脱细胞真皮基质微结构的碱法调控及其细胞相容性

作为组织工程支架材料,脱细胞真皮基质（ADM）孔径小、孔隙率不高、孔隙连通情况不理想,不符合细胞生长对支架材料微结构的理想要求。针对这一问题,选用猪皮为原料,以优化微结构为目的,综合碱处理、酶处理、去污剂处理和盐处理手段制备了一种ADM。扫描电子显微镜分析了碱处理中碱液浓度对ADM微结构的调控作用,MTT法检测了小鼠胚胎成纤维细胞（3T3）在ADM上的生长增殖,共聚焦激光扫描电镜观察了细胞的分布。结果显示：ADM不含细胞,维持了胶原纤维的天然结构,具有连通的三维孔道,孔径约100 μm;随着碱液浓度的增加,孔径与孔隙率增大,孔隙的连通性改善,骨架的形貌由膜状向纤维状转变;细胞在ADM上增殖良好、分布均匀。调节碱处理中碱液浓度可调控ADM微结构,获得微结构和细胞相容性良好的ADM。     

Reactive dividing-wall column for the co-production of ethyl acetate and n-butyl acetate

Reactive dividing-wall column (RDWC) technology plays a critical role in the energy saving and high efficiency of chemical process. In this article, the process of co-producing ethyl acetate (EA) and n-butyl acetate (BA) with RDWC was studied. BA was not only the product, but also acted as entrainer to remove the water generated by the two esterification reactions. Experiments and simulations of the co-production process were carried out. It was found that the experimental results were in good agreement with the simulation results. Two kinds of RDWC structures (RDWC-FC and RDWC-RS) were proposed, and the co-production process operating parameters of the two types of RDWC were optimized by Aspen Plus respectively. The optimal operating parameters of the RDWC-FC were determined as follows: 0.6 of the reflux ratio of aqueous phase (RR), 0.66 of the vapor split (R_V) and 0.51 of the liquid split (R_L). And the optimal operating parameters of the RDWC-RS were shown as follows: RR was 0.295 and R_V was 0.61. Furthermore, the energy saving analysis of the co-production process was based on the annual output of 10000 tons of EA, compared with the traditional reaction distillation (RD) to prepare EA and BA, the reboiler duty of the RDWC-FC column could save 20.4%, TAC saving 23.6%; RDWC-RS reboiler energy consumption could save 17.0%, TAC 22.2%.     

燃料特性对生物质直燃电站运行影响的研究

以生物质直燃发电项目为研究对象,通过对引进北欧技术设计投产的电厂的运行情况进行分析,发现燃料特性(尤其是发热量、水分和灰分数据的准确性)是造成电厂给料系统缺陷、除尘器磨损和机组不能正常运行的主要原因.给出了生物质燃料特性的经验数据,为后续生物质直燃电厂的建设和运行提供了参考.     

黄色秸秆直燃电站给料系统的优化研究

以黄色秸秆生物质直燃发电项目为研究对象,通过对北欧和国内部分已投运的黄色秸秆直燃电站大捆给料系统进行分析,指出由于国内外在生物质收集预处理方式上存在的差异,大捆给料系统方式在国内应用时存在大型打捆机械缺乏、打捆成型成本太高以及系统对捆型尺寸变化适应性差的缺陷和局限性.为了使给料系统更适应国情,提出了黄色秸秆任意捆型给料系统和小捆整捆给料和燃烧的两种优化设计方案,为后续生物质直燃电厂的建设和运行提供了参考.     

水位图像识别的场景问题处理方法和技术

水位图像识别系统基于人工智能图像识别技术,通过对水尺进行智能识别,直接获得水位的数值,但在实际应用中,由于受场景因素的干扰,稳定性大受影响。通过采用深度学习算法、多帧识别、曝光参数优化,以及摄像机硬件及光学的定制等多种手段相结合,解决各种场景因素的干扰,并在杭州之江水文站进行比测。比测结果表明,智能图像识别水尺系统满足水位观测标准中自记式水位计的要求,与传统水位测量相比,具有建设成本低、测量方式高效的优势,具有广阔的应用前景。     

甲状腺功能显像中^99mTc摄取率的临床价值

测定了１０１例甲状腺病患３、２４ｈ＾１３１Ｉ摄取率和３０ｍｉｎ ＾９９ｍＴｃ摄取率，还测定了２２例甲状腺正常３０ｍｉｎ ＾９９ｍＴｃ摄取率。结果是甲状腺正常的３０ｍｉｎ摄＾９９ｍＴｃ率为３．７３±１．５６；摄＾９９ｍＴｃ率在正常值以上的患，其摄＾９９ｍＴｃ率与摄＾１３１Ｉ率的临床符合率为８２．４％，在正常值以下的患，其摄＾９９ｍＴｃ率与摄＾１３１Ｉ率的临床符合率为９１．３％，在正常值范围的     

Polymorphism of D-mannitol: Crystal structure and the crystal growth mechanism

The polymorphism of D-Mannitol(mannitol) is reviewed in this paper. It was found that the structure of the stable form is consistent in most literatures, but different authors have given different information about the two metastable forms. Therefore the commonly used nomenclature of mannitol was summarized based on the crystal unit cell parameters with the help of X-ray powder diffraction. Moreover, the crystal growth mechanism of mannitol polymorphs was summarized. Considering the lack of kinetic data for the metastable form especially, a reported method was attempted to apply to δ mannitol in an aqueous cooling crystallization process based on the induction time previously measured, and it was identified that the growth of the δ form follows the two-dimensional(2D) nucleationmediated mechanism. The results also indicate that the method based on induction time and supersaturation should have the potential to be expanded to the metastable polymorphs for the growth property study in a bulk system.     

城市内涝风险区划集成模型及其敏感性研究

城市内涝风险区划图对内涝风险预警与防灾减灾具有重要意义.以海口市海甸岛为例,基于PCSWMM软件构建城市管网-地表径流耦合模拟的一二维水文水动力模型,采用情景模拟计算最大水深、淹没时间和最大流速等洪涝特征指标,耦合高程、坡度、坡向、距河网距离、排水管道长度、建筑物面积构建风险指标体系.分别采用TOPSIS和模糊C聚类统...     

浙江省建德市安仁石煤电厂周围环境放射性水平调查

介绍了安仁石煤发电厂周围环境放射性水平调查的方法与结果。结果表明：电厂周围环境γ辐射射剂量率水平,环境土壤和下游农田土壤中＾２３８Ｕ、＾２２６Ｒａ含量,环境大气中＾２３８Ｕ、＾２２６Ｒａ、＾４０Ｋ、＾２２２Ｒｎ浓度及α潜能值,排出水中天然铀和钍的浓度等均比对照点有升高;居住在碳化砖房内的居民,其年附儿剂量当量为２．７ｍＳｖ。