FPGA+DDS在激光扫描技术中的应用

针对单路激光扫描光绘机在12 000 DPI精度工作效率低下的缺陷,提出基于FPGA+DDS实现16路激光串行同步扫描的技术.该技术将高速FPGA器件与DDS芯片有机结合起来,原本扫描一个点时间215 ns,经过16路时分复用,在同样的时间内能够完成16个点的扫描.详细介绍了系统的工作原理、硬件设计和相应的软件实现,通过实验测量分析,该技术在高精度条件下,相对4路激光并行扫描光绘机,其工作效率提高了2～4倍.     

EH4音频大地电磁方法在辽东五龙金矿控矿构造及成矿预测研究中的应用

五龙金矿是辽东金矿集区最大的石英脉型金矿床,已累计探明金资源量大于80 t,作为一个开采多年的老矿山,当前面临着矿山资源储量严重不足的问题,亟需寻找深部隐伏资源。通过应用EH4音频大地电磁方法,在五龙金矿的东西两侧分别布设了100线、1000线和1050线3条EH4测量线,采用标量TM模式对原始测量数据进行收集并复核,经计算机处理后绘制出EH4二维反演剖面图。在EH4二维反演剖面图上成功识别出了分别位于矿区东西两侧的100^#断裂和鸡心沟断裂,其垂向延深均超过1 000 m。经过地质观察和坑道钻孔工程揭露,断裂带地表和浅部均存在着明显的金矿化,表明这些断裂在五龙金矿成矿过程中起着重要作用。将EH4音频大地电磁方法应用于五龙金矿控矿构造及成矿预测研究中,取得了良好的效果,矿区东、西部和深部均具有良好的找矿潜力,为矿区下一步地质找矿指明了方向。     

甘肃某金矿选矿试验研究

根据国内某金矿载体矿物的性质,进行了详细的选矿条件试验,获得了较优的工艺参数,最终确定了“一粗两精两扫,中矿顺序返还”的工艺流程。闭路试验结果表明：在磨矿细度为一0．074mm占70％的条件下,可获得产率2．89％、品位85．16g／t、回收率82．17％的金精矿。     

含氟铍矿石冶炼过程中氟的分离工艺研究

对含氟铍矿石冶炼过程中的氟分离工艺进行了研究。当矿石F/BeO=20%～40%时,采用沉淀分离法可以控制氢氧化铍的F/BeO=10%～12%。氢氧化铍经二次除铝、碱洗,可使产品中杂质Al2O3达到低于0 7%的要求。与矿石预处理工艺相比,沉淀法可使每吨氧化铍总成本降低约5000元左右。     

浇注过程的防下渣技术

消除汇流旋涡是防下渣技术开发的首要目标。已有的浇注过程防下渣方法大体可分为3类,即上躲、下藏与抑制。看来抑制法最为积极、有效,特别是用于中间包的名种控流、分渣双功能装置具有显著的综合优势;这类装置的逐步完善与普及,似乎是今后提高连铸水主要技术走向之一。     

Effect of rare earth addition on Cu-Fe/AC adsorbents for phosphine adsorption from yellow phosphorous tail gas

Phosphine(PH3) is a highly toxic air pollutant,commonly produced in phosphorous chemical industry.But it has received less research attention due to its handling difficultly.CO is the main content of the phosphorous chemical industry tail gas,the concentration of which is always more than 80 vol.%,and it can be the feed gas to produce various valuable products such as formate,oxalate,and methanol and so on.But,PH3 is one of the important barriers,which is harmful to the following chemical process.In order to make use of the tail gas,PH3 should be removed firstly,and CO should be covered in the whole purified procedure at the same time.In this work,the modified activated carbon(MAC) was used as the adsorbent to separate PH3 from the mixture tail gas.Series of MAC adsorbents were prepared for the adsorption of PH3,which loaded Cu-Fe and Ce(La),or separately.The PH3 adsorption capacities,chemical and physical properties of MAC were all investigated.The results showed that over 99% PH3 adsorption efficiency was achieved when used MAC adsorbents.The removal efficiency and PH3 adsorption capacity of the Cu-Fe-Ce/AC(20:1:0.4) were both much higher than those modified activated carbons.The maximum PH3 adsorption capacity was 71 mg of PH3/g of MAC on the Cu-Fe-Ce/AC,which were much higher than literature data using CuO only for adsorbing hydride gases.     

Re-determination of the crystal structure of Ca₂Y₈Si₆O₂₆ and study on the luminescent properties of Ca₂Y₈Si₆O₂₆:Tb³⁺

The crystal structure of silicate oxyapatite Ca2Y8Si6O26 was indexed as hexagonal,space group P63/m,a=0.93515 nm,c=0.67872 nm,α=β=90°,γ=120°,V=0.5138692 nm3.Three strong peaks located at 32.079o,32.595o,and 50.104o with d=2.7903,2.74649,1.8194 was in accordance with,(112),and(213) planes.The optimum concentration of Tb3+ in Ca2Y8Si6O26 to yield highest photoluminescence intensity was 10 mol.% of Y3+.The corresponding excitation spectrum consisted of an intense broad band from 220 to 260 nm.The photoluminescence measurements showed that the green emission originated from 5D4-7F5 was predominant in the measured range with strong doublet lines at 543 and 549 nm.     

AC型剩余电流动作断路器电子组件测试系统

针对剩余电流动作断路器电子组件生产检测中存在的自动化程度低、检测效率不高和精度低等问题,研究了交流可调触发电流发生技术及控制算法,设计了以ARM微控制器为核心的硬件电路,主要包括交流可调触发电流发生器、标准剩余电流互感器、工装夹具与传动控制单元、人机界面等部分,同时给出了系统软件及控制算法的设计流程图.测试数据表明:样机输出的交流可调触发电流最大示值误差为0.4％,具有自动测试、合格判断、数据存储、历史查询、通信等功能,满足了用户需求.     

在高职教学中JSP技术的课堂5个重要环节

经过多年的JSP技术课程的实践教学,总结出了一套行之有效的教学思路,把JSP技术课堂设计成为5个教学环节：励志教育、温故引新、情境教学、推行问题、教学检测这5部分能够兴趣化地向学生传授知识,教会学生结合实际勇于创新、勤于思考、积极实践。     

爆破后压入式通风独头巷道内氡的运移模型

为有效指导铀矿井下独头巷道的通风设计,基于质量守恒定律和置换通风理论,首先建立了描述爆破后压入式通风独头巷道内抛掷空间和风流末端氡活度浓度随通风时间变化的计算模型,利用该模型得到了达到氡活度浓度限值条件的最短排氡通风时间的确定方法;然后分析了不同参数对风流末端氡活度浓度以及最短排氡通风时间的影响。结果表明,爆破后,独头巷道风流末端氡活度浓度在一定通风时间内保持不变,之后瞬间增至峰值,最终逐渐衰减至稳定;在其他参数一定的情况下,风流末端氡活度浓度开始剧增的时间随巷道长度的增加而减小,随风量增加而增大;风流末端氡活度浓度衰减速率随风量的增加而增大;风流末端氡活度浓度峰值随掘进面铀品位的增加而增大;最短排氡通风时间随巷道长度和掘进面铀品位的增加而增大,随通风量的增加而减小。