bluuebunny/crossref_metadata_2025 huggingface dataset:
Trait variations and expression profiling of OsPHT1 gene family at the early growth-stages under phosphorus-limited conditions
Authors: Anandan Annamalai , Parameswaran Chidambaranathan , Mahender Anumalla , Nayak Amaresh Kumar , Vellaikumar Sampthamprajan , Balasubramaniasai Cayalvizhi , Ali Jauhar
Published: June 2021

To better understand the early response of genotypes to limited-phosphorus (P) conditions and the role of the phosphate transporter OsPHT1 gene family in the presence of PSTOL1, it is essential to characterize the level of tolerance in rice under limited-P conditions. In the present experiment, six rice genotypes were studied in three-way interactions [genotype (G) × phosphorus (P) × duration (D)] by comparing them at two instances (14 d and 28 d) under seven different concentrations of P (0.5‒10.0 ppm) in a hydroponic system. Trait differences and interactions of these traits were clearly distinguished among the various P rates. However, aboveground trait expression registered increased growth from 6.0 to 10.0 ppm of P. The major root-attributed traits in 0.5 ppm of P are significantly increased vis-à-vis 10 ppm of P. Analysis of variance displayed a significant difference between the genotypes for PSTOL1 and PHT1 expression. In low P, maximum root length with a shoot and root dry weight was observed in a new indigenous accession, IC459373, with higher expression of PSTOL1 than in Dular and IR64-Pup1 in 0.5 ppm of P at 14 d. Among the 13 PHT1 genes, OsPT1, OsPT2, OsPT6, and OsPT13 showed significant upregulation in IC459373, Dular, and IR64-Pup1. These results indicated that studying the expression levels of the PSTOL1 and PHT1 gene family at the early growth stages would be helpful in identifying superior donors to improve low-P tolerance and P-use efficiency in rice breeding programs.
The structure-based cancer-related single amino acid variation prediction
Authors: Liu Jia-Jun , Yu Chin-Sheng , Wu Hsiao-Wei , Chang Yu-Jen , Lin Chih-Peng , Lu Chih-Hao
Published: June 2021

Single amino acid variation (SAV) is an amino acid substitution of the protein sequence that can potentially influence the entire protein structure or function, as well as its binding affinity. Protein destabilization is related to diseases, including several cancers, although using traditional experiments to clarify the relationship between SAVs and cancer uses much time and resources. Some SAV prediction methods use computational approaches, with most predicting SAV-induced changes in protein stability. In this investigation, all SAV characteristics generated from protein sequences, structures and the microenvironment were converted into feature vectors and fed into an integrated predicting system using a support vector machine and genetic algorithm. Critical features were used to estimate the relationship between their properties and cancers caused by SAVs. We describe how we developed a prediction system based on protein sequences and structure that is capable of distinguishing if the SAV is related to cancer or not. The five-fold cross-validation performance of our system is 89.73% for the accuracy, 0.74 for the Matthews correlation coefficient, and 0.81 for the F1 score. We have built an online prediction server, CanSavPre (http://bioinfo.cmu.edu.tw/CanSavPre/), which is expected to become a useful, practical tool for cancer research and precision medicine.
Functional response of Harmonia axyridis preying on Acyrthosiphon pisum nymphs: the effect of temperature
Authors: Islam Yasir , Shah Farhan Mahmood , Rubing Xu , Razaq Muhammad , Yabo Miao , Xihong Li , Zhou Xingmiao
Published: June 2021

In the current study, we investigated the functional response ofHarmonia axyridisadults and larvae foraging onAcyrthosiphon pisumnymphs at temperatures between 15 and 35 °C. Logistic regression and Roger’s random predator models were employed to determine the type and parameters of the functional response.Harmonia axyridislarvae and adults exhibited Type II functional responses toA. pisum, and warming increased both the predation activity and host aphid control mortality. Female and 4th instarH. axyridisconsumed the most aphids. For fourth instar larvae and femaleH. axyridisadults, the successful attack rates were 0.23 ± 0.014 h−1and 0.25 ± 0.015 h−1; the handling times were 0.13 ± 0.005 h and 0.16 ± 0.004 h; and the estimated maximum predation rates were 181.28 ± 14.54 and 153.85 ± 4.06, respectively. These findings accentuate the high performance of 4th instar and femaleH. axyridisand the role of temperature in their efficiency. Further, we discussed such temperature-driven shifts in predation and prey mortality concerning prey-predator foraging interactions towards biological control.
Estimating the yield stability of heat-tolerant rice genotypes under various heat conditions across reproductive stages: a 5-year case study
Authors: Wu Chao , Cui Kehui , Li Qian , Li Liuyong , Wang Wencheng , Hu Qiuqian , Ding Yanfeng , Li Ganghua , Fahad Shah , Huang Jianliang , Nie Lixiao , Peng Shaobing
Published: June 2021

