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| 1 | Genetic diversity of rice cultivars (Oryza sativa L.) in China and the temporal trends in recent fifty years显示文摘To understand geographical distribution of the genetic diversity of rice cultivars {Oryza sativa L.) and its trends in recent fifty years in China, 453 ’ accessions were analyzed by 36 microsatellites loci and 42 phenotypic traits. Results revealed that the genetic diversity by SSRs is highly consistent with that by phenotypic traits and the genetic diversity of indica cultivars was higher than that of japonica cultivars; the genetic diversity of cultivars declined from 1950s to 1980s and then increased greatly; among the six rice ecological zones (REZs), genetic diversity of REZTl was the highest and those of REZV and REZVT were the lowest at both DNA and phenotypic level. Jiangsu and Jiangxi provinces in the middle and lower reaches of Yangtze River and Sichuan province in southwest of China were the areas with the highest genetic diversity. Breeders in REZV which is an important japonica rice area but with very low genetic diversity should explore more gene resources to widen the genetic backgrounds of cultivars. | QI Yonawen ZHANG Dongling ZHANG Hongliang WANG Meixing SUN Junli WEI Xinghua QIU Zongen TANG Shengxiang CAO Yongsheng WANG Xiangkun LI Zichao | 2006 | Chinese Science Bulletin2006，51，6： | 27 |
| 2 | Deep carbon cycles constrained by a large-scale mantle Mg isotope anomaly in eastern China显示文摘Although deep carbon recycling plays an important role in the atmospheric CO_2 budget and climate changes through geological time,the precise mechanisms remain poorly understood.Since recycled sedimentary carbonate through plate subduction is the main light-δ^(26)Mg reservoir within deep-Earth,Mg isotope variation in mantle-derived melts provides a novel perspective when investigating deep carbon cycling.Here,we show that the Late Cretaceous and Cenozoic continental basalts from 13 regions covering the whole of eastern China have low δ^(26)Mg isotopic compositions,while the Early Cretaceous basalts from the same area and the island arc basalts from circum-Paciic subduction zones have mantle-like or heavy Mg isotopic characteristics.hus,a large-scale mantle low δ^(26)Mg anomaly in eastern China has been delineated,suggesting the contribution of sedimentary carbonates recycled into the upper mantle,but limited into the lower mantle.his large-scale spatial and temporal variation of Mg isotopes in the mantle places severe constraints on deep carbon recycling via oceanic subduction. | Shu-Guang Li Wei Yang Shah Ke Xunan Meng Hengci Tian Lijuan Xu Yongsheng He Jian Huang Xuan-Ce Wang Qunke Xia Weidong Sun Xiaoyong Yang Zhong-Yuan Ren Haiquan Wei Yongsheng Liu Fancong Meng Jun Yan | 2017 | National Science Review2017，4，1： | 23 |
| 3 | Accuracy of LA-ICPMS zircon U-Pb age determination:An inter-laboratory comparison显示文摘LA-ICPMS zircon U-Pb dating has been greatly advanced and widely applied in the past decade because it is a cheap and fast technique.The internal error of LA-ICPMS zircon U-Pb dating can be better than 1%,but reproducibility(accuracy)is relatively poor.In order to quantitatively assess the accuracy of this technique,zircons from two dioritic rocks,a Mesozoic dioritic microgranular enclave(FS06)and a Neoproterozoic diorite(WC09-32),were dated independently in eight laboratories using SIMS and LA-ICPMS.Results of three SIMS analyses on FS06 and WC09-2 are indistinguishable within error and give a best estimate of the crystallization age of 132.2 and 760.5 Ma(reproducibility is^1%,2RSD),respectively.Zircon U-Pb ages determined by LA-ICPMS in six laboratories vary from 128.3±1.0 to 135.0±0.9 Ma(2SE)for FS06 and from 742.9±3.1 to777.8±4.7 Ma(2SE)for WC09-32,suggesting a reproducibility of^4%(2RSD).Uncertainty produced during LA-ICPMS zircon U-Pb analyses comes from multiple sources,including uncertainty in the isotopic ratio measurements,uncertainty in the fractionation factor calculation using an external standard,uncertainty in the age determination as a result of common lead correction,age uncertainty of the external standards and uncertainty in the data reduction.Result of our study suggests that the uncertainty of LA-ICPMS zircon U-Pb dating is approximately 4%(2RSD).The uncertainty in age determination must be considered in order to interpret LA-ICPMS zircon U-Pb data rationally. | LI XianHua LIU XiaoMing LIU YongSheng SU Li SUN WeiDong HUANG HuiQing YI Keewook | 2015 | Science China Earth Sciences2015，58，10： | 15 |
