Fixed fiber optic attenuators
Updated: 2010-01-29 15:48:18
Fiber optic attenuators are used in the fiber optic links to reduce the optical power
DWDM Transponder with Multi-Rate XFP Interfaces
Updated: 2010-01-29 15:48:09It is multi-rate, bidirectional transponder converts short-reach 10 Gb/s optical signals to long-reach, single-mode dwdm optical interfaces.10G SFP Plus Optical Fiber Modules
Updated: 2010-01-29 15:47:58The lead-free and RoHS-compliant small form factor pluggable sfp+ transceiver improves the performance for 10Gigabit Ethernet applications and is ideal for high-speed,local area network applications.Fiber Optic Channel Monitor
Updated: 2010-01-29 15:47:48This module is a powerful tool serving at optical communication nodes to monitor and measure DWDM wavelengths at strategic points in the optical network.Power Over Ethernet Switch
Updated: 2010-01-29 15:47:37It connects remote POE segment to the network over fiber.Super Resolution Microscope Stage: Piezo-Z Slide Scanner Images Faster
Updated: 2010-01-29 15:47:25PI introduced the new P-736 microscope slide Z-scanner piezo stage at the 2010 BIOS /Paragon Software Systems Inc
Updated: 2010-01-29 15:46:24Paragon's market leading optimization solutions for routing and scheduling, resource management and transportation execution are helping hundreds of companies across the globe with logistics modelling and fuel reduction.Mechanical properties and bonding of maxillofacial silicone elastomers
Updated: 2010-01-29 15:36:21Abstract: Objectives: Maxillofacial silicone elastomers are used to replace facial parts lost through disease or trauma. However, these materials do not possess ideal properties. The purpose of this study was to investigate the mechanical properties of recently and previously introduced maxillofacial silicone elastomers and their bond strength to acrylic resin substrate.Materials and methods: Specimens of three maxillofacial silicone elastomers (TechSil S25, Cosmesil M511, and Cosmesil Z004) were prepared according to manufacturers’ instructions. Tear and tensile strengths, elongation percentage, modulus of elasticity and hardness were evaluated for each material. Shear bond strengths of these silicone elastomers to primed acrylic resin surfaces were evaluated. Data was analyzed with 1-w...MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.A novel experimental method for the local mechanical testing of human coronal dentin
Updated: 2010-01-29 15:36:21Abstract: Objectives: The small volume of human dentin available for sample preparation and the local variations in its microstructure present a real challenge in the determination of their mechanical properties. The main purpose of the present study was to develop a new procedure for the preparation and mechanical testing of small-scale specimens of biomaterials such as dentin, so as to probe local mechanical properties as a function of microstructure.Methods: Ultra short laser pulses were used to mill a block of dentin into an array of 16μm size dentin pillars. These could then be individually tested in compression with an instrumented nanoindenter fitted with a 30μm wide flat punch.Results: The laser-based pillar preparation procedure proved effective and reliable. Data was produced f...Reinforcement of resin based cement with titania nanotubes
Updated: 2010-01-29 15:36:21Abstract: Objective: One of the limitations of resin cements and flowable dental composites is their poor mechanical properties such as low flexural strength and fracture resistance under body conditions. The present study was performed to enhance the mechanical properties of commercial acrylic cement (CMW®1) by introducing novel nanostructured titania tubes (n-TiO2 tubes) into the cement matrix, with the tubes acting as a reinforcing phase. The long term objective is to add these fillers as reinforcement to dental resin cements and flowable composites in combination with existing fillers.Methods: The surface of the n-TiO2 tubes was modified using a bi-functional monomer, methacrylic acid. The n-TiO2 tube content of the cement was varied from 0 to 2wt.%. The following cement properties we...Effect of liquid rubber additions on physical properties of Bis-GMA based dental resins
