无负荷试验与脐血流测定评估妊娠期肝内胆汁淤积症患者围生儿预后

目的:探讨脐动脉血流速度测定及无负荷试验评估妊娠期肝内胆汁淤积症(intrahepatic cholestasis of pregnancy,ICP)患者围生儿预后的应用价值。方法:联合应用胎心无负荷试验及多普勒测定脐动脉血流速度,对71例ICP患者(ICP组)及60例正常孕妇(对照组)进行观察。结果:ICP组收缩期末和舒张期末峰值比(S/D)与无负荷试验异常发生率均高于对照组(P<0.05),ICP组的S/D和无负荷试验结果异常的围生儿预后不良发生率明显高于结果正常组(P<0.005)。结论:ICP患者应常规进行S/D测定及无负荷试验,以便及时处理改善围生儿预后。

初中数学教学中如何做好学困生转化工作

全面推行素质教育，大面积提高教育教学质量，是每一个教师努力追求的目标。学困生教育转化问题，一直是学校、教师和家长心中的一大难题。它影响着教学质量的提高，也直接关系着素质教育的实施。因此，基于这种情况，在新课改下如何寻求科学的对策，有效地帮助数学学习困难生摆脱困境，是提高数学整体教学水平的一大关键问题，也是目前初中数学教师不能回避的重大课题。

Proper Particle Size Range for Resistance to Chemical Oxidation: A Perspective on the Recalcitrance of Beanpod Biochar for Soil Carbon Sequestration

The effect of particle size on the recalcitrance of biochar against oxidation has been regarded as one of the most important factors influencing its stability and transportation in soils. Little is known about the peculiar stability of different particle sizes under chemical oxidation conditions. In this study, several sizes of biochar particles derived from beanpod were produced,and their stabilities were tested by using acid dichromate and hydrogen peroxide. We discovered that the 60-100 mesh size of particles produced at 400 and 500 ℃ showed the least carbon loss under the oxidation of both dichromate and hydrogen peroxide. In addition, this particle size also shows great stability at 600 and 700 ℃, but this stability was not observed below 300 °C for all temperature-dependent biochars. Medium-sized particles composed of exclusively heterogeneous components produced a biochar at temperatures over 400 ℃ with comparatively stronger chemical anti-oxidation characteristics. The chemical recalcitrance of biochar should be reevaluated based on particle size before soil application.

How to Conduct Emotional Education Analysis in College English Teaching

The so-called emotional education is the education of cultivating students＇ social emotion, promoting their self-control ability and promoting students to correctly cope with the relationship between themselves and surrounding environment. In college English teaching, implementing emotional education not only can teach knowledge to students, but also can help others to form perfect personality, to promote all-round development of students. However, fi＇om the present situation, in college English teaching, it generally exists ＂focusing more on knowledge and less on emotion＂ phenomenon, which doesn＇t conform to the requirement of quality education. In college English teaching, conducting emotional education is necessary and imminent.

Division and integration tendency of college students＇ political socialization

the political socialization of college students is the purpose of the individual to accept political culture in the historical, social, cultural and the specific interaction, formation of political attitude, the practice process of shaping the political people. Our country is in the period of social transition, this period of transformation of political, economic and cultural construction of the China different from traditional political culture atmosphere, in the impact of the global political factors, college students＇ political psychology, political attitude and political behavior has undergone a series of changes. These changes impact on the existing college students＇ political socialization outcomes, so that students show the political and social highlights issues in the process of social transformation. In this case,we should only study the college students＇ optimization approach of political socialization carefully, improve the level of Chinese college students＇ political socialization, to ensure China＇ s social transition in a stable order smoothly, develop socialist political requirements of qualified university students, so as to make the socialism prosperous.

Median sternotomy closure:review and update research

Cardiac surgery is a very common operation nowadays all over the world.Median sternotomy is a routine procedure required for cardiac access during open heart surgery.The complications of this procedure after the cardiac surgery range from 0.7% to 1.5% of all cases,and bear a high mortality rate if they occur.Every individual surgeon must pay great attention on every detail during the sternal closure.This article shows the details as to conventional information and updated progress on median sternotomy closure.The update contents involve in biomechanics,number of wires twists,biomaterial and so on.According to our experience,we recommend four peristernal single/double steel wires for sternal closure as our optimal choice.

Investigation of Essential or Non-essential Character of Some Hardly Known Trace Elements for Plants

The concentration distribution of essential and non-essential micro-elements of the tissues of healthy organisms shows significant difference. This fact can be used for clarification of the biological role of hardly known trace elements, as well, proving the essential or non-essential character. In case of essential elements the concentration range is rather narrow, the distribution is normal. In case of non-essential elements the interval is wide, the concentration-distribution is log-normal. Measurements and mathematical calculations were carried out for determination of the concentrations and concentration-distributions of some micro-elements, trying to clarify the essentiality or non-essential character of the investigated elements from point of view of plant physiology. Based on the measurements for radish Li and Ni seem to be non-essential trace elements, however in case of Sr the distribution curve suggests an essential character, because the concentration range is not wide.

The biomechanical study of lower limb during human walking

The coordinates of the marked points of joints and the changes of foot force in the human walk motion are obtained with systems of motion image acquisition and force measuring.The effects of kinematics and dynamics on the human lower limb in different loads(0,10,20,30 kg) and walking speeds(0.8,1.3,1.7 m/s) have been investigated using the human dynamics model,.The results were as follows.First,with the increasing load,the dorsiflexion angle of ankle joint increased during the procedure of toe-off,the range of motion of the knee joint decreased,the flexion angle of the hip joint increased,and oppositely,the extension angle of the hip joint decreased.Second,with the increasing speed,the range of motion of the ankle joint,the maximum flexion angle of the knee joint,the flexion angle,extension angle of the hip joint and the range of motion of hip joint increased.Finally,the torque and power of the ankle joint,the knee joint and the hip joint increased with the increasing speed and load.The results can provide an important basis for the mechanism design of lower limb power-assisted exoskeleton.