bluuebunny/crossref_metadata_2025 huggingface dataset:
Polysaccharide-based nanocomposites for biomedical applications: a critical review
Authors: Shokrani Hanieh , Shokrani Amirhossein , Sajadi S. Mohammad , Khodadadi Yazdi Mohsen , Seidi Farzad , Jouyandeh Maryam , Zarrintaj Payam , Kar Saptarshi , Kim Seok-Jhin , Kuang Tairong , Rabiee Navid , Hejna Alexander , Saeb Mohammad Reza , Ramakrishna Seeram
Published: June 2022

Polysaccharides (PSA) have taken specific position among biomaterials for advanced applications in medicine.
Reductive coupling of allenoates with aldehydes catalyzed by halogenotin hydride
Authors: Suzuki Itaru , Hamada Yu-ya , Uji Yuki , Shibata Ikuya
Published: June 2022

Hydrostannylation of allenoate 1 with halogenotin hydride (Bu2SnClH) was developed to give allylic stannane (I), which then could react with aldehyde 2.
pH sensitive water-in-water emulsions based on the pullulan and poly(N,N-dimethylacrylamide) aqueous two-phase system
Authors: Plucinski Alexander , Schmidt Bernhard V. K. J.
Published: June 2022

A novel aqueous two-phase system based on pullulan and poly(N,N-dimethylacrylamide) is presented. Furthermore, it is used for the formation of pH sensitive water-in-water emulsions.
Excited-state cobaloxime catalysis enabled scalable oxidant-free dehydrogenative C–H phosphinoylation of undirected heterocycles
Authors: Shao Ailong , Chen Jifang , Wang Lingxiao , Yi Mingchen , Yang Han , Zhang Yuqing , Fan Suhua , Chen Shuisheng , Wu Hai , Shi Renyi
Published: June 2022

Visible-light-induced excited-state cobalt catalysis enables C(sp2)–H/C(sp3)–H phosphinoylation accompanied by H2 evolution. The reaction achieves the late-stage modification of more than 10 distinct classes of heterocycles and arenes.
Divergent synthesis of 4-amino indoles with free amine groups via tandem reaction of 2-alkynylanilines
Authors: Li Xiaohua , He Qiuqin , Fan Renhua
Published: June 2022

A dearomatization method for divergent synthesis of 4-amino indoles having N1 or C4 free amine groups from 2-alkynylanilines was reported.
Organic deliquescence: organic vapor-induced dissolution of molecular salts
Authors: Ishii Kazuyuki , Yokomori Kei , Murata Kei , Nakamura Seiji , Enomoto Kyoko
Published: June 2022

Several molecular salts exhibit organic deliquescence in response to organic vapors.
Reduced graphene oxide-modified Z-scheme g-C3N4/CdS photocatalyst with a staggered structure for the enhanced photoreduction of CO2
Authors: Zhao Xiaoxue , Gao Ming , Liu Qi , Zhang Yunlei , Wang Huiqin , Yang Guoyu , Huo Pengwei
Published: June 2022

The prepared Z-scheme CN/CdS@rGO photocatalyst formed a 2D/2D staggered structure: CN/CdS, CdS/rGO and CN/rGO, which provided more paths for electron transport and greatly improved the photocatalytic CO2 reduction efficiency.
Phthalocyanine polymer grafted graphene oxide matrix as high-performance anode material for lithium-ion batteries
Authors: Zhang He , Li Lucheng , Chen Jun , Dmytro Sydorov , Zhang Qian , Zhong Shengwen
Published: June 2022

GO-CONH-NiPc is synthesized by grafting CONH-NiPc onto a GO matrix, which displays a larger specific surface area, exposes more active sites and accelerates the migration rate of Li+. As a result, better electrochemical behaviors are observed.
Self-assembly of globular proteins with intrinsically disordered protein polyelectrolytes and block copolymers
Authors: Horn Justin M. , Zhu Yuncan , Ahn So Yeon , Obermeyer Allie C.
Published: June 2022

Intrinsically disordered polypeptides are a versatile class of materials, combining the biocompatibility of peptides with the disordered structure and diverse phase behaviors of synthetic polymers.
Ion channels in sulfonated copolymer-grafted nanoparticles in ionic liquids
Authors: Li Ruhao , Han Yuke , Akcora Pinar
Published: June 2022

Poly(methyl methacrylate)-b-poly(styrene sulfonate) (PMMA-b-PSS) copolymer-grafted Fe3O4 nanoparticles with different sulfonation levels exhibited concentration dependent ionic conductivities in acetonitrile and HMIm–TFSI/acetonitrile mixtures.
Recyclable CFRPs with extremely high Tg: hydrothermal recyclability in pure water and upcycling of the recyclates for new composite preparation
Authors: Hao Cheng , Liu Tuan , Liu Wangcheng , Fei Ming-en , Shao Lin , Kuang Wenbin , Simmons Kevin L. , Zhang Jinwen
Published: June 2022

