19 research outputs found
Identifikasi Karakter Morfologis dan Hubungan Kekerabatan Beberapa Genotipe Durian (Durio zibethinus Murr) di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara
No full textNAZRIAH PRATIWI : Identifikasi karakter morfologis dan hubungan kekerabatan beberapa genotip Durian (Durio zibethinus Murr) di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara. Dibimbing oleh Dr. Diana Sofia Hanafiah, SP., MP., dan Luthfi A. M. Siregar, SP., M.Sc., Ph.D.,. Penelitian ini bertujuan untuk mengidentifikasi karakter morfologis dan hubungan kekerabatan beberapa genotip durian yang ada di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara. Penelitian ini dilakukan di Kecamatan Tigalingga dan Kecamatan Pegagan Hilir Kabupaten Dairi mulai bulan Desember 2016 sampai dengan Januari 2017 menggunakan metode survei deskriptif menggunakan panduan descriptors for durian (Bioversity Internasional) dengan teknik pengambilan sampel secara accidental sampling. Hasil penelitian ini menunjukkan bahwa terdapat 20 genotip durian di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi yang diidentifikasi. Hubungan kekerabatan terdekat pada genotip G9 dan G20 dengan koefisien ketidaksamaan sebesar 4,243 dan hubungan kekerabatan terjauh pada genotip G2 dan G12 dengan koefisien ketidaksamaan sebesar 9,798.NAZRIAH PRATIWI : Identification of morphological characteristic and genetical relationship among durian (Durio zibethinus Murr.) genotype in Tigalingga and Pegagan Hilir districts Dairi regency North Sumatra. Supervised by Dr. Diana Sofia Hanafiah, SP., MP., and Luthfi A. M. Siregar, SP., M.Sc., Ph.D.,. The purpose of this research is to identify of morphological characteristic and genetical relationship among durian genotype in Tigalingga and Pegagan Hilir districts Dairi regency North Sumatra. The research was conducted in Tigalingga and Pegagan Hilir districts from December 2016 to January 2017, data was identified by descriptive methode based on descriptors for durian (Bioversity Internasional) with sampling technique using accidental sampling. The result showed that there were 20 genotype of durian found in Tigalingga and Pegagan Hilir districts Dairi regency. The closest relationship is G9 and G20 with a coefecient dissimilarity 4,243 and farthest relationship is G2 and G12 with coefecient dissimilarity 9,798.Skripsi Sarjan
Identifikasi Karakter Morfologis dan Hubungan Kekerabatan Beberapa Genotipe Durian (Durio zibethinus Murr) di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara
No full textNAZRIAH PRATIWI : Identifikasi karakter morfologis dan hubungan kekerabatan beberapa genotip Durian (Durio zibethinus Murr) di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara. Dibimbing oleh Dr. Diana Sofia Hanafiah, SP., MP., dan Luthfi A. M. Siregar, SP., M.Sc., Ph.D.,. Penelitian ini bertujuan untuk mengidentifikasi karakter morfologis dan hubungan kekerabatan beberapa genotip durian yang ada di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi Sumatera Utara. Penelitian ini dilakukan di Kecamatan Tigalingga dan Kecamatan Pegagan Hilir Kabupaten Dairi mulai bulan Desember 2016 sampai dengan Januari 2017 menggunakan metode survei deskriptif menggunakan panduan descriptors for durian (Bioversity Internasional) dengan teknik pengambilan sampel secara accidental sampling. Hasil penelitian ini menunjukkan bahwa terdapat 20 genotip durian di Kecamatan Tigalingga dan Pegagan Hilir Kabupaten Dairi yang diidentifikasi. Hubungan kekerabatan terdekat pada genotip G9 dan G20 dengan koefisien ketidaksamaan sebesar 4,243 dan hubungan kekerabatan terjauh pada genotip G2 dan G12 dengan koefisien ketidaksamaan sebesar 9,798.NAZRIAH PRATIWI : Identification of morphological characteristic and genetical relationship among durian (Durio zibethinus Murr.) genotype in Tigalingga and Pegagan Hilir districts Dairi regency North Sumatra. Supervised by Dr. Diana Sofia Hanafiah, SP., MP., and Luthfi A. M. Siregar, SP., M.Sc., Ph.D.,. The purpose of this research is to identify of morphological characteristic and genetical relationship among durian genotype in Tigalingga and Pegagan Hilir districts Dairi regency North Sumatra. The research was conducted in Tigalingga and Pegagan Hilir districts from December 2016 to January 2017, data was identified by descriptive methode based on descriptors for durian (Bioversity Internasional) with sampling technique using accidental sampling. The result showed that there were 20 genotype of durian found in Tigalingga and Pegagan Hilir districts Dairi regency. The closest relationship is G9 and G20 with a coefecient dissimilarity 4,243 and farthest relationship is G2 and G12 with coefecient dissimilarity 9,798.Skripsi Sarjan
