bluuebunny/crossref_metadata_2025 huggingface dataset:
Facile synthesis of (polyfluoro)alkanesulfinyl 4-isoxazolines: a stepwise solvent- and catalyst-free approach or a one-pot process in water
Authors: Liao Tian-Ming , Ma Wen-Jiang , Gao Yu-Ning , Bian Ming , Jiang Min , Liu Jin-Tao , Chen Hui-Yu , Liu Zhen-Jiang
Published: May 2023

A solvent- and catalyst-free approach and a one-pot process in water were reported for the synthesis of polyfluoroalkanesulfinyl or alkylsulfinyl 4-isoxazolines. These reactions are easy to perform and demonstrate significant ecological advantages.
Techno-economic analysis and life cycle assessment of mixed plastic waste gasification for production of methanol and hydrogen
Authors: Afzal Shaik , Singh Avantika , Nicholson Scott R. , Uekert Taylor , DesVeaux Jason S. , Tan Eric C. D. , Dutta Abhijit , Carpenter Alberta C. , Baldwin Robert M. , Beckham Gregg T.
Published: May 2023

This work examines the feasibility of a greenfield mixed plastics waste gasification facility with process modeling, TEA, and LCA.
Bipotentiostatic tandem electrocatalysis of the CO2 reduction reaction yielding C2+ fuels
Authors: Kim Joo Yeon , Kim Yeonsu , Ryu C. Hyun , Ahn Hyun S.
Published: May 2023

In the Cu–Ag bipotentiostatic CO2RR, C2+ selectivity was improved to 67.3%, including a 6.5% efficiency towards 1-propanol. The system-controlled CO delivery allowed the determination of the C–C coupling turnover frequency of 0.43 ± 0.06 s−1.
Rational design of stable functional metal–organic frameworks
Authors: Chen Zhijie , Kirlikovali Kent O. , Shi Le , Farha Omar K.
Published: May 2023

Reticular chemistry allows for the rational design and synthesis of stable metal–organic frameworks with targeted nets and programmable pores for diverse applications ranging from water capture and catalysis to gas storage and separation.
Development of hierarchical copper sulfide–carbon nanotube (CuS–CNT) composites and utilization of their superior carrier mobility in efficient charge transport towards photodegradation of Rhodamine B under visible light
Authors: Das Mainak , Das Dhananjoy , Sil Sayantan , Ray Partha Pratim
Published: May 2023

Synthesis of copper sulfide nanoparticle carbon nanotube composites (T-CuS) via a solvothermal technique and measurement of its current–voltage characteristics and photocatalytic degradation of RhB in the presence of the T-CuS under visible light.
Identification of potential benzoxazolinones as CYP1B1 inhibitors via molecular docking, dynamics, waterswap, and in vitro analysis
Authors: Raju Baddipadige , Verma Himanshu , Narendra Gera , Kaur Gurleen , Jain Subheet Kumar , Silakari Om
Published: May 2023

In this study, benzoxazolinones were designed as strong CYP1B1 inhibitors using combined molecular docking, molecular dynamics (MD), waterswap, and in vitro enzymatic assay approaches.
Investigations on a mononuclear Cu(ii) Schiff base complex: theoretical calculations, catechol oxidase activity, and protein binding interaction analysis
Authors: Roy Bilash Chandra , Dutta Biswarup , Basak Dipmalya , Debnath Surajit , Ray Debashis , Mahapatra Tufan Singha
Published: May 2023

A new mononuclear Cu(ii) complex has been assessed in detail using experimental and theoretical calculations and explored as a model for catecholase activity and protein binding (BSA & HSA) interaction analysis.
Triple activation of persulfate by a polydopamine/zerovalent iron co-functionalized sponge for synergistic solar driven photocatalytic antibiotic degradation and interfacial evaporation
Authors: Bao Zhonghua , Yang Fei , Pan Zixin , Li Jinying , Liu Yong , Luo Shengxu
Published: May 2023

A self-floating sponge functionalized with polydopamine and zero valent iron is designed for triple activation of persulfate to remove antibiotics from water.
Rh(iii)-catalyzed cascade annulation reaction of N,N-dimethyl enaminones with iodonium ylides to give substituted isocoumarins
Authors: Zhang Mingshuai , Chen Longkun , Liu Donghan , Liu Zhuoyuan , Huang Jiuzhong , Li Xiang , Yu Fuchao
Published: May 2023

A wide variety of isocoumarin derivatives are easily constructed via a Rh(iii)-catalyzed C–H bond activation/annulation cascade reaction.
Band-structure tunability via the modulation of excitons in semiconductor nanostructures: manifestation in photocatalytic fuel generation
Authors: Ghosh Srabanti , Sarkar Dipendu , Bastia Sweta , Chaudhary Yatendra S.
Published: May 2023

Understanding the energetics of electron transfer at the semiconductor interface is crucial for the development of solar harvesting technologies, including photovoltaics, photocatalysis, and solar fuel systems.
Magnetic materials based on heterometallic CrII/III–LnIII complexes
Authors: Shukla Pooja , Das Sourav , Bag Prasenjit , Dey Atanu
Published: May 2023

Exchange interaction plays a pivotal role in dictating the single-molecule magnet (SMM) behaviour in heterometallic complexes. This review covers SMM and magnetocaloric effects of Cr(iii)–Ln(iii)-based heterometallic complexes.
Fluoride counterions boost gold(i) catalysis: case studies for hydrodefluorination and CO2 hydrosilylation
Authors: Yao Yuhang , Hu Jiyun , Liu Guiyu , Meng Yin-Shan , Gao Song , Zhang Jun-Long
Published: May 2023

We reported a prominent counterion effect, where bifluoride synergistically activates hydrosilane to promote the formation of an active gold hydride intermediate, on hydrodefluorination and hydrosilylation of CO2.
Towards cost-efficient and stable perovskite solar cells and modules: utilization of self-assembled monolayers
Authors: Cheng Haoliang , Li Yungui , Zhong Yufei
Published: May 2023

Self-assembled monolayers (SAMs) are wonderful interfacial modification materials for adjusting the energy level and passivating the defects.
Visible-light-mediated C–F bond cleavage for the synthesis of polyfluorinated compounds
Authors: Wang Bin , Wang Cui-Tian , Li Xue-Song , Sun Wen-Hui , Liu Xue-Yuan , Liang Yong-Min
Published: May 2023

Herein, we describe a novel and efficient photo-redox catalytic difluorinated ester radical addition/defluoroalkylation coupling reaction between trifluoroacetic acid derivatives and α-trifluoromethyl alkenes.
Photoluminescence behavior of rare earth doped self-activated phosphors (i.e. niobate and vanadate) and their applications
Authors: Dwivedi A. , Roy A. , Rai S. B.
Published: May 2023

Rare earth doped self-activated phosphors show multimodal behavior applicable in color tunability, spectral converters and security ink.
Synthesis of novel entecavir analogues having 4′-cyano-6′′-fluoromethylenecyclopentene skeletons as an aglycone moiety as highly potent and long-acting anti-hepatitis B virus agent
Authors: Kumamoto Hiroki , Higashi-Kuwata Nobuyo , Hayashi Sanae , Das Debananda , Bulut Haydar , Tokuda Ryoh , Imoto Shuhei , Onitsuka Kengo , Honda Yuka , Odanaka Yuki , Shimbara-Matsubayashi Satoko , Haraguchi Kazuhiro , Tanaka Yasuhito , Mitsuya Hiroaki
Published: May 2023

Encouraged by our recent findings that 4′-cyano-deoxyguanosine (2), entecavir analogues 4 and 5 are highly potent anti-hepatitis B virus (HBV) agents, we designed and synthesized 6 having a hybridized structure of 4 and 5.
Strong attractive interaction between finite element models of twisted cellulose nanofibers by intermeshing of twists
Authors: Uetani Kojiro , Uto Takuya
Published: May 2023

Torsional intermeshing intensifies the attractive interactions between the finite element models of twisted cellulose nanofibers.
Effects of organoclay on colorless and transparent polyimide nanocomposites: thermomechanical properties, morphology, and optical transparency
Authors: Na Yeji , Kwac Lee Ku , Kim Hong Gun , Joo Yong Lak , Chang Jin-Hae
Published: May 2023

SEM images of CPI hybrids containing (a) 0 (pure CPI), (b) 0.25, (c) 0.50, (d) 0.75, and (e) 1.00 wt% CS25A.
Study on ultrasonic leaching and recovery of fluoride from spent cathode carbon of aluminum electrolysis
Authors: Wang Chenchen , Mao Song , Li Longjiang
Published: May 2023

Under the assistance of ultrasound, the fluoride in the spent cathode carbon of aluminum electrolysis was recovered by the process of washing first and then leaching.
In situ growth of TiO2/Ti3C2 MXene Schottky heterojunction as a highly sensitive photoelectrochemical biosensor for DNA detection
Authors: Lai Caiyan , Yan Bingdong , Yuan Run , Chen Delun , Wang Xiaohong , Wang Mingyu , He Heyu , Tu Jinchun
Published: May 2023

In this work, a heterojunction composed of a TiO2 nanosheet and layered Ti3C2 was synthesized by directly growing TiO2 in Ti3C2 MXene.
Experimental and computational insights into the mechanism of the copper(i)-catalysed sulfonylative Suzuki–Miyaura reaction
Authors: Hall Callum G. J. , Sneddon Helen F. , Pogány Peter , Lindsay David M. , Kerr William J.
Published: May 2023

A detailed study into the copper(i)-catalysed sulfonylative Suzuki–Miyaura reaction, using spectroscopic and computational techniques. The study explores key mechanistic steps and side-reactions, including a competing copper(ii)-catalysed mechanism.
Direct measurement of boundary layer thickness on ion-exchange membrane surfaces during reverse electrodialysis
Authors: Li Mei , Xiang Zheyu , Guo Jiabin , Zhang Nianchun , Zheng Hongbo , Li Xiaoliang , Hao Yanmeng
Published: May 2023

The concentration distribution and thickness of the boundary layer on the membrane surface during electrodialysis were studied using the double electrode potential analysis method.
High specific surface area Fe–N–C electrocatalysts for the oxygen reduction reaction synthesized by a hard-template-assisted ball milling strategy
Authors: Sun Feng , Liu Tao , Huang Meihua , Guan Lunhui
Published: May 2023

The single atom Fe–N–C catalyst derived from the ZIF-8 precursor synthesized by a hard-template-assisted ball milling strategy has high specific surface area and shows high ORR activity in acid solutions and 1.5 bar H2–O2at 80 °C.
Solution-processed In2Se3 nanosheets for ultrasensitive and highly selective NO2 gas sensors
Authors: D'Olimpio Gianluca , Galstyan Vardan , Ghica Corneliu , Vorokhta Mykhailo , Istrate Marian Cosmin , Kuo Chia-Nung , Lue Chin Shan , Boukhvalov Danil W. , Comini Elisabetta , Politano Antonio
Published: May 2023

