天水盆地古近纪地层年代及其意义

天水盆地位于青藏高原东北缘六盘山与西秦岭二重要构造带交汇处,该盆地充填的新生代沉积序列记录着该区构造变形历史,因此研究该盆地沉积记录对探讨青藏高原东北缘新生代构造活动事件具有重要意义.通过对天水盆地古近纪砾石层砂质透镜体中碎屑颗粒磷灰石裂变径迹热年代学研究,获得样品地层的最大沉积年龄为24.8士1.5 Ma.结合前人的工作,厘定该套古近纪地层最顶部地层年龄为22～24.8 Ma,并确定天水盆地古近纪沉积物源区在24.8 Ma左右发生了构造冷却事件,推断印度板块与欧亚大陆碰撞的远程效应在古近纪末-新近纪初已传递到青藏高原的最东北缘.     

重核径迹宽度的程控测量

本文介绍了测量在原子核乳胶中重核径迹宽度的新方法,它是借助电视摄象卡及VIDEO—TELEX 图象处理卡对重核径迹的黑度进行灰度等级分析,从而测量核径迹宽度.测量结果同利用 MD—100显微密度计测量结果进行了比较,在实验误差范围内,二者是一致的。     

对4J42合金蚀刻问题的初步研究

本文通过对４Ｊ４２合金在喷淋条件下的失重腐蚀实验进行研究，结果表明：腐蚀速度随ＦｅＣｌ３Ｂｅ°的提高而降低，随温度升高而增加，随盐酸浓度的增加而降低在喷淋条件下的标准板实验和金相观察结果表明：腐蚀速度越快，蚀刻因子越大     

商标蚀刻工艺关键问题探讨

本文综述了蚀刻阴极阳极材料，蚀刻面积，溶液搅拌对不锈钢刀具产品蚀刻商标效果的影响，分析了提高蚀刻商标清晰度的因素，达到蚀刻商标清晰深刻、完整美观的良好效果。     

用核裂变径迹法和热释光法研究瘦狗岭断裂活动年代

用核裂变径迹法和热释光法测定广州市郊瘦狗岭的断裂活动年代．结果表明：广州瘦狗岭断裂在中新代是处在较大规模较强烈的活动时期，而在第四纪早更新世及中更新世仍发生过较强烈的活动．最新的断裂活动是在４３×１０４ａ前．两种方法的数据可以互相印证     

闽西南里田推覆构造带锆石和磷灰石的裂变径迹分析

闽西南若干鲜明的地质证据表明,里田地区存在较深层次的韧性推覆构造并产生了剪切重熔的花岗岩.推覆造山作用结束以后,必然伴随岩石圈的热松弛(thermal relaxation),造成推覆带的冷却与抬升.由于不同矿物的裂变径迹具有不同的封闭温度,锆石和磷灰石的裂变径迹封     

Acid etching process for fabrication of Bi2Sr2CaCu2O8＋x stack

We adopted a new method, acid etching process, to fabricate the intrinsic Josephson junctions based on the Bi2Sr2CaCu2O8 x single crystals. By soaking the crystals into the dilute hydrochloric acid, we fabricated a junction stack successfully, and meantime made the surrounding area insulated. A certain concentration of hydrochloric acid was used to maintain the roughness of the modified layer. The cur-rent-voltage characteristic was achieved through the four terminal measurement. We could control the junctions' number by changing the concentration and the soaking time. We also found that the thick-ness of the stack was equal to the average height of the insulation layer. Such a simple, convenient and controllable fabrication method with a high yield might widen the applications of the intrinsic Joseph-son junctions.     

The research and progress of micro-fabrication technologies of two-dimensional photonic crystal

The novel material of photonic crystal makes it possible to control a photon, and the photonic integration will have breakthrough progress due to the application of photonic crystal. It is based on the photonic crystal device that the photonic crystal integration could be realized. Therefore, we should first investigate photonic crystal devices based on the active and the passive semiconductor materials, which may have great potential application in photonic integration. The most practical and important method to fabricate two-dimensional photonic crystal is the micro-manufacture method. In this paper, we summarize and evaluate the fabrication methods of two-dimensional photonic crystal in near-infrared region, including electron beam lithography, selection of mask, dry etching, and some works of ours. This will be beneficial to the study of the photonic crystal in China.     

Feasibility of probing solid state nuclear tracks by thermal analysis method

The feasibility of probing solid state nuclear tracks by thermal analysis method is discussed both theoretically and experimentally.Comparison is made between the thermal analysis method and the optical microscope method,and it is demonstrated that this thermal analysis method is applicable to probing solid state nuclear tracks.