bluuebunny/crossref_metadata_2025 huggingface dataset:
Distinct nonlinear optical responses in three pairs of 2D homochiral Ag(i) enantiomers modulated by dicarboxylic acid ligands
Authors: Gao Congli , Zhou Jianya , Cui Minghui , Chen Diming , Zhou Liming , Li Fengcai , Li Xi-Li
Published: November 2021

Based on three pairs of 2D homochiral Ag(i) enantiomers, we demonstrate that both the symmetry and degree of π-conjugation of the ligands have a significant effect on the type and intensity of their NLO responses.
Efficient enantioselective synthesis of CF2H-containing dispiro[benzo[b]thiophene-oxindole-pyrrolidine]s via organocatalytic cycloaddition
Authors: Deng Yabo , Li Yongzhen , Wang Yalan , Sun Shuo , Ma Sichao , Jia Pengfei , Li Wenguang , Wang Kairong , Yan Wenjin
Published: November 2021

A novel kind of CF2H-containing dispiro[benzo[b]thiophene-oxindole-pyrrolidine] has been achieved via an organocatalyzed 1,3-dipole reaction.
Physicochemical, morpho-structural, and biological characterization of polysaccharides from three Polygonatum spp
Authors: Bai Jin-Bo , Ge Ji-Chun , Zhang Wang-Juan , Liu Wang , Luo Jian-Ping , Xu Feng-Qing , Wu De-Ling , Xie Song-Zi
Published: November 2021

Three Polygonatum polysaccharides with different physicochemical properties exert distinct effects on free radical-scavenging abilities and the promotion of M1 macrophage polarization, while they have similar effects on GLP-1 secretion.
Recent applications of solid-phase strategy in total synthesis of antibiotics
Authors: Zhou Yuxin , Liang Xiao-Wei
Published: November 2021

The recent applications of solid-phase strategy in total synthesis of antibiotics were summarized, and the structure–activity relationship could be established to conquer the challenge of bacterial resistance preparedness.
Total synthesis and mechanism of action of the antibiotic armeniaspirol A
Authors: Arisetti Nanaji , Fuchs Hazel L. S. , Coetzee Janetta , Orozco Manuel , Ruppelt Dominik , Bauer Armin , Heimann Dominik , Kuhnert Eric , Bhamidimarri Satya P. , Bafna Jayesh A. , Hinkelmann Bettina , Eckel Konstantin , Sieber Stephan A. , Müller Peter P. , Herrmann Jennifer , Müller Rolf , Winterhalter Mathias , Steinem Claudia , Brönstrup Mark
Published: November 2021

The antibiotic armeniaspirol A depolarized bacterial and mammalian cell membranes through a protonophore activity, that accounts for its potent antibiotic effects. A total synthesis of (±) armeniaspirol A was achieved in six steps.
Structural resolution and mechanistic insight into hydrogen adsorption in flexible ZIF-7
Authors: Klein Ryan A. , Shulda Sarah , Parilla Philip A. , Le Magueres Pierre , Richardson Rachelle K. , Morris William , Brown Craig M. , McGuirk C. Michael
Published: November 2021

Hydrogen induced flexibility in MOFs can be leveraged to increase useable gas storage capacities. Here hydrogen adsorption isothermal and in situ powder neutron diffraction measurements combine to reveal the mechanism driving flexibility in ZIF-7.
Carbon dioxide to bio-oil in a bioelectrochemical system-assisted microalgae biorefinery process
Authors: Bolognesi Silvia , Bañeras Lluís , Perona-Vico Elisabet , Capodaglio Andrea G. , Balaguer Maria Dolors , Puig Sebastià
Published: November 2021

A novel biorefinery approach, combining microbial electrosynthesis and heterotrophic microalgae, aimed at producing a biodiesel compatible oil from CO2.
Recent progress in quantum dots based nanocomposite electrodes for rechargeable monovalent metal-ion and lithium metal batteries
Authors: Puttaswamy Rangaswamy , Pai Ranjith Krishna , Ghosh Debasis
Published: November 2021

This review summarizes the recent progress in quantum dot based nanocomposites as electrode materials in Li/Na/K-ion batteries, as cathodes in Li–S and Li–O2 batteries and in improving the electrochemical performance of Li metal anode batteries.
A novel Y-shaped photoiniferter used for the construction of polydimethylsiloxane surfaces with antibacterial and antifouling properties
Authors: Sun Wei , Liu Jingrui , Hao Qing , Lu Kunyan , Wu Zhaoqiang , Chen Hong
Published: November 2021

Dual-functional polydimethylsiloxane (PDMS) surfaces with antibacterial and antifouling properties were conveniently developed via a novel Y-shaped photoiniferter (Y-iniferter).
Morphology, size, and defect engineering in CeOHCO3 hierarchical structures for ultra-wide band microwave absorption
Authors: Wei Haiyan , Wang Xinxin , Tong Guoxiu , Fan BaoXin , Wang Xiaojuan , Wu Wenhua
Published: November 2021

CeOHCO3 hierarchical structures with tunable size and defects were synthesized via a simple and rapid microwave-assisted hydrothermal approach for ultra-wide band microwave absorption for the first time.
Recent progress in open-shell organic conjugated materials and their aggregated states
Authors: Dong Shaoqiang , Li Zhen
Published: November 2021

In this review, we first summarize the general synthetic strategies towards stable open-shell organic conjugated materials, and then focus on their special aggregated states in OFETs, organic conductors, OLEDs and photoinduced radical materials.
Tutorial on Clinical Practice for Use of the Fiberoptic Endoscopic Evaluation of Swallowing Procedure With Adult Populations: Part 1
Authors: Langmore Susan E. , Scarborough Donna R. , Kelchner Lisa N. , Swigert Nancy B. , Murray Joseph , Reece Selena , Cavanagh Trish , Harrigan Leah C. , Scheel Rebecca , Gosa Memorie M. , Rule Denise K.
Published: November 2021

Purpose:

Representatives of the American Board of Swallowing and Swallowing Disorders (AB-SSD) and American Speech-Language-Hearing Association (ASHA) Special Interest Group (SIG) 13: Swallowing and Swallowing Disorders (Dysphagia) developed this tutorial to identify and recommend best practice guidelines for speech-language pathologists who conduct and interpret fiberoptic endoscopic evaluation of swallowing (FEES) procedures in adults. This document also includes proposed training needs and methods for achieving competency. Expert opinion is provided regarding indications for performing the FEES exam, potential contraindications, adverse effects and safety, equipment and personal protection, the exam protocol, interpretation and documentation of findings, and training requirements to perform and interpret the exam.

Conclusions:

This tutorial by the AB-SSD and SIG 13 represents the first update about the FEES procedure since ASHA's position paper and technical report published in 2004. Creation of this document by members of the AB-SSD and SIG 13 is intended to guide professionals who are training for or practicing FEES in the adult population toward established best practices and the highest standards of care.
Comprehensive Review of Machine Learning (ML) in Image Defogging: Taxonomy of Concepts, Scenes, Feature Extraction, and Classification techniques
Authors: Arif Zainab Hussein , Mahmoud Moamin A. , Abdulkareem Karrar Hameed , Mohammed Mazin Abed , Al‐Mhiqani Mohammed Nasser , Mutlag Ammar Awad , Damaševičius Robertas
Published: November 2021

Images captured through a visual sensory system are degraded in a foggy scene, which negatively influences recognition, tracking, and detection of targets. Efficient tools are needed to detect, pre‐process, and enhance foggy scenes. Machine learning (ML) has a significant role in image defogging domain for tackling adverse issues. Unfortunately, regardless of contributions that were made by ML, little attention has been attributed to this topic. This paper summarizes the role of ML methods and relevant aspects in the image defogging research area. Also, the basic terms and concepts are highlighted in image defogging topic. Feature extraction approaches with a summary of advantages and disadvantages are described. ML algorithms are also summarized that have been used for applications related to image defogging, that is, image denoising, image quality assessment, image segmentation, and foggy image classification. Open datasets are also discussed. Finally, the existing problems of the image defogging domain in general and, specifically related to ML which need to be further studied are discussed. To the best knowledge, this the first review paper which sheds a light on the role of ML and relevant aspects in the image defogging domain.
CT2‐MDS: Cooperative trust‐aware tolerant misbehaviour detection system for connected and automated vehicles
Authors: Liu Ying , Xue Hongwei , Zhuang Weichao , Wang Fa'an , Xu Liwei , Yin Guodong
Published: November 2021

Connected and automated vehicles (CAVs) are recognized as a promising solution to improve road safety. Before deploying CAVs, securing the communication environment is a critical challenge. To secure the exchanged sensitive messages between CAVs, a novel cooperative trust‐aware tolerant misbehaviour detection system (CT2‐MDS) is proposed in this paper. The vehicle‐to‐everything (V2X) network model in real complex scenarios is built first, and several typical types of attacks are simulated. The cooperative trust factor is then defined to evaluate the received message packet's plausibility instead of the node. And the measuring uncertainty of sensors is considered to improve the overall detection precision. At last, a multi‐model fusion misbehaviour detection method is presented based on the idea of cross‐validation. In this mechanism, different from the binary classification, the misbehaviour messages are categorized into particular misbehaving classes. To verify the proposed system's performance, the simulation is conducted, and the results showed that the proposed method outperformed existing single classifiers and provided good prediction accuracy in different attack density.
A distributed trajectory control strategy for the connected automated vehicle in an isolated roundabout
Authors: Wu Ruiyi , Jia Hongfei , Yang Lili , Miao Hongzhi , Lin Yu , Zhang Yikun
Published: November 2021

