Judul: The Development of Community Forest Research in Indonesia: Bibliography Review
Abstrak: Hutan rakyat di Indonesia memiliki peranan penting dalam menyangga keberlangsungan hidup masyarakat. Ilmu pengelolaan hutan rakyat diperlukan dalam mewujudkan pengelolaan hutan yang lestari. Namun, ilmu pengelolaan hutan rakyat masih relatif muda jika dibandingkan dengan ilmu pengelolaan hutan (forest management) yang diperuntukkan guna mengelola hutan-hutan luas dan masif. Oleh karena itu, penting untuk diketahui sejauh mana perkembangan ilmu pengelolaan hutan rakyat yang telah dilakukan melalui berbagai penelitian selama ini. Tujuan penelitian ini adalah memetakan perkembangan penelitian di hutan rakyat dari tahun ke tahun meliputi lokasi penelitian, publikasi, tema, dan subtema mulai dari tahun 2013-2023 serta mengetahui kesesuaian antara teori dan praktik pengelolaan hutan rakyat. Penelitian dilakukan menggunakan tinjauan bibliografi dan dianalisis secara deskriptif kualitatif serta anotasi bibliografi. Hasil penelitian menunjukkan bahwa penelitian hutan rakyat banyak dilakukan di Provinsi Jawa Barat, Kabupaten Bogor, publikasi Jurnal Penelitian Hutan Tanaman, dengan tema produksi dan sub-tema penanaman. Sebagian praktik di lapangan tidak menerapkan teori, sehingga pengelolaan hutan rakyat belum mencapai optimum., Community forests in Indonesia have an essential role in ensuring communities’ survival. The science of community forest management is necessary for achieving sustainable forest management. However, the science of community forest management is still relatively young compared to the forest management sciences intended to manage large and massive forests. Therefore, it is important to know to what extent the development of the science of community forest management has been through various studies over the years. The objective of this research is to map the development of research in the community forests from year to year, covering the location of research, publications, themes, and sub-themes starting from 2013-2023 as well as to find out the correlation between the theory and practice of community forest management. The research was conducted using bibliographic surveys and analyzed qualitatively descriptively, as well as an annotated bibliography. The research results show that a lot of community forest research is done in West Java Province, Bogor District, the publication of the Jurnal Penelitian Hutan Tanaman, with the themes of production and planting sub-themes. Some practices in the field do not apply theory, so community forest management has yet to reach optimum.
Keyword: community forest, anotasi bibliografi, hutan rakyat, pengelolaan hutan rakyat, annotated bibliography, community forest management

Judul: Trend Analysis of Legislation on Community forest in Indonesia
Abstrak: Peraturan perundang-undangan mengalami perubahan dari waktu ke waktu, namun tidak banyak yang mengatur mengenai hutan rakyat. Sehingga perlu dilakukan Analisis Trend peraturan perundang-undangan hutan rakyat. Penelitian ini dilakukan untuk menganalisis kesesuaian isi/substansi, hierarki, dan rencana tindak peraturan peraturan perundang-undangan mengenai hutan rakyat yang ada di Indonesia. Analisis Trend dilakukan dengan menggunakan perbandingan urutan peraturan perundang-undangan tentang hutan rakyat berdasarkan hierarki dari waktu ke waktu. Metode analisis perundang-undangan terdiri dari inventarisasi regulasi, identifikasi dan klasifikasi regulasi, analisis regulasi serta rencana tindak. Pengertian hutan rakyat menurut trend peraturan sebagian besar adalah hutan hak, namun saat ini terdapat pergeseran pengertian dari hutan hak ke hutan adat. Status hutan dalam pengurusan hutan rakyat adalah hak milik, namun ditemukan kemungkinan percampuran antara tanah milik dan tanah adat. Perencanaan hutan rakyat, pengelolaan hutan rakyat berhubungan dengan POAC (planning, organizing, actuating, dan controlling), serta pembahasan mengenai pemanfaatan dan perlindungan hutan rakyat belum banyak dibahas dalam peraturan perundang-undangan. Delapan pasal perlu direvisi pada peraturan yang dianalisis, selain pasal-pasal tersebut masih dipertahankan., The legislations change time to time, but there is not many that regulates community forests. So it is necessary to do a Trend Analysis of community forest legislations. This study was conducted to analyze the content/substance, hierarchy, and action plans of the legislations regarding community forests in Indonesia. Trend approach is carried out by using the order of laws and regulations on community forests based on a hierarchy from time to time. The method of analysis of the legislation consists of inventory of regulations, assessment and classification of regulations, analysis of regulations and plans. The definition of community forest according to regulatory trends is mostly private forest, but currently there is a shift in understanding from community forest to customary forest. The status of the forest in forest management mostly states that it is proprietary, but it is found that there is a possibility of a mixture of private land and customary land. Community forest planning, Community forest management related to POAC (planning, organizing, actuating, and controlling), and the discussion on the use and protection of community forests in the legislations has not been widely discussed. Eight regulations need to be revised in the analyzed regulations, besides that they are still maintained.
Keyword: Community forest, Legislation, Trend Analysis

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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