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Performance and stability-enhanced inorganic perovskite light-emitting devices by employing triton X-100

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Chinese Physics B 2021年第4期30卷 629-632页

作者： Ao Chen Peng Wang Tao Lin Ran liu Bo liu Quan-Jun Li bing-bing liu State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Significantly enhanced electroluminescence performance and stability of all-inorganic perovskite light-emitting devices(PeLEDs) have been achieved by adding triton X-100 into the perovskite *** small perovskite grains arranged tightly and formed large grains as the triton X-100 were *** the nonradiative defects originated from Pb atoms at the grain boundaries were highly passivated by triton X-100 and resulted in the promotion of PeLED performance,including a turn-on voltage of 3.2 V,a brightness of 63500 cd/m^(2),a current efficiency of 17.4 cd/A,and a prolonged lifetime of 2 h in air.

关键词： electroluminescence performance stability perovskite light-emitting devices(Pe LEDs) triton X-100

Holocene Moisture Variation Recorded by Aeolian Sand-Palaeosol Sequences of the Gonghe Basin, Northeastern Qinghai-Tibetan Plateau, China

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 668-681页

作者： liu bing ZHAO Hui JIN Heling CHEN Fahu Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of ScienceLanzhou 730000China Key Laboratory of Western China's Environmental Systems Ministry of EducationLanzhou 73000China Key Laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

The northeastern Qinghai-Tibetan Plateau(QTP) of China is located at the triple junction of the Asian winter and summer monsoons and the westerlies, where paleoclimatic evolution has an important scientific significance for recognizing the spatial-temporal pattern of Asian monsoons in the past and predicting environmental change in the future. Nevertheless, the framework of the Holocene moisture variation and related mechanisms remain controversial, owing to complex hydroclimatic conditions triggered by the landform of the large mountain-arid basin. Here, we employed geochemical proxies from typical aeolian sand-palaeosol sequences in the Gonghe Basin, northeastern QTP, together with Optically Stimulated Luminescence(OSL) dating, to reconstruct the pattern of effective moisture variation and associated mechanisms in this region. Our results indicate that the regional effective moisture was at its lowest until 9–8 ka, and approached a maximum during 8–4/3 ka of the middle Holocene. Afterwards, the climate became relatively dry in general, but with a transient humid interval around 2–1 ka. Our geochemical evidence indicates that the dry early Holocene probably can be attributed to a strong winter monsoon forced by remnant ice sheet, combined with the high evaporation caused by solar insolation. Also, shifts of humid-dry are closely linked to the Asian summer monsoonal strength and therefore the balance of evaporation-precipitation in the middle and late Holocene. Thus, the pattern of the Holocene effective moisture variation is characterized as the ‘monsoon model’ in a closed intermontane arid and semi-arid basin near the western Asian monsoonal limit.

关键词： effective moisture geochemical analysis aeolian deposits Holocene Gonghe Basin

Fine-Grained Emotion Prediction for Movie and Television scene images

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The Journal of China Universities of Posts and Telecommunications 2024年第3期31卷 43-55页

作者： Su Zhibin Zhou Xuanye liu bing Ren Hui State Key Laboratory of Media Convergence and Communication Communication University of ChinaBeijing 100024China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Communication University of ChinaBeijing 100024China School of Information and Communication Engineering Communication University of ChinaBeijing 100024China

For the task of content retrieval,analysis and generation of film and television scene images in the field of intelligent editing,fine-grained emotion recognition and prediction of images is of great *** this paper,the fusion of traditional perceptual features,art features and multi-channel deep learning features are used to reflect the emotion expression of different levels of the *** addition,the integrated learning model with stacking architecture based on linear regression coefficient and sentiment correlations,which is called the LS-stacking model,is proposed according to the factor association between multi-dimensional *** experimental results prove that the mixed feature and LS-stacking model can predict well on the 16 emotion categories of the self-built image *** study improves the fine-grained recognition ability of image emotion by computers,which helps to increase the intelligence and automation degree of visual retrieval and post-production system.

关键词： fine-grained emotion prediction movie and television scene images stacking model linear regression

Tolerance and safety evaluation of sodium sulfate:A subchronic study in laying hens

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Animal Nutrition 2021年第2期7卷 576-586页

作者： bing liu Jiaming Zhu Qin Zhou Dongyou Yu College of Animal Sciences Zhejiang UniversityHangzhou310058China State Key Laboratory of Food Science and Technology and Synergetic Innovation Center of Food Safety and NutritionJiangnan UniversityWuxi214122China

Sodium sulfate(Na2SO4)is a readily available chlorine-free source of sodium,which could be used to reduce sodium chloride to maintain the ratio between chlorine and sodium in poultry *** supplementation with excessive levels of Na2SO4 might be detrimental to bird's health and per-formance.A subchronic study was carried out to investigate the potential adverse effects of an accidental oversupply of Na2SO4 in the diets of laying *** hundred and fifty 21-week-old Hy-Line White layers were randomly assigned to 5 treatments with 6 *** birds were fed diets supplemented with 0(control),0.3%,0.6%,1.5%,and 3.0%Na2SO4 for 8 *** perfor-mance,egg quality parameters,clinical blood parameters,histopathology,intestinal barrier func-tions,and intestinal microflora composition were *** clinical signs of intoxication or mortality were observed during the experimental *** results of this study showed that the optimal levels of Na2SO4(0.3%to 0.6%)significantly improved the laying rates,average daily egg mass,and eggshell quality of hens compared to the control(P<0.05).However,3.0%Na2SO4 produced negative effects on laying performance,eggshell quality,blood biochemistry,and partic-ularly on liver and kidney pathology,and intestinal morphology and barrier functions compared with the *** minor changes were observed in clinical blood parameters of hens receiving 1.5%Na2SO4,these were not considered to be of toxicological significance due to the absence of any organ pathological changes in *** conclusion,our results indicated that a Na2SO4 concentration of 1.5%was non-deleterious to laying hens after a daily administration for 56 d,namely that dietary supplementation of up to 5 times the maximum recommended dose is safely tolerated by laying hens.

关键词： Sodium sulfate Tolerance Histopathology Intestinal function Laying hen

An Approximate Linear Solver in Least Square Support Vector Machine Using Randomized Singular Value Decomposition

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Wuhan University Journal of Natural Sciences 2015年第4期20卷 283-290页

作者： liu bing XIANG Hua School of Mathematics and Statistics Wuhan University

In this paper, we investigate the linear solver in least square support vector machine（LSSVM） for large-scale data regression. The traditional methods using the direct solvers are costly. We know that the linear equations should be solved repeatedly for choosing appropriate parameters in LSSVM, so the key for speeding up LSSVM is to improve the method of solving the linear equations. We approximate large-scale kernel matrices and get the approximate solution of linear equations by using randomized singular value decomposition（randomized SVD）. Some data sets coming from University of California Irvine machine learning repository are used to perform the experiments. We find LSSVM based on randomized SVD is more accurate and less time-consuming in the case of large number of variables than the method based on Nystrom method or Lanczos process.

关键词： least square support vector machine Nystr?m method Lanczos process randomized singular value decomposition

Adaptability of n-γdiscrimination and filtering methods based on plastic scintillation

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Nuclear Science and Techniques 2021年第3期32卷 63-71页

作者： Zhuo Zuo Hao-Ran liu Yu-Cheng Yan bing-Qi liu Song Zhang Chengdu University of Technology College of Engineering Technology Leshan 614000SichuanChina Southwest Institute of Physics Chengdu 610225China Chengdu University Chengdu 610106China Chengdu University of Technology Chengdu 610225China

Neutrons have been extensively used in many fields,such as nuclear physics,biology,geology,medical science,and national defense,owing to their unique penetration *** rays are usually accompanied by the detection of *** capability to discriminate neutrons from gamma rays is important for evaluating plastic scintillator neutron detectors because similar pulse shapes are generated from both forms of radiation in the detection *** pulse signals measured by plastic scintillators contain noise,which decreases the accuracy of n-y *** improve the performance of n-y discrimination,the noise of the pulse signals should be filtered before the n-y discrimination *** this study,the influences of the Fourier transform,wavelet transform,moving-average filter,and Kalman algorithm on the charge comparison method,fractal spectrum method,and back-propagation neural network methods were *** was found that the Fourier transform filtering algorithm exhibits better adaptability to the charge comparison method than others,with an increasing accuracy of 6.87%compared to that without the filtering ***,the Kalman filter offers an improvement of 3.04%over the fractal spectrum method,and the adaptability of the moving-average filter in backpropagation neural network discrimination is better than that in other methods,with an increase in 8.48%.The Kalman filtering algorithm has a significant impact on the peak value of the pulse,reaching 4.49%,and it has an insignificant impact on the energy resolution of the spectrum measurement after discrimination.

