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https://www.readbyqxmd.com/read/28531978/quasi-static-and-ratcheting-properties-of-trabecular-bone-under-uniaxial-and-cyclic-compression
#1
Li-Lan Gao, Chao-Lei Wei, Chun-Qiu Zhang, Hong Gao, Nan Yang, Li-Min Dong
The quasi-static and ratcheting properties of trabecular bone were investigated by experiments and theoretical predictions. The creep tests with different stress levels were completed and it is found that both the creep strain and creep compliance increase rapidly at first and then increase slowly as the creep time goes by. With increase of compressive stress the creep strain increases and the creep compliance decreases. The uniaxial compressive tests show that the applied stress rate makes remarkable influence on the compressive behaviors of trabecular bone...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531846/synthesis-characterization-and-nonlinear-optical-nlo-properties-of-truxene-cored-diphenylamine-derivatives
#2
Fusheng Li, Baodong Zhao, Yu Chen, Yufei Zhang, Tao Wang, Song Xue
Three star-shaped compounds based on a truxene core (FS11, FS12 and FS13) were prepared. The truxene core is incorporating with asymmetric diphenylamines, including one phenyl of diphenylamine substituted by methoxy group and the other phenyl substituted by tolyl, fluorophenyl and phenylethynyl for FS11, FS12 and FS13, respectively. Their one-photon, two-photon absorption, geometric structures, electrochemical behavior and thermal properties were investigated. The absorption maxima of charge transfer band for FS11, FS12 and FS13 are 375nm, 373nm and 383nm, and the corresponding molar extinction coefficients of FS11, FS12 and FS13 is 79,950M(-1)cm(-1), 67,220M(-1)cm(-1) and 108,780M(-1)cm(-1)...
May 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28531243/increased-postural-sway-during-quiet-stance-as-a-risk-factor-for-prospective-falls-in-community-dwelling-elderly-individuals
#3
Jonas Johansson, Anna Nordström, Yngve Gustafson, Göran Westling, Peter Nordström
Objective: fall-related injuries constitute major health risks in older individuals, and these risks are projected to increase in parallel with increasing human longevity. Impaired postural stability is a potential risk factor related to falls, although the evidence is inconclusive, partly due to the lack of prospective studies. This study aimed to investigate how objective measures of postural sway predict incident falls. Design, setting and participants: this prospectively observational study included 1,877 community-dwelling individuals aged 70 years who participated in the Healthy Ageing Initiative between June 2012 and December 2015...
May 22, 2017: Age and Ageing
https://www.readbyqxmd.com/read/28531225/protein-charge-distribution-in-proteomes-and-its-impact-on-translation
#4
Rodrigo D Requião, Luiza Fernandes, Henrique José Araujo de Souza, Silvana Rossetto, Tatiana Domitrovic, Fernando L Palhano
As proteins are synthesized, the nascent polypeptide must pass through a negatively charged exit tunnel. During this stage, positively charged stretches can interact with the ribosome walls and slow the translation. Therefore, charged polypeptides may be important factors that affect protein expression. To determine the frequency and distribution of positively and negatively charged stretches in different proteomes, the net charge was calculated for every 30 consecutive amino acid residues, which corresponds to the length of the ribosome exit tunnel...
May 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28531125/characterizing-dynamic-walking-patterns-and-detecting-falls-with-wearable-sensors-using-gaussian-process-methods
#5
Taehwan Kim, Jeongho Park, Seongman Heo, Keehoon Sung, Jooyoung Park
By incorporating a growing number of sensors and adopting machine learning technologies, wearable devices have recently become a prominent health care application domain. Among the related research topics in this field, one of the most important issues is detecting falls while walking. Since such falls may lead to serious injuries, automatically and promptly detecting them during daily use of smartphones and/or smart watches is a particular need. In this paper, we investigate the use of Gaussian process (GP) methods for characterizing dynamic walking patterns and detecting falls while walking with built-in wearable sensors in smartphones and/or smartwatches...
May 20, 2017: Sensors
https://www.readbyqxmd.com/read/28530208/eit-imaging-of-admittivities-with-a-d-bar-method-and-spatial-prior-experimental-results-for-absolute-and-difference-imaging
#6
S J Hamilton
Electrical impedance tomography (EIT) is an emerging imaging modality that uses harmless electrical measurements taken on electrodes at a body's surface to recover information about the internal electrical conductivity and or permittivity. The image reconstruction task of EIT is a highly nonlinear inverse problem that is sensitive to noise and modeling errors making the image reconstruction task challenging. D-bar methods solve the nonlinear problem directly, bypassing the need for detailed and time-intensive forward models, to provide absolute (static) as well as time-difference EIT images...
