渤海海峡跨海通道建设对城市经济联系的影响分析          下载免费PDF全文

狄乾斌  马洁 《海洋开发与管理》2018,35(3):102-108

渤海海峡跨海通道建设将极大改变环渤海乃至整个东部沿海的交通格局,势必对其目标城市大连、烟台带来直接的经济影响,同时也会对辽东半岛、山东半岛乃至东北、华北和华东不同尺度地区的经济联系产生深远影响。文章选取山东省17个和辽宁省14个地级市的地区的生产总值、城市人口以及城市间的最短时间距离等指标,测度渤海海峡跨海通道建成前后,对山东、辽宁两省区域城市经济联系的影响。研究表明:渤海海峡跨海通道建成后,对大连、烟台间的经济联系强度有显著提高,各城市经济联系度的平均增幅明显不同;同时,受距离衰减规律的影响,两省的城市分别以大连、烟台为中心,根据距离远近及城市自身发展程度分为4个层次,经济联系强度由内向外逐层次减弱;从整体上看,渤海通道的建设对带动两省城市之间的经济联系度都有大幅度提升。  相似文献   

强震临震微波动现象初步研究(二)   总被引：1，自引：0，他引：1  

杨立明  郝臻  王建军  张淑珍  姚家俊  董蕾 《中国地震》2018,34(2):234-243

为了验证和检验强震临震微波动现象及其主要特征,利用甘、青、川、滇、藏等区域台网200余个宽频带数字地震台站的波形资料,建立了实时监控技术系统。通过对2012~2014年间青藏块体发生的24次5级以上地震及部分无震区域台站观测的全程实时跟踪、动态监控,检验和验证了临震微波动现象的重现性和客观性,验证了临震微波动现象的频谱、时间、空间、方向性等特征,进一步得出了临震微波动现象可能与地震强度有关,且震级越大,震前出现持续临震微波动的可能性越大的结论。  相似文献   

绿潮暴发对浮游动物群落结构影响研究          下载免费PDF全文

于洋  孟娜  王建勇  王尽文  刘迎迎  王珍珍 《海洋开发与管理》2019,36(3):57-63

本调查于2016年和2017年的5月、8月,对日照近岸海域浒苔暴发区进行了4个航次的浮游动物断面调查。4个航次中,2016年和2017年5月航次获得的种类数要明显低于同年8月航次,而平均丰度和湿重生物量均高于同年8月航次。造成这种情况的原因可能是调查海域8月浒苔暴发结束,浒苔的消亡过程会大量消耗营养盐,导致水体中营养盐含量下降,进而影响到其他浮游植物和浮游动物的生长。应用PRIMER软件中的单变量分析得到群落种数(S)、丰富度(d)、香农-威纳指数(Shannon-Weaner index)(H′)和均匀度(J),从多样性指数分析可以看出,5月航次的生物多样性均劣于同年8月航次。不同年度相同季节航次中出现的优势种极其相似,而不同季节航次出现的优势种则大不相同。  相似文献   

Legitimization through patronage? Strategies for political control beyond ethno-regional claims in Darjeeling,India     

《Geoforum》2015

This paper asks how contending political leaders legitimize their authority in a competitive authoritarian regime. It contends that ‘legitimization through patronage’ is an important means of convincing the public of the rightfulness of a leader’s authority when ‘ideology-based normative legitimacy’ is declining and the formal electoral route is not available. Drawing on an understanding of legitimacy that accounts for leaders’ strategies and public receptions, the paper seeks to explore the moral norms and values on the basis of which followers evaluate leaders’ performance. Drawing on anthropological studies of patronage in South Asia not only helps to transcend an exclusively instrumental understanding of patronage by stressing its moral dimension but also complements comparative politics’ focus on the national level by studying the everyday processes through which political leaders’ legitimacy is locally constructed and contested in patronage relations. Evidence from Darjeeling in northern West Bengal/India (where the State’s preferential treatment of a regional party claiming leadership of a movement for regional autonomy has contributed to the establishment of a dominant party regime) highlights patronage’s potential as a legitimating strategy – but it also reveals its practical limits. While the establishment of resource monopolies over developmental funding helped leaders of the ruling party to “feed” their support networks and foster reputations as selfless “social workers”, differing bases for the evaluation of leaders, the growing expectations of followers, and dependence on external patronage resources limited the long-term success of patronage as a legitimating strategy. This, in turn, enabled the State to curtail demands for autonomy by controlling regional elite construction.  相似文献   

Feeding strategies of deep-sea sub-Arctic macrofauna of the Faroe-Shetland Channel: Combining natural stable isotopes and enrichment techniques     

