bluuebunny/crossref_metadata_2025_split huggingface dataset:
A transient process observation method based on the non-homogeneous Poisson process model *
Authors: Zhao Kuo , Ouyang Xiao-Ping , Guo Hui-Ping , Chen Liang , Zhou Lei-Dang , Ruan Jin-Lu , Wang Han , Lv Ning , Gao Run-Long 
Published: January 2021

Abstract
The current-mode-counting method is a new approach to observing transient processes, especially in transient nuclear fusion, based on the non-homogeneous Poisson process (NHPP) model. In this paper, a new measurement process model of the pulsed radiation field produced by transient nuclear fusion is built based on the NHPP. A simulated measurement is performed using the model, and the current signal from the detector is obtained by simulation based on Poisson process thinning. The neutron time spectrum is reconstructed and is in good agreement with the theoretical value, with its maximum error of a characteristic parameter less than 2.3%. Verification experiments were carried out on a CPNG-6 device at the China Institute of Atomic Energy, with a detection system with a nanosecond response time. The experimental charge amplitude spectra are in good agreement with those obtained by the traditional counting mode, and the characteristic parameters of the time spectrum are in good agreement with the theoretical values. This shows that the current-mode-counting method is effective for the observation of transient nuclear fusion processes.
Improving reliability and efficiency of hydraulic turbines
Authors: Gusak O , Cherkashenko M , Potetenko O , Gasiyk A , Rezvaya K 
Published: January 2021

Abstract
The article deals with new design solutions to improve the operating process based on new design solutions and effectively use hydraulic turbines for heads up to 800-1000 m, expand the operating range relative to flow rates and heads with high energy and cavitation indicators and reliability of operation on varying modes that differ from the optimum operating mode.
On the basis of complex experimental studies of the flow pattern in a water passage and, first of all, in the hydraulic turbine inlet for heads of 400-500 m, this article reveals the causes of increased energy losses. The energy losses are caused by large vortexes occurring in the spiral casing; they distort the flow directed to the runner of the hydraulic turbine. Several ways for improving the operating process are proposed, including new design solutions.
The issues of improving the operating process of various types of hydraulic turbines are discussed. This is done by creating an angular momentum upstream the runner blades, which is necessary for optimum operation of the hydraulic turbine due to flow inlet using nozzle vanes located around of the runner inlet. The advantages of new types of hydraulic turbines and a more advanced operating process are illustrated by the hill diagram of this turbine.
New flowing system in cooling system axial-flow pump in a hard coal electric power plant
Authors: Peczkis G , Synowiec T , Zahorulko A 
Published: January 2021

Abstract
This article presents the new construction of a centrifugal impeller pump which supplies the cooling system in coal power plants. The article also shows the history of producing this kind if pumps for unified 125 MW and 200 MW power units which dominate in Poland. The process of numerical analysis and conventional calculations leading to the improvement of qualities of the flowing system exceeding literature indicators are presented. The article shows the problems which appeared during assembling the pump in its target workplace. The results of the measurements of the pump flowing system in its target workplace are presented.
Effect of gas content in the pumped liquid on the characteristics of a torque flow pump
Authors: Sapozhnikov S , Antonenko S , Miltykh V , Moskalenko V , Mandryka A 
Published: January 2021

Abstract
The article considers one of the ways to increase the ability of a dynamic pump to pump gas-liquid mixtures - the application of the vortex principle of energy transfer. This scheme is embodied in a torque flow pump, which is able to pump mixtures with a gas content of up to 0,40 - 0,45 without additional devices for preparing the mixture. Experimental researches the influence the value of the volumetric gas content on the performance characteristics of the torque flow pump of the "Turo" type are given. The analysis of influence of structure of a stream of gas-liquid mixture on the value of the critical gas content in the interblade channels of the impeller is represented and developed a physical model of decrease the parameters of the torque flow pump.
Combined operating process of torque flow pump
Authors: Panchenko V , German V , Kondus V , Ivchenko O , Ryasnaya O 
Published: January 2021

