自动化散货装船机物位检测技术

为使散货装船机在安全作业的前提下自动、快速、高效地完成装船作业,利用安装在散货装船机上的激光雷达,通过多轴伺服运动机构控制激光雷达进行旋转,完成对船舱的三维轮廓扫描.通过后台截面边缘提取算法与图形拟合算法相结合的图像处理算法,自动、实时获取船舱尺寸以及舱内物料的形状,确定落料轨迹,为散货装船机的自动化作业提供基础.天津港煤码头的多次装船试验验证此方法的可行性.     

激光通信综合实验演示仪设计

为了演示激光通信技术的基本原理,介绍了一种激光通信综合实验演示仪的设计原理和工作方法.设计出双模式激光发射、光电转换、功率放大和带通滤波相结合的电路,接收光电探测器采集的激光信号,并还原信号实现解调.该实验仪性能稳定、操作方便,并实现了激光调制与通信演示实验的结合,在实际应用中取得了良好的教学效果.     

激光频率分裂与模竞争实验系统构建

与工厂合作,为研究生专业课"现代光学实验"开发出独创的半外腔型激光频率分裂与模竞争教学实验系统,在同一谐振腔中得到频差较大而偏振态正交的2组激光纵模输出,借助扫描干涉仪和数字示波器可观测和记录2组纵模的频率分裂特性和模竞争现象。研究生通过该实验可深刻理解激光器工作原理和纵模形成机制,并研讨利用激光频率分裂特性进行几何量和物理量的测量方法。     

稳功率氦氖激光器电源的研制

一种新型氦氖激光器电源以直流12V输入,并采用开关电源逆变、倍压整流等技术;摒弃了传统的大电阻恒流的方式,采用了负反馈电路控制电流,减少了功耗,且稳流精度高于2％;还增加了稳功率电路,稳功率精度可达3％以上。     

网络安全与防护的应用实例研究

近些年,网络技术发展迅速,而由网络导致的安全问题也日益突显,网络安全受到威胁,网络防护成了网络信息产业研究的重要课题。校园网面临的威胁主要来自内部破坏与外部攻击两个方面。加强网络安全可以从网络安全隔离、网络监控措施、网络安全漏洞、网络病毒的防范四个方面入手。     

激光成像雷达技术和系统研制

文章简述了激光成像雷达的原理和应用需求, 介绍了国外典型机载和星载激光成像雷达系统,分析了激光成像雷达的主要技术指标,结合不同体制激光成像雷达的分析,介绍了由上海技术物理研究所研发的各类激光成像雷达和部分应用结果。     

基于CO2激光加工机的木材雕刻工艺参数研究

对木质材料不同参数CO2激光雕刻效果进行了比较分析,找出毛边少、黑度小的木质材料最优雕刻工艺参数。实验测得木质三合板点射最小加工需要的能量阂值为2．52×10^4J／cm^2,最优雕刻工艺参数为：雕刻功率40w,雕刻速率400mm／s;雕刻功率12W,雕刻速率50mm／s。这为今后的实践操作提供了技术参考。     

Proteomic analysis of primary colon cancer-associated fibroblasts using the SELDI-ProteinChip platform

Objective: Cancer-associated fibroblasts (CAFs) are one of the hallmarks of the cancer microenvironment. Recent evidence has indicated that CAFs are more competent in enhancing cancer cell growth and migration than normal fibroblasts. However, the unique protein expression of CAFs has not been fully elucidated. This study aims to investigate the characterizations of colon CAFs by comparing the differential protein expression between CAFs and normal fibroblasts. Methods: Primary fibroblasts were isolated from surgical specimen of human colon cancer and matched normal colonic tissue. Purity of the cell population was verified through immunostain analysis. Total cell lysates and conditioned media from each group of cells were extracted, and protein expression analysis was conducted using the surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF-MS) ProteinChip platform. Results: Most primary cells showed typical fibroblast-like features after two weeks. Increased proportion of α-smooth muscle actin-positive myofibroblasts was detected within the CAFs in four of the six pairs of primary cells. Fibroblast activation protein was weakly expressed in most cells without differences. Using SELDI-TOF-MS ProteinChip platform, four protein peaks mass over charge ratio (m/z) 1142, 3011, 4035, and 4945 were detected in the total cell lysates, and two protein peaks m/z 1368 and 1389 were detected in the conditioned media. The potential candidate proteins found in the Swiss-Prot database include morphogenetic neuropeptides, FMRFamide-related peptides, insulin-like growth factor II, thymosin β-4-like protein 3, and tight junction-associated protein 1. Conclusions: Using the SELDI-ProteinChip platform, differential protein expressions were identified in colon CAFs compared with normal colonic stromal fibroblasts. The complex proteomic alternations in colon CAFs may play important roles related to the colon cancer microenvironment.     

浅谈高职院校激光加工实训教学

本文阐述了开展激光加工实训教学的必要性;结合高职教育的特点,介绍了实际教学当中的经验并对今后的发展作了总结。     

激光辐照单晶硅样品的研究

将功率为30W、波长为1064nm的YAG激光束(束斑直径0.045mm)照射在硅样品表面打出小孔,在孔内的侧壁上有很特殊的网孔状结构,其中的网孔壁厚为纳米尺度,解释孔侧壁网孔状结构的机理.孔侧壁上的网孔状结构有很强的受激荧光发光效应,发光峰中心约在700nm处.当样品在加工和检查过程中保持脱氧状态时,其样品几乎没有发光,证实了氧在PL发光增强上起着重要作用.我们用量子受限及其纳晶与氧化硅界面态复合的综合模型来解释其光致发光的增强机理