keyword
MENU ▼
Read by QxMD icon Read
search

Differential equation

keyword
https://www.readbyqxmd.com/read/28938022/advising-caution-in-studying-seasonal-oscillations-in-crime-rates
#1
Kun Dong, Yunbai Cao, Beatrice Siercke, Matthew Wilber, Scott G McCalla
Most types of crime are known to exhibit seasonal oscillations, yet the annual variations in the amplitude of this seasonality and their causes are still uncertain. Using a large collection of data from the Houston and Los Angeles Metropolitan areas, we extract and study the seasonal variations in aggravated assault, break in and theft from vehicles, burglary, grand theft auto, rape, robbery, theft, and vandalism for many years from the raw daily data. Our approach allows us to see various long term and seasonal trends and aberrations in crime rates that have not been reported before...
2017: PloS One
https://www.readbyqxmd.com/read/28936722/kinetics-of-photosystem-ii-electron-transport-a-mathematical-analysis-based-on-chlorophyll-fluorescence-induction
#2
Agu Laisk, Vello Oja
The OJDIP rise in chlorophyll fluorescence during induction at different light intensities was mathematically modeled using 24 master equations describing electron transport through photosystem II (PSII) plus ordinary differential equations for electron budgets in plastoquinone, cytochrome f, plastocyanin, photosystem I, and ferredoxin. A novel feature of the model is consideration of electron in- and outflow budgets resulting in changes in redox states of Tyrosine Z, P680, and QA as sole bases for changes in fluorescence yield during the transient...
September 21, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28934210/oncolytic-potency-and-reduced-virus-tumor-specificity-in-oncolytic-virotherapy-a-mathematical-modelling-approach
#3
Khaphetsi Joseph Mahasa, Amina Eladdadi, Lisette de Pillis, Rachid Ouifki
In the present paper, we address by means of mathematical modeling the following main question: How can oncolytic virus infection of some normal cells in the vicinity of tumor cells enhance oncolytic virotherapy? We formulate a mathematical model describing the interactions between the oncolytic virus, the tumor cells, the normal cells, and the antitumoral and antiviral immune responses. The model consists of a system of delay differential equations with one (discrete) delay. We derive the model's basic reproductive number within tumor and normal cell populations and use their ratio as a metric for virus tumor-specificity...
2017: PloS One
https://www.readbyqxmd.com/read/28933951/a-developmentally-relevant-approach-to-classifying-nonconsensual-sexual-experiences-in-the-study-of-women-s-sexual-well-being
#4
Chelsea D Kilimnik, Cindy M Meston
In this article we propose a sexual developmental approach to classifying the onset of nonconsensual sexual experiences (NSEs) that differs from the traditional age cutoff approach. Online measures of sexual self-schemas, sexual response, and sexual functioning were administered to 797 women with and without NSE histories. Women were grouped based on when their NSEs first occurred in reference to their age of menarche and age of their first consensual sexual experience (i.e., premenarche onset, postmenarche preconsensual onset, postconsensual onset, and no NSEs)...
September 21, 2017: Journal of Sex Research
https://www.readbyqxmd.com/read/28933566/validation-of-the-messi-among-adult-workers-and-young-students-general-health-and-personality-correlates
#5
Juan F Díaz-Morales, Christoph Randler, Arturo Arrona-Palacios, Ana Adan
The aim of this study was to provide validity for the Spanish version of the Morningness-Eveningness-Stability Scale - improved (MESSi), a novel evolved assessment of circadian typology which considers the subjective phase and amplitude by morning affect (MA), eveningness (EV) and distinctness (DI; subjective amplitude) sub-scales. Convergence validity of the MESSi with the reduced Morningness-Eveningness Questionnaire (rMEQ) and relationships with the General Health Questionnaire (GHQ-12) and sensitivity to reward and punishment (SR and SP) were analyzed...
September 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28930158/a-method-for-medical-diagnosis-based-on-optical-fluence-rate-distribution-at-tissue-surface
#6
Omnia Hamdy, Jala El-Azab, Tarek A Al-Saeed, Mahmoud F Hassan, Nahed H Solouma
Optical differentiation is a promising tool in biomedical diagnosis mainly because of its safety. The optical parameters' values of biological tissues differ according to the histopathology of the tissue and hence could be used for differentiation. The optical fluence rate distribution on tissue boundaries depends on the optical parameters. So, providing image displays of such distributions can provide a visual means of biomedical diagnosis. In this work, an experimental setup was implemented to measure the spatially-resolved steady state diffuse reflectance and transmittance of native and coagulated chicken liver and native and boiled breast chicken skin at 635 and 808 nm wavelengths laser irradiation...
September 20, 2017: Materials
https://www.readbyqxmd.com/read/28930057/tlr4-methylation-moderates-the-relationship-between-alcohol-use-severity-and-gray-matter-loss
#7
Hollis C Karoly, Rachel E Thayer, Sarah L Hagerty, Kent E Hutchison
OBJECTIVE: Alcohol use disorders (AUDs) are associated with decreased gray matter, and neuroinflammation is one mechanism through which alcohol may confer such damage, given that heavy alcohol use may promote neural damage via activation of toll-like receptor 4 (TLR4)-mediated inflammatory signaling cascades. We previously demonstrated that TLR4 is differentially methylated in AUD compared with control subjects, and the present study aims to extend this work by examining whether TLR4 methylation moderates the relationship between alcohol use and gray matter...
