bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of Tourniquet Strategy on Perioperative Results of Modern TKA
Authors: Rames Richard D. , Haynes Jacob , Hellman Michael , Barrack Toby , Barrack Robert 
Published: May 2019

AbstractRecent changes in perioperative management of total knee patients including tranexamic acid, multimodal pain management, and periarticular injection make previous data on tourniquet use during total knee arthroplasty (TKA) less relevant. The purpose of this study was to evaluate the effect of tourniquet use on short-term postoperative outcomes in the era of modern TKA. Our institutional database was utilized to retrospectively identify three cohorts (long, short, and no tourniquet) of consecutive patients after unilateral TKA with a single surgeon. These three groups were compared using analysis of variance (ANOVA) and post hoc Tukey's tests. Primary endpoints being hemoglobin index (difference in preoperative and postoperative hemoglobin), inpatient narcotic use, surgical time, length of hospital stay (total hours and % day1 discharges), and distance ambulated prior to discharge. The no-tourniquet group used significantly less narcotic than the short-tourniquet (2.4 vs. 2.9 morphine equivalent/hour, p = 0.004) and long-tourniquet groups (2.4 vs. 3.4 morphine equivalents/hour, p < 0.001). The no-tourniquet group ambulated significantly further than patients in the short (108 vs. 57 feet, p < 0.001) and long (108 vs. 76 feet, p < 0.001) groups. Finally, the no-tourniquet group had significantly shorter duration of hospitalization than the long-tourniquet group in both hours in the hospital (35 vs. 57 hours, p < 0.001) and % postoperative day 1 discharge (57 vs. 12%, p < 0.001). TKA without the use of a tourniquet is associated with less narcotic consumption and increased distance ambulated prior to discharge compared with cohorts of patients utilizing tourniquet for a short or long duration.
Barbed Sutures in Total Knee Arthroplasty: Are They Really Useful? A Randomized Controlled Trial
Authors: Gamba Carlo , Hinarejos Pedro , Serrano-Chinchilla Paula , Leal-Blanquet Joan , Torres-Claramunt Raul , Sánchez-Soler Juan , Monllau Joan Carles 
Published: May 2019

AbstractBidirectional barbed sutures (BBSs) have recently been investigated in total knee arthroplasty (TKA). The contrasting results from the scarce literature suggest that BBSs are safe, save time and money, and give results comparable to traditional sutures. The purpose of the study is to test the real effect of BBSs on closure time in TKA and assess the functional results as well as the complications related to them. It was a randomized controlled trial. Eighty-five patients undergoing primary TKA were assigned to receive traditional closure with Vicryl (V-group) or with BBSs (Q-group). The exclusion criteria were significant coronal deformity, flexion contracture, or the need for stem and/or augmentation. The closure time for the capsule and that for the subcutaneous layer were registered separately. Intraoperative incidences were recorded. The follow-up was up to 1 month, during which the range of motion (ROM), superficial or deep infection, and wound dehiscence were assessed. There was a significant reduction in the capsule layer (27 seconds; p = 0.02) and global time closure (51 seconds; p = 0.01) in the Q-group. No differences were found in the subcutaneous layer (24 seconds; p = 0.055). There were more intraoperative suture breakages in the Q-group, mainly in the subcutaneous layer (p < 0.001). No differences in terms of dehiscence, infection, and ROM were observed at the 1-month follow-up. BBSs allow for slightly faster wound closure than Vicryl during a TKA. However, the differences observed have minimal clinical repercussions. Moreover, no differences in the infection rate (deep or superficial), dehiscence, or ROM were found.
The effects of corrective feedback with and without revision on enhancing L2 pragmatic performance
Authors: Minh Nguyen Thi Thuy , Ha Do Thi Thanh , Thuy Pham Thi Thanh , Anh Nguyen Tuan 
Published: May 2019

AbstractThis study investigated the efficacy of different feedback conditions in developing accurate and fluent production of L2 English email requests. Sixty-nine intermediate-level Vietnamese EFL university students were randomly assigned to one control and three experimental groups. All the four groups received three hours of explicit metapragmatic instruction on email requests, but only the experimental groups received written corrective feedback on their pragmatic production. One experimental group received feedback without opportunity for revision. Another experimental group received one cycle of feedback and revision, and the third group two cycles of feedback and revision. Results of a Discourse Completion Task (DCT) pre-test, immediate post-test, and delayed post-test indicated that the combination of instruction and feedback had a positive effect on the accuracy of learners’ pragmatic performance. However, no clear-cut evidence for the effect of revision on the fluency of learners’ pragmatic performance was found in the study. The findings highlight the effectiveness of corrective feedback and revision in consolidating emergent L2 pragmatic knowledge, but further research is needed to understand how much revision is sufficient to facilitate fluency development.
Actiones secundum fidei1
Authors: Poppi Fabio Indìo Massimo , Kravanja Peter 
Published: May 2019

