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Effect of carbon fiber on calcium phosphate bone cement

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中国有色金属学会会刊：英文版 2004年第4期14卷 769-774页

作者：戴红莲王欣宇黄健闫玉华李世普 biomedical Materials and engineering Research center Wuhan University of Technology

The calcium phosphate cement (α-TCP/TTCP) was reinforced with oxidation-t reated carbon fibers. The effect of aspect ratio and content of carbon fiber on the compression strength and bending strength of the hardened body was discussed . The results show that the reinforcing effect is optimal as the aspect ratio is 375 and the additive amount is 0.3%(mass fraction). Under this condition,the c ompressive strength is increased by 55% (maximum 63.46 MPa),and the bending st rength is nearly increased by 100% (maximum 11.95 MPa),respectively. However,if the additive quantity and aspect ratio are too high,the effect of the carbon fibers is limited because it can not be dispersed uniformly in the hardened bod y. The biological evaluation indicates that the calcium phosphate cement reinfor ced by carbon fibers has good biocompatibility.

关键词：磷酸钙生物材料 α-TCP/TTCP 骨接合剂氧化处理碳纤维

Interleaving Gradient Magnetic Field Method for Diffusion Weighted Spectroscopy

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Chinese physics Letters 2008年第1期25卷 325-328页

作者：高嵩俎中良包尚联 Department of medical physics Health Science Center Peking University Beijing 100083 Beijing City Key Lab of medical physics and engineering School of Physics Peking University Beijing 100871

Diffusion-weighted magnetic resonance spectroscopy （DWS） has considerable potential in clinical and research applications. However, it is seldom implemented in conventional magnetic resonance imaging （MRI） scanners due to the strict hardware requirements. We propose an interleaving gradient magnetic field （IGMF） method based on point resolved spectroscopy （PRESS）. Four interlaced powerful diffusion sensitive gradient magnetic fields are positioned around the two π refocusing rf pulses in the PRESS sequence. This method utilizes the interval time in the PRESS pulse sequence, doubles the duration time of the diffusion sensitive gradient magnetic field and decreases the detrimental effect of the induced eddy current. The results of theoretical analysis and experimental observation demonstrate that the IGMF method is suitable for conventional MRI scanners.

关键词： pulsars x-ray spectra relativity and gravitation redshift

A new horizon for neuroscience:terahertz biotechnology in brain research

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Neural Regeneration Research 2025年第2期20卷 309-325页

作者： Zhengping Pu Yu Wu Zhongjie Zhu Hongwei Zhao Donghong Cui Shanghai Key Laboratory of Psychotic Disorders Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Department of Psychiatry Kangci Hospital of JiaxingTongxiangZhejiang ProvinceChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina Key Laboratory of Interfacial physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of ScienceShanghaiChina National Facility for Protein Science in Shanghai Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina

Terahertz biotechnology has been increasingly applied in various biomedical fields and has especially shown great potential for application in brain *** this article,we review the development of terahertz biotechnology and its applications in the field of *** evidence indicates promising prospects for the use of terahertz spectroscopy and terahertz imaging techniques in the diagnosis of amyloid disease,cerebrovascular disease,glioma,psychiatric disease,traumatic brain injury,and myelin *** vitro and animal experiments have also demonstrated the potential therapeutic value of terahertz technology in some neuropsychiatric *** the precise underlying mechanism of the interactions between terahertz electromagnetic waves and the biosystem is not yet fully understood,the research progress in this field shows great potential for biomedical noninvasive diagnostic and therapeutic ***,the biosafety of terahertz radiation requires further exploration regarding its two-sided efficacy in practical *** review demonstrates that terahertz biotechnology has the potential to be a promising method in the field of neuropsychiatry based on its unique advantages.

关键词： biological effect brain neuron neuropsychiatry neuroscience non-thermal effect terahertz imaging terahertz radiation terahertz spectroscopy terahertz technology

Biomechanical properties of soft tissues

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Science China(physics,Mechanics & Astronomy) 2003年第3期46卷 284-290页

作者：曾衍钧许传青杨坚徐小虎 medical School Shantou UniversityShantou 515031China Biomedical Engineering CenterBeijing Polytechnic UniversityBeijing 100022China biomedical engineering center Beijing Polytechnic UniversityBeijing 100022China medical School Shantou UniversityShantou 515031China

Viscoelasticity is the primary mechanical property of bio-soft tissues. It has been widely applied in basic research of biological tissues including cornea, lung, heart and blood vessels. Along with the development of tissue engineering research, the evaluation of soft tissue viscoelasticity is becoming more and more important. In this paper, using the Whittaker function, we give an approximate power series of the exponential integral E1(x) and the parameters c, ?1 and ?2 of the generalized relaxation function G(t) and generalized creep function J(t). With expanded skin as an example, the relationship between stress relaxation, creep and stress-strain finite deformation are studied.

关键词： bio-soft tissue, viscoelasiticity, creep, stress relaxation, stress-strain relationship.

