Field Emission from Silicon Nanocrystallite Films with Compact Alignment and Uniform Orientation

Patterned silicon nanocrystallite (SINC) films were fabricated on (100) orientation p-type boron-doped sificon wafer by the hydrogen ion implantation technique and the anodic etching method. The efficient field emission with low turn-on field of about 3.5V/μm at current density of 0.1μA/cm^2 was obtained. The emission current density from the SiNC films reached 1mA/cm^2 under a bias field of about 9.1V/μm. The experimental results demonstrate that there are great potential applications of the SiNC films for fiat panel displays. A surface treatment with hydrogen plasma was performed on the SiNC films and a significant improvement of emission properties was achieved.     

β缓发中子探测阵列的性能优化及测试

讲述了用于β缓发中子发射测量的中子探测阵列的性能优化过程及测试结果. 对中子探测器包装用的几种反射材料、光导和光电倍增管之间用的几种耦合材料行了系统的对比和研究. 为了优化电子学和实时监测整个探测阵列的工作状态, 引入了LED光纤刻度监测系统.     

不含稀土元素的高温超导体

氧化物高温超导材料La2-xMxCuO4-y(M为Ba,Sr或Ca)和ReBa3Cu3O7-y或大部分稀土元素)的发现,是超导电性研究的一个重要的里程碑.这类材料晶体结构的特点是含有二维Cu-O2平面层,人们认为高温超导电性与此密切相关.因此,晶体结构中含有这种Cu-O2平面层的新材料可望是高温超导体.最近,人们用Bi或T1替代上面两类材料中的稀土元素,合成出了新的稳定的高温超导材料,从而在这个以Cu-O2平面层为结构特征的高温超导家族中又添加了新的成员. 1987年五月,法国Caen大学的C.Michel和B.Raveau等人报道了他们的发现[1]:在接近Bi2Si2Sr2Cu2O7 y成…     

用等离子体治疗牙病

等离子体清洗经常使用在材料处理和半导体工业上，虽然等离子体也可以快速地消灭细菌，但由于它们都处于高温状态，所以一直无法应用到生物医学领域．三年前，荷兰Eindhoven大学的一些物理学家发展了一种可在室温下工作的“等离子体针”。     

聚乳酸类医用生物降解材料的研究进展

聚乳酸由于其突出的优点如生物相容性好、降解产物对人体无毒而倍受重视,并且在生物医学领域的应用中获得了很好的效果。本文对聚乳酸的合成及在医学方面的应用作了总结和评述,并对其在生物医学领域的应用前景作了进一步展望。     

微脉冲电子枪的初步实验研究

给出了微脉冲电子枪的模拟计算及其初步实验结果. 该电子枪采用铜铝镁合金作为冷阴极材料, 在以磁控管作为微波功率源的出束实验中得到了100mA/cm²的电流密度.实验结果与次级电子倍增解析计算和SEEG程序的模拟计算结果基本符合, 初步验证了微脉冲电子枪的基本原理, 为今后实验中得到更大的电流密度打下了基础.     

Field Quantization and Spontaneous Emission in Left-handed Material

Recently, research on left-handed materials （LHMs） has attracted considerable attentions. The LHMs are a kind of man-made metameterials which have negative permittivity and negative permeability. These metameterials have many novel properties such as inverse light pressure, and reverse Doppler effect, which lead to many potential applications of LHMs such as superlenses which, in principle, can achieve arbitrary subwavelength resolution. However, though the properties mentioned above are seen to be classical, the quantum phenomena in LHMs have also attracted attentions such as the modified spontaneous emission of atoms in LHME.     

基于LiCo0.8M0.2O2 (M=Ni,Zr)薄膜的全固态薄膜锂电池

用射频磁控溅射结合传统退火的方法制备LiCo0.8M0.2O2 (M=Ni,Zr)阴极薄膜．X射线衍射、拉曼光谱、扫描电子显微镜等手段表征了不同掺杂的LiCo0.8M0.2O2薄膜．结果显示,700℃退火的LiCo0.8M0．2O2薄膜具有类似α-NaFeO2的层状结构．通过对不同掺杂锂钴氧阴极的全固态薄膜锂电池Li／LiPON／LiCo0.8M0.2O2的电化学性能研究表明,电化学活性元素Ni的掺杂使全固态电池具有更大的放电容量(56μAh／cm2μm),而非电化学活性元素Zr的掺杂使全固态电池具有更好的循环稳定性．