深层搅拌桩在堤防修复中的应用及效果评价

介绍了深层搅拌桩在堤防修复工程中的应用。根据工程地质和水文地质条件,建立处理区域的三维有限元模型,分析其渗流性态和稳定特性。结果表明,深层搅拌桩应用于堤防修复中满足工程要求。     

‘寒富’苹果短枝型特征的解剖学评价

以‘寒富’苹果及其亲本(‘东光’ב富士’)为试材,通过田间调查和解剖学方法,研究‘寒富’苹果短枝型结构特点.结果表明:‘寒富’苹果1 a生枝的平均长度和节间长度小于亲本;枝条粗度、节位数和尖削度高于亲本,具有明显的短枝型性状;‘寒富’苹果叶片厚度和叶脉突起度均大于亲本,叶片的栅栏组织细胞排列为3层,栅栏组织细胞形状较为细长,栅栏组织与海绵组织的比值大于1,叶片的气孔孔径大于亲本,但气孔密度小于亲本.‘寒富’苹果枝条皮部比率大于亲本,为43.11％;材部比率和材/皮小于亲本,分别为56.89％和1.32.由此可看出,‘寒富,苹果短枝型性状较明显,具有典型的矮化特征.     

正齿行星轮分插机构的动力学分析

采用推导的刚体复合运动微分方程和动力学方程组逐次求解的方法对正齿行星轮分插机构进行动力学分析，建立其动力学模型，得到在插秧过程中链条、太阳轮轴心、中间轮轴心、行星轮轴心、太阳轮与中间轮啮合点和中间轮与行星轮啮合点受力与行星架转角的关系，为进一步对该机构强度分析和动力学优化提供理论基础。     

采收期及贮藏方式对瓦里短枝苹果生理变化的影响

为研究采收期及贮藏方式对瓦里短枝苹果生理变化的影响,以瓦里短枝苹果为材料,在室温(温度16~27℃,RH 28%~40%)、地窖(温度13~18℃,RH 54%~62%)和冷藏[温度(4±1)℃,RH 85%~95%]条件下进行试验。结果表明:①盛花后157 d,单果质量无明显增加;②室温贮藏10 d,采摘Ⅴ、Ⅵ期果实乙烯释放高峰出现,达到可食用状态;贮藏20 d,采摘Ⅱ、Ⅲ期果实硬度较高;③地窖贮藏下,Ⅱ~Ⅳ期果实乙烯释放高峰分别出现于25 d、20 d2、0 d,贮藏30 d时果实硬度依然保持在6.00 kg.cm-2以上,风味良好;采摘Ⅴ、Ⅵ期苹果贮藏20 d后,硬度均降到5.00 kg.cm-2左右,肉质绵;④冷藏条件下,不同采摘期果实贮藏120 d后,硬度均在6.00 kg.cm-2以上,可溶性固形物含量15%,贮藏特性良好。     

农村防洪工程堤线布置与堤型选择

以某农村防洪工程为例,根据流域规划、工程现状、地形条件等因素,按照防洪标准,确定堤线布置形式。提出堤型方案,通过技术经济比较,确定合理堤型,即采用梯形断面均质土堤。     

Effects on erosion of two post-fire management practices: clear-cutting versus non-intervention

The different erosion responses derived from two contrasting post-fire management approaches were evaluated: the clear-cutting and immediate removal of the burnt trees and; the non-intervention, that is, leaving the vegetation untouched and the burnt trees standing. Erosion rates were obtained from 200 m² experimental plots, large enough to include the complete processes of rill and inter-rill erosion. Erosion rates of the clear-cut plot were very similar to those of the non-modified plot. Part of the burnt trees was still economically usable. The trees left in situ gradually decayed and were tumbled by the wind; the fire risk incremented. The opening of timber track networks without conservation measures was one of the most important erosion problems associated with clear-cutting. The complementary practice of brushwood dike-construction would need a preliminary study before being applied.     

Further evidence on the effects of gene H,which confers cane hairyness,on resistance to raspberry diseases

Summary Gene H determines cane hairyness in raspberries and was reported to facilitate escape from infection by Botrytis cinerea and Didymella applanata. However, experiments with mycelial inoculations of wounded canes showed that it conferred a form of resistance which was evident for a long period after the establishment of infections by these pathogens. The gene also contributed to the resistance of fruit to B. cinerea and of canes to Leptosphaeria coniothyrium. Alternative hypotheses to explain these observations are discussed: two based upon its possible genetic linkage with a gene or genes for resistance and one based upon its possible pleiotropic effects.     

基塘生态农业工程模式的能值研究

应用能值分析方法及最新推出的评价系统可持续发展能力的能值指标(EISD),分别对珠江三角洲地区的三水市的3种基塘生态农业工程模式进行系统层和子系统层的能值比较研究。分析评估结果为:模的可持续发展性能(EISD)最强。其EISD比模式、分别高出58.3%和29.7%;种植业子系统经济效益好,但影响环境,是模式内可持续发展性最差的子系统;畜牧业子系统生产环效果不佳,但增益环效果明显;渔业子系统经济效益好,环境影响减小,是系统内可持续发展性最强的子系统,引入翘嘴鳜的生态经济边际效益显著。研究表明,基塘模式是实现农业可持续发展的一大方向,发展应走面向市场,不断完善内部循环的道路     

枣品种枣股有效结果年龄与丰产性的关系

根据枣股的有效结果年龄,把调查的125份枣品种分为4个类型:1～3龄枝结果为主;2～9龄枝结果为主;1～9龄枝结果为主和2～6龄枝结果为主,它们分别形成各类品种产量的85%以上。“1～3”型品种早果性强,早丰性好.但成龄树立体结果能力极差;“2～9”型品种早果性差,但开始结果后产量上升快丰产稳产:“1～9”型品种多数为小果型品种,虽早果性强,但早丰性差,盛果期树立体结果能力强;“2～6”型品种早果性较差,并有不同程度的大小年现象。     

CANINE HIP DYSPLASIA

It is the purpose of this study to call attention to new bone production that often occurs early in the sequence of pathological changes associated with canine hip dysplasia. New bone production extending to bony remodeling, as well as femoral head subluxation, both occur in the sequence of pathologic changes associated with canine hip dysplasia. Subluxation is considered primary, while osteoarthrosis is a secondary feature, and both are used in the diagnosis of canine hip dysplasia. This report concerns the significance of the presence of a solitary bony osteophyte, or spur, that is frequently evident on the caudal aspect of the femoral neck as viewed on the conventional ventrodorsal projection. This report utilizes findings from pelvic radiographs of 605 dogs (five breeds). There was a greater frequency (54%)of this bony change in cases diagnosed radiographically as dysplastic than in cases diagnosed as normal(15%).Thus, it is suggested that this minimal radiographic change can be used as an indicator of early canine hip dysplasia, especially in the absence of subluxation of the femoral head.