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331.
BaMnZnCoTi-W型铁氧体微波吸收特性的研究 总被引:2,自引:1,他引:1
对用Co2+,Ti4+置换Fe3+的BaMnZn-W型平面六角晶系微波铁氧体吸收材料的制备和吸收性能进行分析研究,发现涂层厚度为1.06mm在7-12GHz频率范围内有三个吸收峰,峰值最高达34dB以上;同时比较了在相同工艺条件下,随着Co2+,Ti4+含量的增加,材料的吸收频率特性和涂层厚度的关系。 相似文献
332.
HUANG Yanhong LUE Huibin GUO Haizhong LIU Lifeng HE Meng CHEN Zhenghao ZHOU Yueliang ZHAO Kun JIN Kuijuan YANG Guozen 《科学通报(英文版)》2006,51(16):2035-2037
Strontium titanate (SrTiO3) has been widely used as substrates for growing perovskite oxides thin films be- cause SrTiO3 is chemically and compositionally stable, and has small lattice mismatch with many perovskite oxides[1―3]. It is known that SrTiO3 it… 相似文献
333.
334.
自激活自倍频Nd_xY_(1-x)Al_3(BO_3)_4复合功能晶体生长及光学特性 总被引:1,自引:0,他引:1
本文报导了自激活自倍频 Nd_xY_(1-x)Al_3(BO_3) _4复合功能晶体的生长,测量了该晶体的双折射率,计算了位相正配角和测定了该晶体的非线性系数。首次获得了该晶体从1. 06μm 到0. 53μm 受激发射和自倍频的激光运转。 相似文献
335.
本文主要应用文献[4]的方法,给出了序列|V(n)|的若干新奇的恒等式及一些数论性质。 相似文献
336.
Isolation,purification and characterization of a new organphosphorus hydrolase OPHC2 总被引:1,自引:0,他引:1
WUNingfeng DENGMinjie SHIXiuyun LIANGGuoyi YAOBin FANYunliu 《科学通报(英文版)》2004,49(3):268-272
A bacterium with the capability of degrading organphosphorus, identified as Pseudomonas pseudoaicaligenes, is isolated from OP-treated soil. The organphosphorus hydrolase OPHC2 from this bacterium has been purified and characterized. OPHC2 has optimum activity for the reaction at 65℃ and pH 9.0 with methyl parathion as a substrate, it also shows good thermal and pH stability. Most metal ions and chemicals have no effect on the activity of OPHC2. The analyses of nucleotide sequence encoding OPHC2 and amino acid sequence of OPHC2 show that there are lower homologies with those of organphosphorus hydrolase reported in GenBank. 相似文献
337.
JIANGYanxia CHENWei LIAOHonggang JINLanying SUNShigang 《科学通报(英文版)》2004,49(15):1581-1585
Dispersed Pd nanoparticles (Pdn) have been synthesized by reducing H2PdCI4 with ethanol, and stabilized using poly(vinylpyrrolidone) (PVP). The Pdn is applied to the glassy carbon substrate to form a thin film, and then the potential cyclic scanning at 50 mV.s^-1 from -0.25 to 1.25 V was carried out for about 30 min to form the aggregations of Pdn (Pdn^ag). FTIR spectroscopy of both transmission and reflection modes was employed to study CO adsorption on Pdn and Pdn^ag in both solidlliquid and solidlgas interfaces. It has been revealed that CO adsorption on Pdn film yields two IRbands near 1964 and 1906 cm-1, which are assigned to IR absorption of CO bonded on asymmetric and symmetric bridge sites, respectively. In contrast to the IR properties of CO adsorbed on Pdn, only species of CO bonded on asymmetric bridge sites was determined on Pdn^ag, and the direction of the IR band near 1963 cm^-1 is completely inverted. The full width at half-maximum (FWHM) of the COB^as band near 1964 cm^-1 is measured to be 14 cm^-1 on Pdn film, while it is 24 cm^-1 on Pdn^ag film. The results of the present study demonstrated that the inverting of the IR band direction is a general phenomenon that is closely related to the interaction between nanoparticles in aggregation of Pdn. 相似文献
338.
JiangCong-sheng WangTao DingQing-jun HuangShao-long WangFa-zhou GengJian HuShu-guang 《武汉大学学报:自然科学英文版》2004,9(3):348-352
The influence of polymer addition on microstructure, performance and mechanical properties of lightweight aggregate concrete was investigated. It was found that the addition of polymer improved the performance and mechanical properties of lightweight aggregate concrete. It was ascertained that the modification of microstructural uniformity and densification with the addition of polymer is responsible for the enhancement of mechanical properties.With respect to compressive strength and bending strength, the lightweight aggregate concrete added with 13% ethylene-acetate ethylene interpolymer ( EVA ) exhibits preferred mechanical properties. 相似文献
339.
分析了Sirofil纺纱过程中“V”形区的动态变化及粗纱须条与长丝间距大小对“V”形区形状和单纱受力的影响,认为间距增大会使“V”形区夹角增大、单纱段长度变长,并以此为依据,保持其他工艺参数不变,改变粗纱与长丝间距大小,试纺Sirofil纱,通过理论分析和实验比较讨论间距大小对Sirofil成纱结构性能的影响。结果表明:随着间距增大,成纱直径系数趋小、毛羽减少、强伸性与条干均呈非单调性变化;综合考虑成纱结构和性能,在其他参数相同时,Sirofil最佳成纱间距为12~16mm。 相似文献
340.
机械化保护性耕作对土壤理化性质的影响 总被引:7,自引:0,他引:7
郭新荣 《农业系统科学与综合研究》2007,23(2):158-160
机械化保护性耕作技术在山西临汾开展研究已经有多年了。在试验区,土壤物理化学性质发生了变化,这些变化给作物的生长提供了良好的土壤环境条件,同时改善了区域环境。通过对13年的保护性耕作试验区与传统土壤耕作技术试验区的对比试验,结果表明:机械化保护性耕作技术可更有效地提高土壤的蓄水量,每年蓄水量平均增加率为17%、每年土壤有机质平均增加0.065%,耕作层土壤的密度减小了10.07%,耕层内SO4^2-含量、Cl^-含量分别减少了11.045%和21.839%。图1,表4,参5。 相似文献