This paper develops a distributed cooperative control strategy (DCCS) to plan and optimize the collision‐free trajectory for the connected automated vehicle (CAV) at an isolated roundabout. The representation of the trajectories of CAVs is defined within a roundabout. The central angle and lane radius are used to indicate the location of vehicles, and the corresponding angular velocity is used to describe the vehicle's speed through the roundabout. This trajectory definition method simplifies the proposed problem into two parts: the trajectory optimization of each vehicle in a specific lane and the lane change coordination of CAVs in the roundabout. To solve the trajectory optimization problem, a mixed‐integer linear programming (MILP) model is formulated at the vehicle level to minimize the travel time and make the trajectory as smooth as possible. A model predictive control (MPC) framework is designed to coordinate lane‐change conflicts and push CAVs’ trajectories toward global optimization. The proposed framework integrates the vehicles’ trajectory optimization results so that all CAVs reach a consensus. Numerical experiments test the effect of the strategy in terms of traffic efficiency and mobility performance under different demand pattern scenarios. The results show that the proposed RA‐DCCS (Roundabout‐DCCS) can make all CAVs smooth and conflict‐free trajectories and enable vehicles to execute reasonable lane change decisions.
Model predictive direct power control scheme for Vienna rectifier with constant switching frequency
Authors: Dang Chaoliang , Wang Fei , Liu Ding , Tong Xiangqian , Song Weizhang , Pat Wheeler
Published: November 2021

Model predictive direct power control (MPDPC) has strong robustness and fast dynamic response, so it is widely applied in the control system of grid‐connected converter. However, the traditional FCS‐MPC bears with variable switching state, which will reduce the current tracking accuracy, accidentally produce current ripple and electromagnetic noise. Here, a double closed‐loop control strategy with constant switching frequency based on optimal switching sequence synthesis of model predictive direct power control (MPDPC‐CF) in the inner loop and SMC control in the outer loop is proposed for the non‐linear system of Vienna rectifier. Firstly, the Vienna rectifier is modelled to obtain the predicted values of input power. Then, the given values of active power and reactive power are obtained through the outer loop. Three adjacent voltage vectors with the lowest cost function in the sector are selected to synthesize the optimal voltage vector, and the pulse time of the corresponding vector is calculated according to the cost function of the voltage vector. To verify the correctness of the theoretical analysis, the Vienna rectifier is taken as the research object, and the comparison with the traditional MPDPC shows that the proposed constant frequency model predictive control has good steadystate and dynamic performance.
Optimal low‐carbon scheduling of integrated local energy system considering oxygen‐enriched combustion plant and generalized energy storages
Authors: Chen Changming , Wu Xiaogang , Ma Jien , Chen Yuge , Liu Shengyuan , Wu Xinhua , Ji Qingfeng , Ye Jieyang , Yang Li , Lin Zhenzhi
Published: November 2021

Under the background of carbon neutrality and large‐scale penetration of renewable energy, the integrated local energy system (ILES) has been extensively recognized as an effective way to reduce carbon emissions and improve renewable energy consumption level due to its high energy utilization and multiple energy complementarity. Hence, an optimal low‐carbon scheduling model of ILES considering oxygen‐enriched combustion plant (OECP) and generalized energy storages (GESs) is proposed in this paper to reduce the carbon emissions, improve the renewable energy consumption level and reduce the operating costs of ILES. More specifically, the cooperation mechanism between OECP and power to gas (P2G) is established to maintain a high carbon capture level during peak load periods; the GESs under the background of ILES is modelled, which can make full use of the multiple energy complementarity to improve the renewable energy consumption level of ILES. Case studies are performed on an IES that consists of an IEEE 33‐bus distribution network, a 44‐node district heating network and a 20‐node natural gas network to verify the effectiveness and advantages of the proposed model.
Multi-frequency point source detection with fully convolutional networks: Performance in realistic microwave sky simulations
Authors: Casas J. M. , González-Nuevo J. , Bonavera L. , Herranz D. , Suarez Gomez S. L. , Cueli M. M. , Crespo D. , Santos J. D. , Sánchez M. L. , Sánchez-Lasheras F. , de Cos F. J.
Published: November 2021

Context.Point source (PS) detection is an important issue for future cosmic microwave background (CMB) experiments since they are one of the main contaminants to the recovery of CMB signal on small scales. Improving its multi-frequency detection would allow us to take into account valuable information otherwise neglected when extracting PS using a channel-by-channel approach.

Aims.We aim to develop an artificial intelligence method based on fully convolutional neural networks to detect PS in multi-frequency realistic simulations and compare its performance against one of the most popular multi-frequency PS detection methods, the matrix filters. The frequencies used in our analysis are 143, 217, and 353 GHz, and we imposed a Galactic cut of 30°.

Methods.We produced multi-frequency realistic simulations of the sky by adding contaminating signals to the PS maps as the CMB, the cosmic infrared background, the Galactic thermal emission, the thermal Sunyaev-Zel’dovich effect, and the instrumental and PS shot noises. These simulations were used to train two neural networks called flat and spectral MultiPoSeIDoNs. The first one considers PS with a flat spectrum, and the second one is more realistic and general because it takes into account the spectral behaviour of the PS. Then, we compared the performance on reliability, completeness, and flux density estimation accuracy for both MultiPoSeIDoNs and the matrix filters.

