检索结果-南通市图书馆

Fixed points of smoothing transformation in random environment

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2021年第4期16卷 1191-1210页

作者： xiaoyue zhang Wenming HONG School of Statistics Capital University of Economics and BusinessBeijing 100070China School of Mathematical Sciences Laboratory of Mathematics and Complex SystemsBeijing Normal UniversityBeijing 100875China

At each time n∈N,let Y^(n)(ξ)=(y^(n)_(1)(ξ),y^(n)_(2)(ξ),…)be a random sequence of non-negative numbers that are ultimately zero in a random environmentξ=(ξ_(n))n∈*** existence and uniqueness of the non-negative fixed points of the associated smoothing transformation in random environment are *** fixed points are solutions to the distributional equation for a.e.ξ,Z(ξ)=dΣ_(i∈N_(+))y^(0)_(i)(ξ)Z^(1)_(i)(ξ),where{Z^(1)_(i):i∈N_(+)}are random variables in random environment which satisfy that for any environmentξ,under P_(ξ),{Z^(1)_(i)(ξ):i∈N_(+)}are independent of each other and Y^(0)(ξ),and have the same conditional distribution P_(ξ)(Z^(1)_(i)(ξ)∈·)=P_(Tξ)(Z(Tξ)∈·),where T is the shift *** extends the classical results of ***[***.,1977,14:25-37]to the random environment *** an application,the martingale convergence of the branching random walk in random environment is given as well.

关键词： Smoothing transformation functional equation branching random walk random environment martingales

超声测量胃窦横截面积指导脓毒症患者早期个体化肠内营养实施的应用价值分析

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华急诊医学杂志 2024年第2期33卷 193-200页

作者：李探张潇月刘克琴曾浩唐振东邵龙刚南京中医药大学第二附属医院(江苏省第二中医院)急诊科南京210017 南京中医药大学南京210023

目的探索床旁超声测量胃窦横截面积(CSA)指导脓毒症患者的早期个体化肠内营养的价值。方法纳入2021年1月至2022年12月间南京中医药大学第二附属医院EICU和综合ICU收治的脓毒症患者各30例,EICU患者采用床旁超声测量胃窦CSA指导脓毒症患... 详细信息

目的探索床旁超声测量胃窦横截面积(CSA)指导脓毒症患者的早期个体化肠内营养的价值。方法纳入2021年1月至2022年12月间南京中医药大学第二附属医院EICU和综合ICU收治的脓毒症患者各30例,EICU患者采用床旁超声测量胃窦CSA指导脓毒症患者的早期肠内营养实施,综合ICU采用常规的营养治疗策略。统计分析CSA与脓毒症胃肠功能障碍患者发生喂养不耐受的相关性,绘制ROC曲线,获取最佳截断值;并分析与胃肠功能障碍的其他相关指标[胃肠功能障碍评分、SOFA评分、APACHEⅡ评分、腹内压(IAP)、血清前蛋白(PA)/白蛋白(Alb)]的相关性。对比两组患者不同策略的肠内营养实施后的炎症相关指标、营养状态指标、ICU住院天数等,分析不同策略的优劣性。结果两组患者的基线资料均衡可比;超声治疗组在第1天发现喂养不耐受的发生率(36.67%)显著高于常规治疗组(10.00%),经积极早期的个体化治疗,第3天发生率仅为10.00%,显著低于常规治疗组(40.00%);治疗至第5天,超声治疗组的相关功能评分(胃肠功能障碍评分、APACHEⅡ评分、SOFA评分、IAP)、营养状态指标(5 d热卡达标率、PA、Alb)及炎症相关指标(WBC、PCT、hs-CRP)较入院时均显著改善,且优于常规治疗组,另外超声治疗组患者的ICU住院天数及误吸发生率更低(P<0.05);CSA与胃肠功能障碍评分、APACHEⅡ评分、SOFA评分、IAP、PA、Alb均具有良好的相关性,相关系数分别为0.79、0.60、0.66、0.71、-0.67和-0.64,均P<0.05;CSA对喂养不耐受预测的ROC曲线显示AUC为0.828,95%CI为0.737~0.919,其预测喂养不耐受的最佳截断值为7.835 cm2,其敏感度和特异度分别为88.20%和71.80%。结论超声测量CSA能够早期、有效地发现脓毒症患者喂养不耐受,据此给予个体化的肠内营养实施策略,显著改善了患者的器官功能评分、营养状态及炎症指标,减少ICU的住院天数及误吸发生,与常规的评价指标有良好的相关性,且敏感度和特异度均较高,值得临床进一步推广。

