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Items from 1 to 20 out of 37,791 results

article

Dynamical analysis of a stage structured predator–prey system with impulsive diffusion and generic functional response

Yuanfu Shao, Ying Li, Y. Shao, Y. Li

Applied Mathematics and Computation > 2013 > 220 > Complete > 472-481

Based on the predator–prey system with stage structure and generalized functional response, an impulsive differential system to model the process of periodical diffusion at different fixed time is proposed and investigated. By using comparison theorem of impulsive differential equation and some analysis techniques, sufficient conditions ensuring the existence of a predator-extinction positive periodic...

article

Thin-Disk Yb:YAG Oscillator-Amplifier Laser, ASE, and Effective Yb:YAG Lifetime

A. Antognini, K. Schuhmann, F.D. Amaro, F. Biraben, more

IEEE Journal of Quantum Electronics > 2009 > 45 > 8 > 993 - 1005

We report on a thin-disk Yb:YAG laser made from a Q-switched oscillator and a multipass amplifier delivering pulses of 48 mJ at 1030 nm. The peculiar requirements for this laser are the short delay time (< 500 ns) between electronic trigger and optical output pulse and the time randomness with which these triggers occur (with trigger to next trigger delay ges 1.5 ms). Details concerning the oscillator...

article

Clinical algorithms for identification and management of delay in the progression of first and second stage of labour

J Pasquale, M Chamillard, V Diaz, C Gialdini, more

BJOG: An International Journal of Obstetrics & Gynaecology > 131 > S2 > 28 - 36

Aim To develop clinical algorithms for the assessment and management of slow progress of labour. Population Low‐risk singleton, term, pregnant women in labour. Setting Institutional births in low‐ and middle‐income countries. Search strategy We systematically reviewed the literature on normal labour progression, and guidance on clinical management of abnormally slow progression from 1 December...

article

Causes and impact of delays during the COVID‐19 pandemic on head and neck cancer diagnosis

Maru Gete, Shao Hui Huang, Jolie Ringash, Jonathan Irish, more

Head & Neck > 46 > 9 > 2197 - 2205

Background The causes for delays during the COVID19 pandemic and their impact on head and neck cancer (HNC) diagnosis and staging are not well described. Methods Two cohorts were defined a priori for review and analysis—a Pre‐Pandemic cohort (June 1 to December 31, 2019) and a Pandemic cohort (June 1 to December 31, 2020). Delays were categorized as COVID‐19 related or not, and as clinician, patient,...

article

Reconfigured passivity‐based control strategy of LCL‐type grid‐connected inverter under complex grid conditions

Min Huang, Wei Lin, Zhicheng Zhang, Weimin Wu, more

International Journal of Circuit Theory and Applications > 52 > 8 > 4007 - 4025

LCL‐type grid‐connected inverters have seen extensive use of the passivity‐based control (PBC) system. However, traditional PBC systems rarely take time delay into account while designing the system or doing a stability study. Therefore, utilizing Lyapunov's criterion to conclude that the system is stable is not accurate. The analysis revealed that the differential terms of PBC loops with the Euler–Lagrange...

article

Mathematical analysis of stability and Hopf bifurcation in a delayed HIV infection model with saturated immune response

Zihao Hu, Junxian Yang, Qiang Li, Song Liang, more

Mathematical Methods in the Applied Sciences > 47 > 12 > 9834 - 9857

This paper explores the dynamics analysis of a human immunodeficiency virus (HIV) model with saturated cytotoxic T lymphocyte (CTL) immune response and Beddington–DeAngelis infection rate. There are two time delays in the model to describe the time needed for infection of cell and CTL immune response generation, respectively. We obtain two thresholds and three possible equilibria from the model. By...

article

The effect of patient symptom awareness on the visual outcome in retinal detachment

B. M. Govers, S. Keijser, M. El Kandoussi, K. A. Overdam, more

Acta Ophthalmologica > 102 > 5 > 506 - 512

Purpose To explore whether a patient's prior knowledge of the symptoms associated with rhegmatogenous retinal detachment (RRD) relates to the visual outcome after treatment. Methods We performed a prospective survey study on 126 patients receiving treatment for primary RRD between March and July 2021. Results Thirty‐seven per cent (n = 47) of patients responded that they were aware of the RRD...

