scholarly journals A multi-proxy approach to assessing isolation basin stratigraphy from the Lofoten Islands, Norway

2011 ◽  
Vol 75 (1) ◽  
pp. 288-300 ◽  
Author(s):  
Nicholas L. Balascio ◽  
Zhaohui Zhang ◽  
Raymond S. Bradley ◽  
Bianca Perren ◽  
Svein Olaf Dahl ◽  
...  
Keyword(s):  
Sea Level ◽  
Threshold Elevation ◽  
Coastal Lake ◽  
New Techniques ◽  
X Ray ◽  
Lofoten Islands ◽  
Marine Influence ◽  
Bulk Organic Matter ◽  
Transitional Phase ◽  
Isolation Basin

AbstractThis study takes a comprehensive approach to characterizing the isolation sequence of Heimerdalsvatnet, a coastal lake in the Lofoten Islands, northern Norway. We use established methods and explore new techniques to assess changes in marine influence. Bathymetric and sub-bottom profiles were acquired to examine basin-wide sedimentation and a 5.8 m sediment core spanning the last 7800 cal yr BP was analyzed. We measured magnetic susceptibility, bulk organic matter properties, molecular biomarkers, diatom assemblages, and elemental profiles acquired by scanning X-ray fluorescence. These characteristics of the sediment reflect detailed changes in salinity and water column conditions as the lake was progressively isolated. Three distinct litho/chemo-stratigraphic units represent a restricted marine phase (7800–6500 cal yr BP), a transitional phase characterized by intermittent marine influence (6500–4900 cal yr BP), and complete isolation and freshwater sedimentation (4900 cal yr BP to present). Although there are uncertainties in the estimate of the threshold elevation of the lake, the timing of these phases generally corresponds with previous interpretations of the local relative sea-level history. This record captures sea-level regression following the Tapes transgression and supports the interpretation of a subsequent sea-level stillstand, dated in Heimerdalsvatnet from 6500 to 4900 cal yr BP.

Detection of Extent of Sea Level Rise in a Coastal Lake System using IRS Satellite Imagery

2013 ◽  
Vol 27 (7) ◽  
pp. 2657-2670 ◽  
Author(s):  
A. M. Sheela ◽  
J. Letha ◽  
Joseph Sabu ◽  
K. K. Ramachandran ◽  
J. Justus
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Satellite Imagery ◽  
Coastal Lake ◽  
Lake System

A 6000-year record of ecological and hydrological changes from Laguna de la Leche, north coastal Cuba

2007 ◽  
Vol 67 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Matthew C. Peros ◽  
Eduard G. Reinhardt ◽  
Anthony M. Davis
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Plant Macrofossils ◽  
Water Levels ◽  
Loss On Ignition ◽  
Coastal Lake ◽  
Freshwater Gastropods ◽  
Level Increase ◽  
Pollen Rain ◽  
Calcareous Microfossils

AbstractLaguna de la Leche, north coastal Cuba, is a shallow (≤ 3 m), oligohaline (∼ 2.0–4.5‰) coastal lake surrounded by mangroves and cattail stands. A 227-cm core was studied using loss-on-ignition, pollen, calcareous microfossils, and plant macrofossils. From ∼6200 to ∼ 4800 cal yr BP, the area was an oligohaline lake. The period from ∼ 4800 to ∼ 4200 cal yr BP saw higher water levels and a freshened system; these changes are indicated by an increase in the regional pollen rain, as well as by the presence of charophyte oogonia and an increase in freshwater gastropods (Hydrobiidae). By ∼ 4000 cal yr BP, an open mesohaline lagoon had formed; an increase in salt-tolerant foraminifers suggests that water level increase was driven by relative sea level rise. The initiation of Laguna de la Leche correlates with a shift to wetter conditions as indicated in pollen records from the southeastern United States (e.g., Lake Tulane). This synchronicity suggests that sea level rise caused middle Holocene environmental change region-wide. Two other cores sampled from mangrove swamps in the vicinity of Laguna de la Leche indicate that a major expansion of mangroves was underway by ∼ 1700 cal yr BP.

scholarly journals Potentiality for Efficacy Increase in Treat­ment of Diaphysial Shin Fractures Based on Ilizarov Technique

2005 ◽  
Vol 12 (1) ◽  
pp. 11
Author(s):  
A. G Guseinov
Keyword(s):  
Dynamic Compression ◽  
Axial Loading ◽  
Main Group ◽  
Control Group ◽  
Ilizarov Technique ◽  
New Techniques ◽  
X Ray ◽  
Ilizarov Apparatus ◽  
Duration Of Hospitalization ◽  
Bone Fragments

In treatment of 87 patients (main group) with diaphysial shin fractures new techniques and devices for optimization of transosseous extrafocal osteosynthesis by Ilizarov were applied. All techniques and devices, i.e. devices for the perfection of Ilizarov apparatus stability, for bone fragment reposition, console compression arrangement for extrafocal osteosynthesis in commi­nuted fractures, devices for damper compression of bone fragments, for prevention of lower extremity edema at extrafocal osteosynthesis, for provision of early axial loading in Ilizarov apparatus, for activization of osteogenesis using asymmetrical dynamic compression were elabo­rated by the author. Control group (108 patients) was treated by traditional Ilizarov technique. Treatment results were assessed at terms from 4 months to 2 years. Data of clinical, X-ray and functional examinations as well as terms of fracture healing, duration of hospitalization and terms of working ability restoration were better in the main group as compared to the control one. In the main group good results were achieved in 47.1%c, satisfactory — in 49.4%, poor — in 3.5% of cases, in control group — 30.6%, 63.0%, 6.4%, respectively. Author believes that further perfection of Ilizarov technique is reasonable.

scholarly journals Formation of Pharmaceutical Salts and Cocrystals via Vapour-Assisted Tumbling (VAT) – A Solvent Efficient Process with Potential Industrial Applications

2021 ◽  
Author(s):  
Alexander J. Stirk ◽  
Fabio E. S. Souza ◽  
Jenny Gerster ◽  
Fatemeh M. Mir ◽  
Avedis Karadeolian ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Environmental Impact ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
New Techniques ◽  
X Ray ◽  
Industry Standard ◽  
Pharmaceutical Salts ◽  
Solid Form

Crystallisations on both the academic and industrial scale often use large volumes of solvent. In order decrease the environmental impact of such processes, new techniques must be discovered that increase the efficiency of the solvents used. Introduced here is a process that combines repurposed industry standard hardware and aspects of mechanochemistry to produce a technique we call “Vapour Assisted Tumbling” (VAT). Pharmaceutical and well-known cocrystals and salts were formed by tumbling the coformers in an atmosphere of vaporised solvent, in this study, methanol (MeOH). This was done inside a custom built analogue of an industrial rotary cone dryer (RCD). It was found that a desired solid form could be obtained as monitored by powder X-ray diffraction and differential scanning calorimetry. By repurposing industrial RCDs, it is feasible that solid forms can be crystallised with both minimal and reusable/recyclable solvent – drastically lowering the environmental impact of such transformations.

scholarly journals Serial Electron Diffraction Data Processing With diffractem and CrystFEL

2021 ◽  
Vol 8 ◽  
Author(s):  
Robert Bücker ◽  
Pascal Hogan-Lamarre ◽  
R. J. Dwayne Miller
Keyword(s):  
Electron Diffraction ◽  
Data Processing ◽  
Three Dimensional ◽  
Electron Diffraction Data ◽  
New Techniques ◽  
X Ray ◽  
X Ray Crystallography ◽  
Level Of Automation ◽  
Rotation Method ◽  
High Level

Serial electron diffraction (SerialED) is an emerging technique, which applies the snapshot data-collection mode of serial X-ray crystallography to three-dimensional electron diffraction (3D Electron Diffraction), forgoing the conventional rotation method. Similarly to serial X-ray crystallography, this approach leads to almost complete absence of radiation damage effects even for the most sensitive samples, and allows for a high level of automation. However, SerialED also necessitates new techniques of data processing, which combine existing pipelines for rotation electron diffraction and serial X-ray crystallography with some more particular solutions for challenges arising in SerialED specifically. Here, we introduce our analysis pipeline for SerialED data, and its implementation using the CrystFEL and diffractem program packages. Detailed examples are provided in extensive supplementary code.

