Etnobatani Masyarakat O Hongana Ma Nyawa di Desa Wangongira, Kabupaten Halmahera Utara

O hongana ma nyawa is a community who used to live nomadically in the Forest of Halmahera Island by hunter and gather. Most of them have been resettled by the Indonesian government. Ethnobotany research to analyse the diversity of plants used by those community who live in Wangongira village, North Halmahera regency, was conducted on April to Mai 2015. A total of 153 used plant species of 54 families are identified, most of them are wild plants and taken from the forest. Most of the plants species used that are coming from the forest show their high knowledge of forest products nevertheless they have been resettled for years

Moisture Content and Absorption Levels of Carbon Dioxide in Binuang Bini (Octomeles sumatrana Miq) Trees For Climate Change Management

Binuang bini (Octomeles sumatrana Miq) is a fast-growing tree with numerous economic benefits, such as the provision of wood for carpentry purposes, building boards, water management, and absorption of carbon dioxide (CO2). Therefore, this tree species has great potential and needs to be included in Reducing Emission from Deforestation and Forest Degradation (REDD)+'s mitigation program to tackle climate change. In its development, REDD+ has made it possible to carry out carbon trading in the world. Therefore, countries capable of performing protective functions and carry out reforestation, afforestation, and restoration, have the opportunity to be involved in world carbon trading. This study aims to determine the moisture content and carbon absorption rate of Binuang bini trees as a first step to regulate the allometric equation using destructive and laboratory analysis. The results show that the water content in the roots, leaves, as well as the base, middle, and tip of the stem were: 73.69%, 68.39%, 65.59%, 61.22%, and 66.26%, respectively. Furthermore, the sample test results indicate a very close relationship between carbon concentration and absorbance in the O. sumatrana tree with a simple linear regression equation: Y = 0.002X + 0.0593 with R2 = 0.9896. Therefore, this regression equation can be used to calculate the carbon concentration sample for the O. sumatrana tree fraction. The carbon content in 3 tree samples with a breast height diameter of 9.24 cm, 10.08 cm, and 11.68 cm was 2,585 kg. 2,913 kg, and 4,654 kg, respectively. In addition, the carbon sequestration for each tree diameter per year is 1.581 kg year-1, 1,782 kg year-1and 2,847 kg year-1, respectively

Studi Numerik Aliran Fluida Melewati Diffuser Dengan Variasi Bentuk Dan Bilangan Reynolds Untuk Aplikasi Inlet Duct HRSG

