bluuebunny/crossref_metadata_2025 huggingface dataset:
Y-shaped Ventriculo-peritoneal Shunt for Adult Complicated Hydrocephalus: Report of 28 Illustrative Cases
Authors: Ren Xiaohui , Yang Chuanwei , Li Xiangrong , Wang Yonggang , Lin Song
Published: October 2020

ObjectiveTo investigate the effectiveness of Y-shaped ventriculo-peritoneal shunt (VPS) (one abdominal tip connected with double or triple ventricular tips by one or two Y-shaped connectors) in the treatment of adult complicated hydrocephalus, we analyzed the long-term outcome and reported some illustrative cases.MethodsAmong 1,100 VPS surgeries between 2012 and 2017 in neurosurgery of Beijing Tiantan Hospital, twenty-eight (2.5%) adult patients with multiloculated hydrocephalus treated with Y-shaped shunt were analyzed.ResultsNineteen patients underwent Y-shaped VPS (bilateral frontal horn shunt) before or without tumor resection/stereotactic biopsy, 7 patients underwent Y-shaped VPS after tumor resection (5 bilateral and 2 triple shunts), and the other 2 patients underwent sequential bilateral VPS (unilateral VPS with additional contralateral ventricular tip by Y-shaped connector 6 months later). The one-year and two-year hydrocephalus-free survival rate for was both 88.7%. The one-year and two-year overall survival rate was both 66.7%. Cox regression confirmed that the OS is correlated with tumor grades. ConclusionsY-shaped VPS strategy is an easy and reliable option for multiloculated hydrocephalus, which can be used as the first choice for some indications.
Development of an Intervention to Support Reproductive Health of Garment Factory Workers in Cambodia
Authors: Smith Chris , Sokhey Ly , Tijamo Camille , McLaren Megan , Free Caroline , Watkins Justin , Amra Ou , Masuda Chisato , Williamson Amy , Oreglia Elisa
Published: October 2020

Background: Garment factory workers in Cambodia are potentially a vulnerable population in terms of support for reproductive health issues and access to services, as the majority are young women aged under 30 years who have migrated from rural areas away from their family and community support. The aim of this paper was to describe the development of an intervention to support the reproductive health of garment factory workers in Cambodia.Methods: The research was conducted by a multidisciplinary team with backgrounds in public health, linguistics, digital cultures and service delivery in a suburb of Phnom Penh where many garment factories cluster. Informed by intervention mapping approaches, we conducted a needs assessment with general and participant observation and semi-structured interviews, followed by intervention development activities including specifying possible behaviour change, designing the intervention and producing and refining intervention content.Results: Our research identified some challenges that Cambodian garment factory workers experience regarding contraception and abortion. Concerns or experience of side-effects were identified as an important determinant leading to non-use of effective contraception and subsequent unintended pregnancy. Financial constraints or a desire to space pregnancies were the main reported reasons to seek an abortion. Information about medical abortion given to women by private providers was often verbal, with packaging and the drug information leaflet withheld. Given the observed widespread use of social media among factory workers, we developed three short ‘edutainment’ videos about contraception which were evaluated after one month. In addition we adapted three informative videos made by Marie Stopes International (MSI) from English to the Khmer language, and also adapted the MSI medical abortion ‘Mariprist’ instruction leaflet to a simple video format.Conclusions: We describe the development of an intervention to support reproductive health among garment factory workers in Cambodia. These videos could be further improved and additional videos could be developed. More work is required to develop appropriate and effective interventions to support reproductive health of garment factory workers in Cambodia.
Composition of phenolic compounds in gasification wastewater
Authors: yuan zhao
Published: October 2020

The crude phenol was used as raw material, which was extracted by organic solvent from wastewater of typical fixed bed gasification process. The distillation range of raw materials was analyzed. According to the results of distillation range analysis, the wide and narrow fractions of raw materials were cut by using real boiling point distillation device. The method of derivatization pretreatment combined with gas chromatography external standard was used for qualitative and quantitative analysis of phenolic compounds in different fractions. The results showed that the yield of the fraction below 290 ℃ was 68.50% (mass fraction), in which 33 kinds of effective phenolic compounds could be identified, and the total amount of identified phenols was nearly 80%. The content of eight phenolic compounds was relatively high, among which the content of phenol was the highest (26.34%) , followed by catechol 13.44%. Among these phenolic compounds, the content of the remaining six phenols ranged from 4 to 8%, the total content of m-cresol and p-cresol was more than 12%, and the content of 5-indenol was nearly 8%. The yield of the fraction rich in low-grade phenol below 230 ℃ was 35.40%, in which the content of phenol was more than 40%, the total content of cresol was more than 23%, and the total content of m-cresol and p-cresol was nearly 20%. At room temperature, the fractions of 235 ~ 245 ℃ and 245 ~ 260 ℃ were white crystals, in which catechol content was about 50%, and 5-indenol content was more than 10%. The content of these two phenolic compounds with high added value was low in typical coal tar, so it was difficult to extract them. However, they could be enriched in gasification wastewater by water selection due to their strong polarity and good water solubility, which made it possible for them to be further extracted.
A Triple-Correlation Framework for Demonstrating an Innovative Gas Warning System: A Case Study in China
Authors: wu robert , Fan Jianfeng , Yan Wanjun , Shen Bo , Soar Jeffrey , Gou Jinwen , Liu Bao , Zhang Zhongwu , Gide Ergun , Huo Wenying , Wang Peilin , Peng Zhanfei , Wang Ya
Published: October 2020

