bluuebunny/crossref_metadata_2025 huggingface dataset:
Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation
Authors: Kannan Rangasayee , Wang Yiyu , Poplawsky Jonathan , Babu Sudarsanam Suresh , Li Leijun
Published: April 2019

Atom probe tomography (APT) has been used to understand the redistribution of solutes during the isothermal cascading phase transformations from supersaturated austenite resulting in the formation of inverse bainite. Different cascading reactions resulting in the formation of inverse bainite, namely the cementite midrib formation, ferrite formation, secondary cementite formation, and the degenerated microstructure of inverse bainite have been studied in detail. Solute profiles across the different transformation interfaces indicate Negligible Partitioning Local Equilibrium (NPLE) type growth kinetics for cementite midrib, whereas a transition in growth kinetics from Para Equilibrium (PE) to Negligible Partitioning Local Equilibrium (NPLE) is observed for secondary cementite and ferrite transformation. The results provide a strong indication that the inverse bainitic transformation occurs as a consequence of individual cascading phase transformations starting from parent austenite, and the transformation of inverse bainite occurs in a similar manner to Widmanstatten ferrite/bainitic ferrite with carbon diffusion-controlled growth, and without any reconstructive or long-range diffusion of substitutional solutes.
The new nano-enabled phase map of ZrO2-Al2O3
Authors: Koltsov Iwona , Kimmel Giora , Stelmakh Svitlana , Sobczak Kamil , Lojkowski Witold
Published: April 2019

Rapid development of nanotechnology often requires verification of existing phase diagrams, which were suitable for bulk materials. This work presents a new phase map (phase diagram) for Al2O3-ZrO2 crystalline powders including the role of the nanoscale particles. Al2O3-ZrO2 composites are relevant for industry for applications demanding high hardness. The nanopowders were manufactured via co-precipitation process followed by microwave hydrothermal synthesis (MHS) at 270 °C, drying at room temperature and annealing in the temperature range 300–1500 °C. The phase composition was investigated using X-ray diffraction (XRD) and Rietveld refinement analysis. The grain size and size distribution were calculated using Rietveld refinement analysis and using transmission electron microscopy (TEM). A particular feature of the composites was the nanoisolation, separation of different phases on a nanoscale. This feature limited grain growth during annealing and permitted the phase diagram for a nano-enabled system to be determined, which turned out to be different from that of conventional composites. In particular, considerable solubility of Al3+ in ZrO2 was found for temperatures less than 1000 °C.
When the statistical MMN meets the physical MMN
Authors: Tsogli Vera , Jentschke Sebastian , Daikoku Tatsuya , Koelsch Stefan
Published: April 2019

How do listeners respond to prediction errors within patterned sequence of sounds? To answer this question we carried out a statistical learning study using electroencephalography (EEG). In a continuous auditory stream of sound triplets the deviations were either (a) statistical, in terms of transitional probability, (b) physical, due to a change in sound location (left or right speaker) or (c) a double deviants, i.e. a combination of the two. Statistical and physical deviants elicited a statistical mismatch negativity and a physical MMN respectively. Most importantly, we found that effects of statistical and physical deviants interacted (the statistical MMN was smaller when co-occurring with a physical deviant). Results show, for the first time, that processing of prediction errors due to statistical learning is affected by prediction errors due to physical deviance. Our findings thus show that the statistical MMN interacts with the physical MMN, implying that prediction error processing due to physical sound attributes suppresses processing of learned statistical properties of sounds.
3D Synthetic Peptide-based Architectures for the Engineering of the Enteric Nervous System
Authors: Brun Paola , Zamuner Annj , Peretti Alessandro , Conti Jessica , Messina Grazia M. L. , Marletta Giovanni , Dettin Monica
Published: April 2019

Damage of enteric neurons and partial or total loss of selective neuronal populations are reported in intestinal disorders including inflammatory bowel diseases and necrotizing enterocolitis. To develop three-dimensional scaffolds for enteric neurons we propose the decoration of ionic-complementary self-assembling peptide (SAP) hydrogels, namely EAK or EAbuK, with bioactive motives. Our results showed the ability of EAK in supporting neuronal cell attachment and neurite development. Therefore, EAK was covalently conjugated to: RGD, (GRGDSP)4K (fibronectin), FRHRNRKGY (h-vitronectin, named HVP), IKVAV (laminin), and type 1 Insulin-like Growth Factor (IGF-1). Chemoselective ligation was applied for the SAP conjugation with IGF-1 and the other longer sequences. Freshly isolated murine enteric neurons attached and grew on all functionalized EAK but IGF-1. Cell-cell contact was evident on hydrogels enriched with (GRGDSP)4K and HVP. Moreover (GRGDSP)4K significantly increased mRNA expression of neurotrophin-3 and nerve growth factor, two trophic factors supporting neuronal survival and differentiation, whereas IKVAV decoration specifically increased mRNA expression of acetylcholinesterase and choline acetyltransferase, genes involved in synaptic communication between cholinergic neurons. Thus, decorated hydrogels are proposed as injectable scaffolds to supportin locosurvival of enteric neurons, foster synaptic communication, or drive the differentiation of neuronal subtypes.
Potential premalignant status of gastric portion excluded after Roux en-Y gastric bypass in obese women: A pilot study
Authors: Ravacci Graziela Rosa , Ishida Robson , Torrinhas Raquel Suzana , Sala Priscila , Machado Natasha Mendonça , Fonseca Danielle Cristina , André Baptista Canuto Gisele , Pinto Ernani , Nascimento Viviane , Franco Maggi Tavares Marina , Sakai Paulo , Faintuch Joel , Santo Marco Aurelio , Moura Eduardo Guimarães Hourneaux , Neto Ricardo Artigiani , Logullo Angela Flávia , Waitzberg Dan Linetzky
Published: April 2019

We evaluated whether the excluded stomach (ES) after Roux-en-Y gastric bypass (RYGB) can represent a premalignant environment. Twenty obese women were prospectively submitted to double-balloon enteroscopy (DBE) with gastric juice and biopsy collection, before and 3 months after RYGB. We then evaluated morphological and molecular changes by combining endoscopic and histopathological analyses with an integrated untargeted metabolomics and transcriptomics multiplatform. Preoperatively, 16 women already presented with gastric histopathological alterations and an increased pH (≥4.0). These gastric abnormalities worsened after RYGB. A 90-fold increase in the concentration of bile acids was found in ES fluid, which also contained other metabolites commonly found in the intestinal environment, urine, and faeces. In addition, 135 genes were differentially expressed in ES tissue. Combined analysis of metabolic and gene expression data suggested that RYGB promoted activation of biological processes involved in local inflammation, bacteria overgrowth, and cell proliferation sustained by genes involved in carcinogenesis. Accumulated fluid in the ES appears to behave as a potential premalignant environment due to worsening inflammation and changing gene expression patterns that are favorable to the development of cancer. Considering that ES may remain for the rest of the patient’s life, long-term ES monitoring is therefore recommended for patients undergoing RYGB.
Mesoporous halloysite nanotubes modified by CuFe2O4 spinel ferrite nanoparticles and study of its application as a novel and efficient heterogeneous catalyst in the synthesis of pyrazolopyridine derivatives
Authors: Maleki Ali , Hajizadeh Zoleikha , Salehi Peyman
Published: April 2019

In this study, mesoporous halloysite nanotubes (HNTs) were modified by CuFe2O4 nanoparticles for the first time. The morphology, porosity and chemistry of the CuFe2O4@HNTs nanocomposite were fully characterized by Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM) image, transmission electron microscope (TEM) images, energy-dispersive X-ray (EDX), X-ray diffraction (XRD) pattern, Brunauer-Emmett-Teller (BET) adsorption-desorption isotherm, thermogravimetric (TG) and vibrating sample magnetometer (VSM) curve analyses. The results confirmed that CuFe2O4 with tetragonal structure, uniform distribution, and less agglomeration was located at HNTs. CuFe2O4@HNTs nanocomposite special features were high thermal stability, crystalline structure, and respectable magnetic property. SEM and TEM results showed the nanotube structure and confirmed the stability of basic tube in the synthetic process. Also, inner diameters of tubes were increased in calcination temperature at 500 °C. A good magnetic property of CuFe2O4@HNTs led to use it as a heterogeneous catalyst in the synthesis of pyrazolopyridine derivatives. High efficiency, green media, mild reaction conditions and easily recovery of the nanocatalyst are some advantages of this protocol.
Mechanochemical synthesis of 0D and 3D cesium lead mixed halide perovskites
Authors: Karmakar Abhoy , Dodd Mya S. , Zhang Xiaoyue , Oakley Meagan S. , Klobukowski Mariusz , Michaelis Vladimir K.
Published: April 2019

A simplified mechanochemical synthesis approach for Cs-containing mixed halide perovskite materials of lower and higher dimensionality (0D and 3D, respectively) is presented with stoichiometric control from their halide salts, CsX and PbX2 (X = Cl, Br, I).
In situ synthesis, stabilization and activity of protein-modified gold nanoparticles for biological applications
Authors: Garcia-Hernandez Celia , Freese Allison K. , Rodriguez-Mendez Maria L. , Wanekaya Adam K.
Published: April 2019

We demonstrate an in situ synthesis, stabilization and activity of a nanoparticle-based protein carrier platform via the Layer-by-Layer (LbL) technology.
Controlled chiral arrangement of silver nanoparticles in supramolecular gels modulated by the cooling rate
Authors: Wang Rong , Cui Jiaxi , Wan Xinhua , Zhang Jie
Published: April 2019

Opposite helical arrangements of silver nanoparticles can be in situ achieved in organogels from a single gelator at different cooling rates.
A near-infrared I emissive dye: toward the application of saturable absorber and multiphoton fluorescence microscopy in the deep-tissue imaging window
Authors: Ren Can , Deng Xiangquan , Hu Wenbo , Li Junzi , Miao Xiaofei , Xiao Shuyu , Liu Hongji , Fan Quli , Wang Ke , He Tingchao
Published: April 2019

A boron-dipyrromethene (BODIPY) dye emitting in the near-infrared (NIR) I region (723 nm) exhibits strong saturable absorption at 680 nm and excellent three-photon fluorescence imaging in the NIR II (1665 nm) window.
Nitranilic acid as a basis for construction of coordination polymers: from discrete monomers to 3D networks
Authors: Milašinović Valentina , Molčanov Krešimir
Published: April 2019

Six novel transition metal complexes of nitranilic acid, a highly versatile ligand, were studied. Topologies of coordination polymers ranging from 0D (discrete monomers) to 3D were observed.
The mechanism and rate constants for oxidation of indenyl radical C9H7 with molecular oxygen O2: a theoretical study
Authors: Ghildina A. R. , Porfiriev D. P. , Azyazov V. N. , Mebel A. M.
Published: April 2019

A theoretical study reveals the reaction mechanism of oxidation of the indenyl radical with molecular oxygen forming predominantly 1-H-inden-1-one + H under combustion conditions.
Functional properties of donor- and acceptor-co-doped high dielectric constant zinc oxide ceramics
Authors: Silva Raphael Lucas de Sousa e , Banerjee Prasun , Franco Júnior Adolfo
Published: April 2019

In this work we investigated the functional properties of a set of acceptor (Cu1+) and donor (Gd3+) codoped wurtzite ZnO ceramics Zn(1−x)(CuzGdy)xO for x = 0.01 synthesized by the pressure-less solid state sintering method.
The use of a sucrose precursor to prepare a carbon membrane for the separation of hydrogen from methane
Authors: Alomair Abdulaziz , Alqaheem Yousef , Holmes Stuart M.
Published: April 2019

Development of an easier and less time-consuming technique to fabricate carbon membranes for the separation of H2 and CH4 using sucrose precursor.
MXenes with tunable work functions and their application as electron- and hole-transport materials in non-fullerene organic solar cells
Authors: Yu Zhimeng , Feng Wei , Lu Wanheng , Li Bichen , Yao Hongyan , Zeng Kaiyang , Ouyang Jianyong
Published: April 2019

The work function of 2D Ti3C2Tx can be tuned in a range from 4.08 to 4.95 eV.
Ultrafast humidity-responsive structural colors from disordered nanoporous titania microspheres
Authors: Mohd-Noor Syazwani , Jang Hansol , Baek Kyungnae , Pei Yi-Rong , Alam Al-Mahmnur , Kim Yong Hwan , Kim In Soo , Choy Jin-Ho , Hyun Jerome K.
Published: April 2019

Ultrafast and reversible colorimetric responses to humidity changes are observed with disordered, nanoporous titania microspheres, optimized in speed and intensity with a monolayer coverage. The response times, defined by intracrystalline diffusion of water molecules, represent the fastest values for colorimetric humidity sensors.
Ultrafast post-synthetic modification of a pillared cobalt(ii)-based metal–organic framework via sulfurization of its pores for high-performance supercapacitors
Authors: Abazari Reza , Sanati Soheila , Morsali Ali , Slawin Alexandra M. Z. , Carpenter-Warren Cameron L. , Chen Wei , Zheng Anmin
Published: April 2019

In this study, a fast and simple technique (2 min) has been developed to modify the pores of a novel micro-porous, amide-functionalized Co(ii)-based MOF [Co(oba)2(bpfb)4](DMF)2, TMU-61, (H2oba = 4,4′-oxybis(benzoic acid) and bpfb = N,N′-bis-(4-pyridylformamide)-1,4-benzenediamine).
ZnO/g-GeC van der Waals heterostructure: novel photocatalyst for small molecule splitting
Authors: Gao Xu , Shen Yanqing , Ma Yanyan , Wu Shengyao , Zhou Zhongxiang
Published: April 2019

First principles calculations by PBE and hybrid HSE06 functional are performed to explore the electronic properties and photocatalytic performances of ZnO/graphene-like (g-GeC) vdWHs.
Kinetic condition driven phase and vacancy enhancing thermoelectric performance of low-cost and eco-friendly Cu2−xS
Authors: Liu Wei-Di , Shi Xiao-Lei , Gao Han , Moshwan Raza , Xu Sheng-Duo , Wang Yuan , Yang Lei , Chen Zhi-Gang , Zou Jin
Published: April 2019

Cu2−xS pellets sintered from powders synthesized with different NaOH amounts have different phase compositions and average Cu vacancy levels. This has subsequently led to enhanced thermoelectric performance due to both enhanced hole concentration and reduced phase transition temperature.
White light emission in low-dimensional perovskites
Authors: Cortecchia Daniele , Yin Jun , Petrozza Annamaria , Soci Cesare
Published: April 2019

Structural properties closely affect the photophysical processes underlying photoluminescence broadening and white-light emission in low-dimensional perovskites.
A case study of tuning the crystal polymorphs of organic semiconductors towards simultaneously improved light emission and field-effect properties
Authors: Liu Dan , Li Chenguang , Niu Shujie , Li Yang , Hu Mengxiao , Li Qingyuan , Zhu Weigang , Zhang Xiaotao , Dong Huanli , Hu Wenping
Published: April 2019

Simultaneously improved light emission and field-effect performance were achieved for an anthracene derivative, 1,4-di(anthracen-9-yl)buta-1,3-diyne (DABD) in its β-phase crystals, suggesting their potential applications in integrated optoelectronic devices.
Novel long-chain neurotoxins from Bungarus candidus distinguish the two binding sites in muscle-type nicotinic acetylcholine receptors
Authors: Utkin Yuri N. , Kuch Ulrich , Kasheverov Igor E. , Lebedev Dmitry S. , Cederlund Ella , Molles Brian E. , Polyak Iakov , Ivanov Igor A. , Prokopev Nikita A. , Ziganshin Rustam H. , Jornvall Hans , Alvelius Gunvor , Chanhome Lawan , Warrell David A. , Mebs Dietrich , Bergman Tomas , Tsetlin Victor I.
Published: April 2019

αδ-Bungarotoxins, a novel group of long-chain α-neurotoxins, manifest different affinity to two agonist/competitive antagonist binding sites of muscle-type nicotinic acetylcholine receptors (nAChRs), being more active at the interface of α–δ subunits. Three isoforms (αδ-BgTx-1–3) were identified in Malayan Krait (Bungarus candidus) from Thailand by genomic DNA analysis; two of them (αδ-BgTx-1 and 2) were isolated from its venom. The toxins comprise 73 amino acid residues and 5 disulfide bridges, being homologous to α-bungarotoxin (α-BgTx), a classical blocker of muscle-type and neuronal α7, α8, and α9α10 nAChRs. The toxicity of αδ-BgTx-1 (LD50 = 0.17–0.28 µg/g mouse, i.p. injection) is essentially as high as that of α-BgTx. In the chick biventer cervicis nerve–muscle preparation, αδ-BgTx-1 completely abolished acetylcholine response, but in contrast with the block by α-BgTx, acetylcholine response was fully reversible by washing. αδ-BgTxs, similar to α-BgTx, bind with high affinity to α7 and muscle-type nAChRs. However, the major difference of αδ-BgTxs from α-BgTx and other naturally occurring α-neurotoxins is that αδ-BgTxs discriminate the two binding sites in the Torpedo californica and mouse muscle nAChRs showing up to two orders of magnitude higher affinity for the α–δ site as compared with α–ε or α–γ binding site interfaces. Molecular modeling and analysis of the literature provided possible explanations for these differences in binding mode; one of the probable reasons being the lower content of positively charged residues in αδ-BgTxs. Thus, αδ-BgTxs are new tools for studies on nAChRs.
Fluoxetine suppresses inflammatory reaction in microglia under OGD/R challenge via modulation of NF-κB signaling
Authors: Tian Mouli , Yang Mei , Li Zhenjie , Wang Yiru , Chen Wei , Yang Liye , Li Yonghua , Yuan Hongbin
Published: April 2019

We aimed to investigate the anti-inflammatory role of fluoxetine, a selective serotonin reuptake inhibitor, in microglia (MG) and the mechanisms under oxygen glucose deprivation/reoxygenation (OGD/R). An OGD/R model on BV-2 cells was used for the study of microglia under ischemia/reperfusion injury in ischemic stroke. Lentiviral transfection was applied to knock down IκB-α. Enzyme-linked immunosorbent assay (ELISA) was used for detecting levels of TNF-α, IL-1β, and IL-6, and real-time PCR was used to assess the expression of IκB-α protein. Western blotting was applied to analyze NF-κB-signaling related proteins and Cell Counting Kit-8 (CCK-8) was used for assessing cell viability. Molecular docking and drug affinity responsive target stability (DARTS) assay were used for the detection of the interaction between IκB-α and fluoxetine. We found that fluoxetine decreased the levels of TNF-α, IL-1β, and IL-6 in supernatant as well as NF-κB subunits p65 and p50 in BV-2 cells under OGD/R. Fluoxetine significantly increased the level of IκB-α through the inhibition of IκB-α ubiquitylation and promoted the bonding of IκB-α and fluoxetine in BV-2 cells under OGD/R. Knocking down IκB-α attenuated the decreasing effect of TNF-α, IL-1β, and IL-6 as well as p65 and p50 in BV-2 cells under OGD/R led to by fluoxetine. In conclusion, our present study demonstrated the anti-inflammatory role of fluoxetine and its mechanisms related to the modulation of NF-κB-related signaling in MG under ischemia/reperfusion challenge.
Reading in Arabic: How Well Does the Standard Model Apply?
Authors: Tibi Sana , Kirby John R.
Published: April 2019

Purpose

We investigated the cognitive and linguistic processes that underlie reading in Arabic in relation to a well-defined theoretical framework of reading and the factors that underlie reading.

Method

The sample was 201 (101 boys, 100 girls) 3rd-grade Arabic-speaking children. Children were administered measures of Vocabulary, Phonological Awareness (PA), Naming Speed, Orthographic Processing, Morphological Awareness (MA), Memory, Nonverbal Ability, and 5 reading outcomes. Hierarchical regression analyses were conducted for each of the 5 reading outcomes to investigate the predictors of children's reading.

Results

Each of the constructs explained unique variance when added to the model. In the final models, PA was the strongest predictor of all outcomes, followed by MA. In a follow-up analysis, participants were divided into good and poor decoders, based on their Pseudoword Reading scores. Good decoders outscored poor decoders on every measure. Within-group regression analyses indicated that poor decoders relied on more component processes than good decoders, suggesting a lack of automaticity. Variance in reading outcomes was better predicted for poor decoders than for good decoders.

Conclusion

These results indicate that standard predictors apply well to Arabic, showing the particular importance of PA and MA. Longitudinal and instructional studies are required to determine developmental patterns and ways to improve reading performance.
Flash ADC‐based digital LDO with non‐linear decoder and exponential‐ratio array
Authors: Ding Zhendong , Xu Xinyu , Song Haixin , Rhee Woogeun , Wang Zhihua
Published: April 2019

This Letter presents a digital low‐dropout regulator (LDO) that achieves fast transient response with a flash ADC‐based parallel comparison. A non‐linear decoder is employed in the flash ADC to further enhance the transient response. In the design of the power switch array, an exponential‐ratio array (ERA) is adopted for high load driving capacity. The proposed digital LDO implemented in 65‐nm CMOS achieves a load range of 0.04–82.7 mA when the input voltage and the output voltage are 1.0 and 0.9 V, respectively. The digital LDO achieves a settling time of 6 μs with a load step of 48 mA, exhibiting the state‐of‐the‐art normalised settling time for the clock frequency of 1 MHz.
Low surface damage during ohmic contact formation in AlGaN/GaN HEMT by selective laser annealing
Authors: Hou Mingchen , Xie Gang , Sheng Kuang
Published: April 2019

The formation of ohmic contact in AlGaN/GaN high electron mobility transistor (HEMT) with low surface damage by selective laser annealing is reported. With selective laser annealing, the device exhibits a smaller sheet resistance, which is 74.9% of the device with the conventional rapid thermal annealing process. The dynamic ON‐resistance is 1.35 times higher than the static ON‐resistance after off‐state drain voltage stress of 200 V, which benefits from the low surface defects using laser annealing. While the dynamic ON‐resistance with rapid thermal annealing shows 8.66 times higher than the static ON‐resistance after off‐state drain voltage stress of 125 V. X‐ray photoelectron spectroscopy analysis indicates that the AlGaN surface damage related to the oxidation reaction under the high‐temperature condition is eliminated by using selective laser annealing, even in the air ambient.
Adaptive dynamic surface longitudinal tracking control of autonomous vehicles
Authors: Guo Jinghua , Luo Yugong , Li Keqiang , Guo Lie
Published: April 2019

Autonomous vehicles offer the opportunity of significant benefits to social life, such as improving safety, reducing crashes, decreasing fuel consumption and so on. This study presents a novel adaptive dynamic surface longitudinal tracking control strategy for autonomous vehicles to deal with the effects of non‐linearities and parametric uncertainties of vehicles. First, a longitudinal vehicle model, which can describe the features of non‐linear and external disturbances of autonomous vehicles, is established. Then, an adaptive dynamic surface longitudinal control system is proposed to avoid the explosion of complexity. In addition, an adaptive estimated approach based on neural networks technique is designed to approximate the model uncertainties of autonomous vehicles. The stability of the proposed adaptive control system is discussed by the Lyapunov theory. It has been illustrated for both simulation and experimental tests that the proposed adaptive control system has a remarkable longitudinal tracking performance of the autonomous vehicle.
Interaction of quantum systems with environment in QCD
Authors: Kuvshinov Viatcheslav , Shaparau Valery , Bagashov Eugene
Published: April 2019

It is shown that the interaction of quark with the stochastic vacuum of QCD (considered as an environment) leads to the decoherence of quark colour state, associated with the loss of information on the initial quark colour. We propose to consider this process as a reason of the confinement of the quark colour. Asymptotically this leads to confined quarks (fully mixed colourless quark states) in the limit of large distances and time intervals (confinement region) and free coloured quarks in the limit of small distances and time intervals (asymptotic freedom).

We propose quantitative characteristics that allow to describe the process of interaction: purity, fidelity, von Neumann entropy, quantum information measure. The cases of two and arbitrary number of quarks are considered, and it is shown that the entanglement in such system disappears in the limit of large distances and time intervals. The process is in good agreement with the known theorems in quantum information theory (no-cloning and no-hiding).

We study non-perturbative evolution of the gluon colour states during short time. Fluctuations of gluons are less than those for coherent states. This fact suggests that there gluon squeezed states can arise. Theoretical justification for the occurrence both singe- and two-mode gluon squeezing effects in QCD is given.

We show that gluon entangled states which are closely related with two-mode squeezed states of gluon fields can appear at short time non-perturbative evolution by analogy with corresponding photon states in quantum optics.
Nucleon structure studies with the PANDA experiment at FAIR
Authors: Dbeyssi Alaa
Published: April 2019

The PANDA experiment is one of the major projects in preparation at the upcoming FAIR facility in Darmstadt, Germany. A multipurpose high energy physics detector is currently under construction and will be operated at the High Energy Storage Ring of FAIR. High intensity antiproton beams will be available in the momentum range between 1.5 GeV/c and 15 GeV/c and will allow to address a broad physics program including hadron spectroscopy, study of charm and strangeness in nuclei, hypernuclear physics and other QCD topics. In addition, the PANDA experiment will offer unique possibilities to investigate the structure of the proton using different electromagnetic processes. In this contribution, the PANDA physics program related to the nucleon structure aspects is discussed. Feasibility studies of electromagnetic processes for the measurements of proton electromagnetic form factors in the time-like region and the nucleon-to-meson transition distribution amplitudes at PANDA, are reported.
Recent results of strong interaction program from NA61/SHINE experiment at CERN SPS
Authors: Melkumov Georgy
Published: April 2019

The NA61/SHINE experiment at the CERN SPS pursues a rich program of strong interactions. The main physics goals of this program are the study of properties of the onset of deconfinement and search for the signatures of the critical point of strongly interacting matter by performing the two-dimensional scan in a broad region of energy (beam momentum 13A-158A GeV/c) and system size (p+p, Be+Be, Ar+Sc and Xe+La).

Recent NA61/SHINE results on particle spectra and event-by-event fluctuations in p+p, Be+Be and Ar+Sc collisions are shown with emphasis on the measurements of particle ratios, namely of pion a strangeness production, multiplicity fluctuations versus energy and the system size of colliding nuclei.

It will be shown that the hadron production properties in heavy ion collisions which change rapidly in the low SPS energy domain and are interpreted as the beginning of quark-gluon plasma production – onset of deconfinement could be also the case in inelastic p+p interactions and probably in Be+Be collisions.

The paper presents a selection of NA61/SHINE results on particle production properties discussed together with existing data from the NA49 collaboration. The evolution of non-monotonic structures in the pion and strangeness production as a function of the system size and energy is addressed. The rapid change of hadron production properties from p+p and Be+Be up to Ar+Sc and Pb+Pb collisions can be interpreted as the beginning of the large clusters formation of strongly interacting matter - the onset of fireball.

The NA61/SHINE strong interaction programme is presented including the recent status on proton intermittency analysis and strongly intensive fluctuation observables of particle multiplicity and transverse momentum.
Semi-inclusive deep inelastic scattering in Wandzura-Wilczek-type approximation
Authors: Bastami S. , Avakian H. , Efremov A. V. , Kotzinian A. , Musch B. U. , Parsamyan B. , Prokudin A. , Schlegel M. , Schnell G. , Schweitzer P. , Tezgin K.
Published: April 2019

We present the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed O(1/Q2) terms in the Wandzura–Wilczek-type approximation which consists in systematically assuming that q̅gq–terms are much smaller than q̅q–correlators. We compute all twist-2 and twist-3 structure functions and the corresponding asymmetries, and discuss the applicability of the Wandzura–Wilczek-type approximations on the basis of available data. We make predictions that can be tested by data from Jefferson Lab, COMPASS, HERMES, and the future Electron-Ion Collider. The results of this paper can be readily used for phenomenology and for event generators, and will help to improve our understanding of the TMD theory beyond leading twist. For more details see [1] or slides of Anatoly Efremov talk at https://indico.jinr.ru/getFile.py/access?contribId=25&sessionId=15&resId=0&materialId=slides&confId=433.
Analytical description of hadron production in hadron-hadron and nuclear-nuclear collisions in the mid-rapidity region
Authors: Malakhov Alexander , Lykasov Gennady
Published: April 2019

It is shown that the inclusive spectra of the produced hadrons in hadron-hadron and nuclear-nuclear collisions can be presented as the universal function dependent of the self-similarity parameter in the analytical form. The article gives a description of the self-similarity parameter depending on the rapidity in the mid-rapidity region. The experimental data are in good agreement with the results of our calculations in a wide energy range from a few GeV to a few TeV in the central rapidity region.
High-precision numerical estimates of the Mellin-Barnes integrals for the structure functions based on the stationary phase contour
Authors: Sidorov Alexander , Solovtsova Olga , Lashkevich Vasil
Published: April 2019

We present a recipe for constructing the effcient contour which allows one to calculate with high accuracy the Mellin-Barnes integrals, in particular, for the F3 structure function written in terms of its Mellin moments. We have demonstrated that the contour of the stationary phase arising for the F3 structure function tends to the finite limit as Re(z) → –∞. We show that the Q2 evolution of the structure function can be represented as an integral over the contour of the stationary phase within the framework of the Picard-Lefschetz theory. The universality of the asymptotic contour of the stationary phase defined at some fixed value of the momentum transfer square $Q_{0}^{2}$ for calculations with any Q2 is shown.
Recent developments in particle yield fluctuation measurements
Authors: Altsybeev Igor
Published: April 2019

In relativistic heavy-ion collisions, properties of the initial state and effects arising during evolution of the medium, such as a transition between the hadronic and partonic phases, should reflect themselves in event-by-event fluctuations of the number of produced particles. In this paper, recentmeasurements of several event-by-event observables, namely, dynamical fluctuations of relative particle yields and forwardbackward correlations of different types, are discussed. Also, new observables for forward-backward correlation studies are proposed: correlations between ratios of identified particle yields in two separated acceptance intervals and the correlation between the ratio in one interval and average transverse momentum in another.
Nonextensive statistics of Landsberg-Vedral entropy
Authors: Parvan A.S.
Published: April 2019

The general formalism for the nonextensive statistics based on the Landsberg-Vedral parametric entropy in the framework of the microcanonical, canonical and grand canonical ensembles was derived. The formulas for the first law of thermodynamics and the thermodynamic quantities in the terms of ensemble averages were obtained in a general form. It was found that under the transformation q → 2 – q the probabilities of microstates of the nonextensive statistics based on the Landsberg-Vedral entropy with the standard expectation values formally resemble the corresponding probabilities of the Tsallis statistics with the generalized expectation values.
Recent flow and femtoscopy results from STAR
Authors: Nigmatkulov Grigory
Published: April 2019

Azimuthal anisotropy and femtoscopic measurements provide information about collectivity and dynamics of the created medium. Data from the BES enables STAR to search for the turn-on/off signatures of the Quark-Gluon Plasma (QGP), for the first-order phase transition, and to constrain various models. In midcentral collisions, the proton and net-proton slope parameter (dυ1=dy|y=0) shows a minimum between $$\sqrt {{s_{NN}}} = 11.5$$ and 19.6 GeV. The pion and kaon femtoscopic radii are also measured as a function of transverse mass (mT ), centrality and collision energy, and showing that the system at high energies lives longer.
Impact of average neutron energy on the fast neutron fluency measurement by Np237 fission to capture ratio and reverse dark current of planar silicon detector methods
Authors: Szuta M. , Kilim S. , Strugalska-Gola E. , Bielewicz M. , Zamyatin N.I. , Shafronowskaya A.I. , Tyutyunnikov S. , Milewicz-Zalewska M.
Published: April 2019

This work is a subsequent step to study the feasibility of fast neutron fluency measurements using two different complementary methods.

Np-237 samples and planar silicon detectors were mounted very close to each other on different sections of a subcritical assembly irradiated with the proton beam of 0,66 GeV (the Quinta assembly at the Joint Institute for Nuclear Research, Dubna, Russia) to provide both samples with the same neutron fluency. We have processed the experimental data of irradiated Np-237 actinide samples and silicon detectors directly placed on two sections of the QUINTA setup without a lead shield-reflector.

Applying the try and error method we have found found that the neutron energy for which the ratio of the fission cross section to the capture cross section of the actinide Np-237 from the nuclear data base is equal to the measured ratio of the fissioned and captured actinide isotopes. The retrieved distinct fission and capture cross sections for the distinct neutron energy from the nuclear data base describe the average values.

The considered above experimental and earlier obtained data have been shown that the higher is the average neutron energy the smaller is the difference of the neutron fluency measurement between the two methods. This effect has been expected since the silicon detector method efficiently measures the fast neutrons of the energy higher than about 170 keV while the actinide method covers a wider energy range.
Am-241 incineration measurements with activation method in the QUINTA neutron field
Authors: Kilim S. , Strugalska-Gola E. , Szuta M. , Tyutyunnikov S. , Dalkhjav O. , Stegailov V.I. , Kryachko I.A. , Khushvaktov J.H. , Shakun A.G. , Sagimbaeva F.B. , Balandin A.S.
Published: April 2019

Am-241 sample was irradiated in spallation neutrons produced in ADS setup QUINTA at the JINR in Dubna. The energy was 660 MeV in the proton beam. The incineration study method was based on gamma-ray spectrometry. During the analysis of the spectra, several fission products were identified. Fission product activities yielded the number of fissions. Nevertheless, the lines are assumed to belong to the neutron capture product covered by parasitic Np-238 decay lines. The Np-238 lines as a result of neutron capture by Np-237 made impossible to determine the number of captures in Am-241.
Modeling the influence of heavy ion beams on neurogenesis and functioning of hippocampal neural networks
Authors: Kolesnikova Elena , Bugay Aleksandr
Published: April 2019

Radiation-induced impairment of hippocampal neurogenesis is one of serious factors associated with cognitive detriments after radiation therapy of brain cancers and realization of long-term manned space flights. The goal of this study is to develop a mathematical model describing radiation-induced changes in cellular populations participating in neurogenesis and how these alterations worsen the processing of information by hippocampus. Modeling results have demonstrated that heavy ions may cause non-reversible suppression of neurogenesis, which is followed by failure of pattern encoding and retrieval by hippocampal neural networks.
Determination of the TMD gluon density in a proton using recent LHC data
Authors: Abdulov Nizami , Lipatov Artem , Lykasov Gennady , Malyshev Maxim
Published: April 2019

Unintegrated (or transverse momentum dependent, TMD) parton distributions in a proton are important in high-energy physics. Using the latest LHC data on the hadron production in pp collisions, we determine the parameters of the initial TMD gluon density, derived in the framework of quark-gluon string model at the low scale μ0 ~ 1 − 2 GeV and refine its large-x behavior using data on the tt̅ production at $\sqrt s = 13\,{\rm{TeV}}$. Then, by using the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation, we extend the obtained TMD gluon density to the whole kinematic region. We tested the proposed TMD gluon density to the inclusive Higgs production in different decay modes, t-channel single top production at the LHC and to the proton structure functions $F_2^c(x,\,{Q^2})$ and $F_2^b(x,\,{Q^2})$ in a wide region of x and Q2. Good agreement with the latest LHC and HERA data is achieved.
Spectra of negative particles in Au+Au collisions from BES-I at RHIC and z-scaling
Authors: Tokarev Mikhail , Kechechyan Armen , Zborovsky Imrich
Published: April 2019

Negative particle yields in Au + Au collisions obtained by the STAR Collaboration from BES-I at RHIC are analyzed in the framework of the z-scaling approach. The spectra were measured over a wide range of collision energy $\sqrt {{s_{NN}}} = 7.7 - 200\,{\rm{GeV}}$ and transverse momentum of produced particles for different centralities at $\left| \eta \right| \lt 0.5$. The scaling behavior of the spectra as a function of the collision energy and centrality in z-presentation is verified. The constituent energy loss in dependence on the energy and centrality of collision and transverse momentum of inclusive particle is estimated. New indication on self-similarity of fractal structure of nuclei and fragmentation process is found. A discontinuity of the model parameters - fractal and fragmentation dimensions and specific heat - is considered from the point of view of a phase transition in nuclear matter.
Analysis of the experimental data measured by BM@N drift chambers
Authors: Fedorišin Ján
Published: April 2019

The current status of the analysis of the experimental data measured by the drift chambers in the BM@N experiment is presented. Apart from the previously published analysis based on the deuteron beam data, this study shows preliminary results for the carbon data at energy 4:5 GeV per nucleon. Some practical issues, such as evaluation and possible removal of the combinatorial background, as well as reliability of the employed track reconstruction algorithm are discussed as well.
Investigation of the electromagnetic calorimeter response function by cosmic muons
Authors: Sakulin Dmitriy , Afanasev Sergey
Published: April 2019

In this work, the passage of cosmic muons in calorimetric modules was simulated. The coefficients for converting signal amplitudes into absorbed energy of a passing particle were obtained. The data collected during the exposure of the electromagnetic calorimeter to cosmic muons were analyzed. The results of the analysis were used to process the experimental data obtained in the interaction of carbon, argon and krypton at 3.5 GeV/nucleon energy with different targets.
Pseudorapidity dependence of multiplicity and transverse momentum fluctuations at the SPS energies
Authors: Prokhorova Daria
Published: April 2019

A search for the critical behavior of strongly interacting matter was done by studying the event-by-event fluctuations of multiplicity and transverse momentum of charged hadrons produced in inelastic p+p collisions and central Be+Be and Ar+Sc collisions at the NA61/SHINE experiment. Results for energy dependence of the scaled variance of the multiplicity distribution and for two families of strongly intensive measures of multiplicity and transverse momentum fluctuations Δ[PT, N] and Σ[PT, N] were presented. The study was performed in rapidity-integrated way and for different pseudorapidity regions, which corresponds to changing the rapidity averaged baryo-chemical potential and the value of temperature at the freeze-out stage. The strongly intensive measure Σ[NF, NB], evaluated in rapidity separated windows, was used in the analysis of short- and long-range multiplicity correlations and is considered to be sensitive for the initial conditions of particle production such as string fragmentation and fusion.
Heavy baryon spectroscopy
Authors: Faustov Rudolf N. , Galkin Vladimir O.
Published: April 2019