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28530102/manipulating-coherent-plasmon-exciton-interaction-in-single-silver-nanorod-on-monolayer-wse2
#7
Di Zheng, Shunping Zhang, Qian Deng, Meng Kang, Peter Nordlander, Hongxing Xu
Strong coupling between plasmons and excitons in nanocavities can result in the formation of hybrid plexcitonic states. Understanding the dispersion relation of plexcitons is important both for fundamental quantum science and for applications including optoelectronics and nonlinear optics devices. The conventional approach, based on statistics over different nanocavities suffers from large inhomogeneities from the samples, owing to the non-uniformity of nanocavities and the lack of control over the locations and orientations of the excitons...
May 22, 2017: Nano Letters
https://www.readbyqxmd.com/read/28529760/denoising-techniques-in-adaptive-multi-resolution-domains-with-applications-to-biomedical-images
#8
Salim Lahmiri
Variational mode decomposition (VMD) is a new adaptive multi-resolution technique suitable for signal denoising purpose. The main focus of this work has been to study the feasibility of several image denoising techniques in empirical mode decomposition (EMD) and VMD domains. A comparative study is made using 11 techniques widely used in the literature, including Wiener filter, first-order local statistics, fourth partial differential equation, nonlinear complex diffusion process, linear complex diffusion process (LCDP), probabilistic non-local means, non-local Euclidean medians, non-local means, non-local patch regression, discrete wavelet transform and wavelet packet transform...
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28529525/melatonin-in-tuberous-sclerosis-complex-analysis-using-modern-mathematical-modeling-methods
#9
Justyna Paprocka, Marek Kijonka, Łukasz Boguszewicz, Maria Sokół
Purpose. The aim of the study was to assess melatonin secretion pattern in children with TSC and to compare it with the secretion patterns in children with and without epilepsy. Material and Methods. Melatonin secretion was measured every three hours using the RIA method in four children with recognized TSC. The parameters of the melatonin secretion models were interpreted and compared with those obtained for the patients with epilepsy (n = 76) and the children from the control, nonepileptic group (n = 36)...
2017: International Journal of Endocrinology
https://www.readbyqxmd.com/read/28529435/two-generalized-lyapunov-type-inequalities-for-a-fractional-p-laplacian-equation-with-fractional-boundary-conditions
#10
Yang Liu, Dapeng Xie, Dandan Yang, Chuanzhi Bai
In this paper, we investigate the existence of positive solutions for the boundary value problem of nonlinear fractional differential equation with mixed fractional derivatives and p-Laplacian operator. Then we establish two smart generalizations of Lyapunov-type inequalities. Some applications are given to demonstrate the effectiveness of the new results.
2017: Journal of Inequalities and Applications
https://www.readbyqxmd.com/read/28529434/a-modified-three-term-prp-conjugate-gradient-algorithm-for-optimization-models
#11
Yanlin Wu
The nonlinear conjugate gradient (CG) algorithm is a very effective method for optimization, especially for large-scale problems, because of its low memory requirement and simplicity. Zhang et al. (IMA J. Numer. Anal. 26:629-649, 2006) firstly propose a three-term CG algorithm based on the well known Polak-Ribière-Polyak (PRP) formula for unconstrained optimization, where their method has the sufficient descent property without any line search technique. They proved the global convergence of the Armijo line search but this fails for the Wolfe line search technique...
2017: Journal of Inequalities and Applications
https://www.readbyqxmd.com/read/28529153/model-of-vascular-desmoplastic-multispecies-tumor-growth
#12
Chin F Ng, Hermann B Frieboes
We present a three-dimensional nonlinear tumor growth model composed of heterogeneous cell types in a multicomponent-multispecies system, including viable, dead, healthy host, and extra-cellular matrix (ECM) tissue species. The model includes the capability for abnormal ECM dynamics noted in tumor development, as exemplified by pancreatic ductal adenocarcinoma, including dense desmoplasia typically characterized by a significant increase of interstitial connective tissue. An elastic energy is implemented to provide elasticity to the connective tissue...
May 18, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28528360/a-spiking-neural-network-model-of-the-midbrain-superior-colliculus-that-generates-saccadic-motor-commands
#13
Bahadir Kasap, A John van Opstal
Single-unit recordings suggest that the midbrain superior colliculus (SC) acts as an optimal controller for saccadic gaze shifts. The SC is proposed to be the site within the visuomotor system where the nonlinear spatial-to-temporal transformation is carried out: the population encodes the intended saccade vector by its location in the motor map (spatial), and its trajectory and velocity by the distribution of firing rates (temporal). The neurons' burst profiles vary systematically with their anatomical positions and intended saccade vectors, to account for the nonlinear main-sequence kinematics of saccades...
