一种新的永久周期磁铁聚焦的高功率宽带放大器

提出了一种新的高功率宽带放大器，它由速调管和自由电子脉塞组成，用永久周期磁铁聚焦。研究了这种器件的电子束聚焦、群聚和辐射。在速调管提供一阶调制系数为30%，波导管的半径1.51cm，摇摆器的磁场振幅0.16T，周期7.92cm，电子束的电压490kV，电流50A和半径0.368cm的条件下，预估这种器件的辐射波频率为11.4GHz，输出辐射功率为18MW，输出辐射带宽为44%。     

需求不确定影响下政府为绿色产品提供补贴的最优策略

考虑需求不确定因素的影响,应用报童模型,分析了政府为刺激绿色产品消费应该如何给消费者或供应企业提供补贴的问题。研究结果表明:政府部门希望实现政府补贴支出最小化的情况下,应该选择为消费者提供固定额度补贴。最优补贴额度由需求不确定因素以及政府制定目标销量共同决定。政府希望企业提高绿色产品产量的情况下,价格折扣为其最优选择。对消费者来说,随着需求不确定性增加,企业确定的最优产量将会增加,政府为绿色产品提供的补贴额度也将会提高,消费者实际购买价格将会降低,在需求不确定性较高的情况下,消费者购买绿色产品比较有利。     

短脉冲激光产生的等离子体X射线辐射

此文着重研究短脉冲强激光作用下的等离子体Ｘ射线辐射强度随入射激光能量或功率的变化，等离子体辐射主要由激光功率决定，实验显示了辐射曲线的突变区域和他和区域结构。此外，本结果表明在激光以２０Ｐｓ入射条件下的等离子体相对论吸收效应还不太明显，在等离子体中主要是逆韧致吸收。     

CHG-SRFEL光学速调管磁极间隙全闭环控制系统

 描述了CHG-SRFEL光学速调管磁极间隙全闭环控制系统的原理，给出了系统硬件结构和软件设计。可独立或同步调节光学速调管调制段、色散段及辐射段磁极间隙的大小，分辨率达到20μm，精度达到5μm。通过改进系统位置监测设备，可进一步提高分辨率及精度。系统已经在光学速调管磁场测量、垫补中使用，具有精度高、安全性高、操作方便等特点。     

嵌埋于沸石分子筛中的Fe_n团簇的磁性能研究

运用RKKY理论 ,推导了金属球形团簇间交换作用 ,并利用蒙特卡罗 (MC)方法模拟了嵌埋于沸石分子筛中的Fen 团簇体系的磁性能与团簇尺寸的关联效应。结果表明 :嵌埋式团簇体系的磁性能随团簇间距离呈震荡型 ,体系磁化强度随团簇分布密度及填充率的增大而增大 ,这对新型复合磁性材料的制备提供了参考。     

Study of Kinetics of Dispersion Polymerization of Styrene in Organic Media

The kinetics of dispersion polymerization of styrene in alcohol/methyl or butyl cellosolve was investigated with dried-weigh methods. The reaction parameters, such as concentration of initiator, polymerization temperature, and solvent, play an important role in determine polymerization rate. It was found that polymerization rate increases with the reaction temperature. The apparent activation energy is of 42.2kJ/mole and 52.6kJ/mole for the initial polymerization stage and the stationary polymerization interval. The polymerization rate increases with the concentration of the initiator with approximately 0.67 order dependence at conversion about 5%. It was described that the relation of conversion with the Hansen Parameters of media in detail by analysis of solvent dispersion, polarity and hydrogen bonding contributions. More significant was the result that polymerization rate versus conversion curve consisted of 3 intervals (2 non-stationary and 1 stationary one). The plateau of polymerization rate was observed in the curve of polymerization rate vs. monomer conversion.     

