bluuebunny/crossref_metadata_2025 huggingface dataset:
The combination of multipartitioning of the Hamiltonian with canonical Van Vleck perturbation theory leads to a Hermitian variant of quasidegenerate N-electron valence perturbation theory
Authors: Lang Lucas , Sivalingam Kantharuban , Neese Frank
Published: January 2020

Many recent developments in the area of multistate multireference perturbation theories focused on methods that use a state-averaged 0th order Hamiltonian. We recently found that the dynamic correlation dressed complete active space method fails in describing ligand field and charge transfer states in a balanced way precisely because it uses a state-averaged 0th order Hamiltonian [L. Lang and F. Neese, J. Chem. Phys. 150, 104104 (2019)]. The multipartitioning idea allows the use of state-specific 0th order Hamiltonians in a multistate framework and could therefore alleviate the mentioned problem. However, the effective Hamiltonian is non-Hermitian in the traditional formulation of multipartitioning, which can lead to unphysical behavior, especially for nearly degenerate states. In order to achieve a more balanced treatment of states with different physical character and at the same time have a Hermitian effective Hamiltonian, we combine in this work multipartitioning with canonical Van Vleck perturbation theory. At the 2nd order, the result is a Hermitian variant of multipartitioning quasidegenerate N-electron valence state perturbation theory. The effect of model space noninvariance of the method is discussed and the benefit of a Hermitian formulation is highlighted with numerical examples. The method is shown to give good results for the calculation of electronic transitions of the [CuCl4]2−complex and for the calculation of electron paramagnetic resonance parameters, which are two examples where the balance between ligand field and charge transfer configurations is of utmost importance.
Comment on “Sheath oscillations during directional motion of fire tube formation in expanding RF plasma” [Phys. Plasmas 26, 113502 (2019)]
Authors: Gruenwald J.
Published: January 2020

Measurements regarding the plasma-sheath instability have been described in a recent paper [Phys. Plasmas 26, 113502 (2019)] by the authors Paul and Chakraborty. They measured low frequency oscillations in a cylindrical, highly transparent grid electrode by using Langmuir probes and magnetic field sensors. This topic is very interesting for low temperature plasma physics, especially when it comes to the fundamental understanding of the stability of (multiple) double layers. However, it is questionable if the measured frequencies are originating from a plasma-sheath resonance instability as the observed oscillations are not consistent with the established theory of the plasma-sheath resonance instability.
On the temperature dependence of liquid structure
Authors: Piskulich Zeke A. , Thompson Ward H.
Published: January 2020

We introduce a straightforward method for predicting an equilibrium distribution function over a wide range of temperatures from a single-temperature simulation. The approach is based on a simple application of fluctuation theory and requires only a standard equilibrium molecular dynamics (or Monte Carlo) simulation. In addition, it provides mechanistic insight into the origin of the temperature-dependent behavior. We illustrate the method by predicting the structure of liquid water, as represented by the O–O radial distribution function, for temperatures from 235 to 360 K from a room temperature molecular dynamics simulation.
Spectrally tunable infrared plasmonic F,Sn:In2O3 nanocrystal cubes
Authors: Cho Shin Hum , Roccapriore Kevin M. , Dass Chandriker Kavir , Ghosh Sandeep , Choi Junho , Noh Jungchul , Reimnitz Lauren C. , Heo Sungyeon , Kim Kihoon , Xie Karen , Korgel Brian A. , Li Xiaoqin , Hendrickson Joshua R. , Hachtel Jordan A. , Milliron Delia J.
Published: January 2020

