bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantum signatures in the quantum Carnot cycle
Authors: Dann Roie , Kosloff Ronnie 
Published: January 2020

Abstract
The Carnot cycle combines reversible isothermal and adiabatic strokes to obtain optimal efficiency, at the expense of a vanishing power output. Quantum Carnot-analog cycles are constructed and solved, operating irreversibly with positive power. Swift thermalization is obtained in the isotherms utilizing shortcut to equilibrium protocols and the adiabats employ frictionless unitary shortcuts. The working medium in this study is composed of a particle in a driven harmonic trap. For this system, we solve the dynamics employing a generalized canonical state. Such a description incorporates both changes in energy and coherence. This allows comparing three types of Carnot-analog cycles, Carnot-shortcut, Endo-shortcut and Endo-global. The Carnot-shortcut engine demonstrates the trade-off between power and efficiency. It posses a maximum in power, a minimum cycle-time where it becomes a dissipator and for a diverging cycle-time approaches the ideal Carnot efficiency. The irreversibility of the cycle arises from non-adiabatic driving, which generates coherence. To study the role of coherence we compare the performance of the shortcut cycles, where coherence is limited to the interior of the strokes, with the Endo-global cycle where the coherence never vanishes. The Endo-global engine exhibits a quantum signature at a short cycle-time, manifested by a positive power output while the shortcut cycles become dissipators. If energy is monitored the back action of the measurement causes dephasing and the power terminates.
Laser-cooled polyatomic molecules for improved electron electric dipole moment searches
Authors: Augenbraun Benjamin L , Lasner Zack D , Frenett Alexander , Sawaoka Hiromitsu , Miller Calder , Steimle Timothy C , Doyle John M 
Published: January 2020

Abstract
Doppler and Sisyphus cooling of 174YbOH are achieved and studied. This polyatomic molecule has high sensitivity to physics beyond the Standard Model and represents a new class of species for future high-precision probes of new T-violating physics. The transverse temperature of the YbOH beam is reduced by nearly two orders of magnitude to < 600 μK and the phase-space density is increased by a factor of > 6 via Sisyphus cooling. We develop a full numerical model of the laser cooling of YbOH and find excellent agreement with the data. We project that laser cooling and magneto-optical trapping of long-lived samples of YbOH molecules are within reach and these will allow a high sensitivity probe of the electric dipole moment of the electron. The approach demonstrated here is easily generalized to other isotopologues of YbOH that have enhanced sensitivity to other symmetry-violating electromagnetic moments.
Search for QCD critical point by transverse velocity dependence of anti-deuteron to deuteron ratio *
Authors: Yu Ning , Zhang Dingwei , Luo Xiaofeng 
Published: January 2020

Abstract
We propose the transverse velocity (

) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions. The QCD critical point can attract the system evolution trajectory in the QCD phase diagram, which is known as the focusing effect. To quantify this effect, we employ the thermal and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near the critical point. We found that the focusing effect can lead to anomalous

dependence on

,

and

ratios. We examined the

dependence of

and

ratios of central Au+Au collisions at

7.7 to 200 GeV measured by the STAR experiment at RHIC. Surprisingly, we only observe a negative slope in

dependence of

ratio at

19.6 GeV, which indicates the trajectory evolution has passed through the critical region. In the future, we could constrain the location of the critical point and/or width of the critical region by conducting precise measurements on the

dependence of the

ratio at different energies and rapidity.
Scalar field in massive BTZ black hole and entanglement entropy *
Authors: Zhou Yu-Ting , Kuang Xiao-Mei 
Published: January 2020

Abstract
In this paper, we investigate the quantum scalar fields in a massive BTZ black hole background. We study the entropy of the system by evaluating the entanglement entropy using a discretized approach. Specifically, we fit the results with a log -modified formula of the black hole entropy, which is introduced by quantum correction. The coefficients of leading and sub-leading terms affected by the mass of graviton are numerically analyzed.
Durability of suspension facade systems with air gap
Authors: Mamin A N , Kodysh E N , Bobrov V V , Reutsu A V , Volkova O V , Chaganov A B 
Published: January 2020

