This paper considers a panel duration model that has a proportional hazards specification with fixed effects. The paper shows how to estimate the baseline and integrated baseline hazard functions without assuming that they belong to known, finitedimensional families of functions. Existing estimators assume that the baseline hazard function belongs to a known parametric family. Therefore, the es...

methyl orange is one dye resulted from the textile industry. the aim of this study is to test theadsorption capacity of nickel oxide nanoparticles for removing the methyl orange from aqueoussolution. the parameters studied were the effect of temperature, contact time and initial ph ofsolution. results indicate that the removal efficiency of nickel oxide nanoparticles increases withincreasing co...

Biosorption of cadmium ions from simulated wastewater using rice husk was studied with initial concentration 25 mg/l. Equilibrium isotherm Langmuir, Freundlich, BET and Timken models. The results show that the Freundlich is best fit model to describe this process high determination coefficient equals 0.983. There a good compliance between experimental theoretical results. Highest removal effici...