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Journal of Environmental Sciences 2020年第10期32卷 127-137页

作者： Shengbo Li Lijia Dong Zuofu Wei Guodong Sheng kui du Baowei Hu School of Life Science School of Chernistry and Chemical EngineeringShaoxing UniversityShaoxing 312000China School of Life Science Shanxi Normal UniuersityLinfen 041004China

Herein,we developed the invasive plant-derived biochar (IPB) functionalized with CaAl-LDH at five mass ratios using a physical mixture method,assessed their adsorption perform for Eu(Ⅲ),and explored the relative *** show that the IPB successfully loaded CaAl-LDH in five composites and their Eu(Ⅲ) sorption affinities were strongly affected by solution p H,contact time,temperature,and the mass ratio of LDH and *** the sorpiton process for Eu(Ⅲ) occurred on the heterogeneous surface of five composites and the boundary layer diffusion limited the chemical sorption ***,the CaAl-LDH/IPB composite with high ratio of IPB had higher sorption capacity than the one with high ratio of LDH due to larger porosity of the *** mechanisms containing ion exchange between Al and Eu ions,surface complexation with carboxyl-and oxygen-containing functional groups,and precipitation were involved in the Eu(Ⅲ) sorption,but the dominant sorption mechanism for each CaAl-LDH/IPB composite differed with different mass ratio of CaAl-LDH and *** composite with more IPB (e.g.,CaAl-LDH/IPB-13),both ion exchange and surface complexes dominated the sorption process and the intensity of Eu^3+ was identified with the one of *** in composites with high LDH,ion exchange dominated the sorption and the intensity of Eu^3+ was obviously higher than the one of Eu_2O_*** research will provide a new perspective for the application of the LDH/biochar materials.

关键词： Invasive plants Biochar LDH Europium sorption

A Second-Order Method for the Electromagnetic Scattering from a Large Cavity

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Numerical Mathematics(Theory,Methods and Applications) 2008年第4期1卷 357-382页

作者： Yingxi Wang kui du Weiwei Sun Department of Mathematics City University of Hong Kong Hong Kong.

In this paper,we study the electromagnetic scattering from a two dimen- sional large rectangular open cavity embedded in an infinite ground plane,which is modelled by Helmholtz *** introducing nonlocal transparent boundary con- ditions,the problem in the open cavity is reduced to a bounded domain problem.A hypersingular integral operator and a weakly singular integral operator are involved in the TM and TE cases,respectively.A new second-order Toeplitz type approximation and a second-order finite difference scheme are proposed for approximating the hyper- singular integral operator on the aperture and the Helmholtz in the cavity,respectively. The existence and uniqueness of the numerical solution in the TE case are established for arbitrary wavenumbers.A fast algorithm for the second-order approximation is pro- posed for solving the cavity model with layered *** results show the second-order accuracy and efficiency of the fast *** important is that the algorithm is easy to implement as a preconditioner for cavity models with more general media.

关键词： Electromagnetic scattering Helmholtz equation fast algorithm Toeplitz matrix second-order method.

Microstructure of Carbides at Grain Boundaries in Nickel Based Superalloys

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Journal of Materials Science & Technology 2012年第11期28卷 1031-1038页

作者： Xiaoming Dong Xiaoli Zhang kui du Yizhou Zhou Tao Jin Hengqiang Ye Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

It is well known that carbides at grain boundaries play an nickel based superalloys. In order to deeply understand the mportant role in affecting mechanical properties of relationship between grain boundary structures and properties, in this work, we have investigated the microstructure of grain boundaries with different misorienta- tion angles in bicrystals of nickel based superalloys. It is found that the bicrystals with smaller misorientation angles contain denser M23C6 but sparse MC particles at grain boundaries, and this kind of bicrystals presents longer stress rupture lives. It was observed that MC carbides were decorated by M23C6 and M6C particles at grain boundaries. The formation of these carbide particles, therefore, is likely due to the local fluctuation of chemical composition around MC carbides. In addition, the orientation relationships between MC carbides and γ/γ1 matrix were also determined.

关键词： Electron microscopy Ni based superalloys Grain boundaries Orientation relationship

Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100℃/150 MPa

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 446-458页

作者： Yi-Fei Li Li Wang Gong Zhang Dong-Qing Qi kui du Lang-Hong Lou Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

The influence of orientation on the stress rupture behaviors of a 3 rd-generation nickel-based single-crystal superalloy was investigated at 1100℃/150 *** is found that the stress rupture anisotropy is shown at 1100℃,but not so obvious compared with that at intermediate *** [001] specimens display the longest rupture life,[111] specimens show the shortest rupture life,and [011] specimens exhibit the intermediate *** observations show that the final fracture is caused by crack initiation and propagation,and the anisotropy of three oriented specimens is related to the fracture modes,γ/γ’ microstructures,interfacial dislocation networks and cutting mechanisms in y’ *** [001] specimens,N-type rafted structures are formed which can well hinder the slip and climb of ***,the regular interfacial dislocation networks can prevent dislocations from cutting into y’ phase,leading to the improvement of the creep *** [011] specimens,±45°rafted structures and irregular networks result in less strain *** [111] specimens,a large number of crack propagation paths and inhomogeneous deformations caused by irregular rafted structures deteriorate the property and result in the shortest ***,a[100] superdislocations with low mobility are widely formed in[001] and [011] specimens which suggests the low creep strain rate during steady creep stage,whereas superdislocations in[111] specimens possess high mobility,which indicates the high strain rate and corresponding poor stress rupture property.

关键词： Single-crystal superalloy Stress rupture Anisotropy Microstructure Dislocation

Interactions between dislocations and twins in deformed titanium aluminide crystals

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Journal of Materials Science & Technology 2019年第3期35卷 402-408页

作者： Guang Yang Shang-Yi Ma kui du Dong-Sheng Xu Sen Chen Yang Qi Heng-Qiang Ye School of Materials Science and Engineering Northeastern University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Division of Titanium Alloys Institute of Metal Research Chinese Academy of Sciences Department of Materials Physics and Chemistry School of Materials Science and Engineering Northeastern University

Using scanning, transmission electron microscopy and aberration-corrected scanning transmission electron microscopy, we have studied the interactions between dislocations and twins in impact deformed polysynthetic twinned TiAl crystal. The 1/3 dislocations with the coherent twin *** abnormal stacking fault was found adjacent to the coherent twin boundary. It has the same stacking sequence but different atom species in the [110] direction with an additional displacement of 1/4[110]in two neighboring {111} layers, and is likely induced by the slip of a 1/12[112](i.e. 1/4[110] + 1/6[211])dislocation.

关键词： TiAl Dynamic deformation Twins Dislocations Abnormal stacking fault

Dissociation of Tilt Dislocation Walls in Au

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1787-1792页

作者： Yu-Juan Geng Chun-Yang Wang Jing-Xin Yan Zhen-Jun Zhang Hua-Jie Yang Jin-Bo Yang kui du Zhe-Feng Zhang Shi-Changxu Innovation Centerfor Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Chongqing Jiaotong UniversityChongqing 400074China

The movement or dissociation of dislocations is signifi cantly important for better understanding the plastic deformation mechanisms and mechanical properties of *** is commonly believed that a dislocation/2 in Au is easy to dissociate into a pair of Shockley partial dislocations/6 due to low stacking fault energy(SFE).Contrary to this prevailing perception,the present atomistic modeling demonstrates that this reaction could be completely suppressed when dislocations/2 are grouped into tilt walls,consistent with our experimental *** phenomenon is actually the extreme case accompanying with the variation of Burgers vectors of partials with tilt angle,as revealed by a series of simulations,from which it is clearly seen that the Burgers vectors of partials deviate considerably from that of Shockley partials,enormously depending on the tilt *** fi ndings could facilitate a better understanding on many phenomena and properties of face-centered cubic metals(FCC).

关键词： Dislocation Tilt wall Stacking fault Dissociation Grain boundary

Structural,physicochemical,antioxidant and in vitro digestibility properties of banana flours from different banana varieties(Musa spp.)

