检索结果-南通市图书馆

A Time Series Observation of Chinese Children Undergoing Rigid Bronchoscopy for an Inhaled Foreign Body： 3149 Cases in 1991-2010

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2015年第4期128卷 504-509页

作者： Xu Zhang Wen-xian li yi-Rong Cai Department of Anesthesiology Eye and ENT Hospital Fudan University Shanghai 200031 China

Background：In China,tracheobronchial foreign body （TFB） aspiration,a major cause of emergency episode and accident death in children,remains a challenge for anesthetic ***,we share our experience and discuss the anesthetic consideration and management of patients with TFB ***：This was a single-institution retrospective study in children with an inhaled foreign body between 1991 and 2010 that focused on the complications following rigid bronchoscopy （RB）.Data including the clinical characteristics of patients and TFB,anesthetic method,and postoperative severe complications were analyzed by different ***：During the 20-year study period,the charts of 3149 patients who underwent RB for suspected inhaled TFB were *** were 2079 male and 1070 female patients （1.94：1）.A nut （84％） was the most commonly inhaled *** study revealed a 9％（n =284） overall rate of severe postoperative complications related to severe hypoxemia,laryngeal edema,complete laryngospasm,pneumothorax,total segmental atelectasis,and death with incidences of 3.2％,0.9％,1.3％,0.3％,0.3％,and 0.1％,*** rates of preoperative airway impairment,negative findings of TFB,and adverse postoperative events have been on the rise in the past 5 ***：The survey results confirmed that hypoxemia remains the most common postoperative complication in different *** controlled ventilation and spontaneous ventilation were effective during the RB extraction of the foreign body at our hospital in the modern technique *** active respiratory symptom was commonly seen in the groups with negative findings.

关键词： Complication Inhaled Foreign Body Rigid Bronchoscope

NUMERICAL STUDY ON AIR FLOW AROUND AN OPENING WITH LARGE EDDY SIMULATION

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2003年第6期15卷 45-48页

作者： Fan Hong-ming, Ren Hong-ze, li xian-ting, yi JiangDepartment of Building Science, Tsinghua University, Beijing 100084, China, e-mail:xting li @ *** Dept. of Building Sci. Tsinghua Univ. Beijing 100084 China

Jet characteristics of air supply opening in a ventilating or anair-conditioning system is primarily decided by the folw state in the duct connected to the *** is valuable to study the opening jet characteristics and the flow state in a duct. In thisstudy, the Large Eddy Simulation (LES) technique combined with the Tarlor-Galerkin Finite ElementMethod (FEM) in Computational Fluid Dynamics (CFD) was applied to the problem. The 3-D flow fieldsin ducts around air supply opening under typical conditions were investigated by numericalsimulation as well as experimental measurements. Numerical results agree well with the availableexperimental data. It indicates that the LES method is available under the conditions withcomplicated boundaries and inner accompanied by anisotropic large-scale eddies, and it is credibleto predict the jet deflection characteristics around an opening.

关键词： computational fluid dynamics (CFD) finite element method (FEM) large eddysimulation (LES)

Comparison of anti-bacterial activity of three types of di-O-caffeoylquinic acids in Lonicera japonica flowers based on microcalorimetry

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2014年第2期12卷 108-113页

作者： HAN Jin LV Qing-Yuan JIN Shi-ying ZHANG Tian-Tian JIN Shi-Xiao li xian-yi YUAN Hai-Long 302 Military Hospital of China Institute for Drug and Instrument Control Health Department GLD of PLA

