bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of the Application of Reagent Combination in the Flotation of Non-sulfide Ore
Authors: Semyanova DV 
Published: February 2022

Abstract
A brief review of articles on the flotation of minerals using a combination of reagents is presented. It is noted that the main attention of the authors is aimed at studying the effect of the combination of collectors at the mineral-liquid interface. It was shown that one of the reagents or associates formed as a result of their joint action, possessing surface activity, can serve as a desorbed form of sorption and help reduce the induction time during the formation of a flotation complex.
Efficient use of process water in open pit mining of watercut lignite fields in the Kansk–Achinsk Basin
Authors: Reznik AV 
Published: February 2022

Abstract
The review of the use of process water in open pit mines and Russia and abroad helps find out that the conventional drainage technologies are inefficient for watercut lignite fields in the Kansk– Achinsk Basin. The author proposes a mining technology without preliminary drainage of watercut lignite seams, which ensures reduction in unproductive expenditures connected with coal mining and mitigation of the environmental impact.
An approach to differentiation and evaluation of mineral resource potential in coal mining
Authors: Gavrilov VL , Freidina EV 
Published: February 2022

Abstract
A mining company is a complex probabilistic system which functions in-between the geological and market environments. These environments are the carriers of various uncertainties which have influence on the business success. The authors discuss the background of differentiation of the mineral resource potential in terms of a coal field as transformation of a natural possibility to the manmade reality. It is distinguished between the limit, achievable and investment potentials. This type design takes into account the stages of geological exploration, study of coal properties and actual mining of the subsoil use object. The static, ergodic and non-ergodic categories of uncertainty are discussed.
Self-braking harmonic drives in mechanisms of mining machines
Authors: Baris AV 
Published: February 2022

Abstract
The conditions of self-braking in harmonic drives with a flexible wheel made in the form of a bushing chain are considered. A special feature of the harmonic drive is the design that has a dual generator and a double-crowned sprocket. This design allows to avoid skewing the chain under load. The criteria for self-braking in chain harmonic drives are defined. It is found that for chain harmonic drives in the range of gear ratios above 30, the effect of self-braking is provided. In the range of gear ratios up to 30, extra-centroid gearing is required to achieve the effect of self-braking.
Digital Field concept toward enhanced efficiency of coal mines
Authors: Khoyutanov EA , Nemova NA , Abeuov EA , Abdieva LM 
Published: February 2022

Abstract
Increasingly high uncertainty, complexity and variability of the mineral mining sector performance necessitates integration of digital technologies to improve business. Coal mines use DT much more less than the oil and gas industry. It seems a promising way to make use of the experience gained in the oil and gas industry to advance the Digital Field concept and Industry 4.0 as a basis for the sustainable tactical and strategic operation of business in coal mining. Digitalization of mineral resources and mineral reserves, geotechnologies and control provides a real-time picture of production and marketing. Furthermore, efficiency of coal exploration, mining, dressing and consumption is increased. It is expedient to use 3D modeling in evaluation of coal reserves, qualities and occurrence conditions to adapt mines to better and rival scenarios of development of structurally complex coal fields.
Lever-type percussive mechanisms developed by S. Abdraimov for soil compacting
Authors: Abdraimov ES , Bakirov BB , Shadiev MI 
Published: February 2022

Abstract
The designs of lever-type percussive mechanisms with the largest piston-rod developed by S. Abdraimov for soil compacting are considered. The results of kinematics research of three different diagrams including the largest base drawn by S. Abdraimov are presented. Basic parameters of these diagrams are determined and recommended to create high-frequency percussive mechanisms for soil compacting.
DEM simulations of dynamic impact on a rock mass complicated with a cavity and a tectonic disturbance
Authors: Khan GN , Rusin EP 
Published: February 2022

Abstract
The effect of a blast on a rock mass complicated with a cavity and a tectonic disturbance is considered. The disturbance is an extended broken rock layer located in the vicinity of the cavity. It is shown that the layer reduces the effectiveness of dynamic action on the cavity. The dependence of stability of the cavity exposed to the shock wave on the thickness of the layer and on the strength properties of the rock mass is revealed.
On the possibility of increasing the range of movement of rocks with the help of vibration transport
Authors: Kulikova EG , Usoltsev VM 
Published: February 2022

