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Effect of magnetic flow and external forcing current on mixed bursting in the pre-Botzinger complex

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Chinese Physics B 2019年第11期28卷 120-128页

作者： Dou-Dou Guo Zhuo-sheng lu School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

The pre-B?tzinger complex(pre-B?tC) in mammalian brainstem is essential for the generation of respiratory *** dynamic studies on the pre-B?tC neuron have been focused on its firing activities modulated by the ion conductances rather than that by the electromagnetic radiation or the external forcing current. In this paper, by adding the electromagnetic radiation and external forcing current to Park and Rubin’s model, we mainly investigate the influences of those two factors on the mixed bursting(MB) of single pre-B?tC neuron. First, we explore how the variation of external forcing current affects the MB patterns of the system with non-vanishing magnetic flux. We classify the MB patterns and show their dynamic mechanism through fast-slow decomposition and bifurcation analysis. Then, by modifying the feedback coefficient, we further analyze the sole effect of electromagnetic radiation on the firing activities of the system. Our results may be instructive in understanding the dynamical behavior of pre-B?tC neuron.

关键词： pre-Botzinger complex mixed bursting magnetic flow dynamical analysis

CNN-LSTM based incremental attention mechanism enabled phase-space reconstruction for chaotic time series prediction

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Journal of Electronic Science and Technology 2024年第2期22卷 77-90页

作者： Xiao-Qian lu Jun Tian Qiang liao Zheng-Wu Xu lu Gan Bidding and Purchasing Center University of Electronic Science and Technology of ChinaChengdu611731China Yibin Research Institute University of Electronic Science and Technology of ChinaYibin644000China School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China

To improve the prediction accuracy of chaotic time series and reconstruct a more reasonable phase space structure of the prediction network,we propose a convolutional neural network-long short-term memory(CNN-LSTM)prediction model based on the incremental attention ***,a traversal search is conducted through the traversal layer for finite parameters in the phase ***,an incremental attention layer is utilized for parameter judgment based on the dimension weight criteria(DWC).The phase space parameters that best meet DWC are selected and fed into the input ***,the constructed CNN-LSTM network extracts spatio-temporal features and provides the final prediction *** model is verified using Logistic,Lorenz,and sunspot chaotic time series,and the performance is compared from the two dimensions of prediction accuracy and network phase space ***,the CNN-LSTM network based on incremental attention is compared with long short-term memory(LSTM),convolutional neural network(CNN),recurrent neural network(RNN),and support vector regression(SVR)for prediction *** experiment results indicate that the proposed composite network model possesses enhanced capability in extracting temporal features and achieves higher prediction ***,the algorithm to estimate the phase space parameter is compared with the traditional CAO,false nearest neighbor,and C-C,three typical methods for determining the chaotic phase space *** experiments reveal that the phase space parameter estimation algorithm based on the incremental attention mechanism is superior in prediction accuracy compared with the traditional phase space reconstruction method in five networks,including CNN-LSTM,LSTM,CNN,RNN,and SVR.

关键词： Chaotic time series Incremental attention mechanism Phase-space reconstruction

Cyclic oxidation behavior of Cr-/Si-modified NiAlHf coatings on single-crystal superalloy produced by EB-PVD

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Rare Metals 2016年第5期35卷 396-400页

作者： lu Wang lu-lu Pan Hui Peng Hong-Bo Guo sheng-Kai Gong School of Materials Science and Engineering Beihang University Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang University

The Cr-/Si-modified Ni Al Hf coatings were produced on single-crystal（SC） superalloy N5 by electron beam physical vapor deposition（EB-PVD）. The cyclic oxidation behavior of the coatings at 1100 °C was investigated. The microstructures of the oxide scales grown on the coatings were characterized by scanning electron microscope（SEM） with energy-dispersive X-ray spectrum（EDX）,electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）. The effects of Cr and Si on the cyclic oxidation behavior of the Ni Al Hf coatings were discussed. The addition of Si to the Ni Al Hf Cr coating not only reduces the oxidation rate but also enhances the oxide scale *** to the addition of Si in the coating, the segregation of Cr and Mo beneath the oxide scale is effectively avoided,which contributes to enhancing oxide scale adherence.

