Read by QxMD icon Read

simulation model

Jin Feng Han, Shuo Liu, Jun Dai, Hao Qiu
With the aim to control and reduce rainfall and snowmelt runoff in northern cities in China, the summer runoff and spring snowmelt runoff in the studied area were simulated with the establishment of storm water management model (SWMM). According to the climate characteristics and the situation of the studied area, the low impact development (LID) green ecological strategies suitable for the studied area were established. There were three kinds of management strategies being used, including extended green roof, snow and rainwater harvesting devices, and grass-swales or trenches...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Yang Zhao, Xue Qing Zhang, Xiao Dong Bian
To investigate the early supplementary processes of fishre sources in the Bohai Sea, the geographically weighted regression (GWR) was introduced to the habitat suitability index (HSI) model. The Bohai Sea larval Japanese Halfbeak HSIGWR model was established with four environmental variables, including sea surface temperature (SST), sea surface salinity (SSS), water depth (DEP), and chlorophyll a concentration (Chl a). Results of the simulation showed that the four variables had different performances in August 2015...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Yi Zhe Li, Ting Long Zhang, Qiu Yu Liu, Ying Li
The ecological process models are powerful tools for studying terrestrial ecosystem water and carbon cycle at present. However, there are many parameters for these models, and weather the reasonable values of these parameters were taken, have important impact on the models simulation results. In the past, the sensitivity and the optimization of model parameters were analyzed and discussed in many researches. But the temporal and spatial heterogeneity of the optimal parameters is less concerned. In this paper, the BIOME-BGC model was used as an example...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Bo Ren, Jun Li, Xiao Juan Tong, Yan Mei Mu, Ping Meng, Jin Song Zhang
In this study, leaf photosynthetic CO2 -response curves of Quercus variabilis and Robinia pseudoacacia were measured using a Li-6400XT photosynthetic measurement system in the southern foot of the Taihang Mountain, China. The rectangular hyperbola model (RH), nonrectangular hyperbola model (NRH) andYe model (YZP) were used to fit photosynthetic-CO2 response curves and compare photosynthetic parameters, including the maximum net photosynthetic rate (Amax ), the initial carboxylation rate (η), light respiration rate (Rp ), CO2 compensation point (CCP) and CO2 saturation point (CSP)...
January 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Qiuzhi Ji, Young-Sik Yoo, Hira Alam, Geunyoung Yoon
PURPOSE: To characterise the impact of monofocal soft contact lens (SCL) and bifocal SCLs on refractive error, depth of focus (DoF) and orientation of blur in the peripheral visual field. METHODS: Monofocal and two bifocal SCLs, Acuvue Bifocal (AVB, Johnson & Johnson) and Misight Dual Focus (DF, CooperVision) with +2.0 D add power were modelled using a ray tracing program (ZEMAX) based on their power maps. These SCLs were placed onto the anterior corneal surface of the simulated Atchison myopic eye model to correct for -3...
May 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
Claudio S Quilodrán, Mathias Currat, Juan I Montoya-Burgos
Human-induced habitat changes may lead to the breakdown of reproductive barriers between distantly related species. This phenomenon may result in fertile first-generation hybrids (F1 ) that exclude the genome of one parental species during gametogenesis, thus disabling introgression. The species extinction risk associated with hybridization with genome exclusion is largely underappreciated because the phenomenon produces only F1 hybrid phenotype, leading to the misconception that hybrids are sterile and potentially of minor conservation concern...
April 24, 2018: Conservation Biology: the Journal of the Society for Conservation Biology
Di Lu, Chunxiao Zhou, Larry Tang, Ming Tan, Ao Yuan, Leighton Chan
Evaluating the accuracy (ie, estimating the sensitivity and specificity) of new diagnostic tests without the presence of a gold standard is of practical meaning and has been the subject of intensive study for several decades. Existing methods use 2 or more diagnostic tests under several basic assumptions and then estimate the accuracy parameters via the maximum likelihood estimation. One of the basic assumptions is the conditional independence of the tests given the disease status. This assumption is impractical in many real applications in veterinary research...