Abstract
The results of the experimental studies of the dynamics of the elastic working body of a vibratory conveying device equipped with two inertial vibration exciters are presented. The nature of the change in the mismatch of vibration source rotary frequencies and the degree of their mutual influence with an increase in the linear weight of bulk material has been established. The basic relationships of the structural and dynamic parameters of the vibrating device have been determined, which make it possible to increase the movement range of loose geomaterials.
Prediction of residual stress field on the surface of quenched 7055 aluminium alloy plates
Authors: Ren Weicai , Li Yanan , Zhang Yongan , Tong Youzhi , Li Xiwu , Li Zhihui , Xiong Baiqing 
Published: February 2022

Abstract
The effect of width on the surface quenching residual stress distribution in 7055 aluminium alloy plates of different width values was studied. The distribution of quenching residual stresses of the plates were studied by both simulation and experiment. Numerical simulation was carried out by using the Finite Element Method (FEM), and experimental measurements were conducted to verify the simulation work. The results show that the experimental distributions are approximately consistent with the simulation distribution. The stress fluctuations exist in the edge of the plate and the ratio of the fluctuation region decreases as the width increases. Considering the consistency of the centre point stress and actual length of the fluctuation region, we proposed a method to predict the surface residual stresses distribution using two-step data processing, providing a more convenient method for predicting the stress distribution of the plate with a large dimension by the plate with a small width.
Quantum battery based on quantum discord at room temperature
Authors: Cruz Clebson , Anka Maron F , Reis Mario S , Bachelard Romain , Santos Alan C 
Published: February 2022

Abstract
The study of advanced quantum devices for energy storage has attracted the attention of the scientific community in the past few years. Although several theoretical progresses have been achieved recently, experimental proposals of platforms operating as quantum batteries under ambient conditions are still lacking. In this context, this work presents a feasible realization of a quantum battery in a carboxylate-based metal complex, which can store a finite amount of extractable work under the form of quantum discord at room temperature, and recharge by thermalization with a reservoir. Moreover, the stored work can be evaluated through non-destructive measurements of the compound’s magnetic susceptibility. These results pave the way for the development of enhanced energy storage platforms through material engineering.
Classification of surface roughness during turning of forged EN8 steel using vibration signal processing and support vector machine
Authors: Guleria Vikrant , Kumar Vivek , Singh Pradeep K 
Published: February 2022

Abstract
The prediction of surface finish during machining is critical for determining the requirement of change in machining conditions. The present work methodology identifies different classes of surface finish during machining i.e., good, satisfactory, or poor. To identify the surface quality, the time-domain, frequency-domain, and fast fourier transform (FFT) image features of vibration data during machining were used. These features have been fed to the Bayesian optimized Support Vector Machine (SVM) model and compared. The comparison criteria considered are confusion matrix, Receiver Operator Characteristic (ROC) curve and accuracy. The model with FFT image features and cutting parameters as input provides 84.84% accurate classification. However, 91.90% accuracy has been observed using the model with frequency-domain features included with cutting parameters. The variation of cutting parameters concerning the response variable has been verified using Taguchi analysis and found satisfactory. The prediction of different classes of surface roughness based on vibration data will help in the automation of quality systems to accept or reject the product.
Spray rate effects on the NO2gas sensor properties of Ni-doped SnO2nanoflakes
Authors: Abduljabbar Qutaiba A , Radwan H A , Marei Jassim M , Rzaij Jamal M 
Published: February 2022

AbstractNickel-doped Tin dioxide (NSO) nanostructured thin films were deposited using chemical spray pyrolysis at 450 °C at various spray rates. The structural, morphological, and optical properties of the prepared nanostructured thin films were investigated to determine the effect of these parameters on the sensing properties of NSO film. X-ray diffraction revealed a polycrystalline structure with an increasing crystallite size as the deposition rate increased, which resulted in a gradual decrease in the bandgap. The FE-SEM images demonstrate that the deposition rate significantly influences the surface morphology and gas sensitivity performance. The sensitivity of the NO2gas sensor fabricated employing NSO thin films increased as the deposition rate, and NO2concentration was increased. At an optimal sensing temperature of 373 K, the maximum sensitivity was 120%, with a response and recovery time of 17 and 19 s, respectively.
Vision for a European metrology network for energy gases
Authors: Murugan Arul , Omoniyi Oluwafemi , Richardson Emma , Workamp Marcel , Baldan Annarita 
Published: February 2022

