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Chinese Journal of Chemical Engineering 2016年第9期24卷 1290-1297页

作者： Fenglei Bi jianqiang shao Zhenhao Xi Ling Zhao Di Liu Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Beijing Sanlian Hope Shin-Gosen Technical Service Co. Ltd.

Poly（m-xylylene adipamide）/poly（ethylene terephthalate）（MXD6/PET） copolymers are synthesized by melt copolycondensation with 1–5 wt% low molecular weight PET oligomers into the MXD6 oligomers at 260 ℃.FR-IR and1 H NMR analysis results indicate that the interchange reaction has occurred between MXD6 oligomers and PET oligomers. The thermal behavior of copolymers shows that the melting temperature of MXD6/PET copolymers decreases with the increasing of amount of PET oligomers, while the crystallization temperature accordingly increases. And the equilibrium temperature Tm0 is evaluated to be 251.8 ℃ for the copolymers with5 wt% PET oligomer adding, which is very close to that of neat MXD6. The tensile and impact strength of MXD6/PET copolymers are significantly improved than that of pure MXD6 by mechanical properties test, and the microfibril structure in the impact fracture sample＇s surface reveals the feature of ductile fracture.

关键词： Polymerization Poly(m-xylylene adipamide) Poly(ethylene terephthalate) Crystallization Mechanical properties

银杏叶提取物诱导乳腺癌MCF-7细胞线粒体自噬的机制研究

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国际肿瘤学杂志 2024年第2期51卷 65-72页

作者：邵建强王鹏白杰李会欣王遵义徐志宏河北省沧州市中心医院甲状腺乳腺外科沧州061000

目的探讨银杏叶提取物(EGB)对乳腺癌MCF-7细胞线粒体自噬的作用机制。方法将乳腺癌MCF-7细胞株分为4组,使用质量浓度为40、80、120 mg/L的EGB分别作用于乳腺癌MCF-7细胞株,培养24或48 h,作为EGB低浓度组、EGB中浓度组、EGB高浓度组,另... 详细信息

