bluuebunny/crossref_metadata_2025 huggingface dataset:
Craniofacial anthropometric investigation of relationships between the nose and nasal aperture using 3D computed tomography of Korean subjects
Authors: Ryu Joon Yeol , Park Ki-Su , Kim Min-Ji , Yun Ji-Su , Lee U-Young , Lee Sang-Seob , Roh Byung-Yoon , Seo Jeong-Uk , Choi Chang-Un , Lee Won-Joon
Published: September 2020

This study investigated the relationships of morphology and locations of the nose and nasal aperture by using major craniofacial landmarks on the human skull and face for craniofacial reconstruction/approximation of Koreans. In the frontal view, the positions of bony landmarks on the skull, including the nasal aperture, were correlated with the positions of nasal landmarks vertical to the transverse plane. In profile, the positions of bony landmarks on the skull were correlated with the positions of nasal landmarks horizontal to the coronal plane. Overall, 26 of the 76 measurements demonstrated significant correlations between the corresponding landmarks on the nose and nasal aperture. Simple regression equations were produced from the results. This study showed that the nose and nasal aperture are significantly related to each other in terms of their morphology and location in Koreans. The prediction guidelines, produced as regression formulas, can be applied to craniofacial reconstruction/approximation and bio-anthropological research of Korean skulls. The study results can also be used clinically in rhinoplasty and nasal reconstruction surgery.
Carbon fiber-reinforced pedicle screws reduce artifacts in magnetic resonance imaging of patients with lumbar spondylodesis
Authors: Fleege Christoph , Makowski Marcus , Rauschmann Michael , Fraunhoffer Katharina Luise , Fennema Peter , Arabmotlagh Mohammad , Rickert Marcus
Published: September 2020

The study investigated whether the use of carbon fiber-reinforced PEEK screw material (CF-PEEK) can reduce magnetic resonance imaging (MRI) artifact formation. Two consecutive groups of patients were treated for degenerative spinal disorders of the lumbar spine with dorsal transpedicular spinal fusion. The first group (n = 27) received titanium pedicle screws. The second group (n = 20) received CF-PEEK screws. All patients underwent an MRI assessment within the first four postoperative weeks. For each operated segment, the surface of the artifact-free vertebral body area was calculated as percentage of the total vertebral body. For each implanted segment, the assessability of the spinal canal, the neuroforamina, and the pedicle screws, as well as the surrounding bony and soft-tissue structures was graded from 1 to 5. A mean artifact-free vertebral body area of 48.3 ± 5.0% was found in the in the titanium group and of 67.1 ± 5.6% in the CF-PEEK group (p ≤ 0.01). Assessability of the lumbar spine was significantly improved for CF-PEEK screws (p ≤ 0.01) for all measurements. CF-PEEK pedicle screws exhibit smaller artifact areas on vertebral body surfaces and their surrounding tissues, which improves the radiographic assessability. Hence, CF-PEEK may provide a diagnostic benefit.
Author Correction: Generation and Manipulation of Superoscillatory Hotspots Using Virtual Fourier Filtering and CTF Shaping
Authors: Sanjeev Abhijit , Shabairou Nadav , Attar Arrad , Scherbaum Daniel , Kapellner Yuval , Sinvani Moshe , Zalevsky Zeev
Published: September 2020

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Age and environment-related differences in gait in healthy adults using wearables
Authors: Czech Matthew D. , Psaltos Dimitrios , Zhang Hao , Adamusiak Tomasz , Calicchio Monica , Kelekar Amey , Messere Andrew , Van Dijk Koene R. A. , Ramos Vesper , Demanuele Charmaine , Cai Xuemei , Santamaria Mar , Patel Shyamal , Karahanoglu F. Isik
Published: September 2020

Technological advances in multimodal wearable and connected devices have enabled the measurement of human movement and physiology in naturalistic settings. The ability to collect continuous activity monitoring data with digital devices in real-world environments has opened unprecedented opportunity to establish clinical digital phenotypes across diseases. Many traditional assessments of physical function utilized in clinical trials are limited because they are episodic, therefore, cannot capture the day-to-day temporal fluctuations and longitudinal changes in activity that individuals experience. In order to understand the sensitivity of gait speed as a potential endpoint for clinical trials, we investigated the use of digital devices during traditional clinical assessments and in real-world environments in a group of healthy younger (n = 33, 18–40 years) and older (n = 32, 65–85 years) adults. We observed good agreement between gait speed estimated using a lumbar-mounted accelerometer and gold standard system during the performance of traditional gait assessment task in-lab, and saw discrepancies between in-lab and at-home gait speed. We found that gait speed estimated in-lab, with or without digital devices, failed to differentiate between the age groups, whereas gait speed derived during at-home monitoring was able to distinguish the age groups. Furthermore, we found that only three days of at-home monitoring was sufficient to reliably estimate gait speed in our population, and still capture age-related group differences. Our results suggest that gait speed derived from activities during daily life using data from wearable devices may have the potential to transform clinical trials by non-invasively and unobtrusively providing a more objective and naturalistic measure of functional ability.
Equilibrium molecular structure and spectra of 6-methyl-1,5-diazabicyclo[3.1.0]hexane: joint analysis of gas phase electron diffraction, quantum chemistry, and spectroscopic data
Authors: Khaikin Leonid S. , Ageev Georgiy G. , Rykov Anatoliy N. , Grikina Olga E. , Shishkov Igor F. , Kochikov Igor V. , Kuznetsov Vladimir V. , Makhova Nina N. , Bukalov Sergei S. , Leites Larisa A.
Published: September 2020