article

Age‐related changes in cheek skin movement: A case study of Japanese women

Motonori Kurosumi, Jiro Yabuzaki, Mari Kuribayashi, Koji Mizukoshi

Skin Research and Technology > 30 > 7 > n/a - n/a

Background The majority of conventional studies on skin aging have focused on static conditions. However, in daily life, the facial skin we encounter is constantly in motion due to conversational expressions and changes in facial expressions, causing the skin to alter its position and shape, resulting in a dynamic state. Consequently, it is hypothesized that characteristics of aging not apparent...

article

Diagnostic delay in hidradenitis suppurativa: A systematic review and novel data from a Greek cohort

Aikaterini Tsentemeidou, Efstratios Vakirlis, Katerina Bakirtzi, Themis Chatzi‐Sotiriou, more

Australasian Journal of Dermatology > 65 > 4 > 378 - 380

article

Robust networked $ℒ_{2}$ ‐stable wireless SINR control

Torbjörn Wigren

International Journal of Robust and Nonlinear Control > 34 > 9 > 5833 - 5851

In the new radio wireless system, use cases for automation, automotive safety and virtual reality will require transmission and reception with very high reliability and very low latency. Radio channel fading and the onset of strong interference combine to make this task hard, which require new methods for mitigation. The alternative studied in this article is to introduce fast signal to interference...

article

Reducing the propagation delay of compact block in Bitcoin network

Aeri Kim, Meryam Essaid, Sejin Park, Hongtaek Ju

International Journal of Network Management > 34 > 3 > n/a - n/a

Bitcoin is a Blockchain‐based network in which thousands of nodes are directly connected and communicate via a gossip‐based flooding protocol. Mined blocks are propagated to all participating nodes in the network through a CBR (compact block relay) protocol developed to reduce the block propagation delay. However, propagation delay persists. The relay time between nodes must be measured and analyzed...

article

Tracking, calculating, watching: Governing and delay in the Jakarta Smart City

Sophie Webber, Sophia Maalsen, Leah Emmanuel

Transactions of the Institute of British Geographers > 49 > 2 > n/a - n/a

Jakarta is widely lauded by global consultancies, technology giants and critical scholars as an increasingly important ‘smart’ city. One of the reasons for this is the attempted use by state, corporate and individual actors of smart technologies, discourses and practices to solve the urban challenges of flooding, traffic and waste management in the context of climate change and urbanisation. In this...

article

Representation of solutions and finite‐time stability for fractional delay oscillation difference equations

Yuting Chen

Mathematical Methods in the Applied Sciences > 47 > 6 > 3997 - 4013

In this article, an explicit solution of the homogeneous fractional delay oscillation difference equation of order

1 < ι < 2

is given by constructing discrete sine‐ and cosine‐type delayed Mittag‐Leffler functions. Then, the discrete Laplace transform technique as an effective tool for solving the nonhomogeneous term, which is utilized to explore the solution...

article

Gross motor development in children with epidermolysis bullosa

Andrew Gorrie, Rebecca Saad, Lydia Garside, Claire Bailie, more

Child: Care, Health and Development > 50 > 1 > n/a - n/a

Background Epidermolysis bullosa (EB) is a group of rare, congenital skin disorders, characterized by skin fragility and formation of blisters. The gross motor outcomes of children with EB are not known. Objectives The primary objective of the study was to measure the proportion of gross motor delay in children with EB. The secondary objectives were to measure the difference in gross motor outcomes...

article

Remote ultrasound real‐time consultation and quality control system

Yong Zhang, Yan Luo, Li Qiu, Qiang Lu, more

International Journal of Imaging Systems and Technology > 34 > 1 > n/a - n/a

Ultrasound examination is widely used, but there are problems such as difficulties in quality control and unbalanced distribution of ultrasound resources in primary hospitals. In this article, a novel remote ultrasound real‐time consultation and quality control system was developed. The system uses advanced information science technology, medical image acquisition equipment, audio and video coding...

article

Effective nonlinear predictive and CTC-PID control of rigid manipulators

Piotr Tatjewski

Journal of Automation Mobile Robotics and Intelligent Systems > 2024 > Vol. 18, No. 2 > 1--16

