introduction: although the main hazard in cement processing is dust, and respiratory tract disorders are the most important group of occupational diseases in this industry, evidence for association between exposures to cement dust and either respiratory symptoms or functional impairment has not been conclusive. this study was, therefore, undertaken to examine, more thoroughly, the effects of oc...

The dust-bathing behavior of Lohmann Selected Leghorn hens was compared in 4 enriched colony housing systems and in an aviary system. The enriched colony housing systems differed especially in the alignment and division of the functional areas dust bath, nest, and perches. Forty-eight-hour video recordings were performed at 3 time-points during the laying period, and focal animal sampling and b...

[1] This study is concerned with the quantitative prediction of dust storms in real time. An integrated wind erosion modeling system is used for 24-, 48-, and 72-hour forecasts of northeast Asian dust events for March and April 2002. The predictions are validated with synoptic records from the meteorological network and dust concentration measurements at 12 stations in China, Japan, and Korea. ...

Theoretical study on dust dynamics under cryogenic environment in a complex plasma is presented. Expansion process and cooling process of highly charged dust particles in a plasma containing background ultracold neutral particles are studied. The processes are described by kinetic theory with Fokker-Planck collision term of the interaction between neutral particles and dust particles. Time evol...

Theoretical and experimental studies of low-frequency electrostatic waves in plasmas containing negatively charged dust grains are described. The presence of charged dust is shown to modify the properties of ion-acoustic waves and electrostatic ion-cyclotron waves through the quasineutrality condition even though the dust grains do not participate in the wave dynamics. If the dust dynamics is i...