AbstractIn this article, we describe how antithesis and metaphoric conceptualization interact with each other and which rhetorical effects this interaction brings about. We illustrate this interaction with an analysis of seventeen graffiti artworks by Banksy, who uses the contraposition of visual elements that are characterized by opposite semantic and affective values. This article contributes to the expanding field of empirical studies of visual/pictorial metaphors and antitheses, in which artworks are interpreted according to conceptual dynamics and not only in relation to their thematic, semiotic and representational properties.
High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus
M163Eu *
Authors: He Xiao-Tao , Chen Ze-Long 
Published: May 2019

Abstract
The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus 163Eu are investigated by using the cranked shell model (CSM), with pairing treated by the particle-number conserving (PNC) method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in 163Eu. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state

. More low-lying multi-particle states are predicted in 163Eu. Due to its significant effect on the nuclear mean field, the high-order

deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei 162Sm and 164Gd, there is a 10%~15% increase of

of the one-particle ground-state band in 163Eu. This is explained by the pairing reduction due to the blocking of the nucleon on the proton

[413] orbital in 163Eu.
Strongly screening β− decay antineutrino energy loss in presupernova *
Authors: Liu Jing-Jing , Liu Dong-Mei , Hao Liang-Huan 
Published: May 2019

Abstract
In this study, we investigate the ion-ball screening model (model (I)), focused on the screening electrostatic potential per electron under the Wigner-Seitz approximation and the Q-value correction. By considering the changes of the Coulomb free energy and the effects of strong electron screening (SES) on the Q-value and the Coulomb chemical potential, we discuss the linear-response screening model (model (II)). We also analyze the influence of the SES on the

decay antineutrino energy loss rate by considering the corrections of the Q-value, the electron chemical potential, and electron energy, as well as the shell and pair effects. The antineutrino energy loss rate is found to increase by two orders of magnitude (e.g., the SES enhancement factor reaches 651.9 for model (II)) due to the SES effect.
Computation of products of phase space factors and nuclear matrix elements for double beta decay *
Authors: Stoica S. 
Published: May 2019

Abstract
Nuclear matrix elements (NME) and phase space factors (PSF) entering the half-life formulas of the double-beta decay (DBD) process are two key quantities whose accurate computation still represents a challenge. In this study, we propose a new approach of calculating these, namely the direct computation of their product as an unique formula. This procedure allows a more coherent treatment of the nuclear approximations and input parameters appearing in both quantities and avoids possible confusion in the interpretation of DBD data due to different individual expressions adopted for PSF and NME (and consequently their reporting in different units) by different authors. Our calculations are performed for both two neutrino (

) and neutrinoless (

) decay modes, for five nuclei of the most experimental interest. Further, using the most recent experimental limits for

decay half-lives, we provide new constraints on the light mass neutrino parameter. Finally, by separating the factor representing the axial-vector constant to the forth power in the half-life formulas, we advance suggestions on how to reduce the errors introduced in the calculation by the uncertain value of this constant, exploiting the DBD data obtained from different isotopes and/or decay modes.
Numerical analysis of temperature stratification in the CIRCE pool facility
Authors: Edemetti Francesco , Tassone Alessandro , Narcisi Vincenzo , Giannetti Fabio , Ferroni Luisa , Tarantino Mariano 
Published: May 2019

Abstract
In the framework of Heavy Liquid Metal (HLM) GEN IV Nuclear reactor development, the focus is in the combination of security and performance. Numerical simulations with Computational Fluid Dynamics (CFD) or system codes are useful tools to predict the main steady-state phenomena and how transitional accidents could unfold in GEN IV reactors. In this paper, to support the validation of CFD as a valid tool for the design, the capability of ANSYS CFX 15 to simulate and reproduce mixed natural convection and thermal stratification phenomena inside a pool is investigated. The 3D numerical model is based on the CIRCE facility, located in CR ENEA Brasimone. It is a pool facility, structured with all the components necessary to simulate the behavior of an HLM reactor, where LBE flows into the primary circuit. For the analysis, the LBE physical properties are implemented in CFX by using recent NEA equations [2]. Previously published RELAP5-3D© results [1] are employed to derive accurate boundary conditions for the simulation of the steady-state conditions in the pool and for CFX validation. The analysis focuses on the pool natural circulation with the presence of thermal structures in contact with LBE, considered as constant temperature sources. The development of thermal stratification in the pool is observed and evaluated with a mesh sensitivity analysis.
Modeling heat conduction in open-cell metal foams by means of the Three-Dimensional Thermal Fin theory
Authors: Iasiello M , Savarese C , Damian P J , Bianco N , Andreozzi A , Chiu W K S , Naso V 
Published: May 2019

