bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of the discharge circuit inductance on the ablative pulsed plasma thruster performance
Authors: Diakonov G A , Lyubinskaya N V , Semenikhin S A 
Published: June 2020

Abstract
The most promising option for motion control of small spacecrafts with weight less than 50 kg is a pulsed plasma thruster with an energy of less than 20 J (micro-PPT), which has such advantages as low weight, structure simplicity, precise pulse control, sufficiently long life time, constant operational readiness and low inertia. It was believed that PPT with low discharge energy (less than 20 J) needed reduction of the initial inductance, despite the fact that the low capacity of the capacitor bank would not allow to achieve the optimal C/Lo ratio. However, the results of calculations and experiments show that a slight increase in the initial inductance of the discharge circuit, contrary to the assumptions, has a positive effect on the micro-PPT characteristics, reducing the propellant consumption and mainly increasing the specific impulse without significant reduction of the thrust impulse (unit impulse). This feature of the discharge circuit of the PPT with a low discharge energy allows us to discover new solutions in micro-PPT designing and improve the thruster specific characteristics.
Comparative analysis of calibration variants for inertial measurement unit based on microelectromechanical system
Authors: Krylov A A , Veremeenko K K 
Published: June 2020

Abstract
This paper is about comparison of two methods of calibration – calibration method for inertial measurement unit with gyroscope and accelerometer direct information outputs and calibration method for strapdown inertial navigation system with coordinate, velocity and orientation outputs. Two mathematical methods - Least Squares and Kalman Filter methods are applied respectively. Both methods assume the same mathematical error model. This model includes zero drift, nonlinearity coefficients, nonorthogonal projections and also noises of these parameters The research compare these methods and make attempt to give approximate numerical results. The results reveal features of each case, e.g. optimal calibration time for Kalman Filter and opportunity to find unknown noise parameters in inertial measurement unit variant. These features can help a researcher to choose a suitable variant, all else being equal it is recommended to use the inertial measurement unit variant.
Consideration of aeroservoelasticity requirements in the development of highly maneuverable unmanned aerial vehicle
Authors: Parafes’ S , Turkin I 
Published: June 2020

Abstract
An approach to the joint design construction and stabilization system of the highly maneuverable unmanned aerial vehicle account with requirements of aeroservoelacticity, the most important of which is to prevent self-oscillations in the unmanned aerial vehicle stabilization loop. The approach includes three stages. The first stage is the preliminary choice of structure and basic parameters of the unmanned aerial vehicle stabilization loop account with aeroservoelacticity requirements. The second stage is the separate design of subsystems (airframe, stabilization system) by traditional methods in compliance with the requirements formulated at the first stage. The goals to be achieved at this stage are to obtain a rational (from the standpoint of mass and technological perfection) design of the unmanned aerial vehicle airframe, and a stabilization system that provides the required dynamics and the accuracy of execution of commands, as well as the minimum cost, dimensions and weight. The third stage is the coordination of the selected structure and design parameters of the airframe and stabilization system, aimed at meeting the aeroservoelasticity requirements (the authors use the model of the unmanned aerial vehicle stabilization loop stability study, reflecting the specifics of the classes of highly maneuverable aircraft). An example of the process of developing the highly maneuverable unmanned aerial vehicle account with aeroservoelacticity requirements is given.
A parametric analysis of the output voltage of all-vanadium redox-flow battery system
Authors: Al-Yasiri M A 
Published: June 2020

Abstract
Vanadium redox flow battery (VRFB) becomes a global technology used in stationary applications like grid storage. The characteristics of output voltage during the charge-discharge cycles and the resulted power of VRFB are strongly based on solving a multidisciplinary problem. In this paper, a 2 D steady state numerical model for the operation of a single VRFB has been formulated, validated with good agreement, and tested. The output voltage response of VRFB at different state of charges (SOCs) has been investigated under range of volumetric flow rates and current densities. Next, a comprehensive parametric analysis, sensitivity study, for the major electrode and electrolyte material properties is conducted which can improve confidence in model predictions. The results showed that increasing flow rate can help to minimize concentration polarization, however, pumping power would be dominated. A low flow rate can cause some poor covered regions, but would reduce pumping power. Based on the sensitivity results, only cathode reaction rate, specific surface area, conductivity of porous electrode and electrolyte, and carbon felt porosity are input parameters that dominate the simulation results. It is expected that this proposed model would be applicable to most flow batteries architectures and can be extended to stack flow batteries.
Identifying the nutritional composition of fish waste, bones, scales, and fins
Authors: Maktoof Afrah A. , Elherarlla Roaa Jafar , Ethaib Saleem 
Published: June 2020

