bluuebunny/crossref_metadata_2025 huggingface dataset:
Structures, dipole moments and excited state lifetime of isolated 4-cyanoindole in its ground and lowest electronically excited singlet states
Authors: Hebestreit Marie-Luise , Schneider Michael , Lartian Hilda , Betz Vivienne , Heinrich Michael , Lindic Mirko , Choi Myong Yong , Schmitt Michael
Published: June 2019

The rotationally resolved electronic Stark spectrum of 4-cyanoindole and some N-D and C-D deuterated isotopologues has been measured and analyzed.
Probing effects of molecular conformation on the electronic and charge transport properties in two- and three-dimensional small molecule hole-transporting materials: a theoretical investigation
Authors: Sun Zhu-Zhu , Feng Shuai , Gu Chuantao , Cheng Nian , Liu Jiangfeng
Published: June 2019

A series of small molecule HTMs with two-dimensional and three-dimensional cores is simulated and the results show that the three-dimensional cores exhibit superiorities in comparison with the two-dimensional cores.
Elucidating the mechanism and kinetics of the water-assisted reaction of nitrous acid with hydroxyl radical
Authors: Tang Shanshan , Tsona Narcisse T. , Du Lin
Published: June 2019

The rate constant of the HONO + OH reaction is slightly increased by hydration.
Total surface area in indoor environments
Authors: Manuja Archit , Ritchie Jenna , Buch Khantil , Wu Yaoxing , Eichler Clara M. A. , Little John C. , Marr Linsey C.
Published: June 2019

Objects in a room add 50% to its surface area beyond the walls, ceiling, and floor.
Emerging investigator series: spatial distribution of dissolved organic matter in ice and at air–ice interfaces
Authors: Chakraborty Subha , Kahan Tara F.
Published: June 2019

Organic solutes in snow and ice can be distributed heterogeneously throughout the ice bulk and across the ice surface. This may affect air-surface interactions and heterogeneous reactions in snow-covered regions.
A pilot-scale study of peracetic acid and ultraviolet light for wastewater disinfection
Authors: Hassaballah Abdulrahman H. , Nyitrai Jeremy , Hart Christine H. , Dai Ning , Sassoubre Lauren M.
Published: June 2019

At the pilot-scale, peracetic acid effectively inactivates fecal coliforms,E. coliandEnterococcusspp. in secondary and tertiary treated wastewater. The addition of UV to PAA treatment increases inactivation of somatic coliphage.
Oleic acid as a protein ligand improving intestinal absorption and ocular benefit of fucoxanthin in water through protein-based encapsulation
Authors: Liu Yixiang , Qiao Zichun , Liu Wenqiang , Hou Zhanqun , Zhang Di , Huang Ling , Zhang Yaping
Published: June 2019

The oleic acid–protein delivery system can improve both the dispersibility and intestinal absorption of fucoxanthin in a hydrophilic environment.
Engineering surface states of hematite based photoanodes for boosting photoelectrochemical water splitting
Authors: Tang PengYi , Arbiol Jordi
Published: June 2019

A critical review on how engineering surface states of hematite-based photoanodes can enhance the photoelectrochemical water splitting performance.
Window screen inspired fibrous materials with anisotropic thickness gradients for improving light transmittance
Authors: Pan Nan , Qin Juanrong , Feng Pingping , Song Botao
Published: June 2019

Ultrafine fibers were assembled into an anisotropic architecture for improving light transmittance.
Chemically synthesized anisotropic SmCo5 nanomagnets with a large energy product
Authors: Ma Zhenhui , Liang Jingming , Ma Wen , Cong Liying , Wu Qiong , Yue Ming
Published: June 2019

In this communication, we report a facile strategy to chemically synthesize anisotropic SmCo5 nanomagnets with a large magnetic energy product (BH).
Combining the qualities of carbazole and tetraphenyl silane in a desirable main chain for thermally activated delayed fluorescence polymers
Authors: Zhou Xiang , Huang Manli , Zeng Xuan , Chen Tianheng , Xie Guohua , Yin Xiaojun , Yang Chuluo
Published: June 2019

A series of green TADF polymers with carbazole and a tetraphenyl silane copolymer main chain were developed for use in non-doped solution processed OLEDs.
Zinc porphyrin–polydopamine core–shell nanostructures for enhanced photodynamic/photothermal cancer therapy
Authors: Ou Changjin , Zhang Yewei , Pan Dong , Ding Kaikai , Zhang Shichao , Xu Wenjing , Wang Wenjun , Si Weili , Yang Zhou , Dong Xiaochen
Published: June 2019

Zinc porphyrin–polydopamine core–shell nanostructures were constructed for cancer photodynamic/photothermal synergistic therapy.
A 2D/2D graphitic carbon nitride/N-doped graphene hybrid as an effective polysulfide mediator in lithium–sulfur batteries
Authors: Ma Junsheng , Yu Mingpeng , Ye Huanyu , Song Hongquan , Wang Dongxue , Zhao Yanting , Gong Wei , Qiu Hong
Published: June 2019

