期刊文献+
共找到1,834篇文章
< 1 2 92 >
每页显示 20 50 100
通过成结模拟器研究n^(+)-n^(-)-p碲镉汞高温探测器
1
作者 林加木 周松敏 +3 位作者 王溪 甘志凯 林春 丁瑞军 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2024年第1期23-28,共6页
第三代红外探测器发展的一个重要方向是高工作温度探测器。对于碲镉汞n-on-p探测器而言,n^(+)-n^(-)-p结构以及良好的钝化工艺能够有效的抑制暗电流的产生,从而在高工作温度条件下获得较好的探测器性能。基于自行开发的成结模拟器,对n^(... 第三代红外探测器发展的一个重要方向是高工作温度探测器。对于碲镉汞n-on-p探测器而言,n^(+)-n^(-)-p结构以及良好的钝化工艺能够有效的抑制暗电流的产生,从而在高工作温度条件下获得较好的探测器性能。基于自行开发的成结模拟器,对n^(+)-n^(-)-p结构地高温器件进行了工艺仿真和器件仿真,获得成结过程的制备参数,并结合抑制表面漏电的组分梯度钝化工艺,将高工作温度下的暗电流抑制至理论极限,研制出可以在更高温度工作下的碲镉汞n-on-p红外焦平面探测器。经测试,中波n-on-p红外焦平面器件在不同工作温度下性能优异,在80 K工作温度下噪声等效温差(NETD)达到了6.1 mK,有效像元率为99.96%;而在150 K工作温度下噪声等效温差(NETD)为11.0 mK,有效像元率为99.50%,达到了同类器件的理论极限。 展开更多
关键词 碲镉汞 n^(+)-n^(-)-p 高工作温度 红外焦平面
下载PDF
桑黄素通过抑制ERK1/2-p38信号通路介导对老年大鼠骨骼保护作用
2
作者 王林 周茂生 《中山大学学报(医学科学版)》 CAS CSCD 北大核心 2024年第2期261-267,共7页
【目的】探讨桑黄素(SSS)治疗对老年大鼠骨代谢及骨量影响,并阐明其可能的作用机制。【方法】10只3月龄年轻雌性Sprague-Dawley(SD)大鼠和20只24月龄老年雌性SD大鼠随机分为3组,对照组(CON,10只年轻大鼠)、模型组(MOD,10只老年大鼠)和... 【目的】探讨桑黄素(SSS)治疗对老年大鼠骨代谢及骨量影响,并阐明其可能的作用机制。【方法】10只3月龄年轻雌性Sprague-Dawley(SD)大鼠和20只24月龄老年雌性SD大鼠随机分为3组,对照组(CON,10只年轻大鼠)、模型组(MOD,10只老年大鼠)和桑黄素组(SSS,10只老年大鼠)。在实验过程中,SSS组每日接受腹腔注射桑黄素(10 mg/kg)治疗。治疗为期12周,待治疗结束后使用Micro-CT、HE染色切片、血清学检测以及蛋白质印迹观察治疗效果以及可能的机制。【结果】治疗12周后,与MOD组相比,SSS组的大鼠骨小梁数量和密度得到明显的改善。SSS组左侧股骨BMD、Conn.D、Tb.N、Tb.Th和Tb.Sp较MOD组明显改善(P<0.05)。治疗12周时,SSS组CTX-1、骨钙素、TRACP-5b和PINP水平较MOD显著降低(P<0.05)。和MOD组比较,SSS组的大鼠ERK1/2-p38信号通路显著抑制,ERK1/2和p38水平显著降低,比较有统计学差异(P<0.05)。【结论】桑黄素通过抑制ERK1/2-p38信号通路和降低骨转换来介导对老年大鼠骨骼保护作用。 展开更多
关键词 桑黄素 骨质疏松症 ERK1/2-p38 信号通路 骨密度 大鼠
下载PDF
基于JNK-p62/SQSTM1信号通路探讨糖肾煎对2型糖尿病肾病大鼠足细胞的保护作用
3
作者 晏玲 胡爱民 +1 位作者 张利芳 牛晓静 《中国老年学杂志》 CAS 北大核心 2024年第5期1178-1182,共5页
目的 基于c-Jun氨基末端激酶(JNK)-p62/螯合体(SQSTM1)信号通路探讨糖肾煎对2型糖尿病肾病(DN)大鼠足细胞的保护作用。方法 SD大鼠随机分成正常组、DN组、糖肾煎低、中、高[生药5、10、20 g/(kg·d)]剂量组(糖肾煎-L、M、H组)、二... 目的 基于c-Jun氨基末端激酶(JNK)-p62/螯合体(SQSTM1)信号通路探讨糖肾煎对2型糖尿病肾病(DN)大鼠足细胞的保护作用。方法 SD大鼠随机分成正常组、DN组、糖肾煎低、中、高[生药5、10、20 g/(kg·d)]剂量组(糖肾煎-L、M、H组)、二甲双胍组[100 mg/(kg·d)]。除正常组外,其余各组通过喂养高脂高糖饲料和腹腔注射链脲佐菌素(STZ)进行DN模型构建。药物干预结束后,检测大鼠血生化指标空腹血糖(FBG)、负荷后2 h血糖(P2 h BG)、血肌酐(SCr)、血尿素氮(BUN)水平;苏木素-伊红(HE)、六胺银(PASM)染色观察肾组织病理学变化;透射电镜(TEM)观察肾小球基底膜损伤和足细胞变化情况;Western印迹检测肾组织中微管相关蛋白1A/1B-轻链(LC)3、p-JNK、JNK、p62/SQSTM1、肾病蛋白(Nephrin)蛋白表达。结果 与正常组比较,DN组FBG、P2 h BG、SCr、BUN水平及p62/SQSTM1蛋白表达明显升高,LC3-Ⅱ、Nephrin蛋白表达和p-JNK/JNK明显降低(P<0.05);光镜下观察到肾小球缩小、管丛系膜明显扩张,并有基底膜增生增厚等现象;TEM下观察到肾小球基底膜增厚、足细胞排列紊乱、形态改变、足突融合等现象。与DN组比较,糖肾煎-L、M、H组和二甲双胍组FBG、P2 h BG、SCr、BUN水平及p62/SQSTM1蛋白表达明显降低,LC3-Ⅱ、Nephrin蛋白表达和p-JNK/JNK明显升高(P<0.05);并且肾小球基底膜增厚、足细胞足突融合等情况均获得一定程度减轻。结论 糖肾煎对2型DN大鼠足细胞具有一定保护作用,可能是通过调控JNK-p62/SQSTM1信号通路,提高足细胞自噬,从而起到肾脏保护功效。 展开更多
关键词 糖肾煎 2型糖尿病肾病 足细胞 c-Jun氨基末端激酶(JNK)-p62/螯合体(SQSTM1)信号通路
下载PDF
USP7-MDM2-p53信号轴对子宫内膜癌细胞增殖、凋亡和细胞周期的影响
4
作者 魏伟 赵慧娟 刘湘翠 《现代肿瘤医学》 CAS 2024年第2期214-220,共7页
目的:探讨泛素特异性蛋白酶7(USP7)调节Mdm2 p53结合蛋白同源物(MDM2)-p53轴对子宫内膜癌细胞增殖、凋亡和细胞周期的影响。方法:Western blot检测人子宫内膜癌组织、癌旁组织、人子宫内膜上皮细胞hEEC及人子宫内膜癌细胞系Ishikawa、HE... 目的:探讨泛素特异性蛋白酶7(USP7)调节Mdm2 p53结合蛋白同源物(MDM2)-p53轴对子宫内膜癌细胞增殖、凋亡和细胞周期的影响。方法:Western blot检测人子宫内膜癌组织、癌旁组织、人子宫内膜上皮细胞hEEC及人子宫内膜癌细胞系Ishikawa、HEC-1-A、KLE中USP7蛋白表达。将Ishikawa细胞分为NC组、P22077(USP7抑制剂)组、pcDNA组、pcDNA-MDM2组、P22077+pcDNA组、P22077+pcDNA-MDM2组,CCK-8法和克隆形成实验检测Ishikawa细胞增殖;流式细胞术检测Ishikawa细胞凋亡与细胞周期变化;Western blot检测Ishikawa细胞中USP7、细胞周期蛋白D1(CyclinD1)、周期素依赖性激酶2(CDK2)、Bcl-2相关X蛋白(Bax)、MDM2、p53蛋白表达。以RG7388(MDM2抑制剂)或PFT-α(p53抑制剂)与20μmol/L P22077共处理Ishikawa细胞48 h以验证USP7-MDM2-p53信号轴上下游关系。结果:USP7蛋白在子宫内膜癌组织和细胞中高表达,且Ishikawa细胞中USP7蛋白表达量最高,因此,选择Ishikawa细胞为研究对象。与NC组比较,P22077组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达降低,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达升高(P<0.05);与NC组、pcDNA组比较,pcDNA-MDM2组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达升高,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达降低(P<0.05);与P22077组、P22077+pcDNA组比较,P22077+pcDNA-MDM2组Ishikawa细胞OD 450值、克隆形成率、S期和G 2/M期细胞数、USP7、CyclinD1、CDK2、MDM2蛋白表达升高,细胞凋亡率、G_(0)/G_(1)期细胞数、p53、Bax蛋白表达降低(P<0.05)。p53为USP7-MDM2通路下游分子。结论:抑制USP7表达可能通过下调MDM2来激活p53进而抑制Ishikawa细胞增殖、促进细胞凋亡及周期停滞。 展开更多
