bluuebunny/crossref_metadata_2025 huggingface dataset:
Hybrid plasmonic nano-emitters with controlled single quantum emitter positioning on the local excitation field
Authors: Ge Dandan , Marguet Sylvie , Issa Ali , Jradi Safi , Nguyen Tien Hoa , Nahra Mackrine , Béal Jéremie , Deturche Régis , Chen Hongshi , Blaize Sylvain , Plain Jérôme , Fiorini Céline , Douillard Ludovic , Soppera Olivier , Dinh Xuan Quyen , Dang Cuong , Yang Xuyong , Xu Tao , Wei Bin , Sun Xiao Wei , Couteau Christophe , Bachelot Renaud
Published: July 2020

Hybrid plasmonic nano-emitters based on the combination of quantum dot emitters (QD) and plasmonic nanoantennas open up new perspectives in the control of light. However, precise positioning of any active medium at the nanoscale constitutes a challenge. Here, we report on the optimal overlap of antenna’s near-field and active medium whose spatial distribution is controlled via a plasmon-triggered 2-photon polymerization of a photosensitive formulation containing QDs. Au nanoparticles of various geometries are considered. The response of these hybrid nano-emitters is shown to be highly sensitive to the light polarization. Different light emission states are evidenced by photoluminescence measurements. These states correspond to polarization-sensitive nanoscale overlap between the exciting local field and the active medium distribution. The decrease of the QD concentration within the monomer formulation allows trapping of a single quantum dot in the vicinity of the Au particle. The latter objects show polarization-dependent switching in the single-photon regime.
A database of human gait performance on irregular and uneven surfaces collected by wearable sensors
Authors: Luo Yue , Coppola Sarah M. , Dixon Philippe C. , Li Song , Dennerlein Jack T. , Hu Boyi
Published: July 2020

Gait analysis has traditionally relied on laborious and lab-based methods. Data from wearable sensors, such as Inertial Measurement Units (IMU), can be analyzed with machine learning to perform gait analysis in real-world environments. This database provides data from thirty participants (fifteen males and fifteen females, 23.5 ± 4.2 years, 169.3 ± 21.5 cm, 70.9 ± 13.9 kg) who wore six IMUs while walking on nine outdoor surfaces with self-selected speed (16.4 ± 4.2 seconds per trial). This is the first publicly available database focused on capturing gait patterns of typical real-world environments, such as grade (up-, down-, and cross-slopes), regularity (paved, uneven stone, grass), and stair negotiation (up and down). As such, the database contains data with only subtle differences between conditions, allowing for the development of robust analysis techniques capable of detecting small, but significant changes in gait mechanics. With analysis code provided, we anticipate that this database will provide a foundation for research that explores machine learning applications for mobile sensing and real-time recognition of subtle gait adaptations.
Author Correction: Immediate early gene fingerprints of multi-component behaviour
Authors: Rook Noemi , Letzner Sara , Packheiser Julian , Güntürkün Onur , Beste Christian
Published: July 2020

An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Combined PLT and NE to predict the prognosis of patients with locally advanced cervical cancer
Authors: Wang Han , Chen Wen-Ming , Zhou Yong-Heng , Shi Jian-Ping , Huang Yue-qing , Wang Wen-Jie
Published: July 2020

Cervical cancer is one of the most common tumors in women. Neutrophils (NEs) and platelets (PLTs) are components of cells in circulating blood. NEs are one of the components of white blood cells (WBCs), accounting for the vast majority of WBCs, recognized as one of the indicators of inflammation. PLTs are associated with thrombosis and inflammation. Both of them play an important role in tumor growth and metastasis. According to pre-radiotherapy PLT and NE media levels, we divided the patients into three groups: PLT and NE both high levels group, single high level group and both low group. By using COX regression models and nomogram, a prognostic model for patients was established. Both high levels of pre-radiotherapy PLT and NE group or high levels of post-radiotherapy PLT and NE group were correlated with worst overall survival (OS) compared with the other two groups. PLT and NE were correlated with outcomes of the patients with locally advanced cervical cancer.
Circuit Depth Reduction for Gate-Model Quantum Computers
Authors: Gyongyosi Laszlo , Imre Sandor
Published: July 2020

Quantum computers utilize the fundamentals of quantum mechanics to solve computational problems more efficiently than traditional computers. Gate-model quantum computers are fundamental to implement near-term quantum computer architectures and quantum devices. Here, a quantum algorithm is defined for the circuit depth reduction of gate-model quantum computers. The proposed solution evaluates the reduced time complexity equivalent of a reference quantum circuit. We prove the complexity of the quantum algorithm and the achievable reduction in circuit depth. The method provides a tractable solution to reduce the time complexity and physical layer costs of quantum computers.
Propofol suppresses hepatocellular carcinoma by inhibiting NET1 through downregulating ERK/VEGF signaling pathway
Authors: Fei Guoxiong , Cao Meili , Ge Chunlin , Cui Longjiu
Published: July 2020

Hepatocellular carcinoma (HCC) is the leading cause of tumor death in China with high mortality since its strong metastatic potential. Currently, treatment against advanced HCC is poorly efficient and thus screening new drugs to prevent the HCC invasion is of great significance to improve the survival rate of patients with HCC. From the results of this study, we concluded that propofol, a widely used anesthetics could prevent the proliferation by MTT assay. The scratch wound and invasion assays showed that migratory property and invasiveness in HCC cells SMMC-7721 was inhibited by propofol. This process was probably mediated by NET1 since NET1 overexpression offset the repressive effect of propofol on the invasiveness and migratory ability of SMMC-7721 cells. Furthermore, propofol treatment also reduced p-ERK1/2 and VEGF level by western blot analysis. Similar observation was found when NET1 was silenced. Thus, the results of this study provided valuable clinical therapy potential of propofol against liver cancer. We also disclosed molecular mechanism underlying the regulation of invasion and migration in HCC cells by NET1.
Interactions in multi-pattern Müllerian communities support origins of new patterns, false structures, imperfect resemblance and mimetic sexual dimorphism
Authors: Motyka Michal , Bocek Matej , Kusy Dominik , Bocak Ladislav
Published: July 2020

Mimicry is a hot spot of evolutionary research, but de novo origins of aposematic patterns, the persistence of multiple patterns in Müllerian communities, and the persistence of imperfect mimics still need to be investigated. Local mimetic assemblages can contain up to a hundred of species, their structure can be a result of multiple dispersal events, and the gradual build-up of the communities. Here, we investigate the structure of lowland and mountain mimetic communities of net-winged beetles by sampling the Crocker Range in north-eastern Borneo and neighbouring regions. The local endemics evolved from the Bornean lowland fauna which is highly endemic at the species level. We inferred that metriorrhynchine net-winged beetles evolved in high elevations yellow/black and reticulate aposematic high-contrast signals from a widespread low-contrast brown/black pattern. As the mountain range is ~ 6 million years old, and these patterns do not occur elsewhere, we assume their in situ origins. We demonstrate that a signal with increased internal contrast can evolve de novo in a mimetic community and can persist despite its low frequency. Additionally, a similar aposematic signal evolves from different structures and its similarity is imperfect. The community with multiple patterns sets conditions for the evolution of aposematic sexual dimorphism as demonstrated by the yellow/black male and reticulate female pattern of Micronychus pardus. These insights elucidate the complex character of the evolution of mimetic signalling in the dynamically diversifying biota of high tropical mountains.
Hemostatic nanotechnologies for external and internal hemorrhage management
Authors: Wang Liying , You Xinru , Dai Chunlei , Tong Tong , Wu Jun
Published: July 2020

Hemostatic nanotechnologies promote the development of various hemostatic materials for external and internal hemorrhage management.
A versatile platform for bioimaging based on colominic acid-decorated upconversion nanoparticles
Authors: Demina Polina A. , Sholina Natalya V. , Akasov Roman A. , Khochenkov Dmitry A. , Arkharova Natalia A. , Nechaev Andrei V. , Khaydukov Evgeny V. , Generalova Alla N.
Published: July 2020

Non-cytotoxic upconversion nanoparticles decorated with colominic acid exhibit the prolonged circulation time in the bloodstream compared to PEG leading to their effective accumulation in the inflammation site and visualization of blood vessels.
Spinel-structure catalyst catalyzing CO2 hydrogenation to full spectrum alkenes with an ultra-high yield
Authors: Guo Lisheng , Li Jie , Cui Yu , Kosol Rungtiwa , Zeng Yan , Liu Guangbo , Wu Jinhu , Zhao Tiansheng , Yang Guohui , Shao Lishu , Zhan Peng , Chen Jienan , Tsubaki Noritatsu
Published: July 2020

A series of spinel-like catalysts (ZnFe2O4) are tailor-made synthesized through a solvent-thermal synthesis for CO2 hydrogenation.
The mutagenesis of a single site for enhancing or reversing the enantio- or regiopreference of cyclohexanone monooxygenases
Authors: Hu Yujing , Xu Weihua , Hui Chenggong , Xu Jian , Huang Meilan , Lin Xianfu , Wu Qi
Published: July 2020

Single mutation of a “second sphere” residue of CHMOs could control its enantio- and regiopreference optionally.
Organoclay-derived lamellar silicon carbide/carbon composite as an ideal support for Pt nanoparticles: facile synthesis and toluene oxidation performance
Authors: Zhu Runliang , Chen Qingze , Du Jing , He Qiuzhi , Liu Peng , Xi Yunfei , He Hongping
Published: July 2020

A lamellar SiC/C support with hierarchical porosity, available anchoring sites, and good stability was synthesized from organoclay, causing an enhanced toluene oxidation performance of Pt-loaded SiC/C.
Au nanocone array with 3D hotspots for biomarker chips
Authors: Zhu Qi , Zhao Xiaoyu , Zhang Xiaolong , Zhu Aonan , Gao Renxian , Zhang Yongjun , Wang Yaxin , Chen Lei
Published: July 2020

AFP-L3 is one of the most important biomarkers for the early diagnosis of liver cancer.
Electrically precise control of the spin polarization of electronic transport at the single-molecule level
Authors: Guo Yan-Dong , Wang Jin-Jie , Zeng Hong-Li , Yang Yu-Rong , Xu Xin-Xin , Yan Xiao-Hong
Published: July 2020

The spin polarization of electronic transmission could be electrically modulated from −100% to 100% at the single-molecule level.
Spin controlled surface chemistry: alkyl desorption from Si(100)-2×1 by nonadiabatic hydrogen elimination
Authors: Pohlman Andrew J. , Kaliakin Danil S. , Varganov Sergey A. , Casey Sean M.
Published: July 2020

A thermally-driven, nonadiabatic spin transition accelerates β-hydrogen elimination reactions at the silicon surface.
Understanding alcohol aggregates and the water hydrogen bond network towards miscibility in alcohol solutions: graph theoretical analysis
Authors: Choi Seungeui , Parameswaran Saravanan , Choi Jun-Ho
Published: July 2020

Morphologically distinct alcohol aggregates are proposed as water-compatible and water-incompatible depending upon their interaction with water H-bond network, while the former disrupt water structure and the later preferentially self-associate.
Quantum chemical topology and natural bond orbital analysis of M–O covalency in M(OC6H5)4 (M = Ti, Zr, Hf, Ce, Th, Pa, U, Np)
Authors: Berryman Victoria E. J. , Shephard Jacob J. , Ochiai Tatsumi , Price Amy N. , Arnold Polly L. , Parsons Simon , Kaltsoyannis Nikolas
Published: July 2020

VXC(M,O): the exchange–correlation metric quantifies covalency between M and O atomic basins in M(OC6H5)4 (M = Ti, Zr, Hf, Ce, Th, Pa, U, Np).
Performance of DFT functionals for calculating the second-order nonlinear optical properties of dipolar merocyanines
Authors: Lescos Laurie , Sitkiewicz Sebastian P. , Beaujean Pierre , Blanchard-Desce Mireille , Champagne Benoît , Matito Eduard , Castet Frédéric
Published: July 2020

Evolution of the static HRS hyperpolarizability of a tricyanopropylidene-based merocyanine dye with the length of the polyenic bridge, as calculated using various ab initio and DFT approximations.
Downstream processing of lignin derived feedstock into end products
Authors: Wong Sie Shing , Shu Riyang , Zhang Jiaguang , Liu Haichao , Yan Ning
Published: July 2020

This review provides critical analysis on various downstream processes to convert lignin derived feedstock into fuels, chemicals and materials.
A post-synthesis surface reconstructed carbon aerogel as an enhanced oxygen reduction reaction catalyst for zinc–air batteries
Authors: Pang Yanhua , Mo Zaiyong , Wang Hui , Linkov Vladimir , Wang Xuyun , Wang Rongfang
Published: July 2020

After calcination and erosion, aerogel carbon materials have been subjected to surface reconstruction under the action of carbon fixation by iron at high temperature, resulting the change of specific surface area and ratio of surface species.
On-chip analysis of atmospheric ice-nucleating particles in continuous flow
Authors: Tarn Mark D. , Sikora Sebastien N. F. , Porter Grace C. E. , Wyld Bethany V. , Alayof Matan , Reicher Naama , Harrison Alexander D. , Rudich Yinon , Shim Jung-uk , Murray Benjamin J.
Published: July 2020

A microfluidic platform for the analysis of atmospheric ice-nucleating particles (INPs) via the freezing of thousands of droplets in continuous flow.
OSTE+ for in situ SAXS analysis with droplet microfluidic devices
Authors: Lange Tobias , Charton Sophie , Bizien Thomas , Testard Fabienne , Malloggi Florent
Published: July 2020

Thin full OSTE+ chip fabrication and characterization for in situ SAXS studies.
Simulation study on the structural and dynamic properties of ethanol confined in nanochannels
Authors: Chen Xiuting , Zhu Jianzhuo , Xu Chao , Peng Qiuming , Li Xingyuan , Su Jiguo
Published: July 2020

The structural and dynamic properties of ethanol molecules in nanochannels of various diameters have been studied using molecular dynamics simulations.
A novel pillar[5]arene-based emission enhanced supramolecular sensor for dual-channel selective detection and separation of Hg2+
Authors: Hu Jian-Peng , He Jun-Xia , Fang Hu , Yang Hao-Hang , Zhang Qi , Lin Qi , Yao Hong , Zhang You-Ming , Wei Tai-Bao , Qu Wen-Juan
Published: July 2020

We constructed a supramolecular sensor (APRA–G) via a host–guest inclusion interaction between a rhodamine hydrazide-functionalized pillar[5]arene (APRA) and a bipyridine salt guest (G), which formed a stable dimer.
Decoration of mesoporous carbon electrodes with tin oxide to boost their supercapacitive performance
Authors: Le Hang T. T. , Ngo Duc Tung , Dang Viet-Anh-Dung , Hoang Thuy T. B. , Park Chan-Jin
Published: July 2020

A unique material comprising mesoporous carbon decorated with tin oxide was synthesised by facile incipient wetness impregnation for enhanced charge storage.
Correction: Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state
Authors: Wang Siyu , Zhu Yu-quan , Zhang Yuhong , Wang Binxia , Yan Hong , Liu Wendi , Lin Yanjun
Published: July 2020

Correction for ‘Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state’ by Siyu Wang et al., Nanoscale, 2020, 12, 12817–12823, DOI: 10.1039/D0NR02796K.
Decagram scale production of deuterated mineral oil and polydecene as solvents for polymer studies in neutron scattering
Authors: Klenner Mitchell A. , Cagnes Marina , Wood Kathleen , Mita Kazuki , Kishimoto Mizuki , Darwish Tamim
Published: July 2020

Decagram scale syntheses of deuterated mineral oil (d-MO) and poly(1-decene) (d-PD) were achieved by direct catalytic hydrothermal H/D exchange reaction in D2O.
Electrochemical investigation of adsorption of graphene oxide at an interface between two immiscible electrolyte solutions
Authors: Qiu Haiyan , Jiang Tao , Wang Xiaoyuan , Zhu Lin , Wang Qingwei , Zhao Yun , Ge Jianjian , Chen Yong
Published: July 2020

The adsorption behavior of graphene oxide (GO) nanosheets at an interface between two immiscible electrolyte solutions (ITIES) was electrochemically investigated firstly by using cyclic voltammetry (CV) and alternating current voltammetry (ACV).
Preparative separation of mangiferin glycosides by high speed counter current chromatography and comparison of their antioxidant and antitumor activities
Authors: Xu Tingting , Wu Xueming
Published: July 2020

High-speed counter-current chromatography is an efficient method for separation of mangiferin glycosides from enzymatic glycosylation.
Nickel-catalyzed three-component olefin reductive dicarbofunctionalization to access alkylborates
Authors: Wang Xiao-Xu , Lu Xi , He Shi-Jiang , Fu Yao
Published: July 2020

Nickel-catalyzed three-component olefin reductive dicarbofunctionalization for constructing alkylborates was achieved.
Cellular uptake and targeting of low dispersity, dual emissive, segmented block copolymer nanofibers
Authors: Street Steven T. G. , He Yunxiang , Jin Xu-Hui , Hodgson Lorna , Verkade Paul , Manners Ian
Published: July 2020

The cellular uptake of tailored, modular, and segmented low dispersity nanofibers with a crystalline π-conjugated core has been studied.
Correction: 3D aggregation of cells in packed microgel media
Authors: Morley Cameron D. , Tordoff Jesse , O’Bryan Christopher S. , Weiss Ron , Angelini Thomas E.
Published: July 2020

Correction for ‘3D aggregation of cells in packed microgel media’ by Cameron D. Morley et al., Soft Matter, 2020, DOI: 10.1039/d0sm00517g.
Facile and scalable synthesis of a sulfur, selenium and nitrogen co-doped hard carbon anode for high performance Na- and K-ion batteries
Authors: Liu Yu , Dai Haodong , An Yongkang , Fu Lijun , An Qinyou , Wu Yuping
Published: July 2020

Sulfur, selenium and nitrogen co-doped hard carbon is prepared by a facile and scalable solid reaction process, exhibiting excellent Na+/K+ storage performance.
In situ fabricated photo-electro-catalytic hybrid cathode for light-assisted lithium–CO2 batteries
Authors: Li Zhe , Li Ma-Lin , Wang Xiao-Xue , Guan De-Hui , Liu Wan-Qiang , Xu Ji-Jing
Published: July 2020

The proposed photo-assisted Li–CO2 battery is composed of a Li anode, a non-aqueous electrolyte, a separator, and SiC/RGO sprayed on carbon paper as a carbon dioxide and photo-electrode.
Small-molecule electrolytes with different ionic functionalities as a cathode buffer layer for polymer solar cells
Authors: Jeong Mijin , Moon Doo Kyung , Kim Hyun Sung , Kim Joo Hyun
Published: July 2020

Small-molecule electrolytes were designed and synthesized as the cathode interlayer in inverted polymer solar cells.
Architecting epitaxial-lattice-mismatch-free (LMF) zinc oxide/bismuth oxyiodide nano-heterostructures for efficient photocatalysis
Authors: Feng Han , Liang Liangliang , Wu Weiyi , Huang Zhaohong , Liu Yu
Published: July 2020

Developing efficient photocatalysts has been proved to be of great importance for many emerging applications, including the removal of recalcitrant organic pollutants in wastewaters and transforming solar energy into important chemical feedstocks.
Merkel cell polyomavirus small tumour antigen activates the p38 MAPK pathway to enhance cellular motility
Authors: Dobson Samuel J. , Anene Anthony , Boyne James R. , Mankouri Jamel , Macdonald Andrew , Whitehouse Adrian
Published: July 2020

Merkel cell carcinoma (MCC) is an aggressive skin cancer with high rates of recurrence and metastasis. Merkel cell polyomavirus (MCPyV) is associated with the majority of MCC cases. MCPyV-induced tumourigenesis is largely dependent on the expression of the small tumour antigen (ST). Recent findings implicate MCPyV ST expression in the highly metastatic nature of MCC by promoting cell motility and migration, through differential expression of cellular proteins that lead to microtubule destabilisation, filopodium formation and breakdown of cell–cell junctions. However, the molecular mechanisms which dysregulate these cellular processes are yet to be fully elucidated. Here, we demonstrate that MCPyV ST expression activates p38 MAPK signalling to drive cell migration and motility. Notably, MCPyV ST-mediated p38 MAPK signalling occurs through MKK4, as opposed to the canonical MKK3/6 signalling pathway. In addition, our results indicate that an interaction between MCPyV ST and the cellular phospatase subunit PP4C is essential for its effect on p38 MAPK signalling. These results provide novel opportunities for the treatment of metastatic MCC given the intense interest in p38 MAPK inhibitors as therapeutic agents.
Kinematic distinction of the two subpopulations of X-ray pulsars
Authors: Prišegen M.
Published: July 2020

Context. The population of Be/X-ray binaries shows strong evidence of bimodality, especially in the spin period of neutron stars. Several physical mechanisms may produce this bimodality. The most favored candidate mechanisms are two distinct supernova channels or different accretion modes of the neutron stars in Be/X-ray binaries. Investigating the kinematics of these systems may provide some additional insight into the physics of this bimodality.

Aims. If the two Be/X-ray binary subpopulations arise from two distinct supernova types, then the two subpopulations should have different peculiar (systemic) velocities. This can be tested either directly, by measuring the velocity of the system, or indirectly, by measuring the position of the system with respect to its birthplace. A difference in the peculiar velocity magnitude between the subpopulations would favor the supernova hypothesis, and the lack of this difference would suggest that the accretion hypothesis is a more favorable option to explain the bimodality.