In this work, a recyclable epoxy system with superior mechanical performance and high Tg (>200 °C) is developed for CFRPs, and a simple and feasible approach for highly efficient closed-loop recycling of CFRPs is demonstrated.
Ru, B Co-doped hollow structured iron phosphide as highly efficient electrocatalyst toward hydrogen generation in wide pH range
Authors: Wang Zixuan , Wang Yonglong , Xiao Weiping , Wang Xinping , Fu Yunlei , Xu Guangrui , Li Zhenjiang , Wu Zexing , Wang Lei
Published: June 2022

Ru and B co-doped iron hollow spheres (H-B/Ru-FeP) are synthesized by ambient boronation, low-temperature phosphorization and acid leaching processes, and exhibit excellent electrocatalytic performance toward HER in a wide pH range.
Highly stretchable and stretch-induced fluorescence chromism self-healing materials based on boroxine and dynamic imine bond
Authors: Wang Jing , Lai Jiancheng , Jia Xiaoyong
Published: June 2022

A new self-healing luminescent polymer obtained by combining double covalent bond of boroxine with imine bond was designed. It demonstrated excellent self-healing, high stretchability and stretch-induced fluorescence chromism from green to cyan.
A novel privacy‐preserved voluntary outage management model on a transactive energy scheme
Authors: Riki Mahshid , Koochaki Mohaddese , Moeini‐Aghtaie Moein , Abbaspour Ali , Mazaheri Hesam
Published: June 2022

Unpredictable occurrence of natural disasters in modern power systems has significantly increased the attentions to the outage management of multi‐microgrid (MMG) systems. In this regard, a multi‐objective two‐stage outage management scheme is presented in this paper to protect undamaged microgrids (MGs) against load curtailment and minimize the curtailed loads simultaneously. Considering the importance of power system economic, this scheme is designed in a privacy‐preserved transactive energy (TE) market and enables all MGs to participate in outage management voluntarily. In detail, a DC optimization is autonomously operated in the first stage in each MG to supply its demand loads. Then, the second stage is designed to exchange the surplus power of the last stage with the damaged MGs. These voluntary power transactions are pre‐specified in contracts, adjusted between each MG and distributed system operator (DSO). Moreover, in this stage, the ADMM algorithm based on DC‐OPF has prepared a privacy protection platform and proved the results’ accuracy. The presented test grid is the IEEE 34‐node test system and the numeric results demonstrate the effectiveness of the proposed multi‐objective scheme.
Dark matter in galaxy clusters: Parametric strong-lensing approach
Authors: Limousin Marceau , Beauchesne Benjamin , Jullo Eric
Published: June 2022

We present a parametric strong-lensing analysis of three massive galaxy clusters for which Hubble Space Telescope imaging is available, as well as spectroscopy of multiply imaged systems and galaxy cluster members. Our aim is to probe the inner shape of dark matter haloes, in particular the existence of a core. We adopted the following working hypothesis: any group- or cluster-scale dark matter clump introduced in the modelling should be associated with a luminous counterpart. We also adopted some additional well-motivated priors in the analysis, even when this degraded the quality of the fit, quantified using the root mean square between the observed and model-generated images. In particular, in order to alleviate the degeneracy between the smooth underlying component and the galaxy-scale perturbers, we used the results from previous spectroscopic campaigns, which allowed us to fix the mass of the galaxy-scale component. In the unimodal galaxy cluster AS 1063, a core mass model is favoured over a non-core mass model, and this is also the case in the multimodal cluster MACS J0416. In the unimodal cluster MACS J1206, we fail to reproduce the strong-lensing constraints using a parametric approach within the adopted working hypothesis. We then successfully added a mild perturbation in the form of a superposition of B-spline potentials, which allowed us to obtain a decent fit (root mean square = 0.5″), and finally find that a core mass model is favoured. Overall, our analysis suggest evidence for core cluster-scale dark matter haloes in these three clusters. These findings may be useful for the interpretation within alternative dark matter scenario, such as self-interacting dark matter. We propose a working hypothesis for parametric strong-lensing modelling in which the quest for the best-fit model is balanced by the quest for presenting a physically motivated mass model, in particular by imposing priors.
Evolution of material removal in the magnetorheological polishing of Ti6Al4V by laser power bed fusion
Authors: Bao Zhongyu , Chen Bingsan , Na She , Xu Yongchao , Hung Shangchao
Published: June 2022

This study aimed to obtain super smooth surface medical implant laser power bed fusion Ti6Al4V samples. A self-modified magnetorheological polishing device and polishing fluid were used to polish the laser power bed fusion additive shaped Ti6Al4V samples to study the effect of the main factors such as abrasive grain size, polishing pressure, and polishing time on the surface roughness and material-removal efficiency of the samples. With continuously decreased Al2O3 abrasive-particle size, the surface roughness initially increased and then decreased, and the material-removal rate decreased. The polishing result of 5 µm Al2O3 was better, no new scratch damage was found after 3 µm Al2O3 polishing; With increased polishing pressure from 5 N to 25 N, the deeper the abrasive particles were pressed, the greater the cutting effect and the more obvious the scratches. Surface roughness initially decreased and then increased, and the material-removal rate increased from 1.19 nm/min to 8.68 nm/min. With continuously extended polishing time, the grinding and polishing effect continued to accumulate, and the surface quality significantly improved, decreasing from 366.33 nm to 19.77 nm. These results showed that magnetorheological polishing technology was very effective in removing LPBF forming defects; the surface roughness was reduced by 96.27% and the additive defects can be completely removed.
The Role of Laparoscopic Treatment of Choledochal Malformation in Europe: A Single-Center Experience and Review of the Literature
Authors: Schukfeh Nagoud , Abo-Namous Reem , Madadi-Sanjani Omid , Uecker Marie , Petersen Claus , Ure Benno M. , Kuebler Joachim F.
Published: June 2022

