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| 1 | Reliable transmission of consultative committee for space data systems file delivery protocol in deep space communication显示文摘In consultative committee for space data systems(CCSDS) file delivery protocol(CFDP) recommendation of reliable transmission,there are no detail transmission procedure and delay calculation of prompted negative acknowledge and asynchronous negative acknowledge models.CFDP is designed to provide data and storage management,story and forward,custody transfer and reliable end-to-end delivery over deep space characterized by huge latency,intermittent link,asymmetric bandwidth and big bit error rate(BER).Four reliable transmission models are analyzed and an expected file-delivery time is calculated with different trans-mission rates,numbers and sizes of packet data units,BERs and frequencies of external events,etc.By comparison of four CFDP models,the requirement of BER for typical missions in deep space is obtained and rules of choosing CFDP models under different uplink state informations are given,which provides references for protocol models selection,utilization and modification. | Hui Li Hao Luo Faxin Yu Zheming Lu | 2010 | Journal of Systems Engineering and Electronics2010，21，3： | 7 |
| 2 | Analysis of the electromechanical behavior of ferroelectric ceramics based on a nonlinear finite element model显示文摘A nonlinear finite element (FE) model based on domain switching was proposed to study the electromechanical behavior of ferroelectric ceramics. The incremental FE formulation was improved to avoid any calculation instability. The problems of mesh sensitivity and convergence, and the efficiency of the proposed nonlinear FE technique have been assessed to illustrate the versatility and potential accuracy of the said technique. The nonlinear electromechanical behavior, such as the hysteresis loops and butterfly curves,of ferroelectric ceramics subjected to both a uniform electric field and a point electric potential has been studied numerically. The results obtained are in good agreement with those of the corresponding theoretical and experimental analyses.Furthermore, the electromechanical coupling fields near (a) the boundary of a circular hole, (b) the boundary of an elliptic hole and (c) the tip of a crack, have been analyzed using the proposed nonlinear finite element method (FEM). The proposed nonlinear electromechanically coupled FEM is useful for the analysis of domain switching, deformation and fracture of ferroelectric ceramics. | Daining Fang Faxin Li A. K. Soh Tieqi Liu | 2005 | Acta Mechanica Sinica2005，21，3： | 3 |
| 3 | Experimental investigation of Z-pinch radiation source for indirect drive inertial confinement fusion显示文摘Z-pinch dynamic hohlraums(ZPDHs)could potentially be used to drive inertial confinement fusion targets.Double-or multishell capsules using the technique of volume ignition could exploit the advantages of ZPDHs while tolerating their radiation asymmetry,which would be unacceptable for a central ignition target.In this paper,we review research on Z-pinch implosions and ZPDHs for indirect drive targets at the Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics.The characteristics of double-shell targets and the associated technical requirements are analyzed through a one-dimensional computer code developed from MULTI-IFE.Some key issues regarding the establishment of suitable sources for dynamic hohlraums are introduced,such as soft X-ray power optimization,novel methods for plasma profile modulation,and the use of thin-shell liner implosions to inhibit the generation of prior-stagnated plasma.Finally,shock propagation and radiation characteristics in a ZPDH are presented and discussed,together with some plans for future work. | Zhenghong Li Zhen Wang Rongkun Xu Jianlun Yang Fan Ye Yanyun Chu Zeping Xu Faxin Chen Shijian Meng Jianmin Qi Qinyuan Hu Yi Qin Jiaming Ning Zhanchang Huang Linbo Li Shuqing Jiang | 2019 | Matter and Radiation at Extremes2019，4，4： | 1 |
| 4 | Visualizing experimental investigation on gas-liquid replacements in a microcleat model using the reconstruction method显示文摘Cleats are the main channels for fluid transport in coal reservoirs.However,the microscale flow characteristics of both gas and water phases in primary cleats have not been fully studied as yet.Accordingly,the local morphological features of the cleat were determined using image processing technology and a transparent cleat structure model was constructed by microfluidic lithography using the multiphase fluid visualization test system.Besides,the effect of microchannel tortuosity characteristics on two‐phase flow was analyzed in this study.The results are as follows:(1)The local width of the original cleat structure of coal was strongly nonhomogeneous.The cleats showed contraction and expansion in the horizontal direction and undulating characteristics in the vertical direction.(2)The transient flow velocity fluctuated due to the structural characteristics of the primary cleat.The water‐driven gas interface showed concave and convex instability during flow,whereas the gas‐driven water interface presented a relatively stable concave surface.(3)The meniscus advanced in a symmetrical pattern in the flat channel,and the flow stagnated due to the influence of undulation points in a partially curved channel.The flow would continue only when the meniscus surface bypassed the stagnation point and reached a new equilibrium position.(4)Enhanced shearing at the gas-liquid interface increased the gas‐injection pressure,which in turn increased residual liquids in wall grooves and liquid films on the wall surface. | Shaojie Chen Jicheng Zhang Dawei Yin Faxin Li Jialin Lu Peiyang Zhu | 2023 | Deep Underground Science and Engineering2023，2，3： | 0 |
