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  • 1
    Electronic Resource
    Electronic Resource
    Functionalized Tetrapod-Like ZnO Nanostructrures for DNA Gene Delivery (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 747-750 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Amino-modified tetrapod-like ZnO nanostructures were tried as novel carriers formammalian cell transfections. The nanostructures consisted of four needle-shaped tetrahedrallyarranged legs connected at the center. After silica coating and amino modification, ZnOnanostructures complexes bound plasmid DNA through electrostatic interactions in aqueous solution.When mixed with cells, DNA-nanostructures attached easily onto cell membranes and entered thecells for gene expressions. Due to high positive charge densities on surfaces and needle-shapedtetrahedral structures, functionalized ZnO used as carriers for cell transfections with both hightransfection efficiency and little cytotoxicity. And a possible transfection machamism was proposedin this report
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.747.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and Properties of Ternary Carbide Ti〈sub〉3〈/sub〉AlC〈sub〉2〈/sub〉 Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1221-1224 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Polycrystalline bulk samples of ternary carbide Ti3AlC2 ceramics were fabricated by reactivelyhot-pressing a mixture of Ti, Al, and graphite powders with and without Sn additive. The effects ofsintering temperature, time and addition of Sn on the purity, mechanical properties and microstructure ofTi3AlC2 were investigated. The result showed that the TiC content was strongly influenced by sinteringtemperature for the Ti3AlC2 samples without Sn additive, and the most suitable sintering temperature tocreate the lowest TiC content was 1400°C. The addition of Sn additive led to a distinct decrease in TiCcontent. The flexural strength of the testing materials had close relation with the TiC content and sinteringtime. A certain content of TiC second phase and longer sintering time were helpful to improving theflexural strength. The sample sintered at 1400°C for 2 h possessed the highest flexural strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1221.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Processing and Characterization of Carbothermal Reduction and Nitridation from Kaolinite-Polyacrylamide Intercalation Compound (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1093-1095 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The kaolinite-polyacrylamide intercalation compound was prepared by the displacement reactionof the kaolinite-formamide intercalation precursor with acrylamide and the polymerization under140°C for 15h with the catalysis of dibenzoyl peroxide. Sialon was synthesized from kaolinite-polyacrylamideintercalation compound by carbothermal reduction and nitridation (CRN) processing at 1400°C.The kaolinite-carbon mixture and its CRN product were also prepared for the comparison with the CRNresult of intercalation compound. XRD, FT-IR, and TEM were used to characterize the phases, structureand morphology of products. In the CRN product from the intercalation compound, β′-sialon is the mainphase. And the reduction and nitridation rate from the intercalation compound was greater than that fromthe mixture. There was higher sialon phase’s content and lower mullite phase’s content in the CRNproduct from the intercalation compound than that from the mixture. The CRN processing of kaoliniteintercalation compound is a novel and effective method of sialon synthesis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1093.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Titania Nanotubes Prepared by Templating Needle-Like Calcium Carbonate (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 539-542 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Titania nanotubes were successfully synthesized by a simple procedure with needle-likeCaCO3 as inorganic templates at a room temperature in nonaqueous system. Through the hydrolysisof tetrabutoxytitanium (TBOT), titania crystal nucleus were deposited on the CaCO3 nanoparticlesdue to heterogeneous nucleation, followed by aggregation condensation on the surface ofneedle-like CaCO3 cores and removal of CaCO3 to produce hollow titania nanotubes. Itsmorphological and structural properties were characterized by TEM, SEM, and XRD, respectively.The nanotubes have a uniform tubular hollow structure with one or two big openings ends, thelength of about 2.0 μm, the average inner diameters of 100-200 nm, respectively, and a wallthickness of approximately 40 nm. The phase formed was anatase after calcinations at 723 K for 2 hand nanotubes with hollow structure remained their original shapes, and the BET surface area ofas-synthesized titania nanotubes was 243.45 m2/g, and decreased to 144.76 m2/g after calcinations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.539.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    In Situ Visualization of Layer Transitions during Convective Self-Assembly in a Sessile Drop (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 31 (Nov. 2007), p. 117-119 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Convective self-assembly of colloidal spheres provides a simple method for fabricatingtwo and three dimensional colloidal crystals. In this work, we investigated the layer transitionsphenomena during colloidal self-assembly in a sessile drop by using an in-situ videoscopic set-up.The effects of surface charge, colloidal concentration, and surfactant additions were examined. Theresults show that the chemical environment plays an important role in colloidal self-assembly. Inthe case of ordered growth, different layer transition phenomena were observed when the colloidalconcentration is different