Abstract
Due to a simple design and hydraulic passage that is the least susceptible to clogging, torque flow pumps (TFP) of Turo type are the most common pumps used for pumping various hydraulic mixtures. These pumps are referred to vortex pumps, operation of which is accompanied by energy loss and vortex formation resulting in low economic efficiency. Since the TFP is a vortex hydraulic machine, the ratio of the fluid velocity in the free pump passage to the impeller rotational speed ωfluid
/ω is an indicator of the TFP efficiency. The higher the value of ωfluid
, the more efficient the pump is. The mechanism of the energy transfer in the TFP is caused by both blade and vortex operating process, or a combined operating process. The efficiency of the pump can be improved by increasing the portion of blade operating process. The aim of the study is to improve the efficiency of the TFP of Turo type by modifying the impeller design, to obtain a basic equation of the TFP with a new impeller which has several extended blades, and to study the influence of the impeller geometry on the pump performance experimentally. The study was carried out by analytical and experimental methods. The equation describing the head dependence on the hydraulic passage dimensions of the pump with a new impeller was obtained analytically. This equation can be used to clarify the methodological recommendations for designing the pump. The energy balance in the TFP was analyzed. During the testing on a test rig, the characteristics of the pump were obtained, which confirmed the advantages of using the modified impeller with extended blades resulting in increase of the portion of the blade operating process.
Experimental and numerical analysis of the rail with the heat control valves
Authors: Romanik G , Rogula J , Machalski A 
Published: January 2021

Abstract
The article presents the results of experimental and numerical tests of a surface heating flow control system consisting of a distribution rail along with the fixed valves set. The flow rates of single and parallel installed valves were measured, their three-dimensional models were prepared and used to make a flow models. The coefficient of kv is computed for a single valve on the rail and for the set of valves. In a flow model geometry the measurements of the test stand elements were considered in order to compare the results. The influence of the addition of the valves to the rail on the flow rate distribution was determined.
Increasing of durability of mechanical seals of oil and gas centrifugal pumps using tungsten-free cermet with Cu-Ni-Mn binder
Authors: Shihab T A , Shlapak L S , Namer N S , Prysyazhnyuk P M , Ivanov O O , Burda M J 
Published: January 2021

Abstract
The rational materials selection for friction pairs is an important prerequisite in promoting of reliable operation of mechanical seals used in centrifugal pumps. The experience of mechanical seals exploitation shows that most preferable is combination of “hard” and “soft” materials. As “hard” materials ceramics based on SiC, Al2O3, Si3N4, are the most commonly employed and for “soft” materials metal alloys, composites and carbon materials are widely used. In this study chromium carbide based composite metal-ceramic material with copper-nickel-manganese binder was developed for using in mechanical seals rings friction couples with silicon carbide (SiC) ring. Metal-ceramic sealing rings were manufactured by infiltration of pre-sintered porous chromium carbide skeletons with Cu60-Ni20-Mn20 melt at 1150 °C in protective (argon) atmosphere. Results of experimental investigations and theoretical modelling of heat transfer during friction, show significant advantages of proposed materials combination over ceramic-ceramic pairs through its better tribological characteristics and resistance to thermal shock. Industrial testing allows us to conclude that using of mechanical seal rings of proposed materials combination almost completely prevents failures of sealing rings surfaces caused by thermal cracking.
The adaptive benefits of agricultural water markets in California
Authors: Arellano-Gonzalez Jesus , AghaKouchak Amir , Levy Morgan C , Qin Yue , Burney Jennifer , Davis Steven J , Moore Frances C 
Published: January 2021

Abstract
Climate change is expected to increase the scarcity and variability of fresh water supplies in some regions with important implications for irrigated agriculture. By allowing for increased flexibility in response to scarcity and by incentivizing the allocation of water to higher value use, markets can play an important role in limiting the economic losses associated with droughts. Using data on water demand, the seniority of water rights, county agricultural reports, high-resolution data on cropping patterns, and agronomic estimates of crop water requirements, we estimate the benefits of market-based allocations of surface water for California’s Central Valley. Specifically, we estimate the value of irrigation water and compare the agricultural costs of water shortages under the existing legal framework and under an alternate system that allows for trading of water. We find that a more efficient allocation of curtailments could reduce the costs of water shortages by as much as $362 million dollars per year or 4.4% of the net agricultural revenue in California in expectation, implying that institutional and market reform may offer important opportunities for adaptation.
Correlated disorder in the SYK2 model
Authors: Chris Lau Pak Hang , Ma Chen-Te , Murugan Jeff , Tezuka Masaki 
Published: January 2021