Solution-processed In2Se3 nanosheets exhibit exceptional selectivity and sensitivity to NO2 gas, making them a promising candidate for gas detection systems.
A baby step in assembling and integrating the components of an artificial photosynthesis device with forced heterojunctions towards improved efficiency
Authors: Salgaonkar Kranti N. , Bajpai Himanshu , Mhamane Nitin B. , Nalajala Naresh , Chauhan Inderjeet , Thakkar Kavita , Joshi Kavita , Gopinath Chinnakonda S.
Published: May 2023

The photosynthesis concept is successfully employed to sustainably produce solar fuels/chemicals in direct sunlight.
Quantification of substitutional and interstitial carbon in thin SiGeC films using in-line X-ray-photoelectron spectroscopy
Authors: Vives Jeremy , Verdier Stephane , Deprat Fabien , Frauenrath Marvin , Duru Romain , Juhel Marc , Berthome Gregory , Chaussende Didier
Published: May 2023

Original approach to detect and quantify carbon atoms located in different chemical states in SiGeC films using X-ray photoelectron spectroscopy.
School-Based Speech-Language Pathologists' Engagement With Evidence-Based Practice: An Update With Implications for Implementation Research
Authors: Hall-Mills Shannon , Ireland Marie , Flynn Perry F. , Hoffman LaVae
Published: May 2023

Purpose:

We replicated a prior survey study (Hoffman et al., 2013) to document current evidence-based practice (EBP) patterns as reported by school-based speech-language pathologists (SLPs) during the 2021–2022 school year.

Method:

Via an online survey, SLPs reported their training experiences and needs, workplace resources, and frequency of engagement in EBP activities.

Results:

A total of 889 SLPs in 50 states participated in the survey. Results revealed that 19% of seasoned SLPs (with more than 10 years since last degree) had no formal training in EBP, 22% of SLPs worked in school districts with official EBP procedural guidelines, and 36% had scheduled time in their work week to support EBP activities. Early career (EC) professionals were more likely than seasoned career (SC) professionals to pose and research one or more EBP questions per year and to read journal articles about assessment and treatment. The gap in article use by experience groups was larger than a decade ago. Like prior survey results, the majority of SLPs read zero to four American Speech-Language-Hearing Association (ASHA) journal articles on assessment or intervention per year, with similar results for reading non-ASHA journal articles.

Conclusions:

Although the past decade has fostered some positive increases in the use of EBP resources and engagement in EBP activities, there continues to be a need for additional training and support for school-based SLPs to fully implement EBP. Training and implementation support should account for differences in training preferences and workplace resources and address differentiation of reported practices by EC versus SC professionals. Further implications for implementation science in schools are provided.

Supplemental Material:

https://doi.org/10.23641/asha.23152817
A review of blockchain cross‐chain technology
Authors: Li Li , Wu Jiahao , Cui Wei
Published: May 2023

Along with the continuous breakthroughs and innovations in blockchain technology, various blockchain application scenarios are emerging, such as healthcare, e‐voting, and Internet of Things. However, in general, these applications need to be supported by blockchain systems with different characteristics. Different blockchain systems have significant differences in architecture, security, efficiency, and so on, which makes the exchange of information between applications have certain barriers. Therefore, the research of blockchain cross‐chain technology brings hope for breaking the information barriers between blockchain systems. This paper describes the basic principles and latest research of three mainstream cross‐chain technologies; then analyzes three innovative cross‐chain solutions of cross‐chain routing, smart contracts, and multi‐chain consensus; furthermore, discusses the application and security risks of cross‐chain technologies, and finally summarizes and outlooks on cross‐chain technologies.
A reconfigurable dual‐band low noise amplifier for 5G in 65‐nm CMOS
Authors: Wen Jincai , Yu Meng
Published: May 2023

In this paper, a reconfigurable low noise amplifier (LNA) is proposed for 5G dual‐bands in a 65‐nm CMOS process. The reconfigurable function of LNA is realized by designing reconfigurable matching networks composed of transformers and MOS transistor switches. The pole characteristics of the resonant network composed of the reconfigurable network and the equivalent circuit of the amplifying device are deduced and analyzed in detail. By establishing the relationship between two reconfigurable frequencies and the ratio of transformer coil inductance under two switching states, the position of the switch and the specific parameters of the reconfigurable matching network are determined. Measurement results show small‐signal gain of 25.5 to 33.9 dB and noise figure of 3.3 to 4.3 dB at 24 to 29.5 GHz bands, and small‐signal gain of 23.5 to 27.8 dB and noise figure of 4.3 to 4.5 dB at 37 to 40 GHz bands, respectively. The chip area occupied 0.34 mm2 including pads.
SIW‐backed multiplexing slot antenna for multiple wireless system integration
Authors: Chaturvedi Divya , Kumar Arvind , Althuwayb Ayman A. , Ahmadfard Farnaz
Published: May 2023

