An Adjustable Nutrient Margin of Safety Comparison Using Linear and Stochastic Programming in an Excel Spreadsheet

A stochastic-linear program Excel workbook was developed that consisted of 2 worksheets illustrating linear and stochastic program approaches. Both approaches used the Excel Solver add-in. A published linear program problem served as an example for the ingredients, nutrients, and costs and as a benchmark in the development of the linear and stochastic programs. Standard deviations for ME and nutrients were taken or calculated from CV, and from a commercial publication of sources for amino acids. The Excel spreadsheet was set up so that the calculated margin of safety (MOS) value, according to the requested probability, was the same for both the linear and stochastic programs. As an example, the probability for meeting the nutrient value for protein was compared at 50% (MOS = 0) and 69% (MOS = 0.5) by using both linear and stochastic programming. Spreadsheet results illustrated the flexibility, accuracy, and precision of the stochastic program over the linear program in meeting the requested nutrient probability.     

Information and Training Needs of Non-Timber Forest Products' Operators in Southern Nigeria

Abstract

This study examined the training needs of non-timber forest products' (NTFP) operators in Southern Nigeria. One hundred-fifty forest operators in Ondo State, Nigeria were sampled using structured questionnaire. Data collected was analyzed using percentages, mean, Chi-square test, and Pearson Product Moment Correlation. The results revealed that majority of the forest operators in Southern Nigeria are middle-aged women with low level of education. The need for training is high and significant (P < 0.05), and there is a positive relationship between training/ information received and the operators's productivity.     

森林采伐限额与林业企业生产经营优化的探讨

简述了实施森林采伐限额制度的意义，以及实施限量采伐对林业企业经济的影响。利用投入产出与线性规划最优化模型对林业企业生产经营进行优化设计，提出了解决林业企业民限量采伐矛盾的方法和途径。     

木香花挥发性组分的定量结构-色谱保留关系研究

采用分子电性距离矢量(MEDV)表征了木香花挥发性成分的分子结构,建立了色谱定量结构-保留关系(QSRR)模型,同时运用多元线性回归/逐步回归对模型进行变量筛选,建立了53种木香花挥发性成分气相色谱保留时间(tR)与MEDV的定量相关10 变量、 6变量模型及线性保留指数(ILR)的10、7、6变量模型.QSRR模型的建模计算值复相关系数(R)分别为0.949、0.906、0.906、0.949和0.943.留一法交互校验复相关系数(RCV)分别为0.867、0.904、0.905、0.901和0.904.结果表明所建模型具有良好估计能力与稳定性.     

最佳线性无偏预测估计种畜育种值（BLUP）可视化计算机程序

应用VB6可视化编程软件，设计较先进的最佳线性无偏预测估计种畜育种值（BLUP法）程序，增强了软件的功能，使其更具易用性、广泛性。     

Prediction of watermelon quality based on vibration spectrum

Judging watermelon quality based on its apparent properties such as size or skin color is difficult. A non-destructive method is employed here, based on vibrational response spectrum, to determine the quality indices of watermelon (Charleston gray). The responses of samples to vibration excitation were recorded by laser Doppler vibrometry (LDV). The phase shift between input and output signals were extracted over a wide frequency range. The total soluble solids (TSS), titratable acidity (TA) and TSS/TA ratio also measured as watermelon quality characters. Stepwise multiple linear regression (SMLR) as well as partial least square regression (PLS) was applied to extracted vibration spectrums to construct prediction models of watermelon quality. The results showed that performance of SMLR models were better than PLS. The determination coefficients (R²) of SMLR validation models were 0.9976, 0.9985 and 0.9542 for TSS, TA and TSS/TA respectively. It is likely that reduction of cell wall materials to soluble solids during ripening process changes viscoelastic properties of watermelon reflected by vibrational response. This study demonstrated the feasibility of mentioned method for predicting the quality of watermelons in an industrial grading system.     

基于0．18um CMOS工艺线性调整器设计

本设计采用0．18umCMOS工艺实现液晶显示器（LCD）控制芯片中的基准源电路，设计增加一级线性调整器电路，将带隙基准电路产生的1．2V左右的带隙电压调整为与数字核心电路所要求的电源电压1．8V的输出电压。通过元器件模型参数的电路仿真，性能指标基本达到要求。     

北京八达岭人工油松林地表枯死可燃物负荷量研究

地表枯死可燃物负荷量多少是森林火灾发生的基础。调查八达岭林场不同地形条件下油松林地表枯死可燃物和林分因子,取得42块样地资料;用线性相关分析法对各因子与地表枯死可燃物负荷量进行分析,平均树高、坡度和海拔与对应负荷量有显著线性关系;应用多元线性回归中的逐步回归剔除法,建立了估测模型,除平均胸径外,平均树高、密度、郁闭度、海拔、坡度被引入,经检验回归显著,该估测模型可用于其它油松林地表可燃物负荷量估测。     

曲线回归计算器程序编制

利用ＣＡＳＩＯｆｘ－４５００ｐ计算器编程对一套数据同时用农林业常用的８个经验方程进行曲线回归，并进行显著性检验，选出最佳方程。     

北京九龙山油松人工林地位指数表的编制及油松林生长与立地因子的关系

北京地处暖温带半湿润季风气候区，地带性植被是暖温带落叶阔叶林。由于长期受