Heat events during the reproductive stages of rice plants induce great yield losses. Cultivating heat-tolerant varieties is a promising strategy for guaranteeing grain security under global warming scenarios. Most heat-tolerant rice genotypes were identified under heat during the flowering stage, but it is unclear whether these currently screened heat-tolerant rice genotypes maintain stable high grain yields when heat stress occurs during the other reproductive stages. In the present study, two notable heat-tolerant rice cultivars, Nagina22 and Shanyou63, and one typical heat-sensitive cultivar, Liangyoupeijiu, were evaluated for their yield response and yield stability under heat treatments during the panicle initiation, flowering, and grain filling stages during 2010–2014. Our results revealed that rice cultivars respond differently to heat stress during different reproductive stages. Nagina22 was the most tolerant to heat stress during the flowering and grain filling stages but was susceptible during panicle initiation; Shanyou63 was the most tolerant to heat stress during panicle initiation and grain filling and was moderately tolerant to heat stress during the flowering stages. Genotype and genotype-by-environment interaction biplot yield analysis revealed that Shanyou63 exhibited the highest stability in high grain yield, followed by Nagina22, and Liangyoupeijiu exhibited stable low grain yield when experiencing heat stress across the three reproductive stages. Our results indicate that the heat tolerance of different rice cultivars depends on the reproductive stage during which heat stress occurs, and the effects manifest as reductions in grain yields and seed setting rates. Future efforts to develop heat-tolerant varieties should strive to breed varieties that are comprehensively tolerant to heat stress during any reproductive stage to cope with the unpredictable occurrence of future heat events.
Anisotropic and age-dependent elastic material behavior of the human costal cartilage
Authors: Weber Matthias , Rothschild Markus Alexander , Niehoff Anja
Published: June 2021

Compared to articular cartilage, the biomechanical properties of costal cartilage have not yet been extensively explored. The research presented addresses this problem by studying for the first time the anisotropic elastic behavior of human costal cartilage. Samples were taken from 12 male and female cadavers and unconfined compression and indentation tests were performed in mediolateral and dorsoventral direction to determine Young’s Moduli EC for compression and Ei5%, Ei10% and Eimax at 5%, 10% and maximum strain for indentation. Furthermore, the crack direction of the unconfined compression samples was determined and histological samples of the cartilage tissue were examined with the picrosirius-polarization staining method. The tests revealed mean Young’s Moduli of EC = 32.9 ± 17.9 MPa (N = 10), Ei5% = 11.1 ± 5.6 MPa (N = 12), Ei10% = 13.3 ± 6.3 MPa (N = 12) and Eimax = 14.6 ± 6.6 MPa (N = 12). We found that the Young’s Moduli in the indentation test are clearly anisotropic with significant higher results in the mediolateral direction (all P = 0.002). In addition, a dependence of the crack direction of the compressed specimens on the load orientation was observed. Those findings were supported by the orientation of the structure of the collagen fibers determined in the histological examination. Also, a significant age-related elastic behavior of human costal cartilage could be shown with the unconfined compression test (P = 0.009) and the indentation test (P = 0.004), but no sex effect could be detected. Those results are helpful in the field of autologous grafts for rhinoplastic surgery and for the refinement of material parameters in Finite Element models e.g., for accident analyses with traumatic impact on the thorax.
Author Correction: Atmospheric CO2 during the Mid-Piacenzian Warm Period and the M2 glaciation
Authors: de la Vega Elwyn , Chalk Thomas B. , Wilson Paul A. , Bysani Ratna Priya , Foster Gavin L.
Published: June 2021

The original version of this Article contained errors.
Age-dependent shift in the de novo proteome accompanies pathogenesis in an Alzheimer’s disease mouse model
Authors: Elder Megan K. , Erdjument-Bromage Hediye , Oliveira Mauricio M. , Mamcarz Maggie , Neubert Thomas A. , Klann Eric
Published: June 2021

Alzheimer’s disease (AD) is an age-related neurodegenerative disorder associated with memory loss, but the AD-associated neuropathological changes begin years before memory impairments. Investigation of the early molecular abnormalities in AD might offer innovative opportunities to target memory impairment prior to onset. Decreased protein synthesis plays a fundamental role in AD, yet the consequences of this dysregulation for cellular function remain unknown. We hypothesize that alterations in the de novo proteome drive early metabolic alterations in the hippocampus that persist throughout AD progression. Using a combinatorial amino acid tagging approach to selectively label and enrich newly synthesized proteins, we found that the de novo proteome is disturbed in young APP/PS1 mice prior to symptom onset, affecting the synthesis of multiple components of the synaptic, lysosomal, and mitochondrial pathways. Furthermore, the synthesis of large clusters of ribosomal subunits were affected throughout development. Our data suggest that large-scale changes in protein synthesis could underlie cellular dysfunction in AD.
The autumnal lockdown was not the main initiator of the decrease in SARS-CoV-2 circulation in France
Authors: Pereda-Loth Veronica , Pineda Aldair Martínez , Tisseyre Lenka , Courtade-Saidi Monique , Bousquet Christophe , Ferdenzi Camille , Letellier Thierry , Bensafi Moustafa , Pierron Denis
Published: June 2021

Background

In response to the SARS-CoV-2 pandemic, governments have taken drastically restrictive public health measures with significant collateral effects. It is important to understand the impact of these measures on SARS-CoV-2 circulation. However, pandemic indicators lag behind the actual level of viral circulation and these delays are an obstacle to assessing the effectiveness of policy decisions. Here, we propose one way to solve this problem by synchronizing the indicators with viral circulation in a country (France) based on a landmark event.