A synthetic challenge in faceted metal oxide nanocrystals (NCs) is realizing tunable localized surface plasmon resonance (LSPR) near-field response in the infrared (IR). Cube-shaped nanoparticles of noble metals exhibit LSPR spectral tunability limited to visible spectral range. Here, we describe the colloidal synthesis of fluorine, tin codoped indium oxide (F,Sn:In2O3) NC cubes with tunable IR range LSPR for around 10 nm particle sizes. Free carrier concentration is tuned through controlled Sn dopant incorporation, where Sn is an aliovalent n-type dopant in the In2O3 lattice. F shapes the NC morphology into cubes by functioning as a surfactant on the {100} crystallographic facets. Cube shaped F,Sn:In2O3 NCs exhibit narrow, shape-dependent multimodal LSPR due to corner, edge, and face centered modes. Monolayer NC arrays are fabricated through a liquid-air interface assembly, further demonstrating tunable LSPR response as NC film nanocavities that can heighten near-field enhancement (NFE). The tunable F,Sn:In2O3 NC near-field is coupled with PbS quantum dots, via the Purcell effect. The detuning frequency between the nanocavity and exciton is varied, resulting in IR near-field dependent enhanced exciton lifetime decay. LSPR near-field tunability is directly visualized through IR range scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS). STEM-EELS mapping of the spatially confined near-field in the F,Sn:In2O3 NC array interparticle gap demonstrates elevated NFE tunability in the arrays.
Adolescents’ perceptions of family social status correlate with health and life chances: A twin difference longitudinal cohort study
Authors: Rivenbark Joshua , Arseneault Louise , Caspi Avshalom , Danese Andrea , Fisher Helen L. , Moffitt Terrie E. , Rasmussen Line J. H. , Russell Michael A. , Odgers Candice L.
Published: January 2020

Significance

Despite growing up in the same family, siblings do not always see their family’s social standing identically. Eighteen-year-old twins who rated their family as having higher social standing, compared with their cotwin’s rating, had fewer difficulties negotiating the transition to adulthood: they were less likely to be convicted of a crime, not in education, employment, or training, and had fewer mental health problems. The same pattern of findings was not seen earlier in adolescence when the twins were aged 12 y. By late adolescence, young people’s beliefs about where their family was located in a hierarchical social system signaled how well they were doing, irrespective of their families’ access to objective financial resources and their earlier psychological vulnerabilities.
Cryo-EM structures of a lipid-sensitive pentameric ligand-gated ion channel embedded in a phosphatidylcholine-only bilayer
Authors: Kumar Pramod , Wang Yuhang , Zhang Zhening , Zhao Zhiyu , Cymes Gisela D. , Tajkhorshid Emad , Grosman Claudio
Published: January 2020

The lipid dependence of the nicotinic acetylcholine receptor from the
Torpedo
electric organ has long been recognized, and one of the most consistent experimental observations is that, when reconstituted in membranes formed by zwitterionic phospholipids alone, exposure to agonist fails to elicit ion-flux activity. More recently, it has been suggested that the bacterial homolog ELIC (
Erwinia chrysanthemi
ligand-gated ion channel) has a similar lipid sensitivity. As a first step toward the elucidation of the structural basis of this phenomenon, we solved the structures of ELIC embedded in palmitoyl-oleoyl-phosphatidylcholine- (POPC-) only nanodiscs in both the unliganded (4.1-Å resolution) and agonist-bound (3.3 Å) states using single-particle cryoelectron microscopy. Comparison of the two structural models revealed that the largest differences occur at the level of loop C—at the agonist-binding sites—and the loops at the interface between the extracellular and transmembrane domains (ECD and TMD, respectively). On the other hand, the transmembrane pore is occluded in a remarkably similar manner in both structures. A straightforward interpretation of these findings is that POPC-only membranes frustrate the ECD–TMD coupling in such a way that the “conformational wave” of liganded-receptor gating takes place in the ECD and the interfacial M2–M3 linker but fails to penetrate the membrane and propagate into the TMD. Furthermore, analysis of the structural models and molecular simulations suggested that the higher affinity for agonists characteristic of the open- and desensitized-channel conformations results, at least in part, from the tighter confinement of the ligand to its binding site; this limits the ligand’s fluctuations, and thus delays its escape into bulk solvent.
High-dose ascorbic acid synergizes with anti-PD1 in a lymphoma mouse model
Authors: Luchtel Rebecca A. , Bhagat Tushar , Pradhan Kith , Jacobs William R. , Levine Mark , Verma Amit , Shenoy Niraj
Published: January 2020

