Prerapation and Supercapacitor Property of Al Doped Co_3O_4

以KOH作沉淀剂制备掺杂Al(Ⅲ)的Co3O4粉体.X射线衍射显示,掺Al的Co3O4不改变其晶型结构.循环伏安、恒流充放电等测试表明,化学掺Al后的Co3O4电极,其比容量提高,当Co(Ⅱ)与Al(Ⅲ)的摩尔比为1∶0.05时,在0~400 mV的电位区间内,5 mA/cm2电流密度下,单电极放电比容量可达518.07 F/g.With KOH as precipitator to prepare Aluminum doped Co3O4,X-ray diffraction indicated that the doping Al did not change the crystal structure of Co3O4.Electrochemical properties of the sample were tested by cyclic voltammetry and constant-current charge/discharge.The results showed that the chemical doping improved the specific capacitance.When the mol ratio of Co(Ⅱ) with Al(Ⅲ)was 1∶0.05,the specific capacitance was up to 518.07 F/g within 0～400 mV potenitial at current density 5 mA/cm2.作者联系地址：哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院,哈尔滨工程大学材料科学与化学工程学院 黑龙江哈尔滨150001,黑龙江哈尔滨150001,黑龙江哈尔滨150001,黑龙江哈尔滨150001Author's Address: College of Material science and Chemical Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,Chin

基于滤纸基质研究干燥过程中的Maillard反应

为研究干燥过程中的Maillard反应,以滤纸为基质材料制备了果糖-脯氨酸反应体系实验样品,并在不同的温度和时间条件下干燥,通过测定水相萃取液在420 nm处的吸光度（A（420 nm））研究干燥后实验样品的棕色化程度,采用气相色谱-质谱（GC/MS）法和高效液相色谱-串联质谱（HPLC-MS/MS）法分别测定挥发性成分和Heyns化合物的量。结果表明：①干燥过程中Maillard反应程度与时间和温度正相关。②通过GC/MS法在Maillard反应产物中定性出6种挥发性组分。③Heyns化合物2-脱氧-2-L-脯氨酸-D-葡萄糖（Pro-Glu）的量随着干燥温度的升高呈先增加后降低的趋势,110℃干燥9 min时检测到的Pro-Glu量最高,为202.13μg/mL

中国植物油料产业内贸易的实证研究An empirical study on intra industry trade of vegetable oilseeds in China

产业内贸易对我国油料安全具有深远影响。为推动我国植物油料贸易和产业的健康发展，从总体和分类两个层面分别计算2011—2020年中国植物油料的Grubel-Lioyd指数、Bruelhart边际产业内贸易指数以及Thom & McDowell指数，分析我国植物油料贸易现状，并提出相应建议。结果表明：近年来我国植物油料贸易增量主要来自产业间贸易，植物油料的总体产业内贸易水平偏低；Thom & McDowell指数表明近年来我国植物油料产业内贸易主要来自垂直型产业内贸易。基于此现状，针对性地提出实施差异化的植物油料产业内贸易发展战略，建立植物油料贸易可持续发展的长效机制，培育具备国际竞争力的大型农企集团，提升植物油料风险管控能力等相关政策建议。Intra industry trade has a profound impact on the safety of oilseeds in China. To promote the healthy development of China′s vegetable oilseeds trade and industry, the Grubel-Lioyd index, Bruelhart marginal intra industry trade index and Thom & McDowell index of vegetable oilseeds from 2011 to 2020 were calculated respectively from the overall and classification levels, further the current situation of vegetable oilseeds trade in China were analyzed and corresponding suggestions were proposed. The results showed that the increase of China′s vegetable oilseeds trade in recent years mainly came from intra industry trade, and the overall intra industry trade level of vegetable oilseeds was low. Thom & McDowell index showed that in recent years, China′s intra industry trade of vegetable oilseeds mainly came from vertical intra industry trade. Based on this, relevant policy suggestions were put forward, such as implementing a differentiated intra industry trade development strategy for vegetable oilseeds, establishing a long-term mechanism for the sustainable development of vegetable oilseeds trade, cultivating large-scale agricultural enterprise groups with international competitiveness, and improving vegetable oilseeds risk management and control capabilities