We propose a novel memory configuration using tunable barrier and estimate its frequency response to engineer ever fast and robust nonvolatile memory devices. A quantum-classical approach proves that the lifetime of t...
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Microcellular biomorphous Al2O3 was produced by Al-vapor infiltration in pyrolyzed rattan and pine wood-derived biocarbon preforms. At 1600°C the biocarbon preforms reacted with gaseous aluminum to form Al4C3. Af...
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The aim of this study was to investigate the interealtions between the design, processing and properties of hydroxyapatite-poly(lactide) composites intended as biodegradable bone grafts for joining fractured bone tiss...
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ISBN:
(纸本)9781605603209
The aim of this study was to investigate the interealtions between the design, processing and properties of hydroxyapatite-poly(lactide) composites intended as biodegradable bone grafts for joining fractured bone tissues. Poly(lactide) fibers were employed to increase the axial strength and toughess of the composite. The hydroxyapatite nano rods are also aligned in the axial direction during the pultrusion process to increase the low-strain modulus of the composite. The resulting composite with a composition of HA: PCL: PLA= 3: 34: 63 (vol%) had a tensile modulus of 6.6 GPa.
In the present work our attention was focused on the obtaining photoelectrodes for photoelectrochemical cell that incorporate two electrodes, one of which has been titania (TiO2) coated on a transparent conducting oxi...
In the present work our attention was focused on the obtaining photoelectrodes for photoelectrochemical cell that incorporate two electrodes, one of which has been titania (TiO2) coated on a transparent conducting oxide (TCO), referred to as the primary electrode and the other, the counter electrode, a non-corrosive metal such as a thin layer of platinum. A thin layer of a nanoporous TiO2 semiconductor was deposited onto a sheet of ITO conducting glass (sheet resistance ~ 30 Ωcm−2). Several complementary investigation techniques like BET, SEM and XRD were used to follow the influence of the reactants molar ratio and thermal treatment on the TiO2 photoanode. The nanocrystalline TiO2/ITO conducting glass electrode seems to be a promising photoanode in a photoelectrochemical cell for hydrogen generation by water splitting.
The spin-forbidden reaction 1HNO(1A')+OH-→3NO-(3Σ-)+H2O has been extensively explored using various CASSCF active spaces with MP2 corrections in several basis sets. Natural bond orbital (NBO) analysis, together ...
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The spin-forbidden reaction 1HNO(1A')+OH-→3NO-(3Σ-)+H2O has been extensively explored using various CASSCF active spaces with MP2 corrections in several basis sets. Natural bond orbital (NBO) analysis, together with the NBO energetic (deletion) analysis, indicates that the two isomers have nearly equal total energy and could compete with each other in the title reaction. More significantly, the singlet/triplet surface crossing regions have been examined and the spinorbit coupling (SOC) and energetics have been computed. The computational results indicate that the SOC is very large at the crossing point T1/S0 trans (ca.40.9 cm-1). Moreover, the T1/S0 trans has a low energy of 10.67 kcal/mol relative to that of trans-S0. Therefore, the surface crossing to the triplet state seems much more efficient at the T1/S0 trans region along the minimum energy path (MEP), However, The values of single (P1ISC) and double (P2ISC) passes estimated at T1/S0 trans show that the ISC occurs with a little probability.
The final coating structure is important in terms of coating gloss and opacity, print gloss, and ink setting characteristics. Much empirical experience has moved coatings towards optimum levels, but when there is a ra...
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ISBN:
(纸本)1595101748
The final coating structure is important in terms of coating gloss and opacity, print gloss, and ink setting characteristics. Much empirical experience has moved coatings towards optimum levels, but when there is a raw material change or grade change, there is much expense in predicting the final coating structure. Many recent computer models have advanced our abilities to predict coating structure from particle packing models, but little has been done to describe the calendering operation that is known to determine coating gloss. Here, a particle level model to describe the compression of pigments to simulate the calendering operation is proposed. Particles are placed into a structure with a drainage flow field and compressed with a row of particles that represent the calender surface. The results are compared to pilot scale experiments for two pigment size distributions. The gloss increase due to calendering and the pore size distributions are well predicted before and after calendering. The modeling technique should help predict the gloss response of coating suspensions with various pigment size distributions.
