The rock mass consists of rock blocks and structural planes, which can reduce its integrity and strength. Therefore, accurately obtaining the characteristics of the rock mass structural plane is a prerequisite fo. [pdf]
Pneumatic down-the-hole (DTH) hammer has been extensively used in air drillings through hard and ultra-hard geological formations. Numerical modeling can offer close observation on the working behav. [pdf]
A propeller is a rotating fan like structure which is used to propel the ship by using the power generated and transmitted by the main engine of the ship. .
Marine propellers are made from corrosion-resistant materials as they are made operational directly in seawater which is a corrosion accelerator. The materials used for making marine propellers are an alloy of aluminium and stainless steel. Other. .
Propeller blades may vary from 3 blade propeller to 4 blade propeller and sometimes even 5 blade propeller. However, the most commonly used are 3 blades and 4 blade. .
Propellers are be classified on the basis of several factors. The classification of different types of propellers is shown below: .
Pitch of a propeller can be defined as the displacement that a propeller makes for every full revolution of 360 ̊. The classification of the. [pdf]
A cutting process that involves spinning a drill bit to create a circular hole in solid materials is known as drilling. The drill bit is typically a multi-point rotary cutting tool. The bit is pressed against the workpi. [pdf]
Rotary-screw compressors use two very closely meshing spiral rotors to compress the gas. In a dry-running rotary-screw compressor, timing gears ensure that the male and female rotors maintain precise alignment without contact which would produce rapid wear. In an oil-flooded rotary-screw compressor, lubricating oil bridges the space between the rotors, both providing a hydraulic seal and transferring mechanical energy between the rotors, allowing one rotor to be e. [pdf]
A structure is an arrangement and organization of interrelated elements in a material object or , or the object or system so organized. Physical structures include artifacts and objects such as and and natural objects such as , and . Abstract structures include in and . Types. [pdf]
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