scholarly journals Environmental evolution of gucheng lake for the past 4000 years revealed by a short core

1993 ◽  
Vol 5 (4) ◽  
pp. 316-323 ◽  
Author(s):  
Ji Lei ◽  
◽  
Wang Sumin ◽  
Zheng Changsu ◽  
Yang Xiangdong ◽  
...  
Keyword(s):  
Environmental Evolution ◽  
The Past ◽  
Gucheng Lake ◽  
Short Core

scholarly journals Environmental evolution of Lake Liangzi and its driving factors over the past 100 years, Hubei Province

2016 ◽  
Vol 28 (3) ◽  
pp. 545-553 ◽  
Author(s):  
ZHANG Qinghui ◽  
◽  
DONG Xuhui ◽  
YANG Xiangdong
Keyword(s):  
Hubei Province ◽  
Driving Factors ◽  
Environmental Evolution ◽  
The Past

scholarly journals Environmental changes during the past 400 years documented by a short core from Lake Gahai, eastern Qaidam Basin

2015 ◽  
Vol 27 (4) ◽  
pp. 735-744
Author(s):  
CHEN Dou ◽  
◽  
MA Xueyang ◽  
ZHANG Yuzhi ◽  
YANG Yaping ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Qaidam Basin ◽  
The Past ◽  
Short Core

Environmental evolution and hydrodynamic process of Dongping Lake in Shandong Province, China, over the past 150 years

2012 ◽  
Vol 68 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Yingying Chen ◽  
Shiyue Chen ◽  
Jiazhen Liu ◽  
Min Yao ◽  
Weibo Sun ◽  
...  
Keyword(s):  
Shandong Province ◽  
Hydrodynamic Process ◽  
Environmental Evolution ◽  
The Past ◽  
Dongping Lake

Environmental evolution of the Acholla coast (Gulf of Gabes, Tunisia) during the past 2000 years as inferred from palaeontological and sedimentological proxies

2020 ◽  
Vol 296 (3) ◽  
pp. 217-235
Author(s):  
Mohamed Kamoun ◽  
Chahira Zaibi ◽  
Martin R. Langer ◽  
Afef Khadraoui ◽  
Asma Ben Hamad ◽  
...  
Keyword(s):  
Sediment Cores ◽  
High Energy ◽  
Coastal Environment ◽  
Longshore Current ◽  
Environmental Evolution ◽  
Sedimentation Pattern ◽  
The Past ◽  
Sand Bars ◽  
Past 2000 Years ◽  
High Species Richness

A multi-proxy approach to infer the environmental evolution and coastal dynamics was conducted on four sediment cores with the aim to decipher forcing factors shaping the coastline of Acholla (Tunisia) over the last 2000 years. The data recorded from palaeontological and sedimentological studies combined with 14C dating suggest a progression of four successive phases: (1) the first Holocene marine transgression (183 A. D.), overlying Upper Pleistocene marine sandstones, resulted in a brackish shallow-water coastal environment characterized by a mixture of lagoonal/estuarine, marine/brackish and marine/lagoonal ostracod assemblages with high species richness, (2) a high-energy event marked by the deposition of coarse bioclastic sands, rich in molluscs, charcoal particles and Tyrrhenian lithoclasts (towards 417 A. D.), (3) progradation of the coast (between 417 and 1577 A. D.), where longshore current drifts and a period of flooding/detrital input resulted in the build- up of a sandspit and the deposition of coastal sand bars, as indicated by increasing abundances of predominantly lagoonal/estuarine ostracods and molluscs. The natural sedimentation pattern was impacted by the construction of a Roman pier that accelerated the formation of the sandspit from 1577 A. D. onward (4), ultimately resulting in the complete closure of the lagoon as recorded by the expansion of saltmarshes containing a monospecific ostracod fauna (Cyprideis torosa).

Observations of the continuum near the galactic centre

1967 ◽  
Vol 31 ◽  
pp. 405
Author(s):  
F. J. Kerr
Keyword(s):  
Galactic Centre ◽  
The Past ◽  
Centre Region ◽  
The Continuum

A continuum survey of the galactic-centre region has been carried out at Parkes at 20 cm wavelength over the areal11= 355° to 5°,b11= -3° to +3° (Kerr and Sinclair 1966, 1967). This is a larger region than has been covered in such surveys in the past. The observations were done as declination scans.

The Origin of the Moon and its Relationship to the Origin of the Solar System

1962 ◽  
Vol 14 ◽  
pp. 133-148 ◽  
Author(s):  
Harold C. Urey
Keyword(s):  
Solar System ◽  
The Moon ◽  
The Past ◽  
The Earth ◽  
Short Period ◽  
Origin Of The Moon

During the last 10 years, the writer has presented evidence indicating that the Moon was captured by the Earth and that the large collisions with its surface occurred within a surprisingly short period of time. These observations have been a continuous preoccupation during the past years and some explanation that seemed physically possible and reasonably probable has been sought.

On The Possibility of an Autonomous History of Modern Southeast Asia

1961 ◽  
Vol 2 (2) ◽  
pp. 73-105 ◽  
Author(s):  
John R. W. Small
Keyword(s):  
Southeast Asia ◽  
Contemporary History ◽  
The Past ◽  
History Of

It is generally accepted that history is an element of culture and the historian a member of society, thus, in Croce's aphorism, that the only true history is contemporary history. It follows from this that when there occur great changes in the contemporary scene, there must also be great changes in historiography, that the vision not merely of the present but also of the past must change.

Stellar Evolution

1962 ◽  
Vol 11 (02) ◽  
pp. 137-143
Author(s):  
M. Schwarzschild
Keyword(s):  
Solar System ◽  
Stellar Evolution ◽  
Space Craft ◽  
New Techniques ◽  
Substantial Body ◽  
Individual Stars ◽  
The Past ◽  
Evolution Of Galaxies ◽  
History Of ◽  
Fast Flow

It is perhaps one of the most important characteristics of the past decade in astronomy that the evolution of some major classes of astronomical objects has become accessible to detailed research. The theory of the evolution of individual stars has developed into a substantial body of quantitative investigations. The evolution of galaxies, particularly of our own, has clearly become a subject for serious research. Even the history of the solar system, this close-by intriguing puzzle, may soon make the transition from being a subject of speculation to being a subject of detailed study in view of the fast flow of new data obtained with new techniques, including space-craft.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

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