scholarly journals Annually Laminated Lake Sediments—Recent Progress

Quaternary ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 5 ◽  
Author(s):  
Wojciech Tylmann ◽  
Bernd Zolitschka
Keyword(s):  
Lake Sediments ◽  
Recent Progress ◽  
Sediment Traps ◽  
Sediment Flux ◽  
Research Directions ◽  
Environmental Signals ◽  
Sediment Research ◽  
Varved Sediment ◽  
Spatiotemporal Analyses ◽  
Annually Laminated Lake Sediments

The collection of papers entitled “Annually Laminated Lake Sediments” illustrates the recent progress made in varved sediment research and highlights the variety of methodological approaches and research directions used. The contributions cover the monitoring of modern sediment fluxes using sediment traps, geochronological and sedimentological analyses of varves, multi-proxy investigations, including geochemical and biological proxies, as well as spatiotemporal analyses based on multi-core studies supported by satellite images. The scientific issues discussed the influences of hydroclimatological phenomena on short-term changes in sediment flux, the relationships between biogeochemical processes in the water column and the formation of varves, the preservation of environmental signals in varves, and possibilities of synchronizing varved records with other high-resolution environmental archives.

scholarly journals Aeolian mass flux characterization: uncertainties from a wind-tunnel perspective and implications for field studies

2014 ◽  
Author(s):  
Ate Poortinga ◽  
Joep GS Keijsers ◽  
Jerry Maroulis ◽  
Saskia M. Visser
Keyword(s):  
Wind Tunnel ◽  
Mass Flux ◽  
Shear Velocity ◽  
Field Studies ◽  
Sediment Traps ◽  
Sediment Flux ◽  
Cumulative Probability ◽  
Surface Moisture ◽  
The North ◽  
Specific Configuration

Aeolian sediment traps are widely used to estimate the total volume of wind-driven sediment transport, but also to study the vertical mass distribution of a saltating sand cloud. The reliability of sediment flux estimations from this data are dependent upon the specific configuration of the measurement compartments and the analysis approach used. In this study, we analyse the uncertainty of these measurements by investigating the vertical cumulative probability distribution and relative sediment flux derived from both wind-tunnel and field studies. Three existing datasets were used in combination with a newly acquired meteorological dataset, which was collected in combination with sediment fluxes from six different events, using three customized catchers at one of the beaches of Ameland in the north of The Netherlands. Fast-temporal data collected in a wind-tunnel shows that eq has a scattered pattern between impact and fluid threshold, but increases linearly with shear velocities above the fluid threshold. For finer sediment fractions, a larger portion of the sediment was transported closer to the surface compared to coarser sediment fractions. It was also shown that errors originating from the the distribution of the sampling compartments, specifically the location of the lowest sediment trap relative to the surface, can be identified using the relative sediment flux. In the field, surface conditions such as surface moisture, surface crusts or frozen surfaces have a more pronounced, but localized effect, than shear velocity. Uncertainty in aeolian mass flux estimates can be reduced by placing multiple compartments in closer proximity to the surface.

Emerging research directions for n-type conjugated polymers

2019 ◽  
Vol 7 (41) ◽  
pp. 12809-12821 ◽  
Author(s):  
Hanyu Jia ◽  
Ting Lei
Keyword(s):  
Conjugated Polymers ◽  
Recent Progress ◽  
Research Directions

This review highlights the important role and recent progress of n-type conjugated polymers in several emerging research directions.

scholarly journals A Survey of Recent Progress in the Study of Distributed High-Order Linear Multi-Agent Coordination

2014 ◽  
Vol 18 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Jie Huang ◽  
◽  
Hao Fang ◽  
Jie Chen ◽  
Lihua Dou ◽  
...  
Keyword(s):  
Recent Progress ◽  
Second Order ◽  
High Order ◽  
Open Problems ◽  
Research Directions ◽  
Order Linear ◽  
Agent Systems ◽  
Multi Agent ◽  
Agent Coordination

Most previous studies ofmulti-agent systems only considered the first- and second-order dynamics. In this review, we present the major results and progress related to distributed high-order linear multi-agent coordination. We also discuss the current challenges and propose several promising research directions, as well as open problems that demand further investigation.

