Is distance really dying? Transportation and knowledge spillovers

Enhanced transportation infrastructure improves the frequency of travel and facilitates face-to-face communication. Will the resulting reduction in travel cost mitigate the geographical concentration of knowledge spillovers? Our empirical strategy exploits China's mass expansion of its intercity high-speed railway network as a natural experiment. Using patent citations as the proxy for knowledge spillovers, we find inventors increasingly rely on more distant knowledge after rail connection and newly connect cities' innovation performance improves substantially.     

中国民族考古学的形成与考古学的本土化

中国民族考古学的形成是由自身独特背景和学术环境所决定的,在辩证唯物史观指导下,运用民族志材料解释,复原考古学材料。从民族考古发展到民族考古学形成了中国民族考古学的强烈特色。     

The development and evolution of “cerebral thermometry”: The physiology underlying a nineteenth-century approach to cerebral localization and neurological diagnosis

ABSTRACT

Surface thermometers were developed in the latter half of the nineteenth century. From the 1850s through the 1880s, collaborations between physicians, research scientists, and instrument makers produced clear improvements in the technology to measure cranial surface temperatures, with development of self-registering mercury surface thermometers resistant to pressure and little influenced by ambient temperature, apparatus for recording cranial surface temperatures from multiple stations simultaneously, and development of thermoelectric apparatus. Physiologic studies of cranial surface thermometry were conducted over a quarter century from 1861 to 1886. Beginning in the 1860s Albers in Bonn, Germany, and Lombard at Harvard and later in England systematically investigated surface temperatures on the head using surface thermometers and thermoelectric apparatus; they demonstrated that head temperatures were variable over time and across individuals and were not clearly influenced by thinking or muscular contraction but were influenced by ambient air temperature. In 1880 Amidon in the United States claimed that cranial surface thermometry during exertion produced localized increases in surface temperature on the contralateral scalp in a specific pattern (“external motive areas”) indicating underlying brain areas responsible for each movement. Amidon’s results were not reproduced by experienced physiologists in England or France. Contemporaries recognized that significant technical and practical problems limited the accuracy and reliability of cranial surface thermometry. Physiological studies of cranial surface thermometry ended in the mid 1880s, although some clinicians who were early advocates promoted its use in clinical contexts into the early twentieth century.     

Eighth annual meeting of the international society for the history of the neurosciences hosting the Ninth meeting of the european club for the history of neurology JULY 7–10, 2003

Damasio (1994) claims that Descartes imagined thinking as an activity separate from the body, and that the effort to understand the mind in general biological terms was retarded as a consequence of Descartes dualism. These claims do not hold; they are Damasios error. Descartes never considered what we today call thinking or cognition without taking the body into account. His new dualism required an embodied understanding of cognition. The article gives an historical overview of the development of Descartes radically new psychology from his account of algebraic reasoning in the early Regulae (1628) to his neurobiology of rationality in the late Passions of the soul (1649). The author argues that Descartes dualism opens the way for mechanistic and mathematical explanations of all kinds of physiological and psychological phenomena, including the kind of phenomena Damasio discusses in Descartes error. The models of understanding Damasio puts forward can be seen as advanced version of models which Descartes introduced in the 1640s. A far better title for his book would have been Descartes vision.     

新时期的思想解放与马克思主义中国化的历史发展

新时期以来的思想解放与马克思主义中国化有着清晰的脉络和明确的成果。在新时期中共历史发展的三个阶段、四个重大关头,思想解放形成了三次“大潮”和若干个“次大潮”。随着思想解放的不断深入,马克思主义中国化在实践和理论两个方面取得了丰硕的成果,即在实践中探索出一条建设中国特色社会主义的道路;理论上形成了邓小平理论和“三个代表”重要思想两大成果。