农民工返乡创业的政府引导机制研究

政府的引导机制应包含以政策宣传为引导、以制定相关政策法规为保障、以政策帮助等方面为支持3个层面.在此基础上,从宏观的政府政策调整和微观的农民工自身能力提升等方面来构建农民工返乡创业的政府引导机制,旨在为农民工返乡创业提供长期有效的支撑和保障,提高返乡农民工创业的积极性和成功率.     

基于ADAMS的烟草移栽机用双曲柄连杆机构运动仿真分析

分析了烟草移栽机双曲柄连杆机构的工作原理,建立了该机构的运动学模型,采用ADAMS软件建立了该机构的虚拟样机模型,并测试其重要连杆和重要点的合成运动特性。仿真实验结果显示,双曲柄连杆机构的运动特性能够满足烟草移栽机的移栽运动要求。     

带可调导叶的双向潜水贯流泵装置水力性能

为提高双向潜水贯流泵装置正反向运行时的水力性能,该研究提出在叶轮前后布置可调导叶,并通过模型试验和数值模拟的方法研究其水力性能,对比灯泡前置和灯泡后置性能差异.研究结果表明:采用可调导叶的双向潜水贯流泵装置兼顾正、反向性能,灯泡前置和后置最优导叶角度分别为12°和20°,最高效率分别为67.9％和66.5％,最高效率点...     

导游职务履行权个案研究

本文以导游履行其职务权过程中的3个案例分析为切入点,针对案例中导游职务权履行出现的责任问题及其原因,提出了解决问题的措施,为创建和谐的导游市场提供参考。     

高校网络舆情引导与管理探析

由于高校和大学生自身的特性,加上当前经济社会发展过程中面临的一些矛盾和敏感因素,极易引起网络舆情。如何看待和认识高校网络舆情,高校网络舆情相对于一般网络舆情有什么样的特殊性,对于当前高校网络舆情引导和管理中存在的一些问题如何看待和解决,笔者结合工作实际和文献研究进行了一些探讨。     

深入开展农家书屋的阅读指导工作

从指导农家书屋读者获取文献资源、激发农村读者的阅读兴趣、引导正确的阅读方向等几个方面,分析了农家书屋开展阅读指导的具体方法,探讨了农家书屋深入开展阅读指导的新模式。     

导叶对双流道水力透平机性能的影响

参考低比转速混流式水轮机的叶片设计原理与双吸泵的结构型式,设计出一种卧式双流道混流式水力透平机,对导水部件采用4种不同翼型导叶的方案进行了探讨,从定性和定量2个方面评价了各方案水力透平机性能的好坏.结果表明:利用传统的头部较厚的导叶不利于水流绕流,在引、导水部件处能量损失严重,而添加头部修型的负曲率导叶的水力透平机效率最优,且转轮叶片面上的流场分布非常理想,确定其为该设计要求下水力透平机的导叶叶型,为将来水力透平机的结构优化和性能预测提供了理论依据.     

4YB-Ⅰ型甘蓝联合收获机的设计

为解决我国甘蓝机械化收获无适合机型的实际问题,结合西北地区甘蓝种植模式,通过理论分析,应用CAD技术,设计了4YB-Ⅰ型单行甘蓝联合收获机,研究了该机的整体结构和工作原理,确定了关键部件的结构参数.结果表明:4YB-Ⅰ型甘蓝联合收获机的作业速度为0.3m/s,圆盘割刀切割速度为6m/s,生产率为0.04～0.05hm2/h.说明该机结构简单、性能可靠,能为我国甘蓝收获的机械化提供技术参考.     

杉木胶合木的初步研究

本文探讨了利用杉木小径材生产新型基材———胶合木的方法，并研究了主要工艺参数对产品性能的影响，为优化生产胶合木的工艺打下基础     

Retinal degeneration in nine Swedish Jämthund dogs

The Jämthund is the fourth most common breed in Sweden with approximately 1600 pups registered each year. Although it has been known that some adult dogs go blind, so they cannot hunt, the Jämthund dog has historically not been screened for hereditary eye diseases. This report describes nine Swedish Jämthund dogs with retinal degeneration. These dogs represent all Jämthund dogs diagnosed with progressive retinal atrophy (PRA) by the Swedish Eye Panel and registered with the Swedish Kennel Club from January 1998 to September 2008. The dogs were examined with indirect opthalmoscopy and slitlamp biomicroscopy. Additionally, electroretinograms (ERGs) following ECVO guidelines were performed in two dogs (one affected and one normal) and the eyes from three affected dogs were examined by light‐microscopy postmortem. Typical findings were bilateral symmetric generalized retinal degeneration with tapetal hyper‐reflectivity, attenuation of blood vessels and pigment clumping in the nontapetal fundus. These retinal findings progressed with time in two dogs after re‐examination. Visual impairment, especially under dim light conditions, was observed in the affected dogs. ERG from one affected dog showed profoundly reduced rod responses, whereas cone responses were better preserved. Microscopic changes in the eyes from three dogs were characterized by a severe diffuse predominantly outer retinal degeneration and atrophy. Re‐sequencing of the prcd‐gene for eight of the nine investigated dogs revealed that none of the individuals carried disease allele that has been associated with prcd‐PRA in other breeds. In conclusion, ophthalmoscopic, electroretinographic, and light‐microscopic alterations observed in nine Jämthund dogs were compatible with PRA. The prcd mutation was excluded as a cause of this retinopathy.