基于Spring的事务处理机制的应用与研究

文章介绍事务的管理机制及Spring中事务的五种实现方式,对五种实现方式进行分析比较,建议使用基于@Transactional注解的事务定义方式。     

Development of a spring analogue approach for the study of pillars and shafts

In civil and mining operations that involve ground excavation and support, the loads are distributed between the ground and support depending on their relative stiffness. This paper presents the development of conceptual single-degree-of-freedom models, which are used to derive equations for estimating displacements and stresses for ground-support interaction problems encountered in pillars in room-andpillar mining(natural support system), and liners for circular vertical shafts(artificial support systems).For pillar assessment, mine-pillar interaction curves can be constructed using a double spring analogy.Additionally, the effectiveness of different support systems can be evaluated depending on their effect upon the mine-pillar system. For shaft design, an initial estimation of the required lining strength and thickness can be readily made based on a double ring analogue. For both problems, the results from the proposed approach compare well with those obtained by finite element numerical simulations.     

山西省介休县洪山泉流量动态系统分析

为查明洪山泉域人为开采量的开采程度，在前人研究基础上建立了现阶段泉流量一降雨量的线性模拟模型。通过对模型的系统辨识，对系统的“慢时变”现象作出了合理解释．并发现系统在1994年以后发生了“快时变”，从而说明人为开采量从1995年开始迅猛增加；另一方面，自相关分析表明其宏观周期基本不变，说明人为开采量还没有达到足以改变其宏观频率的程度。也就是说，现在开始抓好该地区水资源的管理工作还为时不晚。     

和则相生同则不继——杭州玉泉景点整修扩建工程方案设计

针对杭州“玉泉观鱼”景点整修和扩建具体内容的不同,设计分别确立了“修旧如旧”和“和而不同”这两个原则以区别对待。使得新老两园既相联系又相区别,彼此间相辅相成,各自从不同侧面完成对原有主题的表达———“鱼、水、天、人的自在共乐”。其中,北园强调已有的“整形建筑围合空间内‘鱼+水+人’的静态的定势交流”,南园则强调“自然山水开放空间中‘水+鱼+人’的动态的即兴的游戏”。     

前形与后貌相去三十年——南京珍珠泉旅游度假区办公楼改建设计

烂尾楼是未完成的半拉子楼房建筑,由于业主意愿更改,或业主变更的后期接手者与原主人期望不一,对原设计或多或少均有所改动.该文通过南京珍珠泉旅游度假区原鳄鱼景区管理用房,改建成度假区管理委员会自用的办公楼这一具体工程实践,初步探讨此类工程项目需要注意的一些问题.     

电解槽罩板装卸装置的设计研究

电解槽罩板装卸装置是安装在铝电解多功能起重机上的辅助生产装置。文中阐述了该装置设计研究的重要性,介绍了国内外的研究现状及目前槽罩板的结构形状。文中以一种结构的槽罩板为基础,并综合考虑其他槽罩板的形状进行了设计研究,介绍了该装置的设计方案,详细地说明了该装置的布置形式及结构组成,并对各组成部分的功能及特点进行了分析论述。文中详尽的阐述了电解槽罩板装卸装置的工作原理及工作过程,对夹具装置中关键部件支撑弹簧进行了设计计算,确保了其强度、稳定性及功能。     

基于防洪视角的传统聚落水系空间结构探析——以北方四省泉水聚落为例

泉水聚落是人类临泉而居所形成的的特殊聚落形态类型,而泉水溢流形成的水系则是泉水聚落空间结构中最具魅力的景观因子,其外在形态受自然地形地貌、防洪排涝、生活取用和景观需求等多方面因素共同驱动而成。该文从汛期行洪影响的角度出发,对传统聚落适应各种制约因素而呈现的具体水系形态进行对比分析,总结了因此而诱发的多种类型。     

变量齿轮泵的新机制研究与微圆槽的卸荷能力分析

为实现功率和排量的同步变化以节省资源,提出一款齿轮泵变量的新机构,该机构原理简单,由变量弹簧力和高压油压力的动态平衡驱动齿轮副有效啮合宽度的自动变化,从而实现泵功率和排量随有效啮合宽度的同步变化;并就其困油性能与困油卸荷进行深入研究和分析,提出具有微圆结构的卸荷槽;最后,进行实例运算和分析。结果表明:微圆卸荷槽具有更大的卸荷面积和卸荷能力;有效啮合宽度越小,困油压力峰值越小,困油性能越好;反之,困油性能越差,但影响不大。     

Spring Maize Yield Estimation based on Radiation Use Efficiency and Multi-temporal Remotely Sensed Data

In order to develop highly accurate model for crop yield estimation,an approach of retrieving regional crop yield was studied by Radiation Use Efficiency (RUE) and remote sensing data,the Jifangzha irrigation is of Hetao irrigation district of Inner Mongolia Autonomous Region was selected as a research case.Based on this model,the difference of the Dry Matter Accumulation (DMA) between the maize’s different growing stages is made and a comparative analysis of the measured yields,and the predicted results based on this model.The results show that the DMA of the maize’s jointing stage is maximal,about 40% of total amount.The measured yield and the predicted ones based on the model has a greater correlation,the Correlation Coefficient was 0.853 and passed the reliability of 0.01.The difference of the DMA in different growing stages showed that the sensitive degree was displayed between main growing stages and yield,and that were some key aspects:the main limiting factor in growing stages and raising yield.These results indicate the model for spring maize yield estimation is feasible and effective based on the RUE and multi-temporal remotely sensing data.     

Galvanising and galvannealing behaviour of B added TiNb IF high strength steel

Abstract

Solid solution strengthened steels stabilised with Ti and Nb are known to have poor galvanising and galvannealing properties. When these steels are alloyed with boron to prevent cold work embrittlement, the selective oxidation processes are influenced by the presence of B. The continuous galvannealing process has therefore been simulated in a laboratory in order to study the effect of B on the fundamental surface and interface processes that control the wetting of the surface by liquid Zn, the inhibition layer formation, and the Fe-Zn reaction.