目的探讨银杏叶提取物(EGB)对乳腺癌MCF-7细胞线粒体自噬的作用机制。方法将乳腺癌MCF-7细胞株分为4组,使用质量浓度为40、80、120 mg/L的EGB分别作用于乳腺癌MCF-7细胞株,培养24或48 h,作为EGB低浓度组、EGB中浓度组、EGB高浓度组,另取未干预的乳腺癌MCF-7细胞作为对照组。MTT法测定细胞增殖;流式细胞仪检测细胞凋亡;免疫荧光法测定核孔蛋白(P62)、微管相关蛋白轻链3Ⅱ(LC3Ⅱ)、胱天蛋白酶-3(caspase-3)含量;PCR仪检测多药耐药相关蛋白1(MRP1)、多药耐药基因1(MDR1)及乳腺癌耐药蛋白(BCRP)mRNA水平;蛋白质印迹法检测细胞胞外信号激酶(ERK)、丝裂原活化蛋白激酶(MAPK)、p-ERK、p-MAPK蛋白表达。结果MTT法测定细胞增殖结果表明,对照组,EGB低、中、高浓度组24 h细胞增殖分别为0.95±0.14、0.65±0.09、0.51±0.07、0.37±0.04,差异有统计学意义(F=43.13,P<0.001);48 h细胞增殖分别为1.32±0.19、0.54±0.08、0.32±0.05、0.15±0.02,差异有统计学意义(F=141.30,P<0.001);与24 h比较,EGB低、中、高浓度组48 h细胞增殖均降低(均P<0.05)。两两比较发现,EGB处理显著降低了MCF-7细胞活力,对照组,EGB低、中、高浓度组24、48 h细胞增殖均依次降低(均P<0.05)。流式细胞术检测发现,对照组,EGB低、中、高浓度组乳腺癌MCF-7细胞凋亡率分别为2.12%±0.23%、9.28%±0.45%、15.17%±1.28%、22.21%±2.32%,差异有统计学意义(F=128.80,P<0.001)。两两比较发现,对照组,EGB低、中、高浓度组细胞凋亡率依次升高(均P<0.05)。免疫荧光法测定结果显示,对照组,EGB低、中、高浓度组乳腺癌MCF-7细胞P62蛋白相对表达量分别为3.34±0.52、2.85±0.47、2.02±0.18、1.08±0.21,差异有统计学意义(F=41.55,P<0.001);LC3Ⅱ蛋白相对表达量分别为0.24±0.05、1.02±0.14、1.47±0.26、1.95±0.21,差异有统计学意义(F=94.82,P<0.001);caspase-3蛋白相对表达量分别为0.25±0.03、0.68±0.21、1.12±0.17、1.65±0.23,差异有统计学意义(F=68.09,P<0.001)。两两比较发现,对照组,EGB低、中、高浓度组LC3Ⅱ、caspase-3蛋白表达量依次升高,而P62蛋白表达量依次降低(均P<0.05)。PCR实验结果显示,对照组,EGB低、中、高浓度组乳腺癌MCF-7细胞MRP1 mRNA水平分别为1.06±0.14、0.83±0.18、0.71±0.11、0.52±0.08,差异有统计学意义(F=17.41,P<0.001);MDR1 mRNA水平分别为1.14±0.17、0.75±0.13、0.60±0.09、0.48±0.06,差异有统计学意义(F=34.40,P<0.001);BCRP mRNA水平分别为1.09±0.11、0.88±0.13、0.69±0.07、0.57±0.05,差异有统计学意义(F=34.13,P<0.001)。两两比较发现,对照组,EGB低、中、高浓度组MRP1、MDR1、BCRP mRNA水平均依次降低(均P<0.05)。蛋白质印迹法检测结果表明,对照组,EGB低、中、高浓度组乳腺癌MCF-7细胞ERK表达分别为2.54±0.38、1.89±0.25、1.55±0.21、1.12±0.16,差异有统计学意义(F=31.18,P<0.001);MAPK表达分别为2.47±0.34、1.96±0.29、1.63±0.27、1.20±0.24,差异有统计学意义(F=20.90,P<0.001);p-ERK表达分别为2.03±0.29、1.74±0.21、1.45±0.11、1.18±0.24,差异有统计学意义(F=16.31,P<0.001);p-MAPK表达分别为2.26±0.47、1.90±0.41、1.61±0.33、1.35±0.16,差异有统计学意义(F=7.01,P=0.002)。两两比较发现,对照组,EGB低、中、高浓度组细胞ERK、MAPK、p-ERK、p-MAPK表达均依次降低(均P<0.05)。结论EGB可抑制乳腺癌MCF-7细胞增殖,促进MCF-7细胞凋亡,降低P62蛋白表达,升高LC3Ⅱ、caspases-3蛋白表达,诱导细胞线粒体自噬。

关键词：银杏叶提取物乳腺癌细胞线粒体自噬胞外信号调节激酶丝裂原活化蛋白激酶

Election Spin Resonance Studies of Free Radical Formation and Oxygen Consumption of Lens Epithelium During Ultraviolet Exposure

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眼科学报 1993年第1期9卷 15-18页

作者： Jiemin Xu CunpuSun Ke Wu jianqiang shao Qing Shan Jianbo Cong Jianzhong Zhang Beijing Institute of Radiation Medicine Beijing 100850China Graduate School Academia Sinica

A long life election spin resonance (ESR) signal at g=2.0006 was observed in the normal lens epithelium and cortical fibers. During ultraviolet (UV) exposure, a new ESR signal at g = 2.0060 was found in the lens epithelium. But this specific signal was not detected in the lens cortical fibers. This suggested that lens epithelial cells were more susceptible to the free radical formation which was induced by UV light. By means of ESR spin probe oxymetry, the oxygen uptake of lens epithelial cells was meas...

关键词： election spin resonance(ESR) lens epithelium free radical oxygen consumption ultraviolet(UV)exposure

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垃圾焚烧炉热力计算拓扑模型优化

工业炉 2024年第3期46卷 37-41页

作者：史焕明李德胜邵建强孙敦冠彭鹏梁爽光大环保(中国)有限公司光大环保能源(宜兴)有限公司华南理工大学电力学院

针对垃圾焚烧炉内传热复杂的现象，提出多区域热力计算拓扑模型，并在某850 t/h垃圾发电厂进行热力计算验证。结果表明：拓扑模型计算得到的烟温误差均小于5℃，小于传统的古尔维奇零维模型和三分区模型；热值和热负荷的增大，会提升烟... 详细信息