A heterostructured host composed of porous g-C3N4 and N-doped graphene was fabricated by a template-free strategy. The hybrid display excellent cyclability and high coulombic efficiency due to the enhanced polysulfide anchoring-conversion capability.
Revelation solvent effects: excited state hydrogen bond and proton transfer of 2-(benzo[d]thiazol-2-yl)-3-methoxynaphthalen-1-ol
Authors: Li Yongqing , Zhao Yu , Yang Yunfan , Shi Wei , Fan Xiaoxing
Published: June 2019

ESIPT reaction of an MMT molecule is gradually inhibited with increasing solvent polarity.
Efficient and sustainable laccase-catalyzed iodination ofp-substituted phenols using KI as iodine source and aerial O2as oxidant
Authors: Sdahl Mark , Conrad Jürgen , Braunberger Christina , Beifuss Uwe
Published: June 2019

A new and sustainable laccase-catalyzed iodination ofp-substituted phenols using KI as iodine source and aerial O2as oxidant has been developed.
Solvent-free electrically conductive Ag/ethylene vinyl acetate (EVA) composites for paper-based printable electronics
Authors: Shen Yuqiu , Chen Zhenxing , Zhou Yong , Lei Zuomin , Liu Yi , Feng Wenchao , Zhang Zhuo , Chen Houfu
Published: June 2019

A novel type of solvent-free electrically conductive Ag/EVA composite for paper-based printable electronics was prepared through a thermal melting method.
Transport properties of electron small polarons in a V2O5 cathode of Li-ion batteries: a computational study
Authors: Watthaisong Panuwat , Jungthawan Sirichok , Hirunsit Pussana , Suthirakun Suwit
Published: June 2019

Mechanisms and properties of the electron transport at the V2O5 cathode of Li-ion batteries were studied by means of first-principles computations.
Effect of poly-methyltriethoxysilane on the waterproof property of starch/fiber composites with open cell structures
Authors: Sun Xu , Jia Xiu-jie , Li Fang-yi , Li Jian-feng , Li Jian-yong , Zhang Chuan-wei , Chen Shuai , Cui Jin-feng , Sun Kai-qiang , Zhang Shan-guo
Published: June 2019

Novel starch/fiber composites with open cell structures were proposed through thermo-cavity molding.
Laser-treated glass platform for rapid wicking-driven transport and particle separation in bio microfluidics
Authors: Jiang Hongjie , Ochoa Manuel , Rahimi Rahim , Yu Wuyang , Ziaie Babak
Published: June 2019

In this work, we present a laser-based fabrication technique for direct patterning of micro-channels consisting of interconnected micro-cracks on soda-lime glass.
Orientational structures in cholesteric droplets with homeotropic surface anchoring
Authors: Krakhalev Mikhail N. , Rudyak Vladimir Yu. , Prishchepa Oxana O. , Gardymova Anna P. , Emelyanenko Alexander V. , Liu Jui-Hsiang , Zyryanov Victor Ya.
Published: June 2019

The dependency of orientational structures in cholesteric droplets with homeotropic surface anchoring on the helicity parameter has been studied by experiment and simulations.
The role of deformability in determining the structural and mechanical properties of bubbles and emulsions
Authors: Boromand Arman , Signoriello Alexandra , Lowensohn Janna , Orellana Carlos S. , Weeks Eric R. , Ye Fangfu , Shattuck Mark D. , O'Hern Corey S.
Published: June 2019

We perform computational studies of jammed particle packings in two dimensions undergoing isotropic compression using the well-characterized soft particle (SP) model and deformable particle (DP) model that we developed for bubbles and emulsions.
Construction of highly dispersed mesoporous bimetallic-sulfide nanoparticles locked in N-doped graphitic carbon nanosheets for high energy density hybrid flexible pseudocapacitors
Authors: Javed Muhammad Sufyan , Lei Hang , Li Jinliang , Wang Zilong , Mai Wenjie
Published: June 2019

The as-fabricated ZCS//MPC-ASC device delivered the ultrahigh energy density of 92.59 W h kg−1 at the power density of 846.02 W kg−1 with high flexibility.
Functional MoS2nanosheets inhibit melanogenesis to enhance UVB/X-ray induced damage
Authors: Jiang Ling , Xu Yanyan , Zhang Pei , Zhang Yi , Li Huimin , Chen Jing , Liu Song , Zeng Qinghai
Published: June 2019

We produced highly dispersed MoS2nanosheets in water with the assistance of tryptophan (Trp) to inhibit melanogenesis by suppressing ROS production.
Bacteria-induced aggregation of bioorthogonal gold nanoparticles for SERS imaging and enhanced photothermal ablation of Gram-positive bacteria
Authors: Wang Huijie , Ouyang Wenwen , Zhang Xuerui , Xue Jing , Lou Xiaoran , Fan Ranran , Zhao Xiaonai , Shan Lianqi , Jiang Tingting
Published: June 2019

A theranostic strategy based on biorthogonal cycloaddition was designed to form GNP aggregates, enabling bacterial SERS imaging and photothermal therapy.
Zinc phthalocyanine activated by conventional indoor light makes a highly efficient antimicrobial material from regular cellulose
Authors: Grammatikova Natalia E. , George Lijo , Ahmed Zafar , Candeias Nuno R. , Durandin Nikita A. , Efimov Alexander
Published: June 2019

