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An expandable chamber for safe brain retraction: new technologies in the field of transcranial endoscopic surgery

Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2023年第4期24卷 326-335页

作者： Elena ROCA Anna GOBETTI Giovanna CORNACCHIA Oscar VIVALDI Barbara BUFFOLI Giorgio RAMORINO Head and Neck Department NeurosurgeryIstituto Ospedaliero Fondazione Poliambulanza25124 BresciaItaly Technology for Health PhD Program University of Brescia25124 BresciaItaly Materials Science and Technology at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Metallurgy at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Anatomy and Physiopathology Division Department of Clinical and Experimental SciencesUniversity of Brescia25123 BresciaItaly

Neurosurgery is a highly specialized field:it often involves surgical manipulation of noble structures and cerebral retraction is frequently necessary to reach deep-seated brain *** are still no reliable methods preventing possible retraction *** objective of this study was to design work chambers well suited for transcranial endoscopic surgery while providing safe retraction of the surrounding brain *** chamber is designed to be inserted close to the intracranial point of interest;once it is best placed it can be *** should guarantee an appreciable workspace similar to that of current neurosurgical *** experimental aspect of this study involved the use of a force sensor to evaluate the pressures exerted on the brain tissue during the retraction *** pterional craniotomy,pressure measurements were made during retraction with the use of a conventional metal spatula with different *** that,although the force values necessary for retraction and exerted on the spatula by the neurosurgeon are the same,the local pressure exerted on the parenchyma at the edge of the spatula at different inclinations varied greatly.A new method of cerebral retraction using a chamber retractor(CR)has been designed to avoid any type of complication due to spatula edge overpressures and to maintain acceptable pressure values exerted on the parenchyma.

关键词： Brain retraction Spatula Brain retractor design Brain retraction injury Retraction complication Transcranial endoscopic surgery

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Role of Cu-Containing MEA Binder and Sintering Temperatures on Synthesis and Characteristics of Tungsten-Based Alloys

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Metals and materials International 2023年第6期29卷 1739-1749页

作者： Chen, Chun-Liang Sutrisna Department of Materials Science and Engineering National Dong Hwa University No. 1 Sec. 2 Da Hsueh Rd Hualien Shoufeng97401 Taiwan Department of Mechanical Engineering Institut Teknologi Nasional Yogyakarta55281 Indonesia

Tungsten-based alloys doped with the 10 wt% FeCoNiCu medium entropy alloy (MEA) binder were fabricated by mechanical alloying. The role of the Cu-containing MEA binder and sintering temperatures (1250–1450℃) on the synthesis, sintering behavior, and mechanical properties of the model tungsten alloys were investigated. The results demonstrate that the solid-to-liquid phase transition during sintering was strongly influenced by the presence of Cu in the binder and sintering temperatures. A good combination of high compressive strength (2080 MPa), failure strain (42%), and hardness (419 HV) was achieved at the low sintering temperature (1250 ℃), which promoted a fined grain structure with semisolid state sintering. However, Fe-rich oxide layers were formed along the grain boundaries at the high sintering temperature (1450 ℃) and caused a poor bonding strength between the binder phase and W matrix, thereby resulting in significant degradation of mechanical properties. Graphical Abstract: [Figure not available: see fulltext.] © 2022, The Author(s) under exclusive licence to The Korean Institute of Metals and materials.

关键词： mechanical alloying

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Machine learning predictions of irradiation embrittlement in reactor pressure vessel steels

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npj Computational materials 2022年第1期8卷 795-805页

作者： Yu-chen Liu Henry Wu Tam Mayeshiba Benjamin Afflerbach Ryan Jacobs Josh Perry Jerit George Josh Cordell Jinyu Xia Hao Yuan Aren Lorenson Haotian Wu Matthew Parker Fenil Doshi Alexander Politowicz Linda Xiao Dane Morgan Peter Wells Nathan Almirall Takuya Yamamoto G.Robert Odette Materials Science and Engineering Department University of Wisconsin-MadisonMadisonWI53706USA Hierarchical Green-Energy Materials(Hi-GEM)Research Center National Cheng Kung UniversityTainan70101TaiwanCHINA Materials Science and Engineering Department National Cheng Kung UniversityTainan70101TaiwanCHINA Mechanical Engineering Department University of CaliforniaSanta BarbaraCA93106USA

