水液相环境下两性α-丙氨酸Fe(Ⅱ)配合物的构型反转

采用密度泛函理论的M06和MN15方法,结合自洽反应场理论的SMD模型方法,研究了水液相下两性α-丙氨酸与二价铁离子配合物(A·Fe)的构型反转.考察了 a、b、c和d共4个反应通道,分别是:α-氢质子以羰基O为桥迁移;α-氢质子迁移到羰基O后,H质子再从氨基N向α-碳迁移;α-氢质子以氨基N为桥迁移;氢负离子以二价铁...     

关于声波在空气中衰减的实验研究

通过测量声波传播过程中声压峰值的变化,给出了声强衰减系数的实验结果和不确定度评估．     

吖啶橙-罗丹明B二聚体能量转移体系在DNA测定中的应用及机理研究

首次研究了吖啶橙 罗丹明B二聚体能量转移体系作为荧光探针用于DNA的测定 ,并对其机理进行了探讨。用于鲱鱼精DNA和小牛胸腺DNA的测定 ,线性范围分别为 0 33～ 1 33mg·L- 1 ,0 33～ 3 33mg·L- 1 ,检测限分别为 1 6 3× 10 - 3mg·L- 1 ,1 5 2× 10 - 3mg·L- 1 。对 1 0 0mg·L- 1 鲱鱼精DNA和小牛胸腺DNA的测定 ,相对标准偏差分别为 2 4 %和 2 0 %。     

冷冻水产品中乙萘酚残留的测定与降解规律

建立了冷冻水产品中乙萘酚残留的高效液相色谱-荧光检测(HPLC-FD)方法。样品经乙腈提取,平行蒸发仪浓缩,乙腈-甲苯溶液溶解残留物,固相萃取-冷冻去脂净化,HPLC-FD法分析,外标法定量。乙萘酚在0.50~10.00μg/mL范围内线性关系良好,R2=0.9998。添加水平在0.50、1.00、5.00 mg/kg时平均回收率在74.8%~91.7%之间,相对标准偏差为2.5%~9.4%。方法简便、高效、精密度高,适用于水产冻品中乙萘酚的测定;同时发现乙萘酚的降解速率与浓度有关,化学性质稳定。     

高效液相色谱-荧光检测法分析麦类中麦角克列斯汀碱

提出了一种采用高效液相色谱-荧光检测法(HPLC-FLD)测定麦类样品中麦角克列斯汀碱的方法。麦类样品经V(乙腈)∶V(0.1 mol/L乙酸铵缓冲溶液)=1∶4提取,以C18小柱净化,C18色谱柱(4.6×250 mm,5μm)分离,V(水)∶V(乙腈)=3∶2作流动相,流速1.0 mL/min,以HPLC-FLD定量测定。标准工作溶液浓度在1.0~50.0μg/L范围内,与峰面积成良好的线性关系,线性相关系数0.9999,样品在10.0、50.0、250.0μg/kg添加水平的回收率为76%~85%,相对标准偏差(RSD)为6.6%~8.8%(n=8),方法检测限为5.0μg/kg(S/N10)。     

D406螯合树脂对硫酸锌溶液中氟的吸附和解吸性能及动力学研究

研究了D406螯合树脂对硫酸锌溶液中氟的吸附和解吸性能,考察了影响氟吸附和解吸的因素以及该树脂吸附和解吸氟的动力学参数。结果表明,在25℃、pH=2、硫酸锌浓度为1.50mol/L、氟离子浓度为200mg/L条件下,D406螯合树脂对氟的吸附量为5.55mg/g。D406螯合树脂对氟的吸附符合Freundlich吸附模型。吸附和解吸的动力学符合Boyd液膜扩散方程,吸附反应活化能Ea=12.14kJ/mol,解吸反应活化能Ea=19.54kJ/mol。     

A Simple Scheme for Realizing a Multiqubit Controlled-Phase Gate Through a Resonant Interaction of Three-Level Atoms with a Single-Mode Cavity

A very simpJe theoretical scheme is proposed to implement two-and three-qubit controlled-phase gates firstly only using a single resonant interaction between ladder-type three-level atoms and the single-mode cavity. In the presented protocol, the quantum information is encoded on the stable ground states of the atoms （as the controlling qubits） and the zero- and one-photon Fock states of cavity-field （as the target qubit）. Under the influence of the atomic spontaneous emission, the decay of the cavity-mode, and deviation of the coupling strength, the three-qubit controlled- phase gate may have a comparatively high fidelity. The experimental feasibility of controlled-phase gate and the ease that is extended to realize N-qubit controlled-phase gate are also discussed.     

Lattice Waves in Two-Dimensional Hexagonal Quantum Plasma Crystals

Lattice waves including a longitudinal wave and a transverse wave in two-dimensional hexagonal quantum plasma crystals are investigated by using the modified Debye-Hückel screening potential. It is shown that there exists an unstable region of lattice parameters, where the system will melt. The general dispersion relations are derived, and the waves propagating parallel to a primitive translation vector are discussed. We find that both the longitudinal and transverse waves are acoustic-like, and the longitudinal wave has a greater sound speed than that of the transverse wave in the long wavelength limit region.     

200kV水介质高压脉冲延时线

介绍了200 kV水介质高压脉冲延时线的基本设计参数,阻抗为23.4Ω,电长度为300 ns;分析了该延时线的耐压特性,并对其传输脉冲幅度衰减率进行了估算。加工了一套高压脉冲延时线装置,并进行了实验研究。实验中,利用Blumlein线产生两路高压方波脉冲输出,一路经高压电缆-延时线-高压电缆到匹配负载,另一路经过高压电缆到匹配负载,两负载上的脉冲等效认为是延时线的输出脉冲和输入脉冲。实验结果表明,该延时线工作电压大于200 kV,输入方波脉冲前沿为30 ns,输出方波脉冲前沿增加到34.5 ns,方波脉冲幅度损耗率为1.8%。