Abstract
Extraction valuable products from fish waste such as protein, lipid has gained more research attention around the worldwide. In this study, a fish waste was subjected to approximate analysis to determine the nutritional composition includes protein, lipid, and carbohydrates as well as moisture and ash content. The fish waste included scales, fins, and bones isolated from Cyprinus carpi fish samples. The fish samples were divided into three samples groups and named G1, G2, and G3.The results showed high protein content in fish waste and the highest value 27.3 % found in bones (G3). The highest value of lipid content also was recorded in bones 7%. The higher moisture content was detected in scales parts 73% accompanied with a significant difference (P-value <0.05) in the scales moisture contents among the three fish waste groups. In addition the results revealed that the protein and lipid content increased with increasing weight and size of fish. In general, this study presents a high nutritional value of fish waste, providing another a viable source for sustainable food industry.
Photocatalytic removal of eosin dye from aqueous solution over titanium dioxide
Authors: Al-Gubury Hazim Y , Saad Suad T , Alrazzak Nour Abd , Naif Ruqaia M 
Published: June 2020

AbstractA Various concentrations of Eosin dye were irradiated using titanium dioxide as a catalyst. The irradiation was carried out using the catalyst (0.1gm/100ml), mercury lamp 125 Watts from external source and at Rt. The effect of TiO2on the photocatalytic degradation of Eosin was studied in various conditions such as, studying the effect of loaded mass of titanium dioxide, effect of eosin dye concentration and effect of inorganic anions.
“Impact of culvature and magnetic force on waveform transition of Pseudo plastic fluid in flexible channel”
Authors: Alshareef T Sh 
Published: June 2020

Abstract
Waveform transport of Pseudo plastic fluid in complaint symmetric channel with culvature properties has designed. The efforts of magnetic force, which has applied by radiate direction in the analysis, is considered by using the influence of Hartmann number. Walls properties with slip conditions on velocity distribution as well as stream function are used. The analysis of" heat and mass transfer" has taken into account. More popularized factual constraints known by the convective conditions are applied. The partial differential equations of motion, temperature and concentration is reduced under the simulation of low quantity of wave number and Reynolds number and then transformed to ordinary differential equation of independent variable of radial coordinate (η). The result equations are solved by using homotopy analysis. Impacts of sundry variables on the axial velocity, trapped bolus, temperature and concentration has examined. It is found that velocity is a decrescent function for Hartmann number (Ha) and it‘s curve is not symmetric for small values of culvature and the case is opposite for large values of it. Also we found that the temperature is an growing function of Brinkman number while the concentration is a decreasing function of soret and Schmidt numbers. Influences of most variables are supported by graphs. The numerical and figures are obtained by using the software of Mathematica program.
On Bayesian Estimation of System Reliability in Stress – Strength Model Based on Generalized Inverse Rayleigh Distribution
Authors: Jebur Iman Ghaji , Kalaf Bayda Atiya , Salman Abbas N. 
Published: June 2020

Abstract
The parameter and system reliability in stress-strength model are estimated in this paper when the system contains several parallel components that have strengths subjects to common stress in case when the stress and strengths follow Generalized Inverse Rayleigh distribution by using different Bayesian estimation methods. Monte Carlo simulation introduced to compare among the proposal methods based on the Mean squared Error criteria.
Pu-visible Submodule with their most prominent characteristics
Authors: Al-Quraishi Abass D. , Shihab Buthyna N. 
Published: June 2020

