bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finite‐time fault tolerant control for stochastic parameter systems with intermittent fault under stochastic communication protocol
Authors: Ju Yamei , Wei Guoliang , Ding Derui , Liu Shuai 
Published: July 2020

SummaryIn this article, the finite‐time fault tolerant control problem is investigated for a class of discrete‐time stochastic parameter systems subject to censored measurements. For the sake of relieving the communication burden, a stochastic communication protocol governed by a Markov chain is employed to determine which actuator has the access to the network at each transmission instant. Moreover, an improved performance index dependent on the predetermined censored threshold is constructed to evaluate the disturbance rejection level of the fault tolerant controller in the simultaneous presence of both external disturbances and censoring effects. The main aim of the addressed problem is to design a fault tolerant controller such that the closed‐loop system satisfies both the stochastically finite‐time boundedness and H∞ performance requirements. In light of the Lyapunov theory combined with matrix inequalities, some sufficient conditions are derived skillfully, and the desired controller gains are calculated by solving a set of linear matrix inequalities. Finally, two simulation examples are utilized to demonstrate the effectiveness of the developed controller design method.
Conservatism reduction for linear parameter‐varying control design facing inexact scheduling parameters illustrated on flight tests
Authors: Sato Masayuki , Peaucelle Dimitri 
Published: July 2020

SummaryThis article addresses the design problem of linear parameter‐varying (LPV) output feedback controllers that depend on inexact scheduling parameters for LPV systems. This problem has already been tackled and several methods have been proposed by overbounding the discrepancies between the actual scheduling parameters and the provided ones in the derivation of controller design condition. However, all methods in literature have conservatism in the overbounding, which is the main issue addressed in this article. We therefore propose a new overbounding for the discrepancies with the reverse use of Elimination lemma, which introduces no conservatism in theory. The new method is formulated in terms of bilinear matrix inequality, which is not tractable compared with linear matrix inequality, thus a practical design procedure composed of line search and iterative algorithm is shown. The effectiveness of our method is illustrated by an application to flight controller design for the lateral‐directional motions of a research airplane MuPAL‐α and the consequently conducted flight tests.
Geomorphological response to system‐scale river rehabilitation II: Main‐stem channel adjustments following reconnection of an ephemeral tributary
Authors: Marteau Baptiste , Gibbins Chris , Vericat Damià , Batalla Ramon J. 
Published: July 2020

AbstractThis paper describes changes in bed morpho‐dynamics and topography in the River Ehen, a regulated river in NW England (i.e., temperate climate) following a rehabilitation project that reconnected a formerly diverted headwater sub‐catchment back to its main‐stem. Sediment grain‐size distributions in the Ehen changed subtly and in rather complex ways following the reconnection. Changes were most evident in the riffle morphological unit, where gravel‐sized material accumulated in the first 2 years after the reconnection. All morphological units initially experienced an addition of fine sediment (size <8 mm) but by the end of the study the proportion of fine material in the bed matrix had returned to pre‐reconnection levels. Topographic changes were evident in some units, with net aggradation in the riffle and scour in the plane bed; there was no detectable change in the pool. Albeit limited, there was evidence of an increase in bed mobility, with field observations indicating that the new sediment is moving over the top of the largely static existing pavement, rather than interacting with it. Despite numerous uncertainties related mainly to the ephemeral nature of the tributary and, consequently, how much sediment it would deliver, evidence suggests that the main project objective is being met: there is a renewed supply of sediment now being delivered to the main‐stem Ehen at times and in quantities that are controlled by natural processes. Nevertheless, the river is still best considered to be in an adjustment phase, so assessment of its long term response to the reconnection requires continued monitoring.
Geomorphological response to system‐scale river rehabilitation I: Sediment supply from a reconnected tributary
Authors: Marteau Baptiste , Gibbins Chris , Vericat Damià , Batalla Ramon J. 
Published: July 2020