For the first time, the molecular structure of 6-methyl-1,5-diazabicyclo[3.1.0]hexane was determined and its NMR and vibrational spectra were studied.
Terahertz time-domain absorption spectra of Cu(i) complexes bearing tetraphosphine ligands: the bridge between the C–H⋯π and π⋯π interactions and photoluminescence properties
Authors: Pan Xun , Kuang Xiao-Nan , Zhu Ning , Wang Guo , Yang Yu-Ping , Liu Jian-Ming , Li Zhong-Feng , Xin Xiu-Lan , Han Hong-Liang , Jin Qiong-Hua , Ren Zhi-Gang , Zhang Jiang-Wei
Published: September 2020

The terahertz spectrum bridges the luminescence and C–H⋯π and π⋯π interactions of Cu(i) complexes.
Cytotoxic (cis,cis-1,3,5-triaminocyclohexane)ruthenium(ii)-diphosphine complexes; evidence for covalent binding and intercalation with DNA
Authors: Wise Dan E. , Gamble Aimee J. , Arkawazi Sham W. , Walton Paul H. , Galan M. Carmen , O'Hagan Michael P. , Hogg Karen G. , Marrison Joanne L. , O'Toole Peter J. , Sparkes Hazel A. , Lynam Jason M. , Pringle Paul G.
Published: September 2020

New Ru complexes are described that have the potential to interact with DNA in the three ways shown and this may be the reason why some of these complexes have such high antiproliferative activity.
Biologically inspired catalyst for electrochemical reduction of hazardous hexavalent chromium
Authors: Aralekallu Shambhulinga , Palanna Manjunatha , Hadimani Sowmyashree , Prabhu C. P. Keshavananda , Sajjan Veeresh A. , Thotiyl Musthafa Ottakam , Sannegowda Lokesh Koodlur
Published: September 2020

A schematic diagram of the electrochemical reduction of Cr(vi) using a modified electrode.
Theoretical design of molecularly imprinted polymers based on polyaniline and polypyrrole for detection of tryptophan
Authors: Bagdžiūnas Gintautas
Published: September 2020

Monte Carlo and DFT methods were applied to study the polypyrrole and polyaniline-based molecularly imprinted polymers for detection of l-tryptophan.
An endoplasmic reticulum-targeting and ratiometric fluorescent probe for hypochlorous acid in living cells based on a 1,8-naphthalimide derivative
Authors: Ma Qiujuan , Wang Chunyan , Mao Guojiang , Tian Meiju , Sun Jingguo , Feng Suxiang
Published: September 2020

A novel reticulum-targeting and ratiometric fluorescent probe for determining hypochlorous acid has been developed.
Electrochemical water splitting exploration of MnCo2O4, NiCo2O4 cobaltites
Authors: Rani B. Jansi , Yuvakkumar R. , Ravi G. , Hong S. I. , Velauthapillai Dhayalan , Guduru Ramesh K. , Thambidurai M. , Dang Cuong , Al-onazi Wedad A. , Al-Mohaimeed Amal M.
Published: September 2020

One-step solvothermal synthesis is used to produce Mn and Ni based cobaltites.
Porphyrazines with annulated diazepine rings. 5. Near-IR-absorbing tetrakis(6,7-dihydro-1H-1,4-diazepino)porphyrazines and effects of acid solvation on their spectral properties
Authors: Skvortsov Ivan A. , Fazlyeva Alina M. , Khodov Ilya A. , Stuzhin Pavel A.
Published: September 2020

Novel porphyrazines bearing fused 6,7-dihydro-1H-1,4-diazepine rings were synthesized and their spectral response on the change of medium acidity was demonstrated.
Gold(i)–NHC-catalysed synthesis of benzofurans via migratory cyclization of 2-alkynylaryl ethers
Authors: Le Quang , Dillon Christopher C. , Lichtenstein Dana A. , Pisor Jeremy W. , Closser Kristina D. , Muchalski Hubert
Published: September 2020

Digold(i)–NHC complex catalyzes an intramolecular carboalkoxylation reaction of p-methoxybenzyl ethers of 2-ethynylaryl phenols to give 2,3-disubstituted benzofurans in good yields.
Diastereoselective synthesis and conformational analysis of 4,5-difluoropipecolic acids
Authors: Chen Suo , Ruan Yao , Lu Ji-Liang , Hunter Luke , Hu Xiang-Guo
Published: September 2020

Stereoselectively-fluorinated analogs of pipecolic acid have been investigated through a combined theoretical and experimental approach.
Unusual bridged angucyclinones and potent anticancer compounds from Streptomyces bulli GJA1
Authors: Kim Jung Wha , Kwon Yun , Bang Sunghee , Kwon Ha Eun , Park Sunwoo , Lee Yeonhee , Deyrup Stephen T. , Song Gwonhwa , Lee Dongho , Joo Hwang-Soo , Shim Sang Hee
Published: September 2020

Two new unusual angucyclinones (1 and 2) with intramolecular ether bridges with two known ones (3 and 4) were isolated from Streptomyces bulli. Compound 3 exhibited potent anti-proliferative and anti-virulent activities against MRSA.
Orange super-long persistent luminescent materials: (Sr1−xBax)3SiO5:Eu2+,Nb5+
Authors: Wang Zhizhen , Song Zhen , Liu Quanlin
Published: September 2020