A phthalocyanine-cellulose material quickly inactivates drug-resistant microbes under indoor light.
Boosting the external quantum efficiency in perovskite light-emitting diodes by an exciton retrieving layer
Authors: Gao Chunhong , Xiong Ziyang , He Ziqian , Dong Yajie , Yu Fuxing , Ma Xingjuan , Zhang Yue , Zhou Dongying , Xiong Zuhong
Published: June 2019

High-efficiency perovskite LEDs fabricated by introducing an exciton retrieving layer are demonstrated. The optimized 3D CsPbBr3 LEDs achieved 2.5-fold luminance and 3.8-fold EQE enhancements compared with the control devices.
Monitoring fluorescent calcium signals in neural cells with organic photodetectors
Authors: Rezaei-Mazinani Shahab , Ivanov Anton I. , Biele Markus , Rutz Alexandra L. , Gregoriou Vasilis G. , Avgeropoulos Apostolos , Tedde Sandro Francesco , Chochos Christos L. , Bernard Christophe , O’Connor Rodney P. , Malliaras George G. , Ismailova Esma
Published: June 2019

We demonstrate the use of organic photodetectors for monitoring fluorescent calcium signals as a measure of functional aspects of neural circuits, in vitro and ex vivo.
Ovarian cancer-derived exosomes promote tumour metastasisin vivo: an effect modulated by the invasiveness capacity of their originating cells
Authors: Alharbi Mona , Lai Andrew , Guanzon Dominic , Palma Carlos , Zuñiga Felipe , Perrin Lewis , He Yaowu , Hooper John D. , Salomon Carlos
Published: June 2019

Exosomes are small nanovesicles that carry bioactive molecules which can be delivered to neighbouring cells to modify their biological functions. Studies have showed that exosomes from ovarian cancer (OVCA) cells can alter the cell migration and proliferation of cells within the tumour microenvironment, an effect modulated by the invasiveness capacity of their originating cells. Using an OVCA cell line xenograph mouse model, we showed that exosomes derived from a high invasiveness capacity cell line (exo-SKOV-3) promoted metastasis in vivo compared with exosomes from a low invasiveness capacity cell line (exo-OVCAR-3). Analysis from anin vivo imaging system (IVIS) revealed that exo-SKOV-3 formed metastatic niches, whereas exo-OVCAR-3 formed colonies of clustered cells close to the site of injection. Interestingly, kinetic parameters showed that the half-maximal stimulatory time (ST50) of tumour growth with exo-OVCAR-3 (4.0 ± 0.31 weeks) was significantly lower compared with the ST50 in mice injected with exo-SKOV-3 (4.5 ± 0.32 weeks). However, the number of metastic nodes in mice injected with exo-SKOV-3 was higher compared with exo-OVCAR-3. Using a quantitative mass spectrometry approach (SWATH MS/MS) followed by bioinformatics analysis using the Ingenuity Pathway Analysis (IPA), we identified a total of 771 proteins. Furthermore, 40 of these proteins were differentially expressed in tumour tissues from mice injected with exo-SKOV-3 compared with exo-OVCAR-3, and associated with Wnt canonical pathway (β-catenin). Finally, we identified a set of proteins which had elevated expression in the circulating exosomes in association with tumour metastasis. These observations suggest that exosomal signalling plays an important role in OVCA metastasis.
Event‐triggered distributed fault detection over sensor networks in finite‐frequency domain
Authors: Ju Yamei , Wei Guoliang , Ding Derui , Liu Shuai
Published: June 2019

In this study, the event‐triggered distributed fault detection problem is investigated for a class of discrete‐time uncertain systems in the finite frequency domain. A sensor network is utilised to collect the information of interest, and an event‐triggered communication scheme is adopted to alleviate the communication burden. For the addressed problem, a distributed fault detection filter is designed based on the measurement information from its neighbouring nodes and itself by the given topology. In addition, a fashionable index, named as performance, is employed in order to simultaneously achieve the residual sensitivity to faults and the robustness against disturbances. By resorting to Euler's formula combined with Lyapunov stability theory, some sufficient conditions are established to satisfy the desired performance over a given finite‐frequency domain, and the distributed fault detection filter gains are explicitly characterised by solving a series of linear matrix inequalities. A simulation example is conducted to illustrate the feasibility of the proposed filter design technique.
Rotor angle stability control for DFIG‐integrated power system considering phase‐amplitude characteristics of transient‐grid voltage
Authors: Zheng Di , Ouyang Jinxin , Xiong Xiaofu , Li Mengyang
Published: June 2019

The rotor angle stability of power systems under the influence of doubly fed induction generator (DFIG)‐based wind turbines has elicited increasing attention as the penetration of wind power increases. The flexible and controllable power capability of DFIG makes it feasible to improve the stability performance of power systems. However, the effects of DFIG on rotor angle stability are not accurate because the phase angle variation of grid voltage has not been considered in existing studies. Current stability control methods may not be effective. This study proposes a rotor angle stability control method considering phase‐amplitude characteristics of transient‐grid voltage. Variations in both amplitude and phase angle of grid voltage are considered to analyse the effect of DFIG on the rotor angle stability of the DFIG‐integrated power system. An evaluation index, which represents the accelerating area variation of the synchronous generator (SGs), is defined to quantise the effect of DFIG. In addition, the controllable power region of DFIG is established by considering DFIG's power constraints and effects on system stability. The control method of rotor angle stability is proposed based on the controllable power region and the evaluation index. Simulation results verify that the effectiveness of proposed method.
Gate driver IC for enhancement mode GaN power transistors with senseFET reverse conduction detection circuit
Authors: Zhang Wei Jia , Leng Yahui , Yu Jingshu , Jiang Xiaoxue , Cheng ChuYao , Ng Wai Tung
Published: June 2019

