Judul: Incidence of Brucellosis on Cattle in Deli Serdang Regency North Sumatera Province in 2016-2019
Abstrak: Brucella abortus adalah agen penyebab yang paling sering menimbulkan penyakit Brucellosis pada sapi. Provinsi Sumatera Utara merupakan salah satu wilayah bebas Brucellosis. Tujuan studi kasus ini untuk mengetahui penyebaran Brucellosis pada peternakan sapi di Kabupaten Deli Serdang Provinsi Sumatera Utara. Studi ini menggunakan metode penelitian deskriptif dengan pendekatan analisis data sekunder yang diperoleh dari hasil monitoring dan surveilans Balai Veteriner Medan dan Dinas Pertanian Kabupaten Deli Serdang tahun 2016-2019. Hasil studi menunjukkan bahwa walaupun telah dinyatakan daerah bebas Brucellosis, masih ditemukan kasus positif di beberapa Kota/Kabupaten di Sumatera Utara, salah satunya di Kabupaten Deli Serdang. Seroprevalensi Brucellosis di Kabupaten Deli Serdang tertinggi pada tahun 2017 yaitu 9.41% (27/287) dan terendah 2.82% (7/248) pada tahun 2016. Berdasarkan lokasi, kasus Brucellosis tertinggi ditemukan pada Kecamatan Hamparan Perak. Faktor penyebab peningkatan kasus Brucellosis yaitu sistem pemeliharaan sapi secara semi intensif dan kegiatan lalu lintas ternak. Upaya pemberantasan yang dilakukan ialah pemotongan bersyarat., Brucella abortus is the causative agent that most often causes Brucellosis in cattle. North Sumatra Province is one of the Brucellosis-free areas. This study aims to know the spread of Brucellosis in cattle farms in Deli Serdang Regency, North Sumatra Province. This study used a descriptive research method with a secondary data analysis approach obtained from the results of monitoring and surveillance of Balai Veteriner Medan and Dinas Pertanian Kabupaten Deli Serdang 2016-2019. The results of the study show that even though the area has been declared free of Brucellosis, positive cases are still found in several cities/regencies in North Sumatra, one of which is in Deli Serdang Regency. The highest seroprevalence of Brucellosis in Deli Serdang Regency was in 2017, namely 9.41% (27/287) and the lowest was 2.82% (7/248) in 2016. Based on location, the highest cases of Brucellosis were found in Hamparan Perak District. Factors causing the increase in cases of Brucellosis are a semi intensive cattle rearing system and livestock traffic activities. The eradication effort carried out is test and slaughter.
Keyword: Brucella abortus, Brucellosis, Deli Serdang Regency

Judul: Study of Abortion In Dairy Cattle in KPSBU Lembang
Abstrak: Abortus merupakan penghentian masa kebuntingan yang mengakibatkan fetus keluar sebelum waktu kelahiran. Abortus pada ternak sering terjadi sehingga dapat mengurangi angka kelahiran ternak potensial, penurunan populasi ternak produktif, serta kerugian dari segi ekonomi. Penyebab abortus pada sapi perah disebabkan oleh berbagai faktor, faktor infeksi salah satunya yaitu Brucellosis. Sebanyak 30 spesimen swab vagina dari KPSBU Lembang hasil surveilans Balai Veteriner Subang digunakan untuk penelitian ini. Isolasi bakteri dengan kultur di Brucella agar dan biphasic. Kemudian dilakukan uji biokimiawi untuk mendeteksi genus Brucella sp. Identifikasi spesies Brucella abortus dengan metode Polymerase Chain Reaction (PCR) menggunakan primer IS711 Brucella. Hasil penelitian menunjukkan bahwa kejadian abortus yang terjadi tidak disebabkan oleh Brucella abortus, hal ini menunjukkan bahwa abortus diduga disebabkan oleh faktor infeksi patogen seperti bakteri Brucella canis, Brucella melitensis, Campylobacter foetus, dan Chlamdydia abortus. Penyebab infeksi protozoa yaitu Neospora caninum dan faktor non infeksi disebabkan oleh pakan yang terkontaminasi., Abortion is the termination of pregnancy that causes the fetus to come out before birth. Abortion in livestock often reduces potential livestock birth rates, decreases productive livestock populations, and causes economic losses. Abortion in dairy cattle is caused by various factors, one of which is infection Brucellosis. A total of 30 vaginal swab specimens from KPSBU Lembang is the surveillance of Balai Veteriner Subang used for this study. Bacterial isolation in Brucella agar and biphasic. Then a biochemical test to detect the genus Brucella sp. The polymerase chain reaction (PCR) method identifies Brucella abortus with primer IS711 Brucella. The results showed that the incidence of abortion was not caused by Brucella abortus, this indicated that the abortion was thought to be caused by pathogenic infections such as bacteria Brucella canis, Brucella melitensis,Campylobacter foetus, and chlamdydia abortus. The cause of protozoan infection is Neospora caninum and non-infectious factors are caused by contaminated feed.
Keyword: Abortion, Brucella abortus, Brucellosis, Dairy cattle, PCR

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: