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Global Solvability,Pattern Formation and Stability to a Chemotaxis-haptotaxis Model with Porous Medium Diffusion

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Acta Mathematica Sinica,English Series 2023年第8期39卷 1597-1623页

作者： Chun hua jin School of Mathematical Sciences South China Normal UniversityGuangzhou 510631P.R.China

In this paper,we deal with the following chemotaxis-haptotaxis system modeling cancer invasion with nonlinear diffusion,ut=Δum−χ∇·(u∇v)−ξ∇·(u∇ω)+μu(1−u−ω),inΩ×R^(+),vt−Δv+v=u,inΩ×R+,ωt=−vω,inΩ×R+,whereΩ⊂R^(N)is a bounded *** first supplement the results of global existence and uniform boundedness of solutions for the case m=2N N+*** for any m>0 and any spatial dimension,we consider the stability of equilibrium,and find that the chemotaxis has a destabilizing effect,that is for the ODEs,or the diffusion-ODE system without chemotaxis,the solutions tend to a linearly stable uniform steady state(1,1,0).When the chemotactic coefficientχis large,the equilibrium(1,1,0)become *** we study the existence of nontrivial stationary solutions via bifurcation techniques withχbeing the bifurcation parameter,and obtain nonhomogeneous *** last,we also investigate the stability of these bifurcation solutions.

关键词： Chemotaxis-haptotaxis porous medium diffusion pattern formation stability

Plasmonic Core-Shell Nanostructures Enhanced Spectroscopies

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Chinese Journal of Chemistry 2022年第3期40卷 392-406页

作者： Jun Zhou Di-Ye Wei Yu-jin Zhang hua Zhang jian-Feng Li State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyFujian Key Laboratory of Advanced MaterialsXiamen UniversityXiamenFujian 361005China College of Optical and Electronic Technology China Jiliong UniversityHangzhouZhejiang 310018China

Core-shell nanostructures constituted by a plasmonic core and an ultrathin shell have drawn enormous attentions in enhanced spectroscopies,catalysis,energy,and other fields because of their splendid properties such as multifunctionality,stability,and *** this article,we summarized the endeavors made by our group in the past decade about the core-shell nanostructures in the shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS)and plasmon-enhanced ***,the potential challenges and perspectives about core-shell nanostructures in spectroscopies have also been ***,we believe this article would provide an avenue for a comprehensive understanding of enhanced spectroscopies with core-shell nanostructures.

关键词： Raman spectroscopy Nanostructures Electrochemistry Heterogeneous catalysis In-situ characterization

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蒸汽热力系统冷凝水及乏汽回收实践与分析

节能 2011年第7期30卷 99-100,6页

作者：章建华王伟金蕴智周宇南通宝钢钢铁有限公司江苏南通226002

结合南通宝钢钢铁有限公司大电炉热力冷凝水回收系统项目,对热力系统冷凝水回收问题进行分析和探讨,对于蒸汽热力系统中冷凝水回收项目具有参考价值。

关键词：蒸汽热力系统冷凝水回收锅炉

Hepatitis B or C viral infection and risk of pancreatic cancer: A meta-analysis of observational studies

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World Journal of Gastroenterology 2013年第26期19卷 4234-4241页

作者： jian-hua Xu jin-jian Fu Xiao-Li Wang Jia-Yong Zhu Xiao-hua Ye Si-Dong Chen Department of Pathogen Biology School of Public Health and Tropical Medicine Southern Medical University Guangdong Key Laboratory of Molecular Epidemiology School of Public Health Guangdong Pharmaceutical University Institute of Pharmaceutical Bioactive Substances Research Guangdong Pharmaceutical University Department of Clinical Laboratory Guangdong Provincial Hospital of Chinese Medicine Liuzhou Municipal Maternity and Child Healthcare Hospital