Dead‐times are necessary in switching output stage to avoid shoot‐through current between the high side (HS) and the low side (LS) power transistors. However, excessively long dead‐times can lead to unwanted reverse conduction and power loss. Sensing the duration of reverse conductions are especially difficult for high‐voltage enhancement mode (e‐mode) gallium nitride (GaN) HEMTs due to their fast switching speed. High‐precision sensing circuits are required for dead‐time correction as the load current changes and to withstand large voltage swings. Traditional CMOS‐based sensing circuits (e.g. standard logic gates) are not suitable for GaN‐based converters as they can only handle limited voltage ranges. In addition, severe undershoots (up to −4 V) may damage the sensing circuit. Here, a gate driver IC for e‐mode GaN power output stages capable of detecting the presence of reverse conduction with a best resolution of 0.66 ns, a dead‐time adjustment resolution of 0.33 ns, and with on‐chip closed‐loop control is presented. In addition, a novel reverse conduction sensing circuit that can accommodate the large voltage swings at the switching node (SW) is also described.
Titanium‐based nanoscale cross‐linker for guar gum fracturing fluid: effects on rheological behaviour and proppant‐carrying ability
Authors: Wang Chunnan , Zhang Zifeng , Du Jing , Li Xiaohong , Zhao Mengyun , Zhang Zhijun
Published: June 2019

Ti4+ was introduced onto the surface of 3‐aminopropyltriethoxysilane (denoted as APTS; a silane coupling agent; commercial name: KH550) by surface‐modification technology to afford a precursor of nanoscale cross‐linker. The as‐obtained precursor of nanoscale cross‐linker was further transformed to a Ti‐based nanoscale cross‐linker (denoted as Ti‐NC) by hydrolysis and condensation in association with self‐aggregation. The microstructure of the Ti‐NC crosslinking guar gum gel was characterised by field emission scanning electron microscopy. Moreover, the effects of the as‐prepared Ti‐NC on the thermal stability, rheological behaviour, and proppant‐carrying ability of guar gum fracturing fluid were investigated with boric acid and TiCl4 as the controls. Results indicate that the as‐prepared Ti‐NC has a sphere‐like shape and a size of 6–13 nm. In the meantime, the guar gum gel cross‐linked by Ti‐NC exhibits better thermal stability, rheological behaviour, and proppant‐carrying ability than the ones cross‐linked by TiCl4 or boric acid, which indicates that the as‐prepared Ti‐NC could find promising application in enhancing the oil recovery of the low‐permeability reservoir. This is because Ti‐NC contributes to enhancing the inter‐molecular cross‐linking rather than intra‐molecular cross‐linking of guar gum molecular chains and yielding a tight three‐dimensional network structure in the cross‐linked guar gum gel.
Si/SiC heterojunction lateral double‐diffused metal oxide semiconductor field effect transistor with breakdown point transfer (BPT) terminal technology
Authors: Duan Baoxing , Huang Yunjia , Xing Jingyu , Yang Yintang
Published: June 2019

A novel silicon (Si) on silicon carbide (SiC) lateral double‐diffused metal oxide semiconductor field effect transistor with deep drain region is proposed. Its main idea is transferring the breakdown point and utilising the high critical electric field of SiC material to suppress the curvature effect of the drain, which eventually alleviates the trade‐off relationship between breakdown voltage (BV) and specific on‐resistance (Ron,sp). Through the TCAD simulation, the results show that the BV is significantly improved from 240 V for conventional Si lateral double‐diffused metal oxide semiconductor (LDMOS) to 384 V for the proposed structure with the drift region length of 20 μm, increased by 60%. The figure‐of‐merit of the conventional Si LDMOS and the Si/SiC LDMOS are 2.04 and 4.26 MW/cm2, respectively. It indicates that the proposed structure has better performance than the Si counterpart. The influences of design parameters and interfacial charges on the device performance are also discussed in this work.
Flying far and fast: the distribution of distant hypervelocity star candidates fromGaiaDR2 data
Authors: de la Fuente Marcos R. , de la Fuente Marcos C.
Published: June 2019

Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000 km s−1. These can be easily induced at the centres of galaxies via close encounters between binary stars and supermassive black holes; however, a number of other mechanisms operating elsewhere can produce them as well.

Aims. Recent studies suggest that hypervelocity stars are ubiquitous in the local Universe. In the Milky Way, the known hypervelocity stars are anisotropically distributed, but it is unclear why. Here, we usedGaiaData Release 2 (DR2) data to perform a systematic exploration aimed at confirming or refuting these findings.

Methods. Our basic premise is that the farther the candidate hypervelocity stars are, the more likely they are to be unbound from the Galaxy. We used the statistical analysis of both the spatial distribution and kinematics of these objects to achieve our goals. Monte Carlo sampling techniques were applied to deal with large uncertainties. No global parallax zero-point correction was performed.

