bluuebunny/crossref_metadata_2025_split huggingface dataset:
Automatic liquid flow controller for hydraulic drilling machine
Authors: Vasiliev VB , Muslimov AP , Vasiliev VA 
Published: February 2022

Abstract
The procedure for conducting scientific experiments in the development of an automatic flow regulator with hydraulic control is considered. The necessity of using automatic systems in the drilling process is proved. The results of experimental studies of liquid flow regulator, namely its output characteristic and oscillograms of hydraulic motor acceleration under various operating modes are presented.
Blasting impact on underground openings in Magnezitovaya Mine
Authors: Kutuev VA , Menshikov PV , Zharikov SN 
Published: February 2022

Abstract
The authors assess blasting-induced seismic impact on underground openings in Magnezitovaya Mine, determine seismic stability and adjacent rocks and calculate safe distance of blasting based on the criterion of allowable seismic loads. The blasting impact testing was carried out using seismic recorders Uran and Minimate Plus with three-component seismic receivers. It is recommended on setting limiting mass of explosive per delay interval in underground blasting.
Simulation model of a hydro-impact system with two limiters of striker movement
Authors: Gorodilov LV , Pershin AI 
Published: February 2022

Abstract
A simulation model of a one-way self-oscillating hydro-impact system with two limiters of striker movement has been developed. The system includes a pump (a constant flow source), a striker (piston) and a housing (with limiters) connected by a mechanical spring, a spool valve, a gas-liquid accumulator, and connecting hydraulic lines. By comparing the results of calculations on the simulation model with the results of calculations on the ideal model (without hydraulic and mechanical losses and with instantly switching valve), the developed model was verified. Calculations of the working modes of reverse hydro-impact devices with an impact energy of 80 and 160 J were performed, their parameters were determined, and the real geometry of the devices was evaluated. The equipment being developed can be used to overcome jamming of equipment during drilling and using of special equipment in drilled holes, and driving holes by impact method in ground.
Patent and information analysis of evaluating the development level of technical solutions for gold heap leaching from technogenic raw materials in the cryolithzone
Authors: Myazin VP , Sokolova ES , Ardanaeva SA 
Published: February 2022

Abstract
An analysis of the development level of physical and chemical gold heap leaching geotechnology, used by leading gold mining countries, has been carried out with the use of the patent-information analyses of technical solutions. Based on the use of the existing information, a comparative quantitative evaluation of technical solutions for the objects of the invention at two modes of leaching (seasonal and year-round) is given.
Modeling of hydraulic fracture in a medium containing a hollow inclusion
Authors: Azarov AV , Serdyukov SV , Patutin AV 
Published: February 2022

Abstract
In this work, the problem of the development of a hydraulic fracture crack near a circular cavity in a three-dimensional homogeneous elastic medium is considered. The results of numerical calculations performed using the extended finite element method (XFEM) implemented in the ABAQUS software package are presented. Various variants of the position of the initial disk crack relative to the cavity are considered. Some regularities of the development of a three-dimensional hydraulic fracture near the cavity have been found.
Technological and environmental features of heap leaching of Delmachik gold-bearing ores deposit
Authors: Razmakhnin KK , Vasiljuk PA 
Published: February 2022

Abstract
The problem of gold ores hydrometallurgical processing with using sodium cyanide is evaluated. The prospects for the development of the use of cyanide-free reagents for leaching gold from ores are studied. The possibility of introducing a cyanide-free environmentally friendly reagent instead of the widely used sodium cyanide was determined. The results of experimental studies on the comparability of the processing of gold ores using sodium cyanide and a reagent based on sodium cyanoate are obtained. The optimal parameters of the technological process for the extraction of gold from ores using a cyanide-free reagent are established.
Shock wave analysis: A case-study of Magnezitovaya Mine
Authors: Menshikov PV , Kutuev VA , Zharikov SN 
Published: February 2022

