bluuebunny/crossref_metadata_2025 huggingface dataset:
Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders
Authors: Patel N. D. , Nocera A. , Alvarez G. , Moreo A. , Johnston S. , Dagotto E.
Published: June 2019

Resonant Inelastic X-Ray Scattering (RIXS) experiments on the iron-based ladder BaFe2Se3 unveiled an unexpected two-peak structure associated with local orbital (dd) excitations in a block-type antiferromagnetic phase. A mixed character between correlated band-like and localized excitations was also reported. Here, we use the density matrix renormalization group method to calculate the momentum-resolved charge- and orbital-dynamical response functions of a multi-orbital Hubbard chain. Remarkably, our results qualitatively resemble the BaFe2Se3 RIXS data, while also capturing the presence of long-range magnetic order as found in neutron scattering, only when the model is in an exotic orbital-selective Mott phase (OSMP). In the calculations, the experimentally observed zero-momentum transfer RIXS peaks correspond to excitations between itinerant and Mott insulating orbitals. We provide experimentally testable predictions for the momentum-resolved charge and orbital dynamical structures, which can provide further insight into the OSMP regime of BaFe2Se3.
Operation of graphene magnetic field sensors near the charge neutrality point
Authors: Song Guibin , Ranjbar Mojtaba , Kiehl Richard A.
Published: June 2019

Graphene is a promising material for sensing magnetic fields via the Hall effect due to its atomic-scale thickness, ultra-high carrier mobilities and low cost compared to conventional semiconductor sensors. Because of its Dirac band structure, graphene sensors differ from semiconductor sensors in that both electrons and holes participate in the carrier transport. This two-channel transport complicates the sensor operation and causes performance trade-offs that demand careful examination. Here, we examine the operation of graphene sensors operated near the charge neutrality point (CNP) where two-channel transport prevails. We find that, while the largest magnetoresistance occurs exactly at the CNP, the maximum realizable Hall sensitivities occur away from the CNP and depend on linearity constraints and power limitations. In particular, a more stringent linearity constraint reduces the realizable sensitivities for mobilities above a critical value µc, which scales with magnetic field.
Highly active bidentate N-heterocyclic carbene/ruthenium complexes performing dehydrogenative coupling of alcohols and hydroxides in open air
Authors: Wang Zhi-Qin , Tang Xiao-Sheng , Yang Zhao-Qi , Yu Bao-Yi , Wang Hua-Jing , Sang Wei , Yuan Ye , Chen Cheng , Verpoort Francis
Published: June 2019

A highly active and robust bidentate NHC/Ru complex for the acceptorless dehydrogenative coupling of alcohols and hydroxides in open air.
The fates of aromatic protein and soluble microbial product-like organics, as the precursors of dichloroacetonitrile and dichloroacetamide, in drinking water advanced treatment processes
Authors: Lin Tao , Chen Han , Ding Shaoxin , Chen Wei , Xu Hang
Published: June 2019

Dichloroacetonitrile (DCAN) and dichloroacetamide (DCAcAm) are two typical nitrogenous disinfection by-products (N-DBPs) with strong cytotoxicity and genotoxicity.
Antihyperglycemic effect of a chicken feet hydrolysateviathe incretin system: DPP-IV-inhibitory activity and GLP-1 release stimulation
Authors: Casanova-Martí Àngela , Bravo Francisca Isabel , Serrano Joan , Ardévol Anna , Pinent Montserrat , Muguerza Begoña
Published: June 2019

The potential of hydrolysates of chicken feet proteins as natural DPP-IV inhibitors was investigated. After a screening, one hydrolysate was testedin vivoand showed antihyperglicemic effect. In addition, it stimulated GLP-1in vitroandex vivo.
Repositioning Salirasib as a new antimalarial agent
Authors: Porta Exequiel O. J. , Bofill Verdaguer Ignasi , Perez Consuelo , Banchio Claudia , Ferreira de Azevedo Mauro , Katzin Alejandro M. , Labadie Guillermo R.
Published: June 2019

Repurposing strategies present an enormous advantage for drug discovery, especially in malaria, where resources are scarce.
Selenopheno[2,3-f]coumarins: novel scaffolds with antimetastatic activity against melanoma and breast cancer
Authors: Arsenyan Pavel , Vasiljeva Jelena , Domracheva Ilona , Kanepe-Lapsa Iveta , Gulbe Anita
Published: June 2019

The general aim of the current research is to find novel non-toxic small molecules with antimetastatic activity.
A scalable, self-healing and hot liquid repelling superamphiphobic spray coating with remarkable mechanochemical robustness for real-life applications
Authors: Sun Yihan , Guo Zhiguang
Published: June 2019

A scalable, self-healing and hot liquid repelling superamphiphobic coating with remarkable mechanochemical robustness was proposed.
[2 + 1 + 1] Assembly of spiro β-lactams by Rh(ii)-catalyzed reaction of diazocarbonyl compounds with azirines/isoxazoles
Authors: Golubev Artem A. , Smetanin Ilia A. , Agafonova Anastasiya V. , Rostovskii Nikolai V. , Khlebnikov Alexander F. , Starova Galina L. , Novikov Mikhail S.
Published: June 2019

