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1.
Doklady Earth Sciences - The level of public health in the regions of Russia in the years 2002–2012 is characterized based on the indices of life expectancy of men and women, as well as... 相似文献
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Gilles Arnaud-Fassetta 《Geodinamica Acta》2013,26(1):79-92
Abstract In the Rhône Delta, numerous paleoenvironmental indicators coming from geomorphology, sedimentology, paleoecology and archeology provide evidences of remarkable hydrological regime change at the beginning of the Roman Antiquity. A significant reinforcement in the Rhône River's competence is indicated by the increase in grain size of the sediments deposited in the floodplain, within the immediate proximity of the channel. Increase in the fluvial sediment yield is indicated by the increase in rate of sedimentation in the floodplain. Increase in water levels is indicated by the deposition of hydromorphous facies, the development of hydrophytic species, and the decrease in activity of terrestrial lombricoids in the floodplain. Numerous crevasse splays were formed by short-term avulsions of the Rhône River between the first century BC and the AD first century. Their frequency is related to an increase of Rhône River paleodischarge, which makes the channel network incapable of evacuating large volumes of water brought in by the river. The littoral zone experienced a phase of progradation between the AD 1st and the 3rd centuries, in relation to the increase of terrigenous deposits coming from the Rhône of Ulmet. The increase in solid discharge, in the flood-dominated regime (FDR) context, can be related to the overall increase in detrital output from the catchment. The Rhône Delta rather appears in phase with the northern Alps and Massif Central from the 1st century BC to the AD 1st century. The FDR at the beginning of the Christian era contrasts with the drought-dominated regime (DDR) and the reduction of torrential rainfall in the Mediterranean and south Alpine areas. These observations allow to confirm the hydroclimatic limit which could distinguish the southern part of the catchment (Provence, Durancian Alps) from the rest of the Rhône basin. © 2002 Éditions scientifiques et médicales Elsevier SAS. All rights reserved. 相似文献
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Hanebuth Till J. J. Kudrass Hermann R. Zander Anja M. Akhter Humayun Syed Neumann-Denzau Gertrud Zahid Anwar 《Natural Hazards》2022,111(1):163-190
Natural Hazards - This study reconstructs the coastal subsidence over the past 1300 years in a mangrove region along the coast of the Ganges–Brahmaputra Delta, an area not affected... 相似文献
5.
Yanhong WU Sumin WANG 《中国地球化学学报》2006,25(B08):18-19
A 63-cm sediment core documents that the concentrations of nutrients in sediment, such as organic carbon, nitrogen and phosphorous, continually increased during the last century in Longgan Lake, middle reaches of the Yangtze River, China. C/N ratio and δ^13Corg revealed that organic matter in the sediment derived mainly from aquatic and terrestrial sources is a minor contributor. Excess phosphorous is related to human activities marked by utilization of phosphoric fertilizers since 1952 A.D. The increase of δ^13Corg towards the sediment surface, together with increasing of OC and N accumulation, indicated the elevation of lake primary productivity due to excess phosphorous loading caused by utilization of phosphoric fertilizer. The decrease of δ^15N during the primary productivity elevation process, especially after 1952, can be attributed to the discharged of nitrogen with lower δ^15N into the lake. 相似文献
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Naoual Gamrani Khalid R’kha Chaham Mouncif Ibnoussina Fabio Fratini Luisa Rovero Ugo Tonietti Mohammed Mansori Lehcen Daoudi Claude Favotto Nasrrddine Youbi 《Environmental Earth Sciences》2012,66(1):129-140
This work focuses on the building material used in the Saadian sugar refinery of Chichaoua (about 70 km southwest of Marrakesh).
The study involved a classification of different types of rammed earth, followed by their mineralogical characterization based
on optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). These studies are complemented by chemical
investigations, X-ray fluorescence, and thermal analysis (DTA and TGA). The results demonstrate the use of two types of earth
for the realisation of rammed earth, the first one non-plastic, -grained with added lime, the other one of low plasticity,
and fine grained without addition of lime. Mechanical tests on site and in laboratory how at the first type of material exhibits
great strength, exceeding the values known for rammed earth. 相似文献
7.
《Geoforum》2015
The article discusses changing ideas around citizenship through an analysis of first person accounts of women cyclists in Rational Dress in late nineteenth century Britain. A close reading of personal correspondence provides a sense of how it felt to cycle while dressed in new mobility costumes, such as bloomers, in urban and suburban English landscapes. Such attired and independently mobile women affirmed or unsettled onlooker’s understandings of how middle and upper class women should look and act in public. Some viewers subjected them to verbal and often physical assault. Others, in awe of their socio-technical sophistication were more supportive. Taking a ’bloomer point of view’ provides a unique socio-material way of gaining a deeper understanding of what enabled and also inhibited women’s claims to citizenship and freedom of movement, especially at a time when women were not citizens in a legal sense. I argue that through these richly described accounts we gain insightful glimpses into how individual sensory, embodied and political experiences collectively illuminate the becoming of ’citizen’ as it relates to mobility, gender and landscape. 相似文献
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Geologie en Mijnbouw - 相似文献
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The Taipinghu Bridge is an important project, and the safety of rock masses of its foundation is very crucial. This article analyzes the potential causes of the deformation of the rock masses of the bridge foundation, and uses the Fast Lagrangian Analysis of Continua to analyze the geologic model. The simulating process shows that no mater in the excavating process or in the loading process the rock masses are suit for the engineering. The modeling and analyzing process can be used for reference. 相似文献
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The catastrophic Shikotan earthquake of October 4 (5), 1994, occurred in the Pacific Ocean. Its focus was located 80 km eastward of Shikotan Island. The stress state of the Earth’s crust in this area was estimated by the method of the cataclastic analysis of the whole range of the earthquake mechanisms. The performed reconstruction of the parameters of the current stress state of the Earth’s crust and the upper mantle in the area of the Southern Kuril Islands made it possible to establish that this area is characterized, on the one hand, by the presence of extensive areas of steady behavior of the stress tensor parameters and, on the other hand, by the presence of local sections of anomalously fast changes in these parameters. 相似文献
11.
