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Improving corrosion resistance of additively manufactured WE43 magnesium alloy by high temperature oxidation for biodegradable applications

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Journal of Magnesium and Alloys 2024年第3期12卷 940-953页

作者： Jinge Liu Bangzhao Yin Fei Song Bingchuan Liu Bo peng peng wen Yun Tian Yufeng Zheng Xiaolin Ma Caimei Wang State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopaedics Beijing Tsinghua Changgung HospitalInstitute for Precision MedicineTsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing AKEC Medical Co. Ltd.Beijing 102200China

Laser powder bed fusion(L-PBF)has been employed to additively manufacture WE43 magnesium(Mg)alloy biodegradable implants,but WE43 L-PBF samples exhibit excessively rapid *** this work,dense WE43 L-PBF samples were built with the relativity density reaching 99.9%.High temperature oxidation was performed on the L-PBF samples in circulating air via various heating temperatures and holding *** oxidation and diffusion at the elevated temperature generated a gradient structure composed of an oxide layer at the surface,a transition layer in the middle and the *** oxide layer consisted of rare earth(RE)oxides,and became dense and thick with increasing the holding *** matrix was composed ofα-Mg,RE oxides and Mg_(24)RE_(5) *** precipitates almost disappeared in the transition *** passivation effect was observed in the samples treated by a suitable high temperature *** original L-PBF samples lost 40%weight after 3-day immersion in Hank’s solution,and broke into fragments after 7-day *** casted and solution treated samples lost roughly half of the weight after 28-day *** high temperature oxidation samples,which were heated at 525℃ for 8 h,kept the structural integrity,and lost only 6.88%weight after 28-day *** substantially improved corrosion resistance was contributed to the gradient structure at the *** one hand,the outmost dense layer of RE oxides isolated the corrosive medium;on the other hand,the transition layer considerably inhibited the corrosion owing to the lack of ***,high temperature oxidation provides an efficient,economic and safe approach to inhibit the corrosion of WE43 L-PBF samples,and has promising prospects for future clinical applications.

关键词： Laser powder bed fusion Biodegradable magnesium alloy High temperature oxidation Corrosion resistance WE43.

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Rock engineering property of the high-steep open-pit slope and its stability

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Journal of Coal Science & Engineering(China) 2010年第1期16卷 35-40页

作者： peng wen-bin YU Wei-jian School of Energy and Safety Engineering Hunan University of Science and Technology Xiangtan 411201 China

According to the rock engineering property and stability of high-steep open-pitslopes, various factors were collected on the basis of rock engineering system (RSE) theory,and the interaction matrix of stability evaluation was ***, the stabilityevaluation index (S_p) of the slope was put *** of the S_p value and the correspondingstable state were given on the basis of thirty-six *** is found that the followingrelationships exist: unstable (easy landslide): S_p***, the stability evaluation indexwas applied on the high-steep open-pit slope of one *** results and monitoringdata indicate that the index meets the necessity of the property of slope engineering, and ithas an important engineering purpose for landslide forecasting of high-steep slopes.

关键词： high-steep slope rock engineering system property stability evaluation open-pit mine

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Review on thermal-related measurement methods for superconducting devices and prospect for high-speed maglev transportation application

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Superconductivity 2022年第3期3卷 83-96页

作者： Jun Zheng Minghui Wei Siyi Quan Yicheng Feng peng wen State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031People’s Republic of China

High‐temperature superconducting(HTS)bulks can not only be self‐stable when levitated above a permanent magnet(PM)but also can be used as quasi PM with higher magnetic energy product due to their magnetic flux pinning ***,HTS bulks have wide application potentials in maglev trains,maglev bearings,flywheel energy storage,drug delivery,and high field *** the external magnetic field of common application scenarios,HTS bulks have no external input current,so it is difficult to achieve the overall ***,local quenching in the bulk is still possible in the harsh fluctuating external field *** it is difficult to reach the total quench,its critical parameters like Jc will inevitably deteriorate,which may collapse the application ***,in contrast to superconducting wires and tapes that are more concerned with quench detection,HTS bulks with a 3D volume effect are more focused on internal sensitive temperature locations,the impacts of volume and scale,and the coupling influence on application parameters such as magnetism and ***,for efficient thermal‐related measurement of HTS bulk applications,this paper investigates and discusses 12 commonly‐used temperature measurement or quench detection methods in all superconducting application *** methods primarily refer to the current quench detection technologies used in HTS tapes and *** the standpoint of practical temperature measurement requirements of HTS bulks and technological limitations of maglev application scenarios,working characteristics and service conditions of the 12 methods,and 4 temperature detection methods are selected through a comprehensive understanding and comparison of basic *** are expected to be used in real‐time monitoring and early warning schemes for onboard superconducting levitation devices of HTS maglev transportation or other applications in the future.

