HAMILTONIAN SYSTEM AND SIMPLETIC GEOMETRY IN MECHANICS OF COMPOSITE MATERIALS (Ⅱ)——PLANE STRESS PROBLEM

Fundamental theory presented in Part (I)^[8] is used to analyze anisotropic plane stress problems. First we construct the generalized variational principle to enter Hamiltonian system and get Hamiltonian differential operator matrix; then we solve eigen problem; finally, we present the process of obtaining analytical solutions and semi-analytical solutions for anisotropic plane stress problems on rectangular area.     

Synthesis and Crystal Structure of Two Diflunisal Carboxamides

Graphical abstract  

The title compounds, 2′,4′-difluoro-4-[(4-methylbenzoyl)oxy]-N-[4-nitro-3-(trifluoromethyl)phenyl]-[1,1′-biphenyl]-3-carboxamide 2a and 2′,4′-difluoro-4-[(4-chlorobenzoyl)oxy]-N-[4-nitro-3-(trifluoromethyl) phenyl]-[1,1′-biphenyl]-3-carboxamide 2b, synthesized from diflunisal, a registered anti-inflammatory drug, via amidation of carboxlic acid and esterification of phenolic hydroxy group, were confirmed by single- crystal X-ray diffraction showing their packing are stabilized by intermolecular hydrogen bonds      

立方氮化硼薄膜的气相沉积及过渡层对其附着性能的影响

本文采用非平衡磁控溅射物理气相沉积工艺，在单晶硅基片上合成了立方氮化硼薄膜，并且通过采用过渡层提高了立方氮化硼薄膜的附着力，过渡层分别是碳化硼(B4C)薄膜以及碳化硼(B4C)薄膜与B-C—N梯度层的复合层(B4C／B—C—N)。同时，不同过渡层的存在使立方氮化硼薄膜的剥落机理产生变化。     

与星象函数有关的拟共形近于凸调和映射

讨论了一类解析部分为星象函数的拟共形近于凸调和映射的基本性质,得到了此类映射的系数不等式、积分表达式、增长定理、面积定理与部分和的近于凸半径.     

Concise total synthesis of AB5046A and AB5046B

Two naturally occurring rare 5-oxo β-triketones, AB5046A and AB5046B, were efficiently synthesized in five linear steps with overall yields of 36% and 28%, respectively. The synthetic strategy highlighted the readily preparation of the key intermediate, 3-ethoxy-5-hydroxycyclohex-2-enone, from commercially available phloroglucinol.     

Red-emitting salicylaldehyde Schiff base with AIE behaviour and large Stokes shift

Three salicylaldehyde Schiff base (SSB) with AIE behavior were designed and facilely synthesized through a condensation reaction. In solid and aggregation states, these SSB dyes exhibited yellow to red emission with large Stokes shift. One of SSB dyes could specifically stain lipid droplets in living cells.     

Characterization of Disulfide-Linked Peptides Using Tandem Mass Spectrometry Coupled with Automated Data Analysis Software

Disulfide bond formation is critical for maintaining structure stability and function of many peptides and proteins. Mass spectrometry has become an important tool for the elucidation of molecular connectivity. However, the interpretation of the tandem mass spectral data of disulfide-linked peptides has been a major challenge due to the lack of appropriate tools. Developing proper data analysis software is essential to quickly characterize disulfide-linked peptides. A thorough and in-depth understanding of how disulfide-linked peptides fragment in mass spectrometer is a key in developing software to interpret the tandem mass spectra of these peptides. Two model peptides with inter- and intra-chain disulfide linkages were used to study fragmentation behavior in both collisional-activated dissociation (CAD) and electron-based dissociation (ExD) experiments. Fragments generated from CAD and ExD can be categorized into three major types, which result from different S–S and C–S bond cleavage patterns. DiSulFinder is a computer algorithm that was newly developed based on the fragmentation observed in these peptides. The software is vendor neutral and capable of quickly and accurately identifying a variety of fragments generated from disulfide-linked peptides. DiSulFinder identifies peptide backbone fragments with S–S and C–S bond cleavages and, more importantly, can also identify fragments with the S–S bond still intact to aid disulfide linkage determination. With the assistance of this software, more comprehensive disulfide connectivity characterization can be achieved.

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A new correlation between the characteristics temperature and glass-forming ability for bulk metallic glasses

Journal of Thermal Analysis and Calorimetry - A new criterion or parameter χ given by $$\left( {\frac{{T_{\text{x}} - T_{\text{g}} }}{{T_{\text{l}} - T_{\text{x}} }}} \right) \times \left(...     

Trueness verification survey for blood lead concentration measurement in Chinese clinical laboratories

Accreditation and Quality Assurance - The results of trueness verification for blood lead measurement were analyzed in a 2016 nationwide external quality assessment (EQA) survey, in order to...