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Theory of constraints

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https://www.readbyqxmd.com/read/28542901/mechanisms-and-implications-of-a-type-iv-functional-response-for-short-term-intake-rate-of-dry-matter-in-large-mammalian-herbivores
#1
J C Mezzalira, O J F Bonnet, P C de F Carvalho, L Fonseca, C Bremm, C C Mezzalira, E A Laca
1.The functional response (i.e. the relationship between consumers' intake rate and resource density) is central in plant-herbivore interactions. Its shape and the biological processes leading to it have significant implications for both foraging theory and ecology of grazing systems. 2.A type IV functional response (i.e. dome-shaped relationship) of short-term intake rate of dry matter (intake while grazing) has rarely been reported for large herbivores and the conditions that can lead to it are poorly understood...
May 19, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28539988/adsorption-study-of-a-water-molecule-on-vacancy-defected-nonpolar-cds-surfaces
#2
S S Gupta, M A van Huis
A detailed understanding of the water-semiconductor interface is of major importance for elucidating the molecular interactions at the photocatalyst's surface. Here, we studied the effect of vacancy defects on the adsorption of a water molecule on the (101̅0) and (112̅0) CdS surfaces, using spin-polarized density functional theory. We observed that the local spin polarization did not persist for most of the cationic vacancies on the surfaces, unlike in bulk, owing to surface reconstructions caused by displaced S atoms...
May 11, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28537261/thermoelectric-quantum-oscillations-in-zrsis
#3
Marcin Matusiak, J R Cooper, Dariusz Kaczorowski
Topological semimetals are systems in which conduction and valence bands cross each other and the crossings are protected by topological constraints. These materials provide intriguing tests for fundamental theories, while their unique physical properties promise a wide range of possible applications in low-power spintronics, optoelectronics, quantum computing and green energy harvesting. Here we report our study of the thermoelectric power of single-crystalline ZrSiS that is believed to be a topological nodal-line semimetal...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28533413/confined-catalysis-under-two-dimensional-materials
#4
Haobo Li, Jianping Xiao, Qiang Fu, Xinhe Bao
Confined microenvironments formed in heterogeneous catalysts have recently been recognized as equally important as catalytically active sites. Understanding the fundamentals of confined catalysis has become an important topic in heterogeneous catalysis. Well-defined 2D space between a catalyst surface and a 2D material overlayer provides an ideal microenvironment to explore the confined catalysis experimentally and theoretically. Using density functional theory calculations, we reveal that adsorption of atoms and molecules on a Pt(111) surface always has been weakened under monolayer graphene, which is attributed to the geometric constraint and confinement field in the 2D space between the graphene overlayer and the Pt(111) surface...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28532500/extending-access-to-essential-services-against-constraints-the-three-tier-health-service-delivery-system-in-rural-china-1949-1980
#5
Xing Lin Feng, Melisa Martinez-Alvarez, Jun Zhong, Jin Xu, Beibei Yuan, Qingyue Meng, Dina Balabanova
BACKGROUND: China has made remarkable progress in scaling up essential services during the last six decades, making health care increasingly available in rural areas. This was partly achieved through the building of a three-tier health system in the 1950s, established as a linked network with health service facilities at county, township and village level, to extend services to the whole population. METHODS: We developed a Theory of Change to chart the policy context, contents and mechanisms that may have facilitated the establishment of the three-tier health service delivery system in rural China...
May 23, 2017: International Journal for Equity in Health
https://www.readbyqxmd.com/read/28529399/modeling-high-school-timetabling-with-bitvectors
#6
Emir Demirović, Nysret Musliu
High school timetabling (HSTT) is a well known and wide spread problem. The problem consists of coordinating resources (e.g. teachers, rooms), times, and events (e.g. lectures) with respect to various constraints. Unfortunately, HSTT is hard to solve and just finding a feasible solution for simple variants of HSTT has been proven to be NP-complete. We propose a new modeling approach for HSTT using bitvectors in which constraint costs of the general HSTT can be calculated using bit operations. This model allows efficient computation of constraint costs making it useful when implementing HSTT algorithms...