Updated: 2010-01-29 15:36:21Abstract: Objective: The aim of this investigation was to determine the effect of an experimental liquid rubber (LR) toughening agent on fracture toughness, crosslink density and Barcol hardness of polymerized mixtures of 50/50wt% Bis-GMA and TEGDMA.Methods: An experimental LR, was added to a solution of Bis-GMA and TEGDMA containing 1wt% dimethylamino ethyl methacrylate and 0.5wt% camphoroquinone at concentrations 0–10%. The composites were polymerized by exposure to a visible light curing unit for 60s. Fracture toughness was determined according to ASTM. 399. Crosslink density was evaluated using a swell test in ethanol.Results: Mean fracture toughness values ranged from 0.39MPam1/2 for samples containing 6% to 1.24MPam1/2 for samples containing 8% LR. Fracture toughness of samples con...Influence of LED irradiance on flexural properties and Vickers hardness of resin-based composite materials
Updated: 2010-01-29 15:36:20Abstract: Objective: To investigate the effect of irradiance through choice of LED light-curing unit (LCU) and fiber-optic tip on the mechanical properties of methacrylate resin-based composites (RBCs).Methods: Rectangular bar-shaped specimens (25mm×2mm×2mm) of four RBCs, irradiated from one side for the manufacturer's recommended times with one of two LED LCUs, and with either 8 or 13mm tip diameter, were tested in three-point bend for flexural strength and modulus of elasticity; Vickers hardness was measured on top and bottom surfaces, on overlapped and non-overlapped irradiation sites. The effects and interactions of all factors were examined by analysis of variance.Results: While the materials tested differed significantly for all properties (P (Source: Dental Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Composite resin reinforced with pre-tensioned glass fibers. Influence of prestressing on flexural properties
Updated: 2010-01-29 15:36:20Abstract: Objectives: This investigation evaluated the flexural properties of two composite resins, and the influence of unidirectional glass fiber reinforcements, with and without pre-tensioning.Methods: Two composite resins (Q: Quixfil and A: Adoro) were used to fabricate 2mm×2mm×25mm beams (N=10), reinforced with two fiber bundles along the long axis of the beam and pre-tensioned under a load equivalent to 73.5% of its tensile strength (groups QPF and APF). In two other experimental groups, the bundles were similarly positioned but without pre-tension (groups QF and AF). Two more groups were included without fiber reinforcement (control groups Q and A). After 24h storage, specimens were subjected to a three-point flexural bending test to establish the flexural module, the deflection a...Detection of free radical concentrations of three self-adhesive resin cements
Updated: 2010-01-29 15:36:20Objectives: The free radical concentrations of resin materials do not only compromise the material polymerization properties but also may impact its overall biocompatibility due to higher concentrations of residual monomers. The aim of this study was to detect free radical concentrations of three new self-adhesive resin cements using electron spin resonance (ESR) spectroscopy. (Source: Dental Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Effect of particle deposition protocols on flexural strength of zirconia after cyclic loading
Updated: 2010-01-29 15:36:20The objective of this study was to evaluate the effect of different particle deposition protocols on the biaxial flexural strength of a commercial zirconia after long term cyclic loading. (Source: Dental Materials)Effect of silane treatment on the surface of indirect composite
Updated: 2010-01-29 15:36:20Objectives: Proper cementation protocol is critical to the success of indirect restorations. Recommendation in materials and techniques however vary by manufacturer. The purpose of this study was to study the effects of silane on the cementation of indirect resin restorations. (Source: Dental Materials)Effect of specimen geometry on mechanical properties of a porcelain
Updated: 2010-01-29 15:36:20The objective of this study was to compare the Weibull parameters (characteristic strength, σ0, and Weibull modulus, m) and slow cracking growth (SCG) parameters (stress corrosion coefficient, n, and scalar parameter, σf0) obtained for a dental porcelain using two different specimen configurations. (Source: Dental Materials)Evaluation of current zirconia primers for zirconia bonding
