نتایج جستجو برای: compressive properties

تعداد نتایج: 885875  

Journal: :Lasers in surgery and medicine 2012
William C Vogt Alondra Izquierdo-Román Brandon Nichols Liang Lim James W Tunnell Christopher G Rylander

BACKGROUND AND OBJECTIVES Mechanical indentation has been shown to increase light transmission through turbid tissue. In this study, we investigated the effects of localized indentation on the optical properties of ex vivo porcine skin specimens by dynamically monitoring diffuse reflectance spectra, light transmission, and applied load while controlling tissue thickness. STUDY DESIGN/METHODS ...

Eghlim, MH, Emami Arjomand , M, Jalalian, SH, Mahavi, A, Mirzakhani, ,

Background and Aim: Although the physical properties of modern glass ionomers have been extensively reported, few studies have examined how these parameters change with age. This experimental study aimed to investigate the effect of aging on the compressive strength of resin-reinforced glass ionomers. Material and Methods: Two glass ionomers (Fuji IX GP Fast, GC, Japan, and Ketac Universal, 3M,...

2009
H. Manolea Sonia Degeratu V. Deva Evantia Coles Emma Draghici

The mechanical properties of the light-cured composite resins are related to the material composition, but also vary according to the light-source characteristics used for polymerization. In this study we followed the compressive strength variation for a light-cured composite resin according to the time of exposure to the curing light. With that end in view,18 test pieces were made from a light...

2013
Chandrahas Sahu M. K. Gupta

This paper presents the results of an experimental research on the workability and compressive strength of ordinary and standard concrete. Superplasticizers are commonly known as High Range Water Reducers (HRWRs) because it permits low water cement ratio as well as the workability also affected. In this paper the properties of concrete mixtures with three different dosages of superplasticizers ...

Journal: :Tissue engineering. Part A 2012
Liming Bian David Y Zhai Emily C Zhang Robert L Mauck Jason A Burdick

Mesenchymal stem cells (MSCs) are being recognized as a viable cell source for cartilage repair, and there is growing evidence that mechanical signals play a critical role in the regulation of stem cell chondrogenesis and in cartilage development. In this study we investigated the effect of dynamic compressive loading on chondrogenesis, the production and distribution of cartilage specific matr...

Journal: :Biomaterials 2007
Xinfeng Shi Balaji Sitharaman Quynh P Pham Feng Liang Katherine Wu W Edward Billups Lon J Wilson Antonios G Mikos

We investigated the fabrication of highly porous scaffolds made of three different materials [poly(propylene fumarate) (PPF) polymer, an ultra-short single-walled carbon nanotube (US-tube) nanocomposite, and a dodecylated US-tube (F-US-tube) nanocomposite] in order to evaluate the effects of material composition and porosity on scaffold pore structure, mechanical properties, and marrow stromal ...

Journal: :محیط شناسی 0
مسعود جمشیدی دانشگاه علم و صنعت ایران، گروه پلیمر، استادیار دانشکده مهندسی شیمی امیر جمشیدی دانشگاه تهران ، دانشکدة محیط زیست ، کارشناس ارشد مهندسی عمران محیط زیست ناصر مهردادی دانشکاه تهران، دانشکدة محیط زیست ، دانشیار گروه مهندسی عمران محیط زیست

the present work has been performed to eliminate sewage dry sludge of alborze city wastewater treatment plant by using them as fine aggregate in concrete. on this basis, at first the selected dry sludge was analyzed for xrd and xrf for crystalline phases and chemical composition, respectively. the results showed that more than 50% of the sludge is formed of sio2 and it had more than 20% organic...

2009
Desmond J. VanHouten Donald G. Baird

In this study, carbon nano-fibers (CNFs) were used to increase the compressive properties of poly(arylene ether sulfone) (PAES) foams. The polymer composite pellets were produced by melt blending the PAES resin with CNFs in a single screw extruder. The pellets were saturated and foamed with water and CO2 in a one-step batch process method. Dynamic mechanical thermal analysis (DMTA) was used to ...

Journal: :European cells & materials 2015
A R Gannon T Nagel A P Bell N C Avery D J Kelly

While it is well established that the composition and organisation of articular cartilage dramatically change during skeletal maturation, relatively little is known about how this impacts the mechanical properties of the tissue. In this study, digital image correlation was first used to quantify spatial deformation within mechanically compressed skeletally immature (4 and 8 week old) and mature...

Journal: :Biomaterials 2001
J A Stammen S Williams D N Ku R E Guldberg

Poly(vinyl alcohol) (PVA) hydrogels have been proposed as promising biomaterials to replace diseased or damaged articular cartilage. A critical barrier to their use as load-bearing tissue replacements is a lack of sufficient mechanical properties. The purpose of this study was to characterize the functional compressive and shear mechanical properties of a novel PVA hydrogel. Two formulations of...

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