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Food Bioscience 2022年第3期47卷 231-239页

作者： Lei Chang Min Yang Ning Zhao Fei Xie Pengtao Zheng Jonatha Simbo Xiuzhu Yu Shuang-kui du College of Food Science and Engineering Northwest A&F UniversityYanglingShaanxi712100China Tontan Project Technology Company Ltd. Dar Es Salaam10848Tanzania Intratech Limited Dar Es Salaam76124Tanzania Engineering Research Center of Grain and Oil Functionalized Processing Universities of Shaanxi ProvinceYanglingShaanxi712100China

Green bananas occupy an important position in the diet of Tanzanians with potential beneficial health *** flours prepared from five Tanzania banana varieties(Mzuzu,Malindi,Mshale,Bukoba,and Moshi)were compared for the proximate composition,structure,physicochemical properties,antioxidant activities,and in vitro digestibility *** total starch content of banana flours was 58.01%-68.74%,and the amylose content was 16.67%-23.11%.All the samples exhibited B-type *** had the highest pasting temperature and peak viscosity,and Malindi had the lowest *** peak temperature(Tp)and the enthalpy change(ΔH)of samples differed from 65.99◦C to 67.25℃ and from 7.98 to 12.59 J/g,*** total polyphenol content and total flavonoid content in banana flour were positively correlated with DPPH and FRAP values,*** and Moshi presented the stronger antioxidant activities among the *** flours with the high resistant starch(RS)content(89.20%-90.86%of total starch)were highly resistant to enzyme *** flour can be considered as a potential source of bioactive *** varying physicochemical properties of banana flours from different varieties could broaden their application as formulations in food and nonfood industries and promote the rational utilization of banana resources of Tanzania.

关键词： Banana flour Proximate composition Crystallinity Gelatinization Antioxidant activity Resistant starch

Effect of individualized therapy for AIDS patients with cytomegalovirus retinitis in intravitreal ganciclovir injections

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International Journal of Ophthalmology(English edition) 2019年第8期12卷 1351-1355页

作者： Lian-Yong Xie Chao Chen Wen-Jun Kong kui-Fang du Chun-Gang Guo Hong-Wei Dong Wen-Bin Wei Beijing YouAn Hospital Capital Medical UniversityBeijing100069China Beijing Tongren Eye Center Beijing Key Laboratoryof Intraocular Tumor Diagnosis and TreatmentBeijingOphthalmology&Visual Sciences Key LabBeijing Tong RenHospitalCapital Medical UniversityBeijing100730China

The effect of intravitreal ganciclovir injection combined with intravenous infusion on acquired immune deficiency syndrome(AIDS) patients with cytomegalovirus retinitis(CMVR) was investigated. A total of 32 eyes in 23 AIDS patients diagnosed as CMVR from 2017 to 2018 were included in the retrospective study. All patients underwent induction therapy by using intravenous drip of the anticytomegalovirus(CMV) agent ganciclovir(5 mg/kg q12 h) combined with intravitreal ganciclovir injection(3 mg/time, 2 times/wk). The visual acuity, fundus photographs, lesion location, and number of intravitreal injections were observed preoperatively and postoperatively. Totally 14 eyes were cured during induction therapy. The number of injections [4.13(2 to 6)] in CMVR patients with peripherally fundus lesions were significantly lower than those with central lesions (4.89(2 to 6))The individualized therapy of intravitreal ganciclovir injections for AIDS patients with CMVR can effectively reduce the numbers of intravitreal injections.

关键词： cytomegalovirus retinitis acquired immune deficiency syndrome ganciclovir intravitreal injection monotherapy

Numerical and Experimental Study on Stiffened Composite Panel Repaired by Bolted Joints under Compressive Load

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Journal of Applied Mathematics and Physics 2018年第8期6卷 1763-1771页

作者： Jifeng Xu Yuanpei Lan Xingming Zhang kui du Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials Beijing Aeronautical Science & Technology Research Institute Beijng China

Numerical and experimental study was conducted to investigate the failure mode and strength performance of stiffened composite panel repaired by bolted joints under compressive load, and the results were then compared with those from virgin stiffened composite panel without any damage. A finite element analysis model was established for repaired and virgin stiffened composite panels under compressive load, the 3D Hashin criteria was applied to identify the composite structure failure, and the secondary stress criteria was adopted to identify the adhesive failure between the base laminate and the stiffener. The failure modes of repaired stiffened composite panels were stiffened composite panels breaking off along the bolt joints. The experimental results were consistent with the finite element analysis results, indicating the reliability of the finite element analysis model.

关键词： Stiffened Composite Panel Bolted Joints Repair Compression Performance 3D Finite Element Model

Upregulation of KLK8 contributes to diabetic cardiac fibrosis through promoting endothelial-to-mesenchymal transition

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Upregulation of KLK8 contributes to diabetic cardiac fibrosi...