In this letter, a planar cavity‐backed multiplexing antenna (SMA) is proposed and validated experimentally. A planar cavity is realized by using a novel transmission line known as substrate‐integrated waveguide (SIW) technology. The design comprises five SIW cavities and each one consisting of a slot for launching the energy in free space. Three different types of slots are employed for lower mutual coupling and compact circuit integration. The individual feeds are created in such a way, that antenna produces five distinct resonant frequencies in the dominant mode while maintaining sufficient mutual port isolation. Finally, the proposed concept is validated with experiments and results show acceptable agreement with the simulated counterparts. The design shows five operating frequency channels with center frequencies of 5.2, 5.5, 5.75, 6.2, and 6.8 GHz. The mutual isolation between any two radiating elements retains below −21 dB and the average gain of the antenna is better than 3.5 dBi at each resonant frequency. The proposed SMA element can be used to cover a wide range of wireless access points and seems suitable for multiple wireless system integration.
Encoding and decoding‐based normalizing flows for image anomaly localization
Authors: Lee Kibae , Ko Guhn Hyeok , Lee Chong Hyun
Published: May 2023

The authors propose encoding and decoding network‐based normalizing flows (EaD‐Flow) for the detection and localization of anomalies in an image. Multiple networks of the EaD‐Flow estimate probability densities of tenor image. The anomaly localization model based on multiple networks shows superior anomaly detection and localization performance.
A rail‐to‐rail regenerative comparator with inverse inverter pre‐amplifier for low supply voltage applications
Authors: Pahlavanzadeh Hadi , Iesakhani Saba , Karami Mohammad Azim
Published: May 2023

In this letter, a new rail‐to‐rail two‐stage regenerative comparator for low supply voltage applications is presented. A rail‐to‐rail operation is achieved by utilizing an inverse inverter pre‐amplifier. The proposed comparator is post‐layout simulated within a standard 180‐nm CMOS technology. In the worst‐case scenario, the energy efficiency and the delay of the comparator are improved by more than 80% compared to the conventional single‐stage comparator.
Magnetic circuit decomposition model and novel inner‐turn fault protection scheme for shunt reactor with auxiliary windings
Authors: Zheng Tao , Tian Haoyu , Meng Lingkun
Published: May 2023

Shunt reactor with auxiliary windings (SRAW) can compensate inductive reactive power for long‐distance transmission lines and supply steady power for low‐voltage devices on offshore platforms. The operation characteristics of SRAW can be commonly described by the air‐core transformer equivalent model. However, this model can only make an approximate simulation of the external characteristics of SRAW, and cannot reflect the actual electrical features inside the SRAW. To solve this problem, the authors propose a three‐segment magnetic circuit equivalent model (TMCEM) of SRAW based on the magnetic circuit decomposition method. This model can accurately describe the coupling relationship inside SRAW and can be used for the analysis of internal fault characteristics. Furthermore, through the fault analysis utilizing TMCEM, a novel protection scheme of SRAW based on virtual magnetizing differential current is proposed for the detection of the inner‐turn fault in SRAW. This protection scheme has high sensitivity and can effectively identify the inner‐turn faults without measuring voltages. By testing the physical model of SRAW, the effectiveness of the TMCEM and the proposed protection scheme against inner‐turn fault has been confirmed.
Direct current (DC) microgrid control in the presence of electrical vehicle/photovoltaic (EV/PV) systems and hybrid energy storage systems: A Case study of grounding and protection issue
Authors: Taheri Behrooz , Shahhoseini Ali
Published: May 2023

In recent years, the interest in using DC microgrids has greatly increased due to their higher efficiency, less complexity, and greater transmission power compared to AC microgrids. To address challenges in DC microgrids in the presence of electrical vehicles (EVs) and the uncertainty of charging EVs, researchers have used PV/EV combination systems with energy storage systems (ESS). Controlling DC microgrids, including PV/EV/ESS, is crucial to cope with the existing challenges. On the other hand, the research on DC microgrids' protection systems is in the early stages, and there are still many challenges in this field. In addition, differences in control systems can pose different challenges for the protection system. The simulation results in this paper demonstrate that considering the best case (use of unipolar resistance grounding system) the DC bus voltage is improved by 22.3% (based on MAPE% data comparison).  In the protection part, the empirical‐mode decomposition (EMD) method and selecting a suitable intrinsic mode functions (IMF) have been used to protect the DC microgrid. The proposed protection method has been tested under pole‐to‐pole and pole‐to‐ground fault conditions. The results show that the proposed method is capable of detecting various fault types in the studied microgrid.
An improved auxiliary circuit for IPT systems to achieve inherent CC‐to‐CV transition and load fault‐tolerant operation
Authors: Ren Sheng , Yang Ping , Wang Xiaoqiang , Xu Jianping
Published: May 2023

