焊接模拟仿真在高职实训教学改革中的应用

随着经济发展水平的不断提升,国家对高职院校教育教学的投入力度加大,高职院校的专业水平和实训水平都得到了很大的提升。对焊接专业的学生而言,只有通过实训才能获得焊接的操作技能。当前高职院校对焊接专业学生的教学仍存在重理论轻实践的问题。再加上焊接作业的工作环境相对恶劣,劳动者的工作强相对较大,焊接专业的学生若不能学好专业课,会对其今后的求职产生不利影响。为了提高人才培养质量,节约训练成本,对焊接模拟仿真在高职实训教学改革中的应用进行研究具有重要的理论与实践意义。文章介绍了焊接模拟仿真在高职实训教学改革中的背景和现状,以及在高职实训中引入焊接模拟仿真的优势,并提出了相应的改革对策。     

虚拟仿真软件提升教学效率

将仿真模拟技术引入实训教学,汽车仿真教学软件融合理论教学与实践教学为一体,实现了学生理论知识水平与操作技能的同步提高。学生使用仿真教学软件后,对汽车各零部件有了更深刻的认识,不仅高了实际操作过程中的效率,而且也增强了学习的自信心。     

基于IdeaVR工业机器人分拣系统的虚拟仿真系统开发

工业机器人自动化分拣系统在实训中存在资金成本高、资源场地少、操作过程复杂、具有危险性等问题。基于此,本课题小组开发了基于IdeaVR的机器人分拣虚拟仿真系统,实现了虚拟环境下机械臂的运动分析、运动控制和产品分拣的完整工艺流程,通过仿真和实训联动使得学生实训效果得到了极大提高。     

模拟仿真技术在飞机机电设备维修实训教学中的应用探究

本文研究在飞机维修实践教学中引入模拟仿真系统,对于提高学生操作技能、学校实践教学水平、节约教学资金具有重要意义。     

百万扩招背景下“四类人员”实践技能的培养探究

高职百万扩招生源多样、学生水平参差不齐,现有实训的平台和实训教学模式无法满足学生实践技能学习的个性化需求。本研究结合扩招学生特点及需求,提出适应高职扩招学生实践技能培养的实训教学模式、践行思路及体系架构,重点阐述了在实践技能培养中的实训基地建设和新型实训教材开发这两个着重发力点,以期为高职院校大力培养学生实践技能提供参考和借鉴。     

AR焊接模拟仿真在焊接实训教学改革中的应用

本文讨论了AR(Augmented R eality)模拟仿真教学在焊接实训教学中的应用特点,实现了电弧焊、气体保护焊的模拟仿真实训,清晰呈现了焊接的全部过程,改善了焊接训练环境,实现了焊接训练课程的个性化。并提出了焊接模拟仿真教学存在的不足和需要注意的问题。     

基于企业的五轴模拟机床在数控实训教学中的应用与思考

五轴数控加工实训是一门要求做中学、学中做的专业,在学生进入企业和学校的实训车间实训时,需要用到昂贵的多轴数控设备、多轴软件编程、高速刀具等,合理有效地使用五轴模拟仿真机床,有利于提高多轴数控实训教学的水平和企业培训成果,保护昂贵的多轴数控设备,同时为学校解决资金合理使用的难题。     

浅谈TSI发动机电控实验台的设计

TSI发动机多工况运行检测平台是基于迈腾原厂1.8TSI发动机研发的,具备模拟实车连线、教学演示及故障设置与诊断功能的电控发动机实验台,对于改善实训教学条件、提升学生实践能力具有重要意义。     

本科课程《数控机床实训》教学改革与实践

在数控实训教学中,教师要利用现有的教学设备,按照生产模式,在数控加工实训中开展行动导向与任务驱动的教学模式,让学生在实践操作中对工艺设计、加工步骤及现代数控技术有更深刻的了解。本文对本科课程《数控机床实训》教学改革与实践展开了探讨,提出了实践教学环节改革的思路。希望能对学生提高学习兴趣,培养创新精神,提高学生工程实践素质有所帮助。     

虚拟仿真技术在机械类专业人才培养中的应用研究

机械类人才培养注重学生实践动手能力培养.高校在机械类人才培养过程中,受相关课程特点、实验室硬件条件等的限制,存在学生实践动手能力培养受限等问题.利用虚拟仿真技术的沉浸式学习方式可使知识具象化、直观化,易于学生理解,提高学生学习兴趣.虚拟仿真实训平台可辅助进行实验教学及课程设计,解决高校实验硬件条件受限等问题,辅助高校强...     

Overland water and salt flows in a set of rice paddies

Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m⁻¹) and an infiltration rate of 5.8 mm day⁻¹. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day⁻¹), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day⁻¹ was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration.     

瓦房店市水果生产标准化发展研究

瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。     

金谷子耐旱TG118引种试种及推广应用

对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。     

对《种子法》存在问题的探讨

《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。     

Review of the Egyptian experience in implementing land drainage projects

About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered.     

和谐社会理论建设的几点哲学思考

在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。     

A European irrigation map for spatially distributed agricultural modelling

We present a pan-European irrigation map based on regional European statistics, a European land use map and a global irrigation map. The map provides spatial information on the distribution of irrigated areas per crop type which allows determining irrigated areas at the level of spatial modelling units. The map is a requirement for a European scale assessment of the impacts of irrigated agriculture on water resources based on spatially distributed modelling of crop growth and water balance. The irrigation map was compiled in a two step procedure. First, irrigated areas were distributed to potentially irrigated crops at a regional level (European statistical regions NUTS3), combining Farm Structure Survey (FSS) data on irrigated area, crop-specific irrigated area for crops whenever available, and total crop area. Second, crop-specific irrigated area was distributed within each statistical region based on the crop distribution given in our land use map. A global map of irrigated areas with a 5′ resolution was used to further constrain the distribution within each NUTS3 based on the density of irrigated areas. The constrained distribution of irrigated areas as taken from statistics to a high resolution dataset enables us to estimate irrigated areas for various spatial entities, including administrative, natural and artificial units, providing a reasonable input scenario for large-scale distributed modelling applications. The dataset bridges a gap between global datasets and detailed regional data on the distribution of irrigated areas and provides information for various assessments and modelling applications.     

粉质仪和拉伸仪在面粉生产中的应用

在介绍粉质仪和拉伸仪结构和原理的基础上,探讨了粉质曲线中吸水率、形成时间、稳定时间、弱化度和评价值等指标与面粉品质的关系,以及如何根据拉伸曲线中面团最大拉伸阻力、延伸度和拉伸曲线面积等指标来评价面团品质,并结合生产实际,概述了粉质仪和拉伸仪在面粉生产中的作用。     

农村信息化服务的现状及建设措施

分析当前我国农村信息化服务的现状,提出加强农村信息化服务的新举措。     

车辆ABS控制算法的研究及探讨

对现代汽车的ABS控制算法作了一些简单的介绍,同时指出了它们的一些缺陷,相应地提出了几种对ABS的其它控制方法并加以探讨,其中着重论述了ABS门限值控制算法中参考车速的确定方法和基于附着系数的控制算法。