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| 1 | Experimental study of mode distortion induced by stimulated Raman scattering in high-power fiber amplifiers显示文摘The experimental investigation of mode distortion induced by stimulated Raman scattering(SRS)in a high-power fiber amplifier,which includes the evolutions of optical spectra,spatial beam profiles,and time-frequency characteristics,has been carried out in detail.Temporal-frequency characteristics have been studied for the first time,to the best of our knowledge,by using a low-speed camera and high-speed photodiode traces,which revealed that temporal-frequency characteristics of SRS-induced mode distortion are different from traditional dynamic mode instability(MI).The experimental results show that the output beam profile remains stable before the mode distortion occurs and fluctuates obviously after the onset of SRS-induced MI but on a time scale of seconds,which is much lower than that of Yb-gain-induced MI featuring millisecond-level beam profile fluctuation.It also shows that the mode distortion became measurable in company with the onset of inter-mode four-wave mixing(IM-FWM)when the ratio of Raman light reaches 3%;further,the beam quality factor M2degrades gradually from 1.4 to 2.1 as the ratio of Raman light increases.The mode distortion is accompanied by an obvious temperature increase of the output passive fiber,which further confirms that the mode distortion originates from SRS.The cause of the mode distortion induced by SRS has been explained in the context of core-pumped SRS effect,and the investigation on the accompanying IM-FWM effect indicates that the main content of the SRSinduced high-order mode is the LP21 mode. | QIUHUI CHU QIANG SHU ZENG CHEN FENGYUN LI DONGLIN YAN CHAO GUO HONGHUAN LIN JIANJUN WANG FENG JING CHUANXIANG TANG RUMAO TAO | 2020 | Photonics Research2020，8，4： | 6 |
| 2 | Inductive heat property of Fe_3O_4 nanoparticles in AC magnetic field for local hyperthermia显示文摘Magnetite (Fe3O4) nanoparticles with different magnetic properties were prepared by coprecipitation of Fe3+ and Fe2+ with aqueous NaOH solution. The inductive heat properties of Fe3O4 nanoparticles in an alternating current (AC) magnetic field were investigated for local hyperthermia. The maximum saturation magnetization Ms of Fe3O4 nanoparticles is 65.53 emu·g-1 under the optimum conditions of Fe3+: Fe2+ molar ratio at 1.8:1. The Ms of Fe3O4 nanoparticles decreased as the Fe3+/Fe2+ molar ratio increased. But the coercivity Hc increases with the increasing of Fe3+/Fe2+ molar ratio. Exposed in the AC magnetic field for 29 min, the temperatures of physiological saline suspension containing Fe3O4 nanoparticles were 42-97.5 ℃. The inductive heat property of Fe3O4 nanoparticles in AC magnetic field decreases as Hc increases, but increases with the increasing of Ms. The Fe3O4 nanoparticles would be useful as good thermoseeds for localized hyperthermia treatment of cancers. | ZHAO Donglin ZENG Xianwei XIA Qisheng TANG Jintian | 2006 | Rare Metals2006，25，z1： | 5 |
| 3 | Target-fieldmethod for MRI biplanar gradient coil design显示文摘 | Liu Wentao Zu Donglin Tang Xin | 2007 | Appliedphysics2007，40，15： | 1 |
| 4 | Quantitative trait analysis in sequencing studies under trait-dependent sampling显示文摘 | Dan-Yu Lin Donglin Zeng Zheng-Zheng Tang | 2013 | Proceedings of the National Academy of Sciences2013，，： | 1 |
| 5 | Well‐defined Biobased Segmented Polyureas Synthesis via a TBD‐catalyzed Isocyanate‐free Route显示文摘 | Donglin Tang Dirk‐Jan Mulder Bart A. J. Noordover Cor E. Koning | 2011 | Rapid Commun2011，，17： | 1 |
| 6 | Performance of auxiliary antenna-based self-interference cancellation in full-duplex radios显示文摘Dear editor,Full-duplex (FD) wireless communications, which simultaneously transmit and receive on the same frequency resources, have gained considerable research interest for emerging wireless communication [1, 2]. The primary challenge in implementing the FD transceiver is to handle the strong self-interference (SI). The basis of the radio frequency (RF) SI suppression technique is generating/coupling the reference SI signal and subsequently adding it into the receiver channel to suppress the SI signal [3]. The reference SI | Fei WU Qiang XU Shihai SHAO Chenxing LI Donglin LIU Youxi TANG | 2018 | Science China(Information Sciences)2018，61，10： | 1 |