Results.Using a flux detection limit of 60 mJy, MultiPoSeIDoN successfully recovered PS reaching the 90% completeness level at 58 mJy for the flat case, and at 79, 71, and 60 mJy for the spectral case at 143, 217, and 353 GHz, respectively. The matrix filters reach the 90% completeness level at 84, 79, and 123 mJy. To reduce the number of spurious sources, we used a safer 4σflux density detection limit for the matrix filters, the same as was used in thePlanckcatalogues, obtaining the 90% of completeness level at 113, 92, and 398 mJy. In all cases, MultiPoSeIDoN obtains a much lower number of spurious sources with respect to the filtering method. The recovering of the flux density of the detections, attending to the results on photometry, is better for the neural networks, which have a relative error of 10% above 100 mJy for the three frequencies, while the filter obtains a 10% relative error above 150 mJy for 143 and 217 GHz, and above 200 mJy for 353 GHz.

Conclusions.Based on the results, neural networks are the perfect candidates to substitute filtering methods to detect multi-frequency PS in future CMB experiments. Moreover, we show that a multi-frequency approach can detect sources with higher accuracy than single-frequency approaches also based on neural networks.
Ambilateral collimation study of the twin-jets in NGC 1052
Authors: Baczko A.-K. , Ros E. , Kadler M. , Fromm C. M. , Boccardi B. , Perucho M. , Krichbaum T. P. , Burd P. R. , Zensus J. A.
Published: November 2021

Context. With the increase in the sensitivity and resolution of radio interferometry within recent years, the study of the collimation and acceleration region of extragalactic jets in active galactic nuclei (AGN) has come into focus. Whereas a large fraction of AGN jets show a change from parabolic to conical collimation profile around the Bondi radius, there is a small number of sources that display a deviation from this standard picture, including the radio galaxy NGC 1052.

Aims. We study the jet width profile, which provides valuable information about the interplay between the central engine and accretion disk system and the formation, acceleration, and collimation of the jets.

Methods. We observed the double-sided, low-radio-power active galaxy NGC 1052 at six frequencies with the VLBA in 2017 and at 22 GHz with RadioAstron in 2016. These data are combined with archival 15, 22, and 43 GHz multi-epoch VLBA observations. From ridge-line fitting we obtained width measurements along the jet and counter-jet which were fitted with single and broken power laws.

Results. We find a clear break point in the jet collimation profile at ∼104 RS (Schwarzschild radii). Downstream of the break, the collimation is conical with a power-law index of 1.0 − 1.2 (cylindrical 0; parabolic 0.5; conical 1) for both jets. On the other hand, the upstream power-law index of 0.36 for the approaching jet is neither cylindrical nor parabolic, and the value of 0.16 for the receding jet suggests this latter is close-to cylindrical. For both jets we find a large opening angle of ∼30° at a distance of ∼103 RS and well-collimated structures with an opening angle of < 10° downstream of the break.

Conclusions. There are significant differences between the upstream collimation profiles of the approaching (eastern) and receding (western) jets. Absorption or scattering in the surrounding torus as well as an accretion wind may mimic a cylindrical profile. We need to increase the observing frequencies, which do not suffer from absorption, in order to find the true jet collimation profile upstream of 104 RS.
Full waveform inversion for bore reconstruction of woodwind-like instruments
Authors: Ernoult Augustin , Chabassier Juliette , Rodriguez Samuel , Humeau Augustin
Published: November 2021

The internal geometry of a wind instrument can be estimated from acoustic measurements. For woodwind instruments, this involves characterizing the inner shape (bore) but also the side holes (dimensions and location). In this study, the geometric parameters are recovered by a gradient-based optimization process, which minimizes the deviation between simulated and measured linear acoustic responses of the resonator for several fingerings through an observable function. The acoustic fields are computed by solving a linear system resulting from the 1D spectral finite elements spatial discretization of the wave propagation equations (including thermo-viscous effects, radiation and side holes). The “full waveform inversion” (FWI) technique exploits the fact that the gradient of the cost function can be computed by solving the same linear system as that of the direct problem but with a different source term. The gradient is computed with better accuracy and less additional cost than with finite-difference. The dependence of the cost function on the choice of the observed quantity, the frequency range and the fingerings used, is first analyzed. Then, the FWI is used to reconstruct, from measured impedances, an elementary instrument with 14 design variables. The results, obtained in about 1 minute on a laptop, are in excellent agreement with the direct geometric measurements.
Necessary optimality condition for the minimal time crisis relaxing transverse condition via regularization
Authors: Bayen Térence , Boumaza Kenza , Rapaport Alain
Published: November 2021