针对垃圾焚烧炉内传热复杂的现象，提出多区域热力计算拓扑模型，并在某850 t/h垃圾发电厂进行热力计算验证。结果表明：拓扑模型计算得到的烟温误差均小于5℃，小于传统的古尔维奇零维模型和三分区模型；热值和热负荷的增大，会提升烟气温度，但在高温过热器入口处烟气温度依然在580℃以下，在设计烟温范围内；分区模型的建立能够进一步优化锅炉内温度场的误差精度，可为垃圾焚烧炉的设计及参数优化提供理论基础。

关键词：余热锅炉垃圾焚烧炉热力计算拓扑分区模型烟气温度

基于非线性回归耦合组合赋权法的垃圾焚烧发电厂布袋除尘器健康评价模型

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广东化工 2024年第18期51卷 142-145页

作者：史焕明李德胜孙敦冠邵建强陈轶涛陈飞李伟杰光大环保(中国)有限公司广东深圳518000 光大环保能源(宜兴)有限公司江苏宜兴214200 华南理工大学电力学院广东广州510640

垃圾焚烧发电除尘设备运行状况的健康评价可为布袋除尘器可靠运行提供有力保障。本文耦合运行压差、出口粉尘浓度、烟气温度为基础评价指标,并充分考虑布袋泄漏的影响,建立了基于动态理想运行压差的布袋健康评价模型。以某垃圾焚烧发电... 详细信息

垃圾焚烧发电除尘设备运行状况的健康评价可为布袋除尘器可靠运行提供有力保障。本文耦合运行压差、出口粉尘浓度、烟气温度为基础评价指标,并充分考虑布袋泄漏的影响,建立了基于动态理想运行压差的布袋健康评价模型。以某垃圾焚烧发电厂除尘设备为研究对象,采用该模型发现该布袋除尘器在过滤周期内健康指数变化趋势基本上由运行压差分值变化所决定,健康指数呈下降趋势,且7个月内月健康指数从86.17降低到78.64分,模型还可对健康状况做出预测。

关键词：布袋除尘器健康评价非线性回归组合赋权法垃圾焚烧发电厂

Topologically Correct Intersection Curves of Two Trimmed Quadrics with Tolerance Control

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Journal of Systems Science & Complexity 2024年第5期37卷 2207-2239页

作者： shao Wenbing CHEN Falai Department of Mathematics University of Science and Technology of China

Surface/surface intersection is a fundamental problem in Compute Aided Design and Geometric Modeling since it is essential to solid modeling, numerically controlled machining, feature recognition, computer animation, etc. In practical applications, quadric surfaces, which are the most basic type of surfaces, are typically bounded surfaces trimmed by a sequence of planes. In this paper,a robust algorithm is proposed for computing the intersection curve segments of two trimmed quadrics based on the parametric representation of the intersection curves of two quadrics. The proposed algorithm guarantees correct topology and ensures that the approximation errors of the end points of the intersection curve segments are less than a given tolerance. The error control is based on an effective solution to a set of polynomial inequality system using the root isolation technique. Some examples are presented to validate the robustness and effectiveness of the proposed algorithm.

关键词： Polynomial inequality system root isolation surface/surface intersection tolerance control trimmed quadrics

Pseudoeffective thresholds and cohomology of twisted symmetric tensor fields on irreducible Hermitian symmetric spaces

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Science China Mathematics 2024年第11期67卷 2433-2452页

作者： Feng shao Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences

Let X be an irreducible Hermitian symmetric space of compact type(IHSS for short).In this paper,we give the irreducible decomposition of *** a by-product,we give a cohomological characterization of the rank of ***,we introduce pseudoeffective thresholds to measure the bigness of tangent bundles of smooth complex projective varieties precisely and calculate them for irreducible Hermitian symmetric spaces of compact type.