Updated: 2010-01-29 15:36:20Objectives: Traditional HF etching and silane treatment is not effective for improving the bonding towards zirconia ceramics. The purpose of this study was to evaluate the bonding ability of current zirconia bonding agents. (Source: Dental Materials)Effect of thermo-cycling on resin cement shear bond strength
Updated: 2010-01-29 15:36:20Objectives: Repeated exposure to cyclic temperatures can result in change of bond strength. The purpose of this study is to determine the difference in shear bond strengths between a standard 24-h test and a 4000×-thermo-cycle (TC) test for a range of resin cements and bonding substrates using a newly developed shear bond strength testing rig assembly. (Source: Dental Materials)Strength degradation of dental ceramics after in vitro aging
Updated: 2010-01-29 15:36:19Objectives: To evaluate the strength degradation of five ceramics (yttria stabilized zirconia, YZ; alumina polycrystal, AL; glass-infiltrated alumina–zirconia, ICZ; and porcelains VM7 and VM9, all from Vita) after in vitro aging procedures. The null hypothesis is that these procedures cause strength degradation in all ceramics. (Source: Dental Materials)Bond strength of posts luted with different self-adhesive resin cements
Updated: 2010-01-29 15:36:19Objectives: Self-adhesive cements represent a new approach in fiber post-cementation. Aim of this study was to investigate the effect of storage in artificial saliva on bond strength of fiber posts luted with three different self-adhesive cements. (Source: Dental Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Adhesive durability of phosphate monomer resin cement to Y-TZP ceramic
Updated: 2010-01-29 15:36:19Objectives: We have recently reported the processing and physico-chemical characterization of a yttria-tetragonal zirconia polycrystal (Y-TZP) ceramic produced via coprecipitation with mechanical properties comparable to commercially reinforced ceramic materials. The purpose of the present investigation was to study the bond durability between the experimental zirconia and a phosphate monomer resin cement after two surface conditioning methods. The hypothesis tested was that bond strength is influenced by both the surface conditioning methods and storage conditions. (Source: Dental Materials)Effects of recasting titanium for ceramo-metal dental prostheses on the mechanical properties, microstructure and fracture mode
Updated: 2010-01-29 15:36:19This study evaluated the effect of the Ti condition (as-received and re-cast) on the mechanical properties, microstructure and fractography. Materials and methods: Castings (n=6) with Ti in the as-received and once recast condition were made in a centrifugal casting machine using a high-purity argon gas. The ultimate tensile strength (UTS), proportional limit (PL) and elongation (EL) of the as-received specimens were evaluated in a universal testing machine at a crosshead speed of 1mm/min. The fractured specimens were polished down for Vicker's microhardness (VHN) measurement (100g/15s) from 25μm below the cast surface, then at 50, 100, 200 and 500μm. The microstructures of the alloys were also revealed. Scanning electron microscopy fractography (SEM) was undertaken for the fractured su...Application of wet bonding for one-step bonding systems
Updated: 2010-01-29 15:36:19Objectives: The purpose of this study was to investigate the effect of wet bonding and colloidal platinum nanoparticles (CPN, Apt, LTD) on the dentin bond strength of one-step bonding systems under four different bonding strategy groups: control, wet, etch-wet, etch-CPN-wet. (Source: Dental Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Dual-application of all-in-one adhesive improves resin cement/dentin bond strength