关键词：脓毒症超声胃窦横截面积喂养不耐受胃肠道功能障碍个体化肠内营养实施

Extremum of a time-inhomogeneous branching random walk

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2021年第2期16卷 459-478页

作者： Wanting HOU xiaoyue zhang Wenming HONG Department of Mathematics Northeastern UniversityShenyang 110004China School of Statistics Capital University of Economics and BusinessBeijing 100070China School of Mathematical Sciences&Laboratory of Mathematics and Complex Systems Beijing Normal UniversityBeijing 100875China

Consider a time-inhomogeneous branching random walk, generated by the point process Ln which composed by two independent parts: ‘branching’offspring Xn with the mean 1+B(1+n)−β for β∈(0,1) and ‘displacement’ ξn with a drift A(1+n)^(−2α) for α∈(0,1/2), where the ‘branching’ process is supercritical for B>0 but ‘asymptotically critical’ and the drift of the ‘displacement’ ξn is strictly positive or negative for |A|>0 but ‘asymptotically’ goes to zero as time goes to infinity. We find that the limit behavior of the minimal (or maximal) position of the branching random walk is sensitive to the ‘asymptotical’ parameter β and α.

关键词： Branching random walk time-inhomogeneous branching process random walk

Molecular mechanism of Verticillium dahliae-induced leaf senescence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2021年第11期14卷 1785-1786页

作者： Wenkun Zhou xiaoyue zhang State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijingChina State Key Laboratory of Plant Genomics National Center for Plant Gene Research(Beijing)Institute of Genetics and Developmental BiologyInnovation Academy of Seed DesignChinese Academy of SciencesBeijingChina

Verticillium dahliae is a soil-borne hemibiotrophic fungus that affects a wide range of hosts,including important crops(such as cotton,tomato,potatoes,cauliflower,and sunflower)and the model plant Arabidopsis(Fradin and Thomma,2006).*** infections can result in significant crop losses as no effective fungicides are available at the *** infection,*** causes verticillium wilt,leaf chlorosis and cell death,and precocious senescence in host plants(Fradin and Thomma,2006).Leaf senescence is known to be regulated by developmental age,plant hormones(e.g.,ethylene),and a variety of environmental factors(Woo et al.,2019),but how *** induces leaf senescence in its host plants is not clear.

关键词： mechanism Molecular crops

无缝隙流程化闭环模式在血管外科介入手术患者中的应用效果研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

黑龙江科学 2024年第16期15卷 134-136页

作者：刘宇双张潇月吉林大学中日联谊医院长春130000

探讨无缝隙流程化闭环模式在血管外科介入手术患者中的应用效果。选择血管外科接受介入手术的150例患者作为研究对象,将其分为对照组和实验组,每组各75例患者。比较两组患者的手术指标、护理前后的疼痛评分、消极情绪、护理水平以及护... 详细信息

探讨无缝隙流程化闭环模式在血管外科介入手术患者中的应用效果。选择血管外科接受介入手术的150例患者作为研究对象,将其分为对照组和实验组,每组各75例患者。比较两组患者的手术指标、护理前后的疼痛评分、消极情绪、护理水平以及护理满意度。结果表明,与对照组相比,实验组的手术准备、手术时长以及术后住院时间均显著缩短,护理后疼痛和负面情绪得分均显著降低(P<0.05),实验组的护理质量和护理满意度显著高于对照组(P<0.05),说明无缝隙流程化闭环模式可以显著提升患者的手术效果和护理质量,缓解其疼痛和消极情绪,在确保手术安全的前提下优化患者的护理体验。

关键词：无缝隙流程化闭环模式血管外科介入手术护理质量

Small bending, big curvature^(FA)

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2022年第1期64卷 3-4页

作者： Wenkun Zhou xiaoyue zhang State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Genomics National Center for Plant Gene Research(Beijing)Institute of Genetics and Developmental BiologyInnovation Academy of Seed Designthe Chinese Academy of SciencesBeijing 100101China

The classical"Cholodny-Went theory"predicted that directional stimuli trigger the redistribution of auxin,which governs the differential growth of plant organs through potent effects on cell expansion,thereby establishing an"auxin-then-growth"paradigm;this theory has been validated for both gravitropism and phototropism in plants(reviewed in Muthert et al.,2020).

关键词： curvature thereby establishing

Investigating effects of nano-particles infiltrat

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 989-995页

作者： zhang xiaoyue zhang Yong ZHENG Yue WANG Biao School of Engineering Sun Yat-sen University Guangzhou 510275 China State Key Laboratory of Optoelectronic Materials and Technologies/Institute of Optoelectronic and Functional Composite Materials School of Physics and Engineering Sun Yat-sen University Guangzhou 510275 China

In this paper,we introduce our finding of the effects of C_(60) nanoparticles (NP) infiltration on mechanical properties of cell and its *** force microscopy (AFM) is used to perform indentation on both normal and C_(60) infiltrated red blood cells (RBC) to gain data of mechanical characteristics of the *** results show that the mechanical properties of human RBC membrane seem to be altered due to the presence of C_(60) *** resistance and ultimate strength of the C_(60) infiltrated RBC membrane significantly *** also explain the mechanism of how C_(60) NPs infiltration changes the mechanical properties of the cell membrane by predicting the structural change of the lipid bilayer caused by the C_(60) infiltration at molecular level and analyze the interactions among molecules in the lipid *** potential hazards and application of the change in mechanical characteristics of the RBCs membrane are also *** of C_(60) NPs may be significant for some biological cells.

