基于FPGA和USB2.0的光电探测系统研究

自由空间光通信已引起广泛注意。在工业和科研等领域生产过程中探测光电信号,对探测信号数据处理要求也日益严格。本文提出以FPGA芯片EP2C5Q208C8为主控芯片,利用TLC5510进行多路的、同步的模数转换,对光电信号进行数据采集,从而实现较高精度的多路光电数据采集系统设计。通过软硬件编程,该系统可以实现8路、8位有效数据位光电信号采集,经FPGA处理和USB2.0通信完成光电探测数据采集显示功能。     

宝钢1550连退机组的三电系统设计

定钢三期冷轧１５５０连续退火机组的工艺和装备均具有世界一流水平，其三电控制系统主要采用日本三菱电气公司的最新产品构成。这里重点阐述三电系统设计中采用的多层次网络技术、分布式集散系统及ＥＩＣ一体化等最新技术。     

六辊冷连轧机张力超调成因的有限元分析

采用弹塑性大变形有限元法，从力学角度对六辊轧机的不同轧制工况进行了分析，通过考察各轧辊之间以及轧辊与轧件之间的摩擦力分布，找出了后两架轧机之间张力超调的原因，并采取了相应措施，使问题得到了解决。     

微机全数字直流控制系统及其在卸船机上的应用

微机全数字直流控制系统是一种全新的直流传动系统，它具有精度高、可靠性和稳定性好、维护简单及调试方便等优点。目前已在宝钢少数设备中得到应用。本文介绍美国Ｇ·Ｅ公司的ＤＦＭ－３００控制系统及其在原料码头二期１８００ｔ／ｈ卸船机上的应用，重点阐述卸船机抓斗的提升和开闭直流调速系统。     

VUV-excited luminescence properties of Tb3+ activated BaGdB9O16

The single phase of BaGd1-xTbxB9O16(0.05≤x≤0.3) was prepared by the solid-state reaction.Their photoluminescence properties were investigated under vacuum ultraviolet(VUV) excitation.Monitored by 541 nm emission,the excitation spectrum of BaGd0.75Tb0.25B9O16 consisted of one broad band centered at about 148 nm and some bands in 163 to 282 nm.The former was assigned to the overlapped absorptions among borate groups,charge transfer bands(CTBs) of O2-→Ln3+(Ln=Tb,Gd) and the f→d transition of Gd3+.The bands in ...     

冷连轧机带钢厚度控制及轧制方式的选择

我厂连轧机上的厚度控制环节是由计算机数字控制及模拟放大器共同组成的。本文综述了轧机上采用的各种厚度控制环节,重点讨论了G_4/G_5机架间张力的3种控制方式及它们与3种轧制方式之间的关系。对3种轧制方式作了简明比较并讨论其适用范围,可作为轧钢工正确选译轧制方式的参考。     

Luminescence of Eu^3 ＋ in LnAlO3 （Ln = Gd, Y） under UV and VUV Excitation

Single phases of LnAlO3 : Eu^3 ( Ln = Gd, Y ) were obtained by the process of evaporation of their nitric acid solution, and then pyrolysis of their nitrate salts. On monitoring by 613 nm emission, broad bands at around 270 and 170nm were observed in the excitation spectrum of Gd0.95Eu0.05AlO3. These peaks could be assigned to charge transfer (CT)transitions of Eu^3 -O^2- and Gd^3 -O^2- respectively. All the transitions observed in Gd0.95Eu0.05AlO3 are faithfully reproduced in the Y0.95Eu0.05AlO3, but with an exception of the ^8S7/2→^6I11/2 transition of Gd^3 . The 153 nm broad band could be the CT transition of Y^3 -O^2 - . Accordingly, the efficiency luminescence of (Gd, Y) BO3 : Eu^3 was explained as a result of CT transitions of Gd^3 -O^2- and Y^3 -O^2- under 147 nm excitation. Under VUV excitation, Gd0.95Eu0.05AlO3 exhibits a bright red luminescence with CIE chromaticity coordinates of (0.623, 0. 335) with a PL intensity of 30 of the commercial phosphor (Gd, Y) BO3 : Eu^3 (KX-504A). The PL spectrum of Y0.95Eu0.05AlO3 is similar to that of Gd0.95Eu0.05AlO3. Calculation of the color coordinates gives x = 0. 636, y = 0. 340 with a PL intensity of 50 of the (Gd, Y) BO3 : Eu^3 ( KX-504A) for Y0.95Eu0.05AlO3, and confirms that it has the appearance of pure spectral red, corresponding approximately to 608 nm. It can be concluded that LnAlO3:Eu^3 is a promising red VUV phosphor.     

络合法制备钛酸铝陶瓷粉料的研究

本文应用DTA-TG-DTG、XRD、TEM和BET等测试手段,研究了高熔点、低热膨胀系数钛酸铝结构陶瓷粉料的湿化制备;确定了制备粉料的最佳工艺条件,为制备低膨胀、一定强度的钛酸铝陶瓷提供非传统制备工艺技术。     

Vacuum ultraviolet excited photoluminescence properties of Gd2O2CO3：Eu^3＋ phosphor

The Gd2O2CO3：Eu^3＋ with type-Ⅱ structure phosphor was successfully synthesized via flux method at 400 ℃ and their photoluminescence properties in vacuum ultraviolet （VUV） region were examined. The broad and strong excitation bands in the range of 153-205 nm owing to the CO3^2- host absorption and charge transfer （CT） of Gd^3＋-O2^- were observed for Gd2O2CO3：Eu^3＋. Under 172 nm excitation, Gd2O2CO3：Eu^3＋ exhibited strong red emission with good color purity, indicating Eu^3＋ ions located at low symmetry sites and the chromaticity coordination of luminescence for Gd2O2CO3：Eu^3＋ was （x=0.652, y=0.345）. The photoluminescence quenching concentration of Eu^3＋ excited by 172 nm for Gd2O2CO3：Eu^3＋ was about 5%. Gd2O2CO3：Eu^3＋ would be a potential VUV-excited red phosphor applied in mercury-free fluorescent lamps.