期刊文献+
共找到1,891篇文章
< 1 2 95 >
每页显示 20 50 100
(n,m)-半群上的格林**关系 被引量:2
1
作者 贾维莉 李刚 顾兆军 《山东师范大学学报(自然科学版)》 CAS 2013年第4期4-6,共3页
将格林* *关系从普通半群推广到(n,m)-半群上,从而定义了左同余、右同余、拟强wrpp(n,m)-半群、强wrpp(n,m)-半群,并讨论它们的基础性质.
关键词 (n m)-半群 左同余 右同余 拟强wrpp(n m)-半群 强wrpp(n m)-半群
下载PDF
m(n)相依样本回归函数改良近邻估计的强相合性
2
作者 秦更生 杜斌 《四川大学学报(自然科学版)》 CAS CSCD 1995年第2期128-134,共7页
研究同分布的m(n)相依样本序列回归函数改良近邻估计的强相合性,同时给出改良近邻估计的强收敛速度。
关键词 m(n)相依样本 回归函数 改良近邻估计 强相合性
下载PDF
剩余类环Zm上的自由模Z^(n)m 被引量:1
3
作者 段炼 《新乡师范高等专科学校学报》 1999年第2期 86-89,共4页
本文引入剩余类环Zm上“n数组”线性相关等有关概念,运用模的理论对Z^(n)m的结构性质进行研究。
关键词 剩余类环 线性相关 Zm-模 自由模 替换定理 Zm Z^(n)m
下载PDF
特征p=2的Cartan型李代数H(n,m)的导子代数
4
作者 王颖 张永正 《Chinese Quarterly Journal of Mathematics》 CSCD 1994年第2期93-101,共9页
In this paper,we determine the derivation algebra of non-restricted Lie algebra H(n,m) of Cartan type in characteristic p=2.The main reault is following;Der(Hn,m))=adH(n,m)(H^m(n,m+Fd).
关键词 特征p=2 Cartan型李代数H(n m) 导子代数
下载PDF
The Synthesis and Crystal Structure of [(n-Bu)4N]2 (C20H1402)2M02O7
5
作者 LuXiaoming GengZhe TuShujie LiuShuneheng 《首都师范大学学报(自然科学版)》 1997年第2期52-56,共5页
The title eompplex:
关键词 [(n-Bu)4n]2(C20H1402)2m02O7 合成方法 结构研究 晶体
下载PDF
The molecular orbital investigation of the metal triply bonded compounds M_2X_2(NMe_2)_4
6
作者 LiMing FuWentao DengChuanyue 《西南师范大学学报(自然科学版)》 CAS CSCD 1994年第4期403-408,共6页
ThemolecularorbitalinvestigationofthemetaltriplybondedcompoundsM_2X_2(NMe_2)_4LiMing,FuWentao,DengChuanyue(D... ThemolecularorbitalinvestigationofthemetaltriplybondedcompoundsM_2X_2(NMe_2)_4LiMing,FuWentao,DengChuanyue(DepartmentofChemis... 展开更多
关键词 金属三重键 化合物 分子轨道
下载PDF
Peterson图和图D_(m,n)的边PI指数
7
作者 张丽 张辉 红霞 《宁夏师范学院学报》 2024年第4期5-15,共11页
利用分析法和分类讨论法,给出Peterson图和D_(m,n)图的边PI指数计算公式,丰富了图的PI指数理论.