Abstract
The article presents the studies into the impact of shock waves induced by underground blasting. The instrumental measurement of actual pressures at the shock wave front in air in Magnezitovaya Mine during blasting is performed. Using the measurement data, the safe distances of shock wave impact out of possible personnel injury risk are determined. The excess pressure at the shock wave front in mine air is calculated with regard to local pressure losses. The calculated excess pressures are compared with the maximum allowable pressures for personnel, timber cofferdams, ventducts, appliances and power lines.
Method of studying the movement of the impact device case in the well taking into account the reaction of the rock massif
Authors: Gorodilov LV , Efimov VP , Sazhin PV , Kudryavtsev VG , Pershin AI 
Published: February 2022

Abstract
Abstract A technique of experimental study of the movements of the impact device case in the well has been developed, including the use of “low-frequency” (current-vortex) displacement sensors and “high-frequency” (accelerometers) acceleration sensors. After registration, software signal processing was performed, including double integration of accelerations and determination of points of interface of displacements obtained after integration and direct registration. Oscillograms of measurements at different values reaction from the rock mass are given. The quantitative aspects of the phenomenon are discussed, and an attempt is made to identify the relationship between the quantitative indicators of impact pulses and the movement of impact device body.
Icephobic approach on hierarchical structure polymer thin-film
Authors: Hanh Vu Thi Hong , Chi Do Thuy , Ha Chu Viet , An Pham Mai , Thi Minh Thuy Nguyen , Thi Trang Bui , Mai Dam Thanh , Sonemany Souphaphone , Nguyen Thanh-Binh 
Published: February 2022

Abstract
In this study, we emphasised the anti-icing effects of the two-scale structure fabricated on Ecoflex thin film in several criteria for icephobic applications. The functional thin film was achieved by combining the low surface tension lubricant with a hierarchical structure, which was generated by the dry ion etching method. The anti-icing performance including adhesion strength, ice repellency, and durability was then compared with as-received substrate and non-slippery surface to demonstrate the superiority of two-scale texture in all mentioned criteria. The slippery hierarchical thin film exhibited outstanding performance with extremely low ice-surface adhesion strength, high ice repellency, and durability. This offers a new facile approach and proposed a unique design for icephobic applications such as wild shields, smart devices, cooling systems, and other outdoor equipment
Synthesis, characterization, and in vitro DPPH radical scavenging assay study of PEG-capped carbon nanoparticles derived from Butea monosperma flower extract
Authors: Das Arijit , Prabhu M P Taraka , Sarkar Nandini 
Published: February 2022

Abstract
In this work, the core carbon nanoparticles (BM CNs) and polyethylene glycol 400 (PEG400)-capped BM CNs were synthesised from Butea monosperma flower extract via the facile direct heating method. They were investigated for their intriguing properties and in vitro antioxidation activity in comparison with Carica papaya seed (CPS) extract via DPPH assay. The CNs were characterised by DLS, XRD, HR-TEM, TGA, FT-IR, UV–vis spectral analysis and quantum yield measurement. The PEGylated CNs demonstrated decent quantum yield, favourable size, and turbostratic carbon phase apart from better stability and dispersion nature as compared to the uncapped entity. The mildly stable uncapped sample with zeta potential −17.9 mV featured its extensively aggregated form, unlike the capped sample with −23.0 mV zeta potential, which sheds light on its enhanced stability by PEG400. Antiradical capacities of the CNs in comparison with CPS extract demonstrated the PEG400-bound nanomaterial of its superior antiradical activity against the other two controls. This study provides an insight into the novel polymer-CNs’ potent antioxidant property which can be further explored for its incorporation in targeted drug delivery and other biomedical applications.
Mapping the complex refractive index of single layer graphene on semiconductor or polymeric substrates at terahertz frequencies
Authors: Pistore Valentino , Balci Osman , Zhang Jincan , Schinde Sachin M , Meersha Adil , Ferrari Andrea C , Vitiello Miriam S 
Published: February 2022