Major efforts are underway to identify agents that can potentiate effects of immune checkpoint inhibition. Here, we show that ascorbic acid (AA) treatment caused genomewide demethylation and enhanced expression of endogenous retroviral elements in lymphoma cells. AA also increased 5-hydroxymethylcytosine (5hmC) levels of CD8+ T cells and enhanced their cytotoxic activity in a lymphoma coculture system. High-dose AA treatment synergized with anti-PD1 therapy in a syngeneic lymphoma mouse model, resulting in marked inhibition of tumor growth compared with either agent alone. Analysis of the intratumoral epigenome revealed increased 5hmC with AA treatment, consistent with in vitro findings. Analysis of the tumor immune microenvironment revealed that AA strikingly increased intratumoral infiltration of CD8+ T cells and macrophages, suggesting enhanced tumor immune recognition. The combination treatment markedly enhanced intratumoral infiltration of macrophages and CD8+ T lymphocytes, granzyme B production by cytotoxic cells (cytotoxic T cells and natural killer cells), and interleukin 12 production by antigen-presenting cells compared with single-agent anti-PD1. These data indicate that AA potentiates anti-PD1 checkpoint inhibition through synergistic mechanisms. The study provides compelling rationale for testing combinations of high-dose AA and anti-PD1 agents in patients with aggressive B cell lymphoma as well as in preclinical models of other malignancies.
Specialized stellate cells offer a privileged route for rapid water flux in
Drosophila
renal tubule
Authors: Cabrero Pablo , Terhzaz Selim , Dornan Anthony J. , Ghimire Saurav , Holmes Heather L. , Turin Daniel R. , Romero Michael F. , Davies Shireen A. , Dow Julian A. T.
Published: January 2020

Significance

The tiny insect renal (Malpighian) tubule can transport fluid at unparalleled speed, suggesting unique specializations. Here we show that strategic allocation of major intrinsic proteins (MIPs) to specific cells within the tubule allows the separation of metabolically intense active cation transport from passive chloride and water conductance. This specialized renal architecture is general to at least many higher insects, providing a clue to the unique success of the class Insecta in colonizing an extraordinary range of ecological niches.
De l’histoire de la traduction en Serbie : la science médiévale et la création des terminologies
Authors: Vinaver Nadežda
Published: January 2020

Abstrait

Dans la communication sur les terminologies médiévales et les sciences respectives est examiné un recueil de
textes médicaux serbes du Moyen âge (XIIe–XVe siècles), intitulé le Code médical du Chilandar, retrouvé en 1952
dans la bibliothèque du monastère serbe Chilandar au mont Athos (en Grèce), et il est comparé à la tradition médicale et
pharmacologique en latin des grandes écoles médiévales occidentales. Dans le cadre des oppositions entre les langues et cultures,
on verra qu’on ne peut indiquer les référents des expressions sans connaître le monde duquel ces référents sont prélevés.
Exploring the emotional problems and mental health needs of elementary school children using cochlear implants or hearing aids in the Islas Canarias
Authors: Alegre de la Rosa Olga María , Villar Angulo Luis Miguel
Published: January 2020

Purpose:

The study aimed to investigate whether emotional and behavioral strengths and difficulties differ between children with cochlear implants (CIs) or hearing aids (HAs), to correlate the outcomes of children on four psychological instruments, and to identify new socio-demographic and linguistic predictors of emotional and behavioral strengths and difficulties in children. A battery of psychological instruments (SDQ, ITPA, Peabody, and Raven’s) was administered to children in two provinces of the Canary Islands, Spain.

Method:

The study involved 187 children with CIs, 113 children with HAs, 176 parents, and 300 schoolteachers.

