东亚植物区系中若干双子叶植物的染色体新计数及其系统学和进化意义     

徐炳声  翁若芬  栗田子郎 《中国科学院研究生院学报》1994,32(5):411-418

本文报道了东亚植物区系中双子叶植物9个种的体细胞染色体新计数，其中6个是属的新计数，并对这些资料与有关的科或属在系统学和进化上的意义作了讨论。  相似文献   

基于VRML和Java的交互式虚拟产品设计     

翁蓉  廖小平 《中国科技信息》2007,(24):129-130

基于虚拟现实建模语言VRML和Java编程技术，将两者结合运用构建一个应用于数字科技馆中的交互式虚拟产品设计系统，使青少年可以通过互联网协同多人进行产品设计。  相似文献   

我国六省市服务业的区位分布与地区专业化   总被引：1，自引：0，他引：1  

黄雯  程大中 《中国软科学》2006,(11):60-73

本文在新经济地理学关于行业空间发展理论的基础上,选取了我国经济最发达的六个省市,即上海、山东、江苏、浙江和广东为研究样本,基于LQ指数、RCA指数和K-spec指数对其整体服务业及其分行业的区位分布与地区专业化状况进行研究,发现:(1)六省市在整体服务业方面的地区差异有扩大趋势,分行业来看,传统服务行业的省际差异在缩小,一些新兴的尤其是知识密集型的服务行业方面的省际差异呈现扩大趋势;(2)北京市和上海市的整体服务业以及分行业的地区专业程度都很高,而且集聚趋势也很明显;(3)江苏省和浙江省在大部分服务行业上的产业结构基本相同。  相似文献   

基于主题句相似度的标题党新闻鉴别技术研究     

王志超  翁楠  王宇 《现代图书情报技术》2011,(11):48-53

针对目前网络上的标题党新闻,提出一种标题党新闻自动识别的算法。通过分析新闻网页构成的特点,抽取出新闻标题和新闻正文;以句子关系矩阵为基础,提出一种以语句为单位的主题句抽取算法;根据句子相似度计算结果来进行判断。实验表明,本方法的识别精度可达到80%,是一种有效的方法。  相似文献   

Three-dimensional cellular focusing utilizing a combination of insulator-based and metallic dielectrophoresis     

Huang CT  Weng CH  Jen CP 《Biomicrofluidics》2011,5(4):44101-4410111

Particle focusing in microfluidic devices is a necessary step in medical applications, such as detection, sorting, counting, and flow cytometry. This study proposes a microdevice that combines insulator-based and metal-electrode dielectrophoresis for the three-dimensional focusing of biological cells. Four insulating structures, which form an X pattern, are employed to confine the electric field in a conducting solution, thereby creating localized field minima in the microchannel. These electrodes, 56-μm-wide at the top and bottom surfaces, are connected to one electric pole of the power source. The electrodes connected to the opposite pole, which are at the sides of the microchannel, have one of three patterns: planar, dual-planar, or three-dimensional. Therefore, low-electric-field regions at the center of the microchannel are generated to restrain the viable HeLa cells with negative dielectrophoretic response. The array of insulating structures aforementioned is used to enhance the performance of confinement. According to numerical simulations, three-dimensional electrodes exhibit the best focusing performance, followed by dual-planar and planar electrodes. Experimental results reveal that increasing the strength of the applied electric field or decreasing the inlet flow rate significantly enhances focusing performance. The smallest width of focusing is 17 μm for an applied voltage and an inlet flow rate of 35 V and 0.5 μl/min, respectively. The effect of the inlet flow rate on focusing is insignificant for an applied voltage of 35 V. The proposed design retains the advantages of insulator-based dielectrophoresis with a relatively low required voltage. Additionally, complicated flow controls are unnecessary for the three-dimensional focusing of cells.  相似文献   

Evaluation and simplification of risk factors in FIGO 2000 scoring system for gestational trophoblastic neoplasia: a 19-year retrospective analysis     