Methods

Based on a first lockdown, we measured the time lag between the peak of governmental and non-governmental surveillance indicators and the highest level of virus circulation. This allowed alignment of all surveillance indicators with viral circulation during the second period of the epidemic, overlaid with the type of public health measures implemented.

Results

We show that the second peak in viral circulation in France happened ~21 October 2020, during the public health state of emergency but before the lockdown (31 October). Indicators also suggest that viral circulation decreased earlier in locations where curfews were implemented. Indicators did, however, begin to rise once the autumnal lockdown was lifted and the state of emergency resumed.

Conclusions

Overall, these results suggest that in France, the 2020 autumnal lockdown was not the main initiator of the decrease in SARS-CoV-2 circulation and curfews were important in achieving control of the transmission. Less-restrictive measures may need to be balanced with more-stringent measures to achieve desirable public health outcomes over time.
Predicting prostate cancer specific-mortality with artificial intelligence-based Gleason grading
Authors: Wulczyn Ellery , Nagpal Kunal , Symonds Matthew , Moran Melissa , Plass Markus , Reihs Robert , Nader Farah , Tan Fraser , Cai Yuannan , Brown Trissia , Flament-Auvigne Isabelle , Amin Mahul B. , Stumpe Martin C. , Müller Heimo , Regitnig Peter , Holzinger Andreas , Corrado Greg S. , Peng Lily H. , Chen Po-Hsuan Cameron , Steiner David F. , Zatloukal Kurt , Liu Yun , Mermel Craig H.
Published: June 2021

Background

Gleason grading of prostate cancer is an important prognostic factor, but suffers from poor reproducibility, particularly among non-subspecialist pathologists. Although artificial intelligence (A.I.) tools have demonstrated Gleason grading on-par with expert pathologists, it remains an open question whether and to what extent A.I. grading translates to better prognostication.

Methods

In this study, we developed a system to predict prostate cancer-specific mortality via A.I.-based Gleason grading and subsequently evaluated its ability to risk-stratify patients on an independent retrospective cohort of 2807 prostatectomy cases from a single European center with 5–25 years of follow-up (median: 13, interquartile range 9–17).

Results

Here, we show that the A.I.’s risk scores produced a C-index of 0.84 (95% CI 0.80–0.87) for prostate cancer-specific mortality. Upon discretizing these risk scores into risk groups analogous to pathologist Grade Groups (GG), the A.I. has a C-index of 0.82 (95% CI 0.78–0.85). On the subset of cases with a GG provided in the original pathology report (n = 1517), the A.I.’s C-indices are 0.87 and 0.85 for continuous and discrete grading, respectively, compared to 0.79 (95% CI 0.71–0.86) for GG obtained from the reports. These represent improvements of 0.08 (95% CI 0.01–0.15) and 0.07 (95% CI 0.00–0.14), respectively.

Conclusions

Our results suggest that A.I.-based Gleason grading can lead to effective risk stratification, and warrants further evaluation for improving disease management.
Rapid quantitative analysis of trace elements in plutonium alloys using a handheld laser-induced breakdown spectroscopy (LIBS) device coupled with chemometrics and machine learning
Authors: Rao Ashwin P. , Jenkins Phillip R. , Vu Dung M. , Auxier II John D. , Patnaik Anil K. , Shattan Michael B.
Published: June 2021

We present the first reported quantification of trace elements in plutonium via a portable laser-induced breakdown spectroscopy (LIBS) device and demonstrate the use of chemometric analysis to enhance the handheld device's sensitivity and precision.
External stimuli-responsive nanoparticles for spatially and temporally controlled delivery of CRISPR–Cas genome editors
Authors: Xie Ruosen , Wang Yuyuan , Gong Shaoqin
Published: June 2021

In this review, we summarize the state-of-the-art non-viral vectors that exploit external stimuli (i.e., light, magnetic field, and ultrasound) for spatially and temporally controlled genome editing and their in vitro and in vivo applications.
Atomic-level localization of π-electrons in defect engineered tri-s-triazine units for increased photocatalytic hydrogen generation of polymeric carbon nitride
Authors: Xue Mengqi , Jiang Daochuan , Du Haiwei , Li Zhongjun , Bi Hong , Yuan Yupeng
Published: June 2021

N defects in tri-s-triazine units can localize π electrons to reduce charge recombination and act as active sites, thus improving the efficiency of photocatalytic hydrogen production.
Elucidating the effects of individual components in KxMnOy/SiO2and water on selectivity enhancement in the oxidative coupling of methane
Authors: Aydin Zeynep , Zanina Anna , Kondratenko Vita A. , Eckelt Reinhard , Bartling Stephan , Lund Henrik , Rockstroh Nils , Kreyenschulte Carsten R. , Linke David , Kondratenko Evgenii V.
Published: June 2021

To date, a great number of various materials have been tested for the oxidative coupling of methane (OCM).
A new material discovery platform of stable layered oxide cathodes for K-ion batteries
Authors: Park Sohyun , Park Sunhyeon , Park Young , Alfaruqi Muhammad Hilmy , Hwang Jang-Yeon , Kim Jaekook
Published: June 2021

A new materials discovery platform based on combined machine learning (ML) and density functional theory (DFT) for screening and experimental validation is proposed for designing a stable KxMnO2 cathode in K-ion batteries.
Enhanced ozonation of pollutants by MgO nanoclusters/sewage sludge-derived hierarchical porous carbon: experimental and theoretical study
Authors: Li Siyang , Zhan Shujuan , Sun Jingxiang , Yao Lingai , Zhu Jinzhu , Feng Jinxi , Xiong Ya , Tian Shuanghong
Published: June 2021

MgO nanoclusters stabilized by modified sewage sludge-derived hierarchical porous carbon were prepared and used as an efficient catalyst in catalytic ozonation of refractory pollutants.
Silver quasi-nanoparticles: bridging the gap between molecule-like clusters and plasmonic nanoparticles
Authors: Douma Fatima , Lakiss Louwanda , Lebedev Oleg I. , Cardin Julien , Kostov Krassimir L. , El Fallah Jaafar , Valtchev Valentin , El-Roz Mohamad
Published: June 2021

Herein, we report a new strategy for preparing connected silver sub-nanoparticles with unique optical behavior via the selective photo-assisted electrochemical reduction of silver cations in FAU-type zeolite X (FAUX) cages.
Visualizing the {110} surface structure of equilibrium-form ZIF-8 crystals by low-dose Cs-corrected TEM
Authors: Han Xiaocang , Chen Wenqian , Su Rui , Tian Yuan , Liu Pan , Guan Pengfei , Luo Min , Han Jiuhui , Cao Xiaoxiao , Pan Ming , Chen Mingwei
Published: June 2021

The zigzag-type {110} surface termination of ZIF-8 rhombic dodecahedral crystals synthesized in methanol was demonstrated by low-dose Cs-corrected HRTEM and solvent corrected surface energy calculations.
A novel high efficiency and ultra-stable red emitting europium doped pyrophosphate phosphor for multifunctional applications
Authors: Wang Chuang , Li Ying , Chen Shuanglong , Li Yanyan , Lv Qingyi , Shao Bohuai , Zhu Ge , Zhao Lei
Published: June 2021

The RBPO:Eu3+ phosphor developed by the nonlinear optical material-inspired methodology can serve as a potential candidate in solid state lighting applications, artistic appreciation or some applications under extreme conditions.
Triple-responsive targeted hybrid liposomes with high MRI performance for tumor diagnosis and therapy
Authors: Yao Weihe , Liu Chenyu , Wang Ning , Zhou Hengjun , Chen Hailiang , Qiao Weihong
Published: June 2021

Targeted multi-responsive drug delivery systems with magnetic resonance imaging (MRI) capacity were anticipated as a promising tool for tumor therapy and diagnosis.
Synthesis, oligomerization and catalytic studies of a redox-active Ni4-cubane: a detailed mechanistic investigation
Authors: Kushvaha Saroj Kumar , Francis Maria , Kumar Jayasree , Nag Ekta , Ravichandran Prathap , Roy Sudipta , Chandra Mondal Kartik
Published: June 2021

A robust tetrameric nickel complex [Ni4((Oal−)2L-Me)4(s)4] (s = solvent) with cubane-like Ni4O4 core topology identified as the efficient catalyst for the diastereoselective cyclopropanation of aromatic heterocycles.
Photocatalytic deoxygenation of N–O bonds with rhenium complexes: from the reduction of nitrous oxide to pyridine N-oxides
Authors: Kjellberg Marianne , Ohleier Alexia , Thuéry Pierre , Nicolas Emmanuel , Anthore-Dalion Lucile , Cantat Thibault
Published: June 2021

A rhenium-based photocatalyst enables the deoxygenation of several compounds containing N–O bonds, such as N2O and pyridine N-oxides.
An integrated mass spectrometry imaging and digital pathology workflow for objective detection of colorectal tumours by unique atomic signatures
Authors: Paul Bence , Kysenius Kai , Hilton James B. , Jones Michael W. M. , Hutchinson Robert W. , Buchanan Daniel D. , Rosty Christophe , Fryer Fred , Bush Ashley I. , Hergt Janet M. , Woodhead Jon D. , Bishop David P. , Doble Philip A. , Hill Michelle M. , Crouch Peter J. , Hare Dominic J.
Published: June 2021

Digital pathology and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) imaging reveals a unique elemental signature of colorectal cancer.
Total synthesis of (+)-spiroindimicin A and congeners unveils their antiparasitic activity
Authors: Zhang Zhen , Ray Sneha , Imlay Leah , Callaghan Lauren T. , Niederstrasser Hanspeter , Mallipeddi Prema Latha , Posner Bruce A. , Wetzel Dawn M. , Phillips Margaret A. , Smith Myles W.
Published: June 2021

Spiroindimicins A and H have been synthesized for the first time via a key palladium-catalyzed spirocyclization. Access to these alkaloids and several congeners has allowed the discovery of their antiparasitic properties.
On 1,3-phosphaazaallenes and their diverse reactivity
Authors: Fischer Malte , Hering-Junghans Christian
Published: June 2021

