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Permeable Steel and Its Application in Plastic-injection Mould

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 312-316页

作者： ZHOU Zhaoyao CAO Wenjiong WU zhengqiang yu Minqiang LI yuanyuan School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China

The gas in plastics mould has great influence on performance, appearance and lifespan of the injection molded parts. Venting channel and its appendix system should be used for gas exhausting in general. However, the dependence on the venting system complicates the mould design. Furthermore in certain condition, it is difficult to integrate the venting system into the mould. Currently a kind of mold material which has gas permeability has been developed in abroad, but the applications of this mold material were restricted by its higher cost and smaller size. In this research, a porous material which was made by powder metallurgy was applied to plastic mould to replace the venting system. Permeability of the steel with different secondary processing was tested and compared with a special apparatus. The metallographic samples of the steel with different secondary processing were prepared and investigated. Finally an actual injection set was established to investigate the applications of permeable steel. The metallographies indicate that the micro-holes inside permeable steel were interconnected. Moulds made of permeable steel exhibit good permeability in the plastic-injection experiments and gas generated in the mould cavity was smoothly exhausted. The melted plastic did not penetrate into the mould or block in the micro-holes. After several times of plastic-injection experiments, the mould still retained good permeability. The strength of this permeable steel is between 200–250 MPa and suitable for industrial applications. The venting systems simplified by permeable steel in plastic-injection have simple structures, which can be applied into any place that requires gas exhausting.

关键词： powder metallurgy permeable steel plastic-injection mould venting system

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相似环境下激光结合视觉的全局定位方法

中国仪器仪表 2024年第4期 60-65页

作者：黄韩宇蒋林余正强汤勃武汉科技大学冶金装备及其控制教育部重点实验室湖北武汉430081 武汉科技大学机器人与智能系统研究院湖北武汉430081

在室内结构相似或含有多几何结构重复区域的环境中,基于激光的全局定位方法很难实现可靠且高效的结果。针对该问题,本文提出一种基于优化的视觉辅助激光定位的方法,仅利用单帧图像信息和激光(LiDAR)信息进行重定位。首先,利用视觉位置... 详细信息

在室内结构相似或含有多几何结构重复区域的环境中,基于激光的全局定位方法很难实现可靠且高效的结果。针对该问题,本文提出一种基于优化的视觉辅助激光定位的方法,仅利用单帧图像信息和激光(LiDAR)信息进行重定位。首先,利用视觉位置识别和BA(Bundle Adjustment)优化来估计机器人的初始姿态。然后,利用视觉初始位姿缩小搜索空间,提高约束计算速度,并将初始估计和激光约束结合验证。最后通过稀疏姿态优化方法构建目标函数,求解全局位姿。实验结果表明,提出的全局定位方法相比单一激光全局定位具有更高的成功率,并且全局定位时间在室内小场景环境和长走廊环境分别减少了56.81%和89.43%,满足了实时性和鲁棒性要求。

关键词：全局定位视觉位置识别相似环境搜索空间

维普期刊数据库博看期刊

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以“敬畏”之心推动学校教育教学改革

中国基础教育 2024年第4期 77-77页

作者：俞正强金华师范学校附属小学

我们对学校教育还有许多不满意的地方,这是事实。因为不满意,所以要去改革,也是事实。但是,回顾我们在改革之路上遇到的挫折,从学校层面来看,我们的教育教学改革尤其需要一颗“敬畏”之心。曾经,有些学校推出教学改革成果,其核心举措是... 详细信息

我们对学校教育还有许多不满意的地方,这是事实。因为不满意,所以要去改革,也是事实。但是,回顾我们在改革之路上遇到的挫折,从学校层面来看,我们的教育教学改革尤其需要一颗“敬畏”之心。曾经,有些学校推出教学改革成果,其核心举措是取消教师上课,让学生自己教自己,这种“大胆”的做法赢得一片叫好声……但是后来,就悄无声息了。

关键词：教学改革成果学校层面改革之路教育教学改革敬畏学校教育教学上课

Effects of Aflatoxin B1 on T-Cell Subsets and Cytokines mRNA Expression in the Intestine of Broilers

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Effects of Aflatoxin B1 on T-Cell Subsets and Cytokines mRNA...

Effect of selenium supplementation on apoptosis and cell cycle blockage of renal cells in broilers fed a diet containing aflatoxin B1

第七届中国畜牧科技论坛

作者： Jiang min Peng xi Fang jing Cui hengmin yu zhengqiang Chen zhengli Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province College of Veterinary Medicine Sichuan Agricultural University

This study was conducted to investigate the effects of AFB on T-cell subsets and cytokines mRNA expression in the small intestine of *** hundred and fifty six one-day-old healthy Cobb broilers were randomly divided into control group(0 mg/kg AFB)and AFB group(0.6 mg/kg AFB) with three replicates per group and 26 birds per replicate for 21 days,*** 7,14,and 21 days of age,the duodenum,jejunum and ileum were sampled for analyzing T cell subsets(CD3+,CD3+CD4+and CD3+CD8+)by flow cytometry as well as IL-2,IL-4,IL-6,IL-10,IL-17,IFN-γ and TNF-α mRNA expression by *** percentages of T-cell in the intra-epithelial lymphocytes(IELs) and lamina propria lymphocytes(LPLs) of duodenum,jejunum and ileum in the AFB group showed a decreased tendency in comparison to the control *** mRNA expression of cytokines in the three intestinal segments in the AFB group presented a general decline compared with the control *** data demonstrated that 0.6 mg/kg AFB in broilers diet could reduce the percentages of T-cell subsets and the expression level of cytokines mRNA in the small intestine,implying that the immune function of the intestinal mucosa might be *** reduction of cytokines mRNA expression may be closely associated with the decreased proportions of T cells subsets induced by AFB.