Abstract
Overhanging ventilated facade is a very important engineering structure, the experience of using which in construction engineering for a long time, especially in this country, is not so wide. Information available in foreign publications, mostly in special ones, is, as a rule, of the advertising type. Details of the design, which determine the corrosion resistance of the ventilated façade and consequently its durability, lack in these sources. Thus, the corrosion resistance of supporting structures in suspension façade systems (further SFS) is one of the main parameters influencing their reliable and safe operation.
The planned term of facade usage is not clear either. According to the data available, in foreign practice the term of exploiting ventilated facades is 25 years. In Russia [1, 2] the estimated term for ventilated façade operation varies from 25 to 50 years.
In Germany, scientific research has been made and the first modern design elements as well as technologies for mounting the ventilated façades have been developed since 1950-ies. The all-European Manual ETAG 034 is used now.
The analysis has shown that there is no enough regulation and technical documents of the federal level for designing, erecting and using SFS. In studying the documents it has been found that there is enough practical experience accumulated for using various SFS, on the basis of which it is possible to draw up national regulation documents for providing safe exploitation and durability of suspension facade systems.
The paper contains data on forecast terms of SFS operation in normal conditions of their usage, which have been determined after investigation of corrosion defects in bearing metal components of various SFS.
Integrated assessment of contractor’s building production culture during facade repair
Authors: Degaev Evgeniy , Barkhi Reza 
Published: January 2020

Abstract
The article deals with the methodology of assessing the culture of construction production of the contractor on the object of capital repairs, in particular repairs of facades of apartment buildings. Due to the fact that the culture of production is a mirror of labor relations, a mirror of human, political and economic maturity of managers, the quality of work performed will directly depend on this. For complex assessment 8 groups of criteria were determined, which, depending on the types of work, contain various controlled indicators, estimated by the linear function of the associated values.
Simulation model of thermal-seepage regime of thawing dams with permafrost curtain
Authors: Aniskin N A , Antonov A S 
Published: January 2020

Abstract
The paper considers the joint thermal-seepage problem applicable to earth dams and dykes operating in conditions of permafrost. The problem is being solved using the finite elements method in the local-variation setting. There was worked out the model of thermal-seepage regime of the system «dam-foundation base» applicable to the tailings dike. Estimation is given to the impact of heat-mass transitions and phase changes of the liquid in earth pores on the dike state. Investigations have been done with further consideration of these factors. The results of investigation of the thermal-seepage state of the structure with consideration of factors of heat-mass transition and phase changes show that the results of calculations correspond to field data. Ignoring these factors or one of them distorts the real picture of the dike thermal-seepage state.
Technology of installation and dismantling of soft synthetic fencing rod spatial dome
Authors: Strigin Boris 
Published: January 2020

Abstract
This article deals with the issues of prevention, installation and dismantling of removable tent fencing, with an area of 1250 m2, space-rod dome with a diameter of 43 m of a multi-purpose public center: dining room, cinema-concert and conference hall for 600 seats, dance floor for up to 1000 people. Subject of research: installation and dismantling works on soft synthetic fencing of the dome - shaped structure of the public center. Objectives: to determine the technological sequence and take into account the nuances of the process of operation, installation and dismantling of soft synthetic fencing of the spatial dome of the public center.
Prediction of the coefficient of thermal expansion of building materials based on polyvinyl chloride
Authors: Wang C , Kondrashchenko V I , Matseevich A V 
Published: January 2020

Abstract
The possibility of predicting the coefficient of thermal expansion for the blends of polyvinyl chloride (PVC) with a number of organic polymers is shown. It was found that the higher the glass transition temperature of the polymer, the lower the coefficient of thermal expansion of the mixture of PVC with this polymer. The dependence of thermal expansion for composites based on wood of different species and bamboo is also analyzed. In all cases, the coefficient of thermal expansion is reduced, which allows the use of forecasting results for the development of new PVC-based building materials with improved thermal properties.
Modeling of stage of construction and operation of unique large-span structures
Authors: Razzakov S R , Axmadiyarov U S , Razzakov N S 
Published: January 2020

Abstract
The results of the study of long-span unique buildings and structures using spatial structures performed on full-scale models of structures subjected to prolonged static and dynamic effects are presented. According to the results of theoretical and experimental studies, the behavior of spatial systems of various geometric shapes under dynamic impacts of high intensity is revealed. The purpose of the maximum load level for seismic impacts of various intensities, the maintenance of spatial stiffeners, the inclusion of which contributes to the way out of the resonant state of the spatial system, is proposed.
Global asymptotics of particle transport in porous medium
Authors: Kuzmina L I , Osipov Yu V , Zheglova Yu G 
Published: January 2020

Abstract
Particle transport in a porous medium occurs in environmental, chemical and industrial technologies. The transport of suspended concrete grains in a liquid grout through porous soil is used in construction industry to strengthen foundations. When particles are transported by a fluid flow in a porous medium, some particles are retained in the pores and form a deposit. The aim of the work is the construction and study of a one-dimensional mathematical model of particle transport and retention in the porous medium, taking into account the simultaneous action of several particle capture mechanisms. The model consists of mass balance equation and the kinetic equation of deposit growth. The deposit growth rate is proportional to the filtration function of the retained particles concentration, and the nonlinear concentration function, which depends on the concentration of suspended particles. The use of a new parameter, depending on the distance to the porous medium inlet allows to construct a global asymptotic solution in the entire area of the mathematical model. Asymptotics is obtained as a series in two small parameters. The global asymptotics is close to the numerical solution at all points of the porous medium at any time.
Filtration model with multiple particle capture
Authors: Osipov Yu V , Safina G L , Galaguz Yu P 
Published: January 2020

