Gamification of complex morphology learning: the case of Turkish

2021 ◽  
pp. 1-29
Author(s):  
Gülşen Eryiğit ◽  
Fatih Bektaş ◽  
Ubey Ali ◽  
Bihter Dereli
Keyword(s):  
Complex Morphology ◽  
Morphology Learning

scholarly journals Altered K-complex morphology during sustained inspiratory airflow limitation is associated with next-day lapses in vigilance in obstructive sleep apnea

SLEEP ◽  
2021 ◽  
Author(s):  
Ankit Parekh ◽  
Korey Kam ◽  
Anna E Mullins ◽  
Bresne Castillo ◽  
Asem Berkalieva ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Spectral Characteristics ◽  
Sleep Time ◽  
Airflow Limitation ◽  
Apnea Hypopnea Index ◽  
Complex Morphology ◽  
Obstructive Sleep ◽  
Inspiratory Airflow Limitation ◽  
Psychomotor Vigilance

Abstract Study Objectives Determine if changes in K-complexes associated with sustained inspiratory airflow limitation (SIFL) during N2 sleep are associated with next-day vigilance and objective sleepiness. Methods Data from thirty subjects with moderate-to-severe obstructive sleep apnea who completed three in-lab polysomnograms: diagnostic, on therapeutic continuous positive airway pressure (CPAP), and on suboptimal CPAP (4 cmH2O below optimal titrated CPAP level) were analyzed. Four 20-min psychomotor vigilance tests (PVT) were performed after each PSG, every 2 h. Changes in the proportion of spontaneous K-complexes and spectral characteristics surrounding K-complexes were evaluated for K-complexes associated with both delta (∆SWAK), alpha (∆αK) frequencies. Results Suboptimal CPAP induced SIFL (14.7 (20.9) vs 2.9 (9.2); %total sleep time, p < 0.001) with a small increase in apnea–hypopnea index (AHI3A: 6.5 (7.7) vs 1.9 (2.3); p < 0.01) versus optimal CPAP. K-complex density (num./min of stage N2) was higher on suboptimal CPAP (0.97 ± 0.7 vs 0.65±0.5, #/min, mean ± SD, p < 0.01) above and beyond the effect of age, sex, AHI3A, and duration of SIFL. A decrease in ∆SWAK with suboptimal CPAP was associated with increased PVT lapses and explained 17% of additional variance in PVT lapses. Within-night during suboptimal CPAP K-complexes appeared to alternate between promoting sleep and as arousal surrogates. Electroencephalographic changes were not associated with objective sleepiness. Conclusions Sustained inspiratory airflow limitation is associated with altered K-complex morphology including the increased occurrence of K-complexes with bursts of alpha as arousal surrogates. These findings suggest that sustained inspiratory flow limitation may be associated with nonvisible sleep fragmentation and contribute to increased lapses in vigilance.

Phosphorescence of naphthalene-labelled colloidal polymer particles. The α-methyl relaxation of one microphase in a multicomponent material

1985 ◽  
Vol 63 (1) ◽  
pp. 129-133 ◽  
Author(s):  
Mitchell A. Winnik ◽  
Onder Pekcan ◽  
M. D. Croucher
Keyword(s):  
Decay Process ◽  
Relaxation Processes ◽  
Pure Pmma ◽  
Phosphorescence Quenching ◽  
Complex Morphology ◽  
Freeze Dried ◽  
Decay Times ◽  
Powder Samples ◽  
Pmma Particles ◽  
Multicomponent Material

Nonaqueous dispersions of poly(methyl methacrylate) (PMMA) particles, sterically stabilized with polyisobutylene (PIB), were prepared with naphthalene (N) groups covalently incorporated into the PMMA chains. These materials have a complex morphology of phase-separated PMMA and PIB microdomains, with the N groups in the PMMA microphases. The phosphorescence intensity and decay times of the N groups were measured as a function of temperature over the range 77–295 K for dispersions in methylcyclohexane and for freeze-dried powder samples. An Arrhenius treatment of the radiationlcss decay rate showed a change in slope at −35 °C. The activation energy for the radiationless decay process is 3.8 kcal/mol in the −35 – +22 °C temperature region, identical to that found for pure PMMA by nmr for chain motion associated with the a-methyl relaxation process. We believe that the phosphorescence experiment is sensitive to the diffusion of oxygen and other impurities in the sample. These rates increase as the temperature is raised, enhancing the rate of phosphorescence quenching. These experiments indicate that phosphorescence measurements on labelled samples are suitable for studying relaxation processes within individual microphases of a polyphasic composite material.

In-situ observation of microscopic motions and structure dynamic transformation of wax crystals in waxy crude oil subjected to shear

2021 ◽  
Author(s):  
Jian Zhao ◽  
Xiangrui Xi ◽  
Hang Dong ◽  
Yuanhao Li ◽  
Minzheng Jiang
Keyword(s):  
Crude Oil ◽  
In Situ Observation ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Complex Morphology ◽  
Dynamic Transformation ◽  
Structure Dynamic ◽  
High Efficient ◽  
Wax Crystals

The high-efficient development, storage and transportation of waxy crude oil has a significant meaning for stable supplying of petroleum energy. The variety of complex morphology and microstructure of wax crystals...