关键词 边PI指数 Peterson 图Dm n
下载PDF
指数有界双连续n阶m次积分C群的指数公式
8
作者 贺凯丽 赵华新 刘娟娟 《西南民族大学学报(自然科学版)》 CAS 2024年第2期199-205,共7页
利用经典算子半群理论中的研究方法,基于指数有界双连续n阶m次积分C群和预解式的定义,给出指数有界双连续n阶m次积分C群与其预解式间积分的表示关系,得到指数有界双连续n阶m次积分C群的指数公式,从而推广了n阶m次积分C半群的相关结果,... 利用经典算子半群理论中的研究方法,基于指数有界双连续n阶m次积分C群和预解式的定义,给出指数有界双连续n阶m次积分C群与其预解式间积分的表示关系,得到指数有界双连续n阶m次积分C群的指数公式,从而推广了n阶m次积分C半群的相关结果,丰富了算子半群理论的研究内容. 展开更多
关键词 双连续nm次积分C群 指数公式 指数有界 预解式
下载PDF
Clinical outcome and prognostic factors of T4N0M0 colon cancer after R0 resection:A retrospective study 被引量:1
9
作者 Bang Liu Zhao-Xiong Zhang +3 位作者 Xin-Yang Nie Wei-Lin Sun Yong-Jia Yan Wei-Hua Fu 《World Journal of Gastrointestinal Oncology》 SCIE 2024年第5期1869-1877,共9页
BACKGROUND Paradoxically,patients with T4N0M0(stage II,no lymph node metastasis)colon cancer have a worse prognosis than those with T2N1-2M0(stage III).However,no previous report has addressed this issue.AIM To screen... BACKGROUND Paradoxically,patients with T4N0M0(stage II,no lymph node metastasis)colon cancer have a worse prognosis than those with T2N1-2M0(stage III).However,no previous report has addressed this issue.AIM To screen prognostic risk factors for T4N0M0 colon cancer and construct a prognostic nomogram model for these patients.METHODS Two hundred patients with T4N0M0 colon cancer were treated at Tianjin Medical University General Hospital between January 2017 and December 2021,of which 112 patients were assigned to the training cohort,and the remaining 88 patients were assigned to the validation cohort.Differences between the training and validation groups were analyzed.The training cohort was subjected to multi-variate analysis to select prognostic risk factors for T4N0M0 colon cancer,followed by the construction of a nomogram model.RESULTS The 3-year overall survival(OS)rates were 86.2%and 74.4%for the training and validation cohorts,respectively.Enterostomy(P=0.000),T stage(P=0.001),right hemicolon(P=0.025),irregular review(P=0.040),and carbohydrate antigen 199(CA199)(P=0.011)were independent risk factors of OS in patients with T4N0M0 colon cancer.A nomogram model with good concordance and accuracy was constructed.CONCLUSION Enterostomy,T stage,right hemicolon,irregular review,and CA199 were independent risk factors for OS in patients with T4N0M0 colon cancer.The nomogram model exhibited good agreement and accuracy. 展开更多
关键词 T4n0m0 colon cancer PROGnOSIS multivariate analysis nOmOGRAm Colon cancer
下载PDF
(m,n)-内射和(m,n)-平坦函子
10
作者 朱军 赵仁育 《兰州理工大学学报》 CAS 北大核心 2024年第2期142-147,共6页
设R是有单位元的结合环,m和n是两个固定的正整数.引入了(m,n)-内射函子和(m,n)-平坦函子的概念,研究了这两类函子的一些性质,利用(m,n)-内射函子和(m,n)-平坦函子给出了(m,n)-凝聚环和Von Neumann正则环的一些等价刻画.
