According to the survey made by China Paper Association(CPA),in 2017,there were about 2,800 paper&board manufacturers in China's Mainland.The total production and consumption of paper&board were 111.30 mil...According to the survey made by China Paper Association(CPA),in 2017,there were about 2,800 paper&board manufacturers in China's Mainland.The total production and consumption of paper&board were 111.30 million tons and 108.97 million tons,increased by 2.53%and 4.59%compared with the previous year respectively;paper&board per capita consumption was 78 kg.From 2008 to 2017,the average annual growth rate of paper&board production was 3.77%,and the average annual growth rate of paper&board consumption was 3.59%.As shown in Fig.1 and Table 1.展开更多
醇类、水、氨等流体在工业上有着广泛的应用,但由于氢键作用形成分子缔合,使用简单状态方程难以精确描述其热力学性质;而在近临界区,由于浓度涨落的长程关联,使其描述则更为困难。该文在CPA(cubic plus association)状态方程的基础上,...醇类、水、氨等流体在工业上有着广泛的应用,但由于氢键作用形成分子缔合,使用简单状态方程难以精确描述其热力学性质;而在近临界区,由于浓度涨落的长程关联,使其描述则更为困难。该文在CPA(cubic plus association)状态方程的基础上,用重整化群理论修正Helmholtz自由能来考虑涨落的影响,计算了甲醇、水和氨在近临界和远离临界点区域的p-ρ-T性质。结果表明:该方法显著改善了临界参数和近临界区的气液相平衡数据的描述情况,在单相区的预测精度也较高,适用于缔合流体热力学性质的研究。展开更多
文摘According to the survey made by China Paper Association(CPA),in 2017,there were about 2,800 paper&board manufacturers in China's Mainland.The total production and consumption of paper&board were 111.30 million tons and 108.97 million tons,increased by 2.53%and 4.59%compared with the previous year respectively;paper&board per capita consumption was 78 kg.From 2008 to 2017,the average annual growth rate of paper&board production was 3.77%,and the average annual growth rate of paper&board consumption was 3.59%.As shown in Fig.1 and Table 1.
文摘醇类、水、氨等流体在工业上有着广泛的应用,但由于氢键作用形成分子缔合,使用简单状态方程难以精确描述其热力学性质;而在近临界区,由于浓度涨落的长程关联,使其描述则更为困难。该文在CPA(cubic plus association)状态方程的基础上,用重整化群理论修正Helmholtz自由能来考虑涨落的影响,计算了甲醇、水和氨在近临界和远离临界点区域的p-ρ-T性质。结果表明:该方法显著改善了临界参数和近临界区的气液相平衡数据的描述情况,在单相区的预测精度也较高,适用于缔合流体热力学性质的研究。