Abstract
Assessing experimentally the main optical parameters of graphene (e.g. complex refractive index, carrier density, mobility) in the far-infrared (0.1–10 THz) is important for quantum science, due to the possibility to devise miniaturized devices (frequency combs, random lasers), components (optical switches, spatial light modulators, metamaterial mirrors and modulators) or photonic circuits, in which graphene can be integrated with existing semiconductor technologies to manipulate their optical properties and induce novel functionalities. Here, we combine time domain terahertz (THz) spectroscopy and Fourier transform infrared spectroscopy to extract the complex refractive index of large (∼1cm2) area single layer graphene on thin (∼0.1-1 µm) polymeric suspended substrates, flexible and transparent films, and high reflectivity Si substrates in the 0.4–1.8 THz range. We model our data to extract the relevant optical (refractive index, absorption coefficient, penetration length) electronic (Fermi velocity) and electrical (carrier density, mobility) properties of the different graphene samples.
A new method for assessing the structural safety of refractory ceramics based on a three-factor comprehensive criterion
Authors: Chen Guobing , Yang Feiyue , Zhao Shuang , Yang Zichun , Chen Jun 
Published: February 2022

Abstract
Traditional structural safety criteria are difficult to apply in assessing the structural safety of refractory ceramics. Herein, a three-factor comprehensive criterion for structural safety assessment of high-temperature refractory ceramics is proposed based on the failure mechanism of refractory ceramics. For the critical temperature difference criterion, the temperature of refractory ceramics changes sharply (530 °C) after the boiler stop for 120 s. Correspondingly, the left critical crack length is found to be 21 μm and the crack finally propagates to 10.87 cm (with a crack density of N = 1 cm−3) under thermal shock. For strength attenuation criterion, the cracks initiate when the compressive and tensile stress values caused by thermal shock exceed the inherent strength of refractory ceramics. Hence, the average stress of 20 MPa can be selected as the applied stress level, where the calculated life of refractory ceramics is comparable to the actual life. For the stress intensity factor criterion, the stress intensity factor (K

I
) increases with the increase of crack depth (a) and crack length (c) during crack propagation, but it decreases when a and c increase to certain values. These results reveal that the three-factor comprehensive criterion is highly applicable in analyzing the failure of refractory ceramics, providing support for the maintenance decisions during practical applications.
Study on the characteristics of non-Maxwellian magnetized sheath in Hall thruster acceleration region
Authors: CHEN Long , AN Yuhao , SUN Shaojuan , DUAN Ping , JIANG Borui , YANG Yehui , CUI Zuojun 
Published: February 2022

Abstract
The secondary electron emission (SEE) and inclined magnetic field are typical features at the channel wall of the Hall thruster acceleration region (AR), and the characteristics of the magnetized sheath have a significant effect on the radial potential distribution, ion radial acceleration and wall erosion. In this work, the magnetohydrodynamics model is used to study the characteristics of the magnetized sheath with SEE in the AR of Hall thruster. The electrons are assumed to obey non-extensive distribution, the ions and secondary electrons are magnetized. Based on the Sagdeev potential, the modified Bohm criterion is derived, and the influences of the non-extensive parameter and magnetic field on the AR sheath structure and parameters are discussed. Results show that, with the decrease of the parameter q, the high-energy electron leads to an increase of the potential drop in the sheath, and the sheath thickness expands accordingly, the kinetic energy rises when ions reach the wall, which can aggravate the wall erosion. Increasing the magnetic field inclination angle in the AR of the Hall thruster, the Lorenz force along the

x

direction acting as a resistance decelerating ions becomes larger which can reduce the wall erosion, while the strength of magnetic field in the AR has little effect on Bohm criterion and wall potential. The propellant type also has a certain effect on the values of wall potential, secondary electron number density and sheath thickness.
Comparative analysis of single- and multiple-frequency thermal wave radar imaging inspection of glass fiber reinforced polymer (GFRP)
Authors: Liu Lishuai , Mandelis Andreas , Melnikov Alexander , Wang Liming 
Published: February 2022

