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31.
随着中国住房改革的推进,城市居民通过居住迁移进行住房调整的行为日趋频繁。居住迁移作为城市空间分异和重构的微观机制在城市地理学、住房研究中得到了广泛关注,然而现有研究主要考察居住迁移的发生概率和驱动因素,较少论及居住迁移中的区位选择。论文基于2018年“上海市居民住房和生活空间调查”问卷,采用生命历程和时间地理学视角,刻画居民居住迁移的时空轨迹,并使用多项逻辑斯蒂回归模型探究居住迁移前后居住区位变化的影响因素。研究发现,上海市居民居住迁移的主要区位选择为跨环线向外迁移,但不同世代、不同户口、不同住房产权的居民的居住区位选择有较大差异。生命历程中的年龄、可达性中的工作单位区位以及住房属性中的产权性质都是影响居住迁移区位选择的重要因素。 相似文献
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本文提出一种将地质、地震、地球化学分析相结合的方法,以研究海区天然气水合物的成藏条件,首先用物源、构造、沉积和地温等资料进行地质分析,确定海区天然气水合物成藏的地质条件;然后根据对水合物的地震属性(BSR,AVO,BZ等)分析和正演模拟研究,预测水合物及其游离气的存在,结合地质条件,圈定出水合物成藏的有利区带;最后结合对水合物主要成分(甲烷及烃类等)的地球化学异常分析,对研究区天然气水合物成藏的远景作出评价.野外实践结果表明,这种综合研究方法是有效可行的,为海区天然气水合物勘探提供了一种新的研究途径. 相似文献
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An abrupt ice and snow storm disaster which occurred in the spring of 2008 severely destroyed forests over a surprisingly large portion of southern China. A transect crossing Jinggang Mountain-Jitai Basin-Yushan Mountain-Wuyi Mountain was selected as the study area. The authors integrated field data collected in two field surveys to analyze the impacts of the disturbance on forests. The following results were obtained. (1) The extent of damage to plantations along the transect decreased in the order of slash pine > masson pine > mixed plantation > Chinese fir. Slash pine is an introduced species from southern America which is characterized by fast growth, low wood quality and rich oleoresin, and showed a damage rate of 61.3% of samples, of which 70.4% cannot recover naturally. Masson pine is the native pioneer species of forests with harder wood, and 52.5% were damaged due to turpentine, of which 60.9% cannot recovery naturally. Chinese fir is a local tree species and samples showed a rate of 46% and a relative rate of 32.5%, lower than the mixed plantation. (2) From west to east along the transect, we can see that evergreen broad-leaved forest of the western transect on Jinggang Mountain showed the lightest damage extent, and a Cryptomeria plantation at an altitude of 700 m was severely destroyed while Chinese fir showed light damage below 700 m and relatively severe damage above 900 m. Masson pine and slash pine in the central transect in Jitai Basin were damaged severely due to turpentine activities, and closed natural secondary deciduous broad-leaved forest was damaged severely due to high ice and snow accumulation on intertwined shrubs. Masson pine aerial-seeding plantations below 400 m along the eastern transect in Xingguo and Ningdu counties were nearly undamaged for small tree sizes, and Chinese fir at 500-900 m altitude showed a lighter damage extent. However, masson pine which was distributed above 400 m and planted in the 1960s, was severely damaged due to turpentine. 相似文献
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An abrupt ice and snow storm disaster which occurred in the spring of 2008 se-verely destroyed forests over a surprisingly large portion of southern China.A transect crossing Jinggang Mountain-Jitai Basin-Yushan Mountain-Wuyi Mountain was selected as the study area.The authors integrated field data collected in two field surveys to analyze the impacts of the disturbance on forests.The following results were obtained.