| 4 | Mechanism for suspension magnetization roasting of iron ore using straw-type biomass reductant显示文摘As an alternative reductant for fossil fuel in the future,straw-type biomass contributes to emission reduction and green utilization in the suspension roasting process.In this study,the influences of the roasting time,roasting temperature and dose of straw-type biomass after suspension magnetization roasting(SMR) and separation were investigated.The optimal conditions were determined to be a roasting time of 7.5 min with a straw-type biomass dose of 20 wt% and a roasting temperature of 800℃ in which an iron grade of 71.07% and recovery of 94.17% were obtained for the iron concentrate.The maximum saturation magnetization under optimal conditions was 35.05 A·m^(2)·g^(-1),and the gaseous regulation of the biomass revealed that cumulative reducing gas volume was 293.93 mL at the optimal roasting time of450 s.The transformation of hematite to magnetite was detected by X-ray diffraction(XRD).During microstructure evolution,the outer layer consisting of fissures and tiny holes continuously deepened toward the core. | Yue Cao Yongsheng Sun Peng Gao Yuexin Han Yanjun Li | 2021 | International Journal of Mining Science and Technology2021，31，6： | 8 |
| 5 | Effect of Irrigation with Saline Water on Soil Water-Salt Dynamics and Maize yield in Arid Northwest China显示文摘An experiment was conducted in non-weighing lysimeters to study the effect of irrigation with saline water on water movement and salt accumulation and maize yield. The experiment was carried out in northwest China,both sufficient and insufficient irrigation were applied in the first year,and only sufficient treatments in the second year. Irrigation with solute concentration of 9 g·L-1 and 6 g·L-1 led to salt accumulation about 6-8 dS·m-1 in certain depths,even downwards to 160 cm received about 4 dS·m-1 for 9 g·L-1 and 2 dS·m-1 for 6 g·L-1,which was two times more than initial. Salt-affected water extracted from soil behaved as low evapotranspiration under sufficient irrigation,and more water was left in the soil. Yield of spring maize was not affected when saturated soil paste electrical conductivity did not exceeded 1.2 dS·m-1. | JIANG Jing FENG Shaoyuan HUO Zailin WANG Yongsheng SUN Zhenhua | 2010 | Wuhan University Journal of Natural Sciences2010，15，1： | 5 |
| 6 | Genetic structure and diversity of Oryza sativa L. in Guizhou,China显示文摘Preserving many kinds of rice resources and rich variations, Guizhou Province is one of the districts with the highest genetic diversity of cultivated rice (Oryza sativa L.) in China. In the current research, genetic diversity and structure of 537 accessions of cultivated rice from Guizhou were studied using 36 microsatellite markers and 39 phenotypic characters. The results showed that the model-based genetic structure was the same as genetic-distance-based one using SSRs but somewhat different from the documented classification (mainly based on phenotype) of two subspecies. The accessions being classified into indica by phenotype but japonica by genetic structure were much more than that being classified into japonica by phenotype but indica by genetic structure. Like Ding Ying’s taxonomic sys- tem of cultivated rice, the subspecific differentiation was the most distinct differentiation within culti- vated rice. But the differentiation within indica or japonica population was different: japonica presented clearer