Judul: Simulasi Piranti N-Mosfet Dengan Metode Finite-Difference
Abstrak: Piranti MOSFET (Metal Oxide-Semiconductor Field Effect Transistor). adalah bagian terpenting dari rangkaian terintegrasi berskala sangat besar (Very Large Scale Integrated Circuit - VLSI) seperti pada mikroprosesor dan memori. Penelitian piranti MOSFET terus dikembangkan untuk memperoleh piranti yang lebih kecil lagi dengan karakteristik yang lebih baik. Di dalam rangkaian terintegrasi mikroprosesor yang ada saat ini terdapat dua juta sarnpai sembilan juta transistor. Transistor yang digunakan adalah MOSFET. Jadi perkembangan teknologi MOSFET sangat berpengaruh terhadap perkembangan teknologi komputer dan elektronika. MOSFET adalah suatu piranti dengan empat terminal, yaitu: drain, gale, source dan base. Dalarn simulasi ini yang akan dimodelkan adalah n-MOSFET yaitu MOSFET dengan n-channel dimana operasi piranti ini didasarkan atas pembentukan II-challllel pada substrat semikonduktor tipe-p. Piranti n-MOSFET terdiri dari substrat semikonduktor tipe-p dan dua daerah semikonduktor tipe-n + pada bagian kontak source dan draill. Kontak logam pada daerah oksida disebut gale. Bagian tengah dari piranti ini identik dengan dioda persambungan logam dengan oksida semikonduktor (MOS - Metal Oxide Semiconductor).
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Judul: Pembuatan dan Karakterisasi Field Effect Transistor (FET) Berbasis Poly 3-Hexylthiophene (P3HT) untuk Mendeteksi Gas Amonia
Abstrak: Piranti FET berbasis P3HT telah dibuat dalam penelitian ini untuk dapat mendeteksi gas amonia. Lapisan silikon dioksida (SiO2) sebagai lapisan dielektrik pada piranti FET telah ditumbuhkan di permukaan atas substrat silikon dengan metode thermal, lalu substrat silikon dipanaskan menggunakan furnace pada suhu 1000oC selama 3 jam, kemudian gas oksigen (O2) dialirkan ke dalam furnace selama proses pemanasan berlangsung yang bertujuan agar gas oksigen berikatan dengan silikon sehingga membentuk lapisan SiO2. P3HT sebagai lapisan aktif pada piranti FET ditumbuhkan di permukaan atas lapisan SiO2 dengan metode spin coating. Hasil karakterisasi EDX menunjukkan bahwa dalam substrat silikon yang telah dioksidasi terdapat kandungan unsur O2 sekitar 35% dan unsur silikon sekitar 65%. Hasil pengujian karakterisasi I-V menunjukkan arus drain-source (Id-s) yang diperoleh dipengaruhi oleh perubahan tegangan gate (Vg). Semakin besar Vg yang diberikan maka Id-s yang dihasilkan semakin meningkat. Pengaruh gas amonia terhadap kurva karakteristik I-V menunjukkan bahwa Id-s yang dihasilkan semakin menurun seiring dengan penambahan konsentrasi gas amonia. Berdasarkan hasil respon dinamik piranti terhadap gas amonia memperlihatkan bahwa semakin besar Vg yang diberikan maka sensitivitas piranti semakin tinggi. Pada saat diberi Vg = -8 volt, setiap perubahan konsentrasi 1% maka akan terjadi kenaikkan tegangan sebesar 0,264 volt. Sedangkan ketika Vg = 0 volt, setiap perubahan konsentrasi sebesar 1% maka terjadi kenaikkan tegangan sebesar 0,236 volt.
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Judul: Dog Ticks Infestation and Its Correlation to Tick-Borne Diseases.
Abstrak: Ticks infestation on dog could lead to itchiness, anemia, skin disorders, and tick-borne diseases, such as Ehrlichiosis, Babesiosis, Anaplasmosis and Rocky Mountain Spotted Fever. Besides dogs, Ehrlichiosis were known to be zoonotic. Pre-mature stage tick life cycle that occur outside its host, will enhance contacts between ticks and human. The study of ticks infestation and tick-borne diseases on the dog is necessary, because it has not a lot of information about the diversity, prevalence and degree of ticks infestation in Indonesia. Ticks survey, included ticks sampling and dogs blood test were performed at Animal Police Directorate Security Agency (Baharkam) and Atang Sendjaja Air Force (ATS). Meanwhile ticks sampling also data of cases of ticks infestation and diseases transmitted obtained from 21 veterinary clinics in Bogor, Jakarta and Bandung. All ticks samples stored in bottles containing 70% alcohol for identification. Blood tests performed for Ehrlichiosis, Babesiosis and Anaplasmosis diagnosis. The identification results of the 950 ticks samples that obtained from 97 dogs of Baharkam, ATS and veterinary clinics in Bogor, Jakarta and Bandung, showed only one ticks species, Rhipicephalus sanguineus. This ticks belong to three-host tick, which require three hosts to complete its life cycle. Each ticks stage need a host, either same dog (if it is in place there is only one or a few dogs), as well as different dogs. Research in Baharkam conducted on 81 dogs (53 males and 28 females). The prevalence of dogs infested by ticks was 67.90%. The percentage of male dogs that infested by ticks are larger (69.81%) than female (64.29%). Based on Chi-Square test, there was no relationship between sex and breed of dog with degree of ticks infestation. Generally dogs infested with mild infestation category (41.98%), meanwhile moderate category was 18.52%, 2.47% high and 4.94% very high. The dog’s body region that the most infested by R. sanguineus was dog's back. Probably these body regions were be preferred because they are less accessible for the dog to remove them with its paws. Collection of ticks with tick-drag on Baharkam grass field showed positive results on the field that was more often used to practice by dogs. The samples that obtained was larvae stage ticks with density 152 larvae on 215m2 area of the field. Adult stage ticks and several adult females which laying eggs on the cage wall were obtained in the dog kennels. Whole of male and female ATS dogs infested with ticks (14 dogs). In general, dogs infested with very high infestation category was 64.29%, compared by high degree category (21.43%) and moderate (14.29%). Ticks predilection were found mostly on the dog’s head – neck. On ATS grass field did not reveal any ticks, but positively inside the kennels. It happens probably because dogs are rarely released from the kennel, so that the ticks was did drop-off inside the kennel. The total cases of ticks infestation of dogs at Bogor, Jakarta and Bandung veterinary clinics in 2008 until June 2013 as many as 731 cases. In general, there was an increases of the ticks infestation prevalence at three cities in that range
Keyword: Anaplasma, Babesia, Ehrlichia canis, Rhipicephalus sanguineus