基于细菌视紫红质光子逻辑门的实验研究

研究了基于细菌视紫红质(简称BR或菌紫质)变种材料D96N的3种光逻辑操作.在633nm激发光照射下，菌紫质分子会被激发到M态，处于M态的菌紫质对412nm的紫光呈较大吸收，会抑制同时入射的紫光.选择合适的紫光强度，通过CCD观测被抑制的412nm检测光透射强度分布，模拟了“非”、“或非”、“与非”几种基本的光子逻辑操作. 关键词： 细菌视紫红质 光子逻辑门 互补抑制     

Multi-Mode Excited Logic Gates on Trapped Ions

Based on the scheme of “hot“ trapped-ion quantum computation proposed by Sφrensen and Mφlmer, we construct a set of multi-mode excited logic gates on trapped ions, which may be operated on arbitrary even number of ions selected randomly from a string of ions trapped in a linear trap. The gate speed may be made faster than that of the corresponding one-mode excited logic gate by adjusting appropriately the detunings of driving lasers with respect to the sidebands of vibrational modes and can be demonstrated in current experimental techniques.     

美国开始研制量子计算机

 十余年前,已故物理学家理查德·费曼曾有一个梦想:将量子力学中神秘的,互相矛盾着的状态充作计算工具,则其运算速度将会超过可能制造出的、速度最快的经典计算机。     

简易OMA系统作钢样光谱快速定性分析

本文介绍了用一维ＣＣＤ摄象头，多色仪及微机组成的光学多道分析仪系统（简称ＯＭＡ），研究了该系统作光谱化学分析的可行性，自编软件完成波长校正和谱线查找后，自动报出定性和半定量分析结果。     

主被动锁模光纤激光器的脉宽计算及其稳定性分析

分析了主被动锁模光纤环形孤子激光器的运行机理，用分裂步长法进行了数值模拟，获得了重复频率为１０ＧＨｚ，脉宽为９８５ｆｓ的稳定的孤子脉冲序列，通过孤子参量演化方程的求解，获得了光结环形孤子激光器的稳定运行条件及孤子脉宽的解析表达式。     

高透光p型CuSCN薄膜的电沉积制备及机理研究

A stable aqueous electrolyte solution containing Cu(Ⅱ) cations and (SCN) anions was prepared by adding EDTA(ethylenediamine tetraacetic acid disodium salt, C₁₀H₁₄N₂O₈Na₂·2H₂O) to chelate with Cu(Ⅱ) cations. CuSCN films were electrodeposited on transparent ITO conducting substrates from as-prepared electrolyte solution. Deposition mechanisms of CuSCN at varied temperatures have been studied. The results indicate that electron quantum tunnel through CuSCN film plays a role and the dense thin film with nanocrystals was obtained at or below room temperature. However, at higher temperature, a thermally activated process was involved and a thick film was obtained. It has been calculated that the activation energy of the growth for crystals is 0.5 eV. XPS pattern shows that the electrodeposited film is (SCN) in stoichiometric excess, indicating a p-type film. As-prepared CuSCN film was with high transmittance (≥85%) in the visible optical range and the direct transition band gap was 3.7 eV.     

双组分茂金属催化剂催化乙烯聚合的研究

选择能形成支链的不对称桥联茂金属化合物Me2 C[(Cp) (Ind) ]ZrCl2 和非桥联的不同结构的茂金属化合物二氯二 (烯基取代环戊二烯 )锆如 ( Cp) 2 ZrCl2 ,(Cp) 2 ZrCl2 和 (Cp) 2 ZrCl2 ,以MAO为助催化剂 ,分别组成三组双组分茂金属催化剂的催化体系 ,催化乙烯聚合 .结果表明 ,两类催化剂组成的双组分茂金属催化体系催化乙烯聚合能得到支化的宽分子量分布的聚乙烯 ;聚合温度和改变两种茂金属催化剂的摩尔比对催化活性和分子量有很大影响 .因此可以利用改变双组分茂金属催化剂的摩尔比例和聚合温度来调控聚合物的分子量和分子量分布 .改变两种茂金属催化剂的摩尔比和聚合温度也能使聚合物的结晶度发生改变     

Phase Structures of Nascent Polyethylene Powder Studied by Wideline Proton NMR

The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile chains, （2） a soft region with liquid-like character which produces a Lorentzian contribution to the spectrum, and （3） an intermediate region in which the rotation of methylene groups about C-C bonds is partially hindered. The relative mass fractions as well as chain mobilities varied greatly among samples produced by different polymerization techniques. The NMR crystallinity agreed well with that estimated by WAXD and was much higher than DSC crystallinity, indicating an inclusion of the contribution from a crystalline-amorphous interphase. The crystalline defects in the rigid part could be significantly affected by processing parameters when employing the same type of polymerization technique. The intermediate region in the NMR spectra was analyzed according to the comparison between bimodal high density polyethylene and corresponding linear unimodal one. It was found that the mass fraction of the NMR interphase could be an indication of the percentage of tie molecules between crystalline lamellae and thus may significantly affect the mechanical properties of polymeric material.