AbstractThis paper is the first of a pair that report the findings of a river rehabilitation project centred on the reconnection of a formerly diverted headwater tributary (Ben Gill) to its main‐stem river (the River Ehen). The present paper describes the geomorphic evolution of the tributary in the 2 years following its reconnection, with a particular focus on assessing the volumes of sediment now being supplied to the main‐stem Ehen. Structure‐from‐Motion photogrammetry was used to produce Digital Elevation Models (DEMs) of the newly connected tributary, with successive DEMs compared to assess topographic changes in the channel and quantify volumes of material exported. 3D errors in the DEMs were small relative to the scour and fill observed in the channel (error 0.016–0.056 m compared to up to 1.7 m vertical change between consecutive surveys). Erosion was the dominant process in the tributary channel, though this varied spatially and temporally. Over the 2‐year period, an estimated minimum of 384 m3 of coarse sediment was exported from Ben Gill and delivered to the confluence zone, where a new bar feature developed as a result. This estimate is twice as high as earlier ones. Analysis of the growth of this bar suggested that much of the material supplied by Ben Gill remains here temporarily, with onward conveyance constrained by the competence of the regulated main‐stem. The work shows that, thanks to the reconnection, this small (0.55 km2) ephemeral tributary (flowing for only around 20% of the time) has become a key source of sediment for the main‐stem Ehen. The second in the pair of papers focuses on the geomorphic responses of the main‐stem to this renewed supply of sediment.
Theory and experiments of a low sampling frequency broadband digital predistortion with cyclostationarity
Authors: Lan Rong , Hu Xin , Wang Gang , Luo Jirun , Yang Yi , Song Jingyan 
Published: July 2020

SummaryTo reduce the sampling rate from analog to digital converter for the feedback loop of digital predistortion (DPD) in a microwave power amplifier (MPA), a model was proposed and used to obtain the formulae for the cyclostationarity of the digital modulation signal, which shows that the nonlinear parameter of the MPA model is only determined by the correlation matrix of the signal and can be estimated with the under‐sampled output signal. The output signal of the MPA, similar to a high sampling rate, can be recovered by combining the nonlinear parameter with the input signal. Then the DPD of the MPA is implemented through indirect learning architecture to realize its linearization. A Ka‐band traveling wave tube amplifier is used to the circuit for performing a low sampling rate DPD process to validate the rationality of the proposed model and formulae.
Efficient interaction selection for clustered data via stagewise generalized estimating equations
Authors: Vaughan Gregory , Aseltine Robert , Chen Kun , Yan Jun 
Published: July 2020

AbstractModel selection in the presence of interaction terms is challenging as the final model must maintain a hierarchy between main effects and interaction terms. This work presents two stagewise estimation approaches to appropriately select models with interaction terms that can utilize generalized estimating equations to model clustered data. The first proposed technique is a hierarchical lasso stagewise estimating equations approach, which is shown to directly correspond to the hierarchical lasso penalized regression. The second is a stagewise active set approach, which enforces the variable hierarchy by conforming the selection to a properly growing active set in each stagewise estimation step. The effectiveness in interaction selection and the superior computational efficiency of the proposed techniques are assessed in simulation studies. The new methods are applied to a study of hospitalization rates attributed to suicide attempts among 15 to 19 year old at the school district level in Connecticut.
Cationic Covalent‐Organic Framework as Efficient Redox Motor for High‐Performance Lithium–Sulfur Batteries
Authors: Liu Xiao‐Fei , Chen Hong , Wang Rui , Zang Shuang‐Quan , Mak Thomas C. W. 
Published: July 2020