Abstract
In this article, the concept of pu-visible submodules of an S-module Y is introduced which is a generalization of the concept of visible submodule. Some charactrizations and properties are proven. Also the results of pu-visible submodule by a module Y will by presented by giving many results and properties that explain and discuss that concept, one of the most important of them show that the submodule of Y is pu-visible when the residual of it is pu-visible ideal of S and the opposite is achieved. In addition to many results that have been presented.
Growth and Bounded Solution of Second-Order of Complex Differential Equations Through of Coefficient Function
Authors: Saleh Haneen Abbas , Alhily Shatha S. 
Published: June 2020

Abstract
The purpose of this research paper, is to present the second- order homogeneous complex differential equation f" + H(z)f = 0, which defined on the disk D = {z ∈ ℂ : |z − i| ≤ 1} ⊆ ℂ, where H(z) = e

p(z), to show it an invariant by applying Liouville and self-adjoint transformation with an examine the convexity property of its coefficient H(z) = e

p(z), in order to study the growing and bounded solution of consider equation.
Disruption and Compensation of Sulcation-based Covariance Networks in Neonatal Brain Growth after Perinatal Injury
Authors: Kim Sharon Y , Liu Mengting , Hong Seok-Jun , Toga Arthur W , Barkovich A James , Xu Duan , Kim Hosung 
Published: June 2020

AbstractPerinatal brain injuries in preterm neonates are associated with alterations in structural neurodevelopment, leading to impaired cognition, motor coordination, and behavior. However, it remains unknown how such injuries affect postnatal cortical folding and structural covariance networks, which indicate functional parcellation and reciprocal brain connectivity. Studying 229 magnetic resonance scans from 158 preterm neonates (n = 158, mean age = 28.2), we found that severe injuries including intraventricular hemorrhage, periventricular leukomalacia, and ventriculomegaly lead to significantly reduced cortical folding and increased covariance (hyper-covariance) in only the early (&lt;31 weeks) but not middle (31–35 weeks) or late stage (&gt;35 weeks) of the third trimester. The aberrant hyper-covariance may drive acceleration of cortical folding as a compensatory mechanism to “catch-up” with normal development. By 40 weeks, preterm neonates with/without severe brain injuries exhibited no difference in cortical folding and covariance compared with healthy term neonates. However, graph theory-based analysis showed that even after recovery, severely injured brains exhibit a more segregated, less integrated, and overall inefficient network system with reduced integration strength in the dorsal attention, frontoparietal, limbic, and visual network systems. Ultimately, severe perinatal injuries cause network-level deviations that persist until the late stage of the third trimester and may contribute to neurofunctional impairment.
P473Safety and efficacy of direct oral anticoagulants compared to vitamin K antagonists in patients with atrial fibrillation undergoing percutaneous coronary interventions: A meta-analysis
Authors: Agasthi P , Lee J Z , Pujari S H , Tseng A S , Shipman J , Almader-Douglas D , Ashraf H , Mookadam F , Fortuin F D , Beohar N , Arsanjani R , Mulpuru S K 
Published: June 2020

Abstract

Background
Coronary artery disease (CAD) and atrial fibrillation (AF) are commonly associated. Co-treatment with multiple anti-thrombotic agents can increase the risk of bleeding.

Purpose
We sought to evaluate patient-centered outcomes in patients with AF on double therapy with direct oral anticoagulants (DOACs) compared to patients with standard triple therapy, [a vitamin K antagonist (VKA) plus dual antiplatelet therapy].

Methods
We performed an extensive systematic review of the literature and meta-analysis of randomized controlled trials reporting outcomes of patients receiving double therapy with DOACs compared to triple therapy with VKAs in patients with AF undergoing percutaneous coronary intervention (PCI). Patient-centered outcomes were the International Society of Thrombosis and Hemostasis (ISTH) major or clinically relevant non-major bleeding (CRNB), all-cause mortality, major adverse cardiovascular events (MACE), myocardial infarction, stent thrombosis, and stroke.