Orange persistent luminescent materials (Sr1−xBax)3SiO5:Eu2+,Nb5+ exhibit more than 20 h after-glow time.
Multifunctional AIE-ESIPT dual mechanism tetraphenylethene-based Schiff base for inkless rewritable paper and a colorimetric/fluorescent dual-channel Zn2+ sensor
Authors: Sun Hao , Jiang Yan , Nie Jing , Wei Jianhua , Miao Baoxi , Zhao Yun , Zhang Lifang , Ni Zhonghai
Published: September 2020

An AIE-ESIPT-active compound was rationally designed and facilely developed, which exhibits multifunctional applications in inkless rewritable paper, a colorimetric/fluorescent dual-channel sensor for Zn2+ ions and fluorescence imaging of Zn2+ ions in living cells.
Palladium-catalyzed reductive cross-coupling between α-bromo carboxamides and terminal alkynes
Authors: Aliyu Muinat A. , Li Bowen , Yang He , Tang Wenjun
Published: September 2020

A Pd-catalyzed reductive cross-coupling between α-bromo carboxamides and terminal alkynes was developed featuring a radical pathway and distinct from the Sonogashira coupling.
Impact of gelation method on thixotropic properties of phenylalanine-derived supramolecular hydrogels
Authors: Quigley Elena , Johnson Jade , Liyanage Wathsala , Nilsson Bradley L.
Published: September 2020

Supramolecular hydrogels formed by noncovalent self-assembly of low molecular weight (LMW) agents are promising next-generation biomaterials.
Correction: Printed, cost-effective and stable poly(3-hexylthiophene) electrolyte-gated field-effect transistors
Authors: Blasi Davide , Viola Fabrizio , Modena Francesco , Luukkonen Axel , Macchia Eleonora , Picca Rosaria Anna , Gounani Zahra , Tewari Amit , Österbacka Ronald , Caironi Mario , Kovacs Vajna Zsolt M. , Scamarcio Gaetano , Torricelli Fabrizio , Torsi Luisa
Published: September 2020

Correction for ‘Printed, cost-effective and stable poly(3-hexylthiophene) electrolyte-gated field-effect transistors’ by Davide Blasi et al., J. Mater. Chem. C, 2020, DOI: 10.1039/d0tc03342a.
Predictors of Treatment Response for Preschool Children With Developmental Language Disorder
Authors: Kapa Leah L. , Meyers-Denman Christina , Plante Elena , Doubleday Kevin
Published: September 2020

Purpose

Enhanced Conversational Recast treatment is an effective intervention for remediating expressive grammatical deficits in preschool-age children with developmental language disorder, but not all children respond equally well. In this study, we sought to identify which child-level variables predict response to treatment of morphological deficits.

Method

Predictor variables of interest, including pre-intervention test scores and target morpheme production, age, and mother's level of education (proxy for socio-economic status) were included in analyses. The sample included 105 children (
M
= 5;1 [years;months]) with developmental language disorder who participated in 5 weeks of daily Enhanced Conversational Recast treatment. Classification and regression tree analysis was used to identify covariates that predicted children's generalization of their trained grammatical morpheme, as measured by treatment effect size
d
.

Results

Our analysis indicates that the Structured Photographic Expressive Language Test–Preschool 2 (SPELT-P 2) scores and the Peabody Picture Vocabulary Test–Fourth Edition scores significantly predicted the degree of benefit a child derived from Enhanced Conversational Recast treatment. Specifically, a SPELT-P 2 score above 75 (but still in the impaired range, < 87) combined with a high Peabody Picture Vocabulary Test–Fourth Edition score (> 100) yielded the largest treatment effect size, whereas a SPELT-P 2 score below 75 predicted the smallest treatment effect size. Other variables included in the model did not significantly predict treatment outcomes.

Conclusions

Understanding individual differences in response to treatment will allow service providers to make evidence-based decisions regarding how likely a child is to benefit from Enhanced Conversational Recast treatment and the expected magnitude of the response based on the child's background characteristics.
The ALPINE-ALMA [CII] survey
Authors: Fudamoto Y. , Oesch P. A. , Faisst A. , Béthermin M. , Ginolfi M. , Khusanova Y. , Loiacono F. , Le Fèvre O. , Capak P. , Schaerer D. , Silverman J. D. , Cassata P. , Yan L. , Amorin R. , Bardelli S. , Boquien M. , Cimatti A. , Dessauges-Zavadsky M. , Fujimoto S. , Gruppioni C. , Hathi N. P. , Ibar E. , Jones G. C. , Koekemoer A. M. , Lagache G. , Lemaux B. C. , Maiolino R. , Narayanan D. , Pozzi F. , Riechers D. A. , Rodighiero G. , Talia M. , Toft S. , Vallini L. , Vergani D. , Zamorani G. , Zucca E.
Published: September 2020