Statistical Errors in X-Ray Triaxial Stress Analysis by Cos α Method

2021 ◽  
Vol 1016 ◽  
pp. 423-428
Author(s):  
Shoichi Ejiri ◽  
Hiroaki Ohba ◽  
Toshihiko Sasaki
Keyword(s):  
Stress State ◽  
Stress Analysis ◽  
Measurement Theory ◽  
Triaxial Stress ◽  
X Ray Diffraction ◽  
New Techniques ◽  
X Ray ◽  
Statistical Errors ◽  
Residual Stress State ◽  
Metal Materials

Currently, the sin2ψ method is established as an effective technique as how to measure the residual stress state of metal materials non-destructively by X-ray diffraction. In recent years, new X-ray stress measurements with two-dimensional detector are developed and spreading in the world. There is the cosα method as one of the new techniques. However, the research about the statistical errors in the method continues. The measurement theory of the cos α method is reviewed on the triaxial stress state. The triaxial stress analysis by the method is examined and discussed from a viewpoint of the derived errors for the determination.

New techniques for the measurement of x-ray beam or x-ray optics quality

2003 ◽  
Author(s):  
Philippe Zeitoun ◽  
Philippe Balcou ◽  
Samuel Bucourt ◽  
Djamel Benredjem ◽  
Franck Delmotte ◽  
...  
Keyword(s):  
New Techniques ◽  
Ray Optics ◽  
X Ray

scholarly journals Geomorphological Insight of Some Ice Free Areas of Eastern Antarctica

2020 ◽  
Author(s):  
Rasik Ravindra ◽  
Badanal Siddaiah Mahesh ◽  
Rahul Mohan
Keyword(s):  
Sea Level ◽  
Climatic Variation ◽  
The Other ◽  
Marine Transgression ◽  
Close Vicinity ◽  
Larsemann Hills ◽  
Schirmacher Oasis ◽  
Melt Water ◽  
Marine Influence ◽  
Ice Sheet Dynamics

The Schirmacher Oasis and Larsemann Hills are among the few significant ice free areas of East Antarctica that are conspicuous due to presence of more than a hundred melt water lakes each, preserving the signatures of climatic variation and deglaciation history since Last Glacial Maximum (19 to 24 ky BP) and beyond. There are evidences, recorded in the lake sediments of low lying Larsemann Hills, of marine transgression due to variation in sea level, isostatic upliftment and close vicinity of the Hills to the marine environment. The Schirmacher Oasis, on the other hand has preserved various landforms-both erosional and depositional- typical of a periglacial environment along with proglacial lakes (incorporating signals of ice-sheet dynamics) and epishelf lakes (signatures of marine influence) .

scholarly journals Topographical evaluation of laser generated surfaces using statistical analysis of surface-normal vector distributions

2021 ◽  
Vol 1135 (1) ◽  
pp. 012023
Author(s):  
Rickard Olsson ◽  
John Powell ◽  
Jan Frostevarg ◽  
Alexander F.H. Kaplan
Keyword(s):  
Surface Roughness ◽  
Measurement Techniques ◽  
Considerable Effect ◽  
Normal Vector ◽  
Micro Ct ◽  
Micro Computed Tomography ◽  
New Techniques ◽  
X Ray ◽  
Independent Analysis ◽  
Surface Profiles

Abstract Surfaces generated by Additive Manufacturing or laser texturing can involve the solidification of droplets of liquid, which can give rise to overhanging features on the solidified surface. Overhanging features add a layer of complexity to the surface topography and are undetectable by standard surface roughness measurement techniques such as profilometry. Such features are important because they can have a considerable effect on surface properties such as wettability. New techniques and algorithms are therefore required to analyse and quantify convoluted surfaces with overhanging (re-entrant) features. Earlier work by the authors introduced the concept of using X-ray micro-computed tomography (Micro-CT) to identify the directions of vectors normal to the surface at any point and thus indicate the presence or absence of overhanging features. This paper divides overhanging features into two types; simple and compound, and introduces new, size independent, analysis techniques which measure what proportion of each type is on the surface. Another extension of the analysis is the comparison of surface profiles taken in different directions in order to identify any surface roughness anisotropies.

LATE HOLOCENE SEA-LEVEL RECONSTRUCTION FOR THE LOFOTEN ISLANDS, NORWAY USING SEDIMENT RECORDS FROM ISOLATION BASINS

2019 ◽  
Author(s):  
Leah P. Marshall ◽  
◽  
Nicholas L. Balascio ◽  
William J. D'Andrea ◽  
Stephen Wickler
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Lofoten Islands ◽  
Sediment Records ◽  
Holocene Sea Level
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