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Journal of Materials Science & Technology 2020年第15期47卷 153-161页

作者： liang lan Xinyuan Jin Shuang Gao Bo He Yonghua Rong Research Center of High-temperature Alloy Precision Forming School of Material EngineeringShanghai University of Engineering ScienceShanghai 201620China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

This work characterizes microstructural evolutions of electron beam melted(EBM) Ti-6 Al-4 V alloy modified via laser shock peening(LSP).The depth stress distribution and tensile properties of EBM Ti-6 Al-4 V alloy were measured before and after *** results indicate that microstructure consists of β phase with 7.2%±0.4% vol.% and balance α lamellar in EBM sample,and the α lamella was refined into nano-equiaxed grains and submicro-equiaxed grains after *** dominant refinement mechanism is revealed during *** faults were found in the LSP-treated sample,and their corresponding planes were determined as(0001) basal plane,(1010) prismatic plane,and(1011) pyramidal plane obtained by high resolution transmission electron *** subgrains and high-angle grains formed during dynamic recrystallization were identified by selected area electron diffraction *** LSP treatment produces a significantly residual compressive stress approximately-380 MPa with the depth of compressive stress layer reaching 450 μ*** and elongation of the EBM sample were significantly increased after *** strength and ductility enhancements are attributed to compre s sive stress,grain refinement and grain gradient distribution of α phase.

关键词： Electron beam melting Ti-6Al-4V alloy Laser shock peening Microstructural evolution Stress state Mechanical properties

Influence of multiple laser shock peening treatments on the microstructure and mechanical properties of Ti-6Al-4V alloy fabricated by electron beam melting

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International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1780-1787页

作者： liang lan Ruyi Xin Xinyuan Jin Shuang Gao Bo He School of Material Engineering Shanghai University of Engineering ScienceShanghai 201620China Research Center of High-temperature Alloy Precision Forming Shanghai University of Engineering ScienceShanghai 201620China

Laser shock peening(LSP)is an attractive post-processing method to tailor surface microstructure and enhance mechanical performances of additive manufactured(AM)*** effects of multiple LSP treatments on the microstructure and mechanical properties of Ti-6Al-4V part produced by electron beam melting(EBM),as a mature AM process,were studied in this ***,surface topography,residual stress,and tensile performance of EBM-manufactured Ti-6Al-4V specimens were systematically analyzed subjected to different LSP *** distribution of porosities in EBM sample was assessed via X-ray computed *** results showed that EBM samples with two LSP treatments possessed a lower porosity value of 0.05%compared to the value of 0.08%for the untreated *** strength of EBM samples with two LSP treatments was remarkably raised by 12%as compared with the as-built *** grains ofαphase were refined in near-surface layer,and a dramatic increase in the depth and magnitude of compressive residual stress(CRS)was achieved in EBM sample with multiple LSP *** grain refinement ofαphase and CRS with larger depth were responsible for the strength enhancement of EBM samples with two LSP treatments.

关键词： additive manufacturing laser shock peening electron beam melting residual stress Ti-6Al-4V alloy mechanical properties

Study of viruses co-infecting white clover(Trifolium repens)in China

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Journal of Integrative Agriculture 2017年第9期16卷 1990-1998页

作者： liang Qiao-lan WEI Lie-xin XU Bing-liang A.Calderón-Urrea XIANG Dong College of Plant Protection Gansu Agricultural UniversityLanzhou 730070P.R.China Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province Lanzhou 730070P.R.China Department of Biology California State UniversityFresnoCA 93740USA

Globally, white clover（Trifolium repens L.） is commonly infected by plant viruses. It is grown at gardens, roadsides, and public areas as ornamental plants in northern China. Some leaves present disease symptoms that are similar to those of virus infection. However, to our knowledge, no records are available from China regarding white clover（Trifolium repens L.） virus co-infection. To determine the viral species that infect white clover in China, plant samples with virus disease symptoms were collected and virion morphology and ultrastructure morphology of co-infected plants were observed by electron microscopy; viruses were detected by enzyme linked immunosorbent assay（ELISA） and reverse transcription PCR（RT-PCR）. Virus co-infection was studied by double antibody sandwich enzyme linked immunosorbent assay（DAS-ELISA） and real-time fluorescence quantitative PCR（RT-q PCR） after rub-inoculation of virus-free white clover planted in a growth chamber（25°C） with a photoperiod of 16 h, using single or several purified virions. Results showed that there were six types of symptoms, including those of shrinking mosaic, shrinking and macular mosaic, severe mottle mosaic, yellow macular mosaic, shrinkage chlorisis, and ring plaque and ring stria. The incidence rates for each symptom were 20.93, 1.48, 16.85, 59.07, 1.30, and 0.37%, respectively, based on the field investigation. Two types of viral pathogens were identified as Alfalfa mosaic virus（AMV） and White clover mosaic virus（WCMV）. In mesophyll cells, virus particles with bacilliform virions formed aggregates and linear virions were bundle shaped. The detection rate of AMV was 100% in white clover samples by DAS-ELISA and RT-PCR detection, whereas that of WCMV was 83.33%. The co-infection rate was 83.33%. The relative contents of AMV and WCMV were significantly increased by 5.897-and 3.515-fold upon co-infection, when compared to that with single virus infection. We observed larger starch particles and fewer or collapsed c

