Tham khảo tài liệu 'volume 17 - nondestructive evaluation and quality control part 21', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | MLCD microwave liquid crystal display mm millimeter MOOT method of optimal truncation MPa megapascal mpg miles per gallon mrem millirem mSv millisievert MTF modulation transfer function mV millivolt MVP megavolt peak n neutrons N newton n index of refraction fringe number number of tests n average sample size n unit vector normal to the surface N number of cycles summation index fringe order length of the near field Nk Knudsen number NRe Reynolds number NBS National Bureau of Standards NDE nondestructive evaluation NDI nondestructive inspection NDT nondestructive testing Nd YAG neodymium yttrium-aluminum-garnet laser nm nanometer NMR nuclear magnetic resonance No. number NTSC National Television Systems Committee OD outside diameter Oe oersted OSHA Occupational Safety and Health Administration oz ounce p probability P pressure Pa pascal PC printed circuit PCB printed circuit board pH negative logarithm of hydrogen ion activity PH precipitation hardening PIND particle impact noise detection PLC programmable logic control P M powder metallurgy PMT photomultiplier tube POD probability of detection POFA probability of false alarm ppm parts per million ppt parts per trillion psi pounds per square inch psig gage pressure pressure relative to ambient pressure in pounds per square inch Q calibrated leakage flow r number of levels of each factor original pixel value radius range R roentgen R resistance reflection coefficient rise time gas constant radius Ra arithmetic average roughness Rs effective shunt resistance rad radiation absorbed dose radac rapid digital automatic computing rbe relative biological .
