Development of Spatial and Temporal Complexity in Langmuir Circulation

1986 ◽  
pp. 367-368 ◽  
Author(s):  
S. Leibovich ◽  
S. Lele ◽  
I. Moroz
Keyword(s):  
Langmuir Circulation ◽  
Temporal Complexity

An Alternate Algorithm for (3x3) Median Filtering of Digital Images

2012 ◽  
Vol 2 (1) ◽  
pp. 7-9 ◽  
Author(s):  
Satinderjit Singh
Keyword(s):  
Median Filter ◽  
Computational Cost ◽  
Spatial Coherence ◽  
General Purpose ◽  
Median Filtering ◽  
Basic Algorithm ◽  
Temporal Complexity ◽  
Filter Kernel ◽  
One Step ◽  
High Computational Cost

Median filtering is a commonly used technique in image processing. The main problem of the median filter is its high computational cost (for sorting N pixels, the temporal complexity is O(N·log N), even with the most efficient sorting algorithms). When the median filter must be carried out in real time, the software implementation in general-purpose processorsdoes not usually give good results. This Paper presents an efficient algorithm for median filtering with a 3x3 filter kernel with only about 9 comparisons per pixel using spatial coherence between neighboring filter computations. The basic algorithm calculates two medians in one step and reuses sorted slices of three vertical neighboring pixels. An extension of this algorithm for 2D spatial coherence is also examined, which calculates four medians per step.

SUSTAINING FAMILY ROUTINES AFTER TRANSITIONING INTO PARENTHOOD: COUPLES’ PERCEPTIONS OF ASSISTING FACTORS

2016 ◽  
Vol 28 (1) ◽  
pp. 3-17
Author(s):  
Christine De Goede ◽  
Abraham P Greeff
Keyword(s):  
Low Income ◽  
Transition To Parenthood ◽  
Specific Problem ◽  
Family Members ◽  
Major Theme ◽  
Structured Interviews ◽  
Theory Analysis ◽  
Family Routines ◽  
Temporal Complexity ◽  
Context Specific

The aim of this qualitative study was to explore what assists couples in sustaining family routines after the transition to parenthood. Participants were recruited from two day-care centres in Cape Town, South Africa. In-depth, semi-structured interviews were conducted with 10 couples, mostly from low-income households, who had gone through this transition between one and four years previously. Grounded theory analysis revealed one major theme, Factors that decrease task and temporal complexity, with seven subthemes: Support from the wider family network; Couple cooperation and tag-teaming; Planning and pre-empting future problems; Adhering to schedules; Facilitative characteristics and skills of individual family members; Parents’ sense of commitment and responsibility towards family members; and idiosyncratic accommodations. Results underscore the need for professionals to help parents gain support from relatives; strengthen partner teamwork; foster schedule consistency; improve skills such as planning; foster their caretaker self-concepts; and facilitate context-specific problem-solving.

scholarly journals A Parametric Approach for Determining Fishway Attraction Flow at Hydropower Dams

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 743
Author(s):  
Patrick Heneka ◽  
Markus Zinkhahn ◽  
Cornelia Schütz ◽  
Roman B. Weichert
Keyword(s):  
Input Data ◽  
Design Criterion ◽  
Hydraulic Parameters ◽  
Parametric Approach ◽  
Temporal Complexity ◽  
Hydropower Plants ◽  
Hydropower Dams ◽  
Migration Corridor ◽  
Zone Characteristic ◽  
Good Agreement

High discharges at hydropower plants (HPP) may mask fishway attraction flows and, thereby, prevent fishes from locating and using fishways critical for their access to upstream spawning and rearing habitats. Existing methods for determining attraction flows are either based on simple guidelines (e.g., a proportion of HPP discharge) that cannot address the spatial and temporal complexity of tailrace flow patterns or complicated studies (e.g., combinations of detailed hydraulic and biological investigations) that are expensive and time-consuming. To bridge this gap, we present a new, intermediate approach to reliably determine attraction flows for technical fishways at small to medium-sized waterways (mean annual flow up to 400 m3/s). Fundamental to our approach is a design criterion that the attraction flow should maintain its integrity as it propagates downstream from the fishway entrance to beyond the highly turbulent zone characteristic of HPP tailraces to create a discernable migration corridor connecting the fishway entrance to the downstream river. To implement this criterion, we describe a set of equations to calculate the width of the entrance and the corresponding attraction discharge. Input data are usually easy to obtain and include geometrical and hydraulic parameters describing the target HPP and its tailrace. To confirm our approach, we compare model results to four sites at German waterways where the design of attraction flow was obtained by detailed experimental and numerical methods. The comparison shows good agreement supporting our approach as a useful, intermediate alternative for determining attraction flows that bridges the gap between simple guidelines and detailed hydraulic and biological investigations.