关键词： clover AMV WCMV viral co-infection virus-induced pathological changes DAS-ELISA RT-PCR RT-qPCR

Ultrabroad Terahertz Bandpass Filter Based on a Multiple-Layered Metamaterial with Flexible Substrates

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Chinese Physics Letters 2012年第9期29卷 84-86页

作者： liang lan-Ju YAO Jian-Quan YAN Xin College of Opto-electronics Engineering Zaozhuang UniversityZaozhuang 277160 College of Precision Instrument and Opto-electronics Engineering Institute of Laser and Opto-electronicsTianjin UniversityTianjin 300072 Key Laboratory of Opto-electronics Information Technology(Ministry of Education) Tianjin UniversityTianjin 300072

An ultrabroad and sharp transition bandpass flexible terahertz(THz)filter is designed using a multiple-layered *** bandpass filter has excellent filtering capability,with a 3 dB bandwidth of about 0.47 THz and sharp band-edge transitions of 80 dB/THz and 96 dB/THz,respectively,and it can be realized by a coupling individual resonance *** find that the geometry parameters have an influence on the transmission profile,which are capable of giving us meaningful guidance in design of high profile bandpass THz *** numerical results show that the multiple-layered flexible metamaterial provides an effective way to achieve ultrabroad THz devices.

关键词： sharp layered meaningful

Study of the best decocting time of sun dried ginseng by using the hyperspectral imaging technology

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Journal of Innovative Optical Health Sciences 2016年第6期9卷 21-25页

作者： Qing He lan liang Zhenqiang Chen Qichang Pang Jing Zhao Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou 510630P.R.China Department of Biomedical Engineering Guangdong Medical College Dongguan 523808 P.R.China College of Science South China Agricultural University Guangzhou 510640P.R.China

In this research,a new method based on the hyperspectral imaging for searching the best decocting time of sun dried ginseng is *** spectral images at diferent decocting time of test sample have been taken by the st aring hyperspectral fAuorescence imaging systen and the solubility of active ingredients have been discussed by analyzing the changes on the *** spectr al range of the system is 400-720nm and the spectral resolution is *** the decocting process,the active ingredients of nonsoaked ginseng was dissolved in the tissue fluid at first,and reached equilibrium condition at last after the precipitation-dissolution reciprocating process of *** last,the experiment al results show that the best decoction time of sun dried ginseng is about 60 min after boiling.

关键词： Sun dried ginseng active ingredients decocting time hyperspectral imaging characteristic spectrum characteristic peaks

Microstructural Evolution and Mechanical Properties of Nb-Ti Microalloyed Pipeline Steel

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Journal of Iron and Steel Research International 2011年第2期18卷 57-63页

作者： lan liang-yun QIU Chun-lin ZHAO De-wen GAO Xiu-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The correlation between microstructures and mechanical properties of a Nb-Ti microalloyed pipeline steel was investigated. The results revealed that with decreasing the finish rolling temperature and the cooling stop tern perature, the matrix microstructure was changed from quasi-polygonal ferrite to acicular ferrite, as a result of improvement of both strength and low temperature toughness. By means of electron backscattered diffraction observation, an effective acicular ferrite packet contained several low angle boundaries or subboundaries plates which made important contributions to improvement of strength. It was found that many fine quasi-polygonal ferrite grains with high angle boundaries as the toughening structure were introduced into the acicular ferrite matrix to refine effective grain size and improve the toughness.

关键词： pipeline steel acicular ferrite mechanical property electron backscattered diffraction

Semi-quantitative analysis on the content of berberine hydrochloride in compound berberine tablets with the fluorescence spectral imaging method

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Journal of Innovative Optical Health Sciences 2016年第2期9卷 79-85页

作者： lan liang Jinyan Sun Qing He Zhenqiang Chen Siqi Zhu Lin Lin Department of Biomedical Engineering Guangdong Medical University Dongguan 523808 P.R.China Department of Optoelectronic Engineering Jinan University Guangzhou 510630P.R.China

The content of berberine hydrochloride(BH)in compound berberine tablets(CBTs)is subject to strict *** content is usually measured based on chemical *** this paper,the fluorescence spectral imaging method was used to study the relative content of BH from a physics *** comparing the relative fluorescence intensity of self-made CBTs with di®erent mass percentages of BH,a linear positive relationship was observed between the BH content and the relative fluorescence intensity,and accordingly the quality of CBTs of different brands was *** results indicate that the fluorescence spectral imaging method can be a simple,fast and nondestructive semi-quantitative analysis method to determine the content of BH in CBTs,and this method has great potential in the quality control of CBTs.

