SRS3D立体声音响控制器M62437FP及其应用

M6237FP是带SRS环绕和SRS聚焦的3D立体声音响控制器IC。可为汽车电子音响系统进行高质量的3维立体声音响控制。本文介绍了M62437FP的性能参数和工作原理。同时给出了它的几种应用电路。     

斩波型脉宽调制器HA16114FP应用心得

HA16114FP是单通道PWM开关稳压器集成控制器,其输出形式是为使用一个P沟道功率MOS场效应管而设计的。使用该芯片设计的降压器,电路结构简单紧凑,外围元器件少,工作稳定可靠程度高,功耗低,因此特别适合用于制作斩波型直流降压器。     

基于PLC的稠油开采防堵预警系统

针对稠油开采过程中易出现的井堵问题,结合空心杆掺水稠油开采工艺,将实时注水流量作为井堵判断依据,基于PLC和单片机开发出经济型防堵预警系统.根据所选流量计脉冲输出信号宽度为4ms而周期较长的特点设计展宽电路,利用普通I/O口实现高速脉冲计数功能;PLC根据实测瞬时流量与设定流量下限阈值的比较,自动判断井况;基于单片机利...     

FP-DN型烟气脱硝剂在催化裂化装置中的应用

采用加入FP-DN型烟气脱硝剂的方法,降低了中海油惠州炼化分公司120万t/a重油催化裂化装置NOx与SO2的排放量,使得烟气排放达到广东省DB 4427—2001标准要求。工业应用表明,加剂前烟气中SO2和NOx平均质量浓度分别为251.68,511.00 mg/m3,在脱硝剂加入量为15 kg/d的平稳期,二者分别降至29.10,74.85 mg/m3,即脱硫率达到88.4%,脱氮率达到85.4%。加入脱硝剂后,干气、液化气、油浆和焦炭收率依次提高了0.28,1.30,0.08,0.26个百分点,汽油和柴油收率分别下降0.65,1.27个百分点。此外,转化率由75.71%增至76.90%。加入脱硝剂后,液相产品中硫、氮含量均有所上升,产品其他性质基本稳定。脱硝剂对干气的组成影响不大;加剂后,液化气中丙烷和丙烯体积分数分别上升1.25,0.89个百分点,丁烯体积分数下降1.98个百分点。     

Co‐administration of Antimicrobial Peptides Enhances Toll‐like Receptor 4 Antagonist Activity of a Synthetic Glycolipid

This study examines the effect of co‐administration of antimicrobial peptides and the synthetic glycolipid FP7, which is active in inhibiting inflammatory cytokine production caused by TLR4 activation and signaling. The co‐administration of two lipopolysaccharide (LPS)‐neutralizing peptides (a cecropin A–melittin hybrid peptide and a human cathelicidin) enhances by an order of magnitude the potency of FP7 in blocking the TLR4 signal. Interestingly, this is not an additional effect of LPS neutralization by peptides, because it also occurs if cells are stimulated by the plant lectin phytohemagglutinin, a non‐LPS TLR4 agonist. Our data suggest a dual mechanism of action for the peptides, not exclusively based on LPS binding and neutralization, but also on a direct effect on the LPS‐binding proteins of the TLR4 receptor complex. NMR experiments in solution show that peptide addition changes the aggregation state of FP7, promoting the formation of larger micelles. These results suggest a relationship between the aggregation state of lipid A‐like ligands and the type and intensity of the TLR4 response.     

气动机械手的自动控制和上位机监控设计

采用松下FP1-C40型PLC为控制器,以组态王软件为上位机开发平台。通过分析控制动作流程,完成PLC程序设计,实现了气动机械手将不同颜色的物块搬运到指定位置。通过组态软件设计系统图形界面,定义I/O设备,构造数据库,建立动画连接及联机调试,实现了上位机对系统的实时监控。控制安全可靠,监控界面友好。     

基于磁流体磁体积效应的磁场与温度双参量传感器

为了实现磁场与温度的同时测量,提出并制作了一种基于磁流体(magnetic fluid, MF)磁体积效应的法布里-珀罗(Fabry-Perot, FP)腔与光纤布拉格光栅(fiber Bragg grating, FBG)级联的复合传感结构。注入空芯光纤(hollow-core fiber, HF)的MF液面与单模光纤端面形成的FP腔同时对磁场和温度敏感,与之级联的FBG只对温度敏感。通过同时监测FP腔特征峰与FBG布拉格反射峰的波长漂移,利用传感器磁场与温度敏感系数矩阵,同时获取温度与磁场信息。实验成功制备了初始腔长为56.1μm的FBG-FP温度磁场双参量传感器,磁场与温度灵敏度分别达到了16.21 pm/Oe和9.96 pm/℃,具有体积微小、结构简单、成本低等特点。该传感器可解决常规光纤磁场传感器的磁场-温度交叉敏感问题。     

Dual‐polarized low sidelobe Fabry‐Perot antenna using tapered partially reflective surface

A novel dual‐polarized Fabry‐Perot (FP) cavity antenna with low sidelobes is proposed. Low sidelobes are obtained by using a tapered partially reflective surface (PRS) in the form of circular lattice instead of the conventional rectangular lattice. As the PRS can be regarded as a 2D leaky wave surface on which cylindrical waves propagate outward radially in the form of concentric rings, so arranging the PRS elements in the form of circular lattice and then applying tapering on it yields low sidelobes in both the E‐ and H‐planes. The performance of the proposed PRS is validated by fabricating a dual‐polarized FP antenna and measuring its radiation patterns. Peak realized gains of 18.6 and 18.5 dBi are obtained for horizontal and vertical polarizations respectively, giving an aperture efficiency of around 42%. Measured sidelobe levels are reduced to lower than ?21.3 dB in both the E‐ and H‐planes for the two orthogonal polarizations.     

一种改进的多层关联规则挖掘算法

在传统的多层关联挖掘算法中,概念层次树只提供项目的概念分层信息,导致项目查找效率不高。为此,提出一种改进的多层关联规则挖掘算法。在概念层次树的节点中增加2个域,以获取各层的频繁1-项集,通过增加1个基于Hash表的辅助存储结构,以提高项目的查找效率。实验结果表明,与传统算法相比,改进算法的挖掘时间能缩短10%左右。     

以EDFA为光源的光纤Fabry-Perot腔位移传感

提出了一种新颖的光纤位移传感测量方法,采用空芯石英光纤内置单模光纤的方法制作了腔长可随待测目标移动而变化的非本征型光纤法布里-珀罗(FP)腔,利用EDFA光源的宽带光照射FP腔,其形成的多光束干涉谱通过多峰检测法,反算光纤FP腔的绝对腔长,实现对微小位移量的精确测量.根据所设计的方案,搭建了相应的光纤FP腔位移传感系统,实现了11 mm长度范围内1μm位移分辨率、40.4 dB动态范围的位移传感.