小波分析与光谱学信号处理

本文从小波变换的概念及其应用的基本原理出发，就其在光谱学方面的应用概括为红外光谱、紫外-可见光谱、核磁共振光谱、质谱四个方面的应用作了简要评述。     

廊坊城市绿地景观生态规划探讨

以城市绿地系统生态规划理论为指导,根据廊坊城市的人口密度、经济条件和绿化现状对廊坊城市绿地从公园体系、绿地廊道、和楔形绿地3个方面进行了绿地生态规划,使廊坊城市形成“三楔三环十带十园”的绿地布局形态,为廊坊城市绿地系统规划的修订提供科学依据.     

发展农业科技企业的思考

农业科技企业在农业科技体制改革中诞生,在科技体制改革深化中发展。创建农业科技企业的目的是为了促进科技成果转化为生产力,促进科技与经济有效结合,也是农业科研单位自身改革发展的客观要求。文章探讨了当前农业科技企业发展的现状与存在的问题,强调必须加强技术创新,逐步将农业科技企业培育成为技术创新与产业创新的主体。     

云南高山林区灭火战法研究

云南地形复杂,高山林立,气候差异较大,一旦发生森林火灾,灭火人员难以接近,扑救难度大,危险性高。武警森林部队作为灭火主力军,在长期的灭火作战实践中总结出了一些较为实用的灭火战法:一点突破,两翼推进;两翼对进,钳形夹击;多点突破,分割围歼;全线封控,重点打击;穿插迂回,递进超越;利用依托,以火攻火;预设隔离,阻歼林火;地空配合,立体灭火。对每种战法的含义、运用时机及把握重点作了介绍。     

作物定位轮作体系长期试验研究(Ⅲ)--轮作与连作对土壤微生物数量的影响

1997～2002年在东北农业大学校内农学试验田进行了作物定位轮作的长期试验研究,1997年对土壤微生物数量进行了测定,以探讨轮作与连作对土壤微生物数量的影响。研究表明,土壤细菌和放线菌在前期数量较低,在生育盛期和成熟期较高,土壤真菌数量在前期呈现较高的水平,后期数量反而较低;大豆对各类土壤微生物的繁衍均有一定的促进作用,这种促进作用在作物生育中后期才有表现;玉米连作使土壤微生物数量略有减少;小麦连作更有利于土壤微生物的繁衍。大豆田土壤微生物的数量变化与大豆生长发育状况相关性不明显。     

新疆喀纳斯图瓦部落文化的开发策略

民族文化游在新疆旅游业发展中占据着重要的位置。本文通过对图瓦部落文化旅游资源的构成 ,开发现状等的分析 ,提出了对图瓦部落文化的开发策略 ,其中包括保持原有的民族特色 ,努力提高知名度 ,创新开发观念 ,开发与保护并重等方面。此外 ,在开发中将图瓦部落文化与喀纳斯风光相结合 ,营造更具人文特色的喀纳斯旅游景区 ,以此达到对图瓦部落文化保护的长远目标。     

Cacao-fruit tree intercropping effects on cocoa yield, plant vigour and light interception in Côte d’Ivoire

A major challenge for cocoa producers in Côte d’Ivoire is to seek alternative shade trees or crop associations to adapt their planting devices and techniques to the shortage of forests. The recent tendency developed by farmers is to plant simplified orchards combining cacao and fruit trees. An on-farm trial was set up in a 5-year-old cocoa farm to compare a cacao monocrop planted at densities of 1,115 trees ha^?1 with cacao intercropped with orange or avocado trees, both at 44 trees ha^?1. Observations were done on incident light received by the cacao, vigour, growth and cocoa yields. On average, the cacaos received 100 % light in the monocrop, 89.6 % under orange trees and 80.6 % of incident light under avocado trees. They yielded 64.0 pods tree^?1 year^?1 in the monocrop (equivalent to 2.54 kg dry cocoa beans tree^?1), 30.3 pods tree^?1 when combined with orange trees and 28.3 pods tree^?1 with avocado trees. The two combinations allowed cocoa yields equivalent to those observed in the region (0.58 kg dry cocoa beans tree^?1). Vigour and yield were very highly correlated with the incident light received. Both the yield and the incident light are a logistic function of the planting distance from the shade tree. The inflexion point of the logistic functions corresponds to the minimum planting distance between the cacao and the intercropped fruit trees. On this basis, we suggest that the cacaos should not be planted closer than 6.50 ± 0.2 m to the orange or avocado trees.     

Dyeing behavior of laser-treated polyester

Polyester fabric was pre-treated with laser, followed by dyeing. The experimental results revealed that the rate of dyeing was greatly increased but the final percentage of dye exhaustion at equilibrium did not show any significant change. Based on the thermodynamic parameter of dyeing, it was concluded that laser treatment could provide the possibility of developing a low temperature dyeing process. Morphological and thermal studies revealed that obvious surface structure changes occurred. In the morphological analysis, ripple-like structure was found after laser treatment. This ripple-like structure may have captured more dye particles which could improve the dyeing behavior of polyester fibre. On the other hand, thermal analysis result revealed that the surface of polyester becomes highly amorphous on laser treatment, due to ablation. Meanwhile, XPS analysis showed that hydrophilic functional groups were introduced on to the laser-treated polyester fibre surface. As a result, surface physical and chemical changes induced by laser affect the dyeing behavior of polyester fibre. However, the laser treatment could not impart any adverse effect on color fastness to crocking and washing.     

基于水系生态保护的林业调查规划研究

以水系林业生态保护为目标,采用问题研究与目标导向相结合、规划研究与实施应用相结合的技术路线,全面调查分析了沂蒙山区水系分布状况及林业资源现状,进行了以水系林业生态保护为目的林业生态建设区域和类型划分,开展了重点区位水系林业生态保护专项研究与专项规划设计。     

The reasonable scale of water reuse system in irrigation area: a case study of Chitong irrigation district in Taiwan

The aim of this study is to assess the potential of the irrigation return-flow in a water reuse system, for the supply of other local water users. Both field survey and water-budget analysis were conducted, and the Chitong irrigation district in Taiwan was selected as the case study area. The results indicate that through the regulation of a pond with the effective capacity of 20,000 m³, a stable supply of 10,000 CMD of reuse water can be generated if the return-flow from the irrigation area of 200 hectares, which is about the size of a rotation plot, is intercepted. However, as the irrigation and effective rainfall are low from December to March, which are considered high risk for water supply, the irrigation return-flow decreases accordingly, and a series of responding measures are also suggested.