Judul: Identification of Subterranean Termites and Their Attack Characteristics on Settlements in DKI Jakarta Province
Abstrak: Serangan rayap pada bangunan semakin meningkat seiring dengan perkembangan pembangunan di Provinsi DKI Jakarta yang banyak mengubah kondisi lingkungan alaminya. Tujuan penelitian ini adalah untuk mengidentifikasi spesies rayap tanah yang menyerang bangunan gedung permukiman serta menganalisis karakteristik serangan rayap di Provinsi DKI Jakarta. Penelitian dilakukan pada 57 lokasi permukiman di Provinsi DKI Jakarta. Penentuan lokasi penelitian berdasarkan hasil survei kerusakan bangunan akibat serangan rayap dan kegiatan pemantauan aplikasi pengumpanan oleh PT Larusa Adi Sumindo selama empat bulan (September 2021-Desember 2021). Hasil identifikasi morfometri rayap ditemukan sekurang-kurangnya empat spesies rayap tanah yang menyerang bangunan yaitu Coptotermes curvignathus, Coptotermes gestroi, Macrotermes gilvus, dan Microtermes insperatus. Rayap C. gestroi merupakan spesies yang paling banyak ditemukan, yaitu di 39 lokasi. Hasil penelitian menunjukkan bahwa kerusakan komponen bangunan akibat serangan rayap dengan persentase tertinggi yaitu kusen jendela dan pintu (49,1%) dan terendah yaitu pondasi (3,5%)
Keyword: DKI Jakarta, building damage, morphometry, settlement, subterranean termites

Judul: Frekuensi dan Intensitas Serangan Rayap Tanah pada Bangunan Gedung milik Pemerintah Provinsi DKI Jakarta.
Abstrak: Jakarta is a province with the most developed infrastructure in Indonesia, including its building constructions. However, termites attack were often found on the buildings in this region. This study was conducted to investigate the frequency and intensity of termites attack on Jakarta Government’s buildings. The targeted buildings in this research were selected by four stage stratified random sampling technique. Termites speciemens were collected from attacked buildings, then identified according to (Ahmad 1958). The results of this research showed that the frequency of termites attack on Jakarta Government’s buildings reaches 16.67% with the degree of infestation could classified as light infestation. Compared to other building components, windows sills has the highest termites attack rate (14.58%), followed by door sills (8.34%), and roof truss (4.16%). In addition, Microtermes inspiratus Kemner (Isoptera: Termitidae) have been found as the most frequent termite species attacking the buildings in Jakarta Province with infestation frequency reaches 77.8%, followed by Coptotermes curvignathus Holmgren (Isoptera: Rhinotermitidae) with infestation frequency of 22.22%. The highest intensity of termites attack occurred in Cililitan Village, Subdistrict Kramat Jati, East Jakarta.
Keyword: buildings, Jakarta, termites

Judul: Model Input-output dalam Masalah Network Flow
Abstrak: Production process is a process, which is done by industry, to transform input into output. According to the type of output and its activity, industry can be classified into various sectors, which are connected to each other. Therefore, a model to analyze the connection among sections is needed. The model is known as input-output model (IO model). IO model presents an IO table, which shows informations about the transaction between goods and services in each economic sector. Furthermore, the IO model also shows that the amount of all input is the same as the amount of all output. In this paper, the transaction of each economic sector in IO table is analyzed using network flow theory. The formulated network flow problem implies that each sector represents partly as a producer and also as a consumer. This paper also solves a minimum cost circulation problem.
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