REE bound polysaccharides in leaves of Dicranopteris dichotoma by MAA

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涡激诱导并列双圆柱碰撞数值模拟研究

圆柱类结构物的涡激振动是工程中较为常见的一种现象,如果圆柱结构物之间的距离较小, 就会产生涡激诱导碰撞现象,而涡激碰撞会比涡激振动对结构物疲劳破坏产生更严重的威胁.采用浸入边界法模拟流体中的动边界问题,避免了传统贴体网格方法在求解流体中存在固体间碰撞问题时出现数值求解不稳定问题,采用有限元方法对圆柱的运动和碰撞进行求解,通过数据回归方法建立了流体流动条件下的润滑模型,对不同间隙比下涡激诱导并列双圆柱振动及碰撞过程进行了数值模拟, 数值结果表明,如果两圆柱产生了碰撞将会有连续的碰撞发生, 碰撞时出现了多阶频率,振动主频率要比无碰撞时大, 两圆柱碰撞时的相对速度比自由来流速度小;当两圆柱相互接近时, 随着涡环分离角度的逐渐倾斜, 横向流体力先逐渐减小,当两圆柱间涡环开始相互影响发生挤压时, 横向流体力开始逐渐增大;当两圆柱开始反弹时, 两圆柱间形成了低压区, 改变了横向流体阻力的方向,使两圆柱又产生了接近运动,如此反复从而产生了碰撞后横向流体力和圆柱速度的振荡现象.      

β—环糊精键合固定相合成方法和色谱性能研究

以两种不同的路线合成β－环瑚精－环氧丙氧丙基键合硅胶固定相（β＿ＣＤ－ＧＰＳ）。比较了两种方法得到的键合相的键合量。采用非水滴定法考察了影响键合反应的因素。选择了合成β＿ＣＤ－ＧＰＳ最佳反应条件，并对其色谱性能进行了考察。     

Identification and quantification of benzimidazole metabolites of thiophonate-methyl sprayed on celery cabbage using SiO2@NiO solid-phase extraction in combination with HPLC-MS/MS

Thiophonate-methyl(TPM) is one of fungicides and pesticides widely used in agriculture field.However,the residue of its benzimidazole(BZD) metabolites in related agricultural products poses a potential risk to consumers.In this paper,nickel oxide nanoparticle-deposited silica(SiO_2@NiO) composite was used for the selective enrichment and purification of TPM's BZD metabolites in celery cabbage sprayed with TPM.Meanwhile,high-performance liquid chromatography coupled with precursor ion scan-mass spectrometry(HPLC-PIS-MS) and high-resolution MS/MS analysis(HR-MS/MS) was utilized for their qualitative and quantitative analysis.Twenty-one potential TPM's BZD metabolites were found and four of them were identified.One metabolite was discovered for the first time.Besides,a robust and sensitive quantitative method was developed with good linearities(R^2> 0.9972) within a wide range of 10.00-1000 ng/g.The detection limits of three known TPM's metabolites were within the range of 3.20-4.90 ng/g.Relative standard deviations(RSDs) of intra-day and inter-day precisions were less than 18.3%,which showed perfect reproducibility.The method was successfully applied to monitoring TPM's BZD metabolites in celery cabbage sprayed with TPM and the concentration versus time curves of TPM's metabolites in celery cabbage were plotted.This method is expected to be used to monitor BZD residues in various fruits and vegetables.     

碱基在十二胺-N,N-二亚甲基膦酸改性氧化锆固定相上色谱行为的研究

研究了碱基在十二胺-N,N-二亚甲基膦酸(DDPA)改性氧化锆固定相（DPZ）上的色谱保留行为,考察了流动相中甲醇含量、流动相pH值、缓冲溶液中离子类型和离子强度对碱基保留的影响,对DDPA在氧化锆表面的吸附方式进行了研究。研究结果表明,DDPA仅以一个膦酸基与氧化锆结合,因而DPZ固定相表面上除了有长链的疏水烷基外,还有酸性的膦酸基和碱性的氨基。碱基分子中也存在氨基和酰胺基等极性基团,因此碱基在DPZ固定相上除了有疏水作用外,还具有电荷排斥作用、离子交换作用等多种保留机理。由于多种保留机理的存在,使得碱基在DPZ固定相上具有较好的分离选择性,在酸性条件下对碱基混合样品的分离取得了满意的结果。     

超音速氧碘化学激光实验研究

在一台５ｋＷ超音速氧碘化学激光器装置上采用转网式单重态氧发生器，在Ｃｌ２流量为１５０ｍｍｏｌ／ｓ时输出功率已超过１ｋＷ。     

Polymeric microcapsules with internal cavities for ultrasonic imaging: efficient fabrication and physical characterization

Polymeric microcapsules are of great potential in ultrasonic imaging due to their characteristic hollow structure. Water-in-oil-in-water (W₁/O/W₂) double emulsion-solvent evaporation technique is a versatile strategy applicable to most hydrophobic polymers for fabricating microcapsules; however, the adjustment of the size and inner structure of resultant microcapsules have not been systematically studied until now. Here, we evaluate in detail the parameters in double emulsification and find that the W₁/O volume ratio is a pivotal parameter which controls the hollow structure of microcapsules. In addition, an appropriate concentration of emulsifier in W₂ is essential to guarantee the hollow structure as well. For quantitatively characterizing the hollow structure of microcapsules, we propose the concept of Hollow Ratio (HR) and Hollow Degree (HD) to evaluate the percent of hollow microcapsules in products and the hollow characteristic of the microcapsules. Our study demonstrates that the HR of microcapsules can vary between 25% and 98% by only adjusting the W₁/O volume ratio. The size of microcapsule has a close relationship to its HD. Moreover, the microcapsules with both single cavity and multicavities have been fabricated by altering the energy of the second emulsification. Further, acoustic studies reveal that the microcapsules with different HD display obviously different sound attenuation spectrum and resonance frequency, which demonstrates that the adjustment of hollow structure should be an effective approach to control the acoustical properties of microcapsules for ultrasonic imaging.     

Design and analysis of optically pumped semiconductor VECSEL with ANECz optical control layer

Through the reversible isomerization of trans-cis-trans under the linear polarization light, the molecules of azo materials have the same tropism which is vertical to the polarization of light. This means that azo materials have photo-induced birefringence which is related to optical power and polarization angle of the light. Based on the photo-induced birefringence of azo materials, we design a new type of optically pumped semiconductor vertical external cavity surface emitting laser （OPS-VECSEL） which can control the polarization and frequency of the ejection laser. The functional molecules of azo materials are [3-azo- （4＇nitro）]- （9-ethyl）-carbazole （ANECz）.     

The construction of orthodox super rpp semigroups

We define orthodox super rpp semigroups and study their semilattice decompositions. Standard representation theorem of orthodox super rpp semigroups whose sub-band of idempotents is in the varieties of bands described by an identity with at most three variables are obtained.     

杯芳烃在液相色谱、毛细管电泳和电色谱中的应用进展

利用杯芳烃的分子识别作用提高色谱分离选择性是超分子化学在分离科学中的成功应用.本文从杯芳烃分离材料的制备、分离机理和应用等,综述了近年来杯芳烃在液相色谱、毛细管电泳和电色谱中的研究进展.