Street petrol station shops as an alternative to missing local food suppliers – Contribution to the German discourse on ‘Daseinsvorsorge’: A German view     

《Applied geography (Sevenoaks, England)》2015

Services of general interest fulfill people's daily needs and are important for their well-being. In Germany, interacting socioeconomic and demographic processes currently lead to a spatial concentration of such services. Rural areas are particularly affected, resulting in a deterioration of living conditions. Nevertheless, although in the media and in policy these processes are intensely discussed against the background of the German political and scientific discourse on ‘Daseinsvorsorge’, little is known about their dimensions. However, such knowledge is important for both policy and scientific policy advice, as ‘Daseinsvorsorge’ is a key concept in German spatial planning discourse, rooted in the normative political goal of guaranteeing comparable living conditions throughout Germany. This goal includes the aim of ensuring a sufficient offering of services indispensable for life throughout the country. One subject area where a spatial concentration can be observed is retail food sales. As a consequence, especially in rural areas, the network of food shopping locations becomes more wide meshed. Against this background, the German petrol-sector claims that in rural regions, petrol station shops (PSS) might replace a missing local food retailer. Based on the data from an accessibility analysis of petrol stations, supermarkets and discounters, together with considerations on the assortment of PSS, the article analyses the potential of such shops to fulfill this function in rural Germany through the lens of ‘Daseinsvorsorge’. The analysis reveals the following: (1) PSS still mainly serve impulse shopping needs, offering only a very limited assortment of staple foods; (2) in the majority of regions with no supermarket or discounter accessible by foot, PSS are also not accessible by foot; and (3) by car, the picture is very similar. Considering these points, it can be concluded that in Germany, PSS cannot at this time fully replace a missing local retail trade, especially in rural areas.  相似文献   

Erratum: Dust yields in clumpy supernova shells: SN 1987A revisited     

《Monthly notices of the Royal Astronomical Society》2007,379(3):1248-1248

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ANALYSIS OF EVOLUFIONARY RELATIONSHIP BETWEEN ASTASIA LONGA AND EUGLENA GRACILIS BY USING RAPD TECHNIQUE AND CLADISTIC ANALYSIS     

王江新施之新  甘小妮谢树莲 《中国海洋湖沼学报》2001,19(1):40-50

Although both Astasia longa and Euglena gracdlis belong to different genera, they share many morphological characters except that A. longa has no chloroplast. In the 1940‘ s, on the basis of the finding that in darkness or upon addition of scrne chemicals, E. gmcilis would fade reversibly or irreversibly, scrne scholars hypothesised that A. longa evolved from E. gracilis by losing chloroplast.The authors‘ use of RAPD and cladistic analyses in a study on the evolutionary relationship between A .longa and E. gmcilis showed that the A. longa ‘ s relationship with E. gmcilis was closer than that with other green euglenoids. This proves the hypothesis that A. longa evolved from E. gmcills is reasonable. The results d this study suggest that saprophytic colorless euglenoids were transformed fromgreen euglenoids by losing their choroplasts.  相似文献   

无法方程组平差     

梅雪良 《地球科学与环境学报》1990,(3)

本文旨在提供一种适合计算机编制程序的平差算法,其中心思想是通过对平差数学模型中A系数阵进行初等变换,直接求得用虚拟独立参数表示的平差数学模型,然后根据虚拟独立参数与原平差模型参数的数学联系,求得原平差模型参数及有关精度。  相似文献   

Temperature evolution of the envelope of SN 1987A     

Lin Xuan-bin  You Jun-han  Cheng Fu-zhen  Fu Cheng-qi 《Chinese Astronomy and Astrophysics》1995,19(4)

We present a theoretical derivation of the H_α line luminosity of the expanding envelope of SN 1987A from the theory of hydrogen recombination lines. A remarkable deviation of our calculated H_α light curve from the observed light curve was found when a constant temperature was assumed. From the deviation we easily derive the temperature evolution. The temperature actually rises after day 500 and this may be explained as follows: as the shell expands, the electron and ion densities rapidly fall, greatly reducing the recombination cooling rate, while heating continues.  相似文献   

Globular clusters as probes of galaxy evolution: NGC 5128     

S. K. Yi  E. Peng  H. Ford  S. Kaviraj  S.-J. Yoon 《Monthly notices of the Royal Astronomical Society》2004,349(4):1493-1499

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关于港口经济和港城一体化的理论分析   总被引：4，自引：0，他引：4  

徐质斌  朱毓政 《广东海洋大学学报》2004,24(5):7-13

运用经济资源配置中的成本—收益分析、区域经济生长的极核理论等 ,对港口的经济性、港城经济一体化发生的内在机理和模型、建设重点等进行理论分析  相似文献   

UBV photometry of the Ap variable UZ Psc = HD 10783     

Robert H Hardie  Edwin J. Reichmann  Edward W. Burke  Douglas S. Hall 《Journal of Astrophysics and Astronomy》1990,11(3):277-280

NewUBV photometry, obtained between late 1965 and early 1969, is presented and combined with existing published photometry to derive an improved ephemeris for times of maximum brightness: 2439758.00+4 _d ^. .1328n. On leave from Dyer Observatory, Vanderbilt University, Nashville, Tennessee, U.S.A.  相似文献   

应用句法识别实现地球物理磁异常的自动划分     

王妙月 《地球物理学进展》1998,13(2):103-117

法球物理磁数据中蕴含着丰富的数值信息和结构信息。综合运用数值信息中的统计特征和结构信息,并结合地质和实际情况是磁异常解释的一条重要途径。本文在前人工作的基础上＾〔１〕,尝试应用句法模式识别和聚类分析的方法,根据磁异常的结构和统计特征对磁异常进行图形化、机器自动化地划分,为高精度、快速和可靠的磁测解释提供一种手段。本文首先用句法模式识别方法对磁异常进行结构划分,找出基节点,提取基元,然后用“衍生树”  相似文献   

’92、’96国家高精度GPS A级网整体平差结果分析与我国块体运动模型研究   总被引：7，自引：0，他引：7  

刘经南  施闯  陈俊勇 《武汉大学学报(信息科学版)》1998,(4)

对’９２、’９６国家高精度ＧＰＳＡ级网进行了不同方案的整体平差,研究了利用全国范围的高精度ＧＰＳ网进行我国地壳形变监测的数据处理和分析方法。利用具有可比性９２Ⅲ和９６Ⅱ平差方案建立了在ＩＴＲＦ９３框架下的我国块体运动模型,并与ＮＮＲ－ＮＵＶＥＬ１Ａ模型进行了比较;同时研究了我国的板内块体运动模型,这一结果与地质结果较为一致。  相似文献