AIM: To investigate if there is an association between hepatitis B virus (HBV) or hepatitis C virus (HCV) infection and the risk of pancreatic cancer. METHODS: All relevant studies published before 11 October, 2012 were identified by a systematic search of MEDLINE, EMBASE, BIOSIS Previews and the Cochrane Library databases and with cross-referencing. The observational studies that reported RR or OR estimates with 95%CIs for the association between HBV or HCV and pancreatic cancer were included. A random-effects model was used to summarize meta-analytic estimates. The Newcastle-Ottawa quality assessment scale was applied to assess the quality of the methodology in the included studies. RESULTS: A total of 8 eligible studies were selected for meta-analysis. Overall, chronic hepatitis B and inactive hepatitis B surface antigen (HBsAg) carrier state (HBsAg positive) had a significantly increased risk of pancreatic cancer with OR of 1.20 (95%CI: 1.01-1.39), especially in the Chinese population (OR = 1.30, 95%CI: 1.05-1.56). Past exposure to HBV (possible occult HBV infection) had an increased OR of pancreatic cancer risk (OR = 1.24, 95%CI: 1.05-1.42), especially among those patients without natural immunity [anti hepatitis B core (HBc) positive/hepatitis B surface antibody (anti HBs) negative], with OR of 1.67 (95%CI: 1.13-2.22). However, past exposure to HBV with natural immunity (anti-HBc positive/anti-HBs positive) had no association with pancreatic cancer development, with OR 0.98 (95%CI: 0.80-1.16), nor did the HBV active replication (hepatitis B e antigen positive status), with OR 0.98 (95%CI: 0.27-1.68). The risk of pancreatic cancer among anti-HBs positive patients was significantly lower than among anti-HBs negative patients (OR = 0.54, 95%CI: 0.46-0.62). Past exposure to HCV also resulted in an increased risk of pancreatic cancer (OR = 1.26, 95%CI: 1.03-1.50). Significant between-study heterogeneity was observed. Evidence of publication bias for HBV/HCV infecti

关键词： Hepatitis B Hepatitis C Pancreatic cancer Observational studies Meta-analysis

Application of distributed model predictive control based on neighborhood optimization in gauge-looper integrated system of tandem hot rolling

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Journal of Iron and Steel Research International 2023年第2期30卷 277-292页

作者： Jie Sun Fan Hou Yun-jian Hu Long-jun Wang Hao-yue jin Wen Peng Xiao-jian Li Dian-hua Zhang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

To solve the coupling relationship between the strip automatic gauge control and the looper control in traditional control strategy of tandem hot rolling,a distributed model predictive control(DMPC)strategy for the tandem hot rolling was explored,and a series of simulation experiments were carried ***,based on the state space analysis method,the multivariable dynamic transition process of hot strip rolling was studied,and the state space model of a gauge-looper integrated system in tandem hot rolling was ***,DMPC strategy based on neighborhood optimization was proposed,which fully considered the coupling relationship in this integrated ***,a series of experiments simulating disturbances and emergency situations were completed with actual rolling *** experimental results showed that the proposed DMPC control strategy had better performance compared with the traditional proportional-integral control and centralized model predictive control,which is applicable for the gauge-looper integrated system.

关键词： Tandem hot rolling Gauge Looper integrated system State space model Distributed model predictive control Neighborhood optimization

Thermal analysis of walls in a new-type billet caster tundish with a vacuum shell

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Journal of Iron and Steel Research International 2017年第5期24卷 501-507页

作者： jian-bo Xie jian-an Zhou Lan-hua Zhou Bao Wang hua Zhang State Key Laboratory of Refractories & Metallurgy Wuhan University of Science & Technology Wuhan 430081 Hubei China Key Laboratory of Ferrous Metallurgy and Resources Utilization Ministry of Education Wuhan University of Science & Technology Wuhan 430081 Hubei China School of Resources and Environmental Engineering Panzhihua University Panzhihua 617000 Sichuan China

To reduce thermal loss from molten steel in a tundish during continuous casting production, a new tundish fabricated by welding radiation-proof steel plates onto the steel plates of the exterior walls of a billet caster tundish was proposed. This new tundish was used to investigate the effect of pressures inside the vacuum chamber on the uniformity of the temperature of molten steel and the thermal conditions of the vacuum layer. The results show that the conversion radiation coefficient is not sensitive to pressure and its value at high temperatures is merely 1.5 times greater than that at low temperatures. Pressure is the key factor af- fecting additional factor of conversion convection. This factor is more than 100 times greater at 10-5 Pa than at 10-2 Pa, and the temperature at inner points at 10-2 Pa is, on average, 4 K higher than that at 10-5 Pa. Meanwhile, the local temperature difference of the inlet at 10-2 Pa is 1 K higher than that at 10-5 Pa. Thus, the proposed vacuum billet caster tundish can achieve low superheat teeming of steel because of the ther- mal preservation capability of the vacuum, which helps to reduce the tapping temperature and improve the uniformity of the temperature of steel.