Irradiation increases the yield stress and embrittles light water reactor(LWR)pressure vessel *** this study,we demonstrate some of the potential benefits and risks of using machine learning models to predict irradiation hardening extrapolated to low flux,high fluence,extended life *** machine learning training data included the Irradiation Variable for lower flux irradiations up to an intermediate fluence,plus the Belgian Reactor 2 and Advanced Test Reactor 1 for very high flux irradiations,up to very high ***,the machine learning model predictions for the high fluence,intermediate flux Advanced Test Reactor 2 irradiations are superior to extrapolations of existing hardening *** successful extrapolations showed that machine learning models are capable of capturing key intermediate flux effects at high *** approaches,applied to expanded databases,could be used to predict hardening in LWRs under life-extension conditions.

关键词： life irradiation expanded

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Effects of laser processing parameters on properties of laserinduced graphene by irradiating CO_(2) laser on polyimide

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science China(Technological sciences) 2022年第1期65卷 41-52页

作者： LIU Ming WU JiaNan CHENG HuanYu School of Mechanical Engineering and Automation Fuzhou University Qishan CampusFuzhou 350116China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity Park PA 16802USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity Park PA 16802USA

The emerging technique of carbonization of polyimide(PI)by direct laser writing receives great attention for its flexibility,versatility,and ease-of-patterning capability in creating a variety of functional laser-induced graphene(LIG)sensors and *** prepared by CO_(2) laser irradiating of the PI film is characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),transmission electron microscope(TEM),specific surface area analyzer,synchronous thermal analysis,and Raman spectroscopy with the focus on investigating the effects of laser parameters(e.g.,power,scanning speed)on the microstructure,thickness,and sheet resistance of *** TEM and XRD indicate that LIG is composed of many graphene layers with a layer spacing of 0.34 *** specific surface area of LIG decreases with the increase of laser *** ratio of the thickness of LIG over the depth of the carbonized PI film as the expansion ratio characterizes the expansibility of *** influence of image resolution and off-focus value on the sheet resistance of LIG is explained by the superposition mechanism of laser scanning spots.

关键词： CO_(2)laser laser parameters laser-induced graphene characterization sheet resistance

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Recent progress in application of cobalt-based compounds as anode materials for high-performance potassium-ion batteries

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Rare Metals 2022年第10期41卷 3301-3321页

作者： Fei Yuan Ya-Chuan Shao Bo Wang Yu-Sheng Wu Di Zhang Zhao-Jin Li Yi-min A.Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China Hebei Key Laboratory of Flexible Functional Materials School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050000China Department of Mechanical and Mechatronics Engineering and Waterloo Institute of NanotechnologyUniversity of WaterlooWaterlooONN2L 3G1Canada

Potassium-ion batteries(KIBs)are regarded as one of the most promising replacements for lithium-ion batteries because of their low cost and high *** suitable anode materials to stably and effectively store potassium is critical for the development of *** their high theoretical specific capacity,cobalt-based compounds have been extensively investigated as an anode material in recent years;however,specific reviews summarizing the research progress in the application of cobaltbased compounds as anode materials for high-performance KIBs are ***,this review systematically summarizes the recent states of cobalt-based anode materials in KIBs starting at the potassium storage mechanism,followed by strategies and applications to improve the electrochemical *** current challenges are also discussed,and corresponding prospects are *** work may facilitate the realization of various applications of cobalt-based compound anodes for highperformance rechargeable batteries and is expected to provide some guidance for developing other metal-based compounds for KIBs anodes.

