Stability of the Laminar Flow Through a Straight Pipe of Circular Cross-Section to Infinitesimal Disturbances Which are Symmetrical about the Axis of the Pipe.
Stability of the Laminar Flow Through a Straight Pipe of Circular Cross-Section to Infinitesimal Disturbances Which are Symmetrical about the Axis of the Pipe.
复制标题
通过圆形截面直管的层流对关于管轴对称的无限小扰动的稳定性。
DOI：
10.1073/pnas.34.6.285
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发表时间：
1948
影响因子：
11.1
通讯作者：
C. Pekeris
中科院分区：
文献类型：
--
作者：
C. Pekeris
与1918年的死亡率下降相比，1945年（不来梅的死亡率是1946年）以来的死亡率下降令人鼓舞，而且有望成为一种先见之明。诚然，断定最糟糕的阶段已经结束是危险的。1922-1923年死亡率的二次上升表明，表面上的复苏是多么容易受到不利影响。德国公共卫生当局本身对死亡率的明显改善并不重视，而是重视官方记录的活动性疾病报告病例的大幅增加。在提到的委员会看来，报告案件的增加并不具有某些德国当局所认为的全部意义。这在很大程度上是由于病例发现计划的大幅扩大，据信在某种程度上，也许在很大程度上，是由于向诊断为结核病的人提供食品补充剂而鼓励报告病例。委员会将详细分析现有的数据。与此同时，结核病问题虽然仍然相当严重，但似乎没有最初担心的那么严重。
The drop in mortality since 1945 (1946 in the case of Bremen), when viewed inAthe light of the drop in 1918, is encouraging, and, it is to be hoped, prophetic. It is admittedly hazardous to conclude that the worst phase is over. The secondary rise in mortality in 1922-1923 shows how susceptible an apparent recovery is to adverse influences. German public health authorities themselves lay less stress on the apparent improvement in death rate than they do on an officially recorded great increase in reported cases of active disease. In the opinion of the commission to which reference has been made this rise in reported cases does not have the full significance attributed to it by some of the German authorities. It appears in large part due to a greatly expanded case-finding program, and is believed to be in some and perhaps large degree affected by the incentive to case reporting furnished by the food supplements granted to persons diagnosed as tuberculous. The available data will be analyzed in detail by the commission. In the meantime the tuberculosis problem, while still of considerable magnitude, appears less serious than was orginally feared.