Search results for: Haibin Chen

Items from 1 to 20 out of 115 results

article

Enzymatic (2R,4R)‐Pentanediol Synthesis – “Putting a Bottle on the Table”

Torsten Sehl, Lisa Seibt, Katrin Kappauf, Pia Ergezinger, more

Chemie Ingenieur Technik > 95 > 4 > 557 - 564

(2R,4R)‐Pentanediol is an interesting precursor for the synthesis of chiral ligands. A ketoreductase (KRED) was employed for the asymmetric reduction of acetylacetone to this diol. Biocatalysis often suffers from low concentrations of hydrophobic substrates and low stability of the enzyme in unconventional media. Here, we present an engineered KRED variant applicable in a neat substrate system, including...

article

Expanded Phase Distribution in Low Average Layer‐Number 2D Perovskite Films: Toward Efficient Semitransparent Solar Cells

Yi Yang, Cheng Liu, Hiroyuki Kanda, Yong Ding, more

Advanced Functional Materials > 31 > 40 > n/a - n/a

The application of low average layer‐number (〈n〉 ≤ 2) 2D perovskites in semitransparent photovoltaics (ST‐PVs) has been hindered by their strong exciton binding energy and high electrical anisotropy. Here, the phase distribution is expanded fully and orderly to enable efficient charge transport in 2D (NMA)₂(MA)Pb₂I₇ (NMA: 1‐naphthylmethylammonium, MA: CH₃NH₃⁺) perovskite films by regulating the sedimentation...

article

Fiber‐optic whispering‐gallery‐mode magnetic field sensor based on magnetic fluid infiltrated hollow core fiber

Junying Zhang, Chen Tian, Ruohui Wang, Haibin Chen, more

Microwave and Optical Technology Letters > 63 > 9 > 2442 - 2448

A fiber‐optic magnetic field sensor based on magnetic fluid (MF) infiltrated hollow core fiber (HCF) was proposed. The MF infiltrated HCF was used as a micro‐capillary ring resonator, in which, whispering‐gallery modes (WGMs) were exited through a closely placed tapered fiber. Through the intensity modulation introduced by external magnetic field on the resonance dip of the WGM excited in the MF infiltrated...

article

M-positive semi-definiteness and M-positive definiteness of fourth-order partially symmetric Cauchy tensors

Haitao Che, Haibin Chen, Yiju Wang

Journal of Inequalities and Applications > 2019 > 2019 > 1 > 1-18

Inspired by symmetric Cauchy tensors, we define fourth-order partially symmetric Cauchy tensors with their generating vectors. In this article, we focus on the necessary and sufficient conditions for the M-positive semi-definiteness and M-positive definiteness of fourth-order Cauchy tensors. Moreover, the necessary and sufficient conditions of the strong ellipticity conditions for fourth-order Cauchy...

article

Does environmental regulation affect CO₂ emissions? Analysis based on threshold effect model

Yanan Wang, Yihui Zuo, Wei Li, Yanqing Kang, more

Clean Technologies and Environmental Policy > 2019 > 21 > 3 > 565-577

With the increasing pressure on China to reduce carbon dioxide (CO₂) emissions, it is crucial to clarify the effect of implementing environmental regulations and their impact on the region. Many studies have focused on the linear, rather than nonlinear, relationship between environmental regulation and CO₂ emissions. The exploration of nonlinear relations is conducive to the in-depth study of policy...

article

Solution structures of tensor complementarity problem

Xueyong Wang, Haibin Chen, Yiju Wang

Frontiers of Mathematics in China > 2018 > 13 > 4 > 935-945

We introduce two new types of tensors called the strictly semimonotone tensor and the range column sufficient tensor and explore their structure properties. Based on the obtained results, we make a characterization to the solution of tensor complementarity problem.

article

Investigating rectal toxicity associated dosimetric features with deformable accumulated rectal surface dose maps for cervical cancer radiotherapy

Jiawei Chen, Haibin Chen, Zichun Zhong, Zhuoyu Wang, more

Radiation Oncology > 2018 > 13 > 1 > 1-10

Background Better knowledge of the dose-toxicity relationship is essential for safe dose escalation to improve local control in cervical cancer radiotherapy. The conventional dose-toxicity model is based on the dose volume histogram, which is the parameter lacking spatial dose information. To overcome this limit, we explore a comprehensive rectal dose-toxicity model based on both dose volume histogram...

article

Synthesis of Vibegron Enabled by a Ketoreductase Rationally Designed for High pH Dynamic Kinetic Reduction