关键词 (m n)-内射函子 (m n)-平坦函子 (m n)-凝聚环 Von neumann正则环 (预)覆盖 (预)包络
下载PDF
m6A RNA甲基化调控因子在食管腺癌中的表达谱及其临床意义研究
11
作者 马爽 唐锦浩 +1 位作者 王在瑞 赵晓慧 《岭南急诊医学杂志》 2024年第5期554-557,共4页
目的:探讨N6-甲基腺苷(m6A)RNA甲基化调控因子在食管腺癌中的表达模式及其预后价值,构建基于m6A调控因子的风险模型,用于预测患者生存并寻找新的治疗靶点。方法:从TCGA数据库获取81名食管腺癌患者和11名对照患者的RNA-seq数据及临床预... 目的:探讨N6-甲基腺苷(m6A)RNA甲基化调控因子在食管腺癌中的表达模式及其预后价值,构建基于m6A调控因子的风险模型,用于预测患者生存并寻找新的治疗靶点。方法:从TCGA数据库获取81名食管腺癌患者和11名对照患者的RNA-seq数据及临床预后信息。使用Limma包分析m6A RNA甲基化调控因子的表达与临床病理特征间的关系,采用Cox回归和LASSO算法构建包含五个m6A因子的风险模型。结果:17个m6A因子在食管腺癌组织中的表达显著高于正常组织。YTHDC2、EIF3A与T、N分期,IGF22BP1与远处转移相关。Cox分析和LASSO回归确定RBMX、HNRNPA2B1、WTAP、VIRMA四个预后因子并构建风险模型。Kaplan-Meier分析显示,高风险患者生存率显著低于低风险组。结论:m6A因子的表达与食管腺癌患者的临床特征密切相关,所构建的风险模型为预后预测和个性化治疗提供了新参考。 展开更多
关键词 食管腺癌 n6-甲基腺苷(m6A) 预后
下载PDF
一类广义K(m,n)方程的行波解
12
作者 赵传业 朱能 +2 位作者 张艳芬 阮小军 钟希杰 《南昌大学学报(理科版)》 CAS 2024年第3期214-220,230,共8页
运用微分方程定性理论和动力系统分支方法,研究了一类广义K(m,n)方程的行波解。考虑了两种情形:K(1,3,2)方程和K(2,3,3)方程。在不同的参数条件下,得到K(1,3,2)方程的紧孤子和K(2,3,3)方程的紧孤子及周期爆破波解。进一步通过数值模拟,... 运用微分方程定性理论和动力系统分支方法,研究了一类广义K(m,n)方程的行波解。考虑了两种情形:K(1,3,2)方程和K(2,3,3)方程。在不同的参数条件下,得到K(1,3,2)方程的紧孤子和K(2,3,3)方程的紧孤子及周期爆破波解。进一步通过数值模拟,分析其系统的分支相图和行波解的波形图。 展开更多
关键词 分支方法 K(m n)方程 紧孤子 周期爆破波解
下载PDF
M1基因模式差异对H9N2亚型禽流感病毒增殖特性的影响
13
作者 刘畅 丛郁霖 +3 位作者 朱艳婷 李思琦 孙艺学 丛彦龙 《中国家禽》 北大核心 2024年第11期18-24,共7页
为探究基质蛋白1(M1)对H9N2亚型禽流感病毒适应性的影响,研究基于M1的5种主要模式,利用反向遗传技术拯救了5株具有不同M1基因模式的H9N2亚型禽流感病毒,通过测定病毒的一步与多步生长曲线以及生长竞争优势试验探讨M1对H9N2亚型禽流感病... 为探究基质蛋白1(M1)对H9N2亚型禽流感病毒适应性的影响,研究基于M1的5种主要模式,利用反向遗传技术拯救了5株具有不同M1基因模式的H9N2亚型禽流感病毒,通过测定病毒的一步与多步生长曲线以及生长竞争优势试验探讨M1对H9N2亚型禽流感病毒增殖能力的影响,将MOI均为0.001的5株病毒共感染MDCK细胞,感染后48h提取细胞上清的病毒RNA,将反转录的cDNA样品进行单核苷酸多态性(SNP)测序。结果显示:M1为P5模式的H9N2亚型禽流感病毒增殖能力显著高于其余4株病毒(P<0.05),P5模式病毒的M1基因所涉及的9个可检测的氨基酸位点占比超过74%。研究表明,M1为P5模式的H9N2亚型禽流感病毒具有最强的增殖能力和明显的生长竞争优势,结果从M1对病毒增殖能力影响角度解释了该分支病毒在我国禽群中广泛流行的原因。 展开更多
关键词 禽流感 H9n2亚型 m1 模式差异 增殖能力
下载PDF
Learning Sequential and Structural Dependencies Between Nucleotides for RNA N6-Methyladenosine Site Identification
14
作者 Guodong Li Bowei Zhao +4 位作者 Xiaorui Su Dongxu Li Yue Yang Zhi Zeng Lun Hu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2024年第10期2123-2134,共12页
N6-methyladenosine(m6A)is an important RNA methylation modification involved in regulating diverse biological processes across multiple species.Hence,the identification of m6A modification sites provides valuable insi... N6-methyladenosine(m6A)is an important RNA methylation modification involved in regulating diverse biological processes across multiple species.Hence,the identification of m6A modification sites provides valuable insight into the biological mechanisms of complex diseases at the post-transcriptional level.Although a variety of identification algorithms have been proposed recently,most of them capture the features of m6A modification sites by focusing on the sequential dependencies of nucleotides at different positions in RNA sequences,while ignoring the structural dependencies of nucleotides in their threedimensional structures.To overcome this issue,we propose a cross-species end-to-end deep learning model,namely CR-NSSD,which conduct a cross-domain representation learning process integrating nucleotide structural and sequential dependencies for RNA m6A site identification.Specifically,CR-NSSD first obtains the pre-coded representations of RNA sequences by incorporating the position information into single-nucleotide states with chaos game representation theory.It then constructs a crossdomain reconstruction encoder to learn the sequential and structural dependencies between nucleotides.By minimizing the reconstruction and binary cross-entropy losses,CR-NSSD is trained to complete the task of m6A site identification.Extensive experiments have demonstrated the promising performance of CR-NSSD by comparing it with several state-of-the-art m6A identification algorithms.Moreover,the results of cross-species prediction indicate that the integration of sequential and structural dependencies allows CR-NSSD to capture general features of m6A modification sites among different species,thus improving the accuracy of cross-species identification. 展开更多
关键词 Cross-domain reconstruction cross-species prediction n6-methyladenosine(m6A)modification site RnA sequence sequential and structural dependencies
下载PDF
cT1N0M0期食管癌内镜下非治愈性切除的研究进展
15
作者 吴振坤(综述) 王贵齐(审校) 《中国肿瘤临床》 CAS CSCD 北大核心 2024年第5期253-257,共5页
随着消化内镜诊疗活动的广泛开展,内镜下切除已成为cT1N0M0期食管癌的标准治疗方案之一。然而,术后病理确认的非治愈性切除患者仍然面临复杂的后续管理选择。本文就cT1N0M0期食管癌内镜下非治愈性切除的国内外研究进展进行综述,指出现... 随着消化内镜诊疗活动的广泛开展,内镜下切除已成为cT1N0M0期食管癌的标准治疗方案之一。然而,术后病理确认的非治愈性切除患者仍然面临复杂的后续管理选择。本文就cT1N0M0期食管癌内镜下非治愈性切除的国内外研究进展进行综述,指出现有指南有关非治愈性切除的定义尚存争议,同时针对这部分患者,应在临床实践中制定选择性的个体化管理策略。 展开更多
关键词 内镜下切除 内镜黏膜下剥离术 非治愈性切除 cT1n0m0期 食管鳞癌
下载PDF
H9N2亚型禽流感病毒M1和NA基因在昆虫细胞中的表达
16
作者 王粲 张民秀 +6 位作者 谢芝勋 李孟 罗思思 李丹 阮志华 谢丽基 谢志勤 《中国动物检疫》 CAS 2024年第4期103-110,共8页
为通过昆虫细胞表达出H9N2亚型禽流感病毒M1和NA蛋白,并鉴定其免疫活性,利用PCR技术扩增H9N2亚型禽流感病毒M1和NA基因,以pFastBacDual为转移载体构建重组转移载体pFastBacDual-M1和pFastBacDual-NA;将阳性重组转移载体分别转化至DH10Ba... 为通过昆虫细胞表达出H9N2亚型禽流感病毒M1和NA蛋白,并鉴定其免疫活性,利用PCR技术扩增H9N2亚型禽流感病毒M1和NA基因,以pFastBacDual为转移载体构建重组转移载体pFastBacDual-M1和pFastBacDual-NA;将阳性重组转移载体分别转化至DH10Bac感受态细胞,得到重组杆粒rBacmid-M1和rBacmid-NA;将重组杆粒分别转染Sf9昆虫细胞,获得含M1和NA基因的重组杆状病毒rBV-M1和rBV-NA;运用IFA和Western-blot鉴定M1和NA蛋白的表达情况,同时以NA蛋白为包被抗原,运用间接ELISA方法鉴定NA蛋白的反应活性。结果显示,IFA鉴定均出现特异性绿色荧光,Western-blot检测M1和NA蛋白大小分别约为28和52 ku,ELISA检测NA蛋白对抗H9N2阳性血清有很高的反应值。结果表明,M1和NA蛋白可在昆虫细胞中特异性表达且具有反应原性。本试验为进一步研发H9N2亚型禽流感诊断技术和疫苗奠定了基础。 展开更多
关键词 禽流感病毒 H9n2亚型 m1蛋白 nA蛋白 Bac-to-Bac杆状病毒表达系统
下载PDF
Comparative Study of the Physicochemical Quality of the Waters of the Méné River (Sassandra Watershed, Ivory Coast) in the Dry Season and in the Rainy Season