2017: Annals of Operations Research
https://www.readbyqxmd.com/read/28527449/correlated-matrix-fluctuation-mediated-activated-transport-of-dilute-penetrants-in-glass-forming-liquids-and-suspensions
#7
Rui Zhang, Kenneth S Schweizer
We formulate a microscopic, force-level statistical mechanical theory for the activated diffusion of dilute penetrants in dense liquids, colloidal suspensions, and glasses. The approach explicitly and self-consistently accounts for coupling between penetrant hopping and matrix dynamic displacements that actively facilitate the hopping event. The key new ideas involve two mechanistically (at a stochastic trajectory level) coupled dynamic free energy functions for the matrix and spherical penetrant particles...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28518057/on-the-mechanistic-nature-of-epistasis-in-a-canonical-cis-regulatory-element
#8
Mato Lagator, Tiago Paixao, Nick Barton, Jonathan P Bollback, Călin C Guet
Understanding the relation between genotype and phenotype remains a major challenge. The difficulty of predicting individual mutation effects, and particularly the interactions between them, has prevented the development of a comprehensive theory that links genotypic changes to their phenotypic effects. We show that a general thermodynamic framework for gene regulation, based on a biophysical understanding of protein-DNA binding, accurately predicts the sign of epistasis in a canonical cis-regulatory element consisting of overlapping RNA polymerase and repressor binding sites...
May 18, 2017: ELife
https://www.readbyqxmd.com/read/28514948/demystification-of-animal-symmetry-symmetry-is-a-response-to-mechanical-forces
#9
Gábor Holló
ᅟ: Symmetry is an eye-catching feature of animal body plans, yet its causes are not well enough understood. The evolution of animal form is mainly due to changes in gene regulatory networks (GRNs). Based on theoretical considerations regarding fundamental GRN properties, it has recently been proposed that the animal genome, on large time scales, should be regarded as a system which can construct both the main symmetries - radial and bilateral - simultaneously; and that the expression of any of these depends on functional constraints...
May 17, 2017: Biology Direct
https://www.readbyqxmd.com/read/28511653/processes-and-challenges-of-community-mobilisation-for-latrine-promotion-under-nirmal-bharat-abhiyan-in-rural-odisha-india
#10
Parimita Routray, Belen Torondel, Marion W Jenkins, Thomas Clasen, Wolf-Peter Schmidt
BACKGROUND: Despite efforts to eradicate it, open defecation remains widely practiced in India, especially in rural areas. Between 2013 and 2014, 50 villages in one district of Odisha, India, received a sanitation programme under the Nirmal Bharat Abhiyan (NBA - "Clean India Campaign"), the successor of India's Total Sanitation Campaign. This paper documents the strategies and processes of NBA community mobilisation for latrine promotion in these villages and assesses the strengths and limitations of the mobilisation activities...
May 16, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28510261/constraints-on-trait-combinations-explain-climatic-drivers-of-biodiversity-the-importance-of-trait-covariance-in-community-assembly
#11
John M Dwyer, Daniel C Laughlin
Trade-offs maintain diversity and structure communities along environmental gradients. Theory indicates that if covariance among functional traits sets a limit on the number of viable trait combinations in a given environment, then communities with strong multidimensional trait constraints should exhibit low species diversity. We tested this prediction in winter annual plant assemblages along an aridity gradient using multilevel structural equation modelling. Univariate and multivariate functional diversity measures were poorly explained by aridity, and were surprisingly poor predictors of community richness...
May 16, 2017: Ecology Letters
https://www.readbyqxmd.com/read/28502384/sports-science-needs-more-interdisciplinary-constraints-led-research-programmes-the-case-of-water-safety-in-new-zealand
#12
C Button, J L Croft
In the lead article of this special issue, Paul Glazier proposes that Newell's constraints model has the potential to contribute to a grand unified theory of sports performance in that it can help to integrate the disciplinary silos that have typically operated in isolation in sports and exercise science. With a few caveats discussed in this commentary, we agree with Glazier's proposal. However, his ideas suggest that there is a need to demonstrate explicitly how such an integration might occur within applied scientific research...
May 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28489374/theoretical-study-of-the-pair-correlated-f-chd3-v-0-%C3%AE-1-1-reaction-effect-of-ch-stretching-vibrational-excitation
#13
Joaquin Espinosa-Garcia, Laurent Bonnet, Jose Carlos Corchado
The F + CHD3(v) reaction is a benchmark system in polyatomic reactions. Theoretical/experimental comparisons have been reported in recent years which present some controversies, specifically the role of the reactant CH stretching vibrational excitation, CHD3(v1=1), on the reactivity of both isotope channels, DF(v) + CHD2(v´) and HF(v) + CD3(v´). However, in many cases these comparisons are not made on an equal footing. Previous theoretical studies were concerned with overall reactivity of each isotope channel, while fine velocity map imaging experiments provided results in a product pair-correlated manner...