April 25, 2018: Statistics in Medicine
Debanjan Mukherjee, Neel D Jani, Jared Narvid, Shawn C Shadden
We describe a patient-specific simulation based investigation on the role of Circle of Willis anatomy in cardioembolic stroke. Our simulation framework consists of medical image-driven modeling of patient anatomy including the Circle, 3D blood flow simulation through patient vasculature, embolus transport modeling using a discrete particle dynamics technique, and a sampling based approach to incorporate parametric variations. A total of 24 (four patients and six Circle anatomies including the complete Circle) models were considered, with cardiogenic emboli of varying sizes and compositions released virtually and tracked to compute distribution to the brain...
April 24, 2018: Annals of Biomedical Engineering
Maryam Ghasemi, Burkhard A Hense, Hermann J Eberl, Christina Kuttler
We present a mathematical model of biofilm response to antibiotics, controlled by a quorum sensing system that confers increased resistance. The model is a highly nonlinear system of partial differential equations that we investigate in computer simulations. Our results suggest that an adaptive, quorum sensing-controlled, mechanism to switch between modes of fast growth with little protection and protective modes of slow growth may confer benefits to biofilm populations. It enhances the formation of micro-niches in the inner regions of the biofilm in which bacteria are not easily reached by antibiotics...
April 24, 2018: Bulletin of Mathematical Biology
Omid Bozorg-Haddad, Farzan Hamedi, Elahe Fallah-Mehdipour, Hugo A Loáiciga
Reverse stream flood routing determines the upstream hydrograph in a stream reach given the downstream hydrograph. The Muskingum model of flood routing involves parameters that govern the routed hydrograph. These parameters are herein estimated using simulation methods coupled with optimization tools to achieve optimized parameters. Different simulation methods are shown to perform unequally in the estimation of nonlinear Muskingum parameters. This paper presents two simulation methods for nonlinear Muskingum reverse flood routing: (1) Euler equations and (2) Runge-Kutta 4th order equations...
April 24, 2018: Environmental Monitoring and Assessment
Simon Hein, Ralf Petzold, Martin Schoenthaler, Ulrich Wetterauer, Arkadiusz Miernik
PURPOSE: To evaluate the thermal effect of Ho:YAG laser lithotripsy in a standardized in vitro model via real-time temperature measurement. METHODS: Our model comprised a 20 ml test tube simulating the renal pelvis that was immersed in a 37 °C water bath. Two different laser fibers [FlexiFib (15-45 W), RigiFib 1000 (45-100 W), LISA laser products OHG, Katlenburg-Lindau, Germany] were placed in the test tube. An Ho:YAG 100 W laser was used in all experiments (LISA)...
April 24, 2018: World Journal of Urology
A Bentivoglio, M Ancona, C A Brackley, G Gonnella, D Marenduzzo
We study a variant of a recently proposed non-equilibrium stochastic model for supercoiling-dependent transcription in DNA. In the case of a circular DNA molecule with overall positive supercoiling, we find a non-equilibrium phase transition between an absorbing phase, where all genes are switched off due to the supercoiling, and an active phase with a non-zero transcription rate. Mean field theory predicts that the transition should be continuous at a critical value of the background supercoiling, and we focus our analysis on this case...
April 25, 2018: Soft Matter
David Champredon, Marek Laskowski, Nathalie Charland, Seyed M Moghadas
New vaccine production technologies can significantly shorten the timelines for availability of a strain-specific vaccine in the event of an influenza pandemic. We sought to evaluate the potential benefits of early vaccination in reducing the clinical attack rate (CAR), taking into account the timing and speed of vaccination roll-out. Various scenarios corresponding to the transmissibility of a pandemic strain and vaccine prioritization strategies were simulated using an agent-based model of disease spread in Ontario, the largest Canadian province...
April 24, 2018: Scientific Reports
Genki Terashi, Daisuke Kihara
An increasing number of protein structures are determined by cryo-electron microscopy (cryo-EM) at near atomic resolution. However, tracing the main-chains and building full-atom models from EM maps of ~4-5 Å is still not trivial and remains a time-consuming task. Here, we introduce a fully automated de novo structure modeling method, MAINMAST, which builds three-dimensional models of a protein from a near-atomic resolution EM map. The method directly traces the protein's main-chain and identifies Cα positions as tree-graph structures in the EM map...
