Design of Communication Interface between MCUs Based on CPLD

介绍了AlTErA公司CPld器件EP1k30芯片的特点,利用MAX+PluS开发软件在EP1k30芯片上设计了一个三通道双向fIfO存储器阵列,实现了一个C8051f020单片机通过总线与其他3个C8051f020单片机的双向数据通信,用于一款嵌入式多路数据通信控制器的实时传输控制。The feature of the EP1K30 of ALTERA's CPLD is introduced.With the development software of MAX+plusⅡ,a three-way dual-direction FIFO memory array is designed on a EP1K30,one C8051F020 MCU can communicates with three other C8051F020 MCUs by BUS,it can be used for real-time transmission control of a built-in multi-way data communication controller

Separation of L-phenylalanine by Organic Solvent Extraction

以磷酸二(2-乙基己基)脂(D2EHPA)为萃取剂,环己烷为稀释剂萃取L-苯丙氨酸(L-Phe),研究了L-Phe浓度、D2EHPA浓度、温度对萃取分配系数D的影响,以及负载L-Phe有机相的反萃取特性.结果表明:萃取分配系数D随温度的升高而降低,而L-Phe浓度对分配系数的影响还与水相初始pH值有关;萃合物是以一个L-Phe分子和二个D2EHPA分子结合而成.在利用酸溶液对负载L-Phe有机相的反萃取过程中,反萃取的效果符合HCl>HNO3≥H2SO4>CH3COOH,且随HCl浓度和温度的升高而升高.The extraction of L-Phenylalanine(L-Phe) with di-(2-ethylhexyl)phosphoric acid(D2EHPA) as extractant and cyclohexane as diluent was studied.The factors that influence the L-Phe extraction process such as the concentration of L-Phe and D2EHPA,and the temperature,as well as back-extraction,were investigated.The results showed that the distribution coefficient decreased with increasing temperature and depended on the concentration of L-Phe and the initial pH value of aqueous phase.The study of the mechanism of the extraction process indicated that the extraction complex might be composed of one L-Phe molecule and two D2EHPA molecules.The effect of acids on the back-extraction process of L-Phe was proved to be HCl>HNO3≥H2SO4>CH3COOH,and the back-extraction ratio increased with increasing HCl concentration and temperature.厦门大学新世纪优秀人才支持计划(X07161)资

基于移动粒子半隐式法（MPS）电动汽车减速器最佳润滑油量分析

在分析某电动汽车减速器内元件的产热与传热过程的基础上，建立了基于AMEsim软件某电动汽车减速器热网络仿真模型，假设在充分润滑情况下，完成了高温高负荷不同车速工况条件下的减速器热平衡仿真。应用移动粒子半隐式法（MPS）分析了不同润滑油油量时减速箱的搅油流场，在此基础上，对减速器热网络模型中的对流换热热阻模块进行修正，分析得出减速器最佳润滑油油量。修正结果表明，电动汽车减速器在高温高负荷工况下，较少的润滑油油量会导致减速器齿轮系处于欠润滑状态，致使齿面温度较高。将热网络法与移动粒子半隐式法（MPS）相结合，为电动汽车减速器润滑效果分析提供了一种新方法

Preparation and Lithium Storage Performance of Sn-SnSb Nanoparticles

锂离子电池Sn负极材料有较高的比容量，但其容量随周期循环急剧衰减. 若Sn与Sb形成SnSb合金可以改善其循环性能. 本文采用有机液相还原方法制备了球形Sn-SnSb合金纳米粒子，其首周期循环充电容量1235.9 mAh·g-1，放电容量为785.9 mAh·g-1，经过50周的循环之后其放电容量保持在409.2 mAh·g-1，表现出较好的循环性能.Tin was widely studied as alternative anode material to carbon for lithium-ion batteries thanks to its much higher theoretical capacity. However, a pure tin electrode suffers severely from its poor cycleability due to mechanical fatigue caused by volume change during lithium insertion and extraction processes. Tin-based alloy may improve the cycleability property of tin electrode. In this article, we report facile synthesis of spherical Sn-SnSb nanopartciles using a simple solvent-thermal approach. It is amazing to find that the spherical Sn-SnSb nanoparticles can circumvent volume changes effectively during charge-discharge process. Electrochemical discharge/charge results show that the spherical Sn-SnSb nanoparticles electrode exhibits much better cycleability than pure Sn electrode, with first charge capacity and discharge capacity of 1235.9 and 785.9 mAh·g-1, respectively. After 50th cycling, the discharge capacity is 409.2 mAh·g-1.国家自然科学基金项目（No. 21273184）、科技部863计划项目（No. 2011AA11A254）和国家重点基础研究发展计划项目（No. 2009CB220102）项目资助作者联系地址：1. 厦门大学化学化工学院化学系，福建 厦门 361005；2. 厦门大学能源研究院，福建 厦门 361005Author's Address: 1. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005; 2. School of Energy Research, Xiamen University, Xiamen 361005通讯作者E-mail：[email protected]

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies