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Article ; Online: Integrator for general spin-s Gross-Pitaevskii systems.

Jain, Mudit / Amin, Mustafa A / Pu, Han

2023 Volume 108, Issue 5-2, Page(s) 55305

Abstract: We provide an algorithm, i-SPin 2, for evolving general spin-s Gross-Pitaevskii or nonlinear Schrödinger systems carrying a variety of interactions, where the 2s+1 components of the "spinor" field represent the different spin-multiplicity states. We ... ...

Abstract	We provide an algorithm, i-SPin 2, for evolving general spin-s Gross-Pitaevskii or nonlinear Schrödinger systems carrying a variety of interactions, where the 2s+1 components of the "spinor" field represent the different spin-multiplicity states. We consider many nonrelativistic interactions up to quartic order in the Schrödinger field (both short and long range, and spin-dependent and spin-independent interactions), including explicit spin-orbit couplings. The algorithm allows for spatially varying external and/or self-generated vector potentials that couple to the spin density of the field. Our work can be used for scenarios ranging from laboratory systems such as spinor Bose-Einstein condensates (BECs), to cosmological or astrophysical systems such as self-interacting bosonic dark matter. As examples, we provide results for two different setups of spin-1 BECs that employ a varying magnetic field and spin-orbit coupling, respectively, and also collisions of spin-1 solitons in dark matter. Our symplectic algorithm is second-order accurate in time, and is extensible to the known higher-order-accurate methods.
Language	English
Publishing date	2023-12-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	2844562-4
ISSN	2470-0053 ; 2470-0045
ISSN (online)	2470-0053
ISSN	2470-0045
DOI	10.1103/PhysRevE.108.055305
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: A tricritical Dicke model in and out of equilibrium

Padilla, Diego Fallas / Pu, Han

2023

Abstract: Light-matter interacting systems involving multi-level atoms are appealing platforms for testing equilibrium and dynamical phenomena. Here, we explore a tricritical Dicke model, where an ensemble of three-level systems interacts with a single light mode, ...

Abstract	Light-matter interacting systems involving multi-level atoms are appealing platforms for testing equilibrium and dynamical phenomena. Here, we explore a tricritical Dicke model, where an ensemble of three-level systems interacts with a single light mode, through two different approaches: a generalized Holstein-Primakoff map, and a treatment using the Gell-Mann matrices. Both methods are found to be equivalent in the thermodynamic limit of an infinite number of atoms. In equilibrium, the system exhibits a rich phase diagram where both continuous and discrete symmetries can be spontaneously broken. We characterize all the different types of symmetries according to their scaling behaviors. Far from the thermodynamic limit, considering just a few tens of atoms, the system already exhibits features that could help characterize both second and first-order transitions in a potential experiment. Importantly, we show that the tricritical behavior is preserved when dissipation is taken into account, moreover, the system develops a steady-state phase diagram with various regions of bistability, all of them converging at the tricritical point. Having multiple stable normal and superradiant phases opens prospective avenues for engineering interesting steady states by a clever choice of initial states and/or parameter quenching. Comment: 13 pages, 8 figures
Keywords	Quantum Physics
Subject code	612
Publishing date	2023-05-11
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Enhancing the Piezoelectric Properties of 3D Printed PVDF Using Concurrent Torsional Shear Strain

Pu Han / Alireza Tofangchi / Derek Carr / Sihan Zhang / Keng Hsu

Polymers, Vol 15, Iss 21, p

2023 Volume 4204

Abstract: Extrusion-based polymer 3D printing induces shear strains within the material, influencing its rheological and mechanical properties. In materials like polyvinylidene difluoride (PVDF), these strains stretch polymer chains, leading to increased ... ...

