The ground state of the lithium atom in dense plasmas using variational Monte Carlo method

xlomafota.13 shared this article with you from Inoreader The ground state of the lithium atom in dense plasmas using variational Monte Carlo method Via Latest Results for Indian Journal of Physics Abstract In this paper, the variational quantum Monte Carlo method is applied to investigate the ground state of the lithium atom. Moreover, the energy eigenvalues of the lithium atom in dense plasma are also investigated by using the Debye–Hückel model and the exponential cosine screened Coulomb potential model. The calculations are carried out by using trial wave functions in the form of the Slater determinant wave function multiplied by a correlation function due to the interaction between the electrons. Three types of correlation functions are used—with two, three and four variational parameters—one of which satisfies the well-known cusp conditions. Interesting results are obtained in comparison with results obtained by using other trial wave functions. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Validation of novel patient-centred juvenile idiopathic arthritis-specific patient-reported outcome and experience measures (PROMs/PREMs)

xlomafota.13 shared this article with you from Inoreader Validation of novel patient-centred juvenile idiopathic arthritis-specific patient-reported outcome and experience measures (PROMs/PREMs) Via Latest Results for Pediatric Rheumatology Abstract Background Measuring the outcomes that matter to children and young people (CYP) with juvenile idiopathic arthritis (JIA), is a necessary precursor to patient-centred improvements in quality of clinical care. We present a two-centre validation of novel JIA patient-reported outcome and experience measures (PROM and PREM) developed as part of the CAPTURE-JIA project. Methods CYP with JIA were recruited from paediatric rheumatology clinics, completing the CAPTURE-JIA PROM and PREM, CHAQ and CHU 9D. A subset participated in face-to-face interviews and completed the PROM/PREM 1 week later. The OMERACT filter was applied and the three domains of validation assessed. Truth assessments included cognitive interviewing, sensitivity analysis and Spearman's correlations. Discrimination assessments included specificity and reliability testing. Feasibility was assessed using time to form completion and proportion of missing data. Results Eighty-two CYP and their families were recruited; ten cognitive interviews and fifteen PROM/PREM test/retests were conducted. Truth: CYP and parents understood the PROM/PREM and felt important areas were covered. PROM criteria had high sensitivities (> 70%) against similar items on the CHU 9D, with the exception of fatigue (58%). Correlations between similar PROM and CHU 9D criteria were moderate to very strong (coefficients 0.40–0.82.) Discrimination: high specificities (> 70%) on corresponding PROM and CHU 9D domains. Feasibility: median completion times for PROM 60 s (IQR 38–75) and PREM 49 s (IQR 30–60) respectively. Conclusion The CAPTURE-JIA PROM and PREM are valid and feasible in UK paediatric rheumatology clinics. Embedding routine collection into clinical care would be a major step towards improving quality of care. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

EndoPil: A Magnetically Actuated Swallowable Capsule for Weight Management: Development and Trials

xlomafota.13 shared this article with you from Inoreader EndoPil: A Magnetically Actuated Swallowable Capsule for Weight Management: Development and Trials Via Latest Results for Annals of Biomedical Engineering Abstract Intragastric balloons (IGBs), by occupying the stomach space and prolonging satiety, is a promising method to treat obesity and consequently improves its associated comorbidities, e.g. coronary heart disease, diabetes, and cancer. However, existing IGBs are often tethered with tubes for gas or liquid delivery or require endoscopic assistance for device delivery or removal, which are usually uncomfortable, costly, and may cause complications. This paper presents a novel tetherless, magnetically actuated capsule (EndoPil) which can deploy an IGB inside the stomach after being swallowed and being activated by an external magnet. The external magnet attracts a small magnet inside the EndoPil to open a valve, triggering the chemical reaction of citric acid and potassium bicarbonate to produce carbon dioxide gas, which inflates a biocompatible balloon (around 120 mL). A prototype, 13 mm in diameter and 35 mm in length, was developed. Simulations and bench-top tests wer e conducted to test the force capability of the magnetic actuation mechanism, the required force to activate the valve, and the repeatability of balloon inflation. Experiments on animal and human were successfully conducted to demonstrate the safety and feasibility of inflating a balloon inside the stomach by an external magnet. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Neck Muscle and Head/Neck Kinematic Responses While Bracing Against the Steering Wheel During Front and Rear Impacts