Methods. Using the most recent Gaia dataset and the newest catalogs of Small Magellanic Cloud (SMC) star clusters, we analyzed the tangential peculiar velocities of Be/X-ray binaries in the Galaxy and the positions of Be/X-ray binaries in the SMC. We used the distance of the system from the nearest young star cluster as a proxy to the tangential velocity of the system. We applied statistical testing to investigate whether the two subpopulations that are divided by the spin of the neutron star are also kinematically distinct.

Results. There is evidence that the two subpopulations are indeed kinematically distinct. However, the tangential peculiar velocities of the two subpopulations are the reverse from what is expected from the distinct supernova channel hypothesis. We find some marginal evidence (p ≈ 0.005) that the Galactic Be/X-ray binaries from the short-spin subpopulation have systematically higher peculiar velocities than the systems from the long-spin subpopulation. The same effect, but weaker, is also recovered for the SMC Be/X-ray binaries for all considered cluster catalogs. The unexpected difference in the peculiar velocities between the two subpopulations of Be/X-ray binaries contradicts these two hypotheses, and an alternative physical explanation for this may be needed.
Nonlinear coupling of Alfvén and slow magnetoacoustic waves in partially ionized solar plasmas
Authors: Ballester J. L. , Soler R. , Terradas J. , Carbonell M.
Published: July 2020

Context.Partially ionized plasmas constitute an essential ingredient of the solar atmosphere since layers such as the chromosphere and the photosphere and structures such as prominences and spicules are made of this plasma. On the other hand, ground- and space-based observations have indicated the presence of oscillations in partially ionized layers and structures of the solar atmosphere, which have been interpreted in terms of magnetohydrodynamic (MHD) waves.

Aims.Our aim is to study the temporal behavior of nonlinear Alfvén waves, and the subsequent excitation of field-aligned motions and perturbations, in a partially ionized plasma when dissipative mechanisms such as ambipolar diffusion, radiative losses, and thermal conduction are taken into account.

Methods.First, we applied the regular perturbations method for small-amplitude initial perturbations to obtain the temporal behavior of perturbations. Then we solved the full set of nonlinear MHD equations for larger values of the initial amplitude.

Results.We obtain analytical and numerical solutions to first-, second-, and third-order systems of equations and study the effects produced by ambipolar diffusion and thermal mechanisms on the temporal behavior of Alfvén and slow waves. We also study how the majority of the energy is transferred from the Alfvén waves to plasma internal energy. After numerically solving the full nonlinear equations when a large amplitude is assumed, the profile of the perturbations displays the typical sawtooth profile characteristic of associated shocks.

Conclusions.When ambipolar diffusion is taken into account, first-order Alfvén waves are damped in time, while second-order perturbations are undamped. However, due to the release of heat produced by ambipolar diffusion, other physical effects that modify the physical conditions in the spatial domain under consideration appear. On the other hand, the second-order perturbations are damped by thermal effects with a damping time that can be longer or shorter than that of Afvén waves. Therefore, after the initial excitation, Alfvén waves can be quickly damped, while slow waves remain in the plasma for a longer time, and vice versa.
Theoretical basis for calculation of the quarries sides for collapse
Authors: Zhabko Andrey , Volkomorova Natalya , Zhabko Natalya
Published: July 2020

The paper is devoted to the development of a mathematical apparatus for cal-culation of the quarries sides for collapse. The relevance of the paper lies in the fact that today there are no methods for calculation of the quarries and open-pits sides for collapse, however, the collapse of the sides or ledges in quarries is the most dangerous and unpredictable process. The main idea of the paper is to use, when calculating the collapse, not a strength criterion, but a criterion that describes the elastic limit of rocks. According to modern con-cepts, the formation of extremely stressed zones in the entire loaded region begins exactly at the elastic limit, in contrast to the ultimate strength, upon reaching which a single fracture surface is formed. Thus, the ultimate strength should be identified with landslide phenomena, and the elastic limit with the collapse of the rock mass. Methods of mathematical analysis and continuum mechanics -method of ultimate stress state, are widely used in the paper.
A study on the possibility of improving sulfide ore preparation characteristics using the pneumatic separation process
Authors: Zavialov Sergey , Morozov Yuri , Mamonov Roman
Published: July 2020

The size, density of the particles and their shape play a significant role in the effectiveness of the pneumatic separation process. An experiment held using a lab machine revealed that the shape of the particles affects their warping from the air-flow. Research has shown that the airflow produced with the flat or narrow side of the ore which are flat and have a large form factor are more likely to be affected by the warping process. The impact of the ore shapes on the results of separating the pieces in terms of their density during the pneumatic separation process can be decreased by producing a structured feed-through into the air-flow using the flat side or by improving the previously selected ore pieces of a flat shape.
Increasing efficiency of equipment work for preliminary separation of non-ferrous metals
Authors: Potapov V.Ya. , Afanasyev A.I. , Potapov V.V. , Stozhkov D.S. , Chirkova A.A.
Published: July 2020

