نتایج جستجو برای: open hole specimens
تعداد نتایج: 547395 فیلتر نتایج به سال:
AIMS To report on the use of trypan blue (TB) 0.06% for staining the internal limiting membrane (ILM) and epiretinal membrane (ERM) during vitrectomy and report on their histology. METHOD 14 consecutive patients with idiopathic macular hole or macular pucker (seven patients each) were prospectively recruited for ILM or ERM peel respectively. After pars plana vitrectomy and induction of poster...
The in-plane compressive behaviour of thin-skin stiffened composite panels with a stress concentrator in the form of an open hole or low velocity impact damage is examined analytically. A fracture mechanics model, developed initially to predict notched compressive strength, was applied to estimate the compression-after-impact strength of a stiffened panel; in the analysis the impact damage is r...
The entropy of a near-extremal black hole made of parallel D-branes has been shown to agree, upto a numerical factor, with that of the gas of massless open string states on the brane worldvolume when the string coupling is chosen suitably. We investigate the process of emission or absorption of massless S-wave neutral scalars by these black holes. We show that with rather mild assumptions about...
To evaluate the effect of circular holes on mechanical properties laminated composite plates with different sizes, static tensile destructive tests were carried out four types layups and aperture sizes. The experimental results showed that for layup, strength specimens a diameter 6.35 mm decreased by 44.3 %, 51.3 48.0 39.4 % compared to intact specimens, greater proportion 0° decrease perforate...
Textile techniques like overbraiding offer the possibility to perform some function integration during the composite fabrication stage. As an example, it is possible to integrate axes or holes necessary to transfer loads to the composite structure. Moreover, this prevents drilling and therefore fracturing load-carrying fibres at a latter stage. However, this means a local reorientation of the f...
Unlike hole coaxiality or other drilling defects, misalignment has never been a major concern in aeronautical structures as perfect bolt-hole alignment was ensured through the global assembly process. However, new industrial philosophy called hole-to-hole, which aims to decrease cost and time an unavoidable effect. A number of numerical studies have investigated load distribution among fastener...
OBJECTIVE To measure vitreous concentrations of glutamate and other amino acids in patients with glaucoma undergoing vitrectomy. METHODS Undiluted vitreous samples were collected from patients undergoing vitrectomy at the University of Iowa (Iowa City) between 1997 and 1998 (n = 69). Vitreous concentrations of 16 amino acids, including glutamate, were determined using high-pressure liquid chr...
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