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Miniaturized and highly sensitive fiber-optic Fabry–Perot sensor for mHz infrasound detection

Photonics Research 2024年第5期12卷 969-978页

作者： PEIJIE WANG YUFENG PAN JIANGSHAN ZHANG JIE ZHAI deming liu PING LU Wuhan National Laboratory for Optoelectronics(WNLO)and National Engineering Research Center of Next Generation Internet Access System School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China Department of Electronics and Information Engineering Huazhong University of Science and TechnologyWuhan 430074China

Infrasound detection is important in natural disasters monitoring,military defense,underwater acoustic detection,and other ***-optic Fabry–Perot(FP)acoustic sensors have the advantages of small structure size,long-distance detection,immunity to electromagnetic interference,and so *** size of an FP sensor depends on the transducer diaphragm size and the back cavity ***,a small transducer diaphragm size means a low ***,a small back cavity volume will increase the low cut-off frequency of the ***,it is difficult for fiber-optic FP infrasound sensors to simultaneously achieve miniaturization,high sensitivity,and extremely low detectable *** this work,we proposed and demonstrated a miniaturized and highly sensitive fiber-optic FP sensor for m Hz infrasound detection by exploiting a Cr-Ag-Au composite acoustic-optic transducer diaphragm and a MEMS technique-based spiral micro-flow *** use of the spiral micro-flow hole as the connecting hole greatly reduced the volume of the sensor and decreased the low-frequency limit,while the back cavity volume was not *** with the Cr-Ag-Au composite diaphragm,a detection sensitivity of-123.19 dB re 1 rad∕μPa at 5 Hz and a minimum detectable pressure(MDP)of1.2 mPa∕Hz^(1∕2)at 5 Hz were *** low detectable frequency can reach 0.01 Hz and the flat response range was 0.01–2500 Hz with a sensitivity fluctuation of±1.5 d ***,the size of the designed sensor was only 12 mm×Φ12.7 *** excellent characteristics make the sensor have great practical application prospects.

关键词： sound fiber cavity

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诺丽枸杞运动饮料研制及抗疲劳功能的研究

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农产品加工 2024年第12期 25-28页

作者：刘德明内蒙古包头市固阳县市场监督管理局固阳县检验检测中心内蒙古包头014200

以诺丽果和枸杞为主要原料研制一款新型运动饮料,通过响应面设计优化确定了诺丽果汁、枸杞汁、木糖醇、柠檬酸的最佳添加量,并通过小鼠负重游泳试验探究饮料的抗疲劳特性。结果表明,运动饮料的最佳工艺参数为诺丽果汁添加量14.68%,枸杞... 详细信息

以诺丽果和枸杞为主要原料研制一款新型运动饮料,通过响应面设计优化确定了诺丽果汁、枸杞汁、木糖醇、柠檬酸的最佳添加量,并通过小鼠负重游泳试验探究饮料的抗疲劳特性。结果表明,运动饮料的最佳工艺参数为诺丽果汁添加量14.68%,枸杞汁添加量20.82%,柠檬酸添加量0.16%,木糖醇添加量12.14%,对感官评分影响程度依次为柠檬酸添加量>木糖醇添加量>枸杞汁添加量>诺丽果汁添加量。对上述饮料的抗疲劳功能进行研究,结果表明小鼠连续灌胃上述饮料30 d后,平均游泳时间比对照组明显延长,说明诺丽果枸杞运动饮料具有显著抗疲劳的功效。

关键词：诺丽果枸杞运动饮料响应面抗疲劳

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Bifurcation of Degenerate Homoclinic Orbits toSaddle-Center in Reversible Systems

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Chinese Annals of Mathematics,Series B 2008年第6期29卷 575-584页

作者： Xingbo liu deming ZHU Department of Mathematics East China Normal University Shanghai 200241 China

The authors study the bifurcation of homoclinic orbits from a degenerate homoclinic orbit in reversible system. The unperturbed system is assumed to have saddle-center type equilibrium whose stable and unstable manifolds intersect in two-dimensional manifolds. A perturbation technique for the detection of symmetric and nonsymmetric homoctinic orbits near the primary homoclinic orbits is developed. Some known results are extended.