Updated: 2010-01-29 15:36:19Objectives: To evaluate the tensile bond strength (TBS) of resin cements to bovine dentin resin-coated with all-in-one adhesive systems. Materials and methods: Each of the dual-cure resin cements; Link Max1, Clearfil Esthetic Cement2, Bistite II3 and Chemiace II4 were used to bond indirect resin disks to bovine dentin not coated with resin (control) or coated by single-application or by dual-application of an adhesive system from the same manufacturer; G-Bond1, Clearfil Tri-S Bond2, Tokuyama Bond Force3 and Hybrid-Coat4, respectively (n=10). After 24-h water storage, TBSs were measured at a crosshead speed of 2mm/min. The results were statistically analyzed by ANOVA and Bonfferroni's correction (p (Source: Dental Materials)Comparison of dynamic versus static bond strength testing
Updated: 2010-01-29 15:36:19Objectives: To evaluate the fatigue resistance of adhesives bonded to dentin, in comparison to their micro-tensile bond strength (μTBS). Materials and methods: The bonding effectiveness of three adhesives (3-step etch-and-rinse adhesive or 3-E&RA OptiBond FL, 2-step self-etch adhesive or 2-SEA Clearfil SE, and 1-step self-etch adhesive or 1-SEA G-Bond) was measured by means of a micro-tensile fatigue resistance (μTFR) and μTBS protocol. Preparation and test set-up of the micro-specimens for both μTFR and μTBS were identical. In fatigue, specimens were tested in a wide range of selected loads at 2Hz and at 10Hz until failure or until 104 cycles were reached. At 2Hz, the μTFR was measured after 1 week and 3 months of water storage. The μTFR was determined (in MPa) using a logistic re...Self-etching adhesive+glass ionomer: Saliva effects on dentin bond strength
Updated: 2010-01-29 15:36:18Objectives. The use of self-etching adhesives (SEA) increases the dentin shear bond strength (dSBS) of resin modified glass ionomers (RMGI) . The purpose of this study was to compare the dSBS of SEA+RMGI combination with the SEA+composite resin combination, and then to test the effects of water and saliva contaminations on dSBS for this association at various stages of bonding. (Source: Dental Materials)Testing bond strength: A review of the literature
Updated: 2010-01-29 15:36:18Objectives. Worldwide bond strength tests are used to evaluate bonding effectiveness of different adhesive techniques. The purpose of this study was to systematically collect these data to identify the primary parameters that affect the outcome of bond strength tests, and to attempt to disclose trends in adhesive performance of the different adhesive approaches today available. (Source: Dental Materials)Effect of film thickness of resin cement on indirect restoration
Updated: 2010-01-29 15:36:17Objectives. Adequate film thickness of resin cement is needed for long-term retention of restoration. The purpose of this study was to evaluate the effect of film thickness of various resin cements on bonding efficiency in indirect composite restoration. (Source: Dental Materials)Influence of ammonium hexafluorosilicate on enamel of permanent teeth
Updated: 2010-01-29 15:36:17Objectives. Although diamine silver fluoride (1AgF: (NH3)2AgF) stains teeth black, it is known as a very effective agent to prevent the dental caries progress . The Ammonium hexafluorosilicate (2SiF: (NH4)2SiF6), could be used as an alternative treatment without stains. The aim of this study was to determine and compare the resistance to demineralization of the enamel of permanent teeth, with SiF and AgF application. (Source: Dental Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Effect of artificial aging on bonding strength of fissure sealants
Updated: 2010-01-29 15:36:17The objective of the present study was to evaluate the effect of aging on the adhesion of total-etched and self-etched fissure sealants to ground enamel of bovine teeth using thermocycling and micro-tensile tests. (Source: Dental Materials)Controllable polymerizations: Interactions of monomer and iniferter structure
Updated: 2010-01-29 15:36:17The objective of this study was to determine the influence of monomer structure/functionality on the affinity of the thiyl radical from the iniferters with the propagating carbon radical in methacrylates. (Source: Dental Materials)Hyperbranched polymers: Their use in dental resins to reduce polymerization contraction
Updated: 2010-01-29 15:36:17Objectives. The purpose of this study was to investigate, in dental neat resins, the effect of adding hyperbranched polymers (HBPs) on polymerization contraction (C), degree of conversion (DC) and elastic modulus (E). (Source: Dental Materials)Evaluation of microleakage at sealant–enamel interfaces: A nondestructive study using micro-CT