September 2017: Journal of Studies on Alcohol and Drugs
https://www.readbyqxmd.com/read/28927941/gaming-the-system-creation-of-a-random-case-generating-game-for-use-in-morning-report
#8
Pallavi Kamra, Emily C Borman-Shoap, Lei Zhang, Michael B Pitt
BACKGROUND: Case-based morning reports are a staple of residency education. Little is known about the role of game-based learning in facilitating case-based discussions. OBJECTIVES: Compare an educational game that can be used for creating impromptu case-based sessions to traditional morning report. METHODS: We created a game called Differential Diagnosis Slot Machine, which allows participants to quickly generate theoretical cases for discussion...
September 16, 2017: Academic Pediatrics
https://www.readbyqxmd.com/read/28927468/recent-advances-in-analysis-of-differential-item-functioning-in-health-research-using-the-rasch-model
#9
Curt Hagquist, David Andrich
BACKGROUND: Rasch analysis with a focus on Differential Item Functioning (DIF) is increasingly used for examination of psychometric properties of health outcome measures. To take account of DIF in order to retain precision of measurement, split of DIF-items into separate sample specific items has become a frequently used technique. The purpose of the paper is to present and summarise recent advances of analysis of DIF in a unified methodology. In particular, the paper focuses on the use of analysis of variance (ANOVA) as a method to simultaneously detect uniform and non-uniform DIF, the need to distinguish between real and artificial DIF and the trade-off between reliability and validity...
September 19, 2017: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/28926044/running-out-of-lithium-a-route-to-differentiate-between-capacity-losses-and-active-lithium-losses-in-lithium-ion-batteries
#10
Florian Holtstiege, Andrea Wilken, Martin Winter, Tobias Placke
Active lithium loss (ALL) resulting in a capacity loss (QALL), which is caused by lithium consuming parasitic reactions like SEI formation, is a major reason for capacity fading and, thus, for a reduction of the usable energy density of lithium-ion batteries (LIBs). QALL is often equated with the accumulated irreversible capacity (QAIC). However, QAIC is also influenced by non-lithium consuming parasitic reactions, which do not reduce the active lithium content of the cell, but induce a parasitic current. In this work, a novel approach is proposed in order to differentiate between QAIC and QALL...
September 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28922756/the-meiotic-regulator-jason-utilizes-alternative-translation-initiation-sites-to-produce-differentially-localized-forms
#11
Simon Cabout, Megan P Leask, Shiny Varghese, Jun Yi, Benjamin Peters, Lei Liu Conze, Claudia Köhler, Lynette Brownfield
The JASON (JAS) protein plays an important role in maintaining an organelle band across the equator of male meiotic cells during the second division, with its loss leading to unreduced pollen in Arabidopsis. In roots cells, JAS localizes to the Golgi, tonoplast and plasma membrane. Here we explore the mechanism underlying the localization of JAS. Overall, our data show that leaky ribosom scanning and alternative translation initiation sites (TISs) likely leads to the formation of two forms of JAS: a long version with an N-terminal Golgi localization signal and a short version with a different N-terminal signal targeting the protein to the plasma membrane...
July 10, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28922129/dissipativity-and-synchronization-of-generalized-bam-neural-networks-with-multivariate-discontinuous-activations
#12
Dongshu Wang, Lihong Huang, Longkun Tang
This paper is concerned with the dissipativity and synchronization problems of a class of delayed bidirectional associative memory (BAM) neural networks in which neuron activations are modeled by discontinuous bivariate functions. First, the concept of the Filippov solution is extended to functional differential equations with discontinuous right-hand sides and mixed delays via functional differential inclusions. The global dissipativity of the Filippov solution to the considered BAM neural networks is proven using generalized Halanay inequalities and matrix measure approaches...
September 14, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28919383/prediction-of-air-entrapment-in-tableting-an-approximate-solution
#13
Antonios Zavaliangos, Jeffrey M Katz, Dominick Daurio, Michael Johnson, Armen Pirjanian, Fernando Alvarez-Nunez
Αn approximate solution is presented for the prediction of air entrapment during tableting. Assuming weak coupling of the deformation of the solid phase, the flow of interstitial air and a set of reasonable additional geometric assumptions, the general problem is reduced to one dimension. Experimental values of air permeability through tablet specimens of commonly used pharmaceutical excipients were obtained using a 3D printed test cell outfitted to a powder rheometer. Using these values, combined with a numerical solution of the governing partial differential equation, parametric studies are presented that demonstrate the importance of permeability, compaction speed, tablet size, and punch-die tolerance on air entrapment...