Abstract	Extrusion-based polymer 3D printing induces shear strains within the material, influencing its rheological and mechanical properties. In materials like polyvinylidene difluoride (PVDF), these strains stretch polymer chains, leading to increased crystallinity and improved piezoelectric properties. This study demonstrates a 400% enhancement in the piezoelectric property of extrusion-printed PVDF by introducing additional shear strains during the printing process. The continuous torsional shear strains, imposed via a rotating extrusion nozzle, results in additional crystalline β-phases, directly impacting the piezoelectric behavior of the printed parts. The effect of the nozzle’s rotational speed on the amount of β-phase formation is characterized using FTIR. This research introduces a new direction in the development of polymer and composite 3D printing, where in-process shear strains are used to control the alignment of polymer chains and/or in-fill phases and the overall properties of printed parts.
Keywords	PVDF ; torsional shear strain ; piezoelectric properties ; 3D printing ; Organic chemistry ; QD241-441
Subject code	660
Language	English
Publishing date	2023-10-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Reviewing the history of epilepsy for defeating this chronic and stubborn disease

Pu HAN

Chinese Journal of Contemporary Neurology and Neurosurgery, Vol 14, Iss 11, Pp 927-

2014 Volume 931

Abstract: Human beings have been recognizing and treating epilepsy for more than 3000 years. The cause of this disease was understood as demons in ancient times. A theory of brain disease was firstly proposed by Hippocrates. Although there were many years of case ... ...

Abstract	Human beings have been recognizing and treating epilepsy for more than 3000 years. The cause of this disease was understood as demons in ancient times. A theory of brain disease was firstly proposed by Hippocrates. Although there were many years of case observation and development of anatomy, epilepsy had not been better recognized. Before 1000 years, the word "epilepsy" was firstly called by Avicenna. Afterward scholars of many countries had made elementary progress in classification, signs and symptoms, pathology and treatment of epilepsy. The first monograph of epilepsy was published in 1881 by Gower. Then drug treatment and surgical treatment had been applied and developed. In recent 100 years, due to the establishment of International League Against Epilepsy (ILAE), publishing of Epilepsia and clinical employment of EEG, rapid progress has been made in basic and clinical study of epilepsy under the help of many other relative scientific knowledge. As early as over 3000 years before, there was already treatment of traditional Chinese medicine for epilepsy recorded in China. During the past 30 years, obvious advancement of learning and growing number of specialized personnel have been pushing epilepsy research forward in China. doi:10.3969/j.issn.1672-6731.2014.11.003
Keywords	Epilepsy ; History of medicine ; Review ; Neurology. Diseases of the nervous system ; RC346-429
Subject code	616
Language	English
Publishing date	2014-11-01T00:00:00Z
Publisher	Tianjin Huanhu Hospital
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Emergent Universality in a Quantum Tricritical Dicke Model.

Xu, Youjiang / Pu, Han

Physical review letters

2019 Volume 122, Issue 19, Page(s) 193201

Abstract: We propose a generalized Dicke model that supports a quantum tricritical point. We map out the phase diagram and investigate the critical behavior of the model through an exact low-energy effective Hamiltonian in the thermodynamic limit. As predicted by ... ...

Abstract	We propose a generalized Dicke model that supports a quantum tricritical point. We map out the phase diagram and investigate the critical behavior of the model through an exact low-energy effective Hamiltonian in the thermodynamic limit. As predicted by the Landau theory of phase transition, the order parameter shows nonuniversality at the tricritical point. Nevertheless, as a result of the separation of the classical and the quantum degrees of freedom, we find a universal relation between the excitation gap and the entanglement entropy for the entire critical line including the tricritical point. Here the universality is carried by the emergent quantum modes, whereas the order parameter is determined classically.
Language	English
Publishing date	2019-05-31
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.122.193201
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Article ; Online: Microbial communities of

Qin, Xiaolu / Pu, Han / Fang, Xilin / Shang, Qianqian / Li, Jianhua / Zhao, Qiaozhu / Wang, Xiaorui / Gu, Wei

PeerJ

2024 Volume 12, Page(s) e17240

Abstract: Background: Schisandra sphenanthera: Methods: In this study, 16S/ITS amplicon sequencing analysis was applied to unravel microbial communities in rhizospheric soil and different parts of wild : Results: The major components identified in the ... ...