Updated: 2010-01-29 15:36:17Objectives. The aim of this study was to examine microleakage at the interface between pit-and-fissure sealants and enamel using micro-CT. Materials and methods. Six extracted intact human molars were cleaned with prophylaxis paste in the region of pit and fissure. A sealant (Enamel Loc, Premier Dental) was applied in pits and fissures of all teeth. Three specimens were immersed in 50% silver nitrate solution for 24h followed by exposure in fluorescent light for 8h before being scanned in a micro-CT machine (X-tek). The other three were handled in the same way after undergoing 10,000 thermal cycles between 5°C and 55°C. The micro-CT images were evaluated in VGstudio Max software. (Source: Dental Materials)Lucirin-TPO: Photoinitiator reactivity and curing time reduction
Updated: 2010-01-29 15:36:16Objectives. Lucirin-TPO (L) has been introduced in some dental resin composites for aesthetic reasons as well as to increase polymerization efficiency. However, its efficiency and potential use in photoactive resin composites has not been fully described. The aim of the present work was to compare the polymerization efficiency of L with the commonly used camphorquinone/amine (CQ) photoinitiation system and to assess its potential to allow reduction of curing time. (Source: Dental Materials)Abstracts from the Academy of Dental Materials conference in Portland, October 2009. Poster Index by date
Updated: 2010-01-29 15:36:16(Source: Dental Materials)Abstracts from the Academy of Dental Materials conference in Portland, October 2009. Poster Index by presenter
Updated: 2010-01-29 15:36:16(Source: Dental Materials)Relationship between bond strength tests and other in vitro phenomena
Updated: 2010-01-29 15:36:16Conclusions: Previous studies have indicated bond strength did not correlate with the results of micro-leakage tests nor gap formation at the cavity margin. The nanoleakage test and morphological and chemical characteristics of the bonding interface had potential to predict the dentin bond durability.Significance: Bond strength test results and other in vitro phenomena was not evenly correlated. According to the development of the materials, the most appropriate bond test and analysis of the in vitro phenomena should be also developed. (Source: Dental Materials)Variables related to materials and preparing for bond strength testing irrespective of the test protocol
Updated: 2010-01-29 15:36:15Abstract: Introduction: Resin bonding can be compared to making a sandwich with the tooth on one side and the restoration on the other, a layer of bonding resin is applied to either side and a filled resin (composite) placed in between. This presentation considers factors that influence the restoration side of the sandwich and various ways that the assembled testpieces may be “aged” prior to testing. The materials to be bonded may be either ceramic, metal or composite formed by methods such as casting, pressing, sintering or machining. The fabrication method determines the susceptibility of the bonding surface to physical or chemical modification. The treatment of the surface prior to bonding can be physical (e.g. sandblasting) or chemical (e.g. metal primer); but is more likely to be ...A review of adhesion science
Updated: 2010-01-29 15:36:15Abstract: Objective: Adhesion or cohesion includes an adherend, adhesive, and intervening interface. Adhesive joints may include one or more interfaces. Adhesion science focuses on understanding the materials properties associated with formation of the interfaces, changes in the interfaces with time, and events associated with failure of the interfaces.Methods: The key principles for good interface formation are creation of a clean surface, generation of a rough surface for interfacial interlocking, good wetting of the substratum by the adhesive/cohesive materials, adequate flow and adaptation for intimate interaction, and acceptable curing when phase changes are required for final joint formation.Results: Much more effort is needed in the future to carefully assess each of these using ava...5th International Workshop DICE2010
