毛竹林长期立地生产力评价和预测研究的评述

本文论述了我国毛竹林长期立地生产力评价和预测研究的背景、特点、面临的主要技术难点、可供利用的优势以及可能的研究策略和解决途径，为探索毛竹林在不同经营措施作用下长期立地生产力的评价和预测的理论及方法提供参考。     

输气管道失效风险预测计算方法探讨

介绍了一种基于可拓工程的计算方法,计算出该管道检测“点”的状态(或“点集合”的状态)与“设计状态-材料性能”数据区间(或区间套)的位值及关联程度,即“状态点”关于区间或区间套的关联函数,用于分析、生成是否需要配置维修资源、何时配置等决策信息。     

人口预测模型在乡镇土地规划修编中的应用研究——以梧州市长洲镇为例

对乡镇规划修编中几种常用人口预测模型的特点和适用条件进行实证分析和比较分析，并提出相应的建议，最后对人口预测模型在未来土地规划修编中的前景进行展望。     

出版发行变化影响下的期刊采访工作

通过分析期刊市场的种种变化,针对期刊出版发行的变化对期刊采访工作的影响提出了图书馆期刊采访工作的对策。     

基于生命周期的开发区土地利用集约度预测

以土地开发的生命周期特征为切入点,通过数据叠加增加数据的时间序列,借助逻辑生长曲线对建筑密度进行预测,进而测算开发区土地利用集约度,建立了一套有效的开发区土地利用集约度预测方法.结果表明,预测结果较符合实际情况,开发区土地利用集约度增长速度呈逐渐减小的变化趋势,区龄为12 a时达到饱和值,然后呈下降或稳定的趋势.     

Area-to-Point Kriging of Soil Phosphorus Composite Samples

Mapping of phosphorus (P) is based on sampling and laboratory analysis. Although laboratory analysis is costly, the number of samples is restricted in practice. In zone sampling, areas of the field are used to composite samples from sets of sampling points to reduce efforts. This study introduces area-to-point (ATP) kriging for downscaling composite samples with different sizes and shapes of the sampling areas. ATP kriging makes use of the coordinates of the sampling points of the composite samples. The applicability was tested on a simulated data set as well as on a spatially dense sample set of P measurements. Validation shows that ATP kriging outperforms point kriging with centroid interpolation. The root mean square error (RMSE) is reduced from 39.5 to 33.5 mg kg^?1. ATP kriging predictions were better at retaining the P value of the sampling area. The smoothing effect of interpolation and the aggregation effect of compositing the samples were reduced.     

基于时间序列的大型灌区日退水量预测模型研究

采用时序图和自相关图相结合的方法,对大型灌区的日退水量时间序列进行了分析,建立了灌区日退水量时间序列ARIMA模型,并以宁夏青铜峡灌区为例进行了实证研究,取得了较为精确的结果,为灌区退水量的准确预测提供了理论依据。     

The use of computer-generated electrostatic surface maps for the design of new ‘GABA-ergic’ insecticides

A computer model was constructed based on the observation that a number of structurally dissimilar compounds gave rise to similar biological activity. Mode of action work confirmed the link. The model was then used to prioritise targets for synthesis and successfully predicted many active series. The major limitation of the model was that it was unable to predict potency or spectrum. It is thought likely that the factors controlling these limitations are linked with LUMO energies, but this hypothesis has not been proven.     

宁夏地区春小麦黄矮病流行趋势预测的初步研究

通过23年(1970—1993)的研究,初步明确了东南方冬麦区黄矮病情、春麦区拔节初期麦二叉蚜量和东南方冬麦区麦蚜迁出迟早等是影响宁夏春麦区黄矮病流行的关键因素,黄矮病历年流行程度与春小麦生长期间的主要气象因子相关不密切。针对麦蚜远距离迁飞所致春麦黄矮病,首次提出了以2个预测式为基础的黄矮病流行趋势预测办法,并据此进行了多次成功的预报。     

烘烤干筋阶段恒定温度及持续时间对烤烟香吃味的影响

试验采用二因素回归最优设计,研究了贵烟4号烘烤干筋恒定温度及持续时间对烤后烟叶香吃味评分及石油醚提取物含量的影响。结果表明:在干筋阶段当温度稳定在50℃-60℃持续时间5-20h时,烟叶香吃味评分和石油醚提取物含量表现出先增后降的抛物线曲线,最佳香吃味得分出现在温度54.3℃-57.0℃,持续时间为12.5-15.5h:最高石油醚提取物含量出现在温度54.3℃-56.3℃、持续时间5-12.5h时,二者具有较好的相关性。