Judul: Preferensi Burung Hantu Celepuk Reban (Otus lempiji Horsfield) terhadap Umpan
Abstrak: One of the essential plantation commodities is oil palm. There are some constrains faced by oil palm growers, one of them is tree rat (Rattus tiomanicus Miller). The rat has a high reproduction capability and can damage crops of oil palm. An effective and environmentally friendly control, using natural enemies, especially owl is needed to solve this problem. The sunda scops-owl (Otus lempiji Horsfield) was tested with several different types of bait to see the level of preference of bait. The method used is a bi-choice test. In this test, there are four treatments, i.e. rat with larvae of beetle, rat with lizard, rat with fish, and rat with cricket. Before and after treatment, the bait was weighed to determine the amount of feed consumed. The data show a significant difference in results between rat with different baits. The sunda scops-owl consumption in rat is higher than larvae of beetle, lizard, fish, and cricket.
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Judul: Utilization of Owls (Tyto alba Sco.) in Rice Field Rat Control (Rattus argentiventer Rob. & Kloss) in Guntur District, Demak Regency
Abstrak: Serangan tikus sawah (Rattus argentiventer) tersebar hampir seluruh wilayah persawahan padi di Indonesia pada setiap stadia pertumbuhan, baik vegetatif maupun generatif. Berbagai pengendalian telah dilakukan yaitu pengumpanan beracun, pengasapan (pengemposan), perburuan (gropyokan), dan penyetruman. Namun, semua pengendalian ini belum efektif dalam mengendalikan tikus sawah sehingga perlu adanya suatu inovasi pengendalian yang ramah lingkungan dan aman digunakan yaitu penggunaan musuh alami hama tikus berupa burung hantu (Tyto alba). Penelitian ini bertujuan mengetahui pemanfaatan burung hantu (T. alba) terhadap pengendalian tikus sawah (R. argentiventer) dari aspek ekologi, ekonomi, dan sosial di Kecamatan Guntur, Kabupaten Demak, Jawa Tengah. Penelitian dilakukan pada bulan Agustus sampai Oktober 2022 dengan melakukan survei langsung menggunakan kuesioner terstruktur dan pengamatan lapangan. Lokasi pengambilan sampel dan penentuan responden menggunakan metode Purposive Sampling dengan jumlah responden sebanyak 30 orang. Hasil penelitian menunjukkan pemanfaatan T. alba efektif dalam mengendalikan tikus yang terlihat pada aspek ekologi, ekonomi, dan sosial. Burung hantu mampu memangsa tikus sawah 3-5 ekor dalam satu malam dan meningkatkan hasil produksi pertanaman padi dengan R/C Ratio sebesar 1,16 dan B/C Ratio sebesar 3,3 sehingga pengendalian menggunakan burung hantu layak untuk dikembangkan. Keberhasilan pengendalian tikus sawah menggunakan T. alba di Kecamatan Guntur didukung pengadaan rubuha (rumah burung hantu) dan adanya kolaborasi stakeholders dengan kebijakan berupa peraturan tertulis.
Keyword: natural enemies, rice production, rubuha

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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