中医方药量化研究中“相对药量”数学模型体系再探

研究了初探建立的"相对药量"量化模型体系中关键的三个问题:"三段式"模式的不合理性及转化成"一段式"模式的问题;同一种药物在不同的模型下,常用量范围两个端点处无差异性问题;不同药物在不同的常用量范围、相同的常用量范围端点处无差异性问题.并给出新的量化模型体系,说明新模型体系的合理性与适用性.     

电雾化、电纺丝和带电射流稳定性研究

简述了电雾化和电纺丝的基本原理及其应用,总结了电雾化和电纺丝现象中几个基本的力学 机理,并重点对电雾化和电纺丝现象中的带电射流稳定性问题及其研究进展作了介绍.     

Michelson干涉仪式光纤空气声传感器

介绍了一种用于直升机等低空目标探测的光纤空气声传感器.该传感器基于光纤Michelson干涉仪的原理,结合弹性盘片的应力应变理论分析和光纤粘接的工艺设计,采用相位载波解调技术进行信号解调.对比实验测试验证了这种声音探测技术可行性.传感器理论灵敏度为2.38 rad/Pa,实测灵敏度为1.5 rad/Pa,采用PGC相位解调理论最小可探测的最小声信号为6.7 μPa,即9.5 dB.传感器在20～300 Hz范围内响应基本平坦.结合声音传播规律分析并肯定其在实用中的可行性.     

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

We theoretically investigate the quantum path selection in an ultraviolet(UV)-assisted near-infrared field with an UV energy below the ionization threshold. By calculating the ionization probability with different assistant UV frequencies, we find that a resonance-enhanced ionization peak emerges in the region Euv < Ip, where Euv is the photon energy and Ip is the ionization energy. With an attosecond pulse train(APT) centered in the resonance region, we show that the short quantum path can be well selected in the continuum case. By performing the electron trajectory analysis, we have further explained the physical mechanism of the quantum path selection. Moreover, we also demonstrate that in the resonance region, the harmonic emission from the selected paths is more efficient than that with the APT energy above the ionization threshold.     

QuEChERS-液相色谱/串联质谱法测定果蔬及其制品中矮壮素和缩节胺残留

建立了果蔬及其制品中矮壮素和缩节胺残留的QuEChERS-液相色谱/串联质谱(HPLC-MS/MS)检测方法。样品以乙腈提取,经N-丙基乙二胺(PSA)和石墨化碳(GCB)净化,采用电喷雾正离子源(ESI+)、多重反应监测(MRM)模式进行测定,基质匹配标准曲线定量。结果表明:在苹果、浓缩苹果汁、番茄、番茄酱、胡萝卜、胡萝卜汁、香蕉、辣椒8种基质中,矮壮素和缩节胺在0.5~50ng/mL范围内的线性关系均较好(r2>0.997)。1、4、8、20μg/kg四个添加水平下,矮壮素的回收率在78.4%~107.8%,相对标准偏差为2.3%~7.5%;缩节胺的回收率在75.9%~100.9%,相对标准偏差为2.5%~8.6%。该法简单、准确、快速、灵敏,符合法规残留限量监测要求。     

Status of CSNS H- ion source

A new H^- ion source has been installed successfully and will be used to serve the China Spallation Neutron Source (CSNS). In this paper, we report various components of the ion source, including the discharge chamber, temperature, cooling system, extraction electrodes, analyzing magnet, remote control system and so on. Compared to the previous experimental ion source, some improvements have been made to make the ion source more compact and convenient. In the present arrangement, the Penning field is generated by a pair of pole tip extensions on the 90° analyzing magnet instead of by a separate circuit. For the remote control system, F3RP61-2L is applied to the accelerator online control system for the first time. In the running of the ion source, a stable pulse H^- beam with a current of 50 mA at an energy of 50 keV is produced. The extraction frequency and pulse width is 25 Hz and 500 μs, respectively. Furthermore, an emittance scanner has been installed and measurements are in progress.     

多肽自组装膜用于凝血酶的检测

利用自组装膜技术在石英片表面构建了多肽自组装膜。考察了组装液浓度和组装时间对多肽自组装膜组装效果的影响,并用紫外可见吸收光谱仪和扫描电镜对该膜进行了表征。研究结果表明,当γ-氨基丙基三乙氧基硅烷水溶液浓度为1%(V/V),组装时间为3 h;金纳米浓度为2.4×10-4mol/L,组装时间为12 h;多肽浓度为1×10-4mol/L,组装时间为12 h时,组装效果最好。基于凝血酶可特异性酶切多肽中精氨酸和甘氨酸之间的肽键,建立了一种测定微量凝血酶的新方法,方法的线性响应范围为2.8×10-12~9.9×10-10mol/L,检出限为1.4×10-12mol/L。此膜用于血清样品中凝血酶的测定,回收率为91.6%~107.6%。     

苯酚氧化羰基化反应产物的高效液相色谱分析

采用高效液相色谱法分析了苯酚氧化羰基化反应产物,确定了色谱条件:KromasilTM C18色谱柱(150 mm×4.6 mm,5μm),检测波长254 nm,流动相V(甲醇):V(水)=65:35,流速0.6 mL/min.对碳酸二苯酯(DPC)和苯酚进行了定量分析,DPC和苯酚的外标曲线相关系数分别为0.99966...     

用ICP-AES双向观测同时测定土壤、沉积物和植物中常、微量元素

采用水平炬管设计的Optima3000DV全谱直读等离子体发射光谱仪 ,利用端视与侧视观测方式相结合 ,多元光谱拟合 (MSF)校正光谱干扰 ,用纯标准溶液配制混合标准系列作校准曲线 ,同时测定了土壤、沉积物和植物中Al、Ca、K、Mg、Na、Fe、Ti、As、Cd、Co、Cu、Mn、Mo、Ni、P、Pb、V、Zn18个常量、微量元素。经几个国家标准样品的验证 ,测定结果与推荐值基本相符 ,实际样品回收率土壤在92%～105 %之间 ,蔬菜在87.8%～104%范围。相对标准偏差分别为0.28%～4.23 %和0.26 %～3.66%。     

火焰原子吸收光谱法测定羊血中铁、铜和锌3种微量元素

建立了湿法消解-火焰原子吸收光谱法对羊血中Fe、Cu和Zn 3种微量元素测定的方法.方法的校准曲线线性关系良好（r=0.9965-0.9999）,方法加标回收率（n=5）在96.2％-98.5％之间,RSD值（n=5）在1.3％-4.9％之间.为了解动物微量元素含量提供参考,也为进一步研究畜禽疾病与微量元素的相关性提供基础资料.