Huifen Nie

Nanchang Institute of Technology

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Rama Bansil

Boston University

Miloš Steinhart

Czech Academy of Sciences, Institute of Macromolecular Chemistry

Nikolay V. Dokholyan

Penn State Milton S. Hershey Medical Center

Karl Ludwig

Boston University

ČK

Čestmı́r Koňák

Middle East Technical University

Feng Ding

Shenzhen Third People’s Hospital

Martin Helmstedt

Leipzig University

Jyotsana Lal

Argonne National Laboratory

Joona Bang

Korea University

Kyle C. Wilcox

AbbVie (United States)

Cooperative Institutions

University of North Carolina at Chapel Hill

Chinese Academy of Sciences

Boston University

University of Science and Technology Beijing

Czech Academy of Sciences, Institute of Macromolecular Chemistry

Northwestern Polytechnical University

University of Chinese Academy of Sciences

Harvard University

Nanjing Normal University

Nanchang Hangkong University

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Hot Deformation Behaviors and Intrinsic Hot Workability Map of Ti-12Mo-4Zr-5Sn Alloy Based on Physical Model and Polar Reciprocity Model

Metals (2020)

Peng Wan Hang Zou Kelu Wang Zhengzhi Zhao Shiqiang Lu

The hot compression tests of Ti-12Mo-4Zr-5Sn alloy were tested on the thermo-mechanical simulator of Gleeble-3500 under isothermal and constant strain rate. We studied this alloy’s behavior during thermal deformation at the conditions of T = 670~820 °C, ε ˙ = 0.001~10 s−1, and deformation degree 70%. The rheological stress curves of the alloy were modified, the characteristics of the rheological stress curves were analyzed, and the activation energy map of hot deformation was established. A physical constitutive model of the alloy based on strain compensation was established, which has taken the relationship between Young’s modulus and self-diffusion coefficient and temperature into account. Moreover, the intrinsic hot workability ξ map of the alloy was established based on the polar reciprocity model. The results show that this alloy’s rheological stress will descend when the temperature of deformation rises and grow when the strain rate increases, and has negative sensitivity of temperature and positive sensitivity of strain rate. According to the error calculation, the physical constitutive model’s correlation coefficient is 0.9910 and the average relative error is 3.97%, which has good accuracy. Through the analysis of the microstructures of the instability zone and the stability zone, it was found that the instability mode of the instability zone was dominated by the local flow, and the deformation mechanism of the stability zone was dominated by the dynamic recrystallization. The optimum processing parameters of the alloy known from ξ map and metallographic structure are the following: T = 790~820 °C and ε ˙ = 0.001~0.01 s−1.

Dynamic Recrystallization

Isothermal process

Flow stress

10.3390/met10070956

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Citations (9)

Protein folding: Then and now

Archives of Biochemistry and Biophysics (2007)

Yiwen Chen Feng Ding Huifen Nie Adrian W.R. Serohijos Shantanu Sharma

Folding (DSP implementation)

10.1016/j.abb.2007.05.014

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Citations (96)

Structure and dynamics of solutions of a polystyrene–polybutadiene pentablock copolymer in a styrene‐selective solvent

Journal of Polymer Science Part B Polymer Physics (2002)

Rama Bansil Huifen Nie Čestmı́r Koňák Martin Helmstedt Jyotsana Lal

Abstract We have examined solutions of a polystyrene–polybutadiene pentablock copolymer in 1,4‐dioxane, a slightly selective solvent for polystyrene and a θ solvent for polybutadiene, with static light scattering (SLS), dynamic light scattering (DLS), and small‐angle neutron scattering (SANS). The SANS data have been analyzed with the Percus–Yevick model to represent the scattering from interacting cores, approximated as hard spheres, and with a Lorentzian function to represent the scattering from unassociated and associated polymer chains. The SANS data at 25 °C clearly reveal interacting domains, approximately 6 nm in radius, formed by the association of the insoluble polybutadiene block in the 20% sample. The 4% sample does not show such domains, whereas the 7% sample represents an intermediate situation, with both unassociated polymer and associated polymer. At higher temperatures, the domains dissolve. The DLS data for samples with concentrations of 2–22% show two diffusive modes: a fast mode corresponding to the cooperative dynamics of concentration fluctuations and a slow mode corresponding to the diffusion of clusters. The large length‐scale heterogeneities, indicated by the strong angular dependence of SLS, implies that the small microdomains of about 10–15 polybutadiene blocks are bridged by the polystyrene chains, forming large aggregates with randomly distributed crosslinks on length scales much larger than the domain size. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 2807–2816, 2002

Polystyrene

Hydrodynamic radius

Radius of gyration

10.1002/polb.10332

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Citations (5)

