Judul: Uji Kinerja Pemanasan Udara Sistem Pengering Mikrokogenerasi.
Abstrak: Pengeringan merupakan salah satu penanganan pascapanen yang penting untuk mempertahankan kualitas gabah. Pengeringan dengan sistem pengering mikrokogenerasi diharapkan mampu mengonsumsi energi yang lebih hemat dibandingkan dengan pengering mekanis konvensional. Tujuan dari penelitian ini adalah menguji kinerja pemanasan udara dari sistem pengering mikrokogenerasi dan menganalisis konsumsi energi yang digunakan untuk menghasilkan kondisi suhu udara pengeringan optimal gabah. Sumber panas pada pengering berasal dari panas sistem HPKU, panas gas buang genset, panas dinding genset, dan panas heater. Pengujian sistem heater dilakukan pada tiga tingkat daya, yaitu pada daya 1 kW, 2 kW, dan 3 kW. Pengujian dilakukan dengan tiga variasi kondisi suhu selama 45 menit setiap satu kali pengujian. Panas yang dihasilkan dan konsumsi energi pada sistem HPKU dan sistem heater 1 kW hampir sama, sedangkan pada sistem heater 2 kW dan sistem heater 3 kW jauh lebih tinggi. Hasil pengujian menunjukkan kondisi suhu yang sesuai untuk suhu pengeringan gabah adalah sistem HPKU dengan suhu sebesar 43.3oC dan sistem heater 1 kW dengan suhu sebesar 42.8oC, keduanya pada kondisi suhu lingkungan 23-25oC. Sistem HPKU dan sistem heater 1 kW mengonsumsi listrik dan bahan bakar yang lebih sedikit, sehingga lebih efisien untuk digunakan dalam mencapai suhu pengeringan gabah dibandingan dengan sistem heater 2 kW dan sistem heater 3 kW.
Keyword: gas buang, genset, heat pump kompresi uap, heater, mikrokogenerasi

Judul: Pengaruh Konfigurasi Aliran Udara Terhadap Kinerja Sistem Pengering Mikrokogenerasi
Abstrak: Mikrokogenerasi merupakan sistem yang dapat memproduksi dua bentuk energi secara bersamaan. Energi yang paling umum diproduksi menggunakan sistem kogenerasi adalah energi listrik dan energi termal. Penelitian ini bertujuan untuk menentukan parameter-parameter yang mempengaruhi kinerja alat pengering mikrokogenerasi, serta menganalisa kinerja pengering mikrokogenerasi. Penelitian dilakukan dengan memvariasikan bukaan aliran udara pada saluran udara masuk genset dan saluran udara masuk heat exchanger, menggunakan plat besi berlubang. Selain itu, pengujian juga dilakukan dengan adanya perbedaan suhu lingkungan dan penggunaan heater. Hasil menunjukkan bahwa perbedaan konfigurasi aliran udara berpengaruh pada efisiensi energi total yang berada pada rentang 60 hingga 87%. Data menunjukkan udara yang dihasilkan alat pengering mikrokogenerasi berpotensi untuk mengeringkan gabah dan rempah, yaitu dengan suhu berada pada rentang 32 hingga 46°C, laju aliran massa udara keluaran blower pada rentang 0.737 hingga 0.974 kg/s dan persentase panas yang berasal dari dinding genset lebih dari 90%. Hasil penelitian juga menunjukkan bahwa dengan lebih banyak menyalurkan udara melalui saluran heat exchanger menghasilkan efisiensi energi yang lebih baik, yaitu pada rentang 73 hingga 87%, sedangkan dengan laju aliran udara yang lebih rendah pada saluran heat exchanger menghasilkan efisiensi energi pada rentang 60 hingga 72%. Selain itu, data juga menunjukkan bahwa adanya perbedaan suhu lingkungan tidak berpengaruh banyak pada efisiensi energi total., Micro-cogeneration is a system that can produce two forms of energy simultaneously. The most common energies produced using cogeneration systems are electricity and thermal energy. This study aims to determine the parameters that affect the performance of the micro-cogeneration dryer and to analyze the performance of the micro-cogeneration dryer so as to produce the optimum drying air. The research was conducted by varying the airflow openings at the inlet of the generator and the air inlet of the heat exchanger using a perforated iron plate. In addition, testing was also carried out with differences in ambient temperature and the use of heaters. The results show that different airflow configurations affect the total energy efficiency which is in the range of 60 to 87%. The data shows that the air produced by the micro-cogeneration dryer has the potential to dry grain and spices, with temperatures in the range of 32 to 46°C, the mass flow rate of the blower output air in the range of 0.737 to 0.974 kg/s and the percentage of heat coming from the generator wall is more than 90%. The results also show that by channeling more air through the heat exchanger channel, it produces better energy efficiency, which is in the range of 73 to 87%, while with a lower air flow rate in the heat exchanger channel, it produces energy efficiency in the range of 60 to 72%. . In addition, the data also shows that the difference in ambient temperature does not have much effect on the total energy efficiency.