AbstractThe shuttle effect of soluble lithium polysulfides (LiPSs) leads to the rapid decay of sulfur cathode, severely hindering the practical applications of lithium‐sulfur (Li‐S) batteries. To this point, a covalent‐organic framework (COF) with proper cationic sites, which can be utilized as the cathode host of high‐performance Li–S batteries, is reported. The chemical sulfur anchoring within micropores effectively suppresses the dissolution of LiPSs into the electrolyte. During the discharge step, the cationic sites can accept electrons from anode and deliver them to polysulfides to facilitate the polysulfides' disintegration. Meanwhile, the cationic sites can receive electrons from polysulfides and then send them to the anode during the charge process, which promotes the polysulfides oxidation. Thus, both experiments and computational modeling show that the cationic COF can effectively inhibit the shuttle effect of LiPSs and improve the batteries' performances. Compared with electrically neutral COFs, the cationic COF‐based batteries show much better cycling stability even at high current density, for instance, a high specific capacity of 468 mA h g−1 is retained after 300 cycles at a current density of 4.0 C.
Costs of repair of wind turbine blades: Influence of technology aspects
Authors: Mishnaevsky Leon , Thomsen Kenneth 
Published: July 2020

AbstractThe influence of repair technology of wind turbine blades on the levelized costs of energy (LCOE) is analyzed. The contribution of minor and major failure to the operational expenditures (OPEX) of wind turbines is estimated. It is demonstrated that the minor failure, mainly, surface erosion, is the largest contributor to the unplanned repair, 12 times higher than structural failure. The shortening of material curing procedure can lead to the significant reduction of repair costs, and LCOE, and expand the so‐called “repair window.” The analysis of the role of defects and voids in adhesives on the post‐repair lifetime of wind turbine blades and energy costs is carried out. Using the continuum damage mechanics approach, it is demonstrated that the voids in adhesives drastically reduce the post‐repair lifetime of wind turbine blades.
Lights up on organelles: Optogenetic tools to control subcellular structure and organization
Authors: Kichuk Therese C. , Carrasco‐López César , Avalos José L. 
Published: July 2020

AbstractSince the neurobiological inception of optogenetics, light‐controlled molecular perturbations have been applied in many scientific disciplines to both manipulate and observe cellular function. Proteins exhibiting light‐sensitive conformational changes provide researchers with avenues for spatiotemporal control over the cellular environment and serve as valuable alternatives to chemically inducible systems. Optogenetic approaches have been developed to target proteins to specific subcellular compartments, allowing for the manipulation of nuclear translocation and plasma membrane morphology. Additionally, these tools have been harnessed for molecular interrogation of organelle function, location, and dynamics. Optogenetic approaches offer novel ways to answer fundamental biological questions and to improve the efficiency of bioengineered cell factories by controlling the assembly of synthetic organelles. This review first provides a summary of available optogenetic systems with an emphasis on their organelle‐specific utility. It then explores the strategies employed for organelle targeting and concludes by discussing our perspective on the future of optogenetics to control subcellular structure and organization.This article is categorized under:
Metabolic Diseases > Molecular and Cellular Physiology
A free field perspective of λ-deformed coset CFT’s
Authors: Georgiou George , Sfetsos Konstantinos , Siampos Konstantinos 
Published: July 2020

Abstract
We continue our study of λ-deformed σ-models by setting up a $$ \frac{1}{k} $$

1
k

perturbative expansion around the free field point for cosets, in particular for the λ-deformed SU(2)/U(1) coset CFT. We construct an interacting field theory in which all deformation effects are manifestly encoded in the interaction vertices. Using this we reproduce the known β-function and the anomalous dimension of the composite operator perturbing away from the conformal point. We introduce the λ-dressed parafermions which have an essential Wilson- like phase in their expressions. Subsequently, we compute their anomalous dimension, as well as their four-point functions, as exact functions of the deformation and to leading order in the k expansion. Correlation functions with an odd number of these parafermions vanish as in the conformal case.
Spectral fluctuations in the Sachdev-Ye-Kitaev model
Authors: Jia Yiyang , Verbaarschot Jacobus J. M. 
Published: July 2020