Effective nonlinear control of manipulators with dynamically coupled arms, like those with direct drives, is the subject of the paper. Model-based predictive control (MPC) algorithms with nonlinear state-space models and most recent disturbance attenuation technique are proposed. This technique makes controller design and online calculations simpler, avoiding necessity of dynamic modeling of disturbances...

article

Novel extended mixed controller design for bifurcation control of fractional‐order Myc/E2F/miR‐17‐92 network model concerning delay

Peiluan Li, Xueqing Peng, Changjin Xu, Liqin Han, more

Mathematical Methods in the Applied Sciences > 46 > 18 > 18878 - 18898

MiR‐17‐92 has a vital effect on the adjustment of the Myc/E2F protein in chemistry. In this work, we propose a novel fractional‐order delayed Myc/E2F/miR‐17‐92 network model that revels the relation between miR‐17‐92, E2F, and Myc. Taking advantage of Laplace transform, we obtain the characteristic equation of the established fractional‐order delayed Myc/E2F/miR‐17‐92 network model. By virtue of stability...

article

Reduced access to reinforcement drives delay discounting during experienced delays

Anne C. Macaskill, Kendra Thompson‐Davies, Maree J. Hunt

Journal of the Experimental Analysis of Behavior > 120 > 3 > 416 - 428

Rewards lose value as a function of delay. Previous studies suggest that delays have a bigger effect on reward value when people must wait during the delay. However, whether delays involve waiting or postponing has often been confounded with whether choices are about hypothetical or real rewards. The current study characterized the effects of waiting and postponing in hypothetical and experiential...

article

Results on the existence and approximate controllability of neutral‐type delay integro‐differential system with noninstantaneous impulse

Vandana Yadav, Ramesh Kumar Vats, Ankit Kumar, Kamal Jeet

Mathematical Methods in the Applied Sciences > 46 > 16 > 16992 - 17009

This manuscript aims to establish a new set of sufficient conditions for the existence and approximate controllability of a neutral‐type fractional integro‐differential system employed with noninstantaneous impulse and finite delay in Hilbert space. In order to bring off the main results, the author used fractional calculus, semigroup theory, and Schauder's fixed‐point theorem. At the end, we provide...

article

Timing of antibiotics in febrile children meeting sepsis criteria at a paediatric emergency department

Zondiwe V Mwanza, Brent S White, Philip N Britton, Mary E McCaskill

Emergency Medicine Australasia > 35 > 5 > 855 - 861

Objective Delay in antibiotic administration in paediatric sepsis is associated with increased mortality and prolonged organ dysfunction. This pre‐intervention study evaluated performance in paediatric sepsis management. Methods Retrospective cohort study of febrile children admitted through the ED at The Children's Hospital at Westmead, Sydney, between 1 May and 31 July 2017. Participants were...

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Search results

Dynamical analysis of a stage structured predator–prey system with impulsive diffusion and generic functional response

Thin-Disk Yb:YAG Oscillator-Amplifier Laser, ASE, and Effective Yb:YAG Lifetime

Clinical algorithms for identification and management of delay in the progression of first and second stage of labour

Causes and impact of delays during the COVID‐19 pandemic on head and neck cancer diagnosis

Reconfigured passivity‐based control strategy of LCL‐type grid‐connected inverter under complex grid conditions

Mathematical analysis of stability and Hopf bifurcation in a delayed HIV infection model with saturated immune response

The effect of patient symptom awareness on the visual outcome in retinal detachment

Age‐related changes in cheek skin movement: A case study of Japanese women

Diagnostic delay in hidradenitis suppurativa: A systematic review and novel data from a Greek cohort

Robust networked $ℒ_{2}$ ‐stable wireless SINR control

Reducing the propagation delay of compact block in Bitcoin network

Tracking, calculating, watching: Governing and delay in the Jakarta Smart City

Representation of solutions and finite‐time stability for fractional delay oscillation difference equations

Gross motor development in children with epidermolysis bullosa

Remote ultrasound real‐time consultation and quality control system

Effective nonlinear predictive and CTC-PID control of rigid manipulators

Novel extended mixed controller design for bifurcation control of fractional‐order Myc/E2F/miR‐17‐92 network model concerning delay

Reduced access to reinforcement drives delay discounting during experienced delays

Results on the existence and approximate controllability of neutral‐type delay integro‐differential system with noninstantaneous impulse

Timing of antibiotics in febrile children meeting sepsis criteria at a paediatric emergency department

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