海底沉积物声衰减同轴差距衰减测量法与其他测量方法的对比研究

以精度较高的现场测量Hamilton的原位测量所得数据为标准，对比研究了钱正明的直立同轴衰减测量法、刘强

ZnO单晶的缺陷及其对材料性质的影响

利用X射线衍射技术、荧光光谱、霍尔效应和光学显微等方法分别研究了ZnO单晶的品格完整性、深能级缺陷、电学性质、位错和生长极性．通过比较ZnO单晶材料在退火前后的测试结果，分析了材料的缺陷属性和缺陷对材料性质、晶体完整性的影响．

非原生掺杂半绝缘磷化铟（InP）及其应用对比

过去的几年中，由于1.31和1.55μm波长半导体激光器在光纤通信领域得到了广泛的应用，磷化铟（InP）衬底材料的研究和规模化生产因此受到了极大的推动，并已逐步成为继硅（Si）和砷化镓（GaAs）之后又一重要的化合物半导体材料。与GaAs相比，InP晶体具有高的饱和电场漂移速度、良好的导热性和较强的抗辐射能力等优点，因此更适合于制造高频、高速、大功率及外层空间用微波器件和电路。从实际使用的情况看，n和p型InP衬底的性能已基本满足要求，而半绝缘类型衬底则无论从一致性还是均匀性方面都需要较大程度地改善。相应地，这种改善的途径和方法已成为半导体材料的研究热点之一。

Knotted wave dislocation with the hopf invariant

We study the wave dislocations with an induced gauge potential. The topological current characterized the wave dislocations is constructed with the dual of Abelian gauge field. And the topological charges and locations of the wave dislocations are determined by the phi-mapping topological current theory. Furthermore, it is shown that the knotted wave dislocations can be described with a Hopf invariant in the wave field. At last we discussed the evolution of the knotted wave dislocations.

新型多道高精度的时间一电压转换电路系统的设计

现在的粒子物理和核物理实验中,大规模探测器得到广泛应用,对后继的电子学系统主要要求能量分辨率好,时间响应快,屏蔽特性好,性能稳定,易于控制,高集成度,高密度等。为了满足这些要求,我们采用经过改进的经典的模拟电路与数字控制电路相结合的方式,将重点讨论系统的控制系统的设计与实现。

Determination of ultra-trace concentrations of elements in high purity tellurium by inductively coupled plasma mass spectrometry after Fe(OH)(3) coprecipitation

In this work, a method was established for the determination of impurities in high purity tellurium by inductively coupled plasma mass spectrometry (ICP-MS) after Fe(OH)(3) coprecipitation. After comparison of coprecipitation ability and separation efficiency between Fe(OH), and Al(OH)(3), Fe(OH)(3) was chosen as the precipitate. A separation factor of 160 for 200 mg tellurium was obtained under conditions of pH 9 and 2 mg of Fe3(+). The 13 elements, such as Bi, Sn, Pb, In, Tl, Cd, Cu, Co, Ni, Zn, Ti, Be and Zr, could be almost completely coprecipitated under these conditions. In addition, Te memory effect imposed on the ICP-MS instrument was assessed, as well as Te matrix effect that caused the low recovery of Ga, As, Sb and V in real sample was discussed. Finally, the method was evaluated through recovery test and was applied to practical sample analysis, with detection limits of most of the elements being below 0.15 mug g(-1) and R.S.D. below or at approximately 10%, which indicated that this method could fully satisfy the requirements for analysis of 99.999% similar to 99.9999% high purity Te.

M(EGTA)配合物的NMR研究

乙二醇-双-(α-氨基乙基醚)四乙酸(EGTA)是一种Ca~(2+)高选择性螯合剂,结合Ca~(2+)能力比Mg~(2+)强10~6倍,被认为是钙结合蛋白钙结合位的理想配位模型。Ca(EGTA)的晶体结构虽已确定,但其溶液结构仍不清楚。考虑Ca~(2+)离子半径(0.99