Consistent machining of electrical discharge machining power supply towards hip implant surface texturing
No full textElectrical Discharge Machining, EDM is one of the technologies used for surface
texturing such as the embedded micro-dimples on the metallic acetabular cup. During
the machining process, changes in the gap distance may lead to load changes from
open to short circuit. Limiting the load current under short circuit conditions and load
voltage under open circuit conditions is the requirement in this system. Power supply
is one of the elements that controls the process parameters which is related to improve
the machining condition as well as Material Removal Rate (MRR). A considerable
number of power supply design method were proposed for various EDM application.
This research proposed a Switch Mode Power Supply method implementing new
design of Flyback power supply which can stabilize the voltage during open circuit
condition as well as during discharge condition. Experimental studies were conducted
to verify the capability of Flyback power supply by machining eight micro-dimples in
lower position and twelve micro-dimples in upper position, both in circular
arrangement on metallic acetabular cup. Research conducted shows that the Flyback
power supply improve the consistency of MRR when compared to Linear power supply.
This may help to predict the machining time, thus improving the production of microdimples
in required time
Design and implementation of flyback converter for electrical discharge machining power generator
No full textElectrical Discharge Machining process has been widely used for manufacturing micro components due to its contactless process. Its application has also been introduced in machining micro pits on hip implant. In this paper, a new design of power generator is proposed in order to reduce micro crack while machining take place. Flyback Switch Mode Power Supply has been chosen because of its high efficiency. The simulation of Flyback converter using LT Spice is presented. The result shows that the system achieves 95.9% of efficiency. Experimental results show that flyback converter able to produce DC voltage up to 111.6 V
Pulse power generator design for machining micro-pits on hip implant
No full textMachining micro-pits on hip implant for lubrication purpose is the most effective way to minimize wear as well as prolong the lifespan of the hip implant. Several works on designing Pulse Power Generator for machining micro-pits has been conducted but suffer from micro crack. Thus, in this research, a new design of Electrical Discharge Machining Pulse Power Generator is implemented which consist of Flyback converter circuit and Current Mode Controller Integrated Circuit. The work involves the design and development of the SIMULINK behavior model of the overall system. The machining performance of the system is evaluated by changing the input voltage
Stabilize machining condition of electrical discharge machining to minimize friction of hip implant
Get PDFElectrical Discharge Machining, EDM is one of the technologies used for surface modification such as the embedded micro-dimples on the metallic acetabular cup. During the machining process, changes in the gap distance may lead to load changes from open to short circuit. Limiting the load current under short circuit conditions and load voltage under open circuit conditions is the requirement in this system. Power supply is one of the elements that controls the process parameters which is related to improve the machining condition as well as Material Removal Rate (MRR). This research proposes a Switch Mode Power Supply method implementing new design of Flyback power supply which can stabilize the voltage during open circuit condition as well as during discharge condition. A model of Flyback power supply was designed and simulated using MATLAB/SIMULINK to investigate the response of the model by measuring the output voltage. The design was then fabricated and an experiment was conducted to validate the simulation. Eight micro-dimples in lower position and twelve micro-dimples in upper position, both in circular arrangement were machined on metallic acetabular cup using Flyback power supply and Linear power supply. Each micro-dimples