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Light Trapping Effect in Wing Scales of Butterfly Papilio peranthus and Its Simulations

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Journal of Bionic Engineering 2013年第2期10卷 162-169页

作者： Zhiwu han Shichao niu Lufeng Zhang Zhenning Liu Luquan Ren Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China

Broadband light trapping effect and arrays of sub-wavelength textured structures based on the butterfly wing scales are applicable to solar cells and stealth technologies. In this paper, the fine optical structures in wing scales of butterfly Papilio peranthus, exhibiting efficient light trapping effect, were carefully examined. First, the reflectivity was measured by reflectance spectrum. Field Emission Scanning Electronic Microscope （FESEM） and Transmission Electron Microscope （TEM） were used to observe the coupling morphologies and structures of the scales. Then, the optimized 3D model of the coupling structure was created combining Scanning Electron Microscope （SEM） and TEM data. Afterwards, the mechanism of the light trapping effect of these structures was analyzed by simulation and theoretical calculations. A multilayer nano-structure of chitin and air was found. These structures are effective in increasing optical path, resulting in that most of the incident light can be trapped and adsorbed within the structure at last. Furthermore, the simulated optical results are consistent with the experimental and calculated ones. This result reliably confirms that these structures induce an efficient light trapping effect. This work can be used as a reference for in-depth study on the fabrication of highly efficient bionic optical devices, such as solar cells, photo detectors, high-contrast, antiglare, and so forth.

关键词： butterfly wing scale light trapping structures biomimetic functional surfaces

Adsorption Properties of Calcined Modified Sepiolite on SO4^2- and Cl^-

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Journal of Wuhan University of Technology(Materials Science) 2020年第1期35卷 32-41页

作者：孙凯利王彩辉 ZhanG Guanglei niu han FU Shifeng WU Yueze YANG Jinhui State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Hebei Institute of Technology Co. Ltd.ShiJiaZhuang 050021China

Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(SEM), BET(specific surface area from N2 adsorption isotherms), mercury intrusion porosimetry(MIP), and infrared spectroscopic analysis(IR), respectively. The results show that the adsorption performance of sepiolite can be changed by calcination and environment temperatures, especially for calcination. The adsorption capacity of sepiolite fiber is bigger than that of Type A and B, and adsorption capacity of each sepiolite to sulfate is smaller than that of the chloride ions. Especially, the maximum value for adsorption of the sepiolite fibers, calcined at 600 ℃ and water bath at 60 ℃, to chlorine ion and sulfate are 5.95 and 5.71 mg/g, respectively(mg/g : the ions quantity adsorbed by a unit of sepiolite weight). The minimum adsorption of calcined sepiolite fiber to sulfate ions increased from 5.02 to 5.55 mg/g. While microstructure analysis of sepiolite by TG indicated that its structure was, for temperature not exceeding 700 ℃, was not changed significantly. Sepiolite has a porous structure, especially for sepiolite fiber, which can be observed by SEM. BET indicates that sepiolite fiber has a larger pore volume than others and this can be increased by calcination. IR shows that the adsorption of sepiolite to Cl-and SO42- belongs to physical absorption, instead of chemisorption.

关键词： adsorption chloridion sepiolite sulfate ion temperature

Current status and future prospects of stem cell therapy in Alzheimer’s disease

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Neural Regeneration Research 2020年第2期15卷 242-250页

作者： Fu-Qiang Zhang Jin-Lan Jiang Jing-Tian Zhang han niu Xue-Qi Fu Lin-Lin Zeng Scientific Research Centre of China-Japan Union Hospital Jilin UniversityChangchunJilin ProvinceChina School of Life Sciences Jilin UniversityChangchunJilin ProvinceChina

Alzheimer’s disease is a common progressive neurodegenerative disorder, pathologically characterized by the presence of β-amyloid plaques and neurofibrillary tangles. Current treatment approaches using drugs only alleviate the symptoms without curing the disease, which is a serious issue and influences the quality of life of the patients and their caregivers. In recent years, stem cell technology has provided new insights into the treatment of neurodegenerative diseases, including Alzheimer’s disease, Parkinson’s disease, and amyotrophic lateral sclerosis. Currently, the main sources of stem cells include neural stem cells, embryonic stem cells, mesenchymal stem cells, and induced pluripotent stem cells. In this review, we discuss the pathophysiology and general treatment of Alzheimer’s disease, and the current state of stem cell transplantation in the treatment of Alzheimer’s disease. We also assess future challenges in the clinical application and drug development of stem cell transplantation as a treatment for Alzheimer’s disease.