This research aims to develop an innovative gas warning system for improving production safety in the underground coal mining industry. Coal mining is an important sector for China’s economic development; gas monitoring systems are widely adopted as almost 60% of coal mining accidents are caused by gas. Existing gas monitoring systems mainly focus on simply detecting real-time data obtained from gas sensors. The literature review did not find gas monitoring systems that provide alarms or warnings from the correlation of gas with data from other sensors. This research aims to fill this gap to uncover hidden patterns and correlations between gas and temperature, wind, and dust, and incorporate data analytics into developing an innovative, integrated gas warning system. Correlational research was adopted using 328,320 data outputs obtained from ZhongXing Co. Ltd in Dec 2019. The study found strong relations between gas and temperature, wind, and dust. A Triple-Correlation Theoretical Framework and a Unified Modeling Language (UML) model were developed for an innovative gas warning system. As a result of this research, the ZhongXing Innovative Gas Warning System was developed and deployed for user acceptance testing on 28 Aug 2020.
P-V-Tmeasurements of Fe3C to 117 GPa and 2100 K: Implications for stability of Fe3C phase at core conditions
Authors: McGuire Chris , Komabayashi Tetsuya , Thompson Samuel , Bromiley Geoffrey , Ishii Takayuki , Greenberg Eran , Prakapenka Vitali B.
Published: October 2020

We report the thermal Equation of State (EoS) of the non-magnetic Fe3C phase based on in situ X-ray diffraction (XRD) experiments to 117 GPa and 2100 K. High-pressure and temperature unit-cell volume measurements of Fe3C were conducted in a laser-heated diamond-anvil cell. Our pressure-volume-temperature (P-V-T) data together with existing data were fit to the Vinet equation of state with the Mie-Grüneisen-Debye thermal pressure model, yielding V0 = 151.6(12) Å3, K0 = 232(24) GPa, K0′= 5.09(46), γ0 = 2.3(3), and q = 3.4 (9) with θ0 = 407 K (fixed). The high-T data were also fit to the thermal pressure model with a constant αKT term, PTh = αKT(ΔT), and there is no observable pressure or temperature dependence, which implies minor contributions from the anharmonic and electronic terms. Using the established EoS for Fe3C, we made thermodynamic calculations on the P-T locations of the breakdown reaction of Fe3C into Fe7C3 and Fe. The reaction is located at 87 GPa and 300 K and 251 GPa and 3000 K. An invariant point occurs where Fe, Fe3C, Fe7C3, and liquid are stable, which places constraints on the liquidus temperature of the outer core, namely inner core crystallization temperature, as the inner core would be comprised by the liquidus phase. Two possible P-T locations for the invariant point were predicted from existing experimental data and the reaction calculated in this study. The two models result in different liquidus “phases” at the outer core-inner core boundary pressure: Fe3C at 5300 K and Fe7C3 at 3700 K. The Fe7C3 inner core can account for the density, as observed by seismology, while the Fe3C inner core cannot. The relevance of the system Fe-C to Earth’s core can be resolved by constructing a thermodynamic model for melting relations under core conditions as the two models predict very different liquidus temperatures.
Heat capacity and thermodynamic functions of partially dehydrated sodium and zinc zeolite A (LTA)
Authors: Dickson Matthew S. , Rosen Peter F. , Neilsen Grace , Calvin Jason J. , Navrotsky Alexandra , Woodfield Brian F.
Published: October 2020

Zeolite A (LTA) is an industrially important zeolite that exhibits sorption-induced framework flexibility, the thermodynamics of which are poorly understood. In this work, we report heat capacity measurements on zinc and sodium zeolite A from 1.8 to 300 K and compare the heat capacity of water in sodium zeolite A with that of water in other zeolites. The heat capacity of zeolitic water varies significantly depending on the hydration level and identity of the host zeolite, and more tightly bound water exhibits strong inflections in its heat capacity curve. This suggests a combination of effects, including differences in water-framework binding strength and hydration-dependent flexibility transitions. We also report fits of the heat capacity data using theoretical functions, and we report values for CP,m∘,Δ0TSm∘,Δ0THm∘, and Φm∘ from 0 to 300 K. These results contribute to a systematic thermodynamic understanding of the effects of cation exchange, guest molecule confinement, and sorbate-dependent flexibility transitions in zeolites.
Analysis of crude mineral sample preparation schemes
Authors:   Ural State Mining University, Kozin Vladimir Z.
Published: October 2020