The combination of phospha-Wittig reagents with isonitriles affords 1,3-phosphaazaallenes and their diverse reactivity has been studied in detail.
Tin oxide for optoelectronic, photovoltaic and energy storage devices: a review
Authors: Dalapati Goutam Kumar , Sharma Himani , Guchhait Asim , Chakrabarty Nilanjan , Bamola Priyanka , Liu Qian , Saianand Gopalan , Sai Krishna Ambati Mounika , Mukhopadhyay Sabyasachi , Dey Avishek , Wong Terence Kin Shun , Zhuk Siarhei , Ghosh Siddhartha , Chakrabortty Sabyasachi , Mahata Chandreswar , Biring Sajal , Kumar Avishek , Ribeiro Camila Silva , Ramakrishna Seeram , Chakraborty Amit K. , Krishnamurthy Satheesh , Sonar Prashant , Sharma Mohit
Published: June 2021

Tin dioxide (SnO2) used in various applications due to suitable band gap and tunable conductivity. It has excellent thermal, mechanical and chemical stability.
Multiscale pore contained carbon nanofiber-based field-effect transistor biosensors for nesfatin-1 detection
Authors: Kim Sung Gun , Lee Jun Seop
Published: June 2021

Antibody-functionalized, multiscale pore contained carbon nanofiber-based FET-type sensor exhibits ultrahigh sensitive and selectivity toward the epilepsy biomarker (NES1).
Reduced graphene oxide in perovskite solar cells: the influence on film formation, photophysics, performance, and stability
Authors: Marchezi Paulo Ernesto , de Araújo Francineide Lopes , Szostack Rodrigo , Germino José Carlos , Therézio Eralci M. , Marletta Alexandre , Nogueira Ana Flavia
Published: June 2021

In situGIWAXS experiments reveal that the presence of RGO decreases the formation rate of the perovskite, increases the grain size, and improves the stability of solar cells.
Ultrathin oxysulfide semiconductors from liquid metal: a wet chemical approach
Authors: Nguyen Chung Kim , Low Mei Xian , Zavabeti Ali , Jannat Azmira , Murdoch Billy J. , Della Gaspera Enrico , Orrell-Trigg Rebecca , Walia Sumeet , Elbourne Aaron , Truong Vi Khanh , McConville Chris F. , Syed Nitu , Daeneke Torben
Published: June 2021

Liquid metal chemistry offers a new pathway towards the creation of functional 2D metal oxysulfides.
The Additional Effect of Vestibular Rehabilitation Therapy on Residual Dizziness After Successful Modified Epley Procedure for Posterior Canal Benign Paroxysmal Positional Vertigo
Authors: Heydari Maryam , Ahadi Mohsen , Jalaei Bahram , Maarefvand Mohammad , Talebi Hossein
Published: June 2021

Purpose

The aim of the study was to evaluate the additional effect of vestibular rehabilitation therapy (VRT) compared with the modified Epley procedure alone on residual dizziness after a successful modified Epley procedure in patients with posterior canal benign paroxysmal positional vertigo (BPPV).

Method

In this cross-sectional analytical comparative study, 47 patients (35 women and 12 men) aged 18–80 years with posterior canal BPPV were randomly assigned to one of two following groups: the control group, who received the modified Epley procedure only, and the VRT group, who received the modified Epley procedure plus vestibular rehabilitation for 4 weeks. Outcome measures, including the Dizziness Handicap Inventory (DHI), the Vertigo Symptom Scale–Long Version (VSS-L), and the Vertigo Symptom Scale–Short Form (VSS-SF), were conducted on the same session before initial therapy (T1), at 48 hr later (T2), and at 4 weeks later (T3). Presence or absence of residual dizziness was evaluated at T2.

Results

Residual dizziness was found in 20 (42.6%) patients after a successful modified Epley procedure. There was no statistically significant difference between the mean DHI, VSS-L, and VSS-SF scores at T1, T2, and T3 in patients who manifested with residual dizziness and those without residual dizziness in both groups. The average DHI, VSS-L, and VSS-SF score reduced during the time in both groups. These results were demonstrated that the VRT group and the control group have similar reductions in symptoms after treatment with the VRT plus modified Epley procedure and the modified Epley procedure only, respectively.

Conclusions

Residual dizziness is a common condition after a successful modified Epley procedure for BPPV. The VRT plus modified Epley procedure is as effective as modified Epley procedure alone in the management of residual dizziness. Further studies with supervised and customized VRT and longer follow-up periods are needed.

Supplemental Material

https://doi.org/10.23641/asha.14825508
Astrometric radial velocities for nearby stars
Authors: Lindegren Lennart , Dravins Dainis
Published: June 2021

Context. Under certain conditions, stellar radial velocities can be determined from astrometry, without any use of spectroscopy. This enables us to identify phenomena, other than the Doppler effect, that are displacing spectral lines.

Aims. The change of stellar proper motions over time (perspective acceleration) is used to determine radial velocities from accurate astrometric data, which are now available from the Gaia and HIPPARCOS missions.

Methods. Positions and proper motions at the epoch of HIPPARCOS are compared with values propagated back from the epoch of the Gaia Early Data Release 3. This propagation depends on the radial velocity, which obtains its value from an optimal fit assuming uniform space motion relative to the solar system barycentre.

Results. For 930 nearby stars we obtain astrometric radial velocities with formal uncertainties better than 100 km s−1; for 55 stars the uncertainty is below 10 km s−1, and for seven it is below 1 km s−1. Most stars that are not components of double or multiple systems show good agreement with available spectroscopic radial velocities.

