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Effect of Ti-Hf-Zr-Cu-Ni high entropy alloy addition on laser beam welded joint of Ti2AlNb based intermetallic alloy

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Journal of Materials Science & Technology 2022年第25期120卷 214-226页

作者： Mirza Zahid Hussain Jiangtao Xiong Jinglong Li Farah Siddique Lin Jie Zhang Yajie Du xian rong Zhou State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710072China

TiAlNb based intermetallic alloys,a potential competitor for next-generation super alloys,are susceptible to high-temperature embrittlement due to nucleation of a metastable single B2 phase in the fusion zone(FZ)during laser beam welding(LBW).In this study,a high entropy alloy(HEA),Ti-Hf-Zr-Cu-Ni,was self-developed and introduced as an interlayer into laser beam welded joint(LBWJ)of Ti-22 Al-27 Nb to analyze its impact on the evolution of microstructure in the weld zone(WZ)and subsequently on joint *** examination was carried out through electron probe micro analysis(EPMA),electron backscattered diffraction(EBSD)analysis,high-resolution scanning transmission electron microscopy(HRSTEM)comprising bright field(BF),selective area electron diffraction(SAED)and high angle annular dark-field(HAADF)*** of the HEA into FZ of LBWJ triggered heterogenous nucleation during solidification,resultantly,fine-grained B2 with a greater proportion of high angle grain boundaries(HAGBs)was *** of Ti-22 Al-27 Nb LBWJ,prepared with an interlayer of HEA,was composed of planar,cellular,columnar and equiaxed dendritic grains;a solidification mode which was different from that observed in LBWJ prepared without adulteration of the *** impact of heterogenous nucleation during epitaxial solidification on mechanical properties was established through micro vickers hardness mapping and tensile test,conducted at room *** average hardness,343.5 HV,in the FZ of LBWJ prepared with an interlayer of HEA,was compatible with that of base material(BM),345 *** ultimate tensile strength(UTS),1062 MPa,and percentage elongation,11.2%,of the HEA tempered LBWJ were found in close approximation with that of BM,1060 MPa and 13.4%,respectively.A ductile mode of failure was observed during tensile test of the Ti-Hf-Zr-Cu-Ni supplemented LBWJ of Ti-22 Al-27 Nb,while quasi-cleavage mode of fracture was apparent in the joint of Ti-22 Al-27 Nb welded with

关键词： Laser beam welding Ti2Al Nb based intermetallics High entropy alloy Heterogenous nucleation

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Synthesis and characterization of a novel main chain oxadiazole-based copolymer for n-type solar cell material

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Chinese Chemical Letters 2007年第11期18卷 1342-1346页

作者： xian rong Cai Hao Chen Tao Zhang Xing Xu Ying Li Qing Jiang College of Chemistry Sichuan University Chengdu 610064 China

A novel oxadiazole-based copolymer has been successfully synthesized through the palladium-catalyzed cross-coupling polycondensation method. The copolymer P is soluble in common organic solvents. Its structure has characterized by ^1H NMR, ^13C NMR, gel permeation chromatagraphy （GPC）, UV-vis absorbance （Abs） and photoluniminescence （PL） spectroscopy, and cyclic voltammetry （CV）. Investigation of its optical properties revealed that it is yellow emitting material, and the electrochemical analysis showed that P was well suited poly （2,5-dioctyloxy-p-phenylenevinylene）（PDOCPV） for photovoltaic devices, so the copolymer P is able to act as an electron acceptor in combination with PDOCPVas the electron donor to quench photoluminescence of the copolymer in the blend, indicative of the efficient photoinduced electron transfer from the PDOCPV to the P.

关键词： Copolymer Oxadiazole Photoluminescence quenching

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Interfacial properties and micellization of triblock poly(ethylene glycol)-poly(ε-caprolactone)-polyethyleneimine copolymers

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Acta Pharmaceutica Sinica B 2020年第6期10卷 1122-1133页

作者： Ji Li Yitian Du Haitao Su Shixuan Cheng Yanxia Zhou Yiguang Jin xian-rong Qi Key Laboratory of Molecular Pharmaceutics and New Drug Delivery System School of Pharmaceutical SciencesPeking UniversityBeijing 100191China Department of Pharmaceutical Sciences Beijing Institute of Radiation MedicineBeijing 100850China

This study aimed to explore the link between block copolymers’interfacial properties and nanoscale carrier formation and found out the influence of length ratio on these characters to optimize drug delivery system.A library of diblock copolymers of PEG-PCL and triblock copolymers with additional PEI(PEG-PCL-PEI)were ***,a systematic isothermal investigation was performed to explore molecular arrangements of copolymers at air/water ***,structural properties and drug encapsulation in self-assembly were investigated with DLS,SLS and *** found the additional hydrogen bond in the PEG-PCL-PEI contributes to film stability upon the hydrophobic interaction compared with ***-PCL-PEI assemble into smaller micelle-like(such as PEGPCL4006-PEI)or particle-like structure(such as PEG-PCL8636-PEI)determined by their hydrophilic and hydrophobic block *** distinct structural architectures of copolymer are consistent between interface and *** the disparity of constituent ratio,we discovered the arrangement of both chains guarantees balanced hydrophilic-hydrophobic ratio in self-assembly to form stable ***,the structural differences were found to have significant influence on model drugs incorporation including docetaxel and *** together,these findings indicate the correlation between molecular arrangement and self-assembly and inspire us to tune block compositions to achieve desired nanostructure and drug loading.

关键词： Block copolymers Langmuir films Molecular arrangement Self-assembly Nanostructure

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Impurity effects of the ■ hyperon in the hypernuclear systems ■Mg and ■Si

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Communications in Theoretical Physics 2021年第11期73卷 118-123页

作者： Ji-Wei Cui xian-rong Zhou School of Physics and Optoelectronic Engineering Xidian University Department of Physics East China Normal University

Based on the beyond-mean-field Skyrme-Hartree-Fock model, impurity effects of the Λhyperon in the hypernuclear systems ■Mg and ■Si are investigated, respectively. Four cases, in which the Λhyperon occupies the single-particle orbitals L[000]1+/2, L[110]1-/2, L[101]3-/2 and L[101]1-/2,are focused. In each case, the potential energy surface and the energy curves projected on certain angular momenta are employed to show the influence of the Λhyperon on the nuclear core. Beside the shrinkage effect that is induced by the Λhyperon occupying the sΛorbital, it is found that theΛhyperon on the pΛorbital, L[110]1-/2, drives the nuclear core toward a prolate shape, while the ones on the other two pΛorbitals, L[101]3-/2 and L[101]1-/2, drive the nuclear core toward an oblate shape. The energy spectra and the corresponding intra-band E2 transition rates for the rotational bands are given as a prediction for future experiments.

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Radioprotective effects of cimetidine on rats irradiated by long-term, low-dose-rate neutrons and ^(60)Coγ-rays

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Military Medical Research 2017年第3期4卷 141-148页

作者： Ding-Wen Jiang Qing-rong Wang xian-rong Shen Ying He Tian-Tian Qian Qiong Liu Deng-Yong Hou Yu-Ming Liu Wei Chen Xin Ren Ke-xian Li The PLA Key Laboratory of Biological Effect and Medical Protection on Naval Vessel Special Environment Naval Medical Research Institute

Background: Cimetidine, an antagonist of histamine type II receptors, has shown protective effects against γ-rays or neutrons. However, there have been no reports on the effects of cimetidine against neutrons combined with γ-rays. This study was carried out to evaluate the protective effects of cimetidine on rats exposed to long-term, low-dose-rate neutron and γ-ray combined irradiation(n-γ LDR).Methods: Fifty male Sprague-Dawley(SD) rats were randomly divided into 5 groups: the normal control group, radiation model group, 20mg/(kg·d) cimetidine group, 80mg/(kg·d) cimetidine group and 160mg/(kg·d) cimetidine group(10 rats per group). Except for the normal control group, 40 rats were simultaneously exposed to fission neutrons(^(252)Cf, 0.085 m Gy/h) for 22 h every day and γ-rays(^(60)Co, 0.097Gy/h) for 1.03 h once every three days, and the cimetidine groups were administered intragastrically with cimetidine at doses of 20, 80 and 160mg/kg each day. Peripheral blood WBC of the rats was counted the day following exposure to γ-rays. The rats were anesthetized and sacrificed on the day following exposure to ^(252)Cf for 28 days. The spleen, thymus, testicle, liver and intestinal tract indexes were evaluated. The DNA content of bone marrow cells and concanavalin A(Con A)-induced lymphocyte proliferation were measured. The frequency of micronuclei in polychromatic erythrocytes(f MNPCEs), superoxide dismutase(SOD), malondialdehyde(MDA), and glutathione peroxidase(GSH-Px) in the serum and liver tissues were ***: The peripheral blood WBC in the cimetidine groups was increased significantly on the 8th day and the 26 th day compared with those in the radiation model group. The spleen, thymus and testicle indexes of the cimetidine groups were higher than those of the radiation model group. The DNA content of bone marrow cells and lymphocyte proliferation in the cimetidine groups were increased significantly, and fMNPCE was reduced 1.41-1.77 fold in cimetidine treate

关键词： Cimetidine Radioprotection Antioxidation Immunomodulation Micronuclei

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Analyses of β-Bands of 230,232Th and 232,234U by the Projected Shell Model

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Chinese Physics Letters 2012年第2期29卷 59-62页

作者： CUI Ji-Wei ZHOU xian-rong CHEN Fang-Qi SUN Yang WU Cheng-Li Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen UniversityXiamen 361005 Department of Physics and Institute of nuclear particleastronomy and cosmologyShanghai Jiao Tong UniversityShanghai 200240