Resorption of bone by isolated rabbit osteoclasts

1984 ◽  
Vol 66 (1) ◽  
pp. 383-399
Author(s):  
T.J. Chambers ◽  
P.A. Revell ◽  
K. Fuller ◽  
N.A. Athanasou
Keyword(s):  
Indirect Effects ◽  
Cytochalasin B ◽  
Model System ◽  
Long Bones ◽  
Direct And Indirect Effects ◽  
Bone Surface ◽  
Surface Appearance ◽  
Complex Morphology ◽  
Resorptive Activity ◽  
Circular Outline

A carborundum wheel was used to prepare slices of cortical bone that demonstrate a predictable surface appearance in the scanning electron microscope. Osteoclasts were mechanically disaggregated from neonatal rabbit long bones and settled onto these slices. After 24h in culture osteoclasts were associated with areas of excavation in the bone surface. These excavated areas typically showed a well-defined outline and a distinctive fibrillar base, which resembled the pattern of collagen fibrils in bone. The majority of such concavities were of approximately circular outline and of smaller diameter than the associated osteoclast, but other excavations were elongated or of complex morphology, and may have been produced by osteoclasts that were resorbing bone while they migrated. Irregular concavities tended to be more shallow but to occupy a greater area of the bone surface than circular concavities. Roughening of the bone surface without detectable excavation was also seen adjacent to osteoclasts. Calcitonin and cytochalasin B, which inhibit osteoclastic motility, also inhibited bone resorptive activity by these cells. The techniques described in this paper represent a model system with which to assess the direct and indirect effects of hormones, cells and substrate composition on the induction, stimulation and inhibition of osteoclastic bone resorption and to investigate the mechanisms by which cells degrade extracellular matrices.

Drop Impact onto Dry Surfaces with Complex Morphology

2017 ◽  
pp. 155-252
Author(s):  
Alexander L. Yarin ◽  
Ilia V. Roisman ◽  
Cameron Tropea
Keyword(s):  
Drop Impact ◽  
Complex Morphology

Cryptic speciation in a biodiversity hotspot: multilocus molecular data reveal new velvet worm species from Western Australia (Onychophora : Peripatopsidae : Kumbadjena)

2018 ◽  
Vol 32 (6) ◽  
pp. 1249 ◽  
Author(s):  
Shoyo Sato ◽  
Rebecca S. Buckman-Young ◽  
Mark S. Harvey ◽  
Gonzalo Giribet
Keyword(s):  
Western Australia ◽  
18S Rrna ◽  
Mitochondrial Protein ◽  
Molecular Data ◽  
12S Rrna ◽  
Protein Coding ◽  
Complex Morphology ◽  
Velvet Worm ◽  
Three New Species ◽  
Western Australian

There is a yet uncovered multitude of species to be found among Western Australian Onychophora. Kumbadjena, one of the two genera that reside in this region, has been previously suggested to house an extensive species complex. Morphology alone has not been able to elucidate the diversity in this genus and has instead muddled species delineations. Topologies and species delimitation analyses resulting from the sequences of two mitochondrial ribosomal markers (12S rRNA and 16S rRNA), one nuclear ribosomal marker (18S rRNA), and one mitochondrial protein-coding gene (cytochrome c oxidase subunit I) are indicative of several undescribed species. Fixed diagnostic nucleotide changes in the highly conserved sequences of 18S rRNA warrant distinction of three new species of Kumbadjena: K. toolbrunupensis, sp. nov., K. karricola, sp. nov., and K. extrema, sp. nov. The geographic distributions of the proposed species suggest that Kumbadjena is another example of short-range endemism, a common occurrence in the flora and fauna of the region. The extensive biodiversity and endemism in the region necessitates conservation to preserve the species and processes that promote speciation harboured by Western Australia.

scholarly journals The complex basal morphology and ice dynamics of Nansen Ice Shelf, East Antarctica

2021 ◽  
Author(s):  
Christine F. Dow ◽  
Derek Mueller ◽  
Peter Wray ◽  
Drew Friedrichs ◽  
Alexander L. Forrest ◽  
...  
Keyword(s):  
Large Scale ◽  
Radar Data ◽  
Suture Zone ◽  
East Antarctica ◽  
Strain Rates ◽  
Floating Bodies ◽  
Ice Shelf ◽  
Ice Dynamics ◽  
Complex Morphology ◽  
Hydrostatic Balance

Abstract. Ice shelf dynamics and morphology play an important role in the stability of floating bodies of ice, in turn impacting their ability to buttress upstream grounded ice. We use a combination of satellite-derived data, airborne and ground-based radar data, and oceanographic data collected at the Nansen Ice Shelf in East Antarctica to examine the spatial variations in ice shelf draft, the cause and effects of ice shelf strain rates, and the role of a suture zone driving channelization of ocean water and resulting sub-ice shelf melt and freeze-on. We also use the datasets to assess limitations that may arise from examining only a sub-set of the data, in particular the reliance on hydrostatic balance equations applied to surface digital elevation models to determine ice draft morphology. We find that the Nansen Ice Shelf has highly variable basal morphology driven primarily by the formation of basal crevasses near the onset of floating ice convergence in the suture zone. This complex morphology is reflected in the ice shelf strain rates but not in the calculated hydrostatic balance thickness, which underestimates the scale of vertical and horizontal variability at the ice shelf base. The combination of thinner ice in the channelized suture zone, enhanced melt rates near the ice shelf edge, and complex strain rates driven by ice dynamics and morphology have led to the formation of fractures within the suture zone that have resulted in large-scale calving events. Other Antarctic ice shelves may also have complex morphology, which is not reflected in the satellite data, yet may influence their stability.

Sign in / Sign up

Export Citation Format

Share Document