Abstract
Their relatively high thermal conductivity makes metal open-cell foams promising heat transfer enhancers for lightweight applications. Conduction occurs through both solid and fluid phases, depending on the material and the microstructure. The effective conductivity of a foam is predicted by means of analytical and numerical methods, based on both idealized and realistic foam geometries, as well as by empirical correlations based on experiments. In this paper, a new model for the prediction of the effective thermal conductivity of foams is proposed. The proposed Three-Dimensional Thermal Fin (TTF) theory is based on the Electrochemical Fin (ECF) theory previously applied to the analysis of ion and electron transport through nanoporous materials. It has computational time two - three times shorter than those of current numerical techniques, such as finite-element methods. Starting from a tomography-reconstructed metallic open cell foam, the 3-D structure is modeled as a network. Conventional fin heat transfer scaled equations, applied to each part of the network, allow for the evaluation of the temperature distribution and heat rates. The effective thermal conductivity of the metal foam is then derived. The proposed model is validated by comparison with experimental results as well as with predictive models from the open literature and a finite-element based model.
Performance maps for an air-cooled air conditioning system as a preliminary instrument for the diagnosis of evaporator fouling
Authors: Catrini P. , Piacentino A. , Braun J. E. , Patil A. , Hjortland A. L. 
Published: May 2019

Abstract
During the past few decades, there has been increased interest in the development of automated approaches for detecting and diagnosing faults in air conditioning systems. Among them, thermoeconomic diagnosis is a technique which involves the use of exergy analysis. As a first step towards improving its performance, this work is focused on the thermodynamic and exergy analysis of a direct expansion air conditioning system used in small commercial building applications. The analysis was carried out by means of experimental activities on a 17.5 kW rooftop unit installed at the Herrick Laboratories, Purdue University, Indiana (USA). The system under investigation was equipped with a variable-speed compressor and variable-speed fans, thus allowing the unit to meet different loads. A detailed mapping of the performance of this system was carried out by considering the effect of the outdoor temperature and the cooling load. In addition, the effect of evaporator fouling was investigated. Results showed that poor exergy performance were achieved due to the exergy destruction occurring in the evaporator. Also, when testing evaporator fouling, results showed that this fault contributed to increase the consumption of the mechanical exergy of the air, thus allowing for an easy detection of this fault.
Horizontal Air-Water Two-Phase Flow Measurement Using an Electrical Impedance Probe and a Venturi Flow Meter
Authors: Chiesa G , Bertani C , Falcone N , Bersano A , Salve M DE , Panella B 
Published: May 2019

Abstract
Two-phase flow rate measurement is extremely important in many industrial sectors (nuclear, chemical, oil and gas, etc.). Nevertheless, the instrumentation required to perform these measurements is still very limited despite the huge research efforts during the last years. In the frame of the development of instrumentation for the two-phase flow rate measurement, the main aim of this study is the characterization of a spool piece consisting of a Venturi Flow Meter, and two Electric Capacitance Probes mounted in a horizontal test section, where an air-water two phase flow occurs. The probes response is analyzed versus superficial velocities of liquid and gas, flow patterns and void fraction. The test section consists of a nominal ID 80 mm horizontal transparent pipe equipped with a Venturi Flow Meter, a new capacitance probe with concave electrodes and a SIET designed electrical capacitance probe with ten long linear electrodes. In this experimental campaign, the air flow rate is in the range 0.048-0.119 kg/s (superficial velocity from 8 to 19 m/s) and the range of water flow rate is 0.0040-0.0535 kg/s (superficial velocity from 0.0006 m/s to 0.0103 m/s). These ranges of superficial velocities correspond to wavy stratified and annular-dispersed flow patterns along the test section.
The effect of PPI on thermal parameters in compact heat exchangers with aluminum foam
Authors: Buonomo B , di Pasqua A , Ercole D , Manca O 
Published: May 2019

Abstract
A numerical analysis on a compact heat exchanger in aluminum foam is accomplished. The governing equations in two-dimensional steady state regime are written in local thermal non-equilibrium (LTNE). The physical domain under investigation is made up of a plate in aluminum foam with inside a single array of five circular tubes. The presence of the open-celled metal foam is modelled as a porous media by means of the Darcy-Brinkman-Forchheimer law. The metal foam is characterized by a porosity of 0.93 and different pores per inch (PPI), equal to 5, 10, 20 and 40 are analized. The LTNE assumption is considered to simulate the heat transfer between the fluid phase and the solid matrix of the foam. The compact heat exchanger at different air flow rates is studied with an assigned surface tube temperature. The results are shown in terms of heat and mechanical power ratio. Global parameters such as effectiveness and NTU, typical in compact heat exchangers, are showed. Furthermore, local air temperature and velocity profiles in the smaller cross section, between two consecutive tubes, as a function of Reynolds number are presented.
Preliminary DNS results of friction factor at low Re inside a rectangular channel with 1:10 Aspect Ratio
Authors: Vignati F. , Gramazio P. , Vitali L. , Fustinoni D. , Niro A. 
Published: May 2019

