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Anticorrosive and antibacterial smart integrated strategy for biomedical magnesium

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Journal of Magnesium and Alloys 2023年第8期11卷 2789-2800页

作者： JianLiang Zhao HanRui Cui ZeYu Gao YanZe Bi ZhenZhen Dong Yan Li caiqi wang School of ChemicalScience University of Chinese Academy of SciencesBeijing100049China School of Materials Science and Engineering Beihang UniversityBeijing 100083China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100191China

Biomedical magnesium is an ideal material for hard tissue repair and ***,its rapid degradation and infection after implantation significantly hindersclinical *** overcome these two critical drawbacks,we describe an integrated strategybased on the changes in pH and Mg^(2+)triggered by *** system can simultaneously offer anticorrosion and antibacterial ***,nanoengineered peptide-grafted hyperbranched polymers(NPGHPs)with excellent antibacterial activity were introduced to sodium alginate(SA)to construct a sensitive NPGHPs/SA *** swelling degree,responsiveness,and antibacterial activity were then investigated,indicating that the system can perform dual stimulation of pH and Mg^(2+)with controllable antimicrobial ***,an intelligent platform was constructed by coating hydrogels on magnesium with polydopamine as the transition *** alkaline environment generated by the corrosion of magnesium reduces the swelling degree of the coatingso that the liquid is unfavorable for contacting the substrate,thus exhibiting superior corrosion *** testing shows that the material can effectively fight against bacteria,while hemolytic and cytotoxicity testing suggest that it is highly ***,this work realizes the smart integration of anticorrosion and antibacterial properties of biomedical magnesium,thereby providing broader prospects for the use of magnesium.

关键词： Biomedical magnesium Anticorrosion Antibacterial Intelligent Nanoengineered peptide-grafted hyperbranched polymers

Multi-Rate Kalman Filter for UAV Attitude Estimation Based on Adaptive Disturbance Model

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Multi-Rate Kalman Filter for UAV Attitude Estimation Based o...

第43届中国控制会议

作者： Weibin Feng caiqi wang Shiqian Wu Qi Wu Hongsen Zhu School of Information Science and Engineering Wuhan University of Science and Technology School of Software and Internet of things Engineering Jiangxi University of Finance and Economics

Attitude estimation is a pivotal issue in unmanned aerial vehicle(UAV) control *** to its high dynamics,the current attitude estimation methods suffer from drift and instability in dynamic *** this paper,multi-rate Kalman filter is proposed to estimate the attitude i.e.,roll and pitch of UAVs using an Inertial Measurement Unit(IMU) consisting of a threeaxis gyroscope and accelerometer,in conjunction with an optical flow *** mitigate the effects of external acceleration disturbances,a first-order Gauss-Markov process is employed to model the disturbances and combines it with a Kalman filter to eliminate the disturbances.A sigmoid function is introduced to map the relationship between the magnitude of the external disturbance and the model coefficient to achieve adaptive adjustment of the model ***,the differential information of the optical flow velocity is used as an additional observation,and a multi-rate Kalman filter is presented based on the different update frequencies of the observation *** estimated gravity acceleration is then used to calculate the attitude via the fast complementary filtering(FCF) *** results on STM32 microcontroller show that the proposed method can effectively improve the accuracy of attitude estimation and anti-interference ability of UAVs in motion state.

关键词： Attitude estimation external acceleration disturbances multi-rate Kalman filter IMU optical flow

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恶性实体肿瘤与复发性静脉血栓的研究进展

肿瘤研究与临床 2020年第9期32卷 666-668页

作者：王彩旗段朝霞山西医科大学研究生院太原030001 山西医科大学附属人民医院血液科太原030012

静脉血栓形成是仅次于肿瘤本身引起患者死亡的主要因素之一。临床上即使进行了抗凝措施干预,我们仍可以观测到肿瘤患者静脉血栓的多次形成。文章将通过探索肿瘤患者静脉血栓复发的预测因子及危险因素,探讨如何干预肿瘤合并静脉血栓形成... 详细信息

静脉血栓形成是仅次于肿瘤本身引起患者死亡的主要因素之一。临床上即使进行了抗凝措施干预,我们仍可以观测到肿瘤患者静脉血栓的多次形成。文章将通过探索肿瘤患者静脉血栓复发的预测因子及危险因素,探讨如何干预肿瘤合并静脉血栓形成的患者,预防静脉血栓复发。

