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中国药理学与毒理学杂志 2015年第S1期29卷 74-75页

作者： Ning jiang si-di LI Wen-xia ZHOU Yong-xiang ZHANG Beijing Institute of Pharmacology and Toxicology China Beijing 100850

OBJECTIVE To investigate age-related functional change of hypothalamus-pituitary-adrenal(HPA)axis in senescence accelerated mouse(SAM)and the effects of Liuwei Dihuang decoction(LW)and its San-bu(three tonics)and San-xie(three eliminators)components on the function of HPA *** Male SAM-resistance/1(SAMR1)and SAM-prone/8(SAMP8)at the ages of 6and 12 months old were ***8 were orally administered with LW,three tonics and three eliminators at the doses of 10,6.4and 3.6g·kg-1·d-1,respectively,for consecutive 60 *** level of CORT was assayed with ELISA *** levels of hypothalamic CRH and pituitary ACTH was determined with *** The levels of hypothalamic CRH,pituitary ACTH and serous CORT were much higher in 6 and 12 months old SAMP8 than those in age-matched SAMR1,which suggested the abnormal function of HPA axis in *** administration of LW and three tonics significantly decreased the level of hypothalamic CRH of 6 and 12 months old SAMP8,and reduced the levels of pituitary ACTH and serous CORT of 6 month old *** eliminators significantly decreased the level of hypothalamic CRH of 6 months old *** results indicated that oral administration of LW,three tonics and three eliminators improved the function of HPA axis of *** The results showed the hyperactivity of HPA axis of SAMP8,and LW improved the hyperactivity of 6 month old *** tonics and three eliminators had similar effects as LW,which had better effect after compatibility.

关键词： Liuwei Dihuang decoction senescence accelerated mo

Crystallization Behavior and Dynamic Mechanical Properties of Poly(ε-caprolactone)/Octaisobutyl-Polyhedral Oligomeric silsesquioxanes Composites Prepared via Different Methods

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Chinese Journal of Polymer Science 2020年第2期38卷 158-163,I0006页

作者： si-Qi Teng Zhi-Guo jiang Zhao-Bin Qiu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Two octaisobutyl-polyhedral oligomeric silsesquioxanes(oib-POSS)reinforced biodegradable poly(ε-caprolactone)(PCL)composites were prepared via two different methods,i.e.,melt compounding and solution casting,which were named as m PCL/oib-POSS and s PCL/oibPOSS,respectively,in this ***-POSS dispersed finely in both composites;moreover,oib-POSS aggregates were larger in m PCL/oib-POSS than in s PCL/*** the different preparation methods,oib-POSS obviously promoted the crystallization of PCL,especially in s PCL/oib-POSS,but did not modify the crystal structure of *** storage moduli of PCL were improved significantly in both ***/oib-POSS composites with enhanced crystallization behavior and improved dynamic mechanical properties were successfully prepared through both methods;moreover,the solution casting method was more effective than the melt compounding method.

关键词： Poly(ε-caprolactone) POSS Crystallization

Comparison of two methods used to culture and purify rat retinal Mller cells

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International Journal of Ophthalmology(English edition) 2013年第6期6卷 778-784页

作者： Wei-Tao Song Xue-Yong Zhang si-Qi Xiong Dan Wen Jian jiang xiao-Bo xia Department of Ophthalmology Xiangya HospitalCentral South University

AIM:To study two methods for culturing and purifying Sprague-Dawley(SD)rat retinal Muller cells and determine which one is ***:The passage culture method of Muller cells was respectively carried out by complete pancreatic enzyme digestion method and repeated incomplete pancreatic enzyme digestion *** culturing retinal cells for one month through these two methods,fluorescence-activated cell sorter(FACS),RT-PCR,and immunohistochemistry technology were performed to examine the enrichment and purity of Muller glial cells,and carried out two-sample approximate t test using SSPS 13.0 to further compare the Muller cell positive rate in both ***:The statistical results showed that the purity of Muller cells was 83.2%±5.16%in group A,and the purity was 98.5%±1.08%in group *** two-sample approximate t test analysis demonstrated that the difference between group A and group B was statistically significant(t=-9.178,PsiON:Compared with the complete pancreatic enzyme digestion method,this novel method was more efficient and a higher purity of Muller cells could be obtained using this approach.

