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Varietal difference in the correlation between leaf nitrogen content and photosynthesis in rice(Oryza sativa L.) plants is related to specific leaf weight 被引量:6
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作者 LIU Xi LI Yong 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2016年第9期2002-2011,共10页
Increasing leaf photosynthesis per area(A) is of great importance to achieve yield further improvement. The aim of this study was to exploit varietal difference in A and its correlation with specific leaf weight(SL... Increasing leaf photosynthesis per area(A) is of great importance to achieve yield further improvement. The aim of this study was to exploit varietal difference in A and its correlation with specific leaf weight(SLW). Twelve rice cultivars, including 6 indica and 6 japonica varieties, were pot-grown under two N treatments, low N(LN) and sufficient N(SN). Leaf photosynthesis and related parameters were measured at tillering stage. Compared with LN treatment, A, stomatal conductance(g_s), mesophyll conductance(g_m), leaf N content(N_(area)), and chlorophyll content were significantly improved under SN treatment, while SLW and photosynthetic N use efficiency(PNUE) were generally decreased. Varietal difference in A was positively related to both g_s and g_m, but not related to N_(area). This resulted in a low PNUE in high N_(area) leaves. Varietal difference in PNUE was generally negatively related to SLW. Response of PNUE to N supply varied among different rice cultivars, and interestingly, the decrease in PNUE under SN was negatively related to the decrease in SLW. With a higher N_(area), japonica rice cultivars did not show a higher A than indica rice cultivars because of possession of high-SLW leaves. Therefore, varietal difference in A was not related to N_(area), and SLW can substantially interfere with the correlation between A and N_(area). These findings may provide useful information for rice breeders to maximize A and PNUE, rather than over reliance on N_(area) as an indicator of photosynthetic performance. 展开更多
关键词 specific leaf weight leaf nitrogen content leaf photosynthesis mesophyll conductance photosynthetic nitrogen use efficiency stomatal conductance
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Directional solidification and physical properties measurements of the zinc-aluminum eutectic alloy 被引量:3
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作者 S.Engin U.Byük +1 位作者 H.Kaya N.Maraslι 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第6期659-664,共6页
Zn-5wt% Al eutectic alloy was directionally solidified with different growth rates (5.32-250.0μm/s) at a constant temperature gradient of 8.50 K/mm using a Bridgman-type growth apparatus.The values of eutectic spac... Zn-5wt% Al eutectic alloy was directionally solidified with different growth rates (5.32-250.0μm/s) at a constant temperature gradient of 8.50 K/mm using a Bridgman-type growth apparatus.The values of eutectic spacing were measured from transverse sections of the samples.The dependences of the eutectic spacing and undercooling on growth rate are determined as λ=9.21V-0.53 and ΔT=0.0245V0.53,respectively.The results obtained in this work were compared with the Jackson-Hunt eutectic theory and the similar experimental results in the literature.Microhardness of directionally solidified samples was also measured by using a microhardness test device.The dependency of the microhardness on growth rate is found as Hv=115.64V0.13.Afterwards,the electrical resistivity (r) of the casting alloy changes from 40×10-9 to 108×10-9 Ω·m with the temperature rising in the range of 300-630 K.The enthalpy of fusion (ΔH) and specific heat (Cp) for the Zn-Al eutectic alloy are calculated to be 113.37 J/g and 0.309 J/(g·K),respectively by means of differential scanning calorimetry (DSC) from heating trace during the transformation from liquid to solid. 展开更多
关键词 eutectic alloys directional solidification microhardness electrical conductivity enthalpy specific heat
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Interlayer transport of an electron in bilayer graphene with phonon-induced lattice distortion in the presence of biased potential
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作者 何良明 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期477-481,共5页
The interlayer transport of an electron in bilayer graphene influenced by a phonon in the presence of a biased potential is investigated using the tight-binding approach. The in-plane optical mode E2g and out-of-plane... The interlayer transport of an electron in bilayer graphene influenced by a phonon in the presence of a biased potential is investigated using the tight-binding approach. The in-plane optical mode E2g and out-of-plane optical mode B1g associated with the applied biased potential are considered to compute and discuss the interlayer transport probability of an electron initially localized on the bottom layer at the Dirac point in the Brillouin zone. Without the biased potential, the interlayer transport probability is equal to 0.5 regardless of the phonon displacement except for a few special cases. Applying a biased potential to the layers, we find that in different phonon modes the function of the transport probability with respect to the applied biased potential and phonon displacement is complex and various, but on the whole the transport probability decreases with the increase in the absolute value of the applied biased potential. These phenomena are discussed in detail in this paper. 展开更多
关键词 electronic transport conductivity of specific materials
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Study on rare earth electrolyte of SDC 被引量:1
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作者 严端廷 刘晓梅 +5 位作者 刘倩 王浩鹏 徐江红 齐松 郑敏章 苏文辉 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第6期914-916,共3页
The grain boundaries of polycrystalline oxygen ion conductors presented a blocking effect on the oxygen ionic transport across them. It was found that the apparent specific grain boundary conductivity was 2-3 orders o... The grain boundaries of polycrystalline oxygen ion conductors presented a blocking effect on the oxygen ionic transport across them. It was found that the apparent specific grain boundary conductivity was 2-3 orders of magnitude lower than the bulk conductivity in the temperature range of 200-500 °C for normal purity Ce0.85Sm0.15O1.925 (SDC) with an average grain size of 320-580 nm. The apparent specific grain boundary conductivity increased with decreasing average grain size. It was found that the space charge potential was nearly independent of grain size, and the reason was analyzed. The increase of the conduction path width was responsible for the increase in the apparent specific grain boundary conductivity. 展开更多
关键词 CERIA siliceous phase apparent specific grain boundary conductivity space charge potential rare earths
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