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| 1 | Effect of circumferential strain rate on dynamic recrystallization and texture of Mg-13Gd-4Y-2Zn-0.5Zr alloy during rotary backward extrusion显示文摘Gleeble-3500 thermal simulator was applied to realize the rotary backward extrusion forming of Mg-13Gd-4Y-2Zn-0.5Zr(wt%)alloy at different circumferential strain rate from 0.009 s^(-1)to 0.027 s^(-1)at 400℃and the dynamic recrystallization mechanism and texture evolution were studied.The results show that the grain size of the alloy was obviously refined after rotary backward extrusion.As the circumferenlial strain rate increased,the dynamic recrystallization fraction gradually increased causing the grain size decreased and the distribution of microstructure became more uniform.At the same time,the texture of{0001},{10-10},{11-20}was weakened and the grain orientation distribution became more random.With the increase of circumferential strain rate,the discontinuous dynamic recrystallization mechanism became dominant,which promoted the weakening of texture and grain refinement of the alloy. | Yingze Meng Jianmin Yu Guanshi Zhang Yaojin Wu Zhimin Zhang Zheng Shi | 2020 | Journal of Magnesium and Alloys2020，8，4： | 7 |
| 2 | Wideband tunable passively Q-switched fiber laser at 2.8 μm using a broadband carbon nanotube saturable absorber显示文摘We propose and demonstrate a widely tunable passively Q-switched Ho^(3+)∕Pr^(3+)-codoped ZrF_4-BaF_2-LaF_3-AlF_3-NaF fiber laser operating in the 2.8 μm mid-infrared(MIR) waveband based on a single-walled carbon nanotube(SWCNT) saturable absorber(SA). The SWCNTs have diameters ranging from 1.4 to 1.7 nm. The modulation depth and saturation intensity of the SWCNT SA measured at 2850 nm are 16.5% and 1.66 MW∕cm^2, respectively. Stable Q-switched pulses with the shortest pulse duration of 1.46 μs and the maximum pulse energy of 0.43 μJ are achieved at a launched pump power of 445.6 mW. The combined use of a broadband SWCNT SA and a plane ruled grating ensures a broad continuously tuning range of 55.0 nm from 2837.6 to 2892.6 nm.The output powers, emission spectra, repetition rates, and pulse durations at different tuning wavelengths are also characterized and analyzed. Our results indicate that SWCNTs can be excellent broadband SAs in the 3 μm MIR region. To the author's knowledge, this is the first demonstration of a widely tunable carbon-nanotubeenabled passively Q-switched fiber laser operating in the 2.8 μm MIR waveband. | YANJIA Lü CHEN WEI HAN ZHANG ZHE KANG GUANSHI QIN YONG LIU | 2019 | Photonics Research2019，7，1： | 5 |
| 3 | Kinetics model for leaching of ion-adsorption type rare earth ores显示文摘This paper aims to establish a mathematical model that can analyze the whole leaching kinetics process of ion-adsorption type rare earth ores.This leaching process is composed of three steps:(1)ammonium ions arrive at the ore particle surface through the diffusion layer;(2)ammonium ions exchange with rare earth ions;and(3)rare earth ions enter into the external solution through the diffusion layer.In the leaching process,it is hypothesized that the ore particle size remains constant The process of ammonium ions and rare earth ions passing through the diffusion layer was described by the Fick law,and the reversible ion exchange process between ammonium ions and rare earth ions was described by the Kerr model,A leaching kinetics model of rare earth ions by ammonium ions was constructed.Accuracy of this kinetics model was verified with laboratory tests.It is found that the correlation coefficients of all data are greater than 0.9000.The proposed kinetics model is therefore feasible for kinetics analysis throughout the leaching process. | Ping Long Guanshi Wang Chao Zhang Yaojie Yang Xiaojing Cao Zibo Shi | 2020 | Journal of Rare Earths2020，38，12： | 5 |
| 4 | Ultraflat, broadband, and highly coherent supercontinuum generation in all-solid microstructured optical fibers with all-normal dispersion显示文摘High flatness, wide bandwidth, and high-coherence properties of supercontinuum(SC) generation in fibers are crucial in many applications. It is challenging to achieve SC spectra in a combination of the properties, since special dispersion profiles are required, especially when pump pulses with duration over 100 fs are employed. We propose an all-solid microstructured fiber composed only of hexagonal glass elements. The optimized fiber possesses an ultraflat all-normal dispersion profile, covering a wide wavelength interval of approximately 1.55 μm. An SC spectrum spanning from approximately 1030 to 2030 nm(corresponding to nearly one octave) with flatness<3 dB is numerically generated in the fiber with 200 fs pump pulses at 1.55 μm. The results indicate that the broadband ultraflat SC sources can be all-fiber and miniaturized due to commercially achievable 200-fs fiber lasers. Moreover, the SC pulses feature high coherence and a single pulse in the time domain, which can be compressed to 13.9-fs pulses with high quality even for simple linear chirp compensation. The Fourier-limited pulse duration of the spectrum is 3.19 fs, corresponding to only 0.62 optical cycles. | CHUNLEI HUANG MEISONG LIAO WANJUN BI XIA LI LILI HU LONG ZHANG LONGFEI WANG GUANSHI QIN TIANFENG XUE DANPING CHEN WEIQING GAO | 2018 | Photonics Research2018，6，6： | 4 |
