双层介质光线散射效果的实时绘制

实时绘制光线散射效果是计算机图形学中的一个难点.利用光线散射的特性,提出一种多项式近似的方法;通过解析双层介质光线散射公式,能实现实时地绘制双层介质中不同光源分布、不同介质特性下的光线散射效果.     

Facile Synthesis of Porous NiO Nanofibers for High-Performance Supercapacitors

The porous NiO nanofibers have been successfully synthesized by a simple process of hydrothermal treatment with subsequent calcination. The as-prepared porous NiO nanofibers, when applied as supercapacitor electrode exhibited a higher specific capacitance of 884 F/g with enhanced rate capability and good cycle stability. The excellent capacitive behaviors are mainly attributed to their unique configurations, which can not only provide high specific surface area but also greatly enhance the effective utilization of active materials as well as rapid ion/electron transportation. It is expected that such intriguing NiO porous nanofibers can serve as promising electrode materials for high-performance supercapacitors.     

改性SiOx/WPU涂膜对腐败希瓦氏菌生物被膜的抑制作用

为获得对水产品中腐败希瓦氏菌生物被膜具有优良抑制性能的水性聚氨酯(WPU)涂膜，以不同微观形貌的SiOx微纳米粒子为粗糙度构建因子，采用滴涂法制备SiOx/WPU涂膜，测定改性SiOx/WPU涂膜表面的疏水疏油性能、表面能、微观形貌和热稳定性能，揭示改性SiOx/WPU涂膜对腐败希瓦氏菌生物被膜的抑制机制。结果表明，以十六烷基三甲基溴化铵(CTAB)改性的SiOx颗粒为粗糙度构建因子制备的C-SiOx/WPU涂膜，尽管表面氟含量最高，但其水和正十六烷接触角分别为139.0°±3.5°和0°，仅表现为疏水超亲油性，热稳定性和抗细菌黏附性最差；改性气相纳米SiOx/WPU涂膜表现为超疏水超亲油性，热稳定性最好，且可以抑制腐败希瓦氏菌的初期黏附；以改进的St?觟ber法在同一溶剂体系中制备和改性SiOx微纳米粒子为粗糙度构建因子制备的改性微米级SiOx/WPU涂膜为超双疏表面，热稳定性较高，对腐败希瓦氏菌不可逆黏附的抑制最好，可有效降低生物被膜的代谢活性，减少胞外多糖(EPS)的分泌，培养24 h后其表面刚开始形成微菌落。本研究的超双疏性改性微米级SiOx/WPU涂膜可用于制备食品包装材料，为抗生物被膜材料在食品包装领域的应用提供技术支持。     

机械活化对Al-Ti-C粉料合成反应激活能的影响

对经不同时间高能球磨的Ａｌ－Ｔｉ－Ｃ粉料混合物，采用差热分析和Ｘ射线衍射相结合的方法，确定合成反应过程中所发生的反应形式，并根据各反应峰的图形计算各反应的激活能。结果表明，高能球磨时间愈长，合成反应的激活能愈低，尤其是对于温度较低时所发生的合成反应，高能球磨时间对激活能的影响更为显著。     

改性HDI产品中游离HDI含量及各官能度分布的测定方法

介绍了用凝胶渗透色谱法(GPC)测定改性六亚甲基二异氰酸酯(HDI)样品官能度分布的方法,完成了样品衍生条件的探索研究,以及改性HDI不同官能度组分的定性定量测试。该测试方法可将改性HDI中游离的HDI和官能度为3、4、5及以上的组分进行较好的分离,并定量给出各组分峰面积相对百分含量。测定结果重现性较好,偏差均在1.0%以下。     

基于非洲本土文化的在地性建构策略初探——以援刚果(金)中部非洲国家文化艺术中心建筑创作实践为例

以援刚果(金)中部非洲国家文化艺术中心项目创作实践为例,强调深度发掘场地特质以及与场地相关的特殊因素,并综合考虑建筑与地区气候生态环境、地方文化、场所文脉、建造技艺、使用体验等方面的相互关系,从城市场所文脉、地域自然文脉及建造的诗意性三个方面探索基于非洲本土文化的在地实践策略.     

Experimental and Theoretical Investigations on the Supermolecular Structure of Isoliquiritigenin and 6-O-α-d-Maltosyl-β-cyclodextrin Inclusion Complex

Isoliquiritigenin (ILTG) possesses many pharmacological properties. However, its poor solubility and stability in water hinders its wide applications. The solubility of bioactive compounds can often be enhanced through preparation and delivery of various cyclodextrin (CD) inclusion complexes. The 6-O-α-d-maltosyl-β-CD (G₂-β-CD), as one of the newest developments of CDs, has high aqueous solubility and low toxicity, especially stable inclusion characteristics with bioactive compounds. In this work, we for the first time construct and characterize the supermolecular structure of ILTG/G₂-β-CD by scanning electron microscopy (SEM), ultraviolet-visible spectroscopy (UV), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffractometry (XRD). The solubility of ILTG in water at 25 °C rises from 0.003 to 0.717 mg/mL by the encapsulation with G₂-β-CD. Our experimental observations on the presence of the ILTG/G₂-β-CD inclusion complex are further supported by the ONIOM(our Own N-layer Integrated Orbital molecular Mechanics)-based QM/MM (Quantum Mechanics/Molecular Mechanics) calculations, typically substantiating these supermolecular characteristics, such as detailed structural assignments, preferred binding orientations, selectivity, solvent effects, interaction energies and forces of the ILTG/G₂-β-CD inclusion complex. Our results have elucidated how ILTG interacts with G₂-β-CD, demonstrating the primary host-guest interactions between ILTG and G₂-β-CD, characterized by hydrogen bonds, hydrophobic interactions, electrostatic forces, and conformational effects, are favored for the formation of the ILTG/G₂-β-CD inclusion.     

掺氟氧化锡(SnO_2:F)纳米粉末的制备

以SnCl4.5H2O、氨水和HF酸为主要原料,用化学方法制取了掺氟氧化锡(FTO)纳米粉末。用XRD、SEM分别研究了FTO粉末的相结构和形貌,用比表面仪测定了粉末比表面积,同时测试了FTO粉末的电阻率。结果表明:FTO粉末是四方晶系金红石结构;在500℃下焙烧制取的粉末电阻率最低,为50?.m,比表面积为61.00m2/g。采用无水酒精球磨分散等步骤,可有效防止粉末团聚。