Introduction. Sample preparation schemes are multi-stage. Sample reduction in the process of preparation introduces extra inaccuracy in the result of sampling, consequently, sample preparation schemes inaccuracy should be calculated with further selection of its rational parameters. Research methodology is based on calculation by the formula of sample reduction random inaccuracy. Inaccuracy calculation of a sample preparation scheme. Calculation has been carries out of the scheme recommended by GOST 14180-80. Paradoxical growth of inaccuracy of sample preparation has been shown with ore homogeneity growth. Determination of sample mass by the stages of preparation. Standards and techniques of ore and nonferrous metals concentrates sampling for the creation of sample preparation schemes recommend finding the coefficient in minimum mass formula depending on the mass fraction variation coefficient in the sampled product. Sample preparation is carried out in laboratory conditions, and sample mass cannot depend on this coefficient of variation. Sample inhomogeneity in the laboratory depends only on the inhomogeneity of separate lumps of a sample. Sample inhomogeneity in the preparation laboratory is defined by lump dispersion, and the coefficient is the function of this dispersion, admissible inaccuracy of sample reduction and the dimensions of grain impregnations of the mineral which contains the analyte. 78 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2020 ISSN 0536-1028 For each factory, individual coefficient can be found, and sample masses can be calculated by the stages of preparation. Analysis of sample preparation schemes. Sample preparation scheme inaccuracy formula is given. Calculation and analysis of the model scheme of sample preparation according to GOST 14180-80 have shown that at the third crushing stage the sample is advisable to be crushed not up to 3, but up to 2 mm, and the recommended sample size at the final stage 8.08 hardly improves the result of preparation, that is why the previous recommendation of 0.1 mm can be used.
Features of engineering and environmental research for disturbed lands restoration in mining regions
Authors:   Ural State Mining University, Guman Olga , Makarov Anatolii ,   Ural State Mining University, Grevtsev Nikolai ,   Ural State Mining University, Vegner-Kozlova Ekaterina ,   Ural Federal University; Institute of Economics UB RAS
Published: October 2020

Introduction. Sufficiently widespread expansion of disturbed lands in mining regions, particularly within the borders of residential areas, necessitates restoration measures, the direction and the content of which is determined first of all by the results of engineering and geological investigations. Research aim is to reveal the features of engineering and environmental studies for disturbed lands restoration based on the previous work performed at the territories of mining entities and residential areas including open pits and industrial waste sites. The research also aims to show the features of selecting grounds for these purposes and using secondary resources. Methodology. In order to study and generalize the results of the disturbed areas engineering and environmental research, apart from on-site and analytical research, the authors applied theoretical research methods including the analysis and synthesis both own materials and various information sources. Results. The article considered differences and common features of disturbed lands engineering and environmental research within the borders of the residential areas by the example of Ekaterinburg city and mining territories of Asbest industrial hub. It has been determined that the effect on the ecological state of disturbed territories is of a cyclic character. The features of using secondary resources for disturbed land restoration within the limits of “circular economy” is a strategy of sustainable development. The use of the man-made mineral formation is recommended, which can promote to further improvement of ecological situation of mining regions.
Variability of rock pressure along the length of the working face
Authors:   Institute of Coal, Federal Research Centre of Coal and Chemistry SB RAS, Shinkevich Maksim
Published: October 2020

Introduction. Common deepening of mining causes problems with maintaining the achieved production capacity. The ability of the mechanized supports to withstand rock pressure in such conditions is questioned. Modern supports equipped with pressure sensors will make it possible to control and prevent the negative impact of the increased rock pressure and visualize the results. Research aim is to determine the rock pressure variation rate along the length of the longwall in order to avoid its negative impact and to plan the capacity of the cutter-loader and load upon the working face in various mining and geological conditions in a more substantiated way. Methodology. The use of the Surfer software to visualize the processes of displacement and construct the geomechanical structure diagram of the coal-bearing disintegrated rock mass in the form of geomechanical layers hierarchy makes it possible to forecast the sites with the increased rock pressure upon the coal bed and the longwall support. Results. Timely and well-grounded determination of the sites with the increased rock pressure upon the coal bed and the powered support at the longwall face advance is the technical results of the research. Analysis and discussion. The geomechanical structure diagram shows the sequence of disintegrated rock displacement arches development. Overburden and bearing pressure acts upon the coal bed between the displacement arches and depends on the depth of coal bed occurrence, working face advance speed and the strength of the roof rock. It is the sum of the overburden and bearing pressure that is reflected on the state of the coal bed ahead of the face of the longwall; their impact is wave-like. Summary. The diagram will make it possible to forecast the sites subject to the negative impact of rock pressure along to length of the longwall and improve the effectiveness of coal bed mining by means of more accurate calculation of load upon the working face and the capacity of the cutter-loader, specify the force of cutting machine working elements during coal bed breaking, choose the support of the longwall according to the load-carrying capability, plan some measures to eliminate the negative impact of rock pressure at particular sites, and strengthen the marginal part of the bed in order to reduce visible coal sloughing.
http://www.mining-science.ru/download/2020/3/04.pdf
Authors:   Federal Research Center of Coal and Coal Chemistry of SB RAS, Cherdantsev Nikolai
Published: October 2020

