Judul: Sensor Field Effect TransistorBerbasisNanoseratPolianilin untukMengukur Konsentrasi Gas Amonia
Abstrak: Gas sensors can be made of metal, metal oxide, organic conductive polymers. Gas sensors of organic conductive polymers have superiority such as showing good sensitivity to the vapors of organic compounds and can be used at room temperature. Polyaniline nanofiber as active layers of Field Effect Transistor (FET) sensor sensitive in responding to ammonia gas (NH3). This research consists of manufacturing and characterization of FET sensor and determine the sensitivity of the FET sensor. FET sensor is made by oxidizing silicon wafers (the type-p Si) as layer dielectric (SiO2) and coating polyaniline nanofiber on SiO2 layers. On the type-p Si layer isset with gate electrode while polyaniline nanofiber layer is set with drain and source. When the FET sensor is given with more negative gate voltage so that drain-source current increases. Sensitivity value of FET sensor at Vg = 0 V is obtained 3.4215 V/% and Vg = -5 V is obtained 3.9018 V/%. The sensitivity test results showsmore and more negative gate voltage is given to be the greater the greater sensitivity value.
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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: Ragam jenis ektoparasit burung tekukur (Streptopelia chinensis) dan burung puter (Streptopelia bitorquata) di penangkaran
Abstrak: Spotted dove and Javan turtle dove are the bird species that are easily raised in captivity. Nevertheless, good management is required to successfully breed and raise the birds in captivity; otherwise, the condition may endanger the sustainability of the two bird species. Information on ectoparasites on the bodies of this bird as well as their captivity breeding has not been available, although admittedly taking ectoparasites from these bird families has much been done so that a research is obviously needed. This study aimed to find out various kinds of Spotted dove and Javan turtle dove ectoparasites and to learn various kinds of parasitic insects around the Spotted dove and Javan turtle dove cages. The study was conducted from April to June 2010. The methods of data collection included the general condition of the location, collection of ectoparasites specimens, processing and specimens identification. The data analysis was done descriptively and tabulated with the degree of infestation. The kinds of ectoparasites from the class of insects found in the body of Spotted dove were Goniocotes sp. and Columbicola columbae of phthiraptera order and Pseudolynchia canariensis of diptera order, and arachnida class, that is, tungau from the pterolichidae family. In terms of ectoparasites, Spotted dove and Javan turtle dove were similar, except that Javan turtle dove had no Pseudolynchia canariensis. Goniocotes sp. and Columbicola columbae were mallopaga order (biting lice) and were obligate. The kinds of parasitic insects in the vicinity of Spotted dove and Javan turtle dove cages were from the Ordo Diptera. The diptera classified as parasites included Anopheles, Culex, Psychodidae, Culicoides and Simulium, most of them vectors of disease. The presence of ectoparasites was closely related to how a breeding place is managed.
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