Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

2017 ◽  
Vol 5 (3) ◽  
pp. 1268-1281 ◽  
Author(s):  
A. Petra Dral ◽  
Kristianne Tempelman ◽  
Emiel J. Kappert ◽  
Louis Winnubst ◽  
Nieck E. Benes ◽  
...  
Keyword(s):  
Gas Separation ◽  
Structural Evolution

Long-term ongoing consolidation is unravelled for microporous hybrid organosilica membranes, showing chemical, structural and micropore evolution.

scholarly journals Avian MHC Evolution in the Era of Genomics: Phase 1.0

Cells ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1152 ◽  
Author(s):  
Emily A. O’Connor ◽  
Helena Westerdahl ◽  
Reto Burri ◽  
Scott V. Edwards
Keyword(s):  
High Throughput ◽  
High Throughput Sequencing ◽  
Structural Evolution ◽  
Great Depth ◽  
Long Read ◽  
Ecological Patterns ◽  
In The Wild ◽  
The Many ◽  
Avian Mhc

Birds are a wonderfully diverse and accessible clade with an exceptional range of ecologies and behaviors, making the study of the avian major histocompatibility complex (MHC) of great interest. In the last 20 years, particularly with the advent of high-throughput sequencing, the avian MHC has been explored in great depth in several dimensions: its ability to explain ecological patterns in nature, such as mating preferences; its correlation with parasite resistance; and its structural evolution across the avian tree of life. Here, we review the latest pulse of avian MHC studies spurred by high-throughput sequencing. Despite high-throughput approaches to MHC studies, substantial areas remain in need of improvement with regard to our understanding of MHC structure, diversity, and evolution. Recent studies of the avian MHC have nonetheless revealed intriguing connections between MHC structure and life history traits, and highlight the advantages of long-term ecological studies for understanding the patterns of MHC variation in the wild. Given the exceptional diversity of birds, their accessibility, and the ease of sequencing their genomes, studies of avian MHC promise to improve our understanding of the many dimensions and consequences of MHC variation in nature. However, significant improvements in assembling complete MHC regions with long-read sequencing will be required for truly transformative studies.

scholarly journals Spectral Characteristics of RV Tauri Stars

2000 ◽  
Vol 177 ◽  
pp. 117-125 ◽  
Author(s):  
Sunetra Giridhar
Keyword(s):  
Gas Separation ◽  
Spectroscopic Investigation ◽  
Spectral Characteristics ◽  
Spectroscopic Properties ◽  
Chemical Compositions ◽  
Agb Stars ◽  
Abundance Pattern ◽  
Rv Tau Stars ◽  
Long Term Variations

Spectroscopic properties of RV Tau variables are summarized. We report on our detailed spectroscopic investigation of a sample of RV Tau stars covering all three RV Tau subgroups. Though the observed abundance pattern is similar to those of a few post-AGB stars, we find considerable variation in the observed chemical compositions indicating that there is some non-homogeneity among subgroups of RV Tau variables. Possible scenarios of dust-gas separation in the material ejected by the dusty wind are discussed to explain the observed abundances. This mechanism would work better if the star happens to possess a binary companion. Interestingly, one of our sample stars, EP Lyr, shows long-term variations in radial velocity possibly caused by the presence of a companion.

Structural evolution and the capacity fade mechanism upon long-term cycling in Li-rich cathode material

2012 ◽  
Vol 14 (37) ◽  
pp. 12875 ◽  
Author(s):  
Bohang Song ◽  
Zongwen Liu ◽  
Man On Lai ◽  
Li Lu
Keyword(s):  
Cathode Material ◽  
Structural Evolution ◽  
Capacity Fade

scholarly journals Multi-temporal airborne structure-from-motion on caldera rim: Hazard, visitor exposure and origins of instabilities at Piton de la Fournaise

2018 ◽  
Vol 43 (2) ◽  
pp. 193-214 ◽  
Author(s):  
Allan Derrien ◽  
Nicolas Villeneuve ◽  
Aline Peltier ◽  
Laurent Michon
Keyword(s):  
Large Scale ◽  
Structural Evolution ◽  
Summit Crater ◽  
Caldera Collapse ◽  
Mass Wasting ◽  
Piton De La Fournaise ◽  
Aerial Photogrammetry ◽  
Multi Temporal ◽  
Horizontal Ground Motion

Piton de la Fournaise is one of the world’s most active and visited volcanoes. Its summit crater (Cratère Dolomieu), the main tourist attraction, underwent a major caldera collapse in 2007 and its rim is not yet stabilized. In order to assess the caldera rim instability risk for visitors, we followed its structural evolution from 2007 to 2015. Using aerial photogrammetry campaigns, we mapped the unstable sites very precisely, carried out a quantitative analysis of the temporal evolution of these instabilities, and assessed the risks for visitors. Considering the 2008–2015 period, four sites close to the crater’s edge showed significant horizontal ground motion (0.5–2 m), fracture widening (average of 0.3–0.56 m) and large-scale mass wasting volumes (total of 1.8±0.1 × 106 m3). We infer two different processes at work: (1) to the west and north, toppling of the basalt units occurs after periods of fracture widening due to the combined effect of magmatic intrusions and long-term inflation/deflation cycles; (2) to the south and east, parts of the caldera rim slowly slide towards the caldera centre, with significant accelerations during periods of enhanced volcanic activity (in 2008–2010 and 2014–2015). The official observation platform is the most stable zone to overlook the Cratère Dolomieu. By contrast, the most frequently visited area of the rim (northwest) outside the official platform is also the most unstable.

In situ characterization of metals at extremes

MRS Bulletin ◽  
2010 ◽  
Vol 35 (12) ◽  
pp. 1009-1016 ◽  
Author(s):  
N. D. Browning ◽  
G. H. Campbell ◽  
J. A. Hawreliak ◽  
M. A. Kirk
Keyword(s):  
Structural Evolution ◽  
Extreme Conditions ◽  
Long Term Effects ◽  
Recent Developments ◽  
Definition Of ◽  
Radiation Conditions ◽  
Temperature Strain

The fundamental processes taking place in metals under extreme conditions can occur on ultrafast timescales (i.e., nanoseconds to picoseconds), and yet their result can continue to have a significant impact on the structural properties for many years to follow. The challenge in developing in situ methods for characterization under extreme conditions therefore involves both the modification of the instrumentation to implement the high-temperature, strain, and radiation conditions and the definition of the timescale over which the measurement must be made. While techniques are well established for characterization of the long-term effects of extreme conditions, experiments are only just beginning to probe the initial stages of structural evolution. This article reviews recent developments in optical, x-ray, and electron probes of metals under extreme conditions and also discusses the needs for future experiments and potential pathways to achieving these goals.

Long-term hydrogen storage performance and structural evolution of LaNi4Al alloy

2018 ◽  
Vol 731 ◽  
pp. 172-180 ◽  
Author(s):  
Jingjing Liu ◽  
Zhi Zheng ◽  
Honghui Cheng ◽  
Kang Li ◽  
Kai Yan ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Structural Evolution ◽  
Storage Performance ◽  
Hydrogen Storage Performance

Structural Evolution of Lanthanum Hydroxides during Long-Term Phosphate Mitigation: Effect of Nanoconfinement

2020 ◽  
Vol 55 (1) ◽  
pp. 665-676 ◽  
Author(s):  
Yanyang Zhang ◽  
Minglu Wang ◽  
Xiang Gao ◽  
Jieshu Qian ◽  
Bingcai Pan
Keyword(s):  
Structural Evolution

scholarly journals Pre-combustion gas separation by ZIF-8-polybenzimidazole mixed matrix membranes in the form of hollow fibres—long-term experimental study

2021 ◽  
Vol 8 (9) ◽  
pp. 210660
Author(s):  
Adelaida Perea-Cachero ◽  
Miren Etxeberría-Benavides ◽  
Oana David ◽  
Adam Deacon ◽  
Timothy Johnson ◽  
...  
Keyword(s):  
Gas Separation ◽  
Hollow Fibre ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Combustion Gas ◽  
Hollow Fibres ◽  
Operation Conditions ◽  
Matrix Membranes

Polybenzimidazole (PBI) is a promising and suitable membrane polymer for the separation of the H 2 /CO 2 pre-combustion gas mixture due to its high performance in terms of chemical and thermal stability and intrinsic H 2 /CO 2 selectivity. However, there is a lack of long-term separation studies with this polymer, particularly when it is conformed as hollow fibre membrane. This work reports the continuous measurement of the H 2 /CO 2 separation properties of PBI hollow fibres, prepared as mixed matrix membranes with metal-organic framework (MOF) ZIF-8 as filler. To enhance the scope of the experimental approach, ZIF-8 was synthesized from the transformation of ZIF-L upon up-scaling the MOF synthesis into a 1 kg batch. The effects of membrane healing with poly(dimethylsiloxane), to avoid cracks and non-selective gaps, and operation conditions (use of sweep gas or not) were also examined at 200°C during approximately 51 days. In these conditions, for all the membrane samples studied, the H 2 permeance was in the 22–47 GPU range corresponding to 22–32 H 2 /CO 2 selectivity values. Finally, this work continues our previous report on this type of application (Etxeberria-Benavides et al . 2020 Sep. Purif. Technol. 237 , 116347 ( doi:10.1016/j.seppur.2019.116347 )) with important novelties dealing with the use of ZIF-8 for the mixed matrix membrane coming from a green methodology, the long-term gas separation testing for more than 50 days and the study on the membrane operation under more realistic conditions (e.g. without the use of sweep gas).

scholarly journals Effect of long-term cyclic compression loading on the structural evolution of trabecular bone

2021 ◽  
pp. 100099
Author(s):  
Yan Gao ◽  
Feixiang Lu ◽  
Shouhui Wang ◽  
Lianwen Sun ◽  
Huijie Leng ◽  
...  
Keyword(s):  
Trabecular Bone ◽  
Structural Evolution ◽  
Compression Loading ◽  
Cyclic Compression
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