高效液相色谱-三重四极杆质谱法同时测定羊栖菜5个部位中10种植物激素含量

采用高效液相色谱-三重四极杆质谱（HPLC-TQMS）,建立了同时分析羊栖菜主分枝、侧分枝、初生叶、次生叶、茎等5个部位中吲哚乙酸、异戊烯腺苷、异戊烯腺嘌呤、反式玉米素核苷、玉米素、独角金内酯、脱落酸、水杨酸、赤霉素、茉莉酸等10种植物激素含量的方法。羊栖菜样品经冷冻干燥后,用甲醇/水/甲酸（15：4：1,v/v/v）（含0.5% BHT）超声提取植物激素,在Hypersil Gold C18色谱柱上,以甲醇和水为流动相进行梯度洗脱,采用电喷雾电离,正/负离子扫描选择反应监测模式进行定量分析。结果表明,10种植物激素在线性范围内的相关系数（r）为0.9989~1.0000;检出限为0.0012~4.6512 μg/L;加标回收率在72.24%~91.31%之间,相对标准偏差均不高于6.59%;在羊栖菜5个部位鲜样中10种植物激素的含量范围为未检出至4041.431 ng/g。本方法具有良好的灵敏度、精密度和回收率,可以用于同时分析多种植物激素。     

A Multi-Classification Hybrid Quantum Neural Network Using an All-Qubit Multi-Observable Measurement Strategy

Quantum machine learning is a promising application of quantum computing for data classification. However, most of the previous research focused on binary classification, and there are few studies on multi-classification. The major challenge comes from the limitations of near-term quantum devices on the number of qubits and the size of quantum circuits. In this paper, we propose a hybrid quantum neural network to implement multi-classification of a real-world dataset. We use an average pooling downsampling strategy to reduce the dimensionality of samples, and we design a ladder-like parameterized quantum circuit to disentangle the input states. Besides this, we adopt an all-qubit multi-observable measurement strategy to capture sufficient hidden information from the quantum system. The experimental results show that our algorithm outperforms the classical neural network and performs especially well on different multi-class datasets, which provides some enlightenment for the application of quantum computing to real-world data on near-term quantum processors.     

Loop homology of bi-secondary structures II

Journal of Algebraic Combinatorics - In this paper, we analyze the homology of the simplicial complex induced by a given pair of RNA secondary structures, $$R=(S,T)$$ . Such a pair induces a...     

Perpendicular rutile nanosheets on anatase nanofibers: Heterostructured TiO2 nanocomposites via a mild solvothermal method

A novel hierarchically heterostructured TiO₂ nanocomposite, which consists of rutile nanosheets perpendicular standing on anatase nanofibers, is successfully created through a two-step approach. Firstly, the fibrous anatase TiO₂ framework is fabricated by a facile electrospinning method, then a layer of relative uniform rutile nanosheets grow on the fibers after a mild solvothermal reaction process. This work provides a convenient and effective route for fabricating desired three-dimensional nanocomposite and should be easily extended through to many other materials system.     

A-La2O3电子结构和光学性质的第一性原理计算

采用基于密度泛函理论(DFT)框架下广义梯度近似平面波超软赝势法,计算A-La2O3的电子结构和光学性质.结果表明,A-La2O3,属于间接带隙氧化物,禁带宽度为3.72 eV;其价带主要由La的5s,5p和6s态电子以及O的2s和2p态电子构成,导带主要由La的5d态电子构成.经带隙校正后,计算得到A-La2O3在(100)和(001)方向上的光学线性响应函数随光子能量的变化关系,包括复介电函数、复折射率、吸收光谱、反射光谱、损失函数和光电导谱.结果表明,A-La2O3,在(100)和(001)方向上具有光学各向异性,并且具有从近紫外到红外的透明区域,为A-La2O3,的应用提供了理论依据.     

A novel photoelectric MOSFET with AC output under constant illumination

Traditional photoelectric devices can generate only DC electric signals under constant illumination. In this work, a novel photoelectric metal-oxide-semiconductor field-effect transistor (MOSFET) with AC output under constant illumination is introduced, in which the channel current is modulated by the gate voltage. This virtue can greatly simplify the signal processing circuitry. This photoelectric MOSFET has been successfully fabricated using a standard 0.8 micron MOSFET process.     

First-principles study of structural, optical and elastic properties of cubic HfO2

The structural, optical and elastic properties of cubic HfO₂ were studied using the plane-wave ultrasoft pseudopotential technique based on the first-principles density-functional theory (DFT). The ground-state properties such as lattice parameter and bulk modulus were calculated and these results are in favorable agreement with the previous work. The complex dielectric function, refractive index, extinction coefficient, complex conductivity function, energy-loss spectrum, absorption coefficient and optical reflectivity are calculated and the peak position distributions of imaginary parts of the complex dielectric function have been explained. The calculated elastic properties are consistent with other calculated results.     

A photoluminescent dinuclear phenylquinolyl Ir(II)-Ir(II) complex featuring a μ-η1:η2-phenylquinolyl bridge and an end-on dinitrogen ligand

The synthesis, characterization and photoluminescent properties of a dinuclear Ir complex with a μ-η(1):η(2)-phenylquinolyl bridge and an end-on dinitrogen ligand are reported herein. DFT studies on its electronic structure and photophysical properties are also presented.