5,641 research outputs found
Bladder instillation of Escherichia coli lipopolysaccharide alters the muscle contractions in rat urinary bladder via a protein kinase C-related pathway.
No full textUropathogenic Escherichia coli alters muscle contractions in rat urinary bladder via a nitric oxide synthase-related signaling pathway.
No full textPublisher's Note: Electronic Structure and Optical Properties of Layered Perovslotes Sr2MO4 (M=Ti, V, Cr, and Mn): An ab initio study [Phys. Rev. B 74, 205112 (2006)]
Full text link学術論文 (Article)See Also: Original Article: Hongming Weng, Y. Kawazoe, Xiangang Wan, and Jinming Dong, Electronic structure and optical properties of layered perovskites Sr2MO4 (M=Ti, V, Cr, and Mn): An ab initio study, Phys. Rev. B 74, 205112 (2006).journal articl
Inhibition of NADPH oxidase-related oxidative stress-triggered signaling by honokiol suppresses high glucose-induced human endothelial cell apoptosis.
No full textDevelopment of a Self-assembly Technique for Drug-Delivering Hydroxyapatite Coatings for Ti-Based Implants
No full textPhD 2010 QMTo facilitate the long term osteointegration of Ti implants of various forms,
methods aiming to facilitate hydroxyapatite deposition and enhance its adhesion to
the Ti surfaces have to be developed. This work investigates the novel route of Ti
surface functionalization with self-assembled monolayers (SAMs) in order to
facilitate hydroxyapatite deposition and strengthen its bonding with the Ti surface and
further equip the surface with localized antibiotic delivery to combat
post-implantation infections. The main findings demonstrate that the formation of
SAMs on non-model Ti substrates is challenging, since it requires the simultaneous
control of many factors to achieve a densely packed well-organized SAM on a large
surface area. By pre-treating the substrate with techniques such as electropolishing,
the initial surface contamination can be kept at minimum while the hydroxylated
surface remains smooth for the formation of well-oriented SAMs. Hence, after
electropolishing, the Ti surface could be functionalized with molecules carrying
reactive or neutral groups to facilitate hydroxyapatite deposition and/or antibiotic
immobilization. Such a surface functionalization is found to facilitate hydroxyapatite
deposition. The hydroxyapatite formed on SAM-modified Ti surfaces is made of
small crystals of 6 nm and a 12 μm thick hydroxyapatite film, which can grow in 1
month. The SAM modified surfaces are covered with hydroxyapatite spheres in less
than 7 days, while no spheres are observed on the unmodified Ti surface under
similar conditions. Enhanced hydroxyapatite deposition rates on SAM-modified
surfaces are explained by a decrease of nucleation barrier for hydroxyapatite.
Additionally, preliminary investigations demonstrate the possibility of further
functionalizing the Ti surface to allow the immobilization of antibiotic (Ciprofloxacin
here) simultaneously with hydroxyapatite growth. The release of Ciprofloxacin was
found to occur after 1 day and continue up to 20 days. The combination of these two
functionalities on the Ti surfaces could find applications in load-bearing implants
Guo chao san yuan ti yong [2 juan].
No full textjuan 1 Weng Fanggang bian--juan 2 kong Chuanlun bian.Mode of access: Internet
Lateral Inverse Proximity Effect in Ti/Au Transition Edge Sensors
No full textWe report measured Tc of superconducting Ti/Au bilayer strips with a width W varying from 5 to 50 µm. The strips were fabricated based on a Ti/Au bilayer that consists of a 41-nm-thick Ti layer to which a 280-nm-thick Au layer was added. We find that the Tc drops as W decreases and the declining trend almost perfectly follows Tc/ [mK] = - 738.4 [μ m] 2/ W2+ 91.0 , where Tc(W= ∞) of 91 mK is consistent with the intrinsic Tc of the bilayer. The result is interpreted as a consequence of the lateral inverse proximity effect originated in normal-metal microstructures, namely Au overhangs that exist at the edges of the Ti/Au bilayer. The Tc shift from the intrinsic Tc should be anticipated in addition to the longitudinal proximity effect from superconducting Nb leads when one designs Ti/Au TESs.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.ImPhys/Optic
Revealing the influence of Mo addition on interphase precipitation in Ti-bearing low carbon steels
No full textMo is widely used as an effective microalloying element to improve mechanical performance of interphase precipitation steels, but the precise role of Mo in interphase precipitation behavior is not fully understood. In this contribution, interphase precipitation behavior in a series of Ti-Mo-bearing low carbon steels is systematically studied, and the role of Mo in interphase precipitates and its coarsening behavior is revisited. It is found that (Ti, Mo)C precipitates instead of TiC are formed in the Mo-containing alloys, and the average site fraction of Mo in (Ti, Mo)C is almost independent of the bulk Mo content. Moreover, the number density of interphase precipitates can be substantially enhanced by a minor addition of Mo, albeit it does not further rise with increasing the bulk Mo content. This is because the Mo fraction in (Ti, Mo)C rather than the bulk Mo content governs the driving force for precipitation nucleation and the interfacial energy of the (Ti, Mo)C/α and (Ti, Mo)C/γ interfaces. In addition to the reduced interfacial energy, decrease of Ti trans-interface diffusivity has been identified as another key reason for the enhanced carbide coarsening resistance in Mo-containing alloys.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