The Rh(ii)-catalyzed assembly of the carbon skeleton of N-vinyl-substituted spiro β-lactams from diazocarbonyl compounds is described.
Self-assembly of chemically modified graphene sheets in an external magnetic field
Authors: Tong Mingqiong , Cao Jianda , Chen Xiaoping , Zhang Huanxia , Wu Wen , Ma Hui
Published: June 2019

The rapid developments of effective self-assembly technologies indicated that ordered structures of GO could be produced using external field inducement.
Homogeneous catalytic reduction of polyoxometalate by hydrogen gas with a hydrogenase model complex
Authors: Minato Takuo , Matsumoto Takahiro , Ogo Seiji
Published: June 2019

Homogeneous catalytic reduction of polyoxometalates by hydrogen gas with a hydrogenase model complex was investigated for the first time.
Selective switching of multiple azobenzenes
Authors: Heindl Andreas H. , Becker Jonathan , Wegner Hermann A.
Published: June 2019

Multi-state photoswitchable compounds are highly attractive for application in data storage or multi-responsive materials. Herein, a trisazobenzene macrocycle is presented, which can be switched selectively into three individual states.
Collective dynamics in a monolayer of squirmers confined to a boundary by gravity
Authors: Kuhr Jan-Timm , Rühle Felix , Stark Holger
Published: June 2019

We use MPCD simulations to study the collective dynamics in a monolayer of hydrodynamically interacting squirmer microswimmers confined to a boundary by gravity. Phenomena include a hydrodynamic Wigner fluid, fluctuating pairs/chains, and swarming.
A new carbon-black/cellulose-sponge system with water supplied by injection for enhancing solar vapor generation
Authors: Liu Shang , Huang Congliang , Huang Qiangqiang , Wang Fengchao , Guo Chuwen
Published: June 2019

The emerging solar vapor generation technology is becoming one of the most promising solar photothermal conversion technologies, which could relieve fresh water shortage.
Polynuclear ruthenium organometallic compounds induce DNA damage in human cells identified by the nucleotide excision repair factor XPC
Authors: Fast Olivia G. , Gentry Brittany , Strouth Liah , Niece Madison B. , Beckford Floyd A. , Shell Steven M.
Published: June 2019

Ruthenium organometallic compounds represent an attractive avenue in developing alternatives to platinum-based chemotherapeutic agents. While evidence has been presented indicating ruthenium-based compounds interact with isolated DNA in vitro, it is unclear what effect these compounds exert in cells. Moreover, the antibiotic efficacy of polynuclear ruthenium organometallic compounds remains uncertain. In the present study, we report that exposure to polynuclear ruthenium organometallic compounds induces recruitment of damaged DNA sensing protein Xeroderma pigmentosum Group C into chromatin-immobilized foci. Additionally, we observed one of the tested polynuclear ruthenium organometallic compounds displayed increased cytotoxicity against human cells deficient in nucleotide excision repair (NER). Taken together, these results suggest that polynuclear ruthenium organometallic compounds induce DNA damage in cells, and that cellular resistance to these compounds may be influenced by the NER DNA repair phenotype of the cells.
Prognostic significance of LncRNA GHET1 expression in various cancers: a systematic review and meta-analysis
Authors: Ye Jing , Sun Haiyan , Feng Zhengquan , Zhang Qiqin , Xia Yongliang , Ji Yunxi , Zhang Qiqing
Published: June 2019

Background: Dysregulated expression of long non-coding RNA gastric carcinoma high expressed transcript 1 (lncRNA GHET1) has been observed in several cancers, however, definite conclusion on the prognostic value of lncRNA GHET1 expression in human cancers has not been determined. The aim of this meta-analysis was to evaluate the prognostic significance of lncRNA GHET1 expression in cancers. Methods: PubMed, Web of Science and Embase were comprehensively searched for relevant studies. Meta-analyses of overall survival (OS) and clinicopathological features were conducted. Results: Ten studies were finally analyzed in the present study. High lncRNA GHET1 expression was associated with shorter OS than low lncRNA GHET1 expression in cancers (hazard ratio (HR) = 2.59, 95% CI = 1.93–3.47, P<0.01). Online cross-validation using The Cancer Genome Atlas (TCGA) data observed similar results (HR = 1.10, P<0.05). When compared with low lncRNA GHET1 expression, high lncRNA GHET1 expression was related to larger tumor size (P<0.01), worse differentiation (P<0.01), earlier distant metastasis (P=0.02), earlier lymph node metastasis (P<0.01) and more advanced clinical stage (P<0.01). Conclusion: High lncRNA GHET1 expression is associated with worse cancer prognosis and can serve as a promising prognostic factor of human cancers.
Long noncoding RNA MALAT1 promotes cardiomyocyte apoptosis after myocardial infarction via targeting miR-144-3p
Authors: Gong Xiaohong , Zhu Yun , Chang Haixia , Li Yongqin , Ma Feng
Published: June 2019

