20,104 results match your criteria quadratic


The relation between young adults' trust beliefs in others and interpersonal hostility.

Aggress Behav 2021 Jun 10. Epub 2021 Jun 10.

School of Psychology, Keele Uniiversity, Keele, United Kingdom.

The research examined whether, and if so how, young adults' trust beliefs in others were associated with interpersonal hostility. The participants in Study 1 were 139 young adults from the UK (76 women; Mage = 20.8). Read More

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Decline in physical activity in the weeks preceding sustained ventricular arrhythmia in women.

Heart Rhythm O2 2020 Oct 25;1(4):283-287. Epub 2020 Jun 25.

Department of Medicine, Cooper Medical School of Rowan University, Camden, New Jersey.

Background: Heightened risk of cardiac arrest following physical exertion has been reported. Among patients with an implantable defibrillator, an appropriate shock for sustained ventricular arrhythmia was preceded by a retrospective self-report of engaging in mild-to-moderate physical activity. Previous studies evaluating the relationship between activity and sudden cardiac arrest lacked an objective measure of physical activity and women were often underrepresented. Read More

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October 2020

Deciphering the constrained total energy expenditure model in humans by associating accelerometer-measured physical activity from wrist and hip.

Sci Rep 2021 Jun 10;11(1):12302. Epub 2021 Jun 10.

PROFITH "PROmoting FITness and Health Through Physical Activity" Research Group, Sport and Health University Research Institute (iMUDS), Department of Physical and Sports Education, Faculty of Sport Sciences, University of Granada, Crta Alfcar s/n, 18011, Granada, Spain.

The constrained total energy expenditure (TEE) model posits that progressive increases in physical activity (PA) lead to increases in TEE; but after certain PA threshold, TEE plateaus. Then, a compensatory reduction in the expenditure of non-essential activities constrains the TEE. We hypothesized that high PA levels as locomotion associate with a compensatory attenuation in arm movements. Read More

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Influence of the energy and digestible lysine contents of the diet on performance and egg quality traits of brown-egg laying hens from 19 to 59 weeks of age.

Poult Sci 2021 Apr 21;100(7):101211. Epub 2021 Apr 21.

Departamento de Producción Agraria, Universidad Politécnica de Madrid, 28040 Madrid, Spain. Electronic address:

The influence of nutrient density and standardized ileal digestible lys (DLys) content of the diet on egg production and egg quality traits, was studied in brown-egg laying hens from 19 to 59 wk of age. The experimental design was completely randomized with eight treatments arranged as a 2×4 factorial with two AMEn concentrations (2,680 and 2,780 kcal/kg) and four levels of DLys (0.68, 0. Read More

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Resistivity Exponents in 3D Dirac Semimetals From Electron-Electron Interaction.

Phys Rev Lett 2021 May;126(20):206601

Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, 97074 Würzburg, Germany.

We study the resistivity of three-dimensional semimetals with linear dispersion in the presence of on-site electron-electron interaction. The well-known quadratic temperature dependence of the resistivity of conventional metals is turned into an unusual T^{6} behavior. An analogous change affects the thermal transport, preserving the linearity in T of the ratio between thermal and electrical conductivities. Read More

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Soil parameters affecting the levels of potentially harmful metals in Thessaly area, Greece: a robust quadratic regression approach of soil pollution prediction.

Environ Sci Pollut Res Int 2021 Jun 9. Epub 2021 Jun 9.

School of Electrical and Computer Engineering (ECE), Technical University of Crete, University Campus, Akrotiri, 73 100, Chania, Crete, Greece.

The behavior and possible contamination risk due to the presence of potentially harmful metals (PHM) were studied based on 2250 soil samples that were collected in a 5-year period (2013-2017) from the plain of Thessaly (prefectures of Karditsa, Trikala, and Larissa). The vertical distribution of metals was also investigated from sample profiles at three depths 0-30, 30-60, and 60-90cm. The soils of the sampling belong to four taxonomy soil orders that are dominant in the studied area (Alfisols, Inceptisols, Endisols, and Vertisols). Read More

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On a Finitely Activated Terminal RNN Approach to Time-Variant Problem Solving.

IEEE Trans Neural Netw Learn Syst 2021 Jun 9;PP. Epub 2021 Jun 9.