We derive necessary optimality conditions for the time of crisis problem under a more general hypothesis than the usual one encountered in the hybrid setting, which requires that any optimal solution should cross the boundary of the constraint set transversely. Doing so, we apply the Pontryagin Maximum Principle to a sequence of regular optimal control problems whose integral cost approximates the time of crisis. Optimality conditions are derived by passing to the limit in the Hamiltonian system (without the use of the hybrid maximum principle). This convergence result essentially relies on the boundedness of the sequence of adjoint vectors in L∞. Our main contribution is to relate this property to the boundedness in L1 of a suitable sequence which allows to avoid the use of the transverse hypothesis on optimal paths. An example with non-transverse trajectories for which necessary conditions are derived highlights the use of this new condition.
Drug errors related to self-medication in Morocco
Authors: Jadda Sara , Hami Hinde , Rhalem Naima , Coulibaly Sanou Khô , Mokhtari Abdelrhani , Soulaymani-Bencheikh Rachida , Soulaymani Abdelmajid
Published: November 2021

Introduction: Self-medication refers to the act of obtaining a drug without a prescription in order to use it for treatment. The objective of this study is to describe the epidemiological characteristics of drug errors related to self-medication in Morocco. Method: This is a retrospective study of drug errors related to self-medication, reported to the Moroccan Poison Control Center between 2014 and 2018. Results: During the study period, 99 medication errors were recorded, of which 31.6% concerned children under the age of 15 years. The average age of the patients was 26.6 years. The sex ratio was balanced, with 4 breastfeeding women. Almost all of cases (94.9%) occurred at home. Drugs acting on the nervous system accounted for 39.4% of notifications. This was a medicine error in 47.5% of cases. The patient himself was responsible for the error in 57.6% of cases. Drug administration was oral in 84.5% of cases. Of all error cases, 32.7% were symptomatic. Conclusion: The dangers of self-medication are multiple. Sometimes, self-medication can lead to severe complications. It therefore strongly recommended to follow the medical prescription and the pharmacist’s instructions as well as to educate the public about the risks associated with self-medication.
Spontaneous reporting of adverse drug reactions: nurses’ perception
Authors: Erefai Ouassima , Soulaymani Abdelmajid , Coulibaly Sanou Khô , Mokhtari Abdelrhani , Hami Hinde
Published: November 2021

Introduction: Spontaneous reporting of adverse drug reactions is the basis of pharmacovigilance, the main objective of which is to ensure the safe use of drugs, particularly cytotoxics, through continuous monitoring of adverse events caused by them. The aims of this study were to investigate the perception of nurses towards pharmacovigilance, and identify reasons for under-reporting of adverse reactions to cytotoxic drugs in Morocco. Methods: Individual semi-structured interviews were conducted with 10 nurses in charge of administering cytotoxics drugs in the Pediatric Hemato-Oncology Department of the Children’s Hospital in Rabat in 2019. The interviews were recorded, then transcribed and analyzed. Results: From this study, positive attitudes towards the reporting of adverse drug reactions by nurses were shown. Nevertheless, an insufficient level of knowledge of pharmacovigilance by the participants was showed. Lack of training was the main cause of this lack of knowledge. Conclusion: This study showed a positive perception of nurses towards pharmacovigilance and ADR reporting despite insufficient knowledge. The integration of pharmacovigilance modules in the training curriculum of nurses will help to improve ADR reporting.
Assessment of nutritional status and quality of life in patients with pancreatic head cancer
Authors: Boussenna Imane , Acharki Mohamed , Hannoun Zineb , Kenfaoui Ikram , Bour Abdellatif
Published: November 2021

The aim of this study is to evaluate the nutritional status and quality of life (QOL) in patients with unresectable pancreatic head cancer. This is a retrospective assessment that included different parameters namely: current weight, weight loss, body mass index (BMI), bilirubin level (BT), serum albumin (ALB) and C-reactive protein (CRP). Protein-calorie malnutrition was defined by the nutritional risk index (NRI) and quality of life by the general quality of life in digestive disease score (GIQL). The study included 50 patients (60% men, 40% women) with a mean age of 61.8±13.5 years. 32 patients had locally advanced tumors and 16 had metastatic tumors. All patients had significant weight loss [median 24.9% (2%-37%) of stable pre-disease weight], BMI was less than 18.5 kg/m2 in 66% (18.28 ±3.6 kg/m2). Bilirubin was greater than 200mg/l in 44%, ALB less than 35 g/l in 92% and CRP greater than 6 mg/l in 84% of patients. Severe undernutrition was present in 73% of patients and moderate undernutrition in 27%. The GIQL score was satisfactory in 73% of the patients. These results show that this cancer has a serious impact on nutritional status, hence the need to manage these patients in order to mitigate nutritional exhaustion and improve their quality of life.
Risk analysis of oil transportation from the Persian Gulf to America in connection with the Suez Canal reconstruction
Authors: Pershina Larisa , Astreina Liudmila
Published: November 2021