differentiation between soil-watery ecotypes than indica, and indica presented clearer differen- tiation between seasonal ecotypes than japonica. Cultivated rices in Guizhou revealed high genetic diversity at both DNA and phenotypic levels. Possessing the highest genetic diversity and all the nec- essary conditions as a center of genetic diversity, region Southwestern of Guizhou was suggested as the center of genetic diversity of O. sativa L. from Guizhou. | ZHANG DongLing ZHANG HongLiang WEI XingHua QI YongWen WANG Meixing SUN JunLi DING Li TANG ShengXiang QIU Zong'En CAO YongSheng WANG XiangKun LI ZiChao | 2007 | Chinese Science Bulletin2007，52，3： | 5 |
| 7 | The Seismogenic Structure of the 2010 Suining Ms 5.0 Earthquake and its Geometry,Kinematics and Dynamics Analysis显示文摘在 2010 年 1 月, Suining Ms5.0 地震发生在中央四川盆,与在 Moxi-Longnvsi 结构的带和 10 km 的焦点的深度的震中。在这个区域基于地震侧面的结构的解释,我们认出了在 910 km 的深度位于 Suining 区域的 Presinian 地下室的一个地区性的分开差错,转移它从 NW 滑倒到 SE 取向。从 NW 滑动到 SE,并且经历了几的这个分开差错砍并且弯曲,它引起了地下室被卷在并且覆盖阶层褶层变丑。它在 Moxi 区域形成了差错拐弯褶层与一近似 4 km 滑倒。相应地, Moxi 背斜的形成与分开差错有关。与地震分开差错的斜面上的震中,有一个新观点, Suining 地震被这个地下室分开差错的复活引起。自从迟了的侏罗记时期,在地区性的构造应力的影响下面,分开差错从 Longmen 山( LMS )戳带把它的slip 转移了到四川盆的内地,并且最后到西南 Huayingshan ( HYS )的山麓地区,它显示 HYS 可能是 LMS 戳带的最后的前面区域。 | LU Renqi HE Dengfa JOHN Suppe MA Yongsheng GUAN Shuwei SUN Yanpeng GAO Jinwei | 2011 | Acta Geologica Sinica(English Edition)2011，85，6： | 5 |
| 8 | The ultraviolet photoconductive detector based on Al-doped ZnO thin film with fast response显示文摘We report fabrication and characterization of metal-semiconductor-metal photoconductive detectors based on Al-doped ZnO thin films fabricated by radio frequency magnetron sputtering.Optical and structural properties of the thin films were characterized using various techniques.At 6 V bias,a responsivity higher than 4 A/W in the wavelength shorter than 350 nm was obtained,and this responsibility dropped quickly and reached the noise floor in the visible region.Transient response measurement revealed that the detector had a fast photoresponse with a rise time of 9 ns and a fall time of 1.2 μs. | SUN Jian DAI Qian LIU FengJuan HUANG HaiQin LI ZhenJun ZHANG XiQing WANG YongSheng | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，1： | 4 |
| 9 | Balancing flexural strength and porosity in DLP-3D printing Al_(2)O_(3)cores for hollow turbine blades显示文摘High porosity and high strength are usually mutually exclusive in the preparation of ceramic materials.However,high porosity and flexural strength are required for the preparation of complex ceramic cores for hollow turbine blades.In this study,Al_(2)O_(3)cores with high porosity and high flexural strength were successfully prepared using digital light processing(DLP)3 D printing technology.The influence of sintering temperature on the microstructure,pore evolution,and flexural strength of the cores were investigated.With an increase in the sintering temperature,the porosity of the ceramic cores first increased and then decreased,reaching a maximum value of 35%at 1400℃.The flexural strength increased with the increase in sintering temperature,but at 1400℃the incremental enhancement of flexural strength was greatest.Combined with the core service requirements and core performance,this study selected 1400℃(open porosity of 35.1%and flexural strength of 20.3 MPa)as the optimal sintering temperature for the DLP-3 D printed Al_(2)O_(3)core. | Qiaolei Li Xiaolong An Jingjing Liang Yongsheng Liu Kehui Hu Zhigang Lu Xinyan Yue Jinguo Li Yizhou Zhou Xiaofeng Sun | 2022 | Journal of Materials Science & Technology2022，，9： | 4 |
| 10 | Targeting the PI3K/Akt/mTOR signaling pathway by pterostilbene attenuates mantle cell lymphoma progression显示文摘 | Dandan Yu Yong Zhang Gege Chen Yongsheng Xie Zhijian Xu Shuaikang Chang Liangning Hu Bo Li Wenxuan Bu Yingcong Wang Wenqin Xiao Xi Sun Gaomei Chang Lu Gao Sujing Qiang Xiaosong Wu Weiliang Zhu Jumei Shi | 2018 | Acta Biochimica et Biophysica Sinica2018，50，8： | 4 |