We present dust attenuation properties of spectroscopically confirmed star forming galaxies on the main sequence at a redshift of ∼4.4 − 5.8. Our analyses are based on the far infrared continuum observations of 118 galaxies at rest-frame 158μm obtained with the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [CII] at Early times (ALPINE). We study the connection between the ultraviolet (UV) spectral slope (β), stellar mass (M⋆), and infrared excess (IRX =LIR/LUV). Twenty-three galaxies are individually detected in the continuum at > 3.5σsignificance. We perform a stacking analysis using both detections and nondetections to study the average dust attenuation properties atz ∼ 4.4 − 5.8. The individual detections and stacks show that the IRX–βrelation atz ∼ 5 is consistent with a steeper dust attenuation curve than typically found at lower redshifts (z <  4). The attenuation curve is similar to or even steeper than that of the extinction curve of the Small Magellanic Cloud. This systematic change of the IRX–βrelation as a function of redshift suggests an evolution of dust attenuation properties atz >  4. Similarly, we find that our galaxies have lower IRX values, up to 1 dex on average, at a fixed mass compared to previously studied IRX–M⋆relations atz ≲ 4, albeit with significant scatter. This implies a lower obscured fraction of star formation than at lower redshifts. Our results suggest that dust properties of UV-selected star forming galaxies atz ≳ 4 are characterised by (i) a steeper attenuation curve than atz ≲ 4, and (ii) a rapidly decreasing dust obscured fraction of star formation as a function of redshift. Nevertheless, even among this UV-selected sample, massive galaxies (logM⋆/M⊙ >  10) atz ∼ 5 − 6 already exhibit an obscured fraction of star formation of ∼45%, indicating a rapid build-up of dust during the epoch of reionization.
The ALPINE-ALMA [CII] survey
Authors: Gruppioni C. , Béthermin M. , Loiacono F. , Le Fèvre O. , Capak P. , Cassata P. , Faisst A. L. , Schaerer D. , Silverman J. , Yan L. , Bardelli S. , Boquien M. , Carraro R. , Cimatti A. , Dessauges-Zavadsky M. , Ginolfi M. , Fujimoto S. , Hathi N. P. , Jones G. C. , Khusanova Y. , Koekemoer A. M. , Lagache G. , Lemaux B. C. , Oesch P. A. , Pozzi F. , Riechers D. A. , Rodighiero G. , Romano M. , Talia M. , Vallini L. , Vergani D. , Zamorani G. , Zucca E.
Published: September 2020

Aims. We present the detailed characterisation of a sample of 56 sources serendipitously detected in ALMA band 7 as part of the ALMA Large Program to INvestigate CII at Early Times (ALPINE). These sources, detected in COSMOS and ECDFS, have been used to derive the total infrared luminosity function (LF) and to estimate the cosmic star formation rate density (SFRD) up to z ≃ 6.

Methods. We looked for counterparts of the ALMA sources in all the available multi-wavelength (from HST to VLA) and photometric redshift catalogues. We also made use of deeper UltraVISTA and Spitzer source lists and maps to identify optically dark sources with no matches in the public catalogues. We used the sources with estimated redshifts to derive the 250 μm rest-frame and total infrared (8–1000 μm) LFs from z ≃ 0.5 to 6.

Results. Our ALMA blind survey (860 μm flux density range: ∼0.3–12.5 mJy) allows us to further push the study of the nature and evolution of dusty galaxies at high-z, identifying luminous and massive sources to redshifts and faint luminosities never probed before by any far-infrared surveys. The ALPINE data are the first ones to sample the faint end of the infrared LF, showing little evolution from z ≃ 2.5 to z ≃ 6, and a “flat” slope up to the highest redshifts (i.e. 4.5 <  z <  6). The SFRD obtained by integrating the luminosity function remains almost constant between z ≃ 2 and z ≃ 6, and significantly higher than the optical or ultra-violet derivations, showing a significant contribution of dusty galaxies and obscured star formation at high-z. About 14% of all the ALPINE serendipitous continuum sources are found to be optically and near-infrared (near-IR) dark (to a depth Ks ∼ 24.9 mag). Six show a counterpart only in the mid-IR and no HST or near-IR identification, while two are detected as [C II] emitters at z ≃ 5. The six HST+near-IR dark galaxies with mid-IR counterparts are found to contribute about 17% of the total SFRD at z ≃ 5 and to dominate the high-mass end of the stellar mass function at z >  3.
About the effectiveness of counter blasting with chamber mining system
Authors: Sokolov Igor , Antipin Yuri , Baranovsky Kirill , Rozhkov Artem
Published: September 2020

When underground mining of Ural copper deposits with a chamber mining system, an urgent scientific and practical task is to increase the productivity of loadingdelivery machines for the ore drawing from secondary chambers. The technogenic disturbance of the massif of such chambers in combination with the non-alternative use of a blasthole ring scheme of breaking leads to an increased output of oversized fractions. With an increase of oversized ore output, operating costs for the drawing and delivery of ore increase, tire wear, fuel and lubricants consumption increases. In this article, the possibility of reducing the oversize ore output in secondary chambers by using counter blasting of the breaking layers is considered. As a result of the research, the parameters of effective counter blasting with blasthole ring charges were established, namely, the distance between the working faces in the chamber, the angle of ore pieces meeting and the line of least resistance.
On the issue of defining safe distances and overpressure under impact of shock air blast wave (Magnesitovaya mine)
Authors: Zharikov Sergey , Kutuev Vyacheslav
Published: September 2020

As the depth of mining increases, attention to the preservation of mine workings and mining blasting is steadily growing. Technological methods of effective mineral development are often limited by dynamic blasting impact causing short-period fluctuations in the rock mass. Therefore, correct explosion impact identification, to a great extent, determines effective mining trends. Some results of researches for minimum blasting impact on mining workings are given in the article. Calculation of safe distances and excess pressure at shock air impact of technological explosions on the Magnezitovaya mine personnel was made. The calculation was made for the 15.5 m mine working section, with two conditions of the total section of the mine workings adjacent to the face of 15.5 m and 31 m with distances of 50 m and 100 m. Overpressure was also calculated for a total cross-section of 15.5 m and distances of 150 and 200 m. It was determined that the safe distance for people under overpressure conditions at the shock air wave front, depending on breaking schemes, is in the range of 150-200 m. The urgency of this research is to ensure industrial safety of underground mining operations.
Active carbons for selective flotation of primary gold-copper-porphyry ore
Authors: Gurman Margarita , Ashimbayev Abdakim
Published: September 2020