Results:

Rating disagreements were found between children, parents, and schoolteachers in terms of their SDQ ratings. Total SDQ score correlated weakly with other total ITPA subtests, and the final Peabody and Raven’s outcomes. Six socio-demographic and linguistic factors significantly predicted children’s overall strengths and difficulties.

Conclusion:

Findings have consequences for implementing instructional systems for children who are in need of personal and educational support.
Ecm29-mediated proteasomal distribution modulates excitatory GABA responses in the developing brain
Authors: Lee Min , Liu Yen-Chen , Chen Chen , Lu Chi-Huan , Lu Shao-Tzu , Huang Tzyy-Nan , Hsu Meng-Tsung , Hsueh Yi-Ping , Cheng Pei-Lin
Published: January 2020

Neuronal GABAergic responses switch from excitatory to inhibitory at an early postnatal period in rodents. The timing of this switch is controlled by intracellular Cl− concentrations, but factors determining local levels of cation-chloride cotransporters remain elusive. Here, we report that local abundance of the chloride importer NKCC1 and timely emergence of GABAergic inhibition are modulated by proteasome distribution, which is mediated through interactions of proteasomes with the adaptor Ecm29 and the axon initial segment (AIS) scaffold protein ankyrin G. Mechanistically, both the Ecm29 N-terminal domain and an intact AIS structure are required for transport and tethering of proteasomes in the AIS region. In mice, Ecm29 knockout (KO) in neurons increases the density of NKCC1 protein in the AIS region, a change that positively correlates with a delay in the GABAergic response switch. Phenotypically, Ecm29 KO mice showed increased firing frequency of action potentials at early postnatal ages and were hypersusceptible to chemically induced convulsive seizures. Finally, Ecm29 KO neurons exhibited accelerated AIS developmental positioning, reflecting a perturbed AIS morphological plastic response to hyperexcitability arising from proteasome inhibition, a phenotype rescued by ectopic Ecm29 expression or NKCC1 inhibition. Together, our findings support the idea that neuronal maturation requires regulation of proteasomal distribution controlled by Ecm29.
Quantum Scars in Microwave Dielectric Photonic Graphene Billiards*
Authors: Wang Xiao , Wei Guo-Dong
Published: January 2020

In the band structure of graphene, the dispersion relation is linear around a Dirac point at the corners of the Brillouin zone. The closed graphene system has proven to be the ideal model to investigate relativistic quantum chaos phenomena. The electromagnetic material photonic graphene (PG) and electronic graphene not only have the same structural symmetry, but also have the similar band structure. Thus, we consider a stadium shaped resonant cavity filled with PG to demonstrate the relativistic quantum chaos phenomenon by numerical simulation. It is interesting that the relativistic quantum scars not only are identified in the PG cavities, but also appear and disappear repeatedly. The wave vector difference between repetitive scars on the same orbit is analyzed and confirmed to follow the quantization rule. The exploration will not only demonstrate a visual simulation of relativistic quantum scars but also propose a physical system for observing valley-dependent relativistic quantum scars, which is helpful for further understanding of quantum chaos.
Electronic Structures and Thermoelectric Properties of ZnSb Doped with Cd and In from First Principles Calculations*
Authors: Zhou Kai , Zhang Ting , Liu Bin , Yao Yi-Jun
Published: January 2020

Thermoelectric properties of pure, Cd- and In-doped ZnSb are studied by first principles calculations of electronic structures and the semi-classical Boltzmann transport theory. The doping of Cd or In at the Zn lattice site slightly increases the lattice parameters due to the larger atomic radii of Cd and In compared with that of Zn. Cd or In doping also apparently increases the interatomic distances between the dopant atoms and the surrounding atoms. The power factor of n-type ZnSb is much larger than that of p-type ZnSb, indicating that n-type ZnSb has better thermoelectric performance than p-type ZnSb. After the doping of Cd or In, the power factor reduces mainly due to the decrease of the electrical conductivity. The temperature dependences of the Seebeck coefficient and the power factor of pure, Cd- and In-doped ZnSb are related to carrier concentrations.
Physical Properties of [A6Cl][Fe24Se26](A = K, Rb) with Self-Similar Structure*
Authors: Wang Shaohua , Yin Qiangwei , Lei Hechang
Published: January 2020