关键词： Tundish Vacuum chamber Pressure Thermal preservation Superheat

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水环境镉对鲫鱼淋巴细胞DNA合成的影响

实用预防医学 2004年第6期11卷 1106-1107页

作者：胡晓磐周建华时夕金苏州大学放射医学与公共卫生学院江苏苏州215007

目的　探讨镉对鲫鱼淋巴细胞DNA合成的影响及其卫生学意义。　方法　鲫鱼 72尾随机分成 12组 ,每组 6尾。设 2 .5、5、10、2 0和 40 μg/L五个氯化镉染毒组 ,水环境暴露 2 4h ,另设一个阴性对照组 ;在 10 μg/L暴露条件下 ,设 12、2 4... 详细信息

目的　探讨镉对鲫鱼淋巴细胞DNA合成的影响及其卫生学意义。　方法　鲫鱼 72尾随机分成 12组 ,每组 6尾。设 2 .5、5、10、2 0和 40 μg/L五个氯化镉染毒组 ,水环境暴露 2 4h ,另设一个阴性对照组 ;在 10 μg/L暴露条件下 ,设 12、2 4、48、72和 96h五个时间效应组 ,另设一个 0时间对照组。各组在规定时间内心脏取血 0 .5ml,采用　3 H -胸腺嘧啶核苷 (　3 H -TdR)掺入法测定鲫鱼 (Carassiusauratus)淋巴细胞中　3 H -TdR掺入量 (DPM值 )。　结果　各氯化镉染毒组的DPM值明显降低 ,与阴性对照组比较 ,差异有显著性 (P <0 .0 5 ,P <0 .0 1) ;另外 ,随着镉浓度的增高 ,各剂量效应组的DPM值逐渐下降 ,在实验浓度范围内 ,存在剂量 -效应关系 (P <0 .0 1)。DPM值与作用时间无相关性。　结论　镉可引起鲫鱼淋巴细胞DNA合成受抑 ,DNA合成可望作为水体污染生物检测指标之一。

关键词：镉鲫鱼 ^3H-TdR掺入 DNA合成

Local scour by multiple slit-type energy dissipaters

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Journal of Hydrodynamics 2020年第6期32卷 1221-1224页

作者： Li Yao jian-hua Wu College of Water Conservancy and Ecological Engineering Nanchang Institute of TechnologyNanchang330099China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China

Energy dissipation and scour control are all the key issues for the design of hydraulic *** the basis of the high energy dissipation for the multiple slit-type energy dissipaters(M-STED)developed by the authors,in this work,the characteristics of the scour hole for the M-STED were experimentally investigated through three sets of those physical models with five cases and a scour hole form index was *** results show that,the M-STED results in not only the high energy dissipation but also the mild upstream slope of the scour hole thanks to the scour hole form index of larger than 0.5,which is in favor of the safety of the release works.

关键词： Energy dissipation scour scour hole form index multiple slit-type energy dissipater

Tribological properties in seawater for Ti/TiCN coatings on Ti6Al4V alloy by arc ion plating with different carbon contents

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Rare Metals 2017年第11期36卷 858-864页

作者： jin-Long Li Gang-Yi Cai hua-Sheng Zhong Yong-Xin Wang jian-Min Chen Key Laboratory of Marine Materials and Application Technologies Zhejiang Key Laboratory of Marine Materials and Protection Technologies Ningbo Institute of Materials Technologies and Engineering Chinese Academy of Sciences School of Mechanical and Electrical Engineering Henan University of Technology

TiCN coatings incorporated with Ti buffer layer were deposited on Ti6A14V alloy by arc ion plating. The carbon content in TiCN coatings was varied by controlling flow rates of C2H2 in reactive gas. The Ti/TiCN coatings have a typical structure of columnar crystal with a total thickness of about 2 pro. The elements of Ti, C and N are present as TiN and TiC in TiCN coatings. A little free carbon appears with carbon content increasing in TiCN coatings. For the TiCN coatings, the hardness, friction coefficient and wear rate decrease with the increase in carbon content. In seawater, both friction coefficient and wear rate have an obvious decrease at lower carbon content compared with those in atmosphere. However, the friction coefficient and wear rate only have a slight decrease, while the carbon content reaches or exceeds 10 at% in Ti/TiCN coatings.

关键词： Ti/TiCN coatings Arc ion plating Hardness Seawater Wear