11 research outputs found
XPS Analysis of the HgCdTe Surface Etched by ICP
文章将ICP刻蚀技术应用于刻蚀HgCdTe,使用微区X射线光电子光谱学(XPS)、扫描电子显微镜(SEM)等表面分析技术研究了ICP各工艺参数,包括ICP功率、气体成分与配比、腔体压力等对刻蚀表面形貌、刻蚀后表面成分、聚合物形成的影响。XPS分析结果发现,使用光刻胶作掩模时,刻蚀气体CH4会与光刻胶发生反应,生成物可能为C6H5(CH3)。如果腔体压力较高,生成物不能及时被带走,就会附着在样品表面上,使样品表面发黑;当腔体压力较低时,生成物被及时带走,则样品表面光亮,无聚合物残留。光刻胶也会与H2发生反应,生成多种含C有机物。SiO2作掩模时,在一定的条件下,CH4会与SiO2或者真空硅脂发生反应,生成聚脂薄膜。ICP(Inductively Coupled Plasma) etching technique has been applied to HgCdTe providing significant benefits such as high uniformity, low damage and anisotropic profile,etc.We have studied the dependence of surface profile,post-etch composition,formation of polymer on the effect of ICP parameters(ICP power,gas ratio,chamber pressure) by using micro regional XPS and SEM(scanning electron microscopy).We have found that methane can react with photoresist(PR) which is used as mask,the product may be C_6H_5(CH_3).The product can't be pumped out if the chamber pressure is high,then it will be left on the sample surface forming so-called polymer.Otherwise if the chamber pressure is low,the product is pumped away the chamber in time,and there is no polymer on the surface.H_2 can react with PR,and the products are several organic compounds with carbon.Under certain condition,methane can reacts with SiO_2 or high vacuum grease,generating Mylar Polyster
A Data Acquisition System Used in Offshore Platform Based on CAN Bus
介绍了一种基于CAN总线的数据采集系统,讨论了该系统应用在海洋平台这类特殊环境下的系统结构和现场节点的具体设计。系统由上位监控机、CAN网卡、智能网桥节点和智能采集节点组成,采用总线方式的网络拓扑结构,构成一种基于CAN总线的分布式监控采集系统。智能节点以AT89S52单片机为微控制器,使用SJA1000作为CAN控制器,可构成上行和下行网络通信波特率分别为500kbps和250kbps的CAN网络。详细分析了该系统的硬件组成,应用层协议和通讯流程。系统已应用于某海上平台的环境载荷的监测,提高了数据传输的可靠性,为平台的安全运行和结构的优化设计提供了科学依据
Association of dynamic functional connectivity with bilateral precuneus at resting-state with obsessive-compulsive disorder
目的:探讨强迫症患者在静息状态下双侧楔前叶动态功能连接(dynamic functional connectivity,dFC)的模式。方法:对符合ICD-10诊断标准的50例强迫症患者(患者组)和50名健康对照者(对照组)进行全脑静息态功能磁共振成像(functional magnetic resonance imaging,fMRI)扫描。采用基于全脑体素的dFC分析强迫症患者静息状态下双侧楔前叶dFC模式;采用皮尔逊相关分析方法,探讨强迫症患者异常dFC值与临床症状之间的关系;采用支持向量机分析方法,探索异常的dFC值是否可以用于识别强迫症。结果:与健康对照组比较,患者组左侧楔前叶与左侧内侧前额叶皮质(0.23±0.02与0.26±0.03, t=-6.23, P<0.05,GRF校正)、左侧楔叶(0.24±0.03与0.28±0.04, t =-5.30, P<0.05,GRF校正)、左侧中央旁小叶(0.23±0.03与0.27±0.04, t =-5.36, P<0.05,GRF校正)dFC值降低,右侧楔前叶与左侧中央后回(0.23±0.04与0.27±0.04, t =-5.12, P<0.05,GRF校正)dFC值降低;患者组降低的左侧楔前叶与左侧内侧前额叶皮质dFC值( r=0.289, P<0.05,未校正)与Y-BOCS总分呈正相关,降低的右侧楔前叶与左侧中央后回dFC值与Y-BOCS总分( r=0.292, P<0.05,未校正)、强迫思维因子分( r=0.304, P<0.05,未校正)呈正相关;降低的右侧楔前叶与左侧中央后回dFC值的受试者操作特征曲线的曲线下面积为0.856,约登指数为0.52,敏感度为100%,特异度为52%。 结论:静息状态下,强迫症患者双侧楔前叶dFC降低;降低的右侧楔前叶与左侧中央后回dFC值可能对于强迫症的识别有提示作用。</p
