In what common study did their mutual reflections merge ? the increasing simplification traceable from the egyptian epigraphic hieroglyphs to the greek and roman alphabets and the anticipation of modern stenography and telegraphic code in the cuneiform inscriptions semitic and the virgular quinquecostate ogham writing celtic 从埃及碑铭的象形文字到希腊罗马字母,足以追踪出逐渐变得单纯的迹象还有楔形碑文闪米特语132和斜线号五肋骨形欧甘文字133凯尔特语,具有近代速记术与电报符号之先驱的性质。
Current studies suggest that some of these symbols were retained in the later formalized indus script , much as ancient mesopotamian and egyptian symbols on pottery and clay tablets from around 3500 b . c . e . and 3200 b . c . e . , respectively , later found their way into cuneiform and hieroglyphic writing 最新的研究显示,这些符号中有些在日后正式的印度字母表中保留了下来,和公元前约3500年刻在陶器、泥版上的美索不达米亚语符号,以及公元前约3200年刻在陶器、泥版上的埃及语符号,几乎一样古老(后面两种语言符号后来分别发展成楔形文字和象形文字) 。
For shutters , the results show : 1 ) according to the formula p = , the theoretical value of is calculated by the effective velocity of the flow , and its engineering value is calculated by the arriving velocity of the flow , the relationship between the theoretical value of and its engineering value is 2 ) the smaller value of declining angle will result in the smaller pressure loss and smaller outlet velocities . as a result , the declining angle of 30 掳 or less is recommended in some places which need small wind velocity , such as broadcasting studio and library , and the declining angle of 45 掳 or less is recommended in places which need big wind velocity , such as cinema and office ; 3 ) the larger value of ratio between the wide of the shutter b and the space between two boards h ( b / h ) will result in the larger pressure loss and smaller outlet velocities . the range of b / h from 0 . 8 to 2 . 0 and the optimum value 1 . 2 is recommended ; 4 ) the range of b from 10 mm to 50 nun and the optimum value 40 mm is recommended ; 5 ) the proper thickness of the boards 8 of the shutters is 1 . 5 mm ; 6 ) cuneiform boards should replace the rectangle inlet boards of the shutters in order to obtain better ventilation 数值模拟采用fluent软件,计算结果用excel进行处理,通过对大量数值工况进行数值模拟计算,结果表明:对于单侧百叶风口,计算表明: 1 )对于公式p = ( ~ 2 ) 2 ,的理论计算值中定义为流体流经百叶风口内部时的速度,即有效速度,而工程上常使用流体的来流速度来计算,计算表明,的理论计算值与工程应用值的关系为( _ (理论) ) ( _ (工程) ) = 0 . 813 ; 2 )当来流速度一定时,挡板倾斜角度越小,压力损失越小、出口速度越小;因此在要求进口风速比较小的场所,如播音室、图书馆等,宜采用挡板角度30的百叶风口;在要求进口风速比较大的场所,如电影院、办公室等,百叶挡板的角度应选45 ; 3 )当来流速度一定时,百叶挡板的挡板宽度b与挡板间距h的比值b h越大,压力损失越大,出口速度越小,计算表明,鉴于压力损失、出口风速、板间形成涡流区的大小,百叶挡板的b h值取0 . 8到2 . 0之间, b h = 1 . 2为最佳值; 4 )当来流速度一定时,在计算的条件下,当百叶挡板宽度b = 40mm时,百叶挡板的阻力系数最小,考虑到涡流区等的影响,建议选用10mm b 50mm的百叶挡板;西安建筑科技大学硕士学位论文5 )百叶挡板的厚度取为1 . sinln为好; 6 )百叶挡板的入口侧可选用具有倾斜度的楔形挡板来代替矩形挡板,利用其较好的导流作用,可得到更好的出流效果。
In the light of all kinds of structural faces and their assembles along tunnel , the place and growth depth of instable cuneiform body in tunnel wall rock could be predicted , then its volume and weight of instable cuneiform body are estimated based on the equator plane projecting method and the solid body ratio geometry method , which offers reliable geologic data for designing corresponding supporting measure 摘要利用赤平投影法和实体比例几何法分析隧洞围岩稳定性,根据隧洞沿线所遇结构面相互组合形式,预测隧洞围岩不稳定楔形体的位置及其发育深度,从而估算不稳定楔形岩块的体积和重量,为设计相应的支护措施提供可靠的地质依据。
Cuneiform script or is one of the earliest known systems of writing.Egyptian hieroglyphs also have a claim, and it is unsettled which system began first.