This article concerns with terminal recurrent neural network (RNN) models for time-variant computing, featuring finite-valued activation functions (AFs), and finite-time convergence of error variables. Terminal RNNs stand for specific models that admit terminal attractors, and the dynamics of each neuron retains finite-time convergence. The might-existing imperfection in solving time-variant problems, through theoretically examining the asymptotically convergent RNNs, is pointed out for which the finite-time-convergent models are most desirable. Read More

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Maximum Margin Multi-Dimensional Classification.

IEEE Trans Neural Netw Learn Syst 2021 Jun 9;PP. Epub 2021 Jun 9.

Multi-dimensional classification (MDC) assumes heterogeneous class spaces for each example, where class variables from different class spaces characterize semantics of the example along different dimensions. The heterogeneity of class spaces leads to incomparability of the modeling outputs from different class spaces, which is the major difficulty in designing MDC approaches. In this article, we make a first attempt toward adapting maximum margin techniques for MDC problem and a novel approach named M³MDC is proposed. Read More

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Evaluating probabilistic ecological forecasts.

Ecology 2021 Jun 9:e03431. Epub 2021 Jun 9.

Wildlife Ecology and Conservation, University of Florida, USA.

Probabilistic near-term forecasting facilitates evaluation of model predictions against observations and is of pressing need in ecology to inform environmental decision making and effect societal change. Despite this imperative, many ecologists are unfamiliar with the widely used tools for evaluating probabilistic forecasts developed in other fields. We address this gap by reviewing the literature on probabilistic forecast evaluation from diverse fields including climatology, economics, and epidemiology. Read More

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Performance, biochemical and physiological parameters of Dorper × Santa Ines lambs fed with three levels of metabolizable energy.

Trop Anim Health Prod 2021 Jun 9;53(3):353. Epub 2021 Jun 9.

Department of Animal Science, Federal University of Paraná, Palotina Campus, Palotina, PR, Brazil.

This study aimed to evaluate the performance and the blood biochemical and physiological parameters of Dorper × Santa Ines lambs receiving three levels of metabolizable energy (ME). A completely randomized design with three treatments (ME levels) and eight replicates (lambs) was used. Twenty-four non-castrated male lambs of four months of age and 21. Read More

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Trajectories of pain during pregnancy predict symptoms of postpartum depression.

Pain Rep 2021 Jul-Aug;6(2):e933. Epub 2021 Jun 3.

Department of Psychological and Brain Sciences, Texas A&M University, College Station, TX, USA.

Introduction: Postpartum depression imparts a significant and long-lasting burden on maternal and child health. Successful prevention or early detection of postpartum depression will rely on the identification of early risk factors. Pain during pregnancy (before childbirth) is a key potential predictor of postpartum depression risk. Read More

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Floquet scattering of quadratic band-touching semimetals through a time-periodic potential well.

J Phys Condens Matter 2021 Jun 9;33(29). Epub 2021 Jun 9.

Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland.

We consider tunneling of quasiparticles through a rectangular quantum well, subject to periodic driving. The quasiparticles are the itinerant charges in two-dimensional and three-dimensional semimetals having a quadratic bandtouching (QBT) point in the Brillouin zone. To analyze the time-periodic Hamiltonian, we assume a non-adiabatic limit where the Floquet theorem is applicable. Read More

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An efficient alpha seeding method for optimized extreme learning machine-based feature selection algorithm.

Comput Biol Med 2021 May 23;134:104505. Epub 2021 May 23.

College of Information Engineering, Nanjing University of Finance and Economics, Nanjing, 210023, China.

Embedded feature selection algorithms, such as support vector machine based recursive feature elimination (SVM-RFE), have proven to be effective for many real applications. However, due to the model selection problem, SVM-RFE naturally suffers from a heavy computational burden as well as high computational complexity. To solve these issues, this paper proposes using an optimized extreme learning machine (OELM) model instead of SVM. Read More

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A Hybrid Stochastic-Deterministic Minibatch Proximal Gradient Method for Efficient Optimization and Generalization.

IEEE Trans Pattern Anal Mach Intell 2021 Jun 8;PP. Epub 2021 Jun 8.

