Stability Analysis of Continuous-Time Fuzzy Large-Scale System

IntroductionSincefuzzylogicwasintroducedintotheanalysisanddesignofcontrolsystemsbyZadehin 1 96 5[1] ,ithasbecomeaverypopulartopicincontrolengineering[2 4] ,mainlybecauseofthefollowingtwopoints :1 )ithastheadvantagethatnoformalmathematicalmodelsisneededan…     

兔肾VX2移植瘤模型的建立及其超声显像检测

目的比较建立兔肾VX2移植瘤模型的不同方法的优劣。方法分别用瘤液穿刺法、瘤块液种植法、瘤块包埋法建立兔肾VX2癌模型。采用超声技术动态检测肿瘤体积及CDFI的变化,确定该模型最佳实验干预时段及其血流参数范围。比较各自的成瘤率;观测肾脏肿瘤的大小及其回声、瘤内血管生成以及血流阻抗等指标。结果瘤块包埋法可建立稳定的兔肾VX2移植瘤模型。B超可以实时、准确、方便的监测肿瘤体积及血流动力学变化。结论兔肾VX2移植瘤是一种造模方法简便且成瘤率高的肾癌动物模型,采用超声技术能精确、无创的动态监测肿瘤体积变化及血流特征。     

Clinical Detection and Feature Analysis on Neuro Signals

Research on neuro signals is challenging and significative in modern natural science. By clinical experiment, signals from three main nerves (median nerve, radial nerve and ulnar nerve) are successfully detected and recorded without any infection. Further analysis on their features under different movements, their mechanics and correlations in dominating actions are also performed. The original discovery and first-hand materials make it possible for developing practical neuro-prosthesis.     

周围性肺栓塞螺旋CT强化扫描肺密度测量的研究

目的　探讨螺旋CT平扫与强化扫描肺实质密度测量在周围性肺栓塞诊断中的作用。方法　 8只犬于DSA下复制为单侧周围性肺栓塞动物模型后进行螺旋CT平扫和强化扫描 ,根据DSA发现的栓塞肺动脉的位置 ,于螺旋CT平扫和强化扫描图像上分别测量栓塞区与对侧肺正常肺实质的CT值 ,比较双肺的CT值差异与净增CT值差异。结果　螺旋CT平扫栓塞区的CT值与对侧正常肺实质的CT值之间无明显差异 (P >0 .0 5 ) ;螺旋CT强化扫描显示栓塞区的CT值明显低于正常肺实质的CT值 (P <0 .0 1) ,而且栓塞区的净增CT值也明显低于正常肺实质的净增CT值 (P <0 .0 1)。结论　螺旋CT强化扫描可以发现周围性肺栓塞所致的低灌注区 ,是诊断周围性肺栓塞的重要间接征象     

香港公开大学的发展及给远程教育带来的思考

本文对处于国际教育技术前沿的香港远程开放大学在网络教育方面作一了解,探索其对远程教育带来的思考进行了探索,以期对国内开展更可行,更有效的网络课程,对远程教育的发展起到一定的借鉴作用.     

奉节长江大桥南桥头高边坡治理

重庆市奉节长江大桥地处齐曜山山脉构造带,断裂褶皱发育,地形陡峻,地质条件复杂,不良地质作用发育,南桥头交叉道口人工边坡高达140 m.经过多方案比较论证,采用了多种措施对边坡进行综合处治,变形监测结果表明治理后边坡处于稳定状态.     

农村客运站建设与管理模式的创新

针对目前农村客运站建设与管理中存在的客运站点建设跟不上发展、客运市场经营主体混乱等问题,提出合理安排农村客运站点布局的原则以及"站所合一"、"三定四统一"等管理模式,以扭转农村客运市场的混乱局面。     

单侧黑质纹状体通路损毁改变大鼠丘脑网状核神经元的电活动

目的观察单侧黑质纹状体通路损毁对大鼠丘脑网状核神经元电活动的影响。方法采用在体细胞外记录方法研究正常大鼠和帕金森病(Parkinson’s disease,PD)模型大鼠丘脑网状核(TRN)γ-氨基丁酸(GABA)能神经元放电频率和放电形式的变化。结果对照组和PD组大鼠TRN神经元的放电频率分别是(14.7±1.6)Hz(n=23)和(33.8±3.0)Hz(n=29),PD组大鼠TRN神经元的放电频率显著高于对照组(P<0.001)。在对照组大鼠,17%的神经元呈现不规则放电,83%为爆发式放电;而在PD组大鼠,具有规则、不规则和爆发式放电的神经元比例分别为7%、45%和48%,爆发式放电的神经元比例明显低于对照组(P<0.05)。结论单侧黑质纹状体通路损毁诱发大鼠TRN内GABA能神经元的放电频率增高,爆发式放电减少,这种变化可能与皮质-TRN兴奋性神经传递增强和苍白球-TRN抑制性神经传递减弱有关。     

COLOR AC-PDP ENHANCEMENT OF LOW LEVELS IMAGE QUALITY WITH DYNAMIC MODIFYING SUB-FIELDS CODE

Based on the ＂Grayscales average distribution＂ method which equally distributes the input gray levels to output gray levels, three improved methods named： ＂Reduce the gray range expressed by the less significant subfields＂, ＂Low levels preset＂ and ＂Modify the exponent of inverse-gamma function＂ are proposed in this paper. Using these methods, the inverse-gamma relation subfields code can be obtained easily which can improve the low level expressions of AC-PDP. And a program, ＂ gray scales distribution validate program＂, which can enhance the expressions of the demanded gray levels range, is also proposed in this paper.     

Geometrical design of blade＇s surface and boundary control of Navier-Stokes equations

In this article a new principle of geometric design for blade＇s surface of an impeller is provided. This is an optimal control problem for the boundary geometric shape of flow and the control variable is the surface of the blade. We give a minimal functional depending on the geometry of the blade＇s surface and such that the flow＇s loss achieves minimum. The existence of the solution of the optimal control problem is proved and the Euler-Lagrange equations for the surface of the blade are derived. In addition, under a new curvilinear coordinate system, the flow domain between the two blades becomes a fixed hexahedron, and the surface as a mapping from a bounded domain in R2 into R3 , is explicitly appearing in the objective functional. The Navier-Stokes equations, which include the mapping in their coefficients, can be computed by using operator splitting algorithm. Furthermore, derivatives of the solution of Navier- Stokes equations with respect to the mapping satisfy linearized Navier-Stokes equations which can be solved by using operator splitting algorithms too. Hence, a conjugate gradient method can be used to solve the optimal control problem.