<p>Ti6Al4V ELI merupakan paduan Titanium yang dipakai untuk implan karena memiliki kekuatan mekanis yang baik dan biokompatibilitas terhadap tubuh tetapi material ini kurang bioaktif sehingga perlu dilapisi hidroksiapatit (HA). Tujuan penelitian ini untuk melihat pelapisan hidroksiapatit pada permukaaan material. Penelitian ini tentang pelapisan hidroksiapatit nano dengan metoda elektro phoretik deposition (EPD) pada Ti6Al4V ELI dengan tegangan 5 V dan waktu 5 menit setelah itu di sintering suhu 800ºC. Hasilnya lapisan permukaan material merata, padat, homogen dan tidak ada tracking yang diamati dengan scanning elektron microscopi (SEM).  </p>

Titanium and titanium alloy have been used widely in both orthopedic and orthodontic applications. Dental implant in orthodontic is utilized to replace the missing teeth through implanting them into the human jaw as a teeth root. Ti6Al4V is one of a titanium alloy that has been developed as a dental implant due to its mechanical strength, corrosion resistance, and bio-compatibility. Hydroxyapatite is applied as the coating material is significantly a solution to overcome the inert properties of Ti6Al4V and becomes bioactive. The study goal is to determine the corrosion rate of Ti6Al4V ELI coated nano-sized hydroxyapatite using electrophoretic deposition (EPD) method applying the 5 V voltage and in 5 minutes. The implant was soaked in a solution of artificial saliva for six weeks at fluctuated temperature, 20°C and 60°C. The results showed that the corrosion rate decreased from 1.1413 mpy to 0.4236 mpy because of hydroxyapatite coating. By the hardness properties also decreased from 318 HVN into 203 HVN. This indicated that the nano-hydroxyapatite might inhibit corrosion behavior and during corrosion process occurred the implant was not able to maintain its mechanical properties.

the engine performance is very important at the automotive world, especially on 4-stroke motorcycles, where most people want the engine performance to be better and more economically. In this case to improve engine performance is done by changing the piston on the motor. With a different piston shape can increase the compression ratio. The purpose of this study is to determine changes in compression ratio, torque, power and fuel consumption, after replacing the piston. The test was carried out on a 2006 Honda Tiger, with a standard piston specification with a diameter of 64.5 mm (flat surface) and replaced with a 64.5 mm pro newtech piston (convex surface) by using Pertamax 92 fuel. The results obtained from the comparison of the compression value of 1, 6 : 1, 12.65 ft-lbs of torque, and 2.87 ft-lbs of power so that fuel consumption increases by 5.685%

In the Bukittinggi City Hospital building which has 6 floors, there is a water pump and a reservoir used to supply clean water for daily needs. Based on the reality in the field where there is no secondary data to determine the type of pump and reservoir. The purpose of this analysis is to obtain clean water discharge requirements, obtain the type of pump and ensure that the reservoir used for building C RSUD Kota Bukittinggi is in accordance with the type of pipe and reservoir installed in building C, floor 6. By using field studies and interviews and applying the formulas related to pump calculations. In determining the type of pump to be used in the building, it includes the required water discharge, determining the capacity of the components to be used such as pipe diameter, water tank capacity on the ground floor and roof of the building and the total head on the pipe. Based on the calculation results, the required water discharge is 0.08333 m 3 /min, the upper reservoir has a capacity of 150,000 liters, the bottom reservoir is 5,000 liters and the Hot that occurs is 18.429 m. Then the required pump specifications are 40 x 32B2 -51.5 Grundfos CM 10-3. The pump specifications are not much different from those that have been applied in the field.

Kinematika teknik adalah ilmu yang mempelajari pergerakan suatu mesin dan komponen yang sangat dibutuhkan dalam suatu perancangan mesin. Perancangan alat peraga kinematika engkol peluncur bertujuan untuk mendapatkan parameter kinematika yang bekerja pada engkol peluncur dengan variasi panjang batang dan kecepatan sudut batang input dimana alat peraga yang menampilkan gerak suatu mekanisme tertentu dianggap memadai dan cukup dalam pembelajaran kinematika dan dinamika teknik mesin, dimana pada masing-masing batang dapat ditentukan variasi dimensi batang dan data yang dihasilkan dari perhitungan akan mendapat besaran kecepatan dan percepatan sudut batang yang terjadi pada mekanisme engkol peluncur. Mekanisme engkol peluncur merupakan mekanisme yang umum dan paling sederhana yang terdiri dari 4 batang hubung. Suatu studi komparatif mengenai. Perhitungan kinematika menggunakan dua metode grafis dan bilangan kompleks dimana pada metode grafis menggunakan perggambaran poligon dan pada metode bilangan kompleks dilakukan perhitungan menggunakan rumus pergerakan trigonometri pada masing-masing sudut dan batang. Rata-rata persentase selisih dari perhitungan parameter kinematika dengan dua metode masih berada pada kisaran normal (dibawah 30%) 0,009 sampai 1,256%. Dari hasil analisa dapat disimpulkan bahwa kecepatan sudut batang 2 sangat mempengaruhi kecepatan dari batang 4 dan juga panjang batang 2 sangat mempengaruhi jarak maksimal pergerakan batang 4 (slider).hal ini dapat dilihat pada pergerakan alat peraga engkol peluncur