| 7 | Aging Resistance Evaluation of Aged Paper Reinforced with Different Nanocelluloses显示文摘Paper documents experience severe acidification and embrittlement.Nanocellulose is an excellent reinforcement material for paper documents owing to its compatibility and excellent mechanical strength.However,little research has been conducted on the aging resistance of nanocellulose-reinforced paper.In this study,six types of nanocelluloses were used to reinforce aged paper.The reinforcement and anti-aging performances were evaluated,and the anti-aging mechanism was further clarified.Nanocellulose with a high degree of polymerization can better enhance aged paper,and non-chemical nanocellulose also shows better anti-aging performance,such as nanocellulose prepared by mechanical or biological methods.However,nanocellulose prepared using chemical methods exhibits poor reinforcement and anti-aging performance.This is because it has a small particle size that is not beneficial for physical crosslinking with paper fibers.More importantly,the introduction of acidic or oxidizing groups on nanocellulose accelerates the acid hydrolysis and oxidation rate of paper fibers,especially nanocellulose prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl oxidation,which should not be used to protect paper documents. | Xian Cao Bei He Jianlin Wang Chunhui Zhang Donglin Tang Qingyou Liang Chuanfu Liu Huiming Fan Junli Ren | 2023 | Paper And Biomaterials2023，8，3： | 0 |
| 8 | Analysis on background magnetic field to generate eddy current by pulsed gradient of permanent-magnet MRI显示文摘In this paper the analytical expressions for the magnetic field H and induction B in iron-pole plates generated by MRI gradient coil are given using line-current and the multilayer dielectric plate model with the mirror-image method.Eddy current emanates from the magnetic flux in the iron-pole plates.In order to fully suppress the eddy current,this magnetic flux should be fully eliminated.The research results indicate the magnetic permeability of the resist-eddy plate must be bigger than that of magnetic pole material,i.e.pure iron,and that the resist-eddy plate should be thick enough to be far away from its magnetic saturation. | ZU DongLin,HONG LiMing,CAO XueMing & TANG Xin Institute of Heavy Ion Physics,Beijing City Key Laboratory of Medical Physics and Engineering,School of Physics,Peking University,Beijing 100871,China | 2010 | Science China(Technological Sciences)2010，53，4： | 0 |
| 9 | Polyisocyanuratoesters:Renewable Linear Polyesters with High Flame Retardancy显示文摘Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential,which benefits from the development of biobased ammonia and ecological sanitation system.Urea is an ideal feedstock for chemical industry and developing new urea-based polymer materials can take advantage of the urea resource.In this work,a class of renewable linear polyesters,namely polyisocyanuratoesters(PICEs)were synthesized from a urea-based monomer bis(2-carbomethoxyethyl)isocyanurate and biobased aliphatic diols.Compared with conventional aliphatic polyesters,PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4(the number‘4’refers to the number of methylene in diols,e.g.4 for butylene and 6 for hexylene)and PICE-6 have high limiting oxygen index values over 30%.In the UL 94 tests,PICE-6 reaches V-1 rating;while V-2 is found for PICE-10.All PICEs exhibit similar pyrolysis behavior that the temperatures of 5%weight loss are around 320°C.PICEs are found to have glass transition among 20°C-45°C.No crystallization behavior is observed without annealing except for PICE-10,which can crystallize even at room temperature. | Zijian Chen Rui Hou Jianbing Cheng Fengjie Fang Donglin Tang Guangzhao Zhang | 2018 | Journal of Renewable Materials2018，6，6： | 0 |
| 10 | Synthesis and Properties of Thermoplastic Polyisocyanurates:Polyisocyanuratoamide,Polyisocyanurato(Ester-Amide)and Polyisocyanurato(Urea-Ester)显示文摘It has been proved that introducing isocyanurate into polymer chains could improve the flame retardancy of polymers.We describe in this work the synthesis and the thermal property study of three thermoplastic polyisocyanurates,which are polyisocyanuratoamide(PICA-6),polyisocyanurato(ester amide)(PICEA-6)and polyisocyanurato(urea ester)(PICUE-6).These polymers show similar and improved thermal stability with the existence of isocyanurate rings.PICA-6 is more crystalizable than the rest two and the melting temperature is found to be around 240℃ but it still crystalizes slowly.For PICEA-6 and PICUE-6,only glass transition can be observed on the DSC traces.The glass transition temperature follows the order of PICA-6>PICEA-6>PICUE-6(101.9,77.9 and 28.7℃,respectively). | Rui Hou Zhihuang Zhang Guangzhao Zhang Donglin Tang | 2020 | Journal of Renewable Materials2020，8，4： | 0 |
| 11 | A SQP optimization method for shimming a permanent MRI magnet显示文摘Based on the sequential quadratic programming(SQP) method,a new approach is presented in this paper to gain a uniform magnetic field for a permanent MRI magnet with biplanar poles.First,the adopted shimming piece is modeled as a magnetic dipole moment to calculate its effect on the background field over the imaging region of interest.Then,the SQP method is utilized to determine the ideal solution for the shimming equation.Finally,the ideal solution is discrete,and the quantization error control technique is used for special cases.This new method helps to reduce the inhomogeneity from 1234.5 ppm to 21.4 ppm over a 36 cm diameter spherical volume(DSV),within hours in practical shimming work. | Zhe Jin Xing Tang Bin Meng Donglin Zu Weimin Wang | 2009 | Progress in Natural Science:Materials International2009，19，10： | 0 |
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