摘要：昔日宫廷赏鱼乐,如今百姓养鱼欢。早在古代的春秋时期就有齐惠王与庄子:"非鱼知鱼乐的壕上观鱼。"金鱼,是祖国珍贵的民族"艺术品"。

摘要：Super-long span bridges demand high design requirements and involve many difficulties when constructed,which is an important indicator to reflect the bridge technical level of a *** the past three decades,a large percentage of the new long-span bridges around the world were built in China,and thus,abundant technological innovations and experience have been accumulated during the design and *** paper aims to review and summarize the design and construction practices of the superstructure,the substructure,and the steel deck paving of the long-span bridges during the past decades as well as the current operation status of the existing long-span bridges in China.A future perspective was given on the developing trend of high-speed railway bridge,bridge over deep-sea,health monitoring and maintenance,intellectualization,standard system,and information technology,which is expected to guide the development direction for the construction of future super long-span bridges and promote China to become a strong bridge construction country.

摘要：四川气田含Ｈ２Ｓ和ＣＯ２的天然气管道内壁腐蚀环境恶劣、腐蚀情况较为严重。气田从开发生产以来已发生过数十起因管内腐蚀引起的输气管道爆破事故，造成了很大的损失，影响了气田的安全生产。采用内防腐涂层是抑制管道内壁腐蚀的有效手段。氢渗透检测技术可通过在现场监测涂层膜下腐蚀反应产生的氢渗透电流的变化情况，综合评价实际工况条件下介质的腐蚀性和管道内防腐涂层的性能。利用该技术，在四川气田川西北矿区含Ｈ２Ｓ天然气管道上对耐Ｈ２Ｓ、ＣＯ２专用内防腐涂料的防腐效果进行了分析、评价。

摘要：随着全球生活用纸行业整合的进程放缓,卫生纸机供应商面临的客户群体更加多样化。经市场验证,并购是满足不断演进的市场需求的前进方向之一。本世纪初,前10大生活用纸生产商占全球总产能近一半。2020年,随着全球总产能的强劲增长,该占比下降到40%以下。新建项目规模不等,有中小规模的,也有几乎可以称之为“巨无霸”型的。而后一类则在很大程度上归因于近年来逐步跻身世界前10行列的亚洲生产商(如图1)。

摘要：随着生活用纸生产商全球整合率不断下降,纸机供应商面临的客户群体更加多样化。并购,经市场验证,是满足不断演进的市场需求的前进方向之一。截至本世纪初,前十大生活用纸生产商占全球总产能近一半。2020年,该占比下降到40%以下,而全球总产能则强劲增长。新建项目跨度大,有中小规模的新建项目,也有几乎可以称之为“巨无霸型”的新建项目。而后一类则在很大程度上归因于近年来逐步跻身世界前十行列的亚洲生产商。如图1。