关键词： Reactive element NiAlHf coating Oxidation Electron beam physical vapor deposition Superalloy

Synthesis and luminescence properties of Mn4+-dopant Ca14Zn6Ga10-xAlxO35solid solution

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Progress in Natural Science:Materials International 2018年第3期28卷 301-307页

作者： Yiyang Zhou Weiren Zhao Chongrui lu Zifeng liao School of Physics and Optoelectronic Engineering Guangdong University of Technology

Mn4+-activated oxide phosphors,owing to their desirable spectral features,eco-friendly and low cost,are emerging as a new class of non-rare-earth red phosphors for warm white ***,these phosphors possess low photoluminescence quantum efficiency excited by blue chip *** we report an isostructural solid solution of Ca14Zn6Ga10-xAlxO35:0.15Mn4+（0≤x≤10）synthesized by a traditional solidstate reaction *** microstructure and luminescent performance of this red-emitting phosphor are investigated in detail with the aids of X-ray diffraction,diffuse reflection spectra,photoluminescence spectra/decay/QE,and temperature-dependent PL/QE *** shift of energy peaks of4A2→4T1and4A2→4T2transition is illustrated by the Tanabe–Sugano diagram and the configurational coordinate *** crystal field strength（Dq）and the Racah parameters（B and C）are carefully calculated to estimate the nephelauxetic effectβ*** we achieve external and internal quantum efficiencies as high as26.1%and 40.3%for Ca14Zn6Ga6Al4O35:0.15Mn4+excited by 466 nm,the highest one ever reported in Mn4+activated oxide phosphors under the similar condition.

关键词： Crystal phase Quantum efficiency Red emission Blue shift

Study on fire extinguishing performance of ultrafine water mist in a cup burner

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Science China(Technological Sciences) 2012年第7期55卷 1982-1987页

作者： LIANG TianShui liao GuangXuan lu SiuMing WANG XiShi State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Departrnent of Building and Construction City University of Hong KongKowloonHong KongSAR 999077China

Two simplified models for predicting minimum extinguishing concentration(MEC) of ultrafine water mist(UFM)(<10 m) were developed based on limiting oxygen concentration(LOC) and combustion limit temperature(CLT),*** wa... 详细信息

Two simplified models for predicting minimum extinguishing concentration(MEC) of ultrafine water mist(UFM)(luate the fire extinguishing performance of *** results agree well with the model based on LOC,and disagree with the model based on *** disagreements were explained by analyzing flow behavior of *** was concluded that the primary mechanism of fire extinguishment with UFM was oxygen dilution.

关键词： water mist limiting oxygen concentration combustion limit temperature extinguishing concentration cup burner

Effects of Hemp seed soft capsule on colonic ion transport in rats

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World Journal of Gastroenterology 2017年第42期23卷 7563-7571页

作者： Xiao-Fang lu Meng-Di Jia sheng-sheng Zhang lu-Qing Zhao Digestive Disease Center Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University

AIM To investigate the effect of Hemp seed soft capsule(HSCC) on colonic ion transport and its related mechanisms in constipation *** Sprague-Dawley male rats were randomly divided into three groups: normal group, constipation group and HSSC group. Rats in the constipation and HSSC groups were administrated loperamide 3 mg/kg per day orally for 12 d to induce the constipation model. Then, the HSSC group was given HSSC 0.126 g/kg per day by gavage for 7 d. The normal and constipation groups were treated with distilled water. After the treatment, the fecal wet weight and water content were measured. The basal short-circuit current(Isc) and resistance were measured by an Ussing Chamber. Besides the in vivo drug delivery experiment above, an in vitro drug application experiment was also conducted. The accumulative concentrations of HSSC(0.1 mg/m L, 0.5 mg/m L, 1.0 mg/m L, 2.5 mg/m L, 5.0 mg/m L, 10.0 mg/m L and 25.0 mg/m L) were added to the normal isolatedcolonic mucosa and the Isc was recorded. Further, after the application of either ion(Cl^-or HCO_3^-) substitution, ion channel-related inhibitor(N-phenylanthranilic acid, glybenclamide, 4,4-diisothiocyano-2,2-stilbenedisulfonic acid or bumetanide) or neural pathway inhibitor [tetrodotoxin(TTX), atropine, or hexamethonium], the Isc induced by HSSC was also measured. RESULTS In the constipation group, the fecal wet weight and the water content were decreased in comparison with the normal group(P < 0.01). After the treatment with HSSC, the fecal wet weight and the water content in the HSSC group were increased, compared with the constipation group(P < 0.01). In the constipation group, the basal Isc was decreased and resistance was increased, in comparison with the normal group(P < 0.01). After the treatment with HSSC, the basal Isc was increased(P < 0.05) and resistance was decreased(P < 0.01) in the HSSC group compared with the constipation group. In the in vitro experiment, beginning with the concentration of

