强化木地板耐磨性能及国产化耐磨纸的研究

对强化木地板的耐磨性能和国产化耐磨纸进行了研究,重点考察耐磨纸的生产方式和热压工艺过程对产品耐磨转数和磨耗量的影响。结果表明Al2O3添加量和添加方式对产品的耐磨性能有很大影响,新研制的B型耐磨纸和进口耐磨纸有相似的磨损曲线,其耐磨转数与Al2O3添加量之间呈线性正相关,耐磨转数的增加主要表现在延长第二磨损区域,即提高初始磨损的IP值。热压工艺过程与产品的耐磨性能之间无明确关系。     

我国独立董事制度存在的问题及对策思考

独立董事制度对完善上市公司法人治理结构有着十分重要的作用。但我国独立董事制度自建立以来所发挥的作用却十分有限。本文系统分析目前中国上市公司独立董事制度存在的问题，提出完善独立董事制度的对策思考。认为，独立董事制度能否在我国建立并真正发挥作用，关键在于要有完善的法律体系予以规范，良好的公司治理文化予以配合，否则，独立董事制度只会成为大股东控制公司的遮羞布。     

不同肥料用量组合对烤烟产值的效应

选择氦、钾、饼肥作为决策变量，研究其对烤烟产值的影响。采用三因素水平二次回归通用旋转组合设计，获得了3个决策变量（Xi）与目标函数（Ya)相互关系的数学模型。分析其试验因素效应和交互作用，并通过计算机模拟寻优，优选出最佳施肥方案，即纯氮施用量为62.26-75.43kg/hm^2，纯钾施用量为191.91-222.02kg/hm^2，饼肥施用量为77.85-115.98kg/hm^2。     

证明微分中值定理时构造辅助函数的问题

本文力图通过微分中值定理证明过程中引入辅助函数的几何构思的辨析，帮助读者理解和认识微分中值定理。     

农民人口密度对实现全面小康压力的数量比较

用 2 0 0 3年江苏省及徐州农业经济发展的统计资料分析当地农民人口密度对小康压力的数值 ,根据其压力值的对比可以使决策部门寻找最佳人口调控的决策。     

华南早晚造籼稻品质变化规律与定级探讨

应用国家优质稻谷标准GB／T17891-1999对华南籼稻早晚两造种植的稻谷样品进行了品质指标系统测定，结果表明：不同品种(组合)早晚造品质变化具有特异性。     

不同储粮区域的储备粮仓仓型优化分析

本文通过综合考虑使用功能和成本对我国7个不同储粮区域的主要仓型进行了价格分析和定量分析。     

提高农作物秸秆饲用价值的有效方法

在生产实践中采用青贮、氨化、热喷、酵母菌发酵和人工瘤胃发酵的方法处理农作物秸秆,将大大提高其饲用价值。     

影响脲醛树脂胶粘剂性能的因素分析

对影响脲醛树脂胶粘剂质量的主要因素如摩尔比，pH值，反应温度，反应时间及原料质量等进行了分析，评价并提出最佳控制参数。     

Estimate of reproductive value of the big eye Priacanthus macracanthus in the north-eastern waters off Taiwan

ABSTRACT: The reproductive value and population status of the big eye in the north-eastern Taiwan waters was estimated by demographic analysis using available life-history parameters. Life-history tables were constructed using estimates of natural mortality ( M ) of 10.4920/year for age 0 and 0.3256/year for ages 1–9, with a maximum age of 9. Age-specific batch fecundity ( F_e ) was from F_e  = 1391.34e^{0.1782 FL} . The age-specific proportion of maturity was estimated from the relationship between the proportion of female maturity ( Pr ) and fork length ( FL ): Pr  = 1/(1 + e^{15.081−0.796 FL} ). Females mature at age 3 and mature females reproduce every year. The population increase rate (λ) was estimated to be 20.5% per year and the generation time ( G ) was 6.25 years without exploitation. The net reproductive value ( R₀ ), generation time and intrinsic rate of natural increase ( r ) decreased with increased fishing mortality. For fixed fishing mortality, when F  = 1.2/year and fishing started at age 3, R₀ was estimated to be 1.0 and the population was considered to be in equilibrium. For age-specific fishing mortality, when fishing started at age 3, R₀ was estimated to be 0.96/year, G being 6.18 years, and the population decreased 0.7% per year. The big eye population had a strong resilience as long as F  < = 1.3/year started at an age that was older than the age at maturity (i.e. 3 years old) but would decline when intensive fishing ( F  > = 1.2/year) started at age 2 or younger. Sensitivity analysis indicated that the mortality of age 0 is the most sensitive parameter in demographic analysis.