We have successfully synthesized two novel compounds [A
6Cl][Fe24Se26] (A = K, Rb). The key structural units of them are FeSe octamers, consisting of edge-shared FeSe4 tetrahedra. Two kinds of FeSe octamer layers with different connection configurations stack along the c axis, forming a three-dimensional (3D) TiAl3-type structure. Interestingly, the 3D structural topology of these ocatmers in one unit cell is similar to the local atomic arrangement of themselves, i.e., self-similarity in structure. Physical property characterizations indicate that both the compounds exhibit insulating antiferromagnetism with Neel temperatures T
N ∼ 110 K and 75 K for [K6Cl][Fe24Se26] and [Rb6Cl][Fe24Se26].
Superconductivity, Pair Density Wave, and Néel Order in Cuprates*
Authors: Chen Li-Han , Wang Da , Zhou Yi , Wang Qiang-Hua
Published: January 2020

We investigate in underdoped cuprates possible coexistence of the superconducting order at zero momentum and pair density wave (PDW) at momentum
Q
= (π, π) in the presence of a Néel order. By symmetry, the d-wave uniform singlet pairing dS
0 can coexist with the d-wave triplet PDW dT

Q
, and the p-wave singlet PDW p

Q

can coexist with the p-wave uniform triplet pT
0. At half filling, we find that the novel pS

Q
+ pT
0 state is energetically more favorable than the dS
0 + dT

Q

state. At finite doping, however, the dS
0 + dT

Q

state is more favorable. In both types of states, the variational triplet parameters dT

Q

and pT
0 are of secondary significance. Our results point to a fully symmetric Z2 quantum spin liquid with spinon Fermi surface in proximity to the Néel order at zero doping, which may not be adiabatically connected to the d-wave singlet superconductivity at finite doping with intertwining d-wave triplet PDW fluctuations and spin moment fluctuations. The results are obtained by variational quantum Monte Carlo simulations.
Quantum signatures in the quantum Carnot cycle
Authors: Dann Roie , Kosloff Ronnie
Published: January 2020

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

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.
Electrohydrodynamic behaviors of droplet under a uniform direct current electric field*
Authors: Deng Zi-Long , Sun Mei-Mei , Yu Cheng
Published: January 2020

The electrohydrodynamic behaviors and evolution processes of silicone oil droplet in castor oil under uniform direct current (DC) electric field are visually observed based on a high-speed microscopic platform. Subsequently, the effects of different working conditions, such as electric field strength, droplet size, etc., on droplet behaviors are roundly discussed. It can be found that there are four droplet behavior modes, including Taylor deformation, typical oblique rotation, periodic oscillation, and fracture, which change with the increase of electric field strength. It is also demonstrated that the degree of flat ellipse deformation gets larger under a stronger electric field. Moreover, both of the stronger electric field and smaller droplet size lead to an increase in the rotation angle of the droplet.
The optical nonreciprocal response based on a four-mode optomechanical system
Authors: Wang Jing
Published: January 2020

We propose a scheme for realizing the optical nonreciprocal response based a four-mode optomechanical system, consisting of two charged mechanical modes and two linearly coupled optical modes. Two charged mechanical modes are coupled by Coulomb interaction, and two optical modes are coupled to one of mechanical modes by radiation pressure. We numerically evaluate the transmission probability of the probe field to obtain the optimum optical nonreciprocal response parameters. Also, we show that the optical nonreciprocal response is caused by the quantum interference between the optomechanical couplings and the linearly coupled interaction that breaks the time-reversal symmetry.
Multi-bubble motion behavior of uniform magnetic field based on phase field model*
Authors: Zhu Chang-Sheng , Hu Zhen , Wang Kai-Ming
Published: January 2020

