منابع مشابه
Office of Fossil Energy Oil & Natural Gas Technology
Umitaka Spur, situated on an unusual collisional plate boundary along the eastern margin of the Japan Sea, hosts gas seeps, pock-marks, collapse structures, and gas hydrates. Piston cores were recovered from this ridge to understand carbon cycling, pore fluid gradients and authigenic mineralization above a methane-charged system. We present the chemistry of fluids and solids from three cores ad...
متن کاملThe Mathematical Intelligencer flunks the Olympics
The Mathematical Intelligencer recently published a note by Y. Sergeyev that challenges both mathematics and intelligence. We examine Sergeyev's claims concerning his purported Infinity computer. We compare his grossone system with the classical Levi-Civita fields and with the hyperreal framework of A. Robin-son, and analyze the related algorithmic issues inevitably arising in any genuine compu...
متن کاملKinematic analysis of post office employees' workstations.
This study analyzed a post office clerk's tasks, comparing two workstation models. The clerk was facing the client in one, and seated at 45 degrees to the counter in the other. We analyzed the most frequent tasks and those presenting the most critical points: 1) payment of a postal order; 2) accepting a registered letter, breaking them down into subtasks. We used an optoelectronic system for ki...
متن کاملPost-war Us Unemployment Movements
We consider the contribution of sectoral shocks to post-war US unemployment movements in a dynamic factor framework. Whereas previously published estimates of the contribution of sectoral shocks to unemployment relate to a particular theory of unemployment, our approach is sufficiently general to encompass almost any theory. We estimate our model in the frequency domain and use data on unemploy...
متن کاملTrends in antihypertensive drug therapy by US office-based physicians.
US Office-Based Physicians To the Editor: We read with great interest the article by Nelson and Knapp1 on the trends of antihypertensive therapy by US office-based physicians. Their findings are clearly significant, but some of their conclusions are not supported by the data presented. The authors state that “physician antihypertensive drug prescribing was generally consistent with the basic an...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/341179c0