基于GE Fanuc的MPS模块化生产制造系统设计

MPS系统是一种高生产率和可重构的生产制造系统,是时代发展的潮流。利用MPS系统的特点,选用GE Fanuc控制器对其进行进一步的改造。首先分析介绍MPS系统的结构设计及系统组成,并给出系统组成图;然后阐述所构成的各个工作单元的控制功能,并给出相应的程序流程图;最后以加工单元为例,根据给出的I/O分配表编写梯形图程序。运行结果表明,基于GE Fanuc的MPS系统具有较好的可行性,有很大的实际应用意义。     

Nano-porous Si/C composites for anode material of lithium-ion batteries

Nano-porous silicon composite incorporated with graphite and pyrolyzed carbon was synthesized and investigated as a promising anode material for lithium-ion batteries. The nano-porous Si/graphite composite was prepared via two-step ball-milling followed by etching process. Then carbon was incorporated by using different approaches. The nano-porous Si/graphite/C composite exhibits a reversible capacity of about 700 mAh/g with no capacity loss up to the 120th cycle at a constant current density of 0.2 mA/cm². The superior electrochemical characteristics are attributed to the nanosized pores in Si particles, which suppress the volume effect, and buffering action as well as excellent electronic and ionic conductivity of carbon materials.     

Stable Na Metal Anode Enabled by a Reinforced Multistructural SEI Layer

Metallic sodium (Na) is one of the most promising anode candidates for next‐generation secondary batteries. The development of Na metal batteries with a high energy density and low cost is desirable to meet the requirements of both portable and stationary electrical energy storage. Unfortunately, several problems caused by the unstable Na metal anode severely hinder the practical applications of these batteries. Here reported is a facile but effective methodology to form a multistructural interphase layer containing a sodium fluoride‐rich solid electrolyte interphase (SEI) and crisscrossed Na₃Sb bars on the Na electrode surface. The reinforced Na‐alloy network and chemically/electrochemically complementary SEI formation greatly improve the interphase strength and Na⁺ conductivity. The well‐protected Na metal electrode in symmetric Na|Na cells is stable and dendrite‐free in the plating and stripping cycling processes with a negligible voltage divergence, even at a large current density of 5 mA cm^?2 or with a high deposition capacity of 10 mAh cm^?2. Moreover, this anode is especially compatible with different cathodes and demonstrates outstanding cycle performance in the full cells. It is believed that this approach provides a practical solution toward stable Na metal anodes and related battery systems.     

Submicro-sized LiMn2O4 prepared by a sol–gel, spray-drying method

Submicro-sized LiMn₂O₄ powders were produced by a sol–gel, spray-drying method in which a brown gel precursor was prepared via the reaction of LiOH alkaline solution with 1 M Mn(CH₃COO)₂. The gel precursor was then transferred into a dry precursor powder via a spray-dry process. After heating treatment the spinel LiMn₂O₄ powder was obtained. The composition and the crystal size of the samples were strongly affected by the spray speed in the drying process and the heating temperature. The structure and the morphology of LiMn₂O₄ powder were investigated by DTA, TGA, IR, XRD and SEM methods. It was discovered that submicro-sized LiMn₂O₄ powder could be formed under the conditions of rotating spray speed of 15 000 rpm and syntheses temperature of 700 °C. The electrochemical properties of LiMn₂O₄ samples in 1 M LiPF₆, EC:DMC = 1:1 solution were tested by measuring the voltammograms and charge–discharge curves. The submicro-sized LiMn₂O₄ sample made at 700 °C has a capacity of 128 mAh g^–1 and good cycle stability for Li⁺ intercalation reaction. This method may be applied to the industrial-scale production of superfine LiMn₂O₄ powder for use in lithium ion batteries.     

基于Delplli的称重控制器上位机软件设计与实现

介绍了在Windows环境下利用Del-phi7.0开发的称重控制器上位机软件设计与实现,包括上位机和PLC通信的设计,上位机监控软件的总体设计、数据库设计、模块设计等,完成了对称重控制器的状态监视、通讯设置、参数设置、料种设置、生成报表、显示实时曲线、历史曲线等功能.实验表明该软件使用方便、调节灵活、可移植性强,很好地实现了称重控制器的人机交互功能,实践证明该设计方法是有效的.     

