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  • 1
    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: TiO2 is one kind of semiconductor-based photocatalyst. TiO2 shows relatively high reactivity and chemical stability under ultraviolet (UV) light. However TiO2 is poor absorber of photons in the solar spectrum. In order to improve the absorption efficiency, the coatings of TiO2/ZnFe2O4, ZnFe2O4and TiO2on ITO were prepared by dip coating method, their microstructure, surface properties, photocurrent and photo absorption are investigated in this paper. XRD results show that the phases on the composite coatings are mainly TiO2 and ZnFe2O4 and the main phase on ZnFe2O4 and TiO2 coatings is ZnFe2O4 andTiO2 respectively, the SEM results show that the coatings of TiO2 and TiO2/ZnFe2O4 are distributed evenly on the materials surface and the AFM results show that the grain size is about 20nm. The experimental results also show that the absorption wavelength of composite coatings of TiO2/ZnFe2O4 is 454nm, which is larger than that of TiO2 coatings (370nm). Under the irradiation of Xe lamp light, aphotocurrent of 27µA/cm2 on the materials surface could be obtained
    Type of Medium: Electronic Resource
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  • 2
    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: To improve its visible light response capability, a new narrow bandgap zinc ferritesemiconductor was in-situ introduced into the matrix of titanium dioxide nano film. ZnFe2O4 doped TiO2composite films have been successfully formed on glass and stainless steel substrates from aqueoussolution through equilibrium reaction between iron (III)-titanium (IV)-fluoric complex and boric acid,followed by in-situ hydrothermal conversion and crystallization in the Zn2+-contained basic environment.The obtained films were densely packed and had no visible cracks; clear photovoltaic responses wereobserved in the anodic direction, and they were much larger in the presence of ferrite dopant. It issuggested that the shift of the corrosion potential was ascribed to photo-induced charge separationbetween the conduction band of ZnFe2O4 and its counterpart TiO2 nano-particles
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  • 3
    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
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2203-2206 
    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: TiO2 is one kind of semiconductor-based photocatalyst. TiO2 shows relatively high reactivityand chemical stability under ultraviolet (UV) light. However TiO2 is a poor absorber of photons in visiblelight. In order to improve the absorption efficiency, the coatings of TiO2/WO3, WO3 and TiO2 on ITOwere prepared by liquid phase deposition (LPD) and dip coating method, their microstructure, surfaceproperties, photoelectrochemical properties are investigated in this paper. XRD results showed that thephases on the composite coatings are mainly anatase, rutile and WO3 respectively, the SEM resultsshowed that the coatings of TiO2 and TiO2/WO3 are distributed evenly on the materials surface. Theelectrochemical experiment results showed that open circuit potential of TiO2 and TiO2/WO3 withpresence of the UV light illumination were about -343 mV and –650 mV respectively, comparatively therest potential of 304 stainless steel is about 48 mV, which means that the TiO2 or TiO2/WO3 coatings canprotect 304 stainless steel from corrosion, and TiO2/WO3 coatings retained for a while anticorrosion evenabsence of UV light
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1910-1913 
    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: Ag doped TiO2 whiskers were synthesized by calcining metatitanic acid with potassium car=bonate to form tetratitanate whisker precursor, following by proton-exchanged and immobilized with Ag+.The post treatment conditions for whiskers synthesis were investigated and the phase composition,morphology and photocatalytic performance were characterized. The results showed that the TiO2whiskers had an aspect ratio more than 15 and the absorption edge of Ag doped titania whiskers were redshifted to 50 nm. The result of methylene blue degradation revealed that the photocatalytic performance ofAg doped TiO2 whisker has been greatly improved
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  • 6
    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: Anodic aluminum oxide (AAO) is commonly used as a starting template for fabrication ofseveral kinds of functional nanoscale devices due to its homogeneous nanohole structure with high aspectratio. In this paper, high density and uniform titanium dioxide nanotube array films were prepared vialiquid phase deposition method by immersing the AAO templates in an aqueous ammonium hexafluorotitanatesolution. The phase and microstructure of the nanotube array films were characterized by X-raydiffraction and field-emission scanning electron microscopy. It was found that the mean inner diametersof nanotube are 40-100 nm, mainly depended on different templates and post treatment condition; thephase of as-deposited TiO2 array film was amorphous, while it became anatase at above 400°C
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2019