The anti-bacterial activities of three types of di-O-caffeoylquinic acids(diCQAs) in Lonicera japonica flowers, a traditional Chinese medicine(TCM), on Bacillus shigae growth were investigated and compared by microcalorimetry. The three types of diCQAs were 3, 4-di-O-caffeoylquinic acid(3, 4-diCQA), 3, 5-di-O-caffeoylquinic acid(3, 5-diCQA), and 4, 5-di-O-caffeoylquinic acid(4, 5-diCQA). Some qualitative and quantitative information of the effects of the three diCQAs on metabolic power–time curves, growth rate constant k, maximum heat-output power Pm, and the generation time tG, total heat output Qt, and growth inhibitory ratio I of B. shigae were calculated. In accordance with a thermo-kinetic model, the corresponding quantitative relationships of k, Pm, Qt, I and c were established. Also, the half-inhibitory concentrations of the drugs(IC50) were obtained by quantitative analysis. Based on the quantity–activity relationships and the IC50 values, the sequence of inhibitory activity was 3, 5-diCQA > 4, 5-diCQA > 3, 4-diCQA. The results illustrate the possibility that the caffeoyl ester group at C-5 is the principal group that has a higher affinity for the bacterial cell, and that the intramolecular distance of the two caffeoyl ester groups also has an important influence on the anti-bacterial activities of the diCQAs.

关键词： di-O-caffeoylquinic acids Lonicera japonica Bacillus shigae Antibacterial activity Microcalorimetry

Modified Harn Authentication Key Exchange Scheme

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2000年第Z1期 75-77页

作者： li Zi-chen, li Zhong-xian, YANG yi-xian (Information Security Center, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China)

Recently, Harn proposed one digital signature scheme for Diffie-Hellman key exchange system. In this paper, we point out at first that there is a weakness in Harn’s system and then we propose two modified schemes to ... 详细信息

关键词： Digital signature Key exchange Cryptography

可倾瓦推力轴承润滑油膜静动特性计算的嵌套式二分法与应用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

船舶力学 2019年第2期23卷 142-151页

作者：李贤燚赵耀华中科技大学船舶与海洋工程学院武汉430074

在舰船推进轴系纵向振动特性分析中,可倾瓦推力轴承润滑油膜的动特性是轴系力传递和振动响应分析的重要环节。该文建立了润滑油膜特性分析的理论模型,以有限差分法为基础,提出了嵌套式二分法,数值求解了油膜静动特性,并分别得出了在轴... 详细信息

在舰船推进轴系纵向振动特性分析中,可倾瓦推力轴承润滑油膜的动特性是轴系力传递和振动响应分析的重要环节。该文建立了润滑油膜特性分析的理论模型,以有限差分法为基础,提出了嵌套式二分法,数值求解了油膜静动特性,并分别得出了在轴系载荷与转速独立和非独立的情况下,油膜动特性随转速的关系。解释了船舶推进轴系振动实验中,不同转速情况下,相应的频响函数幅值大小的变化规律。

关键词：嵌套式二分法可倾瓦推力轴承动压润滑油膜静动特性

Race Specificity of Major Rice Blast Resistance Genes to Magnaporthe grisea Isolates Collected from indica Rice in Guangdong, China

在线全文

学校读者我要写书评

暂无评论

Rice science 2008年第4期15卷 311-318页

作者： Jian-yuan YANG Shen CHEN lie-xian ZENG yi-long li Zhen CHEN Chuan-ying li Xiao-yuan ZHU Plant Protection Research Institute Guangdong Academy of Agricultural Sciences Guangzhou 510640 China

Race-specific resistance and field resistance of 30 rice blast resistance monogenic lines derived from different resources were evaluated. The spectra of resistance to 163 Magnaporthe grisea isolates collected from indica rice in Guangdong Province, China ranged from 0.6% to 89.6%. Most of the monogenic lines showed a narrow resistance spectrum and high susceptibility in rice blast area, whereas the lines with Pikh and Pi1(t) had the broad resistance spectra of 89.6% and 82.2% respectively, showing a high and stable blast resistance in fields. According to the cluster analysis of specific resistance to 163 blast isolates tested, the 30 monogenic lines were divided into 15 groups, and based on the principal factor analysis, nine kinds of race-specific resistance were identified. Pik, Piz5, Pi9 and Pish can be used as candidate resistance genes for rice breeding since their specific resistance differed from those of the backbone parents in Guangdong, China. Gene pyramiding of Pikh [or Pi1(t)], Pi9 (or Piz5) and Pish (or Pita2) will be effective to obtain broad-spectrum blast resistance in rice breeding program in Guangdong, China. The strategies for studying and application of rice blast resistance genes were discussed.

