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solar energy converter
相关语句
  相似匹配句对
     Desalination with Solar Energy
     太阳能海水淡化技术
短句来源
     Solar—hydrogen energy
     太阳——氢能技术
短句来源
     The energy of the N-
     N粒子的散射态和束缚态的能量分别为
短句来源
     The energy of D.
     根部能量的积累随放牧强度的提高而逐渐减少。
短句来源
     Z-Source Converter
     Z源变换器
短句来源
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  solar energy converter
It functions as a bio-solar energy converter, catalyzing one of the first steps of oxygenic photosynthesis.
      


A hydrogenase in Spirulina Platensis, by which H_2 evolution activity was catalyzed, was inhibited by the presence of nitrate in the cultu remedium, due to the competition for electrons between nitrate reductase and hydrogenase. Hydrogenase and nit rate reductace activities in the medium with nitrate indicated that hydrogenase activity was inhibited, but that of nitrate reductase was increased. When Sp. platensis was suspended in medium without or with a little NO_3, the situation was reversed. However, the...

A hydrogenase in Spirulina Platensis, by which H_2 evolution activity was catalyzed, was inhibited by the presence of nitrate in the cultu remedium, due to the competition for electrons between nitrate reductase and hydrogenase. Hydrogenase and nit rate reductace activities in the medium with nitrate indicated that hydrogenase activity was inhibited, but that of nitrate reductase was increased. When Sp. platensis was suspended in medium without or with a little NO_3, the situation was reversed. However, the inhibition by nitrate can be partly overcome by the replacement of nitrate with urea. The addition of urea inhibited nitrate reductase activity, but promoted H_2-evolution. Therefore energy competition might exist between the two enzymes. Hydrogen-evolution activity doubled or redoubled as time went on. The hydrogen-evolution activity in the presence of N_2 and of Ar had increased by 244% and 287%, respectively, as compared to that in the presence of oxygen. Oxygen inhibited hydrogene evolution, the half inhibition of oxygen concentration was about 5%. 2% carbon monoxide inhibited the hydrogen-evolution by half. The activity could be completely stopped at an illumination intensity of more than 2000 1x. The contradiction between the photosynthetic oxygenevolution and hydrogen-evolution might be regulated by the oxidative respiration through the alternative treatment of light and darkness. The possibility of using Sp. platensis as an organism in biological solar energy converter for hydrogen production was discussed.

螺旋藻Spirulina platensis具有氢酶。由氢酶催化的放H_2活性受到培养基中硝酸盐的抑制。这是由于氢酶与硝酸还原酶之间存在还原能力的竞争。以脲素取代硝酸盐可以部分地解除其抑制作用。放H_2活性随着暗中时间的延长而成倍加强。在氮气或氩气中比在空气中的放氢活性分别高出244%和287%。氧气抑制放H_2活性,约5%O_2达到半抑制浓度。CO对,放H_2的半抑制浓度为2%。当光照强度大于2000lx时完全抑制放H_2活性。光合放氧与放氢的矛盾可以通过光、暗交替处理,由暗中的耗氧呼吸以加协调。

The discovery of fullerene offers opportunities to explore the beautiful chemistry on the fullerenes' curved surfaces and design novel fullerene-based materials for numerous applications. Another appeal of fullerenes is that it is possible to execute endohedral chemistry by the encapsulation of atoms or groups of atoms, creating the possibility of further control of the electronic structures and redox properties of fullerenes. Recently the main goals are on the synthesis, characterization, and applications of...

