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Phosphorus Uptake and Utilisation efficiencies of Different Wheat Cultivars Based on a Sand-Culture Screening System

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Pedosphere 2002年第4期12卷 329-337页

作者： N.K.howes S.e.SMITH ZHUYONGGUAN DepartmentofSoilandWater TheUniversityofAdelaideGlenOsmondSA5064（Australia） ResearchCentreforeco－environmentalSciences theChineseAcademyofSciencesBeijing100085（China） SouthAustraliaResearchandDevelopmentInstitute GlenOsmondSA5064（Australia）

A sand-based culture system using rock phosphate (P) was developed to simulate the situation in alkalinesoils, with respect to the dominant P form, and five wheat cultivars (excalibur, Brookton, Krichauff, Westoniaand Sunco) were tested in this screening system to compare their P uptake and utilisation efficiencies. Resultsshowed that these cultivars differed significantly in their ability to acquire P from the sparingly available form(rock phosphate in this case). The accumulation of P by Brookton was three times that by Krichauff. Pconcentrations in plant tissues did not differ significantly, indicating that all cultivars were similar in Putilisation efficiency. A further experiment showed that the greater ability of a cultivar to take up P fromsparingly available form was related to the ability of a cultivar to acidify the rhizosphere. Seed P content wasa confounding factor in this system, and the use of relatively uniform seed with similar P content, preferablylow, was conducive to a successful outcome of the screening process.

关键词： phosphorus efficiency sand-culture uptake wheat genotypes

TiO_2在Al_2O_3表面上分散状态的AeM研究

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物理化学学报 1990年第4期6卷 474-479页

作者：魏昭彬辛勤 Sham e.l. Grange P. Delwon B. 中国科学院大连化学物理研究所比利时新鲁汶天主教大学

本文运用AeM方法考察了制备技术对TiO_2在Al_2O_3表面分散状态的影响.发现嫁接法可使TiO_2非常均匀地分散在Al_2O_3表面上,浸渍法也能得到较为均匀的TiO_2分布,而沉淀法所得到的TiO_2分散度较差.TiO_3只聚集在Al_20_3表面上的局部区域。

关键词：二氧化钛分散态 Al2O3表面 AeM

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牛虻

PHASeS　AND　STRUCTURe　OF　PReFORM　DURING　PRePARING　PROCeSS　OF　Al／TiCp　COMPOSITeS　BY　DIReCT　ReACTION　SYNTHeSIS

2018年

作者： e. l. Voynich[]

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Acta Metallurgica Sinica(english letters) 1996年第6期9卷 545-548页

作者： S. Y Zeng B. Yang and e.l. Zhang(Harbin Institute of Technology, Harbin 150001, China)M.Z. Ma(Jiamusi University, Jiamusi 154002, China ) Harbin Inst of Technology Harbin China

Direct reaction synthesis(DRS), based on the principle of self-propagating hightemperature synthesis (SHS), is a new method for preparing particulate metal matrix composites (PMMCs). The effects of the temperature of the aluminum melt and the aluminum content in the preform on the phases and structure of the reacted preform have been investigated by X-ray diffraction and scanning electron *** has been shown that TiC phase is prone to be synthesized with the increasing of the temperature of the aluminum melt and the decreasing of the aluminum powder content in the preform, and that the size of TiC particle becomes fine with the increasing of the temperature and the decreasing of the aluminum powder content.

关键词： direct reaction synthesis particulate composite Al/TiC