关键词： Hemp seed soft capsule Constipation Ion transport Cl^- HCO3-

Nutritional strategies for reducing nitrogen, phosphorus and trace mineral excretions of livestock and poultry

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Journal of Integrative Agriculture 2017年第12期16卷 2815-2833页

作者： lu Lin liao Xiu-dong luO Xu-gang Mineral Nutrition Research Division Institute of Animal Science Chinese Academy of Agricultura Sciences Beijing 100193 P.R.China

Animal agriculture contributes to environmental pollutions through the surplus nitrogen（N）, phosphorus（P）, and trace minerals that animals excrete. Animal nutritionists have sought alternatives to formulate more efficient diets and reduce production costs and environmental concerns. In general, element excretions may be reduced by avoiding the overfeeding of specific elements or using nutritional approaches to improve element utilizations by the animals. Several nutritional strategies are possible for minimizing N, P, and trace mineral excretions： 1） to accurately meet dietary N, P and trace mineral requirements of animals, which includes reducing the dietary crude protein contents with synthetic amino acids or feeding high rumenally undegraded protein, minimizing the adequate levels of dietary P and trace elements, adopting phase or group-feeding program, and considering the bioavailable trace mineral contents in the feed ingredients; 2） to improve the bioavailabilities of dietary N, P, and trace elements for animals by using some additives（enzymes, growth promoters, probiotics, prebiotics, vitamin D isomers, and organic acids）; 3） to use highly available P sources or organic trace elements. In the future, nutrient strategies must be integrated into total production systems so that animal production systems are environmentally safe as well as economically viable.

关键词： nutritional strategies nitrogen phosphorus trace minerals animal excretions

On Meromorphic Solutions of a Certain Type of Nonlinear Differential Equations

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Acta Mathematica Sinica,English Series 2017年第12期33卷 1597-1608页

作者： Xiao Qing lu Liang Wen liao Jun WANG Mathematics and Information Technology School Jiangsu Second Normal UniversityNanjing 210013P.R.China Department of Mathematics Nanjing UniversityNanjing 210093P.R.China School of Mathematical Sciences Fudan UniversityShanghai 200433P.R.China

We consider transcendental merornorphic solutions with N（r, f） = S（r, f） of the following type of nonlinear differential equations：f^n ＋ Pn-2（f） = p1（z）e~α1（z）＋ p2（z）^α2（z）,where n ≥2 is an integer, Pn-2（f） is a differential polynomial in f of degree not greater than n-2 with small functions of f as its coefficients, p1（z）, p2（z） are nonzero small functions of f1 and α1（z）, α2（z） are nonconstant entire functions. In particular, we give out the conditions for ensuring the existence of meromorphic solutions and their possible forms of the above equation. Our results extend and improve some known results obtained most recently.

关键词： Meromorphic solutions nonlinear differential equations small functions Nevanlinna's value distribution theory

Extraction and Separation of Rare Earths from Nitrate Medium by Mixtures of p-Phosphorylated Calixarene and 1-Phenyl-3-methyl-4-benzoyl-pyrazalone-5

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Chinese Journal of Chemistry 2014年第10期32卷 1077-1082页

作者： Youcai lu Yanling Li Yanfeng Bi Wuping liao State Key Laboratory of Rare Earth Resource Utilization ERC for the Separation and Purification of REs and ThoriumChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Chinese Academy of Sciences Beijing 100049China

The gadolinium extraction by the mixtures of p-phosphorylated calixarene and 1-phenyl-3-methyl-4-benzoylpyrazalone-5 from nitrate medium was studied,which indicated an obvious synergistic effect between these two *** extractants exhibit no interaction with each other before the metal ***(Ⅲ)was extracted by the species of Ln(PMBP)_(2)L_(2)(NO_(3))instead of Ln(PMBP)_(3)•(HPMBP)or Ln(NO_(3))_(3)•2L which are extracted by HPMBP or L *** functions(ΔG,ΔH,ΔS)were *** extraction of other rare earths was also investigated and *** single rare earth separation was discussed.

关键词： synergistic extraction 1-phenyl-3-methyl-4-benzoyl-2-pyrazolin-5-one p-phosphorylated calixarene rare earths