Results. Focussing on nominal Galactocentric distances greater than 30 kpc, which are the most distant candidates, we isolated a sample with speeds in excess of 500 km s−1that exhibits a certain degree of anisotropy but remains compatible with possible systematic effects. We find that the effect of the Eddington-Trumpler-Weaver bias is important in our case: over 80% of our sources are probably located further away than implied by their parallaxes; therefore, most of our velocity estimates are lower limits. If this bias is as strong as suggested here, the contamination by disc stars may not significantly affect our overall conclusions.

Conclusions. The subsample with the lowest uncertainties shows stronger, but obviously systematic, anisotropies and includes a number of candidates of possible extragalactic origin and young age with speeds of up to 2000 km s−1.
Hydrogen isotopic anomalies in extraterrestrial organic matter: role of cosmic ray irradiation and implications for UCAMMs
Authors: Augé B. , Dartois E. , Duprat J. , Engrand C. , Slodzian G. , Wu T. D. , Guerquin-Kern J. L. , Vermesse H. , Agnihotri A. N. , Boduch P. , Rothard H.
Published: June 2019

Context. Micrometeorites represent, at timescales shorter than a few million years, the dominant source of extraterrestrial matter at the surface of the Earth. Analyses of ultracarbonaceous micrometeorites recovered from Antarctica, known as UCAMMs reveal an exceptionally N-rich organic matter associated with spatially extended high D enrichments. Experiments show that this specific organic matter might have been formed in the outer solar system by energetic irradiation of N-rich icy surfaces.

Aims. We experimentally investigate the hydrogen isotopic fractionation resulting from irradiation of normal and D-rich N2-CH4 ices by high energy ions, simulating the exposition to Galactic cosmic rays of icy bodies surfaces orbiting at large heliocentric distances.

Methods. Films of N2-CH4 ices and a N2-CH4/CD4/N2-CH4 “sandwich” ice were exposed to 129Xe13+ ion beams at 92 and 88 MeV. The chemical evolution of the samples was monitored using in situ Fourier transform infrared spectroscopy. After irradiation, targets were annealed to room temperature. The solid residues of the whole process left after ice sublimation were characterized in situ by infrared spectroscopy, and the hydrogen isotopic composition measured ex situ by imaging secondary ion mass spectrometry at the sub-micron scale (NanoSIMS).

Results. Irradiation leads to the formation of new molecules and radicals. After annealing, the resulting poly-HCN-like macro-molecular residue exhibits an infrared spectrum close to that of UCAMMs. The residue resulting from irradiation of N2-CH4 ices does not exhibit a significant deuterium enrichment comparable to that found in extraterrestrial organic matter. The residue formed by irradiation of D-rich ices shows the formation of isotopic heterogeneities with localised hotspots and an extended contribution likely due to the diffusion of the radiolytic products from the D-rich layer.

Conclusions. These results show that high-energy cosmic ray irradiation does not induce the large hydrogen isotopic fractionation observed at small spatial scale in interplanetary organics. By contrast, large D/H ratio heterogeneities at the sub-micron spatial scale in extraterrestrial organic matter can result from isotopically heterogeneous ices mixtures (i.e. condensed with different D/H ratios), which were transformed into refractory organic matter upon irradiation.
Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contact
Authors: Shapovalov Vladimir , Shcherbak Petr , Kharlamov Pavel , Sajamova Tatiana , Ryabysh Denis
Published: June 2019

The analysis showed the following tendencies of development and energy efficiency of designs of gearboxes for track machines: provision of a maximum level of efficiency, removal of rupture of a stream of the passed capacity, provision of a high level of reliability, decrease of power input on gearbox work, provision of convenience, simplicity of service and steering, engine braking maintenance, and also maintenance of a relatively low cost. The above-mentioned tasks are performed by including clutch pinion gears with the built in frictional amplifier elements in an automatic gearbox, and also during the effect of dynamic anisotropy of frictional bonds. Besides a torque transfer, the clutch gear carries out a safety clutch function. That means that there is sliding at a high rotational power. Factor of strengthening of the given link is Кstr → ∞ due to occurence of dynamic anisotropy of frictional bonds. Physical and mechanical characteristics of contacting surfaces are formed in the course of dynamic interaction of roughnesses in friction units at modes of dry and boundary friction. Essential-nonlinear friction processes, interconnected with dynamic processes on the contact area, define values of target characteristics of frictional system. They can fluctuate in a very wide range. The friction factor fmp for the same friction units at preservation of constant conditions and friction parameters can vary from zero to infinity that is an essence of dynamic anisotropy of frictional bonds.
Modelling energy savings in chicken meat osmotic dehydration process
Authors: Filipović Vladimir , Petković Marko , Filipović Ivana , Filipović Jelena
Published: June 2019

Osmotic dehydration is a low energy demanding process, and in order to investigate and estimate the energy efficiency of the osmotic dehydration process, convective drying is taken as a base treatment for comparison. Obtained energy savings data of the osmodehydration process are used to develop mathematical models of the energy savings of the process. Results showed that maximal quantity of heat saved, indicated on high levels of energy efficiency of chicken meat osmodehydration process, while both technological parameters statistically significantly influenced process energy efficiency. The developed mathematical the model, allows good prediction of the quantity of heat saved based on applied technological parameters.
The energy efficiency of the process of metal cutting at the expense of the sustainability of the evolutionary trajectory of the cutting
Authors: Zakovorotny Vilor L. , Lapshin Viktor P. , Gvindjiliya Valery E. , Ahn Nguyen Dong
Published: June 2019