The tonnage capacity of the Suez Canal has almost doubled since its reconstruction. The risk analysis of oil and oil products transportation is carried out in the paper, considering this factor from the Persian Gulf to America, and in order to reveal the economic efficiency of the existing recommended routes. According to the research outcomes and calculations, it is proved that the most expensive path is the route through the Suez Canal. It can be profitable on a short haul for transportation to the countries of the Mediterranean Basin and Western Europe due to the low tariff plan for small vessels of the LRl, MR, Handymax, Handysize classes and doubling the freight by reducing the transit time over short distances. An analysis of the probable routes from the Persian Gulf to North America through the Suez Canal and bypassing Africa is carried out in the paper. The economic effect calculation of oil transportation is conducted using the example of the Sea Vigor tanker of the Suezmax class through the Suez Canal and the Cape of Good Hope, considering the distance, the cost of escorting ships through the Suez Canal, the risk assessment and cost of ship security services, the calculation of wind-wave losses of routes bypassing the African continent. Besides, the conclusions and recommendations are formulated in the paper.
Methods of engineering geophysics in the control of the reclamation state of agricultural land
Authors: Kerimov Abdul-Gapur , Saltanova Anna , Mkrtchyan Levon , Zelivyanskaya Olga , Kerimova Elizaveta
Published: November 2021

The article provides information about the possibility of monitoring the reclamation situation of agricultural land by studying the soil-lithological profile by means of electrometric methods. The essence of the applied resistance method is the study of the soil layer using constant or variable electric fields. For engineering geophysical works in sand-clay sections typical of the Stavropol Territory, various variants of research technologies are presented. The conducted studies have shown the effectiveness of the electrometric method of vertical electrical sounding, which allows, based on surface observations with a minimum amount of control drilling and analytical work, to obtain operational information about changes in the area and depth of such an important parameter for assessing the reclamation state of soils as their specific electrical resistance, depending on humidity and salinity. The VEZ method, in addition to the available information about waterlogged and saline wetlands observed on the earth’s surface by traditional methods, allows us to obtain information about hidden unfavorable zones: about changes in their configuration in area and depth.
Effect of electroosmosis to reduce the adhesion of lake sapropel to the metal surfaces of the machine for lake sapropel dewatering
Authors: Utenkova Tatiana , Kremcheev Eldar , Nagornov Dmitrii , Korotkova Olga
Published: November 2021

Recently, there has been an increase in consumer demand for organic products, which implies the use of natural fertilizers in agriculture and food additives in animal husbandry. The moisture content of products obtained from sapropel for use in animal husbandry and agriculture should vary between 60 and 65%. But the reason for the low profitability of production for the extraction of sapropel is due to its high humidity, which can reach 92-96 %, and the complexity of removing moisture. Currently, a significant problem in the dewatering of sapropel is its sticking to metal surfaces of knives-inverters and plane-parallel plates-separators on machines for its dewatering. To solve this problem, it is proposed to use the effect of electroosmosis. In this paper, the rational parameters of the operation necessary to create the effect of electroosmosis in the intermediate attachment of processing of sapropel of the machine for sapropel dewatering are determined.
The history of oil transportation logistics: the experience of interaction between water and rail transport
Authors: Deruzhinskiy Grigoriy , Kurenkov Petr , Chebotareva Eugenia , Solop Irina , Gerasimova Elena
Published: November 2021

The paper reveals the historical aspects of the use of unique schemes for the delivery of oil cargo. The authors also consider the experience of modern transport and technological systems for oil transportation, developed by the expansion of logistics tools and principles of logistic. The study of schemes for the transportation of petroleum products in polymodal transport systems in a historical context gives the idea of the uniqueness of certain methods of cargo delivery. The modern development of logistics, technologies and infrastructure in the supply of oil and cargoes demonstrate a completely different level of industrial and environmental safety.
Robotic device for automation of the control of the status of cables in the mining industry
Authors: Saypulaev Gasan , Merkuryev Igor , Skulova Polina
Published: November 2021

In this work, we propose a design of a robotic device designed to automate the process of nondestructive testing of wire rope equipment. A schematic hydraulic diagram of a robotic device with a description of the logic of work of the system is given. A mathematical model of the dynamics of the system is obtained using the Lagrange formalism. An algorithm for evaluating the control moments necessary for the implementation of programmed motion has been developed. Numerical simulation of the motion corresponding to the mode of approaching the magnetic flaw detector heads to the steel rope has been carried out. The graphs of the traction-speed characteristics and load diagrams of the drives providing the programmed movement of the links of the pantograph mechanism are presented. The results presented in this paper can be used to calculate the parameters of the power section of the electro-hydraulic drives included in the robotic device.
Development of the properties of adaptability of the support sections of treatment complexes to variable mining and geological conditions
Authors: Teremetskaya Vasilisa , Gabov Viktor
Published: November 2021