Background Numerous studies from Asian countries, including large collectives, have reported excellent results after laparoscopic resection of choledochal malformation (CM). However, the role of laparoscopic CM resection is still controversial outside Asia. We aimed to analyze the outcome of laparoscopic CM resection in our institution and to compare our outcome with the data reported in the literature.

Methods All patients who underwent laparoscopic CM resection in our pediatric surgical department from 2002 to 2019 were retrospectively analyzed for surgical details and postoperative complications, which were graded according to the Clavien–Dindo classification. A systematic literature search identified all reports on over 10 cases of laparoscopic pediatric CM resection and surgical details, follow-up, and complication rates were extracted.

Results Fifty-seven patients (72% female) with a mean age of 3.6 + 4.1 years underwent laparoscopic CM resection in our department. Conversion rate was 30%. Total complication rate was 28%. The rate of major complications (Clavien–Dindo grade III or more) was 16% and included stricture of the biliodigestive or enteric anastomosis (n = 4), adhesive ileus (n = 3), portal vein thrombosis (n = 1), and recurrent cholangitis with consecutive liver transplantation (n = 1). With increasing experience, complication rates decreased. The majority of publications on laparoscopic CM resections originated from Asia (n = 36) and reported on low complication rates. In contrast, publications originating from non-Asian countries (n = 5) reported on higher complications following laparoscopic CM resection.

Conclusion Our data indicate that laparoscopic CM resection can be safely performed. The learning curve in combination with the low incidence calls for a centralization of patients who undergo laparoscopic CM resection. There seems to be a discrepancy on complications rates reported from Asian and non-Asian countries following laparoscopic CM resection.
Surface wettability control on zircaloy-4 by nanosecond Nd:YAG laser with beam homogenizer
Authors: Park Daewoong , Lee Sungyoon , Hwang Seungjin , Lee Geonhui , Jo Hanjin , Cho Seryeyohan , Yu Tae Jun
Published: June 2022

We introduce the laser-induced surface processing (LISP) method that imparts hydrophilicity and hydrophobicity using a Nd:YAG nanosecond laser, especially the high-fluence (HF) condition for fast processing and the low-fluence (LF) condition to control the surface wettability. A prime example of HF processing is laser shock peening, where we show the potential to achieve both strength enhancement and wettability in materials. This could be a new advantageous feature in areas such as reactor maintenance. We combined a beam homogenizer with LISP to increase processing efficiency. The beam homogenizer realizes a uniform fluorescence distribution in the beam area and, at the same time, makes the beam rectangular to increase work efficiency. The maximum contact angle was 123.8° for the zircaloy-4 specimen through HF processing with the beam homogenizer. We also showed that nanosecond laser-induced periodic surface structures could be generated by combining LF processing with specific conditions of a beam homogenizer. This could produce a superhydrophobic surface with contact angles up to 166° on zircaloy-4 or achieve a near superhydrophilic surface with a contact angle of 17.9° depending on the processing conditions.
Giant bipolar unidirectional photomagnetoresistance
Authors: Jiang Yucheng , He Anpeng , Luo Kai , Zhang Jinlei , Liu Guozhen , Zhao Run , Zhang Qing , Wang Zhuo , Zhao Chen , Wang Lin , Qi Yaping , Gao Ju , Loh Kian Ping , Wee Andrew T. S. , Qiu Cheng-Wei
Published: June 2022

Positive magnetoresistance (PMR) and negative magnetoresistance (NMR) describe two opposite responses of resistance induced by a magnetic field. Materials with giant PMR are usually distinct from those with giant NMR due to different physical natures. Here, we report the unusual photomagnetoresistance in the van der Waals heterojunctions of WSe
2
/quasi-two-dimensional electron gas, showing the coexistence of giant PMR and giant NMR. The PMR and NMR reach 1,007.5% at
–
9 T and
–
93.5% at 2.2 T in a single device, respectively. The magnetoresistance spans over two orders of magnitude on inversion of field direction, implying a giant unidirectional magnetoresistance (UMR). By adjusting the thickness of the WSe
2
layer, we achieve the maxima of PMR and NMR, which are 4,900,000% and
–
99.8%, respectively. The unique magnetooptical transport shows the unity of giant UMR, PMR, and NMR, referred to as giant bipolar unidirectional photomagnetoresistance. These features originate from strong out-of-plane spin splitting, magnetic field–enhanced recombination of photocarriers, and the Zeeman effect through our experimental and theoretical investigations. This work offers directions for high-performance light-tunable spintronic devices.NMR)
Archives numériques et mémoire culturelle aux Caraïbes
Authors: Brander Miriam Lay
Published: June 2022