The problem of ensuring the sustainability of the processing process is directly related to the energy efficiency of the entire processing process. Virtually any machine the control of motion of which is considered interacts with the environment (technological, aerodynamic, trybologic, etc.). If one sticks to the synergetic analytical concept, the influence of the environment is described by a model of forces in state coordinates. The interaction is also characterized by the irreversible transformation capacity trajectory on the work. As a result, the system parameters are change causing additional strain displacements changing the trajectory. This transformation characterizes internal control and they are defined not by external action but by internal self-organization and defines the evolutionary trajectory. The properties of the system along the evolutionary trajectory change and the trajectory can lose its stability. The article considers the process of mathematical simulation of the evolutionary trajectory forming by the example of metalwork by cutting at turning machines and analyzes its stability. The evolution is presented as the parameters of the system depending on the capacity and work trajectory and presented by the Volterra integral equation of the second kind. When the trajectory loses its stability, irreversible changes can be formed in the system which may cause a complete system breakdown. In addition, the loss of stability leads to an increase in the oscillation amplitude of the tool and, as a consequence, an increase in energy costs for processing.
Research of the probability of the "flip" of approximating function during the processing of measurement results
Authors: Marchuk Vladimir , Chernyshov Dmitry , Sadrtdinov Ilya , Minaev Alexander
Published: June 2019

The paper presents the results of the studies of the probability of a “flip” of the approximating function when processing the measurement results under conditions of a priori uncertainty about the signal function and the statistical characteristics of additive noise. It is analytically proved that the confidence intervals of the probability of the absence and the presence of a “flip” are equal, which is confirmed by the experimental results. The dependences of the “flipping” of the approximating function on the sample length, the dispersion of additive noise and the rate of change of the function itself are obtained.
Intelligent Technologies in the Oil and Gas Industry
Authors: Milyushenko Sergey
Published: June 2019

The article is devoted to the discussion of improving the quality of oil and gas production, through the introduction of new technologies for the extraction and processing of natural resources. As well as to the procedure, which aims to ensure the increase in the volume of mineral resource (liquid hydrocarbons) and to optimization of production costs in modern enterprises of oil and gas industry. The development of “smart” technologies in the oil and gas industry is mainly associated with a reduction in proven oil and gas resources in the Russian Federation. However, there are oil and gas reserves in places with an unfavorable climate, which significantly increases the cost of developing such deposits. For solving this problem, the “smart” technology “Smart Field” development is proposed.
Numerical Simulation of Stress-Strain State of Thick Coal Seam at the End of Long-Pillar Work
Authors: Trofimov Vitaliy , Kubrin Sergey , Filippov Uriy , Haritonov Igor
Published: June 2019

The article deals with the redistribution of stresses and the formation of fracture regions at the final stage of the excavation post. Considered various options in the formulation of the problem, describe the solution in full and the additional stresses. Presented mechanical model describing the redistribution of the original stresses caused developing mining operations; formation of discharge zones and the additional load near the bottom of the lava and around the DC; areas of possible fall-outs of rocks; displacement of rocks, in particular faith-vertical in roof of recreation center and horizontal to vertical outcrops of in-fighting and dismantling the camera. The deformation model used in solving the problems is built taking into account the possible plastic deformation of both coal and the immediate roof of the formation, which allows taking into account both the fracture of the massif and the nonlinear deformation of the material itself. It is emphasized that the parameters of plasticity can be determined from the solution of the inverse problem using experimental data obtained in situ.
Perspectives for the Transportless Mining Technology in Siberia and Far East Coal Deposits
Authors: Markov Sergey , Janočko Juraj , Tyulenev Maxim , Litvin Yaroslav
Published: June 2019

In accordance with the long-term program for the coal industry development in Russia until 2030, the growth in the share of the Far East Federal District in the total coal production should be 2.5% compared to 2018. Production volumes in the Siberian Federal District to 2030 should reach 309.5 million tons. These numbers are planned to be achieved through the implementation of large-scale infrastructure projects for the development of new coal deposits with convenient mining and geological conditions, as well as the creation of new coal mining centres in Yakutia, Zabaykalsky region, Tyva Republic and other eastern regions of Russia. Taking into account the development of power generating facilities in Far East and Baikal region, coal consumption is planned to increase from 119 million tons in 2020 to 150 million tons per year in 2030. The realization of the planned indicators should be carried out taking into account the use of coal mining technologies that meet the mining and geological conditions of the deposits in this region. For a large number of coal fields in Eastern Siberia and Far East, transportless technology will be preferred.
Homogenization of Polymeric Flocculant Solutions Used for Purification of Slurry Waters After Coal Preparation
Authors: Evmenova Galina , Evmenov Sergey
Published: June 2019

Use of flocculants -high-molecular synthetic water-soluble polymers, is one of the most perspective and economical methods for purification of the return and waste waters from coal preparation plants, and intensification of the whole coal processing process. For efficient use of flocculants, it is necessary to prepare homogeneous aqueous solutions, for which an optimal mixing mode should be selected, taking into account energy costs and quality of the concentrated solution. The paper presents herein result of the homogenization process analysis at preparation of solutions used for slurry water purification. Based on study of the rheological solution behavior and determination of the required for the numerical analysis of the process parameters of the rheological constants, power costs, homogenization time, type of equipment and mixing device have been determined.
Study of the Backhoe’s Digging Modes at Rock Face Working-Out
Authors: Litvin Oleg , Makarov Vladimir , Strelnikov Andrey , Tyuleneva Ekaterina
Published: June 2019

