Judul: The Quality of Eri Silkworm (Samia  cynthia ricini) Cocoon Progo and Joglo Strains in Maintenance under Optimum  Conditions
Abstrak: Industri tekstil turut menyumbang devisa dan produksi nasional. Industri tekstil menggunakan serat alam sebagai salah satu bahan baku, diantaranya adalah serat sutra. Kain sutra terbuat dari benang yang dihasilkan dari pengolahan kokon ulat sutra. Ulat sutra non-murbei yang baru ini berkembang di Indonesia yaitu ulat sutra eri (Samia cynthia ricini). Galur progo dan joglo merupakan galur baru S.c. ricini yang dibentuk menggunakan metode seleksi dan cocok dipelihara di iklim tropis seperti Indonesia. Penelitian ini bertujuan untuk menganalisis kualitas kokon ulat sutra S.c. ricini galur progo dan joglo pada pemeliharaan di kondisi optimum. Parameter yang diukur diantaranya suhu dan kelembapan lingkungan, konsumsi pakan, karakteristik kokon, morfometrik kokon, dan kualitas kokon. Data dianalisis dengan menggunakan uji-T. Hasil penelitian menunjukkan bahwa galur ulat sutra S.c. ricini yang berbeda menghasilkan kualitas kokon yang berbeda. Galur progo memiliki karakteristik kokon yang lebih unggul yang tercermin pada produksi kokon, bobot kokon utuh, bobot floss, bobot kulit kokon, dan bobot pupa.yang lebih baik jika dibandingkan dengan galur joglo., The textile industry contributes to foreign exchange and national production. The textile industry uses natural fibers as raw materials, including silk. Silk fabrics are made from threads produced by processing silkworm cocoons. The non-mulberry silkworm recently developed in Indonesia is the eri silkworm (Samia cynthia ricini). the progo and joglo strains are new strains of S.c. ricini that have undergone a selection process and are suitable for rearing in tropical climates such as Indonesia. This study aimed to analyze the cocoon quality of S.c. ricini from two strains, namely progo and joglo strains. Parameters that have been measured were temperature and humidity of the environment, feed consumption, cocoon characteristics, cocoon morphometry, and cocoon quality. The data were analyzed using T-test. The results showed that the strain differences of S.c. ricini can affect the quality of the cocoon produced. The progo strain has better cocoon production, intact cocoon weight, floss weight, cocoon skin weight, and pupa weight.
Keyword: cocon, joglo, progo, Samia cynthia ricini, tensile strength

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: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model