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A Note on the Hoffman-Wielandt Theorem for Generalized Eigenvalue Problems

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 167-170页

作者： xiao-shan Chen wen li School of Mathematical Sciences South China Normal University Guangzhou 510631 China

Let {A, B} and {C, D} be diagonalizable pairs of order n, i.e., there exist invertible matrices P, Q and X, Ysuchthat A = P∧Q, B = PΩQ, C =XГY, D= X△Y, where∧ = diag（α1, α2, …, αn）, Ω= diag（βl, β2, …βn）,Г=diag（γ1,γ2,…,γn）, △=diag（δl,δ2,…,δn）.Let ρ（（α,β）, （γ,δ））=｜αδ-βγ｜/√｜α｜^2＋｜β｜^2√｜γ｜^2＋｜δ｜^*** this paper, it will be proved that there is a permutation τ of {1,2,... ,n} such thatn∑i=1[ρ（（αi,βi）,（γτ（i）,δτ（i）））]^2≤n[1-1/κ^2（Y）κ^2（Q）（1-d2F（Z,W）/n）],where κ（Y） = ｜｜Y｜｜2｜｜Y^-1｜｜2,Z= （A,B）,W= （C, D） and dF（Z,W） = 1/√2｜｜Pz＊ -Pw＊｜｜F.

关键词： Generalized eigenvalue chordal metric Frobenius norm diagonalizable pair

Effects of polar cortical cytoskeleton and unbalanced cortical surface tension on intercellular bridge thinning during cytokinesis

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Acta Mechanica Sinica 2011年第6期27卷 1081-1090页

作者： li Wang Mei-wen An xiao-Na li Fang Yang Yang liu Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology 030024 Taiyuan China

To probe the contributions of polar cortical cytoskeleton and the surface tension of daughter cells to intercellular bridge thinning dynamics during cytokinesis,we applied cytochalasin D（CD） or colchicine（COLC） in a highly localized manner to polar regions of dividing normal rat kidney（NRK） *** observed cellular morphological changes and analyzed the intercellular bridge thinning trajectories of dividing cells with different polar cortical *** blebbistatin（BS） application was used to obtain cells losing active contractile force *** results show that locally released CD or colchicine at the polar region caused inhibition of cytokinesis before *** treatment at phases after ingression allowed completion of cytokinesis but dramatically influenced the trajectories of intercellular bridge *** single polar cortical actin induced transformation of the intercellular bridge thinning process,and polar cortical tension controlled deformation time of intercellular *** study provides a feasible framework to induce and analyze the effects of local changes in mechanical properties of cellular components on single cellular cytokinesis.

关键词： Cytokinesis Normal rat kidney epithelial cells Intercellular bridge Polar cortical cytoskeleton - Cortical surface tension

Plasma Homocysteine and Gene Polymorphisms Associated with the Risk of Hyperlipidemia in Northern Chinese Subjects

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Biomedical and Environmental Sciences 2008年第6期21卷 514-520页

作者： LEI HUANG xiao-MING SONG wen-li ZHU YONG li Department of Nutrition and Food Hygiene School of Public Health Peking University Beijing 100083 China

Objective To examine the relationship between occurrence of hyperlipidemia, plasma homocysteine and polymorphisms of methylenetetra hydrofolate reductase （MTHFR） gene and methionine synthase （MS） gene. Methods A total of 192 hyperlipidemia patients were selected and divided into hypercholesterolemia group, hypertriglyceridemia group, and combined hyperlipidemia group. Another 208 normal individuals were selected as control. Total plasma homocysteine （tHcy） concentration was measured by high-performance liquid chromatography （HPLC）. lipid profiles were measured for all subjects The polymorphisms of MTHFR gene C677T and MS gene A2756G were analyzed by PCR-RFLP. Results The tHcy concentration in the combined hyperlipidemia patients was significantly higher than that in the control （15.95μmol/L vs 13.43 μmol/L, P〈0.05）. The prevalence of hyperhomocysteinemia （HHcy） in the combined hyperlipidemia group was significantly higher than that in the control （42.2% vs 23.0%, P=0.015）, with the odds ratio （OR） of 3.339 （95%CI： 1.260-8.849）. The hyperlipidemia patients with HHcy had a higher concentration of total cholesterol （TC） than that in the normal tHcy patients （5.67±0.95 mmol/L vs 5.47±0.92 retool/L, P=0.034）. There was no significant difference in genotype or allele frequencies of MTHFR C677T between the hyperlipidemic and control groups. The hyperlipidemia patients with MTHFR CT/TT genotype had a higher concentration of triglyceride （TG） than those with CC genotype （2.24±1.75 mmol/L vs 1.87±0.95 mmol/L, P〈0.05）. Individuals with CT/TT genotype had a higher concentration of tHcy than those with 677CC genotype both in the hyperlipidemia group （12.61±1.24μmol/L vs 11.20±1.37 μmol/L, P〈0.05） and in the control group （14.04±1.48 μmol/L vs 12.61±1.24 μmol/L, P〈0.05）. The percentage of MS 2756 GG/AG genotype in the combined hyperlipidemia group was significantly higher than that in the control （26.7% vs 13.0%, P=0.012）, with the OR of 3.121 （95%C1： 1.288-7.65/）. The hyperlipid