关键词 泛素特异性蛋白酶7 Mdm2 p53结合蛋白同源物(MDM2)-p53轴 子宫内膜癌 增殖 凋亡 细胞周期
下载PDF
猪肺炎支原体P46-P65重组蛋白的表达及间接ELISA抗体检测方法的建立 被引量:1
5
作者 杨振宇 李璇 +7 位作者 刘一宁 谢邵波 郑金 刘春燕 林美婷 刘腾 唐红剑 余兴龙 《中国预防兽医学报》 CAS CSCD 北大核心 2024年第7期709-715,共7页
为建立猪肺炎支原体(Mhp)血清学调查及免疫评估方法,本研究利用DNAStar生物学软件对Mhp的P46和P65进行抗原表位分析,利用重叠延伸PCR(SOE-PCR)获得P46-P65融合基因,构建重组表达质粒pETP46-P65,将其转化大肠杆菌BL21(DE3)感受态细胞,经... 为建立猪肺炎支原体(Mhp)血清学调查及免疫评估方法,本研究利用DNAStar生物学软件对Mhp的P46和P65进行抗原表位分析,利用重叠延伸PCR(SOE-PCR)获得P46-P65融合基因,构建重组表达质粒pETP46-P65,将其转化大肠杆菌BL21(DE3)感受态细胞,经诱导后获得了可溶性表达的重组P46(aa33~aa419)-P65(aa307~aa627)蛋白(rP46-P65)。以纯化的r P46-P65为包被抗原,经优化各反应条件后建立了检测Mhp抗体的间接ELISA方法。特异性试验结果显示所建立的方法与CSFV、FMDV、PEDV、PCV2、PRV、PRRSV和APP等阳性血清均无交叉反应。该方法可检测到最高稀释至6 400倍的Mhp阳性血清,批内和批间变异系数均小于5%。利用IDEXX试剂盒和本研究建立的方法同时检测298份临床血清样品,前者的检测阳性率为62.4%(186/298),后者的检测阳性率为73.8%(220/298),两者检测结果的总符合率为88.6%。IDEXX检测为阳性的血清,采用本研究建立的ELISA方法检测也均为阳性;而部分Mhp阳性猪经IDEXX试剂盒检测为阴性的血清,该ELISA方法检测结果却为阳性,其中79.4%(27/34)检测结果有差异的血清经Mhp颜色变化试验证明均为阳性,表明本研究建立的ELISA方法的敏感性明显高于IDEXX方法。本研究建立的检测猪Mhp抗体的间接ELISA方法与目前广泛使用的方法相比优势明显,为临床血清流行病学调查及血清抗体水平评估提供了可行方法。 展开更多
关键词 猪肺炎支原体 重组 融合蛋白P46-p65 间接ELISA
下载PDF
Hes1调控AKT-MDM2-p53-PTEN通路的一种物理机制 被引量:1
6
作者 苏瑞 李循 +3 位作者 王书恒 刘彼得 赵新军 李九智 《原子与分子物理学报》 北大核心 2024年第5期125-134,共10页
基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失... 基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKT-MDM2-p53-PTEN通路信号,将会有效地控制细胞结果.Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活机制. 展开更多
关键词 Hes1蛋白 调控 AKT-MDM2-p53-pTEN通路
下载PDF
菹草(Potamogeton crispus)叶面CaCO_(3)-P沉淀物产生的关键影响因子分析
7
作者 陶轶凡 黄蔚 +2 位作者 余成 陈开宁 李子威 《湖泊科学》 EI CAS CSCD 北大核心 2024年第4期1060-1068,共9页
沉水植物光合作用形成的微环境有利于水体中钙和磷形成CaCO_(3)-P共沉淀,但在不同水环境因子下水体中钙和磷形成CaCO_(3)-P共沉淀的能力不同。本研究以菹草(Potamogeton crispus)为研究对象,研究不同钙浓度(0、20、35、50、65 mg/L)、碱... 沉水植物光合作用形成的微环境有利于水体中钙和磷形成CaCO_(3)-P共沉淀,但在不同水环境因子下水体中钙和磷形成CaCO_(3)-P共沉淀的能力不同。本研究以菹草(Potamogeton crispus)为研究对象,研究不同钙浓度(0、20、35、50、65 mg/L)、碱度(0、100、200、300、400 mg/L CaCO_(3))、磷浓度(0、0.1、0.2、0.3、0.4 mg/L)和温度(11、14、17、20℃)对菹草削减水体磷的能力及对CaCO_(3)-P共沉淀产生的差异,并通过分析无植物对照组培养液的饱和指数变化趋势,揭示植物介导下CaCO_(3)-P的发生规律,为湖泊生态修复中沉水植物的选择提供理论依据。结果表明:①在菹草培养组中,总磷(TP)和溶解性磷酸盐(SRP)浓度显著下降,并且不同处理组之间存在显著差异。随着钙浓度的增加,各处理组的TP和SRP浓度均呈减小趋势,而添加钙浓度导致减幅进一步提高。相比之下,在无菹草对照组中,TP和SRP浓度没有显著变化。这表明菹草的引入促进了水中磷的去除效率。②各处理组CaCO_(3)-P共沉淀量随碱度的增加而增加,碱度为400 mg/L CaCO_(3)时,产生最大CaCO_(3)-P共沉淀量,说明菹草在碱性水环境中更有利于产生CaCO_(3)-P共沉淀。共沉淀在中等磷水平(0.2 mg/L)产生量最高,每株菹草每天平均产生23.12 mg共沉淀量。实验验证了自然水体磷浓度对菹草叶面CaCO_(3)-P共沉淀量的产生差异较小,共沉淀在中等温度水平(17℃)含量最高,每株菹草每天平均产生16.61 mg共沉淀量,说明菹草在适宜温度下产生共沉淀的差异不大。以上结果表明,碱度相较于磷浓度及温度对菹草的CaCO_(3)-P共沉淀量影响更大。③在水环境因子相同的情况下,无菹草对照组碳酸钙饱和指数(方解石和霰石饱和指数)均大于0,说明有结晶趋势,但在实验期间并未产生沉淀,而添加菹草的处理组产生了不等量的CaCO_(3)-P共沉淀,表明沉水植物也可通过共沉淀的方式削减水体磷负荷,为湖泊富营养化的治理提供理论支撑。 展开更多
关键词 沉水植物 CaCO_(3)-p共沉淀 菹草
下载PDF
Ensuring Secure Platooning of Constrained Intelligent and Connected Vehicles Against Byzantine Attacks:A Distributed MPC Framework 被引量:1
8
作者 Henglai Wei Hui Zhang +1 位作者 Kamal AI-Haddad Yang Shi 《Engineering》 SCIE EI CAS CSCD 2024年第2期35-46,共12页