17
作者 Konan Lopez Kouamé Gansso Valentin Akilinon +2 位作者 Olivier Simon Mananga Kombo Gneneyougo Emile Soro Bi Tié Albert Goula 《Journal of Environmental Protection》 2024年第6期738-746,共9页
The study carried out on the waters of the Méné River led to an overall assessment of its water quality during the dry season and the rainy season. The analysis focused on eight (8) water samples taken from ... The study carried out on the waters of the Méné River led to an overall assessment of its water quality during the dry season and the rainy season. The analysis focused on eight (8) water samples taken from the river during a period of dry season (January-February) and a period of rainy season (June and September). The various physicochemical parameters were measured according to Afnor standardized methods. The readings of temperature, turbidity, pH and conductivity made it possible to account for the disturbances occurring in water quality. A temporal variation correlated with the seasons (dry or rainy) is noted. Turbidity depends on the concentration of suspended solids (SS) in the water and drained particles and therefore on the seasons. Just like the temperature, the conductivity changes with the season. The waters of the Méné River are generally acidic. The results obtained show that there is a low level of pollution by chlorides, phosphates, nitrites and nitrates. A slight pollution of the waters of Méné in organic matter (chemical oxygen demand values are less than 25 mg∙L−1 during dry season and 32.33 ± 4.73 mg∙L−1 during rainy season) was observed. The concentrations of metallic trace elements such as iron, manganese and aluminum indicate significant pollution of these waters by these elements. Overall, the waters of the Méné River are of satisfactory quality because all the physicochemical parameters analyzed have values below standards during the dry season as well as during the rainy season with the exception of COD and a few metallic trace elements. 展开更多
关键词 méné Physicochemical Parameters RIVER SEASOn Water Quality
下载PDF
Comparative efficacy and safety between endoscopic submucosal dissection,surgery and definitive chemoradiotherapy in patients with cT1N0M0 esophageal cancer
18
作者 Shu-Ai Luo Yu-Ying Sun +1 位作者 Ya-Ting Zeng Chun-Yu Huang 《World Journal of Gastrointestinal Endoscopy》 2024年第2期72-82,共11页