The ground bands and β-bands of four nuclei 230,232Th and 232,234U in the actinide region are investigated by introducing a collective Do pair into the projected shell *** discuss the collectivity of the Do *** calcu... 详细信息

关键词： bands collective model

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Motion constraint Markov network model for multi-target tracking

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Optoelectronics Letters 2008年第5期4卷 375-378页

作者： WU Ming-jun PENG xian-rong ZHANG Qi-heng LU Gang FAN Zhi-hua Institute of Optics and Electronics Chinese Aeademy of Sciences Chengdu 610209 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

A typical Markov network for modeling the interaction among targets can handle the error merge problem,but it suffers from the labeling problem due to the blind competition among collaborative trackers. In this paper,we propose a motion constraint Markov network model for multi-target tracking. By augmenting the typical Markov network with an ad hoc Markov chain which carries motion constraint prior,this proposed model can overcome the blind competition and direct the label to the corresponding target even in the case of severe occlusion. In addition,the motion constraint prior is formu-lated as a local potential function and can be easily incorporated in the joint distribution representation of the novel model. Experimental results demonstrate that our model is superior to other methods in solving the error merge and labeling problems simultaneously and efficiently.

关键词：网络模型多目标跟踪交互作用运动约束

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Antioxidant Effects of Oats Avenanthramides on Human Serum

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Agricultural Sciences in China 2011年第8期10卷 1301-1305页

作者： LIU Sen YANG Nan HOU Zhao-hua YAO Yang Lü Li ZHOU xian-rong REN Gui-xing Institute of Comprehensive Utilization of Agricultural Products Shanxi Academy of Agriculture SciencesTaiyuan 030031P.R.China Institute of Crop Science Chinese Academy of Agricultural SciencesBeijing 100081P.R.China The General Hospital of Chinese People＇s Armed Police Forces Beijing 100039P.R.China

The antioxidant ability of capsules containing oats avenanthramides on human body was evaluated in present *** people were randomized to supplementation with oats-derived avenanthramides capsules or placebo for 1 *** lipid peroxides and antioxidant status were *** 8 capsules （containing 3.12 mg avenanthramides） groups,the levels of serum superoxide dismutase （SOD） and reduced glutathione hormone （GSH） were significantly increased by 8.4 and 17.9%,respectively （P0.05）,and malondialdehyde （MDA） level significantly decreased by 28.1%.The total cholesterol （TC）,triglyceride （TG）,and low density lipoprotein cholesterol （LDL-C） levels were lowered by 11.1,28.1,and 15.1%,respectively （P0.05）.The high density blood lipoprotein cholesterol （HDL-C） levels in the same treat was increased by 13.2%.Based on our research,it can be concluded that oats extract containing avenanthramides possessed a high antioxidative activity on *** indicated that oat avenanthramides could be used to prevent hyperlipemic and angiocardiopathy.

关键词： oats avenanthramides human serum antioxidation SOD MDA LDL-C HDL-C

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Effects of a Λ hyperon on the negative-parity states of ^(20)Ne

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 207-207页

作者： Ji-Wei Cui xian-rong Zhou School of Physics Xidian UniversityXi’an 710071China Department of Physics East China Normal UniversityShanghai 200241China

The properties of the clusterized structure in ^(21)_(Λ)Ne are stud-ied in detail based on a beyond relativistic mean-field(RMF)model in a recent paper[1],“The interplay of single-particle and collective motions in the low-lying states of ^(21)_(Λ)Ne with quadrupole-octupole correlations”.The intrinsic mean-field states of ^(21)_(Λ)Ne with quadrupole and octupole constraints are projected on certain angular momenta and parities,and the generator coordinate method is used to simultaneously consider configurational mixing.

关键词： states parity collective

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Novel fluorene-carzazole-based conjugated copolymers containing pyrazoline and benzothiazole segments for blue light-emitting materials

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Chinese Chemical Letters 2007年第12期18卷 1496-1500页

作者： Hao Chen Xing Xu He Gang Yan xian rong Cai Ying Li Qing Jiang Ming Gui Xie College of Chemistry Sichuan University Chengdu 610064 China

A series of novel fluorene-carbazole-based copolymers with pyrazoline and benzothiazole units were synthesized successfully through Suzuki coupling reactions. The molecular structures and thermal properties of these polymers were characterized by FTrIR, 1H NMR, DSC and TGA. GPC results indicated that the weight-average molecular weight （Mw） and polydispersity of these polymers were in range （12,0（0）-14,000） and （1.8-2.0）, respectively. The two resulting polymers have high photoluminescence quantum efficiency implying that they may be promising candidates for polymer light-emitting diodes （PLEDs）.

关键词： Fluorene-carbazole copolymers Pyrazoline Bezothiazole

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