Introduction. Reliable forecasts of pillars geomechanical state are required to ensure rhythmic and safe work when mining a coal bed. Research aim is to construct a state model of the coal pillar located between the headways, based on the fundamental methods of elasticity theory and mechanics of a granular media, carry out a computational experiment within the model, and analyse the results. Methodology. The stress field in the coal pillar has been constructed in the course of solving the elastoplastic problem. By replacing the ultimately stressed marginal zone of the bed with the stresses which act within the zone, the problem has been reduced to the second exterior boundary value problem of elasticity theory and has been solved by the boundary element method. Ordinary and special Coulomb–Mohr criteria simultaneously fulfilled for the coal bed and rock mass contact are the criterion of the limit state onset. Actual pillar load is determined by integrating the vertical stress curve along the bed roof, which has been obtained from elastoplastic problem solution, while the ultimate load is determined from the condition that the whole pillar is in ultimately stressed state. Results. The dependence between the safety factor of the pillar between two identical headways, determined by V. D. Shevyakov method, and the growth of its width represents a graph in the form of a monotonically increasing curve. The curve flattens as soon as the depth increases. Summary. The results from the developed model of coal rock mass geomechanical state can be successfully used as coal pillar strength forecasts.
Justifying the parameters of dredging in various types of stopes and massive productive strata
Authors:   Irkutsk National Research Technical University, Dudinskii Fedor , Talgamer Boris ,   Irkutsk National Research Technical University, Murzin Nikolai ,   Irkutsk National Research Technical University
Published: October 2020

Introduction. Due to a wide variety of placer dredging conditions, traditional methods of dredging parameters calculation do not always take into account all aspects of productive strata mining. It is first of all true for deep placers operation and mining with side cuts. Research aim is to improve the methods of calculating dredging parameters and the capacity of pilesupported bucket chain dredgers. Methodology. Existing methods of calculating dredging parameters and dredgers capacity do not take into account the applied mining method, stope type, and upper stope cave-in conditions. The indicated factors greatly influence the parameters of productive strata excavation and washery refuse disposal. Taking these ISSN 0536-1028 «Известия вузов. Горный журнал», № 3, 2020 13 factors into account makes it possible to forecast the indicators of the pile-support dredgers more accurately. Results. Investigation of some aspects of dredging trenches and side cuts has made it possible to establish the dependence of dredger maneuvering angle in pit face and capacity on cutting depth when mining massive productive strata; spoil dumps parameters dependence on the type of stoping; the interrelation between the daily capacity and the width of the front bank under various vertical distribution of rock. The indicated dependences allow to determine dredging parameters and indicators for particular conditions. Summary. The proposed approach, which calculates dredging parameters when using side cuts and when mining deep placers with non-uniform thickness of sands, makes it possible to calculate the chips size, buckets filling ratio and sand fragmentation ratio in a more substantiated way; it makes it possible to more effectively manage the process of sand mining, thus increasing the capacity of dredges.
The effect of blasting on a high-pressure gas pipeline located within the borders of a mine take
Authors:   Institute of Mining UB RAS, Kutuev Viacheslav , Zharikov Sergei ,   Institute of Mining UB RAS
Published: October 2020

Introduction. This article shows the results of investigating the allowable dynamic load on the II category high-pressure gas pipeline installation site located within the borders of a mine take, which is connected with blasting at SLK Cement open pit. Research aim. The research is aimed at increasing the level of secure operation of a gas pipeline and establishing restrictions in the seismic impact of mining (blasting) towards the gas pipeline installation site. Methodology. The methods of IM UB RAS has been applied concerning the determination of allowable distances from a blast in the open pit to the secure facility (gas pipeline) depending on the mass of the explosive at the timing stage, soil condition coefficient, and the allowable speed of seismic vibrations. Results. It has been determined that taking into account the depth of blast in the open pit and corresponding geological conditions, by means of changing mass at the timing stage, it is possible to totally eliminate the negative impact of a blast on a gas pipeline installation site. A design scheme has been proposed to determine secure distances to the high-pressure gas pipeline depending on the angle of open pit slope and the depth of blasting in the open pit. Summary. A dynamic design analysis has been carried out of blasting force action on soil and highpressure gas pipeline. It has been recommended to establish some restrictions in explosive mass at the level of minimum hazardous values. And for the future blasts it is also recommended to design a charge initiation scheme with explosive mass of less than one ton at the timing stage.
Step-by-step investigation of engineering and geological conditions of mineral deposits for safe mining
Authors:   Ural State Mining University, Zvonarev Evgenii
Published: October 2020

Introduction. Engineering and geological processes as a result of process operation at deposits often develop at an exponential rate. This problem is specific due to complex and multifactorial nature of the processes which arise when rock mass interacts with mine workings. For this reason engineering and geological information should be obtained step by step beginning with the stage of prospecting and evaluation and proceeding at the stages of construction and operation of mine workings. Research aim is to consider methodological basis to form the databases of geological engineering information about mining facilities at various stages of their life cycle. Research methodology. The types of operations have been described on acquisition and interpretation of engineering-geological information required to detail models of the engineering-geological conditions at every stage. An important factor in creating a reliable and functioning geomechanical model of mineral deposits is survey operations follow-up and gradual transition from regional and provincial engineeringgeological conditions and tectonic structure to engineering-geological conditions of a specific deposits or occurrence. Research results. By the example of chrome field located in the Polar Urals within the Rai-Iz massif, all detail stages of mineral deposits engineering-geological conditions model have been established taking into account the conditioning selected components and factors; possible problems have been described and the results of step-by-step predictive estimates of mine workings stability have been presented. Summary. The research present an example of engineering-geological data detailing by the results of the gamma ray log and caliper logging at the stages of pit slope stability forecast model construction. Obtained in the course of long-term data collecting and processing, the model of Tsentralnoe field has proved its efficiency in the course of mining.
Studying the possibilities of improving centrifugal separation efficiency
Authors:   Ural State Mining University, Morozov Iurii , Penkov Pavel ,   Ural State Mining University
Published: October 2020

Object and aim of research. One direction in improving valuable components extraction in centrifugal separation is to apply it in the scheme of circular concentration. By means of multiple passing of a pulp flow through the centrifugal separator, higher indicators of valuable component extraction in heavy residue are ensured. The aim of this research is to study the possibility of improving the efficiency of centrifugal separation based on float circulation. Methodology. Laboratory testing has been carried out to cope with the given task. Centrifugal separation has been fulfilled in a laboratory fortex formation centrifugal separator K-200VL under the cone rotation 86 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 3. 2020 ISSN 0536-1028 frequency of 1000 r/min. Hydrocycloning has been carried out in cyclone separator GTs-75 with the apex diameter of 1.7 cm. The obtained concentrate and tailings were subject to gold assay test. According to the results of the assay test, the calculation of gold extraction in heavy residue and float has been fulfilled. Summary. The obtained result testifies to high efficiency of the proposed technical solution. The proposed technical solution ensures improved efficiency of the process by means of increasing the extraction of particles of increased density in the concentrate when increasing its quality and reducing specific water consumption for the process
Investigating the method of improving technological parameters of centrifugal separation with pneumatic turbulization
Authors:   Ural State Mining University, Iurii Morozov , Pavel Penkov ,   Ural State Mining University, Vladimir Dmitriev ,   Ural State Mining University
Published: October 2020

Research aim and subject. In the last few decades centrifugal separators have been widely used to extract gold. Large water consumption essential in the course of operation is the basic drawback of the method, which in its turn results in increased capital and operational expenditure. As soon as water is becoming increasingly more important resource, the study of centrifugal separation with air turbulization is of great practical significance. The aim of the present research is to study the method of improving technological parameters of centrifugal separation with the use of circulation concentration. Methodology. The proposed method of centrifugal separation has been realized in laboratory conditions at artificial quartz with grain size range of 0.1…+0.01 mm and tungsten powder with grain size range of 0.023…+0.02. Centrifugal separation has been carried out in a laboratory turbulization separator K-200VL equipped with a pneumatic mixing baffle for near-wall layer turbulization with compressed air streams delivered from inside the cone. On completion of each test, concentrate and tailings output has been determined as well as the mass fraction of tungsten within them; tungsten extraction to concentrate has been calculated. Summary. The obtained data prove high effectiveness of centrifugal separation in the mode of light fraction circulation. Centrifugal separation with the use of circulation concentration makes it possible to increase extraction of high-density particles to heavy fraction and increase the quality of heavy fraction, while the use of pneumatic turbulization leads to specific water consumption reduction.
Khandiza polymetallic ore washability study
Authors:   Tashkent State Technical University, Inoiat Umarova , Sevara Aminzhanova ,   Tashkent State Technical University, Gulnarakhon Salizhanova ,   Tashkent State Technical University, Kobil Kalandarov ,   Tashkent State Technical University
Published: October 2020