Abstract
Grout filtration in porous soil is used in construction industry to create underground waterproof walls. When the suspension flows through the pores, various forces act on the suspended particles, blocking them on the frame of the porous medium. A one-dimensional model of deep bed filtration for a monodisperse suspension in a porous medium with several particle capture mechanisms is considered. The mathematical model includes the equation of mass balance of suspended and retained particles and the kinetic equation of deposit growth with a piecewise-smooth linear-constant filtration function and a nonlinear concentration function. The solution of the nonlinear model is obtained by the finite difference method using an explicit difference scheme with second-order approximation. To construct the asymptotics of a complex model, the solutions of simplified linear and semilinear models and their combination are used. In the zone of a smooth filtration function, the best approximation of the solution of a complex model is determined by a certain linear combination of simple solutions. In another area, solution of a simplified problem with a piecewise-smooth filtration function and a linear concentration function is closest to the solution of a nonlinear model. Calculations show that in the zone of a smooth filtration function, a combination of simple solutions defines a solution approximation with second-order of smallness. In the area where it is necessary to take into account the non-smoothness of the filtration function, the approximation of a solution has a first order of smallness.
Microwave unit for heat treatment of building materials
Authors: Vorotyntseva Irina 
Published: January 2020

Abstract
Building materials microwave processing demonstrates a great number of perspective advantages as compared to traditional heating methods. In order to upgrade the technology of microwave heating there has been developed a mathematical model of the technological process of microwave energy heat treatment of loose building materials. As a result we have won some calculation correlations, developed a numerical model and calculation algorithms for the analysis and synthesis of the microwave dryer of a loose dielectric with losses while it moves along the working camera. The results of the practical calculations have been carried out with the regard for water load and without it, also with the regard for the changes of the electro- and thermal-physic parameters during the heat treatment as well as disregarding them.
Calculation methods and problems of optimizing the effective characteristics of rods made of composite materials
Authors: Bobyleva T N , Shamaev A S 
Published: January 2020

Abstract
A pipe made of composite material is considered. Two approaches are proposed. The first is based on the averaging method. In this case, an effective model is a model of a hollow circular cylinder. In the second approach, a one-dimensional beam is an effective model. We also represent the problem of minimizing the weight of the pipe at fixed stiffness of the layers. The paper shows that this problem is equivalent to a well-studied nonlinear programming problem.
Checking the integrity of piles by seismoa cousticdefectos copy
Authors: Degaev Evgeniy , Rimshin Vladimir I 
Published: January 2020

Abstract
The article presents the results of studies of pile continuity by seismic acoustic flaw detection. The test results revealed the dependence of soil homogeneity on the signal frequency. At the interface of two different density soils, the sound wave is reflected and partially passes on, creating characteristic peaks of false defects. In order to eliminate false defects, geological studies of soils with layer-by-layer occurrence are necessary.
Constructions Mechanical and Thermal Conditions Modeling with GPU-based Approach
Authors: Sazonov V.V. , Samylovskiy I.A. , Morozov O.V. 
Published: January 2020

AbstractAt present, there are two parallel trends related to spacecraft development tasks and problems. From the one side, due to complexity of constructions and growing use of high-power large-sized antennas, it is necessary to consider the effect of self-shading and research the effects accompanying this phenomenon. From the other side, modern computer tools, especially GPUs (graphics processing unit), allow one to create “mini-supercomputer” based on “common” desktop/laptop and perform CAE (computer-aided engineering)-based processes using 3D models of different LOD (Level-of-detail). In this paper, we present a conception of SA parameters computer modeling based on hierarchical, property-based 3D-model of spacecraft. Thus, one can model different work modes of spacecraft on the project stage, with real-time prediction of effects related to space factors complex combination impact. The result is easy-to-edit, easy-to-calibrate “digital twin” of spacecraft which allows engineer to model and investigate complex space factors combination results for a different orbital work mode..
The temporal correlation transfer in layered bio-models
Authors: Kuzmin V L , Val’kov A Yu , Zubkov L A , Zhavoronkov Yu A 
Published: January 2020

Abstract
The temporal correlation functions are simulated for a two-layer model of a highly inhomogeneous medium which can be considered as the scull-brain imitation, or phantom. The temporal decay of correlations are considered for two different mechanisms of particle movement, either the Brownian diffusion, or the random velocity square mechanism. The results obtained are turned to be highly dependent on the form of the kinetics of scatterers.
High-speed tensile testing of extruded PC based polymers for cable ducts
Authors: Noller S F , Pfennig A , Heiler R 
Published: January 2020