The article provides an overview of the methods for pre-sorting sulfide ores, as well as the design of separators for implementing these methods. The practical prospects of the use of radioresonance and X-ray fluorescence separation for the preliminary preparation of sulfide ores are shown. The use of not one, but two or more different physical properties of the separated ore components during radiometric beneficiation opens up additional possibilities in increasing the selectivity of this process and expanding the scope of its application. It is proposed to reduce the energy intensity of crushing processes, due to the impact on the rock electrical breakdown of ore in order to reduce its strength. In this case, the processes of crushing and grinding are replaced by processes of selective destruction along the boundaries of inclusions of the useful component. The substantiation of the technology for the separation of poor copper-zinc ores is presented. The relationship of sulfide content and electrical breakdown voltage is shown.The results of experiments in determination the specific energy consumption for the electrical processing of lean ore, depending on the sulfide content, are presented. The principle is substantiated, and a simulation model of the separation process is developed. The block diagram of the separation process algorithm is given.A description of the methodology for working with software is done. The energy costs of a new technology for the separation of poor sulfide ores are determined.
Assessment of the Need to Create Control Sytem of Unmanned Dump Truck
Authors: Dubinkin Dmitry , Sadovets Vladimir , Syrkin Ilya , Chicherin Ivan
Published: July 2020

The paper substantiates the need to create an autonomous dump truck control system. The scope of the unmanned mining dump truck is described. An example of the layout of the general scheme of an autonomous dump truck with control system basic elements is given, as well as some differences from the dump trucks with traditional control system are presented. The levels of automation of autonomous dump truck are formed. The enlarged tasks that need to be addressed when creating a control system for autonomous mining dump truck are highlighted. The general structure of a multi-level control system for autonomous dump truck was developed. The upper, middle and lower levels of the control system are described. The summation is drawn on the relevance of developing scientifically based approaches for creating control systems for autonomous mining truck, as well as developing mathematical models and algorithms for controlling autonomous mining trucks. The main directions for further research are identified. They are the development of requirements for a dump truck control system; the development of the structure of mathematical models and algorithms for the operation of subsystems of the dump truck control; the development of software that allows simulating the interaction of the subsystems of the dump truck control system with each other, the Smart Quarry system and the operator.
Cadastral valuation of lands dedicated to perennial plantings: features and practice
Authors: Zhichkin Kirill , Nosov Vladimir , Lakomiak Aleksandra , Zhichkina Lyudmila
Published: July 2020

The article considers the issue of cadastral valuation of agricultural lands used for perennial plantations (orchards). Unlike other agricultural crops, orchard crops occupy the land for a long period of time, therefore, the planting expenditures are capital. The purpose of the study is to define the features and adapt the existing methodology for cadastral valuation of lands occupied by orchards considering the actual return on the evaluated land plot and the distance factor that affects the increase in cost and decline in return depending on the location of the plot in relation to the main markets. The example (plots are located in the Bezenchugsky district of the Samara region) shows that the costs of orchard plots are 2.73 and 2.93 rubles per square meter, respectively. Quality characteristics of the first plot are better, but it is located further from the centre of the region.
Criteria for sustainable development in mining industry
Authors: Ignatyeva Margarita , Kosolapov Oleg , Yurak Vera , Ivanov Andrey
Published: July 2020

The article considers the problem of improving the transition to sustainable development in the conditions of the economy with environmental priorities. The study’s aim is to substantiate the criteria for sustainable development in the development of resources that are consistent with the criteria stipulated by the concept of sustainable development and reflect the specific features of production activities within the framework of life cycle stages of a mining enterprise. The necessity of changing the existing vector of development is confirmed, which presumes the preservation of natural capital as far as possible while meeting the vital needs of the population. The paper offers the list of criteria for the development of subsoil resources, interrelated with the pre-production and production phases of the life cycle. At the pre-production stage, an assessment of the coordination criterion of the predicted technogenic load and assimilation capacity of the territory is required. At the stages of the production phase, it is necessary to slow down the depletion of mineral resources due to the completeness of mining reserves while increasing the reliability of geological information, improving the rationing of losses and dilution, as well as the socio-economic approach to the justification of operational conditions. The criterion regarding minimizing waste generation and maximizing their use in the context of a circular economy also requires compliance; the third criterion demands the timeliness and completeness of disturbed lands’ restoration.
Modern approaches to conduct the in-process control at high-risk mining enterprises
Authors: Khairullina Larisa , Starikova Galina , Bulgakova Elena , Mamaeva Natali , Nordman Irina
Published: July 2020

The low level of the in-process control at mining enterprises is one of the main reasons for the high accident rate, injuries and occupational illness. The article discusses modern approaches to conduct the in-process control at high-risk mining enterprises, which allow reflecting an objective assessment and analysis of the factory world; offer optimal solutions to emerging problems; determine the current level of factory management and reduce the level of accidents and injuries.
On the complexity measures of mutation hotspots in human TP53 protein
Authors: Ding Yan , Xue Hongsheng , Ding Xinjia , Zhao Yuqing , Zhao Zhilong , Wang Dazhi , Wu Jianlin
Published: July 2020

The role of sequence complexity in 23 051 somatic missense mutations including 73 well-known mutation hotspots across 22 major cancers was studied in human TP53 proteins. A role for sequence complexity in TP53 protein mutations is suggested since (i) the mutation rate significantly increases in low amino acid pair bias complexity; (ii) probability distribution complexity increases following single point substitution mutations and strikingly increases after mutation at the mutation hotspots including six detectable hotspot mutations (R175, G245, R248, R249, R273, and R282); and (iii) the degree of increase in distribution complexity is significantly correlated with the frequency of missense mutations (r = −0.5758, P < 0.0001) across 20 major types of solid tumors. These results are consistent with the hypothesis that amino acid pair bias and distribution probability may be used as novel measures for protein sequence complexity, and the degree of complexity is related to its susceptibility to mutation, as such, it may be used as a predictor for modeling protein mutations in human cancers.
A-site engineered lead halide perovskites lead to balanced stability and efficiency
Authors: Mandel Savannah
Published: July 2020