The results of a study on the flotation of gold-copper-porphyry ore are presented. The quality of the obtained concentrates is confirmed by the efficiency of using activated carbon to reduce the excess of reagents accumulating in the collective concentrates. Detailed studies of concentrates of copper selection using scanning electron microscopy revealed the presence of carbon in their composition. On the surface of gold and chalcopyrite particles, thin coal deposits and coatings were observed. Flotation of particles of gold and sulfide minerals can probably be improved by naturally hydrophobic or hydrophobized coal particles. “Carbon” coatings are selective with respect to the surface of sulfide minerals. No coal coatings were found on the surface of quartz grains and crystals.
Development of a new lining ball mill model for commercial component preservation
Authors: Lebedev Ivan
Published: September 2020

At present the main aggregates for fine grinding of gold ores are ball and similar mills, in which in addition to mass ore grinding, deformation and free gold destruction occurs. The article aims to study the process of deformation of free gold extracted during grinding and to develop a ball mill design to preserve the commercial component.
Integrated processing of ferriferous materials in blank production for mechanical engineering facilities
Authors: Predein Valery , Popov Artyom , Komarov Oleg , Zhilin Sergey
Published: September 2020

The paper considers the possibility of reducing the use of crude ore for metal product by using aluminothermy, which facilitates effective integrated processing of metal waste generated by engineering and metallurgy facilities in the form of mill scale, ferrous and non-ferrous metal swarf with simultaneous castings production. The paper studies the impact patterns of thermite components ratios on the parameters of extracting chemical elements from the source components, metal phase output and its chemical composition. The possible applications for experimental alloys resulting from controlled exothermic reactions are determined for supplying castings and melting stock to blank production for mechanical engineering facilities.
Technological studies of the use of modifiers in the flotation of calcium-containing minerals
Authors: Shepeta Elena , Ignatkina Vladislava , Samatova Luiza
Published: September 2020

Using samples of skarn scheelite-sulfide ore from the Vostok-2 deposit, studies were carried out to model combinations of increased dose of inorganic modifiers (sodium carbonate, water glass, sodium sulfide) based on publications by foreign researchers on the achieved positive result in increasing the contrast of the mineral surfaces of scheelite and calcite and their floatability. Testing was carried out according to the standard flowsheet on tap and recycled water. Oxyhydryl collector was sodium oleate of technical acid B-115, dose 250 + 50 g/t. The order of feeding modifiers (sequential supply and combination of a mixture of sodium carbonate (bicarbonate) + water glass), the effect of the temperature of the pulp upon contact, the dose of modifiers and the ratio of components in the mixture were studied. The dose of water glass varied from 350 to 1450 g/t, sodium carbonate (bicarbonate) varied from 0 to 11.5 kg/t, sodium sulfide up to 4.9 kg / t. With increased dose of inorganic modifiers, it was not possible to achieve selective depression of calcite and apatite while maintaining effective scheelite flotation. The use of sodium bicarbonate in comparison with sodium carbonate, at the same flow rates, creates a less alkaline pH in the flotation pulp, which leads to an increase in the concentration of hardness ions [Са2+, Mg2+] and overdose of the collector. Using combinations of reagents: sodium carbonate (bicarbonate) + water glass, sodium sulfide + sodium hydroxide + water glass, even with a slight increase in the dose of water glass in the mixture, after heat treatment, concentrates of lower quality were obtained, with increased losses of scheelite compared to the factory mode according to the Petrov method.
Clustering of protons as the main factor in increasing the activity of leaching solutions at their electrochemical and photochemical processing
Authors: Sekisov Arthur , Rasskazova Anna
Published: September 2020

The theoretical substantiation for the proton clustering process during electrochemical and photochemical processing of technological solutions is provided in the paper. This process provides a significant increase in the efficiency of leaching of gold from refractory ores. It was proposed that the chemical processes in aqueous solutions occur not only due to electronic (interelectronic) interactions, but also as a result of proton-electron interactions. The hypothesis is substantiated. Proton-electron interactions play an important role in the destruction and formation of chemical bonds between the solvent and the solute, as well as between dissolved substances. Compounds with a polymer-like structure can be formed during the electrolysis of aqueous solutions of different reagents, containing oxygen dimers (O-O). Hydrated cluster shell of active water molecules is formed around these polymer-like compounds. A metastable region of clustered protons is formed. Water-gas emulsion is formed during electrolysis and irradiatin with UV light. Highly active oxidants such as atomic oxygen, superoxide radical ion, ozone, and hydroxyl radical are synthesized in the gas bubbles. These compounds intensify protonation processes during hydration. The results of experiments on column activation leaching of dispersed gold from large-volume sample of refractory ore from the Pogromnoye deposit prove the validity of the theoretical substantiations.
Mineralogical and morphometric aspects of the rock analysis as the basis for choosing a scheme for ore preparation
Authors: Duryagina Asiya , Heide Gerhard , Talovina Irina , Bravo Arturo
Published: September 2020