Abstract
Previous tensile tests at 50, 100 and 400 mm/min using standard polycarbonate/acrylonitrile butadiene styrene (PC/ABS) material qualities have led to the suspicion that strain at break decreases with increasing test speed. Here, the plastic deformation component is regarded as the main burr cause. Thus, higher process speeds during punching would lead to less burr formation. This thesis was proven by high-speed tensile tests with a self-developed test rig operating at a test speed of 36.000 mm/min. Both, pure standard materials, provided by a polymer granules supplier, and customized materials were investigated. The customized materials contain unknown additives generally used in industry, e.g. fillers. All samples were taken laterally from in-situ cable ducts. The remaining plastic strain was introduced as material parameter to compare the results of high-speed and conventional tensile tests. The investigations show that the remaining plastic strain which is understood as the major burr cause decreases with increasing test speed. Furthermore, the mean values of the remaining plastic strain of the individual materials converge when exposed to higher test speeds. This leads to the thesis that one tool configuration can be used for different polycarbonate (PC) based materials presumed the process speed is adjusted correctly.
Foundation design taking into account non-linear soil behavior in karst-hazardous areas
Authors: Shebunyaev Alexander , Yudina Irina 
Published: January 2020

Abstract
The article solves the problem of stress and strain state of the subgrade waned by cylindrical neckline, modeling the karst pothole area. The solution was obtained taking into account nonlinear behavior of the soil subgrade based on using the A.I.Bonkin bilinear subjection. In the article are presented the visual results of calculations as the isofields of stresses and strains. The obtained solution allowed us to offer for consideration an updated analytical model of karst-resisting foundations of buildings and constructions. In the proposed analytical model was adopted a variable coefficient of subgrade reaction, varying according to the bilinear law.
Application of Jet Grouting technology for the renovation of historic buildings
Authors: Makowski Andrzej , Polańska Bernadetta 
Published: January 2020

Abstract
Renovation and restoration of historic buildings to appropriate functioning is a big challenge for the designer. In the case of this type of buildings, providing them with a new function usually requires the creation of new technical areas for installations and parking spaces. However, the change of function cannot be associated with a fundamental change in the image of the modernised building. In such case, additional areas are obtained by building in the underground spaces under courtyards, streets and often also under existing structures. In certain situations, the mere change in the function of existing underground levels forces an increase in their usable height by deepening of the foundation. Subsequent problem encountered during modernisation is the change in load of individual foundation elements, which is related to the rebuilt static system of the historic structure. In such case, the fragments of foundations require reinforcement that can be implemented by their deepening. One of the methods that enables improvement of the usable properties of basements by increasing their height, as well as reinforcement of the foundations of historic buildings, is jet grouting. This technology resolves many problems associated with limitations in the scope of size of used equipment and access to the place of formation of soil cement elements. Its application allows to significantly facilitate and accelerate the works at the construction site. This study presents the selected examples of the implementation of specialised geotechnical works in the scope of modernisation of historic buildings in Poland, as well as dependence of the strength of soil cement composite on the soil type.
Prediction of construction bases frozen soil temperature development under intense heating
Authors: Kiselyov F , Sergeyev F 
Published: January 2020

Abstract
The purpose of the article is to assess development of the temperature field of the bases for foundations of horizontal burner devices (HBDs), considering seasonal changes in temperature and operation of horizontal flares (HFs). Predictive analysis is based on the solution of a quasilinear system of thermoelasticity equations, which takes into account the mutual influence of mechanical and temperature fields. An iterative algorithm is proposed that allows, at each time step, to obtain separately the solution of the heat conduction and elasticity equations while maintaining their physical coupling. The results of thermal insulation calculation of a flare pit for a gas well cluster are presented.
Cooling times’ dependence on the glassy NiTi at extremely low temperatures: a result from rapid solidification using molecular dynamics simulations
Authors: Alif Mahendra Bagus Nurcahyo , Arifin Rizal , Malyadi Muhammad , Munaji  , Ghulam Asrofi Buntoro , Ridwan  , Alfiyan Sukron Huda , Frengky Vion Dwi Ariadhi 
Published: January 2020

Abstract
In this paper, we evaluate the structure of glassy NiTi at 10 K obtained from molecular dynamics simulations using various cooling times. The final configurations of glassy NiTi were produced by decreasing the temperature of liquid NiTi rapidly from 2500 K to10 K during 0.1 nanoseconds (ns) to 1.0 ns of cooling times. The results show that the count of BCC-like and Icosahedral-like local structure increases at the longer cooling times, while the count of HCP-like local structure decreases when the cooling times become longer. We also observe that the count of FCC-like local structure almost remains constant for all cooling time variations.