酸刻蚀处理对Si(100)和Si(111)上制备CVD金刚石膜的影响

对Si(100)和Si(111)采用相同的酸刻蚀工艺,采用热丝化学气相沉积法(HFCVD)制备金刚石膜.用扫描电子显微镜、X线衍射仪和X线应力测试仪对样品的形貌、织构及残余应力进行检测、分析.研究结果表明:沉积3 h后,Si(100)和Si(111)基体上均生长出晶形比较完整,呈柱状晶方式生长的金刚石薄膜;此外,Si(100)金刚石膜表面分布着大量的微孔,通过调整沉积工艺可控制微孔的数量和尺寸,而Si(111)金刚石膜表面无微孔出现;2种基体所得薄膜都存在(111)织构,后者Si(111)还有一定的(110)织构;2种基体经酸刻蚀之后制得薄膜均无鼓泡剥离现象,二者的残余应力相差不大.     

山东乳山西泊金矿床构造特征研究与深部找矿预测

通过西泊金矿床构造特征及控矿规律研究，表明金矿体严格受断裂带控制，主构造以左行压扭性为主，具有多次活动特点。矿体富矿段佣伏方向由南东变为北东，佣伏角由陡变缓，沿走向及倾向具有尖灭再现，右行佣列特点，I-1号矿体向北东方向佣伏是找矿有利靶区。     

Language Context and English Teaching

Improvisation or transfer is the core of a course,based on the communicative approach. That is,the students are required to transfer what they learned in the textbook to real-life situation as far as possible. And in the present-day textbook of Middle School, the courses are organized in authentic everyday situations in which students can easily identify. So in the process of English teaching,it is very important for the teachers to set the language contexts correctly and flexibly.