Abstract
A numerical and experimental study is carried on to investigate the fluiddynamical performanced of a smooth duct with Aspect Ratio of 10. The flow Reynolds number is between 470 and 14500, computed over the duct hydraulic diameter, ranging from laminar to turbulent flow. Direct Numerical Simulations are performed, to explore the details of all flow scales, by means of a code developed at Politecnico di Milano.
The presented numerical results include the computation of the friction factor and the identification of the transition from laminar to turbulent flow regime, and reproduce experimental and literature data fairly well. The setup of the described numerical and experimental techniques will allow to carry on a detailed investigation of the fluid-dynamical and thermal performances of ribbed duct.
Mass-Energy-Momentum Radiation in Stueckelberg-Horwitz-Piron (SHP) Electrodynamics
Authors: Land Martin 
Published: May 2019

Abstract
In Stueckelberg-Horwitz-Piron (SHP) electrodynamics individual particles are not restricted to fixed mass shells. Particles and fields may exchange mass along with energy-momentum, while total mass-energy-momentum is conserved for the system. By extension, interacting particles may exchange mass through the fields, and much as a radio transmitter produces electromagnetic waves that carry power to a remote radio receiver, the corresponding SHP apparatus can, in principle, transport mass across spacetime. The conserved Noether current contains energy density and energy flux density into space (Poynting 3-vector) as in Maxwell theory, as well as two additional features of the electromagnetic field: the mass density and mass flux density into spacetime (Poynting 4-vector). In this paper we consider the radiation from a simple dipole antenna in SHP, and use the mass-energy-momentum tensor to compare the results with the standard treatment in Maxwell theory. We find that mass radiation can only take place when the net charge on the entire antenna oscillates along with the current. We show that much as an ideal amplifier drives current into the antenna as the source of the radiated energy, the oscillating net charge drives spacetime events into the antenna as the source of the radiated mass. This process illuminates the event-oriented nature of mass dynamics in SHP theory.
Geometrization of Newtonian Dynamics
Authors: Friedman Yaakov , Scarr Tzvi 
Published: May 2019

Abstract
Riemann’s principle “force equals geometry” provided the basis for Einstein’s General Relativity - the geometric theory of gravitation. In this paper, we follow this principle to derive the dynamics for any conservative force. We introduce the relativity of spacetime : an object lives in its own spacetime, whose geometry is determined by all of the forces affecting it. We also introduce the Generalized Principle of Inertia which unifies Newton’s first and second laws and states that: An inanimate object moves freely, that is, with zero acceleration, in its own spacetime. We derive the metric of an object’s spacetime in two ways. The first way uses conservation of energy to derive a Newtonian metric. We reveal a physical deficiency of this metric (responsible for the inability of Newtonian dynamics to account for relativistic behavior), and remove it. The dynamics defined by the corrected Newtonian metric leads to a new Relativistic Newtonian Dynamics (RND) for both massive objects and massless particles moving in any static, conservative force field, not necessarily gravitational. In the case of the gravitational field of a static, spherically symmetric mass distribution, this metric turns out to be the Schwarzschild metric. This dynamics reduces in the weak field, low velocity limit to classical Newtonian dynamics and also exactly reproduces the classical tests of General Relativity. In the second way, we obtain the RND metric directly, without first obtaining a Newtonian metric. Instead of conservation of energy, we use conservation of angular momentum, a carefully defined Newtonian limit and Tangherlini’s condition. The non-static case is handled by applying Lorentz covariance to the static case.
Quantum equations for massless particles of any spin in curved spacetime
Authors: Moalem Amnon , Gersten Alexander 
Published: May 2019

Abstract
Quantum equations for massless particles of any spin in curved spacetime are presented. These equations can be extended to a global spacetime from the ones derived in a flat spacetime. Here we demonstrate that these equations can be derived also from a scalar Lagrangian, and they form a basis for quantum theory of spins 1 and 2 in in the vicinity of massive objects. The conserved current is calculated by applying Noether theorem and a complete set of commutative observables is determined. The solutions of these equations are considered in a flat Minkowski spacetime and in axially symmetric spacetimes.