Judul: Dog Ticks Infestation and Its Correlation to Tick-Borne Diseases.
Abstrak: Ticks infestation on dog could lead to itchiness, anemia, skin disorders, and tick-borne diseases, such as Ehrlichiosis, Babesiosis, Anaplasmosis and Rocky Mountain Spotted Fever. Besides dogs, Ehrlichiosis were known to be zoonotic. Pre-mature stage tick life cycle that occur outside its host, will enhance contacts between ticks and human. The study of ticks infestation and tick-borne diseases on the dog is necessary, because it has not a lot of information about the diversity, prevalence and degree of ticks infestation in Indonesia. Ticks survey, included ticks sampling and dogs blood test were performed at Animal Police Directorate Security Agency (Baharkam) and Atang Sendjaja Air Force (ATS). Meanwhile ticks sampling also data of cases of ticks infestation and diseases transmitted obtained from 21 veterinary clinics in Bogor, Jakarta and Bandung. All ticks samples stored in bottles containing 70% alcohol for identification. Blood tests performed for Ehrlichiosis, Babesiosis and Anaplasmosis diagnosis. The identification results of the 950 ticks samples that obtained from 97 dogs of Baharkam, ATS and veterinary clinics in Bogor, Jakarta and Bandung, showed only one ticks species, Rhipicephalus sanguineus. This ticks belong to three-host tick, which require three hosts to complete its life cycle. Each ticks stage need a host, either same dog (if it is in place there is only one or a few dogs), as well as different dogs. Research in Baharkam conducted on 81 dogs (53 males and 28 females). The prevalence of dogs infested by ticks was 67.90%. The percentage of male dogs that infested by ticks are larger (69.81%) than female (64.29%). Based on Chi-Square test, there was no relationship between sex and breed of dog with degree of ticks infestation. Generally dogs infested with mild infestation category (41.98%), meanwhile moderate category was 18.52%, 2.47% high and 4.94% very high. The dog’s body region that the most infested by R. sanguineus was dog's back. Probably these body regions were be preferred because they are less accessible for the dog to remove them with its paws. Collection of ticks with tick-drag on Baharkam grass field showed positive results on the field that was more often used to practice by dogs. The samples that obtained was larvae stage ticks with density 152 larvae on 215m2 area of the field. Adult stage ticks and several adult females which laying eggs on the cage wall were obtained in the dog kennels. Whole of male and female ATS dogs infested with ticks (14 dogs). In general, dogs infested with very high infestation category was 64.29%, compared by high degree category (21.43%) and moderate (14.29%). Ticks predilection were found mostly on the dog’s head – neck. On ATS grass field did not reveal any ticks, but positively inside the kennels. It happens probably because dogs are rarely released from the kennel, so that the ticks was did drop-off inside the kennel. The total cases of ticks infestation of dogs at Bogor, Jakarta and Bandung veterinary clinics in 2008 until June 2013 as many as 731 cases. In general, there was an increases of the ticks infestation prevalence at three cities in that range
Keyword: Anaplasma, Babesia, Ehrlichia canis, Rhipicephalus sanguineus

Judul: The Infestation of Ticks (Acari: Ixodidae) on Dogs at Animals Hope Shelter Bogor
Abstrak: Caplak anjing berpotensi menimbulkan kerugian berupa penyebaran penyakit tular caplak baik pada hewan maupun manusia. Penelitian ini bertujuan mengidentifikasi spesies caplak yang menginfestasi anjing dan mengukur derajat infestasinya anjing yang dipelihara di Animals Hope Shelter Bogor. Koleksi sampel caplak dilakukan secara manual menggunakan pinset pada tubuh anjing yang dibagi menjadi lima regio, yaitu kepala dan leher, punggung, abdomen, ekor, serta kaki. Sampel dikoleksi dari 10 ekor anjing yang terinfestasi caplak selama lima menit pada setiap regio. Caplak di identifikasi dalam bentuk sediaan preparat kaca dengan kunci-kunci identifikasi caplak. Hasil penelitian menunjukkan bahwa hanya ada satu spesies caplak yang menginfestasi anjing di Animals Hope Shelter Bogor, yaitu Rhipicephalus sanguineus (Arachnida: Ixodidae). Infestasi caplak paling tinggi terjadi pada regio punggung dan kepala. Setengah dari populasi sampel anjing mengalami infestasi caplak ringan., Brown dog ticks potentially causes harm by transmitting Tick-Borne Diseases to both animals and humans. The aim of this research was to identified the species of tick that infested dogs and measured the infestation degree of ticks on dogs at Animals Hope Shelter Bogor. Ticks sample was collected manually by using tweezers from five regios of the dog’s body, which are head and neck, back, abdomen, tail, and foot. Sample was taken from 10 dogs that infested by tick for five minutes on each regio. Ticks identified in the form of mounted slide with tick identification keys. The result of this research showed that there was only one species that infested dogs at Animals Hope Shelter Bogor, that was Rhipicephalus sanguineus (Arachnida: Ixodidae). The highest number of ticks infestation was found at back and head regio. Half of the examined dog population had mild tick infestations.
Keyword: Anjing, caplak, Rhipicephalus sanguineus, shelter

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.
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