The arc length variational formula on the exponential manifold

In this paper, we mainly consider the first and second arc length variational problems on the exponential statistical manifold, and give the variational formulae.     

Perturbation of systems of linear algebraic equations

A classical perturbation result for nonsingular systems of linear algebraic equations is extended to general consistent systems under any norm. An optimal perturbation result is also obtained for general linear least squares problems under a Euclidean norm.     

Preparation of La-Ti Composite Oxide Nanocrystal and Examination of Their Surface Topography with Atomic Force Microscope

Atomic force microscope (AFM) is a kind of scanning probe microscope (SPM) derived from scanning tunnel microscope (SCM)1,2. Enjoying such advantages as simple preparation of sample and nanometric differentiation scale 3, AFM is greatly welcome in chemistry, material and biology science research4~7. Composite oxides containing rare-earth element and transitional metal such as titanium as the third element enjoy many promising applications owning to their excellent physical and chemical pr…     

Synthesis,structure and photoluminescence of a 3D pillared heterometallic coordination polymer containing 2D inorganic cadmium‐potassium‐oxide layer subunits

Self‐assembly of Cd(NO₃)₂ with o ‐phthalic acid monopotassium salt (KHphth) in the presence of ethylenediamine (en) produced a new heterometallic coordination polymer [CdK₂(phth)₂(en)_0.5(H₂O)]_n ( 1 ). Single‐crystal X‐ray analyses reveal that it crystallizes in a monoclinic space group P 2₁/c. a = 11.6707(6) Å, b = 8.1019(4) Å, c = 20.9503(11) Å, β = 94.6640(10)^o. The complex displays an en‐pillared 3D framework, which is constructed from 2D [CdK₂(phth)₂(H₂O)]_n layers featuring uncommon inorganic cadmium‐potassium‐oxide layers containing potassium‐oxide layers. In the solid state, complex 1 shows photoluminescence with the maximum emission intensities at 355 nm upon excitation at 312 nm. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

用于超级电容器的锰钴氧化物/碳纤维材料

The development of high-performance supercapacitor electrode materials is imperative to alleviate the ongoing energy crisis. Numerous transition metals (oxides) have been studied as electrode materials for supercapacitors owing to their low cost, environmental-friendliness, and excellent electrochemical performance. Among the developed binary transition metal oxides, manganese cobalt oxides typically show high theoretical capacitance and stable electrochemical performance, and are widely used in the electrode materials of supercapacitors. However, the poor conductivity and active material utilization of manganese cobalt oxide-based electrode materials limit their potential capacitance application. Cotton is mainly composed of organic carbon-containing materials, which can be transformed to carbon fibers after calcination. The resultant carbonaceous material exhibits a large specific surface area and good conductivity. Such advantages could potentially suppress the negative effects caused by the poor conductivity and small specific surface area of manganese cobalt oxides, thereby improving the electrochemical performance. Herein, we firstly deposited manganese cobalt oxides on cotton by a simple hydrothermal method, yielding a composite of manganese cobalt oxides and carbon fibers via subsequent calcination, to improve the electrochemical performance of the electrode material. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), thermogravimetric analysis (TGA), and electrochemical characterizations were used to investigate the physical, chemical, and electrochemical properties of the prepared samples. The fabricated manganese cobalt oxides in the composite were uniformly dispersed on the carbon fiber surface, which increased the contact between the interface of the electrode material and electrolyte, and enhanced electrode material utilization. The electrode material was confirmed to have well contacted with the electrolyte during a contact angle test. Hence, a pseudo-capacitance reaction completely occurred on the manganese cobalt oxide material. Moreover, the addition of carbon fibers reduced the resistance of the material, resulting in excellent capacitive performance. The capacitance of the prepared composite was 854 F∙g^-1 at a current density of 2 A∙g^-1. The capacitance was maintained at 72.3% after 2000 cycles at a current density of 2 A∙g^-1. These results indicate that the manganese cobalt oxide and carbon fiber composite is a promising electrode material for high-performance supercapacitors. The findings presented herein provide a strategy for coupling with carbon materials to enhance the performance of supercapacitor electrode materials based on manganese cobalt oxides. Thus, novel insights into the design of high-performance supercapacitors for energy management are provided.     

STRUCTURE OF VERSICOLACTONE A,A NOVEL SESQUITERPENE LACTONE FROM ARISTOLOCHIA VERSICOLAR S.M.HWANG

A novel sesquiterpene tactone,versicolactone A,with 12-carbonring skeleton,has been isolated from the roots of Aristolochia versicolarS.M.Hwang,and the structure was elucidated on the basis of 2D NMR and MSspectral data.     

刺槐花中的营养成分

用现代仪器对刺槐花中蛋白质，糖，抗坏血酸，酶值，氨基氮及微量元素等营养成分进行了测试，对基营养价值进行了初步分析。     

Synthesis of organic one-dimensional nanomaterials by solid-phase reaction

The synthesis of anthracene (AN) nanowires and perylene (PY) nanorods on the basis of solid-phase organic reactions under controlled conditions is discussed, and the structures are confirmed by SEM, TEM, and XRD. The dimension-dependent emission properties of the AN nanowires and PY nanorods is observed. This approach is expected to form a new general route for the controlled morphosynthesis of organic molecular materials in restricted dimensions, with controlled size and shape, the solid-state physical properties of which are of great interest. It should have outstanding potential in providing customized 1D nanomaterials for a broad range of applications for molecule devices and nanoscience and is expected to be applicable other functionalized nanomaterials (i.e., organic, inorganic, and polymer).