Palm Nut Cracking under Repeated Impact Load

Technical intelligence and culture: Nut cracking in humans and chimpanzees.

OBJECTIVES According to the technical intelligence hypothesis, humans are superior to all other animal species in understanding and using tools. However, the vast majority of comparative studies between humans and chimpanzees, both proficient tool users, have not controlled for the effects of age, prior knowledge, past experience, rearing conditions, or differences in experimental procedures. W...

Kinetics of Palm Oil Cracking in Batch Reactor

The kinetics of palm oil catalytic cracking over aluminum containing mesoporous silica Al-MCM-41 (5% Al) was investigated in a batch autoclave reactor at the temperatures range of 573 – 673 K. The catalyst was prepared by using sol-gel technique and has been characterized by nitrogen adsorption and x-ray diffraction methods. Surface area of 1276 m/g with average pore diameter of 2.54 nm and por...

Stainless steel pitting and early-stage stress corrosion cracking under ultra-low elastic load

Development of stone tool use by wild chimpanzees (Pan troglodytes).

At the age of 3.5 years, wild chimpanzees at Bossou, Guinea, begin to use hammer and anvil stones to crack oil-palm nuts to get the kernels. To clarify the developmental processes, the authors did a field experiment in which stones and oil-palm nuts were provided. Infant chimpanzees' stone-nut manipulation was observed and video recorded. Data were collected from 3 infants younger than 4 years ...

Investigations on Material Casualty of Plates under Impact Load Conditions

Impact problems are typical in nature since they involve geometry, boundary and material non-linearity. The impact of projectiles at sub-ordnance velocities against mild steel, stainless steel and aluminum plates has been studied. In this paper, target plates of 3mm thickness of materials Mild steel, Titanium are made to impact by Tungsten fragment with different velocities 300, 500, 700 and 10...