This study investigates resilient platoon control for constrained intelligent and connected vehicles(ICVs)against F-local Byzantine attacks.We introduce a resilient distributed model-predictive platooning control fram... This study investigates resilient platoon control for constrained intelligent and connected vehicles(ICVs)against F-local Byzantine attacks.We introduce a resilient distributed model-predictive platooning control framework for such ICVs.This framework seamlessly integrates the predesigned optimal control with distributed model predictive control(DMPC)optimization and introduces a unique distributed attack detector to ensure the reliability of the transmitted information among vehicles.Notably,our strategy uses previously broadcasted information and a specialized convex set,termed the“resilience set”,to identify unreliable data.This approach significantly eases graph robustness prerequisites,requiring only an(F+1)-robust graph,in contrast to the established mean sequence reduced algorithms,which require a minimum(2F+1)-robust graph.Additionally,we introduce a verification algorithm to restore trust in vehicles under minor attacks,further reducing communication network robustness.Our analysis demonstrates the recursive feasibility of the DMPC optimization.Furthermore,the proposed method achieves exceptional control performance by minimizing the discrepancies between the DMPC control inputs and predesigned platoon control inputs,while ensuring constraint compliance and cybersecurity.Simulation results verify the effectiveness of our theoretical findings. 展开更多
关键词 Model predictive control Resilient control Platoon control Intelligent and connected vehicle Byzantine attacks
下载PDF
基于CyclinD1-CDK4/6-P16通路探究欣胃颗粒对胃癌前病变大鼠细胞增殖的影响
9
作者 方姣 王子博 +1 位作者 王子鉴 张杨 《现代消化及介入诊疗》 2024年第5期543-546,551,共5页
目的基于CyclinD1-CDK4/6-P16通路探究欣胃颗粒对胃癌前病变大鼠细胞增殖的影响。方法将180只Wistar大鼠随机分为6组,每组30只:空白对照(空白)组、模型组、胃复春对照组、欣胃颗粒(低、中、高剂量)组,采用以MNNG法为主的复合造模方法制... 目的基于CyclinD1-CDK4/6-P16通路探究欣胃颗粒对胃癌前病变大鼠细胞增殖的影响。方法将180只Wistar大鼠随机分为6组,每组30只:空白对照(空白)组、模型组、胃复春对照组、欣胃颗粒(低、中、高剂量)组,采用以MNNG法为主的复合造模方法制作PLGC大鼠模型。欣胃颗粒低、中、高剂量组分别以0.72 g·kg^(-1)、1.44 g·kg^(-1)、2.88 g·kg^(-1);胃复春组予0.52 g·kg^(-1),日一次灌胃给药,空白组与模型组给予同体量的生理盐水灌胃。实验周期为16周,结束后观察大鼠的一般情况,并用RT-PCR、Westernblotting技术检测胃黏膜中CyclinD1、CDK4/6、P16的mRNA及蛋白表达情况。结果欣胃颗粒各组和胃复春组大鼠的活动与饮食等情况同模型组相比都有不同程度的好转;与空白对照组相比,模型组CyclinD1、CDK4、CDK6的mRNA及蛋白表达水平显著升高;P16的mRNA及蛋白表达水平显著降低(P<0.05);欣胃颗粒(低、中、高剂量)组、胃复春组与模型组比较CyclinD1、CDK4、CDK6mRNA及蛋白表达水平均有降低;P16的mRNA及蛋白表达水平显著升高(P<0.05),其中欣胃颗粒中剂量组的疗效最为显著。结论欣胃颗粒通过CyclinD1-CDK4/6-P16通路参与细胞周期的调控,进而抑制PLGC细胞的增殖。 展开更多
关键词 CyclinD1-CDK4/6-p16通路 欣胃颗粒 胃癌前病变 中医药
下载PDF
基于培土生金法探讨六君子汤对慢性阻塞性肺疾病患者血清p-P38MAPK的影响 被引量:1
10
作者 王珂 王玉喜 +1 位作者 赖静 王昌明 《广州中医药大学学报》 CAS 2024年第7期1687-1693,共7页
【目的】分析六君子汤对慢性阻塞性肺疾病(COPD)患者血清磷酸化-P38丝裂原活化蛋白激酶(p-P38MAPK)水平的影响。【方法】选取杭州市临安区中医院2020年9月至2022年9月收治的112例COPD肺脾气虚型患者为研究对象,根据治疗方法的不同将其... 【目的】分析六君子汤对慢性阻塞性肺疾病(COPD)患者血清磷酸化-P38丝裂原活化蛋白激酶(p-P38MAPK)水平的影响。【方法】选取杭州市临安区中医院2020年9月至2022年9月收治的112例COPD肺脾气虚型患者为研究对象,根据治疗方法的不同将其分为观察组和对照组,每组各56例。对照组给予常规西医治疗,观察组在对照组的基础上给予六君子汤治疗,每疗程为7 d,共治疗3个月。观察2组患者治疗前后肺功能指标、6 min步行距离(6MWD)、慢阻肺临床问卷(CCQ)评分、血清炎症因子和p-P38MAPK水平的变化情况,比较2组患者的临床疗效、不良反应发生率和1年内急性发作次数。【结果】(1)治疗3个月后,观察组的总有效率为94.64%(53/56),对照组为73.21%(41/56),组间比较(χ^(2)检验),观察组的疗效明显优于对照组(P<0.01)。(2)治疗后,2组患者的用力肺活量(FVC)、第1秒用力呼气容积(FEV_(1))、FEV_(1)/FVC、6MWD均较治疗前升高(P<0.05),CCQ评分均较治疗前降低(P<0.05),且观察组对FVC、FEV_(1)、FEV_(1)/FVC、6MWD的升高幅度及对CCQ评分的降低幅度均明显优于对照组(P<0.01)。(3)治疗后,2组患者血清白细胞介素4(IL-4)、白细胞介素6(IL-6)、白细胞介素8(IL-8)及p-P38MAPK水平均较治疗前降低(P<0.05),且观察组的降低幅度均明显优于对照组(P<0.01)。(4)观察组的不良反应发生率为3.57%(2/56),对照组为7.14%(4/56),组间比较,差异无统计学意义(P>0.05)。(5)观察组1年内急性发作次数为(0.68±0.12)次,明显低于对照组的(1.46±0.37)次,差异有统计学意义(P<0.01)。【结论】六君子汤治疗COPD肺脾气虚型患者疗效确切,可有效抑制p-P38MAPK信号通路活化,缓解咳痰、呼吸困难等症状,改善肺功能,减轻炎症反应,降低急性发作次数,且具有较高的安全性。 展开更多
