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木制品坯料出材率的影响因素分析
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作者 姜新波 李珂 姜博文 《科学技术与工程》 北大核心 2022年第25期10930-10938,共9页
中国木材供应长期存在较大缺口,为缓解木材供需矛盾,提升木制品坯料出材率,以松木锯材为研究对象,现场测定其尺寸规格及缺陷状况,建立锯材登记表。根据实测数据,设计回归试验方案,完成锯材的模拟下锯实验。对模拟下锯实验结果进行回归试... 中国木材供应长期存在较大缺口,为缓解木材供需矛盾,提升木制品坯料出材率,以松木锯材为研究对象,现场测定其尺寸规格及缺陷状况,建立锯材登记表。根据实测数据,设计回归试验方案,完成锯材的模拟下锯实验。对模拟下锯实验结果进行回归试验,建立各影响因素对基本坯料体积出材率系数和短坯料体积出材率系数的回归方程,分析并确定各影响因素对各输出指标的影响规律。结果表明,锯材质量和对坯料质量的要求是影响木制品坯料出材率的最主要因素,随着锯材质量的提高和对坯料质量的要求降低,总的坯料体积出材率提升超过12%。提出了利用锯材表面缺陷的相对面积来划分锯材等级的新思路,并建立了锯材等级与优质坯料生产工艺之间的对应关系,为优化下锯关键设备研发提供了基础理论支撑。 展开更多
关键词 木制品坯料 松木锯材 模拟下锯 出材率 锯材等级
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Economic Feasibility of Simultaneous Production of Pine Sawlogs and Meat Goats on Small-Sized Farms in Alabama
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作者 Brandi Broughton James O. Bukenya Ermson Nyakatawa 《Journal of Life Sciences》 2012年第1期80-90,共11页
The objective of this study were to conduct economic evaluations of silvopasture farming system to enable landowners, extension personnel, and other decision makers to correctly assess its potential among the many lan... The objective of this study were to conduct economic evaluations of silvopasture farming system to enable landowners, extension personnel, and other decision makers to correctly assess its potential among the many land-use options; and to determine the most profitable animal stocking rate on small farms in Alabama. The analysis draws on data from a silvopastoral experiment conducted in the Alabama Black Belt region, on the property of the Federation of Southern Cooperatives in Epes, Alabama, between June 2006 and July 2010. Economic and financial ratio analyses were used to compare profitability, management feasibility, and risk considerations of simultaneous production of pine sawlogs and meat goats on small-sized farms in Alabama. The results suggest that silvopasture technology is profitable and financially feasible under specified assumptions. The Net Present Value model suggested that investing in silvopasture system would be considered acceptable at the 6 percent discount rate at a high stocking rate of 8 meat goats per acre. These findings were reaffirmed by the financial feasibility analysis. 展开更多
关键词 Economic feasibility SILVOPASTURE meat goats pine sawlogs net present value.
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