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https://www.readbyqxmd.com/read/28931066/finite-time-synchronization-of-memristor-based-cohen-grossberg-neural-networks-with-mixed-delays
#1
Chuan Chen, Lixiang Li, Haipeng Peng, Yixian Yang
Finite time synchronization, which means synchronization can be achieved in a settling time, is desirable in some practical applications. However, most of the published results on finite time synchronization don't include delays or only include discrete delays. In view of the fact that distributed delays inevitably exist in neural networks, this paper aims to investigate the finite time synchronization of memristor-based Cohen-Grossberg neural networks (MCGNNs) with both discrete delay and distributed delay (mixed delays)...
2017: PloS One
https://www.readbyqxmd.com/read/28930469/simulation-study-on-the-reaction-diffusion-coupling-in-simple-pore-structures
#2
Yanping Li, Mingcan Zhao, Chengxiang Li, Wei Ge
Most porous media (just like catalyst pellets) have complicated pore structures, and understanding the coupling of the diffusion and reaction processes in these pores is very important for improving their performance. In this work, a diffusion factor (D) and a reaction factor (R) are proposed to quantitatively describe the diffusion and reaction performance in these pores respectively at molecular level. The yield in unit time is used to quantify their productivity and is expressed as the product of D and R...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930095/robust-and-practical-non-invasive-estimation-of-local-arterial-wave-speed-and-mean-blood-velocity-waveforms
#3
Remi Kowalski, Richard Beare, Marie Willemet, Jordi Alastruey, Joseph J Smolich, Michael M H Cheung, Jonathan P Mynard
Local arterial wave speed, a surrogate of vessel stiffness, can be estimated via the pressure-velocity (PU) and diameter-velocity (ln(D)U) loop methods. These assume negligible early-systolic reflected waves (RWes) and require measurement of cross-sectionally averaged velocity (U<sub>mean</sub>), which itself is a valuable quantity related to volumetric blood flow. However, RWes may not always be negligible and routine Doppler ultrasound typically provides maximum velocity waveforms or estimates of mean velocity subject to various errors (U<sub>raw</sub>)...
September 20, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28929429/segregation-of-a-binary-granular-mixture-in-a-vibrating-sawtooth-base-container
#4
Shahin Mobarakabadi, Neda Adrang, Mehdi Habibi, Ehsan Nedaaee Oskoee
A granular mixture of identical particles of different densities can be segregated when the system is shaken. We present an efficient method of continuously segregating a flow of randomly mixed identical spherical particles of different densities by shaking them in a quasi-two-dimensional container with a sawtooth-shaped base. Using numerical simulation we study the effect of direction of shaking (horizontal/vertical), geometry of the sawtooth, and the friction coefficient between the grains and the container walls on the segregation quality...
September 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28928974/the-influence-of-water-temperature-on-sockeye-salmon-heart-rate-recovery-following-simulated-fisheries-interactions
#5
Tanya S Prystay, Erika J Eliason, Michael J Lawrence, Melissa Dick, Jacob W Brownscombe, David A Patterson, Glenn T Crossin, Scott G Hinch, Steven J Cooke
Selective harvest policies have been implemented in North America to enhance the conservation of Pacific salmon (Oncorhynchus spp.) stocks, which has led to an increase in the capture and release of fish by all fishing sectors. Despite the immediate survival benefits, catch-and-release results in capture stress, particularly at high water temperatures, and this can result in delayed post-release mortality minutes to days later. The objective of this study was to evaluate how different water temperatures influenced heart rate disturbance and recovery of wild sockeye salmon (Oncorhynchus nerka) following fisheries interactions (i...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28928756/prioritizing-crop-management-to-increase-nitrogen-use-efficiency-in-australian-sugarcane-crops
#6
Peter J Thorburn, Jody S Biggs, Jeda Palmer, Elizabeth A Meier, Kirsten Verburg, Danielle M Skocaj
Sugarcane production relies on the application of large amounts of nitrogen (N) fertilizer. However, application of N in excess of crop needs can lead to loss of N to the environment, which can negatively impact ecosystems. This is of particular concern in Australia where the majority of sugarcane is grown within catchments that drain directly into the World Heritage listed Great Barrier Reef Marine Park. Multiple factors that impact crop yield and N inputs of sugarcane production systems can affect N use efficiency (NUE), yet the efficacy many of these factors have not been examined in detail...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28927724/empirical-evidence-for-the-relationship-between-cognitive-workload-and-attentional-reserve
#7
Kyle J Jaquess, Rodolphe J Gentili, Li-Chuan Lo, Hyuk Oh, Jing Zhang, Jeremy C Rietschel, Matthew W Miller, Ying Ying Tan, Bradley D Hatfield
While the concepts of cognitive workload and attentional reserve have been thought to have an inverse relationship for some time, such a relationship has never been empirically tested. This was the purpose of the present study. Aspects of the electroencephalogram were used to assess both cognitive workload and attentional reserve. Specifically, spectral measures of cortical activation were used to assess cognitive workload, while amplitudes of the event-related potential from the presentation of unattended "novel" sounds were used to assess attentional reserve...