scholarly journals Tracking climate signals in varved lake sediments: research strategy and key sites for comprehensive process studies in the Masurian Lakeland

2017 ◽  
Vol 17 (3) ◽  
pp. 159-166 ◽  
Author(s):  
Wojciech Tylmann ◽  
Paulina Głowacka ◽  
Agnieszka Szczerba
Keyword(s):  
High Resolution ◽  
Lake Sediments ◽  
Sediment Cores ◽  
Monitoring Program ◽  
Sediment Traps ◽  
Research Strategy ◽  
Meteorological Conditions ◽  
Lake Basin ◽  
Climate Signals ◽  
Process Studies

AbstractLake sediments are excellent archives of environmental and climate change. Especially important are varved sediments which can provide high-resolution (annual) records of those changes. Process studies including limnological measurements, particle flux monitoring and analyses of sediment structures give an opportunity to explain relationships between meteorological conditions, in-lake processes and varve formation. In our study, three lakes were selected in the Masurian Lakeland: Lake Żabińskie, Łazduny and Rzęśniki. These relatively small and deep lakes contain well preserved biogenic varves. The lakes are influenced by the same meteorological conditions but differ in terms of their catchment size, land use, hydrology, lake basin morphology and trophic status. To explore the relationships between different parameters and preservation/transformation of climate signals in the sediments we started systematic limnological measurements in the water column of these lakes, water sampling for hydrochemical analyses, monitoring of modern sedimentation using sediment traps and analysis of topmost varves from short sediment cores. With this comprehensive and high-resolution monitoring program scheduled for at least four years we are going to verify the potential of varves to track short-term meteorological phenomena in lake sediments.

Metal-based electrocatalytic conversion of CO2 to formic acid/formate

2020 ◽  
Vol 8 (42) ◽  
pp. 21947-21960 ◽  
Author(s):  
Peng Ding ◽  
Haitao Zhao ◽  
Tingshuai Li ◽  
Yongsong Luo ◽  
Guangyin Fan ◽  
...  
Keyword(s):  
Formic Acid ◽  
Recent Progress ◽  
Future Research ◽  
Research Directions ◽  
The Future ◽  
Future Research Directions

This review summarizes recent progress in the development of metal-based electrocatalysts for the reduction of CO2 to formic acid/formate. The current challenges and the future research directions of metal-based materials are also proposed.

A Review on Ternary Bismuthate Nanoscale Materials

2020 ◽  
Vol 14 ◽  
Author(s):  
Lizhai Pei ◽  
Chunhu Yu ◽  
Zeyang Xue ◽  
Yong Zhang
Keyword(s):  
Large Scale ◽  
Recent Progress ◽  
Low Cost ◽  
Sol Gel ◽  
Future Research ◽  
Nanoscale Materials ◽  
Hydrothermal Route ◽  
Exchange Method ◽  
Research Directions ◽  
Application Potential

Background: Bismuth-containing nanoscale materials exhibit great application potential in catalysts, optical devices, electron devices, photo-electric devices and sensors owing to their good catalytic, optical, electric, photoelectric and sensing performance. Special research interest has been devoted to ternary bismuthate nanoscale materials due to their special layered structure, large specific surface area, excellent optical, catalytic, electrical and electrochemical performance. Therefore, it is essential to synthesize novel ternary bismuthate nanoscale materials for practical application. Methods: The article reviews the recent progress and patents on the ternary bismuthate nanoscale materials. The recent progress and patents on the synthesis and application of the ternary bismuthate nanoscale materials are discussed. The possible development direction of the ternary bismuthate nanoscale materials for the synthesis and application is also analyzed. Results: The ternary bismuthate nanoscale materials including zinc bismuthate, copper bismuthate, barium bismuthate, silver bismuthate, sodium bismuthate, lanthanum bismuthate nanoscale materials can be synthesized by hydrothermal route, sol-gel route, solvothermal decomposition route and ion-exchange method et al. The ternary bismuthate nanoscale materials exhibit great application promising in the fields of photocatalysts, sensors and batteries et al. Conclusion: Large-scale synthesis of ternary bismuthate nanoscale materials at low cost, doping and combination using different nanoscale materials are important research directions for future research.

Sign in / Sign up

Export Citation Format

Share Document