Abstract
We study the SYK2 model of N Majorana fermions with random quadratic interactions through a detailed spectral analysis and by coupling the model to two- and four-point sources. In particular, we define the generalized spectral form factor (SFF) and level spacing distribution function by generalizing from the partition function to the generating function. For N = 2, we obtain an exact solution of the generalized SFF. It exhibits qualitatively similar behavior to the higher N case with a source term. The exact solution helps understand the behavior of the generalized SFF. We calculate the generalized level spacing distribution function and the mean value of the adjacent gap ratio defined by the generating function. For the SYK2 model with a four-point source term, we find a Gaussian unitary ensemble behavior in the near-integrable region of the theory, which indicates a transition to chaos. This behavior is confirmed by the connected part of the generalized SFF with an unfolded spectrum. The departure from this Gaussian random matrix behavior as the relative strength of the source term is increased is consistent with the observation that the four-point source term alone, without the SYK2 couplings turned on, exhibits an integrable spectrum from the SFF and level spacing distribution function in the large N limit.
Monitoring of endogenous nitric oxide exhaled by pig lungs during ex-vivo lung perfusion
Authors: Chollier Thibaut , Richard Lucile , Romanini Daniele , Brouta Angélique , Martin Jean-Luc , Moro Cécile , Briot Raphaël , Ventrillard Irène 
Published: January 2021

Abstract
In the context of organ shortage for transplantation, new criteria for better organ evaluation should be investigated. Ex-vivo lung perfusion (EVLP) allows extra-corporal lung re-conditioning and evaluation, under controlled parameters of the organ reperfusion and mechanical ventilation. This work reports on the interest of exhaled gas analysis during the EVLP procedure. After a 1 h cold ischemia, the endogenous gas production by an isolated lung of nitric oxide and carbon monoxide is simultaneously monitored in real time. The exhaled gas is analysed with two very sensitive and selective laser spectrometers developed upon the technique of optical-feedback cavity-enhanced absorption spectroscopy. Exhaled gas concentration measured for an ex-vivo lung is compared to the corresponding production by the whole living pig, measured before euthanasia. On-line measurements of the fraction of nitric oxide in exhaled gas (FENO) in isolated lungs are reported here for the first time, allowing to resolve the respiratory cycles. In this study, performed on 9 animals, FENO by isolated lungs range from 3.3 to 10.6 ppb with a median value of 4.4 ppb. Pairing ex-vivo lung and pig measurements allows to demonstrate a systematic increase of FENO in the ex-vivo lung as compared to the living animal, by a factor of 3 ± 1.2. Measurements of the fraction of carbon monoxide in exhaled gas (FECO) confirm levels recorded during previous studies driven to evaluate FECO as a potential marker of ischemia reperfusion injuries. FECO production by ex-vivo lungs ranges from 0.31 to 2.3 ppm with a median value of 0.8 ppm. As expected, these FECO values are lower than the production by the corresponding whole pig body, by a factor of 6.9 ± 2.7.
Effect of iron nanopowder on flammability of epoxy composites
Authors: Nazarenko O B , Lipchansky D S , Smirnova I N 
Published: January 2021

Abstract
Reducing the flammability of polymeric materials is a serious problem that needs to be solved. The paper presents the results of a study of the effect of iron nanopowders, used as filler, on the flammability of epoxy polymers. Epoxy composites filled with 5 wt. % of iron nanopowder and 10 wt. % of boric acid separately, as well as in combination were prepared. The flammability of the prepared samples was evaluated by determining the ignition temperature and time-to-ignition.
Effect of local power systems integration on the distribution network functions
Authors: Byk F L , Myshkina L S , Frolova Ya A 
Published: January 2021