Feng Xu, Birgit Kosjek, Fabien L. Cabirol, Haibin Chen, more

Angewandte Chemie International Edition > 57 > 23 > 6863 - 6867

Described here is an efficient stereoselective synthesis of vibegron enabled by an enzymatic dynamic kinetic reduction that proceeds in a high‐pH environment. To overcome enzyme performance limitations under these conditions, a ketoreductase was evolved by a computationally and structurally aided strategy to increase cofactor stability through tighter binding.

article

Synthesis of Vibegron Enabled by a Ketoreductase Rationally Designed for High pH Dynamic Kinetic Reduction

Feng Xu, Birgit Kosjek, Fabien L. Cabirol, Haibin Chen, more

Angewandte Chemie > 130 > 23 > 6979 - 6983

article

Influence of tube potential on quantitative coronary plaque analyses by low radiation dose computed tomography: a phantom study

Chunhong Wang, Yuliang Liao, Haibin Chen, Xin Zhen, more

The International Journal of Cardiovascular Imaging > 2018 > 34 > 8 > 1315-1322

Previous studies have shown that employing the low dose computed tomography (CT) technique based on low tube potential reduces the radiation dose required for the coronary artery examination protocol. However, low tube potential may adversely influence the CT number of plaque composition. Therefore, we aimed to determine whether quantitative atherosclerotic plaque analysis by a multi-slice, low radiation...

article

Column sufficient tensors and tensor complementarity problems

Haibin Chen, Liqun Qi, Yisheng Song

Frontiers of Mathematics in China > 2018 > 13 > 2 > 255-276

Stimulated by the study of sufficient matrices in linear complementarity problems, we study column sufficient tensors and tensor complementarity problems. Column sufficient tensors constitute a wide range of tensors that include positive semi-definite tensors as special cases. The inheritance property and invariant property of column sufficient tensors are presented. Then, various spectral properties...

article

The Impact of Ecological Construction Programs on Grassland Conservation in Inner Mongolia, China

Min Liu, Liesbeth Dries, Wim Heijman, Jikun Huang, more

Land Degradation & Development > 29 > 2 > 326 - 336

A series of Ecological Construction Programs have been initiated to protect the condition of grasslands in China during recent decades. However, grassland degradation is still severe, and conditions have not been restored as intended. This paper aims to empirically examine the effectiveness of these programs for protecting the grassland condition in the extensive pastoral areas of China. We focus...

article

A new simultaneous iterative method with a parameter for solving the extended split equality problem and the extended split equality fixed point problem

Haitao Che, Haibin Chen, Meixia Li

Numerical Algorithms > 2018 > 79 > 4 > 1231-1256

In this article, we first propose an extended split equality problem which is an extension of the convex feasibility problem, and then introduce a parameter w to establish the fixed point equation system. We show the equivalence of the extended split equality problem and the fixed point equation system. Based on the fixed point equation system, we present a simultaneous iterative algorithm and obtain...

article

An alternative extragradient projection method for quasi-equilibrium problems

Haibin Chen, Yiju Wang, Yi Xu

Journal of Inequalities and Applications > 2018 > 2018 > 1 > 1-15

For the quasi-equilibrium problem where the players’ costs and their strategies both depend on the rival’s decisions, an alternative extragradient projection method for solving it is designed. Different from the classical extragradient projection method whose generated sequence has the contraction property with respect to the solution set, the newly designed method possesses an expansion property...

article

A semidefinite program approach for computing the maximum eigenvalue of a class of structured tensors and its applications in hypergraphs and copositivity test

Haibin Chen, Yannan Chen, Guoyin Li, Liqun Qi

Numerical Linear Algebra with Applications > 25 > 1 > n/a - n/a

Finding the maximum eigenvalue of a symmetric tensor is an important topic in tensor computation and numerical multilinear algebra. In this paper, we introduce a new class of structured tensors called W‐tensors, which not only extends the well‐studied nonnegative tensors by allowing negative entries but also covers several important tensors arising naturally from spectral hypergraph theory. We then...

article

Transplantation routes affect the efficacy of human umbilical cord mesenchymal stem cells in a rat GDM model

Dan Wu, Shan Zou, Haibin Chen, Xiaoyan Li, more

Clinica Chimica Acta > 2017 > 475 > C > 137-146

Gestational diabetes mellitus (GDM) is harmful to both the mother and fetus. Although transplantation of human umbilical cord mesenchymal stem cells (HUMSCs) could be a useful therapy for GDM, the influences of different transplantation routes on the therapeutic effects remain unclear. In this study, we isolated and cultured the HUMSCs for transplantation, and the biological activity of HUMSCs was...