关键词 六君子汤 慢性阻塞性肺疾病 肺功能 炎症反应 磷酸化-p38丝裂原活化蛋白激酶(p-p38MAPK)
下载PDF
Approximately Bi-Similar Symbolic Model for Discretetime Interconnected Switched System
11
作者 Yang Song Yongzhuang Liu Wanqing Zhao 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2024年第10期2185-2187,共3页
Dear Editor,This letter concerns the development of approximately bi-similar symbolic models for a discrete-time interconnected switched system(DT-ISS).The DT-ISS under consideration is formed by connecting multiple s... Dear Editor,This letter concerns the development of approximately bi-similar symbolic models for a discrete-time interconnected switched system(DT-ISS).The DT-ISS under consideration is formed by connecting multiple switched systems known as component switched systems(CSSs).Although the problem of constructing approximately bi-similar symbolic models for DT-ISS has been addressed in some literature,the previous works have relied on the assumption that all the subsystems of CSSs are incrementally input-state stable. 展开更多
关键词 APPROXIMATE SYMBOLIC connected
下载PDF
FADSF:A Data Sharing Model for Intelligent Connected Vehicles Based on Blockchain Technology
12
作者 Yan Sun Caiyun Liu +1 位作者 Jun Li Yitong Liu 《Computers, Materials & Continua》 SCIE EI 2024年第8期2351-2362,共12页
With the development of technology,the connected vehicle has been upgraded from a traditional transport vehicle to an information terminal and energy storage terminal.The data of ICV(intelligent connected vehicles)is ... With the development of technology,the connected vehicle has been upgraded from a traditional transport vehicle to an information terminal and energy storage terminal.The data of ICV(intelligent connected vehicles)is the key to organically maximizing their efficiency.However,in the context of increasingly strict global data security supervision and compliance,numerous problems,including complex types of connected vehicle data,poor data collaboration between the IT(information technology)domain and OT(operation technology)domain,different data format standards,lack of shared trust sources,difficulty in ensuring the quality of shared data,lack of data control rights,as well as difficulty in defining data ownership,make vehicle data sharing face a lot of problems,and data islands are widespread.This study proposes FADSF(Fuzzy Anonymous Data Share Frame),an automobile data sharing scheme based on blockchain.The data holder publishes the shared data information and forms the corresponding label storage on the blockchain.The data demander browses the data directory information to select and purchase data assets and verify them.The data demander selects and purchases data assets and verifies them by browsing the data directory information.Meanwhile,this paper designs a data structure Data Discrimination Bloom Filter(DDBF),making complaints about illegal data.When the number of data complaints reaches the threshold,the audit traceability contract is triggered to punish the illegal data publisher,aiming to improve the data quality and maintain a good data sharing ecology.In this paper,based on Ethereum,the above scheme is tested to demonstrate its feasibility,efficiency and security. 展开更多