Abstract	Background: Schisandra sphenanthera Methods: In this study, 16S/ITS amplicon sequencing analysis was applied to unravel microbial communities in rhizospheric soil and different parts of wild Results: The major components identified in the essential oils were sesquiterpene and oxygenated sesquiterpenes. The contents of essential oil components in fruit were much higher than that in stem and leaf, and the dominant essential oil components were different in these parts. The dominant components of the three parts were
MeSH term(s)	Schisandra/metabolism ; Schisandra/chemistry ; Soil Microbiology ; Microbiota/genetics ; Oils, Volatile/metabolism ; Secondary Metabolism ; Plant Stems/microbiology ; Plant Stems/metabolism ; Sesquiterpenes/metabolism ; Bacteria/genetics ; Bacteria/classification ; Bacteria/metabolism
Chemical Substances	Oils, Volatile ; Sesquiterpenes
Language	English
Publishing date	2024-04-26
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2703241-3
ISSN	2167-8359 ; 2167-8359
ISSN (online)	2167-8359
ISSN	2167-8359
DOI	10.7717/peerj.17240
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Understanding the Quantum Rabi Ring Using Analogies to Quantum Magnetism.

Fallas Padilla, Diego / Pu, Han / Cheng, Guo-Jing / Zhang, Yu-Yu

Physical review letters

2022 Volume 129, Issue 18, Page(s) 183602

Abstract: We map a quantum Rabi ring, consisting of N cavities arranged in a ring geometry, into an effective magnetic model containing the XY exchange and the Dzyaloshinskii-Moriya (DM) interactions. The analog of the latter is induced by an artificial magnetic ... ...

Abstract	We map a quantum Rabi ring, consisting of N cavities arranged in a ring geometry, into an effective magnetic model containing the XY exchange and the Dzyaloshinskii-Moriya (DM) interactions. The analog of the latter is induced by an artificial magnetic field, which modulates photon hopping between nearest-neighbor cavities with a phase. This mapping facilitates the description and understanding of the different phases in the quantum optical model through simple arguments of competing magnetic interactions. For the square geometry (N=4) the rich phase diagram exhibits three superradiant phases denoted as ferro-superradiant, antiferro-superradiant, and chiral superradiant. In particular, the DM interaction is responsible for the chiral phase in which the energetically degenerate configurations of the order parameters are similar to the in-plane magnetizations of skyrmions with different helicities. The antiferro-superradiant phase is suppressed in the triangle geometry (N=3) as geometric frustration contributes to stabilize the chiral phase even for small values of the DM interaction. The chiral phases for odd and even N show a different scaling behavior close to the phase transition. The equivalent behavior on both systems opens the possibility of simulating chiral magnetism in a few-body quantum optical platform, as well as understanding one system using the insights gained from the other.
Language	English
Publishing date	2022-11-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.129.183602
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Article ; Online: Decision Tree-Based Data Stratification Method for the Minimization of the Masking Effect in Adverse Drug Reaction Signal Detection

Jianxiang Wei / Lu Cheng / Pu Han / Yunxia Zhu / Weidong Huang

Applied Sciences, Vol 11, Iss 11380, p

2021 Volume 11380

Abstract: Data masking is an inborn defect of measures of disproportionality in adverse drug reactions signal detection. Some improved methods which used gender and age for data stratification only considered the patient-related confounding factors, ignoring the ... ...

