简易多条带钢卷取机改造设计

新的简易多条带钢卷取机是昨用摩擦片实现滑差式多条卷取，它能实多条窄带钢单条卷取，卷取力大小可以调节，并能降低工人劳动强度，提高生产效率。     

浮选新工艺

<正> 中南矿冶学院矿物工程系用分支串流浮选取代常规浮选的实验室试验,浮选药剂以yy油取代柴油,用P 8201代替松醇油或仲辛醇等,其对比试验的效果见表1、2。     

橡胶增强的苯乙烯透明树脂组合物及其制备方法

一种橡胶增强的苯乙烯透明树脂组合物，该树脂组合物含有用橡胶聚合物增强的苯乙烯共聚物，其中树脂组合物中的丙酮可溶树脂组分的单体组成包括：质量分数为5％～70％的芳族乙烯基单体(a1)，质量分数为30％～95％的不饱和羧酸烷基酯单体(a2)，质量分数为0～50％的乙烯基腈单体(a3)，以及质量分数为0～50％的可与这些单体共聚合的另一种单体，     

狂PK的狂想曲

时隔前一次写“稀饭第九页”已经半年多了,我搬到了离单位较近的地方,已经不用像上次写的那样将刷牙和早饭这两项工作同时进行了,上班只要步行10分钟(假想图:需要坐3小时公车才能到单位的柳絮飞作崇拜状)。时间充裕了许多后,让我能有时间考虑许多问题,比如理想。以前我曾有很多     

活塞裙部润滑分析(上)

<正> 1 前言长期以来,活塞组件一直被认为是发动机机械摩擦损失的主要来源,而且又是表示其可靠性和耐久性的要害润滑界面。目前,已有几种试验方法,用于研究实际工作中的发动机活塞组件的摩擦情况。但是,目前还不可能在这些试验中分离出裙部的摩擦情     

Training for an agricultural discrimination task

Skeleton weed, centaurea juncea, is a declared weed in Western Australia because it competes with grain crops for nutrients and moisture. When it is found during harvesting, mechanised teams search and eradicate it. In an earlier report of field trials (Hartley et al, 1989) it was reported that search teams' detection rate was poor and since search teams had usually never seen skeleton weeds, visual discrimination learning was to be expected and observed during searches. The present study investigated the nature of this discrimination learning in a laboratory by developing a training programme of colour photographic slides of weeds in stubble. Subjects receiving specific training with feedback on their performance compared with those receiving pseudo-training showed a significant improvement in detections. Subsequently the benefit of the programme was validated in a field trial.     

Ergonomics in sickle operation

Sickle operation in harvesting has been analysed with reference to design features of nine different types of sickles, and field and laboratory based investigations on biomechanical stresses and physiological valuation on six farmers. It has been indicated that the blade geometry contributes significantly to human performance and there is ample scope for further design optimisation. The suggested modifications are: (i) sickle weight - 200 g; (ii) total length of sickle - 33 cm; (iii) handle length - 11 cm; (iv) handle diameter - 3 c cm; (v) radius of blade curvature - 15 cm; (vi) blade concavity - 5 cm; (vii) serrated sickle: tooth pitch - 0.20 cm and tooth angle - 60 degrees; (viii) ratio of the length of cutting surface to chord length - 1.20.     

基于深度学习的内容推荐算法研究综述

推荐系统是学习用户偏好,实现个性化推荐的系统化应用技术,在商品购买、影音推荐、关联阅读等多领域得到了广泛的应用。近年来,随着多源异构数据的激增和深度学习的兴起,传统推荐算法中的表征学习模式逐步被深度学习代替。梳理推荐算法的背景和发展趋势,并给出内容推荐的算法思路及其优劣评价,分别介绍多层感知机、自动编码器、卷积神经网络以及循环神经网络等深度学习方法的网络结构和算法优势。从技术应用的视角综述深度学习在内容推荐中的应用现状与研究成果,对不同经典深度推荐算法进行分析与比较。在此基础上,指出深度学习在可解释性、学习效率等方面的不足,并对交叉领域学习、多任务学习、表征学习等未来研究方向进行展望。     

铁基超微晶合金磁滞回线偏移的研究

研究了超微晶Fe78.5Cu1Nb3Si13.5B9合金在五种不同热处理条件下磁滞回线对称和非对称性。产生直流磁滞回线偏移的热处理条件是在纵向直流磁场中冷却到奈耳温度以下（本合金到室温），该合金磁滞回线偏移率△Hc／Hc可高达90％。还发现批量化生产的样品的偏移率明显高于实验室样品的偏移率（29％）。对磁滞回线偏移的机理进行了初步探讨并试用交换各向异性予以解释。