HZ associated production with decay in the Alternative Left-Right Model at CEPC and future linear colliders

In this study, Higgs and Z boson associated production with subsequent decay is attempted in the framework of alternative left-right model, which is motivated by superstring-inspired E_6 model at CEPC and future linear colliders. We systematically analyze each decay channel of Higgs with theoretical constraints and latest experimental methods. Due to the mixing of scalars in the Higgs sector, charged Higgs bosons can play an essential role in the phenomenological analysis of this process. Even though the predictions of this model for the signal strengths of this process are close to the standard model expectations, it can be distinct under high luminosity.     

Design strategy for flat-field Schmidt optical system

The present study provides the theory base for designing flat-field Schmidt optical systems, based on the wavefront aberration of Petzval field curvature, a mathematic model of the Petzval radius is setting up. The radius of Petzval image surface is not equal to the focal length of the primary mirror or the focal length of the system. An aberration balancing method for flat-field Schmidt optical systems design is proposed: did not change parameters of the corrector, through adjusting the distance between the plate and the mirror to realize aberration equilibrium. The total physical track is more compact than equilibrium before.     

A novel MI-insensitive and filterless frequency octupling scheme based on two parallel dual-parallel Mach–Zehnder modulators

A novel MI-insensitive and filterless frequency octupling scheme based on two parallel dual-parallel Mach–Zehnder modulators (DP-MZMs) is proposed. The proposed scheme is not sensitive to modulation index and relatively strong MMW signal with good radio frequency spurious suppression ratio (RFSSR) can be obtained without strict requirement on modulation index. Filterless feature makes the scheme quite suitable for wavelength division multiplexing (WDM) applications. For verification, a 60 GHz millimeter wave with 44 dB RFSSR is generated from a 7.5 GHz radio frequency wave by simulation. Performance of the proposed scheme has been characterized under different conditions including DC-bias drifts of MZMs, different amplitudes of RF inputs and different extinction ratios of MZMs.     

具时变刚度的相对转动非线性动力系统的周期解问题

建立了一类具有时变刚度,非线性阻尼力和强迫周期力项的相对转动非线性动力系统. 运用Mawhin重合度理论,得到了该模型的周期解存在唯一性结果,推广了已有的结果, 并且列举了具体的例子来说明本文的结果是新的. 关键词： 相对转动非线性动力系统 时变刚度 周期解 存在唯一性     

[四-(三-甲氧基-四-羟基)苯基]-锌卟啉-环糊精超分子体系研究

在中性磷酸盐缓冲溶液中,以紫外-可见分光光度法和荧光光谱法研究了对称性卟啉[四-(三-甲氧基-四-羟基)苯基]-锌卟啉(简称T(3-MO-4-HP)P-Zn)与α-CD、β-CD、γ-CD三种环糊精之间相互作用形成的超分子体系.结果表明T(3-MO-4HP)P-Zn卟啉与3种环糊精均形成1∶1的包结物.利用双倒数曲线法计算了T(3-MO-4-HP)P-Zn-CD超分子体系的包结常数,结果表明T(3-MO-4-HP)P-Zn与β-CD表现出最强的包结能力.     

Controllable synthesis of high aspect ratio Mg_2B_2O_5 nanowires and their applications in reinforced polyhydroxyalkanoate composites

Highly pure magnesium borate （Mg2B2O5） nanowires with an average diameter of - 30 nm, an average length of 15 μm, and a high aspect ratio of - 500 have been synthesized on a large scale via a two-step method. MgBO2（OH） nanowires with high aspect ratios were first prepared via a PVP-assisted hydrothermal technique. Using these nanowires as precursors, single crystalline Mg2B205 nanowires were synthesized by post-annealing treatment at a relatively low temperature of 700 ℃. The important effect of the MgBO2（OH）-Mg2B2O5 conversion process on the morphology of the Mg2B2O5 nanowires was investigated and it was indicated that the recrystallization process plays an important role in the protection of the one-dimensional （1D） nanostructure. Moreover, the rigidity and the toughness of the Mg2B2O5 nanowire- reinforced PHA composites were tremendously improved compared to those of the pure PHA. Our results demonstrate the effectiveness of Mg2B2O5 nanowires for reinforcement applications in polymer composites.     

