Construction and Thinlcing of Rural Libraries --Taking the Heilongjiang Provincial Public Library Service Work in Rural Areas as an example

＂十一五＂以来,随着国家对农村公共文化事业的重视和大力投入,农村图书馆建设工作已经越来越引起图书馆业界的关注。黑龙江省图书馆在政策条件和技术条件的依托下,通过全国文化信息共享共建工程、总分馆制的实行、数字图书馆推广工程的建设,对农村公共文化服务事业的工作进行了有益的探索并取得了一些成果。公共文化服务体系下的农村图书馆建设工作是一项长期而艰巨的工作,应通过科学规划、合理投入、重点帮扶、自主创建、组织培训、设立农村图书馆基金会等方法实现其可持续发展。     

普洛马林和刻芽处理对2年生樱桃幼树分枝特性的影响

以2年生樱桃幼树(9-19/马哈利)为试材,研究了普洛马林和刻芽等处理对樱桃幼树分枝特性的影响。结果表明,与对照处理比较,采取涂普洛马林、刻芽+涂普洛马林和刻芽三种措施均能显著促进樱桃幼树萌芽抽枝。其中,刻芽+涂药处理相对于仅刻芽和涂药处理,更有利于促进中心领导干萌生较多的侧生枝,不仅萌发的新梢数量多(28条),单株叶片数量也最多(818个),且分枝高度合理(60～140 cm),各方位的分枝数目接近1∶1∶1∶1,树体结构匀称、合理。     

农业类上市公司独立董事特征与绩效关系研究

以农业类上市公司为研究样本,建立相关模型,然后运用回归分析法研究农业上市公司独立董事的特征对其绩效的影响.结果表明:独立董事比例与公司绩效的关系没有显著正相关关系;独立董事的平均薪酬对公司绩效显著正相关;独立董事的董事会议平均出勤率与公司的每股收益无显著正相关关系;女独立董事的比率与公司绩效没有显著的正相关关系;独立董事的平均年龄与公司绩效之间的关系不显著.     

湟水北干渠南门峡四支渠工程落水洞地基处理方法

针对湟水北干渠南门峡四支渠工程区域的自然条件,分析了黄土落水洞的成因,进而提出处理方案,并对方案进行了比较和选择,以为工程施工的顺利进行提供参考。     

不同春化处理对蚕豆表型的影响

[目的]探讨不同春化处理蚕豆芽苗对蚕豆表型的影响。[方法]以鲜食蚕豆通鲜2号为材料,对蚕豆芽苗进行了不同春化温度、时间的二因素裂区试验。[结果]蚕豆的分枝数随着春化温度的升高和春化时间的延长表现出增加趋势,而蚕豆的总荚数随着春化温度的降低和春化时间的延长表现出增加趋势。[结论]为蚕豆芽苗人工春化技术的应用提供理论依据     

生殖隔离形成机理的杂合子低适合度分化模型

通过用RR、Rr和rr3种基因型的适合度之比,量化R与r基因在后代中的频率,计算r的频率逐代演变的分岔点,研究随机交配群体中的杂合子适合度低于纯合子适合度的突变基因r在群体中的逐代积累过程。揭示了R与r在遗传中的不相容性;遗传漂变能使r在新群体中有较高的频率,超过分岔点,最终形成生殖隔离;同时生物进化的动力仅有突变、遗传漂变、自然选择这3个条件还不够,还需要有杂合子适合度低于纯合子适合度的突变基因,即原有群体的遗传背景对新突变的排斥作用。     

信息时代提高图书馆部主任工作能力的举措

本文引用移植管理学的有关知识，在简要论述图书馆部主任工作的客观环境的基础上。浅谈做好主任工作所具备的能力取向，以期能对图书馆在部主任的选用与培养和自身胜任能力方面有所帮助。     

CAD教学中引入“产品主任设计师”模式与创新能力的培养

CAD（Computer Aided Design计算机辅助设计）是高校普遍开设的一门主干课程,传统的教学方法往往不能很好地突出其专业性和实践性强的特点,达不到应有的教学效果。分析了CAD教学中存在的问题,提出了对计算机辅助设计课程改革的具体措施,通过合理配置教学要素,采用＂产品主任设计师＂教学模式,培养学生应用能力和分析解决问题的能力。     

Crown reaction and acclimation to cyclical V-trimming of city trees: An analysis using terrestrial laser scanning

Trimming is an important practice for reducing potential contact between trees and power lines. V-trimming occurs when a tree is located directly under the electrical wires and results in the formation of a bilateral crown, but not much is known about a tree’s reaction and acclimation to such a repeated stress in an urban context.Using Terrestrial Laser Scanning (TLS), we present a study that focuses on documenting (i) short term effect of V-trimming on the tree structure, through the quantification and analysis of the dispersion of trimming induced branch loss and subsequent growth reaction, and, (ii) long term acclimation (i.e. changes in biomass location) of tree structure to repeated unidirectional trimming. A voxelisation method was used to derive space exploration metrics from TLS data based on explored volume quantification and voxels dispersion within the tree crown.Our results show that V-trimming induces a significant decrease in explored crown space volume (12.8% on average) but that this loss is regained by trimmed trees within only 1 year following trimming thanks to a rapid regrowth rate. This was supported by an analysis of radial growth that showed that the growth of trimmed trees was greater than non-trimmed trees although this tendency was not statistically significant. In our study this regrowth was achieved without suckering; instead the regrowth mainly occurred within the crown periphery. We also observed that trimming had a significant influence on the way trees explore space with their crowns. While non-trimmed trees explored space preferentially toward a South direction, trimmed trees explored space in directions perpendicular to the wires (East and West). We also observed that crown biomass was located more in the extreme crown periphery in trimmed trees compared to non-trimmed trees.     

Examining strain propagation in the branch unions of Quercus alba L. and Quercus montana Willd.

Branch failure resulting from static loading events can be caused by ice, snow, or a climbing arborist aloft in a tree and can cause power outages, road blockages, costly property damage, or personal injury. In previous studies, researchers calculated bending stress to investigate the load-bearing capacity of branches. Yet, these calculations require geometric measurement of the wood that may not always be readily measure post failure. As stress and strain are linearly related, this study used static loading trials and digital image correlation to measure strain, tissue displacement, to gain insight on how loads move through the branch union zone. The results indicate that strain is located distally in the branches and diminishes through the branch union zone, suggesting that branch unions may serve a role in the damping of loads in trees.