The emergence of crack in the spring of 1986 and a flood of lurid and often exaggerated press accounts of inner-city crack use ushered in a period of intense public concern about illegal drugs, and helped reinforce the impression that drug use was primarily a minority problem. Enforcement of the nation's drug laws at the street level focused more and more on poor communities of color. In the mid- to late-1980s, many cities initiated major law enforcement programs to deal with street-level drug dealing. "Operation Pressure Point" in New York was an attempt to rid the predominantly Hispanic Lower East Side of the drug trade. Operation Invincible in Memphis, Operation Clean Sweep in Chicago, Operation Hammer in Los Angeles, and the Red Dog Squad in Atlanta all targeted poor, minority, urban neighborhoods where drug dealing tended to be open and easy to detect.
In the 1980s, with the emergence of the crack market, skin color alone became a major profile component, and, to an increasing extent, black travelers in the nation's airports and found themselves the subjects of frequent interrogations and suspicionless searches by the DEA and the U.S. Customs Service. These law enforcement practices soon spread to train stations and bus terminals, as well.
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Excessively dry air can also take a toll on your wooden furniture and floors. When the humidity levels are too low indoors, your wood furniture, floors, door, and window frames can splinter and crack.
Fatigue crack propagation (FCP) rates in submerged arc welding (SAW) seam welds of 1524 steel (API 5L X42) pipe were measured by using an arc-shaped bend specimen with the same radius of curvature of the body of the pipe so the material did not have to be cold worked to get a flat shape nor extensively machined. The test direction was girth radial and the stress intensity factor (K) function was calibrated for this type of nonstandard specimen. The FCP tests were carried out in air at room temperature, testing the three zones: The base metal, the deposited metal, and the heat affected zone (HAZ). A fractographic analysis was done to analyze the role of the microstructure in the FCP in the three zones. It was found that the zone of greater resistance to FCP was the base metal, whereas the deposited metal showed the least resistance to crack propagation. FCP in the deposited metal and the HAZ behaved according to the Paris law, unlike the base metal, which showed a high data dispersion. The behavior in the base metal was attributed to the propagation of the crack in the transverse direction of the preferential alignment of the microstructure, while the deposited metal and the HAZ had a more homogeneous microstructure.
Low humidity causes static electricity, dry skin and hair, increased susceptibility to colds and respiratory illness and can allow viruses and germs to thrive. Wood floors, furniture, and millwork will split and crack, the paint will chip, and electronics can be damaged because of low humidity levels. 2ff7e9595c
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