Three‐coil inductive power transfer (IPT) charging system can not only achieve inherent constant current (CC) to constant voltage (CV) transition but also tolerate load open‐circuit. However, due to the cross‐coupling between the auxiliary coil and the receiver coil, the output voltage in CV mode may deviate from the CV voltage significantly, which makes the design freedom of the three‐coil coupler low. By replacing the auxiliary coil with a transformer, an improved auxiliary circuit is proposed in this paper to address the cross‐coupling issue and to increase the design freedom of the loosely coupled transformer (LCT). The improved auxiliary circuit can achieve load short‐circuit and open‐circuit protection. Besides, the optimization design of LCT is easy to achieve by load impedance matching. The operating principle and parameters design of the improved auxiliary circuit are discussed. A 1 kW experimental prototype is built to verify the feasibility of the proposed method.
KMT-2021-BLG-1150Lb: Microlensing planet detected through a densely covered planetary-caustic signal
Authors: Han Cheongho , Jung Youn Kil , Bond Ian A. , Gould Andrew , Chung Sun-Ju , Albrow Michael D. , Hwang Kyu-Ha , Ryu Yoon-Hyun , Shin In-Gu , Shvartzvald Yossi , Yang Hongjing , Yee Jennifer C. , Zang Weicheng , Cha Sang-Mok , Kim Doeon , Kim Dong-Jin , Kim Seung-Lee , Lee Chung-Uk , Lee Dong-Joo , Lee Yongseok , Park Byeong-Gon , Pogge Richard W. , Abe Fumio , Barry Richard , Bennett David P. , Bhattacharya Aparna , Fujii Hirosame , Fukui Akihiko , Hamada Ryusei , Hirao Yuki , Ishitani Silva Stela , Itow Yoshitaka , Kirikawa Rintaro , Kondo Iona , Koshimoto Naoki , Matsubara Yutaka , Matsumoto Sho , Miyazaki Shota , Muraki Yasushi , Okamura Arisa , Olmschenk Greg , Ranc Clément , Rattenbury Nicholas J. , Satoh Yuki , Sumi Takahiro , Suzuki Daisuke , Toda Taiga , Tomoyoshi Mio , Tristram Paul J. , Vandorou Aikaterini , Yama Hibiki , Yamashita Kansuke
Published: May 2023

Aims. Recently, there have been reports of various types of degeneracies in the interpretation of planetary signals induced by planetary caustics. In this work we check whether such degeneracies persist in the case of well-covered signals by analyzing the lensing event KMT-2021-BLG-1150, the light curve of which exhibits a densely and continuously covered short-term anomaly.

Methods. In order to identify degenerate solutions, we thoroughly investigated the parameter space by conducting dense grid searches for the lensing parameters. We then checked the severity of the degeneracy among the identified solutions.

Results. We identify a pair of planetary solutions resulting from the well-known inner-outer degeneracy, and find that interpreting the anomaly is not subject to any degeneracy other than the inner-outer degeneracy. The measured parameters of the planet separation (normalized to the Einstein radius) and mass ratio between the lens components are (s, q)in ~ (1.297, 1.10 × 10−3) for the inner solution and (s, q)out ~ (1.242, 1.15 × 10−3) for the outer solution. According to a Bayesian estimation, the lens is a planetary system consisting of a planet with a mass Mp = 0.88−0.36+0.38 Mj and its host with a mass Mh = 0.73−0.30+0.32 M⊙ lying toward the Galactic center at a distance DL = 3.8−1.2+1.3 kpc. By conducting analyses using mock data sets prepared to mimic those obtained with data gaps and under various observational cadences, we find that gaps in data can result in various degenerate solutions, while the observational cadence does not pose a serious degeneracy problem as long as the anomaly feature can be delineated.
CAM model parameterisation methodology and its further unification in Siemens NX environment
Authors: Kravchik Tatyana
Published: May 2023

The paper describes the methodology of mathematical CAD model parameterisation for the subsequent development of the control program (CP) in Siemens NX 2206, which allows in the process of changing the parametric CAD model to adapt not only the 3D model, but also to rebuild the control program, thereby significantly reducing the time for CP development. The application of methods of parametrisation of models in the article is shown in an example of simulators of blades of 3 stages. As a result, a parametric CAD model of the blade simulator, tooling for the product installation on the machine tool, for 3-axis CNC milling machining, automatically changing for each stage of the simulator were developed. A simulator manufacturing process based on the parametric model was developed and successfully implemented. The report formulated the basic provisions and rules for the design of single-type models for the subsequent development of universal control programmes for CNC machines.
Possibilities of using wood and wood materials in the construction of the Republic of Karelia
Authors: Kuzmenkov Alexander , Galaktionov Oleg , Fedorova Anastasia , Emelianova Elena
Published: May 2023

The timber industry complex in the Republic of Karelia is one of the leading industrial complexes in the region. In modern conditions, the timber industry of the republic is experiencing difficulties due to export restrictions on the exportation of manufactured products. The purpose of this study is to assess the potential of the timber industry of the Republic of Karelia and identify the possibilities of using wood and wood materials in construction in the republic and in neighbouring regions of the North-West of the Russian Federation. The data of the Federal State Statistics Service and the Ministry of Natural Resources and Ecology of the Republic of Karelia were used as the main sources of empirical indicators. The methods of economic and mathematical modelling, retrospective and statistical analysis are used as research methods in the article. Based on the results of the analysis, the main directions of wood use in construction in the territory under consideration and in the territory of neighbouring regions are determined. Special attention is paid to the development of enterprises of deep processing of wood and the use of products of a high degree of factory readiness in construction.
Chemical and thermal Properties Properties of compositions based on PAA, PVA and Na-CMS for printing flowers on silk fiber fabrics
Authors: Amonov Mukhtar , Shodiyeva Shoira , Niyozov Erkin , Ismatova Rano , Ganiev Bakhtiyor , Ochilova Nurbibi
Published: May 2023