Results
Four randomized controlled trials (9602 patients) met our inclusion criteria. Compared to VKAs, DOACs were associated with significantly lower ISTH major bleeding/ CRNB (RR - 0.75, 95% CI: 0.67-0.82, p &lt; 0.00001, I2 = 11%). There were no statistically significant differences in the efficacy outcomes, including myocardial infarction (RR- 0.99, 95% CI :0.79-1.25, p = 0.96, I2 = 0%), stent thrombosis (RR - 0.97, 95% CI: 0.6-1.55, p = 0.89, I2 = 0%), ischemic stroke (RR - 0.76, 95% CI: 0.5-1.15, p = 0.19, I2 = 0%), all-cause mortality (RR - 1.06, 95% CI: 0.85-1.31, p = 0.61, I2 = 0%) and MACE (RR - 1.06, 95% CI: 0.91-1.22, p = 0.97, I2 = 0%).

Conclusion
Compared with triple therapy with VKAS, double therapy with DOACs is associated with a reduced risk of bleeding and is as effective in patients with AF undergoing PCI.
Abstract Figure.
1260Transvenous lead extraction: efficacy and safety of the procedure in octogenarian patients
Authors: Giannotti Santoro M , Segreti L , Zucchelli G , Barletta V , Fiorentini F , Di Cori A , Della Tommasina V , De Lucia R , Bongiorni M G 
Published: June 2020

Abstract

Introduction
the management of patients with infection or malfunction of a cardiac implantable electronic device (CIED) may be challenging.

Purpose
The aim of the study is to evaluate the safety and efficacy of transvenous lead extraction (TLE) in elderly patients.

Methods
a retrospective analysis of patients who underwent to TLE in our center was performed. Patients were divided in two groups: 1) patients 80 years of age or older, 2) patients younger than 80 years. All patients were treated with manual traction or mechanical dilatation.

Results
our analysis included 1316 patients, with a total of 2513 leads extracted. Group 1 (≥80 years) counted 202 patients and group 2 (&lt;80 years) 1114 patients. The group of elderly patients presented more comorbidities, as hypertension, chronic kidney disease, atrial fibrillation and pulmonary disease. Patients 80 years of age or older had more pacemakers than ICDs, whereas the dwelling time of the oldest lead, the number of leads and the presence of abandoned leads was similar despite patients age. In group 1 the rate of radiological success for lead was higher than in group 2 (99.0% vs 95.9%; P &lt; 0.001). The clinical success was obtained in 1273 patients (96.7%), without significative differences between groups (98.0% vs 96.4%; P = 0.36). Major complications occurred in 10 patients (0.7%), without significative differences (1.5% vs 0.6%; P = 0.24) (figure 1).

Conclusion
TLE in elderly patients is a safe and effective procedure. In patients older than 80 years there are not more major complications than in younger patients, and the efficacy of the procedure seems to be superior.
Abstract Figure 1
P351Therapeutic inefficacy and pro-arrhythmic nature of metoprolol succinate and carvedilol therapy in patients with idiopathic, frequent, monomorphic premature ventricular contractions
Authors: Turan O E , Hasdemir C 
Published: June 2020

Abstract

Funding Acknowledgements
None

Background
Anti-arrhythmic drugs remain the first-line therapy for treatment of idiopathic ventricular arrhythmias in clinical practice.

Purpose
The aim of this study was to assess the therapeutic efficacy of extended-release metoprolol succinate (MetS) and carvedilol for idiopathic, frequent, monomorphic premature ventricular contractions (PVCs).

Methods
Study population consisted of 115 consecutive patients: 72 received MetS and 43 received carvedilol. All patients underwent 24-hour Holter monitoring at baseline and during drug therapy. PVC burden response to drug therapy was categorized as "Good" (≥80% reduction), "Poor" (either &lt; 80% reduction or ≤ 50% increase) and "Pro-arrhythmic" response (&gt; 50% increase) based on change in PVC burden compared to baseline.

