introduction: recently, air pollution due to the occurrence of dust storms is one of the worst environmental problems in western and southwestern iran, especially the khuzestan province (12, 13). according to the reports of the meteorological organization of iran the average number of dusty days in the cities of ahvaz and abadan in the khuzestan province reaches 68 and 76 days each year, respec...

Several urban areas of the country in violation of the National Ambient Air Quality Standard (NAAQS) for particulate matter have identified fugitive dust generated by vehicular traffic on paved streets and highways resulting from mud/dirt carryout from unpaved areas as a primary source of PM-10 (particles ≤ 10 μm in aerodynamic diameter). Since little data are currently available on the amount ...

Exposure to asbestos is associated with the development of mesothelioma. In addition to asbestos, other fibers have been identified as risk factors for malignant and non-malignant diseases of the lungs. Among these, fluoro-edenite (FE) was found in patients from Biancavilla (Sicily, Italy) with pleural and lung disease, suggesting its role for tumor expansion. In this context, the identificatio...

 Background: The phenomenon of dust is a serious environmental problem in dry and semi dry regions. It has a destructive effect for the residents of such regions. Over two-thirds of Iran is in areas of dry and semi-dry climate conditions. Methods: In this research, dust fall measurements were taken in 41 stations across Yazd city using a marble dust collector (MDCO) located in diffe...

conclusions the current study showed significant association between the rosenberg self-esteem test results and smoking, and illegal drug abuse like heroin, pills, alcohol, nas, and other substances. therefore, increasing self-esteem is essential for preventing the adolescents’ emotional and behavioral disorders. this fact could guide us to the new approaches for smoking and drug-abuse preventi...

R Coronae Borealis (RCB) stars are hydrogen-deficient, carbon-rich pulsating postAGB stars that experience massive irregular declines in brightness caused by circumstellar dust formation. The mechanism of dust formation around RCB stars is not well understood. It has been proposed that CO molecules play an important role in cooling the circumstellar gas so that dust may form. We report on a sur...

We have used SCUBA to survey an area of ≃ 50 arcmin2, detecting 19 sources down to a 3σ sensitivity limit of ∼3.5 mJy at 850μm. Monte-Carlo simulations have shown that the fluxes of sources in this and similar SCUBA surveys are biased upwards by the effects of source confusion and noise, leading to an overestimate by a factor of ∼1.4 in the fraction of the 850μm background that has been resolve...

We present new measurements of the interstellar gas-phase oxygen abundance along the sight lines towards 19 early-type galactic stars at an average distance of 2.6 kpc. We derive O I column densities from HST/STIS observations of the weak 1355 Å intersystem transition. We derive total hydrogen column densities [N(H I)+2N(H2)] using HST/STIS observations of Lyman-α and FUSE observations of molec...