Opelug-ontspanning op Boseiendomme

Insect-induced damage to leaves, and the growth phenology, of Olea europaea subsp. africana and Kiggelaria africana near Stellenbosch (33° 56'S, 18° 52'E) were monitored at weekly intervals between July 1980 and June 1981. The average incidence of damaged leaves was greater in K. africana than in O.e. africana (14 vs 10 %, respectively). In both species, leaf-damage appeared to be slightly more than twice as great in January-June than in July-December, and insect attacks on leaves apparently began to intensify after the plants had completed their main growth and production of new leaves in the austral spring. These findings are discussed in relation to the meagre published information on herbivory in the fynbos biome.     

ZFS4800型液压支架的结构分析与强度计算

液压支架是煤炭工业中最主要的支护设备,为工人安全生产和设备的正常工作提供了保证.介绍了液压支架的工作原理,并使用Solid-edge软件对液压支架进行三维建模,完成了对液压支架的虚拟装配.通过对ZFS4800型液压支架的结构简化和分析,建立了液压支架的强度计算过程,结果表明其性能可靠.     

台湾中部地区短延时降雨强度初步探讨

台湾地区在经历1999年的921地震后,山坡地土体松动严重,仅仅短延时的降雨即有机会引起土石流的发生,而近年微小的降雨条件下即有可能触动土石流发生,因此将台湾中部地区14个测站所测得的台风降雨资料,依照台风降雨强度进行水文频率分析,分析方法采用对数常态分布法、极端值第一类分布法、皮尔逊第三类分布法及对数皮尔逊第三类分布法等4种方法,计算短延时重现期距并绘成降雨强度-延时-频率之分析曲线,再整合各区域土石流潜势溪流的分布情况,分析台风降雨对台湾中部地区所造成之影响.     

伊川县创建国家级园林县城的可行性分析

指出了在"十二五"时期,伊川将创建国家级园林县城,结合此创建指标,探讨了从综合治理、绿地建设、建设管控、生态环境、节能减排等方面的体制保障和技术创新,阐明了创建国家级园林县城的可行性。     

我国发展现代风险导向审计的对策与建议

本文研究了现代风险导向审计在我国的运用前景,分析了依托我国最新的审计风险准则,发展现代风险导向审计的方法,提出了在我国推行现代风险导向审计的几条政策建议。     

运用形态特征和分支、表征方法探讨广义花楸属( Sorbus L. ) 属下分类关系

 选取了广义花楸属(Sorbus L. ) 属下6个亚属的34种植物作为研究对象, 并以Pyrus, Crataegus, Photinia, Malus和Cotoneaster作为外类群, 对其典型的30个形态性状数据进行编码, 采用分支分析和表征分析的方法研究花楸属属下类群的分类关系。结果表明, 广义花楸属是一个非单系类群, 外类群完全镶嵌于其中; 属下的6个亚属各自不能形成单系, 只有花楸亚属( Subgenus Sorbus) 形成不严格的单系。作者初步认为, 花楸属应该仅包含复叶类群( Subgenus Sorbus) , 或者还会有Subgenus Cormus。由于其余的4个亚属尚不能形成规则的单系或聚类, 故进一步的研究宜采用分类群的更多性状或运用分子系统学的途径。     

AN APPLICATION OF IMAGE PROCESSING TECHNIQUES IN COMPUTED TOMOGRAPHY IMAGE ANALYSIS

An estimate of the thickness of subcutaneous adipose tissue at differing positions around the body was required in a study examining body composition. To eliminate human error associated with the manual placement of markers for measurements and to facilitate the collection of data from a large number of animals and image slices, automation of the process was desirable. The open-source and free image analysis program ImageJ was used. A macro procedure was created that provided the required functionality. The macro performs a number of basic image processing procedures. These include an initial process designed to remove the scanning table from the image and to center the animal in the image. This is followed by placement of a vertical line segment from the mid point of the upper border of the image to the image center. Measurements are made between automatically detected outer and inner boundaries of subcutaneous adipose tissue along this line segment. This process was repeated as the image was rotated (with the line position remaining unchanged) so that measurements around the complete circumference were obtained. Additionally, an image was created showing all detected boundary points so that sites of measurement could be checked by visual inspection. This paper provides a detailed account of this macro, illustrates the effect of its components on the image, and the applicability of standard image processing techniques to veterinary imaging.     

The whole amino acid profile as indicator of the nutritional condition in cultured marine fish larvae

The effect of variations in the amount or quality of food provided on the amino acid profile of larvae, was tested in two marine fish species, the Senegal sole (Solea senegalensis) and the sea bass (Dicentrarchus labrax). The objective was to assess whether such nutritionally suboptimum dietary patterns, which simulate situations that may occur in hatcheries, result in variations in the concentration of one or more amino acids that could be used as indicators of nutritional condition of larvae. Restriction in the normal food ration by 60% had no clear effect on the amino acid profile of sea bass, while the concentration of some amino acids (Arg, Ala and Phe) showed significant variations in sole. Feeding on artificial diets, which have shown their inadequacy a priori, resulted also in no significant effect on the profile of sea bass, but in a dramatic modification of the amino acid profile in sole. In addition, changes in the amino acid profiles considered as a whole were evaluated using the cluster analysis instead of paired comparisons between amino acid concentrations in each treatment. The analysis clearly separated profiles of larvae fed restrictedly or inadequately from their controls, irrespective of the species. This demonstrated the potential value of evaluating whole changes in amino acid profile as nutritional indicator. Besides, it was demonstrated that sensitivity of larvae to nutritional changes that may be reflected in the amino acid profile is greatly conditioned by the species and developmental stage.     

基于AHP的道路黑点交通安全影响因素分析及应用

阐述道路黑点交通事故的生成特征,通过AHP法建立交通安全影响因素的层次结构模型,形成了诸因素重要程度量化分析方法,为减少和预防密集型交通事故提供切实依据;应用该方法对某大型交叉口进行了分析和计算,确定了各安全影响因素的权重,提出了相应的安全保障措施。     

农药产品中添加未经登记成分的调查与分析

通过连续6年的福建省农药市场监测,对擅自添加未经登记农药成分的278份样品进行统计分析,研究表明:被添加农药的产品主要为杀虫剂,剂型主要为乳油、可湿性粉剂,多登记在蔬菜、果树、茶树、水稻、棉花上;添加的农药品种主要为有机磷类和拟除虫菊酯类杀虫剂,其防治对象与原产品相比有的属于防治谱相同,有的属于扩大杀虫谱。同时指出该行为的危害性,提出加强监管、出台检测标准和判定标准的建议。