Results
Presenting symptoms were palpitations in 69 (60%), shortness of breath/chest pain/syncope in 12 (10.5%), and coincidentally discovered in 34 (29.5%) patients. Mean MetS and carvedilol dosages were 65.57 ± 30.67 mg/day and 23.66 ± 4.26 mg/day, respectively. "Good", "Poor" and "Pro-arrhythmic" response was observed in 13.9% and 23.3%, 61.1% and 60.5%, and 25% and 16.2% of patients treated with MetS and carvedilol, respectively. In patients with relatively high (≥16%) PVC burden, "Poor" response was observed in 86.9% and 76% of patients treated with MetS and carvedilol, respectively. Side-effects and/or intolerance were observed in 5.5 % and 13.9 % of patients treated with MetS and carvedilol, respectively.

Conclusions
MetS and carvedilol for idiopathic, frequent, monomorphic PVCs is frequently inefficient. Therapeutic efficacy decreases further in patients with relatively high (≥16%) PVC burden. "Pro-arrhythmic" response was observed in approximately one quarter of the patients.
All patients Metoprolol Succinate (n = 71) Carvedilol (n = 43) p value Good response,n (%) 7 (9.9) 7 (16.3) 0.38 Poor response,n (%) 46 (64.8) 29 (67.4) 0.38 Pro-arrhythmic response,n (%) 18 (25.4) 7 (16.3) 0.38 Patients with PVC burden≥%16 Metoprolol Succinate (n = 22) Carvedilol (n = 25) Good response,n (%) 1 (4.5) 3 (12) 0.56 Poor response,n (%) 20 (91) 20 (80) 0.56 Pro-arrhythmic response,n (%) 1 (4.5) 2 (8) 0.56 Therapeutic response to Metoprolol Succinate and Carvedilol
P1487Cardiac resynchronization through His bundle pacing in patients with heart failure
Authors: Moraleda Salas M T , Sigismondi A , Arce Leon A , Fernandez Gomez J M , Manovel Sanchez A , Venegas Gamero J , Morina Vazquez P 
Published: June 2020

Abstract

Introduction and purpose
Permanent His bundle pacing (p-HBP) can correct intraventricular conduction disorders and could be a physiological alternative for traditional cardiac resynchronization therapy (CRT) via the coronary sinus: our aim was to describe our results in patients with heart failure and ventricular dysfunction who were resynchronized by p-HBP.

Methods
Prospective descriptive study of patients with CRT indication and who were resynchronized by p-HBP, using the specific tools. The correction of bundle branch block (BBB) by His bundle pacing (HBP) has been previously checked. We analyzed: the global success of the implant, the His thresholds, and the improvement in left ventricular ejection fraction (LVEF) at one month of follow-up.

Results
We included 54 patients (median age 66 (56-72)) with an indication for CRT: 89% (n = 48) with heart failure (HF), left bundle block branch (LBBB) and LVEF &lt;35%; 3% (n = 2) with HF, right bundle block branch (RBBB) and LVEF &lt;35%; 2% (n = 1) with permanent pacemaker, ventricular dysfunction and ventricular pacing &gt;40%; and 6 % (n = 3) with complete AV block, LBBB and ventricular dysfunction. With HBP we corrected the BBB in 83% of patients (n = 45), and we achieved cardiac resynchronization through p-HBP in 93% of this patients (n = 42), with a global success (including those in whom HBP did not correct the BBB) of 78% (n = 42).
The basal QRS was 160 ms (151-162) and the paced QRS was 132 ms (125-145). The median of His acute threshold was 1.6 volts (0.9-1.9), stable at one month of follow-up, excluding one patient whose His threshold progressively increased to 5.5 volts. There was no dislocation of leads in the follow-up. LVEF improved in all patients: basal 30% (27-35) and at one month follow-up 52% (48-64). Median fluoroscopy times of device implantation including the time taken for temporary HBP were 8.1 minutes (range 6.1-9.9). There were no relevant complications during the implant or follow-up; all patients showed clinical subjective improvement.

Conclusions
CRT by p-HBP is feasible and safe in a high percentage of patients, with reasonable times of fluoroscopy, acceptable capture thresholds, and an early improvement in LVEF in patients with HF and an indication for CRT.