In this paper, we prove that some stabilizing controllers of a plant, which admits a left/right-coprime factorization, have a special form where their stable and unstable parts are separated. The dimension of the unstable part depends on the algebraic concept of stable range of the ring A of SISO stable plants. Moreover, we prove that, if the stable range of A is equal to 1, then every plant—de...

A comparison has been made of the air-kerma standards for medium-energy x-rays of the National Institute of Standards and Technology (NIST) and the Bureau International des Poids et Mesures (BIPM). The comparison involved a series of measurements at the BIPM and the NIST using the air-kerma standards and three NIST reference-class transfer ionization chamber standards. Reference beam qualities ...

Air pollution is a critical environmental issue for California, which has some of the nation’s most polluted air basins and also the nation’s most stringent set of state and local air quality standards. This paper reviews my previous work in Lin (2011), in which I examine the effects of agriculture-related local regulations in California on air quality, as measured by the number of exceedances ...

While enforceable National Environmental Quality Standards for pollutants exist in Pakistan, ambient air quality guidelines have never been established. However, there is no reliable epidemiological/toxicological monitoring system in place in Pakistan to provide a basis for establishing guidelines for various air pollutants. This paper reviews the World Health Organization air quality guideline...

Some appliances so/d as indoor air deaners, indoor air purifiers, and personal air purifiers, purposely emit ozone, purportedly to clean the air. Manufacturers often fa/se/y c/aim that these devices eliminate bacteria, mold, and chemical contaminants from the air, and that they he/p persons WMI asthma and allergies. Advertising and sales of such devices is increasing. Staff will report on a rec...

A direct comparison was made between the air kerma primary standards used for the measurements of low-energy x rays at the National Institute of Standards and Technology (NIST) and the National Physical Laboratory (NPL). The comparison was conducted at the NPL using NPL reference radiation qualities between 10 kV and 80 kV. The results show the primary air-kerma standards to agree within 0.6 % ...

traditional agriculture and non-chemical crop production have a long story; however organic agriculture which relies on local and in-farm inputs, with the aim of protecting ecological balances and developing biological cycles on the one hand while regarding regulations and specific standards on the other hand, doesn’t have a very long history. there are numerous environmental reasons for the pr...