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Some selected topics on structural safety

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Acta Mechanica Sinica 2023年第4期39卷 1-2页

作者： juan ma Wei Gao Research Centre of Applied Mechanics School of Mechano-Electronic EngineeringXidian UniversityXi’an710071China Centre for Infrastructure Engineering and Safety(CIES) School of Civil and Environmental EngineeringThe University of New South WalesSydneyNSW2052Australia

Structural safety and reliability play an extremely important role in modern life and have been one of the hot research topics in the past *** to the complexity of the problem in nature,extensive studies on structural safety are still highly *** thematic issue of Acta Mechanica Sinica on structural safety contains nine papers addressing a wide variety of research areas ranging from the development of the fundamental numerical method for structural analysis to the reliability assessment of structures concerned by different disciplines.

关键词： structural concerned reliability

Control of stochastic spike motion in an excitable system via recycled noise

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Science China Chemistry 2011年第9期54卷 1504-1509页

作者： ma juan GAO QingYu College of Chemical Engineering China University of Mining and Technology Xuzhou 221008 China

The control effect of recycled noise,generated by the superposition of a primary Gaussian noise source and a secondary source with a constant delay,has been studied in an excitable FitzHugh-Nagumo *** mainly focus on the performance of noise-induced spike and coherence resonance in a parameter region sub-threshold to supercritical Hopf *** fixed noise intensity,simulations show that the coherence(quantitatively measured by R,which is defined as the mean value of the spike interval time T normalized to its mean square root) and the emission velocity of the noise-induced spikes exhibit damped oscillations with the variation of delay time,demonstrating a new kind of multi-resonance ***,the optimal delay times for resonance and the fast emission velocity are related to the inherent frequency of the *** seems that there are some synchronization effects between the dynamic character of the system and the delay time of recycled *** results give clear information about how one can control the coherence and emission velocity of the noise-induced spike in a rather effective way,by deliberately adjusting the delay time and the fraction of the secondary noise.

关键词： stochastic spike excitable recycled noise coherent resonance

Superfluid Fermi Gases in a Rotating Anharmonic Trap

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Communications in Theoretical Physics 2011年第3期55卷 434-440页

作者： ma juan XUE Ju-Kui College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

The quadrupole mode frequency, the monopole mode frequency, and the critical rotational frequency for stirring a single vortex nucleation along the BEC-BCS crossover are obtained. The results show that, in a rotating anisotropic anharmonic trap, the quadrupole mode frequency and the critical rotational frequency for stirring a single vortex nucleation are modified significantly when the system crosses from the BEC side to the BCS side： the anisotropy of the trap induces a downshiff of the quadrupole mode frequency and the critical rotational frequency and helps the vortex formation in the system, while an anharmonic trap induces an upshift of the quadrupole mode frequency and the critical rotational frequency and suppresses the vortex formation in the system.

关键词： superfluid Fermi gases anisotropic anharmonic trap vortex

Achieving nitritation at low temperatures using free ammonia inhibition on Nitrobacter and real-time control in an SBR treating landfill leachate

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Journal of Environmental Sciences 2015年第4期27卷 157-163页

作者： Hongwei Sun Yongzhen Peng Shuying Wang juan ma Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology School of Environmental and Municipal Engineering Lanzhou Jiaotong University

Free ammonia（FA） inhibition on nitrite-oxidized bacteria（NOB） and real-time control are used to achieve nitrogen removal from landfill leachate via nitrite pathway at low temperatures in sequencing batch reactor. The inhibition of FA on NOB activity during the aerobic period was prolonged using real-time control. The degree of nitrite accumulation was monitored along with variations of the ammonia-oxidizing bacteria and NOB population using fluorescence in situ hybridization techniques. It is demonstrated that the end-point of ammonia oxidization is detected from the on-line measured dissolved oxygen,oxidization–reduction potential, and p H signals, which could avoid the loss the FA inhibition on NOB caused by excess aeration. At low temperature（13.0–17.6°C）, the level of nitrite pathway rapidly increased from 19.8% to 90%, suggesting that nitritation was successfully started up at low temperature by applying syntrophic association of the FA inhibition and real-time control, and then this high level of nitrite pathway was stably maintained for as long as 233 days. Mechanism analysis shows that the establishment of nitritation was primarily the result of predominant ammonia-oxidizing bacteria developed in the nitrifying bacteria population compared to NOB. This was mainly due to a gradual reduction of nitrite amount that is available to provide energy for the growth of NOB,eventually leading to the elimination of NOB from the bacterial clusters in sequencing batch reactor sludge system.

关键词： Landfill leachate Nitritation Low temperature Free ammonia Inhibition AOB and NOB

Denitrifying phosphorus removal in a step-feed CAST with alternating anoxic-oxic operational strategy

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Journal of Environmental Sciences 2009年第9期21卷 1169-1174页

作者： ma juan PENG Yongzhen WANG Shuying WANG Li LIU Yangt ma Ningpin Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China. China Water Holdings Private Limited 28 Kaki Bukit Crescent Kaki Bukit Techpark I S416259 416259 Singpore.