As is known from the classic works on open pit mining, the bench is a separately developed part of the rock layer, having the form of a step. It should also be noted that it is necessary to clearly differentiate the concepts of “bench height” and “height of the layer to be removed.” The benches are often divided into subbenches, developed by different excavation equipment or by the same equipment both sequentially and simultaneously, but having transport routes that are uniform for the bench. As an example, an excavator stripping of the upper and lower subbenches with loading, respectively, at the level of the excavator and above this level, is usually given, that is, the transport route (road) passes through an intermediate platform bench located in the middle of its height. Therefore, the excavation layer of any height, which is, in fact, a part of the working bench, can be considered as an independent bench with all its attributes, but in order to avoid duplication of definitions, this paper suggests the name “extraction layer”. When developing this element various digging modes can be applied. In this paper, we studied the main modes and selected the one that provides the highest performance.
Coal and Gas Outburst Prevention in Longwalls by Means of Powered Support Unit of New Type
Authors: Tarasov Vladimir , Fomin Anatoly
Published: June 2019

The paper considers a new type of powered roof support unit in the framework of interaction with geomechanical processes within the ground rock, particularly, in the thermodynamic balance capsule. Its novelty in comparison with similar Russian and foreign technologies consists is in the fact that geomechanical system “support–ground rock” is brought into the state of balance, which increases the safety of mining works at a coal extraction face.
Methodology for the Selection of In-Seam Gas Drainage System for Intensive and Safe Coal Mining Synops
Authors: Yutyaev Evgeny , Mazanik Evgeny , Slastunov Sergey , Batugin Andrian
Published: June 2019

The article reviews general principles of selecting efficient solutions of in-seam gas drainage and provides analytical foundation for selecting parameters of in-seam gas drainage with due account for estimated output of production face. The schemes of degassing preparation at the production facilities of Kuzbass are presented. Recommendations are provided on the selection of in-seam gas drainage methods at the production areas of Kirova Mine, JSC SUEK-Kuzbass.
On the Issue of the Influence of Interfacial Interactions on the Filtration Processes in Coal
Authors: Elkin Ivan , Tan Yunliang
Published: June 2019

The features of gas-liquid fluid filtration processes in a coal mass are discussed and general patterns of mass transfer, extending previously known concepts, are established in the article. It indicates the degree of the influence of wettability, contact angle of wetting on filtration processes. It is assumed the coal-liquid-gas interfacial interactions when infusing the coal mass lead to the deformation of capillary pore space of coal, splitting, swelling and clogging of filter pores and capillaries. A comparison is made between the thermal effect and the effect of surfactants on the deformation processes of the capillary-porous structure of coal. Filtration processes are described by the gas-liquid fluid mass transfer equations. Coal-liquid-gas interfacial processes lead to a change in the state of the interacting phases, which leads to a change in both the filtration properties of the liquid and the filtration properties of a capillary pore space, which is especially characteristic of coal in relation to other rocks. Investigating the interfacial interactions when filtering in the laboratory, it is possible to determine the functions of the variation of the key coefficients in the mass transfer equations. On the basis of such studies, it is possible to predict the results of mass transfer in a coal mass being infused or degassed, as well as the change in the coal mass stress state.
Determination of the Parameters of Geomechanical Stress Undulation Along the Length of a Face
Authors: Shinkevich Maksim , Shevchenko Leonid , Grishin Valery
Published: June 2019

The use of the mass structuring flowchart will make it possible to forecast the methane release when mining a coal seam, to determine in advance and reasonably areas of increased rock pressure on a coal seam and a powered support. It will allow forecasting the areas of the negative rock pressure effect along the length of a face, increasing coal mining performance due to a more accurate calculation of the load on a stope and the cutting machinery output, correcting the force of the working bodies of cutting machines when destructing a coal seam, selecting face supports according to their bearing capacity, planning measures to eliminate the negative rock pressure effect in these areas, strengthen a selvedge to reduce the visible coal sloughing. Coal mining performance and safety will increase.
Investment Risk Management at Mining Enterprises
Authors: Frolova Victoria , Dolina Olga , Shpilkina Tatyana
Published: June 2019

The development of the Russian economy requires an increase in production factors, including energy, fuel and raw materials. Sustainable functioning of mining enterprises has an impact on the development of such industries as metallurgy, engineering, road construction and predetermines the development of the country’s economy as a whole. The article substantiates the need to form an investment risk management system in the mining industry to encourage expansion of environment-saving measures funding. The stages of investment risk management are proposed and their content is disclosed. The most significant types of investment risks and uncertainties in assessing geological exploration investment projects in the mining industry are considered. The recommendations for considering the factors of uncertainty and risk when evaluating the effectiveness of environmental and geological exploration investment projects to use maximum information about the conditions for the implementation of projects. For risk assessment, various qualitative and quantitative methods have been proposed, and the advantages of the Monte-Carlo simulation method are shown.
Improving the Stability of the Rock Massif by Choosing Rational Configurations of Workings and Methods of Their Support
Authors: Bedarev Nikolay , Lyubimov Oleg , Shayhislamov Arthur , Grigorieva Natalya , Abay Asmelash
Published: June 2019

