نتایج جستجو برای: brazilian disc test specimen
تعداد نتایج: 947482 فیلتر نتایج به سال:
background: ninety percent of all people sometimes during their lives experience low back pain, and 30-40% develops radicular leg pain with the sciatica characteristics. although for clinical diagnosis of lumbar disc herniation (ldh) straight leg raising (slr) test in 85-90% of cases indicates ldh, but in our practice with ldh patients this test is frequently negative despite radicular leg pain...
conclusions: with respect to the obtained results and regarding to the daily increase of the resistant microbial strains to the commercial antibiotics, it can be concluded that these extracts can be proper candidates of antibacterial substance against pathogenic bacterial species especially s. aureus, e. coli, k. pneumoniae and s. epidermidis. results: the extract of c. fistula was effective ag...
The effects of applied load, sliding speed and sliding distance on the dry sliding wear behavior of aged Al-SiCp-Gr composites were investigated. The specimen were fabricated by stir-casting technique. The pin-on-disc wear testing machine was used to investigate the wear rate by design of experiments based on L27 using Taguchi technique. Sliding distance was the most important variable that inf...
background and objectives: methicillin-resistant staphylococcus aureus (mrsa) is a well-known pathogen with a worldwide distribution. given the increasing rate of mrsa infections, implementing of reliable, accurate and rapid testing for diagnosis of mrsa is necessary. the aim of this study was to compare four diagnostic methods for detection of mrsa isolates. materials and methods: from decembe...
The unsustainable use of resources and the rising demand for traditional concrete have disrupted ecological equilibrium, necessitating adoption a more appropriate long-lasting alternative. One such substitute cement in production is geopolymer concrete, although this material prone to cracking fracturing due its low tensile strength, leading costly repairs or even structural collapse. Fiber-rei...
Rock anisotropy plays an important role in engineering behavior of rocks. Slates are anisotropic rocks which have long been used for gable roof, floor tiles, borrow materials, and other purposes. The slates studied in this research are calcareous and have a porphyro-lepidoblastic texture. To determine the role of the anisotropy on the tensile strength and fracture pattern, two variables includi...
PURPOSE To study the optic nerve head (ONH) morphology of patients with Leber's hereditary optic neuropathy (LHON) in a large family from Brazil carrying the 11778/ND4 mutation and in a case series of unrelated Italian families bearing different mitochondrial DNA (mtDNA) pathogenic mutations. METHODS Enrolled in the study were 15 LHON-affected patients (LHON-affected) and 45 LHON unaffected m...
A new test method has been developed to measure the resistance of dynamic fracture initiation in brittle materials under combined mode I/I loadings. The Brazilian disks with center-cracks have been fractured under oblique impact loadings in diarnetral-compression. The dynamic stress intensity factors of mode I and H are evaluated from the superposition integrals of the step response functions f...
Understanding the tensile strength properties and damage evolution mechanism in fissured rock is very important to fundamental research engineering design. The effects of flaw dip angle on strength, macroscopic crack propagation failure mode symmetrical Brazilian discs rock-like materials were investigated. A parallel bonding model was proposed examine pre-flawed under splitting load. microscop...
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