关键词： High‐temperature superconducting bulk Temperature sensitivity High‐temperature superconducting magnetic levitation High‐temperature superconducting tape Quench detection Temperature detection

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Resolution enhancement in hydrophobic interaction chromatography via electrostatic interactions

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Chinese Chemical Letters 2013年第5期24卷 419-421页

作者： Dong Gao Fu-Chun Tan wen-peng Wang Li-Li Wang Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of Ministry of Education Shaanxi Key Laboratory of Modern Separation ScienceInstitute of Modern Separation ScienceNorthwest University

In this work,a new type of hydrophobic stationary phase that provide electrostatic interactions with analytes was developed by bondingβ-phenylethylamine as a functional ligand to *** stationary phase can separate proteins with similar hydrophobicity that traditional hydrophobic resins *** egg white was separated to examine the *** results show that the introduced electrostatic interactions are an important factor for the resolution enhancement and the new resin could have important applications in separation and purification of biological macromolecules.

关键词： Hydrophobic interaction chromatography Electrostatic interaction Resolution Hen egg white

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Proteomics Study of COI1-regulated Proteins in Arabidopsis Flower

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Journal of Integrative Plant Biology 2010年第4期52卷 410-419页

作者： Lingling Chua Xiaoyi Shan Junxia Wang wen peng Guiyou Zhang Daoxin Xie Institute of Molecular and Cell Biology 61 Biopolis Drive Singapore 138673 protein Science Laboratory of the Ministry of Education School of Life Sciences Tsinghua University Beijing 100084 China

Jasmonates （JAs） are a new class of plant hormone that regulate expression of diverse genes to mediate various plant responses. The Arabidopsis F-box protein COI1 is required for plant defense and male fertility in JA signal pathway. To further investigate the regulatory role of COI1 in male fertility, we compared the proteomics profiles of Arabidopsis wild type （WT） flowers with coi1-1 mutant male-sterile flowers using two-dimensional difference gel electrophoresis coupled with matrix-assisted laser desoption/ionization-time-of-flight mass spectrometry. Sixteen proteins with potential function in specific biological processes such as metabolism processes and defense/stress responses were differentially expressed in WT and coi1-1 mutant flowers. Verification on a phi class glutathione transferase AtGSTF9, one out of these 16 identified proteins, revealed that the expression of AtGSTF9 was severely downregulated in flowers of coi1-1 mutant compared with that of WT. Further function analyses of these genes would provide new insights into the molecular basis of COil-regulated male fertility.

关键词： PROTEOMICS PLANT hormones PROTEINS ARABIDOPSIS INFLORESCENCES

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Identification and analysis of the inlet vortex of an axial-flow pump

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Journal of Hydrodynamics 2022年第2期34卷 234-243页

作者： wen-peng Zhang Li-jian Shi Fang-ping Tang Zhuang-zhuang Sun Ye Zhang College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou225009China

Axial-flow pumps are widely employed in urban flood control and drainage pumping *** inlet vortex is one factor that seriously threaten the safe,stable and efficient operation of axial-flow pump *** this paper,the vortex recognition performances of two vortex identification methods,the Q—criterion and Liutex methods,are compared based on an axial-flow pump,and the interactions between the impeller and vortex are explored.A flat plate vortex generator is installed in front of the impeller to continuously induce a stable *** numerical simulation results show that the Liutex method can not only simultaneously identify strong and weak vortices but also reduce the influence of shear force at the *** vortex and the impeller influence each *** the influence of rotating blades,the vortex changes from a low frequency to the blade frequency,and the vortex significantly changes the tangential velocity inside the *** accuracy of the numerical simulation results is verified by experiments on the external and internal characteristics.

关键词： Axial-flow pump inlet vortex vortex identification vortex generator numerical simulation experiment

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Local Compression Properties of Double-Stranded DNA Based on a Dynamic Simulation

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Chinese Physics Letters 2013年第12期30卷 186-190页

作者： LEI Xiao-Ling QI wen-peng FANG Hai-Ping Division of Interfacial Water Shanghai Institute of Applied PhysicsChinese Academy of SciencesP.O.Box 800-204Shanghai 201800

Using a simple sphere-tip compression system,the local radial mechanical properties of DNA are systematically studied by changing the tip *** the tip size decreases,the radial compression elastic properties under external loads become sensitive to the tip size and the local DNA conformation.A sudden force break appears in the compression-force curve when the tip size is less than or equal to 12 nm in *** analysis of the hydrogen bonds and the base stacking interaction shows that a local unwinding process *** the compression process,firstly the hydrogen bonds between complement base pairs are *** the compression accumulating,the local backbones in the compression center are unwound from the double helix conformation to a kind of parallel *** local unwinding behavior deduced by external loads is helpful to understand the biological process and is important to DNA-based nanomechanical devices.

