Construction of the BRST-Invariant Action for a Gauged Self-Dual Theory by Making Use of the Batalin-Fradkin Algorithm

The Batalin-Fradkin algorithm combined with the Batalin-Fradkin-Vilkovisky formalism is applied to a two-dimensional model of a self-dual field interacting chirally with a gauge field. A Becchi-Rouet-Stora-Tyutin gauge-fixing action is obtained with auxiliary fields introduced in the algorithm turning into a Wess-Zumino field. The chirality of the Wess-Zumino field appears in a natural way.     

金电极表面聚赖氨酸固定微过氧化物酶-11的电化学研究

通过聚赖氨酸修饰将微过氧化物酶-11(MP-11)固定在金电极表面,制备成MP-11修饰电极.修饰在电极表面上的MP-11的血红素活性中心与电极之间可进行直接的电子传递反应,其氧化还原式电位为-0.39V.该修饰电极对氧的还原具有电催化活性.当MP-11与咪唑发生轴向配位反应时,其氧化还原式电位发生负移,此时对氧的还原不再具有电催化活性.     

Low voltage substrate current： a monitor for interface states generation in ultra-thin oxide n-MOSFETs under constant voltage stresses

The low voltage substrate current （Ib） has been studied based on generation kinetics and used as a monitor of interface states （Nit） generation for ultra-thin oxide n-MOSFETs under constant voltage stress. It is found that the low voltage Ib is formed by electrons tunnelling through interface states, and the variations of Ib（△Ib） are proportional to variations of Nit （△Nit）. The Nit energy distributions were determined by differentiating Nit（Vg）. The results have been compared with that measured by using gate diode technique.[第一段]     

Simultaneous Determination and Health Risk Assessment of Four High Detection Rate Pesticide Residues in Pu’er Tea from Yunnan,China

Four pesticides with a high detection rate in Pu’er tea have been determined by a QuEChERS (quick, easy, cheap, effective, rugged, safe) method with multiwalled carbon nanotubes (MWCNTs), and combined ultrahigh-performance liquid chromatography–triple quadrupole linear ion trap-tandem mass spectrometry (UHPLC-QTRAP-MS/MS). MWCNs have been compared with other common purification materials, and found to be superior. The matrix effect was systematically studied, and the results show that the MWCNs can quickly and effectively reduce matrix interference values, which were in the range from −17.8 to 13.8. The coefficients (R²) were greater than 0.99, with the limit of quantification ranging from 0.1 to 0.5 μg/kg, and the recovery rate ranging from 74.8% to 105.0%, while the relative standard deviation (RSD) ranged from 3.9% to 6.6%. A total of 300 samples, taken from three areas in which Yunnan Pu’er tea was most commonly produced, tested for four pesticides. The results show that the detection rate of tolfenpyrad in Pu’er tea was 35.7%, which is higher than other pesticides, and the lowest was indoxacarb, with 5.2%. The residual concentrations of chlorpyrifos, triazophos, tolfenpyrad and indoxacarb ranged from 1.10 to 5.28, 0.014 to 0.103, 1.02 to 51.8, and 1.07 to 4.89 mg/kg, respectively. By comparing with China’s pesticide residue limits in tea (GB 2763-2021), the over standard rates of chlorpyrifos, tolfenpyrad, and indoxacarb were 4.35%, 0.87% and 0%, respectively. The risk assessment result obtained with the hazard quotient (HQ) method shows that the HQ of the four pesticides was far less than one, indicating that the risk is considered acceptable for the four pesticides in Pu’er tea. The largest HQ was found for tolfenpyrad, 0.0135, and the smallest was found for indoxacarb, 0.000757, but more attention should be paid to tolfenpyrad in daily diets in the future, because its detection rate, and residual and residual median were all relatively high.     

BFV Quantization of the Minimal Chiral Schwinger Model

Both the gauge-invariant and the gaugenoninvariant versions of the minimal chiral Schwinger model are quantized by using the BFV formalism for the two cases of the regularization'parameter a > 1 and a = 1. The equivalence of these two versions of the model is then established in a gauge-independent manner.     

硼酸铅玻璃的光学二次谐波产生

对硼酸铅玻璃体材料样品进行热辅助的平板电场极化(简称热极化)后,通过观察其光学二次谐波(SHG)信号的强弱,得到了不同组分的样品的最佳极化温度,发现其最佳极化温度与玻璃化温度满足一定的关系;同时得到了不同组分的样品在各自的最佳极化温度条件下极化后的二次谐波信号强度与组分的关系;经过对一种组分的样品进行细致研究,发现样品的二次谐波信号强度随着极化电压的增大而增大,并满足幂函数关系.利用有效偶极子释放模型解释了样品的二次谐波信号强度与极化电压之间的超平方关系 关键词： SHG 玻璃 极化     

N-(1,3,4-噻二唑-2-基)-N'-芳氧乙酰基脲的合成及其生物活性

通过2-氨基噻二唑与芳氧乙酰基异氰酸酯反应合成了11种新的N-(1,3,4-噻二唑-2-基)-N'-芳氧乙酰基脲化合物.产率为50.2%-68.7%.用红外光谱、核磁共振氢谱和元素分析测试技术确证了它们的结构,初步的生物活性测试实验表明,部分目标化合物具有优良的植物生长调节活性,其中2d、2e和2k生长素活性的促进率分别达到40.1%、35.5%和28.8%.     

Omnidirectional emission from top-emitting organic light-emitting devices with microstructured cavity

We demonstrate optimized viewing-angle characteristics from top-emitting organic light-emitting devices by integrating a periodic microstructure into the cavity. A holographic lithography technique combined with filling process of the groove by spin coating of a polymer film has been employed to enable its periodically and gradually changed cavity length and suppress the viewing-angle dependence of the peak emission wavelength and intensity. The theoretical and experimental results support that the proposed microstructured cavity can resolve the angular-dependence effect in a very simple and effective way, and a desired omnidirectional emission has been obtained.     

Study on the PSL mechanism in BaFCl:Eu<Superscript>2+</Superscript> phosphors

In this paper, the ESR and photoluminescence (PL) of BaFCl and BaFCl:Eu²⁺ radiated or un-radiated by X-ray were observed. The single electron in the color center could be produced in BaFCl without Eu²⁺. A series of traps of different energy level in BaFCl lattice were formed, and some shallow traps of them could be bleached by Vis-light, and the other deep traps could not. The bleaching effects on ESR and photostimulated luminescence (PSL) were investigated. An F-H-Eu²⁺ complex (F color center, H color center and Eu²⁺ complex) in the lattice of BaFCl:Eu²⁺ was suggested when the phosphor was X-ray irradiated. The Eu²⁺ located in the complex has only contribution to the ESR signal, but has no contribution to PL spectrum. The excitation of both F-center and located Eu²⁺ could decompose the complex to induce bleaching. The 440 nm light could excite the F-centers and the 220 nm and 270 nm could excite the located Eu²⁺, and the excitation disturbed the F-H-Eu²⁺ complex and caused a decrease of the PSL.