Judul: Kualitas Kokon Ulat Sutra Eri (Samia cynthia ricini) yang Dipelihara dengan Pemberian Jenis Pakan Berbeda
Abstrak: Samia cynthia ricini atau ulat sutra eri merupakan ulat sutra non murbei, polivoltin dan telah didomestikasi serta dimanfaatkan kokonnya untuk diolah menjadi serat sutra. Tujuan penelitian ini mengevaluasi kualitas kokon dan serat ulat sutra eri yang dipelihara dengan taraf pemberian jenis pakan daun (Manihot utilissima dan Manihot glaziovii) yang berbeda. Penelitian ini menggunakan perlakuan pemberian dua jenis pakan dan dua taraf yang berbeda. Kedua taraf diberikan pada tiap instar. Taraf pakan pertama (P1) sebanyak 0,035; 0,129; 0,325; 2,410; dan 4,210 g ekor-1 hari -1. Taraf pakan kedua (P2) sebanyak 0,035; 0,129; 0,325; 3,910; dan 5,710 g ekor-1 hari -1. Kokon hasil pemeliharaan kemudian dilakukan karakterisasi dan degumming untuk memperoleh serat sutra. Penelitian ini menggunakan Rancangan Acak Lengkap pola faktorial 2x2. Data dianalisis menggunakan Analysis of Variance (ANOVA) dan dilanjutkan uji Tukey. Hasil penelitian ini menunjukkan bobot kokon utuh dan bobot pupa yang diberi pakan daun Manihot utilissima (ubi kayu) lebih tinggi dibanding bobot ulat yang diberi pakan daun Manihot glaziovii (singkong karet). Hal ini berkaitan dengan perbedaan nutrisi yang terkandung pada kedua jenis daun khususnya kandungan karbohidrat dan protein. Taraf pakan P1 menghasilkan diameter dan lingkar kokon anterior dan posterior yang lebih besar, yang akan memengaruhi bentuk kokon., Samia cynthia ricini or known as eri silkworm is a non mulberry, polyvoltin, and domesticated silkworm. Many people use the cocoon to proceed into silk fiber. The purpose of this research is to evaluate the quality of eri silkworm cocoon and silk fiber that being reared with different kind of feed (Manihot utilissima and Manihot glaziovii). Two different level and kind of feeds were used in this research. The feed level that used in this research were given to each instar. The first feed level (P1) were 0,035; 0,129; 0,325; 2,410; and 4,210 g each-1 day-1. The second feed level (P2) were 0,035; 0,129; 0,325; 3,910; and 5,710 g each-1 day-1. The cocoon, then beingcharacterized and degummed to get the silk fiber. Complete Randomized Designed with 2x2 factorial pattern was used in this research. Data were analyzed using Analysis of Variance (ANOVA) followed by Tukey test. The result showed that the cocoon weight and pupal weight were given with Manihot utilissima was higher than Manihot glaziovii. It related to the difference of nutrition that contained in each kind of leaf especially the protein and carbohydrate. Feed level P1 showed that the circumference of cocoon, anterior and posterior diameter were higher than P2 so it could affect the cocoon’s shape.
Keyword: cocoon, Manihot utilissima, Manihot glaziovii, Samia cynthia ricini, silk fiber

Judul: The Cocoon Quality of Eri Silkworm (Samia cynthia ricini) Jopati and Prasojo Strains at Optimum Environment Condition
Abstrak: Ulat sutra Samia cynthia ricini atau dikenal dengan ulat sutra eri (Lepidoptera: Saturniidae) berasal dari kelompok non murbei. Faktor yang memengaruhi kualitas kokon ulat sutra eri yaitu kondisi lingkungan, kualitas pakan serta genetik ulat. Berdasarkan sifatnya, dilakukan seleksi dan persilangan untuk mendapatkan galur baru yaitu galur jopati dan prasojo. Belum ada kajian terkait kualitas kokon ulat sutra eri galur jopati dan prasojo, maka penelitian ini bertujuan untuk menganalisis kualitas kokon ulat sutra eri galur jopati dan prasojo dengan pemberian pakan daun singkong (Manihot utilissima) di kondisi lingkungan optimum. Parameter yang diukur adalah suhu dan kelembapan lingkungan, karakteristik kokon, morfometrik kokon dan kualitas kokon. Data yang terkumpul dianalisis menggunakan uji-T. Hasil yang diperoleh dari penelitian ini ialah terdapat pengaruh genetik S. c. ricini galur jopati dan prasojo terhadap kokon yang dihasilkan. Kokon yang dihasilkan galur jopati dan prasojo memiliki kualitas yang berbeda pada parameter tertentu., Samia cynthia ricini silkworm, known as eri silkworm (Lepidoptera: Saturniidae), is from the non-mulberry group. Some factors affect the quality of the eri silkworm cocoon, precisely the environmental conditions, feed quality and genetic of the larvae. Based on its nature, selection and crosses were carried out to obtain new strains of the eri silkworm: jopati and prasojo. There has yet to be a study related to the quality of the cocoons of the jopati and prasojo, so this study aims to analyze the quality of the jopati and prasojo cocoon by feeding them with Manihot utilissima cassava leaves at optimum environment condition. Parameters that have been measured were temperature and humidity of the environment, cocoon characteristics, cocoon morphometry and cocoon quality. The collected data has been analyzed using the T-test. The results obtained from this research are genetic of S. c. ricini jopati and prasojo strains influences for its cocoon. The jopati and prasojo cocoon has different quality.
Keyword: cocoon quality, jopati, prasojo, Samia cynthia ricini

Judul: Pengembangan Sistem Rotasi Peta pada Perangkat Mobile tanpa Sensor Magnetometer
Abstrak: Due to the improvement of technology, the function of mobile phone has changed a lot. Nowadays, mobile phone is used not only for communication, but also to support the user’s activity. Many mobile phones now have Operating System (OS) and sensors like GPS and magnetometer. GPS is a sensor that can be used to identify any location, including the location of the user, while magnetometer can be used to identify direction. With data that come from GPS and magnetometer, we can build a navigation application that can rotate its map according to the rotation of the user. Meanwhile, in the Android Compability Definition Document point 1.6 until 2.2, Google have requirements for mobile phones to have GPS and magnetometer sensors if they want to use Android OS. But, since the release of 2.3.3 OS, Google has changed its requirements, allowing any mobile phones to have Android OS without having the magnetometer sensor. The objective of this research is to build an navigation application that can rotate without using magnetometer sensor. The value of the rotation degree is taken from last two position. To stabilize the value, Exponential Smoothing is used in filtering process. This system also use Haversine method to recognize whether the user is walking or driving/riding.
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