The complexity of deep processing of fine-grained and refractory mineral raw materials is determined by the difficulty of disclosing aggregates of ore components during disintegration and extracting them into commercial products of standard quality. The main task of the disintegration of such ores is to destroy the object along the phase boundaries without overgrinding while minimizing energy costs. To implement selective disintegration, a precise study of the properties of the mineral components of the ore is necessary. However, there are no systematic data on the effect and relationship of the mineralogical-technological, structural-textural and physical-technical properties of minerals, rocks and ores with the processes of selective disintegration. The article presents the results of computer microtomographic and optical-microscopic studies of the structural and textural characteristics of typical sulfide copper-nickel ores using a SkyScan-1173 microtomograph from Bruker (Belgium), as well as a specialized, accredited as a measuring tool, Thixomet Pro software (Russia). The studies made it possible to identify automatically 19 morphometric parameters of ore grains in three mutually perpendicular sections, the most informative of which were the grain size of individual ore minerals, their perimeter, distance between grains and grain shape (sphericity, edge roughness, and others). The obtained quantitative characteristics of the structural and textural parameters, the analysis of the granulometric composition of the grains of ore minerals make it possible to assess the possibility of using selective grinding at various stages of ore preparation.
Research and technological testing of ores with dispersed gold of the Yellow Jacket Deposit
Authors: Korolev Slava , Lavrov Alexsander
Published: September 2020

The article discusses the mineral and geochemical features of the yellow Jacket ore Deposit located in Clark County, Nevada. Тhe Deposit differs significantly in many mineral and geochemical features from the deposits of dispersed gold ores belonging to the so-called Karlin formation type in compacted and locally weakly metamorphosed strata of carbonate rocks, mudstones and carbonated shales (carbonated turbidites). Positive results of analyses, including those with a cupellation (gravimetric) termination, were obtained in laboratories using non-standard approaches to sample preparation. Based on the working hypothesis of finding chemically bound dispersed gold in hematite-goethite films on the surface of quartz-chalcedony particles and internal microcracks, it was proposed to use active metastable chlorine-oxygen compounds to break the chemical bonds between iron atoms and clustered dispersed gold atoms and transfer it to a solution. In the liquid phase of the ore pulp with reagents added to it , after its activation treatment, the gold content, depending on its duration and intensity, varied in the range from 1.2 to 30 mg/l( at W:T=1:1).
Increasing the attractiveness of investment projects in the mining industry of the Russian Far East
Authors: Arkhipova Yuliya , Leontiev Rudolf
Published: September 2020

The article is devoted to the issue of the possibility of economic development of the mining industry in the subjects of the Far Eastern Federal District (FEFD) and the impact of investment projects. With the vast wealth and diversity of mineral resources, their involvement in the national economy is an essential factor in the industrialization and successful development of the regions. In the case of the establishment of processing plants, for a number of minerals, the region could provide its own needs, as well as the countries, finished products from it, and develop an export focus. The article considers the export orientation of the mineral and raw materials complex of Russia and the constituent entities of the Russian Federation, as well as the commodity structure of exports of the regions of the FEFD. Special attention is paid to the implementation of major regional investment projects, which are important for the development of the regions. So, it is proposed to implement a major project in the form of an integrated mining and metallurgical complex due to the fact that the region needs its own ferrous metallurgy. The calculations carried out (in various versions: basic, in the conditions of the territory of advanced development (TAD), without the costs of infrastructure creation) showed that the implementation of the project is cost-effective, but due to the high costs, the support of the state is necessary.
Substantiation of parameters of the energy-efficient water outflow scheme of underground mine using energy of hydro-flows
Authors: Rylnikova Marina , Knyazkin Egor
Published: September 2020

The purpose of the study is development of a structural scheme of mining-engineering system designed to ensure energy performance of the mine water outflow system. The article reveals the need for research aimed at improving the energy efficiency of the water outflow system by comparing the dynamics of electrical energy consumption and commercial output volume at the mining industry enterprises. A brief overview of the global experience in compensation for growth of electric energy consumption under more difficult mining conditions and mining depth due to the use of innovative technological solutions in the mine water outflow system is given. Scientific novelty of the research is the use of energy, which is bypassed to the underlying horizons of the underground mine, of technological and natural waters to improve efficiency of pumping units by using boost pressure and automated processes of cleaning hydraulic flows from sludge deposits, as well as to reduce the overall operational costs in the water outflow system. The energy-efficient scheme of mine water outflow system that increases energy efficiency of a mining enterprise is substantiated.
Mining logistics systems: classification, identification, innovation
Authors: Leontiev Rudolf , Barchukov Alexey , Nemchaninova Maria
Published: September 2020

The article presents a classification of existing and prospective mining logistics systems in the economy of the Russian Far East, designed to determine the directions of innovative processes in the field of technical and technological equipment of transport infrastructure, ensuring the effective functioning of these systems. The most significant branches of the regional economy for the formation of innovative mining and logistics systems are identified. Statistical (geographical) and evaluative (socio-organizational) classification features and their categories (classes) are proposed to identify the most economically significant mining and logistics systems in the region and make optimal management decisions to update the technical and technological equipment of transport and warehouse infrastructure facilities serving these systems.
Influence of structural and textural features of ores and rocks on mine dust explosion hazard during development of pyrite deposits
Authors: Rylnikova Marina , Fedotenko Viktor , Mitishova Natalia
Published: September 2020

In the practice of mining works, sulfide-dust explosions often occur during underground development of pyrite ore deposits: copper-zinc, lead-zinc, copper-nickel, antimony, and others. This makes it necessary to conduct researches aimed at improvement of methods for studying the explosive properties of sulfide dust and development of industrial and environmental safety requirements for mining operations. Currently, there is no generally accepted state-approved regulatory procedure for assessment of sulfide dust explosion hazards during underground mining operations in Russia. Assessment of the type and concentration of mine sulfide dust in the underground mine atmosphere is vitally important for solving this problem. In practice, ores even with a sulfur content of less than 35% can constitute a sulfide dust explosion hazard, although mine dust with a sulfur content of less than 35% does not explode in laboratory conditions. To identify the cause of this phenomenon and develop technical solutions for ensuring safety of underground mining operations, change in the sulfur content of various mine dust fractions obtained from primary disintegration of sulfides was studied.
Macroeconomics of mining of the Far Eastern Federal District
Authors: Arkhipov Gennady
Published: September 2020

