Results 71 to 80 of about 966,566 (260)

Experimental study on dynamic characteristics of calcareous sand-gravel mixtures from islands in the South China Sea

Yantu gongcheng xuebao
In the construction process of reef islands in the South China Sea, the upper reclamation foundation materials exist in the form of a combination of large calcareous gravels and small calcareous sand mixed in random proportions.
WU Yang 1, WU Yihang 1, 2, MA Linjian 3, CUI Jie 1, LIU Jiankun 2, DAI Beibing 2
doaj   +1 more source

Three-Dimensional Discrete Element Analysis of Crushing Characteristics of Calcareous Sand Particles

Geofluids, 2022
Particle crushing is an important factor affecting the mechanical characteristics of calcareous sand, but at present, most of relative studying methods rely on physical experiments.
Zucheng Lu, Heying Hou, Pengming Jiang, Qing Wang, Tianxiang Li, Zhuojie Pan   +5 more
doaj   +1 more source

Climate Change and Reduction of Soil Organic Layer Thickness Increases Drought Risk in Mountain Forests of the Northern Alps

Journal of Plant Nutrition and Soil Science, EarlyView.
ABSTRACT Background On ca. 10% of the forested sites in the Bavarian Alps (Germany) mountain, forest soils (so‐called folic histosols) are characterized by thick organic layers overlying poorly weathered calcareous parent material. Aim These organic layers play a critical role in releasing water and nutrients for vegetation, yet they are also sensitive
Marc Kühnbach, Axel Wellpott, Rupert Seidl, Hans‐Joachim Klemmt, Klaas Wellhausen, Jörg Ewald   +5 more
wiley   +1 more source

Experimental study on characteristics of pore water pressure and dissipated energy of saturated calcareous sand under complex loading conditions

Yantu gongcheng xuebao, 2023
Calcareous sand, the special soil, is the main material for the filling of islands and reefs in the South China Sea, which is biogenic sediments and skeletal remains of marine organisms. It is of great importance to study its dynamic characteristics.
LI Baojian 1, 3, WANG Zhe 2, LÜ Guoer 1, PAN Kun 2, YANG Zhongxuan 3, GONG Xiaonan 3
doaj   +1 more source

Stable isotope analysis of freshwater gastropod carbonates from Swanscombe: Insights into climate stability and seasonality during MIS 11c

Journal of Quaternary Science, EarlyView.
ABSTRACT Stable isotope analyses of freshwater mollusc carbonate can record environmental conditions at the time of mineralisation, yet this technique remains underused in British Middle Pleistocene fluvial sequences, despite the abundance of fossil shell material in these deposits.
Jennifer E. Sherriff, Ian Candy, Adrian P. Palmer, Danielle C. Schreve, Tom S. White   +4 more
wiley   +1 more source

Shear breakage characteristics of calcareous sand particles under different normal pressures

Shuili Shuiyun Gongcheng Xuebao, 2018
The particles of the calcareous sands are easily broken under the conditions of high stresses. Consequently, the mechanical properties of the calcareous sands will change under the action of different pressures.
QI Yongzheng, YUAN Zirui, YANG Yongheng
doaj   +1 more source

Ngarrawa (mound spring) sediments as archives of Holocene environmental change in arid central Australia: Insights from Itrax XRF scanning

Journal of Quaternary Science, EarlyView.
ABSTRACT Central Australia's ngarrawa, or ‘mound springs’, are unique hydrological systems that serve as some of the only near‐permanent sources of water and continuous sediment deposition in Australia's arid interior. As such, they hold significant potential as palaeo‐climate and ‐environmental archives in a region where many aspects of past climate ...
Fletcher C. Nixon, Jonathan J. Tyler, Patricia S. Gadd, Quan Hua   +3 more
wiley   +1 more source

Response of the Bucket Foundation in Calcareous Sand under Horizontal Dynamic Load

, 2010
Abstract: Experiments to determine the horizontal static bearing capacity are carried out first. The static bearing capacity is a reference for choosing the amplitudes of dynamic load. Then a series of experiments under dynamic horizontal load are
鲁晓兵, 王丽, 时忠民
core   +1 more source

Climate‐modulated accumulation and erosion of sediments in the Rodderberg crater basin for the last 439 ka (East Eifel Volcanic Field, Germany)

Journal of Quaternary Science, EarlyView.
ABSTRACT Glacial/interglacial climate cycles since marine isotope stage (MIS) 12 influenced the discontinuous and 73 m‐long sediment record from the volcanic crater of Rodderberg in the East Eifel Volcanic Field, Germany. High‐resolution grain size and geochemical data have been valued by numerical dating techniques (radiocarbon and luminescence dating,
Bernd Zolitschka, Ines Hogrefe, An‐Sheng Lee, Maarit Kalliokoski, Manfred Frechen   +4 more
wiley   +1 more source

Effect of bio‐fertilization and edapho‐climatic conditions on chickpea nodulation, grain yields, and seed protein in a Mediterranean context: a meta‐analysis approach

Journal of the Science of Food and Agriculture, EarlyView.
Abstract Chickpeas (Cicer arietinum L.) serve as a protein‐rich staple, particularly in Mediterranean countries, where they are often grown in marginal and water‐stressed areas. This meta‐analysis synthesized evidence from peer‐reviewed publications across Mediterranean countries to assess how chickpea rhizobial inoculation influences chickpea ...
Amira Hachana, Amir Souissi, Lewis Ziska, Katherine Morgan, Carina Yiu, Issam Achour, Asma Bouatrous, Imen Hemissi, Hanen Arfaoui, Anissa Riahi, Manel Bouraoui, Bouaziz Sifi   +11 more
wiley   +1 more source