Our study aims to excavate the role of metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) in myocardial infarction (MI), especially in an ischemia/reperfusion injury model and the underlying mechanism involving the MALAT1-miR144 axis. Our results demonstrated that the expression of MALAT1 has a higher level, while miR-144 expression significantly reduced in myocardial tissue after MI and also in left anterior descending (LAD)-ligation mice. This result was confirmed in vitro studies in HL-1 cardiomyocytes followed with hypoxia/reoxygenation. In addition, overexpression of MALAT1 by MALAT1-pcDNA injection into the mice with LAD increased myocardial apoptosis in vivo, while this effect was attenuated by miR-144 mimic. Bioinformatics analysis exhibits that 3′-UTR of MALAT1 is targeted to the miR-144-3p. Up-regulation miR-144 blunted the hypoxia- or MALAT1-induced cell apoptosis. In conclusion, the expression of MALAT1 was increased, whereas miR-144 expression was down-regulated in the myocardium after AMI. MALAT1 up-regulation plays a critical role in promoting cardiomyocytes apoptosis via targeting miR-144.
Antimicrobial biomaterials with non‐antibiotic strategy
Authors: Ge Xiang
Published: June 2019

Biomedical implants have revolutionised medicine, while they also increase the risk of implant‐associated infection which is one of the most frequent and severe complications accompanied by the application of biomaterials. Since the widespread usage of antibiotics drives the emergence of multidrug‐resistant strains, the orthopaedic implant infections are usually hard to treat due to the antibiotic resistance, tolerance and/or persistence of pathogens. Given the growing impact of multidrug resistance, an urgent need has been triggered to develop new types of antimicrobial strategy other than using antibiotics. In this review, the authors highlight the recent progress on antimicrobial biomaterials with non‐antibiotic strategies including chemical strategy, physical strategy, and synergetic strategy. The antimicrobial mechanisms of many kinds of non‐antibiotic antimicrobial biomaterials are still not fully understood. Researchers gradually found that welcoming microbial cellular adhesion to a lethal surface was a more effective solution than targeting microbial cellular repulsion when designing antimicrobial surfaces. Moreover, there is a popular tendency to make the antimicrobial biomaterials not only kill pathogenic microbes but also facilitate the adhesion and growth of the healthy cell, which means that the next generation biomaterials should possess dual functions of preventing microbial infection together with promoting tissue regeneration simultaneously for biomedical applications.
Microgrids interconnection to upstream AC grid using a dual‐function fault current limiter and power flow controller: principle and test results
Authors: Shafaghatian Nima , Heidary Amir , Radmanesh Hamid , Rouzbehi Kumars
Published: June 2019

This study presents a novel magnetic‐based solid‐state dual‐function fault current limiter and power flow controller (FLPFC) that offers a promising application for safe and controllable interconnection of microgrids to upstream AC grids. The proposed structure includes series reactors and power electronic switches that protects microgrid from upstream AC grid short‐circuit fault and it controls the power flow between microgrid and upstream grid. Performance of the proposed FLPFC is analysed and simulated using Matlab/Simulink and results are confirmed by experimental tests.
Analysis of the stability and dynamic responses of converter‐based generation in case of system splits
Authors: Liemann Sebastian , Hennig Tobias , Robitzky Lena , Rehtanz Christian , Finkelmann Martin
Published: June 2019

Here, a methodical research on the stability and response of a converter‐based generation model is conducted, focusing on the accompanying effects of a system split scenario in the (European) electricity transmission network. The purpose of this research is to analyse the behaviour of a generic but detailed model in case of extreme contingencies. In particular the focus is set on reduced short‐circuit power, high rates of change of frequency, and sudden voltage phase jumps at the point of common coupling (PCC). These effects are analysed by means of electromagnetic transient (EMT) simulations. In addition, the stability of the converter control is evaluated qualitatively. For the investigations carried out here, a single reduced wind turbine model with full‐size converter is used focusing on the interactions with the accompanying phenomena of a system split. The results show that reduced short‐circuit power as well as a large and sudden voltage phase jumps can be potential reasons for the converter system to disconnect from the grid.
Offline method for determination of non‐linear dependence of machine magnetising inductance utilising parallel operation of current and voltage model
Authors: Lipcak Ondrej , Bauer Jan , Kobrle Pavel
Published: June 2019

The simplest mathematical models of the induction motor (IM) use the presumption of the machine's linear magnetising characteristics. However, this may hold only in a limited operating range of the electric drive. It is well known that the magnetising inductance saturates as a function of the magnetising current due to the non‐linear properties of the magnetic circuit. However, this is not the only type of saturation. Depending on the design of the rotor, the machine's magnetising and leakage inductances may also saturate as a function of the rotor current. A new experimental method is proposed here. It identifies the dependence of the T equivalent circuit magnetising inductance on the rotor flux and torque producing current component using parallel operation of the so‐called current and voltage model of the IM.
Chemical (in)homogeneity and atomic diffusion in the open cluster M 67
Authors: Liu F. , Asplund M. , Yong D. , Feltzing S. , Dotter A. , Meléndez J. , Ramírez I.
Published: June 2019

Context. The benchmark open cluster M 67 is known to have solar metallicity and an age similar to that of the Sun. It thus provides us with a great opportunity to study the properties of solar twins, as well as the evolution of Sun-like stars.