The question of cultural memory is particularly complex in the case of the Caribbean due to its fragmented history, which has led to great cultural diversity. Created within and outside the Caribbean during the last twenty years, structured online archives have taken up the issue of dispersed memories by taking an inventory of a multiplicity of objects which testify to the diverse past of Caribbean societies. Taking Glissant’s concept of Relation as a starting point, I analyze in this article to what extent these archives contribute to the constitution of a cultural memory in terms of contents, structure as well as possibilities of participation, considering the complexity of historical and social threads woven together within and between the Caribbean territories. To address this question, I will draw on two online archives specializing in the Caribbean:The Caribbean Memory Projectand the digital libraryMANIOC.
Personnages écologiques en résistance dans Guérilla de Véronique Bergen
Authors: Ninanne Dominique
Published: June 2022

Guérilla (2019), a multi-voiced novel by the French-language Belgian writer, Véronique Bergen,
raises the question of the current environmental crisis. I shall look at the main characters’ ecological personality: four eco
guerrilleros, a woman, a child and Gaia. Within the theoretical framework developed by Stéphanie Posthumus, which she based on
Félix Guattari’s Ecosophy and three Ecologies (mental, social and environmental), I shall examine the characters’ subjectivity.
Furthermore, I shall resort to the concept of resistance to which Véronique Bergen has dedicated her essay Résistances
philosophiques (2009). I shall highlight the resistant stances adopted by
the characters in their experimentation of subjectivity: the guerilla and the use of violence, the misuse of language, the
building of new alliances with all life forms and the cosmos.
Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base
Authors: Chen Qing Yuan , Liu Fu Rong , Zhang Yong Zhi , Zhang Lu Lu , Lian Yang Bo , Yin Bo Shuo , Ma Quan Long , Rao Kai
Published: June 2022

Structural color technology has garnered extensive attention in the development of ink-free color technology for applications such as color displays, color reflectors, and colorimetric devices. A Fabry–Perot (F–P) structure formed by stacking a metal base, an interference cavity, and a phase change material layer (MIP) is of significant interest as a lithography-free and scalable color-reflecting structure. Such a structure can selectively reflect interfered light over a range of visible wavelengths, resulting in bright colors. However, obtaining a wide range of saturation regulation spaces has become a challenge. In this study, an F–P color reflector based on a phase-change material (PCM) base is proposed, which consists of a PCM base, an interference layer, and a PCM top layer (PIP). The results of the finite element simulation and experimental measurements demonstrated that the PIP reflector had an adjustable saturation range 10.75 times larger than that of the MIP reflector. The effects of the structure size and phase change of the PCM layer on the structural characteristics were further analyzed. In addition, the performance of laser-induced color change and its application in color printing were demonstrated. The present study sheds new light on color reflectors, and the strategy proposed indicates their potential optoelectronic applications based on saturation modulation.
Temporal evolution of scalar modes in Richtmyer–Meshkov instability of inclined interface using high-speed PIV and PLIF measurements at 60 kHz
Authors: Pathikonda Gokul , Petter Samuel J , Wall Isaiah E , Ranjan Devesh
Published: June 2022

The current work presents simultaneous, high-speed measurements at 60,000 fields per second of velocity and mole fraction using particle image velocimetry (PIV) and planar laser induced acetone-fluorescence in a Richtmyer–Meshkov instability of an inclined interface (Atwood number, At = 0.22). Specifically, around 2 ms of temporal evolution of the vortex structures and their associated scalar modes immediately following the interface-reshock interaction is presented. Two initial interface conditions are discussed—(a) a sharp, inclined ‘single mode’ interface and (b) a ‘multi-mode’ interface where small perturbations are imposed on the single mode case. A 2D wavelet decomposition of the scalar flow field shows a highly intermittent distribution of small-scale variance throughout the interface even at late times. These are correlated strongly with the vortex structures and local turbulence intensity, where each small-scale scalar mode is sandwiched between two co-rotating vortex structures. This indicates that the interstitial regions between the vortices are significant hotspots of entrainment, which is then dispersed by the induced, counter-flow velocity fields. The multimode case demonstrates similar organization at large scales, while the scalar field is much more homogeneous at smaller scales. These observations highlight the importance of capturing the early time vortex evolution to accurately estimate any late time intermittency, especially where deposition of intense vorticity on sharp interfaces is present.
Dynamics of the ground hydraulic hammer-pulsator
Authors: Zaripova Liliya M , Gabdrakhimov Mavlitzyan S , Gabdrakhimov Fanil S
Published: June 2022

