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The characterization of Fe-rich phases in a high-pressure die cast hypoeutectic aluminum-silicon alloy

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Journal of Materials Science & Technology 2020年第16期47卷 54-62页

作者： X.Y.Jiao C.F.Liu z.p.guo G.D.Tong S.L.Ma Y.Bi Y.F.zhang S.M.Xiong School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials processing Technology Tsinghua UniversityBeijing 100084China China FAW Foundary Co. LTDChangchun 130011China

Both microstructural characteristics and fracture behavior of Fe-rich phases in a high-pressure die-cast hypoeutectic Al-Si alloy were *** was focused on the morphology and formation mechanism of Fe-rich phases,together with their influence on *** show that primary Ferich phases exhibited in blocky shape precipitated from liquid while secondary Fe-rich phase in a large net shape was distributed along eutectic boundary participating in a ternary eutectic *** synchrotron X-ray tomography characterization,three Fe-rich phases with different morphologies,i.e.,polyhedral shape,fine compact shape and Chinese script-type shape were extracted along the radial *** slow-shot speed promoted the polyhedral Fe-rich phase to precipitate in slow-shot sleeve while decreased the formation of fine compact and Chinese script-type Fe-rich phases in die *** of a worse deformation compatibility,polyhedral Fe-rich phases fractured and became stress concentration sources before the failure of the casting.

关键词： Hypoeutectic Al-10Si Fe-rich phases Fracture morphology High pressure die casting

The Impact of Nanocomposite Materials on Lithium Ion Batteries

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复旦学报（自然科学版） 2007年第5期46卷 667-页

作者： z.p.guo S.H.Ng z.W.zhao K.Konstantinov H.K.Liu Institute for Superconducting and Electronic Materials University of Wollongong

1 Results Lithiumion batteries have become the power source of choice for consumer electronic devices such as cell phones and laptop computers due to their high energy density and long cycle life. In addition,lithium-ion batteries are expected to be a major breakthrough in the hybrid vehicle *** their successful commercial application,further performance improvement of the lithium ion battery is still *** and nanotechnologies can lead to a new generation of lithium secondary...

关键词： nanocomposite lithium ion batteries

Rational design of AgGaS/znS/znS quantum dots with a near-unity photoluminescence quantum yield via double shelling scheme

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Journal of Materials Science & Technology 2024年第2期169卷 235-242页

作者： H.X.Lu H.Liu z.z.Fu Y.Y.Chen H.Q.Dai z.Hu W.L.zhang R.Q.guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University YiwuZhejiang 322000China zhongshan-Fudan Joint Innovation Center Zhongshan 528437China

In this study,a two-step method was used to synthesize highly luminescent AgGaS/znS/znS quantum dots(QDs).In the first step,an inner znS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer znS shell,thereby facilitating the formation of a thick outer *** the two-step shelling process,the synthesized AgGaS/znS/znS QDs showed an excellent photoluminescence quantum yield(pLQY)of 96.4%with a peak wavelength of 508 nm,repre-senting the highest pLQY reported thus far for AgGaS ***,the effect of halogen ions in zn precursors on the shelling process was *** was proposed that the capacity of halogen ions to coordinate with the QDs influenced the balance between zn cation diffusion and znS shelling ***,the znS shelling reaction was dominant when znCl_(2)was employed,while zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the znS shelling and offers a clear map for the tailored synthesis of core/shell QDs.

关键词： AgGaS Quantum dots photoluminescence Core/shell Alloyed core/shell interface

Electromagnetic performance Analysis of Variable Flux Memory Machines with Series-magnetic-circuit and Different Rotor Topologies

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 3-11页

作者： Qiang Wei z.Q.zhu Yan Jia Jianghua Feng Shuying guo Yifeng Li Shouzhi Feng Department of Electronic and Electrical Engineering The University of SheffieldSheffield S13JDU.K. IEEE the CRRC zhuzhou Institute Company Ltd. Zhuzhou 412001China

In this paper,the electromagnetic performance of variable flux memory(VFM)machines with series-magnetic-circuit is investigated and compared for different rotor *** on a V-type VFM machine,five topologies with different interior permanent magnet(IpM)arrangements are evolved and optimized under same *** on two-dimensional(2-D)finite element(FE)method,their electromagnetic performance at magnetization and demagnetization states is *** reveals that the iron bridge and rotor lamination region between constant pM(CpM)and variable pM(VpM)play an important role in torque density and flux regulation(FR)***,the global efficiency can be improved in VFM machines by adjusting magnetization state(MS)under different operating conditions.

