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Raffaele Vinai Fabrice Ntimugura Will Cutbill Robert Evans Yize Zhao 《International Journal of Applied Ceramic Technology》2022,19(3):1235-1248
Alkali activated binders are a promising alternative to the use of Portland cement in the manufacture of concrete for curbing CO2 emissions. Novel sources of silicates have been investigated in recent years for reducing cost and environmental impacts associated with the use of chemical activators. This study describes the production of solid sodium silicate (SS) activating powder from bamboo leaf ash (BLA). Bamboo leaves were calcined at 550–800°C, mixed with NaOH pellets, and heated in an oven at 300°C. The obtained silicate powder was used for activating blended fly ash/slag samples. Mechanical and microstructural properties of BLA-based samples were compared to those of samples made with commercially available chemicals. The strength of BLA-activated mortars matched the commercially-sourced activators, being 25–30 MPa at 7 days and exceeding 40 MPa at 28 days. The microstructural analysis suggested that BLA-based SS showed a lesser degree of dissolution of precursors at 7 days, but the quality of the matrix was higher than that of NaOH-activated samples. These results confirmed that the reactivity of BLA-silicate powder was similar to that of commercial SS solutions, and show the potential valorization of future biomass renewable waste in the production of low carbon, alkali-activated concretes. 相似文献
23.
Janine Will Lars Schneider Dr. Jonathan Becker Jun.-Prof. Dr. Sabine Becker Andreas Miska Christopher Gawlig Prof. Dr. Siegfried Schindler 《Israel journal of chemistry》2020,60(10-11):999-1003
A new tripodal imine ligand tris(2-(propan-2-ylideneamino)ethyl)amine (imine3tren) was prepared in order to stabilize high valent iron-oxido complexes. Iron complexes were synthesized in template reactions from iron(II) salts, tris(2-aminoethyl)amine (tren) and acetone. Due to the reversibility of the imine formation, complexes with different ligands were obtained depending on the reaction conditions. Three complexes, [Fe(imine3tren)(OAc)2] ( 1 ), [Fe(imine3tren)(OAc)]OTf ( 2 ) and [(imine3tren)2Fe2(F)2](SbF6)2 ( 3 ), could be synthesized and structurally characterized. However, reactions with hydrogen peroxide, iodosobenzene or ozone did not lead to any kind of “oxygen adduct” complex that could be spectroscopically observed. 相似文献
24.
Will Leftwicb 《建筑机械》2009,(10):40-42
<正>当租赁公司要削减费用时,必然要面临"有效管理"的问题。在做下一次费用削减之前,要问一问自己是否每次都能做出正确的决定。WL联合公司的Will Leftwich报道。 相似文献
25.
Tim Lynam John Drewry Will Higham Carl Mitchell 《Environmental Modelling & Software》2010,25(11):1291-1301
The development and use of a Bayesian Belief Network (BBN) model, within an adaptive management process for the management of water quality in the Mackay Whitsunday region of Queensland, Australia is described. The management goal is firstly to set achievable targets for water quality entering the Great Barrier Reef lagoon from the Mackay Whitsunday natural resource management region and then secondly to define and implement a strategy to achieve these targets. The BBN serves as an adaptive framework that managers and scientists may use to articulate what they know about the managed system. It then provides a tool to guide where, when and what interventions (including research) are most likely to achieve management outcomes. Importantly the BBN provides a platform for collective learning.BBN estimates of total suspended sediment (TSS) loads and event mean concentrations (EMCs) were compared to observed data and results from current best practice models. The BBN estimates were reasonable relative to empirical observations. Example results from the BBN are thereafter used to illustrate the use of the model in estimating the likelihood of exceeding water quality targets with and without proposed actions to improve water quality. Example results are also used to illustrate what spatial or land use elements might contribute most to exceeding water quality targets. Finally key limitations of the tool are discussed and important learnings from the process are highlighted. 相似文献
26.
Will Hadden 《国外电子元器件》2009,17(2):109-110
白光LED(SLED)能为便携式电子产品的显示器提供背光,最常见的是需要4V驱动电压的单个WLED,而单节锂电池平均电压为3.6V,因此在使用单节锂电池驱动WLED的情况下需用升压转换器。探讨WLED的低电流应用与对其正向电压的影响,并介绍TI的新款LED驱动器TPS7510。 相似文献
27.
Simplified protein models are used for investigating general properties of proteins and principles of protein folding. Furthermore,
they are suited for hierarchical approaches to protein structure prediction. A well known protein model is the HP-model of
Lau and Dill [Lau, K. F., & Dill, K. A. (1989)]. A lattice statistical mechanics model of the conformational and sequence
spaces of proteins. Macromolecules, 22, 3986–3997) which models the important aspect of hydrophobicity. One can define the HP-model for various lattices, among
them two-dimensional and three-dimensional ones. Here, we investigate the three-dimensional case. The main motivation for
studying simplified protein models is to be able to predict model structures much more quickly and more accurately than is
possible for real proteins. However, up to now there was a dilemma: the algorithmically tractable, simple protein models can
not model real protein structures with good quality and introduce strong artifacts.
We present a constraint-based method that largely improves this situation. It outperforms all existing approaches for lattice
protein folding in HP-models. This approach is the first one that can be applied to two three-dimensional lattices, namely
the cubic lattice and the face-centered-cubic (FCC) lattice. Moreover, it is the only exact method for the FCC lattice. The ability to use the FCC lattice is a significant
improvement over the cubic lattice. The key to our approach is the ability to compute maximally compact sets of points (used
as hydrophobic cores), which we accomplish for the first time for the FCC lattice. 相似文献
28.
Dr. Johann Bizer Prof. Dr. Rüdiger Grimm Prof. Dr. Andreas Will 《Datenschutz und Datensicherheit - DuD》2006,30(2):69-73
Zusammenfassung Die DRM-Diskussion ist festgefahren: Weil die Verwertungsindustrie ihre digitalen Rechte mit Hilfe von Technik und staatlichem
Zwang zu verteidigen versucht, verweigern sich die Nutzer. Diese Blockade ist nur aufzul?sen, wenn die digitalen Rechte der
Urheber auch an den Interessen der Nutzer und damit dem Datenschutz ausgerichtet werden. 相似文献
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