关键词： Reversible system Homoclinic orbits Saddle-center Bifurcation

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习近平文化思想的三重向度

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学术探索 2024年第5期 9-15页

作者：刘德铭方立江东北师范大学思想政治教育研究中心吉林长春130024 青海师范大学“两弹一星”精神研究院青海西宁810008

习近平文化思想是具有严整性、科学性、系统性逻辑架构的理论体系。可以从三重向度来解读习近平文化思想的逻辑架构:在目标向度上,系统诠释了文化自信的本质和文化自信在“四个自信”中的基础性地位,以中华优秀传统文化建设中华民族现... 详细信息

习近平文化思想是具有严整性、科学性、系统性逻辑架构的理论体系。可以从三重向度来解读习近平文化思想的逻辑架构:在目标向度上,系统诠释了文化自信的本质和文化自信在“四个自信”中的基础性地位,以中华优秀传统文化建设中华民族现代文明,依托坚定的文化自信助力文化强国建设;在实践向度上,以党的创新理论教育人民武装全党,担负起中华民族文化发展的新使命,在守正创新包容开放中坚定文化自信,激发全体社会成员投身文化建设的热情;在世界向度上,通过全方位推动中外文明深度交流互鉴,着力弘扬中国精神传播中国价值,讲好中国故事提高国际话语权,通过塑造良好中国形象增强中华文明的塑造力,多维度提升中华文化的国际影响力。

关键词：习近平文化思想目标向度实践向度世界向度

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Design and implementation of ethernet passive electronic network over coax

引用

High Technology Letters 2013年第3期19卷 290-294页

作者：黄晶 liu deming Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and EngineeringHuazhong University of Science and Technology

To increase the limit of ethernet over coax （EoC） technology in the bidirectional reform of the hybrid fiber coaxial （HFC） network, an ethernet passive electronic network （EPEN） system based on Coax is proposed and experimentally demonstrated in this paper. The proposed EPEN exploits the existing capabilities of the MAC layer in the ethernet passive optical network （EPON） for reduction of cost of the HFC network. As the MPCP （multi-point control protocol） is introduced in the EPEN, bandwidth control and higher efficiency can be achieved. The experimental results exhibit the throughput of system up to 100Mbps, which meet the requirements of HFC network. To improve the performance of EPEN, frequency division multiplexing （FDM） can be used for further increase of the throughput and more hardware processing modules in the future. can be implemented to enhance the capacity

关键词： ethernet over coax ( EoC ) ethernet passive electronic network ( EPEN) ethernetpassive optical network (EPON) multi-point control protocol (MPCP)

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Bifurcation of Homoclinic Orbits with Saddle-Center Equilibrium

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Chinese Annals of Mathematics,Series B 2007年第1期28卷 81-92页

作者： Xingbo liu Xianlong FU deming ZHU Department of Mathematics East China Normal University Shanghai 200062 China.

In this paper, the authors develop new global perturbation techniques for detecting the persistence of transversal homoclinic orbits in a more general nondegenerated system with action-angle variable. The unperturbed system is assumed to have saddlecenter type equilibrium whose stable and unstable manifolds intersect in one dimensional manifold, and does not have to be completely integrable or near-integrable. By constructing local coordinate systems near the unperturbed homoclinic orbit, the conditions of existence of transversal homoclinic orbit are obtained, and the existence of periodic orbits bifurcated from homoclinic orbit is also considered.

关键词： Local coordinate system Homoclinic orbit Bifurcation

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On modeling approach for embedded real-time software simulation testing

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Journal of Systems Engineering and Electronics 2009年第2期20卷 420-426页

作者： Yin Yongfeng liu Bin Zhong deming Jiang Tongmin Dept. of System Engineering of Engineering Technology Beihang Univ. Beijing 100191 P. R. China

Modeling technology has been introduced into software testing field. However, how to carry through the testing modeling effectively is still a difficulty. Based on combination of simulation modeling technology and embedded real-time software testing method, the process of simulation testing modeling is studied first. And then, the supporting environment of simulation testing modeling is put forward. Furthermore, an approach of embedded real-time software simulation testing modeling including modeling of cross-linked equipments of system under testing （SUT）, test case, testing scheduling, and testing system service is brought forward. Finally, the formalized description and execution system of testing models are given, with which we can realize real-time, closed loop, mad automated system testing for embedded real-time software.

