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MODELING PHOTONIC CRYSTALS WITH COMPLEX UNIT CELLS BY DIRICHLET-TO-NEUMANN MAPS

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Journal of Computational Mathematics 2007年第3期25卷 337-349页

作者： Yuexia Huang ya yan lu Department of Mathematics City University of Hong KongKowloonHong KongChina

For a photonic crystal （PhC） of finite size, it is important to calculate its transmission and reflection spectra. For two-dimensional （2-D） PhCs composed of a square lattice of circular cylinders, the problem can be solved by an efficient method based on the Dirichlet-to-Neumann （DtN） map of the unit cell and a marching scheme using a pair of operators. In this paper, the DtN operator marching method is extended to handle 2-D PhCs with complex unit cells and arbitrary lattice structures.

关键词： Photonic crystal Periodic structure Diffractive grating Dirichlet-to-Neumannmap Operator marching.

Some Techniques for Computing Wave Propagation in Optical Waveguides

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Communications in Computational Physics 2006年第6期1卷 1056-1075页

作者： ya yan lu Department of Mathematics City University of Hong KongKowloonHong Kong

Optical wave-guiding structures that are non-uniform in the propagation direction are fundamental building blocks of integrated optical *** simulation of lightwaves propagating in these structures is an essential tool to engineers designing photonic *** this paper,we review recent developments in the most widely used simulation methods for frequency domain propagation problems.

关键词： Optical waveguides operator marching method mode matching method beam propagation method bidirectional propagation methods rational approximations

Dirichlet-to-Neumann Map Method with Boundary Cells for Photonic Crystals Devices

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Communications in Computational Physics 2011年第1期9卷 113-128页

作者： Jianhua Yuan ya yan lu Department of Mathematics Beijing University of Posts and TelecommunicationsBeijing 100876China Department of Mathematics City University of Hong KongKowloonHong Kong

In a two-dimensional(2D)photonic crystal(PhC)composed of circular cylinders(dielectric rods or air holes)on a square or triangular lattice,various PhC devices can be created by removing or modifying some *** existing numerical methods for PhC devices give rise to large sparse or smaller but dense linear systems,all of which are expensive to solve if the device is *** a previous work[*** et al.,Optics Express,16(2008),17383-17399],an efficient Dirichlet-to-Neumann(DtN)map method was developed for general 2D PhC devices with an infinite background PhC to take full advantage of the underlying lattice *** DtN map of a unit cell is an operator that maps the wave field to its normal derivative on the cell boundary and it allows one to avoid computing the wave field in the interior of the unit *** this paper,we extend the DtN map method to PhC devices with a finite background *** there is no bandgap effect to confine the light in a finite PhC,a different technique for truncating the domain is *** enclose the finite structure with a layer of empty boundary and corner unit cells,and approximate the DtN maps of these cells based on expanding the scattered wave in outgoing plane *** method gives rise to a relatively small and sparse linear systems that are particularly easy to solve.

关键词： Photonic crystal Dirichlet-to-Neumann map numerical simulation

Thermoregulated Organic Biphasic Hydrogenation of 1-Octene Catalyzed by Ru/PETPP Complex

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Chinese Chemical Letters 2006年第2期17卷 255-257页

作者： ya Dong lu yan Hua WANG Zi Lin JIN State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012

Thermoregulated organic biphasic system composed of triethylene glycol monomethyl ether （TGME） and n-heptane was first applied to the hydrogenation of 1-octene. Under the optimal conditions： P（H2）=5.0MPa, T=80℃, t=3h, 1-octene/Ru=1000 （molar ratio）, the yield of n-octane reached up to 99.6%. Furthermore, the simply decanted catalyst could be reused for 10 times without apparent loss of catalytic activity.

关键词： Thermoregulated organic biphasic system hydrogenation 1-octene ruthenium.

Rh nanoparticles stabilized by PEG-substituted triphenyl-phosphine:A highly active and recyclable catalyst for aqueous biphasic hydrogenation of benzene

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Chinese Chemical Letters 2010年第9期21卷 1067-1070页

作者： ya Dong lu yan Hua Wang Zi Lin Jin State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 China

Rh nanoparticles stabilized by PEG-substituted triphenyl-phosphine（PETPP,P[C6H4-p-（OCH2CH2）nOH]3） combining double stabilization effects demonstrated high activity and good recyclability in aqueous biphasic hydrogenation of *** value of turnover frequency（TOF） was 3333 h^-***,the rhodium nanoparticle catalyst could be easily recycled for five times without loss in activity.

关键词： Hydrogenation Nanoparticles Rhodium PETPP Aqueous biphasic catalysis

Ultrastructure and electrophysiology of astrocytes differentiated from adult adipose-derived stromal cells

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Chinese Medical Journal 2011年第17期124卷 2656-2660页

作者： OU ya YUAN Xiao-dong CAI ya-nan lu yan-hui Department of Neurology Kailuan General Hospital Hebei United University Tangshan Hebei 063000 China

