组织工程多孔支架制备技术进展

综述了天然或合成生物降解材料为原料的组织工程多孔支架的几种制备方法，包括无纺织物／纤维粘结法、溶液浇铸／粒子洗出法、相分离／冻干法、气体成孔法和三维“印刷”等方法。特别评述了近期组织工程多孔支架研究进展及其在骨、软骨和皮肤等组织修复中的应用。     

A randomized algorithm for natural object colorization

Natural objects often contain vivid color distribution with wide variety of colors. Conventional colorization techniques, on the other hand, produce colors that are relatively flat with little color variation. In this paper, we introduce a randomized algorithm which considers not only the value of target color but also the distribution of target color. In essence, our algorithm paints a color distribution to a region which synthesizes color distribution of a natural object. Our approach models the correlation between intensity and color in HSV color space in terms of H – S, H – V and S – V joint histogram. During the colorization process, we randomly swap and reassign color of a pixel to minimize a cost function that measures color consistency to its neighborhood and intensity‐to‐color correlation captured in the joint histogram. We tested our algorithm extensively on many natural objects and our user study confirms that our results are more vivid and natural compared to results from previous techniques.     

Effect of simulated freeze damage on soybean seed composition and functionality

Two soybean varieties (Beeson and Williams) were harvested at various maturation levels by applying paraquat directly to the growing plant. The application of this herbicide to arrest growth was used to simulate freeze damage. The free fatty content and the photometric index declined from 0.61% to 0.19% and 301.56 to 201.90, respectively, as maturation progressed for the Beeson variety. Similar trends were found with the Williams variety. However, the amount of trypsin inhibitor differed between the two varieties depending upon maturation level.     

南极假丝酵母脂肪酶发酵条件优化及酶学性质

分别用摇瓶和15L发酵罐,对南极假丝酵母产胞外脂肪酶的培养基成分和操作条件进行了实验研究。得到最优的培养基组成为:豆粉40g／L,淀粉15g／L,豆油5mL／L,K2HPO4g／L,MgsO4·7H2O1g／L,Tween-800.1％,酵母膏5g／L;操作条件为:温度24℃,初始pH值为6.0,通气量为10.0L／min。在此培养条件下,发酵周期缩短至54h。由15L发酵罐生产的酶液酶活达到19.2U／mL。酶液在pH值为4.0～6.0和7.5～9.0范围内较稳定,其最适宜pH值范围为6～8.5;70℃时酶的催化活性最大.在40～70℃的温度范围内保持1h后残留酶活为60％。     

谈陶瓷材料对草坪灯的介入

陶瓷与自然有着天然的联系,能带给人们回归自然的审美情趣。陶瓷材料制作的灯具以其自然多变的机理、色调和形 状,比其他材料的灯具更易与景现环境融为一体。本文通过对草坪灯现状的分析,根据陶瓷材料的特点,提出陶瓷介入 草坪灯,对丰富室外环境审美客体有着积极的意义。     

YS-842催化剂在Hypol工艺PP中试装置上的应用

将Ziegler-Natta高效载体催化剂YS—842在Hypol工艺聚丙烯(PP)中试装置上进行应用考核，考察了该催化剂的适应性及共聚合性能。试验表明，YS—842催化剂活性高(达1．2Mg／g)、寿命长、氢调敏感性好：用YS—842催化剂生产的聚合物流动性好，粒径分布窄，细粉少，平均粒径为640μm；等规指数大于98．5％，堆密度大于0．45g／mL；试生产的F401、J340，其机械性能与使用进口催化剂生产的产品相当。     

胺烷基化聚羟基酸酰胺类超分散剂的研制及应用

对胺烷基化聚羟基酸酰胺的合成方法进行研究，确立了反应条件与制得的聚羟基酸酯特征之间的一些相互关系。并为获得适当长度的聚酯链选择了最佳合成条件。同时扼要论述了这类超分散剂的结构特性，以及对于颜料粒子表面吸附作用、分散体系的稳定作用以及对涂料、油墨生产的重要意义。     

A study on carbon coating to silicon and electrochemical characteristics of Si-C/Li cells

The aim of this paper is to study the electrochemical behavior of Si-C material synthesized by heating a mixture of silicon and polyvinylidene fluoride (PVDF) in the ratios of 5, 20, and 50 wt%. The particle size of the synthesized material was found to be increased with increase in the PVDF ratio. The coexistence of silicon with carbon was confirmed from the XRD analysis. A field emission scanning electron microscope (FESEM) study performed with the material proved the improvement in coating efficiency with increase in the PVDF ratio. Coin cells of the type 2025 were made by using the synthesized material, and the electrochemical properties were studied. An electrode was prepared by using the developed Si-C material. Si-C|Li cells were made with this electrode. A charge|discharge test was performed for 20 cycles at 0.1 C hour rate. Initial charge and discharge capacities of Si-C material derived from 20 wt% of PVDF was found to be 1,830 and 526 mAh|g, respectively. Initial charge/discharge characteristics of the electrode were analyzed. The level of reversible specific capacity was about 216mAh/g at Si-C material derived from 20 wt% of PVDF, initial intercalation efficiency (IIE), intercalation efficiency at initial charge/discharge, was 68%. Surface irreversible specific capacity was 31 mAh/g, and average specific resistance was 2.6 ohm * g.     

NDN-1型氮氧化物脱除催化剂的评价及应用

对NDN-1型氮氧化物脱除催化剂进行了实验室性能评价,并与进口催化剂A及国产催化剂B进行了比较,结果表明,NDN-1型催化剂的化学组成、结构、性能均优于进口催化剂A。介绍了该催化剂在南京帝斯曼东方化工有限公司工业应用的情况。     

新型实用旋膜蒸发器与流程

旋转薄膜蒸发器又名刮抹薄膜蒸发器或搅拌薄膜蒸发器。文内择要讨论了原有设备及流程的特点与不足，以及为解决这些不足而开发出的新型设备与流程。