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排序方式: 共有150条查询结果,搜索用时 15 毫秒
1.
Virginija Sacevičienė Milda Jucienė Vaida Dobilaitė Valentina Krylova Skirma Žalenkienė Nijolė Dukštienė Raimondas Bliūdžius 《应用聚合物科学杂志》2019,136(21):47523
The aim of this work was to investigate the physical and mechanical performance of architectural polyester (PES)–poly(vinyl chloride) (PVC) membranes exposed to different artificial aging conditions. Two commercially available architectural membranes were chosen as research objects. The durability of the PES/PVC fabrics was evaluated by the loss in mechanical performance, scanning electron microscopy, and X-ray diffraction analysis in order to understand the effect of the degradation agents on the surface of the membranes. The mechanical performance of the PES/PVC membranes was unchanged. Scanning electron microscopy images of the tested materials showed initial cracks after aging. The X-ray fluorescence analysis showed that at the time of aging, the amount of Cl and Si decreased slightly, while Ti decreased by half, and Ca by volume increased twice. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47523. 相似文献
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Edita Zubrytė Danutė Kaušpėdienė Romas Ragauskas Rima Binkienė Aušra Selskienė 《分离科学与技术》2020,55(16):2855-2868
ABSTRACT A non-hazardous groundwater treatment waste (GWTW) was examined as a low-cost sorbent for Pb(II) and Cu(II) ions. The content of the dominant elements in GWTW was as follows: 78% Fe2O3, 7.4% P2O5, 7.4% CaO and 5.2% SiO2. The removal of Pb(II) and Cu(II) was fast, and more than 67–95% of ions were accumulated by GWTW during the first 3 min. The sorption capacity of GWTW depends on solution pH, concentration and temperature. Equilibrium data fitted well with Langmuir–Freundlich and Langmuir-partition models. The inherently formed nano-adsorbent could be utilized for the treatment of water contaminated with Pb(II) and Cu(II) ions. 相似文献
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A. Balčiūnaitė Z. Sukackienė K. Antanavičiūtė J. Vaičiūnienė A. Naujokaitis L. Tamašauskaitė-Tamašiūnaitė E. Norkus 《International Journal of Hydrogen Energy》2021,46(2):1989-1996
Effective Co/Cu, CoB/Cu, and CoBM (M = Mo,Zn,Fe)/Cu catalysts were prepared on the copper surface by a simple electroless deposition method using a morpholine borane as a reducing agent in the glycine solution. The activity of the deposited catalysts was investigated for hydrogen generation from an alkaline sodium borohydride solution. It was determined that these synthesized catalysts demonstrated the catalytic activity for the hydrolysis reaction of NaBH4. The lowest obtained activation energy (EA) of the hydrolysis reaction of NaBH4was 27 kJ mol?1 for the CoBMo/Cu catalyst. The hydrogen generation rate of 15.30 ml min?1 was achieved using CoBMo/Cu catalysts at 313 K and it increased ~3.5 times with the increase of temperature to 343 K. The highest hydrogen generation rate obtained by CoBMo/Cu films may be related to the hierarchical cauliflower-shaped 3D structures and the high roughness surface area. Moreover, the CoBMo/Cu catalyst showed an excellent reusability. 相似文献
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Scientometrics - The concept of Earth system science denotes a shift in the scientific discourse from disciplinary accounts of isolated components of the global environment towards the holistic and... 相似文献
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Danguolė Raklevičienė Regina Losinska Danguolė Švegždienė 《Microgravity science and technology》2011,23(2):227-233
Responses of cress (Lepidium sativum L.) seedling leaves to separate and simultaneous illumination with red (660 nm) and far-red (735 nm) light were studied under
fast clinorotation (50 rpm) and usual gravity (1g) conditions. The monochromatic light emitting diodes (LEDs) have been used
for illumination of seedlings from above. The growth and spatial orientation of leaves and the location of presumable gravisensors
in petioles were analysed. Clinorotation in the dark promoted the radial expansion of leaf lamina and unfolding of leaves.
It was shown that clinorotation in red light inhibited significantly the elongation of petioles as compared with that under
the action of gravity force. Simultaneous red and far-red illumination promoted the growth of petioles under clinorotation,
but did not affect the orientation of laminas, which remained the same as of the 1-g control ones. Red light, applied separately
and simultaneously with far-red light, guided the bending of laminas as well as the unfolding of leaf petioles in both usual
and clinorotation conditions. Histological and cytological analyses of petioles revealed the presence of movable amyloplasts
in endodermic cells in proximal region of petioles. Comparison of intracellular positioning of amyloplasts in petioles of
leaves grown under clinorotation and the action of gravity allows a presumption that these plastids may be identified as gravisensors
of garden cress leaves. The obtained data imply that clinorotation and exposition to monochromatic red light or simultaneous
illumination by red and far-red light affect the elongation of petioles of cress seedling leaves. Spectral components guide
the unfolding of laminas in a gravity-independent manner. 相似文献
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Rasa Kazakevičiūtė‐Makovska Safa Mogharebi Holger Steeb Gunther Eggeler Klaus Neuking 《Advanced Engineering Materials》2013,15(8):732-739
Experimental study of temperature‐ and frequency‐dependent properties of the commercially available shape memory polymer Tecoflex? EG 72D (TFX) (Lubrizol, USA) using dynamic mechanical analysis (DMA) technique is presented. Temperature scan DMA tests have been carried out in three distinct deformation modes, uniaxial tension, three‐point bending, and simple torsion, using two different testing rigs at different test parameters (frequency, strain amplitude, and heating rate) in temperatures ranging from below to above the glass transition temperature. The influence of different test parameters and some discrepancies in the temperature‐dependent storage and loss moduli (and hence the loss factor) measured by DMA in different deformation modes are discussed. 相似文献