Object‐Based Mapping of Karst Rocky Desertification using a Support Vector Machine

Accurate and cost‐effective mapping of karst rocky desertification (KRD) is still a challenge at the regional and national scale. Visual interpretation has been utilised in the majority of studies, while an automated method based on pixel data has been investigated repeatedly. An object‐based method coupling with support vector machine (SVM) was developed and tested using Enhanced Thematic Mapper Plus (ETM+) images from three selected counties (Liujiang, Changshun and Zhenyuan) with different karst landscapes in SW China. The method supports a strategy of defining a mapping unit. It combined ETM+ images and ancillary data including elevation, slope and Normalized Difference Vegetation Index images. A sequence of scale parameters estimation, image segmentation, training data sampling, SVM parameters tuning and object classification was performed to achieve the mapping. A quantitative and semi‐automated approach was used to estimate scale parameters for segmenting an object at an optimal scale. We calculated the sum of area‐weighted standard deviation (WS), rate of change for WS, local variance (LV) and rate of change for LV at each scale level, and the threshold of the aforementioned index that indicated the optimal segment level and merge level. The KRD classification results had overall accuracies of 85·50, 84·00 and 84·86 per cent for Liujiang, Changshun and Zhenyuan, respectively, and kappa coefficients are up to 0·8062, 0·7917 and 0·8083, respectively. This approach mapped six classes of KRD and offered a visually appealing presentation. Moreover, it proposed a conceptual and size‐variable object from the classification standard of KRD. The results demonstrate that the application of our method provides an efficient approach for the mapping of KRD. Copyright © 2012 John Wiley & Sons, Ltd.     

The effects of transportation stress on Japanese quail (Coturnix Coturnix japonica) fed corn‐based diet in comparison with wheat‐based diet supplemented with xylanase and phytase

Harvesting, handling and transporting quails to the slaughterhouses, other farms and laboratories might covertly reduce their welfare. The aim of this study was to evaluate the effects of two major sources of energy in poultry nutrition on reducing transportation stress in Japanese quail (Coturnix Coturnix japonica). Male quails (n = 60) were divided into two groups. The first group was fed corn‐based diet, and the second was fed wheat‐based diet supplemented with xylanase and phytase. At the end of the experiment (day 35), quails were subjected to 80 km of transportation. Immediately on arrival and after 24 h, heterophil counts, lymphocyte counts and H:L ratios were measured. On arrival, H counts were lower, L counts were higher, and H:L ratios were lower for corn‐fed group. After 24 h, wheat‐fed group showed lower increment of H counts, greater increment of L counts and also decrement of H:L ratios rather than corn‐fed group which showed increment of H:L ratios. However, these ratios were still lower in corn‐fed group. Results indicate that corn‐based diets can help Japanese quail to better resist transportation stress, although it seems that feeding wheat‐based diets supplemented with xylanase and phytase could have positive effects for coping better with stress after journeys.     

《人造板工艺学》网络课件的制作

结合《人造板工艺学》网络课件的实际制作过程，参考相关的现代教育技术发展动态，依据木材科学与工程专业的学科特色，在将计算机与木材加工两学科进行整合方面。进行了扎实的工作。     

Research on Cooperative Design Network Security Based on IP-VPN

As the important method and instrument of agile manufacture,the technology of distributed collaborative design and manufacturing has become the hotspot of manufacturing. The basic concept and key technologies of IP_VPN are introduced in this paper,and a collaborative design network model based on IP_VPN is presented. Distributed collaborative design is a multi_user,multitask involved system, which is consisted of lots of collaborative processs,so the network security is the key of distributed collaborative design. We research on the security of collaborative design network based on IP_VPN, hence get a conclusion:we can construct an economical?practical and secure collaborative design network system by the application of data encryption,user authentication and access control based on the role,etc.     

A MATHEMATICAL MODEL OF FUZZY EVALUATION METHOD FOR ENVIRONMENTAL POLLUTION

The problem of fuzzy evaluation of environmental pollution is importantboth in environment science and in environmental protection.Usual evaluationmethods have their own characteristics.This paper puts forward a mathematicalmodel of fuzzy evaluation method in grades by means of systematic analysisfor environmental pollution.At the same time,it assigns weighted values byordering based on paired comparison.     

甘肃能源型生态农业推广效益分析

本文就近年来甘肃以沼气为纽带的能源型生态农业模式的推广情况及其所带来的社会、经济和生态效益做一简要分析.     

沿渡河流域分布式水文模型的构建

按照综合分布式概念性水文模型和分布式水文物理模型长处的建模思路，应用改进的格林-安普特下渗理论和地貌水文学的水滴运动理论，建立了一个具有物理基础的松散结构分布式流域水文模型。模型的产流方法融合了邓恩产流理论和霍顿超渗产流理论，考虑土壤水分剖面、土壤各向异性和地形坡度等对流域产流的影响；模型的汇流方法利用地貌水文学理论，寻求水文过程与流域地形地貌的相互作用及定量关系，以确定模型参数，其优势在于可以考虑净雨空间分布不均和流速空间分不均对流域汇流的影响问题。以湿润地区典型流域沿渡河为对象进行水文模拟应用研究，结果良好,说明模型较为可靠。     

聚氨酯木材胶粘剂的研究(Ⅰ)--化学组成对粘接力学性能的影响

以多亚甲基多苯基多异氰酸酯（PAPI）和聚醚多元醇为原料合成了一种单组分、室温湿固化的端异氰酸酯聚氨酯胶粘剂。本研究考察了物料的化学组成对胶粘剂粘接木材的力学性能产生的影响。实验表明,与改性二苯基二异氰酸酯（MDI）相比,PAPI合成的胶粘剂对木材粘接干压剪强度提高了60％;将相对分子质量（Mw）为800、1000和2000的聚氧化乙烯二醇（PED）、Mw为300和3000的聚氧化丙烯三醇（N303和N330）以及聚四氢呋喃一氧化丙烯二醇（NG220）按优化的比例复合使用,以改性胺和有机锡复合催化,可有效提高粘接木材的干和湿压剪强度、固化速率以及木破率。Fr-IR光谱证实聚醚多元醇的-OH与PAPI的-NCO反应生成了氨基甲酸酯（-NHCOO-）,但N—H和G=O均以氢键形式存在。