    Description: In this study, a new joint formation combined with a two-part underwater towed vehicle (towfish) with multiple autonomous underwater vehicles (AUVs) was investigated. A triangular structure formation was established based on graph theory, in which the main point is the secondary towed vehicle acting as the “leader,” and the other two points are AUVs acting as “followers.” The excellent real-time performance and high flexibility of the towfish is highlighted, and the communication delay and fixed routine of AUVs can be avoided simultaneously. As to the obstacle avoidance, the null-space-based behavioral approach is proposed. On the basis of this approach, the formation task moving to the target is decomposed into different subtasks, and the obstacle avoidance subtask is set as the highest priority. The vector of the low-level task is projected to the null space of the high-level task vector, and the integrated task output is used as the final output function. The low-level task is partially or completely accomplished while handling the higher task; therefore, the mutual conflict between different level targets can be avoided. Moreover, the corresponding task functions are designed in accordance with different subtask priorities. The comprehensive output function of formation motion is deduced and established to ensure that obstacles can be avoided effectively. Furthermore, simulation results demonstrate the effectiveness and feasibility of the proposed method in a complex underwater environment with obstacles.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI
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  • 8
    Publication Date: 2018-07-13
    Description: The damping material topology optimization problem of structural-acoustic radiation is discussed. According to the artificial material hypothesis, a novel optimization approach of the damping materials distribution method is introduced. The mathematical formulation about damping material topology optimization is established. Finally, a hexahedral box structures for example, the distribution topology optimization method is illustrated. With topology optimization, material conversion between damping and artificial materials is achieved. Numerical results indicate that the proposed artificial material hypothesis for topology optimization is effective and feasible.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Publication Date: 2016-09-01
    Description: Traditional sensor nodes are usually battery powered, and the limited battery power constrains the overall lifespan of the sensors. Recently, wireless power transmission technology has been applied in wireless sensor networks (WSNs) to transmit wireless power from the chargers to the sensor nodes and solve the limited battery power problem. The combination of wireless sensors and wireless chargers forms a new type of network called wireless rechargeable sensor networks (WRSNs). In this research, we focus on how to effectively deploy chargers to maximize the lifespan of a network. In WSNs, the sensor nodes near the sink consume more power than nodes far away from the sink because of frequent data forwarding. This important power unbalanced factor has not been considered, however, in previous charger deployment research. In this research, a power balance aware deployment (PBAD) method is proposed to address the power unbalance in WRSNs and to design the charger deployment with maximum charging efficiency. The proposed deployment method is effectively aware of the existence of the sink node that would cause unbalanced power consumption in WRSNs. The simulation results show that the proposed PBAD algorithm performs better than other deployment methods, and fewer chargers are deployed as a result.
    Electronic ISSN: 1996-1073
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 10
    Publication Date: 2014-08-25
    Description: Ecological stoichiometry provides a powerful tool for integrating microbial biomass stoichiometry with ecosystem processes, opening far-reaching possibilities for linking microbial dynamics to soil carbon (C) metabolism in response to agricultural nutrient management. Despite its importance to crop yield, the role of phosphorus (P) with respect to ecological stoichiometry and soil C sequestration in paddy fields remains poorly understood, which limits our ability to predict nutrient-related soil C cycling. Here, we collected soil samples from a paddy field experiment after 7 years of superphosphate application along a gradient of 0, 30, 60, 90 (P-0 through P-90, respectively) kg P ha-1 y-1 in order to evaluate the role of exogenous P on soil C sequestration through regulating microbial stoichiometry. P fertilization increased soil total organic C and labile organic C by 1-14% and 4-96%, respectively, while rice yield is a function of the activities of soil ?-1, 4-glucosidase (BG), acid phosphatase (AP) and the level of available soil P through a stepwise linear regression model. P input induced C limitation as reflected by decreases in the ratios of C:P in soil and microbial biomass. An ecoenzymatic ratio indicating microbial investment in C versus P acquisition, i.e., ln(BG):ln(AP), changed the ecological function of microbial C acquisition and was stoichiometrically related to P input. This mechanism drove a shift in soil resource availability by increasing bacterial community richness and diversity, and stimulated soil C sequestration in the paddy field by enhancing C degradation-related bacteria for the breakdown of plant-derived carbon sources. Therefore, the decline in the C:P stoichiometric ratio of soil microorganism biomass under P input was beneficial for soil C sequestration, which offered a "win-win" relationship for the maximum balance point between C sequestration and P availability for rice production in the face of climate change. # doi:10.1890/14-0189.1
    Print ISSN: 1051-0761
    Electronic ISSN: 1939-5582
    Topics: Biology
    Published by Wiley on behalf of The Ecological Society of America (ESA).
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