关键词： tangent bundle pseudoeffective threshold irreducible Hermitian symmetric space of compact type (IHSS) multiplicity free action

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Analysis of spatial distribution characteristics and driving factors of ethnicminority villages in China using geospatial technology and statistical models

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Journal of Mountain Science 2024年第8期21卷 2770-2789页

作者： shao Dandan ZOH Kyungjin Interdisciplinary Program in Landscape Architecture Graduate School of Environmental StudiesSeoul National UniversitySeoul 08826Korea Graduate School of Environmental Studies Seoul National UniversitySeoul 08826Korea

This study aims to reveal the spatial structural characteristics of 1,652 Ethnic-Minority Villages(EMV)in China and to analyze the mechanisms driving their spatial *** are a special type of settlement space that preserve a large number of historical traces of the ethnic culture of ancient *** are important carriers of China’s excellent traditional culture and are key to the implementation of rural revitalization *** this study,1652 EMV in China were selected as the research *** Nearest Neighbor Index,kernel density,and spatial autocorrelation index were employed to reveal the spatial structural characteristics of minority *** network models,spatial lag models,and geographical detectors were used to analyze the formation mechanism of spatial heterogeneity in *** results indicate that:(1)EMV exhibit significant spatial differentiation characterized by“single-core with multiple surrounding sub-centers,”“polarization between east and west,”“decreasing quantity from southwest to east coast to northeast to northwest,”and“large dispersion with small agglomeration.”(2)EMV are mainly distributed in areas rich in intangible cultural heritage,with high vegetation coverage and low altitude,far from central cities,and having limited arable land and an underdeveloped economy and transportation,particularly in shaded or riverbank areas.(3)Distance from the nearest river(X3),distance from central cities(X8),national intangible cultural heritage(X9),and NDVI(X10)were the main driving factors affecting the spatial distribution of EMV,whereas elevation(X1)and GDP(X5)had the weakest *** EMV are a relatively unique territorial spatial unit,the identification of their spatial heterogeneity characteristics not only deepens the research content of settlement geography,but also involves the assessment,protection,and development of Minority Villages,which is of great significance for the inheritance and utilization of excellent

关键词： Ethnic-Minority Villages Spatial structure Settlement geography Neural network model Spatial econometric model GeoDetector

Fear and delay effects on a food chain system with two kinds of different functional responses

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International Journal of Biomathematics 2024年第3期17卷 89-122页

作者： Yuanfu shao College of Science Guilin University of Technology GuilinGuangci 541004P.R.China

For food chain system with three populations,direct predation is the basic interaction between *** species often have different predation functional responses,so a food chain system with Holling-II response for middle predator and Beddinton-DeAngelis response for top predator is *** from direct predation,predator population can significantly impact the survival of prey population by inducing the prey's fear,but the impact often possesses a time *** paper is concentrated to explore how the fear and time delay affect the system stability and the species *** use of Lyapunov functional method and bifurcation theory,the positiveness and boundedness of solutions,local and global behavior of species,the system stability around the equilibrium states and various kinds of bifurcation are ***,some simulations are carried out to validate the main findings and the critical values of the bifurcation parameters of fear and conversion rate are *** is observed that fear and delay can not only stabilize,but also destabilize the system,which depends on the magnitude of the fear and *** system varies from unstable to stable due to the continuous increase of the prey's fear by middle *** fear induced by top predator or small delay of the prey's fear can stabilize the system,while they are sufficiently large,the system stability is to be ***,the conversion rate can also change the stability and even make the species to be *** rich dynamics like multiple stabilities and various types of bistability behaviors are also exhibited,which results in the convergence of the species from one stable equilibrium to another.

关键词： Fear functional response equilibrium bifurcation analysis bi-stability

Layered double hydroxides functionalization toward rechargeable batteries Author links open overlay panel

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Particuology 2024年第8期91卷 138-154页

作者： Jianxiong Gao Bowen Jin Mingfei shao State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China Renewable Energy Research Institute Quzhou Institute for Innovation in Resource Chemical EngineeringQuzhou324000China

Layered double hydroxides(LDHs),known as typical two-dimensional materials with unique physicochemical properties,are regarded as promising candidates in energy storage ***,some inherent defects,such as poor conductivity and limited active sites,hinder the further development of ***,various functionalization strategies(e.g.,intercalation of guest molecules;metal ions doping and defect introduction of host layer;exfoliation to monolayer;hybridization with functional materials;construction of hierarchical structure;interface engineering and phase transformation)have been used to modify the characteristics of LDHs,which provides guidance for designing novel *** this review,we discuss how these strategies improve the properties of LDH-based materials,which are expected to possess high electronic and ionic conductivity,high specific surface area and high mechanical and chemical stability ***,the application of LDH-based materials in advanced energy conversion and storage techniques,including metal-ions batteries,lithium-sulfur batteries and metal-air batteries,have been comprehensively summarized.

关键词： Layered double hydroxide Functionalization strategy Rechargeable battery