Introduction. The article considers the results of operations research on the washability of polymetallic ore at Khandiza deposit. The results of the research of material composition are delivered together with the variants of process samples flotation at Khandiza deposit. Research aim is to study the material composition of ore samples and the development of effective technology of polymetallic ore concentration at Khandiza deposit. Methodology. Polymetallic ore of Khandiza deposit has been chosen as research subject. As part of the process various reagents have been used as well as various laboratory facilities, modern physical, physical-chemical and chemical methods of analysis. Research has been carried out in two direction: bulk flotation of all ore minerals with further selection of bulk concentrate to lead, zinc and copper concentrates and direct bulk selective flotation with the production of lead-copper and zinc concentrates in a successive order. Results. The outcomes of ore material composition study have been delivered based on spectral, chemical and rational analysis. It has been determined that industrially valuable ore components are lead, zinc and copper, the contents of which are presented. It has been shown that ore minerals are in tight twinning with nonmetallic minerals, i.e. quartz, sericite, chlorite, carbonate, etc. Summary. As a result of concentration, lead, zinc and copper concentrates have been dressed. The concentrated meet industrial requirements.
Determining the capacity of a bunker as a part of the handling system with combined transport
Authors:   Ural State Mining University, Arkadii Iudin , Viktor Shestakov ,   Ural State Mining University, Vil Saitov ,   Ural State Mining University, Magomed Abdulkarimov ,   Ural State Mining University
Published: October 2020

Introduction. Significant share of the costs for deep quarries is the cost of rock mass reloading from the “assembly transport” to the main transport make up a considerable proportion in open pit development costs. Portable handling systems with bunkers are used, the parameters of which are determined by several methods. Methodology. In this work, when determining the capacity of the bunker, two approaches have been considered: deterministic – transport systems operate at nominal conditions; probabilistic – transport systems operate with their inherent unevenness. The methodology adopted is based on the geometry of the bunker in the configuration of the “inverted obelisk”, as the most productive system. Formulas to calculate the technological and geometric capacity of the bunker have been proposed. The proposed method parameters design takes into account assembly (automobile) transport arrival rate, which is described by the Poisson distribution and railway transport arrival rate described by the distribution of Erlang. Several numerical examples reveal practical application for bunker parameters determination. 112 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 4. 2020 ISSN 0536-1028 Results. The significance of the required additional bunker volumes has been justified in order to make up for cyclic transport vehicles irregular operation within combined transport complexes.
Investigating the variation of the fields of elastic stresses in the rock mass when developing the Peschanskoye deposit
Authors:   Institute of Mining UB RAS, Iakov Lipin , Sergei Sentiabov ,   Institute of Mining UB RAS, Roman Krinitsyn ,   Institute of Mining UB RAS
Published: October 2020

Research aim is to study parameter variations in the stress state of the rock mass to ensure safe and efficient mining of the Peschanskoye magnetite deposit (Northern Ural) to the full depth, which has been carried out by Severopeschanskaya mine since 1958 in a complex of hard rock at a depth of 200 to 700 m. Blind, thick, and steep ore bodies are developed by a block-caving method with ore breaking to a clamped medium. From a depth of 400 m, the field is classified as rock burst hazardous. The first rock burst was recorded in 1981 at a depth of 450 m. Research methodology includes full-scale experimental measurements of the rock and ore mass stress state at accessible depths and horizons of the deposit, establishing patterns of stress growth with depth, as well as long-term (since 1990) geo-deformational monitoring of an untouched rock mass stress level in time. Research results analysis has allowed to establish the patterns in stress-strain state changes during mining. Gradients of gravitational and tectonic stresses growth with depth are determined. Alternating (astrophysical) stresses are highlighted in a special line, the extreme values of which are linked chronologically with various information factors. Conclusions. The determined values of rock mass natural stress state variation parameters in combination with the established stresses around the workings and goafs (technogenic impact) make it possible to take into account the main tempo-spatial factors of the impact made by the mentioned loads when selecting rockburst-safe and effective mining parameters for underground geotechnology both at the top horizons when applying controlled collapse of overlying blind deposits and in the prevention of rockburst hazard in the lower horizons of the developed field
Slope stability analysis of man-made soil body surrounding the abandoned hydraulic dump
Authors:   Kuzbass Head Institute on Designing of Coal Mining and Coal Processing Enterprises “Kuzbassghiproshakht”, Mikhail Karablin , Sergei Prostov ,   T. F. Gorbachev Kuzbass State Technical University
Published: October 2020

Introduction. Pit slope sections directly adjoining hydraulic dumps are characterized by the higher risk of landslide, especially in case of storing dry overburden rock over the hydraulically filled overburden. It is contributed to by the combination of the following factors: increase of the total height of the slope, development within the slope of a waterlogged zone of weakness with complex footprint map and depth configuration; excessive pore pressure within this zone which grows by means of adding dry dump to hydraulically filled rock. To reduce risks connected with man-made soil body slope stability violation, slope stability analysis is carried out based on the results of geological survey, hydrogeological observations and geophysical sounding. Research aims to analyze the stability of the Krasnobrodsky coal pit man-made mass adjoining the Bakhtykhtinsky hydraulic dump based on the 3D geological-geophysical model. Methodology. The authors of the article offered and realized the algorithm of analyzing the stability of slopes based on 3D geological and geophysical models formed by integrating geological, hydrogeological and geophysical data. Results. Based on geological survey data analysis, hydrogeological survey and electric sounding, 3D geological-geophysical model of a man-made soil body adjoining Bakhtykhtinsky hydraulic dump has been built. Slope stability analysis of an actual state of the man-made soil body has been carried out. ISSN 0536-1028 «Известия вузов. Горный журнал», № 5, 2020 55 Summary. In order to develop a 3D geological-geophysical model, in addition to slope geometry, it is necessary to set the boundaries of waterlogged rock in a footprint map and in depth, and monitor pore pressure within this zone. To determine slope section with minimum safety factor it is necessary to carry out cyclic calculation with gradual reduction of approach and design section rotation increment.
Environmental management of mineral resource complex enterprises in the implementation of the circular economy concept
Authors:   Ural State Mining University, Liudmila Mochalova , Olga Sokolova ,   Ural State Mining University
Published: October 2020