A bench-scale cyclic activated sludge technology （CAST） was operated to study the biological phosphorus removal performance and a series of batch tests was carried out to demonstrate the accumulation of denitrifying polyphosphate-accumulating organisms （DNPAOs） in CAST system. Under all operating conditions, step-feed CAST with enough carbon sources in influent had the highest nitrogen and phosphorus removal efficiency as well as good sludge settling performance. The average removal rate of COD, NH4^＋-N, PO4^3--P and total nitrogen （TN） was 88.2%, 98.7%, 97.5% and 92.1%, respectively. The average sludge volume index （SVI） was 133 mL/g. The optimum anaerobic/aerobic/anoxic （AOA） conditions for the cultivation of DNPAOs could be achieved by alternating anoxic/oxic operational strategy, thus a significant denitrifying phosphorus removal occurred in step-feed CAST. The denitrification of NO^x--N completed quickly due to step-feed operation and enough carbon sources, which could enhance phosphorus release and further phosphorus uptake capability of the system. Batch tests also proved that polyphosphate-accumulating organisms （PAOs） in the step-feed process had strong denitrifying phosphorus removal capacity. Both nitrate and nitrite could be used as electron acceptors in denitrifying phosphorus removal. Low COD supply with step-feed operation strategy would favor DNPAOs accumulation.

关键词： cyclic activated sludge technology biological phosphorus removal denitrifying polyphosphate-accumulating organisms

Antiplatelet Effect of Active Components Derived from Chinese Herbal Medicine

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Chinese Journal of Integrative Medicine 2018年第8期24卷 632-640页

作者： ZHANG Ying ma Xiao-juan SHI Da-zhuo Graduate School Beijing University of Chinese Medicine Cardiovascular Diseases Center Xiyuan HospitalChina Academy of Chinese Medical Sciences China Heart Institute of Chinese Medicine China Academy of Chinese Medical Sciences

Atherothrombosis is the major cause of acute coronary syndromes and cardiovascular *** participate in the processes of forming and extending atherosclerotic ***,antiplatelet therapy is a milestone in the primary and second prevention of atherothrombotic *** with the longterm use of antiplatelet agents,the safety and drug resistance has become a big concern in clinic and new drugs possessing higher effectiveness and fewer adverse effects are *** recent data support that traditional Chinese herbs may be a good alternative and complementary choice of new antiplatelet *** review highlights the progress of antiplatelet effect of active components derived from traditional Chinese herbs based on their chemical structures.

关键词： Chinese herbal medicine antiplatelet active components

System Size Resonance Associated with Canard Phenomenon in a Biological Cell System

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Chinese Journal of Chemical Physics 2008年第6期21卷 521-525页

作者： juan ma Hong-ying Li Zhong-huai Hou Hou-wen Xin Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Hefei National Lab of Physical Science at Microscale University of Science and TechnoloEy of China Hefei 230026 China Department of Chemistry Hefei Teachers College Hefei 230000 China

The influence of internal noise on the calcium oscillations is studied. It is found that stochastic calcium oscillations occur when the internal noise is considered, while the corresponding deterministic dynamics only yields a steady state. Also,. the performance of such oscillations shows two maxima with the variation of the system size, indicating the occurrence of system size resonance. This behavior is found to be intimately connected with the canard phenomenon. Interestingly, it is also found that one of the optimal system sizes matches well with the real cell size, and such a match is robust to the variation of the control parameters.

关键词： Internal noise Calcium oscillations System size resonance Canard phenomenon

One-dimensional molecular co-crystal alloys capable of full-color emission for low-loss optical waveguide and optical logic gate

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Aggregate 2024年第1期5卷 299-308页

作者： Zhenhong Qi Yu-juan ma Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage materials College of ChemistryKey Laboratory of Radio-pharmaceuticals Ministry of EducationBeijing Normal UniversityBeijingChina

The luminescence color of molecule-based photoactive materials is the key to the applications in lighting and optical *** continuous regulation of emission color in molecular systems is highly desirable but still remains a challenge due to the individual emission band of purely organic ***,a novel alloy strategy based on molecular co-crystals is *** adjusting the molar ratio of pyrene(Py)and fluorathene(Flu),three types of molecular co-crystal alloys(MCAs)assemblies are prepared involving Py-Flu-OFN-x%,Py-Flu-TFP-x%,Py-Flu-TCNB-x%.Multiple energy level structure and Förster resonance energy transfer(FRET)process endow materials with tunable full-spectra emission color in visible ***,these MCAs and co-crystals can be successfully applied to low optical loss waveguide and optical logic gate by virtue of all-color luminescence from blue across green to red,together with smooth surface of onedimensional microrods,which show promising applications as continuous light emitters for advance photonics applications.

关键词： full-color emission microrods molecular co-crystal optical waveguide organic alloys

Mothers’experiences of neonatal intensive care:A systematic review and implications for clinical practice

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World Journal of Clinical Cases 2021年第24期9卷 7062-7072页

作者： Li-Li Wang juan-juan ma Hao-Hao Meng Jie Zhou Department of Pediatrics Shenzhen Nanshan People’s HospitalShenzhen 518052Guangdong ProvinceChina Department of Nursing Shenzhen Shekou People’s HospitalShenzhen 518067Guangdong ProvinceChina

BACKGROUND Preterm birth is on the rise *** intensive care units(NICUs)have enabled many critically ill newborns to *** a premature baby is admitted to the NICU,the mother–infant relationship may be interrupted,affecting the mother's mental *** To examine the maternal emotions associated with having a child in the NICU and provide suggestions for clinical *** MEDLINE,CINAHL,PsychARTICLES,and PsychINFO were searched for relevant articles between 2005 to 2019,and six qualitative articles were chosen that explored the experiences of mothers who had a preterm infant in the *** thematic analysis method was used to identify the most common *** Four main themes of the experience of mothers who had a preterm infant in the NICU were identified:Negative emotional impacts on the mother,support,barriers to parenting,and establishment of a loving *** NICU environment is not conducive to mother-child bonding,but we stipulate steps that health care professionals can take to reduce the negative emotional toll on mothers of NICU babies.

关键词： Neonatal intensive care units Preterm infant maternal experience Mother-infant bond Implication Systematic review