KARAKTERISTIK UMUR PRODUK PADA MODEL WEIBULL

HYDRAULIC BEHAVIOR IN THE DOWNFLOW HANGING SPONGE BIOREACTOR Karakteristik Hidraulik pada Bioreactor Downflow Hanging Sponge

Performance efficiency in a Downflow Hanging Sponge (DHS) bioreactor is associated with the amount of time that a wastewater remains in the bioreactor. The bioreactor is considered as a plug flow reactor and its hydraulic residence time (HRT) depends on the void volume of packing material and the flow rate. In this study, hydraulic behavior of DHS bioreactor was investigated by using tracer met...

Euler-karakteristik for fusionskategorier

Dissolution test of various low-dose acetylsalicylic acid preparations marketed in Indonesia

Metode Studi disolusi dilakukan mengikuti Farmakope Amerika (USP)/Eropa, metode A, menggunakan alat 1 USP (keranjang) 100 rpm, dengan 2 media: 0,1 N HCl, 120 menit untuk stadium asam, dan buffer fosfat pH 6,8, 90 menit untuk stadium dapar. Sampel diambil pada 120 menit untuk stadium asam, dan setiap 10 menit sampai dengan 90 menit untuk stadium dapar. Asam asetilsalisilat diukur kadarnya dengan...

Survival extrapolation using the poly-Weibull model

Recent studies of (cost-) effectiveness in cardiothoracic transplantation have required estimation of mean survival over the lifetime of the recipients. In order to calculate mean survival, the complete survivor curve is required but is often not fully observed, so that survival extrapolation is necessary. After transplantation, the hazard function is bathtub-shaped, reflecting latent competing...

A log-extended Weibull regression model

A bathtub-shaped failure rate function is very useful in survival analysis and reliability studies. The well-known lifetime distributions do not have this property. For the first time, we propose a location-scale regression model based on the logarithm of an extended Weibull distribution which has the ability to deal with bathtub-shaped failure rate functions. We use the method of maximum likel...