关键词： embedded real-time software software testing testing modeling simulation

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Overfitting effect of artificial neural network based nonlinear equalizer: from mathematical origin to transmission evolution

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Science China(Information Sciences) 2020年第6期63卷 67-79页

作者： Zheng YANG Fan GAO Songnian FU Ming TANG deming liu Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and Technology Alibaba Infrastructure Service Alibaba Group

Overfitting effect of artificial neural network(ANN) based nonlinear equalizer(NLE) leads to a trap of bit error ratio(BER) overestimation in optical fiber communication system, especially when the performance is evaluated by the commonly-used pseudo-random binary sequence(PRBS). First, we mathematically investigate the PRBS generation and Gray code mapping rules, in comparison with the use of Mersenne Twister random sequence(MTRS). Under the condition of a symbol erasure channel, we identify that ANN can recognize both the PRBS generation and symbol mapping rules, by increasing the weights of NLE at specific positions, whereas the MTRS is currently safe owing to the limited input length of current ANN based NLE. Then, we design four channel models of fiber optical transmission to experimentally examine various impairments on the evolution of overfitting effect. When both the additive white Gaussian noise(AWGN) channel and the bandwidth limited channel are considered, the mitigation of overfitting becomes possible by the use of pruned PRBS(P-PRBS) training set with removing the generation and mapping rules determined input symbols. However, as for both the chromatic dispersion(CD) uncompensated channel and the CD managed channel, the overfitting effect becomes serious, because both CD and fiber nonlinearity induced inter-symbol interference(ISI) is beneficial for ANN to identify the PRBS symbol rules. Finally,possible solutions to mitigate the overfitting effect are summarized.

关键词： artificial neural network nonlinear equalizer pseudo-random binary sequence overfitting

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Hybrid WDM/TDM PON system employing an all-optical wavelength converter

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High Technology Letters 2012年第4期18卷 371-375页

作者：何炜 liu deming Qian Yinbo liu Hai School of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China National Engineering Laboratory for Next Generation Internet Access System Wuhan 430074 P. R. China

A new hybrid WDM/TDM passive optical network （PON） implemented by using all-optical wavelength converters （AOWCs） is proposed. The AOWCs are based on the cross-gain modulation （XGM） effect of the semiconductor optical amplifier （SOA）. Moreover, the feasibility of this sys- tem is experimentally demonstrated by evaluating the impacts of the optical wavelength conversion, time domain waveforms, eye diagrams and bit-error-rate （BER） in AOWC. The results show that the proposal will be a promising solution for the next generation access networks.

关键词： passive optical network (PON) wavelength division multiplexer (WDM) all-optical wavelength converter ( AOWC) cross-gain modulation (XGM)

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气体过滤用熔喷材料过滤性能的优化探讨

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产业用纺织品 2024年第9期42卷 9-14,20页

作者：邹萌萌刘德铭周朝钢山东希瑞新材料有限公司山东淄博255000

为实现气体过滤用熔喷材料兼具高过滤效率与低过滤阻力的目的,从材料的纤维平均直径及空间结构两方面入手,分析它们对熔喷材料过滤性能的影响,发现赋予材料更小的纤维平均直径可以提高过滤效率,赋予材料蓬松的空间结构可降低过滤阻力。... 详细信息

为实现气体过滤用熔喷材料兼具高过滤效率与低过滤阻力的目的,从材料的纤维平均直径及空间结构两方面入手,分析它们对熔喷材料过滤性能的影响,发现赋予材料更小的纤维平均直径可以提高过滤效率,赋予材料蓬松的空间结构可降低过滤阻力。研究结果可为生产兼具高效低阻特性的气体过滤用熔喷材料提供参考。

关键词：纤维平均直径蓬松性过滤效率过滤阻力高效低阻气体过滤熔喷材料

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