bluuebunny/crossref_metadata_2025_split huggingface dataset:
Full-volume three-component intraventricular vector flow mapping by triplane color Doppler
Authors: Vixège Florian , Berod Alain , Courand Pierre-Yves , Mendez Simon , Nicoud Franck , Blanc-Benon Philippe , Vray Didier , Garcia Damien 
Published: March 2022

Abstract

Objective. Intraventricular vector flow mapping (iVFM) is a velocimetric technique for retrieving two-dimensional velocity vector fields of blood flow in the left ventricular cavity. This method is based on conventional color Doppler imaging, which makes iVFM compatible with the clinical setting. We have generalized the iVFM for a three-dimensional reconstruction (3D-iVFM). Approach. 3D-iVFM is able to recover three-component velocity vector fields in a full intraventricular volume by using a clinical echocardiographic triplane mode. The 3D-iVFM problem was written in the spherical (radial, polar, azimuthal) coordinate system associated to the six half-planes produced by the triplane mode. As with the 2D version, the method is based on the mass conservation, and free-slip boundary conditions on the endocardial wall. These mechanical constraints were imposed in a least-squares minimization problem that was solved through the method of Lagrange multipliers. We validated 3D-iVFM in silico in a patient-specific CFD (computational fluid dynamics) model of cardiac flow and tested its clinical feasibility in vivo in patients and in one volunteer. Main results. The radial and polar components of the velocity were recovered satisfactorily in the CFD setup (correlation coefficients,

r

= 0.99 and 0.78). The azimuthal components were estimated with larger errors (

r

= 0.57) as only six samples were available in this direction. In both in silico and in vivo investigations, the dynamics of the intraventricular vortex that forms during diastole was deciphered by 3D-iVFM. In particular, the CFD results showed that the mean vorticity can be estimated accurately by 3D-iVFM. Significance. Our results tend to indicate that 3D-iVFM could provide full-volume echocardiographic information on left intraventricular hemodynamics from the clinical modality of triplane color Doppler.
A novel iron-based superconductor synthesized by the ion exchange technique
Authors: Hu G B , Shi M Z , Wang W X , Zhu C S , Luo X G , Chen X H 
Published: March 2022

Abstract
The superconductivity of the FeSe-based superconductor is extremely sensitive to Fe vacancies in the FeSe plane. In order to reduce the formation of Fe vacancies in the FeSe plane, various low-temperature methods are developed. However, it is still complex and time consuming to control the Fe vacancies concentration. Here, a hybrid iron-based superconductor, Li0.21Se0.05(EG)0.26FeSe (EG: ethylene glycol, C2H6O2), is synthesized by a solvothermal ion-exchange technique using a nearly vacancy-free precursor of (TBA)0.3FeSe as the matrix. Bulk superconductivity with transition temperature (T
c) of 30 K is confirmed by the characterization with the magnetic susceptibility and resistivity measurements. Compared with the pristine FeSe single crystal, x-ray photoelectron spectroscopy results show a decrease of the Fe valence, indicating that electron doping to FeSe plane accounts for the increase of the T
c. Our result suggests that (TBA)0.3FeSe, a nearly vacancy-free precursor with a large distance between the adjacent FeSe planes, is a good template candidate for the synthesis of other hybrid iron-based superconductors using the ion exchange technique.
Solvent-conjugation-induced ultrafast dynamics of enhanced reverse saturable absorption in lead phthalocyanine derivatives solutions
Authors: Du Xinchen , Zhang Yunfeng , Wang Chunrui , Chen Fei , Li Qingyi , Shao Junfeng , Wang Rui , Liu Haibo , Jin Mingxing 
Published: March 2022