xlomafota.13 shared this article with you from Inoreader Neck Muscle and Head/Neck Kinematic Responses While Bracing Against the Steering Wheel During Front and Rear Impacts Via Latest Results for Annals of Biomedical Engineering Abstract Drivers often react to an impending collision by bracing against the steering wheel. The goal of the present study was to quantify the effect of bracing on neck muscle activity and head/torso kinematics during low-speed front and rear impacts. Eleven seated subjects (3F, 8 M) experienced multiple sled impacts (Δv = 0.77 m/s; apeak = 19.9 m/s2, Δt = 65.5 ms) with their hands on the steering wheel in two conditions: relaxed and braced against the steering wheel. Electromyographic activity in eight neck muscles (sternohyoid, sternocleidomastoid, splenius capitis, semispinalis capitis, semispinalis cervicis, multifidus, levator scapulae, and trapezius) was recorded unilaterally with indwelling electrodes and normalized by maximum voluntary contraction (MVC) levels. Head and torso kinematics (linear acceleration, angular velocity, angular rotation, and retraction) were measured with sen sors and motion tracking. Muscle and kinematic variables were compared between the relaxed and braced conditions using linear mixed models. We found that pre-impact bracing generated only small increases in the pre-impact muscle activity (< 5% MVC) when compared to the relaxed condition. Pre-impact bracing did not increase peak neck muscle responses during the impacts; instead it reduced peak trapezius and multifidus muscle activity by about half during front impacts. Bracing led to widespread changes in the peak amplitude and timing of the torso and head kinematics that were not consistent with a simple stiffening of the head/neck/torso system. Instead pre-impact bracing served to couple the torso more rigidly to the seat while not necessarily coupling the head more rigidly to the torso. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Efficacy of Liraglutide to Prevent Weight Regain After Retrieval of an Adjustable Intra-gastric Balloon—a Case-Matched Study

xlomafota.13 shared this article with you from Inoreader Efficacy of Liraglutide to Prevent Weight Regain After Retrieval of an Adjustable Intra-gastric Balloon—a Case-Matched Study Via Latest Results for Obesity Surgery Abstract Purpose Weight regain after balloon retrieval is a concern with all intra-gastric balloons (IGBs). The aim of this study was to evaluate the efficacy of liraglutide, a glucagon-like peptide-1 (GLP-1) agonist, to prevent weight regain following IGB retrieval. Materials and Methods This was a case-matched study of patients undergoing Spatz3 adjustable IGB (Spatz FGIA, Inc. NY, USA) at three outpatient clinics in Brazil between November 2015 and January 2019. Seventy-seven patients that opted to take liraglutide following IGB retrieval (IGB-L) were matched 1:1 to 198 patients that declined the medication—IGB-Alone (IGB-A). Propensity score adjustment was performed at the time of balloon retrieval on factors known to influence the choice of liraglutide. Weight and percent body fat (%BF) was measured at baseline and 9 months after IGB retrieval. % BF is defined as the total mass of fat divided by total body mass, multiplied by 100. The primary outcome was weight regain, and the secondary outcome was change in %BF 9 months after IGB retrieval. Results Propensity score matching yielded 53 matched pairs. Weight regain to the starting point was not observed in either group. There was significantly less weight regain in IGB-L compared to IGB-A, − 1.15 ± 0.94 kg versus − 0.66 ± 0.99 kg (p = 0.010) 9 months after balloon retrieval. Additionally, %BF decline in IGB-L was superior to IGB-A − 10.83 ± 1.50 versus − 7.94 ± 2.02 (p < 0.01). There was no difference in weight regain or decline in %BF based on liraglutide dose. Conclusion Liraglutide has an additive benefit with respect to efficacy and a reduction in body fat when commenced after IGB retrieval. Future randomized control studies will be needed to determine the optimal dose and duration of liraglutide to achieve superior outcomes. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Modeling of Virtual Mechanical Circulatory Hemodynamics for Biventricular Heart Failure Support