1DTOCSY在确定化合物结构中的应用

本文主要是对核磁共振一维全相关实验 (1DTOCSY)在化合物结构解析中的应用进行探讨。 1DTOCSY作为NMR中一种比较新的一维实验技术 ,为糖类等化合物的结构解析带来极大的便捷 ,具有时间短、信息清晰的特点。本文以蔗糖和乙酸戊脂为样本 ,对 1DTOCSY实验中整形脉冲的选择 ,实验参数的设置进行研究 ,并尝试建立起一种利用改变混合时间辅助完成特定化合物精细结构解析的方法。     

4,4-二氨基二苯乙烯-2,2-二磺酸改性水性聚氨酯的制备及性能研究

以异佛尔酮二异氰酸酯（IPDI）及聚己内酯二元醇（PCL1000）为主要原料,二羟甲基丙酸（DMPA）为亲水扩链剂,制得一系列水性聚氨酯预聚体。利用4,4-二氨基二苯乙烯-2,2-二磺酸（DSD酸）作为扩链剂进行改性,得到荧光水性聚氨酯（SWPU）。采用FTIR、DLS、XRD、UV-vis、荧光光谱、力学性能、热重分析等手段对聚氨酯进行了结构表征与性能测试。FT-IR、DLS分析表明,4,4-二氨基二苯乙烯-2,2-二磺酸（DSD酸）已引入到聚氨酯分子链中,随着DSD酸质量分数的增加,乳液粒径先减小后增大,当w（DSD酸）%=2%时,SWPU乳液的平均粒径适中(72.80 nm)。XRD、UV-vis、荧光光谱结果表明,SWPU具有明显结晶性;SWPU具有一定的紫外吸收且发生了红移;SWPU发出较强的蓝色荧光且发生浓度猝灭。与WPU相比,SWPU的力学性能及热稳定性明显提高,当w（DSD酸）%=3%时,最大拉伸强度为48.43 Mpa,断裂伸长率为366.42%;最大分解温度由301.48 ℃提高到328.05 ℃。     

液压自动挂脱梁在官厅水库溢洪道台车式启闭机改造中的应用

为提高官厅水库溢洪道检修闸门启闭效率,消除安全隐患,对台车式启闭机进行整体更新,并增加工作扬程,增设液压自动挂脱梁.介绍了液压自动挂脱梁运行原理和调试要求,并对启闭机改造前后的运行效果进行对比分析,提出了运行管理方面的相关建议.结果表明改造后检修闸门启闭控制简单,提高了工作效率和安全可靠性,保障了官厅水库的安全运行.改造成果可为类似工程金属结构改造提供参考.     

Sm3+/Ho3+掺杂Lu3Al5O12基荧光粉的制备与发光性能研究

采用高温固相法制备了Sm3+/Ho3+掺杂Lu3Al5O12基荧光粉。XRD结果显示：所合成的荧光粉具有单一相石榴石结构。荧光光谱分析表明,在蓝光激发下,Lu3Al5O12：Sm3+样品的发射光谱的峰值波长为568nm和614nm,Sm3+的最佳掺杂摩尔分数为6.3%;Lu3Al5O12：Ho3+发射光谱峰值波长为549nm,Ho3+样品的最佳掺杂摩尔分数为4%。在Sm3+、Ho3+共掺Lu3Al5O12：Sm3+,Ho3+荧光粉中,Sm3+、Ho3+均为发光中心,样品的发射光谱中同时出现单掺Sm3+、Ho3+的特征发射峰。可见,Lu3Al5O12：Sm3+,Ho3+可用作暖白光LED用荧光粉。     

现场连续油管对接全位置自动焊技术探讨

对比分析了目前连续油管现场管-管对接焊的几种焊接方法,研究认为采用全位置自动TIG焊可满足现场连续油管的焊接要求,并能获得质量可靠、性能稳定的焊接接头,解决了现场连续油管的损坏修复等问题。