2+1维非线性Schrdinger方程的显式解

通过选择适当的变换，求出了2＋1维SchrOdinger方程的一些新的显式解。     

Self-Expanded Clustering Algorithm Based on Density Units with Evaluation Feedback Section

This paper presents an effective clustering mode and a novel clustering result evaluating mode. Clustering mode has two limited integral parameters. Evaluating mode evaluates clustering results and gives each a mark. The higher mark the clustering result gains, the higher quality it has. By organizing two modes in different ways, we can build two clustering algorithms： SECDU（Self-Expanded Clustering Algorithm based on Density Units） and SECDUF（Self-Expanded Clustering Algorithm Based on Density Units with Evaluation Feedback Section）. SECDU enumerates all value pairs of two parameters of clustering mode to process data set repeatedly and evaluates every clustering result by evaluating mode. Then SECDU output the clustering result that has the highest evaluating mark among all the ones. By applying ＂hill-climbing algorithm＂, SECDUF improves clustering efficiency greatly. Data sets that have different distribution features can be well adapted to both algorithms. SECDU and SECDUF can output high-quality clustering results. SECDUF tunes parameters of clustering mode automatically and no man＇s action involves through the whole process. In addition, SECDUF has a high clustering performance.     

RLC串联谐振实验的直观教学法

传统的RLC串联谐振实验方法需用晶体管毫伏表大量测量数据，实验方法繁琐且没有直观性，在实验过程中不便于分析和讨论。本介绍一种新型实验方法，该方法可以克服上述不足之处，对学习掌握这部分内容起到了很好的作用。     

基于数字差动组合式测量法的微摩擦性能测试

在微观领域的滑动摩擦性能测量中，基于一种新的数字差动式测量原理，利用顺、逆时针时独立测量出的拉力，在计算时使这两个测量结果相减，从而使测量过程中的各种等值误差相互抵消．因此，在理论上消除了这些测量误差对最终结果的影响．在实际应用中，该原理能明显减少温度漂移等误差因素对测量结果的影响，显著提高测量系统的重复性．     

CNX薄膜的PCVD制备及研究

ＣＮＸ薄膜是一种新型的超硬膜。我们用等离子增强化学气相淀积法，制备了含氮量的２１ａｔ％的ＣＮＸ膜，并用俄歇电子探针，红外谱仪和拉曼光谱仪及Ｘ光衍射仪对其结构进行了研究。结果表明膜听屡元素主要以Ｃ≡Ｎ，Ｃ＝Ｂ，Ｃ－Ｎ键的形成与碳结合。     

阿根廷的金融危机与资本外逃

阿根廷是美国赞扬的金融自由化典范,银行证券业向外资开放的力度大,但其爆发金融危机造成的破坏也格外严重。阿根廷金融危机与经济全球化进程,特别是与金融开放和资本市场自由化密切相关。阿根廷吸引跨国银行投资,对本国金融体系的稳定造成了极其恶劣的影响,资本外逃给民众存款造成了重大损失。中国应积极吸取阿根廷的教训,慎重对待外资收购、兼并和MBO,特别是"入世"后银行证券业的开放,更好地维护本国经济金融安全,防范风险。     

Isolation,purification and characterization of a new organphosphorus hydrolase OPHC2

A bacterium with the capability of degrading organphosphorus, identified as Pseudomonas pseudoaicaligenes, is isolated from OP-treated soil. The organphosphorus hydrolase OPHC2 from this bacterium has been purified and characterized. OPHC2 has optimum activity for the reaction at 65℃ and pH 9.0 with methyl parathion as a substrate, it also shows good thermal and pH stability. Most metal ions and chemicals have no effect on the activity of OPHC2. The analyses of nucleotide sequence encoding OPHC2 and amino acid sequence of OPHC2 show that there are lower homologies with those of organphosphorus hydrolase reported in GenBank.     

基于GIS的甘肃省道路网络评价

阐述了道路的网络评价指标体系和方法,并以甘肃省交通道路网为基础,在GIS技术的支持下,利用ArcView GIS、MapObjects和Visual Basic等进行了甘肃省分县道路网络的评价研究．结果表明,甘肃省道路网络存在聚团现象,存在以兰州市、天水市秦城区和庆阳地区西峰市为中心的道路可达性指标高值区,以及以玉门市为中心的一个高值带状区域．     

Epigenetic inactivation of SFRP genes allows constitutive WNT signaling in colorectal cancer

Aberrant WNT pathway signaling is an early progression event in 90% of colorectal cancers. It occurs through mutations mainly of APC and less often of CTNNB1 (encoding beta-catenin) or AXIN2 (encoding axin-2, also known as conductin). These mutations allow ligand-independent WNT signaling that culminates in abnormal accumulation of free beta-catenin in the nucleus. We previously identified frequent promoter hypermethylation and gene silencing of the genes encoding secreted frizzled-related proteins (SFRPs) in colorectal cancer. SFRPs possess a domain similar to one in the WNT-receptor frizzled proteins and can inhibit WNT receptor binding to downregulate pathway signaling during development. Here we show that restoration of SFRP function in colorectal cancer cells attenuates WNT signaling even in the presence of downstream mutations. We also show that the epigenetic loss of SFRP function occurs early in colorectal cancer progression and may thus provide constitutive WNT signaling that is required to complement downstream mutations in the evolution of colorectal cancer.     

面向对象技术在流域洪水预报系统中的应用

通过对现有的洪水预报系统的分析,确定了复用率低以及难于扩展是目前洪水预报应用系统在实现方面存在的普遍问题。利用面向对象的Java语言作为开发工具,进行洪水预报应用系统的开发,使系统具有较强的可扩展性和复用能力,能有效地缩短新系统的开发周期,因而是进行洪水预报系统开发的有效工具。