一种提升AutoForm分析效率的方法

介绍提高AutoForm软件分析效率的两种途径,分别是:针对每个零件制作各自的设置模板文件,通过引用模板文件,减少操作步骤,可节约分析时间15 min,同时将分析文件的存储空间减小到原来的45%左右;针对每个零件建立模面控制线数据库,通过引用控制线数据库,将拉延模面的建立的效率提高了20%,进而提高了整体分析效率。     

汽车加油口双色注射模设计

分析了汽车加油口塑件结构,确定了注射成型方案、进胶方式,并介绍了通过滑块与开模动作配合实现塑件脱模的过程。     

锅炉二次风道流动特性的模拟优化

以武汉武锅能源工程有限公司设计的二次风道为对象,运用数值模拟的方法考查了改造前后二次风道各出口空气的速度分布和质量流量分配情况。结果表明,通过布置弧形挡板,风道出口速度的均匀性显著提升,最大变异系数Cv由29%下降到9%,而且还避免了因风速不均引起的烧边现象。此外,改进后风道各出口空气的流量分配非常接近理想工况,与理想工况的偏差从9.9%缩小到2.1%。     

甘蔗糖厂双臂式半自动挂钩桅杆卸蔗机与喂蔗台的应用技术

甘蔗糖厂陆地运输的甘蔗卸至喂蔗台的主要形式有:桥式双梁吊车、旋臂桅杆卸蔗机、双臂式桅杆卸蔗机等。主要简述了目前常见的双臂式半自动挂钩桅杆卸蔗机的结构与工作原理,并介绍了在埃塞俄比亚OMO-KURAZ3糖厂改造中应用的固定双臂式半自动挂钩桅杆卸蔗机与喂蔗台的应用技术。     

下荆江熊家洲至城陵矶弯曲型河段河床调整规律

三峡水库运用后, 坝下游水沙过程发生了较大调整, 对下荆江熊家洲至城陵矶弯曲型河段河床冲淤演变造成较大影响, 从而对本河段河势稳定、防洪、航运等可能造成不利的影响, 基于此, 根据最新实测资料分析水沙条件变 化及其对本河段河床调整规律的影响。研究成果显示: 三峡水库运用后, 水流含沙量大幅减小, 且水库调蓄导致熊 家洲至城陵矶河段在枯水期径流量明显增加, 使弯道主流长期偏向于凸岸, 引起凸岸边滩大幅冲刷, 这是近期该河段发生“撇弯切滩”的主要原因之一; 随着三峡上游干支流水库群陆续建成运用, 坝下游河道将会长期遭受清水冲 刷, 河床仍将呈单向冲刷下切的趋势, 弯顶段主流平面摆动仍将较大, 弯道顶冲点也将相应下移, 导致主流贴岸距离 进一步下延, 引起河道岸线的崩退, 未来一段时期内典型弯曲型河道的局部河势变化仍将明显。     

汽车密封件双料一体旋转模具设计

针对PP+TPE汽车密封件设计了大型双料一体旋转注射模,介绍了二次合模的精确定位、可控注射系统、顶出平衡设计。该模具技术能够使两种性能完全不同的材料按照指定区域分布,并且达到塑件尺寸的精度需求,实现同时与钣金、玻璃、塑件等不同材质的零件进行复合配套。本项目实施后,在模具精度、寿命等方面接近或部分达到国外同类产品先进水平,而价格仅为国外产品的40%,性价比优势明显。     

Purchase intention for hydrogen automobile among Chinese citizens: The influence of environmental concern and perceived social value

Although hydrogen automobile has attracted increasing attention in recent years, previous studies did not extensively investigate customers' purchase intention for hydrogen automobile, as well as the factors that might affect their purchase intention. The present study therefore investigated whether customers' environmental concern and perceived social value of green buying would affect their purchase intention for hydrogen automobile. Customers' green buying behavior was included as a mediator, and their monthly income and gender were included as moderators. Data from 300 adults in China were collected. Results from structural equation modeling showed that customers’ green buying behavior fully mediated the positive association between perceived social value and purchase intention for hydrogen automobile. Further multi-group analysis found that monthly income and gender had moderating effects on the associations between some of the study variables. Based on these findings, possible explanation and practical implications were discussed.     

Designing Champion Nanostructures of Tungsten Dichalcogenides for Electrocatalytic Hydrogen Evolution

Fine-tuning strain and vacancies in 2H-phase transition-metal dichalcogenides, although extremely challenging, is crucial for activating the inert basal plane for boosting the hydrogen evolution reaction (HER). Here, atomically curved 2H-WS₂ nanosheets with precisely tunable strain and sulfur vacancies (S-vacancies) along with rich edge sites are synthesized via a one-step approach by harnessing geometric constraints. The approach is based on the confined epitaxy growth of WS₂ in ordered mesoporous graphene derived from nanocrystal superlattices. The spherical curvature imposed by the graphitic mesopores enables the generation of uniform strain and S-vacancies in the as-grown WS₂ nanosheets, and simultaneous manipulation of these two key parameters can be realized by simply adjusting the pore size. In addition, the formation of unique mesoporous WS₂@graphene van der Waals heterostructures ensures the ready access of active sites. Fine-tuning the WS₂ layer number, strain, and S-vacancies enables arguably the best-performing HER 2H-WS₂ electrocatalysts ever reported. Density functional theory calculations indicate that compared with strain, S-vacancies play a more critical role in enhancing the HER activity.     

复杂型急倾斜煤层的开采技术探析

中国煤炭资源多处于中厚煤层中,伴随煤炭资源的不断开采,矿井深度日渐增加,煤层的开采环境也日渐复杂,其中复杂型急倾斜煤层对开采技术和开采施工工艺水平的要求较为突出。课题基于中国复杂型急倾斜煤层开发工艺的现状,深入分析了现有工艺在实际开采过程中存在的不足,提出了伪倾斜斜坡短臂采煤法,旨在为中国复杂型急倾斜煤层开采工艺的研究提供借鉴。