Introduction. Enterprises of the mineral resource complex play a significant role in the economy of our country, the development and wealth of which depend on the volume and variety of minerals in the subsurface. At the same time, the activities of enterprises of the mineral resource complex have a significant negative impact on the environment, affecting all its elements. This leads to the need to manage the environmental performance of these enterprises. The aim of this work is to study management technologies that can contribute to closed production cycles creation at enterprises of the mineral complex and real improvement of their environmental performance in terms of implementing the concept of circular economy. The methodology of the research includesthe study, critical evaluation and systematization of technologies for closed production cycles organization and management at enterprises of the mineral resource complex. ISSN 0536-1028 «Известия вузов. Горный журнал», № 6, 2020 85 Research results. The objects of research are such management technologies as: circular business models proposed in the report of the Ellen MacArthur Foundation, schemes-hierarchies of waste management with a different composition of R elements, and logistics techniques for managing waste as specific material flows. These technologies are quite consistent with each other and, when applied together, can help to increase the circular economy development index in the conditions of mineral resource complex enterprises. Conclusion. The coordinated development of management technologies contributes to the implementation of a circular economy concept at the enterprises of the mineral resource complex, as well as their movement towards environmentally sustainable development and ensuring competitiveness.
The high-temperature expansion of the thermal sunset
Authors: Ekstedt Andreas , Löfgren Johan
Published: October 2020

We give a prescription for calculating the high-temperature expansion
of the thermal sunset integral to arbitrary order. We derive all terms
odd in \bm{T}𝐓,
and rederive previous results up to \bm{\mathcal{O}(T^0)}𝒪(𝐓0)
for both bosonic and fermionic thermal sunsets in dimensional
regularisation. We perform analytical and numerical cross-checks.
Intermediate steps involve integrals over three Bessel functions.
Modern aspects of the pathogenesis and treatment of dyspepsia
Authors: Tsukanov V. V. , Vasyutin A. V. , Tonkikh Ju. L.
Published: October 2020

A review of current data suggests that the attention to the problem of dyspepsia is huge. The definition of functional dyspepsia was given in the Rome IV criteria, according to which two of its main options are distinguished – epigastric pain syndrome and postprandial distress syndrome. The term “uninvestigated dyspepsia” is important, which means the presence of dyspepsia symptoms in patients who have not performed diagnostic procedures to identify the organic causes of the pathology. The prevalence of uninvestigated dyspepsia in the world is about 21%. The prevalence of functional dyspepsia is significantly lower than the prevalence of uninvestigated dyspepsia and fluctuates around 10%. The risk factors for dyspepsia are usually tobacco smoking, non-steroidal anti-inflammatory drugs and/or aspirin, and Helicobacter pylori infection. The concept of the pathogenesis of functional dyspepsia undergoes significant changes. By analogy with the pathophysiology of irritable bowel syndrome, lesions of the relationship between the modulation of the cerebral cortex and the signal system of the gastroduodenal zone, the association of sluggish immune inflammation in the duodenum with motility and sensory activity of the stomach are most actively studied. The treatment of functional dyspepsia is a complex problem and changes after new ideas about its pathogenesis. Modern meta-analyzes have made it possible to expand the indications for the proton pump inhibitors administration, which can be actively used not only for the treatment of epigastric pain syndrome, but also for postprandial distress syndrome. Along with the required Helicobacter pylori eradication, there are reasons for the use of probiotics and antibiotics for the dyspepsia treatment.
Pantoprazole niche among the GERD-medicines
Authors: Starodubtsev A. K. , Kurguzova D. O. , Demchenkova E. Yu. , Drozdov V. N. , Serebrova S. Yu.
Published: October 2020