The analysis of macroeconomic indicators of the results of solid mineral extraction (TPI) in 11 subjects of the Far Eastern Federal district (DFO) was performed. The total value of production of all types of minerals (DPI) in terms of money at DFO is about 2.4 trillion rubles (45% of total gross regional product (GRP) of the region is equal to 5 trillion rubles.). More than 63% of the volume of DPI is achieved at the expense of fuel and energy resources of the Sakhalin region and the Republic of Sakha (Yakutia). In the dynamics of the region, there is a significant increase in GRP, production and value added for the DPI in general, and the production of fuel and energy minerals, but slower growth in the production of solid minerals. Ore (metal) raw materials of the region’s subjects in its total GRP is about 21%, in value terms-500 billion rubles. The region produces 16-18 types of ore mineral raw materials, including 12 types of raw materials as the main components of production, 4-5 types-as associated components. The main one is gold production (in 2019 more than 170 tons), silver (more than 930 tons). In the Far Eastern Federal district, reserves and resources of the main TPI for the long term have been identified. It is possible to significantly support the mining industry of the region in the case of exploration of new deposits with high-quality ores. Ore mineral raw materials of the leading geological and industrial types are currently insufficiently studied. It is necessary to develop intra-regional use and processing of raw materials to final products, create metallurgical industries, this will give new incentives to the development of the region’s resources. The analysis is of practical importance for evaluating and selecting directions in the deposits of subsurface use.
Numerical study on the fracture characteristics and failure mode of hard coal under coupled static and dynamic loads
Authors: Tan Lihai , Ren Ting , Yang Xiaohan , He Xueqiu
Published: September 2020

It has been well accepted by mining researchers that coal tends to undergo abrupt fracture under the coupling effect of dynamic and static loads. Hence, the study of influence of coupled static and dynamic loads on coal failure behaviour is meaningful for the understanding of coal burst. In this paper, PFC modelling of SHPB test is adopted to investigate the fracture mode and energy evolution of Australian hard coal under different combinations of pre-stress levels and impact velocities. Results have shown that high dynamic load will make the fracture mode and energy release of coal samples more violent even the static load is low. Although the strain energy increases with pre-stress level, the kinetic energy remains on a low level with the increase of pre-stress level when the impact velocity is 4 m/s.
Influence of the mining depth factor on accuracy of the forecast of the earth’s surface subsidence in Kuzbass
Authors: Kulibaba Sergey , Miletenko Natalia
Published: September 2020

Based on the results of the forecast of the earth’s surface deformations in the zone of influence of underground mining, measures are being developed to reduce the degree of negative man-made influence on undermined buildings, structures and natural objects. Changes in mining conditions affect the decrease in the accuracy of existing forecasting techniques. For example, under the conditions of Kuzbass, the actual earth’s surface subsidence can in a great measure (by 15-25%) exceed the predicted values. Research has shown that one of the factors affecting the source of error is the depth of mining. As a result of the research, a relationship is obtained between the value of the error in calculating the maximum earth’s surface subsidence and the average depth of mining, and a method for adjusting the calculation method is proposed.
Designing an improved geoacoustic event location algorithm in the “Prognoz-ADS” system
Authors: Konstantinov Alexander , Gladyr Andrey , Rasskazov Maxim
Published: September 2020

The article shows complex algorithm for locating geoacoustic events. Location algorithms problems are considered and methods for their solution are proposed. The requirement list is suggested for the developed algorithm, and the complex algorithm key stages are formulated.
Assessment of reserves and resources of technogenic complexes of gold-bearing deposits using remote sensing methods on the example of the Kerbinsky gold-bearing region (Khabarovsk Region)
Authors: Litvintsev Victor , Usikov Vitaly , Ozaryan Yulia , Alekseev Vladimir
Published: September 2020

Technogenic complexes of placer deposits, the development of which has been completed, are a significant reserve of the mineral resource base of gold and other precious metals. This paper presents the results of the creation of a method for expert assessment of spatial and volumetric indicators of technogenic complexes of alluvial deposits and other landscape objects using remote sensing of the territory and analysis of geological information. The Kerbinsky gold-bearing region of the Khabarovsk Region was chosen as the object of research.
Calibration method for seismic acoustic transducers for rock mass control
Authors: Krivosheyev Igor , Ignatieva Marina , Krivosheyeva Elena
Published: September 2020

A new method for calibrating seismoacoustic transducers is proposed, which is free from well-known drawbacks that affect the reliability of measurements. A functional diagram is proposed for calibrating seismoacoustic transducers with improved reliability using a fiber-optic interferometer and high sensitivity due to the possible choice of the type of interferometer.
High precision neutron inelastic cross sections on16O
Authors: Marian Boromiza , Catalin Borcea , Philippe Dessagne , Gregoire Henning , Mäelle Kervenoäelle , Alexandru Negret , Markus Nyman , Adina Olacel , Arjan Plompen
Published: September 2020