Conclusions. Astrometry offers geometric methods to determine stellar radial velocity, irrespective of complexities in stellar spectra. This enables us to segregate wavelength displacements caused by the radial motion of the stellar centre-of-mass from those induced by other effects, such as gravitational redshifts in white dwarfs.
Principles for certain geomechanics problems solution during overworking of mine workings
Authors: Bondarenko Volodymyr , Kovalevska Iryna , Symanovych Hennadii , Barabash Mykhailo , Salieiev Ildar
Published: June 2021

This paper deals with two relevant and interrelated directions of coal mining development. Firstly, the resource-saving complete extraction of reserves, and secondly, the intensification of mining activity through mining operations conducted on several seams. The objective of overworking of mine workings with a real representation of mining-and-geological and mining-engineering conditions has been formulated. Five peculiarities of the geomechanical models construction for overworking of mine works have been revealed and substantiated. The technology for performing a series of computational experiments is proposed. The task of the protecting pillar influence, which is located in overlying coal seam, on the state of mine working placed in the underlying coal seam has been solved. An optimal scheme for its maintenance is proposed.
Ensuring sustainable development of enterprises in the conditions of digital transformations
Authors: Demianchuk Maryna , Koval Viktor , Hordopolov Volodymyr , Kozlovtseva Valentyna , Atstaja Dzintra
Published: June 2021

Modern enterprises are dynamically developing due to the fourth industrial revolution, contributing to the introduction of innovative infocommunication technologies in most business processes, thereby shaping and developing the digital economy. The aim of the article is to substantiate the concept of sustainable development of enterprises in the context of digital transformations. The theoretical and methodological foundations of sustainable development at different levels of the hierarchy have been determined. The concept of sustainable development of enterprises has been developed, the implementation of which is aimed at harmonizing the economic, environmental and social activities of the enterprise. The stages of the process of implementing the concept of sustainable development of enterprises are highlighted, providing for the justification of an inert, neutral, progressive or forced vector. Ensuring the implementation of the concept of sustainable development is expected through the use of applied models, in particular, the implementation of a parametric model of joint deployment of enterprise infrastructure with other infrastructure facilities in economic activity, taking into account technical, geographical, organizational and socio-economic factors to strengthen financial stability; building a model for ensuring a balanced balance between economic efficiency and environmental and social responsibility of an enterprise using a mechanism for managing transformation processes in the process of transition to sustainable development in the context of digitalization.
Global benchmarking for monitoring environmental, economic, and social performance for metallurgical production enterprises
Authors: Lavrenenko Valentyna , Yanhol Hanna , Tishkov Bohdan
Published: June 2021

The development of the ideology of sustainable development stimulated the emergence of companies’ Performance Management Systems with an emphasis on the environmental aspects of their activities. Benchmarking, as a modern management tool, is often used for competitive analysis and setting development goals. This study’s scientific problem is to assess the feasibility of applying benchmarking studies to assess the global industry’s environmental aspects. The purpose of the study is to identify the prerequisites for using benchmarking to improve environmental performance, as well as to identify best practices among world-leading companies. For benchmarking, a logical information model is proposed in the study. On its basis, eight world leaders were selected, trends in the industry’s development were analysed, and reference values of environmental indicators were established. For environmental performance assessment, it is proposed to use such indicators as greenhouse gas emissions, energy consumption, material efficiency, environmental management systems. Comparative benchmarking analysis of world leaders and 16 largest Ukrainian companies allowed determining the reserves for increasing environmental performance. The directions for increasing environmental performance are Investment in resource-saving technologies, production of higher value-added products, investments in energy-saving and new technologies, improvement of management systems, and certification. These ideas are complemented by recommendations for improving environmental performance, based on the Circular Economy Concept’s philosophy and Industry 4.0. The study’s practical significance is that Ukrainian companies can use their results to achieve higher environmental and economic outcomes.
Catastrophes, fractals and chaos in geoengineering and water treatment systems
Authors: Yeremeyev Igor , Dychko Alina , Kyselov Volodymyr , Remez Natalya , Khlobystov Ievgen
Published: June 2021

The present paper provides the assessing scale of the actual state of the geoengineering complexes and the model for predicting the behavior of supporting structures. To predict accidents in geoengineering and water treatment facilities it is proposed to apply the results of the theory of catastrophe theory, fuzzy sets, chaos theory and the theory of possibilities for the selection of optimal models of system behavior for a particular situation. It is shown that determination the limit boundaries in which the operation of the system can exist is impossible without the consideration of geoengineering treatment facilities and their components as fractal structures, functioning under conditions of “chaos”. To minimize risks of damages of sewage geoengineering systems the monitoring with measurement of the toxic gases concentration and comparing it with the obtained one should be provided. The use of models of internal and external corrosion which includes the elements of the theory of fuzzy sets helps to evaluate completely the state of water supply and treatment facilities network.
Computational aerodynamics in architectural siting of the structures of agro-industrial complex
Authors: Makhinko Anton , Makhinko Nataliia
Published: June 2021