The Structure and Photocatalytic Function of Hydroxyapatite with Doped Ti (IV) Ion
Full text linkP(論文)Hydroxyapatite (HAp) has a molecular structure in which Ca^, PO_4^ and OH^- are major components. When hydroxyapatite is formed the Ca^, PO_4^ and OH^- ions can be substituted with other specific ions. When a specific ion is purposely replaced in the forming hydroxyapatite crystal, there is a possibility that the new hydroxyapatite might demonstrate properties that could be attributed to the substituted ion. This change in hydroxyapatite properties has been demonstrated when F^- has been substituted for OH^-, F^- has significant acid resistance. The acid resistance property of F^- was observed when F^- was substituted for OH^- in hydroxyapatite. Therefore, the author performed the following experiment : The first portion of the experiment was the synthesis of HAp using the coprecipitation method substituting Ti^ for Ca^. The Ti^ was doped to the Ca^ position in the forming hydroxyapatite crystal. In the next phase of this experiment the author analyzed whether the HAp had obtained photocatalytic function that is a major character of Ti^. HAp using the coprecipitation method was synthesized with different concentrations of Ti^. Respectively the HAp was prepared with Ti^ concentrations of 0.01, 0.005, 0.0025 and 0 moles. The determination of the elementary composition of the synthesized TiHAp was investigated with ICP analysis. The structure of the TiHAp crystal was also investigated by X-ray diffraction. The TiHAp was irradiated by ultraviolet light to determine and measure the presence of photocatalytic function. The formation of radicals and their strength were also measured by ESR spin trapping. A specimen was prepared with 1% TiHAp combined with polypropylene and a second specimen was prepared with 1% TiHAp combined acrylic denture base resins. These specimens were then investigated by a facilitated deterioration exposure test. The photocatalytic function of each specimen was also investigated. The following conclusions of the experiment were obtained : 1. The X-ray diffraction of the TiHAp showed a. reversed correlative phenomenon when anatase dioxide titanium was at 25° (2θ) and the peak strength of HAp was at 26° (2θ) due to the doped Ti^. Therefore, the observed change in the HAp must be a consequence of the doped Ti^ into the HAp molecule. The mole ratio of the Ca/P in the synthetic substance showed that the Ti^ concentration was dependent on the successful doping of Ti^ for Ca^. It was observed that the more successful the dope of Ti^ for Ca^ the mole ratio showed a rectilinear decrease. Therefore, this observation confirmed that Ti^ had replaced Ca^. 2. The OH radical was identified from the post ultraviolet irradiated synthesized substance. The strength of the OH radical increased when the success of the substitution of Ti^ for Ca^ increased. 3. The observation of a clear OH radical signal by ultraviolet irradiation was confirmed from the outer layers of both the polypropylene and acrylic denture base resins that had been combined with 1 % of the synthesized TiHAp. It was observed that there was delayed depletion in the resins that had been combined with the synthesized TiHAp. The results of this experiment provided these conclusions : When a desired concentration of Ti^ has been successfully substituted for Ca^ in a synthesized hydroxyapatite crystal the newly synthesized HAp obtained photocatalytic function that is a special characteristic of titanium.departmental bulletin pape
Inbound and outbound trucks scheduling at crossdocks:
No full textIn today’s customer driven economy, moving products quickly, efficiently, and cost effectively offers crucial advantages to companies. To achieve these goals, more and more companies are finding that cross-docking can play an integral part in their distribution model by partially replacing or complementing existing warehousing facilities. Crossdocking is a material handling and distribution operation, which moves products quickly and directly from inbound trucks (ITs) to outbound trucks (OTs) through the crossdock facility where products are being resorted or consolidated, without being stored or only with a short-term storage, usually within 24 hours or sometimes only within one hour.
This research deals with the scheduling of both ITs and OTs at a crossdocking facility where three objectives are considered: The first objective is to minimize the starting and handling time of all ITs; the second objective is to minimize the total weighted distance of pallets traveled inside the crossdock facility; and the third objective is to minimize the total departure time of all OTs. Multi-objective mixed-integer program formulations are built in order to address the problem. Justification for the use of these objectives in optimizing cross-dock operations is given. Different models are built for three different door layouts at crossdocking facility.
Since the problems are NP-hard, we consider the problem size limitations to obtain an exact solution. In addition, a restriction-approximation approach to solve the models is proposed and the efficiency of our approximation method is proved based on generated data. Finally, numerical examples are provided using the mathematical models built and the approximation approaches. Results for different layouts and scenarios are compared to evaluate the characteristics of different crossdock layouts.M.S.Includes bibliographical references (p. 129-133)by Ti Zhan
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