Abstract
As Europe moves towards decarbonising its energy infrastructure, new measurement needs will arise that require collaborative efforts between European National Metrology Institutes and Designated Institutes to tackle. Such measurement needs include flow metering of hydrogen or hydrogen enriched natural gas in the gas grid for billing, quality assurance of hydrogen at refuelling stations and equations of state for carbon dioxide in carbon capture and storage facilities. The European metrology network for energy gases for the first time provides a platform where metrology institutes can work together to develop a harmonised strategy, prioritise new challenges, and share expertise and capabilities to support the European energy gas industry to meet stringent EU targets for climate change and emissions reductions.
Sharing pizza in 𝑛 dimensions
Authors: Ehrenborg Richard , Morel Sophie , Readdy Margaret 
Published: February 2022

We introduce and prove the

n
n

-dimensional Pizza Theorem: Let

H

\mathcal {H}

be a hyperplane arrangement in

R

n

\mathbb {R}^{n}

. If

K
K

is a measurable set of finite volume, the pizza quantity of

K
K

is the alternating sum of the volumes of the regions obtained by intersecting

K
K

with the arrangement

H

\mathcal {H}

. We prove that if

H

\mathcal {H}

is a Coxeter arrangement different from

A

1

n

A_{1}^{n}

such that the group of isometries

W
W

generated by the reflections in the hyperplanes of

H

\mathcal {H}

contains the map

−

i
d

-\mathrm {id}

, and if

K
K

is a translate of a convex body that is stable under

W
W

and contains the origin, then the pizza quantity of

K
K

is equal to zero. Our main tool is an induction formula for the pizza quantity involving a subarrangement of the restricted arrangement on hyperplanes of

H

\mathcal {H}

that we call the even restricted arrangement. More generally, we prove that for a class of arrangements that we call even (this includes the Coxeter arrangements above) and for a sufficiently symmetric set

K
K

, the pizza quantity of

K
+
a

K+a

is polynomial in

a
a

for

a
a

small enough, for example if

K
K

is convex and

0
∈
K
+
a

0\in K+a

. We get stronger results in the case of balls, more generally, convex bodies bounded by quadratic hypersurfaces. For example, we prove that the pizza quantity of the ball centered at

a
a

having radius

R
≥
‖
a
‖

R\geq \|a\|

vanishes for a Coxeter arrangement

H

\mathcal {H}

with

|

H

|

−
n

|\mathcal {H}|-n

an even positive integer. We also prove the Pizza Theorem for the surface volume: When

H

\mathcal {H}

is a Coxeter arrangement and

|

H

|

−
n

|\mathcal {H}| - n

is a nonnegative even integer, for an

n
n

-dimensional ball the alternating sum of the

(
n
−
1
)

(n-1)

-dimensional surface volumes of the regions is equal to zero.
A relation among Hopkins’ Picard groups of the localized categories with respect to finite wedges of the Morava 𝐾-theories
Authors: Shimomura Katsumi 
Published: February 2022

We work in the stable homotopy category of

p
p

-local spectra for a fixed prime number

p
p

. Let

E
E

be a spectrum and

L

E

\mathcal {L}_E

denote the stable homotopy category of localized spectra with respect to

E
E

in the sense of Bousfield. Then, M. Hopkins introduced a Picard group

P
i
c
(

L

E

)

Pic(\mathcal {L}_E)

of the category

L

E

\mathcal {L}_E

. If the spectra

E
E

and

F
F

satisfy the relation

⟨

E

⟩

≥

⟨
F
⟩

\left \langle {E}\right \rangle \ge \left \langle F\right \rangle

of the Bousfield classes, then we have a homomorphism

ℓ
:
P
i
c
(

L

E

)
→
P
i
c
(

L

F

)

\ell \colon Pic(\mathcal {L}_E)\to Pic(\mathcal {L}_F)