Despite the success of stochastic variance-reduced gradient (SVRG) algorithms in solving large-scale problems, their stochastic gradient complexity often scales linearly with data size and is expensive for huge data. Accordingly, we propose a hybrid stochastic-deterministic minibatch proximal gradient~(HSDMPG) algorithm for strongly convex problems with linear prediction structure, e.g. Read More

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Histidine dose-response effects on lactational performance and plasma amino acid concentrations in lactating dairy cows: 2. Metabolizable protein-deficient diet.

J Dairy Sci 2021 Jun 4. Epub 2021 Jun 4.

Department of Animal Science, The Pennsylvania State University, University Park 16802. Electronic address:

The objective of this experiment was to determine the effect of increasing digestible His (dHis) levels with a rumen-protected (RP) His product on milk production, milk composition, and plasma AA concentrations in lactating dairy cows fed a metabolizable protein (MP)-deficient diet, according to the National Research Council dairy model from 2001. The companion paper presents results on the effect of increasing dHis dose with a MP-adequate basal diet. Twenty Holstein cows, of which 8 were rumen-cannulated, were used in a replicated 4 × 4 Latin square design experiment with four 28-d periods. Read More

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Histidine dose-response effects on lactational performance and plasma amino acid concentrations in lactating dairy cows: 1. Metabolizable protein-adequate diet.

J Dairy Sci 2021 Jun 4. Epub 2021 Jun 4.

Department of Animal Science, The Pennsylvania State University, University Park 16802. Electronic address:

The objective of this experiment was to determine the effect of increasing digestible His (dHis) doses on milk production, milk composition, and plasma AA concentrations in lactating dairy cows fed diets that meet or exceed their energy and metabolizable protein (MP) requirements. In a companion paper (Räisänen et al., 2021) results are presented on the effect of increasing dHis dose with an MP-deficient basal diet. Read More

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Effects of graded levels of xylo-oligosaccharides on growth performance, serum parameters, intestinal morphology and intestinal barrier function in weaned piglets.

J Anim Sci 2021 Jun 7. Epub 2021 Jun 7.

Precision Livestock and Nutrition Unit, Gembloux Agro-Bio Tech, TERRA Teaching and Research Centre, Liège University, Passage des Déportés 2, 5030 Gembloux, Belgium.

The objective of this study was to investigate the effects of xylo-oligosaccharides (XOS) supplementation on growth performance, serum parameters, small intestinal morphology, intestinal mucosal integrity, and immune function in weaned piglets. A total of 240 weaned piglets with an average body weight (BW) of 8.82 ± 0. Read More

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Improved Stability Criteria for Discrete-Time Delayed Neural Networks via Novel Lyapunov-Krasovskii Functionals.

IEEE Trans Cybern 2021 Jun 7;PP. Epub 2021 Jun 7.

This article investigates the stability problem for discrete-time neural networks with a time-varying delay by focusing on developing new Lyapunov-Krasovskii (L-K) functionals. A novel L-K functional is deliberately tailored from two aspects: 1) the quadratic term and 2) the single-summation term. When the variation of the discrete-time delay is further considered, the constant matrix involved in the quadratic term is extended to be a delay-dependent one. Read More

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Elastic Net Nonparallel Hyperplane Support Vector Machine and Its Geometrical Rationality.

Authors:
Kai Qi Hu Yang

IEEE Trans Neural Netw Learn Syst 2021 Jun 7;PP. Epub 2021 Jun 7.

Twin support vector machine (TWSVM), which constructs two nonparallel classifying hyperplanes, is widely applied to various fields. However, TWSVM solves two quadratic programming problems (QPPs) separately such that the final classifiers lack consistency and enough prediction accuracy. Moreover, by reason of only considering the 1-norm penalty for slack variables, TWSVM is not well defined in the geometrical view. Read More

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Ensemble Support Vector Recurrent Neural Network for Brain Signal Detection.

IEEE Trans Neural Netw Learn Syst 2021 Jun 7;PP. Epub 2021 Jun 7.