The article presents study of wind effect on silo parks, which was carried out by computer simulation methods. A special modeling technique was created as a software module for the Ansys Workbench platform. A finite element mesh was developed in accordance with two requirements. Through the use of this mesh, which doesn’t contain needless elements which can be used for simplification of calculations and reduction of execution time, it is possible to describe the turbulent airflow in sufficient detail. The dimensions of all mesh elements are determined by special relations as the functions of the silo diameter and the Reynolds number. The major stage in this investigation was modeling of various options for flowing silos and their groups. As a result of the study, we have obtained aerodynamic characteristics of individual silos as part of silo parks and plotted charts of the distribution of pressure coefficients over the cylinder surface, changing the size of the silos, distances between them and local wind regime. Based on these data, we have drawn a conclusion about the optimal space planning locations of silos for different wind directions. Visualizations of turbulent flow around models at different speeds have also been obtained in this study.
Methods for developing an indoor navigation system
Authors: Deliyska Dimitrina , Yanev Nikolay , Trifonova Mariana
Published: June 2021

The report offers methods for developing an indoor navigation system. For this purpose, popular navigation applications have been analysed. We have been strongly motivated by the fact that no universal methods have been established that are applicable with this kind of projects. Very often the case is that new methods are formed in view of a specific process and they are based on a particular technology and on the related organisation, design and other considerations. This is also confirmed by a conducted experiment with a commercial product for indoor navigation. The methods offered include map digitising, determining a user’s location, and selecting the shortest path. This is achieved by applying elements of graph theory, databases, XML and QR code. The methods offered are universal and could be applied to any type of building. The methods have been approbated in the building of a mobile application for the needs of the University of Mining and Geology, Sofia.
Modern development trend of normative monetary valuation of non-agricultural land plots in Ukraine
Authors: Anopriienko Tetiana , Pilicheva Maryna , Sauchanka Volha
Published: June 2021

The article identifies the main types of land valuation – expert monetary valuation for individual evaluation of particular plots and normative monetary valuation for systematic valuation of land for tax purposes. To conduct the last one, a mass assessment of land plots considering geoinformation technologies is used. It is established that at the present stage of normative monetary valuation of non-agricultural land plots in Ukraine two methodologies are used: within the settlement and outside it. The project of the unified methodology of normative monetary valuation of land plots by combining the existing methods submitted for discussion by the Ministry of Economy, Trade and Agriculture of Ukraine is considered. The values of land plots according to the existing and unified methodologies are studied on the example of four land plots under gas stations, which are located in the city of Kharkiv and outside it. It is established that the values of land plots, determined by existing and unified methods, differ both in the direction of increase and decrease, the difference varies from 9 % to 97 %. It is necessary to conduct additional analysis of initial data and indicators, which are the basis for calculating and improve the offer unified methodology.
The problems of forming a system of green areas as an ecological framework of a large city (on the example of Kyiv)
Authors: Pleshkanovska Alla
Published: June 2021

Each large city is characterized by its own unique model of spatial organization of green areas, which form the ecological framework of the city and act as a condition for its balanced ecological development. The article presents results of an analysis of the actual state and preconditions for the formation of a system of green areas of public use of a large city on the example of the city of Kyiv. The model of the ecological framework of Kyiv, in comparison with the models of other European cities, is characterized. The specificity of the spatial organization of the landscaping system is marked by the presence of a powerful water-green diameter in the central part of the city, formed by the valley of the Dnipro River with islands, and a developed peripheral-ring forest park belt. The central and middle densely developed area of the city suffers from a significant lack of green areas for public use. The article formulates urban planning problems completion of the formation of an integrated ecological network of Kyiv, and outlined areas for improving the city's landscaping system.
Development of software control tools for power systems of mining and metallurgical regions
Authors: Morkun Vladimir , Kotov Igor
Published: June 2021

There are presented results of developing a conceptual trigger chart of the functioning mechanism of the decision support system. The suggested model of visualizing algorithms as a trigger net of states of the computer decision support system provides for interaction of power objects of mining and metallurgical complexes and regions. The authors introduce new interpretation of components of the network trigger model. The model is interactively connected with both the user-operator’s actions and states of power system components. With that, the state of the automatic model is associated with realizing a set of metarules to control the logic output. The authors elaborate a new formalism of representing algorithms of controlling knowledgebases interacting with the outer environment which aggregates primitives of conditions, triggers and transactions of operations and greatly generalizes standard languages of algorithm visualization. It enhances elaboration of standardized smart systems interacting with the external environment. This allows description of functioning algorithms of knowledgebases and the event-driven output to ensure development of reliable standardized smart systems interacting with control objects of power systems in mining and metallurgical regions.
Model investigations into assessing optimal power consumption modes for major pump stations of iron ore underground mines
Authors: Sinchuk Igor , Beridze Tetyana , Kasatkina Irina , Krasnopolsky Roman , Dozorenko Oleg , Strzelecki Ryszard
Published: June 2021