Abstract
We present a detailed quantitative analysis of spectral correlations in the Sachdev-Ye-Kitaev (SYK) model. We find that the deviations from universal Random Matrix Theory (RMT) behavior are due to a small number of long-wavelength fluctuations (of the order of the number of Majorana fermions N) from one realization of the ensemble to the next one. These modes can be parameterized effectively in terms of Q-Hermite orthogonal polynomials, the main contribution being due to scale fluctuations for which we give a simple analytical estimate. Our numerical results for N = 32 show that only the lowest eight polynomials are needed to eliminate the nonuniversal part of the spectral fluctuations. The covariance matrix of the coefficients of this expansion can be obtained analytically from low-order double-trace moments. We evaluate the covariance matrix of the first six moments and find that it agrees with the numerics. We also analyze the spectral correlations in terms of a nonlinear σ-model, which is derived through a Fierz transformation, and evaluate the one and two-point spectral correlation functions to two-loop order. The wide correlator is given by the sum of the universal RMT result and corrections whose lowest-order term corresponds to scale fluctuations. However, the loop expansion of the σ-model results in an ill-behaved expansion of the resolvent, and it gives universal RMT fluctuations not only for q = 4 or higher even q-body interactions, but also for the q = 2 SYK model albeit with a much smaller Thouless energy while the correct result in this case should have been Poisson statistics. In our numerical studies we analyze the number variance and spectral form factor for N = 32 and q = 4. We show that the quadratic deviation of the number variance for large energies appears as a peak for small times in the spectral form factor. After eliminating the long-wavelength fluctuations, we find quantitative agreement with RMT up to an exponentially large number of level spacings for the number variance or exponentially short times in the case of the spectral form factor.
Pressure-driven flow in a thin pipe with rough boundary
Authors: Miroshnikova Elena 
Published: July 2020

AbstractStationary incompressible Newtonian fluid flow governed by external force and external pressure is considered in a thin rough pipe. The transversal size of the pipe is assumed to be of the order $$\varepsilon $$
ε
, i.e., cross-sectional area is about $$\varepsilon ^{2}$$

ε
2

, and the wavelength in longitudinal direction is modeled by a small parameter $$\mu $$
μ
. Under general assumption $$\varepsilon ,\mu \rightarrow 0$$

ε
,
μ
→
0

, the Poiseuille law is obtained. Depending on $$\varepsilon ,\mu $$

ε
,
μ

-relation ($$\varepsilon \ll \mu $$

ε
≪
μ

, $$\varepsilon /\mu \sim \mathrm {constant}$$

ε
/
μ
∼
constant

, $$\varepsilon \gg \mu $$

ε
≫
μ

), different cell problems describing the local behavior of the fluid are deduced and analyzed. Error estimates are presented.
Heritable epigenetic diversity for conservation and utilization of epigenetic germplasm resources of clonal East African Highland banana (EAHB) accessions
Authors: Kitavi M. , Cashell R. , Ferguson M. , Lorenzen J. , Nyine M. , McKeown P. C. , Spillane C. 
Published: July 2020

Abstract
Key message
Genetically identical East African Highland banana (EAHB) clones are epigenetically diverse with heritable epialleles that can contribute to morphological diversity.

Abstract
Heritable epigenetic variation can contribute to agronomic traits in crops and should be considered in germplasm conservation. Despite the genetic uniformity arising from a genetic bottleneck of one ancestral clone, followed by subsequent vegetative propagation, East African Highland bananas (EAHBs) display significant phenotypic diversity potentially arising from somatic mutations, heritable epialleles and/or genotype-by-environment interactions. Here, we use DNA methylation profiling across EAHB accessions representing most of the primary EAHB genepool to demonstrate that the genetically uniform EAHB genepool harbours significant epigenetic diversity. By analysing 724 polymorphic DNA methylation sites by methylation-sensitive AFLP across 90 EAHB cultivars, we could differentiate the EAHB varieties according to their regions (Kenya and Uganda). In contrast, there was minimal association of DNA methylation variation with the five morphological groups that are used to classify EAHBs. We further analysed DNA methylation patterns in parent–offspring cohort, which were maintained in offspring generated by sexual (seed) and asexual (vegetative) propagation, with higher levels of altered DNA methylation observed in vegetatively generated offspring. Our results indicate that the phenotypic diversity of near-isogenic EAHBs is mirrored by considerable DNA methylation variation, which is transmitted between generations by both vegetative reproduction and seed reproduction. Genetically uniform vegetatively propagated crops such as EAHBs harbour considerable heritable epigenetic variation, where heritable epialleles could arise in offspring and contribute to functional traits. This study provides a basis for developing strategies for conservation of epigenetic resources and for integration of epimarkers into crop breeding programmes.
Digital technology and changing roles: a management accountant’s dream or nightmare?
Authors: Andreassen Roy-Ivar 
Published: July 2020