Main groups of antisecretory drugs used in the treatment of acid-dependent diseases, including gastroesophageal reflux disease (GERD), are described in a review. Mechanisms of activation, degradation and inactive metabolites formation of proton pump inhibitors (PPIs) – final elements of acid production blockage – are considered in detail. Special attention is paid to the presence of PPIs’ derivatives with different functional activity: inactive derivatives, active and inactive metabolites. Topographic description of these derivatives, their significance in terms of an effect on bioavailability, clinical effectiveness and a potential of PPIs interactions with other administered drugs. The combined decision-making algorithm in the presence of gastroesophageal reflux disease symptoms is presented, compiled on the basis of the most authoritative current recommendations. This algorithm provides for the use of PPIs in standard doses once a day for 4–8 weeks with a possible dose escalation in a case of ineffectiveness. If treatment with high doses of PPIs is ineffective, a set of measures is needed to identify the causes of this inefficiency and to choose additional medical strategy. Depending on the clinical situation, after erosions epithelization the treatment can be stopped, used on demand, prolonged in the intermittent or supportive forms. Particular attention is paid to the Panum® drug, which has proven its effectiveness in patients with different degrees of reflux esophagitis. The availability of dosage forms for prescription and over-the-counter leave allows ensuring its comfortable and unhindered purchase by patients and eliminating excessive burden on the healthcare system.
Combined herbal medicine for chronic alcoholic liver disease
Authors: Skvortsov V. V. , Lunkov M. V. , Levitan М. V.
Published: October 2020

Alcohol abuse with resultant alcoholic liver disease (ALD) are a leading cause of morbidity and mortality worldwide. Due to absence of clinical symptoms of the disease in the early stages, it is diagnosed in the later stages with higher complications and mortality rates. Diagnosis of ALD requires a better determination of life history and prognostic factors, as well as the search for reliable non-invasive techniques. Early detection of alcoholic steatohepatitis in primary care settings and subsequent interventions will facilitate the satisfaction of this requirement. Despite some important advances in understanding the pathogenesis and clinical features of ALD, the past 40 years have not seen significant advances in the therapy. The long-term alcohol abstinence is the main therapy for ALB patients, regardless of the disease stage. It is associated with improved clinical outcomes across the ALD spectrum: from asymptomatic early cases to complicated severe cases. Clinical ultimate outcomes depend on the ALD stage. The ultimate outcomes are associated with normalisation of abnormal laboratory test results and reduction in liver fibrosis in compensated patients. These ultimate outcomes can be monitored using non-invasive tools, but current medical interventions are largely limited and ineffective. Supportive therapy forms the basis of the treatment, it is worth paying special attention to combined herbal medicines as less toxic ones with single contraindications and consistent with the desire of many patients to use natural preparations.
THE CONSUMPTION OF FRUITS AS A POTENTIAL ALTERNATIVE TO ACCELERATE THE RECOVERY PROCESS AFTER HIGH INTENSITY EXERCISE
Authors: Skinner Sonja , Wade Madison , Iacobacci Courtney , Hutcherson Roderick , Santos Julia Matzenbacher dos
Published: October 2020

A prevalent desire in the sports world is the acceleration of post-exercise recovery; therefore, many studies have examined the use of dietary supplements before, during, and after exercise to determine the positive effects on athletes as a catalyst for recovery. Overall, studies have found that adaptations to regular exercise promotes advantageous reactions in the body to boost the immune system, prevent dyslipidemia and muscle loss, and increase bone density. However, exercise at an increased intensity or duration usually performed under competitive settings can deplete glycogen stores, increase lactic acid, form an excess amount of reactive oxygen species (ROS), increase tissue damage, and decrease immunologic function. This review incorporated studies that tested the use of fruits as a strategy to attenuate the period by which the body buffers the increase in acidity and inflammation, scavenge ROS and to regenerate muscle damage after high intensity exercise. Therefore, the effect of fruit intake rich in vitamins and those containing polyphenolic ring-based flavonoids and carbohydrates was discussed. Nutrient supplementation can enhance recovery after high intensity exercise, particularly fruits of red-blue color such as cherries and blueberries seem to decrease oxidative stress, inflammation, and muscle damage. In summary, each fruit has specific targets to offset body regeneration, avoid over training, and improve overall performance.
USO DE UM SCANNER DE MESA E ESPUMA DE POLIURETANO PARA QUANTIFICAÇÃO DE FERRO TOTAL EM CÁPSULAS DE SUPLEMENTOS ALIMENTARES
Authors: Feiteira Fernanda , Barreirosa João , Pacheco Wagner
Published: October 2020

In this work, an alternative and low-cost technique for the extraction and quantification of Fe (total) from food supplements by digital image analysis is shown. The method is based on the complexation of Fe ions in solution with the 8-hydroxyquinoline ligand, forming a colored complex that is extractable from aqueous solution to polyurethane foam, coloring this one, which was initially white, to brown. After the acquisition and treatment of the digital image generated by the foam, the quantification of Fe is performed. Interference and recovery tests show that the method is not affected by concomitants in the sample. The method was applied to 3 different types of dietary supplements, and these results were compared to those obtained by FAAS, showing statistical equivalence. The limits of quantification obtained in this work was 1.78 μmol L-1, the limit of detection was 0.53 μmol L-1, the accuracy was 97.5 + 4.8% and the precision was 8.45%. The analytical curve was linear from 2.0 to 10.0 μmol L-1, with a r2 of 0.9975.