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2010年上半年,依托国家临时储备和竞价销售等宏观调控政策,国内玉米市场整体表现强势上涨。由于市场供求受国家宏观调控政策的影响较大,预计后期玉米价格将以稳为主,高位运行。国际方面,受美国玉米面积预增、美元汇率及国际原油价格波动等因素的共同影响,上半年国际玉米价格低位震荡。由于全球玉米供求关系有望缓解,预计后市国际玉米价格仍将持续低迷。 相似文献
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分析了近期国内玉米市场的供需状况、市场热羔以及价格走势。2006／07年度中国玉米市场供求关系偏紧，2007／08年度玉米需求趋向理性增长，玉米供求关系将延续紧平衡态势。2007年国内玉米价格进入南价区域，玉米价格上涨节奏可能打破2004～2006年的稳健态势，表现为波动幅度相对扩大，波动规律不好把握。2006年秋粮上市以来国内玉米价格呈现反季节上涨，而2007年1～3月份玉米价格处于调整期，预计4月份开始国内玉米价格有望进入季节上涨通道。 相似文献
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国内玉米供求关系偏紧，玉米需求增长速度仍然快于产量增长，导致国内需要适当进口玉米调整市场预期。2010年国内玉米价格大幅上涨，5月底东北产区玉米价格比2009年同期上涨300元／t，同比涨幅17％-25％，基本确定了本年度价格高点。6-7月国内玉米价格呈现先抑后扬．但是8-9月价格似乎已无悬念。预计2010年秋粮开秤价格将比2009年有较大提高，季节性的价格下跌行情可能不会出现。 相似文献
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受国家相对稳定的玉米临时储备政策支撑,2010年以来国内玉米市场整体表现比较强势,价格高位运行。但市场供求日趋依托国储抛售调节,预计后期玉米价格不会大起大落。国际方面,受美国玉米面积预增、美元汇率及国际原油价格上升等因素影响,玉米价格低位震荡,预计后期国际玉米价格将随着全球经济回暖震荡上行。 相似文献
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市场监测部预计,2004年我国玉米产量全面丰收,关内玉米大幅恢复增长,当前东北陈玉米供应充足。关内玉米上市后,玉米收购价格可能呈现迅速走低局势。当前市场价格正在处于重新定位,收购开秤价格水平将逐渐下移。理由在于:一是去年该地区玉米大幅减产,玉米质量也较差,而且玉米上市时间延迟。2004年东北黄淮地区玉米顺利上市,玉米丰收增产650万吨,玉米质量将明显高于上年。二是东北老粮价格将冲击新粮价格,当前该地区玉米价格定位较大程度上依据东北玉米价格,以长春玉米1150元/吨的较低车板价格计算,山东地区到货成本在1270元/吨。新玉米价格因… 相似文献
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引：63，自引：0，他引：63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites. 相似文献
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Mansfield E 《Science (New York, N.Y.)》1980,209(4461):1091-1093
R & D, through its effects on the rate of productivity increase, can significantly restrain the rate of inflation in the medium and long run. High rates of inflation damage the workings of the price system and impair the efficiency of practically all economic activities, including R & D. Findings suggest that the percentage increase between 1969 and 1979, in total real R & D expenditures, has been exaggerated due to the inadequacy of the gross national product deflator as applied to R & D. 相似文献
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Fiber, food, fuel, and fungal symbionts 总被引：2，自引：0，他引：2
Virtually all plants of economic importance form mycorrhizae. These absorbing organs of higher plants result from a symbiotic union of beneficial soil fungi and feeder roots. In forestry, the manipulation of fungal symbionts ecologically adapted to the planting site can increase survival and growth of forest trees, particularly on adverse sites. Vesicular-arbuscular mycorrhizae, which occur not only on many trees but also on most cultivated crops, are undoubtedly more important to world food crops. Imperatives for mycorrhizal research in forestry and agriculture are (i) the development of mass inoculum of mycorrhizal fungi, (ii) the interdisciplinary coordination with soil management, plant breeding, cultivation practices, and pest control to ensure maximum survival and development of fungal symbionts in the soil, and (iii) the institution of nursery and field tests to determine the circumstances in which mycorrhizae benefit plant growth in forestry and agri-ecosystems. 相似文献
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