Various vibration mechanisms are used as vibration exciters for the beneficial use of vibration. By the type of drive, vibration mechanisms are divided into mechanical, electromechanical, hydraulic, pneumatic, vacuum-compression, electromagnetic and magnetostrictive. They are designed to excite forced vibrations that provide the required technological effect. Vibrators and vibrating hammers are currently used for vibration drilling of shallow wells in soft rocks, for vibration-rotating drilling in rocky and semi-rock formations, for driving and removing casing pipes and eliminating accidents associated with stuck drilling at the bottom of the well. The structural scheme of the ground hydraulic hammer-pulsator is designed for drilling seismic wells, the striker of which is a two-stage piston. The piston is connected to the atmosphere; the large piston is for studying the influence of the hydraulic hammer-pulsator on the drilling efficiency is equipped with a valve that closes the channels of the large piston in the upper position, and opens - in the lower position. A schematic diagram of a surface hydraulic hammer is shown to study the effect of a hydraulic hammer-pulsator on the drilling efficiency.
Analysis of the design of ultrasonic electronic generators
Authors: Sultanova Sh A , Safarov J E , Usenov A B , Muminova D
Published: June 2022

The design and operation of electronic generators for ultrasonic intensification of processes in gaseous and liquid media will be considered. General requirements and new approaches to electronic generators have been developed based on the analysis of the characteristics of modern piezoelectric vibration systems that perform large amplitude oscillations (quality factor, multi-frequency, multilayer piezoelectric elements). Continuous monitoring of system parameters and setting of optimal operating modes of the electronic generator were studied.
Using deceptive systems as data sources for a cyber-threat analysis platform
Authors: Gruzeva E R , Guseva E A
Published: June 2022

This article provides an example of the use of deceptive systems as data sources for a cyber threat intelligence platform. The main result is the preliminary verification and enrichment of indicators of compromise (thereby trying to solve the problems of verification of indicators of compromise, IoC).
Dynamic model of a robotic platform with 6 degrees of freedom
Authors: Khurtasenko A V , Chuev K V , Rybak L A
Published: June 2022

The paper presents the study of kinematic and dynamic characteristics of the robotic mobility platform (RMP) to determine inertia-force parameters depending on the nature of the implemented motion path. The method is implemented on the basis of parameterized digital simulation models with parallel kinematics, which allow determining acceleration and force response in the joints of structural components at given geometric parameters of the platform design.
Integrated system for conducting a full-scale experiment in a workshop on robotics and electronics
Authors: Kuznezova A V , Kurileva N L , Korchagin S A , Khasanshin I Ya , Semenov D N , Kruglov V I
Published: June 2022

An integrated information and measurement system is presented, including a personal computer, special software, a set of sensors, and an ADC-DAC. Some possibilities of using modern information technologies in the workshop on robotics and electronics are shown. Several experiments were carried out using a traditional installation and a modified one using modern information technologies
Analysis of possibility to improve the civil marine radar efficiency during navigation in the Arctic waters
Authors: Suslov A N
Published: June 2022

The paper presents the civil marine radar (CMR) efficiency in the polar waters in the case of advanced signal processing based on the optimal filtering of the voltage coming to the intermediate frequency amplifier. The structure of the radar subsystem was modified by adding two complementary filter units that allow to transform the filter frequency response into the almost sinc-function curve providing much better detection of weak radar echoes. The studies have shown that the updated radar matched filter makes it possible for CMR to observe objects with relatively small scattering cross section at the considerably longer distances than up-to-date CMR. Also it is explained that this radar signal processing doesn’t require the increasing of CMR cost which can also be considered as advantage of the method.
Calculated estimation of influence of convection rate of molten working and heating medium during hardening of restored parts
Authors: Buylov V N , Rudik F Ya , Lyulakov I V , Danilin A V , Pavlov A V
Published: June 2022

The paper presents a computational and mathematical assessment of the convection rate of the molten working and heating medium during the strengthening of the restored parts. The calculated estimate is based on the theory of multidimensional heat and mass transfer processes occurring in the electrode furnace during the strengthening of the restored parts. Computational modeling is carried out based on the choice of initial data and characteristics. The calculation results made it possible to establish the effect of the convection rate of the molten working and heating medium on the hardening of the restored parts. The theoretical description of the conditions for the onset of convective motion of a molten continuous medium is based on the Rayleigh–Bénard, Navier–Stokes, and Lorenz equations for the flow of a viscous continuous medium using the Oberbeck-Boussinesq approximation. The description of the internal space of the tank furnace is carried out by a system of differential equations of the balances of elementary volumes into which it is divided. Transformations into a system of differential equations are carried out on the basis of the Galerkin method. The use of this transition method leads to the fact that the sought functions are represented in a variable-separated form that exactly satisfies the boundary conditions. The introduction of assumptions and boundary conditions made it possible to obtain the equations of motion of mass forces and a viscous medium in a polar coordinate system. A formula describing the configuration of the temperature field is obtained.
Calculated substantiation of isolation of boron and sodium cations from molten working and heating medium during hardening of restored parts
Authors: Buylov V N , Rudik F Ya , Lyulakov I V , Makarov S A , Pavlov A V
Published: June 2022

