determining the selection of projects based on the constraints specified on IT project.

PEMBUATAN SENTRIFUG GEOTEKNIS DI UNIVERSITI KEBANGSAAN MALAYSIA (UKM) UNTUK KAJIAN LINGKUNGAN -, Muchlis; -, Sukandarrumidi; Wan Yaacob, Wan Zuhairi; Mukhlisin, Muhammad
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Many researchers were conducted using geotechnical sentrifug in studies of the environment. The advantages of using a geotechnical sentrifug are quick to obtain the results, less materials used, economical and can be controlled for factors that are not required in the test. All geotechnical sentrifugs that were conducted are located outside from Indonesia and Malaysia, so that requires for build a geotechnical sentrifug in the country. Engineering methodology was to modify the existing geotechnical sentrifug in other countries. The geotechnical sentrifug that was build Universiti Kebangsaan Malay-sia is 50 cm radius beam type geotechnical sentrifug with dead lock capacity 6 kg and maximum acceleration around 75 gravity. The main components are body, arm, bucket sample, counter weight, motor, contaminant bottle and computer. The geo-technical sentrifug is equipped with speed sensor, close sensor, stroboscope sensor and vibration sensor. This geotechnical sentrifug was conducted in environmental studies.

PENGAMBILAN ZAT WARNA ALAMI ANTHOSIANIN DARI EKSTRAKSI KULIT MANGGIS (Garnicia mangostana L) Murni Yuniwati; Fransiska Ovitasari; Dewi Wulandari
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Mangosteen is a fruit that is very popular in Indonesia. Besides delicious taste, mangosteen also has many benefits and efficacy, including the skin of the fruit. Skin tannin mangosteen contains compounds that can be used in the leather tanning industry, xanthone antioxidants, and anthosianin as a natural dye. Anthosianin in mangosteen skin, can be taken through the process of using solvent extraction and performed in acidic conditions. In this study, the solvent used is etanol and 2N HCl added as much as 0.1% by volume of etanol. The process carried out in a three-neck flask equipped with a heater, stirrer, and cooller. By using raw materials mangosteen peel 5 gams, 100 mL of etanol, and 0.1 mL of 2N HCl, the optimum process conditions obtained by using 3.5 hours, 60 ° C, the solvent content of 96% etanol and stirring speed 300 rpm. Under these conditions obtained anthosianin extracted total of 14.3275 mg.

ANALISIS KARAKTERISTIK POMPA SENTRIFUGAL DENGAN SISTEM SERI DAN PARALEL Subagyo, Rachmat; -, Muchsin; Aulia, Rezky
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The pump is a device for providing mechanical energy to the fluid. At the pump, the fluid density is constant and large. The pump is intended for the transport fluid (horizontal and vertical), raising the pressure and increase speed. The main weakness of the centrifugal pump is located on the limitation of the pressure blower (delivery presure) and not able to provoke their own. For that use multi-level which is usually the same wheelbase and driven by the motor. Various circuits can be used to satisfy a certain condition. Namely series and parallel systems, where a parallel system to increase the pump head and the series system To increase the flow rate.To overcome these problems the research conducted on the characteristics of the pump between the pump with series and parallel systems. To find out the advantages of each characteristic. In this activity, carried out research using the dependent variable valve opening, the load and the volume of water comprising: valve openings Â¼, Â½, Â¾ and 1 and for loading performed at a load 0.25 kg, 0.5 kg, 0.75 kg and 1kg and to use as much water 5 litre, while independent variables are used, namely engine speed of 2980 rpm most of the worth of the smallest worth up to 2945 rpm, the pressure at the pump in and out and the time spent to reach the volume of water by 5 litre. From the test results shows that the comparison between series and parallel pumps each have advantages, further increase in the pump head series and parallel pump further improve the discharge, the pump power and highest efficiency in parallel with 112.79 worth of watts and 65% and the power series highest pump valued at 113.00 watts and the highest efficiency of 53%.

STRATEGI SUPPLY CHAIN USAHA KECIL DAN MENENGAH DENGAN PENDEKATAN ANALISIS SWOT GUNA MENENTUKAN STRATEGI PENGEMBANGAN USAHA DAN PERSAINGAN PASAR -, Sidarto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

In the firms, own small, medium or large in its development have been facing the environment, both the company's own internal environment and external environment of the company. Environmental changes force firms to adjust for the survival of the company itself. So is the Nudi Mulyo Farmers Cooperative, which up to now difficult to develop because of competition from businesses that are located not far from cooperative.One way to determine strategies for developing and managing the market competition is to formulate a strategy to compete with a SWOT analysis approach. In this analysis can be carried out by looking at the internal factors (strengths and weaknesses) that exist within the cooperative and also look at external factors (opportunities and threats). From the results of analysis using the SWOT matrix of the proposed strategy, the first by looking at the strengths and opportunities (SO) should be able to maintain the stability of the cooperative effort considering the number of people around the cooperative livelihood as farmers and farm laborers, while the cooperative it self already has a permanent legal entity, both by looking at the weaknesses and opportunities (WO) cooperative venture must have the courage to raise capital by way of cooperation with investors from the outside, the third with a look of strength and threat (ST) cooperative must be improved its service to customers to cope with competition getting tougher, fourth with a look at the weaknesses and threats (WT) to provide guidance to managers on how to define entrepreneurship and revisit flagship produc and pricing In the foreseeable future, a cooperative must have a clear vision and mission so easy to determine what strategy to do so the cooperative can progress and develop and be able to cope with market competition.

PROSES PEMBUATAN BATU BATA BERPORI DARI TANAH LIAT DAN KACA Hastutiningrum, Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 5 No 2 Februari 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Brick is one of the ingredients of making buildings that currently needs increased mainly due to the porous bricks are stronger and lighter than ordinary bricks, making it great for the foundation of the building. Making bricks porous can use material stuffing form of foam, paper, a rice husk and organic materials. In this research are tried making bricks porous by the use of stuffing form of paper, where these materials are so easily we get. Raw materials used for the manufacture of a porous bricks is glass, clay and water. The purpose of this study was to determine the influence of glass to powerful press of porous brick. Generally, making of porous brick is mixing by powder paper, clay, glass and a little water and then made of dough. Printed and dried dough until weighs constant, then burned in muffle with temperature and time that given. Bricks which has been so then tested strong complained bitterly. The variables used are variable of ratio of clay and glass 1: 1, 1: 1,5, 1: 2, 1: 2.5, and 1: 3, variable of burning time 60 minutes, 90 minutes, 120 minutes, 150 minutes, and 180 minutes and variable of burning temperature 600 oC, 650 oC, 700 oC, 750 oC, and 800 oC. Based on the results of the research that has been done, press optimum strength obtained is 35,26 kg/cm2 with clay and glass ratio 1: 2, while the combustion time 60 minutes, gained strong press optimum of 35,26 kg/cm2 and burning temperatures 700 oC obtained strong press optimum of 36,58 kg/cm2.

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