Abstract
With the continued development of high-power laser technology, research on laser protection has become extremely important. In this study, an analysis of Z-scan and femtosecond transient absorption spectra data for lead (II) tetrakis (4-cumylphenoxy) phthalocyanine (4-PbPc) solutions prepared using different concentrations and solvents established that charge transfer plays an important role in the optical limiting dynamics of this molecule. Based on the correlation of decay-associated difference spectra (DADS) for different decay channels, it was confirmed that greater charge transfer efficiency was associated with more highly conjugated solvent molecules. In a dilute solution, the polarity of the solvent molecules will influence the optical limiting performance of the solution to an extent, whereas in a highly concentrated solution, the degree of conjugation of the solvent molecules is the main influence. Therefore, the more highly conjugated the solvent and the higher the solution concentration, the higher the excited state absorption cross-section and effective two-photon absorption coefficient, and the longer the triplet lifetime. These results should provide theoretical guidance and experimental clues for the design of materials with better optical limiting performance and promote the further development of laser protection.
Overview on the management of radioactive waste from fusion facilities: ITER, demonstration machines and power plants
Authors: Gonzalez de Vicente Sehila M. , Smith Nicholas A. , El-Guebaly Laila , Ciattaglia Sergio , Di Pace Luigi , Gilbert Mark , Mandoki Robert , Rosanvallon Sandrine , Someya Youji , Tobita Kenji , Torcy David 
Published: March 2022

Abstract
In the absence of official standards and guidelines for nuclear fusion plants, fusion designers adopted, as far as possible, well-established standards for fission-based nuclear power plants (NPPs). This often implies interpretation and/or extrapolation, due to differences in structures, systems and components, materials, safety mitigation systems, risks, etc. This approach could result in the consideration of overconservative measures that might lead to an increase in cost and complexity with limited or negligible improvements. One important topic is the generation of radioactive waste in fusion power plants. Fusion waste is significantly different to fission NPP waste, i.e. the quantity of fusion waste is much larger. However, it mostly comprises low-level waste (LLW) and intermediate level waste (ILW). Notably, the waste does not contain many long-lived isotopes, mainly tritium and other activation isotopes but no-transuranic elements. An important benefit of fusion employing reduced-activation materials is the lower decay heat removal and rapid radioactivity decay overall. The dominant fusion wastes are primarily composed of structural materials, such as different types of steel, including reduced activation ferritic martensitic steels, such as EUROFER97 and F82H, AISI 316L, bainitic, and JK2LB. The relevant long-lived radioisotopes come from alloying elements, such as niobium, molybdenum, nickel, carbon, nitrogen, copper and aluminum and also from uncontrolled impurities (of the same elements, but also, e.g. of potassium and cobalt). After irradiation, these isotopes might preclude disposal in LLW repositories. Fusion power should be able to avoid creating high-level waste, while the volume of fusion ILW and LLW will be significant, both in terms of pure volume and volume per unit of electricity produced. Thus, efforts to recycle and clear are essential to support fusion deployment, reclaim resources (through less ore mining) and minimize the radwaste burden for future generations.
Study about the chip formation in the turning process using the finite element analysis
Authors: Pop Alina Bianca , Țîţu Aurel Mihail 
Published: March 2022

Abstract
At this time, there is a significant interest in the chip shape and formation at the international level, an issue studied based on mathematical calculations, experiments, and finite element analysis. The analysis of the chip formation process showed that the thickness of the undetached chip also varies according to the rake angle of the cutting tool, and using 3D models to analyze the chip formation process demonstrates this fact. Following the research, a study was conducted in which an analysis of the chip morphology is presented. Using Deform 2D application, a finite element simulation - a comparative analysis of the chip formation was performed when the value of the clearance angle varies. The increasing variety of cutting radius values has an influence on the way the chips are formed in terms of thickness, which generate differences in its shape. Following the study, a series of conclusions and own findings emerged that with the increase of the cutting-edge radius, the stress distribution is radial over a greater area of the part, reason for which the deformation of the chip is smaller. Arguments have also been made on distribution of the temperature, which is directly influenced by the shape of the tool, influencing the temperature of the generated chip. The results also show that with the increase of the cutting-edge radius of the tool, there is a tendency for the detached chip to settle.
Corrective profiling method for tools that generate by enwrapping
Authors: Moroşanu G A , Teodor V G , Crăciun R 
Published: March 2022