Low toxicity, increased stability and a path toward perovskite commercialization are highlighted in perspective on A-site engineered lead halide perovskites.
Pathways for charge transport through material interfaces
Authors: Tovi Yanay , Caspary Toroker Maytal
Published: July 2020

Modeling charge transport across material interfaces is important for understanding the limitations of electronic devices such as transistors, electrochemical cells, sensors, and batteries. However, modeling the entire structure and full dimensionality of an interface can be computationally demanding. In this study, we investigate the validity of an efficient reduced one-dimensional Hamiltonian for calculating charge transport along interfaces by comparing to a two-dimensional model that accounts for additional charge transport pathways. We find that the one-dimensional model successfully predicts the qualitative trend of charge transmission probability among Pt/Fe2O3 and Ag/Fe2O3 interfaces. However, the two-dimensional model provides additional information on possible pathways that are not perpendicular to the interface direction. These charge transport pathways are directed along the lowest potential energy profile of the interface that correlates with the crystal structure of the constituting materials. However, the two-dimensional paths are longer and take more scattering time. Therefore, the one-dimensional model may hold sufficient information for qualitative estimation of charge transport through some material interfaces.
Structure and good piezoelectric performance in the complex system of Pb[(Zn,Ni)Nb]O3–Pb[(In,Yb)Nb]O3–Pb(Zr,Hf,Ti)O3
Authors: Zhang Jianbo , Liu Hui , Sun Shengdong , Liu Ye , Gao Botao , Deng Shiqing , Fan Longlong , Chen Jun
Published: July 2020

High-performance piezoelectrics are always demanded for the high-end application. Herein, a complex piezoelectric system of 0.49Pb(Zn1/2Ni1/2)1/3Nb2/3O3–xPb(In1/2Yb1/2)1/2Nb1/2O3–(0.51 − x)Pb(Zr1/2Hf1/2)0.1Ti0.9O3 (0.16 ≤ x ≤ 0.23) was fabricated through the solid-state method. The structure, ferroelectric, piezoelectric, and dielectric properties were investigated. The optimum piezoelectric coefficient d33 of 761 pC/N, high Curie temperature of 169 °C, dielectric permittivity (ɛr) of 4557, and electromechanical coupling coefficient (kp) of 63% were found at the morphotropic phase boundary composition of x = 0.19, which are superior to other complex piezoelectric materials. In particular, a significant large-signal d33∗ of 913 pm/V and low strain hysteresis (6%) was obtained in the temperature range of 20–170 °C. Temperature-dependent x-ray diffraction (XRD) has demonstrated that good temperature stability is put down to the structure stability. The agreement between the calculated lattice strain from in situ high-energy synchrotron XRD data and the macroscopic measurements suggests that the large lattice strain has a dominant contribution to the high piezoelectric response. The high piezoelectric performance and good temperature stability makes it potential for application.
Polarization-insensitive terahertz spoof localized surface plasmon-induced transparency based on lattice rotational symmetry
Authors: Zhao Zhenyu , Zhao Hui , Ako Rajour Tanyi , Nickl Simon , Sriram Sharath
Published: July 2020

In recent years, metasurfaces enabling a slow light effect in the terahertz band have seen considerable achievement. However, most of these advances demonstrated so far are polarization sensitive. In this work, we demonstrate polarization-insensitive terahertz slow light at spoof surface plasmon-induced transparency windows. Two types of metasurfaces based on different lattice layouts, a C2 and a C4 lattice symmetry, are compared. On the one hand, the metasurface with C2 lattice symmetry displayed a 5 ps slow light effect in a transparency window around 0.3 THz. On the other hand, the metasurface with a C4 lattice layout achieves a maximum of 28 ps slow light at 0.3 THz. The coupling coefficient and the damping ratio in the transparency window in the metasurface with C4 lattice symmetry are 5 times higher than in the metasurface with C2 lattice layout. Two eigenmode mode constructive interference introduces a positive group delay in the transparency window in the metasurface with C4 lattice symmetry, whereas the superposition of two eigenmodes in the metasurface with C2 lattice symmetry forms the transparency window without distinct coupling. Our results show that the point group symmetry or lattice structure of a metasurface has a huge impact on the group velocity of terahertz pulses and therefore introduces flexibility in the design of polarization-insensitive slow light devices for terahertz telecommunication application.
Rheology of a dilute suspension of deformable microswimmers
Authors: Matsui Hitomu , Omori Toshihiro , Ishikawa Takuji
Published: July 2020

Suspensions of swimming microorganisms play important roles in biology, medicine, and engineering. To predict and control the flow field of such suspensions, an understanding of their rheological properties is required. In this background, the suspension rheology of various types of microorganisms has been investigated intensively. Research has shown that some microorganisms, such as ciliates, deform when a strong force is exerted on their bodies. However, the effect of cell deformability on suspension rheology has not yet been clarified. In this study, we used a deformable torque swimmer, as a model ciliate, to investigate the rheological properties of a dilute suspension under shear flow. Our results show that the model swimmer tends to gradually change its orientation toward the shear plane or vorticity axis. Regardless of the swimming mode, the apparent shear viscosity shows shear-thinning properties, with the first normal stress difference being positive in sign. The second normal stress difference can be positive or negative, depending on the swimming mode, the deformability, and the shear rate. The mechanism to show such rheological properties can be understood based on the deformed shape and direction of the swimmer’s stresslet. These findings are important for understanding the suspension rheology of natural microorganisms and artificial deformable swimmers, which is essential to predict and control the flow of these suspensions.
Modeling the effect of mechanical stress on bipolar degradation in 4H-SiC power devices
Authors: Sakakima Hiroki , Goryu Akihiro , Kano Akira , Hatano Asuka , Hirohata Kenji , Izumi Satoshi
Published: July 2020

