基于沉浸式虚拟现实技术的注塑模具结构认知实验开发

针对模具方向注塑模具相关课程教学中出现的模具结构认知问题,提出基于沉浸式虚拟现实技术的模具结构认知虚拟实验室的建设方案,给出以UG与IdeaVR软件为平台的沉浸式虚拟现实实验室构建方法,开发集教、学、考、练多种功能于一体的注塑模具结构认知虚拟实验室,经过一年的实践应用,效果显著。     

浅议SQL注入攻击的原理及防御

伴随网络安全问题的日益严重,作为校园网信息聚集体的数据库系统也不断受到密码策略、系统后门等多方面的威胁。该文以目前广泛使用的MS SQL Server为例,讨论了常见的数据库安全漏洞——SQL注入攻击的检测及防御方案。     

Pro/E在《注塑模具设计》课程教学中的应用

针对高职院校《注塑模具设计》课程特点、教学条件、学生的实际情况,在教学实践的基础上,大胆地将Pro/E引入课堂,使用大量的图片、动画、录像(模具设计实操过程)及现场操作演示,对塑件进行工艺分析,对注塑模具零件的安装位置、连接方式、作用及工作原理进行讲解,激发了学生的学习兴趣,收到了良好的教学效果。     

薄壁容器注射模具设计与制造

介绍了薄壁容器塑件注射模具的设计与制造,将设计与制造紧密结合,在合理安排整套模具加工顺序和控制加工精度、配合精度方面作了一些尝试,并通过实践,取得了模具制造的相关经验。     

最大截面轮廓位于圆弧面上的塑料件的分型线创建方法

本文作者结合自身应用经验,基于UG NX软件CAD技术,针对注塑模具分型设计过程中最大截面轮廓位于圆弧面上的塑料产品,分型线难以确定具体位置,难以通过抽取零件边缘曲线等常规方法进行创建的问题,介绍了几种操作简单但行之有效的分型线创建方法。     

BASES Position Statement on Guidelines for Resistance Exercise in Young People

Abstract

Despite the performance concerns of dehydration in other sports, there are currently no data on the effects of rapid weight-loss on the physical and cognitive performance of jockeys in a sport-specific context. In a randomised crossover design, eight Great Britain (GB) male licensed jockeys were assessed for chest strength, leg strength, simulated riding performance (assessed by maximum pushing frequency on a mechanical riding simulator during the final two furlongs of a simulated 2 mile race) and simple reaction time after performing 45 min of exercise, during which euhydration was maintained (Control trial) or induced 2% dehydration (Rapid Weight-Loss trial). Reductions in both chest (–13.8 ± 3.03% vs. 0.62 ± 1.04%) and leg strength (–4.8 ± 4.8% vs. –0.56 ± 2.5%) were greater in Rapid Weight-Loss compared with Control (P < 0.01 and P = 0.04, respectively). Similarly, reductions in simulated riding performance were also greater (P = 0.05) in Rapid Weight-Loss (–2.8 ± 4.0%) compared with Control (–0.07 ± 1.5%), whereas there were no significant changes (P = 0.14) in simple reaction time. We conclude that a 2% reduction in body mass, as achieved by 45 min of moderate-intensity exercise undertaken in a sweatsuit (a common method of inducing acute dehydration by jockeys), significantly impairs maximum pushing frequency during a simulated race. In addition, the observed reductions in strength may also increase the occupational hazards associated with race riding.     

L—JETRONIC电控汽油喷射系统

通过对L—JETPONIC电控汽油喷射系统的介绍，论证了采用电喷技术的发动机其动力性、经济性及排放性等方面的优越性。     

CAD技术在注塑模设计中的实用性分析

随着工业的高速发展,CAD技术在注塑模设计中的应用越来越重要,CAD技术已经成为现代模具技术的核心和重要的发展领域。     

新一代大众1.4TSI发动机的技术革新

现代汽车发动机技术更新换代快,作为最新最有代表性的缸内直喷技术已越来越被广泛应用。大众新一代1.4TSI发动机比上一代1.4TSI发动机更能适应中国国情。新一代1.4TSI发动机改进成带进气冷却的进气系统,单增压的废气涡轮系统以及无回油漏燃油系统,性能更加优越。     

区段灌注技术-场放大进样-毛细管电泳手性拆分山茛菪碱

首次采用结合区段灌注技术及场放大进样的毛细管电泳技术对山莨菪碱四种异构体进行了拆分。详细探讨了溶液pH值、拆分试剂含量、分离缓冲充入时间、分离电压等对测定的影响,优化了实验条件。在75mmolL-1Tfis—H3P04（pH3．5）为分离缓冲溶液,1．7％羧甲基-β-环糊精（CM—β—CD,1．0psi,90s）为拆分试剂,分离电压17．5kV条件下,23分钟内完成山莨菪碱四种异构体分离。并通过场放大进样进一步提高了测定的灵敏度。该方法成功应用于测定颠茄制剂中山莨菪碱,结果满意。