6,880 research outputs found
Energy flux in isotropic turbulence under large variations of external forcing
No full textWe investigate the response of energy flux in isotropic turbulence to step-function like perturbation in external forcing at large length scales. From both physical experiments and direct numerical simulations, we measured the evolution of the Eulerian velocity structure functions, such as , , before and after the perturbation in forcing. In both cases, we observed the cascade of the energy excess at large scales cascade through scales to the dissipative range, which can be used to study the dynamics of the cascade, and in particular, to estimate the relevant time scales
Role of partial and gradient filling strategies of copper foam on latent thermal energy storage: An experimental study
No full textLow thermal conductivity of most phase change materials (PCMs) limits the practical application of latent thermal energy storage. This study aims to investigate the role of the partial and gradient filling strategies of copper foam on the heat transfer characteristic of latent thermal energy storage. A visual test rig was built to capture the evolution of the melting front over time. An infrared camera and T-type thermocouples measured the temperature fields and temperature profiles at specific points, respectively. The melting rate, temperature distribution and storage efficiency were investigated and analyzed in detail. The melting rate of PCM first increases and then decreases with the increase of filling ratio, and reaches the maximum value when the filling ratio is 5/6. The application of partial filling strategy reduces the maximum temperature difference of PCM and enhances the stability of the system. In the application of gradient filling strategy, copper foam with larger porosity should be arranged close to the heating wall or above the cavity. Partial and gradient strategy can increase the melting rate of PCM by reducing or maintaining the filling quantity of metal foam, which is of great significance for the practical application of metal foam in latent energy storage. (C) 2022 Elsevier Ltd. All rights reserved
Experimental study on heat transfer characteristics of metal foam/paraffin composite PCMs in large cavities: Effects of material types and heating configurations
No full textThis study explores the effects of material types and structural parameters of metal foam, and heating config-urations on the evolution of melting front, heat transfer characteristics, and temperature distribution of metal foam/paraffin composite phase change materials (PCMs) in large cavities. Copper and iron foams were used as the heat transfer enhancement medium, while paraffin with a melting point of 45 C was chosen as the PCM to store heat. This study identified the heat transfer regimes in large cavities during the melting process. The experimental results on different heating configurations indicated that different from small cavities, both con-duction and convection regimes played a fundamental role in the melting process. In addition, the heating configuration controlled the evolution of the melting front of the pure PCM and composite PCM. On the basis of these results, a non-dimensional correlation validated against a large dataset of experiments was fitted to model the melting process of the composite PCMs
Numbers of DEGs in LL vs. CC, LL vs. DD, and DD vs. CC.
No full textNumbers of DEGs in LL vs. CC, LL vs. DD, and DD vs. CC.</p
Contraceptive actions of Bin1b and LL-37 antimicrobial peptide : involvement of sperm sulfogalactosylglycerolipid (SGG)
No full textSulfogalatosylglycerolipid (SGG, aka sminolipid) is a sulfoglycolipid present selectively on the mammalian sperm suface. We ha shown that SGG is important for sperm-ZP/egg plasma membrane binding. Ironically, SGG ad its analog, sulfogalactosylceramide (SGC), which is present on the vaginal/cervical ephitelial cell surface, also have affinity for a number of microbes and virus and their surface proteins. The interaction with microbes and viruses with diverse consequences to the cells, however, may be prevented by the interaction of these sulfoglycolipids with cationic antimicrobial peptides(AMPs). We have recently demonstred the affinity of SGG/SGC for two AMPs, Bin1b (6 kDa) and LL-37 (3.7 kDa)are a