Judul: Keanekaragaman dan kelimpahan artropoda pada pertanaman bawang daun dan wortel yang ditanam secara monokultur dan tumpangsari
Abstrak: Green onion is a seasonal crop with ecological conditions that are frequently changed. This makes unstable condition between populations of pests and natural enemies (predators, parasitoids and pathogens). Brief observations in the field found that pest infestations on carrot fields were frequently low. Results of several studies indicated that carrot could attract parasitoids of insect pests. The objective of this research was to study the diversity and abundance of arthropods on green onion and carrot grown in monoculture and intercropping. Experiment with four treatments and four replications was set in randomized complete block design. The treatments were: P1) green onion grown in monoculture; P2) green onion sprayed with carrot leaf extract; P3) green onion and carrot grown in intercropping; and P4) carrot grown in monoculture. Observations of arthropods were conducted by setting pitfall traps and yellow sticky traps weekly. Collected arthropods were identified by using Introduction to The Study of Insects, Insects of Australia, and Hymenoptera of The World. Data were analyzed with Shanon- Wienner index, and analysis of variance by using Minitab 17. The result indicated that the culture system of green onion and carrot did not affect diversity of arthropods for the whole season. The arthropod community on green onion and carrot was dominated by Liriomyza spp. (Diptera: Agromyzidae), ants (Hymenoptera : Formicidae), and Collembola.
Keyword: Bogor Agricultural University (IPB), intercropping., green onion, diversity, carrot, Arthropods

Judul: Kelimpahan Dan Keanekaragaman Artropoda Predator Serta Artropoda Lainnya Pada Tanaman Jeruk Di Cikarawang, Kabupaten Bogor
Abstrak: Jeruk merupakan salah satu komoditas hortikultura yang paling banyak dikonsumsi di Indonesia. Produksi jeruk mengalami penurunan setiap tahunnya. Hama merupakan salah satu faktor yang menyebabkan penurunan produksi jeruk. Informasi kelimpahan dan keragaman predator dan Artropoda dengan lainnya di perkebunan jeruk adalah persyaratan dasar untuk menerapkan pengendalian hama terpadu (PHT). Penelitian ini bertujuan untuk inventarisasi Artropoda predator dan Artropoda lainnya di perkebunan jeruk Cikarawang, Kabupaten Bogor. Kelimpahan dan keragaman Artropoda diamati menggunakan metode pitfall trap, jaring serangga, light trap, dan pengamatan langsung selama 12 minggu penelitian. Artropoda yang ditemukan dari kelas Arachnida (2 ordo, 18 famili, dan 1 687 spesies), Malacostraca (1 ordo, 1 famili, 12 spesies), Diplopoda (2 ordo, 2 famili, dan 5 spesies) dan Insecta (13 ordo, 102 famili , dan 10 870 spesies). Proporsi herbivor, predator, parasitoid, detrivor, dan lainnya 60%, 25%, 3%, 11%, dan 1%. Predator yang paling banyak ditemukan pada lahan pertanaman jeruk di Cikarawang, Kabupaten Bogor berturut-turut adalah adalah Formicidae, Oxyopidae, Coccinellidae; herbivor adalah Psyllidae, Tetranychidae, Gracillariidae; detrivor adalah Isotomidae, Entomobryiidae, Sminthuridae; dan parasitoid adalah Eulophidae dan Encyrtidae.
Keyword: Arthropoda, jeruk, kelimpahan, keragaman, predator

Judul: Analysis of NaTFSA Electrolytes on Sodium Ion  Batteries Using the DC-DFTB-MD Method
Abstrak: Pelarut air digunakan dalam sistem elektrolit NaTFSA pada baterai ion natrium karena sifatnya yang relatif aman. Namun, menghasilkan tegangan yang cukup rendah sehingga memiliki keterbatasan dalam pengaplikasiannya. Untuk mengatasi hal tersebut dikembangkan elektrolit berkonsentrasi tinggi. Pada penelitian ini, pengaruh konsentrasi elektrolit NaTFSA terhadap sifat struktur, dinamika, dan elektronik dianalisis menggunakan metode dinamika molekul pada level mekanika kuantum. Analisis mikroskopik struktur dan dinamika elektrolit NaTFSA menunjukkan bahwa seiring kenaikan konsentrasi, koefisien difusi air menurun sedangkan konduktivitas elektrolit cenderung meningkat sebanding dengan mobilitas ion-ion., The aqueous solvent is used in the NaTFSA electrolyte system in sodium ion batteries because it is relatively safer. However, the voltage window of the sodium ion battery is narrower than that of the lithium ion battery, thus it still limits its practical implementation. To overcome this problem, a high concentration of electrolyte was developed. In this present work, the salt concentration effect on structural, dynamic and electronic properties were analyzed using molecular dynamics methods at the quantum mechanical level. Microscopic analysis of the structural and dynamical properties of the NaTFSA electrolyte showed that as the concentration increased, the water diffusion coefficient decreased while the electrolyte conductivity tended to increase.
Keyword: Conductivity, DC-DFTB, Diffusion constants, NaTFSA electrolytes, Sodium ion batteries