关键词： Alzheimer's disease β-amyloid drug development embryonic stem cells induced pluripotent stem cells mesenchymal stem cells nerve regeneration neural regeneration neural stem cells neurodegenerative disorders stem cell therapy

Optimization of Supercontinuum Sources for Ultra-Broadband T-CARS Spectroscopy

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Chinese Physics Letters 2011年第3期28卷 78-80页

作者： LIU Xing LIU Wei YIN Jun QU Jun-Le LIN Zi-Yang niu han-Ben Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060 College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072

For a typical photonic crystal fiber with two zero-dispersion wavelengths,we theoretically demonstrate a new way to generate supercontinuum using an input pulse of 30fs duration and lOkW peak power for providing a compact and cost effective light source to the ultra-broadband time-resolved coherent anti-Stokes Raman scattering spectroscopy.

关键词： spectroscopy continuum coherent

Comparative transcriptomic evidence of physiological changes and potential relationships in vertebrates under different dormancy states

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Zoological Research 2024年第2期45卷 341-354页

作者： Yu-han niu Li-Hong Guan Cheng Wang Hai-Feng Jiang Guo-Gang Li Lian-Dong Yang Shun-Ping He State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China College of Life Sciences Qinghai Normal UniversityXiningQinghai 810008China Academy of Plateau Science and Sustainability Qinghai Normal UniversityXiningQinghai 810016China Key Laboratory of Biodiversity Formation Mechanism and Comprehensive Utilization of the Qinghai-Tibet Plateau in Qinghai Province Qinghai Normal UniversityXiningQinghai 810008China College of Life Sciences and Technology Xinxiang Medical UniversityXinxiangHenan 453003China College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi 712100China

Dormancy represents a fascinating adaptive strategy for organisms to survive in unforgiving *** a period of dormancy,organisms often exhibit exceptional *** period is typically divided into hibernation and aestivation based on seasonal ***,the mechanisms by which organisms adapt to their environments during dormancy,as well as the potential relationships between different states of dormancy,deserve further ***,we selected Perccottus glenii and Protopterus annectens as the primary subjects to study hibernation and aestivation,*** on histological and transcriptomic analysis of multiple organs,we discovered that dormancy involved a coordinated functional response across *** analyses revealed noteworthy disparities between the two dormant species in their responses to extreme ***,similarities in gene expression patterns pertaining to energy metabolism,neural activity,and biosynthesis were noted during hibernation,suggesting a potential correlation between hibernation and *** further explore the relationship between these two phenomena,we analyzed other dormancy-capable species using data from publicly available *** comparative analysis revealed that most orthologous genes involved in metabolism,cell proliferation,and neural function exhibited consistent expression patterns during dormancy,indicating that the observed similarity between hibernation and aestivation may be attributable to convergent *** conclusion,this study enhances our comprehension of the dormancy phenomenon and offers new insights into the molecular mechanisms underpinning vertebrate dormancy.

关键词： Hibernation Aestivation Multi-organs Convergent evolution

A CARLEMAN ESTIMATE ON GROUPS OF HEISENBERG TYPE

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Journal of Partial Differential Equations 2006年第4期19卷 341-358页

作者： han Junqiang niu Pengcheng Department of Applied Mathematics Northwestern Polytechnical University Xi'an 710072 China

A Pohozaev-Rellich type identity for the p-sub-Laplacian on groups of Heisenberg type, G, is given. A Carleman estimate for the sub-Laplacian on G is established and, as a consequence, a unique continuation result is ... 详细信息

关键词： Pohozaev-Rellich type identity Carleman estimate unique continuation sub-Laplacian group of Heisenberg type.