关键词： Methylenetetra hydrofolate reductase Methionine synthase Gene polymorphism Homocysteine Hyperlipidemia

Expression of MAPK1 in cervical cancer and effect of MAPK1 gene silencing on epithelial-mesenchymal transition,invasion and metastasis

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Asian Pacific Journal of Tropical Medicine 2015年第11期8卷 915-921页

作者： xiao-wen li Muyasier Tuergan Guzhalinuer Abulizi No.6 Department of Gynecology Affiliated Cancer Hospital of Xinjiang Medical University No.5 Department of Gynecology Affiliated Cancer Hospital of Xinjiang Medical University

Objective:To discuss the expression of mitogen-activated protein kinase 1(MAPK1) in the cervical cancer and effect of MAPK1 gene silencing on epithelial-mesenchymal transition and invasion and ***:Immunohistoehemistry,western blot and RT-PCR method were employed to detect the expression of MAPKl protein and mRNA in cervical cancer tissue and adjacent normal *** constructed siRNA-MAPKI was transferred into human cervical cancer HeLa cells using lipofectamine^(?)*** method was used to detect the cell vitality,transwell method to detect the cell invasion,and western blot to detect the expression of matrix metalloproteinases(MMP)-2,MMP-9,tissue inhibitor of metalloproteinase(TIMP)-1,TIMP-2,zinc finger transcription factor(Snail),epithelialmesenchymal transition related protein(EMT) E-cadherin and vimentin in ***:The expression of MAPKl protein and mRNA in the cervical cancer tissue was significantly higher than the one in the adjacent normal tissue(Pliposome,compared with the control group,its cell vitality was significantly decreased(P<0.01),cell invasion was significantly decreased(P<0.01);expressed of ***-9,Snail and vimentin was significantly decreased(P<0.01),and expression of TIMP-1,TIMP-2 and E-cadherin was significantly increased(/J<0.01).Conclusions:Because of the high expression of MAPKl in the cervical cancer tissue,the interference in the expression of MAPK1 can significantly inhibit the invasion and metastasis of cervical cancer HeLa cells,which is related to the interference in the expression of MMPs/TIMP and Snail-mediated generation of EMT.

关键词： MAPK1 Cervical cancer Invasion Metastasis Epitheli

Electron-Ion Coupling Mechanism to Construct Stable Output Performance Nanogenerator

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Research 2021年第1期2021卷 1123-1134页

作者： Yan-Yuan Ba Jing-Fu Bao Xin-Tian liu xiao-wen li Hai-Tao Deng Dan-liang wen xiao-Sheng Zhang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

Recently,triboelectric nanogenerators(TENGs)have been promoted as an effective technique for ambient energy harvesting,given their large power density and high energy conversion ***,traditional TENGs based on the combination of triboelectrification effect and electrostatic induction have proven susceptible to environmental influence,which intensively restricts their application ***,a new coupling mechanism based on electrostatic induction and ion conduction is proposed to construct flexible stable output performance TENGs(SOP-TENGs).The calcium chloride doped-cellulose nanofibril(CaCl_(2)-CNF)film made of natural carrots was successfully introduced to realize this coupling,resulting from its intrinsic properties as natural nanofibril hydrogel serving as both triboelectric layer and *** coupling of two conductive mechanisms of SOP-TENG was comprehensively investigated through electrical measurements,including the effects of moisture content,relative humidity,and electrode *** contrast to the conventional hydrogel ionotronic TENGs that require moisture as the carrier for ion transfer and use a hydrogel layer as the electrode,the use of a CaCl_(2)-CNF film(i.e.,ion-doped natural hydrogel layer)as a friction layer in the proposed SOP-TENG effectively realizes a superstable electrical output under varying moisture contents and relative humidity due to the compound transfer mechanism of ions and *** new working principle based on the coupling of electrostatic induction and ion conduction opens a wider range of applications for the hydrogel ionotronic TENGs,as the superstable electrical output enables them to be more widely applied in various complex environments to supply energy for low-power electronic devices.