Keyword: generator set, mikro-kogenerasi, panas buang, penukar panas

Judul: Morfologi dan filogeografi of Clavularia inflata Schenk, 1896 Schenk, 1896 (Karang Lunak: Stolonifera) in daerah pesisir Indonesian
Abstrak: The Coral Triangle is recognized as the center of the world’s marine biodiversity, with species richness declining gradually from this region to the east across the Pacific Ocean and west across Indian Ocean. This region covers many countries, such as Indonesia, Malaysia, Philippines, Brunei, East Timor (Timor Leste), Papua New Guinea, and Solomon Islands. There are around 96 genera and 23 families of soft coral in the Indo-Pacific. In Indonesia around 219 species, 28 genera, and 4 families of soft corals have been recorded. Clavularia is spread widely throughout the Indian and Pacific Ocean, stretching from the Red Sea and East Africa across the Indo-Pacific, reaching as far east as Micronesia. Clavularia is stoloniforous zooxanthellae soft coral, each one of the polyps is connected to the base. Polyps are pink to brownish gray and about 30 mm in diameter. Stolons are brown to dark red, and are often covered with algae or sponges. Genetic connectivity is the key of conservation because it plays important roles in maintaining populations and the potential for restoring damage to the marine environment. The connectivity patterns of sessile animals are affected by reproduction and larval spread. The stage of pelagic larvae is the initial stage of life for recruitment, so that it can maintain its population from extinction. Besides, the pattern of genetic connectivity can help in designing management plans for marine protected areas, which in turn can help to preserve biodiversity. Genetic connectivity between coral reefs is often overlooked when designing an area, but it is very important to ensure the continuity of populations or protection of biodiversity. This study aimed to confirm the identity of 25 colonies collected from 13 Indonesian coral reef location putatively identified as Clavularia inflata using molecular tools, and to describe them morphologically to verify defining characteristics and describe their morphological plasticity. Specimens were morphologically described based on their sclerite characteristics and compared between sites. All specimens were confirmed as Clavularia inflata by molecular identification using mitochondrial DNA with the mtMuts gene. Sclerite observations were divided into four parts for each colony, namely pinnules (finger-like extensions along the tentacless sides), crowns (tentacles covering the upper side of polyps, located between tentacles and calyx), calyx (the middle part of polyps), and stolons (branching between polyps). The form of sclerites found in Clavularia inflata comprised various forms such as rods, fingers, sticks, and brackets. The shortest size sclerites were found in the pinnule. These sclerites had a variety of sclerites such as grains with various geometric shapes such as platelet or finger biscuit shape. In the crown, the form of sclerites found was spindle-shaped sclerites (oval shaped with a shaft in the middle) with a curved shape. The middle part of the polyp (the calyx) is mostly covered by rod-shaped sclerites. Morphometric measurements of Clavularia inflata showed specimens from Kepulauan Seribu, Jakarta had the largest pinnule, calyx, and stolon compared to other locations. The maximum mean length of pinnule, calyx, and stolon were 145.1±19.27 µm, 1605.6±30.58 µm, and 749.5±52.8 µm, respectively. The maximum mean length of crown was 672,6±39.58 µm, found in Maluku
Keyword: Alcyonacea, Coral triangle, Molecular taxonomy, Phylogeography, Population genetics