Abstract
The Russian energy industry today needs an “energy transition”. The key link is the Regional Electric Network Companies as the basis of regional power supply system. There are significant changes in the industry, such as changes in legislation, the emergence of new requirements, changes in the regional fuel landscape. The mass appearance of distributed generation as the basis of local power systems has a great influence on the changes. This has led to new functions for Regional Electric Network Companies. The paper studies the effect of local power systems integration on the expansion of the functions performed by distribution network. Particular attention is paid to demand management for electricity; mutual reservation, multi-agent voltage regulation, functions of local energy systems integration with distribution networks.
Powerflow calculations in powersystems considering traction load
Authors: Shestakova V V , Kats I M , Darkhanova A V 
Published: January 2021

Abstract
Nowadays, the negative impact of traction load on power system operation poses a serious problem that may lead to false tripping or even failures of relay protection devices and reduce the quality of electrical energy. This situation is typical for the Zabaikal power system, in which in some areas the share of electricity consumption by railway reaches 70% of total consumption. A computing tool, that would allow simultaneous analysis of the modes, both in the utility’s grid and in the traction network, do not exist. The inability to carry out such analysis often leads to inconsistency in the actions of control centers and railway transport authorities, especially when maintenance planning. Mathematic modeling in such software systems as “Mustang”, “RastrWin3”, “MathCAD”, “Matlab/Simulink”, “PSCAD”, “Kortes”. The developed model represents Zabaikal power system and contain detailed railway between substation Razmahnino – Shilka, Chita – Mogocha. Negative-sequence voltage unbalance factors were calculated for the case of train movement between substation Razmahnino and substation Shilka. Also, the necessity of back-up relays tripping values correction is stated. It was shown that for the powerflow calculations taking into account the traction load, it is rational to use a complex mathematical model, which uses compatible software systems with the ability of quick and easy data exchange.
The development of post-processing algorithm for the ultrasonic evaluation by the application of automated robotic testing systems
Authors: Dolmatov D , Zhvyrblya V , Sednev D 
Published: January 2021

Abstract
The implementation of automated testing systems based on six degrees of freedom (DOF) robotic manipulators is the actual trend in ultrasonic testing equipment development. Such systems are able to provide fast ultrasonic evaluation with the respect of the surface of the testing object. In this work, the post-processing algorithm based on Synthetic Aperture Focusing Technique (SAFT) is suggested. Such algorithm allows presenting the results in the form of high-resolution imagery of the internal structure of testing objects. The suggested algorithm is applicable in the case of the utilization of automated testing systems based on six DOF robotic manipulators and takes into account all the features conditioned by such equipment application. Performance of the suggested algorithm was tested experimentally.
Heating index for combined-cycle
Authors: Shchinnikov P A , Borush O V , Voronkova A S , Belyavskaya P V 
Published: January 2021

Abstract
The technique of the analysis of combined-cycle power plants with binarity coefficient which is less than one is offered. The technique enters a heating indicator. The index characterizes warmth anneafling by combined-cycle power plant. Plant is equipped with the steam turbine with heating selection of steam. Plants with afterburning and dual-fuel plants are considered. Interference of again entered index, degrees of binarity, various efficiencies is at each other shown in this article. The heat balance diagrams and the power streams’s integrated charts of combined-cycle plants on the basis of the gas-turbine unit V64.3 are submitted. The calculated quantitative values of an efficiency on power generation on thermal consumption, coefficient of binarity, a heating index, the relative annealing of warmth and other characteristics for some of the actual or being in a stage of the project combined-cycle plants are given.
Emission properties of YAG: Ce ceramics with barium fluoride flux
Authors: Stepanov S A , Valiev D T , Vaganov V A , Shrayber A M , Paygin V D 
Published: January 2021