| 5 | A two-parameter model for ion exchange process of ion-adsorption type rare earth ores显示文摘The establishment of a mathematical model for the ion exchange process is key to creating a theoretical basis for the mining of ion-adsorption type rare earth ores.Ore samples from Xinfeng,Xunwu and Anyuan were used as the test ore samples in the present study and equilibrium batch tests of ore sample leaching using various ammonium sulfate concentrations were performed.The results show that,after leaching,there is a negative exponential relationship between the ratio of the solid-phase rare earth ion concentration to the aqueous-phase rare earth ion concentration and the initial ammonium ion concentration.However,there is a linear relationship between the natural logarithm of the ratio of the solidphase ammonium ion concentration to the aqueous-phase ammonium ion concentration and the initial ammonium ion concentration.Based on the above two functional relationships,a two-parameter model for the equilibrium ion exchange process of ion-adsorption type rare earth ores was established.Using the established model to analyze the test data the model error for the Xunwu ore sample is found to be less than 5%.The proposed model is more accurate compared with the Kerr model.The two-parameter model proposed in this study provides theoretical support for the numerical simulation of column leaching(in-situ leaching)of ion-adsorption type rare earth ores. | Ping Long Guanshi Wang Chao Zhang Ying Huang Sihai Luo | 2020 | Journal of Rare Earths2020，38，11： | 4 |
| 6 | Passively Q-switched erbium doped fiber laser using a gold nanostars based saturable absorber显示文摘In this paper, we propose and demonstrate an all-fiber passively Q-switched erbium doped fiber laser(EDFL) by using gold nanostars(GNSs) as a saturable absorber(SA) for the first time, to the best of our knowledge. In comparison with other gold nanomorphologies, GNSs have multiple localized surface plasmon resonances, which means that they can be used to construct wideband ultrafast pulse lasers. By inserting the GNS SA into an EDFL cavity pumped by a 980 nm laser diode, a stable passively Q-switched laser at 1564.5 nm was achieved for a threshold pump power of 40 mW. By gradually increasing the pump power from 40 to 120 mW, the pulse duration decreases from 12.8 to 5.3 μs and the repetition rate increases from 10 to 17 kHz. Our results indicate that the GNSs are a promising SA for constructing pulse lasers. | ZHE KANG MINGYI LIU ZHENWEI LI SIQING LI ZHIXU JIA CHENGZHI LIU WEIPING QIN GUANSHI QIN | 2018 | Photonics Research2018，6，6： | 2 |
| 7 | Microstructure evolution,texture and mechanical properties of a Mg-Gd-Y-Zn-Zr alloy fabricated by cyclic expansion extrusion with an asymmetrical extrusion cavity:The influence of passes and processing route显示文摘In the present work,two processing routes(A and B)with 3 CEE-AEC passes are performed on Mg-13 Gd-4 Y-2 Zn-0.4 Zr alloys,and the resultant microstructure evolution,texture analysis and mechanical properties are investigated systematically.The core difference between the two processing routes is the orientation between the expansion and extrusion steps,i.e.,they are parallel to each other for on route A and perpendicular to each other for route B.The results show that a remarkable grain refinement is achieved via both processing routes due to dynamic recrystallization(DRX).Fine equiaxed grains are observed in the samples processed with route B with a final size of 3.6±0.4μm compared to the grain size of 4.5±0.5μm with route A.With an increasing number of CEE-AEC passes,the overall texture intensity decreases,and the basal texture gradually changes to the mixed texture components.The shear deformation introduced by the asymmetrical extrusion cavity promotes a broad angular distribution of the basal planes on routes A and B,leading to an obvious increase in the Schmid factor for the activation of the basal a slip system.The tensile test at ambient temperature reveals that the comprehensive mechanical properties are improved,and the conventional mechanical anisotropy of as-received alloys is alleviated by successive CEE-AEC processing,which is mainly derived from the competitive balance relation between the grain refinement and texture modification. | Zhaoming Yan Xubin Li Jie Zheng Zhimin Zhang Qiang Wang Kaihua Xu Hongzhi Fan Guanshi Zhang Jiaxuan Zhu Yong Xue | 2021 | Journal of Magnesium and Alloys2021，9，3： | 2 |