Masses of heavy baryons are calculated in the relativistic quarkdiquark picture. Obtained results are in good agreement with available experimental data including recent measurements by the LHCb Collaboration. Possible quantum numbers of excited heavy baryon states are discussed.
Resolving the SELEX–LHCb double-charm baryon conflict: the impact of intrinsic heavy-quark hadroproduction and supersymmetric light-front holographic QCD
Authors: Koshkarev Sergey , Groote Stefan
Published: April 2019

In this paper we review the hadroproduction mechanisms of doublecharm baryons for the different experimental environments and reinterpret the SELEX and LHCb results.
Observation of resonance-like behavior of the pp → {pp}sπ0 reaction around √s = 2.65 GeV
Authors: Kurbatov Vladimir , Tsirkov Dmitry , Komarov Vladimir , Baimurzinova Bota , Kunsafina Ainur , Kurmanaliev Zhanibek
Published: April 2019

The pp → {pp}sπ0 reaction, where {pp}s denotes a diproton, i.e. an unbound interacting proton pair in the 1S0 state, has been studied in order to obtain the forward differential cross section dσ/dΩ at 11 energy values in the region of 0.8–2.8 GeV. A resonance-like peak with the energy E0 = 2.647 ± 0.005 GeV and the width Γ = 0.26 ± 0.03 GeV has been observed in the energy dependence of the differential cross section dσ/dΩ at zero angle. The slope of the angular dependence for the energies in the peak region
is different compared with the energies around it. Possible implications on this phenomenon are discussed.
Search for η-mesic nuclei in the SRC/BM@N experiment at the Nuclotron
Authors: Afanasiev S.V. , Dryablov D.K. , Michaličková K.
Published: April 2019

The SRC/BM@N experiment was carried out in the 55th run of the Nuclotron using a liquid hydrogen target and a carbon beam with a kinetic energy of about 3.1 GeV/n. We propose to analyze the experimental data to search for a quasi-bound state of η-meson and nucleons in the reaction 12C+p → η(A-1)+X → π+p+(A-2). To achieve this goal, it is necessary to identify the residual nucleus (A-2) and the proton-pion pair formed from η-nuclei decay.
Feasibility of measuring EDM in spin transparent colliders
Authors: Kondratenko Anatoliy , Kondratenko Mikhail , Filatov Yury , Kovalenko Alexander , Derbenev Yaroslav , Morozov Vasiliy
Published: April 2019

A new polarization control mode called a Spin Transparency (ST) mode is currently being actively developed for new rings. The ST mode is an intrinsic feature of figure-8 rings such as the JLEIC at Jefferson Lab. A racetrack collider can be converted to the ST mode by inserting two identical Siberian snakes into its opposite straights as at NICA, JINR. The ST mode allows one to develop a completely new approach to the measurement of the EDMs of both protons and deuterons. The idea of the method is to use the significant enhancement of the EDM signal by the interaction of the EDM with arc magnets, which has an interference effect. A unique feature of this technique is the conceptual capability of measuring the EDM signal in the whole energy range of a ring without introducing additional electric fields using only its magnetic fields. We describe an experimental setup and provide estimates of the limiting EDM values that can be measured at the JLEIC and NICA colliders.
Calculation of field of spectrometric magnet with 0.13 m gap
Authors: Yudin Ivan
Published: April 2019

The spectrometric magnet is widely used in experiments on highenergy physics and a number of other fields. In this report, we present the results of calculating the magnetic field for a variant of a magnet with an interpolar gap of 0.13 m. Our spectrometer magnet has external dimensions of 2.95 x 2.12 x 1.62 m and an aperture (occupied by the beam) of 0.30 x 0.13 m. The simulation was carried out using an integral method of magnetostatics. The results of the calculated field distribution of the analyzing magnet with interpolar 0.13 m gap are given. The calculation was performed for the volume 0.33 x 0.0645 x 1.5 m, the volume of overlapping dimensions. The calculation of the spatial distribution of the three components of the magnetic field of the magnet described in the work is performed to obtain the information about the magnitude and uniformity of the magnetic field for different modes of operation of the spectrometer. The obtained results are planned for using in the processing of physical data.
The very forward hadron calorimeter PSD for the future CBM@FAIR experiment
Authors: Mikhaylov V. , Kugler A. , Kushpil V. , Svoboda O. , Tlustý P. , Golubeva M. , Guber F. , Ivashkin A. , Morozov S. , Klochkov V. , Selyuzhenkov I. , Senger A.
Published: April 2019

The Projectile Spectator Detector (PSD) of the CBM experiment at the future FAIR facility is a compensating lead-scintillator calorimeter designed to measure the energy distribution of the forward going projectile nucleons and nuclei fragments (reaction spectators) produced close to the beam rapidity. The detector performance for the centrality and reaction plane determination is reviewed based on Monte-Carlo simulations of gold-gold collisions by means of four different heavy-ion event generators. The PSD energy resolution and the linearity of the response measured at CERN PS for the PSD supermodule consisting of 9 modules are presented. Predictions of the calorimeter radiation conditions at CBM and response measurement of one PSD module equipped with neutron irradiated MPPCs used for the light read out are discussed.