In the article, the rheological properties of the adhesive-binding systems used in production enterprises and the newly developed polymer systems are studied. In order to determine the thermal stability of the developed systems, a thermal analysis of thickeners with different compositions was carried out. Mass loss was observed in the heating curve of the thickener based on PAA, PVA and Na-CMS. Endothermic effects observed during heating can be caused by physical phenomena such as liquefaction, evaporation, changes in crystal structure, or chemical reactions such as dehydration. The rheological properties of imported sodium alginate, a thickener based on PAA, PVA and Na-CMS, were compared with the properties of the adhesive-binding polymer system with a new composition. It was found that the rheological properties of the proposed new composition thickener are close to the rheological properties of sodium alginate. It was proved during the experiments that the level of thixotropic recovery is especially high in the polymer system with a new composition. When used as an adhesive-binder for silk fiber fabrics with newly developed thickeners, in addition to improving the physical and mechanical properties of the fabric, the wastewater generated at the stage of washing the fabric after flower pressing does not have a negative impact on the environment and the world of living plants.
Interlaminar shifts of two-layer aggressive-resistant combined plates based on metal and fiberglass
Authors: Dusmatov Abdurakhim , Bakhramov Makhmud , Malikov Sayfiddin
Published: May 2023

In this work, the stress and deformation states of plates made of metal layers wrapped with composite materials in the inner or outer layers were studied. The main goal of this research is to create durable, long-lasting and aggressive environment-resistant structures that can easily bear external dynamic and static loads. The work used the Navier method to study the effects of interlayer displacement. It was found that the lower the modulus, the greater the effect of joint compliance on the deformation of laminated composite plates. A regularity has been established that the greater the thickness of the bearing fiberglass layer, the less the effect of the shear modulus of the seam on the stresses and deformability of two-layer combined slabs. A regularity has been established, the greater the thickness of the bearing metal layer, the less the effect of the shear modulus of the seam on the stresses and deformation of two-layer combined plates.
Effect of elevated temperature on critical load in stability tests of the steel plate
Authors: Alexandrova Yu.P. , Suvorova E.V.
Published: May 2023

This paper presents the results of a study on the effect of epoxypolyester based powder coatings on the critical strength of plate specimens made of rolled steel sheets. The results show that the model using planar elements gives more accurate results than the model using three-dimensional elements. The best agreement with experiment was obtained with Ansys results using Eigenvalue bucling, less than 1%. The lowest experimental agreement was with the results obtained in Ansys using solid elements, about 70%.
Issues of investigation of the dependence of static characteristics of magnetoelastic converters of mechanical quantities on the influence of external
Authors: Jurayeva Kamila , Sattarov Khurshid
Published: May 2023

The article presents the results of a study of the magnetic permeability and the magnetostriction coefficient of a magnetoelastic material on temperature, tensile forces, as well as the dependence of sensitivity to a large extent on the absence of joints in the design of a magnetoelastic transducer (MT). Analytical and graphical expressions of the dependences of the magnetic permeability and the magnetostriction coefficient on the tensile force are given.
Evaluation of the effectiveness of the use of additive wax printing technologies for obtaining wax models for lost-wax casting in custom production based on simulation modeling
Authors: Dolgov Nikita , Akimov Artem , Nikishechkin Petr
Published: May 2023

The article discusses the technology of casting according to the smelted models, in particular, the processes of manufacturing wax models. We considered methods of manufacturing elements of model blocks with the use of molds and with the help of additive technologies. In this paper we showed the features of the application of additive technologies in the lost-wax casting. A simulation model has been developed to evaluate the effectiveness of using additive wax printing technologies to produce wax models. Based on the results of simulation modeling, conclusions were made about the feasibility of using additive technologies in casting according to smelted models.
Retracted Article: Technological equipment layout of the self-propelled vehicle for mobile ropeway with terminal fixation
Authors: Scherbakov Alexander , Pushkarev Alexandr , Kuzmin Oleg , Vinogradova Tamara , Petrov Andrey
Published: May 2023

This paper has been formally retracted on ethical grounds because the article contains
extensive and repeated instances of plagiarism. The authors are responsible for this
mistake and apologise for it. Request approved by the proceedings Editor and the
Publisher on September 13, 2023.
Experimental determination of the tightening coefficient of bolts according to the din standard
Authors: Vasilkin Andrey , Akhmetzyanov Roman , Zubkov Georgiy , Vasilkin Ilya
Published: May 2023

The use of slip-critical connections is very common in the design of critical steel structures and is seen as an effective way to transfer the force in conditions of dynamic loading. The limit state of the connection occurs when the calculated shear stress is reached, which depends on the friction coefficient of the contact planes and the value of the clamping force, equal to the bolt tension stress. In order to ensure the necessary bolt tensioning force, it is necessary to know the bolt tightening coefficient, because according to the current understanding of the slip-critical connection performance, the designed functioning of the bolt connection is ensured when the bolt tensioning force arising at the necessary torque value is achieved. Otherwise, the actual work of the connection will be different from the calculated, because only a given tension force provides the estimated bearing capacity of the bolted connection with friction planes. This article focuses on tensile testing of a bolt and determining the tightening factor of a bolt made of high-strength10.9 M14 steel. The tightening factor is determined with strain gauges by measuring the relative strain of the bolt when the nut is tightened. This method requires specialized equipment and a test bench and can be used in the study of bolt performance in the absence of a certificate or the need to verify or clarify the available data. The results show that the proposed method can provide a stable determination of the coefficient value. The examined bolts were made according to the German standard DIN931, strength 10.9 size M14x220, nuts according to the German standard DIN934, strength 10 size M14. An Instron 1000HDX tensile testing machine was used to plot the performance of the bolt steel. Nut tension control was determined with the use of NOGRAU NTW24-034R torque wrench, and bolt elongation control with FLA 5-11 strain gauges and National Instruments data acquisition system. On the basis of the conducted research, a method for determining the tightening factor of high-strength bolts has been tested and proposed. The proposed method of determining the tightening factor of a high-strength bolt can be used in research work and allows to determine the coefficient in the absence of an appropriate certificate or the need to clarify (verify) the stated value of the coefficient.
Automated systems for monitoring microclimate parameters and electricity metering of an experimental building
Authors: Kaychenov A. , Lukin S. , Yarotskaya A. , Selyakov I. , Ereschenko V. , Kuzmenkov A. , Karachentseva I.
Published: May 2023