关键词： aflatoxin B1 T-cell subsets cytokine intestinal mucosal immunity broilers

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Effect of selenium supplementation on apoptosis and cell cyc...

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

第七届中国畜牧科技论坛

作者： yu zhengqiang Wang fengyuan Liang na Wang chuhan Peng xi Fang jing Cui hengmin Jameel muhammad Lai weimin Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province College of Veterinary MedicineSichuan Agricultural University

The aim of the study was to investigate the competency of selenium(Se) in counteracting the adverse effects of aflatoxin B(AFB) on apoptosis,cell cycle and proliferation of nephritic cells.240,one-day-old healthy male avian broilers were randomly divided into four groups and fed with basal diet(control group),0.3 mg/kg AFB diet(AFB group),0.4 mg/kg Se diet(+ Se group) and 0.3 mg/kg AFB +0.4 mg/kg Se diet(AFB + Se group),*** to the control group,the number of apoptotic renal cells,expressions of Bax and Caspase-3 mRNA were significantly increased,while the expression of Bcl-2 was significantly decreased in AFBand+Se groups(P<0.01).A significant decreased proliferating cell nuclear antigen(PCNA) expression and arrested G/G phases of the cell cycle were also seen in the AFB and + Se groups when compared with those of the control ***,these parameters were restored to control group levels in the AFB + Se *** results suggested that sodium selenite supplied in the diet,could effectively inhibit AFB-induced apoptosis and cell cycle blockage in renal cells of broiler.

关键词： Aflatoxin B1 Selenium Renal cell Apoptosis Cell Cycle Broiler

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： WANG yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality

The mitochondrial and death receptor pathways involved in the thymocytes apoptosis induced by aflatoxin B1

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The mitochondrial and death receptor pathways involved in th...

Topological Stability and Entropy for Certain Set-valued Maps

第七届中国畜牧科技论坛

作者： Peng xi yu zhengqiang Liang na Chi xiaofeng Li xiaochong Jiang min Fang jing Cui hengmin Lai weimin Zhou yi Zhou shan Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province College of Veterinary MedicineSichuan Agricultural University

Aflatoxin B(AFB) is a potent immunosuppressive agent in endotherms,which can be related to the up-regulated apoptosis of immune *** this study,we investigated the roles of the mitochondrial,death receptor,and endoplasmic reticulum pathways in Aflatoxin B induced thymocytes *** were fed an aflatoxin B containing diet(0.6 mg/kg AFB]) for 3 *** results showed that(1) AFB diet induced the decrease of T-cell subsets,morphological changes,and excessive apoptosis of thymus.(2) The excessive apoptosis involved the mitochondrial pathway(up-regulation of Bax,Bak,cytC and downregulation of Bcl-2 and Bcl-xL) and death receptor pathway(up-regulation of FasL,Fas and FADD).(3) Oxidative stress,an apoptosis inducer,was confirmed in the *** conclusion,this is the first study to demonstrate that mitochondrial and death receptor pathways involved in AFB induced thymocytes apoptosis in broilers.

关键词： aflatoxin B1 thymocytes apoptosis signaling pathways broilers

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Acta Mathematica Sinica,English Series 2024年第4期40卷 962-984页

作者： yu ZHANG yu Jun ZHU School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

In this paper,the dynamics(including shadowing property,expansiveness,topological stability and entropy)of several types of upper semi-continuous set-valued maps are mainly considered from differentiable dynamical systems points of *** is shown that(1)if f is a hyperbolic endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has theε-shadowing property,and moreover,if f is an expanding endomorphism then there exists a C^(1)-neighborhood U of f such that the induced set-valued map F_(f,U)has the Lipschitz shadowing property;(2)when a set-valued map F is generated by finite expanding endomorphisms,it has the shadowing property,and moreover,if the collection of the generators has no coincidence point then F is expansive and hence is topologically stable;(3)if f is an expanding endomorphism then for eachε>0 there exists a C^(1)-neighborhood U of f such that h(F_(f,U,ε))=h(f);(4)when F is generated by finite expanding endomorphisms with no coincidence point,the entropy formula of F is ***,the dynamics of the set-valued maps based on discontinuous maps on the interval are also considered.

关键词： Set-valued map orbit space hyperbolic endomorphism perturbation shadowing expansiveness topological stability entropy

A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

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Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi yu Tao yu Jian-Hua Ye State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initially called the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental results observed in this study were different from those of traditional batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental ***, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was also studied by using *** results indicated that the proposed adsorption model can fit the experimental data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)