| 11 | Organic photodetectors based on transparent electrodes for application in ultraviolet light detection显示文摘A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated.A transparent conducting polymer PEDOT:PSS coated quartz substrate instead of ITO coated glass substrate as anode is propitious to detect shorter wavelength ultraviolet light.As a result,the device shows a low dark current density,a high responsivity of 502 mA/W and a detectivity of 2.67×10 12 cm Hz 1/2 /W which is illuminated by a 220 nm ultraviolet light with an intensity of 1.6 mW/cm 2.Moreover,the performance of the PEDOT:PSS transparent electrode device is better than the semi-transparent Al electrode device electrode because of the higher transmittance and electrode properties. | DAI Qian ZHU Lu SUN Jian ZHANG XiQing WANG YongSheng | 2012 | Science China(Technological Sciences)2012，55，6： | 4 |
| 12 | Epitaxial growth and oxidation behavior of an overlay coating on a Ni-base single-crystal superalloy by laser cladding显示文摘An overlay coating material was deposited on a single crystal superalloy SRR99 by laser cladding.The microstructure and oxidation behavior of this coating was investigated through scanning electron microscopy(SEM) and X-ray diffraction(XRD). The results indicated that although the composition of the coating was chosen based on the γ' composition in René N5 superalloy, the primary solidification phase of this coating during laser cladding was γ-Ni. Furthermore, under the laser cladding condition, fine parallel dendrites grew epitaxially in the coating from the substrate, indicating the single crystal structure of the substrate was reproduced. When the single crystal MCrAlY coating was oxidized at 1000?, both Al_2O_3 and Al_2O_3 formed during initial oxidation process. As the oxidation time proceeded, the presence of Al_2O_3 facilitated the formation of NiAl_2O_4 spinel oxide. Once the spinel was observed, it flourished and induced some porosity in the scale. When the scale thickness increased to 6–7 μm, large area spallation of the scale began. | Jingjing Liang Yongsheng Liu Jinguo Li Yizhou Zhou Xiaofeng Sun | 2019 | Journal of Materials Science & Technology2019，35，2： | 3 |
| 13 | Observation and research of deep underground multi-physical fields—Huainan–848 m deep experiment显示文摘Compared with the surface,the deep environment has the advantages of allowing“super-quiet and ultra-clean”-geophysical field observation with low vibration noise and little electromagnetic interference,which are conducive to the realization of long-term and high-precision observation of multi-physical fields,thus enabling the solution of a series of geoscience problems.In the Panyidong Coal Mine,where there are extensive underground tunnels at the depth of 848 m below sea level,we carried out the first deep-underground geophysical observations,including radioactivity,gravity,magnetic,magnetotelluric,background vibration and six-component seismic observations.We concluded from these measurements that(1)the background of deep subsurface gravity noise in the long-period frequency band less than 2 Hz is nearly two orders of magnitude weaker than that in the surface observation environment;(2)the underground electric field is obviously weaker than the surface electric field,and the relatively high frequency of the underground field,greater than 1 Hz,is more than two orders of magnitude weaker than that of the surface electric field;the east-west magnetic field underground is approximately the same as that at the surface;the relatively high-frequency north-south magnetic field underground,below 10 Hz,is at least one order of magnitude lower than that at the surface,showing that the underground has a clean electromagnetic environment;(3)in addition to the highfrequency and single-frequency noises introduced by underground human activities,the deep underground space has a significantly lower background vibration noise than the surface,which is very beneficial to the detection of weak earthquake and gravity signals;and(4)the underground