利用铝热还原金属铬炉渣制备彩色氧化锆陶瓷

为提升氧化锆陶瓷的使用性能,采用氧化钇稳定的四方氧化锆为基体（yttria stabilized tetragonal zirconia,3Y-TZP）,将铝热法生产金属铬所得炉渣（铝铬渣）按照不同比例（质量分数为5%~15%）加入,利用无压烧结在1 400 ℃保温2 h制备出彩色氧化锆陶瓷。通过X射线衍射（XRD）、扫描电镜（SEM）、显微硬度计及万能材料试验机测试了试样的物相、显微结构及力学性能。结果表明：掺杂铝铬渣可以制备出粉红色系氧化锆复合陶瓷,其物相主要为四方氧化锆、单斜氧化锆和含铬的氧化铝,并且铝铬渣的加入促使更多的四方氧化锆保留到室温。铝铬渣的加入不利于试样的烧结致密性,随着其含量增加复合陶瓷烧结后的体积收缩率降低,基体内出现部分孔隙。但是,铝铬渣的加入提升了试样的力学性能,当其加入量为5%（质量分数）时,氧化锆复合陶瓷的显微硬度和抗折强度均达到最大值,分别为1 755.3 HV和421.3 MPa。     

无烧结助剂SiC陶瓷的高压烧结研究

以纳米SiC为原料,用两面顶压机在不同工艺条件下(1100-1300℃,4.0-4.5GPa,20-35min)实现了无烧结助剂添加的SiC陶瓷体的烧结.研究了烧结工艺对SiC陶瓷性能的影响.用XRD、SEM、显微硬度测试仪等对SiC高压烧结体进行了表征.结果表明:采用超高压工艺可实现无烧结助剂SiC陶瓷高致密化烧结;烧结体晶粒长大得到抑制,维持在纳米级,晶格常数收缩发生了收缩;烧结体显微硬度和密度随烧结温度、烧结压力、保温时间的升高或延长而提高.在4.5GPa/1250℃/35min的超高压烧结条件下烧结的无烧结助剂SiC致密度达到96%,且显微硬度达到Hv1.96 3850.     

脂溶性茶多酚对共轭亚油酸的抗氧化性研究

鉴于商品茶多酚的脂溶性较差,将茶多酚合成脂溶性茶多酚以及在茶多酚中添加乳化剂的方法增强其在共轭亚油酸(CLA)中的溶解性,同时试验它们对CLA的抗氧化作用。结果表明,脂溶性茶多酚在CLA中的溶解度明显增加,对CLA的抗氧化作用好于BHT,它能抑制CLA中TBA反应物的形成,但对于CLA过氧化值的影响不如茶多酚大。添加乳化剂(span40,span60)及柠檬酸能增强茶多酚在CLA中的抗氧化效果。     

山东灵雀山金矿控矿构造特征及演化模式

灵雀山金矿虽为分布在变质岩区的石英脉型金矿床,但基于控矿构造类型、低序次构造成矿特征、控矿构造与脉岩岩浆活动关系、控矿构造最佳部位的确定等,表明灵雀山金矿床主要受NNE、NW和近EW向脆性构造控制,属中生代构造-岩浆-成矿作用的产物,与区域地壳演化相一致.     

The Regulatory Framework Across International Jurisdictions for Risks Associated with Consumption of Botanical Food Supplements

Dietary supplements, including those containing botanical ingredients and botanical‐derived compounds, have been marketed to consumers globally for many decades. However, the legislative framework for such products remains inconsistent across jurisdictions internationally. This study aims to compare the regulatory framework of botanical food supplements in the EU, USA, Canada, Australia, New Zealand, India, Japan, and China. The study also aims to investigate and describe safety assessment criteria for botanical food supplements where they are present in the above said jurisdictions, and attempts to analyze whether these criteria are suitable for addressing the toxicological risks associated with the use of botanical food supplement products, based on the evaluation of reported adverse effects related to botanical food supplement use as examples. Finally, this study discusses some future issues that need further attention, such as the consideration of less than lifetime exposures, potential for misidentification, and adulteration of botanical supplements by pharmacologically active substances. It is concluded that the regulatory approaches towards botanical food supplements differ significantly across jurisdictions. In addition, national authorities are increasingly considering having more regulatory oversight for such products. Further consideration of the actual impact of adverse events arising from botanical food supplement usage will be helpful in guiding such decisions.     

南京钟山琵琶湖景区联谊会所设计

以南京钟山琵琶湖景区联谊会所工程为例,提出了风景区建筑的设计原则;并在案例中尝试"敞"、"隐"、"聚"、"融"等设计手法,力求设计出属于"此时、此地、此景、此情"的风景区建筑.     

菊花保健果冻的研制

以菊花为主要原料,以卡拉胶、魔芋粉为主要胶体,研制了营养价值高,感官性状良好,并具有一定保健功能的果冻。采用三因素三水平试验确定了菊花的最佳浸提条件,即为:浸提温度85℃,时间为25 min,加水量为70倍。还探讨了卡拉胶、魔芋粉的最佳配比,通过正交试验得出保健果冻的最佳配方,即为:胶粉(卡拉胶∶魔芋粉为4∶1)为1.3%,白砂糖15%,柠檬酸0.18%,菊花浸提液25%。     

喜树碱类衍生物的构效关系及其活性的研究进展

喜树碱具有抗肿瘤活性,但由于它的毒副作用及水溶性差而限制了对它的使用。目前,有不少关于对喜树碱分子结构改进和修饰的报道。许多高活性的喜树碱衍生物相继问世。本文对结构修饰和构效关系做一简要综述。     

天然气分散制氢的技术经济分析(英文)

It is well established that hydrogen has the potential to make a significant contribution to the world energy production.In U.S.,majority of hydrogen production plants implement steam methane reforming(SMR) for centralized hydrogen production.However,there is a wide lack of agreement on the nascent stage of using hydrogen as fuel in vehicles industry because of the difficulty in delivery and storage.By performing technological and economic analysis,this work aims to establish the most feasible hydrogen production pathway for automotives in near future.From the evaluation,processes such as thermal cracking of ammonia and centralized hydrogen production followed by bulk delivery are eliminated while on-site steam reforming of methanol and natural gas are the most technologically feasible options.These two processes are further evaluated by comprehensive economic analysis.The results showed that the steam reforming(SR) of natural gas has a shorter payback time and a higher return on investment(ROI) and internal rate of return(IRR).Sensitivity analysis has also been constructed to evaluate the impact of variables like NG feedstock price,capital of investment and operating capacity factor on the overall production cost of hydrogen.Based on this study,natural gas is prompted to be the most economically and technologically available raw material for short-term hydrogen production before the transition to renewable energy source such as solar energy,biomass and wind power.