智能动画创作系统 PNAI 的研究进展

计算机动画制作是一件十分耗费时间的工作,提高计算机动画的效率是一项重要的研究课题.近几年我们研制的计算机动画生成系统中的3个底层子系统以及其中涉及的方法,为计算机动画生成提供了有效的支持.在场景设计方面,我们提出了基于场景实例和场景设计知识的场景设计方法;在自动摄影中,我们提出了一种基于摄影脚本的摄影方法;在脸部动画方面,我们采用了RBF方法以及利用了一些预先编成的MEL脚本     

Lagrangian surfaces with Legendrian boundary

Science China Mathematics - In this paper, we first introduce a boundary problem for Lagrangian submanifolds, analogous to the problem for free boundary hypersurfaces and capillary hypersurfaces....     

Proportion-based robust optimization and team orienteering problem with interval data

In this paper, a proportion-based robust optimization approach is developed to deal with uncertain combinatorial optimization problems. This approach assumes that a certain proportion of uncertain coefficients in each solution are allowed to change and optimizes a deterministic model so as to achieve a trade-off between optimality and feasibility when the coefficients change. We apply this approach on team orienteering problem with interval data (TOPID), a variant of vehicle routing problem, which has not yet been studied before. A branch and price algorithm is proposed to solve the robust counterpart by using two novel dominance relations. Finally, numerical study is performed. The results show the usefulness of the proposed robust optimization approach and the effectiveness of our algorithm.     

Continuous synthesis for zirconium metal-organic frameworks with high quality and productivity via microdroplet flow reaction

A series of Zr-based metal-organic frameworks were continuously synthesized with high quality and high productivity through microdroplet flow reaction.     

任意流场中稀疏颗粒运动方程及其性质

通过研究和比较稀疏刚性颗凿相对流体运动时所受到的各种人艇力,并考虑在不同流动条件下各作用修正问题从而得到了任意流场中稀疏颗粒运动方程的一般形式,然后分析了该方程的数学性质,采用积分变换方法对该方程的基本形式进行了理论解析,最后探讨了闰物理性质对其运动规律的影响,以及几种典型流场中稀疏颗粒的运动特性,得到了一些有意义的结论     

Field-amplified on-line sample stacking for simultaneous enantioseparation and determination of some beta-blockers using capillary electrophoresis

A capillary electrophoresis method using carboxymethyl-beta-cyclodextrin as the chiral selector and mixture of methanol and ethanol as the organic additive was successfully developed for the simultaneous enantioseparation and determination of six beta-blockers, namely, carteolol, atenolol, sotalol, metoprolol, esmolol and propranolol in this paper. The most suitable running buffer for enantioseparation was found to be the solution of 20 mmol/L NaH(2)PO(4)-Na(2)HOP(4) (pH 5.5) containing 1.5% w/v carboxymethyl-beta-cyclodextrin, 5% v/v methanol and 5% v/v ethanol. Furthermore, field-amplified sample injection as an on-line sample stacking method was developed in order to increase the detection sensitivity. The experimental conditions for both simultaneous enantioseparation and the field-amplified sample injection method had been investigated in detail. Under the optimum conditions, the detection limits (defined as S/N=3) of this method were 0.01, 0.05, 0.05, 0.05, 0.05 and 0.5 microg /mL for (+/-) carteolol, (+/-) atenolol, (+/-) sotalol, (+/-) metoprolol, (+/-) esmolol and (+/-) propranolol, respectively, which were much lower than those of the conventional methods. The enhancement factors were greatly improved by 25-fold for the enantiomers of the beta-blockers except five-fold for (+/-) propranolol. Eventually, the proposed method has been applied for the analysis of human serum sample.     

Fabrication of Pillar-Cage Fluorinated Anion Pillared Metal–Organic Frameworks via a Pillar Embedding Strategy and Efficient Separation of SO2 through Multi-Site Trapping

Flue gas desulfurization is crucial for both human health and ecological environments. However, developing efficient SO₂ adsorbents that can break the trade-off between adsorption capacity and selectivity is still challenging. In this work, a new type of fluorinated anion-pillared metal–organic frameworks (APMOFs) with a pillar-cage structure is fabricated through pillar-embedding into a highly porous and robust framework. This type of APMOFs comprises smaller tetrahedral cages and larger icosahedral cages interconnected by embedded [NbOF₅]²⁻ and [TaOF₅]²⁻ anions acting as pillars. The APMOFs exhibits high porosity and density of fluorinated anions, ensuring exceptional SO₂ adsorption capacity and ultrahigh selectivity for SO₂/CO₂ and SO₂/N₂ gas mixtures. Furthermore, these two structures demonstrate excellent stability towards water, acid/alkali, and SO₂ adsorption. Cycle dynamic breakthrough experiments confirm the excellent separation performance of SO₂/CO₂ gas mixtures and their cyclic stability. SO₂-loaded single-crystal X-ray diffraction, Grand canonical Monte Carlo (GCMC) simulations combined with density functional theory (DFT) calculations reveal the preferred adsorption domains for SO₂ molecules. The multiple-site host–guest and guest-guest interactions facilitate selective recognition and dense packing of SO₂ in this hybrid porous material. This work will be instructive for designing porous materials for flue gas desulfurization and other gas-purification processes.     

EDTA滴定法测定含锌物料中氧化锌

采用氯化铵-氨水体系溶解试样,干过滤后,向移取的滤液中加入氯化钡和硫酸共沉淀铅离子,过滤分离硫酸铅沉淀,向滤液中加人抗坏血酸、氟化钾、硫代硫酸钠等掩蔽剂掩蔽少量干扰元素。在pH=5~6的乙酸-乙酸钠缓冲溶液中,以二甲酚橙为指示剂,用EDTA标准滴定溶液滴定测得结果为氧化锌、水溶性锌和镉合量,扣除由原子吸收光谱法测得的水溶性锌量和镉量,即为氧化锌量。对总氨浓度、氯化铵-氨水浓度比、溶液加入量、搅拌时间、共存离子干扰、精密度等进行了实验,建立了EDTA滴定法测定含锌物料中氧化锌物相的分析方法。实验证明,氧化锌含量在24%~83%时,方法精密度(RSD)为0.25%~0.54%,加标回收率在99%~104%,完全满足含锌物料中氧化锌的测定要求。     

环肽纳米管的应用研究

环肽分子通过主链骨架中C=O和N-H形成分子间网络氢键,以β-片层反平行方式堆积可形成中空管状结构。通过控制环肽的结构和尺寸,或修饰具有不同功能的基团,可获得多种结构和性能的肽纳米管。本文综述了环肽分子自组装成纳米管的应用研究成果。首先介绍了带合适疏水性侧链的环肽纳米管在模拟生物跨膜离子通道方面的实验和理论研究进展,重点论及环肽纳米管的结构、极性和侧链的疏水性等对离子通道传输行为的影响以及分子动力学（MD）模拟研究水通道的进展。进而介绍了环肽纳米管用作生物传感器模板,与功能性（如电性、光学性和磁性）纳米材料合成制备生物传感器的实验研究成果,接着介绍了环肽纳米管作为药物或药物载体潜在的应用前景,特别是在某些抗菌和抗感染药物开发设计中的应用以及环肽在不同极性的环境中自组装过程微观机制的MD模拟研究,最后介绍了环肽纳米管作为模板,制备磁性、电性纳米材料方面的实验和理论研究进展。