Background Adipose-derived stromal cell （ADSC） differentiation into neural cells in vitro is becoming widely studied. However, there are few reports on astrocytes following differentiation, and particularly on maturation and electrophysiology. In this study, we used various methods to determine ADSC-derived astrocyte maturity. Methods Chemical induction with isobutylmethylxanthine （IBMX） was used to differentiate adult ADSCs into astrocytes followed by hematoxylin-eosin （HE） staining to observe morphology and transmission electron microscopy for cellular ultrastructure assessment. Immunofluorescence was used to detect expression of neural stem cell marker nestin as well as glial markers glial fibrillary acidic protein （GFAP） and S-100. In addition, we measured membrane potentials in bis-（1,3-dibarbituric acid） trimethine oxanol-labeled ADSCs and astrocytes by stimulation with a high potassium solution under an inverted fluorescence microscope. Finally, cell cycle distribution was detected by flow cytometry. Results Typical astrocyte morphology was shown by HE staining after 48-hour differentiation. Glial fibril was observed with transmission electron microscopy. GFAP and S-100 were not expressed in the control group, but were expressed within 24-hour differentiation and reached a maximum at day 14 with no change up to day 28. Nestin was weakly expressed in control cells and also reached a maximum at day 14 with the percentage of positive cells constant until day 21 followed by a decrease. Differentiated cell membrane potentials after stimulation with potassium were slightly increased, and then gradually declined over time. There was no significant membrane potential change in the control group. Flow cytometry showed that the percentage of cells in G0/G1 phase was 93% and only 5% in S phase. Conclusion ADSCs were differentiated into mature astrocytes with typical characteristics including morphology, ultrastructure, marker protein expression, mature potassium channel

关键词： adult adipose-derived stromal cells differentiate astrocytes ultrastructure membrane potential

Critical new insights into the interactions of hexafluoropropylene oxide-dimer acid(GenX or HFPO-DA)with albumin at molecular and cellular levels

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Journal of Environmental Sciences 2025年第3期149卷 88-98页

作者： Shi-ya Peng ya-Di yang Rong Tian Naihao lu Jiangxi Key Laboratory of Green Chemistry College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China

A key characteristic to be elucidated,to address the harmful health risks of environmental perfluorinated alkyl substances(PFAS),is their binding modes to serum albumin,the most abundant protein in *** oxide-dimer acid(GenX or HFPO-DA)is a new industrial replacement for the widespread linear long-chain ***,the detailed interaction of new-generation short-chain PFAS with albumin is still ***,the binding characteristics of bovine serum albumin(BSA)to GenX were explored at the molecular and cellular *** found that this branched short-chain GenX could bind to BSA with affinity lower than that of legacy linear long-chain perfluorooctanoic acid(PFOA).Site marker competitive study and molecular docking simulation revealed that GenX interacted with subdomain IIIA to form BSA-GenX *** with its weaker affinity to albumin protein,the cytotoxicity of branched short-chain GenX was less susceptible to BSA binding compared with that of the linear long-chain *** contrast to the significant effects of strong BSA-PFOA interaction,the weak affinity of BSA-GenX binding did not influence the structure of protein and the cytotoxicity of *** detailed characterization and direct comparisons of serum albumin interaction with new generation short-chain GenX will provide a better understanding for the toxicological properties of this new alternative.

关键词： GenX Protein binding Albumin Cytotoxicity Risk assessment

BmATAD3A mediates mitochondrial ribosomal protein expression to maintain the mitochondrial energy metabolism of the silkworm, Bombyx mori

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INSECT SCIENCE 2025年第1期32卷 193-208页

作者： Dong, Zhanqi Liao, Nachuan luo, yan Zhang, ya Huang, Liang Chen, Peng lu, Cheng Pan, Minhui Southwest Univ State Key Lab Resource Insects Chongqing Peoples R China Southwest Univ Key Lab Sericultural Biol & Genet Breeding Minist Agr & Rural Affairs Chongqing Peoples R China Southwest Univ State Key Lab Resource Insects Chongqing 400715 Peoples R China

ATAD3A is a mitochondrial membrane protein belonging to the ATPase family that contains the AAA+ domain. It is widely involved in mitochondrial metabolism, protein transport, cell growth, development and other important life processes. It has previously been reported that the deletion of ATAD3A causes growth and development defects in humans, mice and Caenorhabditis elegans. To delve into the mechanism underlying ATAD3A defects and their impact on development, we constructed a Bombyx mori ATAD3A (BmATAD3A) defect model in silkworm larvae. We aim to offer a reference for understanding ATAD3A genetic defects and elucidating the molecular regulatory mechanisms. The results showed that knockout of the BmATAD3A gene significantly affected the weight, survival rate, ATPase production and mitochondrial metabolism of individuals after 24 h of incubation. Combined metabolomics and transcriptomics analysis further demonstrated that BmATAD3A knockout inhibits amino acid biosynthesis through the regulation of mitochondrial ribosomal protein expression. Simultaneously, our findings indicate that BmATAD3A knockout impeded mitochondrial activity and ATPase synthesis and suppressed the mitochondrial oxidative phosphorylation pathway through B. mori mitochondrial ribosomal protein L11 (BmmRpL11). These results provide novel insights into the molecular mechanisms involved in the inhibition of development caused by ATAD3A deficiency, offering a potential direction for targeted therapy in diseases associated with abnormal ATAD3A expression.

关键词： ATAD3A ATPase BmmRpL11 Bombyx mori mitochondrial ribosomal protein

Bifurcations and Spatiotemporal Patterns in the Diffusive Nutrient-Microor ganism Model

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Acta Mathematicae Applicatae Sinica 2025年第1期41卷 162-178页

作者： ya-di WANG Hai-long YUAN yan-ling LI School of Arts and Sciences Shaanxi University of Science and TechnologyXi'an 710021China School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049China School of Mathematics and Information Science Shaanxi Normal UniversityXi'an 710062China

In this paper,the diffusive nutrient-microorganism model subject to Neumann boundary conditions is *** Hopf bifurcations and steady state bifurcations which bifurcate from the positive constant equilibrium of the system are investigated in *** addition,the formulae to determine the direction of Hopf and steady state bifurcations are *** results show the existence of spatially homogeneous/nonhomogeneous periodic orbits and steady state solutions,which indicates the spatiotemporal dynamics of the *** numerical simulations are also presented to support the analytical results.

关键词： nutrient-microorganism model Hopf bifurcation steady state bifurcation simulations