关键词： Cobalt-based material Anode Potassium-ion battery(KIBs) Electrochemical performance

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Dense carbon nanofiber self-supporting electrode fabricated by orientation/compaction strategy for high volumetric lithium storage capacity

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Progress in Natural science:materials International 2025年第1期35卷 229-237页

作者： Haihui Liu Chaoqun Chen Qiang Xu Yan Song Xiangwu Zhang Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong University CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University

Low bulk density greatly restricts the large-scale application of electrospun carbon-based fiber membrane as electrode in energy storage devices. To solve the above challenges, herein an orientation-compaction densification strategy is proposed to enhance the bulk density and volumetric capacity of PAN-based carbon nanofiber membranes as self-supporting electrode used in lithium-ion batteries（LIBs）. Specifically, highly-oriented fibers are achieved by high-speed roller collecting during electrospinning, and compaction densification is conducted by hot-pressing treatment. The effects of collecting speed and hot-pressing pressure on the morphology, conductivity,bulk density, tensile strength, and flexibility of the obtained carbon nanofiber membrane are *** to conventional fiber membranes, of which fibers are disorderly stacked, the oriented fiber membrane is much easier to achieve dense stacking by compaction. The obtained dense carbon nanofiber membrane demonstrates a bulk density of 0.566 g cm-3, and shows a significantly-enhanced volumetric capacity(318.3 mA h cm-3), high-rate performance(86.6 mA h cm-3at 5 A g-1), and satisfactory cycling stability when used as selfsupporting electrode of LIBs.

关键词： Bulk density Densification Electrospinning Orientation-compaction Volumetric capacity

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High-yield and rapid isolation of extracellular vesicles by flocculation via orbital acoustic trapping:FLOAT

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Microsystems & Nanoengineering 2024年第1期10卷 313-323页

作者： Joseph Rufo Peiran Zhang Zeyu Wang Yuyang Gu Kaichun Yang Joseph Rich Chuyi Chen Ruoyu Zhong Ke Jin Ye He Jianping Xia Ke Li Jiarong Wu Yingshi Ouyang Yoel Sadovsky Luke P.Lee Tony Jun Huang Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNCUSA Department of Biomedical Engineering Duke UniversityDurhamNCUSA Department of Obstetrics Gynecologyand Reproductive SciencesMagee-Womens Research InstituteUniversity of PittsburghPittsburghPAUSA Department of Microbiology and Molecular Genetics School of MedicineUniversity of PittsburghPittsburghPAUSA Renal Division and Division of Engineering in Medicine Department of MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMAUSA Department of Bioengineering Department of Electrical Engineering and Computer ScienceUniversity of CaliforniaBerkeleyBerkeleyCAUSA Department of Biophysics Institute of Quantum BiophysicsSungkyunkwan UniversitySuwonKorea

Extracellular vesicles(EVs)have been identified as promising biomarkers for the noninvasive diagnosis of various ***,challenges in separating EVs from soluble proteins have resulted in variable EV recovery rates and low ***,we report a high-yield(>90%)and rapid(<10 min)EV isolation method called FLocculation via Orbital Acoustic Trapping(FLOAT).The FLOAT approach utilizes an acoustofluidic droplet centrifuge to rotate and controllably heat liquid *** adding a thermoresponsive polymer flocculant,nanoparticles as small as 20 nm can be rapidly and selectively concentrated at the center of the *** demonstrate the ability of FLOAT to separate urinary EVs from the highly abundant Tamm-Horsfall protein,addressing a significant obstacle in the development of EV-based liquid *** to its high-yield nature,FLOAT reduces biofluid starting volume requirements by a factor of 100(from 20 mL to 200µL),demonstrating its promising potential in point-of-care diagnostics.

关键词： trapping utilize separating

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Self-supported porous heterostructure WC/WO_(3−x)ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

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Journal of Advanced Ceramics 2022年第8期11卷 1208-1221页

作者： Feihong WANG Binbin DONG Junwei WANG Nianwang KE Chuntian TAN Anding HUANG Yutong WU Luyuan HAO Liangjun YIN Xin XU Yuxi XIAN Simeon AGATHOPOULOS CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Henan Key Laboratory of Special Protective MaterialsLuoyang Institute of Science and TechnologyLuoyang 471023China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China School of Energy Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Mechanical Behaviors and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China Department of Materials Science and Engineering University of IoanninaIoannina GR-45110Greece

Tungsten carbide(WC)-based materials are widely considered as the hydrogen evolution reaction(HER)process catalysts due to their“Pt-like”electronic ***,traditional powder electrodes have a high cost,and display problems related to the process itself and the poor stability over operation *** paper presented a self-supported asymmetric porous ceramic electrode with WO_(3-x)whiskers formed in situ on the walls of the finger-like holes and membrane surface,which was prepared by combining phase inversion tape-casting,pressureless sintering,and thermal treatment in a CO_(2) *** optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current *** specifically,it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec^(-1)at 10 mA·cm^(-2)in acidic and alkaline media,*** superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency,which was favored by the in situ developed WC/WO_(3-x)heterostructure and the oxygen vacancies.

