Three new Anthraquinones,one new Benzochromene and one new Furfural glycoside from Lasianthus acuminatissimus

Three new anthraquinones, lasianthurin B (1), C (2), lasianthuoside D (3), a new benzochromene, lasianthurin D (4), and a new furfural glycoside, lasianthuoside E (5), together with one known compound 4- hydroxymethyl-2-furaldehyde (6) were isolated from an alcohol extract of the root of Lasianthus acuminatissimus. Their structures were elucidated on the basis of extensive spectroscopic data analysis (including 1D, 2D NMR, X-ray, and MS experiments) and comparsion to literature data.     

Green synthesis and application of nanoscale zero-valent iron/rectorite composite material for P-chlorophenol degradation via heterogeneous Fenton reaction

A zero-valent iron/rectorite nanocomposite (NZVI/rectorite) was developed as a heterogeneous H₂O₂ catalyst for P-chlorophenol degradation. The physicochemical properties of NZVI/rectorite were characterized by various techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive spectrometry, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. Results showed that NZVI sphere nanoparticles were successfully loaded on the rectorite surface with less aggregation and good dispersion. Moreover, compared with acid-leached rectorite (30.91 m²/g), the NZVI/rectorite appeared to have larger surface area (50.75 m²/g). In addition, the effects of pH, reaction time, initial P-chlorophenol concentration, catalyst amount, and H₂O₂ dosage on the P-chlorophenol degradation were systematically investigated. Results showed that NZVI/rectorite presents better properties for the degradation and mineralization of P-chlorophenol compared with pristine NZVI due to the large surface area, low aggregation, and good dispersion of the former. The degradation mechanisms of P-chlorophenol by NZVI/rectorite were adsorption and reduction coupled with a Fenton-like reaction. Four successive runs of the stability and regeneration study also showed that the NZVI/rectorite were unchanged even after 100% of P-chlorophenol degradation ratio. This study has extended the application of NZVI/rectorite as environment function material for the removal of P-chlorophenol from the environment.     

EFFECT OF THE SUBSTITUTION OF Ga AND Sn FOR Cu ON THE ELECTRONIC STRUCTURE AND SUPERCONDUCTIVITY OF La1.85Sr0.15CuO4

The electronic structure of La_1.85Sr_0.15CuO₄， as well as the two cases of substitution of Ga and Sn for Cu, has been studied by the recursion method. The change of hole concentration and the effective local magnetic moment have also been calculated. Our calculations show that Ga and Sn destroy the two-dimensional character of the CuO₂ plane and lead to the disorder of the electronic structure, accompanied by the migration of electrons which canines the decrease of the hole concentration in the CuO₂ planes. From our point of view, these changes may be responsible for the destruction of superconductivity of the Ga and Sn-doped systems.     

NiFeNb种子层对坡莫合金磁滞回线的影响

以NiFeNb为种子层，制备(Ni₇₉Fe₂₁)_1-xNb_{x(5nm)/(Ni79Fe21) (20nm)/Ta(3nm)系列膜，并对其颗粒大小、 磁滞回线及表面粗糙度等进行测量，探讨种子层中Nb含量x对坡莫合金磁滞回线的影响.结果 表明，以NiFeNb作种子层能更好地改善坡莫合金的微结构. Nb含量为23％时的磁滞回线有最 小的最大磁能积、矫顽力.种子层影响坡莫合金磁滞回线的一个重要原因是脱附激活能等因 素造成种子层具有不同的表面粗糙度，进而使坡莫合金具有不同的微结构和磁性能. 关键词： NiFeNb种子层 坡莫合金 磁滞回线 粗糙度}     

关联分析的方法及应用

提出了根据采集的数据来分析其关联程度的方法 .     

关于非线性Davey-Stewartson方程的散射理论

本文讨论具有三个非线性项的Davey-Stewartson方程的散射算子在整个能量空间H~1中存在。     

类镍铱离子光谱跃迁研究

重元素高电离的离子特性对研究激光核聚变和Ｘ射线激光等都很重要，本文用３ｄ＾９４ｓ，３ｄ＾９４ｄ，３ｄ＾９４ｐ，３ｄ＾９４ｆ组态相互作用研究了类镍铱离子光谱跃迁。     

一类非线性四阶椭圆型方程的极值原理及其特征值问题

主要应用 Hopf极值原理 ,对一类非线性四阶椭圆型方程Δ2 u +h( x,u,Δu) =0进行研究 ,得到解的泛函的极值原理 .类似的文章结果也有许多 ,其方法均为构造适当的“P-泛函”,但是以前的结果都对方程有较强的要求限制 .本文通过构造新的泛函 ,减弱了要求限制 .同时对方程Δ2 u +λh( x,u,Δu) =0的特征值给出了估计 .     

Nd^3＋：YAlO3晶体折射率温度系数的表示式

建立了Nd~(3+):YAlO_3(Nd:YAP)晶体折射率温度系数的表示式,该式得到的结果与测量值间具有较好的一致性。利用这个式子可以计算0.5398μm～1.0795μm波长范围311K～455K温度范围内Nd:YAP晶体的折射率温度系数。