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《高分子物理》课程中交联相关知识的模块化教学

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高分子通报 2024年第5期37卷 707-712页

作者：艾娇艳刘保华宋丽娜赵晨广东工业大学材料与能源学院广州510006

本文以交联概念为核心,交联限制分子运动为桥梁,抓住结构通过分子运动决定性能这一主线,重构高分子物理与交联相关的知识体系,将相关的知识串联成一个知识模块进行串讲和归纳;培养学生对高分子体系的思维逻辑,指导学生更好地掌握高分子... 详细信息

本文以交联概念为核心,交联限制分子运动为桥梁,抓住结构通过分子运动决定性能这一主线,重构高分子物理与交联相关的知识体系,将相关的知识串联成一个知识模块进行串讲和归纳;培养学生对高分子体系的思维逻辑,指导学生更好地掌握高分子物理的重要知识。这种教学方法使学生对知识融会贯通,深入理解聚合物结构的多层次性以及结构与性能之间的内在规律,并将高分子物理的基本概念和理论用于解决实际的工程问题。

关键词：高分子物理交联模块化教学

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Microstructural refinement and performance improvement of Cu-36 wt%Zn alloy by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring

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Rare Metals 2022年第10期41卷 3560-3565页

作者： Ya-Bo Fu Yi-Ping Lu Zhi-Jun Wang Zhi-Qiang Cao ai-jiao Xu School of Physics and Electronic Engineering Taizhou UniversityTaizhou318000China School of Materials Science and Engineering Dalian University of TechnologyDalian116024China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an710048China

Cu-36 wt%Zn alloy is widely used in valves of water and heating and auto parts,***,the structure is still coarse,and performances are much *** structure and performances of Cu-36 wt%Zn alloy were investigated by adding Al_(2)O_(3)nanoparticles and *** indicate that by Al_(2)O_(3)nanoparticles coupling electromagnetic stirring,the Cu-36 wt%Zn alloy with refined microstructure was successfully *** average grain size is refined by 99%compared with that without nanoparticles and *** tensile strength(R_m)and percentage elongation after fracture(A11.3)increase by 20.58%and 19.40%,respectively,compared with that without nanoparticles and *** increase heterogeneous nucleation rate by 50%compared with that without *** depth of dezincification layer decreases by 78.71%compared with that without nanoparticles and stirring,as protective layer(Cu-Al_(2)O_(3)-Zn)is completely formed around the grain boundaries.

关键词： Microstructural refinement Rotating electromagnetic field Mechanical performance Al_(2)O_(3)nanoparticles

压力手套结合持续被动运动训练系统对手背部烧伤康复情况的影响研究

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中国疗养医学 2024年第4期33卷 21-24页

作者：焦爱丽王伟阁崔承铭商丘市第一人民医院烧伤整形外科河南商丘476000

目的观察压力手套结合持续被动运动(CPM)训练系统对手背部烧伤患者康复情况的影响。方法本研究为前瞻性研究,选择商丘市第一人民医院2020年2月至2022年2月收治的125例手背部烧伤患者为研究对象,根据患者是否愿意接受康复治疗,将其分... 详细信息