关键词： Memory machine permanent magnet Rotor topologies Series magnetic circuit Variable flux

Decellularised extracellular matrix-based injectable hydrogels for tissue engineering applications

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Biomaterials Translational 2024年第2期5卷 114-128页

作者： guo W.-Y. Wang W.-H. Xu p.-Y. Kankala R.K. Chen A.-z. Institute of Biomaterials and Tissue Engineering Huaqiao University Fujian Province Xiamen China Fujian provincial Key Laboratory of Biochemical Technology (Huaqiao University) Fujian Province Xiamen China

Decellularised extracellular matrix (dECM) is a biomaterial derived from natural tissues that has attracted considerable attention from tissue engineering researchers due to its exceptional biocompatibility and malleability attributes. These advantageous properties often facilitate natural cell infiltration and tissue reconstruction for regenerative medicine. Due to their excellent fluidity, the injectable hydrogels can be administered in a liquid state and subsequently formed into a gel state in vivo, stabilising the target area and serving in a variety of ways, such as support, repair, and drug release functions. Thus, dECM-based injectable hydrogels have broad prospects for application in complex organ structures and various tissue injury models. This review focuses on exploring research advances in dECM-based injectable hydrogels, primarily focusing on the applications and prospects of dECM hydrogels in tissue engineering. Initially, the recent developments of the dECM-based injectable hydrogels are explained, summarising the different preparation methods with the evaluation of injectable hydrogel properties. Furthermore, some specific examples of the applicability of dECM-based injectable hydrogels are presented. Finally, we summarise the article with interesting prospects and challenges of dECM-based injectable hydrogels, providing insights into the development of these composites in tissue engineering and regenerative medicine. © 2024, Chinese Medical Multimedia press Co Ltd. All rights reserved.

关键词： decellularisation methods decellularised extracellular matrix injectable hydrogels tissue engineering

HI in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9

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Research in Astronomy and Astrophysics 2024年第1期24卷 292-299页

作者： Yan guo C.Sengupta T.C.Scott p.Lagos Y.Luo purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Institute of Astrophysics and Space Sciences(IA porto) Rua das Estrelas4150-762PortoPortugal

We present resolved Giant Metrewave Radio Telescope H I observations of the high gas-phase metallicity dwarf galaxy WISEA J230615.06+143927.9(z = 0.005)(hereafter J2306) and investigate whether it could be a Tidal Dwarf Galaxy(TDG) candidate. TDGs are observed to have higher metallicities than normal dwarfs. J2306 has an unusual combination of a blue g-r color of 0.23 mag, irregular optical morphology and high-metallicity(12 +log(O/H) = 8.68 ± 0.14), making it an interesting galaxy to study in more detail. We find J2306 to be an H I rich galaxy with a large extended, unperturbed rotating H I disk. Using our H I data we estimated its dynamical mass and found the galaxy to be dark matter(DM) dominated within its H I radius. The quantity of DM, inferred from its dynamical mass, appears to rule out J2306 as an evolved TDG. A wide area environment search reveals J2306 to be isolated from any larger galaxies which could have been the source of its high gas metallicity. Additionally, the H I morphology and kinematics of the galaxy show no indication of a recent merger to explain the *** detailed optical spectroscopic observations of J2306 might provide an answer to how a seemingly ordinary irregular dwarf galaxy achieved such a high level of metal enrichment.

