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Time-of-flight mass spectrometry ( TOFMS) is a method of mass spectrometry in which an ion 's mass-to-charge ratio is determined by a time of flight measurement. Ions are accelerated by an electric field of known strength. [1] This acceleration results in an ion having the same kinetic energy as any other ion that has the same charge.
China's labor market was highly regulated and dominated by state-owned enterprises, with an average unemployment rate of 3.7 per cent between 1988 and 1995, but this rose sharply after numerous lay-offs between 1995 and 2002, reaching an average unemployment rate of 9.5 per cent between 2002 and 2009. These changes had the greatest impact on ...
Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration (change of velocity) when a net force is applied. [1] The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram (kg).
Gas chromatography–mass spectrometry. Liquid chromatography–mass spectrometry ( LC–MS) is an analytical chemistry technique that combines the physical separation capabilities of liquid chromatography (or HPLC) with the mass analysis capabilities of mass spectrometry (MS). Coupled chromatography – MS systems are popular in chemical ...
Secondary electro-spray ionization ( SESI) is an ambient ionization technique for the analysis of trace concentrations of vapors, where a nano-electrospray produces charging agents that collide with the analyte molecules directly in gas-phase. In the subsequent reaction, the charge is transferred and vapors get ionized, most molecules get ...
The steady employment gains in recent months suggest a rough answer. The unemployment rate has been 7.9 percent, 7.8 percent and 7.8 percent for the past three months, while the labor force participation rate has been 63.8 percent, 63.6 percent and 63.6 percent. Meanwhile, job gains have averaged 151,000.
Mass murder is the violent crime of killing a number of people, typically simultaneously or over a relatively short period of time and in proximity. [1] [2] A mass murder typically occurs in a single location where one or more persons kill several others.
t. e. Unemployment insurance in the United States, colloquially referred to as unemployment benefits, refers to social insurance programs which replace a portion of wages for individuals during unemployment. The first unemployment insurance program in the U.S. was created in Wisconsin in 1932, and the federal Social Security Act of 1935 created ...