关键词：恶性肿瘤静脉血栓栓塞风险管理

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圆明园琉璃瓦片状云母氧化铁的形成机理

中国科学院大学学报（中英文） 2018年第4期35卷 492-499页

作者：窦金海王彩旗崔剑锋金和天张中华中国科学院大学化学科学学院北京100049 北京大学考古文博学院北京100871 北京市文物研究所北京100009

使用光学显微镜、EDXRF、SEM、XPS和XRD对圆明园出土的部分黄色琉璃瓦釉黄中泛红现象进行分析,以研究琉璃瓦的变色机理。分析表明:琉璃瓦的釉层属于一种铅硅系玻璃,釉层呈现黄中泛红现象是由于红色区域和黄色区域中Fe存在形式不同所致,... 详细信息

使用光学显微镜、EDXRF、SEM、XPS和XRD对圆明园出土的部分黄色琉璃瓦釉黄中泛红现象进行分析,以研究琉璃瓦的变色机理。分析表明:琉璃瓦的釉层属于一种铅硅系玻璃,釉层呈现黄中泛红现象是由于红色区域和黄色区域中Fe存在形式不同所致,釉层红色区域中Fe主要是以α-Fe_2O_3晶体形式存在,黄色区域中Fe是以Fe^(3+)与Fe^(2+)的形式存在。这种现象产生的本质是由于黄色区域中的Fe^(2+)在高温条件下被O_2氧化为Fe^(3+),然而高温导致釉层流失,进而导致釉层中的Fe^(3+)析出富聚为六角片状的α-Fe_2O_3晶体颗粒所致。α-Fe_2O_3显红色又被称为云母氧化铁红,是非常重要的防锈防腐涂料以及珠光颜料。

关键词：圆明园琉璃瓦颜色变化 α-Fe2O3

Chiral Assembly of Achiral Pseudoisocyanine with D- and L-Pnenylalnine

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Chiral Assembly of Achiral Pseudoisocyanine with D- and L-Pn...

Effect of Graphite Nodule Diameter on Water Embrittlement of Austempered Ductile Iron

2008年分子手性起源与识别学术研讨会

作者： Lixi Zeng~1 Yujian He~(1*) Zhifeng Dai~1 Jian wang~1 caiqi wang~1 Yonggang Yang~2 ~1 College of Chemistry and Chemical Engineering,Graduate University of Chinese Academy of Sciences,Beijing 100049,P.R.China ~2 Key Laboratory of Organic Synthesis of Jiangsu Province,College of Chemistry and Chemical Engineering,Suzhou (Soochow) University,Suzhou,Jiangsu 215123,P.R. China

＜正＞Supramolecular chirality and molecular self-assembly are important and interesting phenomenon in living and non-living *** this paper, supramolecular chirality of J-aggregate of achiral pseudoisocyanine （PIC） was successfully induced by D- or L- phenylalanine （Phe） in NaCl *** chiral J-aggregates show a characteristic,induced circular dichroism （ICD） in visible region of J-band chromophore which depends on the absolute configuration,side group and concentration ofα-amino acids,as well as *** atomic force microscopy images indicated that the J-aggregates exist in large bundles of entangled nanofibers, the observed ICD may result from the macroscopic helical arrangement of the assemblies.

关键词： supramolecular chiralit pseudoisocyanine J-aggregate induced circular dichroism (ICD) α-amino acid

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Journal of Iron and Steel Research International 2005年第3期12卷 40-45页

作者： caiqi-zhou WEIBo-kang TANAKAYuichi HuazhongUniversityofScienceandTechnology Wuhan430074China MuroranInstituteofTechnology Muroran050-8585Japan

Effects of graphite nodule diameter on the water embrittlement of austempered ductile iron (ADI) is studied. The water embrittlement mechanism is discussed. Due to water adhesion, local embrittlement occurs on the surface of ADI specimen, resulting in early fracture and significant reduction in tensile strength and elongation. The water embrittlement is the cracking of stress induced martensite formed during tensile deformation caused by hydrogen diffusion decomposed from water and as a result tensile strength and elongation of ADI are remarkably reduced. The segregation of alloying elements in ductile iron is weakened with decreasing nodule diameter, reducing the residual austenite in grain boundaries, then decreasing the amount of stress induced martensite during tensile plastic deformation and finally restraining ADI water embrittlement.