陶正章 《中国地球化学学报》1991,10(3):288-293,T003
The carat is the unit of weight for diamonds and other gemstones.It corresponds to the average weight of the seeds of a leguminous tree.What kind of tree is this?We have studied the samples from Ethiopia,Egypt,Cyprus and the United States.The tree is neither“Kuara“nor“Locust“（Robina pseudoacacia Linn.）,but rather Carob(Ceratonia Siliqua).In Ethiopia,as called by local inhabitants,“Kuara“is a species of Erythrina-E.brucei rather than E.abyssinica.As might be expected,using the seeds as a means of weighing an extremely valuable commodity is not very scientific.Before 1907,at various times and in various countries,there were at least twenty-three stan-dards for the carat ranging from 187.00mg to 215.990mg.The metric carat equal to 200mg was proposed in Paris in 1907.It was adopted in the United States on July1,1913 and now is the world-accepted standard.But in reality,the standard of the carat is still confused with respect to its usage throughout the world .This is why the author reiterates that the standard of the car-at should be integrated with the metric system. 相似文献
12.
The Taipinghu Bridge is an important project，and the safety of rock masses of its foundation is very crucial．This article analyzes the potential causes of the deformation of the rock masses of the bridge foundation，and uses the Fast Lagrangian Analysis of Continua to analyze the
geologic model． The simulating process shows that no mater in the excavating process or in the loading process the rock masses are suit for the engineering．The modeling and analyzing process can be used for reference． 相似文献
13.
With increasing high-quality geological and geophysical data it becomes clear that seismicity of the continents is characterized by linear patterns which are closely associated with tectonic features. The aim of this paper is to give reasonable interpretation for the earthquake distribution in the contiguous continent of the United States. Seismic lines and earthquake concentrated zones are defined, which reflect the characteristics of the continental seismotectonics. Similarities and differences in seismotectonics between the continental part of China and the contiguous continent of US are analysed. It is demonstrated that the spatial distribution of earthquakes can provide the information of the active structures in the earth's crust. The authors consider that the patterns of continental seismotectonics are not only controlled by the pre—existing tectonic frameworks and the current boundary dynamic conditions, but also possibly affected by dynamic factors of global tectonics at a higher level. 相似文献
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INTRODUCTIONIn comparison with studies on the geochemistryof the REE and trace elements of the Emeishan Per-mian basalts ,there has been onlyli mited research onthe platinum group elements ( PGE) . Preli minarystudies have been carried out on the PGE geochemis-try of the basalts in the Emeishan area ( QingyingPower Station profile) and Xinjie area (Zhang andLi ,1998) ,andinthe Shuicheng and Weining areasinGuizhou (Li et al .,2003) . There are no PGEanaly-sis data of the basaltsin… 相似文献
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Guan Shaozeng 《《地质学报》英文版》1989,63(3):281-296
Since the coexistence of the Cretaceous and Palaeocene was ascertained in the Hengyang Basin of Hunan in the middle of the 1960's, the Cretaceous and Tertiary boundary has been discussed in several papers, but it still remains controversal. The points at issue are the connotation, stratigraphical position and lateral correlation of the Dongtang (or Chejiang) Formation. 相似文献
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Doklady Earth Sciences - An attempt to provide a new explanation for the change in the geodynamic regime in the Early Cretaceous is presented below. It accounts for data on a number of global... 相似文献
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V. A. Zubakov 《Stratigraphy and Geological Correlation》2011,19(1):108-124
An international scientific conflict has arisen around the International Stratigraphic Scale, the main document that regulates
the rules of reading of geological records and, hence, concerns all Earth sciences. The matter of debate is the geological
time scale of 2004, developed by the International Commission on Stratigraphy, where the Quaternary system was abandoned. This ICS decision triggered a protest among Quaternary geologists, members of
INQUA, and became the subject of much controversy. This article provides a comprehensive analysis of the Quaternary problem
and proposes a reasonable scientific solution that may be appropriate for both parties. 相似文献
19.
Koroteev V. A. Chervyakovskiy V. S. Zaitseva M. V. Volchek E. N. Necheukhin V. M. 《Doklady Earth Sciences》2019,487(1):756-760
Doklady Earth Sciences - This paper reports on the first U–Pb dating of zircons from dacites of the volcanic paleo-edifice of the andesite–dacite complex of the Eastern Zone of the... 相似文献
20.
A simple mechanical model explaining the long-period (about 100-year) variations in the Earth’s rotational velocity is proposed. This model takes into account the gravitational interaction of the mantle with the solid core of the Earth and the fact that the core rotation leads that of the mantle. Well-known Earth parameters provide estimates of the gravitational torque that support the proposed model. The mathematical problem involved reduces to the classical problem of a nonlinear oscillator exposed to a constant torque. The well-known parameters of the core-mantle system result in a stable equilibrium and a stable limiting cycle on the phase cylinder of this oscillator. This equilibrium corresponds to a single angular velocity for the mantle and solid core, with no long-period oscillations in the length of the day. The limiting cycle corresponds to the core rotation leading the mantle rotation. In this case, the ellipsoidality of the gravitationally interacting bodies provides a periodic interchange of kinetic angular momentum between the mantle and solid core that results in long-period variations in the length of the day. The proposed model does not support the formerly widespread opinion that the core rotates more slowly than the mantle. 相似文献