Judul: Morfometri Kumbang Penyerbuk Kelapa Sawit (Elaeidobius kamerunicus Faust)
Abstrak: Pollination of oil palm mediated by wind or weevil. E. kamerunicus is an effective pollinator of oil palm. The purpose of this research was to analyze the morphometry of E. kamerunicus as oil palm pollinators. Weevils samples were collected in four regions in West Java and Banten, i.e. Rangkasbitung, Sukabumi, Cianjur, and Jasinga. Two hundreds individual of weevil were collected in each location consisted of 100 males and 100 females. Measurement of body part of E. kamerunicus were conducted on 11 characters using Raster Image software. Body measurements were tested by ANOVA and post hoc test with Tukey using R software. Male and female weevils of E. kamerunicus have different body sizes in each location. Mean of total length of male weevils was 3,443 mm (2274-4202 mm), total body width was 1,385 mm (1099-1700 mm) and abdomen height was 1.044 mm (0.798-1.328 mm). Mean of total lenght of female weevil was 3,046 mm (2008-3825 mm), total body width was 1,245 mm (1026-1482 mm) and abdomen height was 0.956 mm (0.756-1.196 mm). Total body length of weevil was largest in Cianjur followed by weevils in Jasinga, Rangkasbitung, and Sukabumi.
Keyword: Bogor Agricultural University (IPB), pollination, morphometry, oil palm, Elaeidobius kamerunicus

Judul: Demografi Kumbang Penyerbuk Kelapa Sawit, Elaeidobius kamerunicus (Coleoptera : Curculionidae)
Abstrak: Oil palm is a specific host plant for the weevil E. kamerunicus. These weevils can only eat, lay eggs, and breed in oil palm male flowers. This study aimed to study demographics of E. kamerunicus as oil palm pollinators, such as biology, life table, and the survivorship. A pair of E. kamerunicus were reared in the box contained male flowers spikelet. At the base of spikelet were immersed by water at film bottle. Body and sex ratio were observed during development of egg to adult. Demographic study were analyzed based on gross reproductive rate (G), net reproductive rate (R0), generation time (T), and intrinsic growth rate (r). In average life cycle of E. kamerunicus was 33 days i.e. 2.5 days of egg, 12 days of larvae, 5 days of pupae, and 15 days of male and 18 day of female adult, respectively. Demography of the weevil were: gross reproductive rate was 6 individuals, net reproductive rate was 3 individuals, generation time was 15 days, and intrinsic growth rate was 0.06. In a life cycle, fecundity of E. kamerunicus was 27 eggs and mortality from egg to adult was 72.9%. Based on the survivorship curve, mortality in early phase was constant and increase at adult phase.
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Judul: Effects of NaMnN2 Material Phase Differences on the Properties and Performance of Sodium Ion Battery Cathodes
Abstrak: Kemajuan teknologi menyebabkan kebutuhan akan baterai isi ulang meningkat. Namun baterai ion litium sebagai baterai yang umum digunakan mengalami kenaikan harga yang tinggi karena kelangkaan litium di alam. Baterai ion natrium sebagai baterai alternatif dari baterai ion litium belum menemukan kandidat material katoda yang tepat. NaMnN2 dari keluarga Layered N-based TMDs-like diharapkan dapat menjadi material katoda baterai ion natrium yang murah dan baik. Density Functional Theory digunakan dalam penelitian ini untuk membuktikan pengaruh fasa terhadap sifat elektronik dan performansi material katoda NaMnN2, sehingga dapat diperoleh fasa terbaik bagi keluarga Layered N-based TMDs-like sebagai katoda baterai ion natrium. Hasil penelitian menunjukan bahwa secara teoretis NaMnN2 berpotensi sebagai katoda baterai ion natrium yang memiliki performansi baik. Selain itu, NaMnN2 fasa 2H memiliki keunggulan pada kestabilan siklus, memiliki konduktivitas yang sangat baik, serta mengalami difusivitas ion Na yang baik dengan energi penghalang sebesar 0,41 eV. Material NaMnN2 fasa 1T unggul dalam tegangan yang lebih tinggi, mencapai 3,93 V, serta memiliki rapat energi yang besarnya mencapai 995,22 Wh/kg., Technological advancements have caused the need for rechargeable batteries to increase. However, lithium ion battery as a commonly used battery has experienced a high price increase due to the scarcity of lithium in nature. Sodium ion battery as an alternative battery to lithium ion battery has not found the right cathode material candidate. NaMnN2 from the Layered N-based TMDs-like family is expected to be a cheap and good sodium ion battery cathode material. Density Functional Theory is used in this study to prove the effect of phase on the electronic properties and performance of NaMnN2 cathode material, so that the best phase can be obtained for the Layered N-based TMDs-like family as a sodium ion battery cathode. The results showed that theoretically NaMnN2 has the potential as a cathode of sodium ion battery which has good performance. In addition, 2H-phase of NaMnN2 has advantages in cycle stability, has excellent conductivity, and experiences good sodium ion diffusivity with a barrier energy of 0,41 eV. The 1T phase NaMnN2 material excels in higher voltages, reaching 3,93 V, and has an energy density of up to 995,22 Wh/kg.
Keyword: cathode, DFT, phase, Quantum Espresso, SIB