The paper presents simulation results on gypsum-sand mixtures models. The experiments have been carried out simultaneously in three workings of various configurations in the massif before mine cleaning. They show the differences in the redistribution of rock pressure. The authors have identified the ways to improve the study of rock pressure by developing new modeling methods. These methods make it possible to determine changes in deformations of mining massif from the very beginning and during the entire service life of workings, with the fixation of high rock pressure relief zones and stabilization zones, taking into account the time scale.
Conditions of Geotechnological Feasibility of Mineral Reserves
Authors: Engel Jacek , Rybar Radim , Shalamanov Viktor
Published: June 2019

The evaluation of a deposit and mining project is a continuous process rather than a single act. Changes in budget, evaluation criteria, or in the area of costs and incomes may change results valid up to now and the views on using a deposit. Geological quantities are measurable with the help of geological conclusions and engineering calculations. Raw material reserves and their quality are defined as a substance that can be recovered with profit through current technologies and prices. This definition can result in two misunderstandings: geological reserves and the quality of raw materials are understood as variables not connected with mining activities. However, the quantity and quality of remaining reserves depends on changes in our geological knowledge, changing economic conditions, as well as on the exhaustion of reserves. The quantity of reserves and value of the cut-off grade depends not only on geological factors but also upon the methods of deposit extraction, costs and prices.
The Methods of Process Planning Gas Treatment Facilities of a Power Plant
Authors: Aksenova Olesya , Nikolaeva Evgenia , Paulman Riccardo
Published: June 2019

The article seeks to examine the efficiency of applying means of mathematical processing and computer modeling of the work processes of gas cleaning facilities of power plants to optimize the process of planning and designing of future power plant in operation. A way of solution of the gas outbursts cleaning problem at the stage of designing measures for the development of waste processing systems through mathematical processing of expected volumes of gas outbursts and computer simulation of individual pieces of equipment and working areas as a whole is offered. The authors present the results of the processing of the projected technological processes and the gas outbursts cleaning facilities in terms of E-networks and using mathematical processing in the application Simulink, which allows to build a model of the device and to carry out calculations on the screen using the library of building blocks. A 3D model of the gas cleaning facilities, which allows to visualize the technological process and to compare it with theoretical calculations at the design stage of the future power plant and, if necessary, make changes to the project, has been created by means of computer modeling.
Use of Irradiated Flocculants for Wastewater Treatment
Authors: Berlinteyger Evgenia , Tyuleneva Tatiana , Malik Chandara
Published: June 2019

Despite the fact that the problem of petroleum-containing wastewater treatment has existed for decades, it is not completely solved due to the lack of optimal the method of solving the problem from the point of view “cost – results”. Therefore, the treatment of petroleum-containing waste water, giving in the amount of a huge amount of waste, difficult to handle in conventional ways, is an urgent task, especially for small and medium-sized enterprises. The article presents an approach to solving the problem of wastewater treatment by physical and chemical means, which creates the prerequisites for a more efficient treatment of petroleum effluents technically auxiliary materials, such as synthetic flocculants. The technological properties of flocculants with different molecular weight, charge and degree of ionicity are investigated. The dependences of the processes of swelling, adsorption, the rate of petroleum products` cover formation on the surface of wastewater of a refinery on the type of flocculant are determined. The advantages of this method of treatment in comparison with other methods of improving the purity of wastewater of petroleum refineries are described.
Combined Microfiltration and Reverse Osmosis Process for Mining Water Treatment
Authors: Bakalár Tomáš , Pavolová Henrieta , Kozáková Ľubica , Puškárová Petra , Vasilková Kmecová Martina
Published: June 2019

Nowadays mining water flowing out of an ore mine can be a serious threaten to the environmental due to high content of metals, especially heavy metals as well as solid particles. For this reason, this work proposes a membrane technology for mining water treatment so that the treated water meets the quality criteria of water for release into a recipient or industrial use. First polluted water was prepared, containing high concentrations of metals as well as other elements. Water was treated by selected membrane processes (stage 1 - microfiltration, stage 2- reverse osmosis). The stage 2 produced demineralized water, which was remineralised using Semidol – a dolomitic filter-material approved under DIN EN 1017 and DIN 2000. It can be concluded that the resulting water quality in terms of hardness and presence of nitrates and heavy metals improved and the water treatment method is suitable for preparation of both water safe for the environment and industrial water.
The Exploitation of Energy Raw Materials and Environmental Protection in the Slovak Republic Legislative
Authors: Kuzevič Štefan , Bindzárová Gergeľová Marcela , Kuzevičová Žofia
Published: June 2019

The exploitation and use of energy raw materials is an indispensable need for each country to build the country’s economy. In pursuing the sustainable development objectives that Slovakia has pursued, it is necessary to link mining and exploitation and environmental protection, taking into account the rational use of natural resources for the future for future generations. The article focuses on the characteristics of legal norms and strategic documents of Slovakia. With the advancement of raw materials exploitation and processing technology, the share and focus on environmental protection is increasing, contributing to improving the environment of the country and region’s population.