圆柱坐标机器人在针织圆纬机中的应用

基于机器人与互联网的智能化新时代背景,针对传统针织圆纬机编织过程中断纱必须依靠人工操作接纱而一直无法用机器替代的问题,研发一种用于针织圆纬机的圆柱坐标机器人,以实现智能检测纱疵、自动清纱接纱以及多模态除絮工作。介绍圆柱坐标机器人的基本结构、工作原理、控制系统及应用优势。使用该圆柱坐标机器人可以自动清纱并复接,代替人工接纱操作和除絮步骤,有效降低运营成本,大幅度提高生产效率及织物品质,提升圆纬机智能化程度,推动圆纬机装备行业向智能化技术转型升级,为实现智能工厂、无人车间奠定基础

Iron and manganese oxides enhance electron output efficiency of Clostridium pasteurianum

[Background] Fermentative dissimilatory metal-reducing bacteria, which are capable of reducing metallic oxides, get energy from fermentation. Little is known about how metallic oxides affect electron output efficiency of fermentative dissimilatory metal-reducing microorganisms. [Objective] This study was conducted to explore the influence of iron and manganese oxides (Fe_2O_3/MNO_2) on electron output efficiency. [Methods] Different concentrations of Fe_2O_3/MNO_2 were added into fermented system containing glucose and inoculated 5% C. pasteurianum. Electrochemical activity of C. pasteurianum was detected. The concentrations of Fe(Ⅱ) and Mn(Ⅱ) were measured by ferrozine spectrophotometry and formaldoxime method. Fermentation substrate and metabolites of C. pasteurianum were detected by gas chromatography and high performance liquid chromatography. Lastly, we calculated the electron output efficiency. [Results] The current density peaked with the value of about 0.93 mA/m~2. The concentrations of Fe(Ⅱ) and Mn(Ⅱ) gradually accumulated. The consumption of glucose was increased by 9.4%/7.7%, Meanwhile, acetate production was increased by 37.5%/25.0%, and butyrate production was increased by 22.7%/6.8%. Additionally, hydrogen production was increased by 21.6%/9.8%, and the total electron output efficiency was increased by 24.27%/10.82%, respectively. The pH values between experimental group and control are no significant difference. [Conclusion] This study shows that iron and manganese oxides can improve the electron output efficiency of C. pasteurianum by increasing glucose consumption and buffering pH value. The results provide evidence for revealing the effects of multivalent metal oxides on the electron output of fermentative dissimilatory metal-reducing bacteria, and further expand our understanding of the interaction mechanism between multivalent metal oxides and fermentative dissimilatory metal-reducing bacteria.</p

高职院校学风影响因素调研

学风建设是高职院校学生工作的重点,影响着高职院校的人才培养质量,也影响着高职院校的声誉和竞争力。随着我国高等教育的发展,高职院校学生群体特征不断变化,给高职院校学风建设带来了新问题。及时了解学校学风状况,探究影响高职院校学风的因素,深刻研究学生的学习目的和学习动机等方面存在的问题,进而采取有效措施推动学风建设,成为高

Calculation of passive earth pressures on retaining wall considering soil arching effects of backfill clayey soil

为解释挡土墙后填土被动土压力的非线性分布现象,在考虑土拱形状为圆弧,滑裂面采用朗肯滑裂面的基础上,给出考虑土拱效应的被动土压力系数kAWn,进而基于应力状态法及土楔形体静力平衡两种思想求解了竖向平均应力V？公式,在该基础上,给出黏性土填料下的挡土墙被动土压力分布公式、合力公式及作用点高度计算公式。通过与试验与其他方法对比,文中提出的方法得到验证。最后,研究了黏性土填料下的挡土墙被动土压力变化规律,即考虑土拱效应求得的黏性土填料的被动土压力分布呈现上小下大的指数型分布。此外,随着δ/φ(δ为墙土摩擦角,φ为内摩擦角)的增大,土拱效应逐渐增强,土压力合力点逐渐降低。The nonlinear phenomenon which the passive earth pressure behind the retaining wall of both sand and cohesive soil is nonlinear distribution could be explained by the soil arching effect theory.The formula which calculated passive earth pressure coefficient of which assumed the stress state method and the soil wedge static equilibrium method were derived considering the soil arching effect, assumed arch as circle and the angle of slip surface as Rankine's theory.Then, the distribution of lateral earth pressure considering the soil arching was derived by the above formulations; also the formulas that calculating the magnitude and the point of application of lateral passive earth pressure were derived.The accuracy of proposed method is confirmed by comparing with the experimental tests and values from existing equations.Finally, the trends of distribution and the height of total passive earth pressure of clayey soil are studied; distribution of passive earth pressures considering the soil arching is likely an exponential curve; and the height of resultant earth pressure point is gradually reducing with increasing the ratio of soil-wall friction angle to internal angle δ/φ.国家自然科学基金资助(No.51209180); 浙江省自然科学基金资助(No.Y1091175