关键词： winding base process

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Differential volatile organic compounds in royal jelly associated with different nectar plants

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Journal of Integrative Agriculture 2016年第5期15卷 1157-1165页

作者： ZHAO Ya-zhou LI Zhi-guo TIAN wen-li FANG Xiao-ming SU Song-kun peng wen-jun Institute of Apicultural Research Chinese Academy of Agricultural Sciences College of Bee Sciences Fujian Agriculture and Forestry University

The aim of this work was to distinguish volatile organic compound（VOC） profiles of royal jelly（RJ） from different nectar plants. Headspace solid-phase microextraction（HS-SPME） was used to extract VOCs from raw RJ harvested from 10 nectar plants in flowering seasons. Qualitative and semi-quantitative analysis of VOCs extracts were performed by gas chromatography-mass spectrometry（GC-MS）. Results showed that VOC profiles of RJ from the samples were rich in acid, ester and aldehyde compound classes, however, contents of them were differential, exemplified by the data from acetic acid, benzoic acid methyl ester, hexanoic acid and octanoic acid. As a conclusion, these four VOCs can be used for distinguishing RJ harvested in the seasons of different nectar plants.

关键词： royal jelly volatile organic compounds nectar plant headspace solid-phase microextraction gas chromatography-mass spectrometry

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Synthesis and Photovoltaic Properties of Non-fullerene Solution Processable Small Molecule Acceptors

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Chemical Research in Chinese Universities 2013年第3期29卷 596-599页

作者： LI Hui LIU Zhao-yang ZHANG Xiao-yu YAO Shi-yu wen Shan-peng TIAN wen-jing State Key Laboratory of Supramolecular Structure and Materials Jilin University Changchun 130012 P. R. China

Two non-fullerene small molecules, BT-C6 and BT-C12, based on the vinylene-linked benzothiadiazole-thiophene（BT） moiety flanked with 2-（3,5,5-trimethylcyclohex-2-en-l-ylidene）malononitrile have been synthesized and characterized by solution/thin film UV-Vis absorption, photoluminescence（PL）, and cyclic voltammetry（CV） measurements. The two molecules show intense absorption bands in a wide range from 300 nm to 700 nm and low optical band- gaps for BT-C6（1.60 eV） and for BT-C12（1.67 eV）. The lowest unoccupied molecular orbital（LUMO） levels of both the molecules are relatively higher than that of [6,6]-phenyl C61 butyric acid methyl ester（PCBM）, promising high open circuit voltage（Voc） for photovoltaic application. Bulk heterojunction（BHJ） solar cells with poly（3-hexylthiophene）（P3HT） as the electron donor and the two molecules as the acceptors were fabricated. Under 100 mW/cm2 AM 1.5 G illumination, the devices based on P3HT：BT-C6（1：1, mass ratio） show a power conversion efficiency（PCE） of 0.67%, a short-circuit current（Jsc） of 1.63 mA/cm2, an open circuit voltage（Vow） of 0.74 V, and a fill factor（FF） of 0.56.

关键词： Non-fullerene small molecule Electron acceptor Bulk heterojunction

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Analysis of Hot Tandem Rolling Force with Logarithmic Velocity Field and EA Yield Criterion

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Journal of Iron and Steel Research International 2014年第3期21卷 295-299页

作者： Jian-zhao CAO De-wen ZHAO Shun-hu ZHANG wen peng Shu-zong CHEN Dian-hua ZHANG State Key Laboratory of Rolling and Automation Northeastern University

In order to analyze the hot tandem roiling force, a new logarithmic velocity field is proposed. Using the field and linear EA （equal area） yield criterion, the plastic deformation power for plate rolling is analyzed, and the friction power is obtained based on the co-line vector inner product method. Then analytical solution of plate rolling power functional is obtained. Finally, by minimizing the power functional, the rolling torce and torque are received. Compared with those measured ones in hot tandem rolling on-line, the calculated rolling forces are in good agreement with the actual measured ones since the maximum error is less than 12~. Moreover, the effects of various rolling conditions such as thickness reduction, friction factor and shape factor, upon separating force, location of neutral an- gle, and stress state coefficient are discussed systematically.

关键词： hot tandem rolling rolling force logarithmic velocity field EA yield criterion analytical solution

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