Superplasticity in an Aluminum Alloy 6061/Al_2O_3p Composite

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Journal of Materials Science & Technology 2001年第6期17卷 653-656页

作者： Lihong han, Jitai niu and Darning JIANG The National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China Tsunernichi Imai National Industrial Research Harbin Inst Technol Natl Key Lab Adv Welding Prod Technol Harbin 150001 Peoples R China Natl Ind Res Inst Nagoya Kita Ku Nagoya Aichi 462 Japan

The superplasticity of an Al203p/6061Al composite, fabricated by powder metallurgy techniques, has been investigated. Instead of any special thermomechanical processing or hot rolling, simple hot extrusion has been employed to obtain a fine grained structure before superplastic testing. Superplastic tensile tests were performed at strain rates ranging from 10-2 to 10-4 s-1 and at temperatures from 833 to 893 K. A maximum elongation of 200% was achieved at a temperature of 853 K and an initial strain rate of 1.67×103 s-1. The highest value obtained for the strain rate sensitivity index (in) was 0.32. Differential scanning calorimeter was used to ascertain the possibility of any partial melting in the vicinity of optimum superplastic temperature. These results suggested that no liquid phase existed where maximum elongation was achieved and deformation took place entirely in the solid state.

关键词： Al Superplasticity in an Aluminum Alloy 6061/Al2O3p Composite rate high DSC Figure

Incompressible Surfaces in Almost Alternating Link Exteriors

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Chinese Quarterly Journal of Mathematics 2007年第4期22卷 621-626页

作者： han You-fa niu Fang-ping ZhanG Fang School of Mathematics Liaoning Normal University Dalian 116029 China

In this paper, we discuss mainly the properties of incompressible pairwise incomprcssiblc surfaccs in ahnost altcrnating link complcmcnts. Lct L bc a almost link and lct F be an incompressible pairwise incompressible surface in S^3 - L. First, we give the properties that the surface F intersects with 2-spheres in S^3- L. The intersection consisting of a collection of circles and saddle-shaped discs is called a topological graph. One can compute the Euler Characteristic number of the surface by calculating the characteristic number of the graph. Next, we prove that if the graph is special simple, then the genus of the surface is zero.

关键词： ahnost alternating link incompressible pairwise incompressible surface standard position zenus

SOD1^(G93A) Induces a Unique PSAP-Dependent Mitochondrial Apoptosis Pathway via Bax-Bak Interaction

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BIOCELL 2021年第4期45卷 963-970页

作者： han niu XIN CHEN XUEQI FU JINGTIAN ZhanG GUODONG LI YUXIANG WANG JIAYUE SONG XUETING MA CHEN HU XUEMIN XU FUQIANG ZhanG LINLIN ZENG Edmond H.Fischer Signal Transduction Laboratory College of Life SciencesJilin UniversityChangchun130012China Scientific Research Centre of China-Japan Union Hospital Jilin UniversityChangchun130033China Department of Biology College of Arts and SciencesUniversity of Texas of the Permian BasinOdessaTX 79762USA Department of General Surgery The Second Hospital of Jilin UniversityChangchun130041China School of Life Sciences and Technology Tongji UniversityShanghai200092China

Amyotrophic lateral syndrome(ALS)is a progressive degenerative disorder characterized by motor neuron death and axon *** dysfunction plays a key role in the pathogenesis of ALS,the mechanism of which remains poorly *** B-cell lymphoma-2(Bcl-2)family of proteins that control and mediate mitochondrial function and apoptosis,including the pro-apoptotic members Bcl2-Associated X(Bax),are involved in ALS *** death receptor 6(DR6)regulates motor neuron death in ALS,and DR6 antibodies can prevent axon degeneration and motor neuron damage by blocking *** studies demonstrated that PSAP localized to mitochondria and was required for DR6-induced *** this study,SOD1^(G93A) was transfected into the motor neuron cell line NSC-34 to serve as an ALS cell model in *** data assessed the role of PSAP in SOD1^(G93A)induced apoptosis and demonstrated that the overexpression of SOD1^(G93A),but not wtSOD1,induced PARP cleavage,caspase-3 activation,cytochrome c release,and Bax ***,Bax,and Bak were necessary for SOD1^(G93A)induced apoptosis,as silencing PSAP inhibited SOD1^(G93A)-mediated cell death that was dependent on Bax-Bak interaction.

关键词： ALS Bax Mitochondria PSAP SOD1^(G93A)