. We consider the spectra

K
m
n

=
E
(
n
)
∧
M

J
m

K_m^n=E(n)\wedge MJ_m

for the

n
n

-th Johnson-Wilson spectrum

E
(
n
)

E(n)

and a type

m
m

generalized Moore spectrum

M

J
m

MJ_m

for

0
≤
m
≤
n

0\le m\le n

. For

E
=

K
m
n

E=K_m^n

, we have a subgroup

P
i

c
0

(

L

E

)

Pic^0({\mathcal {L}_E})

of

P
i
c
(

L

E

)

Pic(\mathcal {L}_E)

consisting of exotic elements. In this paper, we study the homomorphism

ℓ
:
P
i

c
0

(

L

E
(
n
)

)
→
P
i

c
0

(

L

K
m
n

)

\ell \colon Pic^0({\mathcal {L}_{E(n)}})\to Pic^0({\mathcal {L}_{K_m^n}})

, and give conditions under which it is an isomorphism. This is a generalization of the result

P
i

c
0

(

L

2

)
≅

κ
2

Pic^0(\mathcal {L}_2)\cong \kappa _2

(P. Goerss, H.-W. Henn, M. Mahowald, and C. Rezk [J. Topol. 8 (2015), 267–294, Remark. 6.5]) for

(
p
,
n
,
m
)
=
(
3
,
2
,
2
)

(p,n,m)=(3,2,2)

.
Effects of Chronic Burden Across Multiple Domains and Experiences of Daily Stressors on Negative Affect
Authors: Lockwood Kimberly G , Peddie Luke , Crosswell Alexandra D , Hives Benjamin A , Slopen Natalie , Almeida David M , Puterman Eli 
Published: February 2022

Abstract

Background
Exposure to chronic psychological stress across multiple life domains (multi-domain chronic burden) is associated with poor health. This may be because multi-domain chronic burden influences daily-level emotional processes, though this hypothesis has not been thoroughly tested.

Purpose
The current study tested whether (a) multi-domain chronic burden is associated with greater exposure to daily stressors and (b) multi-domain chronic burden compounds negative affect on days with stressors compared to stressor-free days.

Methods
The MIDUS Study (Wave II) and the National Study of Daily Experiences sub-study were conducted from 2004 to 2006 (N = 2,022). Participants reported on eight life domains of psychological stress used to create a multi-domain chronic burden summary score. For eight consecutive days, participants reported the daily occurrence of stressful events and daily negative affect.

Results
Participants with greater multi-domain chronic burden were significantly more likely to report daily stressors. There was also a significant interaction between multi-domain chronic burden and daily stressors on negative affect: participants with higher multi-domain chronic burden had greater negative affect on stressor days than stressor-free days compared to those with lower multi-domain chronic burden.

Conclusion
Participants with higher multi-domain chronic burden were more likely to report daily stressors and there was a compounding effect of multi-domain chronic burden and daily stressors on negative affect. These results suggest that experiencing a greater amount of psychological stress across multiple life domains may make daily stressors more toxic for daily affect.
Sincast: a computational framework to predict cell identities in single-cell transcriptomes using bulk atlases as references
Authors: Deng Yidi , Choi Jarny , Lê Cao Kim-Anh 
Published: February 2022

Abstract
Characterizing the molecular identity of a cell is an essential step in single-cell RNA sequencing (scRNA-seq) data analysis. Numerous tools exist for predicting cell identity using single-cell reference atlases. However, many challenges remain, including correcting for inherent batch effects between reference and query data andinsufficient phenotype data from the reference. One solution is to project single-cell data onto established bulk reference atlases to leverage their rich phenotype information. Sincast is a computational framework to query scRNA-seq data by projection onto bulk reference atlases. Prior to projection, single-cell data are transformed to be directly comparable to bulk data, either with pseudo-bulk aggregation or graph-based imputation to address sparse single-cell expression profiles. Sincast avoids batch effect correction, and cell identity is predicted along a continuum to highlight new cell states not found in the reference atlas. In several case study scenarios, we show that Sincast projects single cells into the correct biological niches in the expression space of the bulk reference atlas. We demonstrate the effectiveness of our imputation approach that was specifically developed for querying scRNA-seq data based on bulk reference atlases. We show that Sincast is an efficient and powerful tool for single-cell profiling that will facilitate downstream analysis of scRNA-seq data.
Repeat hepatic resection versus percutaneous ablation for the treatment of recurrent hepatocellular carcinoma: meta-analysis
Authors: Yuan Bao-Hong , Zhu Yan-Kun , Zou Xu-Ming , Zhou Hao-Dong , Li Ru-Hong , Zhong Jian-Hong 
Published: February 2022