roadway support system built with ferromagnetic material interferes the geomagnetic field.We also found that for deep observation in the“ultra-quiet and ultra-clean”environment,the existing geophysical equipment and observation technology have problems of poor adaptability and insufficient precision as well as data cleaning problems,such as the effective separation of the signal and noise of deep observation data.It is also urgent to interpret and comprehensively utilize these high-precision multi-physics observation data. | Yun WANG Yaxin YANG Heping SUN Chengliang XIE Qisheng ZHANG Xiaoming CUI Chang CHEN Yongsheng HE Qiangqiang MIAO Chaomin MU Lianghui GUO Jiwen TENG | 2023 | Science China Earth Sciences2023，66，1： | 3 |
| 14 | Azvudine is a thymus-homing anti-SARS-CoV-2 drug effective in treating COVID-19 patients显示文摘Azvudine(FNC)is a nucleoside analog that inhibits HIV-1 RNA-dependent RNA polymerase(RdRp).Recently,we discovered FNC an agent against SARS-CoV-2,and have taken it into Phase III trial for COVID-19 patients.FNC monophosphate analog inhibited SARS-CoV-2 and HCoV-OC43 coronavirus with an EC_(50) between 1.2 and 4.3 μM,depending on viruses or cells,and selective index(SI)in 15-83 range.Oral administration of FNC in rats revealed a substantial thymus-homing feature,with FNC triphosphate(the active form)concentrated in the thymus and peripheral blood mononuclear cells(PBMC).Treating SARS-CoV-2 infected rhesus macaques with FNC(0.07 mg/kg, qd,orally)reduced viral load,recuperated the thymus,improved lymphocyte profiles,alleviated in flammation and orga n damage,and lessened grou nd・glass opacities in chest X-ray.Sin gle-cell seque ncing suggested the promotion of thymus function by FNC.A randomized,single-arm clinical trial of FNC on compassionate use(n=31)showed that oral FNC(5 mg,qd)cured all COVID-19 patients,with 100%viral ribonucleic acid negative conversion in 3.29±2.22 days(range:1-9 days)and 100%hospital discharge rate in 9.00±4.93 days(range:2-25 days).The side-effect of FNC is minor and transient dizziness and nausea in 16.12%(5/31)patients.Thus,FNC might cure COVID-19 through its anti-SARS-CoV-2 activity concentrated in the thymus,followed by promoted immunity. | Jin-Lan Zhang Yu-Huan Li Lu-Lu Wang Hong-Qi Liu Shuai-Yao Lu Yong Liu Ke Li Bin Liu Su-Yun Li Feng-Min Shao Kun Wang Ning Sheng Rui Li Jin-Jin Cui Pei-Chun Sun Chun-Xia Ma Bo Zhu Zhe Wang Yuan-Hao Wan Shi-Shan Yu Yongsheng Che Chao-Yang Wang Chen Wang Qiangqian Zhang Li-Min Zhao Xiao-Zhong Peng Zhenshun Cheng Jun-Biao Chang Jian-Dong Jiang | 2022 | Signal Transduction and Targeted Therapy2022，7，1： | 3 |
| 15 | The Clinical Study of Healon 5 in Phacoemulsification and IOL Implantation显示文摘Purpose: To compare a new ophthalmic viscoelastic device (OVD) Healon 5 with twoother kinds of OVDs commonly used in China during phacoemulsification and intraocularlens (IOL) implantation in terms of removal time, intraocular pressure, corneal andanterior chamber response.Methods: This prospective randomized study, in which patients and observers aremasked, comprises niety eyes. They were randomly divided into 3 groups with differentOVDs. Healon 5 (sodium hyaluronate 5 000 2.3 % ) was compared with Healon GV(sodium hyaluronate 7 000 1.4 % ) and Iviz (sodium hyaluronate 1.0 % ) . Thesurgeries were performed with temporal corneal incision, phacoemulsification in situ andfoldable lens intracapsular implantation. The characteristic and the removal time of theviscoelastic material as well as the postoperative IOP, corneal reaction and anteriorchamber reactions of the eyes were observed preoperatively and 24 hrs postoperatively.Exclusion criteria were glaucoma, a preoperative dilated pupil diameter smaller than 5.0mm, proliferative diabetic retinopathy, significant corneal pathology or a history ofuveitis.Results: The removal time was 47.42 ± 13.09 seconds in Healon 5, 16. 50 ± 5.45 inHealon GV and 15.83±7.40 in Iviz. The removal time of Healon 5 group wassignificantly longer than that of the other groups ( P =0. 