关键词： austempered ductile iron water embritttlement graphite nodule diameter tensile property

Multiple Hydrogen Bonds Promoted ESIPT and AlE-active Chiral Salic-ylaldehyde Hydrazide

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Chinese Journal of Chemistry 2018年第8期36卷 698-707页

作者： Man wang caiqi Cheng Jintong Song Jun wang Xiangge Zhou Haifeng Xiang Jin Liu College of Chemistry Sichuan University Chengdu Sichuan 610041 China State Key Laboratory of Oral Diseases Department of Orthodontics West China Hospital of Stomatology Sichuan University Chendu Sichuan 610064 China Laboratory of Stem Cell Biology West China Hospital Sichuan University Chengdu Sichuan 610064 China

The simpler, the better! A series of simple and highly fluorescent salicylaldehyde hydrazide molecules （41 samples） have been designed and prepared. Even though these soft materials contain a very small π-conjugated system, they can go through multiple intramolecular and intermolecular hydrogen bonds promoted excited-state intramolecular proton-transfer （ESIPT） to display strong blue, green, yellow, and orange aggregation-induced emission （ALE） with large Stokes shifts （up to 184 nm） and high fluorescence quantum yields （φ up to 0.20）. Unusual mechanochromic fluorescence en- hancements are also found in some solid samples. Through coordination, hydrogen and halogen bonds, these flexible molecules can be used as Mg2＋（φ up to 0.46） probes, universal anion （φ up to 0.14） and unprotected amino acids （φ up to 0.16） probes, and chiral diamine （enantiomeric selectivity and φ up to 0.36 and 0.062, respectively） receptors. Combining their advantages of AlE and biocompatibility, these low cytotoxic dyes have potential application in living cell imaging. Furthermore, the effects of different functional groups on the molecule arrangement, ESIPT, AlE, probe, and chiral recognition properties are also examined, which provide a simple and bright paradigm for the design of multiple-stimuli-responsive smart materials.

关键词： promoted excited-state intramolecular proton-transfer (ESIPT) aggregation-induced emission anion hosts/probes amino acids probes chiral diamine

羟丙基纤维素接枝聚己内酯两亲性共聚物性能的研究

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纤维素科学与技术 2002年第1期10卷 40-44页

作者：王彩旗董宇平吴彤谭惠民北京理工大学化工与材料学院北京100081

通过TEM和WAXD对两亲性接枝共聚物羟丙基纤维素接枝聚己内酯(HPC-g-PCL)的微观相分离和结晶性能进行了研究。对微观相分离和结晶性能对力学性能的影响进行了探讨。结果表明,在投料时CL含量少于50%,接枝共聚物中PCL段以微区的形式存在,... 详细信息

通过TEM和WAXD对两亲性接枝共聚物羟丙基纤维素接枝聚己内酯(HPC-g-PCL)的微观相分离和结晶性能进行了研究。对微观相分离和结晶性能对力学性能的影响进行了探讨。结果表明,在投料时CL含量少于50%,接枝共聚物中PCL段以微区的形式存在,难以形成晶区,使得强度和弹性模量显著下降,而断裂伸长率明显地增加;当CL投料量大于50%,接枝共聚物的微相分离表现为HPC以微区的形态存在,PCL段可以形成结晶,且随含量的增加,结晶能力逐渐增强,接枝共聚物的强度增加,而断裂伸长率明显地下降。同时对接枝共聚物的吸水性能的测试结果表明,水溶性的HPC接枝PCL后,不能再溶于水,但具有一定的吸水能力,且PCL段含量越多,吸水能力越弱。

关键词：两亲性接枝共聚物羟丙基纤维素接枝聚己内酯结晶性能力学性能

Influence Mechanism of the Trabecular and Chamfer Radii on the Three-point Bending Properties of Trabecular Beetle Elytron Plates

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Journal of Bionic Engineering 2021年第2期18卷 409-418页

作者： Xiaoming Zhang Xindi Yu Jinxiang Chen caiqi Zhao Sujun Guan Yaqin Fu School of Civil Engineering Southeast UniversityNanjing 211189China Department of Physics Tokyo University of ScienceTokyo 1628601Japan College of Materials and Textiles Zhejiang Sci-Tech UniversityHangzhou 310018China

To improve the mechanical properties of Trabecular Beetle Elytron Plates(TBEPs,a type of biomimetic sandwich structure inspired by the beetle elytron)under transverse loads,three-point bending tests are performed to investigate the influence of the trabecular and chamfer radii of the core structure on the mechanical performance of TBEPs manufactured by 3D printing *** results show that the three-point bending performance of TBEPs can be improved by setting reasonable trabecular and chamfer radii;however,excessive increases in these radii can cause a decline in the mechanical *** the reason,these two structural parameters can enhance the deformation stiffness of the whole structure and the connection property between the core and skin,which is also the mechanical reason why Prosopocoilus inclinatus beetle elytra have thick,short trabeculae with a large chamfer ***,when these radii increase to a certain extent,the cracks are ultimately controlled between two adjacent trabeculae,and the failure of the plate is determined by the skin rather than the core ***,this study suggests a reasonable range for trabecular and chamfer radii,and indicates that TBEPs are better suited for engineering applications that have high compression requirements and general bending requirements.

关键词： beetle elytron bio-inspired structure sandwich structure honeycomb plate trabeculae bending properties