(1) The extent of damage to plantations along the transect decreased in the order of slash pine > masson pine > mixed plantation > Chinese fir.Slash pine is an introduced species from southern America which is characterized by fast growth,low wood quality and rich oleoresin,and showed a damage rate of 61.3% of samples,of which 70.4% cannot recover naturally.Masson pine is the native pioneer species of forests with harder wood,and 52.5% were damaged due to turpentine,of which 60.9% cannot recovery naturally.Chinese fir is a local tree species and samples showed a rate of 46% and a relative rate of 32.5%,lower than the mixed plantation.(2) From west to east along the transect,we can see that evergreen broad-leaved forest of the western transect on Jinggang Mountain showed the lightest damage extent,and a Cryp-tomeria plantation at an altitude of 700 m was severely destroyed while Chinese fir showed light damage below 700 m and relatively severe damage above 900 m.Masson pine and slash pine in the central transect in Jitai Basin were damaged severely due to turpentine ac-tivities,and closed natural secondary deciduous broad-leaved forest was damaged severely due to high ice and snow accumulation on intertwined shrubs.Masson pine aerial-seeding plantations below 400 m along the eastern transect in Xingguo and Ningdu counties were nearly undamaged for small tree sizes,and Chinese fir at 500-900 m altitude showed a lighter damage extent.However,masson pine which was distributed above 400 m and planted in the 1960s,was severely damaged due to turpentine. 相似文献
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大平沟地区位于北东向阿尔金走滑断裂北侧与东西向阿尔金北缘断裂所夹持的区域。区内出露卓阿布拉克组火山-沉积岩系,其中以灰黑色粉砂质泥岩为代表的沉积岩系出露宽度3~5km,是相邻20km的东侧喀腊大湾地区出露厚度(约1km)的3~5倍。通过野外详细的地质调查,特别是运用小褶皱分析方法、褶皱层理与轴面劈(片)理关系判别分析方法,首次对阿尔金山东段大平沟地区的卓阿布拉克组火山-沉积岩系中的沉积岩夹层沿剖面开展追索研究,恢复了大平沟地区褶皱构造的轮廓,并对其成因进行初步探讨。认为南侧喀腊达坂-阿克达坂断裂以南的元古宇碳酸盐岩系较强硬的岩层、北侧阿尔金北缘断裂以北的太古宇结晶基底的刚性岩块、以灰黑色粉砂质泥岩为代表的细碎屑岩的柔性特点、冰沟岩体隆升造成其东侧盖层向东收缩是基础,而北北东向区域挤压构造应力场作用下北东东向卓阿布拉克断裂的左行走滑造成的卓阿布拉克组沉积岩系西端的侧向挤压是褶皱形成的直接原因。 相似文献
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Previously, we had characterized several structurally interesting brominated phenols from the marine red alga Symphyocladia latiuscula collected from various sites. However, Phytochemical investigations on this species collected from the Weihai coastline of Shandong Province remains blank. Therefore, we characterized the chemical constituents of individuals of this species collected from the region. Eight bromophenols were isolated and identified. Using detailed spectroscopic techniques and comparisons with published data, these compounds were identified as 2,3-dibromo-4,5-dihydroxybenzyl methyl ether (1), 3,5-dibromo-4-hydroxybenzoic acid (2), 2,3,6-tribromo-4,5-dihydroxymethylbenzene (3), 2,3,6-tribromo-4,5-dihydroxybenzaldehyde (4), 2,3,6-tribromo-4,5-dihydroxybenzyl methyl ether (5), bis(2,3,6-tribromo-4,5-dihydroxyphenyl)methane (6), 1,2-bis(2,3,6-tribromo-4,5-dihydroxyphenyl)-ethane (7), and 1-(2,3,6-tribromo-4,5-dihydroxybenzyl)-pyrrolidin-2-one (8). Among these compounds, 1 and 2 were isolated for the first time from S. latiuscula. Each compound was evaluated on the ability to inhibit protein tyrosine phosphatase 1B (PTP1B), which is a potential therapeutic target in the treatment of type 2 diabetes. Bromophenols 5, 6, and 7 showed strong activities with IC50 values of 3.9, 4.3, and 3.5 μmol/L, respectively. This study provides further evidence that bromophenols are predominant among the chemical constituents of Symphyocladia, and that some of these compounds may be candidates for the development of anti-diabetes drugs. 相似文献