000) . There is no significantIOP change 24 hours postoperatively and the difference of intraocular pressure amongthree groups was not significant ( P > 0.05). Healon 5 group had the slightest cornealand anterior chamber response, followed by Healon GV and Iviz.Conclusion: Although takes longer time to remove, Healon 5 is an ideal viscoelasticmaterial for its superior space maintenance capacity and high dispersity which providessuperior protection of endothelial cells compared to Healon GV and Iviz. | Hui Yang, Danying Zheng, Jingjing Huang, Yongsheng Huang, Zhenping ZhangZhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou 510060, China | 2001 | 眼科学报2001，17，3： | 2 |
| 16 | SOME REMARKS ON THE OPTIMAL SUBSPACES OF A CONVOLUTION CLASS WITH A NCVD KERNEL显示文摘In this note a new generalized version of the classical Landau-Kolmogorov and Stein inequalities is estab- lished on a convolution class of periodic functions with a NCVD kernel. On this basis some sets of optimal sub- spaces for the Zn-dunebsuibal Kolmogorov width of such function class are identified. | Sun YongSheng (Beijing Normal Unitversity,China) | 1999 | Analysis in Theory and Applications1999，15，4： | 2 |
| 17 | The distribution and sources of polycyclic aromatic hydrocarbons in shallow groundwater from an alluvial-diluvial fan of the Hutuo River in North China显示文摘This paper has investigated the concentration and distribution of polycyclic aromatic hydrocarbons in shallow groundwater from an alluvial-diluvial fan of the Hutuo River in North concentration levels of China.Results show that the 16 priority polycyclic aromatic hydrocarbons range from 0 to 92.06 ng/L,do not conform to drinking water quality standards in China (GB 5749-2006).However,the concentration figures of priority polycyclic aromatic hydrocarbons are much lower than that of other studies conducted elsewhere in China.In addition,highly-concentrated polycyclic aromatic hydrocarbons (50-92 ng/L)are fragmentarily distributed.The composition of polycyelic aromatic hydrocarbons from this study indicates that low molecular polycyclic aromatic hydrocarbons are predominant in groundwater samples, medium molecular compounds occur at low concentrations,and high molecular hydrocarbons are not detected. The polycyclic aromatic hydrocarbon composition in groundwater samples is basically the same as that of gaseous samples in the atmosphere in this study.Therefore, the atmospheric input is assumed to be an important source of polycyclic aromatic hydrocarbons,no less than wastewater discharge,adhesion on suspended solids,and surface water leakage.Ratios of specific polycyclic aromatic hydrocarbons demonstrate that they mainly originate from wood or coal combustion as well as natural gas and partially from petroleum according to the result of principal component analysis.On the whole,conclusions are drawn that the contamination sources of these polycyclic aromatic hydrocarbons are likely petrogenic and pyrolytic inputs.Future investigations by sampling topsoil,vadose soil,and the atmosphere can further verify aforementioned conclusions. | Jincui WANG Yongsheng ZHAO Jichao SUN Ying ZHANG Chunyan LIU | 2019 | Frontiers of Earth Science2019，13，1： | 2 |
| 18 | Fe atoms anchored on defective nitrogen doped hollow carbon spheres as efficient electrocatalysts for oxygen reduction reaction显示文摘Defective electrocatalysts,especially for intrinsic defective carbon,have aroused a wide concern owing to high spin and charge densities.However,the designated nitrogen species favorable for creating defects by the removal of nitrogen,and the influence of defects for the coordination structure of active site and oxygen reduction reaction(ORR)activity have not been elucidated.Herein,we designed and synthesized a pair of electrocatalysts,denoted as Fe-N/C and Fe-ND/C for coordination sites of atomic iron-nitrogen and iron-nitrogen/defect configuration embedded in hollow carbon spheres,respectively,through direct pyrolysis of their