In modern conditions, intensive underground coal mining is provided, as a rule by working out the dredging sections of coal seams with long cleaning faces using high-performance mechanized complexes. They consist of a dredging machine, a conveyor and a set of sections of mobile mechanized support (SMS). SMS, supporting the roof, controlling the mountain pressure (MP) and protecting the bottom-hole space, provide conditions in complex mechanized treatment faces (CMTF) for efficient and safe coal mining. However, the potential capabilities of modern complexes significantly exceed the values of efficiency indicators achieved when using them in operating conditions. One of the reasons for this situation is the insufficient adaptability of the SMS to the mining and geological conditions (MGC) changing in a wide range as the excavation sites are worked out. Therefore, at present, studies of the possibility of developing the properties of adaptivity (kinematic, power, contact, technological) of the SMS to the MGC variables are relevant. Their results will contribute to the expansion of the functional capabilities of the SMS to maintain favorable conditions in complex mechanized treatment faces for the effective operation of the mechanized treatment complex (MTC) in variable mining and geological conditions.
Issues of building an intelligent water transport management system
Authors: Butsanets Artem , Ol’Khovik Evgeniy , Karetnikov Vladimir , Senchenko Victor
Published: November 2021

The current level of technology in terms of instruments, devices and software enables the construction of local intelligent transport systems that contribute to the prevention of accidents. It has become possible to build crewless and unmanned vessels. Geographical information services such as Google Maps, Mapbox, OpenStreetMap have already shown their effectiveness. The relevance of the study stems from the possibility to partially automate ship’s route planning nowadays. As navigation monitoring is carried out by means of VHF (very high frequency) - Automatic Identification System (AIS) receivers, the authors propose to collect and analyse data. However, for the construction of the geographical information system and data processing, the authors justified the proposal to build the concept, methodological foundations, mathematical models and scenarios, which will serve as the basis for the development of software for the geographical information system. They propose data types for constructing time/speed matrices for planning optimal routes based on the current navigational situation. The data collected will provide a 12-36 hour forecast and allow for the determination of vessel speeds and times, considering vessel specifications, traffic of other vessels, queue at locks, forecast of hydro- and meteorological conditions, estimates of traffic intensity and density. The service is expected to optimise the route in terms of speed and journey time to meet the transport and logistics challenge.
Analysis of commodity traffic in the European macro-region
Authors: Danilin German , Sokolov Sergey. , Knysh Tatiana
Published: November 2021

One of the key industries of any state is the transport industry. It plays a significant role in the development of the country’s economy and ensuring its defense capability. Therefore, the development of the transport industry is always relevant for Russia with its vastness and climatic conditions. In this work, at the first stage, the country’s cargo turnover by mode of transport is considered and the current state of the transport system, in particular, water transport, is analyzed. At the second stage, the concept of multimodal transportation is considered and the possibility of using multi-agent systems for automating management processes in water transport is being studied.
Impact analysis of bucket capacity and boom length of mining excavators on hoisting mechanism life
Authors: Kuvshinkin Sergey , Ivanova Polina
Published: November 2021

The presented article considers the influence of the design parameters of the work equipment being the boom length and bucket capacity on the operating life of the hoisting mechanism of a mining excavator. The expediency of using replaceable working equipment at mining enterprises operating quarry excavators with an unchanged basic model of the machine is justified. A significant influence of the boom length, the handle length, and the bucket capacity of a quarry excavator are noted not only on the power, energy, and operational performance of the machine but also on the static and dynamic components of the load and the resource of the main drives. It has been established that an increase in the boom length does not lead to a decrease in the operating life of the hoisting mechanism. Moreover, the predominance of high-frequency components in the external load spectrum can lead to its increase. Increasing the bucket capacity at the maximum filling factor leads to the decrease in operating life.
The development of transport infrastructure development projects
Authors: Sablina Alisa , Borodulina Svetlana
Published: November 2021

In modern conditions, one of the key factors in the economic growth of any territory is an efficiently functioning infrastructure that determines the quality of life of the population and business activity in all sectors of the economy. Transport, which is the most important element of infrastructure, implies the need to constantly improve the quality of services provided to the population in order to form a single economic space on the territory of the country. The article discusses the methods of assessment and selection of transport infrastructure development projects currently used in Russia and abroad. The problems of applying the existing methods have been identified, which requires their refinement and improvement. The article proposes a method for multi-criteria assessment and selection of transport infrastructure development projects. It will contribute to the fastest and most effective achievement of the transport infrastructure development project goals in the regions and in the country as a whole. In addition, a mechanism for calculating the effects of project implementation on related industries has been determined. Methods for assessing the risk of project implementation are proposed. The scheme of the proposed method is presented, which allows monitoring the implementation of the project by checkpoints. The paper also presents an algorithm for multi-criteria assessment and selection of projects, demonstrating the possibility of practical application of the presented developments. The research on the basis of taking into account the interests of all potentially interested parties, solving systemic management problems (the absence of “manual guidance” and the introduction of a well-functioning selection mechanism), the clarity and transparency of the mechanisms developed allowed obtaining an adequate method and make the considered and selected project demanded and cost-effective on the market of transport services.
Design of computerized controlled systems for directional laying of engineering communications
Authors: Menshenin Sergey , Menshenina Elena
Published: November 2021