关键词： Fourier transform Wavelet transform Moving average Kalman filter Charge comparison method Fractal spectrum method Back-propagation neural network

Geometrical quantum discord and negativity of two separable and mixed qubits

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Chinese Physics B 2019年第9期28卷 107-113页

作者： Tang-Kun liu Fei liu Chuan-Jia Shan Ji-bing liu College of Physics and Electronic Science Hubei Normal University

We studied quantum correlation and quantum entanglement of a quantum system in which a coherent state light field interacts with two qubits that are initially prepared in a separable and mixed *** influence of mean photon number of the coherent field and distribution probability of the atom on the geometrical quantum discord and the negativity are *** results show that the mean photon number of light field and distribution function of the atom can regulate and control the quantum correlation and quantum entanglement.

关键词： geometrical quantum discord quantum correlation negativity quantum entanglement

Effects of air plasma flame on the ZrB_(2)-based UHTC coatings:Microstructure,phase evolution and ablation resistance

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Journal of Materials Science & Technology 2023年第27期158卷 194-206页

作者： Dou Hu Qiangang Fu Lei Zhou Xiaoxuan Li bing liu State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light-Weight CompositesNorthwestern Polytechnical UniversityXi’an 710072China

As for the air plasma sprayed ZrB_(2)-based coatings,B content change caused by inevitable oxidation is predictable but commonly *** by air plasma flame,the B element loss and residual B_(2) O_(3) in the sprayed ZrB_(2) coating were ***,how the B content change affects the microstructure,phase evolution,and ablation resistance(2.4 MW/m^(2),60 s)of ZrB_(2)-based coatings with different sec-ondary phases(SiC,MoSi_(2),and TaC)was *** B element loss contributed to the increase in surface temperature and the decline in the sintering degree of the ZrO_(2) *** evaporation of residual B_(2)O_(3) caused damage to the coating structure in the form of pores,whose negative effect was enhanced and reduced by MoSi_(2) and TaC secondary phases,*** work will provide some insight into thermally sprayed non-oxide ceramic coatings in the atmosphere.

关键词： Plasma spraying UHTCs Ablation behavior Microstructure ZrB_(2)

Experimental research and energy analysis of a new type of dry ice powder pneumatic rock breaking technology

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International Journal of Mining Science and Technology 2023年第4期33卷 423-435页

作者： Xiaofei Wang Shaobin Hu Enyuan Wang Qiang Zhang bing liu Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology)Ministry of Education Xuzhou 221116China National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering HoHai UniversityNanjing 210098China Tunnel and Underground Engineering Institute College of Civil and Transportation EngineeringHoHai UniversityNanjing 210098China China Electric Construction East China Survey and Design Institute Hangzhou 311122China

When the traditional drill and blast method is applied to rock crushing projects,it has strong vibration,loud noise and dust pollution,so it cannot be used in densely populated areas such as urban public *** developed a supercritical CO_(2)true triaxial pneumatic rock-breaking experimental system,and conducted laboratory and field tests of dry ice powder pneumatic *** characteristics of the blast-induced vibration velocity waveform and the evolution of the vibration velocity and frequency with the focal distance were analyzed and *** fracturing mechanism of dry ice powder pneumatic rock breaking is *** research results show that:(1)The vibration velocity induced by dry ice powder pneumatic rock breaking decays as a power function with the increase of the focal distance;(2)The vibration frequency caused by dry ice powder pneumatic rock breaking is mainly distributed in 1–120 *** to the dispersion effect,the dominant frequency of 10–30 Hz appears abnormally attenuated;(3)The traditional CO_(2)phase change fracturing energy calculation formula is also applicable to dry ice pneumatic rock breaking technology,and the trinitrotoluene(TNT)equivalent of fracturing energy is applicable to the Sadovsky formula;(4)Dry ice powder pneumatic rock breaking is shock wave and highenergy gas acting together to fracture rock,which can be divided into three stages,among which the gas wedge action of high-energy gas plays a dominant role in rock mass damage.

关键词： Dry ice powder pneumatic rock breaking Cracking mechanism Energy analysis Vibration frequency