5,949 research outputs found
Water quality deterioration after roof-top storage: implications on their maintenance and management
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Occurrence of haloacetic acids (HAAs) and trihalomethanes (THMs) in drinking water of Taiwan
No full textProgress on in-vessel poloidal field coils optimization design for alternative divertor configuration studies on the EAST tokamak
No full textThis is the accepted manuscript (post-peer reviewed) of the following final paper: "Xiao, B.J., Luo, Z.P., Li, H., Li, G.Q., Wang, L., Wang, Z.L., Xu, G.S., Yao, D.M., Zhou, Z.B., Calabrò, G., Crisanti, F., Castaldo, A., Lombroni, R., Minucci, S., Ramogida, G., Progress on in-vessel poloidal field coils optimization design for alternative divertor configuration studies on the EAST tokamak, (2019) Fusion Engineering and Design, 146, pp. 2149-2152, https://doi.org/10.1016/j.fusengdes.2019.03.126
The complete chloroplast genome and phylogenetic analysis of Corydalis fangshanensis W.T. Wang ex S.Y. He (Papaveraceae)
No full textThe complete chloroplast (cp) genome of Corydalis fangshanensis W.T. Wang ex S.Y. He, a Chinese endemic plant with limestone-specific distribution was first reported. The cp genome was circular in structure and 192,554 bp in length, consisting of a large single copy region (LSC, 98,393 bp), two inverted repeat regions (IRs, 42,263 bp), and a small single copy region (SSC, 9,635 bp). The overall GC content of the genome was 40.26%. It encoded 112 unique genes, including 78 protein-coding genes, 30 tRNA genes, and 4 rRNA genes. Phylogenetic analysis resolved C. fangshanensis was closely related to C. saxicola G.S. Bunting within Corydalis sect. Thalictrifoliae (Fedde) Lidén, in line with morphological character-based taxonomy. Our result provides informative data for studying the taxonomy, phylogeny and ecology of Corydalis, especially species with specific-limestone distribution and also for studying the adaptive evolution in plants
Sediment exchange between flats and channels in tidal inlets
No full textThe subject of this thesis is the sediment exchange between channels and flats in tidal inlets. This topic is part of a research scheme which must yield more insight into the dynamic equilibrium of tidal inlets. An important aspect of the sediment exchange is the drying and flooding of the flats during the tide. The oscillating water level gives rise to velocity variations which cause stirring and settling of sediment. In nature, tidal inlets are large and complex systems, the dimensions of which vary continuously due to natural effects (tide, storms, sea level rise). For the purpose of this study a schematised tidal inlet is considered, with dimensions as occurring in the Dutch Wadden Sea. In this schematisation, the bottom ofthe channel and the tidal flats is fixed. The schematisation is used as a starting point to model the water and sediment motion during a few tidal cycles. Subsequently the output of each model run, i.e. velocities, water depths and concentrations, is used to estimate the sediment transport during ebb and flood, respectively. The transport is calculated in points along a line perpendicular to the channel axis. Model runs are executed in one and two dimensions. Sediment transport rates according to power law formula (l-D and 2-D cases) and according to a suspended sediment equation (l-D cases only) are compared. The suspended sediment fluxes at the flat agree well with the sediment transport rates determined by the power law formula. In some of the I-D runs, it appears that problems occur around the transition from the flat to the channel. Very large values of the transport rate, much larger than those in the adjacent cells, result from a thin water film with relatively high velocities. Therefore, the sediment transport model is provided with a water depth threshold preventing this. The threshold hardly influences the sediment transport rates during flood, either suspended or by power law, because the front of the wave is rather steep. The sediment transport rates during ebb, however, for which the threshold was meant, are reduced, such that the transport rate approaches the values in the surrounding points. The parameters which have been chosen to vary in the I-D model runs are: the slope of the tidal flat, in order to investigate whether an equilibrium profile of the tidal flat is possible, and to investigate the net transport over the landward edge of the flat if the flat is relatively steep, the (a)symmetry ofthe imposed water level in order to compare the results of a symmetric boundary condition to the results of a flood-dominant condition; the water level in the channel changes with time towards the end ofthe channel, the tidal amplitude and the length ofthe tidal flat, in order to assess how they are related to the sediment transport.Hydraulic EngineeringCivil Engineering and Geoscience
Rare-earth ions doped transparent oxyfluoride glass-ceramics
No full textIn recent years, rare-earth ions doped transparent oxyfluoride glass-ceramics have attracted great attentions for their low phonon energy environments of fluoride nanocrystals and high chemical and mechanical stabilities of oxide glassy matrix. In this chapter, firstly, the crystallization behaviors of the transparent glass ceramics containing CaF2 nanocrystals are presented to demonstrate the controllable microstructure evolution of nano-composites. Secondly, the optical properties of the newly developed transparent glass-ceramics containing β-YF3 nanocrystals are systematically reviewed. The rare-earth ions are inclined to partition into the YF3 nanocrystals after crystallization. Through variation of the rare-earth doping and control of the microstructures, the glass-ceramics could exhibit high-stimulated emission cross-section, broadband near infrared emission, high efficient ultraviolet upconversion emission and bright white light emission, indicating their potential multifunctional applications in solid state laser, upconversion, optical amplifier, three-dimensional display, and so on
All-optical multi-level phase quantization based on phase sensitive amplification with low-order harmonics
No full textA novel scheme is proposed for all-optical multi-level phase quantization by mixing two lower-order harmonics, rather than mixing the signal with its conjugate (M−1)th harmonic, which is difficult to be generated but necessary for the traditional quantization method. The low-order harmonics used in the proposed scheme are determined as the conjugate (M/2−1)th and the (M/2+1)thharmonics for M=4n , or the conjugate (M/2−2)th and the (M/2+2)th harmonics for M=4n+2, or the conjugate [(M−1)/2]th and the [(M+1)/2]th harmonics for M=2n+1, n=1,2,3…The simulations show the effectiveness of the scheme for the eight- and nine-level all-optical phase quantization. Furthermore, the application of the scheme to the all-optical phase regeneration is validated. An improved method with two cascading stages is also proposed and validated to achieve a monotonic step-like phase–phase transfer characteristic for the optimized all-optical phase quantization. This proposed scheme provides a new way for multi-level phase quantization and multi-level phase shift keying regeneration to meet the ever increasing demand for the bandwidth in fiber optic communications
Packaged silica and chalcogenide microspheres and their applications for telecommunications
No full textObjective: To investigate, both theoretically and experimentally, packaged silica and chalcogenide microsphere and their potential applications in telecommunication
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