Concrete bridges are used for both highways and railways roads.They are characterized by their durability, rigidity, economy and beauty.Concrete bridges have many types such as simply supported girder bridges, arch bridges and rigid frame bridges.However, for very large spans, arch bridges are more economic in addition to their beauty appearance.In
The new fatigue data sheet, No.132, discloses gigacycle fatigue properties of the A6061-T6 aluminium alloys at high stress ratios.The fatigue tests were conducted mainly by the ultrasonic fatigue testing at 20 kHz, while conventional fatigue tests at 100 Hz were also conducted for comparison.The fatigue test results indicated that fatigue limits we
We present the synthesis and biological evaluation of the prototype of a new class of cephalosporins, containing an additional isolated beta lactam ring with two phenyl substituents.This new compound is effective against Gram positive microorganisms, with a potency Hayward SP1090 Skimmer Parts similar to that of ceftriaxone, a cephalosporin widely
Electrical characteristics of coal mine high voltage cable was analyzed under situation of water tree aging, electrical tree aging and overall uniform deterioration.Wavelet noise canceling technology and signal separation technology based on Grooming orthogonal decomposition were used for noise signal processing of grounding line current.Changing t