关键词 Blockchain connected vehicles data sharing smart contracts credible traceability
下载PDF
Heterogeneous Task Allocation Model and Algorithm for Intelligent Connected Vehicles
13
作者 Neng Wan Guangping Zeng Xianwei Zhou 《Computers, Materials & Continua》 SCIE EI 2024年第9期4281-4302,共22页
With the development of vehicles towards intelligence and connectivity,vehicular data is diversifying and growing dramatically.A task allocation model and algorithm for heterogeneous Intelligent Connected Vehicle(ICV)... With the development of vehicles towards intelligence and connectivity,vehicular data is diversifying and growing dramatically.A task allocation model and algorithm for heterogeneous Intelligent Connected Vehicle(ICV)applications are proposed for the dispersed computing network composed of heterogeneous task vehicles and Network Computing Points(NCPs).Considering the amount of task data and the idle resources of NCPs,a computing resource scheduling model for NCPs is established.Taking the heterogeneous task execution delay threshold as a constraint,the optimization problem is described as the problem of maximizing the utilization of computing resources by NCPs.The proposed problem is proven to be NP-hard by using the method of reduction to a 0-1 knapsack problem.A many-to-many matching algorithm based on resource preferences is proposed.The algorithm first establishes the mutual preference lists based on the adaptability of the task requirements and the resources provided by NCPs.This enables the filtering out of un-schedulable NCPs in the initial stage of matching,reducing the solution space dimension.To solve the matching problem between ICVs and NCPs,a new manyto-many matching algorithm is proposed to obtain a unique and stable optimal matching result.The simulation results demonstrate that the proposed scheme can improve the resource utilization of NCPs by an average of 9.6%compared to the reference scheme,and the total performance can be improved by up to 15.9%. 展开更多
关键词 Task allocation intelligent connected vehicles dispersed computing matching algorithm
下载PDF
MSADCN:Multi-Scale Attentional Densely Connected Network for Automated Bone Age Assessment
14
作者 Yanjun Yu Lei Yu +2 位作者 Huiqi Wang Haodong Zheng Yi Deng 《Computers, Materials & Continua》 SCIE EI 2024年第2期2225-2243,共19页
Bone age assessment(BAA)helps doctors determine how a child’s bones grow and develop in clinical medicine.Traditional BAA methods rely on clinician expertise,leading to time-consuming predictions and inaccurate resul... Bone age assessment(BAA)helps doctors determine how a child’s bones grow and develop in clinical medicine.Traditional BAA methods rely on clinician expertise,leading to time-consuming predictions and inaccurate results.Most deep learning-based BAA methods feed the extracted critical points of images into the network by providing additional annotations.This operation is costly and subjective.To address these problems,we propose a multi-scale attentional densely connected network(MSADCN)in this paper.MSADCN constructs a multi-scale dense connectivity mechanism,which can avoid overfitting,obtain the local features effectively and prevent gradient vanishing even in limited training data.First,MSADCN designs multi-scale structures in the densely connected network to extract