Advancement in Time Synchronization Technology Using Bi-Contrast Methods in Optical Fiber
Self-assembled Monolayer of Schiff Bases on Au electrode
本文利用自组装技术 ,首次将带有巯基的Schiff碱自组装到Au电极的表面 ;并利用扫描电子的显微电镜 (SEM )直接证实了Schiff碱的成膜 ,用循环伏安和交流阻抗技术对其膜的致密性等进行了分析 ,证实由Schiff碱形成的膜虽较疏松 ,但对异相电子转移起到了一定的抑制作用 ,本工作为利用自组装膜的方法研究Schiff碱提供了必要的实验理论参考Schiff bases tailored with _SH group,was self_assembled on Au substrate for the first time.The packing degree of this monolayer was described with SEM technique.Spontaneously,the self_assembled monolayer (SAM) was briefly characterized with CV and EIS methods.Though Comparing with the SAM of alkanethiol,the membrane we fabricated was relatively loose,our work is the first step to study Schiff bases by means of self_assembled monolayer.作者联系地址:河北师范大学化学系,河北师范大学化学系,河北师范大学化学系,河北师范大学化学系,河北师范大学化学系,河北师范大学化学系,中国科学院山西煤炭化学研究所,首都师范大学化学系 河北石家庄050016中国科学院山西煤炭化学研究所,山西太原030001 ,河北石家庄050016 ,河北石家庄05Author's Address: 1.Dept. of Chem. Hebei Teacher's Univ., Shijiazhuang 050016,China;2.Inst. of Coal Chem. Chinese Academy of Sci., Tai
新疆塔里木河流域治理下坂地水库工程近坝区高陡边坡稳定性研究
工作内容主要有:近坝库区滑坡稳定性研究、未来可能破坏模式分析,滑坡在多种不利组合条件作用下的稳定性计算评价、滑坡工程处理措施研究等;坝区高陡边坡变形与稳定性研究,包括高陡边坡形态特征与岸坡结构类型研究;边坡变形的数值模拟研究;边坡稳定性的计算评价;边坡工程处理方法研究;泄水隧洞进出口边坡、引水发电洞进口、地下厂房后高陡边坡变形与稳定性研究,包括这些边坡变形特征与变形破坏模式研究;边坡变形3维数值分析、刚体极限平衡法分析。边坡的地震稳定性研究、地下厂房对高陡边坡变形与稳定性影响的数值计算分析、边坡加固措施研究。在逐渐完善的勘察和现场测试工作基础上,本报告提出的地质依据可以满足高边坡稳定性研究的要求
绿洲农业高效用水技术集成与示范
简要技术说明: 该成果围绕棉花、葡萄、小麦3大作物,从干旱绿洲区作物高效用水和提高作物水分生产效率的目标出发,研究形成了棉花高效用水技术模式3套、葡萄高效用水技术模式1套、小麦优化灌溉节水及配套栽培技术模式1套、干旱绿洲区农业高效用水管理技术模式1套,开发了15项农业节水关键技术和1套“农业灌溉决策支持系统”,筛选出节水配套抗旱小麦品种2个、抗旱棉花品种1个,制定了农业高效用水技术规程7项,研发了专利产品1项、软件著作权登记1项,人才培养12名、发表论文45篇。通过对高效灌溉技术、农艺高效用水技术、高效用水管理技术等3方面的关键技术的集成与创新,研究形成了干旱绿洲区特色作物(棉花、葡萄、..
JUNO Sensitivity on Proton Decay 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 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 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 years, competitive with the current best limits on the proton lifetime in this channel