Pre-treatment Cellulose 2 Elaeis 2 Empty fruit bunches 2 Fruits 2 Lignocellulosic composition 2 Mechanical behaviours 2 Morphology 2 Oil palm 2 Oil palm stalk fibres (OPSF) 2 Palm oil 2 Pre-Treatment 2 Scanning electron microscopy 2 Sodium hydroxide (NaOH) 2 X-ray diffraction 2 cellulose 2 crystallinity 2 ACID 1 Agricultural robots 1 Agricultural wastes 1 Alkali concentrations 1 Anaerobic digestion 1 Bio-based chemicals 1 Biochemical synthesis 1 Biodegradation 1 Biofuel production 1 Biogas 1 Boolean functions 1 Boron-doped diamond electrodes 1 CELLULOSE 1