我国优秀老年气排球运动员运动损伤调查分析

对我国31支老年气排球队的106名男女优秀气排球队运动员进行问卷调查，结果发现：男子运动损伤发生率为93．9％，女子运动损伤发生率为75．0％，损伤率与肌肉力量不足、准备活动不充分等因素有关。最常见的损伤部位是膝关节，踝关节、肩关节、腰背部、腕关节、小腿、肘、足、骨盆损伤也比较多见。结合老年气排球运动的特点就导致损伤的原因进行了分析。并提出了预防建议。     

SE-12m毛细柱在馏分含萘测定中的应用

本文选用长12米的毛细柱对煤焦油馏分中萘的测定进行了研究,实验结果表明,采用该毛细管柱具有分离效果好,结果准确,重现性好,分析时间短等特点,可替换填充柱,同时也为短毛细柱在分析中的应用提供了参考。     

Modeling of mass transfer characteristics of bubble column reactor with surfactant present

INTRODUCTION mass transfer coefficient, kLa, which depends fun- damentally on the superficial gas velocity and on Bubble columns are widely used in the the physical properties of the absorption phase.chemical industry where heterogeneous gas-liquid Numerous correlations have been proposed for theor gas-solid reacti…     

Solid-phase microextraction for flavor analysis in Harari Khat (<Emphasis Type="Italic">Catha edulis</Emphasis>) stimulant

This research examined the typical flavor compounds in the commonest type of Khat called Harari Khat grown in the region of Ethiopia. Twenty-eight compounds, which includes 1,2-Propanedione, 1-Phenyl, Hexanol, Hexanal compounds, Limonene, Benzaldehyde with other flavors, were extracted by polydimethylsiloxane at room temperature for 30 min from Khat samples, and identified by solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). This method needs no organic solvents and required minimal sample. Project supported by scholarship from China     

离子色谱法测定中药当归中的无机阴离子成分研究

以流速0.8ml·min-1,3.2mmol·L-1Na2CO3和1.0mmol·L-1NaHCO3混合液为流动相,在ASUPPA5-250型阴离子分离柱上分离,采用带电导检测器的离子色谱仪对中药当归中六种阴离子进行分离测定,该方法具有良好的线性,相关系数为0.9987-0.9998,RSD<1.92%。     

海洋油气工程专业英语互动式教学方法研究

在实际海洋油气工程专业英语教学中依然面临着一些问题,学生对专业英语学习的积极性不高,在教学过程中没有明确学习的目的,种种不良因素都严重阻碍了其专业英语能力的提升。因此,文章将围绕海洋油气工程专业英语互动式教学方法展开分析,通过详细介绍互动式教学方法在海洋油气工程专业英语应用的可行性来更好地处理当前存在的不良问题,实现学生专业英语能力的显著提升。     

Selection environments, flexibility and the success of the gas turbine

This paper explains the success and failure of two technologies for electricity generation. Both the combined cycle gas turbine (CCGT) and fluidised bed boiler burn fossil fuels more cleanly than more traditional technologies. Whereas the CCGT has been used for an increasing number of new power plants during the past 15 years, the fluidised bed has struggled to attract attention outside a small-scale niche. The paper examines economic, institutional and political changes in the selection environment for power plant technologies to explain this success and failure. It demonstrates how the technological flexibility of the CCGT allowed it to benefit from different selection environments to become the electricity industry's current technology of choice.     

An electricity price model with consideration to load and gas price effect

INTRODUCTIONInanelectricitymarket,theelectricitypriceshaveimportantimpactonsuchdiverseis suesasassetpricing ,contracting ,planning ,andchoiceofoperationpoliciesforgenerationandtransmissionofelectricity .Analysisofthehistor icalelectricitypricessuggestedth…     

气相色谱法测定面粉中过氧化苯甲酰

面粉中的过氧化苯甲酰经乙醚提取浓缩后,被碘化钾还原反应生成苯甲酸,利用气相色谱法对其进行分离测定,并与标准品比较定性、定量.该方法的最低检出含量为0.3 mg/kg,加标回收率在90%～99%之间.该方法分离效率高,样品用量少,检测灵敏度高.     

气相色谱-质谱法对柠檬酸三丁酯的检测研究

建立了GC—MS对柠檬酸三丁酯的定性与定量分析方法．全扫描方式定性,选择离子方式定量,外标法线性相关系数为0．994,方法回收率为91．0％～107．0％,相对标准偏差为5．23％～6．95％．