Antibacterial mechanism and transcriptomic analysis of a nearinfrared triggered upconversion nanoparticles@AgBiS2 for synergetic bacteria-infected therapy

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Nano Research 2022年第10期15卷 9298-9308页

作者： Shi Chen Zhaoyou Chu Limian Cao Lingling Xu Qianqian Jin Nian Liu Benjin Chen Ming Fang Wanni Wang Haisheng Qian Min Shao Department of Critical Care Medicine The First Affiliated Hospital of Anhui Medical UniversityHefei 230032China School of biomedical engineering Research and Engineering Center of Biomedical MaterialsAnhui Provincial Institute of Translational MedicineAnhui Medical UniversityHefei 230032China

Methicillin-resistant Staphylococcus aureus(MRSA)has become a rising clinical problem as its occurrence has increased due to the overuse and misuse of *** this work,upconversion nanoparticles@AgBiS2 core–shell were produced with enhanced photothermal transformation efficiency and ability to produce reactive oxygen species for synergistic photodynamic photothermal and photodynamic antibacterial *** nanoparticles exhibit good antibacterial effects in vitro and satisfactory therapeutic performance on healing MRSA-infected wounds in vivo ***-sequencing technique has been used to investigate and reveal that photothermal–photodynamic therapy using the nanoparticles can interfere with metabolic processes such as galactose metabolism in MRSA bacteria,destroy the transport system on the surface of MRSA,and affect quorum sensing to hinder the formation of biofilms to achieve effective antibacterial *** was demonstrated that this work presents an alternative near-infrared photoactive multimodal nanostructure for antibacterial applications.

关键词： photothermal therapy photodynamic therapy anti-methicillin-resistant Staphylococcus aureus(MRSA) RNA-sequencing transcriptomic analysis

The low-latitude sodium layer:comparative data from lidar observations at Hainan,China and São Paulo,Brazil

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Earth and Planetary physics 2025年第1期9卷 39-53页

作者： Fang Wu Jing Jiao GuoTao Yang LiFang Du ZhengKuan Liu HaoRan Zheng JiXin Guo ShaoHua Gong YaJun Zhu State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Hainan National Field Science Observation and Research Observatory for Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China China-Brazil Joint Laboratory for Space Weather NSSC/INPESão Josédos Campos 12227-010Brazil School of physics and Electronics engineering Hainan Normal UniversityHaikou 571158China

Physical and chemical processes observed in the mesosphere and thermosphere above the Earth’s low latitudes are complex and highly interrelated to activity in the low-latitude *** sodium detected by lidar can yield clues to dynamic and chemical processes in these spatial layers above the Earth’s *** paper is based on sodium layer data collected at two low-latitude stations,one in the northern hemisphere and one in the *** low-latitude sodium layer exhibits conspicuous seasonal variations in shape,density,and altitude;these variations are similar between Earth’s hemispheres:sodium layer density at both stations reaches its seasonal maximum in autumn and minimum in ***,maximal Na density over Brazil is greater than that over *** variations of Na density above the two low-latitude stations are also similar;at both,maxima are observed before *** variations of the Na layer over Brazil that differ from those observed in the northern hemisphere may be related to the South Atlantic Magnetic Anomaly(SAMA)or fountain *** suggest that low-latitude Na layer data may provide useful additional evidence that could significantly improve the low-latitude part of the WACCM-Na model.

关键词： metallic sodium layer seasonal variation nocturnal variation lidar

Tunable ponderomotive squeezing in an optomechanical system with two coupled resonators

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Chinese physics B 2021年第2期30卷 190-195页

作者： Qin Wu School of biomedical engineering Guangdong Medical UniversityDongguan 523808China

We investigate properties of the ponderomotive squeezing in an optomechanical system with two coupled resonators,where the tunable two-mode squeezing spectrum can be observed from the output *** is realized that the squeezing orientation can be controlled by the detuning between the left cavity and pump ***,both cavity decay and environment temperature play a positive role in generating better pondermotive squeezing *** squeezing spectra with a wide squeezing frequency range can be obtained by appropriate choice of parameters present in our optomechanical system.

关键词： ponderomotive squeezing light optomechanical system coupled resonators

QCD Sum Rules Study of X(4350)

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Communications in Theoretical physics 2014年第4期61卷 501-505页

作者：莫增崔春雨刘永录黄明球 Department of physics School of Biomedical EngineeringThird Military Medical University College of Science National University of Defense Technology

The QCD sum rule approach is used to analyze the nature of the recently observed new resonance X （4350）, which is assumed to be a diquark-antidiquark state [cs][cs] with jPC = 1-＋. The interpolating current representing this state is proposed. In the calculation, contributions of operators up to dimension six are included in the operator product expansion （OPE）, as well as terms which are linear in the strange quark mass ms. We find ml-＋ = （4.82 ~ 0.19） GeV, which is not compatible with the X（4350） structure as a 1-＋ tetraquark state. Finally, we also discuss the difference of a four-quark state＇s mass whether the state＇s interpolating current has a definite charge conjugation.

关键词： X(4350) exotic-charmonium

Development of A Surface Acoustic Wave LB Membrane Immunity Sensor

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Journal of Huazhong University of Science and Technology(medical Sciences) 2000年第1期20卷 20-22页

作者：沈杰苏娜任恕周先明 Department of biomedical engineering Center of Experimental Medicine Tongji Medical University Wuhan 430030

Summary: A new kind of biosensor for immunology was developed by ultrasonic technique and LB membrane. A double delay-line resonator was made by using ST-cut quartz crystal with working frequency of 149. 7 MHz. Then a layer of LB membrane was covered on it. When anti-IgM anti- body of various concentrations was added to it, the sensor can be used to detect IgM antigen. The biosensor was highly sensitive, small and light. The experimental results showed that the working frequency change of the sensor was proportional to the concentration of antibody with its dilution ratio between 1: 10000 and 1: 100. It was also first observed that the frequency curve of the sen- sor resulting from the reaction of IgM antigen and antibody undulated in the experiment.

关键词： sensor immunology surface acoustic wave LB membrane