The Arctic is a strategically important region for Russia. In the process of searching for new solutions for the rapid construction of energy-efficient and safe buildings in the Arctic, it is necessary to develop systems for monitoring and maintaining indoor microclimate, ensuring optimal use of resources and implementing building management systems. Continuous automatic monitoring will help to increase comfort and safety in the room, as well as reduce energy consumption. The possibility of remote data transmission will allow you to quickly respond to emergencies and take actions to prevent the development of accidents. The article presents the results of the development and testing of a software and hardware complex based on a model object on the territory of the Murmansk State Technical University. The development and research of systems for automated monitoring of microclimate parameters and electricity metering of a model object in Murmansk has been carried out. The results of the study of the parameters of the deviation of temperature indicators are presented. The parameters of the deviation of the indicators of the humidity control system from the sensors are determined. A comparative analysis of the total electricity consumption of the model object for the main consumers of the log part and the frame part was carried out.
GPR results for indicating layers of snow strata
Authors: Sidorenko A.I. , Bobrova D.A.
Published: May 2023

The authors of this article describe the results of GPR tests for indicating the layers of snow strata and determining their properties, allowing for forecasting of avalanche hazards. The GPR tests were carried out during the winter season 2021/2022. Trenches were dug in the snow, in the wall of which long metal rods (markers) were installed, which are the reflectors for the GPR and make it possible to distinguish the boundaries of layers on the radarogram. As a result of conducting GPR sounding of the snow cover, radarograms were obtained, on which the layered structure of snow can be read. Using the GeoScan32 software, dielectric permittivity values were obtained for 19 layers of snow strata with different properties. Correlations were obtained between dielectric permittivity and temperature, crystal diameter, snow layer density, and snow layer water storage. The resulting dielectric permittivity relationships reveal the strongest correlations between dielectric permittivity and density, with a higher correlation coefficient for dry snow than for wet snow. The values of dielectric permittivity obtained from GPR were also compared with calculated values derived from a number of empirical correlations with snow density.
Simulation of sea surface elevations by the Edgeworth distribution
Authors: Shumeyko Irina , Burdyugov Vyacheslav , Abramovich Alexandra
Published: May 2023

The possibility of reliable monitoring of processes occurring near the ocean-atmosphere boundary is determined by how fully and correctly the geometric structure of the sea surface is described. The paper analyzes the possibilities of approximating the probability density function (PDF) of sea surface elevations by truncated Edgeworth series. The possibility of increasing the truncation order by using a regression equation linking the third and fifth statistical moments is considered. It is shown that the Edgeworth distribution, as well as the Gram-Charlier distribution, allows us to correctly describe PDF only in a limited region the width of which approximately corresponds to 1.25 significant wave height.
Forest machine automation and ergonomics
Authors: Sokolov Anton , Seliverstov Alexander , Sukhanov Yuri
Published: May 2023

Harvesters and forwarders are the main part of cut-to-length logging system equipment. The perfection of the hydraulic cranes has a very large impact on the overall operating efficiency of these forest machines. The impact of the crane partial automation on the operator’s work cycle and workload is described in this article. Two machines were studied in field conditions. Differences in the frequency and duration of telescopic extension boom control activations were identified. It was determined that, as a result of automation, one of the degrees of freedom of the crane controls is almost completely excluded from use in the case of the forwarder. A significant reduction in the duration of its use is observed in the case of the harvester. As a result, this saves the psycho-physiological resources of the operator for more efficient use of the remaining degrees of freedom, which, coupled with a simpler and more intuitive logic of the controls operation, improves the productivity, accuracy and safety of cut-to-length logging. In addition, a simpler work algorithm reduces the level of stereotyping of the operator’s actions, fatigue and loss of attention, which usually emerge at the end of the shift. This work was supported by the Russian Federation Ministry of Science and Higher Education (state research target, theme no. 075-03-2023-128).
Distribution of new varieties of grain crops suitable for the natural climatic conditions of Uzbekistan
Authors: Haitov Jahongir
Published: May 2023

This article examines the issues of the history of the dissemination of new varieties of grain crops in the region of Uzbekistan through the analysis of articles and literature. The article also provides a comparative analysis of the history of the cultivation of grain crops during the years of the Russian Empire, Soviet power and independence.
Studies of removing copper ions from water with the seed coats of grain crops
Authors: Stepanova Svetlana , Alekseeva Anna , Suntsova Maria
Published: May 2023