Abstract
Active infrared thermography has gained increasing popularity for nondestructive testing and evaluation in various industrial fields, especially for composite structures. In this regard, thermal wave radar (TWR) imaging is recognized as the next-generation active thermography technology to obtain great resolution and depth range over the inspected objects. A critical aspect concerns the optimal test parameter selection to guarantee reliable quality assurance required for industrial products. In this work, single- and multiple-frequency TWR was investigated in a quantitative manner with the goal of optimizing the detection parameters in terms of probing range and lateral and depth resolution. The effects of test parameters, including sampling frequency, modulation frequency, chirp duration, chirp bandwidth, etc, were investigated in detail through experiments on a glass fiber reinforced polymer specimen with multi-scale diameter-to-depth ratio defects. This paper aims to help yield a better understanding of the physical mechanism behind TWR and propose a workable scheme for testing parameter selection in practical applications.
A Bayesian Spatiotemporal Nowcasting Model for Public Health Decision-Making and Surveillance
Authors: Kline David , Hyder Ayaz , Liu Enhao , Rayo Michael , Malloy Samuel , Root Elisabeth 
Published: February 2022

Abstract
As coronavirus disease 2019 (COVID-19) spread through the United States in 2020, states began to set up alert systems to inform policy decisions and serve as risk communication tools for the general public. Many of these systems included indicators based on an assessment of trends in numbers of reported cases. However, when cases are indexed by date of disease onset, reporting delays complicate the interpretation of trends. Despite a foundation of statistical literature with which to address this problem, these methods have not been widely applied in practice. In this paper, we develop a Bayesian spatiotemporal nowcasting model for assessing trends in county-level COVID-19 cases in Ohio. We compare the performance of our model with the approach used in Ohio and the approach included in decision support materials from the Centers for Disease Control and Prevention. We demonstrate gains in performance while still retaining interpretability using our model. In addition, we are able to fully account for uncertainty in both the time series of cases and the reporting process. While we cannot eliminate all of the uncertainty in public health surveillance and subsequent decision-making, we must use approaches that embrace these challenges and deliver more accurate and honest assessments to policy-makers.
CobraMod: a pathway-centric curation tool for constraint-based metabolic models
Authors: Camborda Stefano , Weder Jan-Niklas , Töpfer Nadine 
Published: February 2022

AbstractSummaryCOnstraint-Based Reconstruction and Analysis of genome-scale metabolic models has become a widely used tool to understand metabolic network behavior at a large scale. However, existing reconstruction tools lack functionalities to address modellers' common objective to study metabolic networks on the pathway level. Thus, we developed CobraMod—a Python package for pathway-centric modification and extension of genome-scale metabolic networks. CobraMod can integrate data from various metabolic pathway databases as well as user-curated information. Our tool tests newly added metabolites, reactions and pathways against multiple curation criteria, suggests manual curation steps and provides the user with records of changes to ensure high quality metabolic reconstructions. CobraMod uses the visualization tool Escher for pathway representation and offers simple customization options for comparison of pathways and flux distributions. Our package enables coherent and reproducible workflows as it can be seamlessly integrated with COBRApy and Escher.Availability and implementationThe source code can be found at https://github.com/Toepfer-Lab/cobramod/ and can be installed with pip. The documentation including tutorials is available at https://cobramod.readthedocs.io/.
Ventricular assist devices in transposition and failing systemic right ventricle: role of tricuspid valve replacement
Authors: Gonzalez-Fernandez Oscar , De Rita Fabrizio , Coats Louise , Crossland David , Nassar Mohamed S , Hermuzi Antony , Santos Lopes Bruno , Woods Andrew , Robinson-Smith Nicola , Petit Thibault , Seller Neil , O’Sullivan John , McDiarmid Adam , Schueler Stephan , Hasan Asif , MacGowan Guy , Jansen Katrijn 
Published: February 2022

Abstract

OBJECTIVES
Ventricular assist device (VAD) for systemic right ventricular (RV) failure patients post-atrial switch, for transposition of the great arteries (TGA), and those with congenitally corrected TGA has proven useful to reduce transpulmonary gradient and bridge-to-transplantation. The purpose of this study is to describe our experience of VAD in systemic RV failure and our move towards concomitant tricuspid valve replacement (TVR).

