河床下多层采空区叠加区域帷幕注浆充填技术

由于位于河床下的多层地表露头防水煤柱受地方煤矿盗采破坏,造成露头煤岩柱小于防水煤柱临界值。在总结历年帷幕注浆的基础上,研究应用河床下多层采空区叠加区域的注浆充填防塌技术和工艺。通过注浆充填技术对多层盗采采空区进行充填,在老空区内形成一道帷幕挡水墙,同时加固老空区上覆岩层,有效防止河床上覆岩层的变形垮塌,防止河水溃入井下。

宋代流配地域的演变及其影响——以刺配法的实施为中心

宋代刺配刑泛滥,导致触法流配者大为增加。为避免因配隶人群大量聚集而导致的社会治安乱局,宋廷一方面施行诸路间相互移配、散配的政策,另一方面格于军政形势及祖制,将配隶地域逐步由京畿地区向南方远路转移。步入南宋,由于疆域的蹙缩及政治地理格局的剧变,流配地域在进一步南移中逐渐集中于五岭地域的远恶州军,而大量的逃亡配军刑徒与盐寇、峒寇相纠合,加剧了该区域及近邻州军的动乱,成为终宋之世都未能解决的地方军政难题。

Liquid-holdup regions research of novel reactive distillation column for C5 fraction separation

Recent advances in technologies of reactive distillation(RD) offer various design concepts for chemical processes.For separation of cracking C5 fraction, one of the main challenges is improving the conversion of cyclopentadiene(CPD) and the recovery of isoprene(IP). In the current work, a novel reactive distillation column with several liquid-holdup regions was designed, since it allows long residence time and provides flexibility for narrowing the efficiency gap between reaction and distillation. By use of Aspen Plus, a corresponding mathematic model was established and verified to be accurate. Following that, comprehensive studies were carried out for the design of liquid-holdup regions position. Details and principles about the separation performance with the liquid-holdup regions were revealed and optimized parameters were determined with 100 theoretical plates,feed position of 35 th plate, and four liquid-holdup regions at 25 th, 60 th, 75 th and 90 th plate. The designed RD column could well meet the technical requirement, and influence of other important factors including residence time, operating pressure and reflux ratio was further investigated.

首都战略下的北宋黄河河道变迁及其与京东社会之关系

在黄河流路上舍北保南,在流民流向上舍东保西,这是政治中心东移后北宋隐晦的首都战略。这一新的首都战略对京东社会带来了影响深远的负面后果,即常态化的河北流民。京东接受河北流民是对河患改嫁河北的变相补偿,京东"盗区"也以毗邻河北的曹州、濮州、济州、郓州、齐州一带为中心向四周延伸。金朝定都北京,河北、山东的河患与流民问题不复存在,京东特殊的"盗区"形象亦不复存在。