Updated: 2010-01-29 00:00:00Conference: 13 Sep 2010 - 17 Sep 2010, Castiglioncello, Tuscany, Italy. Organized by L Diosi, H-T Elze, L Fronzoni, J Halliwell, G Vitiello .International Conference on Nanoscale Magnetism
Updated: 2010-01-29 00:00:00Conference: 28 Sep 2010 - 2 Oct 2010, Istanbul, Turkey. Organized by Gebze Institute of Technology.5th International Workshop DICE2010
Updated: 2010-01-29 00:00:00Conference: 13 Sep 2010 - 17 Sep 2010, Castiglioncello, Tuscany, Italy. Organized by L Diosi, H-T Elze, L Fronzoni, J Halliwell, G Vitiello .International Conference on Nanoscale Magnetism
Updated: 2010-01-29 00:00:00Conference: 28 Sep 2010 - 2 Oct 2010, Istanbul, Turkey. Organized by Gebze Institute of Technology.Editors for Scripta Materialia
Updated: 2010-01-28 16:26:13(Source: Scripta Materialia)Editors for Acta Materialia
Updated: 2010-01-27 15:45:20(Source: Acta Materialia)Trends in Spintronics and Nanomagnetism (TSN2010)
Updated: 2010-01-27 00:00:00Conference: 23 May 2010 - 27 May 2010, Lecce, Italy.Infinite and Infinitesimal in Mathematics, Computing, and Natural Sciences
Updated: 2010-01-27 00:00:00Workshop: 17 May 2010 - 21 May 2010, Cetraro, Italy. Organized by University of Calabria.Trends in Spintronics and Nanomagnetism (TSN2010)
Updated: 2010-01-27 00:00:00Conference: 23 May 2010 - 27 May 2010, Lecce, Italy.Infinite and Infinitesimal in Mathematics, Computing, and Natural Sciences
Updated: 2010-01-27 00:00:00Workshop: 17 May 2010 - 21 May 2010, Cetraro, Italy. Organized by University of Calabria.MICROSCIENCE 2010
Updated: 2010-01-26 00:00:00Conference/exhibition: 28 Jun 2010 - 1 Jul 2010, London, United Kingdom. Organized by Royal Microscopcial Society.Present and future of simultaneous EEG-fMRI
Updated: 2010-01-25 15:59:15
Abstract nbsp;The brain’s activity can be measured in numerous complementary ways, including electroencephalography (EEG) and functional
magnetic resonance imaging (fMRI). The simultaneous acquisition of EEG and fMRI was originally developed to make the localization
of the generators of often subtle pathological activity commonly observed in EEG recordings of patients with epilepsy more
sensitive and spatially accurate by mapping their hemodynamic correlates. Now, the value of the information provided by simultaneous
EEG-fMRI is being evaluated in a clinical context, while in parallel, more sophisticated data analysis techniques, e.g. with
electrical source imaging or dynamic causal modeling, have begun to be applied to increase the technique’s sensitivity and
allow the stu...Special Medical Exhibit
Updated: 2010-01-22 14:08:17I came across quite a special medical exhibit on BoingBoing featuring fascinating images and ancient medical .........Plasmonics UK
Updated: 2010-01-21 00:00:00Conference: 10 May 2010, Institute of Physics, London, United Kingdom. Organized by Professor J J Baumberg and Professor B Barnes.Frequency and Temperature Dependences of Dielectric Dispersion and Electrical Properties of Polyvinylidene Fluoride/Expanded Graphite Composites
Updated: 2010-01-19 15:57:34A conductive nanofiller, expanded graphite (EG), was introduced into polyvinylidene fluoride (PVDF) by direct melt blending process. The electrical conductivity and dielectric properties of resulting PVDF/EG composites were investigated in a wide range of frequencies from 102 to 108 Hz. The dielectric dispersion and conductivity of the composite system exhibited a strong frequency dependence particularly in the vicinity of percolation threshold (Φc=6 vol%). Moreover, the dielectric permittivity tended to decrease with increasing frequency while the conductivity displayed a reverse trend. A large permittivity was found in the composite having EG content near Φc. Accordingly, percolation concept and biased random walk approach can be used to describe the carrier tran...SNAP 2010 Naples Training School on NanoPhotonics
Updated: 2010-01-19 00:00:00School: 17 May 2010 - 21 May 2010, Naples, Italy.Lehigh Microscopy School
Updated: 2010-01-19 00:00:00Course: 6 Jun 2010 - 18 Jun 2010, Bethlehem, PA, United States.CLEO/QELS: 2010
Updated: 2010-01-19 00:00:00Conference/exhibition: 16 May 2010 - 21 May 2010, San Jose, California , United States.The biocompatibility of Pluronic((R))F127 fibrinogen-based hydrogels.