目的观察压力手套结合持续被动运动(CPM)训练系统对手背部烧伤患者康复情况的影响。方法本研究为前瞻性研究,选择商丘市第一人民医院2020年2月至2022年2月收治的125例手背部烧伤患者为研究对象,根据患者是否愿意接受康复治疗,将其分为联合组(70例)和对照组(55例),两组均实施手部功能锻炼,对照组佩戴压力手套配合干预,联合组应用CPM训练系统+压力手套配合干预,所有患者开展为期1年随访,比较两组患者的手关节活动度、上肢功能、手瘢痕恢复情况、上皮覆盖率。结果在不同干预方案下,联合组的掌指关节(MCP)、近端指间关节(PIP)、远端指间关节(DIP)活动度分别为(60.45±10.27)°、(70.36±10.27)°、(42.33±10.41)°,均高于对照组(55.32±10.47)°、(65.25±10.18)°、(35.62±8.13)°;联合组随访第3个月、12个月时的Carroll上肢功能评定法(UEFT)评分分别为(65.23±10.43)分、(78.44±10.36)分,均高于对照组(60.19±10.27)分、(72.33±10.25)分;随访第3个月、12个月时的上肢动作研究量表(ARAT)评分分别为(35.22±5.46)分、(44.76±5.38)分,均高于对照组(32.49±5.13)分、(41.24±5.49)分;联合组随访第3个月、12个月时的温哥华瘢痕量表(VSS)评分分别为(7.66±1.23)分、(4.14±1.25)分,均低于对照组[(8.82±1.95)分、(5.72±1.88)分];随访第3个月、12个月时的上皮覆盖率分别为(80.33±10.45)%、(91.25±10.27)%,均高于对照组(75.62±10.11)%、(85.94±10.33)%,差异均具有统计学意义(P<0.05)。结论压力手套结合CPM训练系统可进一步改善手背部烧伤患者的手关节、上肢功能恢复,对促进其手部瘢痕恢复、创面愈合均有积极意义。

关键词：手背部烧伤压力手套持续被动运动手功能手部瘢痕

外源氨基酸对层出镰刀菌菌丝生长和伏马毒素合成的影响

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中国稻米 2024年第1期30卷 47-52页

作者：梁文豪胡时开圣忠华魏祥进焦桂爱邵高能谢黎虹王玲唐绍清胡培松中国水稻研究所/水稻生物育种全国重点实验室杭州310006

由层出镰刀菌引起的水稻穗腐病,不仅造成水稻产量损失,而且因产生真菌毒素而导致稻米品质下降。本研究通过在生长培养基中添加外源氨基酸,评价其对层出镰刀菌菌丝生长和伏马毒素合成的影响。结果表明,不同氨基酸和不同添加量对菌丝生长... 详细信息

由层出镰刀菌引起的水稻穗腐病,不仅造成水稻产量损失,而且因产生真菌毒素而导致稻米品质下降。本研究通过在生长培养基中添加外源氨基酸,评价其对层出镰刀菌菌丝生长和伏马毒素合成的影响。结果表明,不同氨基酸和不同添加量对菌丝生长均有影响。与未添加氨基酸的对照相比,在MM培养基上添加L-精氨酸、L-谷氨酸、L-脯氨酸和L-瓜氨酸,在PDA培养基上添加L-谷氨酸,均抑制菌丝生长。添加氨基酸显著提高了伏马毒素含量,且随着氨基酸浓度升高,在PDA中产毒量减少,在MM中则呈增加趋势。外源氨基酸明显改变了伏马毒素生物合成基因在转录水平上的表达,但基因表达模式与毒素含量并不一致。综合分析表明,外源氨基酸会影响层出镰刀菌菌丝生长和伏马毒素含量,且不同氨基酸组分与菌丝生长和伏马毒素合成的关联性不同。

关键词：水稻穗腐病层出镰刀菌外源氨基酸菌丝生长伏马毒素

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Protective Effect of Fresh/Dry Dandelion Extracts on APAP-Overdose-Induced Acute Liver Injury

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Chinese Journal of Integrative Medicine 2022年第8期28卷 683-692页

作者： ZHENG Yao LEI Lei LIANG Shuai ai jiao DENG Xin LI Yan-qiu ZHANG Tian-pei PU Shi-biao REN Yong-shen School of Pharmaceutical Science South-Central University for NationalitiesWuhan430074China College of Chinese Materia Medica Yunnan University of Chinese MedicineKunming650500China