April 24, 2018: Nature Communications
Christina L Diller, Michael S Kelleman, Kenneth G Kupke, Sharon C Quary, Lazaros K Kochilas, Matthew E Oster
: media-1vid110.1542/5727212367001PEDS-VA_2017-4065 Video Abstract OBJECTIVES: Determine the performance of the American Academy of Pediatrics (AAP) critical congenital heart disease (CCHD) newborn screening algorithm and the impact of an alternative algorithm. METHODS: Screening was performed on term infants without a known CCHD diagnosis at or near 24 hours of age at a tertiary birth hospital by using the AAP algorithm from 2013 to 2016. Retrospective review from the birth hospital and the area's sole pediatric cardiac center identified true- and false-positives and true- and false-negatives...
April 24, 2018: Pediatrics
Paloma Nieto-Marín, Juan Jiménez-Jáimez, David Tinaquero, Silvia Alfayate, Raquel G Utrilla, María Del Mar Rodríguez Vázquez Del Rey, Francesca Perin, Geòrgia Sarquella-Brugada, Lorenzo Monserrat, Josep Brugada, Luis Tercedor, Juan Tamargo, Eva Delpón, Ricardo Caballero
INTRODUCTION AND OBJECTIVES: A known long QT syndrome-related mutation in Nav1.5 cardiac channels (p.R1644H) was found in 4 members of a Spanish family but only 1 of them showed prolongation of the QT interval. In the other 3 relatives, a novel missense mutation in Cav1.2 cardiac channels was found (p.S1961N). Here, we functionally analyzed p.S1961N Cav1.2 channels to elucidate whether this mutation regulates the expressivity of the long QT syndrome phenotype in this family. METHODS: L-type calcium current (ICaL ) recordings were performed by using the whole-cell patch-clamp technique in Chinese hamster ovary cells transiently transfected with native and/or p...
April 21, 2018: Revista Española de Cardiología
Martin A Dangelmayr, Paul W Reimus, Raymond H Johnson, James T Clay, James J Stone
This research assesses the ability of a GC SCM to simulate uranium transport under variable geochemical conditions typically encountered at uranium in-situ recovery (ISR) sites. Sediment was taken from a monitoring well at the SRH site at depths 192 and 193 m below ground and characterized by XRD, XRF, TOC, and BET. Duplicate column studies on the different sediment depths, were flushed with synthesized restoration waters at two different alkalinities (160 mg/l CaCO3 and 360 mg/l CaCO3 ) to study the effect of alkalinity on uranium mobility...
April 18, 2018: Journal of Contaminant Hydrology
Yeqi Huang, Tao Deng, Zhenning Li, Nan Wang, Chanqin Yin, Shiqiang Wang, Shaojia Fan
This article uses the WRF-CMAQ model to systematically study the source apportionment of PM2.5 under typical meteorological conditions in the dry season (November 2010) in the Pearl River Delta (PRD). According to the geographical location and the relative magnitude of pollutant emission, Guangdong Province is divided into eight subdomains for source apportionment study. The Brute-Force Method (BFM) method was implemented to simulate the contribution from different regions to the PM2.5 pollution in the PRD...
April 21, 2018: Science of the Total Environment
Anselm B M Fuermaier, Oliver Tucha, Janneke Koerts, Tabea S Send, Matthias Weisbrod, Steffen Aschenbrenner, Lara Tucha
OBJECTIVES: Several approaches, ranging from self-ratings of symptoms and impairments to objective neuropsychological testing, have been utilized during clinical evaluation in order to assess symptom and performance validity of individuals with attention-deficit/hyperactivity disorder (ADHD) in adulthood. Motor activity has not been considered yet in this context, which is surprising given that hyperactivity is a prominent characteristic of ADHD. Hence, the goal of the present study was to explore the incremental value of motor activity when assessing the credibility of individuals with adult ADHD at clinical evaluation...
April 25, 2018: Journal of Clinical and Experimental Neuropsychology
J Qian, S S Yu, J J Liu, L Chen, J H Jing
Objective: To analyze the biomechanics changes of lumbar spine caused by foraminotomy via percutaneous transforaminal endoscopic lumbar discectomy using the finite element method. Methods: Three healthy adult males (aged 35.6 to 42.3 years) without spinal diseases were enrolled in this study and 3D-CT scans were carried out to obtain the parameters of lumbar spine. Mimics software was applied to build a 3D finite element model of lumbar spine. Graded resections (1/4, 2/4, 3/4 and 4/4) of the left superior articular process of L(5) were done via percutaneous transforaminal endoscopic lumbar discectomy...
April 3, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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"