研究了单宁、硅胶和Polyclar R Brewbrite等澄清剂对黄酒混浊蛋白特异性去除的效果,并通过采用N-三(羟甲基)甘氨酸-十二烷基磺酸钠-聚丙烯酰胺凝胶电泳、基质辅助激光解析电离飞行时间串联质谱,研究了黄酒混浊蛋白及不同澄清剂吸附蛋白...研究了单宁、硅胶和Polyclar R Brewbrite等澄清剂对黄酒混浊蛋白特异性去除的效果,并通过采用N-三(羟甲基)甘氨酸-十二烷基磺酸钠-聚丙烯酰胺凝胶电泳、基质辅助激光解析电离飞行时间串联质谱,研究了黄酒混浊蛋白及不同澄清剂吸附蛋白的分子量、蛋白质种类及来源,并比较了澄清剂处理前后酒样隆丁区分和非生物稳定性的变化。结果表明:黄酒混浊蛋白的主要成分为类燕麦蛋白和二聚α-淀粉酶抑制剂,主要来源于小麦,几种澄清剂对二聚α-淀粉酶抑制剂都有一定的吸附作用,且处理后的酒样稳定性得到提高,其中以单宁效果最为明显。展开更多
The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of sp...The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.展开更多
利用全国756基准站1994—2013年MICAPS地面常规观测资料和47个城市2002—2012年国家环境保护总局公布的空气污染指数（the Air Pollution Index,API）数据,对北京、南京、重庆沙坪坝、广州4个大城市霾日和API的气象条件进行分析。结果...利用全国756基准站1994—2013年MICAPS地面常规观测资料和47个城市2002—2012年国家环境保护总局公布的空气污染指数（the Air Pollution Index,API）数据,对北京、南京、重庆沙坪坝、广州4个大城市霾日和API的气象条件进行分析。结果表明：1）我国霾日和API的高值区主要分布在中东部地区,年霾日自1998年开始上升,并持续增长,到2013年达到最多。1月霾日最多,8月霾日最少。2002—2012年期间,与年霾日不同,年API呈下降趋势,12月API最高,8月API最低。四大城市的霾日和API的年际变化和月际变化均存在较大差异。2）一般情况下,霾发生时,北京、南京、重庆沙坪坝、广州对应的相对湿度较高;霾发生时,北京西南风占主导作用,南京和广州均东南风占主导作用,重庆沙坪坝西北风占主导作用,风速多集中在1~4 m/s,负变压及低层大气稳定时更易产生霾日。3）低层稳定度（γ850）对四大城市的API的影响各不相同,北京和重庆沙坪坝与γ850呈负相关,即越稳定,API值越高,南京和广州与γ850呈正相关,即越不稳定,API值越高。4）多元线性回归方程的结果表明：热力因子（相对湿度、γ850）和动力因子（地面风速、24 h变压）对四大城市冬季霾日能见度和冬季API各有贡献。展开更多
Because the large areas of Iran are on arid and semiarid belt of the world, it has many problems due to windstorms. Wind storms cause dust and haze due to a mass of fine sand or silt soil elevated in the atmosphere. I...Because the large areas of Iran are on arid and semiarid belt of the world, it has many problems due to windstorms. Wind storms cause dust and haze due to a mass of fine sand or silt soil elevated in the atmosphere. It makes heart disease-cardiovascular and respiratory and so is detrimental for the children. These have plagued the residents and so lives of them are disrupted every so often. In this research, the subject soil stabilization using adherence of poly vinyl acetate polymer as a way to reduce the production of dust is defined for prone area. In this paper, the effect of poly vinyl acetate polymer on silt soil has been studied. In this study the samples were uncompacted particles of soil with different amount of water-solvated polymer (0, 5, 10, 15, 20, 25, 30 grams per meter squared) poured over them. These samples are kept in experimental environment for 7 days. After ensuring complete dryness, their stabilities are tested against wind flow with 20 m/s speed. Results showed that adding more polymers to soil would considerably increase its particles’ stabilities. This stability is due to positive reaction of polymer with soil particles. The effect of this stability is maintained during sample drying time in the lab and the soil maintains its characteristics during testing. The best results are obtained for 20 grams polymer per meter squared, where caused an increase in stability to about 15 times that of the soil without polymer.展开更多
文摘研究了单宁、硅胶和Polyclar R Brewbrite等澄清剂对黄酒混浊蛋白特异性去除的效果,并通过采用N-三(羟甲基)甘氨酸-十二烷基磺酸钠-聚丙烯酰胺凝胶电泳、基质辅助激光解析电离飞行时间串联质谱,研究了黄酒混浊蛋白及不同澄清剂吸附蛋白的分子量、蛋白质种类及来源,并比较了澄清剂处理前后酒样隆丁区分和非生物稳定性的变化。结果表明:黄酒混浊蛋白的主要成分为类燕麦蛋白和二聚α-淀粉酶抑制剂,主要来源于小麦,几种澄清剂对二聚α-淀粉酶抑制剂都有一定的吸附作用,且处理后的酒样稳定性得到提高,其中以单宁效果最为明显。