METHODS
This is a single-centre retrospective study of consecutive adult patients receiving HeartWare VAD for systemic RV failure between 2010 and 2019. From 2017, concomitant TVR was performed routinely. Demographic, clinical variables and echocardiographic and haemodynamic measurements pre- and post-VAD implantation were recorded. Complications on support, heart transplantation and survival rates were described.

RESULTS
Eighteen patients underwent VAD implantation. Moderate or severe systemic tricuspid regurgitation was present in 83.3% of patients, and subpulmonic left ventricular impairment in 88.9%. One-year survival was 72.2%. VAD implantation was technically feasible and successful in all but one. Post-VAD, transpulmonary gradient fell from 16 (15–22) to 10 (7–13) mmHg (P = 0.01). Patients with TVR (n = 6) also demonstrated a reduction in mean pulmonary and wedge pressures. Furthermore, subpulmonic left ventricular end-diastolic dimension (44.3 vs 39.6 mm; P = 0.03) and function improved in this group. After 1 year of support, 72.2% of patients were suitable for transplantation.

CONCLUSIONS
VAD is an effective strategy as bridge-to-candidacy and bridge-to-transplantation in patients with end-stage systemic RV failure. Concomitant TVR at the time of implant is associated with better early haemodynamic and echocardiographic results post-VAD.
Screening for potential mycoherbicides within the endophyte community of Phelipanche ramosa parasitizing tobacco
Authors: Gibot-Leclerc Stéphanie , Guinchard Lucie , Edel-Hermann Véronique , Dessaint Fabrice , Cartry Dïnia , Reibel Carole , Gautheron Nadine , Bernaud Eric , Steinberg Christian 
Published: February 2022

Abstract
Branched broomrape (Phelipanche ramosa (L.) Pomel) is an achlorophyllous root parasitic plant with a wide host range. Its complex management is leading to the abandonment of tobacco or oilseed rape cultivation in the most affected regions in France. Among broomrape regulation factors, soil microorganisms such as fungi seem to be a relevant biocontrol lever. The aim of this work was to detect potential mycoherbicides among fungal endophytic colonizers of P. ramosa parasitizing tobacco. Our hypothesis was that both the inhibitory of broomrape seed germination and the necrotic activities are characteristic of the fungal isolates whatever their taxonomic position. To test this hypothesis, we analysed the taxonomic and functional diversity of fungal isolates of symptomatic P. ramosa collected from infested tobacco-growing regions in France in order to identify one or more fungal strains for future biocontrol. The fungal isolates were characterized using morphological and molecular identification tools and tested for their ability to inhibit the germination of P. ramosa seeds, their necrotic activity on the stems of the pest and their non-pathogenicity to the host plant. We highlighted the specific richness of fungal colonizers associated with symptomatic P. ramosa. Among the 374 collected isolates, nearly 80% belonged to 19 Fusarium species. Eighty-seven isolates representative of this diversity also showed functional diversity by inhibiting seed germination of the parasite. The 20 best-performing isolates showed differences in germination inhibition of P. ramosa at the intraspecific level. Among these 20 fungal isolates, a set of 15 randomly selected isolates was tested for their necrotic activity on the parasite stems. Fusarium venenatum isolates showed dual competence, i.e. germination inhibition and necrotic activity, and were non-pathogenic to tobacco. This led us to discuss the potential mycoherbicidal effect of this fungal species on P. ramosa.