废塑料再生行业在快速发展的过程中暴露出越来越多的问题,其中最主要的是废旧塑料再生过程中产生的大气污染问题。该文通过对2家废旧塑料再生企业工艺废气及厂区环境空气进行监测,发现工艺废气中以颗粒物和VOCs为主要污染物,且均能检测...废塑料再生行业在快速发展的过程中暴露出越来越多的问题,其中最主要的是废旧塑料再生过程中产生的大气污染问题。该文通过对2家废旧塑料再生企业工艺废气及厂区环境空气进行监测,发现工艺废气中以颗粒物和VOCs为主要污染物,且均能检测出汞和铅2类重金属,同时检出二噁英毒性当量质量浓度范围为0.0316~0.252 ng TEQ/m^(3);厂区环境空气检出了多环芳烃PAHs、邻苯二甲酸酯PAEs和低分子量芳香族化合物等,其中部分种类PAHs和PAEs总浓度变化范围超过清远市大气总浓度。对于废旧塑料再生企业,建议有针对性地选择废气治理设施,同时完善行业总量控制指标体系。展开更多
In this paper,we introduce the Minkowski measure of asymmetry for the spherical bodies of constant width.Then we prove that the spherical balls are the most symmetric bodies among all spherical bodies of constant widt...In this paper,we introduce the Minkowski measure of asymmetry for the spherical bodies of constant width.Then we prove that the spherical balls are the most symmetric bodies among all spherical bodies of constant width,and the completion of the spherical regular simplexes are the most asymmetric bodies.展开更多
In this paper, we show that when Minkowski measure of asymmetry of convex body K of constant width is bigger than a（n-1）, K has at least n＋1 critical chords, where a（n）=n＋（2n（n＋1））√1/2/n＋2.
In this paper,the p-Minkowski type measures of asymmetry for convex bodies,which have the well-known Minkowski measure of asymmetry as the special case p=∞,are introduced,and some properties of the p-Minkowski type m...In this paper,the p-Minkowski type measures of asymmetry for convex bodies,which have the well-known Minkowski measure of asymmetry as the special case p=∞,are introduced,and some properties of the p-Minkowski type measures are investigated.展开更多
In this paper, we study the Minkowski measure of asymmetry for n-dimensional convex bodies of revolution （ n ≥ 3 ）. We show that among all n-dimensional convex bodies of revolution, the bodies which generated by is...In this paper, we study the Minkowski measure of asymmetry for n-dimensional convex bodies of revolution （ n ≥ 3 ）. We show that among all n-dimensional convex bodies of revolution, the bodies which generated by isosceles triangles are the most asymmetric ones. Also, we study the asymmetry for n-dimensional constant width bodies of revolution.展开更多
文摘废塑料再生行业在快速发展的过程中暴露出越来越多的问题,其中最主要的是废旧塑料再生过程中产生的大气污染问题。该文通过对2家废旧塑料再生企业工艺废气及厂区环境空气进行监测,发现工艺废气中以颗粒物和VOCs为主要污染物,且均能检测出汞和铅2类重金属,同时检出二噁英毒性当量质量浓度范围为0.0316~0.252 ng TEQ/m^(3);厂区环境空气检出了多环芳烃PAHs、邻苯二甲酸酯PAEs和低分子量芳香族化合物等,其中部分种类PAHs和PAEs总浓度变化范围超过清远市大气总浓度。对于废旧塑料再生企业,建议有针对性地选择废气治理设施,同时完善行业总量控制指标体系。
基金Supported by the National Natural Science Foundation of China(12071334,12071277)。
文摘In this paper,we introduce the Minkowski measure of asymmetry for the spherical bodies of constant width.Then we prove that the spherical balls are the most symmetric bodies among all spherical bodies of constant width,and the completion of the spherical regular simplexes are the most asymmetric bodies.
基金Supported by the Innovative Project of College Students of Jiangsu Province(201710332019Z)the Natural Science Foundation of Jiangsu Province(BK20171218)the National Natural Science Foundation of China(11671293)
文摘In this paper, we show that when Minkowski measure of asymmetry of convex body K of constant width is bigger than a（n-1）, K has at least n＋1 critical chords, where a（n）=n＋（2n（n＋1））√1/2/n＋2.
基金Supported by Postgraduate Research and Practice Innovation Program of Jiangsu Province(KYCX20_2745)the National Natural Science Foundation of China(12071334 and 12071277)
文摘In this paper,the p-Minkowski type measures of asymmetry for convex bodies,which have the well-known Minkowski measure of asymmetry as the special case p=∞,are introduced,and some properties of the p-Minkowski type measures are investigated.
基金Supported by the National Natural Science Foundation of China(11271244,11271282)
文摘In this paper, we study the Minkowski measure of asymmetry for n-dimensional convex bodies of revolution （ n ≥ 3 ）. We show that among all n-dimensional convex bodies of revolution, the bodies which generated by isosceles triangles are the most asymmetric ones. Also, we study the asymmetry for n-dimensional constant width bodies of revolution.