xlomafota.13 shared this article with you from Inoreader Modeling of Virtual Mechanical Circulatory Hemodynamics for Biventricular Heart Failure Support Via Latest Results for Cardiovascular Engineering and Technology Abstract Objective In this study, a mechanical circulatory support simulation tool was used to investigate the application of a unique device with two centrifugal pumps and one motor for the biventricular assist device (BVAD) support application. Several conditions—including a range of combined left and right systolic heart failure severities, aortic and pulmonary valve regurgitation, and combinations of high and low systemic and pulmonary vascular resistances—were considered in the simulation matrix. Relative advantages and limitations of using the device in BVAD applications are discussed. Methods The simulated BVAD pump was based on the Cleveland Clinic pediatric continuous-flow total artificial heart (P-CFTAH), which is currently under development. Different combined disease states (n = 10) were evaluated to model the interaction with the BVAD, considering combinations of normal heart, moderate failure and severe systolic failure of the left and right ventricles, regurgitation of the aortic and pulmonary valves and combinations of vascular resistance. The virtual mock loop simulation tool (MATLAB; MathWorks®, Natick, MA) simulates the hemodynamics at the pump ports using a lumped-parameter model for systemic/pulmonary circulation characteristic inputs (values for impedance, systolic and diastolic ventricular compliance, beat rate, and blood volume), and characteristics of the cardiac chambers and valves. Results Simulation results showed that this single-pump BVAD can provide regulated support of up to 5 L/min over a range of combined heart failure states and is suitable for smaller adult and pediatric support. However, good self-regulation of the atrial pressure difference was not maintained with the introduction of aortic valve regurgitation or high systemic vascular resistance when combined with low pulmonary vascular resistance. Conclusions This initial in silico study demonstrated that use of the P-CFTAH as a BVAD supports cardiac output and arterial pressure in biventricular heart failure conditions. A similar but larger device would be required for a large adult patient who needs more than 5 L/min of support. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Urea entrapment in cellulose acetate microparticles obtained by electrospraying

xlomafota.13 shared this article with you from Inoreader Urea entrapment in cellulose acetate microparticles obtained by electrospraying Via Latest Results for Journal of Polymer Research Abstract Urea is a widely used source of nitrogen, but its rapid solubilization in water leads to significant wastage on application. Thus, the quest for an efficient and economical polymeric matrix able to encapsulated urea is a long-standing challenge. In this paper, we present a simple and economical method for urea entrapment in cellulose acetate (CA) microparticles produced by the electrospraying process. The morphology and diameter of the microparticles were optimized experimentally by evaluating the solvent composition (binary mixture) and polymer concentration. The electrospraying process parameters, such as particle collection distance, applied voltage and flow rate, were also evaluated. The particle diameter was determined by scanning electron microscopy (SEM) and the CA microparticle characteristics, urea incorporation and in vitro release profile were determined by Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetr y (DSC). The morphological characteristics (shape and porosity) of the CA microparticles were affected by the diffusion rate and CA solubility due to solvent evaporation in the electrospraying process. The SEM images showed monodispersed and spherical CA microparticles with a diameter size of 2.2 ± 0.3 µm. The FTIR spectra and SEM images verified the urea entrapment in the CA microparticles (100 mg/g), and the particle morphology did not appear to be affected. The release of urea from the CA microparticles showed a maximum of 79% after 7 h, which is a significant difference in relation to in vitro urea release. The results obtained using the electrospray technology represent a step forward in the search to improve the incorporation of urea into CA microparticles. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.