AbstractRecent developments in digital technology have revitalized interest in the relationship between technology and management accounting. Yet, few empirical in-depth studies have assessed how digital technologies influence the roles of management accountants. This paper builds on the concept of jurisdiction to illuminate the relationship between management accountants, expert knowledge and digital technology. The study identifies and describes competition over jurisdiction between management accountants and other groups of employees. The study describes a shift for divisional management accountants towards narrower roles in their tasks and expectations, while business-oriented roles at group level are found to entail expanding tasks and expectations. In doing so, management accountants are divided into two divergent categories facing different expectations: divisional and group level management accountants. Through a case study in the technology-oriented finance sector, the paper contributes to the debate on the roles of management accountants in a number of ways. First, it describes how digital technology can contribute to narrower and more specialized roles. Second, it describes how digital technology can contribute to competition between professions. Third, it elucidates how digital technology contributes to changes in the behaviour of decision makers, and in their expectations toward, and the involvement of, management accountants. Fourth, it details how the changes contributed by digital technology in the roles of management accountants can act as mediators in the identity-work of management accountants. Finally, it empirically describes the relationships between digital technology and management accountants’ roles.
FvatfA regulates growth, stress tolerance as well as mycotoxin and pigment productions in Fusarium verticillioides
Authors: Szabó Zsuzsa , Pákozdi Klaudia , Murvai Katalin , Pusztahelyi Tünde , Kecskeméti Ádám , Gáspár Attila , Logrieco Antonio F. , Emri Tamás , Ádám Attila L. , Leiter Éva , Hornok László , Pócsi István 
Published: July 2020

AbstractFvatfA from the maize pathogen Fusarium verticillioides putatively encodes the Aspergillus nidulans AtfA and Schizasaccharomyces pombe Atf1 orthologous bZIP-type transcription factor, FvAtfA. In this study, a ΔFvatfA deletion mutant was constructed and then genetically complemented with the fully functional FvatfA gene. Comparing phenotypic features of the wild-type parental, the deletion mutant and the restored strains shed light on the versatile regulatory functions played by FvAtfA in (i) the maintenance of vegetative growth on Czapek-Dox and Potato Dextrose agars and invasive growth on unwounded tomato fruits, (ii) the preservation of conidiospore yield and size, (iii) the orchestration of oxidative (H2O2, menadione sodium bisulphite) and cell wall integrity (Congo Red) stress defences and (iv) the regulation of mycotoxin (fumonisins) and pigment (bikaverin, carotenoid) productions. Expression of selected biosynthetic genes both in the fumonisin (fum1, fum8) and the carotenoid (carRA, carB) pathways were down-regulated in the ΔFvatfA strain resulting in defected fumonisin production and considerably decreased carotenoid yields. The expression of bik1, encoding the polyketide synthase needed in bikaverin biosynthesis, was not up-regulated by the deletion of FvatfA meanwhile the ΔFvatfA strain produced approximately ten times more bikaverin than the wild-type or the genetically complemented strains. The abolishment of fumonisin production of the ΔFvatfA strain may lead to the development of new-type, biology-based mycotoxin control strategies. The novel information gained on the regulation of pigment production by this fungus can be interesting for experts working on new, Fusarium-based biomass and pigment production technologies.

Key points• FvatfA regulates vegetative and invasive growths of F. verticillioides.• FvatfA also orchestrates oxidative and cell wall integrity stress defenses.• The ΔFvatfA mutant was deficient in fumonisin production.• FvatfA deletion resulted in decreased carotenoid and increased bikaverin yields.