金电极上偶氮腺嘌呤的电化学行为研究

本文研究了光滑金电极上偶氮腺嘌呤的电化学特性,并确定了相关动力学参数.在含偶氮腺嘌呤的0.2mol·L-1的磷酸盐缓冲液（PBS,pH=4.0～10.0）中,发现其循环伏安图上出现一对氧化还原峰.基于对扫速和伏安峰值电位的分析,结果表明这是一个由吸附控制的可逆偶氮腺嘌呤氧化还原电化学过程.当pH值从低到高改变时,氧化还原峰值向负电位移动,证实H+参与了该反应.通过进一步实验数据分析和电极表面吸附量计算,发现该反应为分步进行的两电子两质子反应.最后,通过快速循环伏安扫描方法确定了电化学过程的表观传递系数α和表观速率常数ks

公共服务水平与经济发展水平相适应机制建设的本土探索——厦门市的案例研究

本文是厦门市社会科学调研课题资助项目——“厦门建立公共服务水平与经济发展水平相适应机制的研究“课题报告(全文5万余字)的摘要。该研究报告对公共服务与经济发展二者之间的相关性及其影响程度进行理论分析与实证检验;利用“公共服务——经济发展动态均衡模型“,对“十二五“时期厦门市公共服务与经济发展的相关性做出预测;尝试构建公共服务水平与经济发展水平相适应的机制;从建设服务型政府、确立最优公共服务水平、明确公共服务合理支出以及保障公共服务有效供给等方面提出了关于厦门市公共服务水平与经济发展水平协调发展的对策思考。2011年度厦门市社会科学调研课题资助项目;厦门大学“985工程”-公共管理重点学科;厦门大学“211工程”三期-“公共政策与政府治理”建设项

纪念《历史研究》创刊四十周年

今年是《历史研究》创刊40周年,许多作者、读者用题词、贺信、笔谈、论文等多种方式向本刊表示祝贺之意。对此,我们编辑部全体同仁向他们表示由衷的感谢。本刊决定,第一、二期为纪念创刊40周年专辑。本期发表一组笔谈及12篇学术论文,第二期为学术论文,其他栏目暂停。题词、贺信等,将另行出版。今后,我们将继续坚持以马克思主义为指导研究历史的编辑方针,执行“百家争鸣”政策,遵循“解放思想,实事求是”的路线,依靠作者、读者、编者的通力合作,办好刊物,为推动我国历史学的发展做出新贡献

The Role of Working Memory in Age Differences in Mental Arithmetic

我们以前的研究表明[1 ] ,心算加工年老化过程存在两个中介作用因子 ,可能分别与认知加工中的记忆成分和速度成分有关 ,而记忆成分中工作记忆的作用可能尤为重要 .在该研究基础上 ,本研究以 1 72名 2 0～ 79岁成人为被试 ,进一步探讨了工作记忆在心算加工年老化过程中的作用 .结果表明 :(1 )工作记忆与年龄、工作记忆与心算难度、以及年龄、工作记忆和心算难度三因素间均存在明显的交互作用 ; (2 )工作记忆能力的高低对心算加工效率影响明显 ,高工作记忆能力组的心算效率约是低工作记忆能力组心算效率的 1 .32倍 ; (3)工作记忆对心算年老化的作用量约为 30 %～ 5 0 % .上述结果说明 ,工作记忆在心算加工年老化过程中起重要作用

成功的老年──近期老年学领域一个新的研究主题

“成功的老年”是近３０年来老年学领域提出的一个新的科学概念和模型．“成功的老年”是相对于“普通的老年”而言的，它不仅仅是寿命的延长，更重要的是通过生理因素和心理社会因素的积极作用，提高年老过程的生命质量。“成功的老年”可通过身心健康、认知功能、社会能力、生活满意度等多项指标来衡量。“成功的老年”在成为老年学领域一个重要的研究方向