关键词： moisture electrostatic coupling

Development of the Embedded Protective Device Based on ARM

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Journal of China University of Mining and Technology 2005年第4期15卷 344-347页

作者： liU xiao-wen li Na PAN Chun-de School of Information ＆ Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

An embedded protective device for 35kV power line is worked out based on Philips’ LPC2292 ARM MCU. Several aspects such as embedded design technique adopted in the system framework, application of adaptive theory in data acquisition, Board Support Packet (BSP) developing and task dispatching related to operating system are discussed. Both hardware and software framework of the system are given. Advanced hardware platform and software development environment is applied in design of the system, with the advanced co-design technology.

关键词： microcomputer protective device ARM embedded operating system adaptive theory BSP

Silver dressing in the management of an infant's urachal anomaly infected with methicillin-resistant Staphylococcus aureus:A case report

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World Journal of Clinical Cases 2022年第8期10卷 2629-2636页

作者： Ze-Yao Shi Shu-lin Hou xiao-wen li Department of Neonatology Nursing West China Second University HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina West China School of Nursing Sichuan UniversityChengdu 610041Sichuan ProvinceChina Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationChengdu 610041Sichuan ProvinceChina

BACKGROUND Symptomatic urachal anomalies are rare *** management of urachal remnants has historically been surgical excision because of the connection between urachal remnants and risk of malignancy development later in ***,recent literature suggests that urachal anomalies that do not extend to the bladder can be treated with conservative *** this case,we report a newborn with an infected urachal remnant who was treated with a combination of antibiotics and a silver-based dressing and finally recovered *** SUMMARY Female baby A,weighing 2.88 kg at 38^(+5) wk of gestational age,was referred to the hospital because of a red,swollen umbilicus approximately 2 cm×2 cm in size with yellow purulent *** physical and ultrasound examination,the baby was finally diagnosed with a urachal *** first used oxacillin to prevent infection for 3 *** the 4^(th) day,microbiology testing of the umbilical exudate revealed the presence of methicillin-resistant Staphylococcus aureus(MRSA).We changed the treatment with oxacillin to vancomycin for systemic infection and treated the umbilical inflammation with a silver sulfate *** 5 d,the symptoms of the umbilicus disappeared,and we discontinued silver dressing *** the 12^(th) day,umbilical exudate testing was negative for *** the 14^(th) day,the baby's blood testing showed a white blood cell count of 14.7×10^(9)/L,neutrophil percentage of 27.8%,and C-reactive protein level of 1.0 mg/L,suggesting that the infection had been *** stopped treatment,and the baby was discharged with no *** this case,the infected urachal anomaly was cured with silver dressing and antibiotic application instead of surgical methods,which was a different course from that of some other urachal remnant *** Anomalies that do not connect with the bladder can be treated with nonoperative management,including application of conservative antibiotics and local i

关键词： Urachal anomaly Infection Neonate Infant Silver dressing Case report

A new phenanthraquinone from the roots of Peucedanum praeruptorum

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Chinese Chemical Letters 2010年第7期21卷 816-817页

作者： Cun Zhang li li Yong Qing xiao wen li xiao Jie Yin Guo Fang Tian Dong Dong Chen Yun Wang Institute of Chinese Materia Madica China Academy of Traditional Chinese MedicineBeijing 100700China

A new compound,9,10-dihydrophenanthrinic acid,9,10-dione-3,4-methylenedioxy-8-methoxy（1） was isolated from the roots of Peucedanum praeruptorum Dunn on the basis of spectral evidences.

关键词： Peucedanum praeruptorum 9 10-Phenanthraquinone 9 10-Dihydrophenanthrinic acid 9 10-Dione-3 4-methylenedioxy-8-methoxy

Experimental system of coupled map lattices

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Frontiers of physics 2015年第3期10卷 101-104页

作者： Yu-Han Ma Lan-Qing Huang Chu-Min Sun xiao-wen li Department of Physics Beijing Normal University Beijing 100875 China

We design an optical feedback loop system consisting of a liquid-crystal spatial light modulator （SLM）, a lens, polarizers, a CCD camera, and a computer. The system images every SLM pixel onto one camera pixel. The light intensity on the camera pixel shows a nonlinear relationship with the phase shift applied by the SLM. Every pixel behaves as a nonlinear map, and we can control the interaction of pixels. Therefore, this feedback loop system can be regarded as a spatially extended system. This experimental coupled map has variable dimensions, which can be up to 512 by 512. The system can be used to study high-dimensional problems that computer simulations cannot handle.

关键词： coupled map lattices photoelectric feedback loop