Abstract
There are known methods of corrective profiling of tools, which can predict the quality of parts generating obtained with cutting tools that process by enwrapping. The purpose of this profiling is to avoid errors caused by improper profiles of generating tools, using the so-called method of "reverse generation", which is based on the reproduction of the relative movement between the tool and the part, but in which the tool profile is known, and the goal is determining the part’s profile. The method presented in this paper uses the "virtual pole" method to profile the tools generating by enwrapping, by the rolling method and avoids the need to explicitly write the enveloping condition. This paper demonstrates the possibility of applying this method to the profiling of gear-shaped tools and presents the application of the proposed algorithm for a tool whose profile was determined directly by measurement. The numerical application developed demonstrates the ability of the method to simply solve the problems related to the corrective profiling of the tools that generate by rolling.
Experimental results on the quality of the surface on turning with inclined tangential cutting line
Authors: Puriciuc M V , Cioară R , Pisarciuc C 
Published: March 2022

Abstract
The authors devised an innovative processing method, called turning with inclined tangential cutting line. To validate the concept a suitable tool was made, and experimental research was performed in order to evaluate the results from the perspective of the quality of the generated surfaces. The research program involved the processing of various materials with operating modes characterized by the same depth of cut, but different speeds and feed rates. The roughness of the obtained surfaces was measured using a high-performance electronic roughness meter. For comparison, processing under similar conditions was performed using a normal tool. This paper presents a number of experimental results and relevant conclusions supported by them. Also, some directions of further research are highlighted. The authors considered both logical and necessary outcomes after critical analysis of results and in terms of extending the parameters that characterize the designed process.
Application of zirconium in dentistry for creating dental crowns
Authors: Pavlova D , Filchev R , Dovramadjiev T 
Published: March 2022

Abstract
Modern dental healthcare is unthinkable without the use of biocompatible materials. They must have the necessary mechanical properties to ensure the strength of dental structures, as well as be as acceptable as possible by the human body. In recent years, there has been an increase in the application of zirconium dioxide (ZrO2) material to metal ceramics in the manufacture of dental crowns, bridges and others. This has its natural continuation of the evolution of dental materials, which significantly improve human health not only in the oral area but also in complex, where the goal is to minimize the external contact of biological tissue with certain metal components. The present study shows the application of zirconium in the development of crowns on dental implants. Technological working hours are optimized. The process is followed in detail, highlighting important points that accompany the practical part of making the dental crown through the use of modern technologies in design. To objectively present the information in the study, a set of photographic material is presented, visualizing in detail important moments in the production of the zirconium crown.
An aerodynamic theoretical study on exterior accessories of intervention vehicles
Authors: Ilea L , Iozsa D , Fratila G 
Published: March 2022

Abstract
In the last decades, an extended set of restrictions and requirements for the automotive industry were imposed due to the increased concern for the environment and the population’s health. Their purpose is to gradually reduce the level of emissions. Personal and commercial vehicles represent an important percent of total industry emissions footprint [1], however, intervention vehicles also bring a significant contribution in this area. The current paper proposes a theoretical study from an aerodynamic point of view of generic exterior equipment such as warning lights, sound devices, etc. for different body types such as sedan, hatchback, SUV, trucks. While the base vehicle complies with standard regulations regarding the emissions, the paper will highlight the significant impact brought by these elements when integrated on the vehicle, outside the manufacturer’s development process. The paper will also show the relationship between equipment’s dimension and position and the aerodynamic coefficient, though in fuel consumption and overall emissions performance.
Nondestructive evaluation of nanostructured components using Eddy current microsensor
Authors: Iftimie N , Steigmann R , Faktorova D , Savin A 
Published: March 2022