May 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28484640/the-dispersal-of-planet-forming-discs-theory-confronts-observations
#14
REVIEW
Barbara Ercolano, Ilaria Pascucci
Discs of gas and dust around million-year-old stars are a by-product of the star formation process and provide the raw material to form planets. Hence, their evolution and dispersal directly impact what type of planets can form and affect the final architecture of planetary systems. Here, we review empirical constraints on disc evolution and dispersal with special emphasis on transition discs, a subset of discs that appear to be caught in the act of clearing out planet-forming material. Along with observations, we summarize theoretical models that build our physical understanding of how discs evolve and disperse and discuss their significance in the context of the formation and evolution of planetary systems...
April 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28484376/information-and-the-origin-of-qualia
#15
Roger Orpwood
This article argues that qualia are a likely outcome of the processing of information in local cortical networks. It uses an information-based approach and makes a distinction between information structures (the physical embodiment of information in the brain, primarily patterns of action potentials), and information messages (the meaning of those structures to the brain, and the basis of qualia). It develops formal relationships between these two kinds of information, showing how information structures can represent messages, and how information messages can be identified from structures...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28480017/the-evolution-of-different-maternal-investment-strategies-in-two-closely-related-desert-vertebrates
#16
Joshua R Ennen, Jeffrey E Lovich, Roy C Averill-Murray, Charles B Yackulic, Mickey Agha, Caleb Loughran, Laura Tennant, Barry Sinervo
We compared egg size phenotypes and tested several predictions from the optimal egg size (OES) and bet-hedging theories in two North American desert-dwelling sister tortoise taxa, Gopherus agassizii and G. morafkai, that inhabit different climate spaces: relatively unpredictable and more predictable climate spaces, respectively. Observed patterns in both species differed from the predictions of OES in several ways. Mean egg size increased with maternal body size in both species. Mean egg size was inversely related to clutch order in G...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28476865/accounting-for-sampling-error-in-genetic-eigenvalues-using-random-matrix-theory
#17
Jacqueline L Sztepanacz, Mark W Blows
The distribution of genetic variance in multivariate phenotypes is characterized by the empirical spectral distribution of the eigenvalues of the genetic covariance matrix. Empirical estimates of genetic eigenvalues from random effects linear models are known to be over-dispersed by sampling error, where large eigenvalues are biased upwards, and small eigenvalues are biased downwards. The overdispersion of the leading eigenvalues of sample covariance matrices have been demonstrated to conform to the Tracy-Widom (TW) distribution...
May 5, 2017: Genetics
https://www.readbyqxmd.com/read/28472052/antioxidant-allocation-modulates-sperm-quality-across-changing-social-environments
#18
Alfonso Rojas Mora, Magali Meniri, Ophélie Gning, Gaëtan Glauser, Armelle Vallat, Fabrice Helfenstein
In promiscuous species, male reproductive success depends on their ability to mate with fertile females and on the fertilizing ability of their sperm. In such species, theory predicts that, owing to a trade-off between pre- and post-copulatory reproductive traits, males with lesser access to females should increase resource investment into those sperm traits that enhance fertilization success-usually referred to as ejaculate quality. This prediction has been validated in several taxa, yet studies on the physiological mechanisms modulating ejaculate quality are lacking...
2017: PloS One
https://www.readbyqxmd.com/read/28467888/auditory-object-perception-a-neurobiological-model-and-prospective-review
#19
Julie A Brefczynski-Lewis, James W Lewis
Interaction with the world is a multisensory experience, but most of what is known about the neural correlates of perception comes from studying vision. Auditory inputs enter cortex with its own set of unique qualities, and leads to use in oral communication, speech, music, and the understanding of emotional and intentional states of others, all of which are central to the human experience. To better understand how the auditory system develops, recovers after injury, and how it may have transitioned in its functions over the course of hominin evolution, advances are needed in models of how the human brain is organized to process real-world natural sounds and "auditory objects"...
April 30, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28467847/spin-projected-matrix-product-states-versatile-tool-for-strongly-correlated-systems
#20
Zhendong Li, Garnet Kin-Lic Chan
We present a new wave function ansatz that combines the strengths of spin projection with the language of matrix product states (MPS) and matrix product operators (MPO) as used in the density matrix renormalization group (DMRG). Specifically, spin-projected matrix product states (SP-MPS) are constructed as [Formula: see text], where [Formula: see text] is the spin projector for total spin S and |ΨMPS((N,M))⟩ is an MPS wave function with a given particle number N and spin projection M. This new ansatz possesses several attractive features: (1) It provides a much simpler route to achieve spin adaptation (i...
May 16, 2017: Journal of Chemical Theory and Computation
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