Conformation of an Amphiphilic Comb-like Copolymer in a Selective Solvent

Chinese Journal of Polymer Science - We study the conformation of an amphiphilic comb-like copolymer in a selective solvent by using Brownian dynamics simulations. Our results demonstrate that,...     

Self-assembled Conformations of a Core-shell Comb-like Chain with Adjustable Architectural Parameters

Chinese Journal of Polymer Science - Combining Brownian dynamics simulations and self-consistent field theory, we demonstrate that the architectural parameters of core-shell comb-like chains have a...     

铕掺杂的一维钛氧簇合物Ti4Eu2O4(OOCC6H5)14的制备、晶体结构及表征

采用完全羧基配位和铕离子掺杂钛氧簇策略,通过溶剂热法制备得到单晶Ti₄Eu₂O₄（OOCC₆H₅）₁₄（记为POTi₄Eu₂）。通过元素分析、热重分析、固态紫外可见吸收光谱、红外光谱等技术对POTi₄Eu₂进行表征,通过液相荧光光谱和固态荧光寿命等技术来研究其光学性质。POTi₄Eu₂结构包含4个TiO₆八面体、2个EuO₈十二面体和14个桥联的二齿苯甲酸配体。簇核Ti₄Eu₂是由14个苯甲酸配体稳定的,14个苯甲酸配体均采用双齿桥配位,分布于钛氧簇的核簇四周,相邻的簇之间通过苯甲酸配体桥联,形成一维链结构。热重分析数据显示单晶POTi₄Eu₂的结构在空气中256℃以内可以保持稳定。单晶POTi₄Eu₂的平均荧光寿命为1.63 ms。     

Preparing a Fast Pauli Decomposition for Variational Quantum Solving Linear Equations

Solving linear equations is a basic and significant mathematical task, and it can be executed by variational quantum algorithm (VQA) with quantum advantages by leveraging near-term quantum device and classical optimizer. In the above algorithm, the coefficient matrix should be decomposed first but slowly with the traditional method, for realizing an effective quantum circuit. In this paper, a general framework for preparing a fast Pauli decomposition for solving arbitrary linear equations using VQA is proposed. This method has a simpler form and reduces the complexity of matrix decomposition compared with the traditional one. Moreover, the concrete tables of two and three qubits cases are given for looking up quickly and the instances of Toeplitz matrix, Yule–Walker, and arbitrary equations are demonstrated. Finally, numerical simulations are given to verify this method. This work provides a more convenient and faster preparatory phase for solving linear equations using VQA.     

双酸位SO_4~(2-)/ZrO_2-SiO_2固载离子液体催化剂的构筑及性能

采用一步共缩合-水热法合成酸性载体SO_4~(2-)/ZrO_2-SiO_2,化学法接枝酸性离子液体磺酸功能化咪唑硫酸氢盐([Ps-im]HSO4),构筑拥有Br觟nsted与Lewis双酸位的离子液体固载型催化剂SO_4~(2-)/ZrO_2-SiO_2-IL。采用X射线衍射、傅里叶红外、N2吸附-脱附、X射线光电子能谱、热重以及透射电镜对催化剂的结构进行表征,结果表明:锆原子和酸性结构SO42-被成功引入纯硅材料,所合成的载体具有一定酸性;离子液体成功固载于酸性介孔材料SO_4~(2-)/ZrO_2-SiO_2,且固载后的催化剂保持其介孔结构。以大豆油和甲醇的酯交换反应为探针,考察了SO_4~(2-)/ZrO_2-SiO_2-IL催化剂的催化性能。在反应温度为150℃、反应时间为4 h、催化剂量5%(w/w)、醇油物质的量之比为24∶1的反应条件下,生物柴油的收率超过92%,且回收利用5次后,生物柴油的收率仍达86%。     

0.9~1.0μm近红外连续光纤激光器的研究进展

波长为0.9~1.0μm的近红外连续光纤激光器在高功率蓝光和紫外激光产生、高功率单模泵浦源、生物医学以及激光雷达等领域具有重要的应用前景,成为近年来的一个研究热点。目前,0.9~1.0μm光纤激光器的增益机制主要有稀土离子增益和非线性效应增益,本文详细梳理了基于这两类增益机制的0.9~1.0μm连续光纤激光器的研究进展,并深入分析了各类激光器存在的技术瓶颈及解决途径,最后对0.9~1.0μm光纤激光器的发展趋势和应用前景进行了展望。     