The brain-computer interface (BCI) P300 speller analyzes the P300 signals from the brain to achieve direct communication between humans and machines, which can assist patients with severe disabilities to control external machines or robots to complete expected tasks. Therefore, the classification method of P300 signals plays an important role in the development of BCI systems and technologies. In this article, a novel ensemble support vector recurrent neural network (E-SVRNN) framework is proposed and developed to acquire more accurate and efficient electroencephalogram (EEG) signal classification results. Read More

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Venlafaxine and O-desmethylvenlafaxine serum levels are positively associated with antidepressant response in elder depressed out-patients.

World J Biol Psychiatry 2021 Jun 7:1-14. Epub 2021 Jun 7.

Department of Psychiatry, Bolzano, Italy.

Background: Therapeutic Drug Monitoring (TDM) represents one of the most promising tools in clinical practice to optimize antidepressant treatment. Nevertheless, little is still known regarding the relationship between clinical efficacy and serum concentration of venlafaxine (VEN). The aim of our study was to investigate the association between serum concentration of venlafaxine + O-desmethylvenlafaxine (SCVO) and antidepressant response (AR). Read More

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Importance of convective boundary layer flows with inhomogeneous material properties under linear and quadratic Boussinesq approximations around a horizontal cylinder.

Heliyon 2021 May 25;7(5):e07074. Epub 2021 May 25.

Department of Mathematics, Obafemi Awolowo University, Ile-Ife, 220005, Nigeria.

This study investigates boundary layer flows with inhomogeneous material properties driven by natural convection using linear and quadratic Boussinesq approximations around a horizontal cylinder. The cylinder's surface was kept at a uniform temperature. The governing equations for the setup were formulated from the principles of mass continuity, momentum and energy under realistic assumptions. Read More

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Inversion of Winter Wheat Growth Parameters and Yield Under Different Water Treatments Based on UAV Multispectral Remote Sensing.

Front Plant Sci 2021 20;12:609876. Epub 2021 May 20.

College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing, China.

In recent years, the unmanned aerial vehicle (UAV) remote sensing system has been rapidly developed and applied in accurate estimation of crop parameters and yield at farm scale. To develop the major contribution of UAV multispectral images in predicting winter wheat leaf area index (LAI), chlorophyll content (called soil and plant analyzer development [SPAD]), and yield under different water treatments (low water level, medium water level, and high water level), vegetation indices (VIs) originating from UAV multispectral images were used during key winter wheat growth stages. The estimation performances of the models (linear regression, quadratic polynomial regression, and exponential and multiple linear regression models) on the basis of VIs were compared to get the optimal prediction method of crop parameters and yield. Read More

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Race/Ethnic Differences in Social Resources as Cognitive Risk and Protective Factors.

Res Hum Dev 2020 1;17(1):57-77. Epub 2020 Jul 1.

Department of Psychology, University of Michigan, Ann Arbor, MI, USA.

Overall social network size, often the sum of common lifetime relationships, including children, family, and friends, has been linked to cognitive impairment and Alzheimer's Disease. However, little research has examined the association between network size composition and cognitive function in middle-aged and older adults in the context of race/ethnicity. We investigated the associations between the number of close children, family, and friends independently with executive function (EF) and memory across a subsample of non-Hispanic Black, Hispanic, and non-Hispanic White participants who completed the Health and Retirement Study Harmonized Cognitive Assessment Protocol (N = 2,395). Read More

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Association between Business Travel, Health-Related Behaviors, and Adiposity.

J Occup Environ Med 2021 Jun 4. Epub 2021 Jun 4.

Department of Medicine; School of Medicine; Emory University, Atlanta, GA, USA (Bergquist, Roberts); Departments of Epidemiology, Environmental Health and Pediatrics; Rollins School of Public Health and School of Medicine; Emory University; Atlanta, GA, USA (Marcus); Department of Biostatistics & Bioinformatics, Rollins School of Public Health; Emory Biostatistics Collaboration Core; Emory University; Atlanta, GA, USA (Meng, Fei, Moore); Department of Biomedical Informatics; School of Medicine; Emory University, Atlanta, GA, USA (Robichaux).

Objective: To evaluate the associations between frequency of business travel and health behaviors and adiposity.

Methods: Retrospective cross-sectional analysis of de-identified electronic medical records from 795 corporate physical exams.

Results: Business travel frequency demonstrates a curvilinear relationship with body mass index and body composition in men and women, with domestic and international travel. Read More

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Urinary arsenic and heart disease mortality in NHANES 2003-2014.

