منابع مشابه
A laboratory study of rock properties affecting the penetration rate of pneumatic top hammer drills
In this paper, after collecting the rock samples from eight mines and one high way slope, the tests for determination of dry density, Uniaxial Compressive Strength, tensile Strength (Brazilian Test), elastic modulus, Schmidt hammer rebound number have been done on samples. In addition, in order to calculating the mean size of rock grains, quartz content, hardness and abrasivity, a thin sections...
متن کاملHypoxic ocular sequelae of carotid - cavernous fistulae
The incidence of visual failure with carotid-cavernous fistula is high. It was impaired in 89 per cent. of the cases studied by de Schweinitz and Holloway (I908) and in 73 per cent. of those studied by Sattler (I920). The latter recorded blindness or near blindness in almost half of his patients. Treatment has reflected a clinical preoccupation with elimination of the bruit and reduction of the...
متن کاملa laboratory study of rock properties affecting the penetration rate of pneumatic top hammer drills
in this paper, after collecting the rock samples from eight mines and one high way slope, the tests for determination of dry density, uniaxial compressive strength, tensile strength (brazilian test), elastic modulus, schmidt hammer rebound number have been done on samples. in addition, in order to calculating the mean size of rock grains, quartz content, hardness and abrasivity, a thin sections...
متن کاملOcular sequelae from the illicit use of class A drugs
Aim: To highlight the changes that may take place in the visual system of the class A drug abuser. Methods: A literature review was carried out of ocular/visual sequelae of the more common class A drugs. These include stimulants (cocaine and crack cocaine), narcotics (heroin, morphine, methadone) and hallucinogenics (ecstasy, lysergic acid diethylamide, magic mushrooms, mescaline, phencyclidine...
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ژورنال
عنوان ژورنال: Eye
سال: 2000
ISSN: 0950-222X,1476-5454
DOI: 10.1038/eye.2000.14