fine-grained features at different scales.Then,coordinate attention is embedded to focus on critical features and automatically locate the regions of interest(ROI)without additional annotation.In addition,to improve the model’s generalization,transfer learning is applied to train the proposed MSADCN on the public dataset IMDB-WIKI,and the obtained pre-trained weights are loaded onto the Radiological Society of North America(RSNA)dataset.Finally,label distribution learning(LDL)and expectation regression techniques are introduced into our model to exploit the correlation between hand bone images of different ages,which can obtain stable age estimates.Extensive experiments confirm that our model can converge more efficiently and obtain a mean absolute error(MAE)of 4.64 months,outperforming some state-of-the-art BAA methods. 展开更多
关键词 Bone age assessment deep learning attentional densely connected network muti-scale
下载PDF
Current optimization-based control of dual three-phase PMSM for low-frequency temperature swing reduction
15
作者 Linlin Lu Xueqing Wang +3 位作者 Luhan Jin Qiong Liu Yun Zhang Yao Mao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第4期238-246,共9页
In this paper,a control scheme based on current optimization is proposed for dual three-phase permanent-magnet synchronous motor(DTP-PMSM)drive to reduce the low-frequency temperature swing.The reduction of temperatur... In this paper,a control scheme based on current optimization is proposed for dual three-phase permanent-magnet synchronous motor(DTP-PMSM)drive to reduce the low-frequency temperature swing.The reduction of temperature swing can be equivalent to reducing maximum instantaneous phase copper loss in this paper.First,a two-level optimization aiming at minimizing maximum instantaneous phase copper loss at each electrical angle is proposed.Then,the optimization is transformed to a singlelevel optimization by introducing the auxiliary variable for easy solving.Considering that singleobjective optimization trades a great total copper loss for a small reduction of maximum phase copper loss,the optimization considering both instantaneous total copper loss and maximum phase copper loss is proposed,which has the same performance of temperature swing reduction but with lower total loss.In this way,the proposed control scheme can reduce maximum junction temperature by 11%.Both simulation and experimental results are presented to prove the effectiveness and superiority of the proposed control scheme for low-frequency temperature swing reduction. 展开更多
关键词 Dual three-phase PMSM Low-frequency temperature swing Copper loss Current optimization connected neutral points
下载PDF
槲皮素通过p53-p21-Rb通路缓解慢性阻塞性肺疾病的肺衰老
16
作者 高露洋 罗丹 王文军 《西部医学》 2024年第2期217-221,227,共6页
目的 探讨槲皮素对慢性阻塞性肺疾病(COPD)小鼠肺衰老的治疗作用及机制。方法 将30只C57BL/6小鼠随机分为对照组、模型组、槲皮素组,每组10只。模型组和槲皮素组采用烟熏联合气道内滴注脂多糖(LPS)的方法构建COPD小鼠模型。造模成功后,... 目的 探讨槲皮素对慢性阻塞性肺疾病(COPD)小鼠肺衰老的治疗作用及机制。方法 将30只C57BL/6小鼠随机分为对照组、模型组、槲皮素组,每组10只。模型组和槲皮素组采用烟熏联合气道内滴注脂多糖(LPS)的方法构建COPD小鼠模型。造模成功后,槲皮素组给予槲皮素(50 mg/kg)灌胃,1次/d,持续4周;对照组和模型组给予等体积生理盐水。采用苏木精-伊红(HE)染色法观察小鼠肺组织病理改变,并评估肺部病理损伤;采用衰老相关β-半乳糖苷酶(SA-β-gal)染色法观察小鼠肺组织的衰老状况;采用免疫组化法检测肺组织中凋亡相关蛋白Bcl-2、Bax表达情况;采用蛋白质印迹(Western blot)法检测肺组织中衰老相关蛋白p53、p21、Rb表达水平。结果 与对照组比较,模型组小鼠肺组织病理损伤明显,SA-β-gal染色的阳性面积明显增加,肺组织中Bcl-2蛋白表达减少、Bax蛋白表达增多,衰老相关蛋白p53、p21、Rb表达水平明显升高(均P<0.05);与模型组比较,槲皮素组小鼠肺组织病理损伤减轻,SA-β-gal染色阳性面积减少,肺组织中Bcl-2蛋白表达增高、Bax蛋白表达均减弱,衰老相关蛋白p53、p21、Rb表达水平明显降低(均P<0.05)。结论 槲皮素可能通过下调p53-p21-Rb信号通路减轻肺组织病理损伤、抑制肺组织细胞凋亡、延缓肺组织的衰老,从而起到治疗慢性阻塞性肺疾病的作用。 展开更多