Aims. Previous spectroscopic studies of M 67 reported possible subtle changes in stellar surface abundances throughout the stellar evolutionary phase, namely the effect of atomic diffusion. In this study we attempt to confirm and quantify more precisely the effect of atomic diffusion, and to explore the level of chemical (in)homogeneity in M 67.

Methods. We presented a strictly line-by-line differential chemical abundance analysis of two groups of stars in M 67: three turn-off stars and three subgiants. Stellar atmospheric parameters and elemental abundances were obtained with very high precision using the Keck/HIRES spectra.

Results. The subgiants in our sample show negligible abundance variations (≤0.02 dex), which implies that M 67 was born chemically homogeneous. We note that there is a significant abundance difference (~0.1–0.2 dex) between subgiants and turn-off stars, which can be interpreted as the signature of atomic diffusion. Qualitatively stellar models with diffusion agree with the observed abundance results. Some turn-off stars do not follow the general pattern, which suggests that in some cases diffusion can be inhibited, or they might have undergone some sort of mixing event related to planets.

Conclusions. Our results pose additional challenges for chemical tagging when using turn-off stars. In particular, the effects of atomic diffusion, which could be as large as 0.1–0.2 dex, must be taken into account in order for chemical tagging to be successfully applied.
Gravitoviscous protoplanetary disks with a dust component
Authors: Vorobyov Eduard I. , Skliarevskii Aleksandr M. , Elbakyan Vardan G. , Pavlyuchenkov Yaroslav , Akimkin Vitaly , Guedel Manuel
Published: June 2019

Aims. The central region of a circumstellar disk is difficult to resolve in global numerical simulations of collapsing cloud cores, but its effect on the evolution of the entire disk can be significant.

Methods. We used numerical hydrodynamics simulations to model the long-term evolution of self-gravitating and viscous circumstellar disks in the thin-disk limit. Simulations start from the gravitational collapse of pre-stellar cores of 0.5–1.0 M⊙ and both gaseous and dusty subsystems were considered, including a model for dust growth. The inner unresolved 1.0 au of the disk is replaced with a central smart cell (CSC), a simplified model that simulates physical processes that may occur in this region.

Results. We found that the mass transport rate through the CSC has an appreciable effect on the evolution of the entire disk. Models with slow mass transport form more massive and warmer disks, and are more susceptible to gravitational instability and fragmentation, including a newly identified episodic mode of disk fragmentation in the T Tauri phase of disk evolution. Models with slow mass transport through the CSC feature episodic accretion and luminosity bursts in the early evolution, while models with fast transport are characterized by a steadily declining accretion rate with low-amplitude flickering. Dust grows to a larger, decimeter size in the slow transport models and efficiently drifts in the CSC, where it accumulates and reaches the limit where a streaming instability becomes operational. We argue that gravitational instability, together with a streaming instability likely operating in the inner disk regions, constitute two concurrent planet-forming mechanisms, which may explain the observed diversity of exoplanetary orbits.

Conclusions. We conclude that sophisticated models of the inner unresolved disk regions should be used when modeling the formation and evolution of gaseous and dusty protoplanetary disks.
An extragradient-type algorithm for variational inequality on Hadamard manifolds
Authors: Batista E.E.A. , Bento G.C. , Ferreira O.P.
Published: June 2019

This paper presents an extragradient method for variational inequality associated with a point-to-set vector field in Hadamard manifolds, and a study of its convergence properties. To present our method, the concept ofϵ-enlargement of maximal monotone vector fields is used, and its lower-semicontinuity is established to obtain the method convergence in this new context.
Use of low potencial wastewater heat
Authors: Dmitrienko Vladimir , Merenkova Nataliya , Zanina Irina , Dmitrienko Nadezhda
Published: June 2019

The article points out that exhaustion of fossil stocks of fuel and negative impacts of fuel burning on environment determined a significant interest in technologies of heat utilization of low-potential sources in many developed countries of the world. Therefore the solution of the problem of using heat utilization technologies of low-potential sources will be of great importance for preserving people's habitats. In Russia, the most promising area of using unconventional energy sources is heat supply systems of houses and buildings. The conducted analysis shows that one of the effective directions of energy saving is heat pump systems of heat supply, using the most available low potential heat source of flooded massif of soil. It is noted that a huge energy potential of water pumped from closed mines is practically unused because of considerable distance of heat consumers from water purification complexes.
The effect of thermal treatment on the properties of SLM samples with a bionic design
Authors: Dub Vladimir , Medvedev Pavel , Kudrin Konstantin , Delov Aliy , Stepanov Stepan , Sviatoslavov Dmitriy , Sinelnikov Michael
Published: June 2019

This article shows the possibility of additive technology applied to medical implants. It’s shown the difference of physical properties such as elastic module of bones, implants made of traditional technology and implants made of additive technology. Porous structure has been chosen for future implants through designing its and further calculation of its mechanical properties using software such as Solid Works, Logos and Ansys. To confirm the right choice of design of structure we manufactured samples with using Rosatom 3D printer, made heat treatment and tested them.
Algorithm for received signal in multipath propagation conditions
Authors: Chernyshov Dmitry
Published: June 2019