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.31.117.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Ionic Cluster Effect in Suppression on Superconductivity in Doped Y123 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2119-2121 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Positron annihilation technology and simulation analyses are used to investigate the dopedYBCO. The results suggest that Co ionic cluster effect is stronger than Al in YBCO. The cluster effectnot only causes the local electron density to reach the saturation, but also suppresses thesuperconductivity significantly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2119.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    An Arborescent Network Formulation and Dual Ascent Based Procedure for the Two-Stage Multi-Item Dynamic Demand Lotsize Problem (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 25 (1994), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Traditional approaches for modeling and solving dynamic demand lotsize problems are based on Zangwill's single-source network and dynamic programming algorithms. In this paper, we propose an arborescent fixed-charge network (ARBNET) programming model and dual ascent based branch-and-bound procedure for the two-stage multi-item dynamic demand lotsize problem. Computational results show that the new approach is significantly more efficient than earlier solution strategies. The largest set of problems that could be solved using dynamic programming contained 4 end items and 12 time periods, and required 475.38 CPU seconds per problem. The dual ascent algorithms averaged .06 CPU seconds for this problem set, and problems with 30 end items and 24 time periods were solved in 85.65 CPU seconds. Similar results verify the superiority of the new approach for handling backlogged demand. An additional advantage of the algorithm is the availability of a feasible solution, with a known worst-case optimality gap, throughout the problem-solving process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1994.tb00518.x
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  • 8
    Electronic Resource
    Electronic Resource
    The Impact of E-Replenishment Strategy on Make-to-Order Supply Chain Performance (2005)
    350 Main Street , Malden , MA 02148 , USA . : Decision Sciences
    Decision sciences 36 (2005), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This research investigates the impact of electronic replenishment strategy on the operational activities and performance of a two-stage make-to-order supply chain. We develop simulation-based rolling schedule procedures that link the replenishment processes of the channel members and apply them in an experimental analysis to study manual, semi-automated, and fully automated e-replenishment strategies in decentralized and coordinated decision-making supply chain structures. The average operational cost reductions for moving from a manual-based system to a fully automated system are 19.6, 29.5, and 12.5%, respectively, for traditional decentralized, decentralized with information sharing, and coordinated supply chain structures. The savings are neither equally distributed among participants, nor consistent across supply chain structures. As expected, for the fully coordinated system, total costs monotonically decrease with higher levels of automation. However, for the two decentralized structures, under which most firms operate today, counter-intuitive findings reveal that the unilateral application of e-procurement technology by the buyer may lower his purchasing costs, but increase the seller's and system's costs. The exact nature of the relationship is determined by the channel's operational flexibility. Broader results indicate that while the potential economic benefit of e-replenishment in a decentralized system is substantial, greater operational improvements maybe possible through supply chain coordination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.2005.00065.x
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  • 9
    Electronic Resource
    Electronic Resource
    Sintering and Dielectric Properties of Nano-BaTiO〈sub〉3〈/sub〉 Powder Synthesized by High-Gravity Reactive Precipitation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 53-56 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The dielectric properties and sintering activity of nano-BaTiO3 powders synthesized by HGRP method were investigated. The starting BaTiO3 powders were calcined at different temperatures from 700 to 900°C to improve their crystallinity and the mean particle size of BaTiO3 powders obtained increasedfrom 40nm to 80nm. After being formed by conventional dry pressing the green bodies were sintered at 1100°C and 1200°C for 2hr in air. The effects of both calcinating and sintering temperatures on the sinterability, dielectric property and microstructure of BaTiO3 ceramics were discussed. The experimental results showed that the BaTiO3 powders have high sintering activity and the highestdielectric constant of this material at room temperature may reach 2880
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.53.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Kaolinite-Glucose Intercalation Compound (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1068-1070 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Kaolinite-glucose intercalation compound was synthesized by the intercalation of polarorganic big molecule dodecylamine and then displaced by glucose in the layer of kaolinite. XRD, FT-IR,TG and DSC were used to study the reaction process and the characters of the products. The resultsindicated that the basal spacing of kaolinite increased to 2.280 nm from 0.717 nm, and the hydrogenbonds were formed between dodecylamine NH and kaolinite Si-O after dodecylamine intercalation.Kaolinite-dodecylamine intercalation compound was stable below 295 °C. After displacement reactionby glucose, the basal spacing of kaolinite increased to 3.364 nm, and the intercalation rate reached 87%,the hydrogen bonds were formed between glucose C=O and kaolinite inner surface hydroxyl.Kaolinite-glucose intercalation compound was stable below 302 °C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1068.pdf
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