The article investigates into the level of energy efficiency of main water pump stations of iron ore underground mines in case of time-of-day electricity rate. There are developed and suggested methods of analyzing the influence of pump electric capacity on electricity cost based on multifactor regressive models. The data on power consumption of iron ore mines indicates a complex character of analyzing the results obtained. However, application of information technologies enables using static materials in a new way including indices of power consumption, costs, water intake, mining depth, the number of pumps and their capacity by synthesizing mathematical models as complicated objects through in-depth procession of static materials and substantiation of the obtained results. For the first time, there are used multifactor regressive models considering multicollinearity and non-linearity of pump capacity in order to study its influence on power costs by using the elasticity factor. Analysis of mathematical simulation results relevant to static materials and applying the algorithm of studying dependency of the consumed power costs on pumps’ capacity reveals some critical values resulting in corresponding effects. The authors recommend to apply the elaborated algorithm to conducting corresponding calculations by for mining enterprises to monitor formation of the strategy of providing energy efficiency under time-of-day electricity rates.
Economic feasibility of wind and photovoltaic energy in Kuwait
Authors: Al-Nassar Waleed K. , Neelamani S. , William Teena Sara
Published: June 2021

The worldwide environmental concern and awareness created a way towards the generation of pollution-free wind and solar renewable energies. Wind and Photovoltaic (PV) power plants of each 10 MW capacity located in the Shagaya area, west of Kuwait, were compared after one year of operation. The wind power plants recorded high capacity factors resulting in a yearly power production of 42.59 GWh, 21% higher than expected (contractual 31.160 GWh). It will reduce the emission of CO2 throughout the projected lifetime of 25 years by 118,303 tons. CAPEX (capital Expenditure) and OPEX (operation expenditure) were taken into consideration throughout the life of the plants along with investment costs resulting in a levelized cost of electricity (LCOE) for wind of 0.015 KWD/kWh or 0.046 USD/kWh, compared to 0.027 KWD/kWh or 0.082 USD/kWh for solar PV (44% lower than PV). Offshore, Boubyan Island, Northern Kuwait territorial waters, were found to be the foremost appropriate for wind energy generation, with Wind Power Density of more than 500 Watt/m2 in summer which is ideal for the high energy demanding season in Kuwait. The LCOE for offshore wind energy was 27.6 fils/kWh, compared to 39.3 fils/kWh for thermal power plants.
Models of the optimal distribution of fertilizers and vehicles in grain production
Authors: Saparbayev Abdizhapar , Makulova Aiymzhan , Eleusov Azamat , Meirmanova Ulzhan , Klyshbayeva Zaure
Published: June 2021

The paper considers models of optimal distribution of fertilizers and vehicles in grain production. To ensure the delivery of fertilizer to the destination for the chemical treatment agriculture, the optimal distribution of fertilizers in grain production was solved. On the basis of optimal models, the needs of vehicles for servicing these works are determined. As calculations show, the cost of acquiring machines and operating costs can be reduced by 20-30% due to the correct selection and use of equipment. This made it possible to distribute mineral fertilizers between farms in accordance with the characteristics of their soils. With the help of ground equipment, mineral fertilizers are applied, chemical pest and plant disease control is carried out, weed vegetation is destroyed in grain crops. The optimal plan for the use of machine and tractor fleet can only be determined using optimization methods, since the composition of machines and tractors and their possible use have such a large number of options that it is almost impossible to simply sort them out and select the best. Further, the algorithm and the solution to the problem of optimal distribution of vehicles in grain production are considered.
Spatial ultrasonic cleaning process control based on its current state evaluation
Authors: Morkun Volodymyr , Kravchenko Olha
Published: June 2021

Ultrasonic cleaning is one of the most promising types of cleaning in terms of environmental friendliness, cost and efficiency. The condition of the cleaning body must be taken into account for optimal control of the ultrasonic cleaning process. This allows you to irradiate only those areas that really need it. The modelling of the process of ultrasonic cleaning of bodies of different configurations and the analysis of the parameters of ultrasonic responses at different stages of cleaning were performed. This allowed us to identify the parameters by which the assessment of the process should be formed. The main parameter was the change in the time of receipt of the threshold value of the signal, and the auxiliary - the change of the nonlinearity coefficient of the second order. The change in the time of receipt of the threshold value of the signal is an indicator of dirt peeling, and the change in the nonlinearity coefficient demonstrates the approach to the final result of cleaning. These parameters became clear input data for the 3-D fuzzy interval controller. The functions of affiliation were defined and the base of rules was formed. Modelling of the ultrasonic cleaning process using the established method of estimating the course of the process and the use of 3-D fuzzy interval controller showed about 35%energy savings.
Models and data quality in information systems applicable in the mining industry
Authors: Anastasova Yordanka , Yanev Nikolay
Published: June 2021

The purpose of this article is to present modern approaches to data storage and processing, as well as technologies to achieve the quality of data needed for specific purposes in the mining industry. The data format looks at NoSQL and NewSQL technologies, with the focus shifting from the use of common solutions (traditional RDBMS) to specific ones aimed at integrating data into industrial information systems. The information systems used in the mining industry are characterized by their specificity and diversity, which is a prerequisite for the integration of NoSQL data models in it due to their flexibility. In modern industrial information systems, data is considered high-quality if it actually reflects the described object and serves to make effective management decisions. The article also discusses the criteria for data quality from the point of view of information technology and that of its users. Technologies are also presented, providing an optimal set of necessary functions that ensure the desired quality of data in the information systems applicable in the industry. The format and quality of data in client-server based information systems is of particular importance, especially in the dynamics of data input and processing in information systems used in the mining industry.