以可区分度量为准则进行变形监测网的优化设计

本文采用变形模型可区分度量的概念进行监测网的优化设计。在算法上采用计算机模拟逐一更新的计算过程，为了克服常规模拟法需要人工干预的缺点，引进了一些规则，利用计算机的判断和推理过程，达到了自动设计的目的，作为示范例子，文中最后还给出了一个模拟监测网的设计结果。     

独头长巷分阶段通风的优化设计法

独头长巷通风能耗严重，采用分阶段通风设计方案可以减少能耗，降低费用。文中论述了分阶段通风方法及其节电原理、最优分段数和最优风筒直径的计算方法，并介绍了设计实例。     

对虾配合饵料科学配方的优化方法

本文讨论对虾配合饵料科学配方优化模型方法的建立及具体运用。 l 配方设计的数学模型 饵料配方设计的数学模型主要根据线性规划原理和方法建立,它研究的对象实际上是一个最优化问题,就是求某一目标函数在一定约束条件下的最小值(或最大值)。其数学特征是目标函数和约束条件均为线性函数,即约束条件和目标函数都可以用线性不等式组来表示。因此,线性规划的数学模型的标准形式在约束为:     

黄土高原小流域土地利用优化调控

At present, land use optimization at small watershed scale is the key measure to control soil erosion, restore the eco-environment and improve the farmers’ living standard on the Loess Plateau, China. Based on the land use survey maps of 1966, 1988, 1997, 2003 and the digital topographic map of 1984 in Yangou watershed, and assisted by spatial techniques of GIS, the basic characteristics and driving forces of land use change in Yangou watershed are analyzed. According to the summarization of land-use optimization characteristics since 1997, and with the help of continuous monitoring data for years and farmer investigation data, this paper appraises eco-environmental benefits, economic benefits and sustainability of Yangou watershed. We have used sediment reduction benefits, coverage ratio of permanent vegetation, per capita food production and per capita income of farmers as indices. The results show that Yangou watershed project has successfully controlled the soil and water loss and the farmers’ living standard has been improved markedly by reasonable adjustment to land use structure. The benefit of sediment reduction is higher than 80% and the coverage ratio of permanent vegetation reaches 61.03%. In 2006, the per capita income increased by 1493 yuan compared with the year 1998. The successful measures and experiences of Yangou watershed are worth promoting on the Loess Plateau.     

Global charm of the Changjiang River Delta

Based on the theory of geo-economy, under the new situation of global economy, information network and China‘s entry into WTO, also with the holding of APEC (in 2001) and the International Exposition in the near future, the Changjiang (Yangtze) River Delta is striding toward the spectacular international multi-polar situation and becomes one of core regions with high-speed development. Facing the ocean and world all along, leading the progressive tides of the age and scintillating the splendor of the nation, she does advance with time. Through a long period of irrigation projects construction and intensive operation of lands in previous agricultural society, the artificial wetland ecosystem with a positive cycle had ever been formed in this region. At present, environmental pollution and urban expansion resulted from post-industrialization are being rectified. The delta will be the paradigm of industrial and agricultural modernization along the sustainable development road. With the rapid development of urbanization,she has been one of the regions with the highest density population and high urbanization level. Taking the Changjiang River estuary and the Hangzhou Bay as two parts, she is continuously strengthening and adjusting her interior structure, expanding mothball space and constructing the oriental modem ″logistics center“ to link the whole world. The butterfly-style urban system of the Changjiang River Delta is flying, probably engendering earthshaking “butterfly effect“.     

新郑糖库夏季最佳通风时间分析与预报

利用新郑站１９９５、１９９６年６￣８月温度、相对湿度资料,确定了满足糖库温、湿度要求（温度〈３０℃、相对湿度〈７０％）的最佳通风时段。