关键词： galaxies:abundances galaxies:dwarf galaxies:irregular radio lines:galaxies radio lines:ISM

proof of Two Supercongruences of Truncated Hypergeometric Series_(4)F_(3)

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1015-1028页

作者： guo Shuai MAO Department of Mathematics Nanjing University of Information Science and TechnologyNanjing 210044P.R.China

In this paper,we prove two supercongruences conjectured by z.-*** via the Wilf-zeilberger *** of them is,for any prime p>3,4F3[7/6 1/2 1/2 1/2 1/6 1 1]-1/8]-1/2≡p(-2/p)+p^(3)/4(2/p)Ep-3 (mod p^(4))where(·/p)stands f... 详细信息

关键词： Supercongruence truncated hypergeometric series Wilf–zeilberger method Euler numbers Legendre symbol

Membrane-coated nanoparticles as a biomimetic targeted delivery system for tumour therapy

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Biomaterials Translational 2024年第1期5卷 33-45页

作者： guo H. guo M. Xia z. Shao z. Department of Orthopaedic Beijing Jishuitan Hospital Capital Medical University Beijing China Department of Orthopaedic Beijing Jishuitan Hospital Fourth Medical College of Peking University Beijing China National Center for Orthopaedics Beijing China Department of Orthopaedics Affiliated Hospital of NCO School of Army Medical University Hebei Province Shijiazhuang China Centre for Nanohealth ILS2 Medical School Swansea University Swansea United Kingdom Department of Orthopaedics Union Hospital Tongji Medical College Huazhong University of Science and Technology Hubei Province Wuhan China

Drug therapy towards tumours often causes adverse effects because of their non-specific nature. Membrane-coated technology and membrane-coated nanoparticles provide an advanced and promising platform of targeted and safe delivery. By camouflaging the nanoparticles with natural derived or artificially modified cell membranes, the nano-payloads are bestowed with properties from cell membranes such as longer circulation, tumour or inflammation-targeting, immune stimulation, augmenting the performance of traditional therapeutics. In this review, we review the development of membrane coating technology, and summarise the technical details, physicochemical properties, and research status of membrane-coated nanoparticles from different sources in tumour treatment. Finally, we also look forward to the prospects and challenges of transforming membrane coating technology from experiment into clinical use. Taken together, membrane-coated nanoparticles are bound to become one of the most potential anti-tumour strategies in the future. © 2024, Chinese Medical Multimedia press Co Ltd. All rights reserved.

关键词： biomimetic targeted delivery system membrane-coated nanoparticles membrane-coated technology tumour therapy

Serum amylase as a novel prognostic marker of organophosphorus poisoning: a retrospective study

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Emergency and Critical Care Medicine 2024年第3期4卷 111-116页

作者： guo X. Chen z. Feng K. zeng S. zhang J. Ma z. Yuan C. School of Clinical Medicine Ningxia Medical University Ningxia Hui Yinchuan China Emergency Department General Hospital of Ningxia Medical University Ningxia Hui Autonomous Region Yinchuan China

Background: This study aims to explore the significance of serum amylase levels in patients with organophosphorus pesticide (Op) poisoning and to provide a new perspective for evaluating the severity and prognosis of Op poisoning. Methods: The clinical data of 67 patients with acute Op poisoning, who had been treated in the emergency department of the General Hospital of Ningxia Medical University between September 2020 and August 2022, were retrospectively analyzed. Using Spearman rank correlation, serum amylase levels during admission and severity of poisoning correlated with discharge outcomes. Based on serum amylase levels, receiver operating characteristic curves were plotted to predict the severity and mortality of patients who experience organophosphate poisoning. The optimal threshold serum amylase level at admission was determined based on the maximum Youden index. Results: Using Spearman rank correlation analysis, serum amylase levels at admission positively correlated with the severity of poisoning and discharge outcomes, but the degree of correlation was weak (rs: 0.344; 0.264; p patients’ serum amylase levels at admission had receiver operating characteristic area under the curve values of 0.726 and 0.735 to predict the degree of severe poisoning and death, respectively. Based on the maximum Youden index, the optimal threshold of serum amylase were 97.8 and 194.1 U/L when the degree of poisoning was severe and the discharge outcome of patients was died. In comparison to patients with serum amylase levels ≤194.1 U/L at admission, the OR values of death in patients with serum amylase levels >194.1 U/L at admission was 15.944 (95% CI: 1.825–139.274). Conclusion: Serum amylase levels in patients with organophosphate poisoning correlate with the degree of poisoning and discharge outcomes. Higher serum amylase level was a risk factor for organophosphorus poisoning death. © Wolters Kluwer Health, Inc. All rights reserved.

关键词： Amylase Emergency department Organophosphorus pesticide poisoning prognosis