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encumber with
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     Down of US economy unable to encumber China
     美国经济衰退不可能拖累中国
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     Environmental hormone disturb the mechanism of internal secretion, make it malajustment, encumber the procreation of organism or bring the malignancy.
     环境激素干扰内分泌代谢机制,造成内分泌失调,可能阻碍生物体生殖功能或引发恶性肿瘤;
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     In contrast, preference for wealth is not necessarily associated with activities that stimulate economic growth, in fact, in most cases it encumber the economic development.
     反之,对财富的偏好却不一定会刺激经济增长,事实上,在大多数情形下,它会阻碍经济的发展。
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     The influce of solvent and pH is investigated. The result shows that the strong polar solvent or the solvent which is easy to form hydrogen bond with alcohol and alkalescency media can encumber the dehydration reaction.
     考察了溶剂和酸碱性对氢解反应的影响 ,发现强极性溶剂、易与醇形成氢键的溶剂以及碱性介质均不利于氢解反应
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The quick trafficking of concrete pavements is always encumbered with the conventional long curing process of the concrete. In the paper, the possibility of the puick trafficking of concrete pavements is demonstrated with several measures taken including its practicability and economic aspects, and etc.

水泥混凝土路面通常需要有一段养生时间,因而待开放交通的时间较长.本文论述水泥混凝土路面摊铺后快速开放交通的可行性;讨论快速开放交通所需要采取的措施;快通混凝土铺路的实用性、经济性和一些其它有关问题.

Objestive The aim of the present study was to evaluate the use of measurements of color Doppler jet area, three dimensional (3D) jet volume and 3D flow convergence region as methods for assessing the possiblity and accuracy of 3D reconstruction of a more complex flow situation: pulsative flow through a simulated flail mitral valve(FMV). Methods: Four different flows (10, 20, 40 and 60 ml/beat) were driven into a previously described flow model using a Harvard Pulsative Blood Pump model. The flow was driven...

Objestive The aim of the present study was to evaluate the use of measurements of color Doppler jet area, three dimensional (3D) jet volume and 3D flow convergence region as methods for assessing the possiblity and accuracy of 3D reconstruction of a more complex flow situation: pulsative flow through a simulated flail mitral valve(FMV). Methods: Four different flows (10, 20, 40 and 60 ml/beat) were driven into a previously described flow model using a Harvard Pulsative Blood Pump model. The flow was driven through a disk simulating a flail orifice valve. The cross sectional area of the regurgitant orifice was 0.24 cm 2. The flow convergence towards the orifice and the regurgitant jet were imaged using an ATL/Interspec ultrasound system (Apogee RX 800). The 3D was acquired using a rotation scan strategy with the transducer mounted on a mechanical arm and rotated from 0° to 180°. Under control of a TomTec computer, two dimensional (2D) ultrasound images were recorded on 0.5 inch video tape simultaneously with the rotational acquisition. Results: The correlation between the maximal jet area and the regurgitant volume/beat, the maximal volumetric flow rate were moderate ( r =0.69, SEE=2.2 cm 2, P <0.05; r =0.62, SEE=2.5 cm 2, P <0.05; r =0.71 respectively). A close correlation was found between the 3D reconstruction of the maximal regurgitant jet volume and the maximal volumetric flow rate ( r =0.96, SEE=7.6 ml, P <0.05). Similar results were found when the jet volume was compared to the regurgitant volume/beat and the driving velocity ( r =0.94, SEE=8.4 ml, P <0.01). There was a significant correlation between the volume of the flow convergence and the regurgitant volume/beat, the maximal volumetric flow rate ( r =0.89, SEE=0.22 ml, P <0.01). Conclusion: The result of the 3D reconstruction of regurgitant jet are superior to 2D maximal jet areas. However, 3D reconstruction of flow event are encumbered with the limitation of 2D Color Doppler i. e, gain settings. Central jets versus jets adjacent to walls and Nyquist limits. Measurement from a 3D reconstructed flow convergence region may be superior to measurements from 2D Color Doppler recordings to calculate volume flow of a more complex flow situation.

本研究采用体外血流模型,模拟连枷样二尖瓣(FMV)口返流,应用常规彩色多普勒血流显像(CDFI)的返流面积与射流和血流会聚区的三维(3D)超声重建及实际返流量进行对比研究,评价更复杂的血流(脉冲血流通过FMV)状态3D重建的可行性和准确性。被驱动的血流通过一个模拟FMV口,返流口的截面积为0.24cm2。仪器使用ATL,InterspecApogee800彩色多普勒超声仪,探头附着在一种机械臂上,在TomTec计算机控制下进行0°~180°的旋转扫描获得射流和血流会聚区3D重建的数据。同时磁带记录CDFI图像待后分析。结果显示:CDFIFMV的返流面积与实际返流容积和最大返流量呈中等相关(r=0.69,SEE=2.2cm2,P<0.05和r=0.62,SEE=2.5cm2,P<0.05)。3D重建后的返流容积与实际返流容积和最大返流量相关良好(r=0.96,SEE=7.6ml,P<0.05和r=0.94,SEE=8.4ml,P<0.01)。血流会聚区3D重建与实际返流容积相关较好(r=0.89,SEE=0.22ml,P<0.01)。结论:3D重建可减低CDFI的某些限制,如增益、贴壁返流和混叠速度等,特别是?

In this article, the authors discussed three problems in the country of Heilongjiang Province.First,the basic democracy construction is still to be enhanced.The authors especially elaborated upon the causes of lack of promotion of the Organization Law of Villagers' Committees.Second,The debt problem is getting grave with rural collectives.Third,Peasants are stilled heavily encumbered with burdens.

黑龙江省农村当前存在三个重要问题 :农村的基层民主建设还需大力加强 ,作者特别谈到了《村民委员会组织法》没有得到宣传的原因 ;乡村集体的负债问题相当严峻 ;农民负担依然过重

 
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