Bipolar degradation, which is caused by the expansion of stacking faults (SFs) during operation, has been a serious issue in 4H-SiC power devices. To evaluate the threshold minority carrier density of SF expansion, ρth, Maeda et al. proposed a theoretical model based on quantum well action and dislocation theory. This model includes SF energy variations, electronic energy lowering due to carrier trapping, and resolved shear stress applied to partial dislocations, τrss. Though the SF energy and the electric energy lowering were quantitatively established, the effect of τrss has not been discussed well yet. In this study, we first conducted theoretical predictions of the effect of τrssonρth. Then, based on our previous experiment on the dependence of threshold current density on mechanical external stress, we investigated the dependence of ρthonτrss. We conducted submodeling finite element analysis to obtain τrss induced by both residual stress due to the fabrication process and experimentally applied external stress. Finally, we obtained ρth at the origin of SF expansion from the experimentally measured threshold current density using device simulation. It was found that the dependence of ρthonτrss was almost linear. Its gradient was −0.04 ± 0.01 × 1016 cm−3/MPa, which well agrees with the theoretical prediction of −0.03 ± 0.02 × 1016 cm−3/MPa. Our study makes possible a comprehensive evaluation of the critical condition of bipolar degradation.
Two-dimensional mechanical metamaterials with bending-induced expansion behavior
Authors: Li Xiang , Fan Zhengjie , Fan Rong , Lu Yang
Published: July 2020

A conventional thin homogeneous elastic plate shows no net lateral strain when subjected to a pure bending load. Here, a two-dimensional (2D) metamaterial exhibiting an exotic bending-induced expansion behavior is designed based on the structure unit with a non-symmetric contact under tensile and compressive loads. Expansion behavior was demonstrated in the fabricated 2D metamaterial structures in four-point bending, tension, and compression tests and corresponding simulations. The bending-expansion ratio, defined as the lateral strain times the curvature radius divided by the length of the unit cell, is a non-dimensional parameter depending on the geometry of the structure.
Effect of Reynolds number on turbulent channel flow over a superhydrophobic surface
Authors: Abu Rowin Wagih , Ghaemi Sina
Published: July 2020

The slip boundary and the near-wall statistics of a fully developed turbulent channel flow over a superhydrophobic surface (SHS) was investigated in a low Reynolds number (Re) range. The Re was varied from 6200 to 9400, based on the bulk velocity and the full-channel height. The root-mean-square of the surface roughness, normalized by the inner flow scaling, varied from 0.26 to 0.35 with increasing Re. Time-resolved, two-dimensional particle tracking velocimetry (PTV) was used to obtain the mean velocity profile in the linear viscous sublayer. Furthermore, time-resolved three-dimensional PTV was applied to obtain the Reynolds stresses. The estimated wall shear stress showed that the drag reduction of the SHS increased slightly from 37% to 42% when Re increased. With increasing Re, the slip velocity increased linearly from 0.25 m/s to 0.34 m/s, and the slip length reduced from 97.5 μm to 69.6 µm. When normalized using inner scaling, slip velocity and length remained constant with increasing Re. The mean velocity of the SHS demonstrated a log-law with the universal von Kármán constant but shifted upward by an amount equal to the normalized slip velocity. The SHS increased the dimensional Reynolds stresses in the near-wall region and attenuated them farther away from the wall. With increasing Re, the differences between the dimensional Reynolds stresses of the smooth surface and the SHS increased. However, when Reynolds stresses were normalized using friction velocity, the Reynolds stresses of the SHS overlapped for all the investigated Re and were larger than the normalized Reynolds stresses of the smooth surface.
Facile and quantitative estimation of strain in nanobubbles with arbitrary symmetry in 2D semiconductors verified using hyperspectral nano-optical imaging
Authors: Darlington Thomas P. , Krayev Andrey , Venkatesh Vishal , Saxena Ravindra , Kysar Jeffrey W. , Borys Nicholas J. , Jariwala Deep , Schuck P. James
Published: July 2020

When layers of van der Waals materials are deposited via exfoliation or viscoelastic stamping, nanobubbles are sometimes created from aggregated trapped fluids. Though they can be considered a nuisance, nanobubbles have attracted scientific interest in their own right owing to their ability to generate large in-plane strain gradients that lead to rich optoelectronic phenomena, especially in the semiconducting transition metal dichalcogenides. Determination of the strain within the nanobubbles, which is crucial to understanding these effects, can be approximated using elasticity theory. However, the Föppl–von Kármán equations that describe strain in a distorted thin plate are highly nonlinear and often necessitate assuming circular symmetry to achieve an analytical solution. Here, we present an easily implemented numerical method to solve for strain tensors of nanobubbles with arbitrary symmetry in 2D crystals. The method only requires topographic information from atomic force microscopy and the Poisson ratio of the 2D material. We verify that this method reproduces the strain for circularly symmetric nanobubbles that have known analytical solutions. Finally, we use the method to reproduce the Grüneisen parameter of the E′ mode for 1L-WS2 nanobubbles on template-stripped Au by comparing the derived strain with measured Raman shifts from tip-enhanced Raman spectroscopy, demonstrating the utility of our method for estimating localized strain in 2D crystals.