This work reports partial results of a (n, nγ) measurement on16O. Theγrays of interest from the inelastic channel were detected using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the Geel Electron Linear Accelerator (GELINA) neutron source. A very thick (32.30(4) mm) SiO2target was used. The main goal was to determine the angle-integrated γ-production cross section for the most important transitions. In this work we report the results for the main16O transition and we emphasize a consistency check aiming to ensure data reliability. Our results are compared with theoretical calculations performed using theTALYS1.8 code and with previously reported experimental data.
Study of photon strength functions of241Pu and245Cm from neutron capture measurements
Authors: Mendoza E. , Alcayne V. , Cano-Ott D , Kimura A. , Skarbeli A. V. , Aberle O. , Amaducci S. , Andrzejewski J. , Audouin L. , Babiano-Suarez V , Bacak M. , Barbagallo M. , Bécares V. , Bečvář F. , Bellia G. , Berthoumieux E. , Billowes J. , Bosnar D. , Brown A. S. , Busso M. , Caamaño M. , Caballero L. , Calviani M. , Calviño F. , Casanovas A. , Cerutti F. , Chen Y. H. , Chiaveri E. , Colonna N. , Cortés G. P. , Cortés-Giraldo M. A. , Cosentino L. , Cristallo S. , Damone L. A. , Diakaki M. , Dietz M. , Domingo-Pardo C , Dressler R. , Dupont E. , Durán I. , Eleme Z. , Fernández-Domíngez B. , Ferrari A. , Ferro-Gonçalves I. , Finocchiaro P. , Furman V. , Garg R. , Gawlik A. , Gilardoni S. , Glodariu T. , Göbel K. , González-Romero E. , Guerrero C. , Gunsing F. , Heinitz S. , Heyse J. , Jenkins D. G. , Jericha E. , Kadi Y. , Käppeler F. , Kivel N. , Kokkoris M. , Kopatch Y. , Krtička M. , Kurtulgil D. , Ladarescu I. , Lederer-Woods C , Lerendegui-Marco J , Meo S. Lo , Lonsdale S.-J. , Macina D. , Manna A. , Martínez T. , Masi A. , Massimi C. , Mastinu P. F. , Mastromarco M. , Matteucci F. , Maugeri E. , Mazzone A. , Mengoni A. , Michalopoulou V. , Milazzo P. M. , Mingrone F. , Musumarra A. , Negret A. , Nolte R. , Ogállar F. , Oprea A. , Patronis N. , Pavlik A. , Perkowski J. , Piersanti L. , Porras I. , Praena J. , Quesada J. M. , Radeck D. , Doval D. Ramos , Reifarth R. , Rochman D. , Rubbia C. , Sabaté-Gilarte M. , Saxena A. , Schillebeeckx P. , Schumann D. , Smith A. G. , Sosnin N. , Stamatopoulos A. , Tagliente G. , Tain J. L. , Talip Z. , Tarifeño-Saldivia A. E. , Tassan-Got L , Torres-Sánchez P. , Tsinganis A. , Ulrich J. , Urlass S. , Valenta S. , Vannini G. , Variale V. , Vaz P. , Ventura A. , Vlachoudis V. , Vlastou R. , Wallner A. , Woods P. J. , Wright T. J. , Žugec P.
Published: September 2020

We have measured theγ-rays following neutron capture on240Pu and244Cm at the n_TOF facility at CERN with the Total Absorption Calorimeter (TAC) and with C6D6 organic scintillators. The TAC is made of 40 BaF2 crystals operating in coincidence and covering almost the entire solid angle. This allows to obtain information concerning the energy spectra and the multiplicity of the measured captureγ-ray cascades. Additional information is also obtained from the C6D6 detectors. We have analyzed the measured data in order to draw conclusions about the Photon Strength Functions (PSFs) of241Pu and245Cm below their neutron separation energies. The analysis has been performed by fitting the PSFs to the experimental results, using the differential evolution method, in order to find neutron capture cascades capable of reproducing at the same time a great variety of deposited energy spectra.
Measurements of the 33S (n, α)30Si cross-section at n_TOF and ILL: Implications in neutron capture therapy
Authors: Praena Javier , L Isabelópez-Casas , Sabat Mariaé-Gilarte , Arias Fernando de Saavedra , Porras Ignacio
Published: September 2020

Up to a couple of years ago, the 33S(n, α)30Si cross-section data had been limited and scarce. The origin in the solar system of 36S had been the only motivation to study that cross-section. However, a few years ago, the 33S(n, α)30Si reaction was proposed as a possible target in neutron capture therapy (NCT) due to the excellent bio-properties of 33S and the significant resonance at 13.45 keV of the cross-section for which a high-energy α is emitted. Prior to the experiments carried out at n_TOF-CERN and at the Institut Laue-Langevin (ILL) facilities, the data situation was: no data from the thermal point up to 10 keV; from 10 keV to 300 keV, there was only one (n, α) measurement able to resolve the resonances with a questionable value of the 13.45-keV resonance; and the thermal point did not have a consistent value. Here we summarize three experiments that have been performed covering the whole energy range of interest in NCT and astrophysics. These experiments have solved the most important issues. The data of the present work and the evaluated data are used to calculate the dose rate in the tissue.
Double-differential cross section measurement with low threshold detector for proton production induced by several tens of MeV protons
Authors: Yamaguchi Yuji , Sanami Toshiya , Koba Yusuke , Uozumi Yusuke
Published: September 2020

We have developed a low threshold detector consisting of Bragg curve counter (BCC), two siliconsurface barrier detectors (SSDs) and BGO scintillator to obtain experimental double-differential cross section (DDX) data for low energy proton production. Since the BCC offers advantage of self particle identification capability and a few μm-thick entrance window, protons produced by nuclear reactions down to 1 MeV have been identified. The capability of the detector is demonstrated in measurements using 70-MeV protons. Measured spectra are compared with calculation results of intra-nuclear cascade (INC) plus evaporation models and nuclear data library.