This article discusses the received signal reception algorithm under conditions of multipath propagation of radio waves. As well as an analytical expression of the effectiveness of this algorithm is derived from the point of view of SNR.
Application of Organosilicon Compounds for Improving Moulded Peat Quality
Authors: Belyakov Vladimir , Kuporova Alexsandra
Published: June 2019

The results of experiments on drying moulded peat modified hydrophobically with water-soluble organosilicon compounds are presented. A theoretical and experimental analysis has found that a hydrophobic agent increases the efficiency of the moulding process while reducing the degree of mechanical peat mass dispersion. When the optimum concentrations of additives are maintained, a significant increase in strength is observed with the same drying intensity.
Operational Control of the Feed of the Harvester
Authors: Kubrin Sergey , Kopylov Konstantin
Published: June 2019

Comparison of normative and actual indicators on mining testifies to inefficient work of the excavating equipment. The results of the correlation analysis of the speed of movement of the harvester relative to the section of the support with the readings of methane sensors revealed a significant dependence. When conducting mining operations in complex geological conditions at great depths, a joint step-by-step carrying out of various technological processes is required to ensure the preparation, opening and excavation of reserves and the creation of safe conditions for mining coal seams. At the same time, efforts should be made to minimize time, human and energy resources. In this regard, of particular importance is the right choice of the program of operational management of technological processes of mining, monitoring the implementation of technological operations for the timely detection of deviations from the selected mode, adjustment of the established current modes of operation of technological processes and the development, if necessary, measures aimed at reducing the risks of accidents. A promising direction of solving this problem is the use of modeling methods. The developed models of technological processes of the mining enterprise will allow planning production and supporting decision-making in the implementation of operational management.
Effect of Hydro-Physical Properties of Peat on Regulation of Peatland Drainage Systems
Authors: Misnikov Oleg
Published: June 2019

The paper analyzes changes in the hydro-physical properties of peat micro- and macrosystems in the process of drainage. Maximum moisture-holding capacity of peat is used as the main characteristic. With a full drying cycle and subsequent moistening of peat, there are three stages associated with the coagulative structure formation in the system. The boundary of the transition from the state «peat in water» to the state «water in peat» is moisture content equal to one. It divides the period of structure formation into two periods, due to the predominating action of van der Waals interactions or hydrogen bonds. In the state «water in pear» the peat system loses the ability to recover its original hydro-physical properties. Scaling up the research results on peat deposits (marshes) makes it possible to classify them according to the degree of drainage of the deposit. A new approach to the use of the term «surface water body» for peat deposits is proposed.
Blasting Delay Pattern Development in the Light of Rockburst Prevention – Case Study from Polish Copper Mine
Authors: Mertuszka Piotr , Szumny Marcin , Wawryszewicz Andrzej , Fuławka Krzysztof , Saiang David
Published: June 2019

In order to reduce the risk of induced seismicity related to underground mining, a number of preventive actions are applied in the form of passive and active prevention methods. The former are mainly of an organisational nature and their effectiveness is usually considered in the long term, while the active methods are mostly based on the detonation of explosives and are aimed to release the seismic energy accumulated in the rock mass. In this paper, modifications of the firing pattern aimed to concentrate the paraseismic vibrations while maintaining the appropriate excavation of the mining face has been verified on the basis of underground tests. The evaluation was based on fragmentation analysis. The obtained results confirmed, that the blasting pattern modifications related to the reducing of the face firing time do not cause significant differences in terms of the appropriate excavation of the mining face.
Integrated Method of Reducing the Threat of Endogenous Fires in Hard Coal Mines
Authors: Szurgacz Dawid , Sobik Leszek , Brodny Jarosław
Published: June 2019

Underground exploitation of hard coal based on a longwall system is increasingly exposed to various types of threats. In particular, this applies to endogenous fire threat. It results from coal left in the goaf, which due to favourable climatic conditions may lead to self-heating and self-ignition. In practice, due to the maintenance of the roof or the passage through the fault zones, coal is often left in the caving zone, which significantly increases the possibility of endogenous fires in this zone. Therefore, it is necessary to develop an effective prevention solution. The method presented in this paper combines all previously used methods aimed at reducing fire hazard. The levels of fire hazard indicators significantly dropped in the areas where the method had been applied. This, in turn, enabled safe mining operation in the tested longwalls, their decommission and the isolation of longwall workings. The results confirm the validity of the adopted assumptions. The method is based on practical and effective use of preventative measures designed to reduce endogenous fire threat. It can be successfully applied not only in mines without extensive fire prevention system but also in mines where other prevention methods are successfully used. It may support and supplement them. The article discusses basic assumptions of the method and presents a model of application.
Innovative Method of Gas Control in Case of Accidents in Coal Mines
Authors: Tokarev Oleg , Popov Valery , Golik Anatoly , Zubareva Vera
Published: June 2019