Phase behavior and kinetics of disorder-order and order-order transitions in multi-block copolymers in selective solvents

PhDT (2005)

Huifen Nie

Order and disorder

Source

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Citations (1)

Protein folding: Then and now

Carolina Digital Repository (University of North Carolina at Chapel Hill) (2008)

Yiwen Chen Feng Ding Huifen Nie Adrian W.R. Serohijos Shantanu Sharma

Folding (DSP implementation)

10.17615/0reh-5583

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Citations (3)

iFold: a platform for interactive folding simulations of proteins

Bioinformatics (2006)

Shantanu Sharma Feng Ding Huifen Nie Daniel Watson Aditya Unnithan

We built a novel web-based platform for performing discrete molecular dynamics simulations of proteins. In silico protein folding involves searching for minimal frustration in the vast conformational landscape. Conventional approaches for simulating protein folding insufficiently address the problem of simulations in relevant time and length scales necessary for a mechanistic understanding of underlying biomolecular phenomena. Discrete molecular dynamics (DMD) offers an opportunity to bridge the size and timescale gaps and uncover the structural and biological properties of experimentally undetectable protein dynamics. The iFold server supports large-scale simulations of protein folding, thermal denaturation, thermodynamic scan, simulated annealing and p(fold) analysis using DMD and coarse-grained protein model with structure-based Gō-interactions between amino acids.http://ifold.dokhlab.org

Folding (DSP implementation)

10.1093/bioinformatics/btl460

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Citations (26)

Kinetics of Hexagonal−Body-Centered Cubic Transition in a Triblock Copolymer in a Selective Solvent: Time-Resolved Small-Angle X-ray Scattering Measurements and Model Calculations

Macromolecules (2007)

Minghai Li Yongsheng Liu Huifen Nie Rama Bansil Miloš Steinhart

Time-resolved small-angle X-ray scattering (SAXS) was used to examine the kinetics of the transition from hexagonal (hex) cylinders to body-centered cubic (bcc) spheres at various temperatures in poly(styrene-b-ethylene-co-butylene-b-styrene) (SEBS) in mineral oil, a selective solvent for the middle ethylene-co-butylene (EB) block. Temperature-ramp SAXS and rheology measurements show the hex to bcc order−order transition (OOT) at ∼127 °C and order−disorder transition (ODT) at ∼180 °C. We also observed the metastability limit of hex in bcc with a spinodal temperature, Ts ∼ 150 °C. The OOT exhibits three stages and occurs via a nucleation and growth mechanism when the final temperature Tf < Ts. Spinodal decomposition in a continuous ordering system was seen when Ts < Tf < TODT. We observed that hex cylinders transform to disordered spheres via a transient bcc state. We develop a geometrical model of coupled anisotropic fluctuations and calculate the scattering which shows very good agreement with the SAXS data. The splitting of the primary peak into two peaks when the cylinder spacing and modulation wavelength are incommensurate predicted by the model is confirmed by analysis of the SAXS data.

Small-angle X-ray scattering

Spinodal decomposition

Spinodal

Metastability

10.1021/ma0716276

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Citations (26)

The Problems of the Integration of Chinese and American Education and Moral Education in College Art Education are Explored

Advances in Social Science, Education and Humanities Research/Advances in social science, education and humanities research (2021)

Huifen Nie

In college education, the all-round development of moral, intellectual and physical beauty is the most basic educational concept in our country, and it is also the goal of many school education.The integration of aesthetic education and moral education is in line with General Secretary Xi Jinping's speech at the National Education Congress: "To train socialist builders and successors who are all-round development of moral, intellectual and physical work, to accelerate the modernization of education, to build a strong educational power, and to do a good job of education to the satisfaction of the people."Aesthetic education can enrich the connotation of moral education, make moral education interesting, and college fine arts will improve the educational space because of the integration of moral education and aesthetic education.In the reality of art education in colleges and universities, there are some problems in the integration of aesthetic education and moral education, among which the lack of policy support, ideological awareness is not in place, difficult implementation process and other factors make the aesthetic education and moral education between the two can not penetrate each other very well.Starting from the concept of aesthetic education and moral education, this paper emphasizes the value of the integration of aesthetic education and moral education, analyzes the problems existing in art education in colleges and universities in China, and puts forward corresponding measures to solve them, hoping that art education in colleges and universities can play its role better.

Moral Education

10.2991/assehr.k.211220.065

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Citations (0)

Structure and dynamics of a pentablock copolymer of polystyrene-polybutadiene in a butadiene-selective solvent

Polymer (2004)

Huifen Nie Minghai Li Rama Bansil Čestmı́r Koňák Martin Helmstedt

Polystyrene

10.1016/j.polymer.2004.10.051

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Citations (11)

Association Behavior of Heptablock Copolymers in Selective Solvents