关键词： human red blood cell mechanical properties C_(60) nano-particles infiltration atomic force microscope

银中杨中5条PaMYBs基因克隆及表达特性分析

在线全文

学校读者我要写书评

暂无评论

分子植物育种 2024年第6期22卷 1850-1860页

作者：张潇月袁启航郑雨姜静刘桂丰东北林业大学林木遗传育种国家重点实验室哈尔滨150040

MYB转录因子是植物中重要的转录因子之一,不仅参与体类黄酮、花青素等合成过程,同时在植物抵御非生物胁迫过程中也起重要作用。本研究以银中杨叶片和花序为材料克隆获得5条R2R3-MYB转录因子(PaMYB116, PaMYB117, Pa MYB118, PaMYB119, P... 详细信息

MYB转录因子是植物中重要的转录因子之一,不仅参与体类黄酮、花青素等合成过程,同时在植物抵御非生物胁迫过程中也起重要作用。本研究以银中杨叶片和花序为材料克隆获得5条R2R3-MYB转录因子(PaMYB116, PaMYB117, Pa MYB118, PaMYB119, PaMYB120),分析显示,5条PaMYBs的ORF分别为789、777、822、825和750 bp,与拟南芥AtMYB113是同源基因,是与花色苷合成相关的旁系同源物。RT-qPCR表明,PaMYB116在花序中表达量最高,PaMYB118、PaMYB120在茎中表达量最高,PaMYB117则在各组织部位中表达量均较低。在银中杨基因组数据中找到5条PaMYBs启动子序列并分别预测其顺式作用元件,根据预测结果分别进行光和ABA处理银中杨,RT-qPCR结果显示:5条PaMYBs基因均可被光诱导表达,其中PaMYB116、PaMYB117、PaMYB118、PaMYB119基因暗处理3 d后进行光照射,1 h后上述基因表达量迅速增加,而PaMYB120则不同,光照48 h时该基因的相对表达量最高;而喷施200μmol/L ABA处理下5条PaMYBs基因的相对表达量均降低。研究结果为揭示银中杨PaMYB基因提供参考。

关键词：银中杨 R2R3-MYB 表达特性非生物胁迫

骨碎补总黄酮双水相提取工艺优化及抗氧化活性研究

在线全文

学校读者我要写书评

暂无评论

饲料工业 2024年第13期45卷 120-128页

作者：钱慧琴方李珂唐丽杰张青瑾张宵悦李彦灵新乡医学院三全学院河南新乡453003 新乡医学院河南新乡453003

试验旨在优化超声辅助PEG400-(NH_(4))_(2)SO_(4)双水相体系提取骨碎补中总黄酮的工艺,并对骨碎补中总黄酮的抗氧化活性进行评价。在单因素试验的基础上,以(NH_(4))_(2)SO_(4)质量分数、PEG400质量分数、超声功率以及超声时间为自变量,... 详细信息

试验旨在优化超声辅助PEG400-(NH_(4))_(2)SO_(4)双水相体系提取骨碎补中总黄酮的工艺,并对骨碎补中总黄酮的抗氧化活性进行评价。在单因素试验的基础上,以(NH_(4))_(2)SO_(4)质量分数、PEG400质量分数、超声功率以及超声时间为自变量,以骨碎补中总黄酮得率为因变量,采取响应面法优化骨碎补中总黄酮的提取工艺。以维生素C为阳性对照,分别测定骨碎补总黄酮对1,1-二苯基-2-苦基肼自由基(1,1-Diphenyl-2-picryl-hydrazyl radical,DPPH·)、羟基自由基(Hydroxyl radical,·OH)的清除能力和铁还原力。结果表明:骨碎补中总黄酮的最佳提取工艺为PEG400质量分数19%,(NH_(4))_(2)SO_(4)质量分数19%,超声功率180 W,超声时间40 min,该条件下骨碎补总黄酮得率为183.29 mg/g,与理论预测值接近。抗氧化活性分析表明,在一定的浓度范围内,骨碎补总黄酮对DPPH·、·OH的清除能力和铁还原力随浓度的增加不断增强并趋于稳定。以PEG400-(NH_(4))_(2)SO_(4)双水相体系提取骨碎补中总黄酮的方法可行,且最佳工艺条件可靠。

关键词：骨碎补总黄酮双水相超声波提取响应面法