The discovery of fullerene offers opportunities to explore the beautiful chemistry on the fullerenes' curved surfaces and design novel fullerene-based materials for numerous applications. Another appeal of fullerenes is that it is possible to execute endohedral chemistry by the encapsulation of atoms or groups of atoms, creating the possibility of further control of the electronic structures and redox properties of fullerenes. Recently the main goals are on the synthesis, characterization, and applications of novel functional materials based on fullerene and metallofullerene derivatives. Some new research projects are proposed on the rational design of new fullerene/metallofullerene materials useful in chemosensors, solar energy converters and devices. The purpose of this paper is to provide a survey on the current development of the investigation on fullerene and its applications

富勒烯的三维空间构型和众多的双键为富勒烯科学的发展提供了广阔的空间,内嵌富勒烯则可以通过控制笼内包合的原子来调节富勒烯的电子结构和还原性质。目前,富勒烯的研究主要集中在富勒烯和金属富勒烯基新型功能材料的合成表征以及应用,其中以设计新的富勒烯/金属富勒烯材料用于化学传感器、太阳能电池及其它器件为主要研究焦点。旨在对目前富勒烯科学的发展与应用研究作一综述介绍。

The photoelectrochemical cells based on semiconductor-liquid junctions have attracted much attention because of their potential application, such as solar energy converters. In the cell system, it is important to produce the high efficiency photoelectrodes that are stable in aqueous solution and that absorb a significant portion of the solar spectrum effectively. Much effort has been done to find new materials and new electrode structures in order to produce efficient photoelectrodes. Along with...

The photoelectrochemical cells based on semiconductor-liquid junctions have attracted much attention because of their potential application, such as solar energy converters. In the cell system, it is important to produce the high efficiency photoelectrodes that are stable in aqueous solution and that absorb a significant portion of the solar spectrum effectively. Much effort has been done to find new materials and new electrode structures in order to produce efficient photoelectrodes. Along with its abundance and low cost, α-Fe2O3 has narrow band gap, strong absorptivity in the visible range and good stability in aqueous solution. So it has been of considerable interest in its use as a photocatalyst and a photoelectode. However, the photocurrent quantum efficiency of α-Fe2O3 is too low to limit its further application in converting solar energy. In general, recombination of electrons and holes cased by low mobilities of holes and trapping of electrons by oxygen-deficient iron sites are considered to be responsible for the low conductivities and poor photocurrent efficiencies of iron oxide photoelectrode.To suppress the recombination of electrons and holes thus to improve the photocurrent quantum efficiency, the semiconductor films of SrTiO3, α-Fe2O3 and their heterojunction SrTiO3/α-Fe2O3 were prepared on FTO (SnO2∶F on glass) substrates by the spin-coating method. The XRD pattern, SEM and transmission spectra of SrTiO3/α-Fe2O3 film photoanode were characterized in our experiments. The anodic photocurrent-potential characteristics and the action spectra were studied in a three-electrode cell employing the film electrode as the working electrode with the electrolyte Na2SO4(0.2 mol/L, pH≈7.5). It was found that under 0.3 V bias voltage, the photocurrent and the incident photon to current conversion efficiency (IPCE) of the SrTiO3/α-Fe2O3 film was higher than that of SrTiO3 or α-Fe2O3 films alone, which is consonant with our theoretical calculation conclusions by using the standard CASTEP package.

作为一类重要的光电极材料,α-Fe2O3在太阳能转化方面有着潜在的应用前景。但是,光生电子空穴对的再复合导致α-Fe2O3的光电量子产率很低。为了抑制光生电子空穴对的再复合,提高α-Fe2O3的光电量子产率,采用Spin-coating方法在透明导电玻璃FTO(SnO2∶F)衬底上制备了SrTiO3/α-Fe2O3异质结薄膜光电极,并对该光电极进行了XRD、SEM、紫外-可见透射光谱的表征。在三电极光电化学测试系统中对薄膜的光电流-电压特性、入射光子电流转化效率(Incident photon to current efficiency,IPCE)对波长的依赖性进行了表征。在相同的Xe灯照射条件下,SrTiO3/α-Fe2O3异质结光电极的光电流及IPCE值大于单一的SrTiO3、α-Fe2O3各自的光电流及IPCE值,这与理论预测的结论一致。

 
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