The subject of research and development is the technology of directional laying of engineering horizontal inclined wells intended both for exploration drilling and for laying engineering communications by the method of static puncture, as well as installations for their implementation. Laying engineering communications in urban and industrial environments is a common problem, and the existing technologies do not fully meet the increased requirements for the accuracy of working out the specified trajectories and efficiency of wells development. Laying engineering communications through water barriers is a special issue. The proposed method is based on the prompt installation of the forward end of the whipstock barrel in the required position for controlled correction of the trajectory of the well being laid. The main disadvantage of existing methods is the use of only passive trajectory control of the working body and the absence of control systems for the main processes of laying wells. The proposed system includes a guided barrel, a computerized control and management system being the basis for developing a technology for laying directional wells of small diameter and complex profile. The considered technology is the simplest and most economically profitable in comparison with drilling and punching. The possibility of using the described developments including for the purpose of directional drilling has been substantiated.
Evaluation of modern equipment for automated control and maintenance systems for mine transport
Authors: Vishniakov Georgiy , Pushkarev Evgeniy
Published: November 2021

The article presents the results of an analytical study of the equipment of production facilities for automatic control and maintenance of mining equipment. The analysis of the needs of enterprises in parameter control systems and the actual availability of these systems is carried out. Based on the list of parameters, conclusions are drawn about the development of modern automated control systems. The list of parameters was divided into groups to simplify data processing, as well as to be able to draw conclusions about each specific group. The solution of the problem is presented, which allows one to optimize the operation of the equipment and to avoid the occurrence of critical situations as much as possible.
Problems Caused by the Impact of COVID-19 on Small and Medium Enterprises Management and its Solutions
Authors: Gechbaia Badri , Tsilosani Amiran , Prokopenko Olha , Mushkudiani Zurab , Goletiani Ketevan
Published: November 2021

The present paper has been made a comparative analysis of Small and Medium-sized Enterprises to determine the impact of the COVID-19 pandemic-related restrictions and lockdown on their activity. At the same time has been analysed pre- and post-pandemic periods. Also, the paper provides opinions about the ways how to mitigate and avoid impact on small and medium enterprises (SMEs) caused by pandemics, which might reoccur in the future. The importance of SMEs in the world and Georgian economy has been estimated in terms of added value, GDP, turnover, manufacturing products, and working place formation. It has been concluded that SMEs can handle some minor and short-term issues by themselves with the elaboration of the business continuity plan and crisis management scenarios, but these still are needed the active involvement of state aid. The latter implies financial support and professional, informational, and technical support as well, such as state internet-platform available for SMEs for interactive coordination and communication between the parties and for rapid action from the state on those fields which has been damaged mostly.
Implementation of the Concept of Sustainable Development Based on Subsidiarity in Response to Current Dlobal Challenges
Authors: Korolchuk Lesya
Published: November 2021

With the current challenges of a globalized world, such as the crown virus pandemic and the growth of anti-globalization and anti-vaccination resistance movements around the world, the concept of sustainable development as a global strategy is under threat. There is a need to use such mechanisms and means of regulating global socio-economic processes that would ensure the effective implementation of sustainable development strategy while eliminating the acute perception of the planet’s population of the negative effects of globalization. The article substantiates the application of the principle of subsidiarity in the implementation of the concept of sustainable development through the prism of an inclusive approach, as well as on the basis of the theory of sustainable development and deductive method of scientific knowledge it is developed a model for implementing the global concept of sustainable development on the basis of subsidiarity, which is to delegate the tasks of implementing the global concept from the global to the local level within the economic, social and environmental components of sustainable development and to specify these tasks at the level of the average citizen and local authorities. The implementation of the proposed model provides the involvement of every inhabitant of the planet in the processes of sustainable development with the ideological and financial support of local authorities in a decentralized environment, which will achieve sustainable development goals and reduce public resistance to global challenges.
The Impact of COVID-19 on the Development of the Segment of the International Tourism Market in Ukraine Focused on Arab Tourists
Authors: Illiashenko Sergii , Illiashenko Nataliia , Shypulina Yuliia , Golysheva Ievgeniia , Tomczewska-Popowycz Natalia , Rutkowska Małgorzata , Klisinski Janusz
Published: November 2021

The article is devoted to determining the set of external and internal prerequisites for the extending influx of Arab countries’ tourists to Ukraine in 2021 under the COVID-19 pandemic restrictions introduced in most countries. Quantitative characteristics of the flow of tourists are outlined. The main characteristics and preferences of tourists from Arab countries who visited Ukraine are determined. It is established that in conditions of restrictions caused by COVID-19, they consider Ukraine as an alternative vocation location to traditional places in European countries. A generalized profile of these tourists has been compiled. It can serve as an information base for improving tourist products (services) and the system of service rendering. An assessment of prospects for developing the international tourism market segment in Ukraine focused on tourists from Arab countries has been made. The study results can be used to make effective management decisions in the field of international tourism at the state and regional levels, as well as at the level of individual tourism service providers in the context of the continuation of the COVID-19 pandemic and its completion.