Search results for: Qinglin Tang

Items from 1 to 20 out of 23 results

article

A mass‐ and energy‐preserving numerical scheme for solving coupled Gross–Pitaevskii equations in high dimensions

Jianfeng Liu, Qinglin Tang, Tingchun Wang

Numerical Methods for Partial Differential Equations > 39 > 6 > 4248 - 4269

This article is concerned with numerical study of a coupled system of Gross–Pitaevskii equations which describes the spin‐orbit‐coupled Bose–Einstein condensates. Due to the fact that this system possesses the total mass and energy conservation property and often appears in high dimensions, it brings a significant burden in designing and analyzing a suitable numerical scheme for solving the coupled...

article

Visible‐Light‐Driven Redox Neutral Direct C−H Amination of Glycine Derivatives and Peptides with N‐Acyloxyphthalimides

Xiaoyun Zhao, Bai Li, Jingyao Xu, Qinglin Tang, more

Chemistry – A European Journal > 27 > 49 > 12540 - 12544

A room temperature, visible‐light‐promoted and redox neutral direct C−H amination of glycine and peptides has been firstly accomplished by using N‐acyloxyphthalimide or ‐succinimide as nitrogen‐radical precursor. The present strategy provides ways to introduce functionalities such as N‐acyloxyphthalimide or ‐succinimide specifically to terminal glycine segment of peptides. Herein, mild conditions...

article

Regularized numerical methods for the logarithmic Schrödinger equation

Weizhu Bao, Rémi Carles, Chunmei Su, Qinglin Tang

Numerische Mathematik > 2019 > 143 > 2 > 461-487

We present and analyze two numerical methods for the logarithmic Schrödinger equation (LogSE) consisting of a regularized splitting method and a regularized conservative Crank–Nicolson finite difference method (CNFD). In order to avoid numerical blow-up and/or to suppress round-off error due to the logarithmic nonlinearity in the LogSE, a regularized logarithmic Schrödinger equation (RLogSE) with...

article

Genome‐wide identification of loci affecting seed glucosinolate contents in Brassica napus L.

Dayong Wei, Yixin Cui, Jiaqin Mei, Lunwen Qian, more

Journal of Integrative Plant Biology > 61 > 5 > 611 - 623

Glucosinolates are amino acid‐derived secondary metabolites that act as chemical defense agents against pests. However, the presence of high levels of glucosinolates severely diminishes the nutritional value of seed meals made from rapeseed (Brassica napus L.). To identify the loci affecting seed glucosinolate content (SGC), we conducted genome‐wide resequencing in a population of 307 diverse B. napus...

article

Protein interactions of SOC1 with SVP are regulated by a few crucial amino acids in flowering pathways of Brassica juncea

Chaochuang Li, Huiying Gu, Wei Jiang, Chenhui Zou, more

Acta Physiologiae Plantarum > 2019 > 41 > 4 > 1-7

SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) is a vital flowering signal integrator to promote flowering, which is inhibited by a MADS-box transcription factor, SHORT VEGETATIVE PHASE (SVP). However, it remains elusive about how SOC1 interacts with SVP in flowering pathways of Brassica juncea. Here, B. juncea SOC1 (BjuSOC1) gene was cloned and it expressed differently between stem apexes and...

article

A robust and efficient numerical method to compute the dynamics of the rotating two-component dipolar Bose–Einstein condensates

Qinglin Tang, Yong Zhang, Norbert J. Mauser

Computer Physics Communications > 2017 > 219 > C > 223-235

We present a robust and efficient numerical method to compute the dynamics of the rotating two-component dipolar Bose–Einstein condensates (BEC). Using the rotating Lagrangian coordinates transform (Bao et al., 2013), we reformulate the original coupled Gross–Pitaevskii equations (CGPE) into new equations where the rotating term vanishes and the potential becomes time-dependent. A time-splitting Fourier...

article

Efficient spectral computation of the stationary states of rotating Bose–Einstein condensates by preconditioned nonlinear conjugate gradient methods

Xavier Antoine, Antoine Levitt, Qinglin Tang

Journal of Computational Physics > 2017 > 343 > C > 92-109

We propose a preconditioned nonlinear conjugate gradient method coupled with a spectral spatial discretization scheme for computing the ground states (GS) of rotating Bose–Einstein condensates (BEC), modeled by the Gross–Pitaevskii Equation (GPE). We first start by reviewing the classical gradient flow (also known as imaginary time (IMT)) method which considers the problem from the PDE standpoint,...

article

Numerical Methods and Comparison for the Dirac Equation in the Nonrelativistic Limit Regime

Weizhu Bao, Yongyong Cai, Xiaowei Jia, Qinglin Tang

Journal of Scientific Computing > 2017 > 71 > 3 > 1094-1134

We analyze rigorously error estimates and compare numerically spatial/temporal resolution of various numerical methods for the discretization of the Dirac equation in the nonrelativistic limit regime, involving a small dimensionless parameter $$0<\varepsilon \ll 1$$ 0 < ε ≪ 1 which is inversely proportional to the speed of light. In this limit regime, the solution is highly oscillatory...

article

On the ground states and dynamics of space fractional nonlinear Schrödinger/Gross–Pitaevskii equations with rotation term and nonlocal nonlinear interactions

Xavier Antoine, Qinglin Tang, Yong Zhang

Journal of Computational Physics > 2016 > 325 > C > 74-97

In this paper, we propose some efficient and robust numerical methods to compute the ground states and dynamics of Fractional Schrödinger Equation (FSE) with a rotation term and nonlocal nonlinear interactions. In particular, a newly developed Gaussian-sum (GauSum) solver is used for the nonlocal interaction evaluation [31]. To compute the ground states, we integrate the preconditioned Krylov subspace...

article

Computing the ground state and dynamics of the nonlinear Schrödinger equation with nonlocal interactions via the nonuniform FFT

Weizhu Bao, Shidong Jiang, Qinglin Tang, Yong Zhang

Journal of Computational Physics > 2015 > 296 > Complete > 72-89

We present efficient and accurate numerical methods for computing the ground state and dynamics of the nonlinear Schrödinger equation (NLSE) with nonlocal interactions based on a fast and accurate evaluation of the long-range interactions via the nonuniform fast Fourier transform (NUFFT). We begin with a review of the fast and accurate NUFFT based method in [29] for nonlocal interactions where the...

article

A variational-difference numerical method for designing progressive-addition lenses

Wei Jiang, Weizhu Bao, Qinglin Tang, Hanquan Wang

Computer-Aided Design > 2014 > 48 > Complete > 17-27

We propose a variational-difference method for designing the optical free form surface of progressive-addition lenses (PALs). The PAL, which has a front surface with three important zones including the far-view, near-view and intermediate zones, is often used to remedy presbyopia by distributing optical powers of the three zones progressively and smoothly. The problem for designing PALs could be viewed...

article

An efficient spectral method for computing dynamics of rotating two-component Bose–Einstein condensates via coordinate transformation

Ju Ming, Qinglin Tang, Yanzhi Zhang

Journal of Computational Physics > 2014 > 258 > Complete > 538-554

In this paper, we propose an efficient and accurate numerical method for computing the dynamics of rotating two-component Bose–Einstein condensates (BECs) which is described by the coupled Gross–Pitaevskii equations (CGPEs) with an angular momentum rotation term and an external driving field. By introducing rotating Lagrangian coordinates, we eliminate the angular momentum rotation term from the CGPEs,...

article

Site‐Specific Gene Targeting Using Transcription Activator‐Like Effector (TALE)‐Based Nuclease in Brassica oleracea

Zijian Sun, Nianzu Li, Guodong Huang, Junqiang Xu, more

Journal of Integrative Plant Biology > 55 > 11 > 1092 - 1103

Site‐specific recognition modules with DNA nuclease have tremendous potential as molecular tools for genome targeting. The type III transcription activator‐like effectors (TALEs) contain a DNA binding domain consisting of tandem repeats that can be engineered to bind user‐defined specific DNA sequences. We demonstrated that customized TALE‐based nucleases (TALENs), constructed using a method called...

article

Numerical study of quantized vortex interaction in complex Ginzburg–Landau equation on bounded domains

Wei Jiang, Qinglin Tang

Applied Mathematics and Computation > 2013 > 222 > Complete > 210-230

In this paper, we study numerically quantized vortex dynamics and their interaction in the two-dimensional complex Ginzburg–Landau equation (CGLE) with a dimensionless parameter ε>0 on bounded domains under either Dirichlet or homogeneous Neumann boundary condition. We begin with a review of the reduced dynamical laws (RDLs) for time evolution of quantized vortex centers in CGLE and show how to...

article

Numerical methods and comparison for computing dark and bright solitons in the nonlinear Schrödinger equation

Weizhu Bao, Qinglin Tang, Zhiguo Xu

Journal of Computational Physics > 2013 > 235 > Complete > 423-445

In this paper, we propose new efficient and accurate numerical methods for computing dark solitons and review some existing numerical methods for bright and/or dark solitons in the nonlinear Schrödinger equation (NLSE), and compare them numerically in terms of accuracy and efficiency. We begin with a review of dark and bright solitons of NLSE with defocusing and focusing cubic nonlinearities, respectively...

article

A general static-headspace gas chromatographic method for determination of residual benzene in oral liquid pharmaceutical products

Hui Liu, Qinglin Tang, Robert J. Markovich, Abu M. Rustum

Journal of Pharmaceutical and Biomedical Analysis > 2011 > 54 > 2 > 417-421

Sodium benzoate is used in oral liquid pharmaceutical products for its anti-microbial properties. The benzoate salts present in liquid pharmaceutical products can potentially generate residual levels of free benzene during manufacturing of the drug product and or during the shelf-life of the product under its storage conditions. To ensure the safety and quality of the pharmaceutical products (containing...

article

Comparison study of porous, fused-core, and monolithic silica-based C18 HPLC columns for Celestoderm-V Ointment® analysis