BACKGROUND Endoscopic submucosal dissection(ESD)and surgical resection are the standard of care for cT1N0M0 esophageal cancer(EC),whereas definitive chemoradiotherapy(d-CRT)is a treatment option.Nevertheless,the compa... BACKGROUND Endoscopic submucosal dissection(ESD)and surgical resection are the standard of care for cT1N0M0 esophageal cancer(EC),whereas definitive chemoradiotherapy(d-CRT)is a treatment option.Nevertheless,the comparative efficiency and safety of ESD,surgery and d-CRT for cT1N0M0 EC remain unclear.AIM To compare the efficiency and safety of ESD,surgery and d-CRT for cT1N0M0 EC.METHODS We retrospectively analyzed the hospitalized data of a total of 472 consecutive patients with cT1N0M0 EC treated at Sun Yat-sen University Cancer center between 2017-2019 and followed up until October 30th,2022.We analyzed demographic,medical recorded,histopathologic characteristics,imaging and endoscopic,and follow-up data.The Kaplan-Meier method and Cox proportional hazards modeling were used to analyze the difference of survival outcome by treatments.Inverse probability of treatment weighting(IPTW)was used to minimize potential confounding factors.RESULTS We retrospectively analyzed patients who underwent ESD(n=99)or surgery(n=220)or d-CRT(n=16)at the Sun Yat-sen University Cancer Center from 2017 to 2019.The median follow-up time for the ESD group,the surgery group,and the d-CRT group was 42.0 mo(95%CI:35.0-60.2),45.0 mo(95%CI:34.0-61.75)and 32.5 mo(95%CI:28.3-40.0),respectively.After adjusting for background factors using IPTW,the highest 3-year overall survival(OS)rate and 3-year recurrence-free survival(RFS)rate were observed in the ESD group(3-year OS:99.7% and 94.7% and 79.1%;and 3-year RFS:98.3%,87.4% and 79.1%,in the ESD,surgical,and d-CRT groups,respectively).There was no difference of severe complications occurring between the three groups(P≥0.05).Multivariate analysis showed that treatment method,histology and depth of infiltration were independently associated with OS and RFS.CONCLUSION For cT1N0M0 EC,ESD had better long-term survival and lower hospitalization costs than those who underwent d-CRT and surgery,with a similar rate of severe complications occurring. 展开更多
关键词 Retrospective study cT1n0m0 Esophageal squamous cell carcinoma Endoscopic submucosal dissection SURGERY Definitive chemoradiotherapy
下载PDF
E-三角范畴中的(n, m)-强ξ-Gorenstein投射对象
19
作者 郭雯珺 《理论数学》 2024年第4期268-275,共8页
设C是一个E-三角范畴,ξ是C中的一个E-三角真类。在C中引入(n, m)-强ξ-Gorenstein投射对象的概念,研究了C中的对象与其合冲的这种ξ-Gorenstein投射性质之间的联系。作为应用,证明了ξ中对象X的ξ-Gorenstein投射维数小于等于m当且仅... 设C是一个E-三角范畴,ξ是C中的一个E-三角真类。在C中引入(n, m)-强ξ-Gorenstein投射对象的概念,研究了C中的对象与其合冲的这种ξ-Gorenstein投射性质之间的联系。作为应用,证明了ξ中对象X的ξ-Gorenstein投射维数小于等于m当且仅当存在C中的ξ-Gorenstein投射对象G,使得是(1, m)-强ξ-Gorenstein投射的。 展开更多
关键词 ξ-Gorenstein投射对象 ξ-Gorenstein投射维数 (n m)-强ξ-Gorenstein投射对象 合冲
下载PDF
三星体R_(n-p,n,n+p)(P=1,2)是强优美树
20
作者 程辉 《西北师范大学学报(自然科学版)》 CAS 1994年第4期24-26,共3页
引入强优美树概念,证明了三星体R_[(n-p),n,n+p](n为自然数;p=1.2)是强优美树,从而得到四星体R_[(n-p),n,n+p,m](m,n为自然数;p=1,2)是优美树的结果。
关键词 三星体 四星体 优美树 强优美树
下载PDF
上一页 1 2 95 下一页 到第
使用帮助 返回顶部