Scientific and technological research in the development of the technical process for the restoration and strengthening of worn parts using calculated justification allowed us to make an optimal technical decision on the development of a method for surfacing and electrolysis borating of parts to increase their service life. The working medium for strengthening the restored tillage organs of agricultural aggregates is substantiated theoretically using the developed mathematical model describing the working medium as a thermodynamic system consisting of boron cations, sodium and oxygen anions. The creation of a potential difference in this medium will provide a process in which boron and sodium ions are discharged at the cathode, and oxygen ions at the anode. For this, it is necessary to theoretically determine the electromotive forces of polarization of electrolytic cells and compare them. The solution to this problem requires an assessment of the change in the Gibbs energy during the decomposition of sodium oxide and boric anhydride for the temperature of the borating process, taking into account its change under standard conditions, the chemical potentials of the reacting components and phase transitions, the melting of substances and their sublimation. The order in which boron and sodium are separated at the cathode is determined by comparing the electromotive forces of polarization of boric anhydride and sodium oxide. It was found that sodium oxide is more stable than boric anhydride. Consequently, boron atoms are reduced on the cathode surface, and calculations have confirmed the possibility of its use.
Study of classification processes of various bulk geomaterials in a hydrodynamic environment using laboratory models of counter-current drum separators
Authors: Lebedev I F
Published: June 2022

The paper presents the results of studying separation processes of various mineral particles of different density in a hydrodynamic (water) environment in three laboratory models of counter-current drum separators with cylindrical, conical and multifaceted drums. Research results have shown that compared to cylindrical and conical drum separators, the multifaceted separator is most effective in separating and refining in a hydrodynamic environment. The high recovery of heavy minerals in the concentrate proves this fact.
Diagnostics and reliability of lithium-ion batteries
Authors: Mizaev M M , Malozyomov B V , Radchenko V O
Published: June 2022

Lithium-ion storage batteries are the most promising direction in the field of energy storage. This article provides an overview of this type of battery. A comparison of the main types of batteries is also provided. The issue of the durability and reliability of batteries is touched upon
Improving the efficiency of reactive power compensation devices through neural analysis
Authors: Zatsepina V I , Shachnev O Ya , Abdulkadyrov U U
Published: June 2022

This article reflects the effectiveness of the use of neural analysis in control systems of powerful devices. The features of neural network modeling in the Matlab Simulink Neural Network Toolbox software package are presented. The state of the neural network in the field of error construction in event of a change in the operating mode of an electrical installation is clearly reflected. The application of the “Adaptive Linear Prediction” function in control systems of reactive power compensation devices is proposed. The positive aspects of the application are indicated, which in combination give a positive economic effect in the field of energy efficiency industrial enterprise.
An approach to arranging primary and secondary control of the operating parameters in microgrids featuring inverter-connected generator sets
Authors: Ilyushin P V , Suslov K V , Kulikov A L
Published: June 2022

Various low-power generator sets (GS) are mainly integrated into microgrids by means of inverters coupled with energy storage systems (ESS). ESSs are connected either to the DC busbars of GSs or to the AC busbars of the microgrid, in this case they are equipped with individual inverters. Use of ESS helps balance power in cases of load surge / loadshedding when the microgrid is islanded. This paper overviews approaches to arranging primary and secondary control of the operating parameters of microgrids. It discusses the technical challenges of, and possible solutions for, implementing primary and secondary control in low- and medium-voltage distribution grids featuring inverter-connected GSs. Calculations of electromechanical transients show that inverter-connected GSs have advantages over conventional GSs when used microgrids that are weakly connected to the power system (the external grid) or islanded. In a microgrid featuring inverter-connected GSs, active and reactive power need to be controlled separately as in power systems featuring conventional GSs; implementation of such controls must be adjusted for the parametric and topological characteristics of low- and medium-voltage distribution grids. To address the issues of linked control, this paper proposes a comprehensive approach that adjusts microgrid design for the specifics of inverter-connected GSs, improves inductance, and incorporates algorithmic solutions. It details upon the virtual impedance algorithm, which extends the common principle of droop speed control. Its implementation helps load the GSs and the ESS with adjustments for their installed capacity; it can also simulate the mechanical constant of GS inertia. Primary control has a low margin that mainly comes from the ESS; thus, backups available to secondary control must be used to compensate for the deviations in operating parameters; this is a key challenge of secondary frequency and voltage control in microgrids. When primary and secondary voltage and frequency controls have been duly implemented in a microgrid, its GSs, the ESS, and electricity delivery to the loads within the microgrid can all operate reliably in a variety of operating situations.
The task of assessing the risk in the operation of a complex free formal system
Authors: Abdullaev Z , Ziyadullaev D Sh , Muhamediyeva D T
Published: June 2022

The article discusses the use of a vaguely defined knowledge base and neural networks for risk assessment when using complex poorly formalized systems. An example of the risk assessment task is the operation of a storage facility for the transport or storage of industrial products. Consideration of a fire with different parameters is required as an anomalous external influence. The storage response, measured by the assessment of the safety of the content and its non-penetration into the external environment, can vary depending on the current state of the system, for example, the degree of possible damage in emergency conditions.
Research of temperature zones during primary processing of silkworm cocoons using a modern thermal imaging camera
Authors: Safarov J E , Sultanova Sh A , Samandarov D I , Zulpanov Sh U , Rakhimov A
Published: June 2022

