RIA: The Role of Lubricant Viscosity in the Frictional Behavior of the Magnetic Slider/Disk

该项目将继续对史前考古和古人类遗址的ESR测年进行研究。由于天然放射性的轰击，能量储存在天然材料中。储存的能量随着时间的推移而增加，可以用来确定材料的年龄。存储能量的量可以根据这些材料显示的电子自旋共振(ESR)信号的强度来确定。ESR测年可以应用于大型哺乳动物的牙釉质和火中加热的石英。牙釉质在考古和原始人遗址中非常常见，通过ESR可以测定出从几千年到三百多万年的时间，精度为+5%到10%。烧焦的火石和石英在考古遗址中也很常见。ESR测年已成功应用于欧洲、非洲和亚洲的史前遗址，并为现代人的出现提供了革命性的新观点。该项目将继续研究ESR分析方法，并将这些方法应用于美国考古学家和人类学家正在研究的遗址。位于加拿大汉密尔顿的麦克马斯特大学的实验室是北美唯一进行这种分析的实验室，这种分析在世界范围内因其对人类进化年代学的重要性而得到世界范围的认可。

This project will continue research on ESR dating of prehistoric archeological and hominid sites. Energy is stored in natural materials as a result of bombardment by natural radioactivity. The amount of stored energy increases with time and can be used to determine the age of the material. The amount of stored energy can be determined from the intensity of an electron spin resonance (ESR) signal displayed by these materials. ESR dating can be applied to tooth enamel of large mammals, and to quartz which has been heated in fires. Tooth enamel is very commonly found in archaeological and hominid sites, and can be dated by ESR over a time range from a few thousand to over three million years with a precision of + 5 to 10%. Burnt flint and quartz are also common in archaeological sites. ESR dating has been successfully applied to prehistoric sites in Europe, Africa and Asia, and has contributed to a revolutionary new view of the emergence of Modern Man. This project will continue research on methods of ESR analysis and application of the methods to sites now being studied by U.S. archaeologists and anthropologists. The laboratory at McMaster University, Hamilton, Canada, is the only lab in North America carrying out such analyses, which have been recognized world-wide for their importance to the chronology of human evolution.