Aiming at the interaction and coalescence of bubbles in gas–liquid two-phase flow, a multi-field coupling model was established to simulate deformation and dynamics of multi-bubble in gas–liquid two-phase flow by coupling magnetic field, phase field, continuity equation, and momentum equation. Using the phase field method to capture the interface of two phases, the geometric deformation and dynamics of a pair of coaxial vertical rising bubbles under the applied uniform magnetic field in the vertical direction were investigated. The correctness of results is verified by mass conservation method and the comparison of the existing results. The results show that the applied uniform magnetic field can effectively shorten the distance between the leading bubble and the trailing bubble, the time of bubbles coalescence, and increase the velocity of bubbles coalescence. Within a certain range, as the intensity of the applied uniform magnetic field increases, the velocity of bubbles coalescence is proportional to the intensity of the magnetic field, and the time of bubbles coalescence is inversely proportional to the intensity of the magnetic field.
Eigenvalue spectrum analysis for temporal signals of Kerr optical frequency combs based on nonlinear Fourier transform*
Authors: Wang Jia , Sheng Ai-Guo , Huang Xin , Li Rong-Yu , He Guang-Qiang
Published: January 2020

Based on the nonlinear Schrödinger equation (NLSE) with damping, detuning, and driving terms describing the evolution of signals in a Kerr microresonator, we apply periodic nonlinear Fourier transform (NFT) to the study of signals during the generation of the Kerr optical frequency combs (OFCs). We find that the signals in different states, including the Turing pattern, the chaos, the single soliton state, and the multi-solitons state, can be distinguished according to different distributions of the eigenvalue spectrum. Specially, the eigenvalue spectrum of the single soliton pulse is composed of a pair of conjugate symmetric discrete eigenvalues and the quasi-continuous eigenvalue spectrum with eye-like structure. Moreover, we have successfully demonstrated that the number of discrete eigenvalue pairs in the eigenvalue spectrum corresponds to the number of solitons formed in a round-trip time inside the Kerr microresonator. This work shows that some characteristics of the time-domain signal can be well reflected in the nonlinear domain.
High-contrast imaging based on wavefront shaping to improve low signal-to-noise ratio photoacoustic signals using superpixel method*
Authors: Lv Xinjing , Xu Xinyu , Feng Qi , Zhang Bin , Ding Yingchun , Liu Qiang
Published: January 2020

Photoacoustic (PA) imaging has drawn tremendous research interest for various applications in biomedicine and experienced exponential growth over the past decade. Since the scattering effect of biological tissue on ultrasound is two- to three-orders magnitude weaker than that of light, photoacoustic imaging can effectively improve the imaging depth. However, as the depth of imaging further increases, the incident light is seriously affected by scattering that the generated photoacoustic signal is very weak and the signal-to-noise ratio (SNR) is quite low. Low SNR signals can reduce imaging quality and even cause imaging failure. In this paper, we proposed a new wavefront shaping and imaging method of low SNR photoacoustic signal using digital micromirror device (DMD) based superpixel method. We combined the superpixel method with DMD to modulate the phase and amplitude of the incident light, and the genetic algorithm (GA) was used as the wavefront shaping algorithm. The enhancement of the photoacoustic signal reached 10.46. Then we performed scanning imaging by moving the absorber with the translation stage. A clear image with contrast of 8.57 was obtained while imaging with original photoacoustic signals could not be achieved. The proposed method opens new perspectives for imaging with weak photoacoustic signals.
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

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

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

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

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

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

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

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

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

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

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.
Modeling of human flows during a fire
Authors: Parfyenenko A
Published: January 2020

Models of human flows and their influence on spacial arrangement of buildings and facilities are considered. A review of simulation programs for people evacuation procedure in the event of fire was performed. Advices on using of human flow models in standardization of escape routes are provided.
Microwave unit for heat treatment of building materials
Authors: Vorotyntseva Irina
Published: January 2020

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

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

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

At 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

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

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

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

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

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.