were then further investigated to find the MRR. The experimental studies then followed by tribological test to screen the friction and wear rate. This experimental work is conducted using four ball tester to describe the friction from the coefficient of friction value measured. Research conducted shows that the Flyback power supply improve the consistency of MRR by 4.2 % for electrode diameter 1000 ^m and 21 % for electrode diameter 500 ^m. This consistency may help to predict the machining time, thus improving the production of micro-dimples in required time. The quantitative results of the friction test concluded that metallic acetabular cup with 8 micro-dimples has reduce the friction and delayed severe damage, which may then prolong the survival rate of hip implant
Consistent machining of electrical discharge machining power supply towards hip implant surface texturing
Get PDFElectrical Discharge Machining, EDM is one of the technologies used for surface texturing such as the embedded micro-dimples on the metallic acetabular cup. During the machining process, changes in the gap distance may lead to load changes from open to short circuit. Limiting the load current under short circuit conditions and load voltage under open circuit conditions is the requirement in this system. Power supply is one of the elements that controls the process parameters which is related to improve the machining condition as well as Material Removal Rate (MRR). A considerable number of power supply design method were proposed for various EDM application. This research proposed a Switch Mode Power Supply method implementing new design of Flyback power supply which can stabilize the voltage during open circuit condition as well as during discharge condition. Experimental studies were conducted to verify the capability of Flyback power supply by machining eight micro-dimples in lower position and twelve micro-dimples in upper position, both in circular arrangement on metallic acetabular cup. Research conducted shows that the Flyback power supply improve the consistency of MRR when compared to Linear power supply. This may help to predict the machining time, thus improving the production of microdimples in required time
Electrical Discharge Machining Flyback Converter using UC3842 Current Mode PWM Controller
No full textThis paper presents a current mode Pulse Width Modulation (PWM) controlled Flyback converter using UC3842 for Electrical Discharge Machining current generator control circuit. Circuit simplicity and high efficiency can be achieved by a Flyback converter with current mode PWM controller. The behaviors of the system's operation is analyzed and discussed by varying the load resistance. Matlab sofware is used to simulate the Flyback converter where a prototype has been built and tested to verify it's performance. DOI: http://dx.doi.org/10.11591/ijpeds.v5i2.668
Electrical Discharge Machining Flyback Converter using UC3842 Current Mode PWM Controller
Get PDFThis paper presents a current mode Pulse Width Modulation (PWM) controlled Flyback converter using UC3842 for Electrical Discharge Machining current generator control circuit. Circuit simplicity and high efficiency can be achieved by a Flyback converter with current mode PWM controller. The behaviors of the system's operation is analyzed and discussed by varying the load resistance. Matlab sofware is used to simulate the Flyback converter where a prototype has been built and tested to verify it's performance. DOI: http://dx.doi.org/10.11591/ijpeds.v5i2.668
Flyback converter of electrical discharge machining power supply: application to surface texturing
Get PDFElectrical Discharge Machining, EDM is one of non-conventional machining process that is currently applied for surface texturing. Power supply is one of the components in EDM that control process parameters which will directly influence the machining condition as well as Material Removal Rate (MRR). In this study, Flyback converter has been proposed as the new power supply. An experimental studies were conducted to verify the performance of Flyback converter by machining twenty micro-dimples in circular arrangement on metallic acetabular cup. Material removal are calculated by weighing the workpiece before and after machining. The results show a consistent value of material removal when Flyback converter is applied compared to Linear power supply. Therefore, Flyback converter is highly recommendation to be used as EDM power supply