| 5 | Development of an Omni-Directional Shear Horizontal Wave Transducer Based on a Radially Poled Piezoelec trie Ring显示文摘For the inspection of large plate-like structures,the omni-directional guided wave transducer-based system has been regarded as an effective tool since only a few transducers are required to cover the entire inspection area without blind zones.In comparison with Lamb waves,the shear horizontal(SH)wave is more promising because its fundamental mode is non-dispersive.In this work,we proposed an omni-directional SH wave piezoelec trie t ransducer(OSH-PT)based on a radially poled d24-mode PZT ring.Eoth the finite element simulations and experiments were carried out to demonstrate its performance in generating and receiving SH°wave.Results showed that the radially poled OSH-PT could generate single-mode SHo wave and receive SHo wave only over a wide frequency range from 70 to 200 kHz.The obtained signal-to-noise ratio can reach up to 26 dB in generation and 24 dB in reception.The omni-directivity of this OSH-PT is also very good with the deviation only about 6%in both generation and reception of SHo wave.Considering its easy fabrication,low cost and superior performances,this proposed OSH-PT may promote the applications of SHo wave-based inspection in structural health monitoring and nondestructive testing. | Qiang Huan Mingtong Chen Ai-Kah Soh Faxin Li | 2019 | Acta Mechanica Solida Sinica2019，32，1： | 0 |
| 6 | Vibration analysis of atomic force microscope cantilevers in contact resonance force microscopy using Timoshenko beam model显示文摘Timoshenko beam model is employed to investigate the vibration of atomic force microscope(AFM)cantilevers in contact resonance force microscopy(CRFM).Characteristic equation with both vertical and lateral tip-sample contact is derived.The contact resonance frequencies(CRFs)obtained by the Timoshenko model are compared with those by the Euler-Bernoulli model.A method is proposed to correct the wave number obtained by the Euler-Bernoulli model.The forced vibration is compared between the two models.Results reveal that the Timoshenko model is superior to the Euler-Bernoulli model in predicting the vibration characteristics for cantilevers’higher eigenmodes. | Xilong Wen,Pengfei Li,Faxin | 2017 | Acta Mechanica Solida Sinica2017，30，5： | 0 |
| 7 | A unidirectional SH wave transducer based on phase-controlled antiparallel thickness-shear(d15)piezoelectric strips显示文摘In recent years,shear horizontal(SH)waves are being paid more and more attention to in structural health monitoring as it has only one displacement component.In this paper,a unidirectional SH wave transducer based on phase-controlled antiparallel thickness-shear(d15)piezoelectric strips(APS)is proposed.Here two pairs of identical APS were used each of which is a bidirectional SH wave transducer.By setting the interval between the two pairs of APS as 1/4 wavelength and the excitation delay between them as 1/4 period of the central operating frequency,unidirectional SH waves can be excited.Both finite element simulations and experiments were performed to validate the proposed design.Results show that SH0 waves were successfully excited only along one direction and those along the unwanted directions were suppressed very well.The proposed unidirectional SH wave transducer is very helpful to study the fundamentals and applications of SH waves. | Mingtong Chen Qiang Huan Faxin Li | 2020 | Theoretical & Applied Mechanics Letters2020，10，5： | 0 |
| 8 | Mutation analysis of KCNQ1, KCNH2, SCN5A, KCNE1 and KCNE2 genes in Chinese patients with long QT syndrome显示文摘Long QT syndrome(LQTS)is the prototype of the cardiac ion channelopathies,which cause syncope and sudden death.Inherited LQTS is represented by the autosomal dominant Romano-ward syndrome(RWS),which is not accompanied by congenital deafness,and the autosomal recessive Jervell and Lange-Nielsen syndrome(JLNS),which is accompanied by congenital deafness.The LQTS-causing mutations have been reported in patients and families from Europe,North America and Japan.Few genetic studies have been carried out in families with JLNS from China.This study investigates the molecular pathology in four families with LQTS(including a family with JLNS)in the Chinese population.Polymerase chain reaction and DNA sequencing were used to screen for KCNQ1,KCNH2,KCNE1,KCNE2 and SCN5A mutation.A missense mutation G314S in an RWS family was identified,and a single nucleotide polymorphism(SNP)G643S was indentified in the KCNQ1 of the JLNS family.In this JLNS family,another heterozygous novel mutation in exon 2a was found in KCNQ1 of the patients.Our data provide useful information for the identification of polymorphisms and mutations related to LQTS and the Brugada Syndrome(BS)in Chinese populations. | DU Rong TIAN Li YUAN Guohui LI Jin REN Faxin GUI Le LI Wei ZHANG Shouyan KANG Cailian YANG Junguo | 2007 | Frontiers of Medicine2007，1，3： | 0 |
| 9 | An energy-consistent fracture model for ferroelectrics显示文摘The fracture behavior of ferroelectrics has been intensively studied in recent decades, though currently a widely accepted fracture mechanism is still lacking. In this work, enlightened by previous experimental observations that crack propagation in ferroelectrics is always accompanied by domain switching, we propose a micromechanical model in which both crack propagation and domain switching are controlled by energy-based criteria. Both electric energy and mechanical energy can induce domain switching,while only mechanical energy can drive crack propagation.Furthermore, constrained domain switching is considered in this model, leading to the gradient domain switching zone near the crack tip. Analysis results show that stressinduced ferroelastic switching always has a toughening effect as the mechanical energy release rate serves as the driving force for both fracture and domain switching. In comparison, the electric-field-induced switching may have either a toughening or detoughening effect. The proposed model can qualitatively agree with the existing experimental results. | Hongchen Miao Faxin Li | 2017 | Acta Mechanica Sinica2017，33，1： | 0 |
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