In the article on the basis of the analysis it is proved that the currently used technical means and methods of control of the mine atmosphere in coal mines during the conduct of rescue operations it is impossible to obtain complete and timely information about the gas situation in the system of mine workings of the emergency site and adjacent potentially hazardous areas. The article describes an Autonomous small-sized multichannel gas control system of a new technical level, protected by a patent for a utility model developed by LLC “Research and production center for automation of safety” (Moscow) and a Branch of “Prokopevsky paramilitary mine rescue unit” FSUE “VGSCH” EMERCOM of Russia (Prokopyevsk) in order to eliminate the noted problem of monitoring the mine atmosphere in the liquidation of the accident.
Justification of the Calculation Method for Arch Support with Rock Grouting
Authors: Tatsienko Victor , Gogolin Vyacheslav , Ermakova Inna , Liskovets Alexander
Published: June 2019

This paper proposes a new method for calculating arch support with grouted space behind the support. The analysis of existing installations and methods for the calculation of frame supports was made. It has been established that the existing methods of frame parts calculation do not take into account the presence of grouted space behind the support. It is proposed to take into account the presence of the grouted layer in the space behind the support when it interacts with the rock mass. The formation of partially disturbed rock adjacent to the grouted layer is taken into account in the behaviour of rocks. In this method, the arch support is replaced with a ring support. The finite element method establishes the reduced dimensions of the ring support and its module of linear deformations, corresponding to these values of the arch support when its bearing capacity is lost. The scheme for calculating arch support ultimately boils down to considering the interaction of the support, the grouted layer, the zone of partially destroyed rocks and the rest of the mass of intact rocks in the hydrostatic field of rock pressure.
The Analysis of the Influence of Rock Massif Water Saturation on the Mine Workings Anchoring Design Parameters
Authors: Tsibaev Sergey , Renev Alexey , Kudrin Evgenyi , Zaiatdinov Damir
Published: June 2019

Here in the study results of the sedimentary rocks water saturation effect on the main parameters of anchoring of mine workings: resistance, density and installation step of the support. A series of tests of rock samples with different intervals of their water saturation has been produced. It has been established that water saturation leads to a significant change in the strength properties of sedimentary rocks, depending on their petrographic composition and the period of exposure to moisture. The relation between the degree of water saturation and a decrease in the uniaxial compression strength, between the strength of a dry sample and its tendency to decrease in strength properties under the influence of moisture, between the period of exposure to moisture and decrease in strength properties has been established. The results of the study will allow to more accurately classify the rocks of the roof according to the factors of collapse and stability, which has a significant impact on the calculation of the anchoring parameters of mine workings in water-saturated zones.
Detecting Coal Self-heating by Condensation Aerosol Content in the Air
Authors: Portola Vyacheslav , Bobrovnikova Alyona , Shirokolobova Anastasia
Published: June 2019

The issues under consideration are spontaneous combustion of coal and the danger of endogenous fires for mining enterprises. The ways of detecting the hotbeds of spontaneous combustion which allow to increase the safety of mining works and to reduce economic damage from endogenous fires are analyzed. The temperature control is demonstrated to be ineffective due to thermal insulation properties of coal, and the gas analysis method - insufficient for detecting the initial stages of coal self-heating. It is proposed to detect the self-heating of coal by the condensation aerosol content formed at the cooling of the air heated in the source. The calculations of the condensation aerosol content in the air depending on the temperature of the coal self-heating spot are given. Dependences determining the temperature of coal self-heating spot, depending on the condensation aerosol content in the air passing through the coal have been obtained. Various sorbents for measuring condensation aerosol content in the air have been studied. The most effective sorbent of water vapor and condensation aerosol is macro-porous silica gel. A device detecting coal self-heating in mines, mine dumps, and coal storages has been developed. Tests in mine conditions proved the effectiveness of the method for detecting coal self-heating.
Traumatism Risk Reduction by Means of Technologies of Continuous Development of Workers’ Competency in Occupational Safety
Authors: Ivanov Yuri , Fomin Anatoly , Voroshilov Aleksey , Sedelnikov Gennady
Published: June 2019

The article is dedicated to the video informational technologies of continuous development and control of workers’ competency in occupational safety, providing significant reduction of occupational traumatism in coal mining industry. Most modern approaches to develop workers’ competency are based on the technologies, providing maximal memorization of study materials and efficient forming of initial working skills and safe work experience. Some examples of use of the technology, as well as practical results for 2014-2017 in JSC “SUEK-Kuzbass”. Key words: coal mining industry, traumatism, occupational safety, occupational safety training, competency, occupational risks.
Geomechanical Assessment of the Effect of Inhomogeneities on the Propagation of Hydrofractures in Coal Seams
Authors: Baev Mikhail , Khyamyalyaynen Veniamin , Shevtsov Aleksandr
Published: June 2019

