关于丢番图方程x3±53=3py2

设P为奇素数,运用同余式、平方剩余、乐让德符号的性质等初等方法得出了丢番图方程x^3±5^3=3py^2无正整数解的两个充分条件．     

混凝土结构耐久性研究的复杂系统方法

在侵蚀环境下混凝土耐久性研究成果的基础上,从系统学的角度出发,描述了耐久性研究的复杂性特点,剖析和揭示了耐久性复杂系统的本质,论述了耐久性系统是一个开放的复杂巨系统.基于耐久性复杂性的本质,得出处理耐久性复杂系统问题应该采用综合集成方法.     

生物有机肥料对落叶松、沙棘育苗地土壤微生态环境的影响研究

在落叶松、沙棘育苗地施用生物有机肥料,以改善其土壤微生态环境,提高落叶松、沙棘育苗成活率,加快落叶松、沙棘苗的生长．试验结果表明：生物有机肥料可以提高红松育苗地的微生物数量,改善pH值、有机质及速效N,P,K等微生态指标,促进落叶松苗和沙棘苗的生长．     

Breast cancer stem cell: the roles and therapeutic implications

Breast cancers have been increasingly recognized as malignancies displaying frequent inter- and intra-tumor heterogeneity. This heterogeneity is represented by diverse subtypes and complexity within tumors, and impinges on response to therapy, metastasis, and prognosis. Cancer stem cells (CSCs), a subpopulation of cancer cells endowed with self-renewal and differentiation capacity, have been suggested to contribute to tumor heterogeneity. The CSC concept posits a hierarchical organization of tumors, at the apex of which are stem cells that drive tumor initiation, progression, and recurrence. In breast cancer, CSCs have been proposed to contribute to malignant progression, suggesting that targeting breast cancer stem cells (BCSCs) may improve treatment efficacy. Currently, several markers have been reported to identify BCSCs. However, there is objective variability with respect to the frequency and phenotype of BCSCs among different breast cancer cell lines and patients, and the regulatory mechanisms of BCSCs remain unclear. In this review, we summarize current literature about the diversity of BCSC markers, the roles of BCSCs in tumor development, and the regulatory mechanisms of BCSCs. We also highlight the most recent advances in BCSC targeting therapies and the challenges in translating the knowledge into clinical practice.     

浅论愚公移山精神在中国共产党精神谱系中的地位和作用

革命精神是党和国家的宝贵财富,愚公移山精神在中国共产党精神谱系中承前启后,为我们党不断开拓创新提供丰厚滋养.它是延安精神集大成者,吹响了新民主主义革命新阶段的集结号,党团结和带领各族人民不断从胜利走向胜利;它是建国后披荆斩棘、艰苦奋斗的精神原点,新中国成立后产生的系列创业精神,丰富了中国精神宝库;它是实现中国梦的动力源...     

Modeling the Spatial-temporal Characteristics of Mutual Funds' Herd Behavior

Herd behavior in financial markets often leads to unjustified macroscopic phenomena.However,despite existing studies on modeling herd behavior,how it varies acr...     

金融危机下江西酒店业的发展现状及对策

2008年下半年以来,旷日持久的美国次贷危机已转化为严峻的世纪性金融危机。严重的金融危机使得与经济水平密切相关的酒店业面临着前所未有的挑战。但是江西酒店业却表现出以下特点：星级酒店出租率下降,经济型酒店逆势发展,酒店业的投资增加;本文深入分析了江西酒店业在危机中面临的机遇和挑战,并在此基础上探讨了应对金融危机的策略。     

对田径类课程教学模式的创新研究

根据教育部的相关文件精神,实施田径类课程教学改革创新势在必行.本文通过大量的文件、资料的分析和多年的教学实践经验的总结,研究和确立了高等学校体育专业田径类课程教学创新模式,以适应新形势下的教学需要.     

影响中国区域入境旅游竞争力的主要因素分析

分析了改革开放以来我国整体入境旅游的总体特征,利用主成分分析对影响区域旅游的因素进行提取,根据主成分分析的结果,确定影响区域入境旅游的主要因素,据此探讨提高区域入境旅游竞争力的对策.     

A 60 000-year loess-paleosol record of millennial-scale summer monsoon instability from Lanzhou, China

The 28-m high-resolution Shajinping loess section in Lanzhou on the Chinese western Loess Plateau records a detailed history of millennial Asian summer monsoon change since the earlier last glaciation. Summer monsoon proxies of soil magnetic susceptibility, carbonate content and soil color show that Asian summer monsoon experienced a series of rapid episodic pulse enhancements spanning only ca. 1-2 ka and have sub-Milankovitch cycles of progressive weakening in low frequency domain since ca. 60 kaBP. Soil formation responds to these by deepening colors, accumulating organic matter, increasing biological channels and leaching certain carbonates. The pedogenic degree generally increases with the degree of enhancement of summer monsoon. These may reflect the impact of the last glacial fast climatic change in the North Atlantic region on Asian summer monsoon.