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"Nikel adalah unsur wng sanga! peniing pada pembualan coran yalzan karat. Dianram harga bahan balm Iainnya nike] adalah yang paling finggi, dan sam' ini masil: diimpor. Penelilian ini berlrguan untuk membandingkan pengaruh penggrmaan _férronickelchrom (Fe-Ni-Cr) lokal lerhadap sw! mekanis dan stnfkmr mikro CFSM (SS 316), dibandingkan dcngan nikef impor. Di/zarapkan bahan ba/fu local ini dapal rrlcnsubslitmri nike! impor sebagai bahan balm comn tahan karat. Variabel penelilian yang digunakan adalah penambahan proscnrase Fe-Ni local pada bahan balm coz-an sebanyak 023 %, 45 %, dan 79 %. Dari musing-masing prosentase tersebut dilaknkan proses pengecoran ffocmdry) aan dilakukan pembuarzm sampe/ :mink :qi komposisi, uji tarik, uji kekerasan, dan anaiisa stmlc!nr_ mikm, baik dengan menggunakan mikroskop optic dan SEM (Scanning Electron Microscope). Unmk dibandingkan dengan bajkz cor CFSM (SS 31 Q yang dibuat dengan nike! iznpor. Hasil penelitian memmjukan bahwa pada semnal sampe! komposfsf kirnia sesnai dengan standar CF8M (SS 316). Pada prosenrase 23 % dan 45 % Fe-Ni-Cr sifht mekanis- dan sn1¢ktm'n1ikronya menyempai 0 % mike! inqvor 100 %) dengan Ima! ran7c 73,58 ksi dan kekerasan 140,65 HB _ Sedanglran :mink prosentase 79 % kuar tariknyn 67,36 ksi, dan kekerasanya 135, 73 HB, masih dibawah srandar minimum CFSM (knat Iarik 70 1:59. Hal ini dikarenakan pada komposisi ini dyurrzpaifaksi volume inklusi yang rertinggi (4 %)."

"Demand for dental health care is increasing, especially in the Orthodontic field. The main objective of orthodontic treatment is to restore malocclusion conditions. Malocclusion causes aesthetics issues for the patient’s face and several discomforts like a difficulty in breathing or swallowing or speaking. If not repaired, a malocclusion could lead to other diseases, such as a greater risk of perforated teeth, gum irritation and temporomandibular disorder or pain in the lower jaw. Malocclusion can be remedied by Orthodontic Brackets. This research aim is to fabricate an orthodontic bracket that is suitable for the teeth structure of the Indonesian people. The fabrication method uses an Investment Casting process. The results show that orthodontic brackets have been successfully produced within an acceptable geometric tolerance, with the exception that surface finish quality has to be improved."

"Desired higher ship speeds can be achieved using many performance enhancement techniques. One of the techniques is drag reduction of ships’ hulls by imbuing their surfaces with hydrophobic properties This paper presents an alternative method of fabricating micro-riblets using laminate transfer molding to modify painting morphology for micro-riblets’ replication on ships’ hulls. A performance test of these micro-riblets is also performed. The results show that micro-riblets can be replicated from the pattern to the ships’ hulls. The geometries of micro-riblets are verified, which shows good agreement with the pattern. The performance of the fabricated micro-riblets was verified to decrease drag on the ship. As a result, ships’ speeds increased under similar propulsion power. The significant effect of micro-riblets is obtained with these higher speeds."