scholarly journals Simplicity or complexity? Important aspects of high nature value grassland management in nature conservation

2021 ◽  
Author(s):  
Róbert Kun ◽  
Dániel Babai ◽  
András István Csathó ◽  
Csaba Vadász ◽  
Nikoletta Kálmán ◽  
...  
Keyword(s):  
Nature Conservation ◽  
Plant Diversity ◽  
Management Practices ◽  
Grassland Management ◽  
Plant Functional Types ◽  
Higher Plant ◽  
Temporal Complexity ◽  
Functional Types ◽  
Management Factors ◽  
Spatio Temporal

AbstractLocal, adaptive traditional grassland management systems have played a fundamental role in the creation, maintenance and conservation of high nature value (HNV) grasslands. The state of diverse HNV grasslands has deteriorated across Europe in conjunction with changes in various management factors, such as management type and management intensity. To conserve the species-rich vegetation of HNV grasslands and to avoid undesirable shifts in plant functional type dominance, it is important to explore the effects of management factors crucial for nature conservation and to adapt them to local circumstances. In our study, we focus on three of the main factors in the management of valuable meadow steppes in the Great Hungarian Plain region (Central Hungary). We studied management types (mowing, grazing and combined), different levels of herbage removal intensity (low, medium, high) and spatio-temporal complexity (low, medium and high) of grassland management. Altogether 172 plots (1 m × 1 m) were designated in 17 sites. Plant diversity indexes and plant functional types were calculated according to the presence and percentage cover of plant species in the plots. Regarding plant diversity and the dominance of plant functional types, herbage removal intensity and spatio-temporal complexity of management had, for the most part, stronger effects than the type of management. Higher spatio-temporal complexity of management resulted in higher plant diversity, while higher intensity of management led to significantly lower diversity. Proper application of type, intensity and spatio-temporal complexity of management practices (separately and in combination) proved to be determining factors in the long-term maintenance and conservation of diversity and species composition of HNV grasslands.

Differences in temporal reasoning

Focaal ◽  
2013 ◽  
Vol 2013 (66) ◽  
pp. 25-35 ◽  
Author(s):  
Felix Ringel
Keyword(s):  
Cold War ◽  
Social Relations ◽  
Social Groups ◽  
Temporal Reasoning ◽  
Post Cold War ◽  
Temporal Complexity ◽  
The Past ◽  
The Future ◽  
Temporal Flexibility ◽  
Shrinking City

Hoyerswerda, Germany's fastest-shrinking city, faces problems with the future that seem initially unrelated to the past and yet excite manifold conflicting accounts of it. The multiple and conflicting temporal references employed by Hoyerswerdians indicate that the temporal regime of postsocialism is accompanied, if not overcome, by the temporal framework of shrinkage. By reintroducing the analytical domain of the future, I show that local temporal knowledge practices are not historically predetermined by a homogenous postsocialist culture or by particular generational experiences. Rather, they exhibit what I call temporal complexity and temporal flexibility-creative uses of a variety of coexisting temporal references. My ethnographic material illustrates how such expressions of different forms of temporal reasoning structure social relations within and between different generations. Corresponding social groups are not simply divided by age, but are united through shared and heavily disputed negotiations of the post-Cold War era's contemporary crisis.

Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer

2015 ◽  
Vol 34 (5) ◽  
pp. 1-11 ◽  
Author(s):  
Guojing Li ◽  
Dongxiao Wang ◽  
Ju Chen ◽  
Jinglong Yao ◽  
Lili Zeng ◽  
...  
Keyword(s):  
Mixed Layer ◽  
Dynamic Characteristics ◽  
Surface Mixed Layer ◽  
Langmuir Circulation ◽  
Shear Turbulence

scholarly journals Neuronal avalanches: Where temporal complexity and criticality meet

2017 ◽  
Vol 40 (11) ◽  
Author(s):  
Mohammad Dehghani-Habibabadi ◽  
Marzieh Zare ◽  
Farhad Shahbazi ◽  
Javad Usefie-Mafahim ◽  
Paolo Grigolini
Keyword(s):  
Temporal Complexity ◽  
Neuronal Avalanches
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