corresponding hollow carbon spheres adsorbed with Fe(acac)3.The nitrogen defects were fabricated via the evaporation of pyrrolic-N on nitrogen doped hollow carbon spheres.Results of comparative experiments between Fe-N/C and Fe-ND/C reveal that Fe-ND/C shows superior ORR activity with an onset potential of 30 mV higher than that of Fe-N/C.Fe-ND sites are more favorable for the enhancement of ORR activity.Density functional theory(DFT)calculation demonstrates that Fe-ND/C with proposed coordination structure of FeN_(4-x)(0 | Panpan Su Wenjuan Huang Jiangwei Zhang Utsab Guharoy Qinggang Du Qiao Sun Qike Jiang Yi Cheng Jie Yang Xiaoli Zhang Yongsheng Liu San Ping Jiang Jian Liu | 2021 | Nano Research2021，14，4： | 2 |
| 19 | Anisotropic lattice Boltzmann-phase-field modeling of crystal growth with melt convection induced by solid-liquid density change显示文摘Density change is ubiquitous in phase transformation, and it can induce melt convection which strongly influences the crystal growth. Here, an anisotropic lattice Boltzmann-phase-field method was extended to predict the dendritic growth under the shrinkage or expansion melt convection by density change induced. A novel LB equation with an anisotropic coefficient was constructed to model the advancement of ordering parameter, coupling with the passive scalar LB equation for convective and diffusive heat transfer during phase transition. We studied dendritic growth and shape selection with melt convection induced by density change in crystal growth. Results show that the melt convection induced by density change affects strongly the dendritic growth. The shrinkage flow results in a higher tip velocity while the expansion flow leads to a slower one. Predicted Péclet number with respect to the relative density change was compared with an analytical solution. Moreover, the modified selection parameter has been verified by numerical simulations. | Hui Xing Xianglei Dong Dongke Sun Yongsheng Han | 2020 | Journal of Materials Science & Technology2020，54，22： | 2 |
| 20 | Control system for cryogenic permanent magnet undulator(CPMU)of high energy photon source(HEPS)显示文摘Background High energy photon source(HEPS)is the fourth-generation light source,which uses a large number of highperformance insertion devices to generate synchrotron radiation.The control system is an important part of the insertion device(ID).Purpose Cryogenic permanent magnet undulator(CPMU)is one kind of IDs that works in liquid nitrogen temperature and ultra-high vacuum environment,and its control system is more difficult and complex than in-air ID.The design of the control system for CPMU will be introduced in detail.Method The sub-systems include high-precision magnetic gap control,safety protection,measurement and compensation of magnetic gap at cryogenic temperature and cryogenic temperature monitoring.Mature,reliable,stable technical schemes are designed to meet the technical specifications of sub-systems.Results The experiment results show that the magnetic gap motion accuracy can be controlled within 0.2–0.3μm under the step size of 1μm.The safety protection system has been tested in turn,and the predetermined protection can be achieved.The average value of magnetic gap cold contraction is 1.512 mm measured by optical micrometer,and the compensation is realized by software.The average temperature of the main magnet structure measured by the temperature sensors is 81.0 K,and the temperature gradient is 0.7 K/m.The temperature monitoring is reliable and stable.Conclusion The CPMU control system which is based on EPICS has been successfully applied to the CPMU prototype,and the test results have met the design specifications. | Shutao Zhao Jianshe Cao Huihua Lu Xiaoyu Li Shuchen Sun Yajun Sun Xiangzhen Zhang Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Qing Guo Keyun Gong Yongsheng Huang Yanwei Yang Yufeng Yang | 2021 | Radiation Detection Technology and Methods2021，5，1： | 2 |
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