Updated: 2010-01-18 23:00:00In this study, our goal was to engineer a temperature-responsive biomaterial to possess bioactive properties using polymer and protein chemistry, and at the same time provide the biomaterial with susceptibility to cell-mediated remodeling. Toward this goal, we developed a biomimetic material that can harness the bioactive properties of fibrinogen and the unique structural properties of Pluronic((R))F127. Pluronic((R))F127 is a synthetic block copolymer that exhibits reverse thermal gelation (RTG) in response to small changes in ambient temperature. We conjugated fibrinogen to Pluronic((R))F127 to create a biosynthetic precursor with tunable physicochemical properties based on the relationship between the two constituents. A hydrogel matrix was formed from the fibrinogen-F127 adducts by fre...MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Science and Engineering Indicators 2010 released by US National Science Board (NSB), Jan15.
Updated: 2010-01-18 11:18:00
: Materials Science and Engineering Defined Materials Science and Engineering : Durable Development , Sustainable Development,Physical,Chemical,Processing , Applications , R and D to Market , Smart Materials , Coatings , Micro-Nano Technology My professional profile on Linkedin About Me James ALEXANDER I am an honours graduate , senior Metallurgist Materials Scientist and Engineer turned Consultant and Blogger , Bilingual English-French Read my weblog and post a comment is certainly the best way to get to know . me Comments are Mediated . Confidentiality can be guaranteed , as requested during mediating , for example if english is a foreign language and leads to unnecessary difficulty entirely free english communication help provided Life’s tough enough . So avoid SPAM FRANCAIS : écrit , lu et . parlé Commentaires en français acceptés , alors , n'hésitez pas , si cela vous rendre la vie plus facile . Work assignments will be given full consideration-Etudie toutes propositions de travail . MY LOCALITY MAP View my complete profile Click , Share , Grab Build YOUR Own Wowzio grab this education blog Get the Materials Science and Engineering Defined widget and many other great freeSimultaneous and Gradient IPN of Polyurethane/Vinyl Ester Resin: Morphology and Mechanical Properties
Updated: 2010-01-17 15:27:49A series of polyurethane (PU) and vinyl ester resin (VER) simultaneous and gradient interpenetrating polymer networks (represented as s-IPN and g-IPN, resp.) curing at room temperature were prepared by changing the component ratios of PU or VER in s-IPN, time intervals, and component ratio sequences of s-IPN in g-IPN. The microstructures of s-IPN and g-IPN were detected by atomic force microscope (AFM), dynamic mechanical analyzer (DMA), and surface constitution scanning of nitrogen element of energy dispersive X-ray spectrum (EDX), respectively. The mechanical properties of s-IPN and g-IPN were studied by values in strain-stress curves detected by electronic multipurpose tester. The results indicated that the morphology and mechanical properties are both affected by PU/VER component ratio...Conversations-on-Innovations: Apologies to IE users
Updated: 2010-01-14 16:17:00Conversations-on-Innovations: Apologies to IE users
Bioactive glass nanofibers produced
Updated: 2010-01-11 13:45:24A team of scientists from the University of Vigo, Rutgers University in the United States and Imperial College London, in the United Kingdom, has developed "laser spinning", a novel method of producing glass nanofibres with materials. They have been able to manufacture bioglass nanofibres, the bioactive glass used in regenerating bone, for the first time........Modern techniques to study ancient modern humans
Updated: 2010-01-11 13:45:24DNA that is left in the remains of long-dead plants, animals, or humans allows a direct look into the history of evolution. So far, studies of this kind on ancestral members of our own species have been hampered by scientists' inability to distinguish the ancient DNA from modern-day human DNA contamination. Now, research by Svante Pbo from The Max-Planck Institute for Evolutionary Anthropology in Leipzig, published online on December 31st in Current Biology a Cell Press publication overcomes this hurdle and shows how it is possible to directly analyze DNA from a member of our own species who lived around 30,000 years ago........The osteogenic properties of CaP/silk composite scaffolds.
Updated: 2010-01-10 23:00:00Authors: Zhang Y, Wu C, Friis T, Xiao Y The rationale for the present study was to develop porous CaP/silk composite scaffolds with a CaP-phase distribution and pore architecture better suited to facilitate osteogenic properties of human bone mesenchymal stromal cells (BMSCs) and in vivo bone formation abilities. This was achieved by first preparing CaP/silk hybrid powders which were then incorporated into silk to obtain uniform CaP/silk composite scaffolds, by means of a freeze-drying method. The composition, microstructure and mechanical properties of the CaP/silk composite scaffolds were ascertained by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), scanning electron microscope (SEM) and a universal mechanical testing machine. BMSCs were cultured in these scaffol...MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Electroconductive hydrogels: Synthesis, characterization and biomedical applications.
