大兴安岭地区樟子松人工林材积表的编制

利用 8 5 3株随机样木资料 ,编制了大兴安岭地区樟子松人工一元材积表和二元材积表 ,经检验材积表适用     

WTO与中国林业投资

中国加入WTO，将对林业投资产生较大的影响，既存在机遇，也面临挑战。外资的引进无疑也会发生一定的变化，同时也将进一步促进中国企业优势项目的再投资。     

ULTRASONOGRAPHIC DETERMINATION OF RENAL VOLUME IN THE DOG

Ultrasonographic linear and area measurements were performed on both kidneys of 15 clinically healthy dogs. Renal volumes were calculated from linear and area data applying three prolate ellipsoid models. Ultrasonographic volumes were then compared using linear regression analysis with kidney volumes measured in vitro by water displacement. In vivo ultrasonographic volumes had a statistically significant relationship with the in vitro volume. The highest correlation was provided by the single plane area method. There was also a correlation between body weight and ultrasonographically detected renal volume, suggesting that ultrasound imaging may be a useful method for assessment of renal volume changes in dogs with renal disease.     

一种可以处理离乱数据的交通量预测模型

未来交通量是道路交通规划与建设中十分重要的技术指标，是确定道路等级、道路断面、结构形式和标准不可缺少的条件。本文采用的交通量预测灰色系统模型GM（1，1），可有效处理贫信息和离乱数据，有较高的预测精度，在交通量预测中有很高的应用价值。     

森林采伐与造林对土壤水分物理性质的影响

采用对比实验的方法．对小兴安岭林区主要森林类型采伐后土壤水分物理性盾进行了测定和研究．结果表明：森林采伐后土壤容重增大孔隙度减小．土壤持水性能降低。其中．皆伐比释伐对土壤的影响太．且集材道土壤的破坏也最大。采伐后选择适当树种及时人工造林．有利于土壤的保护和改善．采伐迹地的撩荒则使土壤破坏加剧．     

出油阀腔容积对JC375柴油机性能影响的研究

出油阀腔容积在高压系统中占有相当比例，其影响不可忽视。就出油阀腔容积对JC375柴油机性能进行了测试，绘制了相关曲线，并分析了出油阀腔容积对柴油机性能的影响。     

Resistance,redistribution, and power in the Fair Trade banana initiative

The Fair Trade movement seeks to alter conventional trade relations through a system of social and environmental standards, certification, and labels designed to help shorten the social distance between consumers in the North and producers in the South. The strategy is based on working both in and against the same global capitalist market that it hopes to alter, raising questions about if and how Fair Trade initiatives exhibit counter-hegemonic potential to transform the conventional agro-food system. This paper considers the multiple levels at which Fair Trade alternatives operate to identify the different forms of social action that the movement engages with, and to clarify where the movements counter-hegemonic potentials are being realized. I suggest the Fair Trade movement is most successful in encouraging consumers and producers to commit acts of resistance and in supporting redistributive action that shifts resources from North to South. Up to now, however, Fair Trade alternatives appear to hold only a theoretical potential to provoke transformative change in the agro-food system. A reconceptualization of the Fair Trade model and how it is implemented could allow it to manifest more of its implicit, oppositional promise.Aimee Shreckis a sociologist and the Research Specialist for the California Faculty Association. Her previous work as a postdoctoral researcher with the University of California, Berkeley and the Sustainable Agriculture Research and Education Program focused on social justice, sustainable agriculture, and fair trade.     

温度和压力对原油动态计量标准体积的影响

一般大型油田原油外销计量具有连续运行、动态计量、数量大、精度高的特点.在密闭压力管道中,计量温度和压力直接影响原油标准体积的计算结果,进而影响纯油量结算,事关原油交接双方的经济利益,尤其在大型原油交接点,由于交接量较大,更应引起足够的重视.     

HPLC柱子换向使用的效率分析

本文探讨了柱压、重现性这二个重要因素与柱效之间的关系。采用柱的“换向法”,降低了柱的一般性堵塞和渗漏问题,明显地延长了柱的使用寿命。