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 Productivity of Progo and Joglo Strains of Eri Silkworm (Samia cynthia ricini)
Abstrak: Ulat sutra eri S. c. ricini dari famili Saturniidae merupakan penghasil serat sutra yang digunakan sebagai bahan baku pembuatan kain. Genetika ulat sutra eri S. c. ricini dapat direkayasa untuk membuat galur-galur baru yang dapat dipelihara di lingkungan tertentu. Galur sintentik progo dan joglo dibentuk melalui metode seleksi dan persilangan yang dapat dipelihara di suhu panas dan kelembapan rendah. Penelitian ini bertujuan untuk menganalisis produktivitas ulat sutra eri S. c. ricini galur progo dan joglo pada kondisi optimum. Perbedaan produktivitas keduanya dianalisis dengan menggunakan metode uji-T. Peubah yang diamati antara lain suhu dan kelembapan, konsumsi pakan, panjang, lebar, dan bobot tubuh ulat sutra, lama fase ulat, mortalitas, dan produktivitas kokon. Hasil penelitian menunjukkan bahwa galur progo memiliki hasil yang lebih tinggi pada parameter konsumsi pakan, panjang, lebar, dan berat larva, mortalitas, serta produktivitas kokon dibandingkan galur joglo. Perbedaan galur ulat sutra eri S. c. ricini memiliki pengaruh terhadap produktivitas yaitu pada peubah morfometrik dan produksi kokon., The eri silkworm S. c. ricini from Saturniidae is a silk fiber producer used as a raw material for making cloth. The genetics of the eri silkworm of S. c. ricini can be fabricated to make new strains that can be maintained in a specific environment. The progo and joglo strain was created through selection methods and crossbreeding that can be maintained in hot temperatures and low humidity. This study aimed to determine the productivity of the progo and joglo strains under optimum conditions. The differences in their productivity were evaluated using the T-test method. Parameters observed included temperature and humidity, feed consumption, larval body length, width and weight, length of silkworm phase, mortality, and cocoon. The results showed that the progo strain had higher results in the parameters of feed consumption, larval length, width, weight, mortality, and cocoon productivity than the joglo strain. The differences strain of eri silkworm S. c. ricini had an effect on productivity on morphometric variables and cocoon production.
Keyword: joglo, productivities, progo, Samia cynthia ricini, strain, galur, joglo, produktivitas

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