Creep resistant ferritic steels based on Fe–2·25Cr–1Mo and Fe–(9–12)Cr have been used extensively in the energy and petrochemical industries for more than half a century. This is because they have an outstanding record of reliability in quite aggressive conditions over time periods as long as 30 years. The alloys have undergone progressive development throughout their history,1,2 particularly i...

introduction: to study the effect of gallic acid (ga) on hippocampal long-term potentiation (ltp) and histological changes in animal model of alzheimer disease (ad) induced by betaamyloid (aβ). methods: sixty-four adult male wistar rats (300±20 g) were divided into 8 groups: 1) control (cont); 2) ad; 3) sham; 4-7) ad+ga (50, 100, and 200 mg/kg for 10 days, orally) or vehicle, 8) cont+ga100, aβ ...

achillea millefolium belonging to the astreaceae family is an endangered medicinal plant of jordan and of its neighboring countries. as an alternative to seed propagation, an efficient micropropagation of a. millefolium and its subsequent rooting were developed as an option for its in vitro conservation. a maximum of 5.9 shoots per microshoot were obtained on murashige and skoog agar medium sup...

In this paper, the short-term creep behavior of the Inconel-713C superalloy after different pre-treatments including the ageing and forging processes has been studied at 850 °C. The ageing heat treatment was heating at 930 °C for 16 hours without solutioning process. The optical microscopy (OM) and the scanning electron microscopy (SEM) techniques were applied for microstructural evaluations. T...

this study identifies and compares the antecedent of nigerian students’ perception on business social responsibility. part of its objectives is to examine the perception of business students in terms of importance of business social responsibility with respect to profitability, and the effectiveness of social responsibility in both long and short terms. the study reviews the related literature ...

For modern creep-resistant steels, ductility is primarily controlled by cavitation, since brittle rupture dominating during long-term service. In recent years, the present authors have formulated fundamental models for nucleation and growth of cavities that been verified to be able describe experiments austenitic stainless steels. These equations, together with dislocation creep, are used in th...

introduction: verapamil, a phenylalkylamin –type ca2+ channel blocker, is widely used in the treatment of cardiovascular disorders especially as an antiaryhthmic and antiangina agent. theoretically, calcium can influence thyroid function and there are evidences that ca2+ channel blockers are able to interfere with thyroid function. in this study, the effects of chronic oral administration of ve...

Synopsis: With long-term deflection being a critical design criterion, accurate deflection prediction is an important aspect of slab design. The many factors that influence long-term deflections and their interdependence as well as variability in material strengths and characteristics make this a challenging problem. Most building codes and standards provide methods and formulae to account for ...

Destructive testing of creep exposed components is a powerful tool for evaluation of remaining lifetime of high temperature pipe systems. The most common destructive evaluation method used today is uniaxial creep testing. Uniaxial creep tests can produce accurate creep curves but the test method has some drawbacks such as costliness and long testing times. It also demands large sample material ...

Creep response of a full-scale floor system fabricated with composite wood I-joists and oriented strand board (OSB sheathing) was measured for 280 days at sustained uniform loads of 20 psf (0.96 kPa). Creep responses of bare I-joists and 3-joist T-beams with OSB sheathing (glued and unglued tongue and groove sheathing joints) were measured under similar load levels and duration. The creep defle...