May 20, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28528287/population-pharmacokinetics-of-oxcarbazepine-and-its-metabolite-10-hydroxycarbazepine-in-healthy-subjects
#14
Natalicia de Jesus Antunes, Sven C van Dijkman, Vera Lucia Lanchote, Lauro Wichert-Ana, Eduardo Barbosa Coelho, Veriano Alexandre Junior, Osvaldo Massaiti Takayanagui, Eduardo Tozatto, Johan G C van Hasselt, Oscar Della Pasqua
Oxcarbazepine is indicated for the treatment of partial or generalized tonic-clonic seizures. The majority of the oxcarbazepine is converted into its active metabolite, 10-hydroxycarbazepine (MHD), which can exist as R-(-)- and S-(+)-MHD enantiomers. Here we describe the influence of the P-glycoprotein (P-gp) inhibitor verapamil, on the disposition of oxcarbazepine and MHD enantiomers, both of which are P-gp substrates. Healthy subjects (n=12) were randomized to oxcarbazepine or oxcarbazepine combined with verapamil at doses of 300mg b...
May 17, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28528255/molecular-structure-second-and-third-order-nonlinear-optical-properties-and-dft-studies-of-a-novel-non-centrosymmetric-chalcone-derivative-2e-3-4-fluorophenyl-1-4-1e-4-fluorophenyl-methylene-amino-phenyl-prop-2-en-1-one
#15
Shivaraj R Maidur, Parutagouda Shankaragouda Patil, Anusha Ekbote, Tze Shyang Chia, Ching Kheng Quah
In the present work, the title chalcone, (2E)-3-(4-fluorophenyl)-1-(4-{[(1E)-(4-fluorophenyl) methylene]amino}phenyl)prop-2-en-1-one (abbreviated as FAMFC), was synthesized and structurally characterized by single-crystal X-ray diffraction. The compound is crystallized in the monoclinic system with non-centrosymmetric space group P21 and hence it satisfies the essential condition for materials to exhibit second-order nonlinear optical properties. The molecular structure was further confirmed by using FT-IR and (1)H NMR spectroscopic techniques...
May 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28528137/fuzzy-dynamic-output-feedback-h%C3%A2-control-for-continuous-time-t-s-fuzzy-systems-under-imperfect-premise-matching
#16
Tao Zhao, Songyi Dian
This paper addresses a fuzzy dynamic output feedback H∞ control design problem for continuous-time nonlinear systems via T-S fuzzy model. The stability of the fuzzy closed-loop system which is formed by a T-S fuzzy model and a fuProd. Type: FTPzzy dynamic output feedback H∞ controller connected in a closed loop is investigated with Lyapunov stability theory. The proposed fuzzy controller does not share the same membership functions and number of rules with T-S fuzzy systems, which can enhance design flexibility...
May 17, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28527980/imaging-theory-for-the-istem-imaging-mode
#17
Florian F Krause, Andreas Rosenauer, Dirk Van Dyck
A relatively simple yet accurate analytical model for the image formation in the imaging scanning TEM (ISTEM) imaging mode, which implements partial spatial incoherence using a combination of scanning illumination and conventional imaging, is presented. Based on an object function approximation the ISTEM intensity can be divided into a constant, a linear and a nonlinear term. Under certain conditions, which are discussed, the formation of both linear and nonlinear terms can be expressed by convolutions with point spread functions...
April 25, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28527594/whole-globe-biomechanics-using-high-field-mri
#18
Andrew P Voorhees, Leon C Ho, Ning-Jiun Jan, Huong Tran, Yolandi van der Merwe, Kevin Chan, Ian A Sigal
The eye is a complex structure composed of several interconnected tissues acting together, across the whole globe, to resist deformation due to intraocular pressure (IOP). However, most work in the ocular biomechanics field only examines the response to IOP over smaller regions of the eye. We used high-field MRI to measure IOP induced ocular displacements and deformations over the whole globe. Seven sheep eyes were obtained from a local abattoir and imaged within 48 h using MRI at multiple levels of IOP. IOP was controlled with a gravity perfusion system and a cannula inserted into the anterior chamber...
May 17, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28527435/gauge-invariant-theory-for-super-high-resolution-raman-images
#19
Sai Duan, Guangjun Tian, Zhen Xie, Yi Luo
The use of a highly localized plasmonic field has enabled us to achieve sub-nanometer resolution of Raman images for single molecules. The inhomogeneous spatial distribution of plasmonic field has become an important factor that controls the interaction between the light and the molecule. We present here a gauge invariant interaction Hamiltonian (GIIH) to take into account the non-uniformity of the electromagnetic field distribution in the non-relativistic regime. The theory has been implemented for both resonant and nonresonant Raman processes within the sum-over-state framework...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527430/bjerrum-pairs-in-ionic-solutions-a-poisson-boltzmann-approach
#20
Ram M Adar, Tomer Markovich, David Andelman
Ionic solutions are often regarded as fully dissociated ions dispersed in a polar solvent. While this picture holds for dilute solutions, at higher ionic concentrations, oppositely charged ions can associate into dimers, referred to as Bjerrum pairs. We consider the formation of such pairs within the nonlinear Poisson-Boltzmann framework and investigate their effects on bulk and interfacial properties of electrolytes. Our findings show that pairs can reduce the magnitude of the dielectric decrement of ionic solutions as the ionic concentration increases...
May 21, 2017: Journal of Chemical Physics
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