Abstract
In this work, we investigated the luminescent properties of YAG, Ce ceramics with an addition of barium fluoride flux. The ceramic samples were sintered from obtained YAG: Ce, BaF2 phosphor powder. Morphological, luminescent and decay time characteristics of YAG: Ce ceramics were investigated. The luminescence decay kinetics analysis of the ceramics showed that the decay time in phosphors and ceramics is different in the visual spectral range.
Remote Reconfiguration for hardware-accelerated integrated Circuits
Authors: Nagler M , Kotre G G , Hardt W 
Published: January 2021

Abstract
When it comes to hardware-accelerated solutions, Field Programmable Gate Arrays (FPGA) are often used to have a good trade-off between performance and the conservative cost restrictions the systems FPGAs are used in commonly have. With reconfiguration or partial reconfiguration the amount of needed resources can be reduced. In this work we show a solution to change the functionality of the system remotely. This means no physical connection is required. The different configurations can either be stored on the board in advance or can be sent to it just in time.
Parallel solution of 3D forward and inverse problems of airborne electromagnetic survey
Authors: Persova M G , Soloveichik Y G , Vagin D V , Kiselev D S , Trubacheva O S , Kondratyeva N S 
Published: January 2021

Abstract
The paper is devoted to the comparison of different approaches to parallel solution of 3D forward and inverse problems of airborne electromagnetic (EM) surveys when multidimensional processing of data obtained on large areas is needed. The mathematical models for the solution of 3D forward and inverse problems and different methods of their parallelization are considered. The results of numerical experiments for the airborne EM survey problem, which is typical of prospecting the kimberlite bodies in Eastern Siberia, are presented. It is shown that the combination of different techniques of parallelization in a distributed computational system, taking into account the specifics of the numerical schemes implementation for forward and inverse problems solution, makes it possible to achieve the speedup close to linear.
Analysis of the opportunities for improving energy efficiency in public buildings
Authors: Terziev A , Stoyak V , Ushakov V , Brazhanova D , Suleimanov S 
Published: January 2021

Abstract
Reducing energy consumption and maintaining an appropriate indoor air quality in buildings is a global trend. This is achieved in several ways – improving the building envelope thermal characteristics; fuel base replacement; introduction of smart energy consumption tracking systems. The aim of this paper is an analysis of the impact of energy efficiency measures introduced in buildings that provide health services. Measures have been taken to improve the energy performance of the envelope, as well as to modernize the system for the production and distribution of thermal energy. One complete year after energy savings measures implemented the total energy savings of 37.9% have been achieved. Further economic assessment has been made regarding the profitability of the applied measures.
The Joule–Thomson effect and the non-equilibrium thermodynamics of sliding nano-contact
Authors: Deeva V S , Slobodyan S M 
Published: January 2021

Abstract
Dynamical systems, having the space-time-varying behavior, takes place in the range of processes. Especially interesting are those which affect the structure and properties complex materials during its formation because of thermal communication between the different parts of the system. One of the most important features of the study is the temperature behavior in the contact area under sliding interaction. This behavior results from the large contribution of the heat capacity to the entropy. We investigate the influence of the Joule-Thomson effect on the behavior and thermal characteristics of contact area formed by debris and lubricant between the sliding surfaces when they are brought into contact with one another in commutator-and-brush assembly as an example. The model reflecting the influence of the change in the third body temperature on the material properties, geometry of the debris and the surrounding environment is proposed. The result shows the strong correlations between Joule-Thomson effect and mechanical fluctuations of the wear particles that are responsible for the size of the contact area.
Influence of modified natural zeolite on the thermal stability of epoxy based composites
Authors: Murashkina Y S , Martemyanov D V , Nazarenko O B 
Published: January 2021

Abstract
The effect of modified natural zeolite of the Shivyrtuysky deposits on the thermal behavior of epoxy composites at the heating was studied. The modification of the zeolite particles with aluminum oxyhydroxide (AlOOH) nanofibers was made. AlOOH nanofibers were obtained at the heating and oxidation of aluminum powder by water. The parameters of thermal-oxidative and thermal destruction of the samples with a filler concentration of 1, 2, 5, and 10 wt. % were determined. The limiting oxygen index was determined by the calculation method.