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Acta Mathematicae Applicatae Sinica 2014年第1期30卷 257-270页

作者： Qian XU Yue GUO department of basic courses Being Union University college of Mathematical Sciences Capital Normal University beijing No.19 Middle School

This paper is concerned with the existence and stability of steady states for a prey-predator system with cross diffusion of quasilineax fractional type. We obtain a sufficient condition for the existence of positive steady state solutions by applying bifurcation theory and a detailed priori estimate. In virtue of the principle of exchange of stability, we prove the stability of local bifurcating solutions near the bifurcation point.

关键词： global bifurcation stability

A study on students' on-line behaviors at business colleges——An empirical study based on business college of beijing union university

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A study on students' on-line behaviors at business colleges...

Pneumoconiosis: current status and future prospects

2013年教育技术与管理科学国际会议

作者： Xia Xu Xiuli Guo Information Network Center business college of beijing union university Department of Basic Courses Business College of Beijing Union University

The study is mainly about students’ on-line behaviors at business college of beijing union university. By tracking and analyzing students’ on-line behaviors at BCBUU for one semester, the characteristics of the students’ on-line behaviors at business colleges have been obtained, which can typically reflect the contemporary college students’ on-line behaviors in study, living, entertainment, consumption, etc.. These data and behavioral characteristics provide a realistic basis for college teachers to educate students in many aspects.

关键词： business college students on-line behaviors

来源： cnki会议评论

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Chinese Medical Journal 2021年第8期134卷 898-907页

作者： Xian-Mei Qi Ya Luo Mei-Yue Song Ying Liu Ting Shu Ying Liu Jun-Ling Pang Jing Wang Chen Wang department of Pathophysiology State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical SciencesChinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100730China beijing university of Chinese Medicine Beijing 100029China department of Physiology State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical SciencesChinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100730China

Pneumoconiosis refers to a spectrum of pulmonary diseases caused by inhalation of mineral dust,usually as the result of certain occupations.The main pathological features include chronic pulmonary inflammation and progressive pulmonary fibrosis,which can eventually lead to death caused by respiratory and/or heart failure.Pneumoconiosis is widespread globally,seriously threatening global public health.Its high incidence and mortality lie in improper occupational protection,and in the lack of early diagnostic methods and effective treatments.This article reviews the epidemiology,safeguard procedures,diagnosis,and treatment of pneumoconiosis,and summarizes recent research advances and future research prospects.

关键词： Pneumoconiosis Epidemiology Diagnosis Treatment Emerging technologies

Quenched moderate deviations principle for random walk in random environment

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Science China Mathematics 2010年第8期53卷 1947-1956页

作者： HONG WenMing 1 & WANG HuaMing 1,2 1 Key Laboratory of Mathematics and Complex Systems of Ministry of Education & School of Mathematical Sciences,beijing Normal university,beijing 100875,China 2 department of basic courses,business college,beijing union university,beijing 100025,China Key Laboratory of Mathematics and Complex Systems of Ministry of Education & School of Mathematical Sciences Beijing Normal University Beijing China department of basic courses Business College Beijing Union University Beijing China

We derive a quenched moderate deviations principle for the one-dimensional nearest random walk in random environment,where the environment is assumed to be stationary and ergodic.The approach is based on hitting time ... 详细信息

关键词： random walk in random environment moderate deviations principle hitting time

Fish forewarning of comprehensive toxicity in water environment based on Bayesian sequential method

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Journal of Environmental Sciences 2021年第12期33卷 150-159页

作者： Kaifeng Rao Li Tang Xin Zhang Heyu Xiang Liang Tang Yong Liu Wei Wang Jie Jiang Mei Ma Yiping Xu Zijian Wang State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Shenzhen Monitoring Centre of Ecology and Environment Shenzhen 518049China department of basic courses Beijing Union UniversityBeijing 100101China Faculty of Mathematics and Statistics Hubei UniversityWuhan 430062China CASA(Wuxi)Environmental Technology Co.Ltd. Wuxi 214024China college of Resources and Environment University of Chinese Academy of SciencesBeijing 101407China

Environmental impact of pollutants can be analyzed effectively by acquiring fish behavioral signals in water with biological behavior sensors. However, a variety of factors, such as the complexity of biological organisms themselves, the device error and the environmental noise, may compromise the accuracy and timeliness of model predictions. The current methods lack prior knowledge about the fish behavioral signals corresponding to characteristic pollutants, and in the event of a pollutant invasion, the fish behavioral signals are poorly discriminated. Therefore, we propose a novel method based on Bayesian sequential,which utilizes multi-channel prior knowledge to calculate the outlier sequence based on wavelet feature followed by calculating the anomaly probability of observed values. Furthermore, the relationship between the anomaly probability and toxicity is analyzed in order to achieve forewarning effectively. At last, our algorithm for fish toxicity detection is verified by integrating the data on laboratory acceptance of characteristic pollutants. The results show that only one false positive occurred in the six experiments, the present algorithm is effective in suppressing false positives and negatives, which increases the reliability of toxicity detections, and thereby has certain applicability and universality in engineering applications.

关键词： Bayesian sequential method Fish electrical signal Outlier detection Anomaly probability Time series forecasting

Photon penetration depth in human brain for light stimulation and treatment:A realistic Monte Carlo simulation study

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Journal of Innovative Optical Health Sciences 2017年第5期10卷 59-68页

作者： Ting Li Chang Xue Pengbo Wang Yan Li Lanhui Wu Institute of Biomedical Engineering Chinese Academy of Medical Science and Peking union Medical college 300192 TianjinP.R.China State Key Lab Elect Thin Film&Integrated Device and department of Biomedical Engineering university of Electronic Science&Technology of China Chengdu 610054 P.R.China Design Center Avic beijing Keeven Aviation Instrument Co. Ltd China Aviation Industry Corporation Beijing 100098P.R.China

Light has been clinically utilized as a stimulation in medical treatment,such as Low-level laser therapy and photodynamic thenapy,which has been more and more widely accepted in public.The penetration depth of the treatment light is important for precision treatment and safety control.The isue of light penetration has been highlighted in biomedical optics field for decades.However,quantitative research is sparse and even there are conflicts of view on the capability of near-infrared light penet ration into brain tissue.This study attempts to quantitatively revisit this issue by innovative high-realistic 3D Monte Caro modeling of stimulated light penetnation within high precision Visible Chinese human head.The properties of light,such as its wave-length,ilumination profle and size are concern in this study.We made stra ightforward and quantitative comparisons among the ffects by the light properties(i.e.,wavelengths:660,810 and 980 nn;beam types:Gaussi an and flat beamn;bear dianeters:0,2,4 and 6 cm)which are in the range of light treatment.The findings include about 3%of light dosage within brain tisue;the combination of Gaussian beam and 810nm light make the max imum light penetration(>5cm),which allows light to cross through gray matter into white mater.This study offered us,the first time as we know,quantitative guide for light stimulation parameter optimization in medical treatment.

关键词： Penetration depth light therapy light propagation MCVM human brain