Updated: 2010-01-06 23:00:00Authors: Guiseppi-Elie A Electroconductive hydrogels (ECHs) are composite biomaterials that bring together the redox switching and electrical properties of inherently conductive electroactive polymers (CEPs) with the facile small molecule transport, high hydration levels and biocompatibility of cross-linked hydrogels. General methods for the synthesis of electroconductive hydrogels as polymer blends and as polymer co-networks via chemical oxidative, electrochemical and/or a combination of chemical oxidation followed by electrochemical polymerization techniques are reviewed. Specific examples are introduced to illustrate the preparation of electroconductive hydrogels that were synthesized from poly(HEMA)-based hydrogels with polyaniline and from poly(HEMA)-based hydrogels with polypyrro...An in vitro multi-parametric approach to measuring the effect of implant surface characteristics on cell behaviour
Updated: 2010-01-06 23:00:00Author(s): J T Davies, J Lam, P E Tomlins and D MarshallAffiliation(s): LGC, Queens Road, Teddington, Middlesex, TW11 0LY, UK; National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK (Source: Biomedical Materials)A novel calcium phosphate ceramic–magnetic nanoparticle composite as a potential bone substitute
Updated: 2010-01-06 23:00:00Author(s): Yao Wu, Wen Jiang, Xiantao Wen, Bin He, Xiaobo Zeng, Gang Wang and Zhongwei GuAffiliation(s): National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, People's Republic of China (Source: Biomedical Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.Conversion of borate-based glass scaffold to hydroxyapatite in a dilute phosphate solution
Updated: 2010-01-06 23:00:00Author(s): Xin Liu, Haobo Pan, Hailuo Fu, Qiang Fu, Mohamed N Rahaman and Wenhai HuangAffiliation(s): Institute of Bioengineering and Information Technology Materials, Tongji University, Shanghai 200092, People's Republic of China; Department of Materials Science and Engineering, and Center for Bone and Tissue Repair and Regeneration, Missouri University of Science and Technology, MO 65409, USA; Department of Orthopaedics and Traumatology, University of Hong Kong, Hong Kong 999077, People's Republic of China (Source: Biomedical Materials)Impact of trace elements on biocompatibility of titanium scaffolds
Updated: 2010-01-06 23:00:00Author(s): R Sabetrasekh, H Tiainen, J E Reseland, J Will, J E Ellingsen, S P Lyngstadaas and H J HaugenAffiliation(s): Department for Biomaterials, Faculty of Dentistry, University of Oslo, PO Box 1109 Blindern, 0317 Oslo, Norway; Department of Materials Science and Engineering, Institute of Glass and Ceramics, University of Erlangen-Nurnberg, Henkestr. 91, 91052 Erlangen, Germany; Faculty of Dentistry, Oral Research Laboratory, University of Oslo, PO Box 1109 Blindern, 0317 Oslo, Norway (Source: Biomedical Materials)Physical surface and electromechanical properties of doped polypyrrole biomaterials.
Updated: 2010-01-04 23:00:00Authors: Gelmi A, Higgins MJ, Wallace GG Conducting polymers doped with biomolecules (biodopants) are becoming more widely evaluated for use as biomaterials. The use of biodopants is intended to enhance the compatibility of the polymers, however their effect on the physical properties of the final composite material has generally been less of a consideration. Here, we have characterised the physical surface properties of polypyrrole substrates doped with extracellular matrix and non-biological molecules using Atomic Force Microscopy (AFM) and Electrochemical AFM (EC-AFM) techniques. The physical parameters of the differently doped films ranged between 5 and 32nm for the RMS roughness, 30-1000MPa for the Young's modulus, and 1.6-4.7% for the actuation strain. It was found that irrespect...