Jinjian Zheng, Dolly Patel, Qinglin Tang, Robert J. Markovich, more

Journal of Pharmaceutical and Biomedical Analysis > 2009 > 50 > 5 > 815-822

In this paper, three C ₁₈ columns with different substrates (i.e., porous ACE-3 C ₁₈ , 3μm, fused-core Halo C ₁₈ , 2.7μm, and monolithic Chromolith C ₁₈ ) were compared for the analysis of a pharmaceutical product, Celestoderm-V Ointment ^® , that contains one active pharmaceutical ingredient, betamethasone-17-valerate and one critical pair of low level impurities,...

article

Development and validation of a stability-indicating HPLC method for simultaneous determination of salicylic acid, betamethasone dipropionate and their related compounds in Diprosalic Lotion®

Minshan Shou, Wilmer A. Galinada, Yu-Chien Wei, Qinglin Tang, more

Journal of Pharmaceutical and Biomedical Analysis > 2009 > 50 > 3 > 356-361

Diprosalic Lotion ^® is an anti-inflammatory drug product that contains salicylic acid and betamethasone dipropionate as active pharmaceutical ingredients (APIs). A reversed-phase high performance liquid chromatography (RP-HPLC) method was developed for simultaneous determination of salicylic acid, betamethasone dipropionate, and their related compounds in Diprosalic Lotion ^® . A 150mm×4...

article

Development of a high performance size exclusion chromatography method to determine the stability of Human Serum Albumin in a lyophilized formulation of Interferon alfa-2b

Jin Qian, Qinglin Tang, Bart Cronin, Robert Markovich, more

Journal of Chromatography A > 2008 > 1194 > 1 > 48-56

Intron Powder for Injection is a lyophilized formulation of Interferon alfa-2b marketed for treatment of Hepatitis C and some cancer indications. Human Serum Albumin (HSA) is used as a lyoprotectant and cryoprotectant at 1.0mg/mL in the product formulation. No stability-indicating method, which can quantitate HSA and its dimer or oligomer aggregates in the formulated product, has been published to...

article

Small Diameter (3 μm), Large Pore (1500 Å) Octadecylsilica for Capillary Electrochromatography

Qinglin Tang, Naijun Wu, Bingfang Yue, M. L. Lee

Chromatographia > 2005 > 61 > 7-8 > 345-350

An ODS packing material was specially designed for CEC to achieve high efficiency. The size of the particles was approximately 3.2 μm based on scanning electron microscopy, and the average pore size of the particles was 1500 Å by mercury intrusion porosimetry measurement. The packing materials were used in sol-gel bonded continuous-bed columns. The performance of columns containing these 3 μm, 1500...

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INFONA - science communication portal

Search results for: Qinglin Tang

A mass‐ and energy‐preserving numerical scheme for solving coupled Gross–Pitaevskii equations in high dimensions

Visible‐Light‐Driven Redox Neutral Direct C−H Amination of Glycine Derivatives and Peptides with N‐Acyloxyphthalimides

Regularized numerical methods for the logarithmic Schrödinger equation

Genome‐wide identification of loci affecting seed glucosinolate contents in Brassica napus L.

Protein interactions of SOC1 with SVP are regulated by a few crucial amino acids in flowering pathways of Brassica juncea

A robust and efficient numerical method to compute the dynamics of the rotating two-component dipolar Bose–Einstein condensates

Efficient spectral computation of the stationary states of rotating Bose–Einstein condensates by preconditioned nonlinear conjugate gradient methods

Numerical Methods and Comparison for the Dirac Equation in the Nonrelativistic Limit Regime

On the ground states and dynamics of space fractional nonlinear Schrödinger/Gross–Pitaevskii equations with rotation term and nonlocal nonlinear interactions

Computing the ground state and dynamics of the nonlinear Schrödinger equation with nonlocal interactions via the nonuniform FFT

A variational-difference numerical method for designing progressive-addition lenses

An efficient spectral method for computing dynamics of rotating two-component Bose–Einstein condensates via coordinate transformation

Site‐Specific Gene Targeting Using Transcription Activator‐Like Effector (TALE)‐Based Nuclease in Brassica oleracea

Numerical study of quantized vortex interaction in complex Ginzburg–Landau equation on bounded domains

Numerical methods and comparison for computing dark and bright solitons in the nonlinear Schrödinger equation

A general static-headspace gas chromatographic method for determination of residual benzene in oral liquid pharmaceutical products

Comparison study of porous, fused-core, and monolithic silica-based C18 HPLC columns for Celestoderm-V Ointment® analysis

Development and validation of a stability-indicating HPLC method for simultaneous determination of salicylic acid, betamethasone dipropionate and their related compounds in Diprosalic Lotion®

Development of a high performance size exclusion chromatography method to determine the stability of Human Serum Albumin in a lyophilized formulation of Interferon alfa-2b

Small Diameter (3 μm), Large Pore (1500 Å) Octadecylsilica for Capillary Electrochromatography

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