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Guang Yue, Jun Wang, Huaying Li, Biao Li, Rong Ju Neonatal Department, Chengdu Women’s and Children’s Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, People’s Republic of ChinaCorrespondence: Rong Ju Tel +86-13699003629Email jurong@uestc.edu.cnBackground: The purpose of this study was to identify the risk factors for premature neonates requiring mechanical ventilation.Methods: Premature neonates admitted to Chengdu Women’s and Children’s Central Hospital between July 2014 and December 2020 were retrospectively included in this study. Clinical and demographic factors were collated. Univariate and multivariate logistic regression analyses were conducted to identify the risk factors for premature infants requiring mechanical ventilation.Results: A total of 1262 premature neonates participated in the study. Among them, 423 (33.53%) neonates required mechanical ventilation, whereas 839 (66.48%) neonates did not require mechanical ventilation. Multivariate logistic regression analysis determined that a lower Apgar score at 5 min (OR = 0.595, 95% CI: 0.472– 0.74; P < 0.001), lower gestational age (very preterm) (OR = 11.745, 95% CI: 4.362, 31.619, P < 0.001), lower systolic blood pressure (OR = 0.864, 95% CI: 0.812– 0.917, P = 0.001), lower diastolic blood pressure (OR = 0.894, 95% CI: 0.831– 0.96, P = 0.002), higher respiratory rate (OR = 1.292, 95% CI: 1.238– 1.355, P < 0.001), increased C-reactive protein levels (OR=1.044, 95% CI: 1.003– 1.086, P = 0.036), and presence of patent ductus arteriosus (OR = 2.174, 95% CI: 1.185– 3.972, P = 0.012) were independently associated with an increased possibility of adopting mechanical ventilation in premature infants. ROC analysis demonstrated that the predicted power for premature neonates requiring mechanical ventilation was 0.855 (95% CI: 0.808– 0.902, P < 0.001).Conclusion: In conclusion, we determined that a lower Apgar score at 5 min

This work demonstrates that a free -running Fabry-Perot quantum dot laser generates chaotic oscillations without any external perturbations, which is owing to the multimode Risken-Nummerdal-Graham-Haken instability. (0 2020 The Authors

This work demonstrates that a free -running Fabry-Perot quantum dot laser generates chaotic oscillations without any external perturbations, which is owing to the multimode Risken-Nummerdal-Graham-Haken instability. (0 2020 The Authors

Back injuries are the most prevalent work-related musculoskeletal disorders and represent a major cause of disability. Although innovations in wearable robots aim to alleviate this hazard, the majority of existing exoskeletons are obtrusive because the rigid linkage design limits natural movement, thus causing ergonomic risk. Moreover, these existing systems are typically only suitable for one type of movement assistance, not ubiquitous for a wide variety of activities. To fill in this gap, this paper presents a new wearable robot design approach continuum soft exoskeleton. This spine-inspired wearable robot is unobtrusive and assists both squat and stoops while not impeding walking motion. To tackle the challenge of the unique anatomy of spine that is inappropriate to be simplified as a single degree of freedom joint, our robot is conformal to human anatomy and it can reduce multiple types of forces along the human spine such as the spinae muscle force, shear, and compression force of the lumbar vertebrae. We derived kinematics and kinetics models of this mechanism and established an analytical biomechanics model of human-robot interaction. Quantitative analysis of disc compression force, disc shear force and muscle force was performed in simulation. We further developed a virtual impedance control strategy to deliver force control and compensate hysteresis of Bowden cable transmission. The feasibility of the prototype was experimentally tested on three healthy subjects. The root mean square error of force tracking is 6.63 N (3.3 % of the 200N peak force) and it demonstrated that it can actively control the stiffness to the desired value. This continuum soft exoskeleton represents a feasible solution with the potential to reduce back pain for multiple activities and multiple forces along the human spine., Comment: 8 pages, 13 figures

Nearly one million Americans suffer from chronic fatigue syndrome (CFS). More than 15% of Gulf War veterans (GWV) were found to have CFS. The disease significantly reduces work production of civilian patients and combat ability/readiness of US military forces. Increasing scientific evidence suggests that CFS is a biological illness involving pathology of the central nervous system (CNS). However, little is known about how the CNS is affected by CFS. This study will focus on evaluating brain activities of CFS patients during fatigue and non-fatigue muscle exercises. Our hypothesis is that the brain activation pattern in CFS differs from that of healthy controls. Aim 1 of the study is to determine brain activation patterns during motor activity in CFS patients using functional magnetic resonance imaging. Aim 2 is to examine brain activation patterns during motor activity in CFS patients by analyzing signals of electroencephalograms. Aim 3 is to evaluate signal relationships among different brain regions and between the brain and muscle. Measurements will be made from four groups of participants: a civilian CFS group, a civilian control group, a GWV

Slurry pipelines are particularly competitive when downstream processing results in a slurry and requires a particle size suitable for pipeline transport; the economics improve as distance and volume increase. Costs for a proposed pipeline system in Florida are compared with trucking costs and found to be around US, Slurry pipelines are particularly competitive when downstream processing results in a slurry and requires a particle size suitable for pipeline transport; the economics improve as distance and volume increase. Costs for a proposed pipeline system in Florida are compared with trucking costs and found to be around US

Ultrafine Cu powder with an average size of less than 10 micrometers was produced from Cu concentrate as raw material in a slurry electrolysis cell under an ultrasonic field following mechanical activation pretreatment. The particle size of the powder decreased and the specific surface area increased with increasing current density. The particle size decreased and the surface area increased in the presence of an ultrasonic field compared with results obtained in the absence of the field. Prolonged ultrasonic treatment resulted in a further particle size reduction and specific surface area increase., Ultrafine Cu powder with an average size of less than 10 micrometers was produced from Cu concentrate as raw material in a slurry electrolysis cell under an ultrasonic field following mechanical activation pretreatment. The particle size of the powder decreased and the specific surface area increased with increasing current density. The particle size decreased and the surface area increased in the presence of an ultrasonic field compared with results obtained in the absence of the field. Prolonged ultrasonic treatment resulted in a further particle size reduction and specific surface area increase.

This paper describes how ground-surface movement and deformation in underground solution mining can be calculated and predicted by the probability integration method. Some of the parameters in the calculation can be simulated and other can be measured in situ., This paper describes how ground-surface movement and deformation in underground solution mining can be calculated and predicted by the probability integration method. Some of the parameters in the calculation can be simulated and other can be measured in situ.