关键词： hydrogen evolution reaction(HER) porous ceramic membrane WC/WO_(3−x)heterostructure self-supported electrode oxygen vacancies

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Giant phonon-skyrmion coupling in ferromagnet/heavy metal heterostructures

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Physical Review B 2024年第6期110卷 064423-064423页

作者： Egor Savostin Vitaliy Lomakin Program in Materials Science and Engineering Center for Memory and Recording Research Department of Electrical and Computer Engineering

The strong impact of the strain-induced Dzyaloshinskii-Moriya interaction (SIDMI) on the magnetization dynamics of skyrmions in nanomagnetic structures is demonstrated. The effects of SIDMI are characterized by skyrmion equations (SEs) of motion and magnetoelastic (ME) equations. The study is performed on a model system of MgO/CoFe/Pt stacked on a piezoelectric substrate. The results demonstrate a major nonlinear amplification in both the first- and higher-harmonic magnitudes of the skyrmion breathing mode due to SIDMI. Remarkably, this enhancement can trigger a skyrmion collapse, enabling its deletion with ultraweak strain-induced excitations. The SIDMI effect is shown to be much more significant than the conventional ME effect. These findings open different avenues for the efficient manipulation of nanomagnetic structures through strain.

关键词： Exchange interaction Magnetic interactions Magnetization dynamics Magnetoacoustic effect Micromagnetism Spin dynamics

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Efficient Semi‑Transparent Wide‑Bandgap Perovskite Solar Cells Enabled by Pure‑Chloride 2D‑Perovskite Passivation

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Nano-Micro Letters 2023年第8期15卷 35-48页

作者： Liu Yang Yongbin Jin Zheng Fang Jinyan Zhang Ziang Nan Lingfang Zheng Huihu Zhuang Qinghua Zeng Kaikai Liu Bingru Deng Huiping Feng Yujie Luo Chengbo Tian Changcai Cui Liqiang Xie Xipeng Xu Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021People’s Republic of China MOE Engineering Research Center for Brittle Materials Machining Institute of Manufacturing EngineeringCollege of Mechanical Engineering and AutomationHuaqiao UniversityXiamen 361021People’s Republic of China Gold Stone(Fujian)Energy Company Limited Quanzhou 362005People’s Republic of China Collaborative Innovation Center of Chemistry for Energy Materials Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005People’s Republic of China

Wide-bandgap(WBG)perovskite solar cells suffer from severe non-radiative recombination and exhibit relatively large opencircuit voltage(V_(OC))deficits,limiting their photovoltaic ***,we address these issues by in-situ forming a well-defined 2D perovskite(PMA)_(2)PbCl_(4)(phenmethylammonium is referred to as PMA)passivation layer on top of the WBG active *** 2D layer with highly pure dimensionality and halide components is realized by intentionally tailoring the side-chain substituent at the aryl ring of the post-treatment ***-principle calculation and single-crystal X-ray diffraction results reveal that weak intermolecular interactions between bulky PMA cations and relatively low cation-halide hydrogen bonding strength are crucial in forming the well-defined 2D ***(PMA)_(2)PbCl_(4)forms improved type-I energy level alignment with the WBG perovskite,reducing the electron recombination at the perovskite/hole-transport-layer *** this strategy in fabricating semi-transparent WBG perovskite solar cells(indium tin oxide as the back electrode),the V_(OC)deficits can be reduced to 0.49 V,comparable with the reported state-of-the-art WBG perovskite solar cells using metal ***,we obtain hysteresis-free 18.60%-efficient WBG perovskite solar cells with a high V_(OC)of 1.23 V.

关键词： Wide-bandgap perovskite solar cells Transparent back electrodes Defect passivation Bulky cations

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