中国石竹科石头花属二新种     

鲁德全 《中国科学院研究生院学报》1993,31(6):565-568

 Gypsophila huashanensis Y. W. Tsui et D. Q. Lu and G. spinosa D. Q. Lu (Caryophyllaceae) are described as new from China.  相似文献   

Stability and dissipative analysis for a class of stochastic system with time-delay     

Hao Zhang  Huaicheng Yan 《Journal of The Franklin Institute》2010,347(5):882-3355

This paper deals with the stability and dissipative problem of a class of stochastic hybrid system. The system under study involves Markovian jump, impulsive effects and time delay, which are often encountered in practice and are the sources of instability. Our attention is focused on analysis of whether the stochastic hybrid system with time-delay is stochastically asymptotically stable and strictly (Q, S, R) dissipative. By introducing an extra artificial time instance, the equivalent system is obtained and the sufficient conditions are derived by using linear matrix inequality (LMI) techniques. The main results of this paper unify the existing results on H_∞ control.  相似文献   

第三代移动通信技术替代进程分析   总被引：5，自引：0，他引：5  

余江  方新 《科研管理》2002,23(3):14-19

第三代移动通信技术支持高速移动多媒体业务 ,全面突破了传统移动语音通信模式 ,将给社会经济生活带来重大影响 ,它的渐进性的技术替代进程既受到新技术本身实际性能改进程度的影响 ,又受到新技术替代旧技术成功程度的的示范效应影响 ,对技术替代进度可以从时间和空间维度两方面进行考虑 ,把握技术替代的节奏和重点  相似文献   

Serum adenosine deaminase, 5′ nucleotidase and malondialdehyde in acute infective hepatitis     

K. Pratibha  Usha Anand  Rajni Agarwal 《Indian journal of clinical biochemistry : IJCB》2004,19(2):128-131

Serum adenosine deaminase (ADA), 5′ nucleotidase (5′NT) and malondialdehyde (MDA) were estimated in patients with acute infective hepatitis (AIH) along with the routine parameters of liver disease. Present study is done to evaluate these special parameters in patients with clinical history of AIH and to assess the utility of these parameters as diagnostic/ prognostic indices of liver function and to correlate special parameters with routine live function tests (LFT). ADA, 5′NT and MDA along with routine LFT was estimated in 25 patients with AIH and 25 samples from healthy voluntary blood donars served as the control group. Routine LFT was estimated by standard clinical chemistry procedures on dade behring analyser and ADA, 5′NT and MDA were estimated by berthlot reaction, fiske and subbarao method and thiobarbituric acid method respectively. Statistical analysis showed that serum ADA, 5′NT and MDA were significantly higher in patients as compared with the controls. There was a significant positive correlation between ADA and total bilirubin and MDA and total bilirubin. Hence we can conclude that these tests would be more sensitive to diagnose the patients with AIH and that the raised bilirubin levels could be looked upon, as a protective mechanism which the liver has evolved in order to combat oxidative stress.  相似文献   

AQP-1和AQP-5在卵巢上皮性肿瘤的表达及临床意义     

杨建华  石一复  周彩云  王国萍 《科技通报》2006,22(6):781-784,791

目的探讨AQP1及AQP5在卵巢上皮性肿瘤的表达及临床意义。方法采用免疫组化法检测105例卵巢上皮性肿瘤和10例正常卵巢组织AQP1和AQP5蛋白的表达。结果AQP1主要表达于毛细血管及小血管内皮细胞．而AQP5表达于卵巢肿瘤细胞。随着卵巢上皮性肿瘤由良性向恶性发展，AQP1和AQP5的表达逐渐增加（P〈0．05）。Ⅲ、Ⅳ期卵巢癌AQP1的表达明显高于Ⅰ、Ⅱ期（P〈0．05），伴淋巴转移者AQP1明显高于无淋巴转移者（／9〈0．05）；腹水大于1000mL者AQP1和AQP5的表达明显高于小于1000mL者（P〈0．01）：低分化卵巢癌AQP5的表达明显高于高、中分化者（P〈0．05）；AQP1及AQP5的表达与腹水量呈正相关（r分别为0．40，0.31；P〈0．05）。结论AQP1和AQP5高表达与卵巢癌的发生、发展及预后有关，可能是卵巢癌腹水产生的主要原因。  相似文献   

Mixed control of uncertain jumping time-delay systems     

Magdi S. Mahmoud  Fouad M. AL-Sunni  Yan Shi   《Journal of The Franklin Institute》2008,345(5):536-552

In this paper, we investigate a class of linear continuous-time systems with Markovian jump parameters. An integral part of the system dynamics is a delayed state with time-varying and bounded delays. The jumping parameters are modeled as a continuous-time, discrete-state Markov process. Employing norm-bounded parametric uncertainties and utilizing the second-method of Lyapunov, we examine the problem of designing a mixed controller which minimizes a quadratic performance measure while satisfying a prescribed -norm bound on the closed-loop system. It is established that sufficient conditions for the existence of the mixed controller and the associated performance upper bound could be cast in the form of linear matrix inequalities.  相似文献   

固网运营商ICT业务转型的SWOT分析     

袁铭 《内江科技》2006,27(9):84-85

随着新技术的发展和移动通信对固定通信的替代,以中国电信和中国网通为主的固网运营商面临传统业务下滑的形式,另一方面随着技术进步而产生的通信技术与信息技术的融合又为固网运营商提供了新的发展机遇。本文以SWOT分析工具,对固网运营商ICT业务转型从优势、劣势以及潜在机遇、面临挑战四方面进行分析,并提出相关建议。  相似文献   

基础无机化学教科书中戊硼烷（B_5H_9）的结构研究     

陈经涛  张静  贾光峰  倪俊超  王建军  李飒英 《陕西教育学院学报》2011,27(1):88-92

硼烷因其分子结构的特殊性一直是无机化学研究的热点。五硼烷（B5H9）结构的讨论是研究硼烷分子结构特殊性的典型例证,但无机化学教科书中给出的五硼烷（B5H9）结构按照五种成键规律不能得到满意的解释;通过推导、计算和分析对五硼烷（B5H9）分子结构进行了比较详细的研究,给出了三种合理的五硼烷（B5H9）的分子结构,对分子中＂含有闭合式的五中心六电子（5c-6e）硼键＂的结构提出质疑,供各位同行在理论研究和教学中参考。  相似文献   

经尿道电切术加2.5％5-氟尿嘧啶局部灌注治疗男性尿道内尖锐湿疣     

刘志钢  ;欧阳诚军  ;林海岳  ;罗羿轩 《岳阳职工高等专科学校学报》2008,(3):98-99

目的：探讨经尿道电切术及2．5％5-氟尿嘧啶治疗尿道内尖锐湿疣的疗效及安全性。方法：对尿道内尖锐湿疣进行经尿道电切术加5-氟尿嘧啶局部灌注治疗。结果：治疗15例,治愈13例,尿道内复发2例。结论：经尿道电切术加2．5％氟尿嘧啶局部灌注治疗尿道内尖锐湿疣是一种安全有效的治疗方法。  相似文献   

移动新媒体阅读对图书馆发展影响     

张玲  周春宏 《环球赛鸽科技》2015,(17)

新媒体的应用推动了相关产业的发展;在媒体融合之势下,图书馆面临各种危机与挑战,传统用户的分流、阅读方式的改变、信息安全的挑战、人才的流失等;解决危机的应对策略包括：借助各种新媒体抓住“受众”,加快技术更新,实现图书馆转型,利用新媒体拓展信息服务模式等。  相似文献