September 16, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28927657/endoscopic-training-a-nationwide-survey-of-french-fellows-in-gastroenterology
#8
Aurélien Amiot, Guillaume Conroy, Yann Le Baleur, Jérôme Winkler, Maxime Palazzo, Xavier Treton
BACKGROUND: During their 4 years of training, French fellows in gastroenterology should acquire theoretical and practical competency in gastrointestinal (GI) endoscopy. AIMS: To evaluate the delivery of endoscopy training to French GI fellows and perception of learning. METHODS: A nationwide electronic survey was carried out of French GI fellows using an anonymous, 17-item electronic questionnaire. RESULTS: A total of 291 out of 484 (60%) GI fellows responded to the survey...
September 15, 2017: Clinics and Research in Hepatology and Gastroenterology
https://www.readbyqxmd.com/read/28926272/collective-lasing-behavior-of-monolithic-gan-ingan-core-shell-nanorod-lattice-under-room-temperature
#9
Chia-Yen Huang, Jing-Jie Lin, Tsu-Chi Chang, Che-Yu Liu, Tzu-Ying Tai, Kuo-Bin Hong, Tien-Chang Lu, Hao-Chung Kuo
We demonstrated a monolithic GaN-InGaN core-shell nanorod lattice lasing under room temperature. The threshold pumping density was as low as 140 kW/cm2 with a quality factor as high as 1940. The narrow mode spacing between lasing peaks suggested a strong coupling between adjacent whisper gallery modes (WGM), which was confirmed with the far-field patterns. Excitation area dependent photoluminescence revealed that the long-wavelength lasing modes dominated the collective lasing behavior under a large excitation area...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28925730/impact-of-frequent-interruption-on-nurses-patient-controlled-analgesia-programming-performance
#10
Kristi R Campoe, Karen K Giuliano
OBJECTIVE: The purpose was to add to the body of knowledge regarding the impact of interruption on acute care nurses' cognitive workload, total task completion times, nurse frustration, and medication administration error while programming a patient-controlled analgesia (PCA) pump. BACKGROUND: Data support that the severity of medication administration error increases with the number of interruptions, which is especially critical during the administration of high-risk medications...
September 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28924572/stereovision-based-integrated-system-for-point-cloud-reconstruction-and-simulated-brain-shift-validation
#11
Xiaochen Yang, Logan W Clements, Ma Luo, Saramati Narasimhan, Reid C Thompson, Benoit M Dawant, Michael I Miga
Intraoperative soft tissue deformation, referred to as brain shift, compromises the application of current image-guided surgery navigation systems in neurosurgery. A computational model driven by sparse data has been proposed as a cost-effective method to compensate for cortical surface and volumetric displacements. We present a mock environment developed to acquire stereoimages from a tracked operating microscope and to reconstruct three-dimensional point clouds from these images. A reconstruction error of 1 mm is estimated by using a phantom with a known geometry and independently measured deformation extent...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28922605/alkane-coiling-in-perfluoroalkane-solutions-a-new-primitive-solvophobic-effect
#12
Pedro Morgado, Ana Rosa Garcia, Luís F G Martins, Laura M Ilharco, Eduardo J M Filipe
In this work we demonstrate that n-alkanes coil when mixed with perfluoroalkanes, changing their conformational equilibria to more globular states, with a higher number of gauche conformations. The new coiling effect is here observed in fluids governed exclusively by dispersion interactions, contrarily to other examples in which hydrogen bonding and polarity play important roles. FTIR spectra of liquid mixtures of n-hexane and perfluorohexane unambiguously reveal that the population of n-hexane molecules in all-trans conformation reduces from 32% in the pure n-alkane to practically zero...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28922141/towards-an-in-plane-methodology-to-track-breast-lesions-by-using-mammograms-and-patient-specific-finite-element-simulations
#13
Andres Lapuebla-Ferri, Jose Cegoñino-Banzo, Antonio-Jose Jimenez-Mocholi, Amaya Perez Del Palomar
In breast cancer screening or diagnosis, it is usual to combine different images in order to locate a lesion as accurately as possible. These images are generated by using a single or several imaging techniques. As X-ray based mammography is used widespread, a breast lesion is located in the same plane of the image (mammogram), but tracking of a breast lesion across mammograms corresponding to different views is a daring task for medical physicians. According to this, simulation tools and methodologies that use patient-specific numerical models can facilitate the task of fusing information from different images...
September 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28920898/hybrid-pre-log-and-post-log-image-reconstruction-for-computed-tomography
#14
Guobao Wang, Jian Zhou, Zhou Yu, Wenli Wang, Jinyi Qi
Tomographic image reconstruction for low-dose CT is increasingly challenging as dose continues to reduce in clinical applications. Pre-log domain methods and post-log domain methods have been proposed individually and each method has its own disadvantage. While having the potential to improve image quality for low-dose data by using an accurate imaging model, pre-log domain methods suffer slow convergence in practice due to the nonlinear transformation from the image to measurements. In contrast, post-log domain methods have fast convergence speed but the resulting image quality is suboptimal for low-count CT data because the log transformation is extremely unreliable for low-count measurements and undefined for negative values...