基金supported by the National Natural Science Foundation of China (12171291,11601291,61873154)the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (20200001)+5 种基金the Fundamental Research Program of Shanxi Province (20210302124018)the Shanxi Scholarship Council of China (HGKY2019004)the Scientific and Technological Innovation Programs (STIP)of Higher Education Institutions in Shanxi (2019L0082)the Program for the Outstanding Innovative Teams (OIT)of Higher Learning Institutions of Shanxithe Simons Foundation-Mathematics and Physical Sciences (523360)the 1331 Engineering Project of Shanxi Province.
文摘The energy-intensive industrial economy results in frequent Fog-Haze weather which increases the risk of influenza spread and brings new challenges for the prevention and control of influenza.Therefore,the study of spread mechanics and controlling strategies of influenza based on Fog-Haze will be scientifically meaningful.Considering that when the concentration of Fog-Haze is low,Fog-Haze contributes to the number of infectious individuals and Fog-Haze suppresses the transmission of the influenza virus when the concentration of Fog-Haze is high,we establish the Fog-Haze dynamics model.Then we prove the global existence and boundedness of the solution,and the global asymptotic stability of the solution is given by constructing a suitable Lyapunov functional.Under the Fog-Haze weather,we study the inffuenza virus transmission model that incorporates the incidence rate to reflect the Fog-Haze-dependent saturation effect and investigate the effect of Fog-Haze pollution on the transmission of influenza.We show that the basic reproduction number R_(0) determines the global dynamics of the system:if R_(0)<1,the disease-free equilibrium is global asymptotically stable;the unique endemic equilibrium is global asymptotically stable if R_(0)>1.Simulations are carried out to validate the theoretical results.Our study provides further understanding of the dynamics of Fog-Haze and the effect of Fog-Haze pollution on the transmission of influenza.
文摘Because the large areas of Iran are on arid and semiarid belt of the world, it has many problems due to windstorms. Wind storms cause dust and haze due to a mass of fine sand or silt soil elevated in the atmosphere. It makes heart disease-cardiovascular and respiratory and so is detrimental for the children. These have plagued the residents and so lives of them are disrupted every so often. In this research, the subject soil stabilization using adherence of poly vinyl acetate polymer as a way to reduce the production of dust is defined for prone area. In this paper, the effect of poly vinyl acetate polymer on silt soil has been studied. In this study the samples were uncompacted particles of soil with different amount of water-solvated polymer (0, 5, 10, 15, 20, 25, 30 grams per meter squared) poured over them. These samples are kept in experimental environment for 7 days. After ensuring complete dryness, their stabilities are tested against wind flow with 20 m/s speed. Results showed that adding more polymers to soil would considerably increase its particles’ stabilities. This stability is due to positive reaction of polymer with soil particles. The effect of this stability is maintained during sample drying time in the lab and the soil maintains its characteristics during testing. The best results are obtained for 20 grams polymer per meter squared, where caused an increase in stability to about 15 times that of the soil without polymer.
