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排序方式: 共有501条查询结果,搜索用时 15 毫秒
51.
Wang Wenhai Tesio Alvaro Y. Olivares-Marín Mara Gómez Romero Pedro Tonti Dino 《Journal of Materials Science》2022,57(28):13403-13413
Journal of Materials Science - A simple route has been developed for the preparation of mesoporous graphitic carbons with embedded cobalt nanoparticles just using glycine as a nitrogen source,... 相似文献
52.
53.
Energy Harvesting: Electric Field Assisted Microfluidic Platform for Generation of Tailorable Porous Microbeads as Cell Carriers for Tissue Engineering (Adv. Funct. Mater. 20/2018) 下载免费PDF全文
54.
Marcus A. OMara Sean P. Ogilvie Matthew J. Large Aline Amorim Graf Anne C. Sehnal Peter J. Lynch Jonathan P. Salvage Izabela Jurewicz Alice A. K. King Alan B. Dalton 《Advanced functional materials》2020,30(32)
Here, an approach is presented to incorporate graphene nanosheets into a silicone rubber matrix via solid stabilization of oil‐in‐water emulsions. These emulsions can be cured into discrete, graphene‐coated silicone balls or continuous, elastomeric films by controlling the degree of coalescence. The electromechanical properties of the resulting composites as a function of interdiffusion time and graphene loading level are characterized. With conductivities approaching 1 S m?1, elongation to break up to 160%, and a gauge factor of ≈20 in the low‐strain linear regime, small strains such as pulse can be accurately measured. At higher strains, the electromechanical response exhibits a robust exponential dependence, allowing accurate readout for higher strain movements such as chest motion and joint bending. The exponential gauge factor is found to be ≈20, independent of loading level and valid up to 80% strain; this consistent performance is due to the emulsion‐templated microstructure of the composites. The robust behavior may facilitate high‐strain sensing in the nonlinear regime using nanocomposites, where relative resistance change values in excess of 107 enable highly accurate bodily motion monitoring. 相似文献
55.
High niobium oxide content in germanate glasses: Thermal,structural, and optical properties 下载免费PDF全文
Lia Mara Marcondes Sérgio Maestri Bianca Sousa Rogeria Rocha Gonçalves Fabia Castro Cassanjes Gael Yves Poirier 《Journal of the American Ceramic Society》2018,101(1):220-230
Niobium alkali germanate glasses were synthesized by the melt‐quenching technique. The ternary system (90‐x)GeO2–xNb2O5–10K2O forms homogeneous glasses with x ranging from 0 to 20 mol%. Samples were investigated by DSC and XRD analysis, FTIR and Raman spectroscopy, and optical absorption. Structural and physical features are discussed in terms of Nb2O5 content. The niobium content increase in the glass network strongly modifies the thermal, structural and optical properties of alkali germanate glasses. DSC, Raman and FTIR analysis suggest niobium addition promotes NbO6 groups insertion close to GeO4 units of the glass network. XRD analysis also pointed out that samples containing high niobium oxide contents exhibit preferential niobium oxide‐rich phase after crystallization after heat treatment, which is similar to orthorhombic Nb2O5. Absorption spectra revealed high transmission range between 400 nm to 6.2 μm, added to a considerably decreased hydroxyl group content as the addition of niobium in the alkali germanate network. The niobium oxide‐rich phase crystallization process was studied and activation energy was determined, as well as nucleation and crystal growth temperatures and time for obtaining transparent glass‐ceramics. 相似文献
56.
Pyrolysis of sugarcane bagasse in a fixed bed reactor: Influence of operational conditions in the distribution of products 下载免费PDF全文
57.
D. D. Mara PhD DSc Eurlng CEng FICE CBiol FIBiol FRIPH 《Water and Environment Journal》2004,18(4):230-234
The design of septic tanks, constructed wetlands, waste-stabilisation ponds and rock filters is detailed, and their applicability in the UK is discussed. Septic tanks are a suitable primary treatment system for villages with a population of less than 500. Constructed wetlands, which are secondary or tertiary treatment units, have the disadvantage that their plants do not play any significant role in their performance, except for nitrogen removal. Secondary facultative waste-stabilisation ponds, with pre-treatment in septic tanks and post-treatment in rock filters, provide primary, secondary and tertiary treatment and can produce high-quality effluents. The costs of these processes for small rural communities in the UK are compared. 相似文献
58.
D. D. Mara BSc PhD Eurlng CEng FICE CBiol FIBiol C. A. Cogman MEng P. Simkins MEng M. C. A. Schembri MSc 《Water and Environment Journal》1998,12(4):260-264
The Burwarton Estate waste stabilization ponds, near Bridgnorth, Shropshire, serve a population of 150. There are three ponds in series: a facultative pond, and two equal maturation ponds, followed by two parallel and alternately used constructed wetland ditches. This paper describes the design of the ponds and reports upon their performance during the first two years of operation. 相似文献
59.
Removal of As(V) and Cr(VI) from aqueous solutions using solid waste from leather industry 总被引:2,自引:1,他引:1
Oliveira DQ Gonçalves M Oliveira LC Guilherme LR 《Journal of hazardous materials》2008,151(1):280-284
This study evaluated the feasibility of using a solid waste from the leather industry as an adsorbent for removal of Cr(VI) and As(V) from aqueous media. The adsorbent material was characterized by chemical analyses, infrared spectroscopy, and scanning electronic microscopy (SEM) prior to reaction in order to assess its surface properties. Langmuir and Freundlich equations were used for analyzing the experimental data, which showed a better fit to the Langmuir model, thus suggesting a monolayer adsorption process in the surface of the adsorbent. The high amounts of Cr(VI)-133 mg g(-1) and As(V)-26 mg g(-1) adsorbed demonstrates the great potential for using this solid waste from the leather industry as a low-cost alternative to the traditionally used adsorbent materials. 相似文献
60.
Peter Deibert Daniel König Mara Z Vitolins Ulrike Landmann Ingrid Frey Hans-Peter Zahradnik Aloys Berg 《Nutrition journal》2007,6(1):1-7