Interfacial and electrical properties of HfAlO/GaSb metal-oxide-semiconductor capacitors with sulfur passivation

Interfacial and electrical properties of HfAlO/GaSb metal-oxide-semiconductor capacitors(MOSCAPs) with sulfur passivation were investigated and the chemical mechanisms of the sulfur passivation process were carefully studied. It was shown that the sulfur passivation treatment could reduce the interface trap density Ditof the HfAlO/GaSb interface by 35% and reduce the equivalent oxide thickness(EOT) from 8 nm to 4 nm. The improved properties are due to the removal of the native oxide layer, as was proven by x-ray photoelectron spectroscopy measurements and high-resolution cross-sectional transmission electron microscopy(HRXTEM) results. It was also found that GaSb-based MOSCAPs with HfAlO gate dielectrics have interfacial properties superior to those using HfO2 or Al2O3 dielectric layers.     

两种铽配合物与PVK混合体系的发光机理研究

研究了稀土配合物Tb(p-MBA)₃phen(样品Ⅰ)和Tb(p-ClBA)₃phen(样品Ⅱ)与导电聚合物材料PVK掺杂体系的光致发光和电致发光特性。发现在样品Ⅰ与PVK混合薄膜的光致发光中,除了三价铽离子的发光外,还能看到明显的PVK的发光;而在电致发光中,PVK的发光完全被抑制,只能看到Tb3+的绿光发射。对样品Ⅱ与PVK的混合发光层,无论其光致发光谱还是电致发光谱,都没有看到410 nm处PVK的发射。进一步测量两种材料的激发光谱,初步探讨了器件的发光机理。样品Ⅰ的发光可能来源于两个方面,一是PVK到稀土配合物的不完全的能量传递,二是由于载流子俘获机理;样品Ⅱ的发光则是由于PVK到稀土配合物的完全的能量传递。     

吖啶红与铬(Ⅵ)的高灵敏度荧光反应及应用

研究了在硫酸介质中,铬(Ⅵ)氧化吖啶红荧光增强反应的最佳实验条件,建立了测定痕量铬(Ⅵ)的新的高灵敏度荧光分析法。该方法的检出限为0.6 μg·L-1,线性范围为2.0～32 μg·L-1,对含量为4.0和28 μg·L-1的Cr(Ⅵ)标准溶液进行11次平行测定, 其相对标准偏差分别为2.0%和1.0%。该法用于电镀液、废铬酸洗液及合金钢中痕量铬(Ⅵ)的测定,与标准样品和二苯碳酰二肼分光光度法进行了对照,获得了满意结果。     

Superamphiphobic,light-trapping FeSe2 particles with a micro-nano hierarchical structure obtained by an improved solvothermal methodSuperamphiphobic,light-trapping FeSe2 particles with a micro-nano hierarchical structure obtained by an improved solvothermal methodSuperamphiphobic,light-trapping FeSe2 particles with a micro-nano hierarchical structure obtained by an improved solvothermal method

Wettability and the light-trapping effect of FeSe2 particles with a micro-nano hierarchical structure have been inves- tigated. Particles are synthesized by an improved solvothermal method, wherein hexadecyl trimetbyl ammonium bromide （CTAB） is employed as a surfactant. After modifying the particles with heptadecafluorodecyltrimethoxy-silane （HTMS）, we find that the water contact angle （WCA） of the FeSe2 particles increases by 6.1~ and the water sliding angle （WSA） decreases by 2.5~ respectively, and the diffuse reflectivity decreases 29.4% compared with similar FeSe2 particles synthe- sized by the conventional method. The growth process of the particles is analyzed and a growth scenario is given. Upon altering the PH values of the water, we observe that the superhydrophobic property is maintained quite consistently across a wide PH range of 1-14. Moreover, the modified particles were also found to be superoleophobic. To the best of our knowledge, there is no systematic research on the wettability of FeSe2 particles, so our research provides a reference for other researchers.