Modification of Absorption of a Bulk Material by Photonic Crystals

We show theoretically that it is possible to modify absorption of a bulk absorbing material by inserting another non-absorbing dielectric slab periodically to form one-dimensional photonic crystals.It is found that,for frequencies within photonic bandgaps,absorption is always suppressed.For frequencies located at photonic bands,absorption can be suppressed or enhanced,which depends on the relative values of the real refractive index of the absorbing and non-absorbing dielectric layers.     

Fluorescence Microscopy of Nanoscale Silver Oxide Thin Films

The experimental conditions for photoactivated intermittent fluorescence from nanoscale silver oxide were studied with fluorescence microscopy.Strong fluorescence was observed from the Ag2O particles with size of 10-20nm excited with both blue and green light .We observed the saturation of Photoexcitation with blue light and explained the experimental results using the model of agglomeration of silver atoms to form small clusters and the fluorescence of Ag2 and Ag3 clusters.     

掺铒光纤中受激拉曼散射与受激四光子混频研究

掺铒光纤中受激拉曼散射与受激四光子混频研究余仲秋，李心民，徐永安（郑州信息工程学院邮编４５０００２）袁斌，沈书泊（郑州大学物理工程学院邮编４５００５２）ＡＳｔｕｄｙｏｎＳＲＳａｎｄＳＦＰＭｉｎＥｒ￣（３＋）ｄｏｐｅｄＯｐｔｉｃａｌＦｉｂｅｒ￥ＹｕＺｈ...     

在白噪声分析中的广义维里拉普拉斯

一类广义维里拉普拉斯，把在白噪声分析构架中通常定义的维里拉普拉斯作为特殊情形而包含。     

SYNTHESIS OF MACROPOROUS COPOLYMER OF VCA AND DVB

The reactivity ratios of vinyl acetate(VAc) and divinyl benzene (DVB) were calculated from the Q and e values.The possibility of the copolymerization of these two monomers was predicted and the copolymerization was carried out by suspension polymerization technique in the presence of pore producing agent (toluene and gasoine).The relative ratio of acetoxy group and benzene ring in the copolymer were monitored by IR measurement during the polymerization.The variation of pore properties,such as spectific surface area,porosity and average pore diameter,with polymerization time were determined.The copolymers at various polymerization time were alcoholyzed and thus the variation of the hydroxyl group content with polymerization time was studied.     

复罗尔定理

复罗尔定理俞飞，余继光，史元祜（淮南联合大学）一、引言众所周知，许多古典的实分析结论是罗尔定理和中值定理的推论。一般情况下，由巴拿赫空间的子集映射到另一子集时，中值定理是一个适合于许多应用的不等式，但不适合于建立如同实变量的罗尔定理的等式。最近，有关...     

圆柱和平板磁绝缘传输线的横向空间电荷流

根据电磁场理论及电子运动守恒方程导出传输线横向空间电荷流的数值模型和磁绝缘临界条件，对圆柱和平板情况进行了计算和讨论。     

离子交换—原子捕集—火焰原子吸收光谱法测定水中的超痕量镉

在本文提供的条件下，镉的原子捕集灵敏度较常规法高81倍，再考虑到离子交换法的浓缩倍数至少可达40倍，因此可使镉的测定灵敏度至少提高3240倍，从而成功地测定了水中ppt级的超痕量镉。     

乳化技术原子吸收光谱法测定汽油中的铅

本文以Span-80与Tween－20为复合乳化剂，将汽油分散成均匀的油水乳化液，可直接喷入空气－乙炔火焰中进行测定，本法简单快速，乳化液稳定时间长。回收率在97－103％之间，相对标准偏差在4％以内，本法测定结果与络合滴定法基本一致。