关键词 慢性阻塞性肺疾病 槲皮素 衰老 p53-p21-Rb通路
下载PDF
Evaluating the Robustness of MDSS Maintenance Forecasts Using Connected Vehicle Data
17
作者 Gregory L. Brinster Jairaj Desai +5 位作者 Myles W. Overall Christopher Gartner Rahul Suryakant Sakhare Jijo K. Mathew Nick Evans Darcy Bullock 《Journal of Transportation Technologies》 2024年第4期549-569,共21页
The Indiana Department of Transportation (INDOT) adopted the Maintenance Decision Support System (MDSS) for user-defined plowing segments in the winter of 2008-2009. Since then, many new data sources, including connec... The Indiana Department of Transportation (INDOT) adopted the Maintenance Decision Support System (MDSS) for user-defined plowing segments in the winter of 2008-2009. Since then, many new data sources, including connected vehicle data, enhanced weather data, and fleet telematics, have been integrated into INDOT winter operations activities. The objective of this study was to use these new data sources to conduct a systematic evaluation of the robustness of the MDSS forecasts. During the 2023-2024 winter season, 26 unique MDSS forecast data attributes were collected at 0, 1, 3, 6, 12 and 23-hour intervals from the observed storm time for 6 roadway segments during 13 individual storms. In total, over 888,000 MDSS data points were archived for this evaluation. This study developed novel visualizations to compare MDSS forecasts to multiple other independent data sources, including connected vehicle data, National Oceanic and Atmospheric Administration (NOAA) weather data, road friction data and snowplow telematics. Three Indiana storms, with varying characteristics and severity, were analyzed in detailed case studies. Those storms occurred on January 6th, 2024, January 13th, 2024 and February 16th, 2024. Incorporating these visualizations into winter weather after-action reports increases the robustness of post-storm performance analysis and allows road weather stakeholders to better understand the capabilities of MDSS. The results of this analysis will provide a framework for future MDSS evaluations and implementations as well as training tools for winter operation stakeholders in Indiana and beyond. 展开更多
关键词 Weather Forecasting Winter Weather connected Vehicle Data After-Action Report
下载PDF
Application of Connected Truck Data to Evaluate Spatiotemporal Impact of Rest Area Closures on Ramp Parking
18
作者 Jijo K. Mathew Jairaj Desai +1 位作者 Edward D. Cox Darcy M. Bullock 《Journal of Transportation Technologies》 2024年第3期289-307,共19页
Ensuring adequate access to truck parking is critical to the safe and efficient movement of freight traffic. There are strict federal guidelines for commercial truck driver rest periods. Rest areas and private truck s... Ensuring adequate access to truck parking is critical to the safe and efficient movement of freight traffic. There are strict federal guidelines for commercial truck driver rest periods. Rest areas and private truck stops are the only places for the trucks to stop legally and safely. In locations without sufficient parking areas, trucks often park on interstate ramps, which create safety risks for other interstate motorists. Historically, agencies have employed costly and time intensive manual counting methods, camera surveillance, and driver surveys to assess truck