| 8 | Occurrence of retained placenta is preceded by an inflammatory state and alterations of energy metabolism in transition dairy cows显示文摘Background: Failure to expel fetal membranes within 24 h of calving is a pathological condition defined as retained placenta(RP). The objective of this investigation was to evaluate whether there are alterations in several selected serum variables related to innate immunity and carbohydrate and lipid metabolism that precede occurrence of RP in transition Holstein dairy cows.Methods: One hundred multiparous Holstein dairy cows were involved in the study. Blood samples were collected from the coccygeal vein during the-8 to +4 wks around parturition, once per week before the morning feeding.Six healthy control cows(CON) and 6 cows with RP were selected and serum samples at-8,-4, time of diagnosis of disease, and +4 wks relative to parturition were used for analyses. All samples were analyzed for lactate, nonesterified fatty acids(NEFA), β-hydroxybutyrate(BHBA), interleukin-1(IL-1), interleukin-6(IL-6), tumor necrosis factor(TNF), haptoglobin(Hp), and serum amyloid A(SAA).Results: Cows with RP had greater concentrations of serum lactate, IL-1, IL-6, TNF, and SAA in comparison with CON cows. Intriguingly, elevated concentrations of all five variables were observed at-8 and-4 wks before the occurrence of RP compared to healthy cows. Cows with RP also had lower DMI and milk production vs CON animals; however milk composition was not affected by RP.Conclusions: Cows with RP showed an activated innate immunity 8 wks prior to diagnosis of disease. Overall results suggest that serum IL-1, IL- 6, and TNF, and lactate can be used as screening biomarkers to indicate cows that might have health issues during the transition period. | Elda Dervishi Guanshi Zhang Dagnachew Hailemariam Suzana M.Dunn Burim N.Ametaj | 2016 | Journal of Animal Science and Biotechnology2016，7，3： | 2 |
| 9 | Photoluminescence from surfactant-assembled Y2O3:Eu nanotubes显示文摘 | Wu Changfeng Qin Weiping Qin Guanshi | 2003 | Appl Phys Lett2003，82，： | 1 |
| 10 | Ultrabroadband supercontinuum generation from ultraviolet to 6,28 μm in a fluoride fiber显示文摘 | Qin Guanshi Yan Xin Kito C | 2009 | Ap plied Physics Letter2009，95，16： | 1 |
| 11 | Stimulated Brillouin scattering in a single-mode Tellurite fiber for amplification, lasing, and slow light generation 显示文摘 | QIN Guanshi SOTOBAYASHI H TSUCHIYA M | 2008 | Lightw Teehnol2008，26，5： | 1 |
| 12 | Widely Tunable Ring-Cavity Tellurite Fiber Raman Laser显示文摘 | Qin Guanshi Liao Meisong Suzuki T | | 0，，17： | 1 |
| 13 | Photoluminescence from surfactant-assembled Y2O3 : Eu nanotubes显示文摘 | WU CHANGFENG QIN WEIPING QIN GUANSHI etal | 2003 | Appl Phys Lett2003，82，4： | 1 |
| 14 | Optical Amplification at 1525 nm in BaYF5: 20% Yb3+, 2% Er3+ Nanocrystals Doped SU-8 Polymer Waveguide显示文摘 | Pengcheng Zhao Meiling Zhang Tianjiao Wang Xinyang Liu Xuesong Zhai Guanshi Qin Weiping Qin Fei Wang Daming Zhang Tong Zhang | 2014 | Journal of Nanomaterials2014，，： | 1 |
| 15 | Photoluminescence from suHactant-assembled Y2O3 : Eu nanotubes显示文摘 | WU Changfeng QIN Weiping QIN Guanshi etal | 2003 | Appl Phys Lett2003，82，4： | 1 |
| 16 | Infrared-to-visible upconversion luminescence of Er^3+ and Yb^3+ co-doped germanate glass显示文摘 | Guanshi Qin Weiping Qin Changfeng Wu | 2004 | J Non-Cryst Solids2004，347，： | 1 |
| 17 | Synthe sis and upconversion properties of Ln3+ doped YOF nanofibers显示文摘 | Yang Renyuan Qin Guanshi Zhao Dan | 2012 | J Fluorine Chem2012，140，： | 1 |
| 18 | “Steiner trees” between cell walls of sisal显示文摘Through careful analysis on the cross-section of sisal fibers, it is found that the middle lamellae between the cell walls have clear geometric characteristics: between the cell walls of three neighboring cells, the middle lamellae form a three-way junction with 120° symmetry. If the neighboring three-way junctions are connected, a network of Steiner tree with angular symmetry and topological invariability is formed. If more and more Steiner trees are connected, a network of Steiner rings is generated. In another word, idealized cell walls and the middle lamellae are dominated by the Steiner geometry. This geometry not only depicts the geometric symmetry, the topological invariability and minimal property of the middle lamellae, but also controls the mechanics of sisal fibers. | LI GuanShi YIN YaJun LI Yan ZHONG Zheng | 2009 | Chinese Science Bulletin2009，54，18： | 1 |
| 19 | Upconversion luminescence of Er3+ in highly transparent YAG ceramics显示文摘 | Guanshi Qin Jianren Lu J F Bisson | 2004 | Solid State Communications2004，132，： | 1 |
| 20 | Upconversion luminescence of Er3+ in highly transparent YAG ceramics 显示文摘 | Qin Guanshi Lu Jianren Bisson J F | 2004 | Solid State Commun2004，132，： | 1 |
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