Abstract

Background
The efficacy of repeat hepatic resection (rHR) in the treatment of recurrent hepatocellular carcinoma compared with radiofrequency or microwave ablation after resection of the primary tumour remains controversial. A systematic review and meta-analysis were performed to compare the safety and efficacy of these procedures.

Methods
PubMed, Embase, Scopus, Cochrane Library, and China National Knowledge Infrastructure databases were systematically searched to identify related studies published before 10 October 2021. Overall and recurrence-free survival after different treatments were compared based on pooled hazard ratios with a random-effects model.

Results
Two randomized clinical trials and 28 observational studies were included, involving 1961 and 2787 patients who underwent rHR and ablation respectively. Median perioperative mortality in both groups was zero but patients in the rHR group had higher median morbidity rates (17.0 per cent) than those in the ablation group (3.3 per cent). rHR achieved significantly longer recurrence-free survival than ablation (HR 0.79, 95 per cent c.i. 0.70 to 0.89, P &lt; 0.001), while both groups had similar overall survival (HR 0.93, 95 per cent c.i. 0.83 to 1.04, P = 0.18).

Conclusion
rHR and ablation based on radio- or microwaves are associated with similar overall survival in patients with recurrent hepatocellular carcinoma after resection of the primary tumour.
On The Axioms Of Common Meadows: Fracterm Calculus, Flattening And Incompleteness
Authors: Bergstra Jan A , Tucker John V 
Published: February 2022

Abstract
Common meadows are arithmetic structures with inverse or division, made total on $0$ by a flag $\bot $ for ease of calculation. We examine some axiomatizations of common meadows to clarify their relationship with commutative rings and serve different theoretical agendas. A common meadow fracterm calculus is a special form of the equational axiomatization of common meadows, originally based on the use of division on the rational numbers. We study axioms that allow the basic process of simplifying complex expressions involving division. A useful axiomatic extension of the common meadow fracterm calculus imposes the requirement that the characteristic of common meadows be zero (using a simple infinite scheme of closed equations). It is known that these axioms are complete for the full equational theory of common cancellation meadows of characteristic $0$. Here, we show that these axioms do not prove all conditional equations which hold in all common cancellation meadows of characteristic $0$.
Cardiopulmonary assessment prior to returning to high-hazard occupations post-symptomatic COVID-19 infection: a position statement of the Aviation and Occupational Cardiology Task Force of the European Association of Preventive Cardiology
Authors: Rienks Rienk , Holdsworth David , Davos Constantinos H , Halle Martin , Bennett Alexander , Parati Gianfranco , Guettler Norbert , Nicol Edward D 
Published: February 2022

Abstract
This article provides an overview of the recommendations of the Aviation and Occupational Cardiology Task Force of the European Association of Preventive Cardiology on returning individuals to work in high-hazard occupations (such as flying, diving, and workplaces that are remote from healthcare facilities) following symptomatic Coronavirus Disease 2019 (COVID-19) infection. This process requires exclusion of significant underlying cardiopulmonary disease and this consensus statement (from experts across the field) outlines the appropriate screening and investigative processes that should be undertaken. The recommended response is based on simple screening in primary healthcare to determine those at risk, followed by first line investigations, including an exercise capacity assessment, to identify the small proportion of individuals who may have circulatory, pulmonary, or mixed disease. These individuals can then receive more advanced, targeted investigations. This statement provides a pragmatic, evidence-based approach for those (in all occupations) to assess employee health and capacity prior to a return to work following severe disease, or while continuing to experience significant post-COVID-19 symptoms (so-called ‘long-COVID’ or post-COVID-19 syndrome).