Judul: Pendekatan regresi kuadrat terkecil parsial kekar dalam pemodelan kalibrasi multirespon
Abstrak: Pada bidang kimia kandungan zat aktif dalam suatu bahan dapat ditentukan dengan berbagai alat, diantaranya adalah HPLC (High Performance Liquid Chromatography), FTIR (Fourier Transform Infrared) dan NIR (Near Infrared). Proses penentuan konsentrasi zat aktif dengan alat FTIR/NIR membutuhkan biaya dan waktu yang cukup lama. Untuk itu sangat diperlukan metode yang handal tetapi relatif mudah untuk digunakan. Salah satu metodenya adalah dengan membuat model kalibrasi.
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Judul: Penerapan Regresi Komponen Utama Kekar dan Regresi Kuadrat Terkecil Parsial Kekar dalam Pemodelan Kalibrasi Multirespon Kayu Jati
Abstrak: Calibration modeling is a method which often be used to estimate chemical contents of a material from measured spectra. The problems in calibration modeling are the number of independent variables larger than the number of observations, multicollinearity between independent variables, and outliers. RPCR and RSIMPLS are robust methods based on PCR (Principal Component Regression) and PLS (Partial Least Square) algorithms capable to solve those problems. A modified method of RPCR and RSIMPLS, called RPCR-M and RSIMPLS-M. They are alternative methods used weight in RPCR and RSIMPLS based on M-estimators with Huber weight function. Both modified methods are applied to multirespon data to estimate chemical contents of teak wood and compared. The results of validation and simulation showed that RPCR-M is better when the number of extreme outliers are less then two, whereas RSIMPLS-M is better and more stable when extreme outliers in the data are more then two.
Keyword: RSIMPLS-M, RPCR-M, robust method, multiresponse calibration

Judul: Prevalence of Bird Lice on Rock Pigeon (Columba livia) in 99Wonderland Park, Selangor, Malaysia
Abstrak: Rock Pigeon (Columba livia) have coexisted with humans for thousands of years and are used for various purposes such as food and in sports. Rock pigeons may have the potential to be infested with a wide range of ectoparasites, which can have a significant impact on their life cycle. This study aims to measure the prevalence of Columba livia with bird lice in 99Wonderland Park, Selangor, Malaysia in the year 2020 and to ascertain the impact of bird lice on the health of these infested birds. Data were collected from clinical records for the month of January to December in the year 2020 from 99Wonderland Park, Selangor, Malaysia. Lice were identified in 42 of the 80 Rock pigeons examined so, the overall prevalence of lice infestations was 52.5%. The prevalence of ectoparasites was found to be higher in young Rock pigeons (60.4%) as compared to adult Rock pigeons (37.4%). Columbicola columbae (wing lice) and Colpocephalum turbinatum (body lice) are two species of lice that have been detected. Body lice were more prevalent in young Columba livia birds at 47.6% whereas wing lice were more prevalent in adult Columba livia birds at 16.7%. Most of the lice were found in the thorax and abdomen area followed by the head and neck area., Merpati Batu (Columba livia) telah hidup berdampingan dengan manusia selama ribuan tahun dan digunakan untuk berbagai keperluan seperti makanan dan olahraga. Merpati batu dapat terinfestasi dengan berbagai ektoparasit, yang dapat berdampak signifikan pada siklus hidup mereka. Penelitian ini bertujuan untuk mengetahui prevalensi Columba livia dengan kutu burung di 99 Wonderland Park, Selangor, Malaysia pada tahun 2020 dan untuk memastikan dampaknya terhadap kesehatan burung yang terinfestasi. Data dikumpulkan dari catatan klinis dari bulan Januari hingga Desember tahun 2020 dari 99Wonderland Park, Selangor, Malaysia. Kutu diidentifikasi pada 42 dari 80 merpati batu yang diperiksa sehingga, prevalensi keseluruhan infestasi kutu adalah 52,5%. Prevalensi ektoparasit ditemukan lebih tinggi pada merpati batu muda (60,4%) dibandingkan dengan merpati batu dewasa (37,4%). Columbicola columbae (kutu sayap) dan Colpocephalum turbinatum (kutu badan) adalah dua spesies kutu yang telah ditemukan. Kutu badan lebih banyak ditemukan pada burung Columba livia muda sebesar 47,6% sedangkan kutu sayap lebih banyak ditemukan pada burung Columba livia dewasa sebesar 16,7%. Sebagian besar kutu ditemukan di daerah dada dan abdomen diikuti daerah kepala dan leher.
Keyword: Columba livia, prevalence, ectoparasite, wing lice, body lice, Columba livia, prevalensi, ektoparasit, kutu sayap, kutu badan