The article gives a theoretical propagation of the development of hydrofractures in coal seams from the position of geomechanics, including the possibilities and conditions for the fracture to intersect a natural crack. A technique is proposed for carrying out experimental studies of the effect of inhomogeneities on the extension of hydraulic fractures by physical modeling on samples of equivalent materials and the facility for their conduct. The results of experiments based on the proposed technique on samples made on the basis of cement, sand, fly ash, and water are presented, with modeling of inhomogeneities of various types. The results made it possible to conclude that when the closed cavities intersect in the form of gaping cracks of limited prevalence, their rupture fluid envelops with the preservation of the rupture plane. It is noted that when crossing unbounded gaping cracks, the established enveloping phenomenon will obviously occur along the “bridge” at the points of contacts of the opposite banks of cracks that take place in a real massif, and the very intersection of the fracture of the natural crack, mainly, depends on its deformation properties, the magnitude of the angle between the planes of the fracture and the crack, and also the fluid pressure.
Analysis of Longwall Salvage Operations in JSC SUEK-Kuzbass Underground Mines
Authors: Yermakova Inna , Fedusov Vyacheslav
Published: June 2019

The longwall coal mining method is the most productive mining method. However, the salvage operations which include the formation of the salvage chamber and the salvage of longwall face equipment require improvement. In 2011-2017, the time spent for salvage operations in SUEK-Kuzbass mines exceeded the standard time by more than 900 days. It has been established that the longwall face width from 230 to 300 m has no effect on the duration of salvage operations.
The Direction of Drilling Wells as a Factor of Improving the Crushing of Sedimentary
Authors: Katanov Igor , Sysoev Andrey , Panachev Ivan
Published: June 2019

The task of the work is to improve the quality of preparation of the rock mass for excavation. Explosive destruction of the rock is based on several theories developed by well-known scientists. The improvement of quality of preparation of rock mass to excavation without an increase in the value of specific consumption of explosives is important in the present time. The analysis of scientific works and industrial results of explosive preparation of the overburden removal is made. It is established that depending on the angle of the explosive charges meeting with the rock layers, the quality of its crushing changes. Modern drilling machines can drill at any angle. It is proposed to drill wells perpendicular to the rock layers. The proposal differs in originality from the previously known principles of charge placement of explosives in wells. This method of charge placement has a positive effect in sedimentary rocks in coal mines. The results of industrial explosions in coal mines have confirmed the theoretical reasoning.
The Technology for Manufacturing HighStrength Pipe-Concrete Bearing Elements to Increase the Stability of Underground Structures
Authors: Uglianitsa Andrey , Pokatilov Youry
Published: June 2019

It is proposed to use high bearing small-size pipe-concrete units in the construction of underground geotechnical structures instead of large-sized reinforced concrete units (support blocks, pylons, columns, etc.). The analysis of the methods of manufacturing pipe-concrete units, their advantages and disadvantages is conducted. The process flowchart for manufacturing pipe-concrete units with barothermal pre-stressing of a concrete mixture in a steel pipe was developed to ensure the collaboration of a steel pipe and a concrete core and increase its strength. Experimental research in barothermal treatment of a concrete mixture in a steel pipe was performed using the laboratory model of a pipe-concrete unit, which showed the efficiency of the proposed technological scheme for the production of pipe-concrete units. The lines for further research in the development of a method for determining the optimal parameters of the technological scheme for manufacturing pipe-concrete units with barothermal pre-stressing of a concrete mix are planned.
Quality Numerical Indicators of Raw Materials of Sanguisorba Officinalis L. Growing on Overburden Dumps of Kuzbass Coal Surface Mines
Authors: Egorova Natalya , Egorova Irina , Maltseva Elena , Sukhikh Andrey
Published: June 2019

Medicinal plant materials quality assessment of the Sanguisorba officinalis L. growing on the Kedrovsky coal mine dumps in Kemerovo region is given. The analysis of obtained burnet raw material quality indicators (moisture, total ash, insoluble in hydrochloric acid, quantitative content of tannins, heavy metals, radionuclides) showed that this vegetable raw material match with the requirements of PhI.2.5.0078.18 “Sanguisorba officinalis L. rhizome and roots”. Tannins average content in the burnet rhizomes and roots was 15.708 ± 0.307%, which is within the normal range (up to 14%). It was found that the heavy metals (Pb, Cd, Hg) content does not exceed the MPC adopted for medicinal plant raw materials (G.Ph.A.5.5.000.0009.15). The obtained indicators for the artificial radionuclides (Cs-137, Sr-90) content showed that their quantity in the raw material is also within the normal range and their actual content is several times less than the normalized one. From the point of radiological safety view the studied raw materials are not dangerous since they accumulate 0.36% Sr-90 and 0.42% Cs-137 from the levels established by regulatory documentation. Therefore, the burnet medicinal plant raw material harvested at the Kedrovsky open-pit coal mine on the territory of waste dump does not represent a danger to human health.
Zero Waste Technologies and Solution of Economic and Environmental Problems of Sustainable Development
Authors: Dotsenko Elena , Ezdina Natalia , Mudrova Svetlana
Published: June 2019