Weng  Yang  Liu  Yuanyuan  Benjoed  Chitapa  Wu  Xiaodong  Tang  Sangsang  Li  Xiao  Xie  Xing  Lu  Weiguo 《Journal of Zhejiang University. Science. B》2022,23(3):218-229

Objective

The International Federation of Gynecology and Obstetrics (FIGO) 2000 scoring system classifies gestational trophoblastic neoplasia (GTN) patients into low- and high-risk groups, so that single- or multi-agent chemotherapy can be administered accordingly. However, a number of FIGO-defined low-risk patients still exhibit resistance to single-agent regimens, and the risk factors currently adopted in the FIGO scoring system possess inequable values for predicting single-agent chemoresistance. The purpose of this study is therefore to evaluate the efficacy of risk factors in predicting single-agent chemoresistance and explore the feasibility of simplifying the FIGO 2000 scoring system for GTN.

Methods

The clinical data of 578 GTN patients who received chemotherapy between January 2000 and December 2018 were retrospectively reviewed. Univariate and multivariate logistic regression analyses were carried out to identify risk factors associated with single-agent chemoresistance in low-risk GTN patients. Then, simplified models were built and compared with the original FIGO 2000 scoring system.

Results

Among the eight FIGO risk factors, the univariate and multivariate analyses identified that pretreatment serum human chorionic gonadotropin (hCG) level and interval from antecedent pregnancy were consistently independent predictors for both first-line and subsequent single-agent chemoresistance. The simplified model with two independent factors showed a better performance in predicting single-agent chemoresistance than the model with the other four non-independent factors. However, the addition of other co-factors did improve the efficiency. Overall, simplified models can achieve favorable performance, but the original FIGO 2000 prognostic system still features the highest discrimination.

Conclusions

Pretreatment serum hCG level and interval from antecedent pregnancy were independent predictors for both first-line and subsequent single-agent chemoresistance, and they had greater weight than other non-independent factors in predicting single-agent chemoresistance. The simplified model composed of certain selected factors is a promising alternative to the original FIGO 2000 prognostic system, and it shows comparable performance.

  相似文献   

美国学前教育机构的家长开放政策及启示   总被引：1，自引：0，他引：1  

李生兰 《幼儿教育》2007,(10)

  相似文献   

关于体育后备人才试点中学目标及管理若干问题的研究   总被引：2，自引：0，他引：2  

翁焕明  金钦昌  黄一飞 《浙江体育科学》1993,(6)

一个国家要在竞技体育舞台上保持长盛不衰,就必须拥有一定数量的优秀体育后备人才,其关键是抓好课余运动训练。体育后备人才试点中学是学校体育改革的产物,它在抓好课余运动训练,培养高层次的体育后备人才中有其自身的优势和长处。本文在调查的基础上对体育后备人才试点中学的办学性质、培养目标、领导体制等问题作了研究、探讨。  相似文献   

传统武术发展的新思路--关于民族传统体育专业对传统武术人才招生改革的思考   总被引：18，自引：0，他引：18  

邱丕相  翁信辉 《体育文化导刊》2005,(5):54-56

传统武术是中国武术的根,是民族传统文化的载体.在高等院校中很有必要加以继承和发展.传统武术与竞技武术是武术蓬勃发展的两翼,应比翼齐飞,共同发展.民族传统体育专业对传统武术人才招生改革意义重大,不仅有利于武术学科的完善与发展,而且有利于传统武术的水平提高及科学化、学科化的发展.  相似文献   

面向MIS对象设计与浏览对象设计实例     

瓮正科  杨晋峰 《新疆职业大学学报》1994,(2)

本文首先从对象和类的基本概念出发,论述了面向MIS对象设计的主要内容,指出MIS系统实质上是对象类系统的结论。然后,给出了一个对象类--浏览对象类的具体程序。  相似文献