September 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28920892/computationally-efficient-algorithms-for-sparse-dynamic-solutions-to-the-eeg-source-localization-problem
#15
Elvira Pirondini, Behtash Babadi, Gabriel Obregon-Henao, Camilo Lamus, Wasim Q Malik, Matti S Hamalainen, Patrick L Purdon
OBJECTIVE: Electroencephalography (EEG) and magnetoencephalography (MEG) non-invasively record scalp electromagnetic fields generated by cerebral currents, revealing millisecond-level brain dynamics useful for neuroscience and clinical applications. Estimating the currents that generate these fields, i.e., source localization, is an ill-conditioned inverse problem. Solutions to this problem have focused on spatial continuity constraints, dynamic modeling, or sparsity constraints. The combination of these key ideas could offer significant performance improvements, but substantial computational costs pose a challenge for practical application of such approaches...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28919709/puerarin-transport-across-rat-nasal-epithelial-cells-and-the-influence-of-compatibility-with-peoniflorin-and-menthol
#16
Lin Zhang, Shou-Ying Du, Yang Lu, Chang Liu, Hui-Chao Wu, Zhi-Hao Tian, Min Wang, Chang Yang
Nose-to-brain transport can provide an excellent pathway for drugs of the central nervous system. Consequently, how to make full use of this pathway in practical applications has become a focus of drug design. However, many aspects affecting drug delivery from the nose to the brain remain unclear. This study aimed to more deeply investigate the transport of puerarin and to explore the mechanism underlying the influence of compatible drugs on puerarin permeability in a primary cell model simulating the nasal mucosa...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28919384/the-combination-of-gis-and-biphasic-to-better-predict-in-vivo-dissolution-of-bcs-class-iib-drugs-ketoconazole-and-raloxifene
#17
Yasuhiro Tsume, Naoto Igawa, Adam J Drelich, Gregory E Amidon, Gordon L Amidon
The formulation developments and the in vivo assessment of Biopharmaceutical Classification System (BCS) class II drugs are challenging due to their low solubility and high permeability in the human gastrointestinal (GI) tract. Since the GI environment influences the drug dissolution of BCS class II drugs, the human GI characteristics should be incorporated into the in vitro dissolution system to predict bioperformance of BCS class II drugs. An absorptive compartment may be important in dissolution apparatus for BCS class II drugs, especially for bases (BCS IIb) because of high permeability, precipitation and supersaturation...
September 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28918810/progress-in-endoscopic-ultrasonography-training-in-therapeutic-or-interventional-endoscopic-ultrasonography
#18
REVIEW
Monica Saumoy, Michel Kahaleh
Therapeutic endoscopic ultrasound is a rapidly expanding field, requiring training beyond the 3-year gastroenterology fellowship and at least an additional year in a structured advanced endoscopy fellowship program with mentorship from an expert at a sufficiently high-volume center. Simulation models can provide initial instruction on technique and increase familiarity with the rapidly changing devices. Trainees must also be given a graduated level of independence to perform each step and, eventually, be able to practice on a variety of endoscopic targets...
October 2017: Gastrointestinal Endoscopy Clinics of North America
https://www.readbyqxmd.com/read/28918498/modeling-the-decision-of-mental-health-providers-to-implement-evidence-based-children-s-mental-health-services-a-discrete-choice-conjoint-experiment
#19
Charles E Cunningham, Melanie Barwick, Heather Rimas, Stephanie Mielko, Raluca Barac
Using an online, cross sectional discrete choice experiment, we modeled the influence of 14 implementation attributes on the intention of 563 providers to adopt hypothetical evidence-based children's mental health practices (EBPs). Latent class analysis identified two segments. Segment 1 (12%) would complete 100% of initial training online, devote more time to training, make greater changes to their practices, and introduce only minor modifications to EBPs. Segment 2 (88%) preferred fewer changes, more modifications, less training, but more follow-up...
September 16, 2017: Administration and Policy in Mental Health
https://www.readbyqxmd.com/read/28918445/pre-emptive-intestinal-transplant-the-surgeon-s-point-of-view
#20
REVIEW
Augusto Lauro, Ignazio R Marino, Kishore R Iyer
Pre-emptive transplantation is a well-established practice for certain types of end-organ failure such as in the use of kidney transplantation. For irreversible intestinal failure, total parenteral nutrition (TPN) remains the gold standard, due to the suboptimal long-term results of intestinal transplantation. As such, the only role for pre-emptive transplantation, if at all, will be for patients identified to be at high risk of complications and mortality while on definitive long-term TPN. In these patients, the timing of early listing and transplantation could become life-saving, taking into account that mortality on the waiting list is still the highest for intestinal candidates...
September 16, 2017: Digestive Diseases and Sciences
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