Why is ship breaking dangerous? In addition to taking a huge toll on the health of workers, ship breaking is a highly polluting industry. Large amounts of carcinogens and toxic substances (PCBs, PVCs, PAHs, TBT, mercury, lead, isocyanates, sulfuric acid) not only intoxicate workers but are also dumped into the soil and coastal waters. How […]
What is the default tolerance zone shape for a position tolerance?
What is the default tolerance zone shape for a position tolerance? If the tolerance is preceded by a diameter symbol (⌀), the tolerance is a diameter or cylindrical shaped zone, as in the position of a hole. If there is no symbol preceding the tolerance, the default tolerance zone shape is parallel planes or a […]
How do dislocations increase strength?
How do dislocations increase strength? Plastic deformation occurs when large numbers of dislocations move and multiply so as to result in macroscopic deformation. Pinning points, or locations in the crystal that oppose the motion of dislocations, can be introduced into the lattice to reduce dislocation mobility, thereby increasing mechanical strength. How does a dislocation allow […]
How do you calculate the open circuit voltage of a solar cell?
How do you calculate the open circuit voltage of a solar cell? As we know, the open circuit voltage equals to the quasi-Fermi level separation of a solar cell under illumination. Common way to calculate the voltage is using the equation, KT/q*ln(Iph/I0+1). What is open circuit voltage and short circuit current in solar cell? The […]
What is acceptable dB loss for single mode fiber?
Do you say hello everyone or everybody?
Do you say hello everyone or everybody? The only difference between, “Hi everybody” and “Hi everyone” is , “everyone” is more formal. But both are correct greetings. You can also say, “Hi all”. Which is correct everybody or everyone? Everyone and everybody mean the same. Everyone is a little more formal than everybody. Everyone is […]
Who is responsible for training workers on the use of PPE?
Who is responsible for training workers on the use of PPE? In general, your employer is responsible for: Continually working to identify and control hazards. Providing appropriate PPE for employees. Training employees in the use and care of the PPE. Do employees need to be trained in the use of PPE? 1910.132(f)(1) The employer shall […]
Why does HF have a higher boiling point than F2?
Why is aluminum used for Xray beam filtration?
Why is aluminum used for Xray beam filtration? Beryllium is commonly used in mammography (which use low-energy photons) as it provides very little filtration. Other types of x-ray generally use aluminum, copper or tin. This is due to the loss of lower energy photons from a polychromatic beam. The average x-ray energy is increased and […]
What might happen if the fuel and air mixture is too rich?
What might happen if the fuel and air mixture is too rich? When your engine is running rich, it will cause bad emissions. A rich air-fuel mixture will create black smoke, which will then come out from your exhaust pipe. What is a rich air/fuel ratio? The ideal (theoretical) air-fuel ratio, for a complete combustion, […]