Objecitvie:To compare the liver protective activity of fresh/dried dandelion extracts against acetaminophen(APAP)-induced ***:Totally 90 Kunming mice were randomly divided into10 groups according to body weight(9 mice for each group).The mice in the normal control and model(vehicle control)groups were administered sodium carboxymethyl cellulose(CMC-Na,0.5%)*** groups were pretreated with high and low-dose dry dandelion extract(1,000 or 500 g fresh herb dried and then decocted into 120 mL solution,DDE-H and DDE-L);low-,medium-and high-dose dandelion juice(250,500,1,000 g/120 mL,DJ-L,DJ-M,and DJ-H);fresh dandelions evaporation juice water(120 mL,DEJW);dry dandelion extract dissolved by pure water(1 kg/120 mL,DDED-PW);dry dandelion extract dissolved by DEJW(120 g/120 mL,DDED-DEJW)by oral gavage for 7 days at the dosage of 0.5 mL solution/10 g body weight;after that,except normal control group,all other groups were intraperitonealy injected with 350 mg/kg APAP to induce liver *** hours after APAP administration,serum and liver tissue were collected and serum alanine aminotransferase(AST),aspartate transaminase(ALT),alkaline phosphatase(AKP),malondialdehyde(MDA),glutathione(GSH),superoxide dismutase(SOD)activities were quantified by biochemical kits;tumor necrosis factor(TNF-α),interleukin(IL)-2,and IL-1β contents in liver tissue were determined by enzyme linked immunosorbent assay *** changes in liver tissues were observed by hematoxylin and eosin staining;TUNEL Assay and Hoechst 33258 staining were applied for cell apoptosis *** expressions of heme oxygenase-1(HO-1),nuclear factor erythroid-2-related factor 2(Nrf-2),caspase-9,B-cell leukemia/lymphoma 2(Bcl-2),Bax and p-JNK were determined by Western blot ***:Pretreatment with fresh dandelion juice(FDJ,including DJ-L,DJ-M,DJ-H,DEJW and DDED-DEJW)significantly decreased the levels of serum ALT,AST,AKP,TNF-α and IL-1β compared with veh

关键词： fresh dandelion juice acetaminophen-induced liver injury oxidative stress anti-inflammation anti-apoptosis

Almost Sure Convergence and Complete Convergence for the Weighted Sums of Martingale Differences

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Wuhan University Journal of Natural Sciences 1999年第3期4卷 278-284页

作者： Deng, ai-jiao Liu, Jing-jun

Let {(D n, FFFn),n/->1} be a sequence of martingale differences and {a ni, 1≤i≤n,n≥1} be an array of real constants. Almost sure convergence for the row sums ?i = 1n ani D1\sum\limits_{i = 1}^n {a_{ni} D_1 } are discussed. We also discuss complete convergence for the moving average processes underB-valued martingale differences assumption.

关键词： complete convergence almost sure convergence weighted sums, martingale differences moving average processes

Variation Characteristics of Root Traits of Different Alfalfa Cultivars under Saline-Alkaline Stress and their Relationship with Soil Environmental Factors

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Phyton-International Journal of Experimental Botany 2024年第1期93卷 29-43页

作者： Tian-jiao Wei Guang Li Yan-Ru Cui jiao Xie Xing-ai Gao Xing Teng Xin-Ying Zhao Fa-Chun Guan Zheng-Wei Liang Northeast Agricultural Research Center of China Jilin Academy of Agricultural SciencesChangchun130033China Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun130102China

Soil salinization is the main factor that threatens the growth and development of plants and limits the increase of *** is of great significance to study the key soil environmental factors affecting plant root traits to reveal the adaptation strategies of plants to saline-alkaline-stressed soil *** this study,the root biomass,root morphological parameters and root mineral nutrient content of two alfalfa cultivars with different sensitivities to alkaline stress were analyzed with black soil as the control group and the mixed saline-alkaline soil with a ratio of 7:3 between black soil and saline-alkaline soil as the saline-alkaline treatment *** the same time,the correlation analysis of soil salinity indexes,soil nutrient indexes and the activities of key enzymes involved in soil carbon,nitrogen and phosphorus cycles was carried *** results showed that compared with the control group,the pH,EC,and urease(URE)of the soil surrounding the roots of two alfalfa cultivars were significantly increased,while soil total nitrogen(TN),total phosphorus(TP),organic carbon(SOC),andα-glucosidase activity(AGC)were significantly decreased under saline-alkaline *** was no significant difference in root biomass and root morphological parameters of saline-alkaline tolerant cultivar GN under saline-alkaline *** number of root tips(RT),root surface area(RS)and root volume(RV)of AG were reduced by 61.16%,44.54%,and 45.31%,respectively,compared with control *** ratios of K^(+)/Na^(+),Ca^(2+)/Na^(+)and Mg^(2+)/Na^(+)of GN were significantly higher than those of AG(p<0.05).The root fresh weight(RFW)and dry weight(RDW),root length(RL),RV and RT of alfalfa were positively regulated by soil SOC and TN,but negatively regulated by soil pH,EC,and URE(p<0.01).Root Ca^(2+)/Na+ratio was significantly positively correlated with soil TN,TP and SOC(p<0.01).The absorption of Mg and Ca ions in roots is significantly negatively regulated by soilβ-glucosidase ac