A theoretical study of the reaction path for the photo-ring-open mechanism for a model system 2H-pyran has been carded out using a CASSCF method. To monitor the electronic rearrangements along the minimum energy pathw...
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A theoretical study of the reaction path for the photo-ring-open mechanism for a model system 2H-pyran has been carded out using a CASSCF method. To monitor the electronic rearrangements along the minimum energy pathway (MEP), the electronic structures were analyzed using valence bond (VB) theory and natural bond orbital (NBO) analysis. Calculated results show that the S0-Min, the absorption of the initial excitation, promotes the sys-tem to the S1 excited state with a (π-π*) character. From the S1-Min, a low-barrier path leads to an S1/S0 conical in-tersection. The energy of the S1/S0 crossing is located 0.63 eV below the S1-Min. Thus, the initial movement of the nuclei will lead the system through the S1/S0 crossing to the ground state of the S0-Prod in a very efficient nonadia-batic path along the MEP.
Biosensor technology includes the detection of generated biological functionality. One whole-cell biosensor concept leaves specific receptor molecules in their natural environment to be optimized and adapted for effic...
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ISBN:
(纸本)0930815866
Biosensor technology includes the detection of generated biological functionality. One whole-cell biosensor concept leaves specific receptor molecules in their natural environment to be optimized and adapted for efficient molecular recognition during evolution, and to use intact cells as biologically-active elements. In this project, a basic nanomaterials platform for whole cell sensors is produced by electrospinning composite nano- and microfiber networks. The resulting polymer-metal oxide (titania) "nano-mats" are fabricated on a conductive indium tin oxide (ITO) coated glass substrate for epithelial or other cell incubation and future incorporation into bioelectronics. Impedance spectroscopy is used to characterize cell interactions with the nano-mat to detect changes in cells with proliferation or when exposed to chemical stimuli, such as lactic acid. Cell response to media conditions can include growth, attachment and s preading, motility and migration, and cell death.
In an offset printing process, the ink film splitting event has some relationship to the tack forces experienced by the paper and has an important impact on formation of ink filaments. The filament size and its distri...
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ISBN:
(纸本)9781605605104
In an offset printing process, the ink film splitting event has some relationship to the tack forces experienced by the paper and has an important impact on formation of ink filaments. The filament size and its distribution are expected to influence the leveling of ink and hence impact ink setting, the print gloss dynamics and the print quality. However, ink filaments are difficult to image due to their short life time and fine length scale. Limited work has been reported on the parameters that influence filament size and methods to characterize this size. This work attempts to image ink filament remains and to quantify some of their characteristics such as height and diameter as other parameters, such as printing speed, ink amount and fountain solution type are changed. Printed samples were prepared using a laboratory printability tester at varying ink level and operating settings. Influence of printing speed, ink grammage and fountain solution were probed. Rhodamine B dye was incorporated into fountain solutions to aid the detection of them. The prints were then imaged with a Confocal Laser Scanning Microscope (CLSM) and images were further analyzed for their surface topography. Modeling of the pressure pulses in the printing nip is included in order to better understand the mechanism of filament formation and the origin of filament length scale. Printing speed and ink amount changed the size distribution of the observed filament remains. Addition of different fountain solutions, with or without isopropyl alcohol, did not have a significant influence on observed filament remain patterns.
Gold nanorods were used as molecularly targeted contrast agents for two-photon luminescence imaging of cancer cells 160 μm inside a tissue phantom. Nanorod labeled cells exhibit three orders of magnitude brighter sig...
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