b-defensin and a-defensin family member of AMPs, respectively. Both b-defensin and hCAP18, LL-37 precursor, are expressed in high amounts in the epididymis. However, since SGG exist in abundance on the sperm plasma membrane (10% of total lipids), mature caudal epididymal sperm could still receive more of these cationic AMPs onto the sperm surface, thes resulting in the masking of SGG. In fact, these AMP-treated mouse sperm had decreased ability to fertilize eggs in an AMP-concetration dependent manner, presumably due to the blocking of sperm SGG to interact with the ZP and egg plasma membrane. LL-37 had a greater potency in this inhibition than Bin1b. At 16 micro-g/ml of exogenous LL-37, sperm had zero ability to fertilize the eggs. In contrast, eggs were still fertilzed at 50% contol values when incubate with sperm treated with 106 micro-g/ml of Bin1b. The higher inhibitory action of LL-37 in fertilization was due to its adverse effects on sperm motility an viability. Regardless, LL-37 di not induce any cell death to both human vaginal and cervical epithelial cell lenes. Therefore, it is promising from our results that LL-37 and Bin1b could be used as vaginal non-hormonal contraceptives with additional microbicidal activity
FIGURE 5A–L in On three new oonopid species from China and the discovery of the male Orchestina bialata Liu, Xiao & Xu, 2016 (Araneae: Oonopidae)
No full textFIGURE 5A–L. Ischnothyreus tergeminus sp. nov., male paratype (OON 34), SEM views of sperm pore and palp. A. Abdomen, detail of sperm pore, ventral view. B. Left palp, prolateral view. C. Bulb tip of left palp, prolateral view, detail of LL. D. As previous, detail of CP and MO. E. Left palp, top view. F. As previous, top view, slightly lateral. G. Bulb tip of left palp, top view. H. Right palp, dorsal view. I. As previous, detail of bulb tip, dorsal view. J. Right palp bulb, ventrolateral view. K. As previous, bulb tip, detail of CA, ventrolateral view. L. As previous, detail of MO, ventrolateral view. Abbreviations: CA, coniform apophyses; CP, corniculate projections; LL, lamellar lobe; MO, membranous outgrowth; VPR, ventral protuberance. Scale bars: A, C, E−K, L, 10 µm; B, 20 µm; D, 3 µm.Published as part of Liu, Keke, Henrard, Arnaud, Xiao, Yonghong & Xu, Xiang, 2019, On three new oonopid species from China and the discovery of the male Orchestina bialata Liu, Xiao & Xu, 2016 (Araneae: Oonopidae), pp. 235-256 in Zootaxa 4701 (3) on page 242, DOI: 10.11646/zootaxa.4701.3.2, http://zenodo.org/record/355802
A robust correlation analysis framework for imbalanced and dichotomous data with uncertainty
No full textEffect of Al addition upon mechanical robustness and corrosion resistance of Mo(5)Si(3)/MoSi(2) gradient nanocomposite coatings
No full textA graded Al alloyed MoSi2/Mo5Si3 nanocomposite coating was prepared on a commercially pure titanium substrate by double cathode glow discharge. The adhesion strength of the resultant coatings to substrate was enhanced by the graded design and the formation of a wider transitional layer between the coating and substrate. Moreover, corrosion resistance of the coatings increased through the addition of Al. First-principle calculations revealed that Al additions raised the corrosion potential of both MoSi2 and Mo5Si3, and at the same time reduced the corrosion potential disparity between these two phases, thereby alleviating the occurrence of preferential corrosion. © 2013 Elsevier B.V.Jiang Xu, Linlin Liu, Zhengyang Li, Paul Munroe and Zong-Han Xi
Results of KEGG Pathway of Chinese mitten crab kept in LL vs. CC, LL vs. DD and DD vs. CC.
No full textResults of KEGG Pathway of Chinese mitten crab kept in LL vs. CC, LL vs. DD and DD vs. CC.</p
Natalia LL - artystka neoawangardowa
No full textThe paper shows Natalia Lach-Lachowicz (Natalia LL) as a neo avant-garde artist whose works in a specific maximalistic way are very close to the main currents of avant-garde trends: new mediality (photography), minimalism, conceptualism, performance, bodyart, pop-art, and feminist art. The author of the article concentrates mainly on the mutual influences of conceptualism, consumptionism, and feminism in Natalia LL’s works and pays attention to the emancipatory potential of her works of the seventies and the eighties
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