Judul: Uji Preferensi Pakan, Daya Adaptasi, dan Peranan Burung Gereja (Passer montanus L.) di Lingkungan Perkotaan dan Perdesaan
Abstrak: Burung gereja (Passer montanus L.) berpotensi sebagai hama dan predator. Burung gereja yang berada di perkotaan menimbulkan masalah karena kotoran, sarang, dan bulu yang masuk ke rumah, sedangkan di lingkungan perdesaan burung ini memakan serangga kecil dan biji-bijian seperti biji rumput-rumputan terutama pada area yang ditanamani tanaman padi. Penelitian ini bertujuan mengetahui tingkat konsumsi individu burung gereja terhadap gabah, pakan yang disukai oleh burung gereja, sera mengidentifikasi daya adaptasi, dan peranan burung gereja yang berpotensi sebagai hama dan predator di lingkungan perkotaan dan perdesaan. Penelitian mengenai uji kemampuan makan dan preferensi pakan dilakukan melalui persiapan kandang, persiapan pakan hewan uji, persiapan hewan uji, pengujian kemampuan makan, pengujian preferensi pakan, perhitungan tingkat konsumsi, konversi pakan, dan analisis data. Penelitian mengenai daya adaptasi dan peranan burung gereja dilakukan melalui penentuan lokasi, pengamatan langsung di lapangan, wawancara, studi pustaka, dan analisis data. Persentase konsumsi pada pengujian individu burung gereja terhadap gabah yaitu 10.12% atau 1/10 dari bobot tubuhnya. Jenis pakan yang paling disukai oleh burung gereja secara berturut-turut yaitu ulat hongkong, milet, jangkrik, jewawut, gabah, dan jagung. Burung gereja bukan hama pada tanaman padi. Burung gereja mampu beradaptasi dengan baik di lingkungan perkotaan maupun perdesaan karena lingkungan atau area terbuka (pohon, rumput dan sawah) dan terdapat rumah. Peranan burung gereja di perkotaan yaitu sebagai hama permukiman. Di perdesaan berpotensi sebagai hama pada tanaman milet dan jewawut. Burung gereja sebagai predator karena mengonsumsi serangga kecil (semut, belalang, jangkrik, ulat, dan kepik). Burung gereja dapat berperan sebagai hama dan predator.
Keyword: area terbuka, hama, konsumsi, predator, ulat hongkong

Judul: Keanekaragaman Jenis Burung pada Beberapa Cluster Perumahan di Sentul City, Bogor Jawa Barat
Abstrak: Sentul City held the eco-city concept and has a unique landscape with a variety of topography. This area has a variety of vegetation structure and composition which are distributed in several residential clusters. One of the biodiversity that can be found in this area is bird. Variety of habitat types will influence the bird diversity in each area (Blendinger and Ricardo 2001). The objective of this research were (1) to describe the habitat of birds, (2) to examine bird diversity, (3) to compare the bird composition among cluster types, (4) to examine vertical and horizontal distributions of birds in several vegetation and tree architecture, (5) to examine the influence of tree architecture on tree utilization by bird. The research was conducted in Sentul City from June to September 2011, in the area of research are five residential cluster which are selected by the age of cluster and composition of vegetation, and one location is a boulevard. The habitat condition and vegetation (dominant vegetation, tree height, type of tree architecture, vertical and architecture utilized side) are described with qualitative data and collected by direct survey. Bird data is collected by MacKinnon species list method (MacKinnon et al. 1998) with 10 species of birds each list. Bird diversity analyzed by using species area curve, meet frequence and index of similarity. Utilization of vegetation using descriptive analysis. A total of 42 species of bird from 24 families were recorded in this research. There were 6 species cannot find and 25 new species recorded compare by the result of AMDAL Bukit Sentul at 2000. The highest bird diversity found in Northridge cluster with 33 species of bird and the lowest bird diversity found in Venesia-Pasadena-Sakura cluster. Based on MacKinnon species list result, showed the leveled out of curve. It showed there was nothing increment of bird species at research location. Some of birds have a high number of meet frequence in one location, but cannot find in other location. It showed there was a low distribution of bird species. The highest similarity index was found between Bali cluster and Venesia-Pasadena-Sakura cluster (IS=0.76). In general, most of bird can be found at 2/3 of tree crown except in Argenia cluster. Midlde branching part of the tree crown are the most utilize part by bird. There are management method that can impelement, (1) provide and defence birds habitat, (2) planting a favourite vegetation for birds, (3) establish protected area for birds, (4) research on bird diversity in other locations, (5) intensively monitoring on bird diversity, (6) Sosialization in the importance of bird diversity, (7) develope an environmental education programs.
Keyword: 

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