Abstract	Data masking is an inborn defect of measures of disproportionality in adverse drug reactions signal detection. Some improved methods which used gender and age for data stratification only considered the patient-related confounding factors, ignoring the drug-related influencing factors. Due to a large number of reports and the high proportion of antibiotics in the Chinese spontaneous reporting database, this paper proposes a decision tree-stratification method for the minimization of the masking effect by integrating the relevant factors of patients and drugs. The adverse drug reaction monitoring reports of Jiangsu Province in China from 2011 to 2018 were selected for this study. First, the age division interval was determined based on the statistical analysis of antibiotic-related data. Secondly, correlation analysis was conducted based on the patient’s gender and age respectively with the drug category attributes. Thirdly, the decision tree based on age and gender was constructed by the J48 algorithm, which was used to determine if drugs belonged to antibiotics as a classification label. Fourthly, some performance evaluation indicators were constructed based on the data of drug package inserts as a standard signal library: recall, precision, and F (the arithmetic harmonic mean of recall and precision). Finally, four experiments were carried out by means of the proportional reporting ratio method: non-stratification (total data), gender-stratification, age-stratification and decision tree-stratification, and the performance of the signal detection results was compared. The experimental results showed that the decision tree-stratification was superior to the other three methods. Therefore, the data-masking effect can be further minimized by comprehensively considering the patient and drug-related confounding factors.
Keywords	decision tree ; data masking effect ; adverse drug reaction ; signal detection ; data stratification ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	006
Language	English
Publishing date	2021-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Investigation of particle flow characteristics in a CFB recirculation system using electrical capacitance volume tomography

Bian, Qitao / Yang, Daoye / Wu, Zhangyou / Liu, Baocun / Zhang, Junnan / Deng, Ruyun / Pu, Han

Powder technology. 2022 July 21,

2022

Abstract: Gas-solid fluidized beds have complex flow characteristics and opacity, and the particle motion characteristics in the recirculation system of circulating fluidized bed (CFB) have not been studied thoroughly. In order to study the motion of gas-solid two- ...

Abstract	Gas-solid fluidized beds have complex flow characteristics and opacity, and the particle motion characteristics in the recirculation system of circulating fluidized bed (CFB) have not been studied thoroughly. In order to study the motion of gas-solid two-phase flow in a CFB recirculation system, a 32-electrode electrical capacitance volume tomography (ECVT) system was developed with an imaging speed of 120 frames per second. Under various working conditions, the experimental platform of CFB was also built to measure the particle flow in the CFB recirculation system with the 32-electrode ECVT system, including the solid concentration and the flow velocity of particles in the branch pipe. When the velocity of fluidized gas Uf is adjusted from 2.73 m/s to 1.76 m/s, the average solid concentration in the riser is roughly distribution of upper dilute and lower concentrated along the axial direction. With the decrease of Uf, the average solid concentration generally showed an increasing trend, and the difference of solid concentration between different planes in the branch pipe gradually decreased. The slug length in the imaging area decreases, and the rising velocity of the slug in the riser above the branch pipe decreases.
Keywords	capacitance ; fluidized beds ; opacity ; slugs ; technology ; tomography
Language	English
Dates of publication	2022-0721
Publishing place	Elsevier B.V.
Document type	Article
Note	Pre-press version
ISSN	0032-5910
DOI	10.1016/j.powtec.2022.117765
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Video tampering detection algorithm based on spatial constraint and gradient structure information

PU Han, HUANG Tianqiang, WENG Bin, XIAO Hui, HUANG Wei

网络与信息安全学报, Vol 5, Iss 5, Pp 64-

2019 Volume 79

Abstract: The traditional video passive forensics method using only the principle of similarity between adjacent frames will cause a lot of false detection for the video with severe motion.Aiming at this problem, a video tamper detection method combining spatial ... ...

Abstract	The traditional video passive forensics method using only the principle of similarity between adjacent frames will cause a lot of false detection for the video with severe motion.Aiming at this problem, a video tamper detection method combining spatial constraints and gradient structure information was proposed. Firstly, the low motion region and the high texture region were extracted by using spatial constraint criteria. The two regions were merged to obtain the robust quantitative correlation rich regions for extracting video optimal similarity features. Then improving the extraction and description methods of the original features, and using the similarity of the gradient structure in accordance with the characteristics of the human visual system to calculate the spatial constraint correlation value. Finally, the tampering points were located by the Chebyshev inequality. Experiments show that the proposed algorithm has lower false detection rate and higher accuracy.
Keywords	spatial constraints ; the quantitative correlation rich regions ; gssim（gradient structure similarity） ; videos with severe motion ; Electronic computers. Computer science ; QA75.5-76.95
Subject code	004
Language	English
Publishing date	2019-10-01T00:00:00Z
Publisher	POSTS&TELECOM PRESS Co., LTD
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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