关键词： primary culture passage purification retinal Mller cell trypsinization

Effects of relative humidity and PM2.5 chemical compositions on visibility impairment in Chengdu, China

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Journal of Environmental Sciences 2019年第12期31卷 15-23页

作者： Fan Liu Qinwen Tan xia jiang Fumo Yang Wenju jiang College of Architecture&Environment Sichuan UniversityChengdu 610065China Chengdu Academy of Environmental Sciences Chengdu 610072China National Engineering Research Center/or Flue Gas Desul/Urization Chengdw 610065China

To better understand the potential causes of visibility impairment in autumn and winter in Chengdu,relative humidity(RH),visibility,the concentrations of PM2.5 and its chemical components were on-line measured continuously in Chengdu from Nov.2016 to *** obvious haze episodes occurred in Chengdu,with the total time of haze episodes accounted for more than 90%of the total observation period,and higher NO2 concentrations and RH were related to the high particle concentrations in haze *** visibility decreased in a non-linear tendency under different RH conditions with the increase of PM2.5 concentrations,which was more sensitive to RH under lower PM2.5 *** threshold concentration of PM2.5 got more smaller with the increase of *** the entire observation period,organic matter(OM)was the largest contributor(31.12%to extinction coefficient(bext)),followed by NH4NO3 and(NH4)2SO4 with 28.03%and 23.01%,***,with the visibility impairment from Type I(visibility>10 km)to Type IV(visibility≤2 km),the contribution of OM to bextdecreased from 38.12%to 26.77%,while the contribution of NH4NO3 and(NH4)2SO4 to bextincreased from 19.09%and 20.20%to 34.29%and 24.35%,respectively,and NH4NO3 became the largest contributor to bextat Type *** results showed that OM and NH4NO3 were the key components of PM2.5 for visibility impairment in Chengdu,indicating that the control of precursors emissions of carbonaceous species and NH4NO3 could effectively improve the visibility in Chengdu.

关键词： Visibility impairment PM2.5 chemical composition Relative humidity Light extinction coefficient Secondary formation

simultaneous nitrogen and phosphorus removal under low dissolved oxygen conditions

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Journal of Environmental Sciences 2001年第1期13卷 46-50页

作者： xia si-qing GAO Ting-yao ZHOU Zeng-yuan School of Environmental Science and Engineering Tongji UniversityShanghai 200092China

A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent meas of CODCr,, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.

关键词： high concentration activated sludge low dissolved oxygen process nitrogen removal phosphorus removal

Preparation of Poly(phosphoric acid piperazine) and Its Application as an Effective Flame Retardant for Epoxy Resin

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Chinese Journal of Polymer Science 2018年第5期36卷 655-664页

作者： Miao-Jun Xu si-Yu xia Chuan Liu Bin Li Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials College of Science Northeast Forestry University

A phosphorus-nitrogen containing flame retardant additive of poly（phosphoric acid piperazine）, defined as PPAP, was synthesized by the salt-forming reaction between anhydrous piperazine and phosphoric acid, and the dehydration polymerization under heating in nitrogen atmosphere. Its chemical structure was well characterized by Fourier transform infrared（FTIR） spectroscopy, ^（13）C and ^（31）P solid-state nuclear magnetic resonance measurements. The synthesized PPAP and curing agent m-phenylenediamine were blended into epoxy resin（EP） to prepare flame retardant EP thermosets. The effects of PPAP on the fire retardancy and thermal degradation behavior of cured EP/PPAP composites were investigated by limiting oxygen index（LOI）, vertical burning（UL-94）, thermogravimetric analysis/infrared spectrometry（TG-IR） and cone calorimeter tests. The morphologies and chemical compositions of char residues for cured epoxy resin were investigated by scanning electron microscopy（SEM） and X-ray photoelectron spectroscopy（XPS）, respectively. The results demonstrated that the flame retardant EP thermosets successfully passed UL-94 V-0 flammability rating and the LOI value was as high as 30.8% when incorporating 5 wt% PPAP into the EP thermosets. The TGA results indicated that the synthesized PPAP flame retardant additive possessed high thermal stability and excellent charring capability. Meanwhile, the incorporation of PPAP stimulated the epoxy resin matrix to decompose and charring ahead of time due to its catalytic decomposition effect, which led to a higher char yield at high temperature. The morphological structures and the analysis results of XPS for char residues of EP thermosets revealed that the introduction of PPAP benefited the formation of a sufficient, more compact and homogeneous char layer containing phosphorus-nitrogen flame retardant elements on the material surface during combustion. The formed char layer with high quality effectively prevented the heat transmission and d

关键词： Synthesis Poly(phosphoric acid piperazine) Flame retardant Epoxy resin thermosets Thermal degradation

On P≥3-factor Deleted Graphs

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Acta Mathematicae Applicatae sinica 2022年第1期38卷 178-186页

作者： si-zhong ZHOU Zhi-ren SUN Hong-xia LIU School of Science Jiangsu University of Science and TechnologyZhenjiang 212100China School of Mathematical Sciences Nanjing Normal UniversityNanjing 210023China School of Mathematics and Information Sciences Yantai UniversityYantai 264005China

A spanning subgraph F of a graph G is called a path factor of G if each component of F is a path.A P≥k-factor means a path factor with each component having at least k vertices,where k≥2 is an ***,Benhamdine,Li and Wozniak[***,***,***,***,Partitioning vertices of 1-tough graph into paths,***.263(2001)255–261.]obtained a toughness condition for a graph to have a P≥*** introduce the concept of a P≥k-factor deleted graph,that is,if a graph G has a P≥k-factor excluding e for every e∈E(G),then we say that G is a P≥k-factor deleted *** this paper,we show four sufficient conditions for a graph to be a P≥3-factor deleted ***,it is shown that four results are best possible in some sense.