An environmentally friendly sodium dodecyl sulfate‐synergistic microwave‐assisted extraction followed by ultra‐high‐performance liquid chromatography with photodiode array method for the simultaneous extraction and determination of iridoids,phenylpropanoids, and lignans from Eucommiae Cortex

A simple and green sodium dodecyl sulfate‐synergistic microwave‐assisted extraction method was developed to extract and determine the iridoids, phenylpropanoids, and lignans in Eucommiae Cortex followed by ultra‐high‐performance liquid chromatography with photodiode array detection. The biodegradable solution (sodium dodecyl sulfate) was used as a promising alternative to organic solvents. The response surface methodology provided the optimum extraction conditions (2 mg/mL sodium dodecyl sulfate, 1100 W microwave power, and 6 min extraction time). The recoveries of three types of components ranged from 95.0 to 105% (RSDs < 5%). The intra‐ and inter‐day precision and accuracy were less than 3.40% and within the range of 97.1‐105%, respectively. Compared with other extraction methods, this newly established method was more efficient and environmental friendly. The results demonstrated that sodium dodecyl sulfate‐synergistic microwave‐assisted extraction followed by ultra‐high‐performance liquid chromatography with photodiode array method was applicable for the simultaneous extraction and determination of these three types of compounds for quality evaluation of Eucommiae Cortex.     

Salt‐assisted acetonitrile extraction and HPLC‐QTOF‐MS/MS detection for residues of multiple classes of pesticides in human serum samples

Detecting pesticide residues in human serum is a challenging process. In this study we developed and validated a method for the extraction and recovery of residues of multiple classes of pesticides from serum using one reagent. Salt‐assisted acetonitrile extraction and high‐performance liquid chromatography with quadrupole time of flight tandem mass spectrometry were used to quantitate 34 pesticides classified in nine groups of chemicals in human serum samples, which are frequently detected in food. The recoveries for 33 of analyzed pesticides ranged from 86 to 112% with relative standard deviations below 15%. The limits of quantitation and linearity of 31 of the pesticides were 1 µg/L and >0.990, respectively. The lower limit of quantitation has been reported in the literature particularly for multi‐classes pesticide mixtures in human serum. The salt–acetonitrile reagent was allowed to achieve good recoveries and detection limits, which could be attributed to salt altering the solvent polarity, preferentially collecting the organic phase in the solution, and promoting the extraction. The developed method was applied for two organophosphate pesticide metabolites, diethylphosphate and 3,5,6‐trichloro‐2‐pyridinol, in serum from rats that were fed a nonlethal quantity of chlorpyrifos. The concentrations of these two were 252.18 ± 15.47 and 0.63 ± 0.23 µg/L, respectively.     

中药质谱分析方法及应用研究

分别从中药成分分析、活性筛选和代谢组学三方面对质谱技术在中药研究中的应用进展进行了全面综述.在中药成分分析方面,重点介绍了寡糖异构体的分析方法,以及质谱指纹图谱技术在中药成分分析及质量控制中的应用;在活性筛选方面,分别介绍了超滤-质谱、细胞膜色谱-质谱、微透析-质谱、亲和色谱-质谱、强度衰减质谱、修饰琼脂糖珠-质谱和直接分析质谱等技术及其应用;在代谢组学研究方面,对中药治疗肝损伤、肾虚、心肌梗死和糖尿病等疾病方面的研究进展进行了阐述.上述内容充分反映了质谱技术在中药创新性研究中的重要性.     

长余辉发光材料研究进展

自从20世纪初发现长余辉现象以来，长余辉材料的发展取得了长足进展。从长余辉现象的发现到20世纪90年代，性能最好的长余辉材料为金属硫化物体系长余辉材料。从1992年起，新型铝酸盐长余辉材料的发展十分迅速，它的发光强度、发光时间、化学稳定性都较第一代长余辉材料有很大改进，长余辉材料的发展进入了一个新的阶段。在铝酸盐体系实现了蓝紫、蓝绿、黄绿、黄橙色发光，其中的蓝绿、黄绿两种长余辉材料是目前发光性能最好的长余辉材料。在硅酸盐体系蓝色长余辉材料发光强度及发光时间大大超过铝酸盐体系蓝紫色长余辉材料，是另一类极有前途的新型长余辉材料。红色长余辉材料的发展也取得了很大进步，目前在多个体系实现了红色自发光。性能最好的红色长余辉材料发光亮度达到CaS类红色长余辉材料的6倍以上，余辉时间达6-8小时。长余辉材料的应用研究也进展迅速。