The article presents the results of studies conducted at the Tashkent State Technical University (based on the research project № F-A-2018-029) to determine the temperature zones in the vibrating infrared dryer using thermal imaging during the primary processing of silkworm cocoons. To ensure a uniform temperature and maintain the quality of the final product, one of the important tasks is to determine the temperature zones at different points of the device and eliminate heat loss in it. On the basis of the obtained results of the study with the help of a thermal imaging device, the drawbacks of the infrared vibrating drying unit associated with the emitters and the flow of heat flow in the primary processing of cocoons were eliminated, and the optimum temperatures were determined and uniform processing of mulberry silkworm cocoons was ensured.
Field oil viscometer and methods for calculating viscosity of water-cut fluids
Authors: Valeev M D , Mingulov I Sh , Mingulov Sh G , Mukhametshin V V , Kuleshova L S , Zinnatullin R R
Published: June 2022

A field oil viscometer is developed and certified for measuring the viscosity of water-cut oil sampled from a well manifold line or a field pipeline. A method is proposed for calculating oil viscosity differing in standard water-cut based on a single well measurement, regardless of the water-cut of a fluid and its temperature. The viscosity of standard water-cut oil is measured when a sampled dry crude oil is degassed to atmospheric value.
Evaluation of enhanced oil recovery efficiency at fields with hard-to-recover reserves
Authors: Khusnutdinova R R , Yusupova L F , Petrova L V
Published: June 2022

The paper discusses measures of enhanced oil recovery of highly watered reservoirs using water-soluble polymer-based systems at Priobskoye oilfield. The application is based on enhanced oil recovery of reservoirs due to decrease of permeability of water channels due to internal formation of insoluble sediments when mixing the solution of alkali with highly mineralized reservoir waters. The study revealed reserves for oil production due to the injection of polymer-alkaline solution.
Research and improvement of statistical prediction methods of efficiency of hydrochloric acid treatments
Authors: Shakurova Al F , Shakurova Ay F
Published: June 2022

The paper studies the apparatus of mathematical statistics for predicting the technological efficiency of hydrochloric acid treatments. The apparatus of mathematical statistics is quite widely used to process the results of measurements of field data, for example, during the assessment of the effectiveness of various methods of oil recovery increase.

As a result, we developed a method to predict the efficiency of the HAT for injection wells using power-law regression equations. With an accuracy satisfactory for field purposes (even in the presence of a sparsely representative sample of actual data), which ensures the prediction of the technological efficiency of production wells in terms of the amount of additional oil production and the value of its duration after the HAT on the adjacent injection wells, it was proposed to use regression equations of the second degree.
Modeling of the converting mechanism of rocking machines
Authors: Khabibullin M Ya , Suleimanov R I
Published: June 2022

The transforming mechanism of rocking machines is an articulated four-link mechanism made following the symmetrical and asymmetrical kinematic schemes. On the straight line passing through the extreme positions of the base of the bolt and the balancing lever, there is a center of rotation of the crank in symmetrical mechanisms. In different variants they are asymmetrical mechanisms. The dimensions of the converting mechanism of Russian symmetrical rocking machines are smaller than foreign asymmetrical rocking machines. This method can be used to show the contrast between technical and operational indicators of the rocking machines manufactured using various kinematic schemes. A contrast of the data multiplied by S
0
K/K
1 with the real data of rocking machines revealed their compliance, which confirms the correctness of the method.
Investigation of magnetocaloric effect in La0.67Sr0.33Mn1-xZrxO3
Authors: Cha Jongchol , Li Fenghua , Jon Jinhyok
Published: June 2022

The influence of Zr-doping on the magnetocaloric effect of La0.67Sr0.33Mn1-xZrxO3 manganese perovskites in low magnetic field has been investigated. Using Hamad’s phenomenological model, we have estimated the important magnetocaloric properties, for example, the thermal magnetization, the change of magnetic entropy and the relative cooling power. We have shown that the magnetocaloric properties decrease as the increase of the dopant amount. Tunable magnetocaloric effect in these compounds is advantageous to magnetic refrigeration applications in wide temperature ranges. Therefore, these compounds are good candidates for working materials in magnetic refrigeration.
Numerical simulation of laser cladding AlCrCuFeNi2 high-entropy alloy coatings
Authors: Zhang Zhiling , Yang Honggang , Chen Yunxia
Published: June 2022

Laser cladding technology is an advanced material surface modification technology, which has the advantages of good combination of coating and substrate, and environmental protection process. In this paper, for the laser cladding of AlCrCuFeNi2 high-entropy alloy coatings, the effects of different laser powers and scanning speeds on the temperature and velocity fields were analyzed by numerical simulation. In the early stage of laser cladding process, heat transfer is dominated by heat conduction, and in the middle and later stages, convection dominates. Compared with the scanning speed, the laser power has a greater influence on the temperature peak inside the molten pool. The research results can provide a reference for the optimization of process parameters of laser cladding high-entropy alloy coatings.
Climate drivers of the variations of vegetation productivity in India
Authors: Verma Akash , Chandel Vikram , Ghosh Subimal
Published: June 2022