关键词： Fluorescence spectral imaging compound berberine tablet berberine hydrochloride semi-quantitative analysis

Dynamic and Static Recrystallization Behavior of Low Carbon High Niobium Microalloyed Steel

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Journal of Iron and Steel Research International 2011年第1期18卷 55-60页

作者： lan liang yun QIU Chun lin ZHAO De-wen GAO Xiu hua DU Lin-xiu State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The recrystallization behavior of a low carbon high niobium microalloyed steel was investigated using continuous and interrupted hot compression tests. The results showed that the initiation of dynamic recrystallization （DRX） could be detected from inflection in the plot of the strain hardening rate against stress regardless of the stress peak appearance. According to the Zener-Hollomon parameter equation, the activity energy of DRX （Qad） was ob tained and a new modified expression calculating Qdef was proposed in consideration of the chemical composition of experimental steel. Applying the 2% offset method, the static softening fraction was determined. The graphic representation of the softening fraction vs interruption time gave the information about the non-static reerystallization temperature （about 1 000℃ ） and the relationship of precipitation time temperature. Static recrystallization kinetics followed the Avrami＇s law at high deformation temperature, and different values of the exponent m were given to illustrate the effect of niobium element on static recrystallization at different deformation temperatures.

关键词： dynamic recrystallization static recrystallization high niobium microalloyed steel activity energy

Impact Toughness of an NM400 Wear-Resistant Steel

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Journal of Iron and Steel Research International 2013年第8期20卷 72-77页

作者： SONG Hong-yu LI Can-ming lan liang-yun ZHAO De-wen WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Laiwu Iron and Steel Group Co. Ltd.

An NM400 wear-resistant steel was hot rolled and then the plates were heat-treated by direct quenching and tempering （DQT） and reheat quenching and tempering （RQT） techniques, respectively. The Charpy impact test was carried out with an instrumented Charpy impact tester. The microstructure and fracture surface were investiga-ted by a combination of optical microscopy, transmission electron microscopy and scanning electron microscopy methods. It was found that the impact toughness of DQT specimen was much higher than that of RQT specimen. The microstructure of both DQT and RQT specimens was characterized by a mixture of tempered lath martensite and lower hainite. The lower bainite in DQT specimen extended into prior austenite grains and the content was higher than that in RQT specimen. The lower bainite in DOT specimen improved the impact toughness by increasing the proportion of large-angle boundaries and relieving the stress concentration at the crack tip. A number of fine and dis-persed carbides in DQT specimen also contributed to the improvement of the impact toughness.

关键词： impact toughness direct quenching tempering lower bainite martensite packet

Interactions of phenol and benzaldehyde in electrocatalytic upgrading process

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Chinese Chemical Letters 2024年第2期35卷 464-468页

作者： lan liang Chuanbin Wang Xukai Lu Yunan Sun Beibei Yan Ning Li Guanyi Chen Li'an Hou School of Environmental Science and Engineering Tianjin Key Lab of Biomass/Wastes UtilizationTianjin UniversityTianjin 300350China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China Georgia Tech Shenzhen Institute Tianjin UniversityShenzhen 518071China High Tech Inst Beijing Beijing 100085China

Biomass pyrolysis oil can be improved effectively by electrocatalytic hydrogenation(ECH).However,the unclear interactions among different components lead to low bio-oil upgrading efficiency in the conversion ***,benzaldehyde and phenol,as common compounds in bio-oil,were chosen as model *** interactions between the two components were explored in the ECH process by combining experiments and theoretical *** showed that phenol could accelerate the conversion of benzaldehyde in the *** selectivity of benzyl alcohol was increased from 60.9%of unadded phenol to 99.1%with 30 mmol/L phenol concentration at 5 *** inhibited the ECH of *** the presence of benzaldehyde,the conversion rate of phenol was below 10.0%with no cyclohexanone and cyclohexanol formation at 5 *** density functional theory(DFT)calculations revealed that the phenol could promote the adsorption of benzaldehyde and facilitate the targeted conversion of benzaldehyde on the active site by lowering the reaction energy *** research on the interaction between phenol and benzaldehyde in the ECH provides a theoretical basis for the application of ECH in practical bio-oil upgrading.

关键词： Interaction Bio-oil Electrocatalytic hydrogenation Phenol Benzaldehyde