关键词： Saline-alkaline stress alfalfa root traits soil environmental factors correlation analysis

Paeoniflorin Attenuates Myocardial Fibrosis in Isoprenaline-induced Chronic Heart F ailure Rats via Inhibiting P38 MA PK Pathway

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Current Medical Science 2020年第2期40卷 307-312页

作者： Mao LIU Jie FENG Qian DU jiao ai Zhan LV Department of Cardiology Cardiovascular Research CenterAfiliated Hospital of North Sichuan Medical CollegeNanchong 637000China Department of Clinical Medicine North Sichuan Medical CollegeNanchong 637000China

Paconiflorin(Pae)is a monoterpenoid glycoside compound and has many biological activitics,such as immunosuppression,anti-inflammation and anti-cell ***,the effects and mechanisms of Pae on chronic heart failure(CHF)remain *** study was conducted to assess the effects and mechanisms of Pae on myocardial fibrosis in isoprenaline(Iso)-induced CHF ***(20 mgkg)was intragastrically administrated to CHF rats for 6 *** structure and function were *** protein and mRNA levels of transforming growth factorβ1(TGF-β1)and p38 were detected.C ompared to Iso group,Pae could alleviate myocardial fbrosis and improve cardiac function in CHF *** levels of collagen volume fraction(13.75%+3.77%vs.30.97%+4.22%,P<0.001)and perivascular collagen volume area(14.32%+2.50%v8.28.31%+3.16%,P<0.001)were significantly reduced in Pae group as compared with those in Iso *** expression of TGF-BI protein(0.30+0.07 vs.0.66+0.07,P<0.05)and mRNA(3.51+0.44 vs.7.58+0.58,P<0.05)decreased significantly in Pac group as compared with that in Iso *** expression of p38 protein(0.36+0.12 vs.0.81+0.38,P<0.05)and mRNA(3.84+0.05 vs.4.40+0.17,P<0.05)also decreased markedly in Pae group as compared with that in Iso *** could attenuate myocardial fibrosis and improve cardiac function in CHF rats by down-regulating the p38 MAPK signaling pathway.

关键词： chronic heart failure paconiflorin myocardial fibrosis p38 transforming growth factorβ1

A pseudoclassical theory for the wavepacket dynamics of the kicked rotor model

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 34-43页

作者： Zhixing Zou jiao Wang Department of Physics and Key Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province) Xiamen UniversityXiamen 361005China Lanzhou Center for Theoretical Physics Lanzhou UniversityLanzhou 730000China

In this study, we propose a generalized pseudoclassical theory for the kicked rotor model in an attempt to discern the footprints of the classical dynamics in the deep quantum regime. Compared with the previous pseudoclassical theory that applies only in the neighborhoods of the lowest two quantum resonances, the proposed theory is applicable in the neighborhoods of all quantum resonances in principle by considering the quantum effect of the free rotation at a quantum resonance. In particular, it is confirmed by simulations that the quantum wavepacket dynamics can be successfully forecasted based on the generalized pseudoclassical dynamics, offering an intriguing example where it is feasible to bridge the dynamics in the deep quantum regime to the classical dynamics. The application of the generalized pseudoclassical theory to the PT-symmetric kicked rotor is also discussed.

关键词： quantum-classical correspondence kicked rotor model pseudoclassical theory wavepacket dynamics