parking. Connected truck data, available in near real-time, offers an efficient alternative to practitioners to assess truck parking patterns and identify areas where there may be insufficient safe parking spaces. This paper presents a case study of interstate I-70 in east central Indiana and documents the observed spatiotemporal impacts of a rest area closure on truck parking on nearby interstate ramps. Results showed that there was a 28% increase in parking on ramps during the rest area closure. Analysis also found that ramps closest to the rest area were most impacted by the closure, seeing a rise in truck parking sessions as high as 2.7 times. Parking duration on the ramps during rest area closure also increased drastically. Although it was expected that this would result in increased parking by trucks on adjacent ramps, this before, during, after scenario provided an ideal scenario to evaluate the robustness of these techniques to assess changing parking characteristics of long-haul commercial trucks. The data analytics and visualization tools presented in this study are scalable nationwide and will aid stakeholders in informed data-driven decision making when allocating resources towards improving the nations commercial vehicle parking infrastructure. 展开更多
关键词 connected Truck Data Rest Areas Exit Ramps Truck Parking Commercial Vehicles
下载PDF
雷公藤多苷通过Nur77-Traf2-P62信号通路治疗溃疡性结肠炎的机制研究
19
作者 钟继红 刘勇攀 +4 位作者 陈丹丹 黄秋薇 张馨瑞 徐勤科 叶露 《中国现代医生》 2024年第11期58-62,共5页
目的研究雷公藤多苷(tripterygium glycosides,TG)对葡聚糖硫酸钠(dextran sodium sulfate,DSS)诱导的溃疡性结肠炎(ulcerative colitis,UC)小鼠结肠黏膜损伤的影响及调控机制。方法将40只小鼠采用随机数字表法分为正常组,模型组,雷公... 目的研究雷公藤多苷(tripterygium glycosides,TG)对葡聚糖硫酸钠(dextran sodium sulfate,DSS)诱导的溃疡性结肠炎(ulcerative colitis,UC)小鼠结肠黏膜损伤的影响及调控机制。方法将40只小鼠采用随机数字表法分为正常组,模型组,雷公藤多苷低、中、高剂量组(给药浓度分别为9.00、27.03、81.09mg/kg)。除正常组外,其余组小鼠均饮用5%DSS诱导UC模型。造模后,模型组小鼠予生理盐水灌胃,其余处理组小鼠予相应剂量的TG灌胃。比较各组小鼠的质量、疾病活动指数(disease activity index,DAI)、结肠病理组织学损伤情况。使用肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)、丙二醛(malondialdehyde,MDA)、超氧化物歧化酶(superoxide dismutase,SOD)试剂盒检测TNF-α、MDA、SOD水平差异。Western blot法检测结肠中Nur77、TNF受体关联因子2(tumor necrosis factor receptor-associated factor 2,Traf2)、核孔蛋白62(nucleoporin 62,P62)、自噬蛋白微管相关蛋白1轻链3(autophagy protein-microtubule associated protein1 light chain 3,LC3)分子表达。结果与空白组相比,模型组小鼠的体质量、结肠长度、SOD、Nur77、Traf2、LC3Ⅱ/LC3Ⅰ水平降低(P<0.05),DAI、结肠病理评分、TNF-α、MDA、P62水平升高(P<0.05)。与模型组相比,雷公藤多苷低、中、高剂量组小鼠体质量、结肠长度、SOD、Nur77、Traf2、LC3Ⅱ/LC3Ⅰ表达增长(P<0.05),DAI、TNF-α、MDA、P62水平均降低(P<0.05)。雷公藤多苷中、高剂量组小鼠病理评分降低(P<0.05)。结论TG能够通过Nur77-Traf2-P62信号通路治疗UC。 展开更多
关键词 雷公藤多苷 溃疡性结肠炎 Nur77-Traf2-p62信号通路 自噬
下载PDF
绿原酸对肾癌A498和769-P细胞增殖、迁移和侵袭的影响 被引量:1
20
作者 陈海滨 王立姣 +1 位作者 赵建军 谭超 《现代泌尿外科杂志》 CAS 2023年第5期436-440,共5页
目的探讨绿原酸对肾癌A498和769-P细胞增殖、迁移和侵袭的影响以及其可能的分子机制。方法取人肾癌A498或769-P细胞培养,分为对照组和绿原酸(2μL,1μmol/L)组,培养72 h。采用MTT法检测细胞增殖能力;Transwell小室法检测细胞侵袭能力;... 目的探讨绿原酸对肾癌A498和769-P细胞增殖、迁移和侵袭的影响以及其可能的分子机制。方法取人肾癌A498或769-P细胞培养,分为对照组和绿原酸(2μL,1μmol/L)组,培养72 h。采用MTT法检测细胞增殖能力;Transwell小室法检测细胞侵袭能力;划痕实验检测细胞迁移能力;ELISA法检测细胞上清液中IL-1β水平;qRT-PCR法检测细胞EPAS-1表达;Western blot检测细胞AKT/P65信号通路相关蛋白表达。结果绿原酸能抑制胃癌A498或769-P细胞增殖、侵袭和迁移的能力,降低细胞上清液中IL-1β水平。qRT-PCR和Western blot检测结果显示,与对照组比较,加入anti-IL-1β后,肾癌A498或769-P细胞中EPAS-1 mRNA及p-AKT、p-P65蛋白表达水平降低;与对照组比较,绿原酸组肾癌A498或769-P细胞中EPAS-1 mRNA及p-AKT、p-P65蛋白表达水平降低(P<0.05)。结论绿原酸能抑制肾癌细胞增殖、侵袭及迁移,其机制可能与抑制细胞IL-1β的分泌,从而抑制AKT/P65/EPAS-1通路有关。 展开更多
关键词 绿原酸 肾癌A498细胞 肾癌769-p细胞 迁移与侵袭 EPAS-1
下载PDF
上一页 1 2 92 下一页 到第
使用帮助 返回顶部