نتایج جستجو برای: ansi
تعداد نتایج: 3751 فیلتر نتایج به سال:
The designated fiber stress values published in the American National Standards Institute Standard for Poles, ANSI O5.1, no longer reflect the state of the knowledge. These values are based on a combination of test data from small clear wood samples and small poles (<55 ft (<17 m)) and field experience up to the time of adoption of the standard in 1965. A number of changes over the past 35 year...
Besides the well established access control models, Discretionary Access Control (DAC) and Mandatory Access Control (MAC), the policy neutral Role Based Access Control (RBAC) is gaining increasing attention. An important step towards a wide acceptance of RBAC has been achieved by the standardization of RBAC through the American National Standards Institute (ANSI). While the mandatory concept of...
IN 1972, the Committee on Electrocardiography of the American Heart Association (AHA) first published recommendations dealing with electrical safety in electrocardiographic (ECG) and vectorcardiographic (VCG) instruments.' These specifications were restated in slightly altered form in 1975.2 To our knowledge, practically all manufacturers of ECG equipment sold in the United States now follow th...
Energy management for industry is many times an unspoken objective in organizations because it is desirable to reduce operating costs but often not important enough to justify a financial investment in managing. Unfortunately without a comprehensively planned and adequately funded management program, energy management efforts degrade into unsustainable or ineffective programs that are discarded...
INTRODUCTION The aim of this in vitro study was to determine the liquid-powder ratio, setting time, solubility, dimensional change, pH, and radiopacity of white structural and non-structural Portland cement, ProRoot MTA and MTA Bio, associated with a 2% glycolic solution containing Aloe Vera, as vehicle. METHODS AND MATERIALS Five samples of each material were used for each test, according to...
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