This paper presents the studies of sorbing copper ions in simulated water with the seed coats of barley, wheat, and oat grains. Isotherms were built for the Cu2+ sorption at the initial concentrations of 0.315-62.947 mmol/dm3. It is shown that the sorption isotherms of all grain samples correspond with IUPAC 1b and are described by Langmuir equation with the confidence degree of 0.999. It is also shown that sorption runs intensively at the initial contaminant concentration ranging from 0.315 mmol/dm3 through 15.737 mmol/dm3, while the sorption rate observed decreases significantly at the concentration exceeding 15.737 mmol/dm3, which works out to 1,000 mg/dm3. The sorption isotherms built is indicative of monomolecular adsorption running.
Effect of using repeated and siderate crops on soil fertility, yield of cotton varieties, and technological quality indicators of cotton fiber in short rotation cropping systems
Authors: Iminov Abduvali , Ulugov Chorshanbi , Kholturaev Sharofiddin , Togayeva Sarvinoz
Published: May 2023

In the 1:1 (cotton:grain) system of short-rotation, soybean, bean, mung bean crops were harvested as a repeat crop after winter wheat. Their stem crop and mixed siderate crops (perco, oats, green peas) were planted in the second half of August, and the blue mass crop grown in October-November was harvested for livestock. The lower 15-20 cm part of the stem was plowed under the plow as a blue manure, at the end of one rotation, the amount of organic carbon in the soil increased by 0.041-0.073%, and the total nitrogen content by 0.012-0.016% compared to the initial values. The highest rate of dry mass accumulation of cotton was observed when using short-row rotation 1:1, winter wheat + mixed siderate crops (perco, oat, green pea):cotton system. The dry mass of the leaves of the Navroz variety of cotton was 22.6 g, the dry mass of the stem was 33.4 g, the dry mass of the bolls was 18.5 g, and the dry mass of the cotton was 48.0 g. The total dry mass of 1 plant was equal to 122.5 g. In the 1:1 (cotton:grain) system of short-rotation, when cotton was grown as a repeat crop after legume-cereal (soybean, mung bean) and mixed siderate (perco, oat, green pea) crops, it provided a higher and better quality cotton yield. Cotton yield was 3.2-5.8 tons/ha, fiber output was 1.0-1.5 percent, and 1000 seed mass was 9.0-11.0 g/ha. Besides, the length of the fiber was found to be higher by 1.4-2.0 mm.
Prospects for the training development of qualified personnel in the agricultural education system: a case study from Tashkent State Agrarian University, Uzbekistan
Authors: Toshboev Abduraim , Ziddikov Zohid , Boltaev Nurali
Published: May 2023

Development, implementation, and achievement of the desired results of Uzbekistan's stable progress and development of reforms are directly related to the professional personnel who organize these processes and their knowledge of innovative management. Because the correct determination of the directions of the reforms and the results to be achieved requires such qualities as high knowledge, potential, and professional skills from the specialist personnel. In addition, it is important to properly organize personnel management in every enterprise and organization in every field, direction, and place the most qualified personnel with the necessary knowledge and potential in every job. An important aspect of econometric analysis is that it is an analysis based on the assessment of the effects of factors that have an indirect, but not direct, effect on the change in the outcome variable. That is, in our analysis, if we define the indicator of employment of graduates as a result, the factors that indirectly influence its change are the scientific potential of teachers, the degree to which the institution where the graduate is trained is compatible with practice, the level of scientific research in the educational institution, education in harmony with international experiences. Factors such as have an indirect effect. In this article, medium-term forecast indicators of the level of employment of graduates in the training of agricultural educational institutions in the period of 2022-2027 have been developed. Also, the main directions of introduction of market mechanisms in effective management of agrarian education system are highlighted in the article.
Experience of development of digital technologies in Uzbekistan
Authors: Gulyamov Saidasror , Karieva Gulnora , Rasulova Muhabbat
Published: May 2023

The Republic of Uzbekistan made the digitalization and development of information-communication technologies (ICT) priority yet in early 2000s. For the digital strategy determines out five priority areas for development: digital infrastructure; e-government; digital economy; national IT sector; and IT education. Moreover, digital and IT infrastructure of the country has remarkably improved, considerable amount of resources were invested which built solid foundations for better ecosystem of the ICT. Meanwhile, Uzbekistan has achieved visible results in the sphere of digitalization and ICT development in a relatively short period of time. The great progress has been observed in introducing e-government and ICT in public sector for the last few years, when in 2013 was launched “Single portal of interactive government services” – central e-government service of the country. This article is devoted to the information on the basic principles of the digital economy, increasing efficiency and creating “digital enterprises” as well as information and other high technologies have become an integral part of everyday life, almost the entire world population in Uzbekistan. In this regard, it studies the digitalization process, stimulating economic growth and its opportunities for achieving various social goals, including in the labor market.
Dominance of tree species of pest insects in forest biocenosis
Authors: Rakhimova Aziza , Esanbaev Shamsi
Published: May 2023

This article studied to determine the damage to ornamental and fruit trees caused by Yponomeuta malinellus Zell., Laspeyresia pomonella L., Erschoviella musculana Ersch., Recarvаria nаnella Schif., Aporia crataeqi L., Сossus-cossus L. belonging to the Lepidoptera family in agricultural crops and forests. Sesia apiformis and Paranthrene tabanifonnis Rott. were also identified by occurrence and tree species in forest areas. In the course of research, in 2019-2020, research was carried out on the study of the pest Synanthedon myopaeformis from the pests of Tashkent and Andijan forest farms. According to the results, in 2019, in Bostonliq, Qibray, Ghazalkent districts of Tashkent province of Uzbekistan, the level of pest occurrence in wild apple trees was 16%, and in 2020, this indicator reached 19%, and in the forest biocenosis of Andijan province, the occurrence of apple borer was 21% in 2019, in the observations of 2020 and it was determined that it reached 23%.