关键词： toughness isolated toughness connectivity P≥3-factor P≥3-factor deleted graph

Feature Layer Fusion of Linear Features and Empirical Mode Decomposition of Human EMG signal

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Journal of Electronic Science and Technology 2022年第3期20卷 257-269页

作者： Jun-Yao Wang Yue-Hong Dai xia-Xi si the School of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu611731China the Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of sichuan Province University of Electronic Science and Technology of ChinaChengdu611731China

To explore the influence of the fusion of different features on recognition,this paper took the electromyography(EMG)signals of rectus femoris under different motions(walk,step,ramp,squat,and sitting)as samples,linear features(time-domain features(variance(VAR)and root mean square(RMS)),frequency-domain features(mean frequency(MF)and mean power frequency(MPF)),and nonlinear features(empirical mode decomposition(EMD))of the samples were *** feature fusion algorithms,the series splicing method and complex vector method,were designed,which were verified by a double hidden layer(BP)error back propagation neural *** show that with the increase of the types and complexity of feature fusions,the recognition rate of the EMG signal to actions is gradually *** the EMG signal is used in the series splicing method,the recognition rate of time-domain+frequency-domain+empirical mode decomposition(TD+FD+EMD)splicing is the highest,and the average recognition rate is 92.32%.And this rate is raised to 96.1%by using the complex vector method,and the variance of the BP system is also reduced.

关键词： Complex vector method electromyography(EMG)signal empirical mode decomposition feature layer fusion series splicing method

An Alamouti coded CP-FBMC-MIMO system with two transmit antennas

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Science China(Information Sciences) 2015年第10期58卷 127-132页

作者： KONG DeJin xia xiang-Gen jiang Tao Wuhan National Laboratory for Optoelectronics School of Electronics Information and CommunicationsHuazhong University of Science and Technology Department of Electrical and Computer Engineering University of Delaware

In this paper, we propose an Alamouti coding for filter bank multicarrier(FBMC) with cyclic prefix(CP) for two transmit antennas, which can avoid the imaginary interference problem existing in the conventional FBMC with multi-antenna systems. Instead of performing Alamouti coding on original data symbols, we perform Alamouti coding on pre-processing signal at the transmitter in our proposed scheme. We show that our proposed scheme has fast single-symbol maximum-likelihood(ML) decoding and achieves full spatial diversity. simulation results show that the proposed scheme can achieve the BER performance of Alamouti coding under both of the flat-fading channel and the frequency-selective channel. Therefore, it is an efficient Alamouti coding scheme for CP-FBMC systems with two transmit antennas.

关键词： filter bank multi carrier(FBMC) multi-input multi-output(MIMO) Alamouti code MIMOFBMC spatial diversity cyclic prefix(CP)

Cutting Force Fluctuation Suppression and Error Homogenization of Noncircular Gear Hobbing Based on the Tool Shifting Method

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 167-179页

作者： Dazhu Li jiang Han xiaoqing Tian Lian xia Institute of Artificial Intelligence Anhui Polytechnic UniversityWuhu 241000China CIMS Institute Hefei University of TechnologyHefei 230009China

The current research on noncircular hobbing mainly focuses on the linkage model and motion ***,the intermittent cutting characteristics of hobbing would increase uncertainties in the manufacturing *** this paper,a hobbing machining model with tool-shifting characteristics was proposed to solve the problems of cutting force fluctuation and inconsistency of tooth profile envelope accuracy at different positions of the pitch curve in noncircular gear *** on the unit cutting force coefficient method,the undeformed chip volume generated by interrupted cutting was used to characterize the fluctuation trend of the hobbing *** fluctuation characteristics of the cutting force generated by different hobbing models were compared and *** the equivalent gear tooth and hob slotting numbers,an analysis model of the tooth profile envelope error of the noncircular gear was ***,the tooth profile envelope errors at different positions of the pitch curve were compared and analyzed based on the constructed *** transmission structure of the electronic gearbox was constructed based on the proposed hobbing model,and the hobbing experiment was conducted based on the selfdeveloped noncircular gear CNC hobbing *** paper proposes a hobbing method that can effectively suppress the fluctuation of the peak and whole circumference cutting force and reduce the maximum envelope error of the whole circumference gear teeth.

关键词： Noncircular gear Gear hobbing Cutting force Envelope error Machining model