Environ Res 2021 Jun 3:111387. Epub 2021 Jun 3.

Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY, USA.

Background: Evidence evaluating the prospective association between low-to moderate-inorganic arsenic (iAs) exposure and cardiovascular disease in the general US population is limited. We evaluated the association between urinary arsenic concentrations in National Health and Nutrition Examination Survey (NHANES) 2003-2014 and heart disease mortality linked from the National Death Index through 2015.

Methods: We modeled iAs exposure as urinary total arsenic and dimethylarsinate among participants with low seafood intake, based on low arsenobetaine levels (N = 4990). Read More

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Data-driven interval credibility constrained quadratic programming model for water quality management under uncertainty.

J Environ Manage 2021 Jun 2;293:112791. Epub 2021 Jun 2.

Department of Civil Engineering, McMaster University, 1280 Main Street West, Hamilton, L8S 4L7, ON, Canada. Electronic address:

Although integrated simulation-optimization modeling can provide a comprehensive and reliable analysis for water quality management (WQM), it is usually not easy to implement in practice. This study proposed a new efficient simulation-optimization modeling approach by leveraging the power of data-driven modeling, to support WQM under various uncertainties. A water quality simulation model is integrated with the optimization model, and then substituted by a series of numerical surrogate models based on inexact linear regression. Read More

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Impact of growth curve and dietary energy-to-protein ratio on productive performance of broiler breeders.

Poult Sci 2021 Mar 15;100(7):101131. Epub 2021 Mar 15.

Adaptation Physiology Group, Department of Animal Sciences, Wageningen University, Wageningen, The Netherlands.

The impact of growth curve (GC) and dietary energy-to-protein ratio on productive performance of broiler breeder females was investigated from 0 to 60 wk of age. One-day-old pullets (n = 1,536) were randomly allotted to 24 pens according to a 2 × 4 factorial arrangement, with 2 GC (standard growth curve = SGC or elevated growth curve = EGC, +15%) and 4 diets, differing in energy-to-protein ratio (96%, 100%, 104%, or 108% AME). Feed allocation per treatment was adapted weekly based on the desired GC, meaning that breeders fed the different diets within each GC were fed according to a paired-gain strategy. Read More

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An improved microelectrode method reveals significant emission of nitrous oxide from the rhizosphere of a long-term fertilized soil in the North China Plain.

Sci Total Environ 2021 Aug 18;783:147011. Epub 2021 Apr 18.

Key Laboratory of Agricultural Water Resources, Hebei Key Laboratory of Soil Ecology, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, China.

Microsensors are able to accurately quantify nitrous oxide (NO) emissions in microenvironments at high spatio-temporal resolution; yet, limited studies have been conducted on agricultural soils due to the inability to obtain electrical signal under conditions of low soil moisture. This study improved the calibration of a microelectrode for measuring NO emissions from agricultural soil. The microelectrode was applied to evaluate the effect of long-term fertilization with mineral fertilizer (NPK), complemented with pig manure (MNPK), straw (SNPK), or without fertilizer (CK), all with and without urea addition, on NO emissions from the soil, with explicit separation of the rhizosphere and the bulk soil compartments. Read More

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Modeling of photolytic degradation of sulfamethoxazole using boosted regression tree (BRT), artificial neural network (ANN) and response surface methodology (RSM); energy consumption and intermediates study.

Chemosphere 2021 Aug 6;276:130151. Epub 2021 Mar 6.

São Carlos Institute of Chemistry, University of São Paulo, Avenida Trabalhador São Carlense 400, 13566-590, São Carlos, SP, Brazil.

This study explores the boosted regression trees (BRT), artificial neural network (ANN) and response surface methodology (RSM) to model and optimize the operational variables for the simulation of the Photolytic degradation of Sulfamethoxazole (SMX) and concurrent total organic carbon (TOC) removal, based on the experimental data set. Four candidate variables involving initial pH (2-11), initial SMX concentration (50-200 mg L), temperature (15-45 °C) and time (6-120 min) were considered for simultaneous optimization of SMX and TOC degradation. The result revealed that all the three models are statistically considerable as the values of R, R, adj-R are >0. Read More

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