article

Inducible knockout of Syncytin-A gene leads to an extensive placental vasculature deficiency, implications for preeclampsia

Shan Qiao, Fengchao Wang, Haibin Chen, Shi-Wen Jiang

Clinica Chimica Acta > 2017 > 474 > C > 137-146

Syncytin-1, a human endogenous retroviral envelope gene (HERVW1), is specifically expressed in placental trophoblasts and mediates the formation of syncytiotrophoblasts through a fusogenic activity. Syncytin-1 expression deficiency has been repeatedly observed in preeclamptic/IUGR placentas. Previous gene knockout studies indicated that in mice, complete syncytin-A null mouse embryos died in utero...

article

Construction of a versatile expression library for all human single-pass transmembrane proteins for receptor pairings by high throughput screening

Wei Yang, Søren Berg Padkjær, Jishu Wang, Zhe Sun, more

Journal of Biotechnology > 2017 > 260 > C > 18-30

Interactions between protein ligands and receptors play crucial roles in cell-cell signalling. Most of the human cell surface receptors have been identified in the post-Human Genome Project era but many of their corresponding ligands remain unknown. To facilitate the pairing of orphan receptors, 2762 sequences encoding all human single-pass transmembrane proteins were selected for inclusion into a...

article

On computing minimal H-eigenvalue of sign-structured tensors

Haibin Chen, Yiju Wang

Frontiers of Mathematics in China > 2017 > 12 > 6 > 1289-1302

Finding the minimal H-eigenvalue of tensors is an important topic in tensor computation and numerical multilinear algebra. This paper is devoted to a sum-of-squares (SOS) algorithm for computing the minimal H-eigenvalues of tensors with some sign structures called extended essentially nonnegative tensors (EEN-tensors), which includes nonnegative tensors as a subclass. In the even-order symmetric case,...

article

Copositive tensor detection and its applications in physics and hypergraphs

Haibin Chen, Zheng-Hai Huang, Liqun Qi

Computational Optimization and Applications > 2018 > 69 > 1 > 133-158

Copositivity of tensors plays an important role in vacuum stability of a general scalar potential, polynomial optimization, tensor complementarity problem and tensor generalized eigenvalue complementarity problem. In this paper, we propose a new algorithm for testing copositivity of high order tensors, and then present applications of the algorithm in physics and hypergraphs. For this purpose, we...

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INFONA - science communication portal

Search results for: Haibin Chen

Enzymatic (2R,4R)‐Pentanediol Synthesis – “Putting a Bottle on the Table”

Expanded Phase Distribution in Low Average Layer‐Number 2D Perovskite Films: Toward Efficient Semitransparent Solar Cells

Fiber‐optic whispering‐gallery‐mode magnetic field sensor based on magnetic fluid infiltrated hollow core fiber

M-positive semi-definiteness and M-positive definiteness of fourth-order partially symmetric Cauchy tensors

Does environmental regulation affect CO₂ emissions? Analysis based on threshold effect model

Solution structures of tensor complementarity problem

Investigating rectal toxicity associated dosimetric features with deformable accumulated rectal surface dose maps for cervical cancer radiotherapy

Synthesis of Vibegron Enabled by a Ketoreductase Rationally Designed for High pH Dynamic Kinetic Reduction

Synthesis of Vibegron Enabled by a Ketoreductase Rationally Designed for High pH Dynamic Kinetic Reduction

Influence of tube potential on quantitative coronary plaque analyses by low radiation dose computed tomography: a phantom study

Column sufficient tensors and tensor complementarity problems

The Impact of Ecological Construction Programs on Grassland Conservation in Inner Mongolia, China

A new simultaneous iterative method with a parameter for solving the extended split equality problem and the extended split equality fixed point problem

An alternative extragradient projection method for quasi-equilibrium problems

A semidefinite program approach for computing the maximum eigenvalue of a class of structured tensors and its applications in hypergraphs and copositivity test

Transplantation routes affect the efficacy of human umbilical cord mesenchymal stem cells in a rat GDM model

Inducible knockout of Syncytin-A gene leads to an extensive placental vasculature deficiency, implications for preeclampsia

Construction of a versatile expression library for all human single-pass transmembrane proteins for receptor pairings by high throughput screening

On computing minimal H-eigenvalue of sign-structured tensors

Copositive tensor detection and its applications in physics and hypergraphs

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