Abstract
Nanostructured materials (NMs) are used in the manufacture of microsensors and some MEMS devices, include nanoscale wires, carbon nanotubes, biomaterials, etc. Nondestructive evaluation of structural integrity of NMs can be carried out by optical (SEM, EBDS) and electromagnetic methods (eddy current). Due to small dimensions of the objects to be tested, the eddy current sensors used in detection of possible discontinuities requires miniaturization so that the answer in amplitude and phase shall allow their localization. In the case of thin tubes made of 304 hard stainless steel, with outer diameters 332μm and wall thickness 38 μm used in medical devices, intended for special catheters, their small dimensions and possible discontinuities require encircling sensor working at high frequencies of the order of MHz. The paper presents the investigation of small diameter tubes using an Eddy current microsensor and the results obtained at the detection of artificial flaws in order to increase the probability of detection (POD), for a high reliability coefficient.
A research of new potential vibration cancellation techniques with the use of piezo stacks
Authors: Harazin J , Wróbel A 
Published: March 2022

Abstract
Piezoelectric materials offer an ability to exchange energy between electrical and mechanical systems with fair ease, by using the direct and inverse piezoelectric effect. Piezoelectric transceivers, sensors, microphones, actuators or active acoustic noise cancellation devices are some of many applications for piezoelectric materials. Due to the natural ability of the material to convert electricity and mechanical strain, solutions based on piezoelectric materials are often compact and allow applications on micro scales. This article aims at expanding the applicability of piezoelectric materials to dampen vibrations of broader spectrum and bigger amplitudes, in hopes for finding new possible solutions for damping vibrations generated by heavy duty equipment or machines associated with manufacturing processes. The study involves parallel attempts at creating algorithms and mathematical models using classical mathematical algebra and deep learning techniques to actively dampen incoming vibrations with the use of piezoelectric plates. The novelty of this study would involve using piezoelectric plates of different sizes and properties in a single stack, to dampen the frequencies and amplitudes of incoming vibrations.
Turning tool with tangential cutting line. Concept and constructive solution
Authors: Puriciuc M V , Cioară R , Pisarciuc C 
Published: March 2022

Abstract
New ways to increase the performance of metal cutting are constantly being sought. Although diverse and increasingly performing tools are designed and used, especially those with inserts, rarely new processing schema are identified in order to ensure favourable conditions to obtain a higher quality for generated surfaces. The paper presents a particular and innovative processing schema, as well as a specific tool for machining cylindrical surfaces by turning with a tangential cutting line. The active part of the latter is an insert whose cutting line is placed frontally in a vertical plane and considerably inclined in relation to the horizontal plane. In order to validate the concept, a variation of the tool has been developed and tested, one that doesn’t present the option of adjusting the angle of the cutting line. The success thus achieved prompted the design of a tool that allows the cutting line to be tilted at any angle in relation to the horizontal plane. A patent application has been filed in this regard.
Using 3D scanning in assessing the dimensional accuracy of mechanically machined parts
Authors: Afteni Cezarina , Paunoiu Viorel , Afteni Mitica , Teodor Virgil 
Published: March 2022

Abstract
In recent years, productivity and competitiveness have played a major role in manufacturing. To improve these aspects, many companies use computer-aided inspection (CAI) technologies. Inspection of parts, using 3D scanning technologies, is one the most modern and competitive ways to ensure the quality control of products. This paper presents a study on the assessment of the machined parts’ dimensional accuracy. An Atos Core device for 3D scanning of the part was used. The Atos device allows a non-contact inspection of the part’s entire surface, generating a very dense point cloud, which stores, with great accuracy, all the details of the inspected object. The machined part is compared with its numerical model, obtained by computer-aided design (CAD). The accuracy of the machining was proven to be very good, and the inspection’s result proves that the dimensions of the piece fall within the tolerance limits. A complete inspection of the piece, using 3D scanning, guarantees a fast and accurate quality control, thus reducing the production times.
Hybrid organization of manufacturing and operations: the Ukrainian case under quarantine restrictions
Authors: Omelianenko T , Korotkova K , Banschykov P , Sahaidak M , Sobolieva T 
Published: March 2022