Variations in the uptake of atmospheric carbon by vegetation over India, the second-highest contributor to global greening, have enormous implications for climate change mitigation. Global studies conclude that temperature and total water storage (TWS) cause interannual variations of carbon uptake based on the correlation coefficient, which is not a causality measure. Here, we apply a statistically rigorous causality approach, Peter Clark momentary conditional independence, to the monthly observed satellite and station-based gridded dataset of India’s climate and carbon uptake variables. We find no existence of causal connections from TWS to gross primary production (GPP) or net photosynthesis (PSN). Causal relationships exist from precipitation to GPP and PSN. Since shallow-rooted croplands dominate India’s green cover, impacts of precipitation on carbon capture of the the land ecosystem are immediate and not via TWS. Our results identify the key climate drivers of GPP/PSN variability and highlight interactions between water and the carbon cycle in India. Our results also highlight the need for formal causal analysis using climate and earth sciences observations rather than the conventional practices of inferring causality from correlations.
Correlation functions for open XXZ spin 1/2 quantum chains with unparallel boundary magnetic fields
Authors: Niccoli G , Terras V
Published: June 2022

In this paper we continue our derivation of the correlation functions of open quantum spin 1/2 chains with unparallel magnetic fields on the edges; this time for the more involved case of the XXZ spin 1/2 chains. We develop our study in the framework of the quantum separation of variables, which gives us both the complete spectrum characterization and simple scalar product formulae for separate states, including transfer matrix eigenstates. Here, we leave the boundary magnetic field in the first site of the chain completely arbitrary, and we fix the boundary field in the last site N of the chain to be a specific value along the z-direction. This is a natural first choice for the unparallel boundary magnetic fields. We prove that under these special boundary conditions, on the one side, we have a simple enough complete spectrum description in terms of homogeneous Baxter like TQ-equation. On the other side, we prove a simple enough description of the action of a basis of local operators on transfer matrix eigenstates as linear combinations of separate states. Thanks to these results, we achieve our main goal to derive correlation functions for a set of local operators both for the finite and half-infinite chains, with multiple integral formulae in this last case.
Construction of polynomial algebras from intermediate Casimir invariants of Lie algebras
Authors: Latini Danilo , Marquette Ian , Zhang Yao-Zhong
Published: June 2022

We propose a systematic procedure to construct polynomial algebras from intermediate Casimir invariants arising from (semisimple or non-semisimple) Lie algebras

g

. In this approach, we deal with explicit polynomials in the enveloping algebra of

g
⊕
g
⊕
g

. We present explicit examples of low-dimensional Lie algebras (up to dimension six) to show how they can display different behaviours and can lead to abelian algebras, quadratic algebras or more complex structures involving higher order nested commutators. Within this framework, we also demonstrate how virtual copies of the Levi factor of a Levi decomposable Lie algebra can be used as a tool to construct ‘copies’ of polynomial algebras. Different schemes to obtain polynomial algebras associated to algebraic Hamiltonians have been proposed in the literature, among them the use of commutants of various type. The present approach is different and relies on the construction of intermediate Casimir invariants in the enveloping algebra

U

(

g
⊕
g
⊕
g

)

.
Prediction model of low cycle fatigue life of 304 stainless steel based on genetic algorithm optimized BP neural network
Authors: Cao Mengjie , Duan Hongyan , He Hong , Liu Yang , Yue Shunqiang , Zhang Zengwang , Zhao Yingjian
Published: June 2022

The low cycle fatigue life of 304 stainless steel is an essential basis for safety assessment. Usually, there is a complex nonlinear relationship between fatigue life and influencing factors, which is difficult to be predicted by traditional fatigue life models. Based on this, the BP algorithm and genetic optimization algorithm (GA) for the fatigue life prediction problem of 304 stainless steel is proposed. Based on the existing large amount of test data, the fatigue life of 304 stainless steel material is predicted by using BP and GA-BP learning models. The results show that the GA-BP prediction model is more flexible, the correlation coefficient R reaches 0.98158, the prediction data are within the 2 times error limit and closer to the ideal line, and the model prediction is better.
Understanding the changing mechanism of arc characteristics in ultrasound-magnetic field coaxial hybrid gas tungsten arc welding
Authors: CHEN Chao , LI Wenlong , FAN Chenglei , DU Wenbo , ZHANG Huijing
Published: June 2022

Ultrasound-magnetic field coaxial hybrid Gas Tungsten Arc Welding (U-M-GTAW) is proposed as a means to control arc characteristics. The arc characteristics and the mechanism to change them, in an ultrasound-magnetic field coaxial hybrid GTAW, were studied by both experimental and theoretical analyses. The results showed that a periodic rotation and compression of the arc shape were obtained in U-M-GTAW and the arc energy was also enhanced. The most obvious compression of the arc shape in U-M-GTAW was obtained, compared with GTAW, M-GTAW and U-GTAW. At the same time, a periodic rotation of the arc was observed in U-M-GTAW. The geometric parameters of the arc shape in U-M-GTAW are reduced more than double compared with traditional GTAW. The arc voltage in the hybrid GTAW was increased, especially in the U-M-GTAW. The electromagnetic force and acoustic radiation force were the main factors for the change of arc characteristics in the U-M-GTAW.