ZnO纳米棒阵列/纳米颗粒团聚复合膜的制备及其光电性能

采用恒温水浴法在FTO导电玻璃上制备出了ZnO纳米棒阵列,然后对其进行二次生长后得到了ZnO纳米棒阵列/纳米颗粒团聚复合膜,最后它们分别与Pt形成对电极并与电解质溶液组装成染料敏化太阳能电池(DSSC)。结果表明:当在模拟太阳光照射(AM 1.5,100 mW/cm2)下时,ZnO纳米棒阵列/纳米颗粒团聚复合膜太阳能电池的短路电流密度Jsc为11.7 mA/cm2,开路电压Voc为0.661 V,填充因子FF为0.384,光电转换效率为3.17%,均明显的高于ZnO纳米棒阵列太阳能电池和ZnO纳米颗粒团聚球太阳能电池。其主要原因是由于ZnO纳米棒阵列/纳米颗粒团聚复合膜染料敏化太阳能电池在具有较高的光生电子传输效率的同时,增加了比表面积和提高了光子的收集效率。     

荧光光谱法快速测定餐巾纸中的可迁移荧光增白剂

建立餐巾纸中可迁移荧光增白剂含量测定的荧光光谱法.在模拟人体温37℃的实验温度下,在餐巾纸中加入一定体积的二次去离子水,通过静置和振荡两种不同的萃取方式处理后,用荧光光谱法测定可迁移荧光增白剂含量.测定线性方程:y=1.564x+0.054,R2=0.9946,检出限为0.30μg/g,RSD为0.6％-9.8％.该法灵敏度高,且简单、快捷,适用于餐巾纸中可迁移荧光增白剂含量的快速测定.     

Oxalactam A,a Novel Macrolactam with Potent Anti-Rhizoctonia solani Activity from the Endophytic Fungus Penicillium oxalicum

A novel macrolactam named oxalactam A (1), three known dipeptides (2–4) as well as other known alkaloids (5–7) were obtained from the endophytic fungus Penicillium oxalicum, which was derived from the tuber of Icacina trichantha (Icacinaceae). All chemical structures were established based on spectroscopic data, chemical methods, ECD calculations, and ¹³C-DP4+ analysis. Among them, oxalactam A (1) is a 16-membered polyenic macrolactam bearing a new skeleton of 2,9-dimethyl-azacyclohexadecane core and exhibited potent anti-Rhizoctonia solani activity with a MIC value of 10 μg/mL in vitro. The plausible biosynthetic pathway of 1 was also proposed via the alanyl protecting mechanism. Notably, three dipeptides (2–4) were first identified from the endophytic fungus P. oxalicum and the NMR data of cyclo(L-Trp-L-Glu) (2) was reported for the first time. In addition, the binding interactions between compound 1 and the sterol 14α-demethylase enzyme (CYP51) were studied by molecular docking and dynamics technologies, and the results revealed that the 16-membered polyenic macrolactam could be a promising CYP51 inhibitor to develop as a new anti-Rhizoctonia solani fungicide.     

Scalar-pseudoscalar pair production at the Large Hadron Collider at NLO+NLL accuracy in QCD

We thoroughly investigate both transverse momentum and threshold resummation effects on scalar-pseudoscalar pair production via quark-antiquark annihilation at the \begin{document}$ 13 \; \text{TeV}$\end{document} Large Hadron Collider at QCD NLO+NLL accuracy. A factorization method is introduced to properly supplement the soft-gluon (threshold) resummation contribution from parton distribution functions to the resummed results obtained by the Collins-Soper-Sterman resummation approach. We find that the impact of the threshold-resummation improved PDFs is comparable to the resummation effect of the partonic matrix element and can even predominate in high invariant mass regions. Moreover, the loop-induced gluon-gluon fusion channel in the type-I two-Higgs-doublet model is considered in our calculations. The numerical results show that the electroweak production via quark-antiquark annihilation dominates over the gluon-initiated QCD production by \begin{document}$ 1 \sim 2$\end{document} orders of magnitude.