Abstract
Abstracts. The paper presents the dynamics of the ratio of productive and non -productive spheres in the economy of Ukraine in the pre-quarantine period. Trends in changes in the business processes of manufacturing companies caused by the introduction of strict quarantine in Ukraine due to the COVID-19 pandemic have been identified. It was analysed the official statistics on business closures. It was determined which businesses developed rapidly during the quarantine period and the starting point of this success is established - a hybrid approach to the organization of production. That is a combination of traditional and digital approaches, i.e. offline and online. It was analysed the successful cases of Ukrainian manufacturing companies, which quickly reoriented to the hybrid approach. It was summarized the results of the recommendations on the application of the hybrid approach in the reorganization of manufacturing and operations.
Progress of graphdiyne-based materials for anodes of alkali metal ion batteries
Authors: Liu Manman , Ma Yue , Fan Xiaofeng , Singh David J , Zheng W T 
Published: March 2022

Abstract
Graphdiyne (GDY)-based materials are carbon allotropes with a two-dimensional (2D) planar structure composed of diacetylene bonds (sp) and sp
2 hybridized carbons. Their unique geometrical and electronic structure give them excellent electrochemical properties. The larger specific surface area and ion-diffusion channels in pores can provide more storage sites for alkali metal ions and increase the diffusion rate of electrons and ions. Hence, GDY-based materials possess broad prospects in electrochemical energy storage and have gained more favor as anode materials for alkali ion batteries. Here, we have made a systematic summary of GDY-based materials and their derivatives, including the geometrical and electronic structures, synthesis, modifications, and storage mechanisms of Li+/Na+/K+, along with the applications in Li+/Na+/K+ batteries. In view of the current situation, the large-scale application of GDY-based materials as anodes in alkali ion batteries is still a great challenge. We hope that this work can provide a theoretical basis for GDY-based materials with superior performance, more convenient and safer preparation, and higher yield.
Effect of TiW blocking layer and temperature annealing on resistive switching parameters of Hafnium oxide based CBRAM device
Authors: Lata Lalit Kumar , Jain Praveen Kumar , Sharma Amit 
Published: March 2022

Abstract
An approach for enhancing the characteristics of resistive switching in the crystalline Hafnium oxide-based CBRAM (Conductive Bridging Resistive Switching Memory) device is reported in this article. The crystalline Hafnium oxide resistive switching layer and the TiW blocking layer are beneficial for controlling filament growth. Improved resistive parameters, including stability and resistance distribution, were successfully demonstrated in Cu/TiW/annealed-HfO2/Pt devices compared to Cu/HfO2/Pt-based devices. Moreover, the proposed bipolar device demonstrates improved memory performance, such as good retention characteristics (>104 s) and a high ON/OFF resistance ratio.
Esophageal Adenocarcinoma in an Active Duty Sailor: A Case Report
Authors: Wilson Benjamin F , Dang John , Masuda Dane , Cowler Trevor 
Published: March 2022

ABSTRACT
Esophageal adenocarcinoma develops when normal squamous epithelia are replaced by dysplastic intestinal columnar cells in response to chronic gastroesophageal reflux disease (GERD). In addition to squamous cell carcinoma, the two malignancies account for over 95% of esophageal malignancies. This case describes a sailor deployed onboard an aircraft carrier who initially presented with typical GERD symptoms and later developed multifactorial weight loss confounded by the operational environment. Upon return to homeport, he was diagnosed with stage III gastroesophageal junction adenocarcinoma. This case emphasizes the difficulty in identifying and diagnosing a rare and dangerous pathology in the resource-limited, operational environment.