E. Gontikaki  D.J. MayorB.E. Narayanaswamy  U. Witte 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(2):160-172

The response of a sub-arctic, deep-sea macrofaunal community to a simulated food sedimentation event was studied by means of a stable isotope “pulse-chase” experiment. A food pulse was simulated by adding 500 mg C m⁻² of ¹³C-labelled diatoms, Chaetoceros radicans, to sediment cores retrieved from 1080 m in the Faroe-Shetland Channel. Carbon uptake by specific macrofaunal groups was quantified after 3 and 6 days of incubation. The carbon uptake of the dominant taxon (Polychaeta) was quantified at the genus-, and where possible, species-level, representing a data resolution that is rare in deep-sea tracer studies. The macrofaunal community reacted rapidly to the diatom addition, with 47% and 70% of the animals illustrating ¹³C-enrichment after 3 and 6 days, respectively. Approximately 95% of C uptake was located in the upper 2 cm due to the particularly shallow vertical distribution of the macrofaunal community and the nonexistent tracer subduction by burrowing species. Polychaetes of the families Ampharetidae and Cirratulidae were among the most heavily labelled with above background enrichment reaching 1300‰. Approximately 0.8 and 2.0 mg C m⁻² were processed by the macrofauna after 3 and 6 days, representing 0.2% and 0.4% of the added carbon, respectively. It was not possible to differentiate sub-surface deposit-feeding polychaetes from predator/scavenger- and omnivorous polychaetes using their natural ??¹⁵N signatures. However, the combination of natural abundance ??¹⁵N data and ¹³C-labelling experiments proved to be useful for elucidating trophic relations in deep-sea food webs. This study confirms that macrofauna play an active role in the short-term carbon cycling at bathyal depths even at sub-zero temperatures and highlights the need for detailed knowledge of the community structure in understanding carbon processing patterns and early diagenesis of organic matter in marine sediments.  相似文献   

阜新矿震台网无线信道测试     

王学成  刘一萌  唐喆  李秀丽  雷晨 《内陆地震》2011,25(2):185-190

为了提高矿震台网的运行率,保障地震数据的连续率、完整率,对阜新矿震台网的信道进行了测试,主要包括制作传播路径地形剖面图以了解信道传输的视通条件、对信道传播损耗的理论计算及功率储备的测量、进行接收场强及背景干扰的测试以确定传输频点。结果显示,阜新矿震台网无线传输信道的场强在50~73 dB之间,能够保证无线信号传输质量,符合遥测台网建设技术规范要求。  相似文献   

Wavelet-based detection of bush encroachment in a savanna using multi-temporal aerial photographs and satellite imagery     

《International Journal of Applied Earth Observation and Geoinformation》2015

Although increased woody plant abundance has been reported in tropical savannas worldwide, techniques for detecting the direction and magnitude of change are mostly based on visual interpretation of historical aerial photography or textural analysis of multi-temporal satellite images. These techniques are prone to human error and do not permit integration of remotely sensed data from diverse sources. Here, we integrate aerial photographs with high spatial resolution satellite imagery and use a discrete wavelet transform to objectively detect the dynamics in bush encroachment at two protected Zimbabwean savanna sites. Based on the recently introduced intensity-dominant scale approach, we test the hypotheses that: (1) the encroachment of woody patches into the surrounding grassland matrix causes a shift in the dominant scale. This shift in the dominant scale can be detected using a discrete wavelet transform regardless of whether aerial photography and satellite data are used; and (2) as the woody patch size stabilises, woody cover tends to increase thereby triggering changes in intensity. The results show that at the first site where tree patches were already established (Lake Chivero Game Reserve), between 1972 and 1984 the dominant scale of woody patches initially increased from 8 m before stabilising at 16 m and 32 m between 1984 and 2012 while the intensity fluctuated during the same period. In contrast, at the second site, which was formely grass-dominated site (Kyle Game Reserve), we observed an unclear dominant scale (1972) which later becomes distinct in 1985, 1996 and 2012. Over the same period, the intensity increased. Our results imply that using our approach we can detect and quantify woody/bush patch dynamics in savanna landscapes.  相似文献   

Simulating bed evolution following the Barlin Dam (Taiwan,China) failure with implications for sediment dynamics modeling of dam removal     

《国际泥沙研究》2016,(4):299-310

The failure of the Barlin Dam in Taiwan, China offers an important case study for evaluating concepts in modeling the rapid erosion and channel recovery following intentional and unplanned dam removals. We present a modeling effort that applied a 1D and quasi-2D uncoupled hydraulics and sediment model (NETSTARS) to evaluate how discretization and parameterization influence thefitofbed elevationpredic-tions to observations following dam failure. Our analysis evaluated the model sensitivity to sediment transport function, active layer thickness, and number of stream tubes used to define the cross-section. Results indicate that a) the model is more sensitive to active layer thickness and sediment transport function than to the number of stream tubes, b) development of dam removal models are likely to benefit from varying the active layer thickness in time, and c) increased lateral discretization does not appear to improve model fit in the steep and rapidly changing river environment at our site. We conclude with discussion on differences between, identifying the need for, and general use of 1D, quasi-2D, and fully 2D models in dam removal and failure analysis.  相似文献   

‘Universal’ recession curves and their geomorphological interpretation     

《Advances in water resources》2014

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An experimental study of sediment transport in channel confluences     

《国际泥沙研究》2016,(1):87-96

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