关键词： rice race-specific resistance rice blast Magnaporthe grisea field resistance resistance gene

Complicate dynamics of a 3D system of ODE with three negative Lyapunov exponents

在线全文

学校读者我要写书评

暂无评论

Complicate dynamics of a 3D system of ODE with three negativ...

The heteroclinic orbits and bifurcations for a new Shimizu-Morioka-like system

第十五届全国非线性振动暨第十二届全国非线性动力学和运动稳定性学术会议

作者：王海军 li xian-yi College of Mathematical Science Yangzhou University

After revisiting a general three dimensional three-scroll chaotic system,more rich dynamics hiding and not found previously of it are clearly *** more rigorous mathematical work,such as for the complete distribution and the local stability and bifurcation of its equilibrium points,and the dynamics at infinity,is mainly carried out in this ***,numerical simulations not only support all analytical results obtained,but also further illustrate other interesting dynamical behaviors,including two heteroclinic orbits to E and Eand their bifurcated chaotic attractors,infinite many degenerate heteroclinic cycles and two-scroll and three-scroll chaotic attractors near *** particular,a possible new mechanism behind the creation of three-scroll chaotic attractors is *** on it,some new three-scroll chaotic attractors are numerically found in the case of small f>*** results clearly show that the system deserves further detailed investigation in future work.

关键词： Pitchfork bifurcation Hopf bifurcation singularly degenerate heteroclinic cycle zero-Hopf bifurcation project Method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The heteroclinic orbits and bifurcations for a new Shimizu-M...

第十五届全国非线性振动暨第十二届全国非线性动力学和运动稳定性学术会议

作者：王海军 li xian-yi College of Mathematical Science Yangzhou University

This paper introduces a novel three dimensional autonomous differential system which is derived from Shimizu-Morioka *** the one hand,the rich local dynamics of it,*** distribution of equilibrium point,stability,Hopf bifurcation and so on,are *** the other hand,the nonexistence of homoclinic and existence of heteroclinic orbits of it is also rigorously studied under some certain parameters by the classic method--employing Lyapunov functional together with theωlimit set andαlimit *** particular,the local stability of the symmetrical equilibria yields the global stability of them.

关键词： Hopf bifurcation homoclinic and heteroclinic orbit invariant algebraic surface ω limit set and α limit set Shimizu-Morioka-like system

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

论辩证唯物主义的辩证逻辑基础与实践

系统科学学报 2022年第1期30卷 57-60,113页

作者：李先一中国人民大学马克思主义学院北京1000872

逻辑学是基础性学科,是思维规范性科学。我国《易经》等传统思想有发达的辩证逻辑思维,马克思继承自黑格尔的辩证法创立了辩证唯物主义,辩证唯物主义的逻辑基础是辩证逻辑。辩证逻辑是研究反映事物互补结构整体的思想形式结构与其规律... 详细信息

逻辑学是基础性学科,是思维规范性科学。我国《易经》等传统思想有发达的辩证逻辑思维,马克思继承自黑格尔的辩证法创立了辩证唯物主义,辩证唯物主义的逻辑基础是辩证逻辑。辩证逻辑是研究反映事物互补结构整体的思想形式结构与其规律的科学,要使辩证逻辑符号化、形式化、现代化。马克思主义中国化,在哲学上,也是辩证唯物主义与我国传统辩证逻辑思想相结合的过程。辩证逻辑可以为系统科学、系统哲学和人工智能等实践提供逻辑基础。

关键词：辩证逻辑辩证唯物主义马克思主义中国化系统科学系统哲学