排序方式: 共有241条查询结果,搜索用时 296 毫秒
81.
Rick Rylance FRSA 《Journal of the history of the neurosciences》2013,22(1):100-101
Walter Moxon, MD, FRCP lived, practiced medicine, taught and wrote in the mid- to late- nineteenth-century Victorian England, mostly at Guy's Hospital, London. He was widely informed in the “Art of Physic,” writing on a range of issues from cerebral lateralization of articulate speech to angina pectoris. The present paper will trace briefly his contributions to the newly discovered asymmetry of articulate speech in the left frontal lobe (1866) and will in more detail trace and analyze his 1881 Croonian Lectures at the Royal College of Physicians on a medical shibboleth referred to as “congestion of the brain.” In a series of ingenious and rhetorically creative arguments with imaginative tropes, demonstrations, evolutionary accounts of cognition and blood metabolism for human/biped cognition, and cogent citations from the medical literature of the day, Moxon skillfully instructs his medical audience against the misleading notion of cerebral “congestion” as an underlying pathology for cognitive, motor, and sensory deficits seen in the clinic. In so doing, he provides the medical community with an in-depth glimpse at the circulatory system, its flow dynamics, and how they serve to meet the cognitive, motor, and sensory demands of upright bipedal man. 相似文献
82.
Jieh-Jiuh Wang 《Conservation and Management of Archaeological Sites》2013,15(4):449-463
Catastrophic disasters may cause irreversible damage to cultural heritage. This study identified the risk to cultural heritage sites in Taiwan posed by large-scale debris flow disasters. The cultural heritage sites that may be affected by debris flows were identified through risk identification and by using GIS. Subsequently, an on-site field survey was conducted to confirm the cultural heritage sites that are potentially vulnerable to debris flow disasters. The research findings are as follows: (a) the top three cultural heritage sites that are most affected by debris flows are municipal, county, and city monuments, historical buildings, and historical sites; (b) the number of cultural heritage sites affected is related to environmental exploitation; (c) the cultural heritage sites at high risk of being affected by disasters were primarily located in Taitung and Chiayi Counties. 相似文献
83.
采用第五次人口普查、2005年人口抽样调查和第六次人口普查数据,基于社会网络分析的视角,研究了省级尺度下中国人口迁移态势与空间格局演变特征。结果显示:(1)1995-2010年间,中国人口迁移规模迅速增大,省际间人口迁移规模差异明显;上海、浙江人口迁入率显著上升,河南、安徽人口迁出率显著上升。(2)北京、上海、安徽、四川等13省是我国人口迁移网络的核心节点,人口迁移网络表现出中心性、收敛性和地区非均衡性特点。(3)京津地区、长三角地区、广东是我国主要人口辐合流场,安徽、四川、河南、湖南等中部省份是我国主要人口辐散流场。研究表明,不同地区的人口迁移有显著的空间异质性,各地应根据自身人口迁移趋势及在全国人口迁移网络中角色,科学制定区域人口政策与经济社会发展规划。 相似文献
84.
85.
The Urach 3 research borehole in south‐west (SW) Germany has been drilled through the sedimentary cover, and the gneisses of the Variscian crystalline basement at 1600 m below the surface (Black Forest basement) has been reached. An additional 2800 m has been drilled through the fractured crystalline rocks, and the borehole has been used for a number of hydraulic tests in the context of a ‘hot‐dry rock’ (HDR) project exploring for geothermal energy. The fracture system of the basement is saturated with a NaCl brine with about 70 g L?1 dissolved solids. Water table measurements in the borehole cover a period of 13 years of observation, during which the water table continuously dropped and did not reach a steady‐state level. This unique set of data shows that the hydraulic potential decreases with depth, causing a continuous flow of fluid to the deeper parts of the upper continental crust. The potential decrease and the associated downward migration of fluid is an evidence for the progress of water (H2O)‐consuming reactions in the crystalline rocks. Computed stability relations among relevant phases at the pressure temperature (PT) conditions in the fracture system and documented fossil fracture coatings in granites and gneisses suggest that the prime candidate for the H2O‐consuming reaction is the zeolitization of feldspar. The potential of the gneisses to chemically bind H2O matches the estimated amount of migrating H2O. 相似文献
86.
P. MÖLLER H. WOITH P. DULSKI V. LÜDERS J. ERZINGER H. KÄMPF A. PEKDEGER B. HANSEN M. LODEMANN D. BANKS 《Geofluids》2005,5(1):28-41
The pilot hole (VB) of the German Continental Deep Drilling Program (KTB) was drilled to a depth of 4000 m, where large amounts of free fluids were met. The KTB‐VB 4000 m fluid can be related to either Mesozoic seawater or formation water from Permo‐Carboniferous sedimentary rocks of the Weiden embayment. During the Upper Cretaceous uplift of the Bohemian Massif both fluids could have passed organic‐rich Triassic to Carboniferous formations of the Weiden embayment before invading the uplifted and fractured basement rocks of Devonian amphibolites and metagabbros, where the chemical composition of the fluids was changed by albitization, adularization, and chloritization. Results of chemical mass balances for both sources are presented. In order to concentrate the formation water from the Weiden embayment significant amphibolitization has to be assumed. During a 1‐year pumping test the chemical composition of the 4000 m fluids remained constant. The accuracy of chemical analyses is critically reviewed. An improved preconcentration method of rare earth elements and yttrium in high‐Ca‐bearing saline fluids is described. 相似文献
87.
88.
地铁与城市商业地域的结构存在极大关系。实地调查获取广州15个地铁站点商圈零售商业营业面积、地铁网络等数据,利用栅格分析方法计算不同地铁站点的可达性程度的差异性。运用回归模型分析不同地铁站点可达性、客流与站点商圈零售商业空间结构的相关关系。以广州天河市级商业中心为例,微观上分析地铁站点客流对商业中心空间结构的影响。结果表明:地铁站点交通可达性、客流量与站点零售商业营业面积存在较强关联性,但换乘站点的可达优势与客流优势在商业上未能完全体现;地铁客流与较高等级的商业存在较大的相关性,而与低等级的商业相关性小,甚至负相关;客流的增加促进了地铁附近的商业形态从传统零售业向更高级业种演化。 相似文献
89.
90.
翠华山水湫池及其附近崩塌堆积形成年代探疑 总被引:2,自引:0,他引:2
通过对相关史料的分析,论证了翠华山主景区崩塌堆积不可能是唐天宝年间地震诱发山崩形成的。通过实地考察,认为这些崩塌堆积不是同时发生,而是多期崩塌活动的结果,并且崩塌活动又都发生在水湫池被堰塞成湖之后。因此,水湫池不可能是唐代的地震山崩形成的。 相似文献