Economic and environmental problems are closely related, and solving some of them, the others cannot be solved. The state of the environment directly forms the potential of the economic sphere. For example, resources for industrial enterprises are formed in the natural environment, and the capacity of plants and factories depends on resources’ quantity. The amount of money to be spent on the purchase and installation of treatment plants, on the measures to eliminate water, air and soil pollution, depends upon the profit. Each country has its own list of environmental problems related to the economy. They are engaged in their elimination at the state level, but first of all the responsibility for the consequences is the burden of companies’ management. The active development of the economy should not adversely affect the state of the environment. Both individual enterprises and whole states should control the economic and environmental situation in order to achieve a balance and solve global problems. The most important form of interaction between the state and business in solving economic-and-environmental problems is the introduction of zero waste technologies in all their diversity and achieving their multiplicative effect. The paper shows the relationship between environmentally-oriented innovative development of the economy and the introduction of zero waste technologies.
Determination of the Artificial Filtering Massif Location for Purification Quarry Wastewaters of Kamyshansky Open Pit Mine
Authors: Tyulenev Maxim , Markov Sergey , Makridin Eugene , Lesin Yury , Gogolin Vyacheslav
Published: June 2019

The most common purification methods in the coal industry are settling ponds and filtering treatment constructions. But in some cases, the use of traditional methods and schemes of water purification is complicated by the conditions of water discharge or does not provide the required water quality. For example, sharp seasonal fluctuations in the level of discharge and water pollution, a large number of spillways distant from each other and a change in their location during the development and moving of mining operations often make it difficult to use expensive and difficult to operate industrial wastewater treatment plants. Often, mining enterprises have a shortage of land areas to place such plants. In this regard, studies have been conducted aimed at identifying the possibility of water purification from suspended solids by filtering in arrays of coarse rock and semi-rock. Such arrays included, first of all, overburden dumps, various technological dams and embankments, as well as specially constructed filter arrays from mining waste. This article presents the results of studies to determine the location of the filter massif in the open pit “Kamyshansky”.
Digitalization and Innovative Development of Mining Processes
Authors: Stenin Dmitriy , Stenina Natalya , Akanov Arman , Sagindikov Kakim
Published: June 2019

This article discusses the issues of digitalization and using of information technologies, and in particular databases at all stages of the technological process of mining. In addition, the paper proposes options for protection against some of the possible attacks and information protection using countermeasures and control methods that exist at the present time. Database security is an important approach for planning and decision-making clear the security requirements of the database. Database security, especially for an industry such as mining, is a very important issue for companies. With increasing complexity of the databases, we may encounter with more complex problems related to information security.
Influence of Efficiency Factors of Gearing and Rope Drive in the Hoist Behaviour
Authors: Stefan Vöth , Korotkov Alexander
Published: June 2019

The braking effect of hoists is influenced by the efficiencies of the installed components. It is foreseeable that the occurring losses lead to greater decelerations than lossless consideration. This article considers the efficiency and its description. He goes from an easily comprehensible description for a simple mechanical system for the description of a hoist with its temporally and locally variable energy inputs and energy outputs. The article presents a general equation for the system acceleration of hoists. This general equation potentially takes into account three brakes: motor brake, service brake and safety brake and two efficiencies: Gearing efficiency and rope drive efficiency. Finally, the braking distances and the required braking torques for braking with the safety brake of the reference hoist are shown. The contents are inspired by the VDI Technical Committee 304 Cranes.
Actual Technical Condition Assessment of A Motor-Wheel Gear of A Dump Truck Belaz Based on the Operating Oil Parameters
Authors: Kudrevatykh Andrei , Ashcheulov Andrei , Ashcheulova Alena , Karnadud Olesia , Rattmann Ludger
Published: June 2019

One of the most important indicators of mining complexes are reliability and durability of their components. Studies have shown that the largest amount of mine dump truck down time occurs due to unforeseen failures of a motor-wheel gear. The introduction of additional technological processes to diagnose the actual technical condition of a gear in the maintenance procedure will make it possible to maintain directly the state of its component parts with in-place manner. The method of diagnosing the condition of a motor-wheel gear is based on physical and chemical analysis of oil, as well as its temperature control. During open pit machinery exploitation, various mechanical impurities of wear products of rubbing surfaces accumulate in the operating oil, so it is possible to predict the degree of wear of gear units and mechanisms based on these mechanical impurities. The introduction of this method in production will significantly reduce the down time of dump trucks, thereby increase the productivity of the enterprise and reduce repair costs.
Formation of the Institution of Environmental Responsibility of Coal Industry Enterprises
Authors: Bondarev Nikolay , Bondareva Galina , Ravochkin Nikita , Windemut Valentina
Published: June 2019

In this article the authors analyze the formation of an institution of environmental responsibility developing a modern view on the practice of corporate social responsibility, taking into account the specifics of Russian enterprises in the coal industry. The study emphasizes the importance of considering the ecological aspect and environmental protection, which is becoming relevant in the context of the implementation of anthropogenic and man-made impacts on the nature caused by industry. A comparison is made in terms of time awareness by foreign and domestic enterprises of the coal industry of a responsible attitude to the biosphere and ecosystems. The environmental aspect is marked as integral to the coal industry. It is substantiated that the formation of the institution of environmental responsibility of coal industry enterprises reflects the impossibility of taking into account all the needs of target audiences with corporate social responsibility events. It is clarified that the need for the formation of this institution is given by megatrends of civilizational development. In conclusion, the study provides the starting points for the implementation of the processes of the formation of the institution of environmental responsibility.