Fluida merupakan suatu hal yang penting maka penelitian mengenai karakteristik fluida dan pengendalian karakteristik fluida sangat penting dilakukan. Diffuser merupakan salah satu konstruksi yang dapat mengendalikan perilaku dari fluida, salah satu aplikasi dari diffuser adalah inlet duct pada HRSG (Heat Recovery Steam Generator). Pada HRSG aliran setelah melewati inlet duct diharapkan dapat memiliki kecepatan aksial yang uniform, namun dalam operasinya aliran yang keluar dari inlet duct belum mencapai kecepatan yang uniform. Maka diperlukan upaya yaitu dengan memvariasikan bentuk diffuser yang akan diaplikasikan pada inlet duct. Penelitian ini bertujuan untuk membandingkan kontur kecepatan, kontur tekanan, streamline, root mean square (RMS), pressure recovery coefficient (Cpr), dan pressure loss coefficient (K) dari empat model bentuk diffuser dengan penambahan porous medium pada jarak 3229 mm dari outlet diffuser, dimana masingmasing diffuser memiliki panjang yang sama sebesar 8400 mm. Empat model tersebut diantaranya asymmetric diffuser (θ1=62,66ᵒ, θ2=0ᵒ), asymmetric diffuser dengan satu sudden enlargement (θ1=30ᵒ, θ2=3,4ᵒ), symmetric diffuser (2θ=88,08ᵒ), dan symmetric diffuser dengan dua sudden enlargement (2θ=33,4ᵒ). Penelitian ini menggunakan tiga bilangan Reynolds yaitu Re1 = 8 x 105, Re2 = 1,6 x dan Re3 = 3,2 x ii berdasarkan kecepatan freestream memasuki upstream channel pada diffuser dengan metode numerik 3 dimensi steady flow menggunakan software STAR-CCM+ dengan model turbulensi realizable k-epsilon. Hasil yang diperoleh dari penelitian menunjukkan bahwa model 3 merupakan model yang paling optimum karena memiliki kecepatan yang paling uniform ditunjukkan nilai RMS yang paling rendah, performa diffuser yang paling baik ditunjukkan dengan nilai pressure recovery coefficient (Cpr) yang paling tinggi dan memiliki nilai pressure loss coefficient (K) yang paling rendah. Kenaikan bilangan Reynolds tidak berpengaruh signifikan terhadap nilai RMS, Cpr dan K pada keempat model. ========================================================================================================= Fluid is an important thing in this world, the research about fluid, characteristic of fluid and how to control the characteristic of fluid important to do. Diffuser is one of construction which can control of fluid. One of application of diffuser is inlet duct HRSG (Heat Recovery Steam Generator). In HRSG the flow after through the inlet duct epected has uniform aial velocity, but in operation the flow which left from inlet duct has not uniform flow. So need some action to make the uniform flow, one of the action make the shape variation of diffuser in inlet duct HRSG. The aims of this research is comparing of velocity contour, pressure contour, streamline, root mean square (RMS), pressure recovery coefficient (Cpr) and pressure loss coefficient (K) distribution of four models of shape diffuser with adding porous medium at 3229 mm after outlet diffuser, which have same long of diffuser 8400 mm, four models are asymmetric diffuser (θ1=62,66ᵒ, θ2=0ᵒ), asymmetric diffuser with one sudden enlargement (θ1=30ᵒ, θ2=3,4ᵒ), symmetric diffuser (2θ=88,08ᵒ), and symmetric diffuser with two sudden enlargement (2θ=33,4ᵒ). This research used three Reynolds number are Re1 = 8 x 105, Re2 = 1,6 x and Re3 = 3,2 x based on free stream velocity through upstream channel of diffuser with numeric method 3 iv dimension steady flow using STAR-CCM+ software with realizable k-epsilon turbulence model. The results of this research that model 3 symmetric diffuser with two sudden enlargement (2θ=33,4ᵒ) is an optimum model, because model 3 has uniform axial velocity with the lowest RMS, the best diffuser perform with the highest Cpr and has the lowest pressure loss coefficient. Increasing Reynolds number has not significant effect towards to RMS, Cpr and K for the four models

ETNOBATANI MASYARAKAT O HONGANA MA NYAWA DI DESA WANGONGIRA, KABUPATEN HALMAHERA UTARA

O hongana ma nyawa is a community who used to live nomadically in the Forest of Halmahera Island by hunter and gather. Most of them have been resettled by the Indonesian government. Ethnobotany research to analyse the diversity of plants used by those community who live in Wangongira village, North Halmahera regency, was conducted on April to Mai 2015. A total of 153 used plant species of 54 families are identified, most of them are wild plants and taken from the forest. Most of the plants species used that are coming from the forest show their high knowledge of forest products nevertheless they have been resettled for years.  Keywords: ethnobotany, North Halmahera, O hongana ma nyawa, plant species diversity, utilization knowledg

Membangun Ekowisata Berbasis Perhutanan Sosial Di Desa Talaga Paca, Kabupaten Halmahera Utara

Talaga Paca Village has natural tourism potential such as lake, cave, forest and biodiversity. The existing of the natural wealth is inversely proportional to the economic welfare of the people who have a poverty rate of 75%. The community has not received the economic benefits from the beautiful nature around them. In 2019, the Ministry of Environment and Forestry gave an approval for the management of a state forest area of ​​865 ha during 35 years to Talaga Paca Village as part of the Social Forestry program. The Community Service (CS) Team of Halmahera University identified the main problem of the community was the inability to manage the tourism potential. The purpose of this CS is to implement the management of Talaga Paca ecotourism by the community so that they could receive the economic benefits for their welfare. The CS took place from April to October 2022. Through the collaboration of the parties, the CS has succeeded in improving the management of ecotourism by the community. At the moment, there have been tourist visits from within and outside the country so that the community has begun to receive economic benefits from ecotourism. </jats:p