用一个镜头击中美国——跟于云天学摄影

风光照里摆好人气棋子 别怕被笑话,透过双手围出的方框来观察和构图是个好习惯。构图中最常采用的是三分法,找出画面中最重要的元素,放在整个画面九宫格的四个交叉点上,让突出的线条指向这个元素。一张照片应该只有一个这样的元素,别犹豫,把与它无关的东西剔出这个画面。     

中俄战略协作伙伴关系的历史

中俄睦邻友好有着悠久的历史,其间也经历了风风雨雨,而2001年两国签署的《中俄睦邻友好合作条约》为两国关系的进一步发展奠定了法律基础。中俄两国的战略协作关系体现在许多方面,如建立多层次的对话机制,继续扩大两国公众之间的相互理解,加强文化、经贸交流等。中俄战略协作伙伴关系的保持和深化给两国的社会科学工作者提出了一些非常重要的任务,如加强与传媒的合作,促使两国彼此形成一种客观、友善和相互尊重的态度和看法;在解决两国研究中存在的分歧时,要立足于两国的睦邻友好合作关系;在研究两国过去的一些局部冲突问题时,应坚持历史的立场,不能把今天的评判标准用于对过去历史事件的评价,更不能在评论事件时从今天的认识出发做道德判断等。     

中国城市早期现代化过程中的娼妓问题

在中国近代开埠城市中,娼妓炽兴,卖淫嫖娼日趋社会化、商业化、复杂化。本文从认识中国城市早期现代化过程中弊病的角度,以城乡关系和城市政治、经济、文化及市民行为观念的转型变迁为背景,剖析了这一城市病的历史及社会根源,试图揭示中国城市早期现代化过程中的几个面向和特点。     

Theoretical change and therapeutic innovation in the treatment of syphilis in mid-nineteenth-century France

This article examines changes in the treatment of venereal disease in mid-nineteenth-century France in light of theoretical developments in the understanding of these diseases. It focuses on three theories of venereal disease: the orthodox theory of the "unity" of gonorrhea and syphilis; the physiological theory of Fran?ois Broussais, which essentially denied the actual existence of such a disease; and Philippe Ricord's new doctrine of venereal disease, a theory that is often credited with having established the distinction between syphilis and gonorrhea. The argument is that theoretical considerations played a major role in the evaluation of the relative merits of these theories and that any understanding of the appeal of Ricord's new doctrine must consider not only its pathological claims but its therapeutic implications as well. This was not, however, simply an instance of theory applied. These two aspects of Ricord's new doctrine, its pathology and its therapeutics, were inextricably bound up with one another, so that judgment of the one necessarily entailed judgment of the other. The argument is that therapeutic practice should not be seen simply as a downwind consequence of changes in the theoretical understanding of disease, but rather as an integral part of the process of change. These were the kinds of developments that led doctors to believe that French medicine was making very real progress at mid-century.     

Friedrich Heinrich Lewy (1885-1950) and his work

In 1912, Friedrich Heinrich Lewy first described the inclusion bodies named after him and seen in paralysis agitans (p.a.). Tretiakoff had found (1919) that the nucleus niger is most likely to be affected but in a subsequent large-scale series of post-mortem examinations (1923). Lewy was able to confirm this for a minority of cases only, with the exception of those that displayed postencephalitic Parkinsonism (and an unknown number of atypical Parkinson syndrome cases not identified until the 1960s). In a speculative paper (1932), he saw similarities between inclusion bodies in p.a. and viral diseases like lyssa and postulated a viral genesis of p.a. In a historical review of basal ganglia diseases (1942), he did not mention the putative significance of the inclusion bodies for the post-mortem diagnosis. It seems that their importance was seen only after Lewy's death, long after Tretiakoff's initial naming of the 'corps de Lewy'. Lewy, however, had already described their diffuse and cortical distribution (1923). An identification of diffuse Lewy body disease or dementia followed much later. Lewy's career in many diverse branches of neurology and internal medicine was strongly affected by World War I and the difficult situation faced by Jews in Germany. Shortly after the Neurological Institute was founded in Berlin in 1932 (as a clinic and research institute), he was forced, in 1933, to emigrate. His exile in England and the United States mirrors the fate of many German Jews and academics in the first half of the 20th century.