深水炸弹的自导基阵减振结构设计及降噪性能研究

介绍了一种适用于深水炸弹自导系统的换能器基阵减振结构设计方法,并通过试验手段结合不采取减振措施的基阵,对其减振措施的有效性进行了分析。     

欧美水泥混凝土路面构造及其降噪评价

较高的噪声和抗滑耐久性不足是水泥混凝土路面的两大难题,本文针对此介绍了欧美普遍使用的混凝土路面构造,包括人造草皮拉毛、粗麻布拉毛、横向刻槽、纵向刻槽、金刚石研磨以及露石混凝土路面、透水混凝土路面等,并对其降噪效果和抗滑性能进行评价。     

不锈钢管坯外表面局部修磨设备的研制

为了解决大规格不锈钢坯料管由于穿孔机热加工后造成管坯局部区域壁厚不均,需通过后续冷轧管机或冷拔管机进行纠偏加工,生产加工道次增多,且效果不理想的问题,设计了单边(局部)浮动磨削加工修磨机。介绍了该修磨机的主要技术参数,各设备单元的结构组成及其主要功能。并采用该修磨机对某规格不锈钢坯料管进行了修磨,修磨后的产品光滑、接刀处圆弧过渡,实现了设计要求,满足了生产需要。     

The effects of oxygenation aeration treatment on dissipation behaviors of tricaine mesylate in carp (Cyprinus carpio) muscle and water

Tricaine mesylate (MS-222) is one of the most used anesthetics in fish. It can be absorbed by the human body via food consumption, with related detriments to human health. In this study, a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was developed for the determination of MS-222 in carp muscle and water samples using liquid chromatography-tandem mass spectrometry (LC-MS/MS). For cleanup procedure, multiplug filtration cleanup (m-PFC) method with n-Hexane delipidation was adopted. The extraction solvent, cleanup methods and sorbents were optimized. All method validation parameters were in the acceptable range. The dissipation behavior study was followed by the method development. Firstly, the anesthesia dose and time were optimized in application study. Secondly, carps were revived for different period of time with (experimental group) and without (control group) the oxygenation aeration treatment to compare the dissipation rate of MS-222. After being anesthetized for 6 h at 50 mg/L and 12 h of elimination, the concentrations of MS-222 in crap muscle and water of experimental group was lower than those of control group. After 36 h of elimination under oxygenation aeration, over 90% of MS-222 was dissipated in carp muscle. The results showed that the half-life of MS-222 in carp muscle was 6.2 h. The findings suggested that the commonly-used oxygenation aeration treatment in aquaculture production had potential effects in accelerating the dissipation of MS-222 in carp and water. In this study, three days of withdrawal period was recommended in carps after MS-222 administration under oxygenation aeration.     

包钢选矿厂磨矿自动化系统

文章介绍磨矿微机控制系统的组成、工作原理及特点.将微机技术用于磨矿控制系统中,可实现生产过程的自动化和设备管理的现代化,保证控制系统的可靠性、长期稳定性及稳定生产过程.实现了最佳经济技术指标,取得很好的效果.     

包钢选矿厂磁矿系列磨选流程分析及改进

针对包钢选矿厂磁矿系列磨矿选别流程中存在的磨矿产品过磨现象严重,影响选别效果,工艺技术指标偏低、能耗高等问题,对采用阶段磨矿阶段选别新工艺进行研究,实现阶段磨矿阶段选别后,粗选尾矿直接抛尾,提前回收部分合格精矿,粗精矿再磨再选可提高目的矿物的单体解离度,达到优化选别指标,减少选矿加工费用的目的.     

深孔磨头的设计

对于深孔磨削的磨头 ,最主要的是要保证磨头具有足够的刚度和回转精度 ,否则在加工过程中易产生振动 ,使被加工零件难以达到所要求的精度和表面粗糙度 ,甚至损坏砂轮。深孔磨头的设计主要是克服上述缺陷 ,提高加工精度     

管磨机与球破机粉碎机理研究

本文由管磨机与球破机相关行业及其研究背景入手，说明课题的巨大研究价值。围绕水泥成品优质高产低消耗的目标，从管磨机与球破机料球截面筛析理论入手，揭示了管磨机与球破机的粉碎机理。由管磨机与球破机的机理比较引出了球破机与球磨机串联粉磨工艺理论，阐明了球破机作为新型破碎机械对水泥粉磨工艺的影响，必将对利用管磨机与球破机进行破碎粉磨的相关行业技术进步带来积极影响。     

滚刀的重磨与齿形误差

在齿轮传动中齿形误差是齿轮精度的重要指标 ,直接影响齿轮传动的工作平稳性 ,使轮齿在啮合过程中产生振动和噪声。而在影响齿形误差的各种因素中 ,滚刀的刃磨误差尤为重要     

基于神经网络质量模型的磨矿过程智能控制

通过分析实际磨矿过程的生产状况和基本生产数据,建立在磨矿过程中结合比值调节控制前水和给矿量,运用专家 系统对给矿量进行优化控制和基于神经网络质量模型的智能控制方法。实际仿真研究表明,该方法能够提高生产效率,解决磨矿 过程中有一定难度的溢流浓度和分级粒度控制问题。