September 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28919166/kinetic-analysis-of-oxygen-dynamics-under-a-variable-work-rate
#14
Alexander Artiga Gonzalez, Raphael Bertschinger, Fabian Brosda, Thorsten Dahmen, Patrick Thumm, Dietmar Saupe
Measurements of oxygen uptake are central to methods for the assessment of physical fitness and endurance capabilities in athletes. Two important parameters extracted from such data of incremental exercise tests are the maximal oxygen uptake and the critical power. A commonly accepted model of the dynamics of oxygen uptake during exercise at a constant work rate comprises a constant baseline oxygen uptake, an exponential fast component, and another exponential slow component for heavy and severe work rates...
September 14, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28918570/mathematical-description-of-drug-target-interactions-application-to-biologics-that-bind-to-targets-with-two-binding-sites
#15
Leonid Gibiansky, Ekaterina Gibiansky
The emerging discipline of mathematical pharmacology occupies the space between advanced pharmacometrics and systems biology. A characteristic feature of the approach is application of advance mathematical methods to study the behavior of biological systems as described by mathematical (most often differential) equations. One of the early application of mathematical pharmacology (that was not called this name at the time) was formulation and investigation of the target-mediated drug disposition (TMDD) model and its approximations...
September 16, 2017: Journal of Pharmacokinetics and Pharmacodynamics
https://www.readbyqxmd.com/read/28915366/structural-encoding-processes-contribute-to-individual-differences-in-face-and-object-cognition-inferences-from-psychometric-test-performance-and-event-related-brain-potentials
#16
Hadiseh Nowparast Rostami, Werner Sommer, Changsong Zhou, Oliver Wilhelm, Andrea Hildebrandt
The enhanced N1 component in event-related potentials (ERP) to face stimuli, termed N170, is considered to indicate the structural encoding of faces. Previously, individual differences in the latency of the N170 have been related to face and object cognition abilities. By orthogonally manipulating content domain (faces vs objects) and task demands (easy/speed vs difficult/accuracy) in both psychometric and EEG tasks, we investigated the uniqueness of the processes underlying face cognition as compared with object cognition and the extent to which the N1/N170 component can explain individual differences in face and object cognition abilities...
August 19, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28914803/achieving-congestion-mitigation-using-distributed-power-control-for-spectrum-sensor-nodes-in-sensor-network-aided-cognitive-radio-ad-hoc-networks
#17
Long Zhang, Haitao Xu, Fan Zhuo, Hucai Duan
The data sequence of spectrum sensing results injected from dedicated spectrum sensor nodes (SSNs) and the data traffic from upstream secondary users (SUs) lead to unpredictable data loads in a sensor network-aided cognitive radio ad hoc network (SN-CRN). As a result, network congestion may occur at a SU acting as fusion center when the offered data load exceeds its available capacity, which degrades network performance. In this paper, we present an effective approach to mitigate congestion of bottlenecked SUs via a proposed distributed power control framework for SSNs over a rectangular grid based SN-CRN, aiming to balance resource load and avoid excessive congestion...
September 15, 2017: Sensors
https://www.readbyqxmd.com/read/28914350/a-stochastic-model-for-speciation-by-mating-preferences
#18
Camille Coron, Manon Costa, Hélène Leman, Charline Smadi
Mechanisms leading to speciation are a major focus in evolutionary biology. In this paper, we present and study a stochastic model of population where individuals, with type a or A, are equivalent from ecological, demographical and spatial points of view, and differ only by their mating preference: two individuals with the same genotype have a higher probability to mate and produce a viable offspring. The population is subdivided in several patches and individuals may migrate between them. We show that mating preferences by themselves, even if they are very small, are enough to entail reproductive isolation between patches, and we provide the time needed for this isolation to occur as a function of the carrying capacity...
September 15, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28913178/modeling-cancer-cell-growth-dynamics-in-vitro-in-response-to-antimitotic-drug-treatment
#19
Alexander Lorz, Dana-Adriana Botesteanu, Doron Levy
Investigating the role of intrinsic cell heterogeneity emerging from variations in cell-cycle parameters and apoptosis is a crucial step toward better informing drug administration. Antimitotic agents, widely used in chemotherapy, target exclusively proliferative cells and commonly induce a prolonged mitotic arrest followed by cell death via apoptosis. In this paper, we developed a physiologically motivated mathematical framework for describing cancer cell growth dynamics that incorporates the intrinsic heterogeneity in the time individual cells spend in the cell-cycle and apoptosis process...
2017: Frontiers in Oncology
https://www.readbyqxmd.com/read/28912258/frank-starling-mechanism-and-short-term-adjustment-of-cardiac-flow
#20
José Guilherme Chaui-Berlinck, Luiz Henrique Alves Monteiro
The Frank-Starling Law of the heart is a filling-force mechanism (FFm), a positive relationship between the distension of a ventricular chamber and its force of ejection, and such a mechanism is found across all the studied vertebrate lineages. The functioning of the cardiovascular system is usually described by means of the cardiac and vascular functions, the former related to the contractility of the heart and the latter related to the after-load imposed to the ventricle. The crossing of these functions is the so-called operation point, and the FFm is supposed to play a stabilizing role for the short-term variations in the working of the system...
September 14, 2017: Journal of Experimental Biology
keyword
keyword
81171
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"